JP3366580B2 - How to install an invert in the bottom of an existing mountain tunnel - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for installing an invert in the bottom of an existing mountain tunnel.

[0002]

2. Description of the Related Art When a swelling occurs in an existing mountain tunnel used for general traffic, the place where the swelling occurs or its vicinity is used to reinforce the bottom of the mountain tunnel. It has been practiced to excavate all over the width direction and to install inverts at the excavation marks on both sides of the lining of the mountain tunnel.

However, this method has a problem that the general traffic in the mountain tunnel is obstructed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for installing an invert in the bottom of an existing mountain tunnel without interrupting general traffic.

[0005]

According to the present invention, a pit extending in the extension direction is formed in the center of the existing mountain tunnel in the width direction, and the center of the invert is formed in the pit. , About one half portion and the other half portion in the width direction of the bottom plate, in order, the excavation of a part in the extension direction of the bottom plate, the central portion of the invert to the excavation mark and the side wall of the lining It includes performing a step of forming each end and backfilling the excavation mark. Further, before the excavation of a part of the bottom plate in the extension direction, a drainage perforated pipe can be installed above the central portion of the invert in the mine.

[0006]

According to the present invention, when installing the invert, first, the central portion thereof is formed, and then both end portions thereof are sequentially formed. Since the central part of the invert is formed in the pit provided in the bottom of the existing mountain tunnel, the bottom can be used for general traffic during this period. Regarding the formation of both end portions of the invert, one half and the other half in the width direction of the bottom plate are sequentially excavated in a part in the extension direction of the bottom plate, and the center portion of the invert and the mountain tunnel are left in the excavation mark. Since each end of the invert that is connected to each side wall of the lining is formed and the excavation mark is backfilled, one side on the bottom plate may be used for general traffic during formation of one end of the invert. In addition, during formation of the other end of the invert, one side of the one end of the previously formed invert defined by the backfill material can be used for general traffic. Therefore, according to the present invention, the invert can be installed without blocking general traffic. By installing the drainage perforated pipe, a part of the existing drainage perforated pipe that is crushed during the formation of the pit can be restored.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIG. 1, an existing mountain tunnel provided for general traffic, to which the present invention is applied, is indicated generally by the reference numeral 10.

A mountain tunnel (hereinafter abbreviated as "tunnel") 10 is a horseshoe-shaped lining 12 and a bottom plate 14 (FIG. 2), more specifically, a bottom plate, which defines a passage for people and vehicles. It has a roadbed and a pavement (hereinafter, simply referred to as “pavement”) 16 formed on 14. Tunnel 10
Further, there are two inverts 20 provided in the bottom plate 14 under the both pit mouths and connected to both side portions 18 of the lining 12 facing each other. The illustrated invert 20 is made of concrete.

The bottom plate 14 of the tunnel 10 in service is
Blisters (not shown) may occur at one or more of the locations. In such a case, according to the present invention, by installing an invert 22 (see FIG. 8) in the bottom plate 14 below or near the location where the board blistering occurs, the location where the board blistering occurs and the vicinity thereof are set. The bottom board 14 can be reinforced. The invert 22 is installed as follows.

First, a pit 24 is formed in the bottom plate 14 (FIGS. 1 and 2). The pit 24 is located in the center portion of the bottom plate 14 in the width direction (transverse direction of the tunnel 10), and thus the pavement 16
Extends under the center line of the road in the tunnel 10 defined by the above in the extension direction (axial direction of the tunnel 10). Pit 24
Has a size such that an operator or a device can perform the installation work of the invert 22 inside.

The pit 24 extends from below one of the pits of the tunnel 10 to a place where the invert 22 needs to be installed, that is, a place where the swelling occurs or a vicinity thereof. Therefore, when there are a plurality of locations where the swelling occurs in the axial direction of the tunnel 10, the tip (end) of the pit 24 is located at the location closest to the other pit mouth of the tunnel 10 or under the vicinity thereof.

In the mine 24, for example, the bottom plate 14 is excavated by using an excavator such as a rock drilling machine, and a support 26 having a rectangular cross-sectional shape is arranged so as to cover the ground in the excavation trace. To be formed. The cross sectional shape of the support 26 is
Besides the rectangle, it may be circular, for example.

The existing invert 20 arranged at one of the tunnel entrances of the tunnel 10 is partially crushed by the excavator when the pit 24 is formed, but can be repaired later.

