JPS62128748A - Waterproof sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to, for example, a tunnel installed between the ground of a tunnel or between a primary lining concrete and a secondary lining concrete so that spring water from the primary lining concrete side is Regarding the waterproof sheet used to prevent water from leaking into the secondary lining concrete side, to be more specific, it has a vibration resistance of 11. 1P110 according to IEtl121, it is difficult to cause damage, and it also effectively prevents the transmission of vibration to the secondary lining concrete, etc. that exists inside it. ? Regarding waterproof sheets.

ffl Good 1 Conventionally, as seen in the NATM construction method, a waterproof sheet is installed between the tunnel's ground or the overlay concrete and the secondary lining concrete 1, and the Waterproofing sheets used for this purpose include synthetic resin sheets and non-woven fabrics. Chinokumi Kosho 51-3
No. 7844) and the like have been proposed.

Problems with 1v trying to ro However, in tunnel waterproofing work, after excavating a tunnel, the rocks and gravel above it may be collected, and in this case, the rocks are destroyed by blasting with dynamite and the rocks are removed. Conventional waterproof sheets, such as synthetic resin sheets laminated with non-woven fabric, have a waterproofing effect, but they do not have the ability to absorb vibrations caused by blasting, etc. Therefore, when blasting is applied, especially if the tunnel is close to the rock extraction site, the vibrations caused by the blasting may damage the waterproof sheet, impairing its water-stopping performance and causing water leaks, or the vibrations may damage the waterproof sheet. There was a risk that this would be transmitted directly to the secondary lining concrete, causing the secondary lining concrete to fall off.

The present invention was developed in view of the above circumstances, and has excellent vibration resistance, effectively absorbs photographing caused by blasting, etc., and is waterproof, so it is suitable for use with tunnel foundations and primary cladding concrete. A waterproof sheet that is suitably used as a civil engineering sheet for the purpose of preventing spring water from the ground side from leaking into the secondary lining concrete by installing it between the secondary lining concrete. The purpose is to provide.

In order to achieve the above-mentioned object, the present invention is a method for achieving the above-mentioned object by combining a water-impermeable plastic sheet, a vibration-absorbing rubber sheet, and a sheet-like vibration-absorbing member consisting of a large number of independent air chambers. niv
The waterproof sheet main body is made up of four layers.

In this case, there is no particular restriction on the order in which the water-impermeable sheet, rubber sheet, and vibration-absorbing member are laminated (and if necessary, a plurality of each of the water-impermeable sheet, rubber sheet, and vibration-absorbing member may be used. Although they may be laminated in an appropriate order, from the viewpoint of absorbing vibrations, it is preferable to have 8i layers of vibration absorbing members on the rubber sheet surface.

Further, when the waterproof sheet of the present invention is used for a tunnel, it is preferable to laminate a water permeable sheet on one side of the waterproof sheet main body made of the water impermeable sheet, rubber sheet, and vibration absorbing member.

1-"L According to the present invention, a rubber sheet capable of absorbing vibrations and a sheet-like motion absorbing member consisting of a large number of independent air chambers are laminated on a water-impermeable sheet, so it has excellent vibration resistance. When the waterproof sheet of the present invention is installed between ground or secondary lining concrete and secondary lining concrete for use in tunnels, it reliably absorbs vibrations caused by blasting, etc., and prevents damage to itself as much as possible. In addition to effectively exerting its function as a waterproof sheet, it also prevents vibrations caused by blasting etc. from being transmitted to the secondary lining concrete, thus effectively preventing the secondary lining concrete from falling off. can be prevented.

Here, the rubber sheet capable of absorbing imaging has a function of particularly absorbing internal Erne V-, and the sheet-like vibration absorbing member consisting of a large number of independent air chambers particularly absorbs vibrations with a relatively good wavelength. , shake inside? Therefore, as mentioned above, the waterproof sheet of the present invention satisfactorily absorbs long- and short-wavelength (long and short wavelengths) and protects the building inside from vibrations.

Embodiments of the present invention will be described below with reference to the drawings.

11 Figures 1 and 2 show a waterproof sheet according to an embodiment of the present invention.This waterproof sheet 1 has a rubber sheet 3 capable of absorbing vibrations bonded and laminated on one surface of an impermeable sheet 2, and an impermeable rubber sheet 3. A waterproof sheet main body 5 formed by adhering and laminating a sheet-like vibration absorbing member 4 on the other surface of the water permeable sheet 2, and this waterproof sheet main body 5.
It consists of a water-permeable sheet 6 adhesively laminated to an absorbent member 4 of the present invention. Here, the sheet-like imaging absorbing member 4
, air is sealed between two plastic films 4a, 4a, and a large number of hollow disk bodies each having independent air y4b are arranged in a staggered manner at a predetermined distance from each other. There is.

In this case, plastic sheets such as polyethylene, polypropylene, polyvinyl chloride, and ethylene-vinyl acetate copolymer are suitable as the water-impermeable sheet, and these may be formed into a single layer or multiple layers with grooves. Among plastic sheets, sheets made of ethylene-vinyl acetate copolymer are particularly useful. The thickness of the water-impermeable sheet is not necessarily limited, but is 0.1 to 3 (g), especially 0.4
It is preferable to set it as -2 open.

