JPS6354878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water stop method for a tunnel to prevent water from springing inside the tunnel.More specifically, the present invention relates to a water stop method for a tunnel that prevents water from springing inside the tunnel. The present invention relates to a water-stopping method for watertightly connecting a plurality of waterproof sheets disposed between a primary concrete lining and a secondary concrete lining in order to prevent water leakage.

Conventionally, in the tunnel lining section, as shown in Figure 1, a primary lining concrete b is cast on the ground a side, and a waterproof sheet c is attached to the primary lining concrete b using bolts, concrete nails, etc. This is done by nailing and fixing, and then pouring a secondary lining concrete d onto this waterproof sheet c. By interposing the waterproof sheet c between the primary and secondary lining concrete b and d, the primary lining concrete d is Spring water from the lining concrete b side is prevented from seeping into the secondary lining concrete d side.

In this construction, it is necessary to sequentially fix and connect a large number of waterproof sheets to the inner peripheral wall of the primary lining concrete along the length of the tunnel.
In this case, the waterproof sheet must be fixed and connected in a watertight manner; if these are not done watertightly, spring water from the primary concrete lining will leak into the secondary concrete lining.

Conventionally, as shown in Fig. 2, a waterproof sheet generally has a rectangular sheet base c' made of synthetic resin with a passageway e along its length on one side, and a passageway e on the other side of the base c'. Using one edge of a narrow synthetic resin sheet f attached along the length direction, this is nailed to the primary lining concrete b with nails g as shown in Figure 3, and then nailed to the primary lining concrete b. In order to prevent water leakage at the fastening part, the other edge of the narrow sheet f is heated and welded to a waterproof sheet to form a waterproof pocket h covering the nailing part and fixed. The waterproof sheets c fixed to the primary lining concrete b in this manner are connected to each other by heating and welding the edges of the respective waterproof sheets c to be connected using a burner. It is. However, since the connection method for the waterproof sheet c is carried out using a burner, it requires a certain level of skill and cannot be easily performed by anyone, and the strength, watertightness, etc. of the connected parts are likely to vary, and furthermore, the waterproofing The number of welding points between the sheets c is very large throughout the tunnel, so it is time-consuming.
There is a problem that the workability is poor.

The present invention was made to improve the above-mentioned situation, and consists of disposing a synthetic resin waterproof sheet between the primary lining concrete and secondary lining concrete of the tunnel, and connecting these waterproof sheets to each other. In a water-stopping method for tunnels that prevents spring water from the primary lining concrete from seeping through the secondary lining concrete, one side edge of one interconnected synthetic resin waterproof sheet is connected to another synthetic resin waterproof sheet. The synthetic resin waterproof sheet is superimposed on one side edge, and the overlapped portion of the synthetic resin waterproof sheet is heated and melted with heated air, and both sides of the overlapped portion are pressed with a roll to be crimped. These waterproof sheets can be connected easily and with good watertightness.
The purpose is to provide a method to stop water in tunnels.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7.

Reference numeral 1 in FIG. 4 shows an example of a waterproof sheet used in the practice of the present invention. A plurality of chevron-shaped protrusions 3 spaced apart from each other at approximately equal intervals
A groove-like passageway 4 is formed between these protrusions 3.

In this embodiment, the surface of the waterproof sheet 1 on which the protrusions 3 are formed faces the primary lining concrete 5 side, and the water passage 4 is connected to the primary lining concrete 5 side.
The waterproof sheet 1 is brought into contact with the inner circumferential wall of the primary lining concrete 5 so as to match the circumferential direction of the waterproof sheet 1, and a thermoplastic adhesive such as hot melt adhesive is applied to the position corresponding to the protrusion 3 on the other side where the protrusion 3 is not formed. Fusible material sheets 6 are laminated, and nails 7 are driven from the surface of the sheets 6 through the sheets 6 and the waterproof sheet 1 into the primary lining concrete 5. FIG. 5 shows the nail 7 driven in this manner, with its head 8 embedded in the sheet 6 of thermofusible material.

The thermofusible material sheet 6 is preferably a hot melt adhesive sheet made from ethylene-vinyl acetate copolymer or the like, a raw rubber sheet, a synthetic rubber sheet, or the like. Moreover, as the nail 7, a nail for driving concrete can be suitably used.

Next, the thermofusible material sheet 6 stacked on the other side of the waterproof sheet 1 as described above is heated and melted. Through this heat treatment, the thermofusible material sheet 6
is fluidized and naturally covers the head of the nail 7,
Weld to the tarpaulin sheet 1, and attach the tarpaulin sheet 1 and the nail 7.
integrated with.

Thereafter, by allowing the heated and molten part to cool, the molten part solidifies, and as a result, as shown in FIG. Layer 9 is formed.

The thermofusible material sheet 6 can be heated using a burner or a trowel, but it is preferable to use a heating method using a burner from the viewpoint of workability and the like.

In this way, the waterproof sheet 1 is fixed with the chevron-shaped protrusions 3 facing the matching lining concrete 5 side, and with the length direction of the chevron-shaped protrusions 3 coinciding with the circumferential direction of the tunnel. In this case, spring water from the primary lining concrete 5 side flows down through the water passage 4.

