JP7646745B2 - Drainage pipe unit and installation method - Google Patents

Description

The present invention relates to a collection and drainage pipe unit used in waterproof structures at waste disposal sites and the like, and to an installation method for installing the collection and drainage pipe unit.

At waste disposal sites, waterproof sheets are laid at the boundary between the inside and outside of the storage area to prevent sewage and other leachate from leaking out of the storage area where the waste is stored. Leachate generated inside the storage area is transported to a leachate treatment facility through a collection pipe that runs through the waterproof sheet.

For example, the drainage structure of Patent Document 1 has a waterproof sheet disposed on the inner wall of the storage embankment, and leachate inside the storage embankment is drained to the outside via a tubular section that passes through the storage embankment and a collection and drainage pipe connected to the tubular section. The end of the tubular section is flush with the front wall facing the inside of the storage embankment, at approximately the same height as the bottom of the storage embankment. The end of the collection and drainage pipe is connected to the end of the tubular section that is flush with the front wall.

In addition, in Patent Document 2, a connecting pipe serving as a collection and drainage pipe protrudes from the back surface that constitutes the side surface, and the connecting pipe is spaced apart from the bottom surface.

JP 2004-321933 A JP 2016-175068 A

In Patent Document 1, the only way to connect the tubular section to the collection and drainage pipe is to butt the end of the tubular section and join it. Therefore, when waste is stored inside the storage embankment and a load is applied to the collection and drainage pipe, the butt joint between the end of the collection and drainage pipe and the end of the tubular section may become misaligned, causing a risk of water leakage. In addition, because the end of the tubular section is flush with the front wall, it is difficult to reinforce the butt joint with the end of the collection and drainage pipe by wrapping it in concrete.

In addition, in Patent Document 2, the connecting pipe protrudes from the back surface and is separated from the bottom surface, so there is a risk that the base of the connecting pipe may bend. If the base of the connecting pipe is bent due to the load applied to the connecting pipe, there is a risk that the joint between the base of the connecting pipe and the back surface may be damaged.

The drainage pipe unit for solving the above problems has the following features.
[Aspect 1] A waste collection and drainage pipe unit to be installed in a waste storage facility, comprising: a support member having a bottom plate to be placed at the installation bottom of an installation location within the storage facility and a back plate to be placed at the installation back of the installation location; and a collection and drainage pipe that penetrates the back plate from inside the storage facility to outside the facility and has at least a portion supported by the bottom plate, and the collection and drainage pipe is fixed to the back plate.

According to the above configuration, the collection and drainage pipe protrudes from the back plate toward the inside of the storage facility, making it easy to connect to other collection and drainage pipes. Furthermore, the collection and drainage pipe is in contact with at least a portion of the bottom plate, so that the collection and drainage pipe protruding toward the inside of the storage facility can be supported by the bottom plate. As a result, deflection of the base of the collection and drainage pipe relative to the support member can be suppressed, and the collection and drainage pipe fixed to the support member can be reliably connected to other collection and drainage pipes extending to the bottom portion of the storage facility.

[Aspect 2] The drainage pipe unit according to [Aspect 1], wherein the bottom plate and the back plate are joined by thermal welding.
According to the above configuration, leakage of seepage water from inside the facility to outside the facility can be suppressed at the corner portion between the bottom panel and the back panel.

[Aspect 3] The collection and drainage pipe unit according to [Aspect 1], wherein the collection and drainage pipe and the rear panel are joined by thermal welding.
According to the above configuration, leakage of seepage water from inside the facility to outside the facility can be suppressed at the corner portion between the collection and drainage pipe and the back panel.

[Embodiment 4] A collection and drainage pipe unit according to [Embodiment 1], in which at least a portion of the collection and drainage pipe is supported directly on the bottom plate or indirectly by another element.
According to the above configuration, by configuring at least a part of the collection and drainage pipe to be indirectly supported by another element, it is possible to increase the gap between the collection and drainage pipe and the bottom plate, which makes it possible to insert another pipe or the like between the collection and drainage pipe and the bottom plate.

[Aspect 5] The drainage pipe unit described in [Aspect 1] is provided with a reinforcing plate that reinforces the connection between the support member and the outer peripheral surface of the drainage pipe.
According to the above configuration, the joint between the support member and the drainage pipe can be reinforced.

[Aspect 6] The drainage pipe unit according to [Aspect 5], in which the reinforcing plate is an upper reinforcing plate that is joined by thermal welding to the upper portion of the outer periphery of the drainage pipe that protrudes from the back plate toward the inside of the field and to the inner surface of the back plate toward the inside of the field.

According to the above configuration, the upper reinforcing plate can prevent the welded portion between the collection and discharge pipe and the back plate from being damaged by the load on the collection and discharge pipe protruding toward the inside of the premises.
[Aspect 7] A drainage collection pipe unit as described in [Aspect 5] or [Aspect 6], in which the reinforcing plate is a side reinforcing plate and is joined by thermal welding to the side portion of the outer peripheral surface protruding from the back plate of the drainage collection pipe toward the inside of the field, the upper surface of the bottom plate on the inside of the field, and the inner surface of the back plate on the inside of the field.

According to the above configuration, the side reinforcement plate can prevent the welded parts between the bottom plate and the back plate and the welded parts between the collection and drainage pipes and the back plate from being damaged by the load on the support member or the collection and drainage pipes protruding to the inside of the facility.

[Aspect 8] The reinforcing plate is an outside reinforcing plate that is joined by thermal welding to the outer circumferential surface of the collection and discharge pipe that protrudes from the back plate of the collection and discharge pipe to the outside of the field and to the outer surface of the back plate on the outside of the field. The collection and discharge pipe unit according to any one of [Aspects 5] to [Aspect 7].

According to the above configuration, the outside-site reinforcement plate can suppress shaking of the portion of the drainage pipe protruding from the back plate to the outside of the site when concrete is poured outside the site.
[Aspect 9] A drainage pipe unit described in any one of [Aspect 1] to [Aspect 8], wherein the leg length of the welded portion provided on the inside of the corner portion formed by the bottom plate and the back plate is greater than or equal to the thickness of the back plate.

The peripheral edge of the support member is covered with a waterproof sheet, which is fused to the inner surface of the support member on the inside of the field. In this case, the welded part on the inside of the corner part formed by the bottom panel and the back panel has a large area by making the leg length equal to or greater than the thickness of the back panel. Therefore, the waterproof sheet can be placed along this part as well. In other words, the waterproof sheet can be placed without any gaps in the welded part.

[Aspect 10] A drainage pipe unit according to any one of [Aspects 1] to [Aspect 9], in which a gap may be formed between the lower portion of the outer periphery of the drainage pipe protruding from the back plate toward the inside of the facility and the upper surface of the bottom plate, and the gap is filled with a filler.

According to the above configuration, the lower portion of the outer periphery of the drainage pipe protruding from the back plate toward the inside of the facility can be supported by the filler, making the same portion less likely to bend toward the bottom plate.
[Aspect 11] A drainage pipe unit described in any one of [Aspect 1] to [Aspect 10], wherein at least one of the outer surfaces of the bottom plate facing the installation bottom and the outer surface of the back plate facing the installation back is provided with an anchor.

According to the above-described configuration, the anchors provided on at least one of the outer surfaces of the bottom panel and the rear panel bite into the installation location, thereby making the installation state strong.
[Aspect 12] An installation method for placing a collection and drainage pipe unit at an installation location of a storage facility for storing waste, the collection and drainage pipe unit comprising a support member having a bottom plate and a back plate, and a collection and drainage pipe that penetrates the back plate from inside the storage facility to outside the facility and has at least a portion supported by the bottom plate, the collection and drainage pipe being fixed to the back plate, the installation method comprising the steps of placing the bottom plate on an installation bottom that constitutes the installation location and placing the back plate on an installation back that constitutes the installation location, placing a waterproof sheet to cover the peripheral portion of the support member, and heat welding the waterproof sheet to the facility inside surface of the support member.

[Aspect 13] The bottom plate and the back plate are joined by thermal welding, and the length of the welded portion of the collection and drainage pipe unit provided on the inside of the corner portion formed by the bottom plate and the back plate is equal to or greater than the thickness of the back plate, and in the step of placing the waterproof sheet, the waterproof sheet is placed along the welded portion and thermally welded. [Aspect 12] Installation method.

