JP2003082655A - Construction method of steel sheet pile impervious wall and its joint section structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a steel sheet pile impervious wall and its joint section structure by engaging fitting sections formed in the steel sheet pile to constitute a joint section. SOLUTION: A water expansive waterstop is made to lie between the fitting sections, a water leak detecting space is provided at least to one side of the fitting sections in the joint section, and the water leak can be detected by detecting whether or no there is the water leak in the space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a steel sheet pile impermeable wall, which is laid mainly for the purpose of preventing diffusion of contaminated water flowing out from a waste disposal site or other contaminated soil, and a steel thereof The present invention relates to a joint structure applied to a joint between sheet piles. It should be noted that the word "leakage" is not limited to simply leaking water from the steel sheet pile impervious wall here, even if water containing a specific substance such as contaminated water, or even the specific substance itself flows out. Shall be used in combination.

[0002]

2. Description of the Related Art When a steel sheet pile is used as a water blocking wall in a waste disposal site, the joint portion of the steel sheet pile, especially the fitting portion,
By applying or pasting a water-swellable water blocking material in advance, driving the steel sheet pile into the ground, and filling the gap of the fitting part with the water blocking material that has expanded by reacting with moisture in the soil. Methods for preventing water leakage from the joint have been used (for example, JP-B-46-33977, JP-B-47-43612,
(See Japanese Examined Patent Publication No. 6-96688).

As an example, FIG. 4 illustrates a joint portion structure applied to a conventional steel sheet pile impermeable wall. Here, the water swellable water blocking material 5 is provided on the joint portion 2 of the steel sheet pile 1, particularly on the fitting portion 3.
Is applied or attached to block water leakage from the joint portion 2. Further, as shown in FIG. 5, the steel sheet pile 1
It is also practiced to provide a void in the joint portion 2 and to fill the void with a sealing material 7 such as mortar to further improve the water blocking performance.

[0004]

However, in these conventional methods, for example, the water-swellable water-stopping material comes into contact with the surrounding ground or comes into contact with the joint of the steel sheet pile that has been placed in advance, and peels off. Even if damage occurs due to, etc., because it is in the ground,
The damage could not be directly confirmed. Therefore, the only way to confirm water leakage due to damage is to drill a hole in the ground near the laid steel sheet pile wall and check if there is water leakage in the drilled hole.

Further, the cost of drilling the ground is high, the drilling location is limited from the economical point of view, and sufficient detection accuracy for water leakage cannot be obtained. Even if water leakage is detected, it is difficult to identify the location of water leakage on the steel sheet pile impermeable wall, so it is necessary to take measures against water leakage in a wide range, and efficient repair is required. Could not be done.

[0006] Furthermore, since the hole to be drilled in the ground must be located at a certain distance from the steel sheet pile impermeable wall, there is a time lag between the start of the leak at the impermeable wall and the actual detection of the leak. There was a problem that it occurred. Due to the time lag, there is a possibility that the leak has already spread over a wide area when the leak is detected. INDUSTRIAL APPLICABILITY The present invention makes it possible to easily and quickly detect water leakage at the joint portion after constructing a water impervious wall made of steel sheet pile, and further to reliably and economically repair the detected water leakage location. The present invention provides a method of constructing a steel sheet pile impermeable wall and a joint structure thereof.

[0007]

The present invention has solved the above problems by the method of constructing a steel sheet pile impermeable wall and the joint structure thereof described in the following items. A method for constructing a steel sheet pile water-impermeable wall in which a fitting portion formed on a steel sheet pile is meshed with each other to form a steel sheet pile water-impermeable wall by forming a joint portion. And a gap portion for water leakage detection is provided on at least one side of the fitting portion of the joint portion, and the presence or absence of water leakage in the gap portion is detected to detect the water leakage of the impermeable wall. A method of constructing a steel sheet pile impermeable wall, which is possible. The joint part has voids on both sides with respect to the fitting part, one of the voids is filled with a sealing material to perform a water stop treatment, and the other void is detected as a water leak. The method for constructing a steel sheet pile impermeable wall as described above, characterized in that it is a void portion for use. In the method for constructing a steel sheet pile impermeable wall as described above or further, further performing water leakage detection in the void portion provided for the water leakage detection, and when the water leakage is detected, the void portion is sealed with a sealing material. A method for constructing a steel sheet pile impermeable wall, characterized by stopping and blocking water leakage. A joint part structure between steel sheet piles for constructing a steel sheet pile impermeable wall, in which a water-swellable water-stopping material is interposed, and a fitting part which is fitted to each other, and at least with respect to the fitting part A joint part structure of a steel sheet pile, comprising: a gap part for detecting water leakage, which is provided on one side.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a method of constructing a steel sheet pile impermeable wall and a joint structure thereof according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of a joint structure of a steel sheet pile water-impermeable wall of the present invention. Further, the steel sheet pile impermeable wall is constructed, for example, by forming the joint portions 2 in combination as shown in FIG.

The structure of the joint portion shown in FIG. 1 will be described below. As shown in FIG. 1, the fitting portion 3 formed on the steel sheet pile 1
Then, the steel sheet piles 1 are fitted to each other and the joint portion 2 is formed. The water swellable water blocking material 5 is applied or attached to the fitting portion 3 so as to be interposed in the fitting portion. Here, it is preferable that the water blocking material 5 interposed in the fitting portion 3 is a water-swellable water blocking material, but a material that exhibits a predetermined water blocking performance (for example, a bituminous material, a urethane foam foam, etc.). It is needless to say that the method) may be arranged at the fitting portion position before the steel sheet pile is driven.

