JPH0639880B2 - Tunnel water stop method and water stop plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a water-stopping method for a tunnel, which is a so-called NATM method for performing primary lining with shotcrete in a mountain tunnel or the like, and a stop used therefor. Regarding the water plate.

[Conventional technology]

In the NATM tunnel, a waterproof sheet is often interposed between the sprayed concrete as the primary lining and the secondary lining concrete for the purpose of isolation (edge cutting) and waterproofing. The waterproof sheet is made by stacking EVA (ethylene vinyl acetate copolymer) as a main material and polypropylene woven cloth or nonwoven cloth as a cushioning material.

In addition, since this waterproof sheet is continuously connected by heat welding to each other, it is considered as one continuous sheet, and it is considered that it does not leak water. Therefore, special waterproofing treatment is also applied to the splice joint section of the secondary lining concrete. The current situation is that it has not been done.

[Problems to be Solved by the Invention]

However, if a secondary lining concrete is placed after mounting a continuous waterproof sheet by heat welding as described above, this waterproof sheet is thin (EVA 0.4 mm + cushioning material 3 mm),
The unevenness of the surface of the sprayed concrete as the primary lining or the projection of the head of the rock bolt hits it, or the impact of compaction work during concrete placement is applied,
When the wife formwork is set, it is often damaged due to the addition of push-ups by the wife formwork.

When such damage occurs in the waterproof sheet, the spring water or drip water after the primary lining concrete hardens cannot be completely discharged to the lower end of the side wall through the cushioning material of the waterproof sheet.
Water leaks from the splice joint of the next lining concrete.

Then, it is necessary to construct a water-conducting groove for such leakage treatment.

An object of the present invention is to provide a simple tunnel water-stopping method and a water-stopping plate that can be easily installed by eliminating the disadvantages of the conventional example and eliminating water leakage from the splicing joint portion of the secondary lining concrete. Especially.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a method for constructing a tunnel in which primary lining is performed with sprayed concrete, the sprayed concrete surface is covered with a waterproof sheet, and then secondary lining concrete is placed with a formwork, It consists of butyl rubber plate, and the adhesive side to the waterproof sheet is a single protective sheet,
A mold for the inner surface of the tunnel for placing the secondary lining concrete by using a water stop plate with the secondary lining concrete side covered with two protective sheets at the jointing point of the secondary lining concrete. After setting the frame plate, peel off the protective sheet on the splicing point of the secondary lining concrete on the surface of the waterproof sheet and attach the water blocking plate, and peel off the protective sheet on one side of the other surface to remove this water blocking. The gable form is set so that the ends contact the plate, the secondary lining concrete is placed, and after the concrete has hardened, the form plate is removed from the mold and the remaining protective sheet of the water stop plate is peeled off. The idea is to place the secondary secondary lining concrete.

[Action]

According to the present invention as set forth in claim 1, since the waterproofing sheet is embedded in the splicing point of the secondary lining concrete on the surface of the blasting concrete of the primary lining with the blasting concrete, the waterproof sheet Even if damage occurs in the water, the water and dripping water after the primary lining concrete hardens is blocked by this water stop plate,
It does not leak out from the splice joint part of the secondary lining concrete.

According to the present invention as set forth in claim 2, the water blocking plate can be set simply by peeling off the protective film and adhering it onto the surface of the waterproof sheet, without damaging the thin waterproof sheet. Easy to install.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The tunnel constructed by the method of the present invention first is shown in FIGS.
Referring to the drawing, reference numeral 6 in the drawing is shotcrete, which is the primary lining concrete by the NATM method. Although the waterproof sheet 7 is interposed between the sprayed concrete 6 and the secondary lining concrete 9 that is placed by assembling a formwork, the present invention further includes a waterproof sheet 7.
The water stop plate 8 is embedded in the splicing point of the next lining concrete 9.

FIG. 3 shows an example of the water stop plate 8, which is a strip-shaped butyl rubber plate having a width of about 150 mm and a thickness of about 2.5 mm arranged in the circumferential direction of the tunnel.

The butyl rubber plate of the water stop plate 8 has an adhesive property due to unvulcanized rubber, and is made by mixing a flexible butyl rubber layer 3 (2.0 mm) with a water swelling substance or foam material, or by soft adhesion with vulcanized rubber. Layer 2 (0.5 mm) laminated type.

Further, the water blocking plate 8 has one side covered with a protective sheet 1 as a protective sheet, the other side with a protective film 4 as a protective sheet from the width direction and one end to the center, and the remaining one side from the center to the protective film 5. Covered with. The protective film 4 and the protective film 5 were wrapped with the protective film 4 facing up.

The protective sheet protects the adhesive surface of the water stop plate 8 until use, and the butyl rubber layer 3 has its own adhesive surface.
The soft adhesive layer 2 covers the adhesive surface with an adhesive or a double-sided adhesive tape.