[Aspect 14] The installation method according to [Aspect 12] or [Aspect 13] further includes a step of filling the gap with a filler if a gap is formed between the lower portion of the outer periphery of the drainage pipe protruding from the back plate toward the inside of the facility and the upper surface of the bottom plate.

The present invention makes it possible to easily perform installation work such as connecting to other collection and drainage pipes, while ensuring a reliable connection between the collection and drainage pipe fixed to the support member and other collection and drainage pipes extending to the bottom of the storage area.

FIG. 1 is a perspective view showing a closed system type disposal site in a first embodiment. FIG. 2 is a cross-sectional view showing an installation state of the drainage pipe unit in the first embodiment. FIG. 2 is a perspective view of the drainage pipe unit in the first embodiment, as seen from inside the storage area. FIG. 2 is a perspective view of the drainage pipe unit in the first embodiment, as viewed from outside the storage area. A cross-sectional view illustrating the leg length of the welded portion between the bottom plate and the back plate in the first embodiment, and the gap formed between the bottom plate and the collection and drainage pipe and the bottom plate. FIG. 2 is an exploded perspective view of the drainage pipe unit according to the first embodiment, as viewed from the inside of the facility. 5A to 5C are process diagrams illustrating a manufacturing process of the drainage pipe unit in the first embodiment. FIG. 4 is a process diagram illustrating an installation method for installing the drainage pipe unit in the first embodiment. FIG. 11 is a diagram illustrating a state in which a unit installation stand for installing a drainage pipe unit is installed at a position that will become the installation bottom in the first embodiment. FIG. 11 is a diagram illustrating a state in which reinforcing bars for installing a drainage pipe unit are installed at a position that will become the installation back portion in the first embodiment. FIG. 11 is a diagram illustrating a state in which a formwork for installing a drainage pipe unit is installed at a position that will become the installation back portion in the first embodiment. FIG. 2 is a diagram illustrating the state in which concrete is poured into a formwork installed at a position that will become the installation back portion in the first embodiment. FIG. 11 is a perspective view of the drainage pipe unit in the second embodiment, as seen from inside the storage area. FIG. 11 is a perspective view showing an open-type disposal site in the third embodiment. FIG. 11 is an oblique view of a drainage pipe unit installed on a slope of a storage area in the third embodiment, as viewed from the inside of the site. FIG. 11 is an oblique view of a drainage pipe unit installed on a slope of a storage area in the third embodiment, as viewed from outside the site. FIG. 13 is an oblique view of a drainage pipe unit installed on a slope of a storage area in a fourth embodiment, as viewed from the inside of the site. FIG. 11 is a cross-sectional view showing an installation state of a drainage pipe unit in a modified example of the first embodiment.

Hereinafter, a drainage pipe unit to which the present invention is applied will be described with reference to the drawings.
First Embodiment
[Closed system disposal site]
As shown in FIG. 1, a closed system type disposal site 1 is a final disposal site in which a storage site 2 for storing waste is covered with a covering facility 3 such as a roof. This makes it possible to suppress the generation of leachate 2a and prevent waste from scattering. For example, the storage site 2 is provided with a waterproof sheet 9 made of multiple types of sheets laminated on a soil waterproof layer, and a protective mat is laid to protect the waterproof sheet. A bottom collection and drainage pipe 5 for collecting and draining the leachate 2a is provided on the bottom surface 4 of the storage site 2. The bottom collection and drainage pipe 5 is a pipe with a high open area ratio with many through holes on the surface and excellent water absorption. Backfill materials such as gravel and filter materials are laid around the bottom collection and drainage pipe 5.

The storage field 2 is, for example, a landfill pit. The storage field 2 has a bottom surface 4 and a straight wall 6 that constitutes the side of a storage embankment erected around the bottom surface 4. The straight wall 6 is constructed, for example, by pouring concrete, fusing a waterproof sheet 9, and then laying a protective mat. A collection and drainage pipe unit 10 that is connected to the bottom surface collection and drainage pipe 5 is placed at the corner formed by the bottom surface 4 and the straight wall 6.

[Drainage pipe unit]
2 and 3 , the installation location of the drainage pipe unit 10 includes an installation bottom portion 7 configured on the bottom surface portion 4 and an installation back portion 8 configured on the straight wall 6. The drainage pipe unit 10 includes a support member 11 that is installed at the installation location, and a drainage pipe 14 that is fixed integrally with the support member 11.

[Support member]
The support member 11 has an L-shape as a whole. The support member 11 includes a bottom plate 12 and a back plate 13. The bottom plate 12 and the back plate 13 are molded bodies of a thermoplastic resin such as polyethylene, olefin, glass fiber reinforced plastic, or glass fiber reinforced polyethylene. The drainage pipe 14 is also molded bodies of a thermoplastic resin such as polyethylene, olefin, glass fiber reinforced plastic, or glass fiber reinforced polyethylene. The thickness of the bottom plate 12 and the back plate 13 is, for example, 30 mm or more.

The bottom panel 12 and the back panel 13 are, as an example, rectangular flat panels. The inclination of the back panel 13 relative to the bottom panel 12 corresponds to the inclination of the installation back part 8 relative to the installation bottom part 7 at the installation location. In this embodiment, the inclination of the installation back part 8 relative to the installation bottom part 7 is a right angle, so the angle of the back panel 13 relative to the bottom panel 12 is also a right angle.

As shown in FIG. 5, the bottom plate 12, one side, and the back plate 13 are joined by thermal welding. Specifically, an end face constituting one side of the back plate 13 is butted against the top surface of the bottom plate 12 at a position along one side. The outside of a corner portion 16b formed by one side of the bottom plate 12 and one side of the back plate 13 is joined by a groove weld 15. The groove here is, for example, V-shaped.

The inside of the corner 16b formed by one side of the bottom plate 12 on the inside of the field and one side of the back plate 13 is a welded portion where a decorative weld 16 is applied. The decorative weld 16 may be provided over the entire length of the corner 16b, but in this embodiment, it is provided to avoid the position corresponding to the collection and drainage pipe 14 (see Figure 6). When welding is performed over the entire length of the corner 16b, the strength can be increased together with the groove weld 15. The upper surface of the bottom plate 12 on the inside of the field and the inner surface of the back plate 13 on the inside of the field are the surfaces on which the waterproof sheet 9 is placed. Therefore, the decorative weld 16 forms a wide inclined surface 16a so that the waterproof sheet 9 can be placed along it, even at the corner 16b.

As an example, the decorative weld 16 is configured so that the leg length L is equal to or greater than the thickness T of the back plate 13. Preferably, the leg length L is greater than the thickness T of the back plate 13. In such a location, the leg length L is often smaller than the thickness T of the back plate 13, but in this embodiment, by making the leg length L equal to or greater than the thickness T of the back plate 13, the inclined surface 16a on the surface has a larger area. This makes it easier to position the waterproof sheet 9 so that it follows the inclined surface 16a.

As shown in FIG. 6, the back plate 13 has a through hole 17 for inserting the collection and drainage pipe 14. The through hole 17 is provided adjacent to one side of the back plate 13 that constitutes the corner portion 16b. Specifically, the through hole 17 is provided in the back plate 13 so that its lower end is spaced from the side of the back plate 13 that constitutes the corner portion 16b by the difference between the outer diameter of the pipe body 14a and the outer diameter of the inside end portion 14b. The collection and drainage pipe 14 has its pipe axis extending parallel to the bottom plate 12, i.e. perpendicular to the back plate 13.

The outer surface of the bottom plate 12 is the surface facing the installation bottom 7. An anchor sheet 26 for forming an anchor is heat-welded to the outer surface of the bottom plate 12. The anchor sheet 26 is also a molded body of a thermoplastic resin such as polyethylene, olefin, glass fiber reinforced plastic, or glass fiber reinforced polyethylene. The anchor sheet 26 includes a sheet base material 26a and a plurality of studs 26b molded on one side of the sheet base material 26a. Each of the plurality of studs 26b has a protruding shape and is provided in a scattered manner on one side of the sheet base material 26a. In addition, protruding stripes are provided parallel to each other on one side of the sheet base material 26a. In either case, each stud 26b has a bulging portion at the tip and a narrowed portion at the base portion below the tip. This allows the studs 26b to bite into the concrete being poured. The studs 26b may have a configuration in which two protrusions protrude in a V-shape from the sheet base material 26a.

