JP2982569B2 - Method and structure for preventing leakage of sewage from seepage control sheet at waste disposal site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a structure for preventing leakage of sewage from a seepage control sheet in a waste disposal site. For preventing leakage of sewage leached from waste to the outside of the disposal site by separating the ground of the site from the waste dumping site in a watertight manner .

[0002]

2. Description of the Related Art In a landfill type waste disposal site for dumping industrial waste and general waste, in order to prevent sewage leaking from the disposal site from penetrating underground and causing environmental pollution,
It is obligatory to apply seepage control to the bottom of the disposal site. Conventionally, a method of laying a soft synthetic resin-based or rubber-based water-impervious sheet has been adopted as such a water-impervious work from the viewpoints of reliability, safety, workability, economy, and the like. That is, the soft water-impervious sheet has characteristics that it is hardly permeated by water and thus is superior in terms of water-impermeability as compared with other materials, and that it is easy to lay and excellent in economy.

On the other hand, in recent years, there has been a problem that the impermeable sheet laid at the waste disposal site is broken, and sewage flows out to pollute the surrounding environment. As a countermeasure against such problems, two-layered water-impervious sheets are used, and even if the upper-layer water-impervious sheet is torn, the other layers of water-impervious sheets prevent leakage of wastewater and increase safety. Is considered.

[0004]

However, in such a conventional method of enhancing safety by two-layered waterproofing sheet, the safety factor is increased by simply doubling the strength of the waterproofing sheet with a double structure. If only the upper layer impervious sheet is damaged and then the lower layer impervious sheet is damaged, the sewage will also leak out of the waste disposal site and avoid contaminating the surrounding environment. I couldn't do that.

Accordingly, the present invention has been made in view of the above-mentioned problem. In a waste disposal site using a water-impervious sheet, the upper water-impervious sheet is damaged during or after the landfill operation of the waste. At the time of the repair, the damaged part is repaired to increase the water barrier of the water barrier sheet, thereby preventing the leakage of wastewater from the water barrier sheet of the waste disposal site, which can improve the safety and reliability of the waste disposal site It is an object to provide a method and a prevention structure.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned object, and the gist of the present invention is to form a closed space between an upper sheet and a lower sheet having a double structure. A water-impervious sheet is laid on the bottom of the waste disposal site, the surface of the water-impervious sheet is covered with a powder, and a pressure-resistant tube, a pressure-resistant tube such as a pressure-resistant hose is connected to the gap,
After the introduction of the waste material, a method of vacuum-suctioning the inside of the gap through the pressure-resistant pipe to move the powdery material when the water-impervious sheet has a broken point so as to close the broken point. It is in.

[0007] Another aspect of the present invention is to provide a water-impervious sheet laid on the bottom ground, which divides the ground below the bottom from the waste dumping point above the bottom in a watertight manner, thereby leaching from the waste. In the structure for preventing leakage of sewage from a seepage control sheet in a waste disposal site that prevents contaminated water from leaking out of the disposal site, the seepage control sheet is laid so as to cover a bottom portion of the waste disposal site. Lower sheet,
An upper layer sheet that covers the lower layer sheet and is closely attached to the lower layer sheet along a predetermined divided section to form a bag body in each of the sections, and a bag formed by the lower layer sheet and the upper layer sheet. It consists of a mat member to be provided and a pressure-resistant tube connected to the inside of the bag, and a layer made of a powdery material is laid on the surface of the water-impervious sheet to a predetermined thickness.

[0008]

According to the method for preventing leakage of sewage from a seepage control sheet in a waste disposal site according to the present invention, a pressure-resistant tube is formed inside a void formed in a seepage control sheet laid on the bottom of the waste disposal site. When a broken portion is formed in the impermeable sheet, the sewage eluted from the waste is sucked into the gap through the damaged portion of the impermeable sheet. Due to the flow of the sucked sewage, the powder moves to the damaged portion, causing clogging and closing the damaged portion. Thereby, when the upper layer sheet is damaged, the damaged portion can be repaired.

According to the structure for preventing leakage of sewage from a seepage control sheet in waste disposal according to the present invention, a large number of bags are formed by partitioning a gap formed between an upper sheet and a lower sheet. In addition to performing vacuum suction, a mat member is disposed inside each bag body to maintain the interval between the upper and lower water impermeable sheets, so that when damage occurs, suction can be efficiently performed, Repair of a damaged part can be performed more accurately.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment in which a method for preventing leakage of sewage from a seepage control sheet in a waste disposal site according to the present invention is used in a waste disposal site 10. That is, the waste disposal site 10 is formed by excavating a vast site in a mountainous area or the like, for example, in a concave shape.
Is provided with a water-blocking sheet 13 having a double structure composed of an upper sheet 11 and a lower sheet 12.
Is provided with a water-blocking layer 14 made of a powdery material. A pressure-resistant tube is provided in a sealed space formed between the upper sheet 11 and the lower sheet 12.
When a pressure-resistant tube 16 such as a pressure-resistant hose is connected, and a broken portion occurs in the upper sheet 11, the inside of the gap is vacuum-evacuated through the pressure-resistant tube 16 to move the powdery material and close the damaged portion. To do.

