JPH0868067A - Infiltration groundwater removal device in heat storage tank - Google Patents

Abstract

(57) [Summary] [Purpose] In the heat storage tank installed in the underground part of the concrete structure, form a water intake channel for infiltration of groundwater,
The groundwater that has entered between the concrete wall inside the tank and the waterproof material such as the heat insulating material and the waterproof sheet or the waterproof plate is smoothly discharged out of the tank. (EN) Manufacturing of a water collecting channel material forming a water collecting channel portion is made easy and inexpensive, material cost is made low and construction is made easy, and construction cost of a heat storage tank is reduced. [Structure] On the upper surface of the bottom wall 3 of the heat storage tank 2, a required number of water collecting channel members 11 having an inverted U-shaped cross section and having a height substantially equal to the thickness of the heat insulating material 7 are arranged adjacent to each other at their end portions. They are arranged in series so as to abut each other. Side wall corner cutouts 12 and 12 are provided on both left and right side walls 11a and 11a at both front and rear ends of each water collecting channel material 11.
A water passage 14 having a substantially triangular shape when seen from the side surface communicating with the inside of the water collection passage 13 is formed in a tunnel shape at the abutting portion of 11, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing infiltrated groundwater in a heat storage tank.

[0002]

2. Description of the Related Art Conventionally, a heat insulating material is laid on the inner surfaces of a bottom wall and a peripheral side wall of a heat storage tank provided in an underground portion of a concrete structure, and a waterproof sheet is provided on the surface of the heat insulating material. A heat storage tank in which a required portion is fixedly stretched is already known.

[0003]

In the conventional heat storage tank described above, when water is usually stored in the tank and the waterproof sheet adheres to the concrete wall or the surface of the heat insulating material due to the stored water, , It is difficult for groundwater from the outside to enter the tank, but for example, when the concrete wall of the heat storage tank is cracked or when the groundwater pressure outside the tank is higher than the water pressure inside the tank. The groundwater invaded the tank, and the groundwater stayed between the tank bottom wall and the waterproof sheet or between the tank bottom wall and the heat insulating material and the waterproof sheet. As a result, corrosion of the steel plate bonded body fixed to the bottom wall and its fixing metal fittings is promoted, and there is a problem that the fixed portion of the waterproof sheet may come off from the concrete wall or the waterproof sheet may be broken. It was

In order to solve such a problem, the present applicant has previously found that a reverse U-shaped cross section having a height substantially equal to the thickness of the heat insulating material is formed on the upper surface of the bottom wall of the heat storage tank below the waterproof sheet. We proposed a device for removing infiltrated groundwater in which water channels are formed by arranging adjacent channel members so that their end portions abut each other.
(See Japanese Patent No. 8551).

However, according to the previously proposed infiltration groundwater removing device, the water collecting channel material is formed with a plurality of inverted U-shaped notches for water passage at predetermined intervals at the lower edges of the side walls. Since the channel material has a complicated shape, it is manufactured individually using a mold of a special shape, for example, by a casting method, or is made of a drawn material or an extruded material. Cut the lower edges of both side walls of a channel material with an inverted U-shaped cross section
Must be manufactured by forming a large number of water-cutting notches at regular intervals, so that the production of the channel material for collecting water is very troublesome, and by extension, the heat storage that has the function of eliminating infiltration groundwater. There was a new problem that the construction cost of the tank was high.

The object of the present invention is to solve the above problems,
The channel material for collecting water can be manufactured very easily and cheaply from a long material consisting of drawn material and extruded shape material, the material cost is low, and eventually the construction of a heat storage tank having a function of eliminating infiltrated groundwater. Cost is easy, of course,
The concrete wall in the heat storage tank and the groundwater that entered between the heat insulating material and the waterproof material such as the waterproof sheet or the waterproof plate can be discharged very smoothly to the outside of the heat storage tank, and the construction is simple, Moreover, it is an object of the present invention to provide a device for eliminating infiltrated groundwater in a heat storage tank, which has a good heat insulating property and can maintain an excellent heat storage effect.

