JPH09210832A - Water shielding structure, its water-leak detection method, water shielding sheet and water-leak-part repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water shielding structure which is safe without using a high voltage, whose maintenance is easy, which can grasp a water leak and water-leak position easily and surely and whose repair is easy and to provide its water-leak detection method, a water shielding sheet and a water-leak-part repair method. SOLUTION: A water shielding structure is provided with an inspection corridor 22 which is arranged and installed in a water-shielding construction part 18 and with a plurality of water-shielding-sheet sections 24a which are laid in a direction separated from the inspection corridor 22 by making use of the position of the inspection corridor 22 as the center and which cover the surface of the water-shielding construction part 18. Every water-shielding-sheet section 24a is formed in such a way that peripheral edge parts of two sheet bodies 32, 34 are sealed airtightly and that its inside is an independent communication state, and it is connected to the inside of the inspection corridor 22 on the basis of the inspection corridor 22 on the side of the inspection corridor 22 via water collected and injection pipes 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-blocking structure, a water-leakage detecting method therefor, a water-blocking sheet, and a water-leakage portion repairing method,
Particularly, the present invention relates to a water blocking structure having a water leakage preventing function for civil engineering, a water leak detecting method therefor, a water blocking sheet, and a water leak repairing method.

[0002]

BACKGROUND ART In recent years, a sheet waterproofing method has been widely adopted in civil engineering work and the like.

For example, in artificial ponds such as dams, regulating ponds, and reservoirs, water-blocking sheets are laid on the bottom and slopes to be used for water storage. In addition, at the final disposal site of waste, a water-blocking sheet is laid at the final disposal site so that sewage discharged from the waste, etc. can be prevented from flowing out into the soil.

However, if the impermeable sheet is damaged due to some cause and water leaks, the water storage efficiency will be lowered in the artificial ponds such as dams, regulating ponds, and ponds. Especially,
At the final disposal site of waste, there is a high possibility that harmful substances will elute and flow out into the soil, contaminating groundwater, and such a situation must be prevented.

Therefore, when a water leak occurs in the impermeable sheet, it is necessary to immediately discover the water leak and specify the leak position.

Therefore, conventionally, for example, as shown in FIG. 11, a large number of linear electrodes 2 and 3 are provided above and below the water-blocking sheet 1.
Is arranged. The upper linear electrode 2 and the lower linear electrode 3 are disposed above and below the water-blocking sheet 1 so as to be orthogonal to each other in the X-axis direction and the Y-axis direction. Then, as shown in FIG. 1A, first, a plurality of lower linear electrodes 3 are switched by a switch 5 to artificially create a direction of high electrical conductivity. Impermeable sheet 1 as shown
The magnitude of the current flowing between the electrodes 2 and 3 is measured by changing the direction by 90 degrees above and below, and the damage position is determined from the magnitude of the current.

Further, as disclosed in Japanese Patent Laid-Open No. 4-359130, current electrodes are installed inside the final disposal site and outside the final disposal site, and a voltage is applied to these current electrodes and the current is measured. The distribution status of the electric field is judged from the above, and if water leakage occurs, the resistance will decrease and the distribution status will change.Therefore, check the water leakage and use the measurement electrodes placed in the final disposal site to determine the water leakage position. It is known to detect.

Further, as disclosed in Japanese Patent Application Laid-Open No. 6-31261, a water barrier sheet is composed of at least two layers of sheet bodies, and partition walls are provided between these sheet bodies to form a plurality of spaces between the sheet bodies. By partitioning, it was possible to know approximately which part of the wide water-blocking sheet leaked, and at the time of repair, it was possible to check the leaked point by inspecting only the relevant space part. Things are known.

Further, as disclosed in Japanese Patent Laid-Open No. 6-63525, a large number of bags are divided into a plurality of compartments, and a lower layer sheet and an upper layer sheet are welded around each of the divided compartments. The formed double-layered water-blocking sheet, with a conductive wire and a solidifying agent injection pipe inside each bag, and detecting the damage point of the water-blocking sheet from the change in the resistance value of the conductive wire and injecting the solidifying agent. It is also known that a bag is used to inject a solidifying material into a bag to repair a damaged portion.

[0010]

In the above-described water leak detection shown in FIG. 11, the linear electrodes 2 are arranged on the upper surface of the water shield sheet 1, and the water shield sheet is also used. In many cases, sand or the like is laid on top of 1 to form a protective layer of the water-impervious sheet 1. In that case, when the sand or the like is leveled with a bulldozer or the like, the linear electrode 2 may be broken. If such a situation occurs, there is a problem that it is impossible to confirm the leak position. Further, if the linear electrode corrodes and breaks, the position of water leakage cannot be confirmed and maintenance is also difficult.

Further, in the water leak detection disclosed in Japanese Patent Laid-Open No. 4-359130, it is necessary to apply a high voltage to the current electrodes, and it is necessary to take measures to prevent electric shock from surroundings. When it is used in a disposal site, there is a problem that the distribution of electrodes changes depending on the type of waste, resulting in an error.

