JPH0786229B2 - Impermeable wall using impermeable sheet, construction method thereof, and impermeable sheet used for impermeable wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a water-impervious wall using an impermeable sheet in a construction project such as a dam, an underground tank, an industrial waste landfill, etc. The present invention relates to an impermeable sheet used for walls.

[Conventional technology]

Conventionally, the underground continuous wall construction method using reinforced concrete is generally used as a method of constructing an underground water barrier for preventing groundwater runoff and groundwater recharge, but this method is expensive and Since it does not follow the deformation, stress concentrates on the wall, and there are problems such as cracks and water leakage when an earthquake occurs.

In addition, research on impermeable walls using low-strength impermeable materials such as mud solidified materials, bentonite concrete, and asphalt concrete in place of reinforced concrete is also being conducted. Is small and has excellent followability to the deformation of the surrounding ground, but the problem of cracks and the cracks
It is unreliable because it may expand due to water permeation during its useful life of ~ 100 years, so methods such as inserting steel sheet piles are used to ensure water impermeability. However, if water is to be blocked in a deep area such as an underground dam, it is difficult to horizontally connect the steel sheet piles, and even if it can be inserted, there is a problem that it is considerably expensive.

Conventionally, in order to solve the above problems, vinyl chloride material,
A water barrier using a water impermeable sheet made of a flexible material such as a polyethylene material or a rubber material has been proposed. This will be explained with reference to FIG. 4. The impermeable wall is sandwiched between a partition iron plate 22 having a connection fitting 21 press-fitted into the excavation groove 20 and the connection fittings 21, 22 of the adjacent partition iron plates 22a, 22b. It is composed of a water impermeable sheet 23 and an injection material 25 which is injected and solidified between the adjacent partition iron plates 22a and 22b. The connection fitting 21 and the water impermeable sheet 23 are connected to each other by male and female joints.

The construction method will be explained. After the construction of the impermeable wall A on the left side of the partition iron plate 22a in the previous step in the figure is completed, the impermeable sheet 23 is partitioned into the excavation groove 20 filled with the mud 26.
It is lowered along the connection fitting 21 of 22a. Next, the connection fitting 21 of the partition iron plate 22b is lowered along the end of the water-impermeable sheet 23, and the injection material 25 is injected and solidified between the adjacent partition iron plates 22a and 22b, and then the grout is also inside the connection fitting 21. The water-impermeable wall B is formed by injecting and solidifying, and this method is sequentially repeated to form the water-impermeable wall.

Further, as shown in FIGS. 5 (a) and 5 (b),
A method of using a locking pipe instead of the partition iron plate has also been proposed. In FIG. 5 (a), the connecting fitting 27 is inserted into one end of the impermeable sheet 23, and the male fitting 29 of the locking pipe 28 is lowered along the female fitting of the connecting fitting 27 to inject the injected material.
After injecting and solidifying 25, pull out only the locking pipe 28,
Thereafter, this method is sequentially repeated to inject the grout into the joint portion of the connection fitting 27 and solidify it to form the impermeable wall.

Further, FIG. 5 (b) does not use the water-impermeable sheet 23 and the separate connection fitting 27 as shown in FIG. 5 (a).
A connecting fitting 30 made of a female joint is fixed to one end of 23, the male joint 29 provided on the locking pipe 28 is lowered along the female joint of the connecting fitting 30, and the injection material 25 is injected and solidified, and then only the locking pipe 28 is provided. Then, this method is sequentially repeated to inject grout into the joint portion of the connecting fitting 30 and solidify it to form a water-impervious wall.

[Problems to be solved by the invention]

In the impermeable wall using the conventional impermeable sheet, the role of the partition iron plate 22 and the locking pipe 28 is to seal the injection material 25 from mixing into the muddy water filled in the unconstructed space. However, the method of attaching the connecting fitting 21 to the partition iron plate 22 among the above-mentioned conventional examples has a problem that the partition iron plate is expensive and it takes too much time to inject grout.

Further, in the method of combining the locking pipe 28 and the connecting fittings 27 and 30, there is a problem that it takes time to insert the locking pipe. Especially, in the example of FIG. 5 (a), the connecting fitting 27 is pulled out when the locking pipe is pulled out. There is also a problem that they will be removed at the same time, and Fig. 5 (b)
In the above example, it is difficult to fix the water-impermeable sheet 23 and the connection fitting 30 to each other because they are made of different materials, and there is a problem in that they are unreliable for the field bonding.

Further, since the grout is injected and solidified in the joint portion between the impermeable sheets, there is a problem that water permeability occurs due to aging.

