JP3537383B2 - Impermeable sheet and its laying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seepage control sheet laid at a waste disposal site and a method of laying the sheet.

[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. As this impervious work, reliability, safety,
From the viewpoints of workability, economy, etc., a method of laying a soft synthetic resin-based water-impermeable sheet or a rubber-based water-impermeable sheet has been adopted. That is, such a soft material water-blocking sheet has characteristics that it has excellent water-blocking properties compared to other materials because it hardly permeates water, and is easy to lay and excellent in economical efficiency. It is.

On the other hand, in recent years, the above soft waterproof sheet laid at a waste disposal site is damaged by the impact or load of the discarded waste, and sewage flows out to pollute the surrounding environment. There is a problem. As a countermeasure against such a problem, two layers of the impermeable sheet are provided, and even if the first impermeable sheet is torn, the other impermeable sheets prevent leakage of sewage and enhance safety. A way is being considered.

[0004]

However, the above-described conventional two-layer structure of the water-impervious sheet has a structure in which two sheets of the water-impervious sheet are simply stacked, and the safety factor is increased by doubling the strength. It is impossible to identify the damaged part of the sheet that occurred after landfill of waste, and it was not possible to repair the damaged part,
If both layers are damaged, there is a risk of leakage of sewage as described above.

[0005] Therefore, in order to solve the above-mentioned problems, the present invention can easily identify a damaged portion, and can easily prevent leakage of sewage from the identified damaged portion. It is an object of the present invention to provide a water-impervious sheet that is excellent in safety and reliability when used in a material disposal site, and a laying method capable of easily laying and constructing the water-impervious sheet.

[0006]

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The impermeable sheet 1 of the present invention has a joining band formed in a cross-sectional shape by an upper horizontal piece 6, a lower horizontal piece 7, and a vertical piece 8 connecting these horizontal pieces 6,7. Each of the edges of the lower rectangular sheet 13 is welded and joined to the plurality of rectangular sections A formed by being connected in a lattice shape to the lower horizontal piece 7 of each of the joining bands constituting the four sides of the rectangular section A. And the upper horizontal side 6
Each edge of the upper rectangular sheet 11 is welded and joined to form a sheet upper surface, each of the rectangular sections A is formed in a bag shape, and the lower rectangular sheet 13 for each of the rectangular sections A is formed.
An intermediate drainage member 15 is interposed in a bag-like space between the upper rectangular sheet 11 and the upper rectangular sheet 11.

[0007] The joining zone forming the rectangular section A includes a straight joining zone 3 forming four sides and an L-shaped, T-shaped joining section connecting the straight joining zones 3 to form a corner portion. It is preferable that it is composed of a cross-shaped corner joining band 5 (5a, 5b, 5c).

[0008] Further, the impermeable sheet 1 of the present invention comprises an upper horizontal piece 6, a lower horizontal piece 7, and these horizontal pieces 6,7.
And a plurality of long joining bands 4a formed in the shape of a cross section with the vertical piece portion 8 connecting the plurality of long joining bands 4a at predetermined intervals in parallel with each other, and between the long joining bands 4a. Short joining bands 4b formed in the same shape as the cross section 4a are arranged so as to be laid at predetermined intervals and welded to each other,
A plurality of rectangular sections A are formed by the long and short joining bands 4a and 4b, and a plurality of rectangular sections A along the long joining bands 4a.
Is covered with a long lower sheet 14 formed in the shape of a strip having the same width as the predetermined interval, and is welded to the lower horizontal piece 7 of each of the bonding strips 4a and 4b constituting the rectangular section A. And the upper surface side of the plurality of rectangular sections A along the long joining band 4a is covered with the long upper sheet 12 formed in a band shape having the same width as the predetermined interval. The upper surface of the sheet is formed by welding and joining with the upper horizontal piece 6 of each of the joining bands 4a and 4b constituting the rectangular section A, each of the rectangular sections A is formed in a bag shape, and each of the rectangular sections A is formed. An intermediate drainage member 15 is provided in each of the bag-shaped space portions between the lower rectangular sheet 14 and the upper rectangular sheet 12.

Each of the rectangular sections A formed in the bag shape
Is provided with an upper communication port 17 which penetrates a part of the upper sheets 11 and 12 and is connected to a first pressure hose 18, and a second pressure hose 20 which penetrates a part of the lower sheets 13 and 14. May be provided with a lower communication port 19 that is connected to the lower communication port 19.

