JP2012167452A - Reinforcement structure and method for maintenance and repair of deteriorated sprayed mortar - Google Patents

Abstract

An object of the present invention is to improve the quality and function of a reinforcing bar insertion work and to improve the work efficiency of a surface protection work (mortar spraying work) in the maintenance repair method for aging mortar spraying.
SOLUTION: To maintain and repair an aging mortar spray (90), it is inserted into a hole (80) formed in an aging mortar spray (90) and a natural ground (100) and fixed by a grout. (10A, 10B, 10C), and a reinforcing rod-shaped body (11, 17) having a length over substantially the entire length of the hole, and one or more in the axial direction of the rod-shaped body (11, 17) Pressure means (13, 16) that surrounds and attaches the rod-shaped body (11, 17) at the position and is capable of forming a pressure surface facing the distal end side in the axial direction. Features.
[Selection] Figure 2

Description

  The present invention relates to a reinforcing structure used in a maintenance repair method for aging mortar spraying and a method for the same.

Conventionally, reinforcing bar insertion work and surface protection work (mortar spraying work) are used in maintenance repair work for aging mortar spraying.
FIG. 13: is a schematic sectional drawing of the natural ground which showed each process of the maintenance repair method of the conventional general aging mortar spraying. In (a), drilling holes 80 are formed in the aging mortar spray 90 and the ground 100. In (b), the grout 70 is injected into the hole 80. In this case, for example, the grout 70 is not injected under pressure unlike the ground anchor described in Patent Document 1, and the grout is injected under no pressure. In (c), a reinforcing material 110, which is generally a reinforcing bar, is inserted into the grout. In (d), head processing for fixing the base end portion of the reinforcing member 110 by a fixing means such as a nut is performed. Although not shown, a spacer is provided for positioning the reinforcing member 110 at the center of the hole.

  In another conventional example not shown, the grout may be injected by attaching an injection hose to the reinforcing material 110 instead of FIGS.

  Further, after fixing the reinforcing material, as shown in FIG. 13E, a mortar spraying work is performed as a surface protection work, and a new mortar spraying 91 is formed on the aging mortar spraying 90. In mortar spraying, reinforcing bars may be placed before mortar is sprayed.

  In addition, there are Patent Documents 2 and 3 as conventional examples of the maintenance repair method for aging mortar spraying.

Japanese Patent Publication No. 7-53976 Japanese Patent No. 2858082 Japanese Patent No. 3359588

  There are the following problems in the rebar insertion work that is performed for the maintenance and repair of aging mortar spraying.

  When grout is injected into the hole without applying pressure, it cannot be confirmed that the grout is completely filled. In addition, since there is no pressure, it is common to use the estimated value of the peripheral frictional resistance of the ground anchor formed by pressure injection reduced to 80%. Therefore, it is clear that if the pressure is applied, it is not necessary to reduce the peripheral frictional resistance.

  When the injection hose is attached to the reinforcing material and the grout is injected into the drilling hole, the grout is hardened in a state where the reinforcing material is arranged at a biased position instead of the center of the drilling hole because the hole diameter is small. On the other hand, even when the injection hose is not attached, when the reinforcing material with a conventional spacer (such as a thin metal plate) is carried in or inserted, it comes into contact with the slope due to an unstable construction environment such as a rope scaffolding on the slope. As a result, the position of the spacer is shifted or the spacer is deformed, so that the function of the spacer cannot be performed, and the reinforcing material cannot be positioned at the center of the hole. And even if the reinforcing material is deviated from the center position, it has to be applied as it is. If the reinforcing material deviates from the center position, it becomes impossible to secure the grout covering thickness necessary for the reinforcing material. As a result, there is a problem that the reinforcing material is easily corroded due to neutralization of the grout or groundwater.

  In addition, in the mortar spraying work as a surface protection work, when reinforcing the reinforcing bar before spraying the mortar, it is necessary to arrange the reinforcing bar according to the unevenness of the spraying surface for work on an unstable rope scaffold. Spend a lot of time. Furthermore, there is a problem that the amount of spraying increases when the reinforcing bars cannot be arranged according to the unevenness of the slope.

  The present invention realizes quality improvement and function improvement in reinforcing bar insertion work in the maintenance repair method for aging mortar spraying, and improves work efficiency in surface protection work (mortar spraying work) in the maintenance repair method for aging mortar spraying. It aims to be realized.

  In order to achieve the above object, the present invention provides the following configuration. The numbers in parentheses are reference numerals in the drawings described later, and are attached for reference.

  The reinforcing structure according to the present invention is inserted into the mortar spraying (90) and the drilling hole (80) formed in the ground (100) and fixed by grout for the maintenance repair of the aging mortar spraying (90). Reinforcing structure (10A, 10B, 10C), reinforcing rod-shaped body (11, 17) having a length over substantially the entire length of the hole, and axial direction of the rod-shaped body (11, 17) Pressure means (13, 16) attached to surround the rod-like body (11, 17) at one or a plurality of positions and capable of forming a pressure surface facing the distal end side in the axial direction; I have.

  In the first aspect of the reinforcing structure, the rod-shaped body is a solid rod-shaped body (11), and is coaxially disposed with a predetermined gap (d2) between the solid rod-shaped body (11). And a tubular body (12) extending to the proximal end side with respect to the pressurizing means, the pressurizing means being fixed to the distal end surface (12b) of the tubular body (12) and the distal end surface ( It is an annular pressure plate (13) having a larger diameter than 12b).

  In the second aspect of the reinforcing structure, the rod-shaped body is a hollow rod-shaped body (17), and is disposed coaxially with a predetermined gap (d2) between the hollow rod-shaped body (17) and It further includes a tubular body (12) extending to the proximal end side with respect to the pressurizing means, and the pressurizing means is fixed to the distal end surface (12b) of the tubular body (12) and the distal end surface (12b) The pressure plate (13) is an annular flat plate having a larger diameter than that of the pressure plate.

  In the first and second aspects of the above reinforcing structure, it is preferable that a plurality of holes (12a) are provided in the tube wall of the tubular body (12). In addition, it is preferable to have a plurality of elastic spacers (13d) projecting radially outward from the outer peripheral edge (13b) of the pressure plate (13).

  In the third aspect of the reinforcing structure, the rod-shaped body is a solid rod-shaped body (11), and the pressurizing means includes a first pressure plate member (16a) and a second pressure plate member (16b). ) In the axial direction, and the first pressure plate member (16a) is fixed to the solid rod-like body (11), and the first annular portion (16a1) A plurality of first spacer protrusions (16a2) projecting radially outward from the first annular portion, and the second pressure plate member (16b) is an axis of the solid rod-like body (11) A second annular portion (16b1), a plurality of second spacer projections (16b2) projecting radially outward from the second annular portion, and the second spacer projections (16b2) Leg portion (16b3) protruding in the axial direction from the first pressure plate member (16a) with respect to the first pressure plate member (16a). When the member (16b) rotates, the first and second spacer protrusions (16a2, 16b2) overlap each other when viewed from the axial direction, and the first and second spacers The protrusions (16a2, 16b2) are shifted from each other, and can be shifted between the pressing forms in which the pressing surfaces are formed.

