JP4369065B2 - Compartment method for leak detection - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a partitioning method for water leakage detection that detects water leakage by dividing a partition in a water shielding structure such as a final disposal site or a reservoir.
[0002]
[Prior art]
The partition method for detecting water leakage of a water-impervious structure is to lay double water-impervious sheets a on the bottom and slope of the water-impervious structure, sandwich the permeable layer C between them, and pass through the permeable layer. This is a method of detecting leaking water by measuring leaking water or vacuum.
Conventionally, in order to detect the position of water leakage, the partition impermeable sheet b1 is installed and divided so as to block between the double impermeable sheets at the boundary positions of the sections (see FIG. 4).
Here, when the partition water-impervious sheet b1 is used, it is necessary to fix the upper water-impervious sheet a1 or the lower water-impervious sheet a2 and the partition impermeable sheet b1 by heat welding.
When performing this thermal welding with a machine, it is necessary to sandwich the two water-impervious sheets to be welded with rollers, so mechanical welding cannot be performed at that location, and manual welding is inferior in reliability. Then, welding is not performed, but it is processed at the factory.
Then, the boundary material b processed at the factory is delivered to the site as a processed product, and this is connected to the lower water-impervious sheet a2 and the upper water-impervious sheet a1 by thermal welding at the site (mainly machine) Welding).
[0003]
[Problems to be solved by the present invention]
The conventional partition method for detecting water leakage has the following problems.
<I> Since it is impossible to match the partitioning and the allocation of the water shielding sheet, when the partitioning water shielding sheet is used, two welding lines increase every time the partitioning is performed. Since the welding line tends to be a weak point in water shielding, increasing the number of welding lines is negative to maintain the water shielding performance.
Furthermore, complicated welds are generated at the four corners of the compartment, and there are many problems in terms of the welding method and water shielding performance.
<B> Temporarily, if it is going to weld the impermeable sheet for a partition on the spot, since it is difficult to pinch the impermeable sheets with a roller, implementation with a machine is difficult.
In addition, although it is not necessary to pinch with a roller if it is a manual work, workability | operativity is bad and it is difficult to maintain water-blocking performance.
In addition, if the joint between the water-impervious sheet and the partition water-impervious sheet is cut off, it can be sandwiched between rollers, but because the weld for extending the water-impervious sheet is the same place, that part is a three-layer weld It becomes a part and it becomes further difficult to maintain the water shielding performance.
[0004]
[Object of the present invention]
The present invention has been made to solve the conventional problems as described above, and provides a partition method for water leakage detection that can be carried out with a simple operation and can maintain the water shielding performance of the water shielding structure. Objective.
Moreover, it aims at providing the division method for the leak detection in which the leak detection with high reliability for every division is possible.
The present invention achieves at least one of these objects.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the partitioning method for water leakage detection according to the present invention detects a water leakage point by partitioning a water shielding structure laid with a multilayer water shielding layer at a predetermined interval. In the partitioning method for water leakage detection, an intermediate water shielding layer is provided between the upper water shielding layer and the lower water shielding layer, and the intermediate water shielding layer is disposed along the partition boundary, and the upper water shielding layer and the intermediate water shielding layer are disposed. Filler was filled between the water layer and between the middle and lower water-impervious layers, and the filler filled between the upper and lower impermeable layers with the intermediate impermeable layer sandwiched was projected from above The method is characterized in that it is arranged so that it does not overlap in some cases, the water flow between the compartments inside the water shielding layer is cut off, and a perforated pipe or a vent pipe is installed in each compartment.
[0006]
[Embodiments of the Invention]
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
<I> Application conditions The present invention is applied to a water-impervious structure 1 composed of multiple water-impervious layers.
For example, the present invention is applied to the water-impervious structure 1 constructed by laying two layers of water-impervious layers composed of an upper impermeable layer 11 and a lower impermeable layer 12 on the bottom surface and slope of a final disposal site or a reservoir.
A water-permeable material 3 is installed between the upper water-impervious layer 11 and the lower water-impervious layer 12 as necessary.
The water permeable material 3 guides the water infiltrated into the water shielding layer sandwiched between the upper water shielding layer 11 and the lower water shielding layer 12 to a predetermined place, and the flow of water or air inside the water shielding layer in the compartment. Install for the purpose of not blocking.
Water leakage can be detected by measuring the water leakage or the degree of vacuum flowing out through the water permeable material 3.