In the method for laying a water-impervious sheet according to the present invention, a nonwoven fabric 23 is laid so as to cover a bottom 31 of a waste disposal site, and an upper horizontal piece 6 and a lower horizontal piece 7 and the vertical pieces 8 connecting the horizontal pieces 6 and 7 to each other, the joining strips 3 and 5 formed in the shape of a cross section are arranged, and the joining strips 3 and 5 are welded and joined in a lattice shape. A plurality of rectangular sections A are formed by coupling, a lower rectangular sheet 13 is arranged in each rectangular section A, and a lower rectangular sheet 7 is attached to a lower horizontal piece 7 of each of the joining bands 3 and 5 constituting four sides in each rectangular section A. 13 are welded to each other, an intermediate drainage member 15 is laid on the upper surface of the lower rectangular sheet 13 in each rectangular section A, and the upper rectangular sheet 1 is placed on the upper surface of each intermediate drainage member 15.
1 and each of the above-mentioned bonding zones 3, 5
Of the upper rectangular sheet 11 are welded to each other to form each of the rectangular sections A in a bag shape, and the non-woven fabric 22 is covered so as to cover each of the upper rectangular sheets 11.
It is characterized by laying.

Further, according to the method of laying the impermeable sheet of the present invention, the nonwoven fabric 23 is laid so as to cover the bottom surface 31 of the waste disposal site, and the upper horizontal piece 6 and the lower horizontal piece 7 and a vertical piece 8 connecting the horizontal pieces 6 and 7 are arranged in such a manner that long joining bands 4a formed in the shape of a cross section are parallel to each other at a predetermined interval, and each long joining is performed. A long strip-shaped lower sheet 14 having the same width as the predetermined interval is arranged between the strips 4a, and both side edges of the lower sheet 14 and the lower horizontal piece 7 of the long joint strip 4a are welded and joined, Between the long joining bands 4a, short joining bands 4b formed in the same shape as the long joining band 4a and having a cross-sectional shape are arranged so as to extend at predetermined intervals, and the short joining bands are arranged. 4b, the lower horizontal piece 7 and the lower sheet 14 are welded and joined together. Wherein the edge of Jikahen portion 8 long bonding zones 4
a, and welded to the vertical piece portion of each
a, 4b, a plurality of rectangular sections A are formed, and an intermediate drainage material 15 is laid on the upper surface of the lower sheet 14 in each of the rectangular sections A, respectively. Put the upper sheet 12 along the long joining band 4a,
Placed on the upper surface of each intermediate drainage material 15 and laid respectively,
The upper horizontal side portion 6 of each of the joining bands 4a and 4b is welded and joined to each side edge and halfway portion of the upper sheet 12, and each of the rectangular sections A is formed into a bag shape.
2 is covered with a nonwoven fabric 22.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water-impervious sheet of the present invention and a method of laying the same will be described in detail for each embodiment with reference to the drawings.

A first embodiment of a water impermeable sheet 1 is composed of a bonding zone, a pair of upper and lower sheets, and an intermediate drainage material. In the present embodiment, the joining band is composed of the straight joining portion 3 and the corner joining band 5, and the upper horizontal piece 6, the lower horizontal piece 7, and the vertical piece 8 respectively.
It is composed of

The upper horizontal piece 6 and the lower horizontal piece 7 of the straight joint 3 are long strip-shaped members each having a predetermined width, for example, 600 mm and a length of about 20 m. is there. The vertical piece 8 is formed to have a predetermined width, for example, about 200 mm, and the longitudinal direction is formed to be about 20 m, which is equivalent to the upper and lower horizontal pieces 6, 7. And
With the upper and lower edges of the vertical piece 8 as joining margins, as shown in FIG. 2, the vertical piece 8 is bent into, for example, a substantially Z-shape to form an upper horizontal piece 6 and a lower horizontal piece 7. Weld joint. As for the mounting position on each of the upper and lower horizontal pieces 6, 7, they are joined so as to be located at the center in the width direction, and as shown in FIG.

As shown in FIG. 4, the corner joint band 5 is composed of an L-shaped joint band 5a, a T-shaped joint band 5b, and a cross-shaped joint band 5c. , T-shaped, and cross-shaped, the width of each is the same as that of the above-mentioned straight joint 3, and the vertical piece is also formed in the same manner.

Each of the joining bands 3 and 5 has a thickness of 1.5 mm.
, For example, a polyethylene-based resin such as metallocene-catalyzed polyethylene.

In the present embodiment, the pair of upper and lower sheets 11 and 13 is a substantially square rectangular shape having a length of about 20 m and a length of about 20 m, and is a synthetic resin sheet having a thickness of 1.5 mm, for example, metallocene. It is made of polyethylene resin such as catalyst polyethylene. The upper rectangular sheet 11 and the lower rectangular sheet 13 are formed by welding and joining a strip-shaped sheet material having a length of 20 m and a width of 2.57 m or 5.1 m in the width direction to form a rectangular sheet having a side of 20 m. Is done.

