JPH0384198A - Tunnel lining work - Google Patents

Abstract

PURPOSE:To continuously place concrete without the need to attach and detach an injection tube by a method in which a concrete injection tube is connected to the fitting metal of the formwork fastener, while moving a slide plate concrete is placed, and after the placement is ended the next covering of soil is made. CONSTITUTION:An arch-shaped formwork 12 is formed along an excavated wall face 10, and wheels are attached to the outer ends of segments 12a and 12b on both ends in such a way as to enable it to move toward the axial direction of tunnel after separation of the formwork. A concrete injection tube is connected to the metal tool 28 of a slide plate 26 attached to the widthwise central slit opening 24 of the formwork 12. While moving the paired plates 26 along a guide rail 30, concrete is placed into the aperture(d) between the wall face 10 and the outer face of the formwork 12. After the placement is ended by movement within an angle, the formwork is separated and the next soil covering is made. Concrete can thus be continuously placed without the need to attach and detach the injection tube, and the efficiency of construction can also be raised.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a tunnel lining method.

(Prior Art) As is well known, the NATM construction method is a method of lining an excavated tunnel wall with concrete.

The NATM construction method utilizes the strength of the excavated earth as it is, and involves driving rock bolts into the earth and spraying concrete onto the excavated surface.

However, with this lining method, a considerable amount of the concrete sprayed onto the excavated surface bounces back and scatters as dust, resulting in a considerable deterioration of the working environment, and there has been a strong demand for countermeasures.

Therefore, for example, in Japanese Patent Application Laid-open No. 17298/1983,
A lining method has been proposed in which bent plate formwork is stretched across the hollow section of the excavated tunnel via arch supports, and concrete is poured into the tunnel excavation ground and the space between the bent plate formwork. There is.

However, the lining construction method disclosed in this publication also had the technical problems described below.

(Problem to be Solved by the Invention) In other words, in the lining construction method shown in the above publication, a plurality of nozzle insertion fittings are provided at appropriate locations on the bent plate formwork, and these fittings are used for concrete pouring. The nozzle is connected and concrete is poured into the space between the ground and the bent plate formwork, but the work of attaching and detaching the metal fittings and nozzle is complicated, and
It was also necessary to close the metal fittings after injection, and this work was also troublesome.

This invention was made in view of these conventional problems, and its purpose is to enable continuous concrete pouring work without the need for attaching and detaching concrete injection pipes. The objective is to provide a tunnel lining method that can be used.

(Means for Solving the Problems) In order to achieve the above object, the present invention installs formwork at predetermined intervals along an excavated wall surface, and provides a space between the wall surface and the formwork. In the tunnel lining method for pouring concrete, the formwork is provided with a slit-shaped opening extending in the vertical cross-sectional direction of the wall surface, and a metal fitting for mounting an injection pipe for concrete pouring is provided in this opening. A slide plate integrally attached thereto is movably installed, and a thin plate is attached to the slide plate that closes the opening as the slide plate moves, and while the slide plate is moved along the opening, the slide plate is moved along the opening. It is characterized by pouring concrete.

(Operations and Effects of the Invention) According to the tunnel lining method with the above configuration, concrete is poured by installing a movable slide plate in a slit-shaped opening extending in the vertical cross-sectional direction of the wall surface formed in the formwork. ,
The injection is performed continuously by connecting an injection pipe to the metal fittings of the slide plate and moving the slide plate along the opening.

At this time, the opening of the formwork is closed by a thin plate as the slide plate moves, thereby preventing leakage of poured concrete.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of the tunnel lining method according to the present invention.

In the tunnel lining construction method shown in the same figure, first, Figure 1 (A)
As shown in FIG. 1, formworks 12 are installed along the excavated wall surface 10 at predetermined intervals d.

This formwork 12 is formed by hinge-connecting four formwork segments 12a to 12d curved to a predetermined curvature, and is supported by pillars (not shown) to form an arch shape, and formwork segments at both ends. At the outer ends of 12a and 12d,
As shown in FIG. 1C, a plurality of wheels 14 are pivotally connected to each other from the hinge portion to each formwork segment 12.
When removed from the mold by bending a to d inward, it is configured to be movable along the rail 16 in the tunnel axis direction.

Further, a U-shaped steel member 18 extending along the width direction is fixed to the outer edge of the formwork segments 12a, 12d at both ends of the arch-shaped formwork 12, and the steel member 18 has the following features: A tube 20 is attached to each tube, which is enlarged as necessary so that a part of its outer periphery abuts against the wall surface 10 to prevent leakage of poured concrete.

