JP6563852B2 - Water storage structure and water storage method in underground water tank - Google Patents

Description

  The present invention relates to a water storage structure and a water storage method for providing a water storage tank or a reservoir for storing rainwater in the basement while using the ground for another purpose such as a parking lot or a garden. It is an object of the present invention to provide a water storage structure and a water storage method capable of easily forming a water storage tank, saving labor costs and shortening the construction period, and preventing human construction errors.

  In general, in areas where there is no underground aquifer, or in areas where water resources are scarce, such as where it is difficult to partition the aquifer even if there is a natural aquifer underground, A water tank is formed to secure water resources. In addition, in order to secure fire prevention water and industrial water in urban areas, water tanks with artificial water storage spaces are provided in the basement of buildings, parks and parking lots, etc., so that rainwater flows efficiently into the water tank A system is being created. Since such a water tank is used for a parking lot or a park above the water storage space, it must be sufficiently resistant to pressure from above. Therefore, the filling material is arranged and filled in the water storage space to increase the strength, and gravel or crushed stone is often used as the filling material. However, these gravels and crushed stones are often difficult to obtain, depending on the land, and are often expensive. Moreover, even if there is a vast recess for storing water, when using gravel or crushed stone, at least the volume of gravel or crushed stone will reduce the amount of water stored. Usually, when crushed stone is used as the filling material, the water storage rate is about 40% of the entire volume of the recess, and the remaining 60% is taken up by the crushed stone.

  In Patent Document 1, in a water storage method for forming a water storage tank in which a block filling material is disposed in a water storage space surrounded by a water shielding sheet, a water shielding molded body in which a water shielding sheet is formed in a layered shape is recessed. It is disclosed that it is disposed at a place and then a filling material is disposed in the water-impervious molded body. Further, in Patent Document 2, in a water storage tank in which a filling material is disposed in a water storage space in which a water shielding sheet is laid on a base formed in a concave shape, the base is composed of a sloped surface and a bottom surface that are inclined surfaces. In a water storage space in which a water sheet is laid, there is described a water storage tank or the like characterized in that a block filling material and a small size filling material are used in combination. Patent Document 3 describes an enveloping body that is used for an underground water tank configured by enclosing a synthetic resin water storage block group in liquid nectar with an enveloping body.

  The block filling material as disclosed in the above Patent Documents 1 to 3 is a molded body made of a material such as a resin, and withstands the pressure from above and is compared with the capacity of the entire recess for storing water. Thus, it is possible to increase the water storage rate to 90% or more.

JP 2001-279737 A JP 2001-40719 A JP 2013-79524 A

  However, as described above, the filling material is replaced with gravel or crushed stone instead of block filling material, and the block filling material is wrapped with a water shielding sheet and a protective sheet. (See below) has the following problems. (1) When trying to wrap the block filling material in the stacked block with a water shielding sheet, the water shielding sheet is used to fit the water shielding sheet at the corner (corner part, specifically the side part or apex part of the filling material). There were cases where the sheet was bent or unnecessary parts were cut off, which was troublesome. Moreover, there exists a problem that the possibility of the water leak by cutting off a part of water-impervious sheet increases. (2) Since the side wall or upper surface is not a flat surface, the block body filling material may shift when wrapped with block sheets, especially at the corners. Construction will be difficult. (3) When the height of the stacked block body filling material is high, it is difficult to lift the temporarily laid water shielding sheet and cover the block body filling material side. Due to the above problems, the work at the time of installing the water shielding sheet becomes difficult (particularly in the corner portion), the workmanship is easily influenced by the worker, and the labor cost is increased.

  Therefore, the present invention improves the workability of the corners of the stacked block body filling material, so that the construction of the water storage tank is simpler, the performance is hardly affected by the skill level of the operator, and the labor cost The purpose of this project is to provide a water storage structure and a water storage method that can reduce costs.

The present invention is a water storage method for forming a water storage tank by covering a block-shaped filling material having a gap capable of storing water with a water shielding sheet,
A water storage method characterized in that a corner type object having a shape covering the side part is arranged on a side part of the filling material, and the filling material on which the corner type object is arranged is covered with the water shielding sheet. It is.

