JPH0312877Y2 - - Google Patents

Description

[Detailed description of the invention] This invention mainly relates to a PC lining board used for interior lining of mountain tunnels.

In recent years, the applicant has developed a method for lining mountain tunnels.
After the load of the ground is supported by shoring, etc., a PC lining board is erected between the supports, and this is used as a formwork to fill the gap between the ground and the PC lining board with a hardening agent such as concrete. A simple tunnel lining method that eliminates the need for formwork and decorative mortar coating is achieved by filling and integrating the soil load with the consolidation agent and PC lining board. It is being developed.

By the way, the PC lining board used in this construction method needs to have sufficient strength to withstand various loads, so it is desirable to use a high-strength PC board such as SFRC, but SFRC does not cause rust on the surface. After lining, decorative mortar must be applied, which is a complicated and uneconomical process.

In view of the above-mentioned problems, this idea consists of a mortar layer on the inner surface of the tunnel and an SFRC layer on the outer surface, and both layers are integrated through a steel mesh plate, and when manufacturing the lining plate, it follows the shape of the PC lining plate. A PC lining board that makes it easy and reliable to install flexible wire mesh, etc., which is difficult to properly install, by holding it in a predetermined shape with steel rods fixed to it. This is what we propose.

The following describes an embodiment of this invention shown in the drawings. The PC lining plate 1 formed into an arc plate with a required curvature is made of wire mesh, expanded metal, etc., in which the required number of steel rods 2 are fixed at predetermined intervals by welding or the like. A mortar layer 4 and a fiber concrete layer 5 are integrated through a steel mesh plate 3, with the mortar layer 4 on the front side that corresponds to the inner surface of the tunnel, and the fiber concrete layer 5 on the back side that corresponds to the outer surface of the tunnel. It is located in

As fiber concrete layer 5, SFRC
Or, using GFRC etc., together with the mortar layer 4 integrated with the steel mesh plate 3 as ferrocement.
The entire PC lining board maintains extremely high strength, especially when SFRC is used, even if rust occurs due to the steel fibers, the surface mortar layer 4
This prevents rust from being exposed on the inner surface of the tunnel, allowing it to maintain a good finished appearance for many years.
Furthermore, when GFRC is used, its deterioration over time can be suppressed by the steel mesh plate 3 and the ferrocement of the mortar layer 4.

When manufacturing this PC lining plate, the steel rod 2 which has been bent in advance to the required curvature is welded to the steel mesh plate 3, or the steel rod 2 is welded to the flat steel mesh plate 3.
By welding and then bending the entire
The steel mesh plate 3 is formed into a shape that follows the curvature of the PC lining plate, and is pressed onto the mortar layer 4 filled to a uniform thickness in the formwork, and a fiber concrete layer 5 is filled on top of it. Both layers are consolidated and integrated.

As described above, according to this invention, the back side of the PC lining plate facing the tunnel's ground is composed of a high-strength fiber concrete layer, and the front side exposed to the inner surface of the tunnel is composed of a mortar layer. In addition, in the case of GFRC, the steel fibers in the fiber concrete layer prevent rust from being exposed on the surface, and the finished appearance after tunnel lining can be maintained for many years. Elocement suppresses aging of the fiber concrete layer and maintains the strength of the PC lining board.

Since the PC lining board is a composite board of the mortar layer and the mortar layer firmly integrated through the steel mesh board, it has extremely high strength and maintains sufficient yield strength to support the load of the earth. can be done.

In addition, since the steel mesh plate is made by fixing steel rods,
It is possible to reliably hold wire mesh, etc., which are prone to bending and deformation and difficult to maintain a certain shape, in a predetermined shape, and it is easy to manufacture PC lining plates when steel mesh plates are placed in a formwork and formed. At the same time, quality can be made uniform.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention, and FIG. 2 is a plan view of a wire mesh used in this invention. 1...PC lining board, 2...steel rod, 3...steel net plate, 4...mortar layer, 5...fiber concrete layer.

Claims (1)

[Scope of utility model registration request] A mortar layer is placed on the front side that is exposed to the inner surface of the tunnel, and a fiber concrete layer is placed on the back side that faces the tunnel ground side, through an arc plate-shaped steel mesh plate to which steel rods are fixed in the arc direction. A PC lining board for tunnel interior, characterized by being made by integrating both of the above layers.