Furthermore, there is a problem that a leak cannot be confirmed due to a disconnection or the like, maintenance is difficult, and waste must be excavated at the time of repair, which makes repair work difficult.

Further, in the water leak detection disclosed in Japanese Patent Laid-Open No. 6-31261, it is difficult to detect the exact position of the water leak, and further, at the time of repair, the waste is excavated to block the water. There was a problem that repair work would be time-consuming because the construction had to be done with the seat exposed.

Furthermore, in the water leak detection disclosed in Japanese Patent Laid-Open No. 6-63525, since the damaged portion is detected and specified from the change in the resistance value due to the conductive wire, an abnormality such as disconnection is likely to occur in the conductive wire. However, there was a problem that the maintenance work in that case was also troublesome.

Further, in any of the above-described water leak detection methods, there is a problem that the water leak amount cannot be detected and the damage status cannot be confirmed.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to safely and easily grasp a leak and a leak position without using a high voltage. Another object of the present invention is to provide a water-impervious structure that can be easily repaired, a water leakage detection method therefor, a water-impervious sheet, and a water leakage portion repair method.

[0017]

In order to achieve the above-mentioned object, a water-impervious structure according to the invention of claim 1 comprises an inspection corridor arranged in a water-impervious construction section and a water-impervious construction section. On the surface,
A plurality of impermeable sheet sections that are laid in a direction away from the inspection corridor centering on the inspection corridor position and cover the surface of the water-impervious construction section, and each of the impermeable sheet sections is 2
It is characterized in that a peripheral portion of the sheet body is hermetically sealed so that the inside is independently communicated with each other, and is connected to the inside of the inspection gallery via a water collecting / injecting pipe on the inspection gallery side.

According to the present invention, since a plurality of water-impervious sheet sections which are covered by the water-impervious portion are formed by hermetically sealing the peripheral portions of the two sheet members, the water-impervious portion can be reliably shielded. Water can be supplied, and even if the upper sheet body is damaged, the lower sheet body ensures water impermeability, ensuring the intrusion of leachate into the water-shielded construction area. Can be prevented.

In addition, the impermeable sheet compartment is hermetically sealed at the peripheral portions of the two sheet bodies so that the interior is in independent communication with each other and is connected to the interior of the inspection corridor through the water collection / injection pipes. When water leaks from the upper sheet body due to damage to the sheet compartment, the leachate is collected through the inside of the water-blocking sheet compartment that is set to the independent communication state, and then the inside of the inspection corridor is collected by the water collection / income pipe. It is possible to confirm the damaged water-blocking sheet compartment, and it is possible to perform maintenance work from the inspection corridor, and to easily perform maintenance work without excavation work. it can.

Furthermore, when water leakage from the water-blocking sheet compartment is confirmed, it is possible to easily inject water-stopping material or the like into the water-blocking sheet zone that leaked from the inspection corridor via the water collection / injection pipe. The repair work can be performed, and further, the work such as excavation for the repair need not be performed, and the repair work can be performed easily and in a short time.

According to a second aspect of the present invention, in the first aspect, the inspection gallery is embedded in the water-shielded construction portion, and an upper surface portion is covered with the water-shielding sheet section.

According to the present invention, by embedding the inspection corridor in the impermeable construction section, the entire impermeable construction section can be covered with the impermeable sheet section, and reliable impermeable and leakage control can be performed. It can be done reliably.

According to a third aspect of the present invention, in the first or second aspect, the water-impeded construction portion is composed of a bottom surface and a slope, and the inspection gallery is the bottom center of the water-shielded construction portion. Is arranged over the longitudinal direction, and each of the impermeable sheet sections is arranged over at least a part of the slope from the bottom surface of the impermeable construction portion, and can form an independent block in the axial direction of the inspection corridor. It is characterized by being connected to.

According to the present invention, the impermeable sheet section is arranged over at least a part of the slope from the bottom surface of the impermeable construction portion, and is connected so that independent blocks can be formed in the axial direction of the inspection corridor. , It is possible to surely block water from at least part of the slope from the bottom of the water-shielded construction part, and when water leaks from the water-blocking sheet section, leak water in independent blocks in the axial direction. It is possible to grasp the impermeable sheet compartments that have been created, and it is possible to reliably repair the impermeable sheet compartments in blocks from the inside of the inspection corridor.

According to a fourth aspect of the present invention, in the third aspect, the water-shielded construction portion has a slope in which the bottom surface inclines downward from the slope position to the inspection corridor position.

