JPH03206297A - Waterproof sheet for tunnel and fixing structure thereof - Google Patents

Abstract

PURPOSE:To prevent breakage of a waterproof sheet due to contact of it with an anchoring tool by anchoring the waterproof sheet, to the back of which a cushioning material is laminated, to a natural ground through a fin for fixing. CONSTITUTION:A back cushioning material 2 formed of non-woven cloth is laminated to a water-barrier sheet body 1, e.g. rubber, and a weld margin 4 is formed to the outside to form a waterproof sheet 10. Fins 6 for fixing in a shape having a containing space for a concrete pin 7 are locked to the end parts on both sides of the cushioning material 2. The cushioning material 2 of the sheet 10 is brought into contact with the wall surface of sprayed concrete 5, and the pin 7 is driven in the concrete 5 through the fin 6 to secure the pin. Similarly, after an adjoining waterproof sheet is fixed, weld margins 4 are welded and joined with each other. Since even when the placing pressure of lining concrete is applied, the pin does not make contact with the sheet body, this constitution prevents breakage of the sheet body and reliably prevents leakage of water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel waterproof sheet that is attached to a concrete wall of a tunnel for waterproofing purposes, and a fixing structure for the waterproof sheet. Spring water from the ground in the tunnel excavation tunnel is collected and drained into a side ditch installed next to the tunnel. At this time, to prevent the spring water from flowing into unexpected places within the tunnel, multiple waterproof sheets are connected and applied to the concrete-sprayed ground walls. Conventionally, when attaching a waterproof sheet to the wall on the ground side, both ends of the back cushioning material, which is integrated with the waterproof sheet, are fixed with rivets from a concrete bin. For example, Japanese Utility Model Publication No. 62-35760 discloses that a water-stop sheet and a back cushioning material are separated near the joints of adjacent waterproof sheets, and only the back cushioning material is fixed to the wall on the ground side by driving rivets. is introduced. However, in conventional waterproof sheet installation construction, there are many mistakes when driving concrete pins.
Also, when the tip of the concrete bin reaches bedrock, the concrete pin cannot be completely driven in. In such cases, the head of the pin often remains stuck out. When construction continues in this state, the pressure of pouring concrete will push the waterproof sheet against the protruding head of the pin. As a result, the tarpaulin is damaged and
This may cause water leakage.

Therefore, it is necessary to drive the missed pin completely to the pin head again using a fastener driving machine.

Needless to say, driving the rivets a second time requires more time and effort, and the second driving operation must be performed carefully.

For example, if the muzzle angle of the fastener driving machine differs from the first time when driving a fastener for the second time, cracks are likely to occur in the concrete sprayed onto the earth, and the bottle itself cannot be fixed. Therefore, re-driving the rivets was a troublesome task that required careful attention.

The present invention relates to a tarpaulin sheet and its fixing structure that overcomes such difficulties, and includes a tarpaulin main body, a back cushioning material integrally processed into the tarpaulin main body, and a back cushioning material integrally processed into the waterproof sheet main body. A waterproof sheet for tunnels is characterized in that it consists of fixing fins provided on both ends of a side surface of the earth, and the back cushioning material is attached to the side surface of the earth, and the fixing fins of the waterproof sheet for tunnels are attached to the side surface of the earth. This is a fixing structure for a tunnel waterproof sheet, which is characterized by being integrally fixed to the mountain side with an anchoring device.

In a fixed structure in which a waterproof sheet for tunnels is attached to a concrete wall of a ground, the head of the anchoring device that fixes the waterproof sheet to the wall on the ground side is connected to the back cushioning material and the fixing fin. It is designed to be located between. That is, the back cushioning material is placed between the head of the anchoring device and the waterproof sheet, so that the two do not come into direct contact.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of the present invention will be described with reference to the drawings.

The waterproof sheet main body 1 used in this example is integrated with a back cushioning material 2, as shown in FIG. This back cushioning material 2 is adhered to the waterproof sheet main body 1 at a plurality of locations. In addition, the outermost adhesive point 3 is the back cushioning material 2.
It is set at the end of the The outer waterproof sheet main body 1 has a sheet welding margin 4. This sheet welding allowance 4 has a length that projects from the end of the back cushioning material 2 in order to facilitate joining with the adjacent waterproof seam O.

For the waterproof sheet main body 1, a waterproof sheet made of soft resin, rubber, or the like is used. On the other hand, the back cushioning material 2 is made of a water-permeable material such as a nonwoven fabric that is highly compatible with the shotcrete 5 on the ground side.

