JP3519378B2 - Retaining wall structure and members for retaining wall construction in the observer passage in the tunnel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall structure for an observer passage installed in a tunnel.

[0002]

2. Description of the Related Art In a tunnel, a guardian passage is installed along the side wall of the tunnel in order to regularly monitor changes in the characteristics of the tunnel and determine whether reinforcement or improvement work is necessary. Some of these guard passages are installed at a low position near the road surface, and some are installed at a higher position than the road surface.

As shown in FIG. 8, in a guardian passage installed at a position higher than the road surface, a formwork is assembled on the upper surface side of the foundation concrete 1 and the internal space of the formwork in which the required reinforcing bars are incorporated. Between the rear side of the bottom slab 3 of the retaining wall 2 and the tunnel side wall, fresh concrete is poured into the concrete to form the retaining wall 2 rising from the road surface 15, and the mold is removed after the concrete is cured. Pour fresh concrete into the empty space to form the extension extension part 4 of the bottom slab 3,
A backfill material 6 such as sand is filled in a space surrounded by the retaining wall portion 2, the bottom slab portion 3, the extension joint portion 4 and the tunnel side wall 5, and fresh concrete is placed on the upper surface portion of the backfill material 6. And forms a walking road surface 7 for the observer. And
In order to improve the visual environment in the tunnel and allow the driver to easily determine the tunnel wall surface position, the retaining wall portion 2
The tile for the tunnel interior is put on the front side of the.

[0004] In the conventional observer passage in the tunnel constructed as described above, the steps of assembling the formwork and the rebar, placing and curing the cast-in-place concrete, demolding and tiling at the construction site are performed at the construction site. There are so many, and the construction period becomes longer accordingly. Further, regarding the retaining wall portion and the road 15, the gutter 8 having the circular water channel 9 in consideration of the longitudinal load of the vehicle is formed.
It is necessary to install drainage from the road surface and to treat spring water from the side wall of the tunnel, and the installation of this gutter 8 is a factor that greatly increases the construction cost. Further, since the tunnel cross section is enlarged by the width of the gutter 8, the construction cost is further increased.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to accurately perform drainage from a road surface and drainage of spring water from a side wall of a tunnel without having to increase a section of the tunnel, and it is possible to reduce construction cost. It is to provide a retaining wall structure for a guardian passage in a tunnel. Another object of the present invention is to provide a member for forming a retaining wall of a guardian passage in a tunnel, which can reduce the number of on-site processes as much as possible and greatly shorten the construction period.

[0006]

In the retaining wall structure for a guardian passage in a tunnel according to the invention of claim 1, the retaining wall 10 installed along the tunnel side wall 12 has a standing wall portion 11 that rises higher than a road surface 15. And a bottom wall portion 13 projecting toward the tunnel side wall 12 toward the lower rear surface of the standing wall portion 11, and a water channel 14 is formed through the bottom wall portion 13 in the longitudinal direction to form a road surface. The road surface drainage water guiding hole 16 for guiding the drainage from the water channel 15 to the waterway 14 is opened to the upper front side of the bottom wall portion 13, and the waterway water guiding hole 17 for guiding the springwater from the tunnel side wall 12 to the waterway 14. Open on the upper surface side of the bottom wall portion 13,
A space between the retaining wall 10 and the tunnel side wall 12 is filled with a required backfill material 19, and a guard passage 20 is formed on the upper surface of the backfill material 19.

In the retaining wall constituting member of the observer passage in the tunnel according to the second aspect of the present invention, the retaining wall 10 installed along the tunnel side wall 12 is provided with a standing wall portion 11 that rises higher than the road surface.
And a bottom wall portion 13 formed so as to project toward the lower wall surface of the standing wall portion 11 toward the tunnel side wall 12.
3 is formed by penetrating the waterway 14 in the longitudinal direction,
Water drainage hole 1 for leading the drainage from the road to the waterway 14
6 is opened on the upper front side of the bottom wall portion 13, and a water guiding hole 1 for spring water for guiding the spring water from the tunnel side wall 12 to the water channel 14 is formed.
7 is opened on the upper surface side of the bottom wall portion 13, and the standing wall portion 11 and the bottom wall portion 13 of the retaining wall 10 are integrally precast.

[0008]

According to the first aspect of the present invention, the retaining wall 10 is constructed of cast-in-place concrete along the tunnel side wall 12 at a constant distance from the tunnel side wall 12. A vacant space between the retaining wall 10 and the tunnel side wall 12 that rises to a predetermined height from the road surface 15 is filled with a backfill material 19 such as sand, and the upper surface portion of the compacted backfill material layer is an observer. Passage 2
0 is formed by cast-in-place concrete. Rainwater blown into the road surface 15 from the entrance / exit of the tunnel flows into the water channel 14 of the bottom wall portion 13 via the road surface drainage water guiding hole 16. Further, the spring water from the inner wall 12 of the tunnel and the rain water blown into the observer passage 20 from the entrance / exit of the tunnel permeate the inside of the packed layer of the backfill material 19 and the water introducing hole 1 for the spring water.
7 and flows into the water channel 14 from the water guide hole 17. Since this waterway 14 is connected to the drainage path installed outside the tunnel, the road surface drainage and the spring water removal processing can be performed without any trouble.