The road defined by the pavement 16 in the tunnel 10 may be used for general traffic during the formation of the pit 24, and later during the formation of the central portion of the invert 22 which will occur within the pit 24.

The starting point of the excavation for forming the pit 24 does not interfere with the traffic on the road passing through the tunnel 10 and the external road 28 connected to the external road 2.
It is desirable to use the ground on the side of 8 (see Fig. 1).

After the pit 24 is formed, a part of the invert 22, that is, one of the bottom portions 30 of the tunnel lining 12 is lowered toward the other in the pit 24 below or near the place where the blistering occurs. A central part (central part) 32 extending in a convex shape is formed (FIG. 3).

In order to form the central portion 32, a concrete 34 for filling the space which extends in the longitudinal direction is placed in the lower part of the pit 24. It should be noted that the existing invert 20 that was crushed when the pit 24 was formed by placing the filling concrete 34
Can be repaired by filling a part of

After the filling concrete 34 is solidified, a formwork (not shown) extending in the transverse direction of the pit 24 is arranged on the concrete and the concrete is placed in the formwork.
The solidified material of this cast concrete is the central part 3 of the invert.
Make two.

Thereafter, a drainage perforated pipe 36 extending in the axial direction of the tunnel 10 is installed on the central portion 32 of the invert. This perforated pipe 36 is installed to supplement a part of the existing perforated pipe (not shown) that was removed during the formation of the pit 24. Therefore, both ends of the perforated pipe 36 are , At the tip of the pit 24 and at the one pit mouth, connected to the remaining part of the existing perforated pipe.

Further, for example, a large number of crushed stones 38 are arranged around the perforated pipe 36, and the perforated pipe 36 is surrounded by the crushed stone 38. This ensures water flow to the perforated pipe 46 through the large number of crushed stones 38. In order to arrange the crushed stones 38 and prevent the crushed stones 38 from collapsing after the arrangement, it is desirable to temporarily dispose a pair of plate members 40 facing each other on both sides of the perforated pipe 36.

Next, both ends of the central portion 32 of the invert,
Both ends 42, 44 (see FIG. 7) of the invert which are continuous with the bottoms 30 of the both side walls 18 of the lining 12 are sequentially formed.

As shown in FIG. 4, first, in order to form one end portion 42 of the invert, a half portion of the bottom plate 14 in the width direction, that is, a portion from the center line of the road to one shoulder of the road is formed. The one side 46 and a part of the bottom portion 30 of one side wall are provided with an appropriate section (preferably the invert 22 as in the illustrated example) with respect to the extending direction of the bottom plate 14.
Approximately equal to the width dimension of the)), using a trencher, rock drill, backhoe, etc. This allows
One side 46 of the road is cut into a groove, and a part of the bottom portion 30 of one side wall of the lining 12 is exposed. It is desirable that the excavation mark 48 substantially matches the curved surface shape of the bottom surface of the one end portion 42 of the invert 22.

The other side 50 of the road can be used for general traffic during the excavation of one side 46 and the subsequent formation of one end 42 of the invert.

After excavation, a part 51 of the support structure 26 defining the mine 24 is cut and removed, and a part of the surface of the central portion 32 of the invert and one end surface thereof and half of the top surface of the crushed stones 38 are stacked. And one plate member 40 for preventing the crushed stone 38 from collapsing (FIG. 5).

Next, concrete of hard kneading is cast on the excavation mark 48, and the surface is finished to be a curved surface by trowel coating. As a result, an end portion 42 of the invert that is continuous with the central portion 32 of the invert at its one end surface and is continuous with the bottom portion 30 of the side wall 18 of the lining is formed.

Thereafter, a part of the central portion 32 of the invert and the space above the one end portion 42 of the invert are backfilled with a backfilling material 52 such as earth and sand or concrete (FIG. 6). Preferably, prior to this backfilling, further crushed stones are piled up on the crushed stones 38 filling the space around the perforated pipe 36 so that they reach the original height level of the pavement 16. For this stacking, the plate member 40 is replaced with a plate member 54 having a larger length dimension.

Thereafter, a part of the back surface of the backfill material 52 and the crushed stone 38 is covered with a new roadbed and paving (hereinafter, simply referred to as "paving") 56. Prior to providing the pavement 56, the plate member 54 is removed.

