JP2009270319A - Execution structure of yard catch basin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an execution structure of a yard catch basin which can allow rainwater flowing into a yard catch basin to penetrate deeply into the ground. <P>SOLUTION: The execution structure of a yard catch basin comprises a through-hole 2a formed in a bottom plate portion 2 of the yard catch basin 1, and a hollow or columnar drain material 21 which is inserted into the through-hole 2a at its upper end, has a full length of at least 40 cm or more, and has water permeability to allow the rainwater flowing into the yard catch basin 1 to penetrate into the ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction structure for a rainwater tank in which rainwater flows into the interior, and more particularly to a construction structure for a rainwater tank that can infiltrate rainwater into the ground.

The original surface was formed by earth, and rainwater penetrated into the ground, and part of it temporarily flowed into rivers and lakes. In order to prevent flooding of paved roads, etc., rainwater tanks that collect rainwater are installed on paved roads and facilities, and rainwater mains and sewage pipes are drained from these rainwater tanks via drainage pipes. The water was sent to etc. and drained. However, in this construction structure, since rainwater does not penetrate into the ground, groundwater flowing into rivers, etc. is reduced, causing water pollution due to deterioration in purification capacity, and groundwater sources and trees used for beverages, etc. It was a cause of depletion of makeup water. As measures against these, a construction structure of a rainwater basin for the purpose of infiltrating the rainwater flowing into the rainwater basin into the ground has been proposed (see Patent Document 1). In the rainwater tank construction structure disclosed in Patent Document 1, a through hole is formed in the bottom plate portion of the rainwater tank in addition to the drain pipe disposed on the side wall, and a hole through which water can flow is formed below the through hole. The filter material (drain material) which it has is arrange | positioned, and the rain water which flowed in into the rain water trough through this drain material osmose | permeates in the ground.
Japanese Patent No. 3932053

  However, in the construction structure of the conventional rainwater tank disclosed in Patent Document 1, the drain material penetrates the bottom plate portion of the rainwater tank and is buried in the ground below the drainwater tank. When an impermeable layer such as a clay layer exists, rainwater that has flowed into the rainwater basin penetrates from the ground surface to the impermeable layer, but rainwater is present in the stratum below the impermeable layer. It does not penetrate. For this reason, when there is an impermeable layer near the surface of the earth, rainwater does not penetrate deeply into the ground, so the penetration rate decreases, groundwater flowing into rivers, etc. decreases, causing water pollution. The water supply to the groundwater source used for beverages, etc.

  Therefore, the present invention is proposed in order to solve the problems of the above-described conventional invention, and provides a construction structure for a rainwater tank that can penetrate deeply into the ground. It is intended to do.

  The present invention has been proposed in order to solve the above-described problems. The first invention (the invention according to claim 1) includes a through-hole formed in a bottom plate portion of a rainwater tank, and the through-hole. A hollow or column-shaped drain material having water permeability so that the rainwater flowing into the rainwater basin penetrates into the ground. It is characterized by.

  According to the first aspect of the invention, since the drain material has a length of 40 cm or more, even if an impermeable layer such as a clay layer is formed in the lower layer in which the rainwater tank is buried, this impermeable layer Construction structure of rainwater ridge with high permeability by burying drainage material in the water permeable layer such as sandy soil layer formed below it and allowing rainwater flowing into the rainwater basin to penetrate deep into the ground Can be configured. For this reason, even when there is an impermeable layer near the surface of the earth, rainwater penetrates deeply into the ground, improving the penetration rate of rainwater, preventing water pollution due to the decrease in groundwater flowing into rivers, etc. It is possible to prevent the supply water to the groundwater source used for trees and beverages from being depleted.

  The drain material constituting the present invention has a hollow shape or a column shape, and its material, shape, structure, dimensions, etc. are particularly limited as long as it has water permeability through which rainwater in the rainwater trough can pass. In addition, known drain pipes that have been used so far can be used. The material of the drain material may be a synthetic resin such as vinyl chloride, polyethylene, polyethylene terephthalate, a metal such as iron, copper, or aluminum, and concrete, cement, glass, ceramic, etc. FRP pipes and laminated pipes made of a plurality of materials may be used as the drain material. Further, the shape of the drain material is preferably a circular cross section, but depending on the purpose of use and required performance, for example, a cross sectional shape other than a circular shape, such as a rectangular one, an ellipse, an oval, etc. It may have.

