JP3190952B2 - Repair method of impermeable 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 waste disposal site, and more particularly to a method for repairing a water-impervious sheet used in a disposal site.

[0002]

2. Description of the Related Art Waste is divided into industrial waste discharged from business activities and general waste mainly discharged from households. Final disposal of these wastes is landfill at sea or land. However, land reclamation is locally restricted, and land reclamation is common throughout the country.

[0003] In landfill disposal, the ground surface is cut into a concave shape, and a drainage pipe is installed on the ground with a slope at the bottom to remove leachate and distribute outside the disposal site. Has been laid.

[0004] The water-impervious sheet is formed of a synthetic rubber-based, synthetic resin-based, water-impervious material made of other polymer materials, a layered water-impervious material made of asphalt, rubber asphalt, clay lining, and other roofing materials. There is a sheet-like water barrier material used. In addition, the impermeable sheet made of these impermeable materials is not just a single sheet,
It is used in a jointed form via a joint.

[0005] The waste is dumped into the recess, compacted with, for example, a bulldozer, and sandwiched therewith with an intermediate soil covering, and the upper end is covered with a final soil to be used in a park or a sports field. .

[0006] However, in general, in such a disposal site, sheets are used so as not to be damaged by the pressure of the waste or to be chemically affected by the waste, but measures are taken in case of emergency. Need to be kept.

[0007] Water leakage due to such breakage of the waterproof sheet may affect the surrounding environment.

Therefore, it is necessary to detect a damaged portion.
Conventionally, a method of detecting the presence or absence of a broken part mainly by visual confirmation, a method of detecting the presence or absence of leakage by applying a pressure higher than the atmospheric pressure to the joint portion, or vice versa, detecting the presence or absence of leakage by suction A method of extracting a specimen and detecting the presence or absence of water leakage of the specimen by a laboratory test, a method of providing a ventilation layer as described in JP-B-6-47812, and blowing a gas into the ventilation layer. There is.

[0009]

However, the inspection method based on visual recognition has no certainty, and the method of inspecting the presence or absence of leakage by checking the fluctuation of air pressure can only perform a partial inspection in terms of equipment. However, the inspection of the specimen is the same as the sampling inspection, and it is not possible to perform an inspection that completely covers an extremely large whole part. Can not.

In any of the methods, even if a damaged portion can be detected, repairing the damaged portion requires a lot of trouble and time, such as digging and exposing and repairing the damaged portion.

An object of the present invention is to dissolve the inconveniences of the conventional example, to reliably detect breakage of the water-impervious sheet, and to easily and surely repair the breakage without specifying the damaged portion. It is an object of the present invention to provide a method for repairing a seepage control sheet in a material disposal site.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a drainage pipe for removing leachate to a bottom ground having an inclined surface and distributing it outside the disposal site, At the waste disposal site where the impermeable sheet to be laid is buried,
A monitoring dedicated pipe is arranged below the water impermeable sheet,
A water guide mat is laid in contact with the dedicated monitoring pipe, and when leachate leaked from the impermeable sheet is monitored on the dedicated monitoring pipe, the grout material is passed through the dedicated monitoring pipe to the leakage point of the impermeable sheet. Secondly, the grouting material is a silica sol-based grouting material having a relatively long gel time, and thirdly, the monitoring dedicated pipe has a plurality of water passages separated by ribs, and The gist of the present invention is that the flat tube is provided with a slit portion.

[0013]

According to the first aspect of the present invention, when water is leaked due to breakage of the water-impervious sheet, the leachate leaked from the water-impervious sheet is monitored by the dedicated monitoring pipe, and it can be detected that there is damage. However, the location cannot be identified,
Next, the water leakage route can be cut off by infiltrating the grout material to the leakage point of the impermeable sheet through a monitoring dedicated pipe.

[0014] In addition, by laying a water guide mat in contact with the monitoring pipe, when sewage in the disposal site leaks into the ground, it is guided to the monitoring pipe through the water guide mat. Can be.

According to the second aspect of the present invention, since the grout material is a silica sol-based strong grout material having a relatively long gel time, the grout material does not solidify for a relatively long time in the dedicated monitoring tube. When it flows out of this dedicated monitoring tube, it reacts with alkali and solidifies. Therefore, the uncured grout material in the monitoring-dedicated pipe can be reused by flushing it with water or the like.

According to the third aspect of the present invention, the monitoring-dedicated pipe can secure a large cross section of water through the rib structure, has excellent pressure resistance and tensile strength, withstands the earth pressure of high embankment, and has a drainage function. Can be secured.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a longitudinal sectional front view showing one embodiment of a method of repairing a seepage control sheet in a waste disposal site according to the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an enlarged sectional view of a part a in FIG. It is an expanded sectional view of the b part of FIG.

In the construction of the waste disposal site, excavation is performed so as to form the bottom ground, and ground shaping is performed. Then, a mixed soil 1 of bentonite and clay is applied to a thickness of about 30 cm.

Here, a dedicated monitoring pipe 2 is provided, and as shown in FIG. 8, a water guide mat 14 is laid thereon in contact therewith. Further, the mixed soil 1 is constructed thereon with a thickness of about 30 cm.

