JPH0485497A - Installation of curved slab for tunnel lining onto tunnel foundation - Google Patents

Abstract

PURPOSE:To reduce a construction period by assembling a plurality of tunnel lining curved slabs along the internal wall on the internal wall of the existing tunnel having a circular section to line the internal wall. CONSTITUTION:Anchor bolts 8 are driven into a position to install a lower curved slab 5 lengthwise of a tunnel 1 at a certain interval in the foundations la on both sides of the tunnel 1. After that, the anchor bolts are surrounded by a frame body, and a trapezoid form 10 is filled with a filling solidified material 11 sucha as mortar to form a guide projection 9. Then, a guide recess 12 is provided to the contact end 13 of the lower curved slab 5, the guide projection is fitted to the guide recess 12 to place the lower curved slab 5 on the foundation la, and it is connected to the upper curved slab 4. According to the constitution, the positioning of the curved slabs can be easily made.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for repairing, for example, a curved version for tunnel lining by assembling the inner wall of an existing tunnel having an arcuate cross section. This relates to a method for accurately positioning and installing the tunnel foundation.

[Conventional technology] For example, to repair the inner wall of an existing tunnel that is at risk of collapsing by lining it, reinforcing bars are placed inside the inner wall of the lining section, and then formwork is placed inside the reinforcing bars. There is a conventional method of pouring concrete into the formwork after it is assembled. However, this method has the disadvantage that it takes a long time from installing the reinforcing bars and formwork to curing the concrete, which lengthens the repair period and delays the reuse of the tunnel.

Therefore, a curved slab for tunnel lining in the form of a circular arc that is divided into multiple sections with a curvature that follows the inner wall of the tunnel is manufactured in advance from reinforced concrete, and this curved slab is transported to the site and assembled along the inner wall of the tunnel. , and the inner wall of the tunnel is covered by connecting them to each other, and a method of injecting grout material such as mortar into the gap between the connected curved plates and the inner tunnel wall is becoming increasingly popular.

[Problems to be Solved by the Invention] As described above, when assembling the curved plates along the tunnel inner wall, the left and right lowermost curved plates installed on the base, which is the bottom of the tunnel, are placed close to the tunnel inner wall without grouting. The tunnel is placed along the length of the tunnel at a predetermined gap for injection, and this lowermost curved version becomes the base of the curved version connected to the upper part.
Since the posture of the lining with respect to the tunnel is determined by the entire curved slab, the positioning of the lining (in particular, placing it along the length of the tunnel at a certain distance from the tunnel inner wall) requires high precision. is required. Therefore, it is necessary to take some kind of positioning means to the foundation of the existing tunnel, or it is difficult to install it easily and quickly on the curved tunnel foundation because it is an existing tunnel. The current situation is what is desired.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and includes assembling a plurality of curved plates for tunnel lining along the inner wall of an existing tunnel having an arcuate cross section. When lining the inner wall, the method of installing the curved plate on the tunnel foundation includes driving a large number of anchor bolts at intervals in the length direction of the tunnel at positions close to the inner wall of the tunnel foundation. Next, these anchor bolts are surrounded by a frame plate placed on the tunnel foundation, and a box-shaped formwork is set in the frame plate so as to fit into the inner edge of the frame plate. By covering the anchor bolts and then injecting and solidifying a filling and solidifying material such as mortar into the formwork and embedding the anchor bolts, the formwork and the filling and solidifying material, or by removing the formwork and only the filling and solidifying material. to form a kite protrusion along the length of the tunnel, and then position the curved plate relative to the tunnel base by fitting a guide recess formed in the grounding end surface of the curved plate to the tunnel base into the guide protrusion. It is characterized by the fact that

[Function] According to the method of installing a curved slab for tunnel lining on a tunnel foundation of the present invention, it is possible to easily and quickly position the curved slab with respect to the existing tunnel foundation with high precision. The construction period for lining will also be further shortened.

