JP4185612B2 - How to install an electrode assembly at an existing waste disposal site - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrode body installation method in an existing waste disposal site.
[0002]
[Prior art]
With the recent increase in environmental protection awareness, various incidental works such as the creation of various waste disposal sites and the installation of water shielding sheets carried out during such construction, for example, exudation from the waste dumped in the waste disposal sites In order to eliminate the adverse effects on the surrounding environment, such as the contaminated water flowing out from the damaged part of the water shielding sheet and contaminating the groundwater, etc. Various technical approaches have been attempted from the direction, and various countermeasures have been taken against leakage of contaminated water due to breakage of the water shielding sheet after the construction of the waste disposal site.
[0003]
For example, in an existing waste disposal site where waste has already been dumped in a dumping pit, etc., a leak detection electrode for directly checking the location of the leak or visually detecting leaks from the damaged seat In order to install the body, a method is adopted in which the waste layer in the dumping pit is cut to a position just above the water shielding sheet and a leakage detection electrode body is installed. By conducting energization across the ground outside the water sheet, an electric circuit is formed at the location where the water shielding sheet is broken and water leakage occurs, and the water leakage detection electrode body detects water leakage.
[0004]
[Problems to be solved by the invention]
However, the conventional method has the following problems.
In other words, in order to detect water leakage that has occurred in an existing waste disposal site where waste dumping has already started, the waste layer in the dumping pit is opened and deleted using heavy equipment as described above. Leave, and install the electrode body for water leakage detection directly on the water shielding sheet, or if you just rely on visual inspection, remove the waste layer on a larger scale and expose the water shielding sheet in a fairly wide area The need to come up.
[0005]
As a result, the land used for the construction of waste disposal sites in recent years has been restricted from the beginning, and it is not always possible to secure a sufficiently large area. It is clear that the area to do this must be secured, and it is quite difficult to secure the site.
[0006]
In addition, a lot of transportation means such as various heavy excavators and dump trucks are arranged in the dumping pit of the existing waste disposal site where the dumping of waste has already started to cut the waste layer. In addition, there is a risk that the waste dumping work, which is the original work of the waste disposal site, may be reduced by operating these heavy machinery.
[0007]
In addition, since the conventional method requires large-scale excavation and a large number of heavy machinery, each of the above problems inherently has a problem that the construction period tends to be prolonged. This tends to increase the work cost.
[0008]
Therefore, the present invention has been made paying attention to such a conventional problem, and the leakage of contaminated water occurring in an existing waste disposal site can be achieved without excavating the waste layer formed by dumped waste. The present invention provides an electrode body installation method in an existing waste disposal site in which a detection electrode body can be easily and reliably placed on a waste layer.
[0009]
[Means for Solving the Problems]
The present invention has been made to achieve the above-mentioned object. Leakage from the waste layer of an existing waste disposal site is detected when the leaked water leaks from the damaged sheet to the outside of the sheet. A method of installing a sensing electrode body, wherein the waste layer is insulated with a predetermined planar arrangement pattern while maintaining a predetermined distance from the surface of the water shielding sheet laid on the bottom ground of the existing waste disposal site. A tubular body made of a material provided is placed, the electrode body is inserted and installed at a predetermined depth through the inside of the tubular body , and then the tubular body is left behind.
[0010]
In addition, as another gist, there is a method for installing a leak detection electrode body that detects when leachate from a waste layer of an existing waste disposal site leaks from the breakage point of the shield sheet to the outside of the shield sheet. A tip bit provided with an electrode body is detachably attached to the tip portion of the tube body, and a predetermined distance from the surface of the water shielding sheet laid on the bottom ground of the existing waste disposal site using the tube body And drilling the waste layer with a predetermined planar arrangement pattern, setting the tip bit at a predetermined depth, removing the tip bit from the tube and leaving it at the tip of the hole , It is characterized by removing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an explanatory diagram showing a situation where an electrode body is installed from a dumping pit of an existing waste disposal site using the electrode body installation method of the present invention.