  The maintenance repair method for aging mortar spraying according to the present invention is a construction method using the above-mentioned reinforcing structure (10A, 10B, 10C), in which mortar spraying (90) and ground (100) are drilled ( 80) and by inserting the reinforcing structure (10A, 10C) into the hole (80) after injecting the grout (70) into the entire hole (80), or The grout (70) is injected into the hole (80) after the entire reinforcing structure (10B) is inserted into the hole (80), whereby the pressurizing means formed in the pressurizing means is formed. And the pressure surface pressurizes the grout (70) on the tip side of the pressure surface.

  The first aspect of the maintenance and repair method of the above-mentioned aging mortar spraying uses the first aspect of the above-mentioned reinforcing structure, and drilling holes (80) in the aging mortar spraying (90) and ground (100) A step of injecting a grout (70) into the whole of the hole (80), and inserting the reinforcing structure (10A) into the hole (80), whereby the pressure plate (13) has a step of pressurizing the grout (70) on the tip side of the pressure plate (13).

  In the first aspect of the maintenance and repair method for aging mortar spraying, the pressure plate (13) passes through the entrance of the drilling hole while the reinforcing structure (10A) is inserted into the drilling hole (80). Immediately after the insertion, it is preferable to pause the insertion, inject the grout (70) into the gap (d2) between the solid rod-like body (11) and the tubular body (12), and then resume the insertion. is there. Further, when the reinforcing structure (10A) is inserted into the hole (80), at least one of the amount of grout (70) discharged from the hole (80) and the insertion speed is adjusted. Thus, it is preferable to control the internal pressure of the drilling hole (80). Furthermore, it is preferable to inject a secondary grout into the drilling hole (80) after the insertion of the reinforcing structure (10A) is completed.

  The second aspect of the maintenance and repair method for the aging mortar spraying uses the second aspect of the reinforcing structure (10B), and drills holes in the aging mortar spraying (90) and ground (100). A step of forming (80), a step of inserting the entire reinforcing structure (10B) into the drilling hole (80), and a grout through the hollow of the hollow rod-like body (17) of the reinforcing structure (10B). The pressure plate (13) pressurizes the grout (70) on the tip side of the pressure plate (13) by injecting (70) into the hole (80).

  In the second aspect of the maintenance and repair method for aging mortar spraying, when the grout (70) is injected into the hole (80) through the hollow of the hollow rod (17), the hollow rod ( It is preferable to control the internal pressure of the drilling hole (80) by adjusting the amount of grout (70) injected into the hollow of 17).

  The third aspect of the maintenance and repair method for aging mortar spraying uses the third aspect of the reinforcing structure (10C), and drills holes in the aging mortar spraying (90) and ground (100). Forming the step (80), injecting the grout (70) into the entire hole (80), and the pressure plate spacer (16) of the reinforcing structure (10C) as the non-pressurized form. The step of starting the insertion into the drilling hole (80) and moving the pressure plate spacer (16) to the pressure form by rotating the solid rod-like body (11) around the axis while inserting. And by further inserting the reinforcing structure (10C) into the drilling hole (80), the pressure plate spacer (16) in the pressurization form is grouting on the tip side of the pressure plate spacer. Pressurizing (70).

  In any one of the above maintenance and repair methods for spraying aging mortar, the grout (70) is injected into the hole (80) and the reinforcing structure (10A, 10B, 10C) is inserted into the hole (80). After completing both, after attaching a cross-shaped connecting reinforcing bar (20) to the base end of the reinforcing structure (10A, 10B, 10C), the base end of the reinforcing structure (10A, 10B, 10C) It is preferable to have a step of fixing the mortar and a step of forming a new mortar spray (91) by spraying the mortar on the aged mortar spray (90).

  The connecting reinforcing bar (20) used in the maintenance repair method for aging mortar spray according to the present invention includes two long reinforcing bar elements, and the two reinforcing bar elements are superposed so as to be orthogonal to each other in the longitudinal center portion. Each of the two reinforcing bar elements includes at least an even number of reinforcing bars arranged in parallel, and both ends of the even number of reinforcing bars are bent with respect to the central portion.

  The reinforcing structure used in the maintenance repair method for aging mortar spray according to the present invention is provided with one or a plurality of pressurizing means around a reinforcing rod-shaped body. When the maintenance repair method for aging mortar spraying is performed using such a reinforcing structure, the grout positioned on the tip side of the pressurizing means can be in a pressurized state.

  Also, by adjusting the amount of grout discharged from the hole or the amount of grout injected into the hole, or by adjusting the insertion speed of the reinforcing structure to be inserted into the hole, the internal pressure of the hole is adjusted. To control. As a result, a reinforcing structure superior in strength compared to the conventional one can be obtained, and the grout can be surely filled in the cavity and the crack in and around the hole.

  After inserting the reinforcing structure, attach a cross-shaped connecting bar to the base end of the reinforcing structure, fix the base end of the reinforcing structure, and spray new mortar on it to spray new mortar. As well as integrating aging mortar spraying, it exerts the role of slope work to transmit the tensile force generated in the rebar insertion work to the ground. In addition, the conventional work of arranging reinforcing bars in accordance with the unevenness of the slope becomes unnecessary.

It is a schematic sectional drawing of the maintenance repair method of the aging mortar spraying performed by applying the 1st Example of the reinforcement structure by this invention. In the construction method of FIG. 1, (a) is a partial cross-sectional view showing a step of inserting a reinforcing structure into a drilling hole, and (b) is a partial cross-sectional view showing a step of injecting a secondary grout. (A) is AA sectional drawing of FIG. 2, (b) is a schematic sectional side view of a reinforcement structure. (A) (b) is a figure similar to FIG. 3 (a) (b) which shows the modification of the reinforcement structure of a 1st Example. (A)-(f) is a schematic sectional drawing of the natural ground which showed each process of one Example of the maintenance repair method of aging mortar spraying using the reinforcement structure of a 1st Example. (A)-(g) is a schematic sectional drawing of the natural ground which showed each process of another Example of the maintenance repair method of aging mortar spraying using the reinforcement structure of the 1st Example. In the maintenance repair method of aging mortar spraying applied by applying the second embodiment of the reinforcing structure according to the present invention, (a) is a step of injecting grout into the drilling hole, (b) is a secondary grout. It is the schematic sectional drawing which showed the process to inject | pour. (A)-(f) is a schematic sectional drawing of the natural ground which showed each process of the maintenance repair method of aging mortar spraying using the reinforcement structure of the 2nd example. It is a schematic sectional drawing of the maintenance repair method of the aging mortar spraying performed by applying the 2nd Example of the reinforcement structure by this invention. (A) is a perspective view of a pressure plate spacer, (b) is a BB sectional view, (c) is a developed sectional view, and (d) is a sectional view in a state of being attached to a rod-shaped body. (A) is a plane development view and an overall plan view in the non-pressurized form of the pressure plate spacer, and (b) is a view similar to (a) in the pressurized form. (A) is sectional drawing explaining one Example of the head process performed after the completion of insertion of a reinforcement structure, (b) is a top view of the connection reinforcement shown to (a), (c) is the It is a side view. Furthermore, FIG.12 (d) is a top view of another Example of a connection reinforcing bar, (e) is the side view. (A)-(e) is a schematic sectional drawing of the natural ground which showed each process of the maintenance repair method of the conventional general aging mortar spraying.

Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples. In the drawings, components common to the respective embodiments are denoted by the same reference numerals.
The maintenance and repair method for aging mortar spraying according to the present invention includes a reinforcing structure insertion work in which a reinforcing structure is inserted into a natural ground and fixed by a grout, and a mortar spraying is applied to the surface of an aging mortar spraying after the reinforcing structure insertion work. It consists of surface protection work to be done. The reinforcing structure according to the present invention is used in place of the conventional reinforcing material, and the construction method using the reinforcing structure includes steps different from the conventional one.

(1) First embodiment of reinforcing structure and its construction method FIG. 1 is a schematic cross-sectional view of a maintenance repair method for aging mortar spraying applied by applying the reinforcing structure 10A of the first embodiment according to the present invention. It is. An old mortar spray 90 is attached to the surface 101 of the natural ground 100. The aging mortar spray 90 before the construction of this construction method has a crack or the like in itself, and the adhesion to the natural ground 100 is also reduced. Moreover, the back surface side may be eroded and the cavity 102 may arise.

  The reinforcing structure 10 </ b> A is inserted into the center of the grout 70 filled in the drilling hole 80 formed in the natural ground 100. Hereinafter, for the reinforcing structure 10A, the side that becomes the hole bottom side of the drilling hole 80 when inserted is referred to as the “front end side” in the axial direction, the opposite side is referred to as the “base end side”, and the vicinity of the base end side Is referred to as a “base end” (the same applies to other embodiments described later). The base end portion of the reinforcing structure 10A is fixed on the surface of the aged mortar spray 90, and a new mortar spray 91 is formed so as to cover this.

  2A is a partial cross-sectional view showing a step of inserting the reinforcing structure 10A into the hole 80 in the method of FIG. 1, and FIG. 2B is a partial cross-sectional view showing a step of injecting a secondary grout (black). Arrow indicates the direction of the grout). Before the step of FIG. 2A, the formation of the hole 80 and the injection of the grout 70 (primary grout) are completed. Fig.3 (a) is AA sectional drawing of FIG. 2, FIG.3 (b) is schematic sectional side view of 10 A of reinforcement structures. The reinforcing structure 10A will be described with reference to these drawings.

  The reinforcing structure 10A includes a solid bar 11 for reinforcement. The solid rod-like body 11 has a length that can be inserted into substantially the entire length of the hole 80. The tip of the solid rod-like body 11 is located in the vicinity of the hole bottom of the drilling hole 80. The solid rod-shaped body 11 is, for example, a reinforcing bar.

  At a predetermined intermediate position in the axial direction of the solid bar 11, an annular flat plate 13 is attached so as to surround the solid bar 11. As shown in FIG. 3, the pressure plate 13 has a circular inner peripheral edge 13a and an outer peripheral edge 13b. When the pressure plate 13 is attached around the solid rod-shaped body 11, a predetermined gap d <b> 1 exists between the solid rod-shaped body 11 and the inner peripheral edge 13 a of the pressure plate 13. The pressurizing plate 13 is a pressurizing unit for pressurizing the grout 70 in the hole 80. A surface 13 c facing the front end side of the pressure plate 13 is a pressure surface that presses the grout 70. The material of the pressure plate 13 is preferably made of steel, but may be made of plastic or iron.

  Furthermore, the reinforcing structure 10 </ b> A includes a tubular body 12 that extends to the base end side with respect to the pressure plate 13. The tubular body 12 is disposed coaxially with a predetermined gap d2 between the tubular body 12 and the solid rod-like body 11. The material of the tubular body 12 is preferably made of steel, but may be made of plastic or iron. As shown in FIG. 3B, the tube wall of the tubular body 12 is provided with a plurality of holes 12a. The position of the hole 12a is preferably in the vicinity of the pressure plate 13 (related to the step of FIG. 6D described later). Grout can pass between the inside and the periphery of the tubular body 12 through the hole 12a.

Hereinafter, a case where a reinforcing bar is used as the solid rod-like body 11 and a steel pipe is used as the tubular body 12 will be described as an example.
The pressure plate 13 is fixed by an appropriate fixing means so as to come into contact with the distal end surface 12 b of the steel pipe 12. In the illustrated example, the fixing means is three wedge-shaped fixing jigs 14 and is driven between the inner peripheral edge 13a of the pressure plate 13 and the reinforcing bar 11 at equal angular intervals as shown in FIG. Thereby, the reinforcing bar 11, the steel pipe 12, and the pressurizing plate 13 are integrated, and the reinforcing structure 10A is formed. Note that a gap d1 is secured between the adjacent fixing jigs 14. Grout can pass between the outside and inside of the steel pipe 12 through these gaps d1.

  As shown in FIGS. 3 (a) and 3 (b), the pressure plate 13 has a larger diameter than the distal end surface 12b of the steel pipe 12, and the outer peripheral edge 13b is in a position protruding outward in the radial direction. As shown in FIG. 3A, when the reinforcing structure 10A is inserted into the center of the hole 80, a predetermined gap d3 exists between the outer peripheral edge 13b of the pressure plate 13 and the inner wall of the hole 80. To do. The grout can also pass through the gap d3.

  When the reinforcing structure 10A is inserted at a predetermined speed, the grout on the distal end side with respect to the pressure plate 13 moves relative to the proximal end side with respect to the pressure plate 13 through the gap d3. At the same time, the grout on the tip side of the pressure plate 13 enters the inside of the steel pipe 12 (gap d2) from the gap d1 at the tip of the steel pipe 12, fills the inside of the steel pipe 12, and the excess grout is discharged from the hole 80. .

  When the reinforcing structure 10A is inserted at a sufficiently low speed, the capacity of the grout discharged from the drilling hole 80 should match the volume of the portion inserted into the drilling hole 80 in the reinforcing structure 10A. However, since the grout is actually viscous, resistance is generated when the reinforcing structure 10A is inserted at a certain speed or higher. This insertion resistance is further increased by the presence of the pressure plate 13. By forcibly inserting the reinforcing structure 10A against the insertion resistance, the grout on the tip side of the pressure plate 13 is in a pressurized state. This pressure is not so large in the case of manual construction, but a large pressure is obtained in the case of mechanical construction.

  As shown in FIG. 2A, an adjustment device 60 is attached to the proximal end portion of the reinforcing structure 10A. The attachment is performed before the insertion of the reinforcing structure 10A is started. The adjusting device 60 includes a discharge injection jig 61 capable of discharging and injecting grout and a discharge injection hose 64 connected thereto, and a pressure gauge 62 and an opening / closing valve 63 are provided in the middle of the discharge injection hose 64. It is attached. An exhaust valve 66 for discharging the air in the exhaust injection jig 61 is attached to the exhaust injection jig 61. The discharge injection jig 61 is connected to the proximal end side opening of the steel pipe 12. Although not shown, the adjusting device 60 may include a flow meter and an insertion resistance measuring instrument. Data of a measuring instrument such as the pressure gauge 62 is monitored manually or automatically, and a controller such as the on-off valve 63 is controlled manually or automatically. The adjustment device 60 can be used for both grouting and injection, but is used for grouting in the insertion process of the reinforcing structure 10A.

