JP3586744B2 - Construction method of impermeable wall - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is particularly useful for blocking the flow of groundwater to create structures underground, storing groundwater such as underground dams, and stopping the flow of pollutants such as industrial waste disposal sites. The present invention relates to a method for constructing a water impermeable wall made in such as.
[0002]
[Prior art]
As a conventional method of constructing this type of impermeable wall, for example, a hole for an underground wall is excavated by an excavator, and a reinforced concrete wall having a rigid and thick wall is buried in the hole, and the reinforced concrete wall is formed. There has been a method of constructing a water impermeable wall by a wall type continuous underground wall system which is continuously fixed and used as a water impermeable wall.
In addition, a plurality of columnar concrete pillars are vertically driven into the ground, and these concrete pillars are jointed to each other to form a waterproof wall. There was a construction method.
Furthermore, there is a method of constructing the impermeable wall by the mud solidification type thin impermeable wall method, but each has the following problems.
[0003]
[Problems to be solved by the invention]
That is, in the method of constructing the impermeable wall by the wall-type continuous underground wall method, since the wall is thick and heavy, it takes much time for transportation and construction, resulting in poor workability.
In addition, since the excavated soil amount is large, there is a problem that the number of work steps increases and the cost increases.
In addition, the method of constructing the impermeable wall using the column-type continuous underground wall method has a low joint performance in the vertical direction, so that water leaks easily from the joint joint, and the construction depth is limited, There were problems such as the limited use range.
Furthermore, the method of constructing the impermeable wall using the mud solidification type thin impermeable wall method has low rigidity, and when the ground is deformed, cracks are generated and the impermeable performance is deteriorated. There was a fear.
[0004]
[Means for Solving the Problems]
The method of constructing a water-impervious wall according to the present invention aims to solve the above-mentioned problems, and makes a thin vertical groove in the ground by excavating vertically with an excavator, and guides at both ends of the thin vertical groove. Attach the material, insert a water impervious plate having joints at both ends along the guide material, fill the vertical groove portions other than the joint part and the guide material with a water impervious material, The construction is completed, and then the construction of the other one of the preceding elements is completed at a predetermined distance in the same manner as the construction of the preceding element. A vertical thin groove is formed in the ground by excavating vertically, and a water-impervious plate having joints at both ends corresponding to the joints of the preceding elements is inserted along the joints of the preceding elements. After that, the corresponding joint portion and the vertical groove portion is filled with a water impervious material to complete the construction of the succeeding element, and a continuous impermeable wall is formed by repeating the construction of the preceding element and the succeeding element. It is characterized by being constructed.
[0005]
Further, in the method of constructing the impermeable wall according to the present invention, when the excavator is vertically excavated to form a thin vertical groove in the ground, while stabilizing the excavated vertical groove by filling a stable liquid. It is characterized in that a vertical groove is formed.
[0006]
【Example】
1 to 10 are explanatory diagrams for explaining a preferred embodiment of a method for constructing a water barrier according to the present invention.
Hereinafter, the construction procedure of the method for constructing the impermeable wall according to the present invention will be described in detail using the drawings.
[0007]
First, as shown in FIG. 1, a thin vertical groove 3 having ends 3 a, 3 a is formed in the underground 2 by, for example, excavating in a vertical direction by using a thin excavator 1 for thin impermeable walls.
At this time, the thin vertical groove 3 is filled with the stabilizing liquid 4 and the excavated thin vertical groove 3 can be stably formed by the stabilizing liquid 4 to form the thin vertical groove 3 with high accuracy to a large depth. it can.
The wall of the thin vertical groove 3 does not collapse due to the filled stabilizer 4.
[0008]
Next, as shown in FIG. 2, guide members 5, 5 having male joints 5a, 5a are attached to the ends 3a, 3a of the thin vertical groove 3 in the vertical direction, respectively. Next, as shown in FIG. 3, the water-impervious plate 6 made of a metal material such as steel or a synthetic resin material having female joint portions 6a, 6a in the shape of a square or a circle at both ends is connected to the guide material. Insert along 5,5.
The insertion direction is a vertical direction, and the male joints 5a, 5a of the guide members 5, 5 and the female joints 6a, 6a of the water shield plate 6 are arranged as shown in FIG. Supported.
[0009]
Next, as shown in FIG. 5, water blocking made of a muddy solidifying material or the like is inserted into the female joints 6 a and 6 a and the vertical grooves 3 other than the guide members 5 and 5 via an injection pipe (hose) 7. The material 8 is filled to complete the construction of one preceding element 9, but the water-blocking material 8 does not flow into the female joints 6a, 6a and the guide members 5, 5. This is because, as shown in FIG. 3, the leakage prevention sheet 10 is attached to a part of the vertical groove 3 by an appropriate means.
[0010]
Next, as shown in FIG. 6, at a predetermined arbitrary distance, the construction of another preceding element 9a is completed similarly to the construction of the preceding element 9.
Thereafter, the guide members 5 on the opposing sides of the preceding elements 9 and 9a are removed.
[0011]
Next, as shown in FIG. 7, between the preceding elements 9, 9a, the excavator 1 for excavating the thin impermeable wall is used to excavate vertically, and as shown in FIG. make.
At this time, the thin vertical groove 3 is filled with the stabilizing liquid 4, and the thin vertical groove 3 can be formed with high precision while stabilizing the excavated thin vertical groove 3 with the stabilizing liquid 4.
The wall of the thin vertical groove 3 does not collapse due to the filled stabilizer 4.
[0012]
Next, as shown in FIG. 9, in each of the preceding elements 9, 9a, a male joint 11a having a shape such as a pipe or a T-shape corresponding to the female joint 6a, 6a of the water shield plate 6, A water-blocking plate 11 made of a metal material such as steel or a synthetic resin material having both ends 11a is inserted along the female joint portions 6a, 6a of the preceding elements 9, 9a.