Next, the method of the present invention using such a water stop plate 8 will be described.

As shown in FIG. 1, 1 by spraying concrete 6
The waterproof sheet 7 is attached to the surface of the secondary lining concrete, and then the secondary lining concrete 9 is cast. This is a formwork plate on the inner surface of the tunnel for casting the secondary lining concrete 9. After setting the center face plate 11, marks are made at intervals of about 1.0 m pitch on the surface of the waterproof sheet 7 at the installation position of the later-described gable form plate 10 to be combined with the end of the center face plate 11.

The part marked with this mark is the mounting part of the water stop plate 8.
Blow away the dust with a waste cloth. If the wiping alone is insufficient under conditions such as underground humidity, dry it with a handler ister.

Next, the protective paper 1 of the water blocking plate 8 is peeled off, and the water blocking plate 8 is attached to the surface of the waterproof sheet 7 so as to be aligned with the mark.

The protective film 4 on the opposite side of the water stop plate 8 installed in this way
Peel off, and bolt the gable form plate 10 to the end of the center face plate 11.
Assemble with 12, but again, the end of the gable form plate 10 is a water stop plate 8
Abut the center of. Reference numeral 13 in the drawing is an L-shaped rope for stopping the gable form.

The secondary lining concrete 9 is placed in the formwork.

After the curing of the concrete 9 is completed, the gable form board 10 is dismantled, the center face plate 11 is also pulled down, and half of the protective film 5 of the water blocking board 8 coming out from the end of the secondary lining concrete 9 is peeled off, as shown in FIG. As shown in, the center plate 11 is moved to the next pouring point and the above-mentioned method is repeated to pour the lining concrete 9b this time on the previously lining concrete 9a of the second lining concrete 9 .

Reference numeral 14 in the figure denotes an overlapping metal fitting set at the end of the center face plate 11.

As a result of the above, the previously cast lining concrete 9a and the present lining concrete 9b of the secondary lining concrete 9
The water stop plate 8 is embedded on the surface of the waterproof sheet 7 at the splicing joint portion of the.

Therefore, even if the waterproof sheet 7 is damaged during construction or the like, the water blocking plate 8 prevents the waterproof sheet 7 from passing through the waterproof sheet 7 with spring water or drip water from the wiping concrete 6, and the secondary lining concrete 9 It does not leak inside the tunnel from the splice joint part.

When the soft adhesive layer 2 is mixed with a water-swelling substance, the water-stopping plate 8 swells by taking in water, and the swelling pressure provides a more effective water-stopping action.

〔The invention's effect〕

As described above, the tunnel water stop method and the water stop plate of the present invention are first covered with wiping concrete, and the wiped concrete surface is covered with a waterproof sheet and then covered with a formwork. In the method of constructing a tunnel for laying work concrete, it is possible to eliminate water leakage from the jointing section of the secondary lining concrete by simply adding a simple process.

Also, in the NATM tunnel, the secondary lining winding thickness is as thin as 30 cm, and it is difficult to install with the conventional water stop plate, but the water stop plate of the present invention is thin and light, and the protective sheet is peeled off to provide a waterproof sheet. It can be easily set just by sticking it on and setting up the wife formwork is not troublesome.

[Brief description of drawings]

1 and 2 are longitudinal side views of respective steps showing one embodiment of the tunnel water stopping method of the present invention, FIG. 3 is a longitudinal side view showing an example of the water stopping plate, and FIG. 4 is the present invention. FIG. 5 is a vertical sectional front view of a tunnel constructed by the construction method, and FIG. 1 ... Protective paper, 2 ... Soft adhesive layer 3 ... Butyl rubber layer, 4,5 ... Protective film 6 ... Sprayed concrete 7 ... Waterproof sheet, 8 ... Water stop plate 9 ... Secondary lining concrete 9a …… Concrete lining concrete 9b …… This time lining concrete 10 …… Cable form plate, 11 …… Centre face plate 12 …… Bolt, 13 …… Cable form stop L-shaped steel 14 …… Overlap Metal fittings

Claims (2)

[Claims] 1. A method for constructing a tunnel in which a primary lining is performed with sprayed concrete, the surface of the sprayed concrete is covered with a waterproof sheet, and then the secondary lining concrete is placed with a formwork. After setting the form plate on the inside surface of the tunnel for casting, a water stop plate is attached to the splicing point of the secondary lining concrete on the surface of the waterproof sheet covering the sprayed concrete surface. The gable form is set so that the ends contact with each other, and the secondary lining concrete is placed. After the concrete has hardened, the form plate is removed from the mold, and the second-order lining concrete is placed. A tunnel water stoppage construction method characterized by 2. A butyl rubber plate, one side of which is a protective sheet on the side of adhesion to the waterproof sheet, and the other side of which is a side of the secondary lining concrete, which is a protective sheet. A water stop plate for the tunnel, which is characterized by being covered.