JPH108890A - Rebar assembling apparatus and secondary lining method for tunnel using the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the workability of secondary lining by reducing the stress on the worker and preventing bending of the rebar. SOLUTION: On the ceiling surface of the tunnel after primary lining,
Rebar assembling trolley 10 for arranging rebar 3 for secondary lining
A supporting frame 20 for supporting the reinforcing bar 3b for the ceiling surface assembled according to the shape of the ceiling surface of the tunnel, an elevating mechanism 40 for vertically moving the supporting frame 10, and a supporting frame 10 in the circumferential direction of the tunnel. A configuration including a turning mechanism 50 for turning is adopted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rebar assembling apparatus for arranging a reinforcing bar for secondary lining on a ceiling surface of a tunnel after primary lining, and a tunnel lining method using the same. .

[0002]

2. Description of the Related Art As a method for lining a large-diameter tunnel, a primary lining is performed by placing a segment inside a main hole excavated in the ground, and then a waterproof sheet is stretched inside the segment. , Arrange rebar along the inside of the tarpaulin,
Further, there is a method in which a formwork is erected inside the reinforcing bar, and concrete is poured and filled between the segments and the formwork to perform secondary lining.

[0003] In the secondary lining work, a hole is made through the waterproof sheet inside the segment, and a setup bar for fixing a reinforcing bar is attached to the hole.

[0004] By the way, when the setup bar is attached through the waterproof sheet as described above, the water blocking effect of the waterproof sheet is reduced by the hole opened in the waterproof sheet, and the leakage of the groundwater from the joint of concrete after the secondary lining. Could happen. Therefore, a method of arranging a reinforcing bar inside a segment without using a setup bar has been studied.

[0005]

However, the work of arranging the reinforcing bars inside the segments, particularly the arranging of the reinforcing bars along the ceiling surface, raises the reinforcing bars one by one to the top end and binds them together. Therefore, the physical load on the worker was large and workability was poor.

Moreover, in this case, the reinforcing bar (the portion shown in FIG. A) bent along the ceiling surface of the tunnel is bent downward, and the bent form is hit by the formwork. There is a problem that the reinforcing bar is bent after the installation of the formwork, the cover of the reinforcing bar is not formed according to the specification even when the concrete is cast, and an operation of repairing this portion is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the workability of the secondary lining by reducing the stress on the operator and preventing bending of the rebar. I have.

[0008]

According to a first aspect of the present invention, there is provided a rebar assembling apparatus, comprising: a support frame for supporting a rebar for a ceiling surface assembled according to a shape of a ceiling surface of a tunnel after a primary lining; An elevating mechanism for elevating and lowering the support frame in a vertical direction.

According to a second aspect of the present invention, there is provided a reinforcing bar assembling apparatus including a turning mechanism for turning the support frame in the circumferential direction of the tunnel in the first embodiment.

[0010] A secondary lining method for a tunnel according to a third aspect is the secondary lining method for a tunnel using the rebar assembling apparatus according to the first or second aspect, wherein the primary lining is completed. Side reinforcing bars are placed along both sides of the tunnel, and the reinforcing bars for the ceiling assembled according to the shape of the ceiling surface of the tunnel are moved to a position along the ceiling surface using a reinforcing bar assembly device. It is characterized in that it is joined with a side reinforcing bar, a formwork is assembled along these side reinforcing bar and ceiling surface reinforcing bar, and concrete is poured and filled into the formwork.

The secondary lining method for a tunnel according to a fourth aspect of the present invention is the secondary lining method for a tunnel according to the third aspect, wherein the reinforcing steel for the ceiling is provided along the axial direction and the circumferential direction of the tunnel. The reinforcing bars are arranged in a net shape, and some of the reinforcing bars arranged in the circumferential direction are thicker than other reinforcing bars.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. First, FIG. 1 shows a tunnel constructed by employing the secondary lining method of the present embodiment. In this tunnel, a segment 1 is used for primary lining, and a waterproof sheet 2 is stretched over the entire surface inside the segment 1. Further, as a secondary lining, a reinforcing bar 3 is provided along the inside of the waterproof sheet 2, and the reinforcing bar 3 is embedded so that a concrete portion is formed.

