JPH01131798A - Tunnel timbering - Google Patents

Abstract

PURPOSE: To attain stability of tunnel timbering by arranging a thin linear material network low between shaft reinforcements in parallel of thick linear material which is lightweighted high strength fiber impregnated with highly anticorrosive resin material and bundled to form a wavy net plate, and burying it in lining. CONSTITUTION: By using fiber bundles which is lightweighted high strength fiber impregnated with highly anticorrosive resin material, a net-like body 1 and a linear material 2 are formed by molding and hardening. A wavy net plate B is formed out of raised streaks 3 having shaft reinforcements 4 on the ridge, and net-like bodies 1 between the streaks 3 into a wavy section. The plate B is provided along the inner face of a pit, then concrete or the like is placed thereon, the plate B is buried in concrete, and the tunnel timbering is formed. Consequently, the timbering has no possibility to be degraded by corrosion, and stability of the timebering can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of shoring in a tunnel.

(Conventional technology) Traditionally, steel arch supports, rock bolts, and sprayed concrete have been used as supports constructed by tunnel excavators. Because it has the advantages of high pressure resistance and good ability to prevent skin from falling off, it is often used as a support for boat fishing.

(Problem to be solved by the invention) However, steel arch shoring is constructed by transporting shaft arches manufactured outside the tunnel into the tunnel according to the basic design cross-section of the tunnel, and installing the shaft arches between each steel arch. Since the construction of sheet pile facilities would also be required, the construction would be large-scale, and the steel arches would not fit in well with the highly uneven surface of the mine, and some areas would be susceptible to the turgor pressure of other mountains, among other drawbacks. have.

The present invention was made in order to improve the shortcomings of conventional tunnel supports, and allows them to fit well into the tunnel surface (and also to prevent skin from falling off) without using heavy waste arches or sheet piles. The aim is to provide a tunnel support that is excellent in preventing this and dealing with ground bulge pressure.

(Means for Solving the Problems) Next, the structure of the present invention will be explained with reference to drawings corresponding to examples.The lightweight and high strength fibers of the present invention are made of a highly corrosion-resistant resin material. The shaft reinforcements 4.4 made of the thick wire materials are arranged in parallel at required intervals, and between the shaft reinforcements 4.4, the mesh body 1 made of the thin wire materials 2 is placed from the shaft reinforcements 4. A wavy mesh plate B positioned low and integrated with the shaft reinforcement 4 is attached to the excavated surface A of the tunnel, and this wavy mesh plate B is buried in concrete C.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the shoring of the present invention is generally constructed by attaching a corrugated net plate B along the inner surface of a tunnel excavation shaft A formed in the ground, and placing concrete on top of the corrugated mesh plate B. A concrete type C such as or mortar is sprayed, and a corrugated net plate B is buried therein to form a continuous body of arch concrete and lining concrete on the inside of the mine.

As shown in FIG. 3, the wavy mesh plate B attached to the inner surface of the pit A is composed of a mesh plate 1 formed integrally with thin wire members 2, 2 intersecting each other, and a mesh plate 1 formed integrally with the thin wire members 2, 2. Raised strips 3.3 are formed parallel to each other at required intervals, and at the top of each of these ridges 4, 4 made of thick wire material are provided, and thin wires forming the net-like plate (■) are provided. It is formed by intersecting and integrating with the shape member 2.2. Therefore, the wavy mesh plate B has the axial reinforcement 4 on the top edge,
The ridges 3.3 with 4 and the mesh plates I between them form a plate with a wave-like cross section.

The linear materials forming the mesh plate 1 and the shaft reinforcement 2 are formed by molding and curing a fiber bundle made of lightweight, high-strength fibers impregnated with a highly corrosion-resistant resin material. Glass fibers, carbon fibers, and the like are suitable as the fibers, but other materials such as synthetic resin fibers, ceramic fibers, or a suitable combination of these fibers can also be used.