The periphery of the sheet base material 26a of the anchor sheet 26 is heat welded to the outer surface of the bottom plate 12. The sheet base material 26a may be fixed to the outer surface of the bottom plate 12 with an adhesive or the like. The anchor sheet 26 may also be fixed by heat welding and adhesive. The anchor sheet 26 extends in the width direction of the outer surface of the bottom plate 12. Two anchor sheets are provided on the outer surface of the bottom plate 12. The position of the anchor sheet 26 is not particularly limited as long as the bottom plate 12 is firmly fixed to the installation bottom 7. In this embodiment, the anchor sheet 26 is, for example, disposed at a position on the outer surface of the bottom plate 12 that overlaps with the collection and drainage pipe 14 and at a position further forward that does not overlap with the collection and drainage pipe 14.

The anchor sheet 26 is also heat welded to the outer surface of the back panel 13 so that it extends in the width direction. The outer surface of the back panel 13 faces the installation back 8. In this embodiment, the anchor sheet 26 is provided in one place on the outer surface of the back panel 13.

The studs 26b of the anchor sheet 26 penetrate into the concrete that constitutes the installation bottom 7 and installation back 8, thereby increasing the bonding strength of the support member 11 to the installation bottom 7 and installation back 8.

The anchor sheet 26 provided on the outer surface of the bottom panel 12 may be provided so that the extending direction of the protruding studs 26b is the front-to-rear direction. The anchor sheet 26 provided on the outer surface of the back panel 13 may be provided so that the extending direction of the protruding studs 26b is the up-to-down direction. Even if the anchor sheet 26 is arranged in this way, the same effect can be obtained as when the protruding studs 26b extend in the width direction.

[Drainage pipe]
Here, the collection and drainage pipe 14 is a straight pipe and includes a pipe body 14a, an inside-site end 14b, and an outside-site end 14c. The inside-site end 14b is an example of a socket. Therefore, the inside-site end 14b as a socket has a larger outer diameter than the pipe body 14a. The inner diameter of the socket is also larger than the inner diameter of the pipe body 14a by the amount of the spigot inserted. The outside-site end 14c is an example of a spigot. The outside-site end 14c as a spigot has the same outer diameter as or slightly larger than the pipe body 14a. The inner diameter of the outside-site end 14c is the same as the inner diameter of the pipe body 14a. The collection and drainage pipe 14 is inserted into the through hole 17 with the outside-site end 14c as the insertion end so that the outside-site end 14c is located outside the field. The inside-site end 14b is located on the bottom plate 12.

For example, the inside end 14b protrudes 1 mm or more from the inner surface of the back plate 13. The outside end 14c also protrudes 1 mm or more from the outer surface of the back plate 13. The inner diameter of the pipe body 14a is, for example, 300 mm or more. The pipe body 14a is located at the position of the through hole 17. The tip position of the inside end 14b is a length that does not protrude beyond the tip of the bottom plate 12. This makes it possible to extend the waterproof sheet 9 to the tip portion of the bottom plate 12. In this embodiment, for example, the tip of the bottom plate 12 is located at a position 200 mm or more beyond the tip of the inside end 14b. Therefore, the tip of the inside end 14b does not protrude beyond the tip of the bottom plate 12.

Although not shown, the collection and drainage pipe 14 can also be fitted into the through hole 17 with the outside end 14c, which is configured with a spigot, as the insertion end, and the inside end 14b, which is configured with a receiving portion, positioned outside the field. In this case, the outside end 14c, which is configured as a spigot, is positioned on the bottom plate 12. If both ends of the collection and drainage pipe 14 are configured with spigots, one of the ends is used as the insertion end and fitted into the through hole 17. In this case, too, the spigot configured at one end is positioned on the bottom plate 12.

The width of the bottom plate 12 is large enough to accommodate the placement of the side reinforcing plates 23 on both sides of the tube body 14a. For example, the width of the bottom plate 12 and the back plate 13 is the outer diameter of the tube body 14a plus, for example, 200 mm, plus the thickness of the two side reinforcing plates 23. The height of the back plate 13 is the outer diameter of the tube body 14a plus 200 mm, plus the height of the upper reinforcing plate 22.

As shown in FIG. 4, the back panel 13 and the collection and drainage pipe 14 are joined by thermal welding 21 along the outer periphery of the collection and drainage pipe 14 on the outer surface of the back panel 13 on the outside of the field. The outer periphery of the inside end 14b of the field, which serves as a receiving portion that is part of the collection and drainage pipe 14, is supported by contacting the upper surface of the bottom panel 12. Note that on the inner surface of the back panel 13, the outer periphery of the collection and drainage pipe 14 and the periphery of the through hole 17 can also be cosmetically welded. The outer periphery of the inside end 14b of the field can also be cosmetically welded to the upper surface of the bottom panel 12.

As shown in FIG. 5, between the inside end 14b and the back plate 13, a gap 19 is provided between the lower part of the outer peripheral surface of the pipe body 14a and the upper surface of the bottom plate 12, the gap 19 having a height equivalent to the difference between the outer diameter of the pipe body 14a and the outer diameter of the inside end 14b. The gap 19 is defined by the end of the inside end 14b on the pipe body 14a side and the corner portion 16b. The gap 19 is filled with a filler 20 such as bead method polystyrene foam (EPS), sealing material, cement improved soil, liquefied treated soil, concrete, etc. As a result, the filler 20 supports the area between the end of the inside end 14b and the corner portion 16b in the pipe body 14a, making the same area of the pipe body 14a less likely to bend toward the bottom plate 12.

[Reinforcing plate]
As shown in Fig. 2, the fixation of the collection and drainage pipe 14 to the support member 11 is reinforced by a reinforcing plate. Specifically, as shown in Fig. 3, on the inner surface of the back plate 13, the back plate 13 and the collection and drainage pipe 14 are reinforced by an upper reinforcing plate 22. In addition, the collection and drainage pipe 14, the bottom plate 12 and the back plate 13 are reinforced by a side reinforcing plate 23. The upper reinforcing plate 22 and the side reinforcing plate 23 are field inside reinforcing plates arranged on the inside of the field. The upper reinforcing plate 22 and the side reinforcing plate 23 are also molded products made of the same material as the bottom plate 12, the back plate 13 and the collection and drainage pipe 14.

3 and 6, the upper reinforcing plate 22 has an outer diameter shape of a right-angled triangle. The upper reinforcing plate 22 is arranged so that the right angle portion is located at the corner formed by the upper part of the outer peripheral surface of the pipe body 14a and the inner surface of the back plate 13, so that the upper part of the outer peripheral surface and the inner surface of the back plate 13 are arranged without any gaps. The inner surface of the back plate 13 and the upper part of the outer peripheral surface of the pipe body 14a in the upper reinforcing plate 22 are joined by thermal welding 22b. The upper reinforcing plate 22 has holes 22a for engaging a hanging tool such as a hook. Such an upper reinforcing plate 22 prevents the pipe body 14a, the back plate 13, the thermal welding 21, etc. from being damaged by the load on the collection and drainage pipe 14 protruding inside the field. The outer diameter shape of the upper reinforcing plate 22 may be a right triangle or a square shape as long as it has a right angle portion.

The side reinforcing plate 23 is a plate material arranged on the side of the outer circumferential surface of the collection and drainage pipe 14, and has an overall rectangular shape. The side reinforcing plate 23 is arranged so as to stand on both the left and right sides of the pipe body 14a. The side reinforcing plate 23 is arranged so that the plate surface is parallel to the pipe axis of the collection and drainage pipe 14. The inner surface of the back plate 13, the upper surface of the bottom plate 12, and the outer circumferential surface side portion of the pipe body 14a in the side reinforcing plate 23 are joined by thermal welding 23b. The side reinforcing plate 23 has holes 23a for engaging a hanging tool such as a hook. Such a side reinforcing plate 23 suppresses damage caused by the load on the collection and drainage pipe 14 protruding outside the field, such as the groove welding 15 between the bottom plate 12 and the back plate 13 and the thermal welding 21 between the pipe body 14a and the back plate 13. Of course, the side reinforcing plate 23 is not limited to a rectangular shape, and may be, for example, a right-angled triangle, as long as it has a right-angled portion to align with the corner portion 16b and is large enough to contact the side portion of the outer circumferential surface of the pipe body 14a.