According to the second aspect of the present invention , the retaining wall constituting member of the precast concrete product molded in the factory is transported to the construction site, and along the tunnel side wall 12 with a certain distance from the tunnel side wall 12. Retaining wall 1 that is installed sequentially and is joined and connected to each other by appropriate means such as bolt tightening, and rises to a predetermined height from road surface 15.
0 is constructed. The backfill material 19 such as sand filled in the space between the retaining wall 10 and the tunnel side wall 12 is compacted, and the observer passage 20 is formed by cast-in-place concrete on the upper surface portion of the backfill material layer. The rainwater blown into the road surface 15 flows into the waterway 14 via the water drainage holes 16 for road surface drainage, and the spring water from the tunnel inner wall 12 and the rainwater blown into the observer passage 20 penetrate the backfill material layer. And flows into the water channel 14 from the spring water guiding hole 17, and flows out to the drainage channel outside the tunnel connected to the water channel 14.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the illustrated embodiment, a retaining wall forming member precast at the factory is installed on the upper surface of the foundation concrete 23. At the front and rear joint ends of this member, a bolting joint metal is embedded at the time of molding. That is, a rectangular recess 24 that opens to the back side is formed at the joining end, a U-shaped joining hardware 25 is arranged in the rectangular depression 24, and the anchor rebar 29 welded to the joining metal 25 is the standing wall portion. It's getting into 11. Joining hardware 25
A through hole 28 is formed in the central plate portion of the
Adjacent to the retaining wall constituting members, which are laid by abutting 0a, 10b, are bolts 26 and nuts 27 that pass through the through holes 28.
Are clamped and fixed to each other.

The joint wall 10a, 10b has a standing wall 1
1 and the bottom wall portion 13 are formed in a vertical direction, and a linear sealing receiving groove 30 and a circular sealing receiving groove 31 surrounding the opening edge portion of the water channel 14 are formed. These receiving grooves 30, 3
The seal member such as butyl rubber attached to No. 1 is pressed at the time of the above-mentioned bolt tightening, whereby a joint having excellent watertightness is made. The water channel 14 formed in the bottom wall portion 13 of the retaining wall constituting member is circular, the road surface drainage water guiding hole 16 is formed in a downward slope toward the water channel 14, and the spring water guiding hole 17 is formed in the standing wall portion 11. Is formed vertically at a position close to. Between the bottom wall portion 13 and the lower portion of the tunnel side wall 12, an extension joint portion 22 of the bottom wall portion 13 is formed by cast-in-place concrete. In order to integrate with the cast-in-place concrete, a plurality of dowel reinforcements 21 are provided on the back side of the bottom wall 13 so as to project.

When forming the extension joint portion 22 of the bottom wall portion 13, since the bottom wall portion itself plays a role of a mold, troublesome assembly and demolding work of the mold is unnecessary. After filling sand in the space between the tunnel side wall 12 and the retaining wall 10 as the backfill material 19 and compacting it, the observer passage 20 is formed by cast-in-place concrete on the upper surface of the backfill material layer. Even at this time, since the upper end portion of the standing wall portion 11 plays a role of a mold, troublesome assembly and demolding work of the mold are unnecessary. Further, since the dowel reinforcement 21 is arranged on the bottom wall at the factory stage, the work of assembling the reinforcement on site is eliminated. The upper wall of the standing wall 11 is formed with a receiving hole 33 into which the pillar 32 of the handrail is inserted. An apron block 34 is installed between the road 15 and the lower part of the retaining wall 10, and the above-mentioned road surface drainage water guiding hole 16 is opened on the upper surface side of the apron block 34. A lifting receiver 35 is embedded in the central portion of the upper surface of the bottom wall portion 13 during transportation and construction.

Also, the interior tile 18 for the tunnel is
Work environment if it is attached at the factory stage of cast molding
It is possible to omit the tiling process at the construction site where the
It is possible to shorten the construction period and save the construction cost. For interior
Ile 18 is indirectly attached via an appropriate mounting jig.
Or glued directly with an adhesive. This
The interior tile 18 for the tunnel is designed to improve the visual environment inside the tunnel.
Good and make it easier to recognize the tunnel wall surface position.