[0007]

In order to achieve the above object, the present invention provides a heat insulating material laid on the inner surfaces of the bottom wall and the peripheral side wall of a heat storage tank provided in the underground portion of a concrete structure. , Waterproof material is laid on the surface of the heat insulating material,
On the upper surface of the bottom wall of the bottom of the waterproof material, a required number of water collecting channel members having a reverse U-shaped cross section and having a height approximately equal to the thickness of the heat insulating material are arranged adjacent to each other, and the front end portion and the rear end portion thereof are connected to each other. In the heat storage tank in which the water collecting passages are formed by arranging them in series so that they are abutted against each other, side wall corner cutouts are provided on the left and right side walls at the front and rear ends of each water collecting channel member, and In the abutting portion of the water collecting channel material that fits, a substantially triangular water passage is formed in a tunnel shape as seen from the side surface that communicates with the side wall corner cutouts of both channel materials, and is seen from the side surface. The main point is a device for removing infiltrated groundwater in a heat storage tank.

In the above, the apparatus for removing infiltrated groundwater in a heat storage tank according to the present invention is a so-called insulation in which a waterproof sheet is stretched in a fixed state on a surface of a heat insulating material laid on the bottom wall of the heat storage tank. Not only the heat storage tank formed by the construction method, but also the heat insulation on the surface of the heat insulating material on the bottom wall of the tank, laying a waterproof plate made of a hard synthetic resin plate such as a fiber reinforced plastic (FRP) plate or a hard vinyl chloride resin plate. The same applies to a heat storage tank formed by a waterproof method.

Here, fiber reinforced plastic (FRP)
A plate or a waterproof plate made of a hard synthetic resin plate such as a hard vinyl chloride resin plate is attached to the surface of the heat insulating material in advance and integrated, and the heat insulating material with the waterproof plate is laid on the upper surface of the bottom wall of the tank. Sometimes.

In this case, a gap for fitting the water collecting channel material is formed in advance in the heat insulating material, and when the heat insulating material with the waterproof plate is laid on the upper surface of the bottom wall of the tank, water is collected in the gap. After inserting the channel material for water and laying the heat insulating material with the waterproof plate and the channel material for collecting water at the same time, the heat insulating material with the waterproof plate may be fixed to the bottom wall of the tank by the fixture.

[0011]

In the above heat storage tank, when the concrete wall of the heat storage tank is cracked, or when the water pressure of the groundwater outside the tank is higher than the water pressure in the tank, the groundwater that has entered the tank is , A synthetic resin waterproof sheet, a fiber reinforced plastic (FRP) plate, or a waterproof plate made of a hard synthetic resin plate. At this time, the inflowing groundwater is collected very smoothly by the tunnel-shaped water passage part that is a substantially triangular shape as seen from the side face formed at the abutting part of each water collecting channel material, and the infiltration groundwater is collected in the water collection channel part. It is quickly collected and discharged from the groundwater storage tank (spring water tank) adjacent to the heat storage tank to the outside of the tank by a pump that operates continuously or periodically.

The water collecting channel material that forms the water collecting passage portion inside the heat storage tank is obtained by cutting a long material made of, for example, a synthetic resin drawn material or extruded shape material to a predetermined length, and both front and rear ends thereof. It can be easily made by cutting off the corners of the left and right side walls diagonally, and the manufacturing cost of the channel material for collecting water with the side wall corner cutout is low, and eventually the heat storage tank with the function of eliminating infiltration groundwater. Construction costs are low.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

First, in FIGS. 2 and 3, four heat storage tanks (2), which are rectangular in plan view, are provided in the underground portion of the concrete structure (1). Each heat storage tank (2) is surrounded by a concrete bottom wall (3), a side wall (4) and a top wall (5), and the bottom wall (3) and the side wall (4) of the heat storage tank (2) are surrounded. The heat insulating material (7) is laid on the inner surface of () with the required part fixed. The surface of the heat insulating material (7) of these bottom wall (3) and peripheral side wall (4) is covered with a waterproof sheet (6) over the entire surface through a plasticizer migration prevention sheet (cross sheet) (8). (See Figures 4 and 5), waterproof sheet (6) and plasticizer migration prevention sheet
Each required part of (8) is fixed to the bottom wall (3) and the peripheral side wall (4) via the joints (9) (10), and the joints (9) (10) are fixed by the fixtures (16). The heat storage tank (2) is stretched so that the required parts are fixed to the tank bottom wall (3) and the peripheral side wall (4), and the heat storage tank (2) is formed by a so-called insulation method.