According to the present invention, when the water-impervious sheet section is damaged due to the slope of the water-impervious construction section and leachate enters into the water-impervious sheet section, the water-impervious construction section is along the gradient. Since the impermeable sheet section is inclined, leachate can flow down to the inspection corridor along the inclination, and can be reliably guided to the inspection corridor through the water collection / injection pipes. It is possible to confirm the occurrence of water leakage, and it is possible to confirm the water leakage by a simple method without requiring a complicated structure for water leakage management.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, each of the impermeable sheet compartments is a pressure resistant drain material for forming a communicating portion between the two sheet bodies. A pair of cushion materials sandwiching the drain material from both sides are formed between the two sheet bodies, and the water collecting / injecting pipe is connected to the drain material.

According to the present invention, the pressure-resistant drain material can surely form the communicating portion between the two sheet bodies even when the water-impervious sheet section is overloaded, and the water-impervious sheet is protected. When the sheet compartment is damaged and the leachate enters the impermeable sheet, the leachate can be reliably collected through the communication part formed by this drain material to the side of the water collection / injection pipe, and the leakage condition You can be sure.

Further, by sandwiching the drain material with the pair of cushion materials from both sides, the two sheet bodies can be protected by the cushion material, and the sheet bodies are prevented from being damaged even when the top load is applied. It can be prevented and the durability of the waterproof sheet section can be improved.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a water pressure gauge is arranged in the water collecting / injecting pipe in the inspection corridor.

According to the present invention, it is possible to automatically confirm the occurrence of water leakage in the water-blocking sheet section by means of the water pressure gauge arranged in the water collection / injection pipe in the inspection corridor. You can be sure.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, an air vent pipe is disposed in the impermeable sheet compartment, and the air vent pipe is connected to the inspection corridor. Characterize.

According to the present invention, by disposing the air vent pipe in the water shield sheet compartment, the water shield sheet which is damaged by injecting the water blocking material into the water shield sheet compartment using the water collecting / injecting pipe When repairing a compartment, it is possible to inject the waterproof material while discharging the air in the waterproof sheet compartment from the air vent pipe, facilitating the injection of the waterproof material and reliably blocking the waterproof material. The entire water sheet compartment can be filled.

A waterproof sheet according to the invention of claim 8 is
A pair of water-impervious sheet bodies that are arranged face-to-face and whose periphery is sealed, a pair of cushion members that are face-to-face arranged between the pair of sheet members, and are sandwiched between the pair of cushion members, and A pressure-resistant drain material for forming a communicating portion between the sheet bodies, a water collecting / injecting pipe having one end exposed from one end side of the sheet body and connected to the drain material, and one end of the sheet It is characterized by comprising a plurality of water-blocking sheet sections, which are exposed from one end side of the body and have an air bleeder provided over substantially the entire length between the pair of sheet bodies.

According to the present invention, since the pair of water-blocking sheet members are used in the water-blocking sheet section, even if one sheet member is damaged and leachate is generated, the other sheet member can be used. It is possible to surely block water, and it is possible to obtain a water blocking sheet having high water blocking property.

Further, by arranging a pair of cushion materials facing each other between the seat bodies, the seat bodies can be received by the cushion materials, and the seat bodies are less likely to be damaged under the condition that an overload is applied to the seat bodies, resulting in durability. Will be improved.

Furthermore, by disposing a pressure-resistant drain material between the cushion materials, it is possible to secure a communicating portion between the sheet bodies, and in the case where the sheet body is damaged and infiltrated water enters, the drain material is formed. The leachate can be reliably collected through the communication portion formed by the above, and the water blocking material can be filled in the entire water blocking sheet compartment even when the water blocking material is injected.

Further, by disposing the water collecting / injecting pipe and the air bleeding pipe, it is possible to easily take out the leachate and inject the water blocking material, and moreover, the water blocking sheet at the time of injecting the water blocking material. By discharging the air in the compartment, it is possible to reliably fill the waterproof sheet compartment with the water blocking material when the water blocking material is injected.

According to a ninth aspect of the present invention, there is provided a method for detecting water leakage in a water-impervious structure, wherein an inspection corridor disposed in a water-impervious construction section and the two sheet bodies are hermetically sealed so that the inside is independently communicated. A method of detecting water leakage in a water-impervious structure, comprising: a plurality of water-impervious sheet compartments, which are in communication with the inside of the audit corridor via a water / injection pipe and are arranged from the audit corridor to the surface of the impermeable construction part. Then, when the sheet body of any one of the plurality of water-blocking sheet sections is damaged, the leachate is guided from the damaged portion into the space between the sheet bodies, and between the sheet bodies. The guided leachate is moved between the sheet bodies by the inclination of the impermeable construction part, is guided to the water collecting / injecting pipe side, and is guided to the water collecting / injecting pipe side. To the inside of the inspection corridor through the water collection / injection pipe, and by the leachate guided into the inspection corridor, And detecting the leakage of the water shield sheet compartment caused the loss.

According to the present invention, the damage state can be surely detected in the inspection corridor for each water shielding sheet section.

According to a tenth aspect of the present invention, in the ninth aspect, a water pressure gauge is installed in the water collecting / injecting pipe in the inspection corridor, and the water impermeability introduced into the inspection corridor by the water collecting / injecting pipe. The leakage of water is detected by the water pressure of the leachate in the seat section acting on the water pressure gauge.