In addition, since the curved plate is positioned with high precision,
The posture of the lining body relative to the tunnel due to the entire curved slab is extremely good.

[Example] Reference numeral 1 in FIG. 1 indicates an existing tunnel having an arcuate cross section. This tunnel 1 is made by constructing a lining material 3 such as concrete on the inner wall 2a of an excavated hole 2 excavated in the ground G, but the lining material 3 is old and Figure 1 shows the inner wall 3a of this aged lining material 3,
A large number of upper curved plates 4 and lower curved plates 5 are assembled to the left and right with the top of the tunnel 1 as a boundary and are interconnected, and a gap 6 is formed between each of these curved plates 4.5 and the inner wall 3a. It shows a state where the lining has been repaired with mortar 7 injected into the roof.

The upper curved version 4 and the lower curved version 5 are formed of reinforced concrete into a circular arc shape curved along the cross-sectional curvature of the tunnel 1, and have the same appropriate width (length in the depth direction of the tunnel l). The length in the circumferential direction is set to about 1/2 of the length in the circumferential direction from the base 1a, which is the bottom surface of the tunnel 1, to the top.

First, the assembly structure of these curved plates 4.5 to the inner wall 3a will be explained.

At the positions where the lower curved plates 5 are installed on the base 1a on both sides of the tunnel 1, that is, at both ends of the base 1a in the width direction and close to the inner wall 3a at a predetermined distance, the lower curved plates 5 are installed at regular intervals in the length direction of the tunnel 1. An anchor bolt 8 is driven along the line, and on this anchor bolt 8,
A large number of kite projections 9 are provided.

As shown in FIG. 2, this guide protrusion 9 has a trapezoidal cross-sectional shape that narrows toward the upper end, and is formed by filling the formwork IO with a filling solidifying material 11 such as mortar, and has an appropriate length. It extends in the length direction of the tunnel 1. In this case, one guide projection 9 is provided for two anchor bolts 8.

On the other hand, a groove-shaped guide recess 12 that fits into the guide protrusion 9 is formed over the entire length of the grounding end surface 13 of the lower curved version 5 relative to the base 1a of the tunnel 1. This guide recess 12 has a trapezoidal cross section corresponding to the guide protrusion 9, is formed along the length direction of the ground end face 13 at the center in the width direction of the ground end face 13, and the guide protrusion 9 fits snugly into the guide recess 12. It looks like this.

By fitting the guide recess 12 into the guide protrusion 9, the lower curved plate 5 is installed on the base plate 1a.

On the other hand, as shown in FIGS. 3 and 4, an L-shaped reference metal fitting 14 is interposed in a portion of the lining material 3 close to the upper end of the lower curved plate 5, and a length reaching the ground G is provided. A plurality of lock bolts 15 having a diameter are driven in at regular intervals (a plurality for each lower curved plate 4) and are fixed with nuts 15a.

The reference fitting 14 consists of a base plate part 16 and a support plate part 17 which are brought into pressure contact with the inner wall 3a of the lining material 3 by a lock bolt 15. 17 is fixed along the longitudinal direction of the tunnel 1 to the inner wall 3a by lock bolts 15 and nuts 15a in a state along the radial direction of the inner wall 3a.

Also, as shown in FIGS. 3 and 4, the reference metal fitting 14 on the outer surface (convex side surface) 34 of the lower curved plate 5 installed on the base 1a by the guide protrusion 9 as described above is also shown in FIG. An elongated fixing metal fitting 19 having an angular cross-section and fixed to the reference metal fitting 14 is attached to the corresponding location so as to extend in the width direction of the lower curved plate 5.

This fixing fitting 19 has a length spanning the entire width of the lower curved version 5, and is composed of a base plate part 20 and a fixing plate part 21. With the fixing plate part 21 disposed below, the base plate part 20 is It is fixed to the outer surface 34 of the lower curved version 5 by a bolt 23 inserted into an insert fitting 22 embedded in the lower curved version 5. Note that a plurality of welding holes 24 are formed in the fixed plate part 21 at regular intervals, and a band-shaped sealing material 25 is pasted on both sides of the base plate part 20.