The reinforcing bar 3 includes a side reinforcing bar 3a provided along both sides of the tunnel and a ceiling reinforcing bar 3b provided along the ceiling surface of the tunnel. Side reinforcing bar 3
a, the ceiling surface reinforcing bar 3b is formed in a net shape by a straight rectilinear bar S disposed in the axial direction of the tunnel and an arc-shaped curved bar R disposed in the circumferential direction. These are combined in a substantially cylindrical shape along the inside of the segment 1 to form a reinforcing arch.

The side reinforcing bar 3a is buried in a flat base 6 formed at the bottom of the tunnel, and is fixed in a state where the end protrudes upward. The ceiling reinforcing bar 3b is connected to the side reinforcing bar 3a. They are tied together with their ends wrapped and fixed inside the tunnel.

The curved lines R arranged in the circumferential direction of the tunnel are:
They are continuously arranged at equal intervals in the axial direction of the tunnel.
Reinforcing curved bars R ′ having a larger diameter than that of the reinforcing bar and helping the reinforcing steel arch to be independent are provided at predetermined intervals.

Next, the procedure of the secondary lining of the tunnel will be described. After completing the primary work with the segment 1, the waterproof sheet 2 is first attached along the inside of the segment 1. Next, side reinforcing bars 3a are respectively arranged along both side surfaces of the tunnel after the primary lining. The ceiling reinforcing bar 3b assembled according to the shape of the tunnel ceiling surface,
It joins with the side reinforcing bar 3a along the ceiling surface. A formwork is assembled along the side reinforcing bar 3a and the ceiling reinforcing bar 3b, and concrete is poured into the formwork to form a concrete portion, thereby completing the secondary work.

In order to make the reinforcing bar 3b for the ceiling surface along the ceiling surface, a rebar assembling cart (rebar assembling apparatus) 10 described below is used.
Use As shown in FIG.
A support frame 20 for supporting the reinforcing steel bar 3b for a ceiling surface is provided on a frame 11 capable of self-running on a rail 7 laid on a base portion 6.
And a lifting mechanism 4 for raising and lowering the support frame 20 in the vertical direction.
0 and a turning mechanism 50 for turning the support frame 20 in the circumferential direction of the tunnel.

The frame 11 has a truss structure combining strong steel materials, and wheels 12 for traveling on the rail 7 are arranged at front and rear ends and intermediate positions along the construction direction of the tunnel. . Further, a self-propelled device 13 for self-propelling the truck is attached to the wheel 12 located at the rear end.

The support frame 20 is movably supported on the upper portion of the frame 11 by an elevating mechanism 40 and a turning mechanism 50. The support frame 20 not only supports and lifts the reinforcing steel bar 3b for the ceiling surface, but also supports a jig for assembling the support frame 20. As shown in FIG. 3, as shown in FIG. 3, a horizontal frame 21 that supports the curved reinforcement R that forms the reinforcing bar 3b for the ceiling surface, and an arc frame that supports the straight bar S that forms the reinforcing bar 3b for the ceiling surface 25 and ceiling reinforcing bar 3b
Are combined in a lattice shape in accordance with the shape of.

The horizontal frame 21 is provided on an upper flange 22a of a strong H-section steel 22 along a length direction of the H-section steel.
On the upper edge of the steel plate 23, a plurality of V-grooves 24 in which the curved lines R are arranged are formed at predetermined intervals, and a total of four V-grooves 24 are arranged at intervals in the circumferential direction of the tunnel. This is installed. The circular arc frame 25 is formed by forming a steel plate 26 in an arc shape along the circumferential direction of the tunnel, and a V groove 27 in which a straight line S is arranged is provided at a predetermined interval on an upper edge of the steel plate 26. Plural pieces are provided, and a total of four pieces are installed at intervals in the axial direction of the tunnel so as to be orthogonal to the horizontal frame 21.

The supporting frame 20 is provided on a horizontal frame 21 on a guide rail 30 which is supported by a lifting mechanism 40 provided above the frame 11 so as to be vertically movable. It is mounted via the rolling rollers 28 and is supported on the guide rail 30 so as to be able to turn in the circumferential direction of the tunnel on the guide rail 30 by a swiveling mechanism 50 which is stretched and stretched on the guide rail 30 side and the support frame 20 side. .

The guide rail 30 is made of an H-shaped steel 31 bent in an arc shape. The guide rail 30 rolls the roller 28 along its flange 31a to support the support frame 20 so as to be pivotable in the circumferential direction of the tunnel. Are installed at intervals in the axial direction of the tunnel, and are integrally connected by an H-shaped steel 32 erected between both guide rails 30 in the axial direction of the tunnel.