On the upper surface of the bottom wall (3) of the waterproof sheet (6),
A required number of water collecting channel members (11) having an inverted U-shaped cross section (see FIG. 5) having a height approximately equal to the thickness of the heat insulating material (7) are arranged adjacent to each other, and the front end portion and the rear end portion are connected to each other. By arranging them in series so as to abut on each other, the water collection channel (13)
Are formed. In this example, the bottom wall of the heat storage tank (2)
(3) The water collection channel (13a) is provided over the entire length in the center of the width of the upper surface, and the water collection channel (13b) is branched from the center of the length of the water collection channel (13a). They are arranged in a substantially T shape when viewed from the plane.

As shown in detail in FIGS. 1, 4 and 6, the left and right side walls (11) at both front and rear ends of each water collecting channel material (11).
Side wall corner cutouts (12) and (12) are provided on a) and (11a), and at the abutting portions of the adjacent water collecting channel materials (11) and (11),
Side wall corner cutouts (12) (12) of both channel materials (11) (11)
The water passage portion (14) having a substantially triangular shape when viewed from the side surface communicating with the water collection passage portion (13) is formed in a tunnel shape.

Here, the water collecting channel material (11) forming the water collecting passage portion (13) is obtained by cutting a long material made of a vinyl chloride resin drawing material or an extruded material into a predetermined length. The corners of both left and right side walls (11a) (11a) at both front and rear ends are 45 °
The side wall corner cutouts (12) and (12) are formed by cutting off at an angle of.

Further, adjacent water collecting channel members (11) (1
1) When the comrades are arranged in series so that the front end and the rear end face each other, a slight gap (15) is opened between the front end and the rear end, A fixed joint (16) is interposed, which is a circular joined body when seen from the plane.
(9) is placed across the upper surface of the ends of the adjacent water collecting channel materials (11) and (11), and the bottom wall of the tank is fixed by the fixture (16).
It is fixed to (3).

A fixing tool (16) made of a curl plug
Is a synthetic resin open-ended outer cylinder (1
7) and steel wood screws (18). Fixture
As (16), open leg nails may be used.

The joint body is the bottom wall of the heat storage tank (2).
In the middle part of (3) and the side wall (4), as described above,
Use circular joints (9) (see Fig. 1) or flat strip joints. Also, the tank bottom wall (3) and peripheral side wall (4)
At the corners of the strip-shaped joined body (10) having a substantially L-shaped cross section (see FIG. 7).
See).

As shown in FIGS. 2, 3, 5, and 7, the left edge of the building (1) is located on the side opposite to the heat storage tank (2) through the side wall (4). Storage tank (spring water tank) (2
2) is provided. Then, the side wall of the heat storage tank (2) that intersects with the tip of the water collection channel (13) provided on the upper surface of the bottom wall (3) of the tank.
(4) At the lower end, specifically, heat storage tanks adjacent to each other (2)
(2) Drainage holes (20) are drilled through at the bottom of the side wall (4) between the heat storage tank (2) and the storage tank (22). The tip of (13) is connected. These drain holes (20) are formed by fitting a hole wall component member (21) made of vinyl chloride resin having a substantially semicircular cross section into the through hole formed at the lower end of the tank side wall (4). It is a thing.

On the left side edge of the building (1), the side wall
(4) A groundwater suction pipe (23) equipped with a pump (P) at the lower end is provided in a storage tank (spring water tank) (22) that receives groundwater from the drain hole (20) at the lower end. Suction pipe (2
The upper end of 3) is connected to an appropriate drainage channel (not shown).

As the heat insulating material (7), for example, resin foam such as polystyrene, polyvinyl chloride, polyurethane and polyethylene is used. Of these, it is economical to use polystyrene foam. Is advantageous. The thickness of the heat insulating material (7) is about 25 to 100 mm.

As the waterproof sheet (6), a sheet made of thermoplastic synthetic resin such as soft polyvinyl chloride, polyethylene, polypropylene or the like, a non-vulcanized rubber type sheet, a rubber asphalt type sheet or the like is used. In this respect, it is preferable to use a soft polyvinyl chloride sheet. The thickness of this waterproof sheet (6) is usually about 1.0 to 2.0 mm.