The joint portion 2 is provided with a gap portion 4 for detecting water leakage on at least one side of the fitting portion 3. Figure 1
In this case, the leak to be detected is the leak from the inside of the disposal site to the outside of the disposal site in the direction indicated by 6, and therefore the void portion 4 is provided at the position where the joint portion 2 communicates with the outside of the disposal site. In the impermeable wall formed in this way, water leakage from the joint part 2 is blocked by the water-swellable water blocking material 5, but even if water leakage occurs due to peeling or damage of the water blocking material. The leaked water first passes through the void 4. Therefore, the void 4
Water leakage can be detected by inspecting the water present inside.

In general, since the impermeable wall is buried in the soil, even if the impermeable walls are completely shielded from the inside and outside of the impermeable wall, the moisture content in the soil outside the impermeable wall causes Water often accumulates in the voids. In this case, the method of detecting water leakage in the void is to collect the water accumulated in the void and to use a specific substance contained in the water (that is, a substance that originally exists only inside the impermeable wall. Examples include a method of inspecting the presence / absence of substances that have leaked to the outside of the wall), a method of installing a sensor in a void and measuring a characteristic value derived from the presence of a specific substance such as PH. It is also possible to estimate the depth of the water leakage position by changing the detection position in the depth direction and performing inspection.

Although not shown here, when the direction of water leakage cannot be identified, a space for water leakage detection may be provided on both sides of the fitting portion in the joint portion. In this case, when the specific substance of interest is detected in the void portion on the side where it should not be detected, it is determined to be water leakage. Further, as another embodiment, for example, the fitting portion may be formed to have the shape shown in FIG. 3 (a), the joint portion 2 may be formed, and the steel sheet pile 1 may be combined to construct an impermeable wall. Further, as shown in FIG. 3B, one of the voids (here, the side leading to the disposal site) provided on both sides of the fitting portion 3 of the joint portion 2 is stopped with a sealing material 7 such as mortar. On the other hand, the other side (here, the side that leads to the outside of the disposal site) is the void portion 4 for water leakage detection.
By constructing an impermeable wall as described above, it is possible to further improve the water blocking performance of the joint portion 2.

By the way, the void portion 4 is located in the middle of the water leakage path of the joint portion 2, and its shape is not particularly limited as long as it has a size capable of performing water leakage detection and water stop processing. 10-80mm considering the ease of sensor installation and sampling
It is sufficient if the hose is large enough to accommodate the hose. The void portion 4 can also be obtained by removing the earth and sand clogged in the void portion after the steel sheet pile is driven, but a rod-shaped object matching the shape of the void portion is set in advance before driving and the void portion is It is preferable to prevent the intrusion of earth and sand into the ground, and to pull out the rod-shaped object to secure a void portion after the casting. In addition,
As this rod-shaped object, for example, a water jet hose or the like can be applied.

This water jet is water supplied for softening the ground near the tip of the steel sheet pile and facilitating the driving at the time of driving the steel sheet pile. On the other hand, when water leakage is detected in the void, it is preferable to fill the void with a sealing material such as mortar to block the water leakage. Further, it is also possible to perform a water stop treatment by injecting a chemical liquid for solidifying the ground, etc. by utilizing the voids and solidifying the ground around the joint portion.

According to the present invention, when water leakage is detected, it is possible to easily specify at which joint portion there is water leakage, and at which position in the depth direction of the water leakage portion there is water leakage. It is possible, and the range of water stopping treatment can be specified, and the water stopping treatment can be performed reliably and economically.

[0016]

According to the present invention, it becomes possible to detect a leak by specifying the leak location at the joint portion at the initial stage when the leak has started by utilizing the void portion for leak detection. Further, when water leakage is detected, the void portion can be used to perform a reliable and economical water stopping process.

[Brief description of drawings]

FIG. 1 is a schematic view showing a joint structure of a steel sheet pile impermeable wall of the present invention.

FIG. 2 is a schematic perspective view showing an impermeable wall constructed using the method for constructing a steel sheet pile impermeable wall of the present invention.

FIG. 3 is a schematic view showing another embodiment of the joint structure of the steel sheet pile impermeable wall of the present invention.

FIG. 4 is a schematic diagram showing a joint structure of a conventional steel sheet pile.

FIG. 5 is a schematic view showing another joint structure of a conventional steel sheet pile.

[Explanation of symbols]

1 steel sheet pile 2 joint 3 Fitting part 4 Void (for water leak detection) 5 (Water swelling) Water blocking material 6 Direction of water leakage (from disposal site, etc.) 7 Sealant (mortar) 10 Steel sheet pile impermeable wall

Claims (4)

[Claims] 1. A method for constructing a steel sheet pile water-impermeable wall in which fitting portions formed on a steel sheet pile are engaged with each other to form a steel sheet pile water-impermeable wall. The water blocking material is provided by interposing a swelling water blocking material, and a gap portion for detecting water leakage is provided on at least one side of the fitting portion with respect to the fitting portion. A method for constructing a steel sheet pile impermeable wall, which is capable of detecting water leakage on the wall. 2. The joint portion is provided with voids on both sides with respect to the fitting portion, one of the voids is filled with a sealing material to perform a water-stop treatment, and the other void. The method for constructing a steel sheet pile impermeable wall according to claim 1, wherein the part is a void for detecting water leakage. 3. The method of constructing a steel sheet pile impermeable wall according to claim 1 or 2, further comprising: detecting water leakage in the void portion provided for the water leakage detection, and detecting the water leakage. A method for constructing a steel sheet pile water-impermeable wall, which comprises sealing a void portion with a sealing material to block water leakage. 4. A fitting structure between steel sheet piles for constructing a steel sheet pile impermeable wall, in which a water-swellable water-stopping material is interposed and fitted with each other, and the fitting. And a gap portion for detecting water leakage, which is provided on at least one side of the portion, and a joint portion structure of a steel sheet pile.