The elevating mechanism 40 includes a drive cylinder 41 for elevating and lowering the guide rail 30, and a driven saddle 45 for supporting the vertical movement of the guide rail 30. The drive cylinder 41 is connected to the cylinder 11
And the piston 43 is swingably connected to the lower portion of the H-shaped steel 32. The guide rail 30 is raised in the direction of the arrow (a) in FIG. It is made to let. The driven saddle 45 accurately moves the guide rail 30 vertically upward by pulling out a rod-shaped saddle 46 built in a column constituting the frame 11 with the extension of the drive cylinder 41.

The turning mechanism 50 has a driving cylinder 51 for turning the support frame 20. This drive cylinder 51
Are installed at positions adjacent to the respective arc frames 25, and the cylinder 52 is swingably connected to the H-shaped steel 32 and the piston 53 is swingably connected to the horizontal frame 21. By extending and retracting the piston 53, the support frame 20 is moved in the direction of the arrow (b) in the figure (the circumferential direction of the tunnel).
Is turned.

The roller 28 is, as shown in FIG. 4, an arm 28a fixed to the web 22b of the H-section steel 22.
And rolls on the flange 31a of the guide rail 30. Further, the roller 28 is combined with an auxiliary roller 29 which is supported by a plate 29a fixed to the lower flange 22c of the H-shaped steel 22 and rolls in contact with the upper flange 31a of the guide rail 30 from below. Since the roller 28 and the auxiliary roller 29 are engaged with each other with the upper flange 31a of the guide rail 30 sandwiched from above and below, the movement of the support frame 20 in the circumferential direction of the tunnel is supported.

In addition, the rebar assembling trolley 10 has a chain block 60 for lifting the straight bars S and the curved bars R constituting the reinforcing bar 3b for the ceiling surface on the truck, and for transporting the straight bars S and the curved bars R on the truck. Trolley 70, ceiling reinforcing bar 3
In order to assemble b, a scaffold 80 or the like for workers provided with steps in steps according to the shape is provided.

The procedure for arranging the reinforcing bar 3b for the ceiling surface on the ceiling surface of the tunnel by using the reinforcing bar assembly truck configured as described above will be described with reference to FIG. First, as shown in FIG. 5 (i), a straight line S and a curved line R are lifted on a bogie, and these are arranged on a support frame 20 to assemble a ceiling reinforcing bar 3b.
Then, as shown in FIG. 5 (ii), the drive cylinder 41 provided in the elevating mechanism 40 is extended to elevate the support frame 20, and the ceiling reinforcing bar 3b is made to follow the ceiling surface of the tunnel.
Next, the support frame 20 is turned by extending and retracting the drive cylinder 51 provided in the turning mechanism 50, and the wrap length between the curved line R of the reinforcing bar 3b for the ceiling surface and the curved line R of the side reinforcing bar 3a to be joined thereto is determined. Adjust. If there is a deviation in the axial direction of the tunnel between the curved line R of the reinforcing bar 3b for the ceiling surface and the curved line R of the side reinforcing bar 3a to be joined thereto, the reinforcing bar assembly 10
By moving itself along the rail 7, the deviation is eliminated.

By using the rebar assembling trolley 10 as described above, the work of arranging the reinforcing bar 3b for the ceiling surface, which has been conventionally performed manually, is performed by the rebar assembling apparatus, thereby reducing the stress on the operator. As a result, the workability of the secondary lining can be improved, so that the entire construction period can be significantly shortened and the construction cost can be reduced.

Further, the tunnel constructed by employing the above-described secondary construction method has a structure in which the reinforcing steel bars 3b for the ceiling surface arranged in a net shape are formed by the curved reinforcing bars R arranged in the circumferential direction of the tunnel. In addition, by arranging reinforcing reinforcing bars R 'having a diameter larger than that of the other curved bars R and helping the reinforcing bars self-supporting at predetermined intervals, the reinforcing bars are self-supporting and the conventional reinforcing bars are fixed. The used streaks can be omitted, and the waterproof sheet 2 can be effectively used to stop the water, thereby preventing the groundwater from leaking from the joint of the concrete after the secondary lining. In addition, the reinforcing bar R ′ is used for reinforcing the ceiling surface 3b.
Can be favorably installed on the formwork that forms the concrete portion by preventing bending of the mold. Furthermore, the cover of the reinforcing bar 3 can be formed as specified when concrete is cast.