The intermediate drainage material 15 is made of a material having cushioning properties and water permeability, such as a nonwoven fabric, or a porous material. In the present embodiment, a non-woven fabric having a thickness of about 10 mm and a material formed in a strip shape having a length of 20 m and a width of 2 m, which is welded in the width direction and formed to a width of about 20 m is used. .

Then, as shown in FIG. 6, the straight joining zone 3 and the corner joining zone 5 are connected in a lattice shape, and a plurality of rectangular sections, in this embodiment, sections A each having a side of 20 m. Are formed side by side vertically and horizontally, and an upper rectangular sheet 1 is formed on the front and back surfaces of each section A.
1 and the lower rectangular sheet 13 are respectively welded and joined to the upper and lower horizontal pieces 6, 7 of the joining bands 3, 5, and each of the rectangular sections A is substantially sealed, 20 m in length, 20 m in width, and 200 m in thickness.
m, and is formed into a bag shape having a substantially plate-like space, and an intermediate drainage material 15 is interposed in the bag shape as shown in FIG.

The straight joint 3 and each corner joint band 5 are connected to each other by upper horizontal pieces 6, lower horizontal pieces 7, and vertical pieces 8.
These are welded and connected. In addition, each joining zone 3,5
In the case of the lower rectangular sheet 13, the four sides of this sheet are welded and joined to the lower horizontal pieces 7 of the joining strips 3 and 5 constituting the rectangular section. In the case of 11, the four sides of this sheet are welded and joined to the upper horizontal pieces 6 of the joining strips 3 and 5 constituting the rectangular section. In addition, connection of each joining zone 3,5, and joining zone 3,
When the welding range is wide, a self-propelled welding machine or the like is used to join the upper and lower rectangular sheets 11 and 13 to each other, and a portion where the self-propelled welding machine cannot be used, for example, a corner joint band The corners in the above are joined to each other by using a manual welding machine. The joint B is formed by double welding as shown in FIG. 3A or single welding as shown in FIG. 3B.

Further, in the water impermeable sheet 1 of the present embodiment,
The upper rectangular sheet 11 and the lower rectangular sheet 13 constituting the water-blocking sheet 1 are provided with communication ports 17 and 19, respectively. The communication ports 17 and 19 are connected to the upper and lower sheets 11 and
13, and is preferably disposed at a diagonal position where the upper and lower sheets 11 and 13 do not face each other. These communication ports 17, 19 are
As shown in FIG. 5, a substantially rectangular flange-shaped connection piece 21 is provided at the base end, and a circular or substantially rectangular connection hole portion drilled in the sheets 17 and 19 has a seat back surface, that is,
When the respective sheets 17 and 19 are joined to the joining bands 3 and 5, they are welded and joined from surfaces facing each other on the inner surface side. Then, pressure-resistant hoses 18, 20 are connected to the communication ports 17, 19.

As shown in FIG. 1 and FIG.
The pressure-resistant hoses 18 and 20 each having a diameter of about 10 to 20 mm are provided to extend from the upper surface and the lower surface, respectively.
8 and 20 are provided in all of the rectangular sections A constituting the impermeable sheet 1. The pressure-resistant hose serving as the first pressure-resistant hose connected to the upper surface of the water-impervious sheet 1 is an air vent pipe 18 used for air release, and a second pressure-resistant hose connected to the lower surface of the water-impervious sheet 1. The pressure-resistant hose as the pressure-resistant hose is the water collecting pipe 20.

Next, a method of laying the impermeable sheet 1 having the above-described configuration will be described. The waste disposal site on which the impermeable sheet 1 is laid is formed by excavating a vast site in, for example, a mountainous area, as shown in FIG. 7, and the impermeable sheet 1 is laid on the bottom surface 31 of the recess. Is done.

First, the site excavated and formed in a concave shape, which is to be laid, is checked for any factors such as protrusions such as stones and uneven settlement of the ground. It is checked whether there is rainwater or the like, and whether there is a cause of breakage of the impermeable sheet 1 to be laid or a factor that causes deterioration of quality maintenance of the impermeable sheet 1.

Next, a base material 23 made of a nonwoven fabric is spread over the entire base surface 31, which is a concave bottom surface, so that the base is not exposed. The base material 23 is formed into a single base material by bonding a nonwoven fabric, which is a material formed in a belt shape having a predetermined width and a predetermined length, in the width direction and the length direction. In addition, the overlap margin of the joining portion should be 50 mm or more, and the joining should also be 50 mm or more. For the joining, heat welding is performed with a gas burner or a manual welding machine, and work must be performed while pressing with a roller etc. at the time of heat welding. I do. After the completion of the laying, the base material 23 is visually inspected and checked for defects or peeling.