In the waste disposal site 10 of this embodiment, the lower sheet 12 laid so as to cover the entire area of the concave bottom surface E of the waste disposal site 10 in a state where the impermeable sheet 13 is continuously integrated,
The lower sheet 12 is composed of a number of upper sheets 11 arranged in a matrix. These upper sheets 11
The lower sheet 12 is formed of, for example, a soft synthetic resin or rubber sheet member. Upper layer sheet 11
The outer peripheral portion is pressure-bonded to the upper surface of the lower layer sheet 12 or the already installed upper layer sheet 11 by heat welding, an adhesive, or the like, whereby the space between the lower layer sheet 12 and the upper layer sheet 11 is sealed. Bag 18 as a void
Are formed vertically and horizontally. In this manner, by forming the bag body 18 formed between the upper sheet 11 and the lower sheet 12 in a partitioned manner, vacuum suction when breakage occurs can be performed efficiently.

A sheet-like protective mat 15 made of, for example, a non-woven fabric is provided inside each bag 18. Accordingly, by disposing the protection mat 15 inside the bag body 18, the space between the upper and lower water impermeable sheets 11 and 12 can be maintained, and the vacuum suction can be performed more efficiently.

The powdery material laid on the water-blocking layer 14 is preferably insoluble and fluid, such as viscous soil, fly ash or bentonite.

Each of the bags 18 formed in a large number of sections in the vertical and horizontal directions has an opening 20 provided on one side thereof with a diameter of about 10 to 2 mm.
A pressure-resistant tube 16 made of a pressure-resistant tube of 0 mm is connected and extended to the surface G (see FIG. 1) on the outer periphery of the waste disposal site 10.

During the landfill operation of the waste or after the completion of the landfill, the upper layer sheet 11 of the impermeable sheet 13 is provided.
In the event that a break occurs, the damaged portion can be easily repaired. That is, since each of the formed bag bodies 18 is vacuum-sucked through the pressure-resistant tube 16, if a breakage occurs in the water-blocking sheet 13, the sewage eluted from the waste is removed by the water-blocking sheet 13. It is sucked into the bag body 18 through the damaged portion. Due to the flow of the sewage, the powdery material of the impermeable layer 14 moves to the damaged portion and causes clogging, thereby closing the damaged portion. Thereby, when the upper layer sheet 11 is damaged, the damaged portion can be repaired. Further, by continuing the vacuum suction, it is possible to prevent the sewage from leaking out by sucking up the sewage leaking from the damaged portion. At this time, the progress of repair of the damaged part can be grasped by detecting a decrease in the sucked sewage.

[0016]

As described above in detail, according to the method and structure for preventing leakage of sewage from a seepage control sheet in a waste disposal site according to the present invention, when a breakage occurs in the seepage control sheet, The powdery substance moves to the damaged portion due to the flow of the sewage sucked into the bag body through the damaged portion of the water-impervious sheet, causing clogging and closing the damaged portion. This makes it possible to repair the damaged portion when the upper layer sheet is broken, and as a result, it is possible to increase the water blocking of the water blocking sheet and improve the safety and reliability of the waste disposal site.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of a method for preventing leakage of sewage from a seepage control sheet in a waste disposal site according to the present invention.

FIG. 2 is a sectional view of a structure for preventing leakage of sewage from a seepage control sheet in a waste disposal site according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waste disposal site 11 Upper sheet 12 Lower sheet 13 Waterproof sheet 14 Waterproof layer 15 Protective mat 16 Pressure tube 18 Bag body E Bottom of recess

Continuation of front page (56) References JP-A-2-176012 (JP, A) JP-A-61-109816 (JP, A) JP-A-3-32790 (JP, A) JP-A-5-212364 (JP) JP-A-62-136285 (JP, A) JP-A-63-55093 (JP, A) JP-A-4-357207 (JP, A) JP-A-5-93412 (JP, A) JP-A-6-63525 (JP, A) JP-A-6-63526 (JP, A) JP-A-6-218343 (JP, A) Japanese Utility Model Application Showa 55-106221 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B09B 1/00 E02B 3/12 E02B 3/18

Claims (2)

(57) [Claims] 1. A water-impervious sheet having a closed space formed between an upper-layer sheet and a lower-layer sheet having a double structure is laid on the bottom of a waste disposal site, and the surface of the water-impervious sheet is powdered. Cover with a pressure-sensitive body, a pressure-resistant tube such as a pressure-resistant hose, a pressure-resistant hose, etc. are connected to the void, and after the waste is charged, by vacuum-suctioning the inside of the void through the pressure-resistant tube,
A method for preventing leakage of contaminated water from a water-impervious sheet in a waste disposal site, wherein when the water-impervious sheet is damaged, the powder is moved to close the damaged area. 2. A waterproof sheet laid on the bottom ground,
A water shielding sheet at a waste disposal site for preventing contaminated water leaching from waste from leaking out of the disposal site by partitioning the ground below the bottom surface from the waste dumping site above the ground in a watertight manner. In the structure for preventing leakage of sewage from, the water-blocking sheet is formed along a lower sheet laid to cover a bottom portion of the waste disposal site, and along a section divided into the lower sheet and the predetermined lower sheet. An upper sheet formed by forming a bag in each of the compartments in close contact with each other, a mat member disposed in the bag formed by the lower sheet and the upper sheet, and a pressure-resistant tube connected to the inside of the bag. A structure for preventing leakage of sewage from the seepage control sheet in a waste disposal site, wherein a layer made of a powdery material is laid on the surface of the seepage control sheet at a predetermined thickness.