JP2807846B2 - How to stop water underground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground water stopping method having high water stopping performance.

[0002]

2. Description of the Related Art Since organic solvents such as trichloroethylene are harmful substances, it is necessary to prevent such harmful substances from leaking to unspecified areas in IC factories and precision machinery factories. Conventionally, concrete has been cast, or a concrete underground wall in which cement is mixed with the soil at the current position has been constructed, or a plastic sheet has been used.

[0003]

Problems to be Solved by the Invention The above-mentioned conventional water stopping technology has the following problems. <B> The method of coping with a concrete basement wall is economically burdensome, and there is still concern about the water stopping performance of the connection. In addition, since large-scale mechanical equipment is required for construction, it is difficult to construct around existing structures. <B> In the method using a plastic sheet, there is a problem in the connection structure of the sheets, and it is difficult to ensure the waterproofness of the connection portion.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an underground water stopping technology which is excellent in water stopping performance and workability.

[0005]

SUMMARY OF THE INVENTION The present invention uses a water-stop sheet having tubular portions formed at both ends, and comprises a plurality of holes spaced at regular intervals and a groove communicating between these holes, sequentially in units of elements. Excavating and inserting a cylindrical joint member into the hole one before the head of each element, the joint member has a slit continuous in the longitudinal direction of the peripheral surface, and a plate material that partitions the inner space is attached. Yes, insert the tubular portion of the waterproof sheet into each joint member of the adjacent element, fill the filler in the tubular portion, and make a surface contact between each joint member and the tubular portion of the waterproof sheet to sequentially form the waterproof sheet. Underground water stopping method characterized by extension

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. <A> Water stop sheet In the present invention, the following water stop sheet 1 is used in place of the conventional concrete wall. The water-stop sheet 1 is lightweight, has excellent chemical properties, microbial resistance, and water-stopping properties, and has high strength and high tearing properties while having appropriate elasticity.
Various non-toxic sheets known in the art, such as TTH-50 (manufactured by Hiraoka Orisen) and TTH-100 (manufactured by Hiraoka Orisen), can be used. As shown in FIG. 1, both ends of the water-stop sheet 1 are folded back and their ends are joined to form a cylindrical portion 2. As a joining method of the water blocking sheet 1, for example, fusion by hot air, high frequency, or the like is possible, but it goes without saying that various other known joining methods can be adopted according to other materials. The lateral length of the waterproof sheet 1 is determined by the element length. <B> Groove Excavator In the present invention, a known groove excavator capable of simultaneously excavating a plurality of holes 3 at a predetermined interval and a plurality of grooves 31 connecting the holes 3 is used.

[0007]

Next, a method of constructing the water stop wall will be described. <A> Excavation of Groove for Subsequent Element In FIG. 3, A is a preceding element, and a plurality of holes 3 and a plurality of grooves 31 continuously connecting these holes 3 are simultaneously excavated by a known groove excavator. ing. According to the present invention, the water cutoff wall is extended by sequentially constructing one element for each element. The leading hole 3 on the extension direction side of the water stop wall of the leading element A is left as it is, and the end of the leading water stopping sheet 1a is connected via the joint member 4 inserted into the hole 3 immediately before the leading end. I have. The connection method of the water stop sheet 1 will be described later. Then, as shown in FIG. 4, a plurality of holes 3 and grooves 31 for the following element B are excavated using the leading hole 3 of the preceding element A as a guide hole. Therefore, the leading hole 3 of the leading element A and the trailing hole 3 of the trailing element B overlap. The leading hole 3 of the succeeding element B is used as a guide hole for drilling the next element. <B> Inserting the water-stop sheet Insert the joint member 4 into the hole 3 immediately before the head of the following element B. As shown in FIG. 1, the joint member 4 includes a cylindrical body 42 having a pair of slits 41 continuous in the longitudinal direction of the peripheral surface, and a partition plate 43 arranged in the cylindrical body 42 in an X-shaped or I-shaped cross section. You. Then, the following water stop sheet 1b is laid between the joint members 4 set in the holes 3 of the preceding element A and the following element B.
That is, as shown in FIG. 1, each of the tubular portions 2 of the trailing water stopping sheet 1b is inserted into the tubular members 42 of the respective joint members 4 to a predetermined depth in a state where the tubular portions 2 are deflated, and between the tubular members 42 and the tubular portions 2. The injection tube 5 is located at the position. Also, care should be taken so that each cylindrical portion 2 does not come out of the slit 41 of the joint member 4. <C> Expansion of the cylinder Next, the filler 6 such as mortar is injected into the cylinder 2 of the trailing water-stop sheet 1b and expanded. Since the cylindrical portion 2 expands as the filling material 6 is injected, the cylindrical portion 2 comes into pressure contact with the inner surface of the joint member 4 to make surface contact. The expansion of the cylindrical portion 2 restricts the escape from the slit 41. Further, the groove 31 of the preceding element A is filled with mortar, bentonite mortar, or the like, so as to further secure water stoppage. At this time, in order to prevent mortar or bentonite mortar from wrapping around the following element B,
As shown in FIG. 1, it is preferable to stop the water with a grout packer 44 or the like. <D> Injection of expansion material Further, if necessary, an expansion material (not shown) is injected into a gap between the cylindrical portion 2 and the joint member 4 of the water-stop sheet 1b after being expanded using the injection pipe 5, and the two, 4 To improve the contact performance between them. The above steps are repeated to extend the water stop sheet 1 to the length in element units.

[0008]

As described above, the present invention has the following effects. <a> Compared with the conventional concrete water stop wall, the construction cost can be reduced and the construction period can be shortened. <B> The weakness of the water stopping property can be compensated by bringing the connecting portions of the water stopping sheet into surface contact, and thus complete water stopping is possible. Particularly, it is most suitable for stopping water of an organic solvent.

[Brief description of the drawings]

FIG. 1 is a plan view of a connection portion of a waterproof sheet

FIG. 2 is a plan view of a leading end of a preceding element value.

FIG. 3 is a plan view of the following element when drilling.

FIG. 4 is a plan view when a waterproof sheet is set on a succeeding element.

Claims (1)

(57) [Claims] 1. Using a water-stop sheet having cylindrical portions formed at both ends, a plurality of holes spaced at regular intervals and a groove communicating between these holes are sequentially excavated in units of an element, and one hole is formed from the top of each element. A cylindrical joint member is inserted into the hole on the front side, the joint member has a slit continuous in the longitudinal direction of the peripheral surface, and a plate material that partitions the inner space is attached, and each joint member of an adjacent element The cylindrical portion of the water-stop sheet is inserted thereinto, the filler is filled in the cylindrical portion, and the water-stop sheet is sequentially extended by making a surface contact between each joint member and the cylindrical portion of the water-stop sheet. Water stop method inside.