Next, as shown in FIG. 7, another waterproof sheet is attached to one edge 10a in the width direction of the first waterproof sheet 1a fixed to the inner circumferential wall of the primary concrete lining 5 as described above to be connected to the first waterproof sheet. After the edges 10b in the width direction of 1b are overlapped, they are bonded under heat and pressure. FIGS. 7 and 8 show the fixed edge 10
This shows a state in which both the overlapping waterproof sheets a and 10b are connected using a thermocompression bonding device 11, and a heated air injection nozzle 13 is provided protruding from the lower part of the heated air production section 12 of this device 11. and
The tip portion 14 is inserted between the two sheets 1a and 1b at the overlapping portion of the one waterproof sheet 1a and the other waterproof sheet 1b. The manufacturing department 12
A roll drive section 16 is connected to the arm 15, and this drive section 16 drives the first roll 17.
is driven. Reference numeral 18 denotes a U-shaped arm by which the first roll 17 and the second roll 19 are attached to the drive unit 16 facing each other. Then, the overlapping portion of both sheets 1a and 1b is formed by both rolls 17 and 1.
It is inserted between 9. Note that 20 is a support that is attached to the inner circumferential wall of the primary concrete lining 5 of the tunnel along its circumferential direction, and the device 11 is designed to run on its own along this support 20. When the device 11 moves on its own along the support 20 in this state,
Along with this, heated air is injected from the tip 14 of the nozzle 13 into the overlapped portion of the sheets 1a, 1b, thereby heating and melting the space between the sheets 1a, 1b in the overlapped portion. It is pressed by rolls 17 and 19, and the overlapping portions are successively crimped. The heating temperature is preferably about 80 to 120 degrees, for example, when the material of the waterproof sheet is polyethylene-vinyl acetate copolymer.

After the other tarpaulin sheet 1b is connected to the one tarpaulin sheet 1a in this way, the device 11 is removed. Thereafter, the other connected waterproof sheet 1b is fixed to the primary lining concrete 5 using the nails 7 by the method described above, and furthermore, another waterproof sheet 1b is attached to the other edge 10c of the other waterproof sheet 1b. One edge of the tarpaulin (not shown) is connected by the method described above. Thereafter, a large number of waterproof sheets are sequentially connected and fixed in the same manner.

According to this embodiment, when connecting a large number of waterproof sheets to each other at both edges, the edges of each sheet to be connected are overlapped with each other, and heated air is introduced between both waterproof sheets in this overlapped portion. Since the overlapping portion is pressed by a roller at the same time as spraying, a large number of waterproof sheets can be easily and quickly connected. Since heating is carried out by jetting heated air, there is no risk of accidents such as melting of the waterproof sheet due to excessive heating, compared to a method of welding by intense heating with a burner or the like. In addition, the hot press bonding device automatically connects the waterproof sheets together while running along the supports erected along the inner circumferential wall of the primary lining concrete, so it has good workability. Furthermore, when fixing the waterproof sheet to the inner peripheral wall of the primary lining concrete, the thermofusible material sheet is stacked on the waterproof sheet and nailed to the primary lining concrete, and then the thermofusible material sheet is heated. Since the part where the nails are driven is sealed, the waterproof sheet can be extremely easily fixed to the inner peripheral wall of the primary lining concrete, and the watertightness of the part where the nails are driven is also good.

In this example, the waterproof sheets were crimped using a heat crimping device; however, the crimping was not limited to this, and the crimping direction was also along the circumferential direction of the tunnel, but the crimping could be done in any direction. You may do so. Furthermore, in this example, the overlapping portion was crimped once using a roll, but the roll was moved back and forth multiple times at predetermined intervals, thereby forming a plurality of crimped portions at the overlapping portion. However, various modifications may be made without departing from the gist of the present invention.

Accordingly, in the present invention, when interconnecting a plurality of waterproof sheets to be fixed to the inner circumferential wall of the primary concrete lining of a tunnel, the edges of the waterproof sheets are overlapped, and the overlapped portions are heated and rolled. Since the waterproof sheets are crimped together, the waterproof sheets can be connected to each other reliably and easily. Since the heating is performed using heated air, the heating temperature can be easily controlled, and there are no problems such as deterioration of the resin or melting of the overlapped parts. Further, since heated air is used to heat the overlapping portion, the apparatus is simplified and has the advantage of high workability.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of a tunnel lining section where a waterproof sheet is installed, Figure 2 is a partially omitted perspective view showing an example of a conventionally used waterproof sheet, and Figure 3 is a primary covering of the same sheet. FIG. 4 is a partially omitted perspective view showing an example of a waterproof sheet used in an embodiment of the present invention, and FIG. 5 is a partially omitted cross-sectional view showing the waterproof sheet installed in concrete. A partially omitted enlarged cross-sectional view showing the sheet attached to the primary lining concrete inner peripheral wall with nails; FIG. 6 is a partially omitted enlarged cross-sectional view showing the sheet fixed;
FIG. 7 is an explanatory plan view showing one embodiment of the present invention, and FIG. 8 is an explanatory cross-sectional side view taken along the - line of the same example. 1... Tarpaulin sheet, 1a... No. 1 tarpaulin sheet,
1b... Other waterproof sheet, 5... Primary lining concrete, 10a, b... One edge, 10c... Other edge, 11... Heat pressure bonding device, 17... First roll, 19... Third 2 rolls.

Claims (1)

[Claims] 1 Multiple waterproof sheets made of synthetic resin are placed between the primary concrete lining and secondary concrete lining of the tunnel, and these waterproof sheets are connected to each other to prevent water from springing from the primary concrete lining. Next, in a method of shutting off water in tunnels to prevent seepage through the lining concrete, one side edge of one mutually connected synthetic resin waterproof sheet is connected to one side edge of another synthetic resin waterproof sheet. Overlap The overlapped parts of both synthetic resin waterproof sheets are heated and melted with heated air, and both sides of the overlapped parts are pressed with a roll to be crimped to connect these waterproof sheets, and these steps are sequentially repeated. A water-stopping method for tunnels that is characterized by connecting multiple synthetic resin waterproof sheets in a completely watertight manner.