JPH10238296A - End stopping method for first tunnel lining concrete and its device and for end stop use air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perfectly prevent the execution loss of a first lining concrete, and to improve the strength of a tunnel, and to make it possible to place the first lining concrete into the tunnel. SOLUTION: In a process where a form 16 is provided in a tunnel 12, and a first lining concrete is placed between a tunnel excavated face and the form 16, an for end stop use air bag 22 which is arranged on the peripheral edge of the tip of the form 16, and folded up inside a reinforcing steel plate during nonpressurizing of air, and expands when air is pressurized is expanded. The air bag is therefore pressed toward the tunnel excavated face to prevent the leakage of the first lining concrete placed in the form 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for casting concrete for primary lining between a formwork installed in a tunnel and a tunnel excavation surface, thereby reliably covering the periphery of the formwork on the tunnel excavation side. The present invention relates to a method and apparatus for locking a wife, and an airbag for holding the wife. In addition, in this specification, "casting" means filling mud-like concrete which has not been cured and hardened between the formwork and the tunnel excavation surface.

[0002]

2. Description of the Related Art Originally, concrete for primary lining into a tunnel is directly sprayed on a tunnel excavation surface through a spraying machine, and rock bolts are driven into important points to improve the strength of the tunnel. By pulling the lock bolt toward the tunnel, pressure was applied to the outside of the tunnel (see FIGS. 37 and 38).

In FIGS. 37 and 38, reference numeral 60 denotes a tunnel; 62, a tunnel excavation surface; 64, concrete for primary lining; 66, a concrete spraying machine; 68, a lock bolt;

[0004]

Conventionally, concrete for primary lining in a tunnel has been directly sprayed onto a tunnel excavation surface, so that the concrete to be sprayed is not fixed on the tunnel excavation surface and is thus injected into the tunnel. Easy to bounce off,
The bounce loss is 30 to 40%, and the spray loss of the concrete is large. Therefore, the use amount of the very expensive concrete for the primary lining has increased, and there has been a problem that it is not economical.

[0005] In addition, the rebound during the spraying of the concrete becomes dust, filling the inside of the tunnel, impairing the work environment and causing poor workability.

Another problem is that the driving and pulling work of the lock bolt for improving the strength of the tunnel is troublesome.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention has no construction loss for concrete for primary lining, improves the strength of the tunnel, and can cast concrete for primary lining into a tunnel. It is an object of the present invention to provide a method and an apparatus for damping a concrete for primary lining and an airbag for the damming.

[0008]

According to the method of the present invention, a step of placing a formwork in a tunnel and placing concrete for primary lining between the tunnel excavation surface and the formwork includes the steps of: An airbag for wife stop which is arranged along the tunnel excavation side peripheral edge and is provided inside when the air is not press-fitted, for example, is folded in a reinforcing iron plate having an L-shaped cross section or a concave cross-section, and expands when the air is press-fitted. The primary cover is cast into the formwork by being inflated by air press-fitting and pressed against the tunnel excavation surface along the circumferential direction of the tunnel, and the abutment airbag is brought into contact with the tunnel excavation surface. Characterized by preventing the leakage of concrete for construction, or, if necessary, by attaching an elastic body to the abutment part of the airbag for wife stop on the tunnel excavation surface ,Also The airbag wife stop which is disposed on the periphery of the mold as required, is characterized in that is provided with a plurality divided with respect to the circumferential direction of the mold.

[0009] The apparatus of the present invention is provided on the periphery of a tunnel excavation side of a formwork for placing concrete for primary lining between the excavation surface of the tunnel and the tunnel excavation surface. An airbag for damming, which is folded in a reinforcing iron plate having a mold or a concave cross section and expands at the time of air press-fitting, is arranged over the entire periphery of the mold frame, and the airbag for the damping is inflated by air press-fitting, Characterized in that it is pressed against the tunnel digging surface side along the circumferential direction of the tunnel, and the tying airbag is brought into contact with the tunnel digging surface, or where necessary, An elastic body is fixed to an abutment portion on an excavation surface, or if necessary, a wife-stopping airbag is divided into a plurality in the circumferential direction of the formwork and arranged. Specially It is an.