The fixing bracket 19 is configured such that the fixing plate portion 21 is installed in a state where the lower curved version 5 is installed along the inner wall 3a with a certain gap 6 between the base 1a and the inner wall 3a of the lining material 3. The inner edge of the welding hole 24 of the fixed plate part 21 and the support plate part 1 of the reference metal fitting 14 overlap on the support plate part 17 of the reference metal fitting 14.
7 are plug welded. Thereby, the lower curved version 5 is fixed to the inner wall 3 through the fixation between the reference metal fitting I4 and the fixing metal fitting 19.
It is assembled in a.

In the upper curved version 4 and the lower curved version 5, as shown in FIGS. 5 and 6, the joint end surfaces 26 and 27 of each other are
Fittings 28 and 29 that are to be joined to each other with these joint end surfaces 26 and 27 perfectly aligned are embedded in each, and inside these fittings 28 and 29, inner surfaces 30 and 18 of each curved plate 4.5 are embedded. There are recesses 31 and 32 for bolt fastening work that open to the
Mortar 7 leading from recess 31.32 to external surface 33.34
passages 35 and 36 are formed respectively. moreover,
Recesses 37.38 that coincide with each other and have a hemispherical shape are formed at the centers of the corners of each joint end surface 26.27 and the outer surface 33.34, respectively.

On the other hand, as shown in FIGS. 7 to 9, the joint ends of the upper curved plates 4, which serve as the connecting parts at the top of the tunnel 1, are formed in a symmetrical tapered shape with a triangular tip, so that the two joints End surfaces 39a and 39b are provided.

At the center in the thickness (height) direction of these joint end surfaces 39a and 39b, a groove 40a having a semicircular arc cross section along the length direction;
40b are formed respectively.

In addition, at the corner of each joint end surface 39a, 39b and the outer surface 33, at the center in the length direction of each joint end surface 39a, 39b,
Spherically depressed recesses 418 and 41b are formed.

Furthermore, an insert metal fitting 42 is embedded from the outer surface 33 side in a location close to the corner where the respective joint end surfaces 39a and 39b intersect, and a bolt 43 is screwed into this insert metal fitting 42.

The upper curved version 4 and lower curved version 5 having the above configuration are as follows:
As shown in FIGS. 3 to 6, mutual joint end surfaces 26
．． 27 are brought together, and the joint fittings 28 and 29 are connected by being fastened with bolts 44 and nuts 45. Note that a sealing material 46 covering the recess 37.38 is interposed between the joint end surface 26.27 and the recess 37.38.

Further, as shown in FIGS. 7 and 9, the upper curved plates 4 are brought into contact with only the joint end surfaces 39a and 39b, and in this state, both J40a and 40b are brought into contact with each other to form a cavity. The key 47 is fitted.

Then, the bolt 43 is pulled out from the insert fitting 42 by rotating it in the removal direction, and the bolt 43 is strongly pressed against the inner wall 3a of the lining material 3. As a result, the upper curved version 4 has an inner wall 3a
This reaction force is applied to the joint end surfaces 39a and 39b of the upper curved plates 4 and 4, and the joint end surfaces 26 and 27 of the upper curved plates 4 and the lower curved plate 5.
The wheels work to press against each other, and each curved plate 4
．． 5, a compressive force (axial force) acts in the circumferential direction. In addition, the 8th
As shown in the figure, the joint end surface 39a between the upper curved plates 4
, 39b, a sealing material 48 covering the recesses 41a and 41b is interposed.

In this embodiment, the upper curved plates 4 are connected to each other by the joint end surface 3.
In order to fit the 9a and 39b together, either a connecting body consisting of the upper curved plate 4 and the lower curved plate 5 on the left side and a connecting body consisting of the upper curved plate 4 and the lower curved plate 5 on the right side, or the curved plate 4 (5
) is installed on the base la with a deviation of 1/2 of the width,
One semicircular arch 49 is configured. By sequentially connecting these arches 49, the entire inner wall 3a is lined.