According to the present invention, it is possible to automatically confirm the leakage of water in the impermeable sheet section by the water pressure gauge in the inspection corridor, and it is possible to easily and surely perform the leakage control.

According to the eleventh aspect of the present invention, there is provided a water leak repairing method, wherein after confirming the water leak by the water leak detecting method of the water blocking structure according to the ninth or tenth aspect, the waterproofing material injection device is provided in the inspection corridor. To connect to the water collection / injection pipe of the water-blocking sheet compartment where leakage has occurred, and the water-stopping material injection device evacuates the water-collection / injection pipe to stop water in the water-blocking sheet compartment. Water blocking is performed by injecting a material, filling the water blocking sheet with the water blocking sheet and solidifying the water blocking sheet.

According to the present invention, after confirming leakage of water in the impermeable sheet compartment, a water blocking material is injected into the impermeable sheet compartment from the water collecting / injecting pipe to fill the entire impermeable sheet compartment with the water blocking material. Therefore, it is possible to easily and reliably repair the water leak portion in a short time.

According to a twelfth aspect of the present invention, in the eleventh aspect, an air vent pipe is provided in the water-blocking sheet compartment, the air vent pipe is connected to the inspection corridor, and the water collecting / injecting pipe is connected to the air intake pipe. When injecting the water blocking material into the water blocking sheet compartment, the water blocking material is injected while bleeding air in the water blocking sheet area from the air vent pipe.

According to the present invention, at the time of injecting the water blocking material into the water blocking sheet compartment, the water blocking material is injected while bleeding the air in the water blocking sheet area from the air vent pipe to inject the water blocking material. In addition, it is possible to reliably fill the entire waterproof sheet compartment with the waterproof material.

A thirteenth aspect of the present invention is characterized in that, in the eleventh or twelfth aspect, the water blocking material has a gel time sufficient to fill the water blocking sheet compartment.

According to the present invention, it is possible to inject the water blocking material until the water blocking material is surely filled in the water blocking sheet compartment, and the water blocking material is solidified on the way and becomes unfillable. Can be reliably prevented.

The fourteenth aspect of the present invention provides the eleventh aspect to the first aspect.
In any one of 3 above, the injection amount of the water blocking material is such that a sufficient water blocking solidified product can be formed around the outside of the damaged portion of the water blocking sheet section.

According to the present invention, at the time of injecting the water blocking material, the water blocking sheet can be spread to the outer periphery of the damaged portion and the damaged portion can be reliably repaired to maintain the water impermeability.

[0051]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 to FIG. 11 are views showing a state in which the water-impervious structure of the present invention is used in a final waste disposal site according to one embodiment.

The waste final disposal site 10 according to this embodiment has a bottom surface 14 and slopes 16a and 16b shown in FIG.
The water-impervious construction portion 18 is formed.

As shown in FIGS. 8 and 9, the bottom surface 14 is in a state in which a slope is formed in the direction of arrow A, which slopes downward from the position of the slope 16a toward the center. The slopes 16a, 16b are the slopes 16a, 16b, 16
A small step portion 20 is continuously formed between b and 16b to form an annular shape.

The inspection corridor 22, the first water-impervious sheet 24, and the second water-impervious sheet 26 are disposed in the water-impervious construction portion 18 formed in this way to form a water-impervious structure. I'm trying to build.

As shown in FIG. 1, FIG. 2, FIG. 7, FIG. 8 and FIG. 9, the inspection corridor 22 is formed into a substantially rectangular cross section by reinforced concrete construction, etc.
Is buried over almost the entire length in the longitudinal direction of the central portion, which is the lowest position of the descending inclination, and the upper surface portion thereof has substantially the same height as the bottom surface 14.

Further, one end of the inspection corridor 22 is formed in a T shape as shown in FIG. 1, and the other end is exposed to the ground as shown in FIG.

Furthermore, two drainage grooves 28 are formed on the bottom surface of the inspection corridor 22 along the side wall so that the water in the inspection corridor 22 can be discharged to the outside and a ventilation pipe 30 is provided. The inside of the inspection corridor 22 can be ventilated.

As shown in FIGS. 1, 2, 8 and 9, the first water-impervious sheet 24 covers the bottom surface 14 and the lowermost slope 16a of the water-impervious construction section 18, and the second water-impervious sheet 24 Impermeable sheet 26
Covers from the lowest step 20 to the highest step 16b.

The first impermeable sheet 24 has a plurality of impermeable sheet compartments 24a. As shown in FIG. 5, the impermeable sheet compartments 24a are composed of upper and lower two sheets arranged facing each other. Bodies 32 and 34, and cushioning members 36 of two upper and lower portions which are sandwiched between these sheet bodies 32 and 34 and are arranged to face each other.
38 and the drain material 40 and the like disposed between the cushion materials 36, 38 are laminated, and a water collecting / injecting pipe 42 and an air vent pipe 44 are integrally formed as shown in FIG. ing.