[0030]

As described above, according to the reinforcing bar assembling apparatus according to the first aspect, the reinforcing steel for the ceiling surface, which is assembled according to the shape of the ceiling surface of the tunnel after the primary lining, is used as the supporting frame. By assembling and supporting the above, and by raising and lowering this support frame by the elevating mechanism, the reinforcing steel for the ceiling surface can be made to conform to the ceiling surface of the tunnel. The installation work is performed by the rebar assembling apparatus, so that the proof stress of the worker can be reduced, and the workability of the secondary lining can be improved.

According to the reinforcing bar assembling device of the present invention, the supporting frame supporting the reinforcing bar for the ceiling surface is turned in the circumferential direction of the tunnel by the turning mechanism, thereby wrapping the reinforcing bar for the ceiling surface and the side reinforcing bar. The length can be adjusted.

[0032] According to the secondary lining method for a tunnel described in claim 3, the reinforcing steel for the ceiling surface assembled according to the shape of the ceiling surface of the tunnel is positioned along the ceiling surface by using a reinforcing bar assembly device. And rejoining with the side rebar, the rebar assembler performs the work of arranging the rebar for the ceiling, which has been done manually, and reduces the physical load on the workers. Therefore, the workability of the work can be improved, so that the entire construction period can be significantly shortened and the construction cost can be reduced.

[0033] According to the secondary lining method for a tunnel described in claim 4, the reinforcing steel for the ceiling surface, which is formed by reinforcing the reinforcing steel along the axial direction and the circumferential direction of the tunnel, is disposed in the circumferential direction. By making some of the rebars thicker than the other rebars, the rebar arches can be made independent and the setup bars used to fix the rebars can be omitted. It is possible to effectively prevent water leakage from ground joints or the like after the secondary lining by effectively stopping water. In addition, by making the reinforcing bar thick, it is possible to prevent the bending of the reinforcing bar, favorably install a formwork that forms the concrete portion, and furthermore, it is possible to form the cover of the reinforcing bar as specified when the concrete is poured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a tunnel constructed by a secondary construction method for a tunnel according to the present invention.

FIG. 2 is a side view showing an embodiment of a reinforcing bar assembly cart according to the present invention.

FIG. 3 is a perspective view showing a support frame provided in the reinforcing bar assembly cart in FIG. 2;

FIG. 4 is a perspective view showing rollers provided in the reinforcing bar assembly cart in FIG. 2;

FIG. 5 is a cross-sectional view showing a procedure for arranging a reinforcing bar for a ceiling using the reinforcing bar assembly cart in FIG. 2;

[Explanation of symbols]

 3 Reinforcing Bar 3a Reinforcing Bar for Side Side 3b Reinforcing Bar for Ceiling Surface 10 Reinforcing Bar Bogie (Reinforcing Bar Assembling Device) 20 Support Frame 30 Guide Rail 40 Elevating Mechanism 50 Rotating Mechanism

Claims (4)

[Claims] Claims 1. On the ceiling surface of a tunnel after primary lining,
A reinforcing bar assembling device for arranging reinforcing bars for secondary lining, comprising: a supporting frame for supporting a reinforcing bar for a ceiling surface assembled according to a shape of a ceiling surface of a tunnel; and a vertically extending supporting frame. A rebar assembling device comprising a lifting mechanism for lifting and lowering. 2. The rebar assembling apparatus according to claim 1, further comprising a turning mechanism for turning the support frame in a circumferential direction of the tunnel. 3. A reinforcing rod for a side surface is provided along both sides of a tunnel after the primary lining, and a reinforcing rod for a ceiling surface assembled according to a shape of a ceiling surface of the tunnel is provided by the reinforcing bar assembling apparatus. It is then moved to a position along the ceiling surface and joined to the side reinforcing bar, a formwork is assembled along these side reinforcing bar and ceiling surface reinforcing bar, and concrete is poured and filled into the formwork. A secondary lining method for a tunnel using the rebar assembling apparatus according to claim 1 or 2. 4. The reinforcing steel for the ceiling surface is formed in a mesh shape by reinforcing the reinforcing steel along the axial direction and the circumferential direction of the tunnel, and some of the reinforcing steels arranged in the circumferential direction are thicker than other reinforcing steels. A secondary lining method for a tunnel using the rebar assembling apparatus according to claim 3.