The connection structure between the arches 49 is as follows.

As shown in FIG. 10, the upper curved version 4 and the lower curved version 5 have an appropriate number of bolt holes 50 that are continuous with each other when assembled to the inner wall 3a as described above along the width direction. It is formed through. A recess 52 with a counterbore 51 formed in the back is provided at both end openings of the bolt through hole 50.
It is formed coaxially with the bolt through hole 50.

A connecting rod 53, which is slightly shorter than the width of the curved version 4 (5) and has threaded parts 53a and 53b formed at both ends, is inserted into the bolt through hole 50, and the threaded parts 53a and 53b at both ends are inserted into the recesses 52 on both sides.
It is passed in a state where it is located inside. The threaded portion 53a on one end side of one of the curved plates 4(5) to be connected is provided with a cylindrical connecting portion extending over the recesses 52 of both the curved plates 4(5) to be connected to each other.

It is screwed in through the groove 54 or the groove 55 applied to the seat surface 51a of the counterbore portion 51.

Further, a normal NAND 56 is attached to the threaded portion 53b on the other end side of the connecting rod 53 passed through the bolt through hole 50 of the other curved plate 4 (5) to be connected, and this threaded portion 5
3b is screwed into the connecting nut 54.

In this way, the connecting nut 54 is fastened to the threaded portion 53a at one end of the connecting rod 53 passed through the bolt through hole 5o,
The curved plate 4 (5) to be connected next to this connecting nut 54
The threaded portion 53b at the other end of the connecting rod 53 passed through the bolt through hole 5o is screwed into the connecting nut 54, making it continuous (thereby, the length of the arches 49, that is, the length of the tunnel 1) is screwed into the connecting nut 54. Curved plates 4 (5) adjacent in the direction are connected with their joint end surfaces 62 aligned.

Then, mortar 7 is injected and filled into the gap 6 between the upper curved version 4 and the lower curved version 5 and the inner wall 3a of the lining material 3, and finally the lining of the inner wall 3a is completed. In this case, as shown in FIG. 1, the mortar 7 is at the level up to the middle of the lower curved version 5 shown in the first stage A, and between the upper curved version 4 and the lower curved version 5 shown in the second stage 2B. Injection and solidification are repeated in this order: to the level just below the joint, in the third stage, to the level immediately above the joint, and in the fourth stage to the top. Furthermore, the mortar 7 injected inside the joint between the upper curved version 4 and the lower curved version 5 (between B level and C level)
In order to increase the mutual connection strength between the upper curved version 4 and the lower curved version 5, non-shrinkage mortar having a higher specific gravity than normal mortar is used.

When pouring the mortar 7 in this way,
As shown in FIG. 6 and FIG.
．． 32 is covered and closed off with a closing plate 57 in advance.

This closing plate 57 is used to roughly tighten the joint fittings 28 and 29 when fastening the fittings 28 and 29 with bolts 44 and nuts 45.
．． It can be fixed with a nut 60 to a screw 59 that is welded to an L-shaped fitting 58 collinear with 29 and projects inside the curved plate 4 (5).

When the mortar 7 is injected into the gap 6 as described above with the recesses 31 and 32 being closed by the closing plate 57,
The mortar 7 is filled into the recess 32 of the lower curved version 5 and the recess 31 of the upper curved version 4 through a passage 36 leading from the recess 32 of the lower curved version 5 to the outer surface 34, and then filled into the recess of the upper curved version 4. A passageway 35 leading from 32 to outer surface 33 is filled.

After the mortar 7 has solidified, the recesses 31 and 32 are formed by removing the nand 60, removing the closing plate 57, and cutting the protruding portions of the screws 59. The mortar 7 is embedded flush with the mortar 18.