The upper and lower sheet bodies 32 and 34 are made of long sheets, and are made of a material having water-blocking property and flexibility, such as polyethylene (PE), ethylene vinyl acetate copolymer (EVA), polypropylene ( Synthetic resin system such as PP), ethylene propylene diene monomer (E
Synthetic rubber such as PDM) and butyl rubber, or asphalt rubber can be used. In addition, it is preferable to use a material that can be heat-sealed.

The upper and lower cushion members 36 and 38 protect the upper and lower sheet members 32 and 34, respectively.
Even if a certain amount of force is applied to the surfaces of the sheet bodies 32 and 34 by the waste 74 or the like, the sheet bodies 32 and 34 have such a thickness and elasticity that they can be absorbed and the damage to the sheet bodies 32 and 34 can be prevented. It is necessary. Nonwoven fabrics are used as the cushion members 36 and 38 in the present embodiment. It is also possible to use a material such as a flexible foam material instead of this non-woven fabric.

Further, in this embodiment, the cushion material 38 on the lower side is thicker than the cushion material 36 on the upper side.

As shown in FIG. 6, the drain member 40 is for forming the communicating portion 46 between the sheet bodies 32 and 34. As shown in FIG. 6, the drain member 40 is regularly formed in an uneven shape at predetermined intervals. It is a high pressure resistant drainage material in which a water-permeable filter 52 is attached to both surfaces of a sheet-shaped core material 50 in which water passage holes 48 are formed.

The sheet-shaped core material 50 is in a state in which a plastic sheet (high-density polyethylene sheet) which is regularly formed in an uneven shape is covered with a polypropylene non-woven fabric.

As the drain material 40, in addition to the material shown in FIG. 6, it is also possible to use plastic nets overlaid to ensure water permeability.

Then, as shown in FIG.
2, 34, cushion materials 36, 38 and drain material 40
In the laminated state, the peripheral portions of the upper and lower sheet bodies 32 and 34 are hermetically sealed, and the inside is formed as an independent communication state.

When sealing the peripheral portions of the sheet bodies 32 and 34, for example, a material of the same quality as that of the sheet bodies 32 and 34 is disposed on the peripheral portions, and the upper and lower sheet bodies 32 and 34 are heat-sealed.
It is sealed by fixing to.

The water collecting / injecting pipe 42 is used as the water-blocking sheet section 24.
It is for taking out the leachate that has invaded into a and for injecting the water blocking material into the water blocking sheet section 24a. As shown in FIG. 3, two water blocking sheet sections are provided on one end side of the water blocking sheet section 24a. It is in a state of

Each of the water collecting / injecting pipes 42 is connected to the drain member 40 with one end thereof being exposed from the lower sheet body 34.

The air vent pipe 44 is for discharging the air in the water blocking sheet section 24a when the water blocking material is injected into the water blocking sheet section 24a from the water collecting / injecting tube 42.
As shown in FIG. 2, two water-impervious sheet sections 24a are provided in both side portions in the longitudinal direction over substantially the entire length of the side edges.

Further, one end of the air vent pipe 44 is exposed from one end of the lower sheet body 34.

Furthermore, the water collection / injection pipe 44 and the air vent pipe 44 are formed of pressure-resistant flexible hoses. In addition, the water collection / injection pipe 42 and the air vent pipe 44
The sheet body 34 on the lower side of the mounting portion is formed thicker than the other portions in order to improve the strength of the mounting portion.

When the water-blocking sheet section 24a thus formed is disposed in the water-blocking construction portion 18, the slopes 16a, 16 including the bottom surface 14 and the stepped portion 20 are provided.
As shown in FIG. 5, the cushion material 53 having the same thickness as the cushion material 38 on the lower side is spread over the surface of b, and as shown in FIGS. One end of the water-blocking sheet section 24a is located, one ends of the water collection / injection pipe 42 and the air vent pipe 44 are connected to the upper and lower parts of the inspection corridor 22, and the other end side of the bottom face 14 in the direction away from the inspection corridor 22 and In addition to being laid on the slope 16a, a plurality of water blocking sheet sections 24a are connected in the axial direction of the inspection corridor 22 so that each water blocking sheet section 24a forms an independent individual block.

In the T-shaped portion formed at one end of the inspection corridor 22, the impermeable sheet sections 24a are similarly formed and the impermeable sheet sections 24a are connected to each other. The water blocking sheet sections 24a are connected to each other by heat fusion.

The second water-impervious sheet 26 includes a sheet body 32,
It is composed of a long sheet made of the same material as 34,
It is arranged so as to cover the slope 16b including the small step portion 20, and the first water shield sheet 24 and the second water shield sheets 26 are connected by heat fusion.