In the plasticizer-transfer waterproof sheet (8), the waterproof sheet (6) is made of, for example, a soft vinyl chloride sheet, and the heat insulating material (7) is made of a foam of polystyrene or polyvinyl chloride. As the plasticizer migration prevention sheet (8), for example, a composite of a foam of resin such as polyethylene or polypropylene and a woven cloth (cross sheet), or a film of these resins is used. To do.

Further, as the joined body (9) (10), a hard or semi-hard synthetic resin plate, a metal plate, or a plate material such as a steel plate coated with vinyl chloride resin on one side or both sides to improve adhesiveness use.

As the adhesive for joining the waterproof sheet (6) to the joined bodies (9) and (10), epoxy-based, urethane-based, and rubber-based adhesives can be used, but especially the waterproof sheet (6) is bonded. When both the joint surfaces of the bodies (9) and (10) are made of vinyl chloride resin, excellent durability can be obtained by using tetrahydrofuran alone or a solvent-type adhesive prepared by dissolving a small amount of vinyl chloride resin in tetrahydrofuran. It is preferable because it produces an adhesive effect.

In the above, groundwater that has entered through the cracks of the concrete side wall (4) of the heat storage tank (2) flows between the heat insulating material (7) below the waterproof sheet (6) and the side wall (4). Migrate,
It reaches the bottom wall (3), where it joins with the groundwater that has entered through cracks in the bottom wall (3). These infiltrated groundwater are stored in the heat storage tank (2).
Inside the bottom of the tarpaulin (6) bottom wall (3),
Make sure that the required number of water collecting channel members (11) having a reverse U-shaped cross section and having a height approximately equal to the thickness of the heat insulating material (7) are adjacent to each other, with their front and rear ends abutting each other. The water is collected in the water collection channel part (13) formed by being arranged in series.

At this time, side wall corner cutouts are formed on the left and right side walls (11a) (11a) at both front and rear ends of each water collecting channel material (11).
(12) (12) is provided, both channel materials (11) (11) at the abutting part of adjacent water collecting channel materials (11) (11)
Due to the side wall corner cutouts (12) (12), the water passage (14), which has a substantially triangular shape when viewed from the side that leads to the inside of the water collection channel (13), is formed like a tunnel, so the collection of infiltrated groundwater is extremely difficult. It is carried out smoothly and the infiltrated groundwater is quickly collected in the water collection channel (13).

Further, the infiltrated groundwater is drained from the tip of the water collecting channel (13) to the drain hole (20) provided on the side wall (4) of the heat storage tank (2).
It passes through to the groundwater storage tank (spring water tank) (22) adjacent to the heat storage tank (2) and is stored in this storage tank (22). And groundwater is a pump that operates continuously or periodically.
It is discharged to the outside by (P).

As described above, the infiltrated groundwater on the surface of the bottom wall (3) of the heat storage tank (2) is stored in the groundwater storage tank (22) outside the heat storage tank (2).
Since it is discharged to the suction pipe, even if there is a problem with the suction pipe (23), pump (P), etc., it can be easily repaired and maintenance can be performed very easily and reliably. .

When constructing the heat storage tank (2),
As shown in Fig. 3, the heat insulating material (7) was laid on the upper surface of the bottom wall (3) of the tank using the intermediate joint (9) and the fixture (16), and the required number of cross-sections was used. Inverted U-shaped water collecting channel members (11) are arranged in series so that the front end portion and the rear end portion of adjacent ones abut each other, and the water collecting channel portion (1
3) and adjacent channel material for water collection (1
1) At the abutting part of (11), the water flow of a substantially triangular shape when viewed from the side that leads to the inside of the water collection channel (13) by the side wall corner cutouts (12) (12) of both channel materials (11) (11) The part (14) may be formed in a tunnel shape. A waterproof sheet (6) and a plasticizer migration prevention sheet (cross sheet) (8) may be stretched over the surfaces of the heat insulating material (7) and the water collecting channel material (11). Therefore, the construction work is very easy.

Furthermore, a heat insulating material (7) is laid on the entire inner surfaces of the bottom wall (3) and the peripheral side wall (4) of the heat storage tank (2), and is composed of a required number of water collecting channel materials (11). The waterway (13) is
Since it is only slightly installed in series on the upper surface of the bottom wall (3) of the heat storage tank (2), it does not impair the heat insulating property of the heat storage tank (2) and can retain an excellent heat storage effect. It is a thing.