FIG. 5 shows the monitoring dedicated pipe 2 in which a large number of water passages 2b partitioned by ribs 2a are formed in parallel, and at least the upper surface has a slit portion 2 having an aperture ratio of about 50%.
This is a flat tube provided with c. The dedicated monitoring pipe 2 is disposed at an appropriate position in a circulating shape or a closed circuit as shown in FIG.

A water-impervious sheet 3 is laid, and a sheet protective material 4 made of a nonwoven fabric is laid on the water-absorbing sheet 3, and a poorly permeable protective soil 5 is applied thereon by about 50 cm to 100 cm. In the drawing, reference numeral 6 denotes a sheet fixing work for fixing an end of the water-impermeable sheet 3.

A leachate collecting and draining pipe was laid as a collecting pipe 7 for removing leachate and distributing it outside the disposal site, and crushed stones 8 generated locally were laid thereon.

The construction of the waste disposal site has been described above. The connection socket for connecting the injection hose 10 and the water pressure gauge cable 11 to the end of the dedicated monitoring pipe 2 as shown in FIGS. A cock 12 and a pressure gauge 13 were provided between the connection sockets 9 of the injection hose 10.

In the case where the impermeable sheet 3 is damaged in this way and there is water leakage, the water leak enters the monitoring dedicated pipe 2. When the leachate leaked from the impermeable sheet 3 to the monitoring pipe 2 is monitored by the water pressure gauge cable 11 connected to the data logger, the grout material is permeated to the leaking sheet leaking point via the monitoring pipe 2 by the injection hose 10. .

As the grout material, a silica sol-based grout material is preferable. This chemical solution has a relatively long gel time (consolidation time of grout) and relatively excellent long-term durability after consolidation. Moreover, it is completely solution-soluble and can penetrate even nonwoven fabrics.

The grout material is allowed to permeate to the leaking portion of the water-blocking sheet 3, reacts with the alkali at the time of flowing out of the dedicated monitoring pipe 2, solidifies, and cuts off the leak route. Further, since the grout material has not set in the monitoring dedicated pipe 2 for a relatively long time, the grout is washed away with water or the like so that the monitoring dedicated pipe 2 can be used.
Can be reused.

[0027]

As described above, the method of repairing a seepage control sheet in a waste disposal site according to the present invention can reliably detect breakage of a seepage control sheet, and can repair it without specifying the damaged part. It can be done easily and reliably.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing one embodiment of a method for repairing a seepage control sheet in a waste disposal site of the present invention.

FIG. 2 is a plan view showing one embodiment of a method of repairing a seepage control sheet in a waste disposal site of the present invention.

FIG. 3 is an enlarged cross-sectional view of a part a in FIG.

FIG. 4 is an enlarged sectional view of a portion b in FIG.

FIG. 5 is a perspective view of a dedicated monitoring pipe.

FIG. 6 is a plan view of a monitoring-dedicated pipe end;

FIG. 7 is a perspective view of a monitoring-dedicated tube end;

FIG. 8 is a vertical sectional side view of a main part of a waste disposal site.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mixed soil 2 ... Monitoring pipe 2a ... Rib 2b ... Water passage 2c ... Slit part 3 ... Waterproof sheet 4 ... Sheet protection material 5 ... Impervious protective soil 6 ... Sheet fixing work 7 ... Water collecting pipe 8 ... Crushed stone 9 ... Connection socket 10 ... Injection hose 11 ... Hydraulic pressure gauge cable 12 ... cock 13 ... Pressure gauge 14 ... Water transfer mat

Continued on the front page (72) Inventor Toshio Sato 1-7-5 Sekido, Tama-shi, Tokyo Inside Pacific Consultants Co., Ltd. (72) Inventor Michihiko Kumagai 8-14-14 Ginza, Chuo-ku, Tokyo Nittoku Construction Co., Ltd. (72) Inventor Masatsugu Eto 8-14-14 Ginza, Chuo-ku, Tokyo Nittoku Construction Co., Ltd. (56) References JP-A-61-109816 (JP, A) JP-A-6-106 226227 (JP, A) Special Table Hei 6-506010 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B09B 1/00 E02D 3/00 102 E02B 3/12-3/18 E02B 7/02

Claims (3)

(57) [Claims] 1. A waste disposal site in which a drainage pipe for removing leachate from a bottom ground having an inclined surface and distributing the water outside the disposal site, and a water-impervious sheet laid under the water-collection pipe are embedded in the waste disposal site. monitoring dedicated pipe and disposed below, the
Laying a water guide mat on the dedicated monitoring pipe
And, when the leachate leaking from water barrier sheet is monitored in the monitoring dedicated tube, barrier in landfills, characterized in that infiltrate grout through the monitoring dedicated pipe until water shield sheet leak location How to repair the water sheet. 2. The method according to claim 1, wherein the grout material is a silica sol grout material having a relatively long gel time. 3. The impermeable line in a waste disposal site according to claim 1, wherein the monitoring-dedicated pipe is a flat pipe having a plurality of water passages partitioned by ribs and provided with a slit at least on an upper surface. How to repair the sheet.