As described above, a large number of upper curved plates 4 and lower curved plates 5 are created.
Thus, the inner wall 3a of the lining material 3 in the tunnel I is lined.

Next, as described above, a large number of upper curved plates 4 and lower curved plates 5 are prepared.
I will explain how to assemble it.

First, a method of installing the lower curved version 4 on the base 1a of the tunnel 1 according to the present invention will be explained.

As shown in FIGS. 2 and 11, at a position where the lower curved version 5 of the base 1a, which has been smoothed to a certain standard, is installed, the head 6a of the base 1a is placed at a constant interval in the length direction of the tunnel l. The anchor bolts 6 are driven over the entire length of the tunnel 1 so that they protrude above the base la.

Next, as shown in FIG. 11, these anchor bolts 8 are surrounded by a frame 61 installed in a plurality of sets (in this case, two sets) on the base 1a. This frame body 61 is a rectangular plate material having an appropriate thickness with a rectangular inner cavity 61a bored inside, and anchor bolts 8 are inserted into the base 1a from inner edges 61b on both ends in the longitudinal direction. The distances from the inner edges 61b on both ends in the width direction are also equal to each other.

Next, as shown in FIG. 12, the formwork 10 formed in the shape of a hollow box with a trapezoidal cross section is set in each frame 61 installed on the base la to cover the anchor hole 8. This formwork 10 has dimensions that fit into the inner edge 61b of the frame body 61 on the bottom surface with a larger area, and fit perfectly into the inner cavity 61a.
Its height is set to be higher than the driven anchor bolt 8, and the bottom surface is placed on the base 1a and set in the inner hollow part 61a of the frame 61.

In addition, in the upper part of the formwork 10, there is an injection port 1 for filling and solidifying material 11.
0a or multiple holes (in this case two, one of which is used as an air vent).

Once the formwork 10 is set inside each frame body 61 as described above,
A filling solidifying material 11 such as mortar is injected into these formworks 10 from one injection port 10a, and anchor bolts 8 are embedded. When the filling and solidifying material 11 solidifies, a long guide protrusion 9 is formed along the length of the tunnel 1 made of the formwork 10 and the filling and solidifying material 11 inside thereof, as shown in FIG. , a large number are obtained over the entire length of the tunnel l.

Then, the lower curved plate 5 is supported on the clay 7 shown in FIG. 1, and its posture is controlled so that it follows the inner wall 3a of the lining material 3. The material 3 is brought closer to the inner wall 3a, and the guide recess 12 formed in the grounding end surface 13 is fitted into the guide protrusion 9. The position of the guide protrusion 9 with respect to the base 1a is set in advance so that the gap 6 between the inner wall 3a and the lower curved version 5 is a predetermined distance when the kite recess 12 is fitted. The lower curved plates 5 are arranged on the left and right sides of the base 1a, or one of the lower curved plates 5 on either the left or right is installed aligned with the end of the inner wall 3a, and the other lower curved plate 5 is placed along the width thereof. Place it at a position shifted by 1/2 distance.

As described above, by fitting the guide recess 12 into the guide protrusion 9 and installing the lower curved version 5 on the base 1a, the lower curved version 5 can be stacked and positioned well in the width direction of the base 1a. It can be done easily and in a short time. By achieving high precision positioning in this way, the upper curved plate 4 connected to the upper part can be reliably located, and the lining of the tunnel l formed by connecting a large number of both curved plates 4 and 5 can be achieved. The bodies are arranged closely along the length of the tunnel l. In addition, the distance between both curved plates 4.5 and the inner wall 3a of the lining material 3 (gap 6) is also constant, so that the pressure of mortar 7 injected into the gap 6 and applied to both curved plates 4.5 is uniform in the length direction of the tunnel 1.