In addition, natural rubber, synthetic rubber, and a mixture of these rubbers can be used as the rubber sheet, but among these, polynorbornene (PNB) has good vibration energy absorption performance.
) or a rubber sheet based on this, such as the product name ``Hanneite'' (manufactured by Naigai Rubber Co., Ltd.), is preferably used. The thickness of the rubber sheet is preferably 0.2 to 10!1TW11, particularly 0.2 to 0.8TW11.

Further, as a sheet-like vibration absorbing member having a large number of independent air chambers, for example, a plastic film known as the product name ``Air Cap J'' (manufactured by Ube Industries, Ltd.) can be used.

The height of the air chamber of this vibration absorbing member is 5 to 15R1.
Particularly preferred is 8-10%.

The total thickness of the waterproof sheet body can be about 4 to 50 days.

On the other hand, as water-permeable sheets, nonwoven fabrics made of synthetic resins such as polyethylene, polypropylene, polyester, and nylon, open-cell foams such as polyurethane, and water-permeable agents made of natural fibers can be used.
m, particularly preferably 3 to 5 fl.

The waterproof sheet of the above-mentioned embodiment is one in which, for example, the water-permeable sheet 6 is placed between the primary lining concrete and the secondary lining concrete and stretched on the primary lining concrete 1 side. As a result, spring water from the primary encasing concrete side flows down inside the water-permeable sheet 6 and is discharged. In this case, in this waterproof sheet, a vibration absorbing member 4 is placed on the primary lining concrete side with the impermeable sheet 2 in between, and a rubber seam 1-3 capable of absorbing vibration is placed on the secondary lining concrete side. - Even if vibrations from blasting etc. are transmitted from the next layer concrete side, there are many independent air chambers 4b.
Vibration is absorbed by the excellent cushioning effect of the seat 3, and vibration is also absorbed by the seat 3
Damage to the impermeable sheet 2 (h1 damage) is prevented, and the transmission of vibrations that could lead to spalling or destruction to the secondary lining concrete is prevented, and the secondary lining concrete and the tunnel body are reliably protected. It is something.

FIG. 3 shows another embodiment of the present invention, and this embodiment is a waterproof sheet in which a rubber sheet 3 capable of absorbing vibrations and a vibration absorbing member 4 are laminated in sequence on one surface of a water-impermeable sheet 2. It consists of a main body 5 and a water permeable sheet 6 laminated on the surface of the vibration absorbing member 4 of this main body 5, and this waterproof sheet 1 also has an excellent vibration resistance effect like the embodiment shown in FIG. It is something that demonstrates the.

Furthermore, FIG. 4 shows still another embodiment of the present invention, and this embodiment is shown in FIG. i@ is the embodiment shown in FIG. 1 in which the water permeable sheet 6 is partially attached to the vibration absorbing member 4.

Note that the other promotions and effects shown in FIG. 3.4 are the same as those shown in FIG. 1, so their explanation will be omitted.

Here, in the above-mentioned embodiment, the waterproof sheet main body is formed of a rubber sheet, a water-impermeable sheet, and a vibration-absorbing member, or a water-impermeable sheet, a rubber sheet, and a lift-absorbing member in the order f1.
Although the lamination order is not necessarily limited to the above embodiment, it is also possible to have a structure as shown in FIG. They may be used and laminated in an appropriate order, and the configuration thereof may be modified in various ways without departing from the gist of the present invention.

As described above, the waterproof sheet of the present invention is made by laminating together an impermeable plastic sheet, a vibration-absorbing rubber sheet, and a sheet-like vibration-absorbing member consisting of a large number of independent air chambers. Since the main body of the tarpaulin sheet is 11fl, it has excellent water resistance as well as waterproofness, and is therefore suitable for use as a civil engineering sheet for tunnels etc.

[Brief explanation of drawings]

FIG. 1 is a partially omitted sectional view showing one embodiment of the present invention, and FIG.
The drawings are a sectional view taken along the line U-4 in FIG. 1, FIG. 3 is a partially omitted sectional view showing another embodiment of the present invention, and FIGS. It is a partially cut-out 18 sectional view showing an example. 1... Waterproof sheet, 2... Water impermeable sheet, 3...
- Rubber sheet, 4... Vibration absorbing member, 4b... Independent air chamber, 5... Waterproof sheet body, 6... Water permeable sheet. Patent applicant Fujimori Kogyo Co., Ltd. Agent Ben 1
! l! t Takashi Kojima Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A waterproof sheet main body formed by laminating a water-impermeable plastic sheet, a vibration-absorbing rubber sheet, and a sheet-like vibration-absorbing member consisting of a large number of independent air chambers. A tarpaulin sheet featuring: 2. The waterproof sheet according to claim 1, wherein a water permeable sheet is laminated on one side of the waterproof sheet body.