  According to the above construction method, when the filling material is covered with the water-impervious sheet by arranging a corner-shaped article having a shape covering the side portion on the side portion of the filling material having unevenness due to the gap, It is possible to prevent the sheet from being caught on the side portion of the filling material having irregularities and prevent the filling material from shifting. This improves the workability of the side portion of the block-shaped filling material, makes it easier to form the water tank, makes it less likely to be affected by the skill level of the operator, and reduces labor costs and other costs. can do.

  Further, the present invention is the above-described water storage method, wherein the corner mold has a three-pronged shape, and the three-corner corner mold is disposed so as to cover the apex portion of the block-shaped filling material. It is characterized by including.

  According to the above construction method, the vertex portion (intersection of the three sides) of the filling material can be covered with the trifurcated corner mold by a simple construction procedure. Thereby, the workability of the apex part of the block-shaped filling material can be improved.

  Further, in the water storage method according to the present invention, the corner-shaped object has an L-shape in cross-section, and is arranged so as to cover at least a part of one side of the block-shaped filling material. It is characterized by including the L-shaped corner type thing.

  According to the above construction method, the side portion of the filling material can be covered by a simple construction procedure. Thereby, the workability of the side part of the block-shaped filling material can be improved.

  Moreover, the present invention is characterized in that, in the above-described water storage method, the corner-type object has a flat shape at a portion in contact with the water shielding sheet.

  According to the above construction method, when the filling material is covered with the water shielding sheet, the corner type object has a flat shape in contact with the water shielding sheet. Workability at the time of shifting or bending can be improved.

Further, the present invention is a block-shaped filling material having a gap capable of storing water,
A water shielding sheet covering the filling material;
A corner mold that is disposed between the side portion of the filling material and the water-impervious sheet, and has a shape that covers the side portion of the filling material;
It is a water storage structure characterized by comprising.

  According to the above-described structure, by arranging a corner-shaped object having a shape covering the side portion of the filling material between the side portion of the filling material having unevenness due to the gap and the water shielding sheet, the filling material and the shielding material are blocked. It is possible to prevent the water sheet from coming into direct contact with the side portion of the filling material. Thereby, it can prevent that a water shielding sheet is damaged by the unevenness | corrugation of a filling material.

  Further, according to the present invention, in the above water storage structure, the corner type object has a three-forked shape, and the three-cornered corner type object arranged so as to cover a vertex portion of the block-shaped filling material. It is characterized by including.

  According to the said structure, the vertex part (intersection of three sides) which a filling material has can be covered with a simple construction procedure with a three-piece corner type thing. Thereby, the workability of the apex part of the block-shaped filling material can be improved.

  Further, in the water storage structure according to the present invention, the corner-shaped object has an L-shape in cross-section, and is disposed so as to cover at least a part of one side of the block-shaped filling material. It is characterized by including the L-shaped corner type thing.

  According to the said structure, the side part which a filling material has can be covered with a simple construction procedure. Thereby, the workability of the side part of the block-shaped filling material can be improved.

  Moreover, the present invention is characterized in that, in the water storage structure, the corner-type object has a flat shape at a portion in contact with the water shielding sheet.

  According to the above structure, when the filling material is covered with the water shielding sheet, the corner type object has a flat shape in contact with the water shielding sheet. Workability at the time of shifting or bending can be improved.

  It is possible to provide a water storage structure and a water storage method that can simplify the construction of the water storage tank, are less affected by the skill of the operator, and can reduce labor costs and the like.

It is explanatory drawing of the water storage structure which concerns on embodiment. It is explanatory drawing of the filling material which concerns on embodiment. It is explanatory drawing about laying of the impermeable sheet and protection sheet which concern on embodiment. It is explanatory drawing of the corner type thing which concerns on embodiment. It is explanatory drawing of the installation aspect of the filling material and corner type thing which concern on embodiment. It is a flow of the water storage construction method concerning an embodiment. It is explanatory drawing about joining of the water shielding sheet in a water storage construction method. It is explanatory drawing which concerns on the filling material assembly work in a water storage construction method. It is explanatory drawing which concerns on the side sheet | seat work in a water storage construction method. It is explanatory drawing which concerns on the backfill in a water storage construction method. It is explanatory drawing of the conventional water tank.

(Embodiment)
Hereinafter, the water storage structure and the water storage method in the underground water storage tank according to the present embodiment will be described with reference to the drawings.