In this way, the water-impervious construction section 18 is
As shown in FIGS. 8 and 9, protective sand 54 is applied to a predetermined thickness on the first impermeable sheet 24 and the second impermeable sheet 26 that cover the surface of the first impermeable sheet 24. Also, the second water shield sheet 26 is protected.

As shown in FIG. 10, a drainage pipe 56 is provided in the protective sand 54, and the leachate in the final waste disposal site 10 is discharged to the leachate water reservoir 58 formed in the surrounding area. The leachate reservoir 58 is subjected to water treatment in a water treatment facility 60 and then discharged into a river 62 or the like.

In the inspection corridor 22, FIGS.
As shown in, when the water pressure gauge 64 is attached to the water collecting / injecting pipe 42 and the water blocking sheet section 24a is damaged, the leachate that has entered the water blocking sheet section 24a is
The water pressure acts on the water pressure gauge 64 through
It is designed to detect leaks. Further, a measurement cable 66 is connected to the water pressure gauge 64, and the presence / absence of water leakage can be monitored at an external management office (not shown) via the measurement cable 66.

Further, in this embodiment, the pipe corridor 22 is used as a storage tank for the leachate from the final waste disposal site 10 in an emergency.

That is, as shown in FIG.
2 and the leachate reservoir 58 and the drainage pipe 56 are connected to allow drainage from the drainage pipe 56 to the pipe corridor 22 and drainage from the pipe corridor 22 to the leachate reservoir 58.

For example, if both the upper and lower sheet bodies 32 and 34 of the water-blocking sheet compartment 24a are damaged, most of the leaked water will collect in the pipe corridor 22 through the first water-blocking sheet 24 due to the pressure, and especially At the time of heavy rain, the amount of water leakage is large and the amount of leachate from the final waste disposal site 10 is also large. Therefore, the capacity of the leachate water reservoir 58 may be exceeded. In this case, water leakage from the first impermeable sheet 24 may occur. The water can be temporarily stored in the inspection corridor 22.

Even if the first water-blocking sheet 24 is not damaged, if heavy rain exceeding the design rainfall may cause rainwater to overflow from the waste final disposal site 10,
The inspection corridor 22 is used as a water tank to prevent rainwater overflow.

Next, a method of detecting water leakage and a method of repairing a water leakage portion using the above-described water shielding structure will be described.

First, the sheet bodies 32 and 34 of one of the water-impermeable sheet compartments 24a among the plurality of water-impermeable sheet compartments 24a.
When the breakage occurs, as shown in FIG. 8, for example, when the upper sheet body 32 has the breakage 70, the breakage 70
Therefore, the leachate enters between the sheet bodies 32 and 34.

The leachate that has entered between the sheet bodies 32 and 34 flows down to the side of the inspection corridor 22 as indicated by the arrow in the figure due to the gradient formed on the bottom surface 14 of the water-shielded portion 18.

In this case, in the water-blocking sheet compartment 24a, since the outer peripheries of the upper and lower sheet bodies 32 and 34 are hermetically sealed and the drain member 40 forms the communicating portion 46 inside, the damaged portion is damaged. First impermeable sheet 24 with 70
Through the communication part 46, it surely flows down to the inspection corridor 22 side.

In this case, since the drain material 40 is made pressure resistant, it is not crushed by the top load and the communication portion 46 can be reliably secured.

The inspection corridor 22 is placed in the water-blocking sheet section 24a.
The leachate that has moved to the side is connected to the drain member 40 and is connected to the upper surface of the inspection corridor 22.
Will be guided inside.

The leachate introduced into the water collection / injection pipe 42 is
It is guided into the inspection corridor 22 through the water collection / injection pipe 42,
Water pressure gauge 64 attached to the water collection / injection pipe 42 of the inspection corridor 22
The water pressure acts on the water pressure gauge 64, and the water pressure gauge 64 detects the water leakage of the impermeable sheet section 24a.

The detection value detected by the water pressure gauge 64 is sent to an external control office (not shown) via the measurement cable 66 in the inspection corridor 22, and the control office monitors the presence or absence of water leakage.

In this case, if the value of the water pressure gauge 64 increases, there is a possibility that water leakage will occur in the impermeable sheet compartment 24a. Therefore, the impermeable sheet compartment 24 in the inspection corridor 22.
It is preferable to open the valve of the water collection / injection pipe 42 of a to visually check the presence or absence of water leakage.

In this way, the plurality of water-blocking sheet sections 24a
By detecting the presence or absence of water leakage in each block of the water blocking sheet section 24a, it is possible to detect water leakage with a simple structure without providing special piping or the like.

Next, after confirming the presence or absence of water leakage, as shown in FIG. 9, the waterproofing material injection device 72 is carried into the inspection corridor 22 to collect water on one side of the impermeable sheet section 24a where the water leakage has occurred.・ Remove the water pressure gauge 64 from the injection pipe 42 and collect the water.
The water blocking material injection device 72 is connected to the injection pipe 42.