4 and 6, the collection and drainage pipe 14 and the back plate 13 are reinforced by the outside reinforcement plate 24 on the outer surface of the back plate 13. The outside reinforcement plate 24 is also a molded product of the same material as the bottom plate 12, the back plate 13, and the collection and drainage pipe 14. The outside reinforcement plate 24 has an outer diameter shape of a right-angled triangle. The outside reinforcement plate 24 is arranged so that the right angle portion is located at the corner formed by the upper part of the outer peripheral surface of the pipe body 14a and the outer surface of the back plate 13, so that it is arranged without gaps between the upper part of the outer peripheral surface and the outer surface of the back plate 13. As an example, the outside reinforcement plate 24 extends in the radial direction around the pipe axis of the collection and drainage pipe 14 and is arranged at equal intervals. The joining of the outside surface of the back plate 13 and the upper part of the outer peripheral surface of the pipe body 14a in the outside reinforcement plate 24 is joined by thermal welding 24a. Such an outside-site reinforcement plate 24 can prevent the part of the collection and drainage pipe 14 that protrudes from the back plate 13 to the outside of the site from shaking when pouring concrete to form the outside installation back 8.

The upper reinforcing plate 22 and the outer reinforcing plate 24 have the same configuration, and the number of parts is reduced by sharing parts. Of course, the upper reinforcing plate 22 and the outer reinforcing plate 24 may have different configurations.

[Production method]
Next, a manufacturing method for the drainage pipe unit 10 will be described with reference to FIG.
In the process of producing the drainage pipe unit 10, first, a back panel 13 having a through hole 17 is prepared (step 101). The back panel 13 is a molded product of a thermoplastic resin, and the through hole 17 may be provided by molding, or may be formed by a cutting device after molding.

Next, the bottom plate 12 is prepared, and then the bottom plate 12 and the back plate 13 are joined by thermal welding (step 102). Specifically, an end face constituting one side of the bottom plate 12 is butted against the upper surface of the bottom plate 12 at a position along one side. Here, a groove is provided on the outside of the corner portion formed by one side of the bottom plate 12 and the back plate 13. The bottom plate 12, one side, and one side of the back plate 13 are joined by groove welding 15. A decorative weld 16 is applied to the inside of the corner portion formed by one side of the bottom plate 12 and the back plate 13. Note that the decorative weld 16 can also be performed after the collection and drainage pipe unit 10 is installed at the installation site and before the waterproof sheet 9 is laid, for example, when the leg length is insufficient.

The collection and drainage pipe 14 is inserted into the through hole 17 of the back plate 13 (step 103). As an example, the collection and drainage pipe 14 is inserted into the through hole 17 with the outside end 14c as the insertion end so that the outside end 14c is located outside the field. On the outer surface of the back plate 13, the back plate 13 and the collection and drainage pipe 14 are joined along the outer circumferential surface of the collection and drainage pipe 14 by thermal welding 21. The lower part of the outer circumferential surface of the inside end 14b abuts on the bottom plate 12, and a gap 19 is formed between the upper surface of the bottom plate 12 and the lower part of the outer circumferential surface of the pipe body 14a, and between the end of the inside end 14b on the pipe body 14a side and the corner portion 16b.

Next, the support member 11 and the collection and drainage pipe 14 are reinforced with reinforcing plates (step 104). Specifically, an upper reinforcing plate 22 is placed at the corner between the upper part of the outer periphery of the pipe body 14a and the inner surface of the back plate 13, and then joined by thermal welding 22b. In addition, side reinforcing plates 23 are placed so as to stand on both the left and right sides of the pipe body 14a, and then joined by thermal welding 23b. Furthermore, an outside reinforcing plate 24 is placed at the corner between the side part of the outer periphery of the pipe body 14a and the outer surface of the back plate 13, and then joined by thermal welding 24a.

Anchor sheets 26 are heat-welded to the outer surface of the bottom plate 12 and the outer surface of the back plate 13. The timing at which the anchor sheets 26 are provided to the support member 11 may be before or after the bottom plate 12 and the back plate 13 are heat-welded (step 102), before or after the collection and drainage pipe 14 is inserted (step 103), or before or after the reinforcing plate is heat-welded (step 104).

The drainage pipe unit 10 manufactured as described above can be transported to a transport device by engaging the hooks of a hanging device such as a crane with the holes 22a and 23a. The drainage pipe unit 10 can also be transported from the transport device to the installation site by the hanging device.

[Installation method]
Next, a method for installing the drainage pipe unit 10 at an installation location will be described with reference to FIG.

The installation location of the drainage pipe unit 10 is the corner between the bottom surface 4 and the straight wall 6. Both the bottom surface 4 and the straight wall 6 that make up the storage area 2 are reinforced concrete (RC) structures, and are constructed by assembling reinforcing bars and pouring concrete into a formwork. As shown in FIG. 9, when pouring concrete, a unit installation stand 27 is installed at the position that will become the installation bottom 7, and the drainage pipe unit 10 is installed on the unit installation stand 27 (step 110). Then, as shown in FIG. 10, concrete is poured into the formwork to construct the bottom surface 4 and the installation bottom 7 (step 111). At this time, the surface of the installation bottom 7 and the top surface of the bottom plate 12 are made flush with each other.

Next, as shown in FIG. 10, the drainage pipe unit 10 is fixed to the steel bars 28 for constructing the straight wall 6 and the installation back portion 8 using reinforcing bars. Then, as shown in FIG. 11, formwork 29 for constructing the straight wall 6 is assembled. At this time, one formwork 29a for constructing the wall surface on the inside of the site is attached so as to fit along the inner surface of the back panel 13. Then, as shown in FIG. 12, concrete is poured into the formwork 29 to construct the straight wall 6 and the installation back portion 8, and the straight wall 6 and the installation back portion 8 are constructed (step 112). This makes the surface of the installation back portion 8 flush with the inner surface of the back panel 13.

Then, the outside end 14c of the collection and drainage pipe 14 is connected to an off-site collection and drainage pipe that is connected to a facility such as a leachate collection pit or a leachate treatment facility. As an example, the connection end of the off-site collection and drainage pipe and the outside end 14c of the collection and drainage pipe 14 are connected by EF fusion joints, rubber ring joints, welding, etc. Furthermore, the connection end of the bottom collection and drainage pipe 5 installed on the bottom part 4 is connected to the inside end 14b. As an example, the connection end of the inside end 14b and the connection end of the bottom collection and drainage pipe 5 are connected by EF fusion joints, rubber ring joints, welding, etc.

EF fusion joining is a joint that fuses the inner circumferential surface of the receptacle and the outer circumferential surface of the spigot by passing an electric current through a heated wire. Rubber ring joining is a joint that places a rubber gasket between the inner circumferential surface of the receptacle and the outer circumferential surface of the spigot. Welding is a joint that welds the tip of the spigot to the inner circumferential surface of the receptacle.

Next, the waterproof sheet 9 is laid on the bottom portion 4 and the straight wall 6 (step 113). In the collection and drainage pipe unit 10, the waterproof sheet 9 is arranged to cover the bottom plate 12 and the back plate 13, except for the pipe body 14a and the inside end 14b exposed from the back plate 13 to the inside of the field. The bottom plate 12 and the back plate 13 are then heat-welded to the waterproof sheet 9 spread on the bottom portion 4. Since the surface of the installation bottom 7 and the upper surface of the bottom plate 12 are constructed to be flush with each other, the work of heat-welding the waterproof sheet 9 to the bottom plate 12 is easy. In addition, since the surface of the installation back portion 8 and the inner surface of the back plate 13 are also constructed to be flush with each other, the work of heat-welding the waterproof sheet 9 to the back plate 13 is easy.

The waterproof sheet 9 here is made up of multiple layers, and as an example, is made up of a lower protective mat, a lower waterproof sheet, an intermediate protective mat, an upper waterproof sheet, etc. stacked together. They are laid one layer at a time in this order, starting from the bottom. Each sheet is an elastic sheet with various elasticities and flexibilities, such as a polyethylene sheet, an olefin-based thermoplastic sheet, or a polyvinyl chloride sheet. These waterproof sheets are thermoplastic resin sheets that can be heat-sealed.