(Water storage structure 1)
As shown in FIG. 1, the water storage structure 1 according to the embodiment protects the water blocking sheet 3, a block filling medium 2 having a gap shape capable of storing water, a water blocking sheet 3 covering the packing medium 2, and the water blocking sheet 3. A protective sheet 4 that is arranged, and a corner mold 5 that is disposed between the side portion and the apex portion of the filling material 2 and the water shielding sheet 3 and that covers the side portion 25 and the apex portion 26 of the filling material 2; Provided with a pipe through which water flows into the filling material 2, a pump mechanism that uses the water stored in the filling material 2, and a pipe that discharges when the water stored in the filling material 2 overflows Has been. And this water storage structure 1 is embed | buried in the ground, rain water is stored inside, and the rain water stored when needed is taken out and used.

(Inner filling material 2)
As shown in FIG. 2, the filling material 2 is a rectangular parallelepiped in which a large number of bent portions 23 (four in FIG. 2) are formed in parallel to form a large number of grooves 24 (three in FIG. 2). A large number of the block bodies 22 are stacked so that the directions of the bent portions 23 and the groove portions 24 are staggered (five in FIG. 2), thereby forming a hollow structure in which many gaps (voids) are secured.

  The block body 22 has a planar shape of 300 to 4000 mm, preferably 500 to 2000 mm square, and a thickness of about 100 to 500 mm. Moreover, as a material which comprises the block body 22, a polypropylene, polyethylene, a vinyl chloride resin, a polyethylene terephthalate etc. are mentioned, The polypropylene which is hard to corrode with water, is comparatively cheap, and is the lightest is preferable. The filling material 2 in which the block bodies 22 are stacked and stacked can secure a gap (void) of 80% or more, preferably 90% or more, and with respect to a load of 10 tf / m2 or more from above. It can endure.

  In addition, the shape of the filling material 2 is not limited to the one in which the block bodies 22 are stacked, but as described above, a block (a rectangular parallelepiped) that can secure a gap of 80% or more, preferably 90% or more. Any shape object may be used.

(Water shielding sheet 3)
Examples of the material constituting the water shielding sheet 3 include a vulcanized rubber, a thermoplastic elastomer, a polyethylene resin, an ethylene vinyl acetate resin, and a vinyl chloride resin, and a polyethylene resin that has high strength and excellent weather resistance. Is preferred. The water shielding sheet 3 preferably has a thickness in the range of 1.0 mm to 2.5 mm. The reason is that if the thickness of the water-impervious sheet 3 is less than 1.0 mm, the sheet may be easily broken due to insufficient strength, while if the thickness exceeds 2.5 mm, This is because the level difference is increased at the joint portion of the sheet 3 and the appearance is deteriorated.

(Protective sheet 4)
In the water storage structure 1 of the present embodiment, as shown in FIG. 3, a protective sheet 4 is laid on the base surface and side surfaces to prevent damage to the water shielding sheet 3. Examples of the material constituting the protective sheet 4 include polyester long fiber nonwoven fabrics, polyester short fiber nonwoven fabrics, or simple substances or composite materials such as natural fibers, synthetic fibers, and synthetic resins. The same high strength and weather resistance as the water shielding sheet 3 are used. Polyester long fiber nonwoven fabrics and polyester short fiber nonwoven fabrics are preferred. The thickness of the protective sheet 4 is preferably 4.0 mm or more. The water storage structure 1 is generally used in two layers, ie, the water shielding sheet 3 and the protective sheet 4, but the number of the water shielding sheet 3 and the protective sheet 4 is not particularly limited. 3 and the protection sheet 4 may overlap with each other.

(Corner type 5)
As shown in FIG. 4, the corner mold 5 is formed by processing a flat sheet and forming a three-pronged corner mold 51 and a flat sheet by bending the flat sheet into an L shape. There are two types, an L-shaped corner type object 52 having an L-shaped cross-sectional view.

  The three-cornered corner 51 has a flat shape in which the portion that contacts the filling material 2 and the portion that contacts the water-impervious sheet 3 have a flat shape, and the apex portion 26 (intersection of three sides) of the filling material 2. It is arranged so as to cover. That is, in the present embodiment, the trifurcated corner type object 51 is disposed at each of the eight apex portions 26 of the filling material 2. The dimensions of the trifurcated corner mold 51 are 30 to 60 mm in width c, 150 to 500 mm in width d, and 2 to 5 mm in thickness.