Then, the water blocking material injection device 72 injects the water blocking material into the water blocking sheet section 24a through the water injection / injection pipe 42.

When injecting this waterproofing material, the inspection corridor 22
The air vent pipe 44 therein is opened, and the water blocking material is injected at a predetermined pressure while bleeding the air in the water blocking sheet compartment 24a to fill the entire water blocking sheet compartment 24a with the water blocking material.

In this case, since the air vent pipe 44 has a length extending over the entire length of the impermeable sheet section 24a, the water blocking material is injected from only one direction of the end of the impermeable sheet section 24a on the inspection gallery side. However, the waterproofing material can be surely injected into the end side away from the inspection corridor 22, and since the two air vent pipes 44 are provided, it is considered that one air vent pipe 44 is clogged. Also, the air in the water blocking sheet section 24a can be reliably discharged by the other air vent pipe. Further, by injecting the water blocking material while discharging the air in the water blocking sheet section 24a through the air vent pipe 44, the water blocking material can be injected easily and reliably.

Here, as the water blocking material, one having a gel time sufficient to fill the water blocking sheet compartment 24a with the water blocking material, that is, by using a low viscosity water blocking material, It is ensured that the entire waterproof sheet section 24a can be filled.

Specifically, a water-blocking material containing a hydrophilic urethane prepolymer as a main component is mixed and dispersed with water at an arbitrary ratio, melted, and directly reacted with water to form a gel, which is rubber-like. It uses a gel that forms a water-containing gel and has a water-stopping effect.

The amount of water blocking material injected is such that a sufficient amount of the water blocking solidified material 74 can be formed around the outside of the damaged portion of the water-blocking sheet section 24a so that water leakage at the damaged portion 70 can be reliably prevented. There is.

For example, a water blocking material having a gel time of 45 to 90 minutes is desirable, and specifically, a temperature of 20 ° C. as shown in FIG.
The gel time of about 60 minutes can be adopted under the conditions of, and depending on the area of one impermeable sheet section, the water collection / injection pipe 42
Set the number of.

After the water blocking material is sufficiently injected into the water-blocking sheet compartment 24a, the water blocking material injection device 72 is removed from the water collecting / injecting tube 42, and the water collecting / injecting tube 42 and the air vent tube 44 are removed. If it is blocked and solidified, the impermeable sheet section 24a where water has leaked can be easily and quickly repaired in block units.

In this way, after repairing the impermeable sheet section 24a in which water has leaked, another impermeable sheet section 24a is repaired.
When water leaks in a, it can be easily repaired by repeating the same steps as described above. Also,
Even if water leaks again after repairing, since it is a rubber-elastic water-containing gel water-stopping material, re-injection creates a gap between the water-stopping material and the sheet body to form a water-stopping material. It is possible to fill.

The present invention is not limited to the above-mentioned embodiments, but can be modified into various embodiments within the scope of the gist of the present invention.

For example, the arrangement of the inspection corridor is not limited to the above-mentioned embodiment, but various combinations can be made according to its use.

Further, the water-impervious structure of the present invention can be applied not only to the final disposal site of waste but also to regulating ponds, dams and the like.

Furthermore, not only when excavating the ground surface,
It can also be used as a water-impervious structure when it is raised on the ground surface.

[0108]

[Brief description of drawings]

FIG. 1 is a perspective state sectional view showing a waste disposal site according to an embodiment using a water-impervious structure of the present invention.

FIG. 2 is a partially enlarged perspective view showing the relationship between the inspection gallery and the water-blocking sheet section of FIG.

FIG. 3 is a plan view showing a water collecting / injecting pipe and an air vent pipe of the water blocking sheet section in the state of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG.

5 is a cross-sectional view showing the structure of the waterproof sheet section of FIG.

6 is a partial perspective view showing a state of the drain material of FIG.

FIG. 7 is an enlarged vertical cross-sectional view showing the state of the inspection corridor of the present embodiment.

FIG. 8 is a cross-sectional view showing a state of the water blocking sheet section in the present embodiment when water is leaking.

9 is a cross-sectional view showing a state of repairing the water-blocking sheet section from the state of FIG.

FIG. 10 is a schematic diagram showing a state in which the inspection corridor is used for storing water in an emergency in the present embodiment.

FIG. 11 is a characteristic diagram showing an example of gel time of the water blocking material according to the present embodiment.

12 (1) and 12 (2) are explanatory views showing a conventional leak detection method for detecting a leak detection state by switching electrodes.