Note that a step may be formed between the end of the bottom plate 12 and the bottom portion 4. For example, the surface of the bottom portion 4 before the waterproof sheet 9 is laid may be one step lower than the top surface of the bottom plate 12. In such cases, a filler such as a protective mat is used to fill the step. A protective mat consisting of an upper layer protective mat, a waterproof work protective mat, etc. is laid on the waterproof sheet 9 on the outer part of the support member 11. The protective mat is made of short fiber nonwoven fabric, long fiber nonwoven fabric, reinforcing felt, etc.

Next, the gap 19 between the upper surface of the bottom plate 12 and the lower portion of the outer circumferential surface of the pipe body 14a is filled with filler 20 (step 114). After that, a backfill material or the like is laid on the bottom portion 4. As an example, a form for pouring the filler 20 is installed on the bottom plate 12, and the filler 20 is filled into the form.

[Effects of the First Embodiment]
The first embodiment as described above can provide the following advantages.
(1-1) The collection and drainage pipe 14 protruding from the back plate 13 toward the inside of the facility makes it easy to connect to the bottom collection and drainage pipe 5. Furthermore, the inside end 14b is supported by the bottom plate 12, making it difficult for the collection and drainage pipe 14 protruding toward the inside of the facility to bend toward the bottom plate 12. As a result, the connection between the collection and drainage pipe 14 fixed to the support member 11 and the bottom collection and drainage pipe 5 can be ensured.

(1-2) Because the bottom plate 12 is disposed below the collection and drainage pipe 14, it is possible to prevent the leachate 2a from accumulating below the collection and drainage pipe 14. In addition, even if the waterproof sheet 9 needs to be joined to the bottom plate 12 by thermal welding, it is no longer necessary to extend it below the collection and drainage pipe 14. This also makes it easier to perform the thermal welding work between the waterproof sheet 9 and the bottom plate 12.

(1-3) The bottom plate 12 and the back plate 13 are joined by groove welding 15. Therefore, in the support member 11, the leakage of seepage water from the inside to the outside of the site can be suppressed at the corners between the bottom plate 12 and the back plate 13.

(1-4) The collection and drainage pipes 14 and the back panel 13 are joined by thermal welding 21. Therefore, leakage of seepage water from the inside to the outside of the site can be suppressed at the boundary between the collection and drainage pipes 14 and the back panel 13.

(1-5) In a closed system disposal site 1, the side walls of the storage site 2 are often constructed of straight walls 6, and the drainage pipe unit 10 is joined so that the bottom plate 12 and back plate 13 form a right angle. Therefore, the drainage pipe unit 10 can be fixed so that the back plate 13 is aligned with the straight wall 6.

(1-6) Even if the collection and drainage pipe 14 protrudes beyond the rear panel 13 on the inside of the facility, the inside end 14b is supported in contact with the upper surface of the bottom panel 12, so the connection between the inside end 14b and the bottom collection and drainage pipe 5 can be ensured.

(1-7) The fixation of the drainage pipe 14 to the support member 11 can be reinforced by reinforcing plates 22, 23, and 24.
(1-8) Specifically, the upper reinforcing plate 22 can prevent damage to the welded portion between the collection and drainage pipe 14 and the back plate 13 due to the load on the collection and drainage pipe 14 protruding toward the inside of the premises.

(1-9) The side reinforcement plate 23 can prevent damage to the welded portion between the bottom plate 12 and the back plate 13 and the welded portion between the collection and drainage pipe 14 and the back plate 13 due to the load on the support member 11 and the collection and drainage pipe 14 protruding inside the site.

(1-10) The outside-site reinforcement plate 24 can prevent the portion of the collection and drainage pipe 14 protruding from the back plate 13 to the outside of the site from shaking when pouring concrete outside the site.
(1-11) The waterproof sheet 9 is placed so as to cover the peripheral portions of the bottom plate 12 and the back plate 13, and the waterproof sheet 9 is heat-welded to the peripheral portions of the bottom plate 12 and the back plate 13. At this time, the welded portion provided on the inside of the corner portion 16b has a large area because the leg length L is equal to or greater than the plate thickness T of the back plate 13. Therefore, the waterproof sheet 9 can be placed along this portion as well. In other words, the waterproof sheet 9 can be placed on the inclined surface 16a without any gaps. This allows the waterproof sheet 9 to be placed on the inclined surface 16a without any gaps.

(1-12) Filler 20 is filled into gap 19. This allows the filler 20 to protect the lower portion of the outer peripheral surface of pipe body 14a, the end of inside end 14b on the pipe body 14a side, and corner 16b, which define gap 19. In addition, filler 20 supports the area of pipe body 14a between the end of inside end 14b and corner 16b, making this area of pipe body 14a less likely to bend toward the bottom plate 12.

(1-13) An anchor sheet 26 is provided on each of the outer surfaces of the bottom plate 12 and the back plate 13. Therefore, the outer surface of the bottom plate 12 can be firmly fixed to the installation bottom 7. Also, the outer surface of the back plate 13 can be firmly fixed to the installation back 8.

Second Embodiment
FIG. 13 shows a collection and drainage pipe unit 30 as a second embodiment. The collection and drainage pipe unit 30 is also installed in the closed system type disposal site 1. In this collection and drainage pipe unit 30, the collection and drainage pipe 14 does not have a receiving portion at the end inside the site. The lower part of the outer circumferential surface of the collection and drainage pipe 14 is in line contact with the upper surface of the bottom plate 12. In the first embodiment, a gap 19 is provided between the pipe body 14a and the bottom plate 12, but in this embodiment, no gap 19 is provided and no filler 20 is used. However, the lower part of the outer circumferential surface of the collection and drainage pipe 14 and the upper surface of the bottom plate 12 may be cosmetically welded. One end of such a collection and drainage pipe 14 and one end of the bottom collection and drainage pipe 5 are butt-welded or butt-jointed, for example.

The above-described drainage pipe unit 30 can also achieve the same effects as those of the drainage pipe unit 10 of the first embodiment.
Third Embodiment
[Open-type disposal site]
As shown in FIG. 14, the open-type disposal site 41 is a final disposal site where the storage site 42 for storing waste is not provided with a cover facility, and the landfill waste is stabilized by natural rainfall. In the open-type disposal site 41, a bottom collection and drainage pipe 45 for collecting and draining the leachate 2a is also arranged on the bottom surface 43 of the storage site 42. Backfill material is laid around the bottom collection and drainage pipe 45. The side walls of the storage site 2 are often composed of slope walls 44 rather than straight walls. In the open-type disposal site 41, a collection and drainage pipe unit 50 connected to the bottom collection and drainage pipe 45 is arranged at the corner formed by the bottom surface 43 and the slope wall 44. In the open-type disposal site 41, since the side walls are composed of the slope walls 44, it is difficult to use the collection and drainage pipe unit 10 and the collection and drainage pipe unit 30 of the first embodiment corresponding to the straight wall 6. The drainage pipe unit 50 in the third embodiment is configured so as to be installable in a corner portion formed by a bottom portion 43 and a slope wall 44 .

[Drainage pipe unit]
As shown in Fig. 15, the drainage pipe unit 50 includes a support member 51 that is installed at an installation location. The support member 51 also includes a bottom plate 52 and a back plate 53. The bottom plate 52 and the back plate 53 are molded bodies of thermoplastic resin, and are rectangular flat plates, for example. The inclination of the back plate 53 relative to the bottom plate 52 corresponds to the inclination of the installation back portion relative to the installation bottom portion at the installation location. The inclination of the back plate 53 relative to the bottom plate 52 corresponds to the inclination of the slope wall 44 relative to the bottom portion 43. In this embodiment, the inclination of the back plate 53 relative to the bottom plate 52 is an obtuse angle.

As in the first embodiment, one side of the bottom plate 52 and one side of the back plate 53 are joined by thermal welding 54. In addition, a decorative weld 54a is applied to the inside of the corner formed by one side of the bottom plate 52 and one side of the back plate 53. The decorative weld 54a forms a wide inclined surface so that the waterproof sheet 9 can be positioned along it, even at the corner. The collection and drainage pipe 14 is installed so that its pipe axis is parallel to the bottom plate 52.