  The L-shaped corner 52 has a flat shape in which the portion that contacts the filling material 2 and the portion that contacts the water-impervious sheet 3 cover a part of the side portion 25 of the filling material 2. Placed in. In other words, in the present embodiment, the L-shaped corner type objects 52 are respectively disposed on the twelve side portions 25 of the filling material 2. Moreover, as a dimension of the L-shaped corner type | mold object 52, the width | variety a is 200-1200 mm, the width | variety b is 30-60 mm, and thickness is 2-5 mm.

  As a material constituting the trifurcated corner mold 51 and the L-shaped corner mold 52, the same material as that of the water shielding sheet 3 is used. That is, examples of the material constituting the trifurcated corner mold 51 and the L-shaped corner mold 52 include vulcanized rubber, thermoplastic elastomer, polyethylene resin, ethylene vinyl acetate resin, and vinyl chloride resin. A polyethylene resin system having high strength and excellent weather resistance is preferred.

  As shown in FIG. 5, the three-corner corner mold 51 and the L-shaped corner mold 52 are arranged on the side portion 25 and the apex portion 26 of the filling material 2, and the three-corner corner mold 51 and the L-shaped corner mold object. The water shielding sheet 3 is directly joined to 52.

  As a joining mode of the three-furnace corner type article 51 and the L-shaped corner type article 52 and the water shielding sheet 3, when the water shielding sheet 3 is a rubber type such as vulcanized rubber, an adhesive (for example, a butyl rubber type adhesive) ). Moreover, when the water shielding sheet 3 is a resin type, it joins by heat sealing | fusion.

(Water storage method)
Next, the water storage method according to the present embodiment will be described with reference to the flow of FIG.

(1: Preparation)
In constructing the above water storage structure 1 in the basement of the building or the basement of the park / parking lot, obstacles are removed and safety measures are taken.

(2: excavator)
The ground plane is dug into a rectangular shape.

(3: foundation work)
The bottom surface tamps the ground surface or forms a foundation flat part by concrete construction.

(4: Bottom sheet work)
In order to prevent damage to the water-impervious sheet 3, first, the protective sheet 4 is laid on the bottom surface so as not to be wrinkled, and then the water-impervious sheet 3 is laid. In addition, when the laying area of the impermeable sheet 3 is large, the impermeable sheets 3 are joined together. For example, as shown in FIG. 7, a primer is affixed to one of the water-impervious sheets 3, a joint tape is affixed to the other water-impervious sheet 3, the water-impervious sheets 3 are joined together, and the joined portion is rolled by a hand roller. Press.

(5: Filling material assembly work)
On the water-impervious sheet 3 laid on the bottom surface, a three-cornered corner type 51 and an L-shaped corner type are provided at positions where the lower side portion 25 and the apex portion 26 of the filling material 2 (block body 22) are installed. An object 52 is arranged. After that, a predetermined number of block bodies 22 are stacked on the arranged three-cornered corner 51 and L-shaped corner 52 so that the direction of the bent portions 23 and the grooves 24 are alternate, and the filling material 2 is formed. To do. When the filling material 2 is formed, the remaining three-pronged corner mold 51 and the L-shaped corner mold 52 are placed on the side portion 25 and the apex portion 26 of the filling material 2 (see FIG. 8). Finally, a spacer is fitted into the uppermost part of the filling material 2.

(6: Side sheet work)
As shown in FIG. 9, the water shielding sheet 3 laid on the bottom is joined to the three-cornered corner type 51 and the L-shaped corner type 52 attached to the side portion 25 and the apex portion 26 of the filling material 2, Lay on the side of the filling material 2 so as to wrap. As a method of joining the water shielding sheet 3 to the three-cornered corner type article 51 and the L-shaped corner type article 52, heat sealing is used when the water shielding sheet 3 is a resin type, and adhesive is used when the water shielding sheet 3 is a rubber type. To join. Subsequently, the protective sheet 4 is laid so as to wrap the outside of the water-impervious sheet 3 (note that the protective sheet 4 is not joined to the water-impervious sheet 3).

(7: Top sheet work)
A water-impervious sheet 3 or a water-permeable sheet (nonwoven fabric) is laid on the upper surface of the filling material 2 and joined to the water-impervious sheet 3 laid on the side surface of the filling material 2. This completes the part that becomes the water tank.