[Explanation of symbols]

 10 Waste final disposal site 14 Bottom surface 16a, 16b Slope 18 Water-impervious construction part 22 Audit corridor 24 First water-impermeable sheet 24a Water-impermeable sheet compartment 26 Second water-impermeable sheet 32, 34 Seat body 36, 38 Cushion Material 40 Drain material 42 Water collection / injection pipe 44 Air vent pipe 46 Communication part 64 Water pressure gauge 70 Damaged part 72 Water stop material

Claims (14)

[Claims] 1. An inspection corridor disposed in a water-impervious construction section, and a surface of the water-impervious construction section, which is laid in a direction away from the inspection corridor around the inspection corridor position, A plurality of water-blocking sheet sections covering the surface of the water-impervious construction section, each of the water-blocking sheet sections is formed so as to hermetically seal the peripheral portions of two sheet bodies, and the inside of the water-blocking sheet section is in an independent communication state. A water-impervious structure characterized in that it is connected to the inside of the inspection corridor via a water collection / injection pipe on the corridor side. 2. The water-impervious structure according to claim 1, wherein the inspection gallery is embedded in the water-impervious construction portion and an upper surface portion is covered with the water-impervious sheet section. 3. The water impervious construction part according to claim 1 or 2, comprising a bottom surface and a slope, and the inspection gallery is arranged in a central portion of a bottom surface of the water impervious construction part in a longitudinal direction. Each of the impermeable sheet sections is arranged over at least a part of the slope from the bottom surface of the impermeable construction portion, and is connected so as to form an independent block in the axial direction of the inspection corridor. Characteristic water-blocking structure. 4. The water-impervious structure according to claim 3, wherein the water-impervious construction portion has a slope in which the bottom surface inclines downward from the slope position to the inspection corridor position. 5. The pressure-resistant drain material for forming a communicating portion between the two sheet bodies, and the drain material on both sides of each of the water-blocking sheet compartments according to claim 1. A water-impervious structure comprising a pair of cushioning materials sandwiched between the two sheet bodies, the drainage material being connected to the water collecting / injecting pipe. 6. The water blocking structure according to claim 1, wherein a water pressure gauge is provided in the water collecting / injecting pipe in the inspection corridor. 7. The water shield structure according to claim 1, wherein an air vent pipe is provided in the water shield sheet compartment, and the air vent pipe is connected to the inspection corridor. . 8. A pair of water-impervious sheet members arranged face-to-face and hermetically sealed, a pair of cushion members arranged face-to-face between the pair of sheet members, and sandwiched between the pair of cushion members. And a pressure-resistant drain material for forming a communication part between the sheet bodies, and a water collecting / injecting pipe having one end exposed from one end side of the sheet body and connected to the drain material. A water-impermeable sheet having a plurality of water-impermeable sheet compartments, one end of which is exposed from one end side of the sheet body, and the air vent pipe is disposed over substantially the entire length between the pair of sheet bodies. . 9. An inspection corridor disposed in a water-impervious construction section and 2
The inside of the sheet body is hermetically sealed so that the inside is in an independent communication state, and the inside is communicated with the inspection corridor through a water collection / injection pipe, and the inspection corridor is arranged on the surface of the water-shielded construction part A water leakage detection method for a water-impervious structure comprising a plurality of water-impervious sheet sections, wherein the damage is caused when the sheet body of any of the water-impermeable sheet sections is damaged. The leachate between the sheet body from the section, the leachate guided between the sheet body is moved between the sheet bodies by the inclination of the water-impervious construction portion,
Guided to the injection pipe side, the leachate guided to the water collection / injection pipe side is guided to the inside of the inspection corridor via the water collection / injection pipe, and the leachate guided to the inspection corridor A method for detecting water leakage in a water-impervious structure, which comprises detecting water leakage in the water-impervious sheet section that has been damaged. 10. The water leak meter of claim 9, wherein a water pressure gauge is installed in the water collection / injection pipe in the inspection corridor, and the leachate in the water-blocking sheet section guided to the inspection corridor by the water collection / injection pipe. By the water pressure acting on the water pressure gauge,
A method of detecting water leakage in an impermeable structure, which comprises detecting water leakage. 11. After confirming the water leakage by the water leakage detecting method of the water-impervious structure according to claim 9 or 10, the waterproofing material injection device is carried into the inspection corridor, and the water-impervious material is leaked. It is connected to the water collecting / injecting pipe of the water sheet compartment, and the water blocking material is injected into the water blocking sheet compartment through the water collecting / injecting pipe by the water blocking material injecting device. A method for repairing a leaked part, which comprises stopping water by filling a water sheet compartment and solidifying it. 12. The air vent pipe according to claim 11, wherein an air vent pipe is disposed in the water shield sheet compartment, the air vent pipe is connected to the inspection gallery, and the water collecting / injecting pipe enters the water shield sheet compartment. A method for repairing a water leakage part, characterized in that, when injecting a water blocking material, the water blocking material is injected while bleeding air in the water blocking sheet section from the air vent pipe. 13. The method for repairing a leaked part according to claim 11, wherein the water blocking material has a gel time sufficient to fill the water blocking sheet compartment. 14. The injection amount of the water blocking material according to any one of claims 11 to 13, wherein a sufficient amount of solidified water blocking material can be formed around an outer side of a damaged portion of the water blocking sheet section. Method for repairing leaked part.