The airbag for wife stop according to the present invention is characterized in that a reinforcing iron plate having an L-shaped cross section or a concave shape is provided inside the airbag body, and the airbag body is folded inside the reinforcing iron plate when air is not press-fitted. On the thing or, if necessary, the airbag body in contact with the tunnel excavation surface,
An elastic body is fixed thereto.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The device for damping concrete for primary lining of a tunnel according to the present invention, as shown in FIGS. 1 to 4, is used for placing concrete 14 for primary lining in a tunnel 12. FIG. A movable formwork 16 is provided with a wife-stopping airbag 22 shown in FIGS. 5 to 16.

The mold 16 used in the present invention has an upper circular portion 1
8 and the lower circle portion 20 are extendable and foldable and foldable.

As shown in FIGS. 5 to 16, the airbag 22 for stopping the concrete for the primary lining of the tunnel according to the present invention has the following configuration.

The wife-stopping airbag 22 of the present invention has a reinforcing iron plate 26 having an L-shaped cross section inside the airbag body 24, and the airbag body 24 is folded inside the reinforcing iron plate 26 when air is not press-fitted. It is configured.

In this embodiment, the wife-stopping airbag 22 is used.
Uses an airbag body 24 in which a reinforcing cloth layer 30 is adhered to the surface of a rubber layer 28, an air inlet 32 is provided in the center in the length direction, and a mold is provided on both sides in the length direction. 1
A fixing bolt 33 for fixing the airbag 6 is provided, and a folding habit 34 is applied to a key portion of the airbag body 24 by thermal processing.

An elastic body 35 is fixed to the abutment portion of the tunnel excavation surface 36 of the wife-stopping airbag 22, and the elastic body 35 allows the tunnel excavation surface at the contact point with the wife-stopping airbag 22. It is possible to ensure close contact with fine cracks such as cracks in 36.

The contact portion of the tunnel excavation surface 36 of the wife-stopping airbag 22 is a contact portion of the upper surface between the tunnel excavation surface 36 and the wife-stopping airbag 22, and this portion is securely sealed. The concrete 1 for primary lining
4 can be prevented (see FIG. 16).

The material of the elastic body 35 of this embodiment is a sponge.

The airbag body 24 itself consisting of the rubber layer 28 and the reinforcing cloth layer 30 can be sufficiently brought into close contact with a large crack on the tunnel excavation surface 36 at the place where the airbag 22 comes into contact with the wife-stopping airbag 22. .

The size of the wife-stopping airbag 22 is about 24 cm in length (height) and about 45 cm in width in the front view of FIG. 11, and about 24 cm in width in the right side view of FIG.

As shown in FIG. 1 to FIG. 4 and FIG. 16, the tie-stopping airbag 22 is provided on the periphery of the formwork 16 on the tunnel excavation side. , Over the entire length (in the circumferential direction) of the mold 16.

As shown in FIG. 1, the wife-stopping airbag 22 of the present embodiment is provided in a state of being divided into 22 pieces along the circumferential direction of the mold 16.

This is to ensure that the entire surface of the tunnel excavation surface 36 is brought into contact with the irregularities.

The pressing of the damming airbag 22 toward the tunnel excavation surface 36 is due to the inflation of the damming airbag 22 due to the press-fitting of air.

In the drawing, reference numeral 38 denotes a hydraulic cylinder which is a means for expanding and contracting the formwork 16, 44 denotes a gantry, 46 denotes a traveling crawler, 48 denotes a vertically moving jack, 50 denotes a left and right moving jack, 52 denotes a concrete injection nozzle, and 54 denotes a concrete injection nozzle. A concrete spraying machine, 56 is a rock drilling machine, and 58 is a concrete casting site.

Through this device, the periphery of the tunnel excavation side of the formwork 16 is covered (sealed) to prevent leakage of the primary lining concrete 14 to be poured into the formwork 16, and the formwork 16 and the tunnel excavation are prevented. Concrete 1 for primary lining between surface 36
The method of casting 4 is described in detail below.

