JPS632502Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is used for concrete lining in construction work,
For example, in the construction of tunnels, shafts, dams, underground structures, etc., prior to concrete lining, water-stop panels are applied to the concrete covering surface, especially non-woven fabric and a waterproof sheet with thermal adhesive properties laminated on one side of the panel. This invention relates to a water-stop panel made of a composite laminate with.

Such water-stop panels are already known and are useful for draining water behind the concrete lining and preventing cracks in the finished concrete lining, and due to its drainage properties, it has the advantage of not applying water pressure to the concrete lining after the concrete lining is completed. There is. Furthermore, since it is made of a composite laminate in which a nonwoven fabric and a waterproof sheet are laminated, construction is easier than when the nonwoven fabric and the waterproof sheet are applied separately.

However, conventionally known water-stop panels of this type have a structure in which a nonwoven fabric and a waterproof sheet are laminated and integrated over the entire structure, and it is difficult to obtain water-stop properties at the joints between the water-stop panels. On the front side of the seam of the water stop panel, which is attached to the concrete covering surface with the edges butted or partially overlapped, in other words, a heat-fusible waterproof tape is separately applied to the heat-fusible waterproof sheet to cover the concrete covering of tunnels, etc. Weld along the construction surface, or
Alternatively, fold the end of another water-stop panel in half along the concrete covering surface so that the nonwoven fabric is on the inside, and stack it on top of the end of the water-stop panel that was previously applied, with another waterproof tape interposed. However, when sealing the seams of water stop panels by welding in this way, it is difficult to weld the entire surface of the required area precisely due to the unevenness of the concrete coating surface, so the sealing performance is poor. I was a delinquent and won. If the sealing properties of the water stop panel joints are poor, water leakage will occur and the purpose of installing the water stop panel will be diminished.

This sealing problem may be solved if the ends of the tarpaulin sheet are left completely free from the nonwoven fabric over the required bandwidth. That is, according to this, the end zones of the separated waterproof sheets of adjacent water stop panels are overlapped with each other in a direction perpendicular to the concrete covering surface, so that the end zones are not affected by the unevenness of the concrete covering surface. It is possible to weld and seal the entire required area. However, in this case, in order to fit the waterproof sheet and the non-woven fabric, which have different flexibility and stiffness, to the unevenness of the concrete covering surface and apply the water-stop panel, it is necessary to It is preferable that the concrete is not completely laminated, but is partially integrated in spots, and the partial integration should be arranged in a fairly rough manner to correspond to the irregular distribution of unevenness on the concrete covering surface. Therefore, if the end zone of the tarpaulin sheet is simply released, the beginning of the free area of the end zone of the tarpaulin sheet will become uneven and irregular inward and outward.
When a waterproof panel is nailed onto a concrete covered surface, the edge bands of the waterproof sheet hang unevenly, making it difficult to align and overlap them for welding. Moreover, in order for the end zone of the tarpaulin sheet to be welded as desired without damage due to partial melting, it is desirable to have a correspondingly thick wall, and a tarpaulin sheet of such thickness is stiff. Therefore, it is more difficult to align and overlap.

Therefore, in the present invention, the loose end zone of the waterproof sheet is relatively thick, which is suitable for obtaining good welding work, and can be easily aligned and overlapped in the transverse direction to the concrete covering surface during welding. The idea is to provide water-stop panels that can.

To explain with reference to the drawings, the water stop panel of the present invention is composed of a composite laminate of a non-woven fabric 1 and a waterproof sheet 2 having heat-sealable properties laminated on one side of the non-woven fabric 1. , for example, is a water-stop panel placed on the primary lining surface of a tunnel ground, and the end zone 4 of the waterproof sheet 2 is thick so as to be suitable for welding, for example, about 0.8 mm or more, more preferably about 1.0 to 1.2 mm. The end zone 4 has a wall thickness of The outer edge of the end zone 4 is generally free from the nonwoven fabric 1.
It is sufficient that the length matches the edge of the nonwoven fabric 1, but if necessary, the outer edge may be made to have an extra length that protrudes an appropriate length from the edge of the nonwoven fabric 1. It is sufficient for the parts of the waterproof sheet 2 other than the end zone 4 to have a thickness thinner than the end zone 4;
The wall thickness may be the same as that of the end zone 4. In the figure, reference numeral 4a designates the integral part of the waterproof sheet 2 connected to the nonwoven fabric 1 on the starting end side of the free end band 4, which is continuously applied in the illustrated case. 5 indicates the needle.

In the water-stop panel of the present invention, the end band 4 of the waterproof sheet 2 is separated from the non-woven fabric 1, so the next water-stop panel is connected to the previous water-stop panel applied to the concrete covering surface 3. In this case, the end bands 4 of the waterproof sheet 2 of the water-stop panel can be stretched with excess (see Figure 2), so that the excess end bands 4 and 4 of the waterproof sheet 2 can be stretched. By overlapping and welding them in the transverse direction to the concrete covering surface 3, it is possible to reliably weld the entire surface of the required area without being affected by the unevenness of the concrete covering surface 3. Moreover, in the present invention, the end zone 4 of the waterproof sheet 2 is continuously or intermittently connected to the nonwoven fabric along the outer edge of the end only at the starting end side, so that the concrete covering surface 3 When a water-stop panel is applied to the end band 4, even if the waterproof sheet 2 other than the end band 4 is partially integrated with the nonwoven fabric 1, the end band 4 of the waterproof sheet 2 will hang down at the end. Although the end zone 4 is restricted to a regular band shape along the outer edge and therefore has a thick wall suitable for welding, it is easy to align and overlap the end zone 4 necessary for welding. guaranteed to be carried out.

[Brief explanation of drawings]

Figure 1 is a perspective view showing one embodiment of the present invention;
The figure is a longitudinal sectional view showing an example of construction using the water stop panel shown in FIG. 1. 1 is a non-woven fabric, 2 is a waterproof sheet, 3 is a concrete covered surface, 4 is an end zone of the waterproof sheet, 4a is a joint integrated part for the non-woven fabric on the starting end side of the end zone,
5 is a nail.

Claims (1)

[Scope of utility model registration request] A water-stop panel consisting of a composite laminate of a non-woven fabric and a heat-adhesive waterproof sheet laminated on one side of the non-woven fabric, and is placed on the concrete cladding surface prior to concrete lining, and the end zone of the waterproof sheet. is made thick so as to be suitable for welding, and the end zone is connected to the nonwoven fabric continuously or intermittently along the outer edge of the end only on the starting end side, and the other end zone is A water-stop panel whose entire area is free from the nonwoven fabric.