[0008]
<B> Filler Filler 2 is filled in a water shielding layer (for example, between the upper water shielding layer 11 and the lower water shielding layer 12) at a position corresponding to the partition boundary 6.
By filling the filler 2 between the water shielding layers, the flow of water between the compartments within the water shielding layer is blocked.
The material of the filler 2 is a butyl rubber adhesive sheet or filler, an asphalt adhesive sheet or filler, a urethane adhesive sheet or filler, a silicon adhesive sheet or filler, a urethane foam adhesive sheet or filler. (However, it is limited to closed cell foam), polyethylene foam adhesive sheet and filler (limited to closed cell foam), olefin foam adhesive sheet and filler (but closed cell foam) Limited).
Each section surrounded by the upper and lower impermeable layers (11, 12) and the filler 2 becomes a sealed space with the water permeable layer interposed therebetween.
The soundness of the water shielding layers (11, 12) for each section can be confirmed by detecting the degree of vacuum and water leakage in the sealed space.
[0009]
<C> Water leakage detection method When detecting the damage of the water shielding layer by the degree of vacuum, pipe the vent pipe installed in each section to the management facility, and depressurize each section (water permeable layer) through the vent pipe. Judge the damage of the water shielding sheet from the situation.
That is, if the water-impervious sheet is damaged and there is a hole, air, groundwater, or leachate flows from the hole, so that the reduced pressure state cannot be maintained.
[0010]
When detecting by water leakage, the perforated pipe 4 is installed in each section, and the perforated pipe 4 is connected to the water collecting pipe 5.
The water collecting pipe 5 is piped to a management facility such as a pit or a culvert provided in the landfill.
And the damage of the impermeable layer of each division is detected by the presence or absence of water leakage discharged from the water collecting pipe 5 and the water quality analysis.
That is, if the water shielding layer is damaged, groundwater and leachate enter the water permeable layer (water permeable material 3) in the compartment through the damaged portion. The infiltrated water leaks down the water-permeable material 3, flows into the perforated pipe 4, and is carried to a predetermined position by the water collecting pipe 5 connected to the perforated pipe 4. The presence or absence of damage to the water shielding layer can be determined by detecting the presence or absence of this water leakage.
Further, by analyzing the quality of the water discharged from the water collecting pipe 5, it can be determined whether it is groundwater, leachate or dew condensation water.
As a result, it can be determined in detail whether the lower water-impervious layer 12 is damaged, the upper water-impervious layer 11 is damaged, or whether the water-impervious layer is water-tight but water is flowing due to condensation.
[0011]
<D> Perforated tube The perforated tube 4 is a tube material having a plurality of holes 41.
The holes 41 are preferably provided at intervals in the axial direction of the perforated pipe 4 so that water leakage can be easily taken in. And it is preferable to provide except the position which becomes a surface and lower part which touch a ground when the perforated pipe | tube 4 is installed.
The hole 41 of the perforated pipe is a hole for taking in the water that has flowed through the water-permeable material 3 into the pipe. Therefore, it is better not to provide the hole 41 at a position where it becomes an obstacle to guide the taken-in water to a predetermined position. .
[0012]
<E> Other Embodiments Hereinafter, other embodiments will be described with reference to FIG.
In the structure of the partition boundary 6 as shown in FIG. 1 described above, when the impermeable structure 1 breaks through the filler 2, the water leaks out below the lower impermeable layer 12 without flowing through the impermeable layer. Therefore, water leakage cannot be detected.
For this reason, FIG. 3 shows a structure of the partition boundary 6 that can reliably detect water leakage even when the partition boundary 6 is damaged.
In the present embodiment, an intermediate impermeable layer 13 is provided between the upper impermeable layer 11 and the lower impermeable layer 12.
The intermediate water shielding layer 13 is disposed along the partition boundary 6.
Then, the filler 2 is filled between the upper impermeable layer 11 and the intermediate impermeable layer 13 and between the intermediate impermeable layer 13 and the lower impermeable layer 12.
In this case, the filler 2 filled between the upper and lower impermeable layers with the intermediate impermeable layer 13 interposed therebetween is prevented from overlapping when projected from above. That is, when the water-blocking structure 1 is broken so as to penetrate from the upper water-blocking layer 11 to the lower water-blocking layer 12, the water leakage always flows into the water-permeable material 3 in some section.
As a result, no matter where the water-impervious structure 1 is damaged, the water leaks into the water-permeable material 3 and the perforated pipe 4 in any section, so that the water leak can be detected.