  In the insertion step, the internal pressure can be controlled by adjusting the grouting amount discharged through the inside of the steel pipe 12 by the opening / closing valve 63 while monitoring the internal pressure by the pressure gauge 62. Decreasing the discharge increases the internal pressure. Increasing the discharge reduces the internal pressure. The pressure of the grout discharged is the same as the internal pressure. Normally, insertion is performed by adjusting the open / close valve 63 so that the internal pressure becomes constant. When the on-off valve 63 is closed and the insertion is continued, the internal pressure rises and the pressurized state is maintained.

  In the insertion process, the internal pressure can be controlled by adjusting the insertion speed while monitoring the insertion resistance. Increasing the insertion speed increases the insertion resistance and increases the internal pressure. If the insertion speed is slowed, the insertion resistance decreases and the internal pressure decreases.

  Furthermore, in the insertion process, it is possible to estimate the state of cracks in the natural ground at the position where the pressure plate 13 passes by monitoring changes in internal pressure and insertion resistance. For example, when the inner wall of the drilling hole has cracks and the grout has escaped, the amount of loss changes when the pressure plate 13 passes through that position. As a result, the insertion resistance and the internal pressure change. In response to this, sufficient grout can be filled against the cracks by temporarily stopping the insertion at that position and supplying the grout. Thus, the presence or absence of cracks can be estimated, the accuracy of individual injection can be changed, and the injection amount and injection pressure suitable for the crack information can be set.

  As shown in FIG. 2B, after the insertion of the reinforcing structure 10A is completed, secondary grouting is performed. The adjusting device 60 at this time is used for grouting. Further, a water stop jig 65 is installed between the discharge injection jig 61 and the opening of the hole 80 to prevent the grout from being discharged from the hole 80. In this case, the amount of grout injected into the hole 80 can be adjusted by the adjusting device 60. When the secondary grout is injected into the inside of the steel pipe 12, it is supplied to the periphery and the tip of the steel pipe 12 through the hole 12a on the pipe wall of the steel pipe 12 and the gap d1 on the tip surface. A pressure state can be obtained. Moreover, the grout supplied to the peripheral part of the steel pipe 12 is inject | poured in a pressurized state also to the cavity 102 and surface layer ground of a spraying back surface. The state of injection into the cavity 102 can also be confirmed by a change in internal pressure.

  When the grout injection into the cavity 102 is completed and the grout is hardened, a reinforcing structure in which the reinforcing bar 11 is present in the steel pipe 12 filled with the grout is obtained, so that the structure is more rigid than the conventional reinforcing bar insertion work. Thereby, the displacement which generate | occur | produces in the reinforcing bar 11 is suppressed. Moreover, since the grout is restrained, the occurrence of cracks in the grout due to the movement of the natural ground 100 is also suppressed. Furthermore, when a crack is generated in the grout facing the inner wall of the hole 80 because the grout, the steel pipe 12, the grout, and the reinforcing bar 11 are configured in this order from the radially outer side to the inner side in the hole 80. In this case, the crack is blocked by the steel pipe 12 and does not reach the inner reinforcing bar 11. Moreover, the high rust prevention effect with respect to the reinforcing bar 11 can be expected by shielding with the steel pipe 12.

  Further, after the construction, the hollowing of the back of the spraying and the weathering of the ground on the back of the spraying progress, the mortar spraying and weathering layer that has deteriorated become unstable, and the reinforcing force of the present invention is also applied when the shearing force acts on the reinforcing bar 11. Since the reinforcement structure by a structure is a rigid structure conventionally, a deformation | transformation can be suppressed. Therefore, effects such as prevention of expansion of crack width generated in mortar spraying can be obtained, and progress of natural ground degradation due to infiltration of rainwater can be prevented.

  FIGS. 4A and 4B are views similar to FIGS. 3A and 3B, showing a modification of the reinforcing structure 10A. In this modification, elastic spacers 13d that protrude radially outward from a plurality of positions on the outer peripheral edge 13b of the pressure plate 13 are provided. The elastic spacer 13d is fixed to the pressure plate 13 so that no axial displacement occurs. The plurality of elastic spacers 13d are arranged at equiangular intervals on the outer peripheral edge 13b of the annular pressure plate 13. The plurality of elastic spacers 13 d have the same length in the radial direction, and serve as a spacer for positioning the reinforcing structure 10 at the center of the hole 80. That is, when the reinforcing structure 10 is positioned at the center of the hole 80, the length of the elastic spacer 13d is such that the tip of the elastic spacer 13d substantially reaches the inner wall of the hole 80. The material of the elastic spacer 13d is, for example, rubber. Since it is an elastic material, it does not hinder the work by being appropriately deformed at the time of carry-in or insertion, and returns to its original shape after insertion and functions as a spacer. Even if it is an elastic material, it has the hardness which plays the role of a spacer.

FIGS. 5A to 5F are schematic cross-sectional views of a natural ground showing respective steps of an embodiment of a maintenance repair method for aging mortar spraying using a reinforcing structure 10A.
In (a), drilling holes 80 are formed in the aging mortar spray 90 and the ground 100.
In (b), an injection pipe is inserted to the bottom of the hole, and the grout 70 is injected from the bottom of the hole into the entire hole 80. At this point, the grout is unpressurized.
In (c), the discharge injection jig 61 is attached to the reinforcing structure 10 </ b> A provided with the pressure plate 13 and inserted into the hole 80. The discharge injection jig 61 is used for grout discharge. As described above, the internal pressure is controlled by adjusting one or both of the grout discharge amount and the insertion speed. Thus, the insertion of the reinforcing structure 10A is completed.
In (d), a secondary grout is injected. At this time, the discharge injection jig 61 and the water stop jig 65 are used for secondary grout injection.
In (e), the head processing of the base end part of 10 A of reinforcement structures is performed. Preferably, this is performed by a method using the connecting reinforcing bars 20 (described in FIG. 12).
In (f), a mortar spraying work is performed as a surface protection work, and a new mortar spraying 91 is formed on the aging mortar spraying 90.

FIGS. 6A to 6H are schematic cross-sectional views of natural ground showing each step of another embodiment of the maintenance repair method for aging mortar spraying using the reinforcing structure 10A.
In (a), drilling holes 80 are formed in the aging mortar spray 90 and the ground 100.
In (b), an injection pipe is inserted to the bottom of the hole, and the grout 70 is injected from the bottom of the hole into the entire hole 80. At this point, the grout is unpressurized.
In (c), insertion of the reinforcing structure 10 </ b> A provided with the pressure plate 13 into the hole 80 is started. Then, the insertion is temporarily stopped immediately after the pressure plate 13 passes through the entrance of the hole 80.
In (d), with the reinforcing structure 10A stopped, the discharge injection jig 61 and the water stopping jig 65 are attached, and grout is injected into the steel pipe 12 (gap d2 in FIG. 3) and filled. At this time, the hole 12 a of the steel pipe 12 is closed by the water stop jig 65. By adding this step, it is possible to perform construction quickly without taking time for filling the grout into the steel pipe 12 as compared with the above-described method of FIG.
(E) After the grout injection into the steel pipe 12 is completed, the insertion of the reinforcing structure 10A is resumed, and the pressure plate 13 is inserted into the grout. At this time, the discharge injection jig 61 is used for the grouting. The internal pressure is controlled by adjusting one or both of the grout discharge amount and the insertion speed.
In (f), a secondary grout is injected. At this time, the discharge injection jig 61 and the water stop jig 65 are used for secondary grout injection.
In (g), the head processing of the base end portion of the reinforcing structure 10A is performed. Preferably, this is performed by a method using the connecting reinforcing bars 20 (described in FIG. 12).
In (h), a mortar spraying work is performed as a surface protection work, and a new mortar spraying 91 is formed on the aging mortar spraying 90.