  Further, in order to impart water permeability to the drain material, in addition to using a material having water permeability in the material itself, a hole for water passage or water permeability is formed during or after the production of the drain material. Also good. For example, a porous material such as a synthetic resin continuous foam or a foamed ceramic has water permeability, and a drain material may be formed using such a material (raw material). In addition, if the particulate material, fiber material, or wire material is accumulated and integrated together with a certain gap, the resulting molded body has water permeability. It can also be used. Alternatively, a combination of wire materials in a net shape can be formed into a cylindrical shape to form a drain material. Furthermore, this drain material can be made by attaching a net cloth-like material to a frame assembled with a bar material to ensure tube strength and water permeability. In addition, a large number of small holes can be made with a drill or the like to impart water permeability. Or the drain material which shape | molded the punching metal in the cylinder shape can also be used. In addition, it is desirable for the water flow space which the drain material which comprises this invention has even water permeability, but it is hard for sediment and the like to flow in. Moreover, although the construction full length of the drain material embed | buried in the ground can also be constructed only with one drain material, it can also be used by adding several short drain materials. If a required number of drainage materials with a fixed length are added, a wide range of construction conditions can be accommodated. That is, if the length of the drain material is 40 cm, it often reaches below the impermeable layer, and if it does not reach below the impermeable layer, is a long single drain material used? Alternatively, a plurality of drain materials may be used, and the maximum length of the drain material depends on the state of the formation where the drain material is constructed, but if it is about 2 m long, it may exceed the impermeable layer. Many.

  Further, according to a second invention (invention of claim 2), in the first invention, the drain material is wrapped by a cloth-like covering member, and at least the upper end is a cap having water permeability. It is characterized by being mounted.

  According to the second aspect of the invention, since the drain material is wrapped by the cloth-like covering member, the draining material may be clogged by the covering member even if earth or sand flows into the rainwater basket. It is alleviated and it is not necessary to remove soil and the like accumulated in the drain material, and rainwater can be penetrated deep into the ground for a long period of time. Furthermore, since the cap is attached, it is possible to effectively prevent clogging of the upper end portion of the drain material and hindering the permeability of rainwater due to peeling or dropping of the covering member. The material of the covering member is not particularly limited, and can be selected from woven or non-woven fabrics such as plant fibers, animal fibers, and resin fibers.

  Further, a third invention (the invention according to claim 3) is the above-mentioned first or second invention, wherein the rain water tank has a space in the whole or a part of the inner wall of the rain water tank. The drain plate member is provided with a first filter member having water permeability including a vertical plate portion and a horizontal plate portion which has a space from the lower end of the vertical plate portion to the bottom plate portion of the rainwater basket and is opposed thereto. The upper end of is located below the horizontal plate part which comprises the said 1st filter member, It is characterized by the above-mentioned.

  According to the third aspect of the invention, since there is a space between the first filter member and the inner wall or bottom plate portion of the rainwater tank, earth and sand etc. flow into the rainwater tank and above the drain material. Even if soil or the like is deposited on the drain, it is possible to prevent the drain from being clogged. That is, even if earth or sand flows into the rainwater basin, the earth and sand accumulates on the lateral plate portion having water permeability without directly flowing into the drain material. From the space between the upper part of the vertical plate part that has not been deposited and the inner wall of the rainwater tank to the drain material through the space between the horizontal plate part and the bottom plate part of the rainwater tank, Rainwater can penetrate deep into the ground over a long period of time without preventing rainwater from flowing into the drain material.

  Therefore, according to the present invention, it is not necessary to frequently remove the earth and sand in the rainwater tank as in the conventional rainwater tank construction structure, and the work of cleaning and replacing the drain material can be reduced. In particular, when the length of the vertical plate portion is formed up to the vicinity of the upper end of the rainwater basin, it is possible to increase the allowable amount of sediment such as sediment deposited in the rainwater basin. Can be reduced. Further, when the first filter member is formed in a bowl shape with an upper end opening, the accumulated earth and sand can be taken out of the rainwater tank while being retained in the bowl-shaped first filter member. Therefore, even when an operation for removing earth and sand accumulated in the rainwater basket is generated, it is not necessary to bend greatly, and it is possible to perform the operation easily and quickly.