The tunnel excavation surface 36 of the present embodiment is formed by a rock drill 56 installed in the apparatus or a separate rock drill (not shown).
It is the inner peripheral surface of the surface unevenness excavated in a substantially circular shape.

First, the mold 16 is moved to a predetermined position of the tunnel 12.

At this time, the opposite side of the formwork 16 from the tunnel excavation side needs to be overlapped with the existing concrete placing portion 58.

Next, air is press-fitted into the damming airbag 22 via an air supply mechanism (not shown) to inflate the damming airbag 22 and to extend along the circumferential direction of the tunnel 12. The wife-stopping airbag 22 is pressed toward the tunnel excavation surface 36 side.

At this time, the airbag 22 is pressed against the tunnel digging surface 36 side by a hydraulic cylinder 38, and is applied to the formwork 16 which has been extended to the tunnel digging surface 36 side in advance. Due to the inflation of the airbag 22 due to the press-fitting of the air, the airbag 22 is pressed for each part corresponding to the unevenness of the entire periphery of the tunnel excavation surface 36 (see FIG. 16).

Due to the press-fitting of the air into the damming airbag 22 and the pressing toward the tunnel digging surface 36, the upper surface and the front surface of the damming airbag 22 become the tunnel digging surface 36.
Close to.

At this time, since the elastic body 35 is fixed to the abutment portion of the tunnel excavation surface 36 of the wife-stopping airbag 22, the tunnel excavation surface 36 at the contact point with the wife-stopping airbag 22 is formed. The airbag body 24 is in close contact with a large crack, and the elastic body 35 is in close contact with a small crack such as a crack in a tunnel excavation surface 36 at a contact point with the wife-stopping airbag 22.

According to the above steps, the periphery of the formwork 16 on the tunnel excavation side is surely covered.

Thereafter, concrete 14 for primary lining is poured between the tunnel excavation surface 36 and the formwork 16 and the concrete 14 is cured and hardened.

At this time, the airbag 22 for stopping the wife is securely brought into close contact with each part in accordance with the irregularities of the entire periphery of the tunnel excavation surface 36, so that the very expensive primary lining concrete 14 leaks out. Can be prevented.

The concrete 14 is cast on the form 16
In order from the bottom to the top.

After the concrete 16 has cured and hardened, the air in the airbag 22 is released and the form 16 is shortened from the tunnel excavation surface 36 side through the hydraulic cylinder 38.

At this time, since the damping airbag 22 is provided with the folding habit 34, it is reliably folded into the reinforcing iron plate 26 (see FIGS. 5 to 9).

Therefore, the damming airbag 22 does not hang down outside the reinforcing iron plate 26, and the damming airbag 22 does not come into contact with the outside when the formwork 16 moves and is not damaged.

Through the above steps, the covering of the peripheral edge of the formwork 16 on the tunnel excavation side is released.

FIGS. 17 to 26 show another example of the wife-stopping airbag 22. FIG.

Since the wife-stopping airbag 22 of this embodiment is the same as the previous embodiment except that the elastic body 35 of the previous embodiment is omitted, the description is omitted.

FIGS. 27 to 36 show still another example of the wife-stopping airbag 22. FIG.

This embodiment is the same as the embodiment shown in FIGS. 17 to 26 except that the reinforcing iron plate 26 of the wife-stopping airbag 22 has a concave cross section, and a description thereof will be omitted.

Although the first example does not disclose the work of driving and pulling a lock bolt for improving the strength of the tunnel 12, it is obvious that this work is necessary when the strength of the tunnel 12 is weak. That is.

In the first example, the elastic body 35 is fixed to the main part of the airbag 22 for stopping the wife, but if there is no fine crack on the tunnel excavation surface 36, the structure shown in FIG.
26 to 26 and FIGS. 27 to 36, the elastic body 35 may be omitted.

Although the mold 16 is freely expandable and contractible, it is not necessarily limited to the formable and foldable one.