The outer peripheral surface of the inside end 14b is supported by contacting the upper surface of the bottom plate 52. A gap 19 is provided between the upper surface of the bottom plate 52 and the lower part of the outer peripheral surface of the pipe body 14a, with a height corresponding to the difference between the outer diameter of the pipe body 14a and the outer diameter of the inside end 14b, which serves as the receiving portion. Filler 20 is packed into the gap 19.

As shown in Figures 15 and 16, in the collection and drainage pipe unit 50, the collection and drainage pipe 14 is fixed to the support member 51 by a reinforcing plate. Specifically, on the inner surface of the back plate 53, the collection and drainage pipe 14 and the back plate 53 are reinforced by an upper reinforcing plate 56. In addition, the collection and drainage pipe 14, the bottom plate 52, and the back plate 53 are reinforced by a side reinforcing plate 57.

The upper reinforcing plate 56 has an outer shape of a parallelogram. One diagonal angle of the upper reinforcing plate 56 is an acute angle, and the other diagonal angle is an obtuse angle, which corresponds to the angle of the corner between the upper part of the outer circumferential surface of the collection and drainage pipe 14 and the back plate 53. As a result, the upper reinforcing plate 56 is placed without any gaps in the corner between the upper part of the outer circumferential surface of the pipe body 14a and the back plate 53. The inner surface of the back plate 53 and the upper part of the outer circumferential surface of the pipe body 14a are joined by thermal welding 56b. The upper reinforcing plate 56 has holes 56a for engaging a hanging tool such as a hook. Such an upper reinforcing plate 56 prevents damage caused by the load on the collection and drainage pipe 14 protruding toward the inside of the site due to thermal welding between the pipe body 14a and the back plate 53.

The outer diameter shape of the side reinforcing plate 57 is also a parallelogram. The side reinforcing plate 57 has an acute angle on one diagonal and an obtuse angle on the other diagonal, which corresponds to the angle of the corner between the top surface of the bottom plate 52 and the back plate 53. As a result, the side reinforcing plate 57 is placed without any gaps in the corner between the top surface of the bottom plate 52 and the back plate 53. The top surface of the bottom plate 52, the inner surface of the back plate 53, and the outer peripheral side portion of the pipe body 14a in the side reinforcing plate 57 are joined by thermal welding 57b. The side reinforcing plate 57 has holes 57a for engaging a hanging tool such as a hook. In such a side reinforcing plate 57, the thermal welding 54 between the bottom plate 52 and the back plate 53 and the thermal welding 55 between the pipe body 14a and the back plate 53 suppress damage caused by the load on the collection and drainage pipe 14 protruding toward the inside of the site. The upper reinforcing plate 56 and the side reinforcing plate 57 have the same configuration, and the number of parts is reduced by sharing parts.

Furthermore, the collection and drainage pipe 14 and the back plate 53 are reinforced by the outside reinforcement plate 58 on the outer surface of the back plate 53. The outside reinforcement plate 58 has an outer diameter shape of a right triangle. The end face that abuts against the outer surface of the back plate 53 is composed of an inclined surface corresponding to the inclination of the outer surface of the back plate 53. The outside reinforcement plate 58 is arranged so that the right angle portion is located at the corner formed by the upper part of the outer peripheral surface of the pipe body 14a and the outer surface of the back plate 53. The outside reinforcement plate 58 is also arranged so that its plate surface is parallel to the bottom plate 52. As a result, the outside reinforcement plate 58 is arranged without any gaps between the upper part of the outer peripheral surface and the outer surface of the back plate 53. The outer surface of the back plate 53 and the side part of the outer peripheral surface of the pipe body 14a are joined by thermal welding 58a in the outside reinforcement plate 58. Such an outside-site reinforcement plate 58 can prevent the part of the collection and drainage pipe 14 that protrudes from the back plate 53 to the outside of the site from shaking when concrete is poured to form the back of the installation on the outside of the site.

The above-described collection and drainage pipe unit 50 can be manufactured in the same manner as the collection and drainage pipe unit 10 of the first embodiment. And, it can be installed at the installation location in the same manner as the collection and drainage pipe unit 10 of the first embodiment.

[Effects of the third embodiment]
The third embodiment as described above can provide the following advantages.
(3-1) In open-type disposal sites 41 and the like, which often have a sloped wall 44 , the drainage pipe unit 50 can also be installed at the corner between the bottom surface 43 and the sloped wall 44 .

(3-2) The difference between the drainage pipe unit 50 and the drainage pipe unit 10 is the angle of the back panel relative to the bottom panel. Therefore, the drainage pipe unit 50 can achieve the same effects as (1-1), (1-2), (1-4) to (1-11).

Fourth Embodiment
FIG. 17 shows a collection and drainage pipe unit 60 as a fourth embodiment. The collection and drainage pipe unit 60 is also installed in an open-type disposal site 41. In this collection and drainage pipe unit 60, the collection and drainage pipe 14 does not have a receiving portion at the end inside the site, as compared with the collection and drainage pipe unit 50 of the third embodiment. The lower part of the outer circumferential surface of the collection and drainage pipe 14 is in line contact with the upper surface of the bottom plate 12. In the third embodiment, a gap 19 is provided between the pipe body 14a and the bottom plate 12, but in this embodiment, no gap 19 is provided and no filler 20 is used. However, the collection and drainage pipe 14 and the upper surface of the bottom plate 12 may be cosmetically welded. One end of such a collection and drainage pipe 14 and one end of the bottom collection and drainage pipe 5 are, for example, butt fused.

The above-described drainage pipe unit 60 can also achieve the same effects as those of the drainage pipe unit 50 of the third embodiment.
[Modifications]
The drainage pipe unit as described above can be modified as follows.

- In the first to fourth embodiments, the anchor sheet 26 may be provided only on the outer surface of at least one of the outer surfaces of the bottom plate 12, 52 and the outer surface of the back plate 13, 53, as long as the anchor sheet 26 can be firmly attached to the installation location. In other words, the anchor sheet 26 may be provided only on the outer surface of the bottom plate 12, 52, or only on the outer surface of the back plate 13, 53. Furthermore, when the anchor sheet 26 is provided on at least one of the outer surfaces of the bottom plate 12, 52 and the outer surface of the back plate 13, 53, the anchor sheet 26 may be provided over the entire outer surface, or may be provided over a partial area of the outer surface.

The studs 26b may be integrally provided on the outer surfaces of the bottom panels 12, 52 and the back panels 13, 53. In this configuration, the anchors are provided at the same time that the bottom panels 12, 52 and the back panels 13, 53 are formed. This makes it possible to omit processes such as joining the anchor sheet 26.

- In the anchor sheet 26, the number of studs 26b per unit area is not particularly limited as long as it can be firmly installed in the installation location. In addition, the location where the studs 26b are installed is not particularly limited.

- The anchor sheet may be constructed by erecting rectangular pieces that engage with concrete on the outer surfaces of the bottom panels 12, 52 and the back panels 13, 53. In this case, the rectangular pieces provided on the outer surfaces of the bottom panels 12, 52 are provided to extend in the width direction. This makes it possible to prevent the bottom panels 12, 52 from shifting in the front-to-rear direction. Note that rectangular pieces may also be provided on the outer surfaces of the bottom panels 12, 52 and the back panels 13, 53 so as to extend in the front-to-rear direction. This makes it possible to prevent shifting in the width direction.

Furthermore, if the rectangular pieces on the outer surface of the back panel 13, 53 are provided so as to extend in the vertical direction, it is possible to prevent the pieces from shifting in the width direction.Furthermore, if the rectangular pieces are provided so as to extend in the width direction on the outer surface of the back panel 13, 53, it is possible to prevent the pieces from shifting in the front-back direction and the vertical direction.

In the first embodiment, the gap 19 between the upper surface of the bottom plate 12 and the lower portion of the outer circumferential surface of the tube body 14a does not need to be filled with filler 20 if there is another support means (see FIG. 5). Also, in the third embodiment, the gap 19 between the upper surface of the bottom plate 52 and the lower portion of the outer circumferential surface of the tube body 14a does not need to be filled with filler 20 if there is another support means (see FIG. 15).