[0013]
Thereafter, as shown in FIG. 10, a filler such as non-shrinkable mortar or asphalt emulsion is injected into the corresponding female joints 6a, 6a and male joints 11a, 11a. To improve the water barrier performance.
In addition, the vertical groove 3 is filled with a water-blocking material 8 made of a solidifying material such as muddy water to complete the construction of the succeeding element 12.
A continuous impermeable wall 13 can be constructed by repeating the construction of the preceding element 9, 9a and the following element 12.
[0014]
Thus, according to the method of constructing the impermeable wall according to the present invention, for example, by combining a thin vertical groove made by a thin excavator dedicated to a thin impermeable wall, and a impermeable plate inserted into the thin vertical groove, A water impermeable wall having high water impermeable performance and excellent deformation performance can be constructed at low cost.
[0015]
FIGS. 11 and 12 are a plan view and a cross-sectional view showing an example of use of the impermeable wall constructed by the method for constructing the impermeable wall according to the present invention.
In the figure, 14 is an open caisson and 15 is an impermeable layer. Reference numeral 16 denotes a groundwater level.
The drawings shown in these figures show that when the open caisson 14 is constructed, the impermeable wall 13 constructed by the method of constructing the impermeable wall according to the present invention is disposed around the open caisson 14, and the open caisson 14 is installed. The aerial excavation is performed in a dry state.
[0016]
This open caisson aerial excavation method is a method of submerging a building constructed on the ground to form an underground structure.
When submerging in this manner, the impermeable wall 13 needs to have a deformability to deform the surrounding ground.
Therefore, by using the impermeable wall 13 having excellent deformation performance constructed by the method of constructing the impermeable wall according to the present invention, the construction of the open caisson can be performed safely and at low cost. .
[0017]
【The invention's effect】
According to the method of constructing the impermeable wall according to the present invention, the amount of excavated soil is smaller than that of the conventional method of constructing the impermeable wall using the continuous underground wall system, so that the number of work steps is reduced and the work period is shortened. This has the effect of reducing costs economically.
In addition, compared to the conventional method of constructing the impermeable wall using the column-type continuous underground wall method or the muddy solidification type thin impermeable wall method, since the construction depth is not limited, the range of use is expanded and the deformation performance is improved. Because of its superiority, even when deformation occurs in the ground, cracks and the like do not occur following the displacement of the surroundings, so that there is an effect that the water blocking performance is improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a state in which a thin vertical groove is excavated by an excavator in one embodiment of a method for constructing a water barrier according to the present invention.
FIG. 2 is an explanatory view showing a state where guide members are attached to both ends of a thin vertical groove.
FIG. 3 is an explanatory view showing a state in which a water shield plate is inserted along a guide member.
FIG. 4 is a partial plan view showing an inserted state of a water shield plate and a guide member.
FIG. 5 is an explanatory view showing a state in which a water-blocking material is filled in a vertical groove portion other than a joint portion and a guide member to complete the construction of a preceding element.
FIG. 6 is an explanatory view showing a state in which the construction of one preceding element has been completed, the construction of another one preceding element has been completed at a predetermined distance, and the guide material has been removed.
FIG. 7 is an explanatory diagram showing a state in which a thin vertical groove is excavated by a drilling machine between preceding elements.
FIG. 8 is an explanatory view showing a thin vertical groove excavated between preceding elements.
FIG. 9 is an explanatory view showing a state in which a water blocking plate is inserted into a thin vertical groove excavated between preceding elements.
FIG. 10 is an explanatory view showing a state in which a joint part and a vertical groove are filled with a water-blocking material to complete the construction of a succeeding element.
FIG. 11 is a plan view showing a usage example of the impermeable wall constructed by the method for constructing the impermeable wall according to the present invention.
FIG. 12 is a sectional view of the same.
[Explanation of symbols]
1 ... Excavator for thin impermeable walls,
2. Underground,
3 ... Thin vertical groove,
3a: end of the thin vertical groove 3
4: Stabilizing liquid,
5 ... guide material,
5a: male joint,
6 ... water barrier,
6a: female joint,
7 ... injection pipe (hose),
8 ... water barrier material,
9: preceding element,
9a: preceding element,
10: Leak prevention sheet,
11 ... impermeable board,
11a: male joint,
12 ... trailing element
13 ... impermeable wall,
14. Open caisson,
15 ... impermeable layer,
16 ... Groundwater level.

Claims (2)

Drilling vertically with an excavator to make a thin vertical groove in the ground,
Attach guide material to both ends of this thin vertical groove,
Insert a water shield having joints at both ends along the guide material,
Filled with water blocking material into the inner portion of the leakage preventing sheet of the vertical grooves to complete the construction of one of the preceding element,
Next, the construction of the other one preceding element is completed in the same manner as the construction of the preceding element at a predetermined distance,
Next, the guide material was removed, and a thin vertical groove was created underground by excavating vertically between these preceding elements by an excavator.
After inserting a water barrier plate having joints corresponding to the joints of the preceding elements at both ends along the joints of the preceding elements,
Filling the corresponding joint portion and the vertical groove portion with a water-impervious material to complete the construction of the following element,
A method for constructing a water-impervious wall, characterized in that a continuous water-impervious wall is constructed by repeating the construction of these preceding element and subsequent element. The construction method of the impermeable wall according to claim 1,
When making a thin vertical groove in the ground by excavating in the vertical direction with an excavator, the impermeable wall is made by filling a stable liquid and stabilizing the excavated vertical groove while forming the vertical groove. How to build.

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