(2) Second embodiment of reinforcing structure and its construction method FIG. 7 (a) is a grout (primary) in the maintenance repair method for aging mortar spraying using the reinforcing structure 10B of the second embodiment of the present invention. It is a schematic sectional view showing a grouting step (black arrows indicate the direction of grouting). FIG. 7B is a schematic cross-sectional view showing a step of injecting a secondary grout. Prior to the step of FIG. 7A, formation of the hole 80 is completed. The reinforcing structure 10B will be described with reference to these drawings.

  The reinforcing structure 10B includes a hollow rod-like body 17 for reinforcement. The hollow rod-like body 17 is open at the distal end side and the proximal end side, and is, for example, a hollow bolt. The opening 17 a on the distal end side of the hollow rod-like body 17 is located in the vicinity of the bottom of the hole 80. The reinforcing structure 10B and the reinforcing structure 10A of the first embodiment described above are structurally different in that the rod-shaped body is hollow or solid.

  At a predetermined intermediate position in the axial direction of the hollow rod 17, an annular flat plate 13 is attached. Furthermore, a tubular body 12 extending to the base end side from the pressure plate 13 is provided. A plurality of holes 12 a are provided in the tube wall of the tubular body 12. The structures of the pressure plate 13 and the tubular body 12 are the same as the reinforcing structure 10A of the first embodiment described above.

Hereinafter, a case where a hollow bolt is used as the hollow rod-like body 17 and a steel pipe is used as the tubular body 12 will be described as an example.
In the second embodiment, after the hole 80 is formed, the entire hollow bolt 17 is first inserted into the hole 80 without injecting grout. FIG. 7A shows a subsequent grouting process.

  As shown in FIG. 7A, an adjustment device 60 'is attached to the base end portion of the reinforcing structure 10B. The adjusting device 60 ′ includes an injection jig 61 ′ and a discharge injection hose 64 connected thereto, and a pressure gauge 62 and an opening / closing valve 63 are attached to the discharge injection hose 64. Since the injection jig 61 ′ is connected to the proximal end side opening of the hollow bolt 17, the injection jig 61 ′ has a diameter suitable for the hollow bolt 17. Although not shown, the adjustment device 60 ′ may include a flow meter. Data of a measuring instrument such as the pressure gauge 62 is monitored manually or automatically, and a controller such as the on-off valve 63 is controlled manually or automatically. The adjusting device 60 ′ is used for grout injection in the injection process after the insertion of the hollow bolt 17 is completed.

  When the grout is injected into the hollow bolt 17, the grout 70 is discharged from the opening 17 a on the tip side of the hollow bolt 17 into the hole 80 and filled from the hole bottom side of the hole 80. When the grout 70 reaches the pressure plate 13, the flow resistance is increased by the pressure plate 13, so that the grout on the tip side of the pressure plate 13 is in a pressurized state. By adjusting the amount of grout to be injected, the internal pressure on the tip side can be controlled. Increasing the injection volume increases the internal pressure. When the injection volume is decreased, the internal pressure decreases.

  If the injection is further continued, the grout 70 fills the gap between the steel pipe 12 and the inner wall of the drilling hole 80 beyond the pressure plate 13, and at the same time enters the inside of the steel pipe 12 to fill the inside of the steel pipe 12. Excess grout is discharged from the drilling hole 80.

  After the completion of the grout injection step in FIG. 7A, secondary grout is injected as shown in FIG. 7B. The discharge injection jig 61 used at this time has a larger diameter than the injection jig 61 ′ and is connected to the proximal end side opening of the steel pipe 12. Further, a water stop jig 65 is installed between the discharge injection jig 61 and the opening of the hole 80 to prevent the grout from being discharged from the hole 80. When the secondary grout is injected into the inside of the steel pipe 12, it is supplied to the periphery and the tip of the steel pipe 12 through the hole 12a in the pipe wall of the steel pipe 12 and the gap between the tips, and sufficient pressure is applied at these points. The state can be obtained. Further, since the secondary grout is also supplied to the hole bottom of the drilling hole 80 through the hollow bolt 17, sufficient pressure can be obtained even at the tip portion. Furthermore, the grout is injected into the cavity 102 and the surface ground of the spraying back surface in a pressurized state.

8 (a) to 8 (f) are schematic cross-sectional views of a natural ground showing each process of the maintenance repair method for aging mortar spraying using the reinforcing structure 10B.
In (a), drilling holes 80 are formed in the aging mortar spray 90 and the ground 100.
In (b), the entire reinforcing structure 10 </ b> B including the pressure plate 13 is inserted into the hole 80.
In (c), grout is injected into the hole 80 through the hollow bolt 17. At this time, an injection jig 61 ′ is used for grout injection. As described above, the internal pressure is controlled by adjusting the grout injection amount.
In (d), a secondary grout is injected. At this time, the discharge injection jig 61 and the water stop jig 65 are used for secondary grout injection.
In (e), the head part process of the base end part of the reinforcement structure 10B is performed. Preferably, it is performed by a method using the connecting reinforcing bars 20 (described in FIG. 12).
In (f), a mortar spraying work is performed as a surface protection work, and a new mortar spraying 91 is formed on the aging mortar spraying 90.

(3) Third Example of Reinforcement Structure and its Construction Method FIG. 9 is a schematic cross-sectional view of the maintenance repair method for aging mortar spraying performed by applying the reinforcement structure 10C of the third example of the present invention. It is. 10A is a perspective view of the pressure plate spacer 16 provided in the reinforcing structure 10C of FIG. 9, FIG. 10B is a sectional view taken along line BB of FIG. 9A, FIG. 10C is a developed sectional view, and FIG. FIG. 4 is a cross-sectional view of the pressure plate spacer 16 in an attached state.
A third embodiment will be described with reference to these drawings.

  The reinforcing structure 10C includes a solid bar 11 for reinforcement. The tip of the solid rod-like body 11 is located in the vicinity of the hole bottom of the drilling hole 80. The solid rod-shaped body 11 is, for example, a reinforcing bar. Below, the case where a reinforcing bar is used as the solid rod-like body 11 will be described as an example.