- In the second embodiment, even if the collection and drainage pipe 14 does not have a receiving portion at its end on the inside of the premises, the filler 20 may be packed in the area where the lower part of the outer periphery of the collection and drainage pipe 14 and the upper surface of the bottom plate 12 come into contact. This makes it possible to prevent the collection and drainage pipe 14 from moving in that area, and to prevent the joint between the collection and drainage pipe 14 and the bottom plate 12 from being damaged. In the fourth embodiment, even if the collection and drainage pipe 14 does not have a receiving portion at its end on the inside of the premises, the filler 20 may be packed in the area where the lower part of the outer periphery of the collection and drainage pipe 14 and the upper surface of the bottom plate 52 come into contact. This makes it possible to prevent the collection and drainage pipe 14 from moving in that area, and to prevent the joint between the collection and drainage pipe 14 and the bottom plate 52 from being damaged.

- As in the second and fourth embodiments, even if a receiving portion is not provided at the site-side end of the collection and drainage pipe 14, a gap 19 may be provided between the lower part of the outer periphery of the collection and drainage pipe 14 and the upper surface of the bottom plate 12. For example, a pipe-side protruding part such as a protrusion or projection may be provided on the lower part of the outer periphery of the collection and drainage pipe 14. In such a case, the pipe-side protruding part abuts against the upper surface of the bottom plate 12, thereby forming a gap 19 between the upper surface of the bottom plate 12 and the lower part of the outer periphery of the collection and drainage pipe 14. In addition, a bottom plate-side protruding part such as a support piece for supporting the lower part of the outer periphery of the collection and drainage pipe 14 may be provided on the upper surface of the bottom plate 12. In such a case, the bottom plate-side protruding part abuts against the lower part of the outer periphery of the collection and drainage pipe 14, thereby forming a gap 19 between the upper surface of the bottom plate 12 and the lower part of the outer periphery of the collection and drainage pipe 14.

Even if a receiving portion is not provided at the on-site end of the collection and drainage pipe 14 as in the second and fourth embodiments, if a gap 19 is formed, it is preferable to fill the gap 19 with filler 20. This allows the filler 20 to support the lower portion of the outer periphery of the collection and drainage pipe 14 on the upper surface of the bottom plate 12.

- In the first and second embodiments, the decorative weld 16 does not have to be configured so that the leg length L is equal to or greater than the plate thickness T of the back panel 13 (see FIG. 5). As an example, if the inclined surface 16a can be arranged along the waterproof sheet 9, the leg length L may be less than the plate thickness T of the back panel 13. For example, if the waterproof sheet 9 is configured to have a small number of laminated sheets and is thin, the waterproof sheet 9 becomes more likely to bend. In such a case, the leg length L may be configured to be less than the plate thickness T of the back panel 13. Note that in the third and fourth embodiments, the leg length L may also be less than the plate thickness T of the back panel 53.

In the first and second embodiments, if other reinforcing plates are sufficient to withstand the load on the collection and drainage pipe 14, the outside reinforcing plate 24 may be omitted (see FIG. 4). Also, in the third and fourth embodiments, if other reinforcing plates are sufficient to withstand the load on the collection and drainage pipe 14, the outside reinforcing plate 58 may be omitted (see FIG. 16).

- In the first and second embodiments, if the strength against the load on the collection and drainage pipe 14 is sufficient with other reinforcing plates, the side reinforcing plate 23 may be omitted (see FIG. 3). Also, in the third and fourth embodiments, if the strength against the load on the collection and drainage pipe 14 is sufficient with only the provision of other reinforcing plates, the side reinforcing plate 57 may be omitted (see FIG. 15).

- In the first and second embodiments, if the strength against the load on the collection and drainage pipe 14 is sufficient with other reinforcing plates, the upper reinforcing plate 22 may be omitted (see FIG. 3). Also, in the third and fourth embodiments, if the strength against the load on the collection and drainage pipe 14 is sufficient with only the provision of other reinforcing plates, the upper reinforcing plate 56 may be omitted (see FIG. 15).

- In the first to fourth embodiments, the reinforcing plate may be any one of the upper reinforcing plate 22, 56, the side reinforcing plate 23, 57, and the outboard reinforcing plate 24, 58, or two of them.

- In the first to fourth embodiments, the number of upper reinforcing plates 22, 56, side reinforcing plates 23, 57, and outboard reinforcing plates 24, 58 is not particularly limited as long as sufficient strength can be ensured.

- In the first to fourth embodiments, the shape of the reinforcing plate is determined by the positional relationship between the collection and drainage pipe 14 and the bottom plate 12, 52 and the back plate 13, 53, and is not limited to a right triangle or a rectangle. For example, it may be a trapezoid or parallelogram, or may be a polygonal shape such as a pentagon or hexagon.

- In the first to fourth embodiments, as an example, a further reinforcing plate may be disposed between the upper reinforcing plate 22 and the side reinforcing plate 23. Also, in the first to fourth embodiments, all reinforcing plates on the inner surface of the back plate 13, 53 may be provided so as to extend radially from the outer circumferential surface of the collection and drainage pipe 14. Also, in the third and fourth embodiments, the field-side reinforcing plate 58 on the outer surface of the back plate 13, 53 may be provided so as to extend radially from the outer circumferential surface of the collection and drainage pipe 14. In the first and second embodiments, the side reinforcing plate 23 on the inner surface of the back plate 13, 53 may be provided so as to extend radially from the outer circumferential surface of the collection and drainage pipe 14.

- In the first and second embodiments, holes similar to holes 22a and 23a may be provided in the outboard reinforcing plate 24. Either or both of holes 22a and 23a may be omitted. In the third and fourth embodiments, holes similar to holes 57a and 58a may be provided in the outboard reinforcing plate 58. Either or both of holes 57a and 58a may be omitted.

- In the first to fourth embodiments, the protective sheet may be configured as a single layer, or as described above, may be configured as multiple layers. In the case of multiple layers, it is possible to configure the protective sheet by appropriately combining protective mats, waterproof sheets, etc.

- In the first to fourth embodiments, the support member 11 is not limited to a configuration in which an end face constituting one side of the back plate 13, 53 is butted against the upper surface of the bottom plate 12, 52 at a position along one side. For example, the support member 11 may be configured to butt an end face constituting one side of the bottom plate 12, 52 at a position along one side of the upper surface of the back plate 13, 53. Also, the end face of either the bottom plate 12, 52 or the back plate 13, 53 may be heat welded at a position separated from the other side of the other plate. In other words, the support member 11 may be T-shaped instead of L-shaped overall.

- In the first to fourth embodiments, the shapes of the bottom panels 12, 52 and the back panels 13, 53 are not limited to rectangular shapes, but may be polygonal, such as trapezoidal, triangular, or pentagonal. In addition, the edges may not be straight, but may be curved, such as an outwardly bulging arc shape, an inwardly recessed arc shape, or a wavy line shape.

Furthermore, the bottom plate 12, 52 and the back plate 13, 53 may be configured by joining additional plates or members. For example, the bottom plate 12, 52 and the back plate 13, 53 may be joined with a hook piece for engaging a hanging device such as a hook.

- Figure 18 is a modified example of the first embodiment. In the example of Figure 18, the support member 71 is not constructed by joining the bottom plate 12 and the back plate 13 by thermal welding as in the case of the support member 11 (see Figure 2), but is constructed by bending a series of rectangular plates so that the entire structure has an L-shape. With such a support member 71, the need for thermal welding between the bottom plate 12 and the back plate 13 is eliminated, making manufacturing easier.

In the first embodiment, the collection and drainage pipe 14 has a receiving portion at its inside end 14b, which is in contact with the bottom plate 12. The collection and drainage pipe 14 is directly supported on the bottom plate 12. In contrast, in the modified example shown in FIG. 18, the inside end 14b is spaced apart from the bottom plate 12, and the collection and drainage pipe 14 is indirectly supported on the bottom plate 12 via another element 72. The other element 72 here is a square timber or plate material such as wood, resin, metal, or concrete.