[0012]
In the figure, the existing waste disposal site 10 is, for example, a general waste disposal site for dumping general waste, a hazardous waste disposal site for dumping hazardous waste mainly composed of industrial waste and containing hazardous substances, or It was created as a final disposal site.
[0013]
The existing waste disposal site 10 is laid on the bottom ground 11 of the existing waste disposal site 10 by appropriately bonding a water shielding sheet 20 made of, for example, synthetic resin or synthetic rubber, using a fusion means, an adhesive, or the like. Shall be.
[0014]
In the existing waste disposal site 10 having the structure as described above, in which waste is already dumped in the dump pit P and the waste layer W is formed, for example, penetration of the dumped waste by the convex portion or When damage to the water shielding sheet 20 such as tearing due to earth pressure generated due to ground displacement occurs, the contaminated water that has oozed out from the waste layer W passes through the damaged portion of the water shielding sheet 20 and external ground 11. Will leak water. Such leakage of contaminated water may directly lead to serious contamination of domestic water or industrial water such as well water and rivers used by neighboring residents. In order to monitor this, there is no leakage around the existing waste disposal site 10 Various measuring instruments are installed.
[0015]
When the leakage of contaminated water is detected in the vicinity of such an existing waste disposal site 10, or when there is a risk that it is necessary to investigate the damage of the water shielding sheet proactively, the existing waste disposal of the present invention The electrode body E for water leakage detection using the electrode body installation method in the field is installed.
[0016]
As an installation procedure of the electrode body E in the present invention, first, a drilling machine M such as a boring drilling machine or a rotary percussion drilling machine is disposed on the dumping pit P. Boring drilling machines are characterized by good transport accuracy such as cranes but good drilling accuracy, while rotary percussion drilling machines (eg grout drilling machines) are crawler-type and self-propelled. Since it is possible, it is easy to move and has excellent characteristics of drilling speed. It is appropriate to consider the geological status of the waste layer W formed in the dumping pit P, construction cost, construction period, etc. Selected.
[0017]
Next, a hole is drilled in the waste layer W by the hole drilling machine M described above. The drilling operation is performed at an appropriate interval in consideration of the planar shape and area of the bottom surface of the existing waste disposal site 10, and is performed in a rectangular mesh shape with an interval of about 7 to 10 m, for example. The depth of drilling is appropriately determined according to the leakage detection performance of the leakage detection electrode body E and the ground condition. In particular, the surface of the water shielding sheet 20 and the tip of the drilled hole should be kept at a predetermined interval. Considered.
[0018]
After completion of the drilling operation, for example, an electrically insulative vinyl chloride tube or the like is built as a tube T, and a leak detection electrode body E is inserted through the tube T to a predetermined depth of the waste layer W. Install. As another embodiment, for example, a steel casing is used as a tool used for drilling work, and after the drilling is completed, the leakage detection electrode body E is inserted and installed through the casing, and then the casing is pulled out and removed. is there.
[0019]
On the other hand, as shown in FIG. 2, there is a technique in which a tip bit 30 provided with an electrode body E is detachably attached to a tip portion of a casing as a tubular body T, and drilling is performed using the casing. . After drilling using this casing, for example, the direction of rotation of the casing is reversed or mechanically separated to leave only the tip bit at the tip of the hole, and the casing is pulled out and removed.
[0020]
If the leak detection electrode body E is installed immediately above the water shielding sheet 20 as described above and a predetermined plane arrangement pattern can be formed, then the constant current device 40 is installed on the ground, and the installation of the leaked water is completed. In addition to the detection electrode E, a ground electrode is provided, for example, on the outer edge of the existing waste disposal site 10 outside the water shielding sheet 20. In order to actually detect the water leakage location, power is supplied from the constant current device 40. If the water shielding sheet 20 is damaged, it becomes an electric circuit, and the water leakage detection electrode body E in the waste layer W is detected. Since the leakage current flows in a path from the ground through the damaged portion of the water shielding sheet 20 to the ground electrode grounded to the outer edge ground of the existing waste disposal site 10, the potential distribution changes at the damaged portion of the water shielding sheet 20 Thus, the water leakage detection electrode body E captures the potential distribution change.