The wife-stopping airbag 22 is formed by
Are divided into a plurality of parts in the circumferential direction, but the number is not limited to 22 pieces.
It is free to use one corresponding to the entire circumference of 6.

The pressing of the damming airbag 22 toward the tunnel excavation surface 36 is caused by the air pressure of the damming airbag 22, and the hydraulic cylinder 38 presses the formwork 16 on the tunnel excavation surface 36 side. The pressing mechanism may be a pressing mechanism using a hydraulic cylinder, an air cylinder, a shaft, a geared motor, or the like that is separate from the telescopic mechanism of the mold 16.

In this embodiment, the concrete casting of a semi-circular tunnel or the like is performed.
For example, it can be used for underwater tunnels, sewers, and the like.

[0052]

According to the method and apparatus for damming concrete for primary lining of a tunnel and the airbag for damming according to the present invention, the airbag for damming is inflated and pressed toward the tunnel excavation surface. As a result, the peripheral edge of the formwork on the tunnel excavation side can be reliably and easily covered, so that leakage of extremely expensive concrete poured into the formwork can be reliably prevented, and the spray loss caused by conventional concrete spraying can be prevented. The concrete for the primary lining can be easily and reliably cast on the excavated surface of the tunnel without harming the work environment due to dust caused by spray loss of the concrete.

When the airbag is not pressed into the air, the airbag for folding is folded into the reinforced iron plate inside when the airbag is not press-fitted. The wife-stopping airbag can be used for a long time without being damaged by contact with the outside.

Further, by fixing an elastic body to a contact portion of the wife stop airbag with the tunnel excavation surface, a large crack in the tunnel excavation surface at the contact point with the wife stop airbag can be removed. Since the elastic body 24 itself is in close contact with the fine cracks such as cracks, the leakage of the concrete for the primary lining can be more reliably prevented.

Further, by dividing and arranging a plurality of airbags for the wife stop in the circumferential direction of the formwork, the individual airbags for the wife stop can be surely arranged on the entire surface of the tunnel excavation surface. It can be brought into contact, and the efficiency of placing concrete for primary lining can be improved.

Further, by making the shape of the reinforcing iron plate provided inside the airbag for wife stop into an L-shaped cross section or a concave cross section, the airbag body can be securely folded (stored) when air is not press-fitted. Damage to the airbag can be avoided more efficiently.

[Brief description of the drawings]

FIG. 1 is a front view showing a use state of a concrete marring device for a primary lining of a tunnel according to the present invention.

FIG. 2 is a front view showing the same unused state.

FIG. 3 is a side view showing the state of use.

FIG. 4 is a side view showing the same unused state.

FIG. 5 is a plan view of the wife-stopping airbag when air is not press-fitted.

FIG. 6 is a front view of the same.

FIG. 7 is a bottom view of the same.

FIG. 8 is a right side view of the same.

FIG. 9 is a rear view of the same.

FIG. 10 is a plan view of the wife-stopping airbag at the time of air press-fitting.

FIG. 11 is a front view of the same.

FIG. 12 is a bottom view of the same.

FIG. 13 is a right side view of the same.

FIG. 14 is a rear view of the same.

FIG. 15 is an enlarged sectional view taken along line AA of FIG. 13;

FIG. 16 is a side view showing the state of use.

FIG. 17 is a plan view of another wife-stopping airbag when air is not press-fitted.

FIG. 18 is a front view of the same.

FIG. 19 is a bottom view of the same.

FIG. 20 is a right side view of the same.

FIG. 21 is a rear view of the same.

FIG. 22 is a plan view at the time of air press-fitting.

FIG. 23 is a front view of the same.

FIG. 24 is a bottom view of the same.

FIG. 25 is a right side view of the same.

FIG. 26 is a rear view of the same.

FIG. 27 is a plan view of another wife-stopping airbag when air is not press-fitted.

FIG. 28 is a front view of the same.

FIG. 29 is a bottom view of the same.

FIG. 30 is a right side view of the same.

FIG. 31 is a rear view of the same.

FIG. 32 is a plan view at the time of press-fitting air.

