JP2522552B2 - Tunnel lining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tunnel lining method.

<< Conventional Technology >> As is well known, there is a NATM method as a method of lining an excavated tunnel wall with concrete.

The NATM method is a method that uses the strength of the excavated ground as it is, by driving rock bolts into the ground,
It is constructed by spraying concrete on the excavated surface.

However, in such a lining method, a large amount of concrete sprayed on the excavated surface rebounds and scatters as dust, which considerably deteriorates the work environment, and a countermeasure against it has been strongly demanded.

Therefore, for example, in Japanese Unexamined Patent Publication No. 62-17298, a bending plate form frame is stretched on an excavated tunnel inner cross section through arch support, and the tunnel excavation ground and the bending plate form frame are A lining method of placing concrete in the space has been proposed.

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

<< Problems to be Solved by the Invention >> That is, in the lining method disclosed in the above publication, a plurality of metal fittings for nozzle insertion are provided at appropriate places of the bending plate mold, and the metal fittings for concrete placement are provided. Although concrete is injected into the space between the ground and the bending plate formwork by connecting the nozzle, the work of attaching and detaching the metal fitting and the nozzle is complicated, and the metal fitting must be closed after the injection, and this work is also troublesome. Met.

The present invention has been made in view of such conventional problems, and an object thereof is to continuously pour concrete without attaching and detaching the concrete injection pipe. It is to provide a tunnel lining method that can be performed.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention is to install a mold at a predetermined interval along an excavated wall surface, between the wall surface and the mold. In a tunnel lining method of placing concrete in a space, a slot is provided in the formwork that extends along the vertical cross-section of the wall surface and communicates with the space, and a slot facing the slot in the slot along the extension direction of the slot. A fastener part composed of a pair of strip-shaped rubber plates that are arranged and fitted to each other by a fitting means is provided, and the tip of the injection pipe for concrete placement is inserted between the strip-shaped rubber plates to move the injection pipe into a space. Concrete is poured therein, and a pair of strip-shaped rubber plates are fitted and closed at least behind the moving direction of the injection pipe as the injection pipe moves.

<< Effects of the Invention >> According to the tunnel lining method of the above configuration, when pouring concrete, the tip of the injection pipe is inserted into the fastener portion provided in the formwork extending in the vertical cross-sectional direction of the wall surface. Since the injection pipe is moved while moving along the fastener part, if the injection pipe is attached to the mold, concrete can be continuously poured without detaching it.

In particular, for providing a pair of band-shaped rubber plates with fitting means for fitting them together, and for fitting and closing the pair of band-shaped rubber plates at least behind the moving direction of the injection pipe as the injection pipe moves. When moving the injection pipe inserted between the pair of strip-shaped rubber plates, it is possible to prevent the concrete in the form from leaking from between the pair of strip-shaped rubber plates at least at the place where the injection pipe has passed.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

In the tunnel lining method shown in FIG. 1, first, as shown in FIG. 1 (A), the form 12 is installed along the excavated wall surface 10 at a predetermined distance d.

This formwork 12 is formed by hinge-connecting four formwork segments 12a to 12d curved to have a predetermined curvature, is supported by a column (not shown), and is formed in an arch shape. As shown in FIG. 1 (C), a plurality of wheels 14 are pivotally attached to the outer ends of 12a and 12d, respectively, so that the formwork segments 12a to 12d can be bent inward from the hinge portion. When it is removed from the mold, it can be moved along the rail 16 in the tunnel axis direction.

Further, the U-shaped steel material 18 extending along the width direction is fixedly provided on the outer edges of the mold segments 12a, 12d at both ends of the arch-shaped mold 12, and the steel material 18 has Tubes 20 each of which is enlarged as needed so that a part of the outer periphery thereof abuts the wall surface 10 and prevents the poured concrete from leaking are mounted.

Further, on the front surface of each of the formwork segments 12a to 12d, a U-shaped steel material 18 which becomes an arch shape when connected to each other when assembled.
As shown in FIG. 1 (B), a tube 20a that prevents the concrete from leaking is attached to the steel material 18a in which a is fixed and connected in an arch shape, as shown in FIG. 1 (B). .

On the other hand, a fastener portion 24 shown in FIGS. 2 and 3 is provided at the center of the form frame 12 in the width direction.

The fasteners 24 are two formwork segments 12a, b
And a pair of strip-shaped rubber plates 24a, 24a for closing the slit-shaped slot 26 formed so as to be continuous with the central portion of 12c, 12d.