Note that the guide protrusion 9 is formed by filling and solidifying material 1 into the formwork 10.
1 or filled, as shown in Figure 14, the formwork 1
0 and the guide protrusion 9 with only the filling and solidifying material 11 removed.
You can also use it as At this time, it is necessary to match the dimensions of the guide recess 12 formed in the ground end surface 13 of the lower curved version 5 to the guide protrusion 9.

The lower curved plate 5 installed on the base 1a in this way is attached to the inner wall 3.
To fix it to a, as shown in Fig.
The fixing plate part 21 of 9 is connected to the support plate part 17 of the plurality of reference fittings 14.
and the inner edge of the welding hole 24 of the fixing plate part 22 and the support plate part 17 are plug-welded. As a result, the reference metal fitting 14
and the fixing fittings 21 are fixed, and the lower curved version 5 is attached to the lining material 3.
It is assembled to the inner wall 3a of.

Next, the upper curved version 4 is supported by a crane, and its posture is controlled so that it follows the inner wall 3a of the lining material 3, and then the lower curved version 5 is placed on the inner wall above the lower curved version 5, which is installed on the end side of the inner wall 3a. 3a, the joint end surface 26 of the upper curved version 4 is exactly aligned with the joint end surface 27 of the lower curved version 5, and the joint fittings 28, 29 are fastened together with bolts 44 and nuts 45.

At this time, the L-shaped metal fittings 58 for fixing the closing plate 57 are aligned. At this point, the upper curved plate 4 still needs to be supported by a crane.

Next, the upper curved version 4 is brought close above the lower curved version 5 on the opposite side, the joining end surface 26 is aligned with the joining end surface 27 of the lower curved version 5, and the joining end surfaces 39 a (
39b) Match them together. At this time, the +-〇 slot 47 is fitted in advance into the groove 40a (40b) of the joint end surface 39a (39b) of the existing upper curved version 4 on the side to be matched, and the joint end surface 39a ( 3
The groove 40a (40b) of 9b) is fitted into the key rod 47, and a 7-ru material 48 is attached to the joint end surface 39a (39b).

Then, in the same manner as described above, the joint fittings 28 and 29 are fastened together with the bolts 44 and 45 to connect the upper curved version 4 and the lower curved version 5. Moreover, the joint end surface 39a (
39b) By being butted against each other,
Both sides support each other, and the bolt 43 is removed from the insert fitting 42 by rotating it in the direction of removal.
3 is firmly pressed against the inner wall 3a of the lining material 3. As a result, a compressive force (axial force) acts on each curved plate 4.5 in the circumferential direction as described above, and the connected state is maintained.

After one arch 49 is assembled to the inner wall 3a in this way, the lower curved version 5 to be assembled next is replaced with the existing lower curved version 5.
The lower curved plates 5 are assembled next to each other in the same manner as described above, and the adjacent lower curved plates 5 are further connected to each other.

To connect the lower curved plate 5 and the screw, as shown in Fig. 1O, insert the connecting rod 53 through the Holt through hole 50 of the existing lower curved plate 5 and attach the threaded part 53b to the tip side. Then, the connecting rod 53 is fixed by screwing the connecting nut 54 into the threaded portion 53a on the other end side. And this connecting nut 54
A new connecting rod 53 is screwed into the connecting rod 53, and while passing through the bolt through hole 50 of the lower curved plate 5 to be newly connected, the lower curved plate 5 is inserted into the existing lower curved plate 5.
Match. Next, the connecting nut 54 is screwed into the newly screwed threaded portion 53a of the connecting rod 53 via the shear 55. Adjacent lower curved plates 5 are connected to each other by the tightening force of this connection plate 54.

As described above, the lower curved plates 5 are installed on the base 1a and assembled to the inner wall 3, the lower curved plates 5 are connected to each other, the upper curved plates 4 are connected to the lower curved plate 5, and the upper curved plates 4 are connected to each other. are sequentially performed to line the inner wall 3a of the lining material 3 in the tunnel 1 with a large number of curved plates 4.5.