The present invention is to solve the above problems, by adding the function of a locking pipe to the impermeable sheet,
In addition to blocking the mixture of the injection material into the muddy water, construction efficiency,
Impermeable sheet for impermeable wall, which can improve cost and also improve sealing property of joint between impermeable sheets, impermeable wall using impermeable sheet, and construction method of impermeable wall The purpose is to provide.

[Means for solving problems]

For that purpose, the impermeable wall using the water-impermeable sheet of the present invention is an excavation groove, a water-impermeable sheet inserted into the excavation hole, and a male and a female provided at both ends of the water-impermeable sheet. A joint, a foldable locking bag attached to both sides of the water-impermeable sheet between the male and female joints, and an injection material injected into the locking bag and the trench. The method of constructing an impermeable wall of the invention is to insert a water-impermeable sheet having male and female joints at both ends in the excavation groove and inject and solidify the injected material in the excavation groove, and then insert the male and female joints of the impermeable sheet In a method of constructing a water-impervious wall by sequentially connecting, a folding rocking bag is attached to both sides of the water-impermeable sheet between the male and female joints of the water-impermeable sheet, and the folded rocking bag is attached. Inject material After sealing the excavation groove, a feature of injecting an injection material into the excavation groove, further the water-impermeable sheet used for the impermeable wall, with the male and female joints provided at both ends of the water-impermeable sheet, It is characterized in that a foldable locking bag is attached to both sides of the water-impermeable sheet between the male and female joints of the water-impermeable sheet.

[Action]

In the present invention, for example, as shown in FIGS. 2 and 3, the locking bags 7, 7 of the water impermeable sheet 6 are
When the low-strength water-impervious material 8 is injected into it, it expands as shown by the dotted line to seal the inside of the excavation groove 9 and to prevent the injected material from mixing into the muddy water 10. Will play the role of. Further, since the water-absorptive expansion member 5 absorbs water and expands at the joint portions of the adjacent sheets 1 and 1 ', the water-stopping property can be perfect.

〔Example〕

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

FIG. 1 is a view for explaining a construction sequence showing one embodiment of a method of constructing a water-impervious wall of the present invention, and FIG. 2 is a cross section showing one embodiment of an impermeable sheet for water-impervious wall of the present invention. FIG. 3 and FIG. 3 are views for explaining the action of the water-impermeable sheet impermeable sheet.
In the figure, 1 and 1'are water-impermeable sheets, 2 are male joints,
3 is a female joint, 5 is a water-absorbent expansion material, 6 is a water impermeable sheet, 7 is a locking bag, 8 and 11 are injection materials, 9 is a digging groove, and 10 is muddy water.

In FIG. 2, the water-impermeable sheets 1, 1'are made of a flexible material such as vinyl chloride-based material, polyethylene-based material, rubber-based material, thin steel plate, etc.
A male joint 2 is provided at one end and a female joint 3 is provided at the other end, and a water-absorption expansion member 5 made of rubber or the like is provided in the female joint 3. These male and female joints 2 and 3 are impermeable sheets 1,
It is fixed with the same type of material as 1 '. The impermeable sheets 1, 1'are connected to each other by, for example, aligning the female joint 3 of the sheet 1'above the male joint 2 of the sheet 1 and lowering the sheet 1 '. In the joint portion of ′, the water absorbing expansion member 5 absorbs water and expands, so that the water stopping property can be completed.

The water-impermeable sheet 1 is a sheet in which only the male joint 2 and the female joint 3 are provided on both ends, and a locking bag on both sides of the seat 1 between the male joint 2 and the female joint 3 as shown in FIG. A sheet 6 to which 7 and 7 are fixed is prepared. When the low-strength water-blocking material 8 such as mortar is injected into the locking bags 7, 7, the rocking bags 7 and 7 expand as shown by the dotted line in the drawing to seal the excavation groove 9 and prevent the injected material from mixing into the muddy water 10. Therefore, it plays a role of a conventional partition iron plate or a locking pipe.

Next, one embodiment of the method of constructing the impermeable wall of the present invention will be described with reference to FIG. 1. First, the excavation groove 9 for one cycle is excavated by a long wall drill machine, a grab, etc. In the filled excavation trench 9, the impermeable sheet 1
And the female joint 3 of the impermeable sheet 6 having the locking bag 7 above the male joint 2 of the sheet 1 is inserted, and the sheet 6 is inserted (). The impermeable sheet is hung by a crane. The water-impermeable sheet wound in a roll may be inserted while rotating. At this time, the locking bag 7 is in a folded state. Next, the injection material 8 is injected into the locking bag 7 (), the locking bag 7 is inflated as shown by the dotted line in the figure to seal the excavation groove 9, and then the injection material 11 is injected into the space A partitioned by the locking bag 7. To solidify or muddy water 10 in situ ().
When the impermeable wall is formed in the space A, the impermeable wall is constructed by excavating for the next cycle () and repeating the above-mentioned operations in sequence.