(8: Backfill)
In order to prevent movement due to earth pressure from the side and displacement of the water-impervious sheet 3 and the protective sheet 4, the soil is placed on the upper surface in a balanced manner instead of the weight, and the outer periphery is evenly distributed on all four sides to prevent the uneven load from acting in one direction. Then, as shown in FIG. 10, the upper part is backfilled to a predetermined height. Thereby, the said water storage structure 1 can be constructed in the basement of a building, the basement of a park, a parking lot, etc.

(effect)
According to the water storage method and the water storage structure 1 described above, by placing the corner type object 5 having a shape covering the side portion 25 etc. on the side portion 25 etc. of the inside filling material 2 having irregularities by the gaps, the intermediate filling material 2 When the water shielding sheet 3 is covered, the water shielding sheet 3 is prevented from being caught by the side portions 25 of the filling material 2 having irregularities, and the filling material 2 (block body 22) is prevented from shifting. be able to. This improves the workability of the side portions 25 of the block-shaped filling material 2 and the like, the formation of the water tank is simpler, the workmanship is less affected by the skill level of the operator, and personnel costs, etc. Cost can be reduced.

  Moreover, according to the said water storage construction method and the water storage structure 1, the vertex part 26 (intersection of three sides) which the filling material 2 has can be covered with the trifurcated corner type | mold object 51 with a simple construction procedure. Thereby, the workability of the apex portion 26 of the block-shaped filling material 2 can be improved.

  Moreover, according to the said water storage construction method and the water storage structure 1, the side part 25 which the filling material 2 has can be covered with a simple construction procedure. Thereby, the workability of the side portion 25 of the block-shaped filling material 2 can be improved.

  Moreover, according to the water storage method and the water storage structure 1, when the filling material 2 is covered with the water shielding sheet 3, the corner mold 5 has a flat shape in contact with the water shielding sheet 3, The workability at the time of shifting or bending the water shielding sheet 3 at the side portion 25 and the apex portion 26 of the filling material 2 can be improved.

DESCRIPTION OF SYMBOLS 1 Water storage structure 2 Filling material 22 Block body 23 Bending part 24 Groove part 25 Side part 26 Apex part 3 Water shielding sheet 4 Protective sheet 5 Corner type | mold 51 Trident corner type | mold 52 L-shaped corner type article

Claims (6)

A water storage method for forming a water storage tank by covering a block-shaped filling material having a gap capable of storing water with a water shielding sheet,
In the side part of the filling material, a shape that covers the side part , and a part in contact with the water-impervious sheet has a flat shape, a corner type object is disposed,
When covering the filling material in which the corner mold is disposed with the water shielding sheet , the corner mold and the water shielding sheet are bonded by bonding or heat fusion,
Furthermore, when installing so that the outer side of the said water shielding sheet may be wrapped with a protective sheet, the said protective sheet and the said water shielding sheet are not joined, The water storage method characterized by the above-mentioned .   The said corner type thing has a three-pronged shape, The three-cornered corner type thing arrange | positioned so that the vertex part which the said block-shaped filling material has may be included. Water storage method.   The corner-shaped object has an L-shape in cross-sectional view, and includes an L-shaped corner-shaped object disposed so as to cover at least a part of one side of the block-shaped filling material. The water storage method according to claim 1 or 2. A block-shaped filling material having a gap capable of storing water;
A water shielding sheet covering the filling material;
A corner disposed between the side portion of the filling material and the water shielding sheet, having a shape covering the side portion of the filling material , and a portion in contact with the water shielding sheet having a flat shape. Mold and
A protective sheet that wraps around the outside of the water shielding sheet;
With
The corner type article and the water shielding sheet are joined by adhesion or heat fusion,
The water storage structure, wherein the water shielding sheet and the protective sheet are not joined . The corner type product has a trifurcated shape, according to claim 4, characterized in that it comprises a three-pronged corner type material disposed to cover the apex portion having the filling material in that the block-shaped Water storage structure. The corner-shaped object has an L-shape in cross-sectional view, and includes an L-shaped corner-shaped object disposed so as to cover at least a part of one side of the block-shaped filling material. The water storage structure according to claim 4 or 5 .

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