Next, a rectangular section A is formed on the surface of the base material 23 as shown in FIG. To form a parcel,
As shown in FIG. 6, an L-shaped corner joint band 5a is used at the four corners, a T-shaped corner joint band 5b is used at the periphery, and a cross-shaped corner is used at each intersection. Part joint zone 5
Using c, a rectangular section A having a side of about 20 m is formed using each of the directly joined portions 3. Each bonding zone 3,
5a, 5b, and 5c are formed by welding and joining the upper horizontal pieces 6, the lower horizontal pieces 7, and the vertical pieces 8 to each other to form a frame-shaped structure having a cross-sectionally shaped shape in a lattice shape. Rectangular section A
Are configured.

Next, as shown in FIG. 8B, a lower rectangular sheet 13 is arranged and laid in each rectangular section A. A communication port 19 to which a water collection pipe 20, which is a pressure-resistant hose previously connected and formed in a factory or the like, is connected to a predetermined position on the lower rectangular sheet 13 arranged. The attachment is bonding by heat welding, and the water collecting pipe 20 extends under the lower rectangular sheet 13 and extends to the outside.

Next, the lower rectangular sheet 13 is welded to the lower horizontal side portions 7 of the joining bands 3 and 5 surrounding the lower rectangular sheet 13 and the four sides. For joining, as shown in FIG. 3, the edge of the lower rectangular sheet 13 is overlapped on the upper surface of the lower horizontal side portion 7, and a self-propelled double welding machine is used. In addition, about a corner part which cannot use this self-propelled double welding machine, joining is performed using a manual welding machine. At the time of this joining operation, the upper horizontal side 6 of each of the joining bands 3 and 5 is turned up and the lower horizontal side 7 is exposed.

Next, the lower rectangular sheet 13 in the rectangular section A
As shown in FIG. 8D, an intermediate drainage member 15 is arranged on the upper surface of the. This intermediate drainage material 15 is made of a substantially band-shaped nonwoven fabric,
Bonding is performed in the width direction, and preferably, bonding is performed by heat welding using a gas burner or the like, while confirming that the overlap margin is 50 mm or more, and arranged.

Next, the upper rectangular sheet 11 is arranged and laid on the upper surface of the intermediate drainage member 15. As shown in FIG. 1, the upper rectangular sheet 11 is provided with a communication port 1 to which an air vent pipe 18 connected in advance at a factory or the like is connected.
7 is attached to a predetermined position. The attachment is joining by heat welding.

Next, as shown in FIG. 8 (e), the upper horizontal sides 6 of the joining bands 3 and 5 located around the upper rectangular sheet 11 and the four sides of the upper rectangular sheet 11 are separated. Weld joint. In this joining, the edge of the upper rectangular sheet 11 is overlapped on the upper surface of the upper horizontal side portion 6, and a self-propelled double welding machine is used similarly to the lower rectangular sheet 13. In addition, about a corner part which cannot use this self-propelled double welding machine, joining is performed using a manual welding machine. Thereby, the rectangular section A is formed in a bag shape.

The procedure of arranging and joining the lower rectangular sheet 13, the intermediate drainage material 15, and the upper rectangular sheet 11 for each rectangular section A may be adopted.
May be performed at the same time to perform arrangement joining.

Then, the lower rectangular sheet 13, the intermediate drainage material 15, and the upper rectangular sheet 11 are arranged and joined to all the rectangular sections A, whereby the impermeable sheet 1 is completed.

Next, a negative pressure test is performed for each rectangular section A.
This negative pressure test is an inspection for scratches or damage on the front and back surfaces of the water-impervious sheet 1 and poor joining at the welded joint.

First, the vacuum pump P is connected to the water collecting pipe 20 connected to the communication port 19 located on the lower surface side of the seat. Further, the valve 24 of the air vent pipe 18 connected to the communication port 17 on the upper surface side of the seat is closed.

Next, the vacuum pump P is operated to reduce the pressure in the rectangular section A to 5 cmHg or less. Then, it is confirmed that the reduced pressure state is maintained.

Next, the reduced pressure state of 5 cmHg or less is maintained for 2 minutes. If it is confirmed that the reduced pressure state is maintained and the pressure does not decrease to the atmospheric pressure, the result is judged as pass, and the negative pressure test of the other rectangular section A is sequentially performed.

For the rectangular section A that did not pass the negative pressure test, the front and back surfaces of the water-blocking sheet 1 and the welded joints of each part were re-examined, defective portions were repaired, and the negative pressure test was performed again. , Check.

After completion of the negative pressure test, a surface material 22 made of a nonwoven fabric is laid on the upper surface of the water-impermeable sheet 1 as shown in FIG. This surface material 2
Reference numeral 2 is the same as the base member 23 described above, and a nonwoven fabric, which is a material having a predetermined width and a predetermined length, is joined in the width direction and the length direction to form one surface layer material.

