JPH03208917A - Execution method for water impermeable film wall - Google Patents

Abstract

PURPOSE:To secure the length of a lap of joint sections and to promote greatly execution efficiently by lapping the joint sections of water impermeable sheets between lengthwise plates arranged in a row in the direction of the length of a channel to the center in the belt shape channel to insert, and holding them with the lengthwise plates. CONSTITUTION:Lengthwise plates 4 and 4 arranged in a row in the direction of the length of a channel 1 at an interval are placed to the center in the belt shaped channel 1. After that, impermeable sheets 2 and 2 to form stopping projections 7 and 7 to the ends of joint sections 2a and 2a are inserted into the channel 1, both joint sections 2a and 2a are lapped between the lengthwise plates 4 and 4. At that time, the stopping projections 7 and 7 are projected outward of the lengthwise plates 4 and 4 so that the impermeable sheets 2 and 2 do not come off the lengthwise plates 4 and 4. Then, the lengthwise plates 4 and 4 are pushed to bring near to each other, and the joint sections 2a and 2a of the impermeable sheets 2 and 2 are held by the lengthwise plates to fix.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a water-blocking membrane wall using a water-blocking sheet for construction of underground dams, water-blocking walls of waste treatment plants, water-blocking walls of dams, etc. Regarding construction methods.

[Conventional technology]

Conventionally, methods such as chemical injection, concrete replacement, and in-situ stirring and mixing methods have been used to construct impermeable walls.

However, chemical injection methods, in-situ stirring and mixing methods, etc. require a large construction area (volume), which is disadvantageous in terms of workability and cost, and even if concrete replacement methods are used, cracks, etc. must be taken into consideration. need to be widened.

In order to solve this problem, in recent years, a water-shielding membrane wall construction method has been used in which a water-shielding sheet is inserted into a groove to construct a water-shielding wall. According to this construction method, high water-blocking properties can be ensured by using the water-blocking sheet even if the construction area is small.

FIG. 6 shows an outline of such a water-blocking membrane wall construction method, in which a trench is excavated with an excavator such as a chainsaw to form a band-shaped groove 1, a water-blocking sheet 2 is inserted into the band-shaped groove 1, and A filling material 3 such as mortar is poured into the gap.

The most suitable water-blocking sheet 2 is a sheet several millimeters thick made of non-woven fabric as a core material and coated with rubber asphalt, and as shown in the figure, it is rolled into a roll and pulled out into the band-shaped groove 1.

Further, the filling material 3 such as mortar may be filled with a tremie tube or the like.

[Problem to be solved by the invention]

By the way, when the water-shielding sheet 2 is at a shallow depth, it is fed out along a bar-shaped guide roller, and when the depth is deep, a weight such as a steel bar is attached to the lower end to let it fall. The width of the sheet 2 is narrow and the depth of the sheet 2 is large (and bending is likely to occur), so the tip of the sheet 2 may come into contact with the hole wall of the groove 1 or shift in the horizontal direction, making it impossible to insert it accurately. .

Furthermore, it is necessary to provide a joint part 2a in the water-shielding sheet 2 in order to provide continuity, and conventionally there are methods of adhering it by heat-sealing each other or applying an adhesive to the joint surface. This method requires large-scale equipment and cannot be used underwater or in muddy water.

In addition to this, if the depth is large, it is difficult to secure and manage the lap width of the joint portion 2a.

The purpose of the present invention is to solve the above-mentioned problems of the conventional example, and to provide a water-shielding membrane that allows a water-shielding sheet to be inserted smoothly and accurately to a predetermined depth in a band-shaped groove, and that allows the continuity of the water-shielding sheet to be easily and reliably obtained. Our goal is to provide wall construction methods.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a construction method for a water-blocking membrane wall in which a water-blocking sheet is inserted into a band-shaped groove and a filler is filled in the gap around the sheet. Longitudinal plates are arranged in parallel in the length direction of the groove, and the water-blocking sheet to be inserted into the groove is inserted by wrapping the joint part between the vertical plates, and pressing the vertical plates close to each other to form the water-blocking sheet joint part. The water-blocking sheet has a locking protrusion formed at the end of the joint, and the locking protrusion extends outward from the longitudinal plate.

[Effect]

According to the present invention, the water-blocking sheet is inserted into the strip groove by inserting the end joint part between the vertical plates, so the position is controlled by the vertical plates, and the lap length of the joint part can be ensured. .

In addition, to join the joints, simply press the vertically long plates close together and sandwich the water-shielding sheet joint (as crimping work is omitted, workability is greatly improved, and the impact of water, muddy water, etc.) I don't accept it either.