[0014]

According to the invention of claim 1, the retaining wall 10 is composed of the upright wall portion 11 and the bottom wall portion 13 projectingly formed on the lower rear surface side of the upright wall portion 11, and the bottom wall portion 13 has a water channel. 14, the drainage water guide hole 16 from the road surface 15 is opened to the upper front side of the bottom wall portion 13, and the spring water guide hole 17 from the tunnel side wall 12 is opened to the upper surface side of the bottom wall portion 13. Therefore, the tunnel cross section can be set to a necessary minimum as compared with the conventional structure in which a gutter is separately installed on the lower front surface side of the retaining wall. That is, drainage from the road surface and removal of spring water from the side wall of the tunnel can be accurately performed without the need to increase the section of the tunnel, and the construction cost can be reduced. Also,
As described above, the water channel 14 is formed in the bottom wall portion 13,
Since the weight of the vehicle is not loaded on the bottom wall portion 13, the thickness of the bottom wall portion 13 can be designed to be small, and the material cost can be reduced.

According to the second aspect of the present invention, the retaining wall 10 is composed of the standing wall portion 11 and the bottom wall portion 13 projectingly formed on the lower rear surface side of the standing wall portion 11, and the water channel 14 is formed in the bottom wall portion 13. Then, the drainage water guide hole 16 from the road surface 15 is opened to the upper front side of the bottom wall portion 13, and the spring water guide hole 17 from the tunnel side wall 12 is opened to the upper surface side of the bottom wall portion 13. Since the standing wall portion 11 and the bottom wall portion 13 of the wall 10 are integrally precast and formed into a retaining wall constituent member, the work of assembling the formwork and the reinforcing bar at the construction site can be greatly saved, and the construction period can be shortened. It is possible to reduce construction costs. Further, since the thickness of the bottom wall portion 13 which is not loaded with the vehicle weight can be reduced, the overall weight can be reduced and the transportation cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a tunnel to which a retaining wall structure for an observer passage in a tunnel according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged perspective view of a main part of the retaining wall structure of FIG.

FIG. 3 is a perspective view from the front side of a retaining wall constituent member used in the retaining wall structure of FIG.

FIG. 4 is a perspective view from the back side of the retaining wall constituting member used in the retaining wall structure of FIG.

5 is a perspective view of a bolted joint portion of a retaining wall constituting member used in the retaining wall structure of FIG. 1. FIG.

6 is a perspective view of a metal joint used for the bolted joint of FIG. 5. FIG.

FIG. 7 is a central vertical cross-sectional view of a retaining wall constituting member used in the retaining wall structure of FIG.

FIG. 8 is an enlarged perspective view of a main part showing a retaining wall structure of a conventional observer passage in a tunnel.

[Explanation of symbols]

10 retaining wall 11 Retaining wall standing wall 12 Tunnel side wall 13 Bottom wall of retaining wall 14 waterways 15 Road surface 16 Road surface drainage holes 17 Water transfer hole for spring water 18 Interior tiles for tunnels 19 Backfill material 20 Observer passage

Continuation of the front page (56) Reference JP-A-11-50796 (JP, A) Actual development Sho 58-140286 (JP, U) Registered utility model 3012493 (JP, U) (58) Fields investigated (Int.Cl) . ⁷ , DB name) E21F 17/00 E02D 29/02 305 E21F 16/02 E01C 11/22

Claims (2)

(57) [Claims] 1. A standing wall portion 11 which rises a retaining wall 10 installed along a tunnel side wall 12 higher than a road surface 15.
And a bottom wall portion 13 formed so as to project toward the lower wall surface of the standing wall portion 11 toward the tunnel side wall 12.
3 is formed by penetrating the waterway 14 in the longitudinal direction,
Water drainage hole 1 for leading the drainage from the road to the waterway 14
6 is opened on the upper front side of the bottom wall portion 13, and a water guiding hole 1 for spring water for guiding the spring water from the tunnel side wall 12 to the water channel 14 is formed.
7 is opened on the upper surface side of the bottom wall portion 13, a required backfilling material 19 is filled in the space between the retaining wall 10 and the tunnel side wall 12, and a guardian passage 20 is formed on the upper surface portion of the backfilling material 19. The retaining wall structure for the guardian passage in the tunnel. 2. The retaining wall 10 installed along the tunnel side wall 12 is a standing wall portion 11 that rises higher than the road surface 15.
And a bottom wall portion 13 formed so as to project toward the lower wall surface of the standing wall portion 11 toward the tunnel side wall 12.
3 is formed by penetrating the waterway 14 in the longitudinal direction,
Water drainage hole 1 for leading the drainage from the road to the waterway 14
6 is opened on the upper front side of the bottom wall portion 13, and a water guiding hole 1 for spring water for guiding the spring water from the tunnel side wall 12 to the water channel 14 is formed.
A member for forming a retaining wall of a surveillance member passage in a tunnel, in which 7 is opened on the upper surface side of the bottom wall portion 13, and the standing wall portion 11 and the bottom wall portion 13 of the retaining wall 10 are integrally precast.