For example, if it becomes necessary to insert another pipe between the collection and drainage pipe 14 and the bottom plate 12 so as to cross the collection and drainage pipe 14, the gap 19 between the lower part of the outer circumferential surface of the pipe body 14a and the upper surface of the bottom plate 12 may not be enough space. In such a case, the collection and drainage pipe 14 can be further separated from the bottom plate 12 using other elements 72, making it possible to insert another pipe between the collection and drainage pipe 14 and the bottom plate 12. In addition, the filler 20 can also function as a support material for the other elements 72 by filling the space between the inside end 14b and the bottom plate 12.

The above concept may be applied to the second to fourth embodiments by separating the collection and drainage pipe 14 from the bottom plate 12, placing another element 72 between the collection and drainage pipe 14 and the bottom plate 12, and supporting the collection and drainage pipe 14 with the other element 72.

- In the first embodiment, the support member 11 is joined by thermal welding between the bottom plate 12 and the back plate 13, but an L-shaped metal fitting may be placed against the corner and the L-shaped metal fitting, the bottom plate 12, and the back plate 13 may be joined by bolts. In the second to fourth embodiments, an L-shaped metal fitting may be placed against the corner and the L-shaped metal fitting, the bottom plate 12, 52, and the back plate 13, 53 may be joined by bolts.

- In the first to fourth embodiments, the thermal welding 21, 55 may be omitted when joining the collection and drainage pipe 14 to the back plate 13, 53. In this case, the collection and drainage pipe 14 is indirectly fixed to the back plate 13, 53 through the reinforcing plates 22, 23, 24, 56, 57, 58.

- In the first to fourth embodiments, the collection and drainage pipe 14 may be an external pressure pipe or an internal pressure pipe. Whether to select an external pressure pipe or an internal pressure pipe as the collection and drainage pipe is appropriately selected depending on the installation location. Furthermore, the collection and drainage pipe 14 may not be a straight pipe, but may be a curved pipe bent at 90 degrees, 45 degrees, etc., depending on the location of use. Furthermore, the collection and drainage pipe 14 may be a branch pipe with a branching flow path. When the collection and drainage pipe 14 is a curved pipe, it may extend perpendicular to the back panel 13 on the inside of the premises and bend outside the premises, or it may extend perpendicular to the back panel 13 on the outside of the premises and bend inside the premises. When the collection and drainage pipe 14 is a branch pipe, it may branch inside the premises or it may branch outside the premises.

- In the first to fourth embodiments, the joint between the connection end of the off-site collection and drainage pipe and the outside-site end 14c of the collection and drainage pipe 14, and the joint between the inside-site end 14b and the connection end of the bottom collection and drainage pipe 45 may be a flange joint.

The drainage pipe 14 may be heat welded to the inner surface of the rear panel 13, 53 on the inside of the facility, around the through hole 17.
In the first to fourth embodiments, the inside end 14b may be configured as a spigot portion instead of a socket portion.

In the first to fourth embodiments, the outboard end 14c may be configured as a socket portion instead of a spigot portion.
In the first to fourth embodiments, both ends of the drainage collection pipe 14 may be configured as spigots, or both ends may be configured as receiving ports.

In the first to fourth embodiments, the reservoirs 2, 42 may be provided with monitoring equipment for detecting the location of damage to the waterproof sheet.
The disposal site may be located at great depths underground (at a depth not normally used for constructing basements (40 m or more underground), or at a depth not normally used for constructing building foundations (10 m or more below the surface of the supporting ground)).

Reference Signs List 1...Closed system disposal site 9...Waterproof sheet 10...Drainage collection pipe unit 12...Bottom plate 13...Back plate 14...Drainage collection pipe 14a...Pipe body 14b...Inside end of site 15...Groove welding 16...Decorative welding 16a...Inclined surface 19...Gap 20...Filling material 22...Upper reinforcing plate 23...Side reinforcing plate 24...Outside reinforcing plate L...Leg length T...Plate thickness

Claims (14)

A waste collection and drainage pipe unit provided at a waste storage site,
A support member including a bottom plate disposed at the bottom of an installation location in the storage facility and a back plate disposed at the rear of the installation location;
The back plate is penetrated from inside the storage field to outside the storage field, and at least a portion of the collection and drainage pipe is supported by the bottom plate, and the collection and drainage pipe is fixed to the back plate;
The bottom plate and the back plate are groove welded on the outside of the corner portion formed by the bottom plate and the back plate, and are cosmetically welded on the inside of the corner portion,
The decorative weld portion is provided so as to avoid a position corresponding to the collection and drainage pipe,
The leg length of the decorative weld is equal to or greater than the thickness of the back plate,
A waterproof sheet is arranged to cover the peripheral portions of the bottom plate and the back plate, except for the portion of the collection and drainage pipe exposed from the back plate to the inside of the facility and supported by the bottom plate,
The drainage pipe unit, wherein the waterproof sheet is arranged along an inclined surface formed in the decorative weld portion . The drainage pipe unit according to claim 1 , wherein the groove welded portion between the bottom plate and the back plate is joined by thermal welding. The collection and drainage pipe unit according to claim 1 , wherein the collection and drainage pipe and the back panel are joined by thermal welding. The drainage pipe unit according to claim 1 , wherein at least a portion of the drainage pipe is supported directly on the bottom plate or indirectly by another element. The drainage pipe unit according to claim 1 , further comprising a reinforcing plate that reinforces a connection between the support member and an outer circumferential surface of the drainage pipe. The drainage pipe unit according to claim 5, wherein the reinforcing plate is an upper reinforcing plate and is joined by thermal welding to an upper portion of the outer peripheral surface of the drainage pipe protruding from the back plate toward the inside of the field and to an inner surface of the back plate toward the inside of the field. The drainage pipe unit described in claim 5, wherein the reinforcing plate is a side reinforcing plate and is joined by thermal welding to the side portion of the outer peripheral surface protruding from the back plate of the drainage pipe toward the inside of the field, the upper surface of the bottom plate on the inside of the field, and the inner surface of the back plate on the inside of the field. The drainage pipe unit according to claim 5, wherein the reinforcing plate is an outside-of-field reinforcing plate and is joined by thermal welding to the outer peripheral surface of the drainage pipe protruding from the back plate of the drainage pipe to the outside of the field and to the outside outer surface of the back plate. The drainage pipe unit according to claim 1 , wherein the portion of the drainage pipe exposed from the rear panel to the inside of the facility and supported by the bottom plate is a receiving portion having an outer diameter larger than that of the pipe body. A gap may be formed between the lower portion of the outer circumferential surface of the drainage pipe protruding from the back plate toward the inside of the facility and the upper surface of the bottom plate,
The drainage pipe unit according to claim 1 , wherein the gap is filled with a filler. The drainage pipe unit according to any one of claims 1 to 4, wherein at least one of the outer surfaces of the bottom plate facing the installation bottom and the outer surface of the back plate facing the installation back is provided with an anchor. A method for disposing a wastewater collection and drainage pipe unit at a waste storage site, comprising the steps of:
The collection and drainage pipe unit includes a support member having a bottom plate and a back plate, and a collection and drainage pipe that penetrates the back plate from inside the storage facility to outside the storage facility and has at least a portion supported by the bottom plate, and is fixed to the back plate.
A step of placing the bottom panel on an installation bottom portion constituting the installation location and placing the back panel on an installation back portion constituting the installation location;
and a step of arranging a waterproof sheet so as to cover the peripheral portion of the support member, except for the portion of the collection and drainage pipe exposed from the back plate to the inside of the site that is supported by the bottom plate, and fixing the waterproof sheet to the surface of the support member on the inside of the site,
The drainage pipe unit includes:
The bottom plate and the back plate are groove welded on the outside of the corner portion formed by the bottom plate and the back plate, and are cosmetically welded on the inside of the corner portion,
The decorative weld portion is provided so as to avoid a position corresponding to the collection and drainage pipe,
The leg length of the decorative weld is equal to or greater than the thickness of the back plate,
In the step of placing the waterproof sheet, the waterproof sheet is placed so as to be aligned along an inclined surface formed in the decorative weld portion . The installation method according to claim 12, wherein the groove weld between the bottom plate and the back plate is joined by thermal welding. The installation method according to claim 12 or 13, further comprising a step of filling a filler into a gap between a lower portion of the outer circumferential surface of the drainage pipe protruding from the rear panel toward the inside of the facility and the upper surface of the bottom panel when the gap is formed.

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