〔Example〕

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

1 to 3 are plan views showing one embodiment of the water-blocking membrane wall construction method of the present invention.

First, a trench is excavated in the ground using a conventional excavator (such as a chainsaw) to form a band-shaped groove 1, and vertically long plates 4 are placed in parallel in the length direction of the groove 1 with an interval in the center of the band-shaped groove 1. 6 The vertically long plates 4 are arranged at intervals that should connect water-blocking sheets 2, which will be described later, and the length of the vertically long plates 4 is the same as the depth of the strip groove l.

FIG. 4 shows an example of this vertically long plate 4. It is a sash-like board in which short pieces 4a are foldably bound together, and the short pieces 4a at the lower ends are connected with a spacing member 5 such as a bolt.

Suitable materials for the short pieces 4a include metal plates such as steel plates, wooden plates such as control panels, and other synthetic resin plates having appropriate hardness. Further, the short pieces 4a are connected to each other by a connecting tool 6 such as a ring or a coil.

As shown in FIG. 1, once two vertically long plates 4 are arranged in parallel and suspended into the strip groove 1, the water-blocking sheet 2 is then inserted into the strip groove l. As shown in FIG. 2, the joint portion 2a of the water-blocking sheet 2 is wrapped and inserted between the longitudinal plates 4.

A locking protrusion 7 is formed at the end of the joint portion 2a of the water-shielding sheet 2, and if this locking projection 7 is made to protrude outward from the vertically long plate 4, the water-shielding sheet 2 can be attached to the vertically long plate 4. By moving the locking protrusion 7 along the edge of the vertically long plate 4 without coming off, the water-blocking sheet 2 can be lowered easily and reliably.

Then, as shown in FIG. 3, a cylindrical body made of a civil engineering sheet 8 is arranged on the outside of the vertically long plate 4, and by pouring mortar 9 into this civil engineering sheet 8 and inflating it, it becomes vertically long as shown in FIG. Press the plates 4 so that they are close to each other, and seal the water-blocking sheet 2.
The joint portion 2a is sandwiched and fixed.

Note that the short pieces 4a at the lower ends connected by the spacer 5 such as bolts only form a chevron when their upper ends are close to each other, but in the upper part, the connecting portions of the short pieces 4a are free. It is bent and the water-blocking sheet 2 is easily sandwiched.

After the water-shielding sheets 2 are connected to each other via the longitudinal plates 4 in this manner, the gap between the outer periphery of the water-shielding sheets 2 and the strip groove 1 is filled with a filler 3 such as mortar.

〔Effect of the invention〕

As described above, in the water-blocking membrane wall construction method of the present invention, when a water-blocking sheet is inserted into a band-shaped groove and the surrounding gap is filled with a filling material such as mortar, the water-blocking sheet covers the joint part at the end. Since it is inserted into the band-shaped groove by inserting it between vertically long plates, the position is controlled by the vertically long plates, and the lap length of the joint portion can be ensured.

In addition, the joints of the water-shielding sheets can be joined together simply by pressing vertical plates close together and sandwiching the water-shielding sheet joints, and the conventional crimping work using adhesives is omitted, greatly improving workability. However, it is not affected by water or muddy water.

[Brief explanation of drawings]

Figures 1, 2, and 3 are plan views of each process showing one embodiment of the waterproof membrane wall construction method of the present invention, Figure 4 is a perspective view of the vertically long board used, and Figure 5 is the vertically long board Perspective view of the pressed proximity state, No. 6
The figure is a perspective view showing a conventional example. 1... Belt-shaped groove 2... Water-shielding seam) 2a... Joint portion 3... Filler 4... Longitudinal plate 4a... Short piece 5
... Spacing material 6 ... Connector 7 ... Locking protrusion 8 ... Civil engineering sheet 9 ... Mortar 'm1
Figure 4 Figure 2 Figure 2a (Hammer 4! field)

Claims (1)

[Claims] (1) In the method of constructing a water-blocking membrane wall in which a water-blocking sheet is inserted into a band-shaped groove and a filler is filled in the gap around it, the sheet is placed in the center of the band-shaped groove and parallel to the length of the groove with an interval. The water-shielding sheet is inserted into the groove with the joint portion wrapped between the vertical plates, and the vertical plates are pressed close to each other to sandwich and fix the water-shielding sheet joint portion. A construction method for water-proof membrane walls. (2) The method for constructing a water-shielding membrane wall according to claim 1, wherein the water-shielding sheet has a locking protrusion formed at the end of the joint portion, and the locking protrusion extends outward from the vertical plate.