In the above embodiment, the corner portions of the left and right side walls (11a) (11a) at both the front and rear ends of the water collecting channel material (11) forming the water collecting channel portion (13) are formed at an angle of 45 °. The side wall corner cutouts (12) and (12) are formed by being cut off obliquely at, and the cutting angle of these side wall corner cutouts (12) and (12) is about 30 to 60 °. preferable.

Further, in the above embodiment, the case of applying the infiltrated groundwater removing device according to the present invention to the heat storage tank (2) formed by the so-called insulation method is shown. Is not limited to this, the fiber reinforced plastic (FR
P) Heat insulation waterproofing method (not shown) for laying a waterproof plate made of a hard synthetic resin plate such as a plate or a hard vinyl chloride resin plate
The same applies to the heat storage tank formed by.

In this case, fiber reinforced plastic (FR
P) plate or a waterproof plate made of a hard synthetic resin plate such as a hard vinyl chloride resin plate and the surface of the heat insulating material on the heat storage bottom wall, and the plasticizer migration prevention sheet (cross sheet).
(8) may be interposed.

Further, here, the waterproof plate made of the above-mentioned fiber reinforced plastic (FRP) plate or a hard synthetic resin plate such as a hard vinyl chloride resin plate is attached to the surface of the heat insulating material in advance and integrated. A heat insulating material with a waterproof plate may be laid on the upper surface of the bottom wall of the tank.

In this case, a gap in which the water collecting channel material is fitted is previously formed in the heat insulating material, and when the heat insulating material with the waterproof plate is laid on the upper surface of the bottom wall of the tank, water is collected in the gap. After inserting the channel material for water and laying the heat insulating material with the waterproof plate and the channel material for collecting water at the same time, the heat insulating material with the waterproof plate may be fixed to the bottom wall of the tank by the fixture.

The seams of the waterproof sheet or waterproof plate or the exposed surface of the waterproof plate of the fixture are appropriately sealed with a sealing material, an FRP lining material or the like to seal them.

[0040]

As described above, according to the present invention, the heat insulating material is laid on the inner surfaces of the bottom wall and the peripheral side wall of the heat storage tank provided in the underground portion of the concrete structure, and the synthetic resin is formed on the surface of the heat insulating material. Waterproof sheet, fiber reinforced plastic (F
RP) plate or a waterproof material such as a waterproof board made of a hard synthetic resin plate is laid, and the required number of cross-section inverted U-shaped having a height approximately equal to the thickness of the heat insulating material on the upper surface of the tank bottom wall under the waterproof material. In the heat storage tank in which the water collecting channel is formed by arranging the water collecting channel members in series so that the front end and the rear end of each other are adjacent to each other,
Side wall corner cutouts are provided on both left and right side walls at the front and rear ends of each water collection channel material, and the side wall corner cutouts of both channel materials lead to the inside of the water collection channel at the abutting portions of adjacent water collection channel materials. The water flow portion having a substantially triangular shape when viewed from the side is formed in a tunnel shape.According to the heat storage tank according to the present invention, for example, groundwater that has intruded from cracks in the side wall of the concrete tank is Moving between the heat insulating material and the concrete wall, reaching the bottom wall of the tank,
There, it joins with the groundwater that has entered through cracks in the bottom wall. In the heat storage tank, the infiltrated groundwater is collected in a water collecting channel portion composed of a required number of channel members for collecting water having a reverse U-shaped cross section, which are arranged in series on the upper surface of the tank bottom wall below the waterproof material.

At this time, the infiltrated groundwater is collected very smoothly by the tunnel-shaped water passage portion having a substantially triangular shape as seen from the side face formed at the abutting portion of each water collecting channel material, and the infiltrated groundwater is collected. From the groundwater storage tank (spring water tank) that is quickly collected in the waterway and is adjacent to the heat storage tank,
It is discharged to the outside of the tank by a pump that operates continuously or periodically.

The water collecting channel material forming the water collecting passage in the heat storage tank is obtained by cutting a long material made of, for example, a synthetic resin drawn material or an extruded material into a predetermined length, and both front and rear ends thereof. It can be easily made by cutting off the corners of the left and right side walls diagonally, and the manufacturing cost of the channel material for collecting water with the side wall corner cutout is low, and eventually the heat storage tank with the function of eliminating infiltration groundwater. Construction costs are low.