The present invention is not limited to the above embodiment, and various modifications can be made.

For example, in the above-mentioned embodiment, the seat 1 provided with only the male joint 2 and the female joint 3 on both ends, and the locking bags 7, 7 on both sides of the seat 1 between the male joint 2 and the female joint 3.
Although the sheets 6 to which is fixed are alternately connected, the water impermeable wall may be formed by connecting only the sheet 6 having the locking bag 7.

Further, in the above embodiment, the impermeable wall is formed by the impermeable sheet and the injection material, but the reinforcing bars are arranged on one side or both sides of the impermeable sheet, and by injecting mortar or concrete, The impermeable wall may be constructed so that it has the function of a structural wall.

Further, in the above-mentioned embodiment, the male and female joints 2 and 3 are fixed by the same kind of material as the water impermeable sheets 1 and 1 ', but a part of the male and female joints is made of a rigid material such as a reinforcing bar and a wire mesh. May be added. In this case, the impermeable sheets made of a flexible material can be easily connected to each other.

〔The invention's effect〕

As described above, according to the present invention, the partitioning function is added to the impermeable sheet to prevent the injection material from entering the muddy water with a simple structure, thereby eliminating the conventional partition iron plate and the locking pipe. Therefore, the construction efficiency can be improved and the cost can be reduced.

In addition, since the joint can be attached to the impermeable sheet in advance, the reliability of the product can be improved, and since the impermeable sheet and the joint are made of the same material, it is possible to easily and firmly fix them. Becomes

Furthermore, since the water-absorptive expansion member is used for the joint portion of the water-impermeable sheet to stop the joint water between the sheets, it is possible to improve the sealability of the joint portion, and at the The grout injection becomes unnecessary, and the construction efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a view for explaining a construction sequence showing one embodiment of a method of constructing a water-impervious wall of the present invention, and FIG. 2 is a cross section showing one embodiment of an impermeable sheet for water-impervious wall of the present invention. Fig. 3 is a diagram for explaining the action of the impermeable sheet for impermeable walls, and Fig. 4 and Fig. 5 (a) and Fig. (B) are conventional construction methods for impermeable walls. FIG. 1, 1 '... Impermeable sheet, 2 ... Male joint, 3 ... Female joint,
5 ... Water-absorbent expansion member, 6 ... Impermeable sheet, 7 ... Rocking bag, 8, 11 ... Injection material, 9 ... Excavation groove, 10 ... Muddy water.

Claims (6)

[Claims] 1. A digging groove, a water impermeable sheet inserted into the digging groove, a male and female joint provided at both ends of the impermeable sheet, and a water impermeable sheet between the male and female joints. A water-impermeable wall using a water-impermeable sheet, comprising a foldable locking bag attached to both sides and an injection material injected into the locking bag and the excavation groove. 2. A water-impermeable sheet having male and female joints at both ends is inserted into the excavation groove, an injection material is injected and solidified in the excavation groove, and then the male and female joints of the impermeable sheet are sequentially connected. In a method of constructing an impermeable wall, a folding locking bag is attached to both sides of the impermeable sheet between the male and female joints of the impermeable sheet, and the injection material is injected into the folded locking bag. A method of constructing an impermeable wall, comprising injecting an injection material into the excavation groove after sealing the excavation groove. 3. The water-impermeable sheet, wherein the water-impermeable sheet has only male and female joints at both ends, and a rocking bag folded on both sides of the water-impermeable sheet between the male and female joints. The method for constructing an impermeable wall according to claim 2, characterized in that it comprises a water-permeable sheet. 4. A male and female joint is provided at both ends of the water-impermeable sheet, and foldable locking bags are attached to both sides of the water-impermeable sheet between the male and female joints of the water-impermeable sheet. Impermeable sheet used for impermeable walls. 5. The water-impermeable sheet used for a water-impervious wall according to claim 4, wherein the water-impermeable sheet and the male / female joint are made of the same material. 6. A water impermeable sheet for use in a water impermeable wall according to claim 4 or 5, characterized in that a water absorbing expansion member is arranged in the female joint.