  A pressure plate spacer 16 is attached so as to surround the reinforcing bar 11 at one or a plurality of predetermined intermediate positions (three locations in the illustrated example) in the axial direction of the reinforcing bar 11. The pressure plate spacer 16 is a pressure means for pressing the grout 70 in the hole 80. A surface of the pressure plate spacer 16 facing the tip side becomes a pressure surface that presses the grout 70. However, the pressure plate spacer 16 can be deformed between a pressure form and a non-pressure form, and forms a pressure surface only in the pressure form.

  The material of the pressure plate spacer 16 is preferably made of steel, but may be made of plastic or iron. Further, the pressure plate spacer 16 also serves as a spacer for positioning the reinforcing structure 10 </ b> C at the center of the drilling hole 80. The maximum diameter of the pressure plate spacer 16 that is substantially annular when viewed from the axial direction is set to a size that can serve as a spacer in the drilling hole.

  As shown in FIGS. 10A, 10B, and 10C, the pressure plate spacer 16 is formed by overlapping the first pressure plate member 16a and the second pressure plate member 16b in the axial direction. The first pressure plate member 16a located on the base end side includes an annular portion 16a1 and a plurality of spacer protrusions 16a2 that protrude radially outward at equal angular intervals in the circumferential direction of the outer peripheral edge of the annular portion 16a1. In addition, it includes a cylindrical rotation shaft portion 16a3 that protrudes from the inner peripheral edge of the annular portion 16a1 toward the distal end side in the axial direction. On the other hand, the second pressure plate member 16b located on the distal end side includes an annular portion 16b1 and a plurality of spacer protrusions 16a2 projecting radially outward from the outer peripheral edge of the annular portion 16b1 at equal angular intervals. Each spacer protrusion 16a2 includes a leg portion 16b3 protruding toward the tip side.

  The diameters d4 of the outer peripheral edges of the annular portions 16a1 and 16b1 in the first pressure plate member 16a and the second pressure plate member 16b and the diameters d5 of the arc-shaped outer peripheral edges of the spacer protrusions 16a2 and 16b2 are equal to each other.

  The number of the plurality of spacer protrusions 16a2 and 16b2 in the first pressure plate member 16a and the second pressure plate member 16b is the same, and is not limited to the four illustrated, and may be three or more.

  The rotation shaft portion 16a3 of the first pressure plate member 16a is fitted into and penetrates the center hole of the annular portion 16b1 of the second pressure plate member 16b. Thereby, the 2nd pressurization plate member 16b can be rotated to the surroundings of an axis with respect to the 1st pressurization plate member 16a.

  Further, on the contact surface between the first pressure plate member 16a and the second pressure plate member 16b, a rotation restricting groove 16a4 is formed in the first pressure plate member 16a, and the second pressure plate member 16b is rotated. The movement limiting protrusion 16b4 is formed (these may be formed in reverse). The rotation limiting groove 16a4 is an arc-shaped groove having a predetermined angle range and a predetermined depth, while the rotation limiting protrusion 16b4 is a columnar protrusion that can slide in the rotation limiting groove 16a4. These define a relative rotation range between the two pressure plate members. In the example shown in the figure, since there are four spacer protrusions, the angle range is 45 degrees. As another example, when there are three spacer protrusions, the angle range of the rotation limiting groove is 60 degrees.

  FIG. 10D is a cross-sectional view in the axial direction showing a state where the pressure plate spacer 16 is attached to the reinforcing bar 11. The reinforcing bar 11 passes through the central hole of the first pressure plate member 16a. The first pressure plate member 16a is fixed to the reinforcing bar 11 by appropriate fixing means (not shown). As a result, the first pressure plate member 16 a rotates around the axis integrally with the reinforcing bar 11. On the other hand, the second pressure plate member 16 b is not fixed to the reinforcing bar 11. Therefore, the second pressure plate member 16 b can rotate with respect to the reinforcing bar 11. The fastener 19 is an appropriate jig for stopping the movement of the second pressure plate member 16b in the axial direction.

  The entire shape of the pressure plate spacer 16 changes according to the angular position around the relative axis of the first pressure plate member 16a and the second pressure plate member 16b.

  11A is a view of the pressure plate spacer 16 in a non-pressurized form, and FIG. 11B is a view of the pressure plate spacer 16 in a pressurized form as viewed from the front end side in the axial direction. (a-1) and (b-1) show the first pressure plate member 16a, (a-2) and (b-2) show the second pressure plate member 16b, and (a-3) and ( b-3) is a diagram showing the entire superimposed pressure plate members.

  In the non-pressurized form of FIG. 11A, the spacer projections 16a2 and 16b2 of the pressure plate members 16a and 16b are at the same angular position as shown in (a-1) and (a-2). -3), the spacer protrusions 16a2 and 16b2 are completely overlapped when viewed from the axial direction. Accordingly, a gap d6 is formed between adjacent spacer protrusions. In the non-pressurized form, the grout can pass through this gap d6. Therefore, in the non-pressurized form, there is almost no pressurizing effect on the grout.

  In the pressurization form of FIG. 11 (b), as shown in (b-1) and (b-2), the spacer protrusions 16a2 and 16b2 of the pressurizing plate members 16a and 16b are at angular positions shifted from each other. In the illustrated example, the two sets of spacer protrusions are offset from each other by 45 degrees. Therefore, as shown in (b-3), the outermost peripheral edge is completely circular as viewed from the axial direction. That is, the gap d6 through which the grout passes is closed. In this pressurization mode, the surface on the tip side of the pressure plate spacer 16 functions as a pressurization surface. In addition, the circumferential length of each spacer protrusion is set so that a completely closed circle can be formed in the pressurization mode.

  With reference to FIG. 9 again, the maintenance repair method of the aging mortar using the reinforcing structure 10C will be described. First, the drilling holes 80 are formed in the aging mortar spray 90 and the natural ground 100. Next, the grout 70 is injected into the entire hole 80. At this point, the grout is unpressurized.

  Subsequently, the reinforcing structure 10 </ b> C is inserted into the hole 80. At the beginning of insertion, the pressure plate spacer 16 is in a non-pressurized form. When the pressure plate spacer 16 is in a non-pressurized form, the insertion resistance of the reinforcing structure 10 </ b> C is equivalent to that of the reinforcing bar 11 alone. After the pressure plate spacer 16 is inserted into the grout, the reinforcing bar 11 is rotated around the axis. At this time, the first pressure plate member 16a rotates together with the reinforcing bar 11, whereas the second pressure plate member 16b follows the rotation of the first pressure plate member 16a due to resistance by the leg portion 16b3. do not do. As a result, the pressure plate spacer 16 shifts to the pressure form. Whether the transition from the non-pressurized form to the pressurized form can be confirmed by the insertion resistance.

  When the reinforcing structure 10C is used, the internal pressure is not monitored by adjusting the insertion resistance without monitoring the grout discharge or injection pressure as in the first embodiment or the second embodiment. To control. If the insertion is continued in the pressurized state, the pressure of the grout on the tip side increases. Note that the size of the gap d6 through which the grout passes can be changed by adjusting the degree of displacement between the spacer protrusions 16a2 and 16b2. This can be used to adjust the insertion resistance.