When constructing a heat storage tank, a required number of water collecting channel members having an inverted U-shaped cross section having such side wall corner cutouts are provided on the upper surface of the bottom wall of the tank as the front end portions of adjacent ones. After arranging the rear ends in series so as to abut each other to form a water collection channel, lay a heat insulating material on the entire inner surface of the bottom wall and peripheral side walls of the heat storage tank, and also make a synthetic resin waterproof sheet and fiber reinforced Since it is sufficient to lay a waterproof material such as a waterproof plate made of a plastic (FRP) plate or a hard synthetic resin plate, the construction work is very simple.

When the waterproof plate is previously attached to the surface of the heat insulating material to be integrated and the heat insulating material with the waterproof plate is laid on the upper surface of the tank bottom wall, the water collecting channel material is fitted into the heat insulating material. When a gap is formed in advance and a heat insulating material with a waterproof plate is laid on the upper surface of the tank bottom wall, a water collecting channel material is fitted into the gap to form a heat insulating material with a waterproof plate and a water collecting channel material. After laying at the same time to form the water collecting channel portion, the heat insulating material with the waterproof plate may be fixed to the bottom wall of the tank by the fixing tool, so that the construction work is very simple in any case.

Further, the water collecting channel portion made of the channel material for collecting water is provided on the upper surface of the bottom wall of the heat storage tank in a small number in series, and heat insulation is provided on the entire inner surface of the bottom wall and the peripheral side wall of the heat storage tank. Since the material is laid, there is an effect that an excellent heat storage action can be maintained without impairing the heat insulating property of the heat storage tank.

[Brief description of drawings]

FIG. 1 is a perspective view of a bottom wall portion of a heat storage tank showing an embodiment of an infiltration groundwater elimination device of the present invention, showing a state before a waterproof sheet is stretched.

FIG. 2 is a schematic partial plan view of a building having a heat storage tank equipped with the infiltration groundwater elimination device of the present invention, showing a state before the waterproof sheet is stretched.

FIG. 3 is a schematic partial vertical sectional view of the building, showing a state before the waterproof sheet is stretched.

FIG. 4 is an enlarged vertical cross-sectional view of the water collecting passage portion of the infiltration groundwater elimination device of the present invention, taken along the line AA of FIG.
Moreover, the state after the waterproof sheet is stretched is shown.

5 is an enlarged cross-sectional view of the same, taken along the line BB in FIG. 2, showing a state after the waterproof sheet is stretched, and the drain hole wall constituting member is also shown.

FIG. 6 is an enlarged perspective view of only the water collecting channel material.

FIG. 7 is an enlarged vertical cross-sectional view of a drain hole portion of a side wall between the heat storage tanks of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Heat storage tank 3 Bottom wall 4 Peripheral side wall 6 Waterproof sheet (waterproof material) 7 Insulation material 9 Intermediate joint body 10 Corner joint body 11 Channel material for reverse U-shaped cross section 11a Left and right side walls 12 Side wall Corner excision part 13 Water collection channel part 14 Water passage part of a substantially triangular shape when seen from the side 16 Fixture

Claims (1)

[Claims] 1. A heat insulating material (7) is laid on the inner surfaces of a bottom wall (3) and a peripheral side wall (4) of a heat storage tank (2) provided in an underground portion of a concrete structure (1), and heat insulation is performed. The waterproof material (6) is laid on the surface of the material (7), and the waterproof material (6) is below the bottom wall (3) of the tank.
On the upper surface, the required number of water collecting channel members (11) having an inverted U-shaped cross section and having a height substantially equal to the thickness of the heat insulating material (7) are adjacent to each other, and the front end portion and the rear end portion thereof are butted against each other. By arranging in series in this way, in the heat storage tank (2) in which the water collecting passage part (13) is formed, the left and right side walls (11a) at both front and rear ends of each water collecting channel material (11) Side wall corner cutouts (12) and (12) are provided in (11a), and both channel materials (11) are provided at the abutting portions of adjacent water collecting channel materials (11) and (11).
Side wall corner excision part (12) of (11) (12)
3) A device for removing infiltrated groundwater in a heat storage tank, characterized in that a water passage portion (14) having a substantially triangular shape when viewed from a side surface communicating with the inside is formed in a tunnel shape.