Thereafter, the soil is covered with protective sand to complete the process.

After the installation of the impermeable sheet 1, the inspection of each rectangular section A as described above and the early repair can be performed even during the reclamation work of the waste.
Further, if each rectangular section A is decompressed and brought into a vacuum state, the upper surface (11) of the sheet and the lower surface (13) of the sheet are integrated, and it is possible to prevent the sheet from being swirled by strong wind or the like.

At the waste disposal site, during the landfill work of the waste or after the completion of the landfill, the impermeable sheet 1
Even if leakage of sewage occurs due to breakage of the device, the damaged portion can be easily specified, and the damaged portion can be easily repaired. That is, by making each of the rectangular sections A have a structure in which each of the rectangular sections A is vacuum-sucked by the vacuum pump P via the water collecting pipe 20, when the impermeable sheet 1 is damaged and sewage leaks from any of the rectangular sections A, The leaked water is sucked, whereby the damaged rectangular section A can be easily identified. Further, by continuing the vacuum suction even after detecting the damage, it is possible to suck up the sewage leaking from the damaged portion and to prevent the sewage from flowing out.

During or after landfilling of the waste, the water impermeable sheet 1 is damaged as described above. To repair the damaged portion, the valve of the air vent pipe 18 is opened and opened. As shown in FIG. 10, the injection pipe 25 is connected to the water collecting pipe 20.

From the injection pipe 25, a solidifying agent is fed,
The injection is performed into the rectangular section A. This solidifying agent is a fluid made of a urethane resin or a highly absorbent resin having strong elasticity after solidification, or a solidifying synthetic resin such as an epoxy resin or a polyester resin, and is injected into the rectangular section A at a predetermined pressure. Done. The solidifying agent M to be injected has a rectangular section A
11 is filled in the upper rectangular sheet 11 and the lower rectangular sheet 13 and absorbed by the intermediate drainage material 15, and
As shown in (1), the sheet is leached from the damaged portion of the sheet, and the periphery of the damaged portion is solidified. The completion of the injection of the solidifying agent M is confirmed by overflow from the air vent pipe 18, and the injection is stopped upon completion of this.

Therefore, according to the above-described waterproof sheet 1, the structure of the waterproof sheet 1 has two layers, upper and lower, and is divided into predetermined sections.
Even if damage occurs, the damaged portion does not spread, and since a pressure-resistant hose such as a water collecting pipe is connected to each section, the damaged portion can be easily specified. Then, a solidifying agent can be injected into the damaged section by using the injection pipe 25 to repair the damaged portion, and leakage of sewage from the damaged portion can be prevented. In addition, a negative pressure test or the like can be performed while forming each section at the time of laying, so that initial failure as the water impermeable sheet 1 can be prevented, and reliability can be ensured.

Second Embodiment Next, a water-impervious sheet 1 and a method of laying the same according to a second embodiment of the present invention will be described. In the second embodiment, the same or similar parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The water impermeable sheet 1 according to the second embodiment is
As in the first embodiment described above, it is composed of a joining band, a pair of upper and lower sheets, and an intermediate drainage material. In the second embodiment, as a configuration different from that of the first embodiment, an L-shaped, T-shaped, or cross-shaped corner joint band 5 (5a, 5a) is used.
b, 5c), a long and straight band-shaped joint band similar to the joint bands 3 and 5 of the first embodiment is formed as a joint band constituting the impermeable sheet 1. Bonding band 4a
And a short, straight band-shaped joining band 4b. Further, the upper and lower sheets are not formed in the substantially square rectangular shape of the first embodiment, but are constituted by upper and lower sheets 12 and 14 which are elongated in a band shape.

That is, in the water-impervious sheet of the second embodiment, as shown in FIG. 14, the long joining bands 4a are arranged in parallel with each other at a predetermined interval, for example, every 20 m. The short joining strips 4b are arranged between the strips 4a at predetermined intervals, for example, every 20 m, and the upper horizontal pieces 6, the lower horizontal pieces 7, and the vertical pieces 8 are welded to each other. A plurality of rectangular sections A are formed, and are formed along the long joining bands 4a in each of the rectangular sections A to have an interval width of the long joining bands 4a, that is, a long section having a width of 20 m. The upper sheet 12 and the lower sheet 14 are welded and joined to form each rectangular section A into a substantially closed bag shape, and the intermediate drainage material 15 is interposed in the bag-shaped space of these rectangular sections A. Things.

Next, a method of laying the impermeable sheet 1 according to the second embodiment will be described. First, a nonwoven fabric serving as a base material is laid so as to cover the bottom surface of the waste disposal site. next,
On the upper surface of the base material, long bonding strips 4a formed in advance in the shape of a cross section are arranged in parallel at intervals of 20 m.