  According to a fourth invention (invention according to claim 4), in the third invention, between the vertical plate part constituting the first filter member and the inner wall of the rainwater tank and / or the first A water-permeable second filter member is disposed between the horizontal plate portion constituting the filter member and the bottom plate portion of the rainwater tank.

  According to the fourth aspect of the present invention, the second filter member having water permeability is disposed between the first filter member and the rainwater tank, so that the rainwater flowing into the rainwater tank is Since the first filter member does not flow directly into the drain material, but passes through the second filter member, the drain material passes through the drain material. Accordingly, it is not necessary to remove the earth and sand accumulated in the drain material, and rainwater can be penetrated deep into the ground for a long period of time.

  Note that the second filter member according to the present invention has at least an L shape, and the material, shape, structure, dimensions, and the like thereof are particularly limited as long as the second filter member has water permeability through which rainwater in the rainwater trough can pass. Is not to be done. Moreover, what is necessary is just to select from the raw material similar to the said drain material as a raw material of this 2nd filter member. The shape of the second filter member is at least L-shaped with a vertical filter portion corresponding to the vertical plate portion of the first filter member and a horizontal filter portion corresponding to the horizontal plate portion. However, it is preferable that the vertical filter portion correspond to the plurality of inner walls of the rainwater tank because the water permeability of the vertical filter portion is increased. Further, in order to impart water permeability to the second filter member, in addition to using a material having water permeability in the material itself as in the case of the drain material, water is passed during or after the production of the second filter member. Or a hole for water permeability or the like may be formed.

  According to a fifth invention (invention according to claim 5), in the fourth invention, the second filter member is wrapped with a cloth-like covering member.

  According to the fifth invention, since the second filter member is wrapped by the cloth-like covering member, even if earth or sand flows into the rainwater basket, the second filter member is formed by the covering member. Occurrence of clogging is alleviated, and it is not necessary to remove soil and the like accumulated in the second filter member, and rainwater can penetrate deeply into the ground for a long period of time. The material of the covering member is not particularly limited, and can be selected from woven or non-woven fabrics such as plant fibers, animal fibers, and resin fibers.

  In the first invention (the invention described in claim 1), since the drain material has a length of 40 cm or more, even if an impermeable layer such as a clay layer is formed in the lower layer in which the rainwater tank is embedded. By burying drainage material through this impermeable layer, rainwater penetrates deeply into the ground, improving the penetration rate of rainwater, preventing water pollution due to the decrease in groundwater flowing into rivers, etc. It is possible to prevent the supply water to the groundwater source used for beverages and the like from being depleted. That is, it is possible to prevent deterioration of the natural environment due to pavement and to improve it.

  In the second invention (the invention described in claim 2), since the drain material is wrapped by a cloth-like covering member, even if earth or sand flows into the rainwater basin, the draining member is made into a drain material by the covering member. Clogging is alleviated, maintenance work can be reduced by eliminating the need to remove dirt and other material accumulated inside the drain material, and rainwater can be brought deep into the ground for a long period of time. Since it can be permeated, the quality can be improved. In addition, since the cap is attached, the covering member peels off or falls off, so that the upper end of the drain material is clogged, effectively preventing the rainwater permeability from being obstructed and improving quality. Can be achieved.

  In the third invention (the invention described in claim 3), since there is a space between the first filter member and the inner wall or bottom plate portion of the rainwater tank, earth and sand etc. are present in the rainwater tank. Even if earth and sand etc. are deposited on the drain material after flowing in, the drain can be prevented from being blocked. That is, even if earth or sand flows into the rainwater basin, the earth and sand accumulates on the lateral plate portion having water permeability without directly flowing into the drain material. From the space between the upper part of the vertical plate part that has not been deposited and the inner wall of the rainwater tank to the drain material through the space between the horizontal plate part and the bottom plate part of the rainwater tank, Rainwater can penetrate deep into the ground over a long period of time without preventing rainwater from flowing into the drain material. Therefore, it is not necessary to frequently remove soil and sand in the rainwater tank as in the case of the conventional rainwater tank construction structure, and the maintenance cost can be reduced because the cleaning and replacement work of the drain material can be reduced. .