[0013]
【Example】
Hereinafter, embodiments of a partitioning method for water leakage detection according to the present invention will be described with reference to the drawings.
[0014]
<I> Partitioning FIG. 2 shows an example in which the water-blocking structure 1 is partitioned.
In the partition boundary 6, the filler 2 is filled between the upper water shielding layer 11 and the lower water shielding layer 12. Here, as a filling method of the filler 2, a method of laying the upper impermeable layer 11 after applying the filler 2 to the lower impermeable layer 12 of the partition boundary 6, an upper impermeable layer 11 and a lower impermeable layer. A method of injecting the filler 2 between the layers 12 is conceivable.
Any of these methods can be carried out easily and does not impair the water shielding performance of the water shielding structure 1.
By filling the filler 2, the flow of water from the section A1 to the section B1 and the section A2 between the upper water shielding layer 11 and the lower water shielding layer 12 is blocked.
[0015]
<B> The perforated pipe 4 is installed along the partition boundary 6a at the downstream end in each pipe section.
In the present embodiment, the collection and drainage effect is enhanced by installing the perforated pipe 4 at the downstream end of each section.
For example, when water leaks somewhere in the section A1, the water leaks into the perforated pipe 4 through the water-permeable material 3. The leaked water that has flowed into the perforated pipe 4 flows out to the connected water collecting pipe 5 and is carried downstream by the water collecting pipe 5.
Here, when the method of collecting water at one point in the section is adopted, detection may be difficult if the water permeability of the portion is deteriorated due to loading of landfill waste or the like. However, if the method of collecting water leaks once at the downstream end in the compartment and draining with a perforated pipe 4 having a plurality of holes as in this embodiment, the water leak can be detected reliably.
When the water-impervious structure 1 is surrounded by a dam body and the water collecting pipe is connected to the outside of the dam body, a sheath pipe is passed in advance through the dam body at a location where the water collecting pipe 5 passes, and the water collecting pipe 5 is attached later. Piping is good. In this case, the water collecting pipe 5 can be replaced later.
[0016]
<C> Water leakage detection Water leakage is monitored with a control rod, etc., and water leakage from each water collecting pipe 5 is electrically continuously monitored, and the result is displayed on the management panel in the control room of the water treatment facility by lighting the lamp.
When water leakage is detected, the water quality is analyzed, and the result is a method of judging damage to the water shielding layers (11, 12).
[0017]
[Effect of the present invention]
Since the partitioning method for water leakage detection according to the present invention is as described above, the following effects can be obtained.
<I> The flow of water between the compartments in the water-impervious layer can be blocked only by filling the filler. For this reason, it can be easily carried out by partitioning work.
<B> Fill the partition boundary with a filler and do not perform thermal welding. For this reason, the water shielding performance inherent to the water shielding layer can be maintained without deteriorating the water shielding performance of the water shielding structure.
<C> Divide the water-impervious structure into several sections, and block the flow of water between the sections in the impermeable layer. For this reason, it is possible to detect water leakage with high reliability for each section.
[Brief description of the drawings]
FIG. 1 is a sectional view of a partition boundary of a water-blocking structure constructed by a partitioning method for water leakage detection according to the present invention. FIG. 2 is a plan view of an embodiment of a partitioning method for water leakage detection. Sectional view of the partition boundary according to the embodiment [FIG. 4] Cross-sectional view of the partition boundary of the conventional water shielding structure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Water-impervious structure 11 ... Upper side water-impervious layer 12 ... Lower side water-impervious layer A1, B1, C1, ... Section A2, B2, C2, ... Section 2 ... Filler 4 ... Existence Perforated pipe 6 ... partition boundary

Claims (1)

In the partitioning method for water leakage detection, which detects a water leakage point by partitioning a water shielding structure laid with a multilayer water shielding layer at a predetermined interval,
An intermediate impermeable layer is provided between the upper impermeable layer and the lower impermeable layer,
The intermediate impermeable layer is placed along the partition boundary,
Between the upper impermeable layer and the intermediate impermeable layer,
Fill the filler between the middle impermeable layer and the lower impermeable layer,
Place the filler filled between the upper and lower impermeable layers with the intermediate impermeable layer sandwiched so that it does not overlap when projected from above,
Block the flow of water between the compartments inside the impermeable layer,
It is characterized by installing a perforated pipe or a vent pipe for each section.
Compartment method for leak detection.

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