  In addition, by rotating the reinforcing bar 11 in the reverse direction, the pressure plate spacer 16 can be shifted from the pressurized form to the non-pressurized form. For example, when an unexpected situation occurs in the middle of insertion and the reinforcing structure 10C has to be pulled out once, it can be easily pulled out by returning from the pressurized mode to the non-pressurized mode.

  After the insertion of the reinforcing structure 10C is completed, the head processing of the base end portion of the reinforcing structure 10C is performed (described in FIG. 12). Then, new mortar spraying is performed.

(4) Head Processing FIG. 12A is a cross-sectional view for explaining an example of head processing performed after insertion of the reinforcing structure 10C is completed, and FIG. 12B is a connection reinforcing bar shown in FIG. (C) is a side view thereof. Furthermore, FIG.12 (d) is a top view of another Example of a connection reinforcing bar, (e) is the side view. In addition, the head process demonstrated in FIG. 12 can be performed similarly about reinforcement structure 10A, 10B of the above-mentioned 1st and 2nd Example.

  As shown in FIG. 12 (a), at the base end portion of the reinforcing structure 10C, the head of the reinforcing bar 11 (the reinforcing bar 11 in the first embodiment, the hollow bolt 17 in the second embodiment) is sprayed with aging mortar. Projecting from 90. First, a cross-shaped connecting reinforcing bar 20 is installed through the reinforcing bar 11, a pressing plate 21 and a washer 22 are further installed, and fastened by a nut 23. Thereby, the base end part of the reinforcement structure 10 is fixed.

  As shown in FIG. 12B, the cross-shaped connecting reinforcing bar 20 of one embodiment prepares two substantially rectangular ring-shaped reinforcing bars 20a and 20b, and is superposed so as to be perpendicular to each other in the center in the longitudinal direction. ing. Joining is, for example, by welding or fastening. The rebar 11 can penetrate through the overlapped central opening 20c. Each of the substantially rectangular ring-shaped reinforcing bars 20a and 20b is bent at an obtuse angle with respect to the central portion at both ends.

  When fixing the connecting reinforcing bar 20, as shown in FIG. 12A, the central part of the connecting reinforcing bar 20 is pressed and deformed and fixed in a state of being in contact with the surface of the aging mortar 90. At this time, the bent end portions are placed on the surface of the aging mortar 90, so that they are not caught during the operation, and an effect of pressing the aging mortar 90 against the ground is also obtained.

  12 (d) and 12 (e), a connecting reinforcing bar 20A is provided with two reinforcing bars 20a1 and 20a2 in place of the substantially rectangular ring-shaped reinforcing bar 20a of the examples of (b) and (c). Instead of the rectangular ring-shaped reinforcing bar 20b, two reinforcing bars 20b1 and 20b2 are provided. In both rebars, both ends are bent at an obtuse angle with respect to the center. The connecting reinforcing bar 20 </ b> A can be easily and inexpensively manufactured compared to the connecting reinforcing bar 20.

  Each embodiment of the cross-shaped connecting reinforcing bar includes two long reinforcing bar elements, and the two reinforcing bar elements are stacked so as to be orthogonal to each other in the longitudinal center portion thereof. Each of the elements includes at least two reinforcing bars arranged in parallel, and both ends of the two reinforcing bars are bent with respect to the central part. In addition, the number of reinforcing bars arranged in parallel in one reinforcing bar element is not limited to two, and may be an even number (for example, four).

  By using such cross-shaped connecting reinforcing bars 20 and 20A, it is possible to arrange the reinforcing bars on the aging mortar spraying easily and in a short time even when working on a scaffold using a rope. This saves labor and makes it more efficient.

  Here, FIG. 9 will be referred to again. FIG. 9 shows another embodiment of the head processing using the cross-shaped connecting reinforcing bars 20. In FIG. 9, the pressing plate 21 is first installed on the head of the reinforcing bar 11 and fixed with the first nut 23 a. This is performed when it is necessary to fasten and fix the head by attaching the pressing plate 21 immediately after the insertion of the reinforcing structure. Then, the cross-shaped connecting reinforcing bar 20 is installed and fixed with the second nut 23b. In this case, unlike FIG. 12A, the cross-shaped connecting reinforcing bar 20 is not deformed. Instead of the connecting reinforcing bar 20, a connecting reinforcing bar 20A may be used.

  Another example of use of the cross-shaped connecting reinforcing bars 20 and 20A will be described. Usually, a plurality of reinforcing structures are installed for aging mortar spraying, but when the interval between them is wide, auxiliary reinforcing bar insertion work is performed at an appropriate intermediate position. In the auxiliary rebar insertion work, short rebars are inserted into shallow holes and filled with mortar. And it is suitable to use the cross-shaped connecting reinforcing bars 20 and 20A for the head processing of those short reinforcing bars. Thereby, integration of aging mortar spraying and new mortar spraying can be improved.

(5) Summary The present invention is not limited to the above-described embodiments. The features common to all the embodiments of the present invention are summarized below.
A reinforcing structure according to the present invention is a reinforcing structure that is inserted into a hole formed in an old mortar spray and a natural ground and is fixed by a grout in order to maintain and repair the old mortar spray. A reinforcing rod having a length extending over the entire length, and a pressure surface that surrounds and is attached to the rod at one or a plurality of positions in the axial direction of the rod and faces the tip in the axial direction. And pressurizing means.
In addition, the maintenance repair method for aging mortar spraying using the above reinforcing structure according to the present invention includes the steps of forming a drilling hole in the aging mortar spraying and the ground, and injecting the grout into the entire drilling hole. By inserting the reinforcing structure into the hole, or by inserting grout into the hole after inserting the entire reinforcing structure into the hole, the pressing surface formed in the pressing means is And a step of pressurizing the grout on the tip side of the pressing surface.

10A, 10B, 10C: Reinforcing structure 11: Reinforcing bar 12: Steel pipe 12a: Hole 12b: Tip surface 13: Pressure plate 13a: Pressure plate inner peripheral edge 13b: Pressure plate outer peripheral edge 13c: Pressure surface 13d: Elastic spacer 14: Fixed treatment Tool 16: Pressure plate spacer 16a: Pressure plate member 16a1: Annular portion 16a2: Spacer projection 16a3: Fixed shaft portion 16a4: Rotation limiting groove 16b: Pressure plate member 16b1: Annular portion 16b2: Spacer projection 16b3: Leg portion 16b4: Turn Movement restricting projection 17: Hollow bolt 17a: Tip opening 19: Fastener 20, 20A: Cross connecting bar 21: Press plate 22: Washer 23: Nut 60, 60 ': Adjusting device 61: Discharge injection jig 61': Injection treatment Equipment 62: Pressure gauge 63: Open / close valve 64: Discharge injection hose 65: Water stop jig 66: Exhaust valve 70: G Uto 80: drilling 90: Old Mortar spray 91: New Mortar spray 100: natural ground 101: natural ground surface 102: cavity 110: reinforcement

Claims (16)