FIG. 33 is a front view of the same.

FIG. 34 is a bottom view of the same.

FIG. 35 is a right side view of the same.

FIG. 36 is a rear view of the same.

FIG. 37 is a side view showing a conventional technique.

FIG. 38 is a front view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Tunnel 14 Concrete 16 Formwork 22 Airbag for wife stop 24 Airbag main body 26 Reinforcement iron plate 35 Elastic body 36 Tunnel excavation surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsumasa Okamura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Masafumi Naito 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. Inside the corporation

Claims (13)

[Claims] 1. A step of placing a formwork (16) in a tunnel (12) and placing concrete (14) for primary lining between a tunnel excavation surface (36) and the formwork (16). The airbag (22) is disposed along the periphery of the formwork (16) on the tunnel excavation side and is folded in the reinforcing iron plate (26) provided when air is not press-fitted and expanded when air is press-fitted. )
Is expanded by air injection, and is pressed against the tunnel excavation surface (36) along the circumferential direction of the tunnel (12),
The abutment airbag (22) abuts the tunnel excavation surface (36) to prevent leakage of the primary lining concrete (14) cast into the formwork (16). To stop the concrete for the primary lining of the tunnel. 2. The primary cover of a tunnel according to claim 1, wherein an elastic body (35) is fixed to a contact portion of the wife-stopping airbag (22) with the tunnel excavation surface (36). How to stop wives on concrete for construction. 3. The airbag (22) for stopping the wife formed on the periphery of the mold (16) is divided into a plurality of pieces in the circumferential direction of the mold (16). The method according to claim 1 or 2, wherein the concrete for the primary lining of the tunnel is tied. 4. The tunnel primary according to claim 1, wherein the reinforcing iron plate (26) provided in the wife-stopping airbag (22) has an L-shaped cross section. How to stop the concrete on the lining. 5. The primary cover of a tunnel according to claim 1, wherein a shape of the reinforcing iron plate (26) provided in the wife-stopping airbag (22) is concave in cross section. How to stop wives on concrete for construction. 6. A reinforcement provided inside a tunnel excavation-side periphery of a formwork (16) for placing concrete (14) for primary lining between the excavation surface (36) and the tunnel excavation surface when air is not press-fitted. Iron plate
An air bag (22) for wife stop which is folded in (26) and expands when pressurized with air is arranged around the entire periphery of the formwork (16), and the air bag (22) for wife stop is pressed by air. Along with inflation, the airbag (22) for stopping the wife is pressed against the tunnel digging surface (36) along the circumferential direction of the tunnel (12), and is brought into contact with the tunnel digging surface (36). Device for concrete lining for the primary lining of tunnels. 7. The primary covering of a tunnel according to claim 6, wherein an elastic body (35) is fixed to a contact portion of the wife-stopping airbag (22) with the tunnel excavation surface (36). How to stop wives on concrete for construction. 8. An airbag (22) for stopping the wife, which is arranged on the periphery of the mold (16), is divided into a plurality in the circumferential direction of the mold (16). The concrete damming device for a primary lining of a tunnel according to claim 6 or 7, wherein 9. The tunnel primary according to claim 6, wherein the reinforcing iron plate (26) provided inside the wife-stopping airbag (22) has an L-shaped cross section. Wife stopper for concrete for lining. 10. The primary cover of a tunnel according to claim 6, wherein the reinforcing iron plate (26) provided in the wife-stopping airbag (22) has a concave cross section. Wife stopper for concrete for construction. 11. A reinforcing iron plate (26) having an L-shaped cross section inside a body of an airbag (24), and reinforcing iron plate when air is not press-fitted.
An airbag for stopping a concrete for a primary lining of a tunnel, wherein an airbag body (24) is folded in the (26). 12. The tunnel primary lining according to claim 11, wherein an elastic body (35) is fixed to a contact portion of the airbag body (24) with the tunnel excavation surface (36). Concrete airbag for wife stop. 13. The airbag according to claim 11, wherein the reinforcing iron plate has a concave cross section.