Next, as shown in FIG. 12, a long strip-shaped lower sheet 14 having a width of 20 m is arranged between the long joining strips 4a. A communication port to which a water collection pipe formed of a pressure-resistant hose is connected is attached to the disposed lower sheet 14 at intervals of 20 m in the longitudinal direction (not shown).

Next, both lateral edges of the lower sheet 14 and the lower horizontal piece 7 of the long joining band 4a are welded and joined. This joining is performed by overlapping the side edge portion of the lower sheet 14 on the upper surface of the lower horizontal piece 7 and using a self-propelled double welding machine to form a long joining band 4a.
Are continuously formed along the line.

Next, as shown in FIG. 13, a short joining band 4b formed at the interval between the long joining bands 4a is arranged between the long joining bands 4a. Then, the lower horizontal piece 7 of the short joining band 4b is welded and joined to the upper surface of the lower sheet 14.

Next, the vertical edges of both ends of the short joining band 4b and the vertical pieces of the long joining band 4a are welded and joined, and the short joining bands 4b are sequentially arranged and welded and joined. A plurality of rectangular sections A each having a side length of 20 m are continuously formed along the long and short joining bands 4a at the long and short joining bands 4a and 4b. In addition, the short joining band 4b is arranged so that the above-mentioned communication port is arranged in each rectangular section A.

Next, the intermediate drainage members 15 are arranged and laid on the upper surface of the lower sheet 14 in each rectangular section A, respectively.

Next, a long strip-shaped upper sheet 12 having the same shape as the lower sheet 14 is arranged on the upper surface of each intermediate drainage member 15 along the longitudinal direction of the long joint strip 4a and laid down. . Like the lower sheet 14, a communication port to which a drain pipe made of pressure-resistant hose air is connected is attached to the upper sheet 12 at a predetermined position.

Next, as shown in FIG.
2 and the upper horizontal piece 6 of the long joining band 4a is welded and joined, and the upper horizontal piece 6 of the short joining band 4b every 20m and the middle part of the upper sheet 12 every 20m are sequentially welded and joined. I do. Thus, each rectangular section A is formed in a bag shape. Then, the short joining band 4b, the upper sheet 12, and the lower sheet 14 are arranged and joined to each of the long joining bands 4a arranged on the bottom surface of the waste disposal site, whereby the impermeable sheet 1 is completed.

Thereafter, a negative pressure test is performed for each rectangular section A in the same manner as in the first embodiment described above. Be inspected.

After completion of the negative pressure test, a surface layer made of a nonwoven fabric is laid on the upper surface of the water-impervious sheet 1 so as to cover the entire water-impervious sheet 1, and then soil is covered with protective sand to complete the operation.

In the water-impervious sheet 1 of the second embodiment, similarly to the above-described first embodiment, even after laying the water-impervious sheet 1 and during the reclamation work of the waste, It is possible to perform inspection and early repair of each rectangular section A as described above. If each rectangular section A is in a vacuum state, the upper surface of the sheet and the lower surface of the sheet are integrated, and it is possible to prevent the sheet from being fanned by strong wind or the like.

At the waste disposal site, during the landfill work of the waste or after the landfill is completed, the impermeable sheet 1
Even if leakage of sewage occurs due to breakage of the device, the damaged portion can be easily specified, and the damaged portion can be easily repaired. That is, each of the rectangular sections A has a structure in which each of the rectangular sections A is vacuum-sucked by a vacuum pump via a water collecting pipe. Is sucked, whereby the broken rectangular section A can be easily identified. Further, by continuing the vacuum suction even after detecting the damage, it is possible to suck up the sewage leaking from the damaged portion and to prevent the sewage from flowing out.

During or after the landfill of the waste, the water-blocking sheet 1 is damaged as described above. To repair the damaged portion, the valve of the air vent pipe is opened and opened, and the water collecting pipe is opened. Connect the injection tube to.

From the injection tube, a solidifying agent is fed and injected into the rectangular section A. This solidifying agent is a fluid made of a urethane resin or a highly absorbent resin having strong elasticity after solidification, or a solidifying synthetic resin such as an epoxy resin or a polyester resin, and is injected into the rectangular section A at a predetermined pressure. Done. The solidifying agent injected is filled in the upper rectangular sheet and the lower rectangular sheet in the rectangular section, absorbed by the intermediate drainage material, and leached out from the broken part of the sheet to solidify around the broken part. In addition, the completion of injection of the solidifying agent was confirmed by overflow from the air vent tube,
This is completed and the injection is stopped.