To maintain and repair the aging mortar spray (90), the reinforcement structure (10A, 10B) is inserted into the mortar spray (90) and the drill hole (80) formed in the natural ground (100) and fixed by the grout. , 10C)
A reinforcing rod-shaped body (11, 17) having a length over substantially the entire length of the hole,
It is possible to form a pressure surface which is attached to surround the rod-shaped body (11, 17) at one or a plurality of positions in the axial direction of the rod-shaped body (11, 17) and faces the tip side in the axial direction. And a pressurizing means (13, 16). A reinforcing structure (10A) according to claim 1,
The rod-shaped body is a solid rod-shaped body (11),
A tubular body (12) disposed coaxially with a predetermined gap (d2) between the solid rod-shaped body (11) and extending proximally than the pressurizing means;
The pressurizing means is an annular flat pressure plate (13) that is fixed to the distal end surface (12b) of the tubular body (12) and has a larger diameter than the distal end surface (12b). Structure. A reinforcing structure (10B) according to claim 1,
The rod-shaped body is a hollow rod-shaped body (17),
A tubular body (12) disposed coaxially with a predetermined gap (d2) between the hollow rod-shaped body (17) and extending proximally than the pressurizing means;
The pressurizing means is an annular pressure plate (13) fixed to the distal end surface (12b) of the tubular body (12) and having a larger diameter than the distal end surface (12b). body.   The reinforcing structure (10B) according to claim 2 or 3, wherein a plurality of holes (12a) are provided in a tube wall of the tubular body (12).   The reinforcing structure (10B) according to any one of claims 2 to 4, further comprising a plurality of elastic spacers (13d) protruding radially outward from an outer peripheral edge (13b) of the pressure plate (13). Reinforcing structure. A reinforcing structure (10C) according to claim 1,
The rod-shaped body is a solid rod-shaped body (11),
The pressure means is a pressure plate spacer (16) in which a first pressure plate member (16a) and a second pressure plate member (16b) are overlapped in the axial direction,
The first pressure plate member (16a) is fixed to the solid rod-like body (11) and has a first annular portion (16a1) and a plurality of first members protruding radially outward from the first annular portion. Spacer protrusion (16a2)
The second pressure plate member (16b) is rotatable around the axis of the solid rod-like body (11), and radially outward from the second annular portion (16b1) and the second annular portion. A plurality of protruding second spacer protrusions (16b2) and leg portions (16b3) protruding in the axial direction from the second spacer protrusions (16b2); and
When the second pressure plate member (16b) is rotated with respect to the first pressure plate member (16a), the pressure plate spacer (16) is viewed from the axial direction. A non-pressurized configuration in which two spacer projections (16a2, 16b2) overlap each other, and a pressurized configuration in which the first and second spacer projections (16a2, 16b2) are displaced from each other to form the pressurization surface Reinforcement structure characterized in that it can be transferred between. A maintenance repair method for aging mortar spraying using the reinforcing structure (10A, 10B, 10C) according to claim 1,
Forming the drilling holes (80) in the aging mortar spraying (90) and ground (100);
After injecting grout (70) into the whole hole (80), the reinforcing structure (10A, 10C) is inserted into the hole (80), or into the hole (80). By inserting the grout (70) into the drilling hole (80) after inserting the entire reinforcing structure (10B), the pressing surface formed on the pressing means (13, 16) is A method of maintaining and repairing aging mortar spraying, characterized by comprising a step of pressurizing the grout (70) on the tip side of the pressing surface. A maintenance repair method for aging mortar spraying using the reinforcing structure (10A) according to claim 2,
Forming the drilling holes (80) in the aging mortar spraying (90) and ground (100);
Injecting grout (70) into the entire hole drilling (80);
Inserting the reinforcing structure (10A) into the drilling hole (80) so that the pressure plate (13) presses the grout (70) on the tip side of the pressure plate (13); The maintenance repair method of the aging mortar spraying characterized by having. In the maintenance repair method of aging mortar spraying according to claim 8,
During the insertion of the reinforcing structure (10A) into the drilling hole (80), the insertion is temporarily stopped immediately after the pressure plate (13) passes through the inlet of the drilling hole, and the solid rod-shaped body (11) A maintenance repair method for aging mortar spraying, characterized in that grout (70) is injected into the gap (d2) between the tubular body (12) and the insertion is resumed. In the maintenance repair method of aging mortar spraying according to claim 8 or 9,
When inserting the reinforcing structure (10A) into the hole (80), by adjusting at least one of the amount of grout (70) discharged from the hole (80) and the insertion speed, A maintenance repair method for aging mortar spraying, characterized by controlling the internal pressure of the drilling hole (80). In the maintenance repair method of the aging mortar spraying according to any one of claims 8 to 10,
A method for maintaining and repairing aging mortar spraying, comprising the step of injecting secondary grout into the drilling hole (80) after the insertion of the reinforcing structure (10A) is completed. A maintenance repair method for aging mortar spraying using the reinforcing structure (10B) according to claim 3,
Forming the drilling holes (80) in the aging mortar spraying (90) and ground (100);
Inserting the entire reinforcing structure (10B) into the hole drilling (80);
By injecting the grout (70) into the hole (80) through the hollow of the hollow rod-like body (17) of the reinforcing structure (10B), the pressure plate (13) is moved to the pressure plate (13). Pressurizing the grout (70) on the tip side of the mortar, and maintaining and repairing the aging mortar spraying. In the maintenance repair method of aging mortar spraying according to claim 12,
Adjusting the amount of grout (70) injected into the hollow of the hollow rod-shaped body (17) when the grout (70) is poured into the hole (80) through the hollow of the hollow rod-shaped body (17). A method for maintaining and repairing aging mortar spraying, characterized in that the internal pressure of the drilling hole (80) is controlled by the above. A maintenance repair method for aging mortar spraying using the reinforcing structure (10C) according to claim 6,
Forming the drilling holes (80) in the aging mortar spraying (90) and ground (100);
Injecting grout (70) into the entire hole drilling (80);
The insertion of the reinforcing plate (10C) into the hole (80) is started with the pressure plate spacer (16) as the non-pressurized form, and the solid rod-like body (11) is moved around the axis while being inserted. Moving the pressure plate spacer (16) to the pressure mode by rotating;
By further inserting the reinforcing structure (10C) into the drilling hole (80), the pressure plate spacer (16) in the pressurization form is moved to the grout (70 on the tip side of the pressure plate spacer). A method of maintaining and repairing aging mortar spraying. In the maintenance repair method of the aging mortar spraying according to any one of claims 7 to 14,
After completing both the injection of the grout (70) into the drilling hole (80) and the insertion of the reinforcing structure (10A, 10B, 10C) into the drilling hole (80), the reinforcing structure (10A, Fixing the base end of the reinforcing structure (10A, 10B, 10C) after attaching the cross-shaped connecting reinforcing bars (20, 20A) to the base end of 10B, 10C);
A method for maintaining and repairing aging mortar spraying, comprising: forming a new mortar spraying (91) by spraying mortar on the aging mortar spraying (90). The connection reinforcing bar (20, 20A) used in the maintenance repair method for aging mortar spraying according to claim 15,
With two long rebar elements,
The two reinforcing bar elements are superposed so as to be orthogonal to each other in the center in the longitudinal direction,
Each of the two reinforcing bar elements includes at least an even number of reinforcing bars arranged in parallel, and both ends of the even number of reinforcing bars are bent with respect to the central portion.

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