[0021]
If breakage of the impermeable sheet 20 is found by the above water leakage inspection, it is possible to excavate the area around the damaged part to expose and repair the impermeable sheet 20, and minimize adverse effects on the surrounding environment. It becomes possible to suppress.
[0022]
In this embodiment, an example in which a boring hole drill or a rotary percussion type hole drilling machine is used as the hole drilling machine M is shown, but the present invention is not limited to this. For example, a hydraulic vibro machine is used, and a steel sheet pile or H steel is used. It is also possible to employ a method in which a steel material such as is placed together with the electrode body E.
[0023]
【The invention's effect】
As explained in detail above, according to the electrode body installation method in the existing waste disposal site of the present invention, in the existing waste disposal site where the dumping of waste has already started, large-scale excavation work Since the electrode body for water leakage detection can be installed easily and reliably without carrying out the waste, the waste layer in the dumping pit is removed and removed on a large scale using heavy machinery etc. There is no need to secure additional land for temporary storage.
[0024]
In addition, there are no various transportation equipment such as various excavators and dump trucks for excavating the waste layer in the dumping pit of the existing waste disposal site where the dumping of waste has already started. In addition to being able to reduce the cost of equipment used for work, there is little risk of hindering the waste dumping work, which is the original work of the waste disposal site.
[0025]
Therefore, there is no need for large-scale open-cut work and a large number of heavy machinery, work efficiency is good and the work period can be shortened, and the overall work cost such as equipment cost and labor cost can be reduced. Significant cost improvement can be realized.
In addition, by placing a tube made of a material having insulating properties in the waste layer, inserting and installing the electrode body at a predetermined depth through the inside of the tube, and then configuring the tube to leave, The tube body can protect the wiring of the electrode body, and can be insulated from the waste layer, so that the performance of the electrode body can be maintained.
Further, a tip bit provided with an electrode body is detachably attached to the tip portion of the tube body, and a hole is drilled in the waste layer using this tube body, the tip bit is set at a predetermined depth, and the tip bit is piped. By removing it from the body, leaving it at the tip of the hole, and removing the tube, it is possible to simultaneously drill holes in the waste layer and place the electrode body in the drilled holes. An electrode body can be installed in a well-drilled hole.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a situation where an electrode body is installed from a dumping pit of an existing waste disposal site using the electrode body installation method of the present invention.
FIG. 2 is an exploded view showing a mounting structure of a casing as a tubular body used when carrying out an electrode body installation method in an existing waste disposal site of the present invention and a bit provided with an electrode body attached to the tip of the casing. It is a side view.
[Explanation of symbols]
E Leakage detection electrode T Tube P Dumping pit W Waste layer 10 Existing waste disposal site 11 Bottom ground 20 Water shielding sheet 30 Tip bit 40 Constant current device

Claims (2)

It is a method of installing a leak detection electrode body that detects when leachate from the waste layer of an existing waste disposal site leaks out of the waterproof sheet from the damaged part of the waterproof sheet,
While maintaining a predetermined distance from the surface of the water shielding sheet laid on the bottom ground of the existing waste disposal site, a tubular body made of a material having an insulating property is placed on the waste layer with a predetermined planar arrangement pattern. An electrode body installation method in an existing waste disposal site, wherein the electrode body is inserted and installed at a predetermined depth through the inside of the pipe body , and then the tube body is left behind. It is a method of installing a leak detection electrode body that detects when leachate from the waste layer of an existing waste disposal site leaks out of the waterproof sheet from the damaged part of the waterproof sheet,
A tip bit having an electrode body is detachably attached to the tip portion of the tube body, and the tube body is used to provide a predetermined distance from the surface of the water shielding sheet laid on the bottom ground of the existing waste disposal site. While holding, drilling holes in the waste layer with a predetermined planar arrangement pattern, setting the tip bit at a predetermined depth, removing the tip bit from the tube and leaving it at the hole tip, the tube The electrode body installation method in the existing waste disposal site characterized by removing.

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