When this lining is completed, as shown in Figure 3, etc., the recess 3
1.32 with the closing plate 57, mortar 7 is placed in the gap 6 between the curved plate 4.5 and the inner wall 3a as described above.
Fill it up. Once the mortar 7 has solidified, the closing plate 57
is removed, and the lining of the inner wall 3 is finally completed.

According to this method of assembling each curved version 4.5, when assembling a new upper curved version 4, the existing upper curved version 4
Since the upper curved plates 4 and 5 are supported in sequence, there is no need for equipment such as supports to temporarily maintain the posture of the upper curved plates 4, and each curved plate 4.5 can be assembled efficiently and in a short period of time. .

In addition, as described above, since the lower curved plate 5 is positioned and installed with high precision with respect to the base 1a, it becomes a reliable base for the upper curved plate 4, and this upper curved plate 4
Assembling can be done naturally and accurately.

[Effects of the Invention] As explained above, according to the method of installing a curved slab for tunnel lining on a tunnel foundation of the present invention, it is possible to easily and quickly position a curved slab with high precision with respect to an existing tunnel foundation. This can be done in a short amount of time, thereby further shortening the construction period required for lining.In addition, since the curved slab can be positioned with high precision, the posture of the lining body relative to the tunnel can be determined by the entire curved slab. The effect is that it becomes extremely good.

[Brief explanation of drawings]

Figures 1 to 14 are diagrams showing an embodiment of the present invention, in which Figure 1 is a front cross-sectional view of an existing tunnel that has been lined and repaired according to the present invention, and Figure 2 is a lower curved section. A front sectional view showing the installation structure of the plate, Figure 3 is a front sectional view showing the connection structure of the upper curved plate and the lower curved plate, and Figure 4 is a front sectional view of the main part showing the fixing structure of the lower curved plate to the inner wall. Figure 5 is the third
Figure 6 is an enlarged front cross-sectional view of the main part of the connecting structure between the upper curved plate and the lower curved plate. Figure 7 is a front cross-sectional view showing the connecting structure between the upper curved plates. Figure 8 is a partial perspective view of the upper curved version, Figure 9 is a view in the ■ direction of Figure 1,
Figure 0 is a sectional view showing the connection structure of the upper curved version and the lower curved version that are adjacent to each other in the length direction of the tunnel, and Figures 1t to 1
FIG. 3 is a perspective view showing the procedure for installing the lower curved version on the tunnel foundation, and FIG. 14 is a perspective view showing an example of the guide protrusion pond. ■ ・Tunnel, 1a... Foundation, 3a...
...Inner wall, 4...Top curved version, 5...Bottom curved version, 8...Anchor bolt, 9...
- Guide protrusion, 10... Eyes... Formwork, 11-... Filling and solidifying material, I2... Guide recess. Applicant: Ishikawajima Kenzai Kogyo Co., Ltd. Figure 2 Figure 3 Figure 131+ Figure 14

Claims (1)

[Claims] In a method for installing a plurality of curved plates for tunnel lining along an inner wall of an existing tunnel having an arcuate cross-sectional shape to line the inner wall, installing the curved plates on a tunnel foundation, the tunnel A large number of anchor bolts are driven at intervals in the length direction of the tunnel at positions close to the inner wall of the base, and then these anchor bolts are surrounded by a frame plate placed on the tunnel base, and within this frame plate, A box-shaped formwork is set so as to fit into the inner edge of the frame plate, and the anchor bolt is covered with the formwork, and then a filling and solidifying material such as mortar is injected into the formwork and solidified. By embedding the anchor bolts, guide protrusions along the length of the tunnel are formed using the formwork and the filling and solidifying material, or by removing the formwork and using only the filling and solidifying material, and then the tunnel base of the curved version is formed. A method for installing a curved slab for tunnel lining on a tunnel foundation of an existing tunnel, characterized in that the curved slab is positioned with respect to the tunnel foundation by fitting a guide recess formed in a grounding end surface to the guide protrusion.