Next, the other end portion 44 of the invert 22 is formed. The formation of the other end 44 is performed through the same steps as the formation of the one end 42. Therefore, in order to avoid duplication and complication of the description, the detailed description of this step will be omitted and will be briefly described.

First, as shown in FIG. 6, the other half portion of the bottom plate 14 in the width direction, that is, the one side 50 of the road which is the portion from the center line of the road to the other shoulder of the road and the bottom portion of the other side wall. Part of the bottom of 30 is excavated, and further, pit 2
4 to remove the other part of the supporting structure 26 defining 4 to expose the surface and the end face of the other part of the central portion 32 of the invert and not to collapse the other part of the top face of the crushed stone 38 and this. The plate member 40 supported on the substrate is exposed. During this and subsequent formation of the other end 44, the newly formed pavement 56 may be served for general traffic.

Next, as shown in FIG. 7, by pouring hard-mixed concrete on the excavation mark 58 and troweling the concrete, the other end surface of the central portion 32 of the invert and the bottom portion 30 of the other side wall are inscribed. The other end portion 44 of the continuous invert is formed, and then the other plate member 54 is replaced and the crushed stones 38 are piled up.

Finally, as shown in FIG. 8, after backfilling the space above the other part of the central portion 32 and the other end portion 44 of the invert with the backfilling material 52 and pulling out the plate member 54, crushed stones Other parts of the top of 38 and backfill material 5
A new roadbed and a pavement (hereinafter, simply referred to as “pavement”) 60 that covers the 2 are formed. The pavement 60 is connected to the pavement 56 previously formed.

Alternatively to the illustrated example, the one end 42 of the invert may be formed after the other end 44 of the invert is formed.

The central portion 32 of the invert 22 and both end portions 42 and 44 thereof may be made of precast concrete instead of the illustrated example made of cast-in-place concrete. After arranging these in the mine and the excavation mark, the central part and both ends made of precast concrete are filled with mortar in the space between them and the space between the both ends and the bottoms 30 of both side walls of the tunnel, respectively. Filling is performed to integrate the central portion, both end portions, and both side walls. It is also possible to form the center part of the invert 22 and a part of both ends thereof by cast-in-place concrete, and form the other part by precast concrete.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a mountain tunnel and a pit formed in a bottom plate of the mountain tunnel according to the present invention.

FIG. 2 is a cross-sectional view of the mountain tunnel in a state where a pit is formed in the bottom plate.

FIG. 3 is a cross-sectional view of the mountain tunnel in a state where a central portion of the invert is formed in the bottom plate.

FIG. 4 is a cross-sectional view of the mountain tunnel in a state where one side of the road is cut open.

FIG. 5 is a cross-sectional view of the mountain tunnel in a state where one end of the invert is formed.

6] The space above one end of the invert is backfilled,
Further, it is a cross-sectional view of the mountain tunnel in a state where the pavement is formed.

FIG. 7 is a cross-sectional view of the mountain tunnel in a state where the other side of the road is cut open.

[FIG. 8] The space above the other end of the invert is backfilled,
Further, it is a cross-sectional view of the mountain tunnel in a state where the pavement is formed.

[Explanation of symbols]

10 mountain tunnel 12 lining 14 mountain tunnel bottom 18,30 Side wall of lining (mountain tunnel) and its bottom 22 Invert 32, 42, 44 Invert center, one end and other end 36 Drain perforated pipe

Front page continuation (72) Inventor Yoshihiro Yasukawa No. 2 Tsukutocho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (72) Inventor Mitsuo Masuda No. 2 Tsukuto-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (56) Reference JP-A-10-220186 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11 / 00-11 / 40

Claims (2)

(57) [Claims] 1. A method for installing an invert in a bottom plate of an existing mountain tunnel including linings having opposite side walls, wherein the center part in the width direction of the bottom plate extends in the extension direction. To form a central part of the invert in the pit, for one half and the other half in the width direction of the bottom plate, sequentially excavating a part in the extension direction of the bottom plate, the inversion to the excavation trace The method for installing the invert, which comprises performing a step of forming each end of the invert that is continuous with the central portion of the lining and each side wall of the lining and backfilling the excavation mark. 2. The method according to claim 1, further comprising installing a drainage perforated pipe above a central portion of the invert in the mine prior to excavating a part of the bottom plate in the extension direction.