On the shotcrete side 5 surface of the back cushioning material 2, fixing fins 6 are attached to both ends of the back cushioning material 2, and the waterproof sheet main body I, the back cushioning material 2, and the fixing fins 6 form a waterproof sheet. 10 are under guard. The fixing fin 6 has an inner end portion adhered to the back cushioning material 2, and a slight gap is formed between the fixing fin 6 and the back cushioning material 2 on the outer side. This gap serves as a space for accommodating the head of a concrete pin 7, which is a type of anchoring tool.

Next, the installation work of this waterproof seam O will be explained.

First, the back cushioning material 2 is placed on the wall surface of the shotcrete 5 on which the tarpaulin main body 1 of the tarpaulin main body 10 is to be stretched.
and fold both ends. This results in
The space above the fixing fins 6 is opened. Next, the concrete bottle 7 is poured into the shotcrete 5 and fixed via the fixing fins 6. Similarly, adjacent waterproof sheets 10 are fixed to sprayed concrete 10, and the welding margins 4 of each sheet 10 are welded together using a welding machine.

Figure 2 shows an example where the thickness of the tarpaulin main body 1 and the sheet welding margin 4 are different;
Make it the same width as the back cushioning material 2 and glue it at the outermost edge,
A sheet welding margin 4 thicker than the tarpaulin sheet body 1 is adhered to the outer surface of the tarpaulin sheet body 1 located slightly inward from the end of the tarpaulin sheet body 1, with both ends not separated. In this fixing structure, the head of the concrete pin 7 is located between the back cushioning material 2 and the fixing fin 6, and the contact of the concrete pin 7 head with the waterproof sheet 1 is prevented by the back cushioning material 2. blocked. Therefore, when placing pressure of covering concrete is applied, the waterproof sheet body 1
Although it is pressed against the opposite inner surface of the back cushioning material 2,
It does not come into contact with the head of the concrete pin 7. Therefore, the waterproof sheet main body 1 is prevented from being caught on the head of the concrete pin 7 and damaged.

In the embodiment shown in FIGS. 1 and 2, the waterproof sheet main body 1 is uniformly joined to the back cushioning material 2 over the entire surface, but as shown in FIGS. 3 and 4, the waterproof sheet main body 1 The back cushioning material 2 may be locally bonded to the back cushioning material 2 through the adhesive piece 8. Furthermore, as shown in FIG. 2
The sheets may be bonded at a position slightly inward from the extreme end of the sheet, and the sheet welding margin 4, which is thicker than the waterproof sheet body 1, may be bonded to the waterproof sheet body 1 at that portion.

In the above-described embodiment, the concrete pin 7 as the anchoring device is straight, but it may be a U-shaped nail.

Results As explained above, in the present invention, the anchoring tool for fixing the waterproof sheet main body to the concrete wall surface does not penetrate through the back cushioning material, but instead uses the fixing fins attached to the back cushioning material. It penetrates.

Therefore, the head of the anchoring tool does not come into contact with the main body of the tarpaulin, and even if it is fixed with the anchoring tool driven in with the head protruding, the main body of the tarpaulin will not be damaged. It disappears.

Therefore, water leakage is reliably prevented. Further, since there is no need to re-drive the anchor fixture whose head protrudes, the riveting work becomes easier and there is no fear of cracks occurring in the concrete due to re-driving.

[Brief explanation of drawings]

Fig. 1 is a sectional view for explaining one embodiment of the waterproof sheet fixing structure of the present invention, and Figs. 2 to 5 are sectional views of other embodiments illustrating the state of welding with adjacent waterproof sheets. be. ■... Waterproof sheet body, 2... Back cushioning material, 3...
・Welded part, 4... Seat welding allowance, 5... Shotcrete, 6... Fixing fin, 7... Concrete pin, 8... Adhesive piece, 10... Waterproof sheet .

Claims (2)

[Claims] (1) For tunnel use, comprising a waterproof sheet main body, a back cushioning material integrally processed into the waterproof sheet main body, and fixing fins provided at both ends of the back cushioning material on the side of the ground. Tarpaulin. (2) A tunnel characterized in that the back cushioning material according to claim 1 of the patent claim is attached to the side surface of the earth, and the fixing fins of the tunnel waterproof sheet are integrally fixed to the earth side with an anchoring tool. Fixed structure of waterproof sheet.