JPS6018800B2 - How to install tunnel water stop sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rock bolt construction method for tunnels, a concrete spraying method, and a method for attaching a water-stop sheet to rock, etc. Also in the temporary wrapping method, the method of attaching a water-stop sheet to pin holes, etc. It is characterized by a construction method that maintains sufficient watertightness without damage, maintains back voids, facilitates the installation of a water collection village, and ensures complete drainage from the back side.

Each sheet is adhesively connected with double-sided tape that has been pre-processed on the side edges.

Now, to explain an example using a diagram, a water-stop sheet made of vinyl acetate or the like is coated with a disc body 3 made of the same material as the water-stop sheet and having a protruding ring portion 2 at an arbitrary location, and then the water-stop sheet is A ring 4 made of spring steel is engaged with the remaining part 2, and a ring 5 that is engaged in a perpendicular direction is fastened to a wire 7 of a steel mesh 6 that holds the concrete inside the tunnel. It is something.

The method of attaching waterstop sheets to H-beams in conventional tunnel construction methods had a stable foothold based on a certain standard, the flange of the H-beams, and the sheet could be firmly attached using stoppers that matched the size of each H-beam. In the temporary wrapping method, the thick sheet is fastened directly to concrete or bedrock using steel pins or concrete pins, so there is a drawback that the sheet may break where the pins are driven and water leaks from that area. Since there are no hair voids, there is a problem in installing water collection materials and it is difficult to drain water from the back side. The present invention solves the above-mentioned drawbacks, and since the sheet is suspended and supported on the wire mesh that serves as the concrete core by the rings 4 and 5 that engage in the cross direction without making any holes, the sheet can be It can also handle misalignment, and since the back gap is formed on the entire surface on the back side of the sheet, it is easy to install water collection material and drainage from the back side is completely easy. death,
A lock bolt 8 is driven into an appropriate location, a steel mesh 6 is attached and stretched, and the water stop sheet of the present invention is attached to the steel mesh wire with a ring. Shotcrete is then placed on the back of the sheet, and then finishing concrete is placed as a lining. When rock bolts are driven into the ground of a base moat, the head of the bolt does not necessarily protrude evenly on extremely uneven surfaces, so instead of using a head that is held in a fixed position, This method utilizes a steel mesh that is stretched over the steel mesh and engages with the steel mesh through two rings. If the position of the plate having the ring portion corresponds to the position of the water collection material, several rings 5 may be connected and hooked to the mesh wire, so that the rings can be shifted and held suspended. That is, in the present invention, a hair gap is formed by the rings 4 and 5 between the water-stop sheet and the steel mesh serving as the core of the concrete, so that the water collection material can be easily installed between this gap and the back surface drainage is completed.

If the wire ends of the mesh are sharp, the sheet will tear under heavy pressure during concrete pouring, so to protect this and also for the purpose of collecting water, the mesh 6 is fixed at the water collection village 9 with thin wire as shown in Figure 2. . Since these water collecting materials are completely covered with sheets, there is no mixing of concrete components during concrete pouring, and there is no possibility of clogging. As described above, the water-stop sheet used in the tunnel temporary wrapping method has the effect of maintaining complete watertightness without any fear of damage, allowing complete construction of water collection equipment, and allowing installation of the water-stop sheet without leakage.

[Brief explanation of drawings]

FIG. 1 is a front view of the hooked state, FIG. 2 is a perspective view of the water collecting material fixed, and FIG. 3 is a perspective view of the water stop sheet. 1...Water stop sheet, 2...Ring, 3÷
...Disc body, 4, 5...Ring, 6...Steel mesh, 7. ．． ...Wire 1, 8...Rock bolt, 9...Water collection material.
'Bag' Figure 2 Figure 3

Claims (1)

[Claims] 1. A water-stop sheet made of vinyl acetate, etc., with a protruding ring part made of the same material as the water-stop sheet is high-frequency welded to any location, and the water-stop sheet is attached to the ring part made of spring steel.
A method for installing a tunnel water stop sheet, which is characterized in that it is installed by engaging and connecting it to a wire of a steel mesh that holds tunnel interior concrete through two rings.