Each of the strip-shaped rubber plates 24a has a substantially L-shaped cross section, and one end thereof is fixed to a step portion 28 formed at the open end of the groove hole 26 on the wall surface 10 side, and protrudes inward to face each other. The protrusion 24b has a projection 24c as a fitting means for fitting with each other.
And a groove 24d are formed along the longitudinal direction.

A guide rail 30 extending along the groove hole 26 is fixed to the inner opening side of the groove hole 26, and a slide plate 32 is movably fitted to the guide rail 30.

At the central position of the slide plate 32, a pair of belt-shaped rubber plates 24a
A mounting fitting 34 is fixedly inserted between the projecting portions 24b of the projecting member 24 so as to project to the outside of the mold 12 and to which the concrete injection pipe is connected on the inner end side.

Further, at both ends in the moving direction of the slide plate 32, the protrusions 24c and the groove 2 of the opposing protrusions 24b and the groove 2 are fitted into the semicircular groove portions 24e formed respectively on the outer sides of the protrusions 24b of the belt-shaped rubber plate 24a.
A pair of fastener closing portions 36 for closing the slot 26 by fitting with 4d are provided.

In this embodiment, in consideration of the rigidity of the formwork segments 12a to 12d, the fastener portion 24 is not provided over the entire length and is divided into two as shown in FIG. 1 (A). ,
In addition, it is set within a range of an angle θ with a predetermined distance from both ends, and the slide plates 32 and the like are arranged on each fastener part 24. The position at which the fastener portion 24 is divided does not necessarily have to be set on the center position of the tunnel cross section shown in FIG. 1 (A), and may be a position displaced to the left and right from the center.

Now, when the formwork 12 having the above configuration is installed, the concrete injection pipe is connected to the mounting bracket 34 of each slide plate 32,
Concrete is poured into the space d between the excavation wall surface 10 and the outer surface of the formwork 12 while moving the slide plate 32 toward the center of the tunnel cross section.

At this time, the concrete to be poured is mixed with a quick-setting agent to solidify it at an early stage, and compressed air is sent into each of the tubes 20 and a to prevent the poured concrete from leaking.

Then, concrete is placed while moving the pair of slide plates 32 along the guide rails 30 from both ends of the formwork 12 toward the center side, and when the movement within the range of the angle θ is completed, the concrete is placed. When the construction is completed and the cast concrete is hardened, the mold 12 is demolded and the next lining is performed.

Now, according to the tunnel lining method of the above-mentioned configuration, when pouring concrete, the tip of the injection pipe is inserted into the fastener portion 24 provided in the formwork 12 extending in the vertical cross-sectional direction of the wall surface, and the injection pipe is injected. Since it is carried out while moving along the fastener part 24, if the injection pipe is attached to the form 12, the concrete can be continuously poured without detaching it, and the construction efficiency is greatly improved.

In particular, in the present embodiment, the belt-shaped rubber plates 24a, 24a are provided with the projection 24c and the groove 24d as a fitting means for fitting these members to each other, and the belt-shaped rubber plates 24a and 24a are moved by the fastener closing portion 36 as the slide plate 32 moves. When moving the mounting bracket 34 of the slide plate 32 to close the rubber plates 24a, 24a, prevent concrete in the form 12 from leaking out between the strip-shaped rubber plates 24a, 24a at a position where the mounting bracket 34 passes. You can

[Brief description of drawings]

FIG. 1 is an explanatory view of a mold used in the tunnel lining method according to the present invention, FIG. 2 is a plan view of an essential part of the mold, and FIG. 3 is a sectional view of an essential part of the mold. 10 …… Wall surface 12 …… Formwork 24 …… Fastener part 34 …… Mounting bracket

Claims (1)

(57) [Claims] 1. A tunnel lining method in which formwork is installed at a predetermined interval along an excavated wall surface and concrete is placed in a space between the wall surface and the formwork, wherein the formwork is used. A groove hole extending along the vertical cross-sectional direction of the wall surface and communicating with the space, and a pair of groove holes arranged in the groove hole facing each other along the extending direction and fitted to each other by fitting means. And a fastener part made of a strip-shaped rubber plate, the tip of an injection pipe for placing concrete is inserted between the strip-shaped rubber plates, while placing the concrete in the space while moving the injection pipe, A tunnel lining method, characterized in that the pair of strip-shaped rubber plates are fitted and closed at least behind the moving direction of the injection pipe as the injection pipe moves.