Further, on the front side of each formwork segment 12a-d, there is a U-shaped steel member 1 that is continuous and forms an arch when assembled.
8a is fixedly installed and the steel members 18a are connected in an arch shape.
As shown in FIG. 1(B), a tube 20a is attached which is enlarged and comes into contact with the face 22 to prevent leakage of concrete.

On the other hand, at the center in the width direction of the formwork 12, as shown in FIGS. 2 and 3, a slit-shaped opening 24 is provided that extends in the vertical cross-sectional direction of the excavated wall surface 10.

As shown in FIG. 1(A), these slit-shaped openings 24 are formed as a pair within a predetermined angle θ so as to be symmetrical with respect to the central axis of the tunnel, and one One end of the opening 24 is located inside the end of the formwork segment 12a, the other end is located inside the end of the formwork segment 12b, and the other opening 24 is located inside the end of the formwork segment 12C. from the inside of the mold segment 12d to the inside of the end of the formwork segment 12d.

Note that the dividing position of the opening 24 does not necessarily need to be set at the illustrated position, and may be shifted to the left or right.

A slide plate 26 is movably installed in each opening 24.

A hollow cylindrical metal fitting 28 to which an injection pipe for pouring concrete is attached is integrally fixed to the slide plate 26.
The slide plate 26 fits into a guide rail 30 provided at the inner end of the opening 24.

On the other hand, at one end side of each opening 24, a formwork segment 12 is provided.
A winding shaft 34 supported by brackets 32 projecting from a and 12d is provided, and a flexible thin plate 36 made of metal or synthetic resin is wound around this winding shaft 34.

The formwork segment 12 is provided on the opposite surface of the opening 24.
A pair of slit grooves 38 are formed along the opening 24 on the outer surface side of each of a to 12d, and one end of the slit groove 38 is opened between the end of the opening 24 and the winding shaft 34. Then, one end of the thin plate 36 is inserted into the slit groove 38 through this opening, and the end of the thin plate 36 is fixed to the slide plate 26.

Now, when the formwork 12 with the above configuration is installed, each slide plate 26 has formwork segments 12a and 12d of the opening 24.
In this state, the concrete injection pipes are connected to the metal fittings 28, respectively, and the excavated wall surface 10 and the formwork 1 are moved to the center side of the tunnel cross section while each slide plate 26 is moved to the center side of the tunnel cross section.
Concrete is placed within the distance d between the outer surface of

At this time, the concrete to be poured is mixed with an accelerating agent to cause it to harden early, and also to cause each tube 20. Compressed air is sent into the chamber a to prevent the poured concrete from leaking.

Then, concrete is poured while moving the pair of slide plates 26 along the guide rails 30 from both ends of the formwork 12 toward the center, and when the movement within the range of angle θ is completed, the concrete is poured. When the setting is finished and the poured concrete has hardened, the formwork 12 is removed and the next lining is performed.

At this time, as the slide plate 26 moves, the thin plate 36 wound around the winding shaft 34 is unwound, thereby closing each opening 24 and preventing concrete from leaking from the opening 24. Ru.

When the poured concrete hardens, the injection pipe is removed from the metal fitting 28, and the slide plate 26 is moved to the end of the opening 24 while winding the thin plate 36 around the winding shaft 34 to prepare for the next lining. It will be done.

Now, according to the tunnel lining method with the above configuration, concrete is poured by attaching the tip of the injection pipe to the metal fitting 28 fixed to the slide plate 26, and then moving the slide plate 26 to the opening 2.
4, so the injection tube is attached to the metal fitting 28.
Once installed, concrete can be poured continuously without having to be attached or detached, greatly improving construction efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a formwork used in the tunnel lining method according to the present invention, FIG. 2 is a plan view of the main part of the formwork, and FIG. 3 is a sectional view of the main part of the formwork. 10... Wall surface 12... Formwork 2
4...Opening 26...Slide plate 28...Metal fittings 30...Guide rail 36...Thin plate

Claims (1)

[Claims] In a tunnel lining method in which formwork is installed at predetermined intervals along an excavated wall surface and concrete is poured between the wall surface and the formwork, the formwork is placed in the vertical cross-sectional direction of the wall surface. A slit-shaped opening extending from the bottom is provided, and a sliding plate integrally attached with a fitting for mounting an injection pipe for pouring concrete is movably installed in this opening, and the sliding plate is provided with a sliding plate that moves as the sliding plate moves. A tunnel lining method characterized in that a thin plate is attached to close the opening, and the concrete is poured while the slide plate is moved along the opening.