Therefore, according to the above-described waterproof sheet 1, the structure of the waterproof sheet 1 has two layers, upper and lower, and is divided into predetermined sections.
Even if damage occurs, the damaged portion is not diffused, and since the pressure-resistant hose is connected to each section, the damaged portion can be easily specified. Then, a solidifying agent can be injected into the damaged section by using a pressure-resistant hose to repair the damaged portion, thereby preventing leakage of sewage from the damaged portion. Also,
At the time of laying, a negative pressure test or the like can be performed while forming each section, so that initial failure as a water impermeable sheet can be prevented, and reliability can be ensured.

In each of the above-described embodiments, an example in which the inspection of the water-impervious sheet 1 itself and the failure of the joint after completion of the water-impervious sheet 1 is performed by a negative pressure test using a vacuum pump. As described above, a pressurization test for testing whether the pressurized state is maintained by connecting a compressor or the like and allowing compressed air to flow into each rectangular section A may be used.

[0065]

As described above, according to the water impermeable sheet according to the present invention, the structure of the water impermeable sheet has two layers, upper and lower, and is divided into rectangular sections. Even if damage occurs, the damaged portion is not diffused, and since the pressure-resistant hose is connected to each section, the damaged portion can be easily specified. The damaged rectangular section can be filled with a solidifying agent using a pressure-resistant hose to repair the damaged area, thereby preventing leakage of wastewater from the damaged area. The safety and reliability of the repository can be improved. In addition, since a negative pressure test or the like can be performed while forming each section at the time of laying, it is possible to prevent the occurrence of an initial failure as a water impermeable sheet and to ensure reliability.

Further, the structure of the joining band forming the rectangular section is composed of a straight joining band and L-shaped, T-shaped and cross-shaped corner joining bands used for each corner portion. Thereby, the rectangular section can be easily formed, and the workability can be improved even when the section is laid.

Further, according to the method for laying a water-impervious sheet of the present invention, a rectangular section is formed by using a long joint band formed in a cross-sectional shape, and the upper surface of the sheet and the sheet are formed. Since the lower surface is composed of an upper sheet and a lower sheet,
A bag-shaped section can be formed while reliably forming each rectangular section, and since this rectangular section is formed by welding and joining the edge portions of the upper and lower sheets to each joining band, structurally Is also a simple structure, that is, the molding structure at the time of laying is a lattice structure in which the rectangular sections are arranged vertically and horizontally, and the workability such as welding work is easy.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a water impermeable sheet according to the present invention.

FIG. 2 is a schematic perspective view of a bonding band constituting the impermeable sheet.

FIG. 3 is a cross-sectional view showing a joining portion between the joining band and a sheet.

FIG. 4 is a configuration diagram of a bonding band constituting the impermeable sheet.

FIG. 5 is a perspective view of a pressure-resistant hose provided on the impermeable sheet.

FIG. 6 is a plan view of a bonding band constituting the impermeable sheet.

FIG. 7 is a schematic sectional view of a waste disposal site using the impermeable sheet.

8 (a) to 8 (e) are explanatory diagrams showing a procedure for laying on the impermeable sheet.

FIG. 9 is an explanatory view of a negative pressure test of the impermeable sheet.

FIG. 10 is an explanatory view showing a repair procedure of the impermeable sheet.

FIG. 11 is a sectional view showing a repaired state of the impermeable sheet.

FIG. 12 is a perspective view showing a laying procedure of a second embodiment of the impermeable sheet according to the present invention.

FIG. 13 is a perspective view of the same.

FIG. 14 is a perspective view of the impermeable sheet.

[Explanation of symbols]

1 ... impermeable sheet 3… True joint 4a ... Long joining band 4b: short joining band 5 ... Corner joint zone 6 ... Top horizontal piece 7. Lower horizontal piece 8 Vertical part 11 Upper rectangular sheet 12 ... Upper sheet 13. Lower rectangular sheet 14 ... Lower sheet 15 Intermediate drainage material 17, 19 ... Communication port 18 1st pressure-resistant hose (air vent pipe) 20: Second pressure-resistant hose (water collecting pipe) 22 ... non-woven fabric (surface material) 23 ... non-woven fabric (substrate) A: Rectangular section

Continued on the front page (72) Inventor Keiichi Miyazaki 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Kozo Hagiya 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Hiroaki Hiraoka 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Susumu Mizuno 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Tsutomu Tanaka 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Shinichi Kanamaru 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Sakai Yukio 1-11-5 Kudankita, Chiyoda-ku, Tokyo Basic ground consultants Co., Ltd. (72) Inventor Shigeru Miki 1-11-5 Kudankita, Chiyoda-ku, Tokyo Basic ground consultants Co., Ltd. (56) References Special Kaihei 6-31261 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B09B 1/00

Claims (6)