In addition, as the resin material for binding the fibers, it is preferable to use vinyl ester resin, which has good adhesion to the fibers and has sufficient strength by itself, for example, unsaturated polyester resin, epoxy resin, phenol resin, etc. Examples include resin.

Note that the linear material is not limited to the above-mentioned material formed by impregnating fibers with a resin, but may also be formed only from a synthetic resin material.

The corrugated mesh plate B having the above configuration is manufactured in a factory, transported to the site, and attached to the inner surface of the tunnel excavation shaft A so that its raised stripes 3 run in the circumferential direction of the tunnel excavation shaft A. In this case, since the wavy net plate B uses a fiber bundle made of fibers impregnated with a resin material, it can be easily curved, has good processability such as cutting, and is lightweight. It can be easily carried into the mine and attached to the inside of the mine by hand.

After attaching the corrugated net plate B to the inside of the mine, concrete C such as concrete or mortar is placed (sprayed) on top of the corrugated net plate B, and the corrugated net plate B is buried in the concrete. As a result, on the inside of the mine, there is an arch concrete 5.5 along the shape of the ridges 3, 3, and a concrete lining integrated between them. A tunnel support structure in which the REIT 6.6 is continuous will be formed.

Although the shape of the raised strip 3 is triangular in cross section in the above embodiment, it may be square in cross section as shown in FIG. You may.

In addition, in the above embodiment, the corrugated mesh board B is formed to have a wide area, but for the convenience of production and transportation, it is manufactured in a standard length and is pieced together as needed on site. It turns out.

Therefore, in the present invention, as shown in FIG.
It is also possible to form the gap in unit of mesh board B' and to install a large number of unit mesh boards B' continuously on site. This will make it even more suitable for production, transportation, and construction.

(Effects of the Invention) As explained above, the tunnel shoring of the present invention is made by impregnating lightweight, high-strength fibers with a highly corrosion-resistant resin material, and arranging shaft reinforcements made of thick wires at required intervals. between the shaft reinforcements, and between the shaft reinforcements, a wavy net plate made of the above-mentioned thin wire mesh is placed lower than the shaft reinforcements and integrated with the shaft reinforcements, is attached to the excavated surface of the tunnel. Since this corrugated net plate is buried in concrete, the inner surface of the tunnel excavation pit is constructed using an extremely simple process of attaching the corrugated net plate to the tunnel surface and pouring concrete over it. in,
Tunnel support facilities and lining facilities can be constructed without using conventional heavy structural materials such as steel arches and sheet piles.

A strong shaft reinforcement is embedded in the arch concrete part, and the shaft reinforcement is integrally connected to the mesh plate.
By working together with the poured concrete, the arch concrete and lining concrete will provide strong tunnel support. In addition, since the corrugated mesh board is corrosion resistant, even if the concrete cracks or peels, or water penetrates, there is no risk of deterioration of the shoring due to corrosion, and the shoring can be stabilized. It has many excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing one embodiment of the shoring according to the present invention;
The figure is a sectional view of the same side, FIG. 3 is a perspective view showing one embodiment of the wavy mesh board used in the present invention, and FIG. 4 is a longitudinal sectional view showing another embodiment of the raised strip portion of the branch mesh board. FIG. 5 is a perspective view showing another embodiment of the branch screen board. A... Tunnel excavation pit B... Corrugated net plate C...
Concrete 1...Mesh board 2...Thin linear material 3...Elevated strip 4...Axis reinforcement 5...Arch concrete 6...Lining concrete Patent applicant Shimizu Corporation Co., Ltd. No. 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Lightweight and high-strength fibers are impregnated with a highly corrosion-resistant resin material, and the thick wire shafts are arranged in parallel at required intervals, and between the shaft reinforcements, the thin wires are placed in parallel. A tunnel characterized in that a wavy mesh board made of a mesh body positioned lower than the shaft reinforcement and integrated with the shaft reinforcement is attached to the excavated surface of the tunnel, and the wavy mesh board is buried in concrete. Shoring.