(57) [Claims] 1. A plurality of connecting strips formed in a lattice shape by connecting an upper horizontal piece, a lower horizontal piece, and a vertical piece connecting these horizontal pieces in a lattice shape. In the rectangular section, the respective lower edges of the lower rectangular sheet are welded and joined to the lower horizontal pieces of the respective joining bands constituting the four sides in the rectangular section to form the sheet lower surface, and the upper horizontal side of the joining band is formed. Each edge of the upper rectangular sheet is welded and joined to form a sheet upper surface, and each of the rectangular sections is formed in a bag shape,
In addition, an intermediate drainage material is interposed in a bag-shaped space between the lower rectangular sheet and the upper rectangular sheet for each rectangular section. 2. A joining zone forming the rectangular section includes a straight joining zone forming four sides, and an L-shaped, T-shaped and cross-shaped joining the straight joining zone to form a corner portion. The water impermeable sheet according to claim 1, wherein the water impermeable sheet is constituted by a corner joint band. 3. A plurality of long joining strips formed in a cross-sectional man-like shape by an upper horizontal piece, a lower horizontal piece, and a vertical piece connecting these horizontal pieces at a predetermined interval. While being arranged, between the long joining bands, short joining bands formed to have the same shape as that of the long joining band are arranged so as to be laid at predetermined intervals and welded to each other. A long lower sheet in which a plurality of rectangular sections are formed by the long and short joining zones, and lower surfaces of the plurality of rectangular sections along the long joining zones are formed in a strip shape having the same width as the predetermined interval. At the same time, a lower surface of the sheet is formed by welding and joining with a lower horizontal piece portion of each joining band constituting the rectangular section, and the upper surface side of the plurality of rectangular sections along the long joining band is at the predetermined interval. The rectangular section is formed while covering with a long upper sheet formed in a band shape having the same width. The upper rectangular piece of each joining zone is welded and joined to form a sheet upper surface, each of the rectangular sections is formed in a bag shape, and the lower rectangular sheet and the upper rectangular sheet of each of the rectangular sections are formed. An impermeable sheet, wherein an intermediate drainage material is interposed in each of the bag-shaped space portions. 4. Each of the rectangular sections formed in the bag shape includes:
An upper communication port which penetrates a part of the upper sheet and is connected to the first pressure-resistant hose is provided, and a lower communication port which penetrates a part of the lower sheet and connected to the second pressure-resistant hose is provided. The water impermeable sheet according to claim 1, wherein the water impermeable sheet is provided. 5. A nonwoven fabric is laid so as to cover a bottom surface of a waste disposal site, and an upper horizontal piece, a lower horizontal piece, and a vertical piece connecting these horizontal pieces are cross-sectioned on the upper surface of the nonwoven fabric. Along with arranging the joint band formed in the shape of the character, the joint band is welded and joined in a lattice shape and connected to form a plurality of rectangular sections, a lower rectangular sheet is arranged in each rectangular section, and Each edge of the lower rectangular sheet is welded and joined to the lower horizontal piece of each of the joining zones constituting the four sides, and intermediate drainage materials are laid on the upper surface of the lower rectangular sheet in each of the rectangular sections, respectively. An upper rectangular sheet is laid on the upper surface of each of the above, and the upper horizontal sides of the respective joining bands and the respective edges of the upper rectangular sheet are welded and joined to form each of the rectangular sections into a bag shape, Laying non-woven fabric to cover upper rectangular sheet A method of laying a water-impervious sheet, characterized in that: 6. A nonwoven fabric is laid so as to cover a bottom surface of a waste disposal site, and a cross section of an upper horizontal piece, a lower horizontal piece, and a vertical piece connecting these horizontal pieces is formed on the upper surface of the nonwoven fabric. The long joining strips formed in the shape of the character are arranged so as to be parallel to each other at a predetermined interval, and a long strip-shaped lower sheet having the same width as the predetermined interval is arranged between the long joining strips. The both side edges of the lower sheet and the lower horizontal piece of the long joining band are welded and joined to each other, and between each of the long joining bands, a cross section of the same shape as the long joining band is formed. Along with arranging the short joining strips at predetermined intervals, the lower horizontal piece of the short joining strip is welded to the lower sheet, and the edge of the vertical piece of the short joining strip and the long edge are joined together. The vertical strips of the shank joint zone are welded and joined to form a plurality of rectangular sections in each of the long and short joining zones. An intermediate drainage material is laid on the upper surface of the lower sheet inside, and a long belt-shaped upper sheet having the same shape as the lower sheet is arranged along the long joining zone, and is disposed on the upper surface of each intermediate drainage material. Each is laid, and the upper horizontal side of each of the joining bands and each side edge and the middle of the upper sheet are welded and joined, so that each of the rectangular sections is formed into a bag shape, and covers each of the upper sheets. A method for laying a waterproof sheet, comprising laying a nonwoven fabric.