  In the fourth invention (the invention described in claim 4), according to the fourth invention, a second filter member having water permeability is disposed between the first filter member and the rainwater tank. As a result, the rainwater that has flowed into the rainwater tank does not flow directly into the drain material from the first filter member, but flows into the drain material through the second filter member. Even if soil or the like flows in, the sediment does not accumulate on the drain material, eliminating the need to remove the sediment or the like accumulated inside the drain material, reducing maintenance costs, and extending over a long period of time. Rainwater can penetrate deep into the ground.

  In the fifth invention (the invention described in claim 5), according to the fifth invention, the second filter member is wrapped by a cloth-shaped covering member, so that it is in a rainwater basket. The clogging of the second filter member due to the covering member is alleviated even when the earth and sand flows in, and the work for removing the earth and sand accumulated in the second filter member is not required, thereby reducing the maintenance cost. In addition to being able to do so, rainwater can penetrate deep into the ground for a long period of time.

  Hereinafter, a construction structure of a rainwater tank according to an embodiment of the present invention will be described in detail with reference to the drawings. First, the construction structure of the rainwater tank according to the first embodiment will be described in detail.

  As shown in FIG. 1 or FIG. 3, the construction structure of the rainwater tank according to the first embodiment includes a rainwater tank 1 embedded in the ground and collecting rainwater, and the rainwater tank 1 disposed in the rainwater tank 1 The filter body 11 constituted by the first filter member 12 and the second filter member 15 that filter and pass rainwater in the rainwater tank 1 and the bottom plate portion 2 of the rainwater tank 1 are inserted into the ground. A drain material 21 that is further embedded in the rainwater filtered through the filter body 11 and passes through the ground, a cap 25 that protects the lower end of the drain material 21, and the rainwater in the rainwater tank 1 A drain pipe 27 that supplies water to a rainwater main pipe, a sewer pipe, and the like, and an upper lid 28 that covers the upper end of the rainwater tank 1 are configured.

  As shown in FIG. 1 or 2, the rainwater basket 1 is formed into an integral bowl shape that stores rainwater from the bottom plate portion 2 and the side plate portions 3, 4, 5, 6 using concrete as a raw material, A through hole 2a through which a drain material 21 (to be described later) can be inserted is formed in a substantially central portion of the bottom plate portion 2, and a drain hole 6a into which a drain pipe 27 (to be described later) is inserted is formed in a substantially central portion of the side plate portion 6. On the inner side of the upper ends of the side plate portions 3, 4, 5 and 6, an annular projecting portion 7 is provided so as to form an opening 7a for inserting an upper lid 28 to be described later and a receiving portion 7b for placing the upper lid 28. Yes. Further, the upper lid 28 is formed in a rectangular plate shape that can be inserted into the opening 7a of the rainwater trough 1 using a metal as a raw material, and has a large number of water passage holes 28a through which rainwater flowing from the upper surface of the pavement portion K flows. Yes. The drainage pipe 27 is formed into a pipe shape having a drainage hole 27a made of metal, resin, or the like. One end of the drainage pipe 27 is inserted into the drainage hole 6a of the rainwater trough 1, and the other end is a rainwater book (not shown). It is connected to pipes and sewer pipes. When rainwater that has flowed into the rainwater trough 1 from the water passage hole 28a of the upper lid 28 reaches the drainage hole 27a of the drainage pipe 27, the rainwater passes through the drainage hole 27a, and the rainwater main, sewage pipe, etc. To be drained.

  As shown in FIGS. 1, 2, or 3, the filter body 11 disposed in the rainwater trough 1 is composed of a first filter member 12 and a second filter member 15, and one first filter member. 12 is a horizontal plate portion 13 facing the bottom plate portion 2 of the rainwater tank 1 with a space, and a vertical plate standing on the horizontal plate portion 13 and facing the side plate portion 3 of the rainwater tank 1 with a space. It consists of a plate part 14 and is molded into an integral L-shape with ABS resin. The horizontal plate portion 13 and the vertical plate portion 14 are formed with a large number of water passage holes 13a and 14a through which sediment and foreign matter in the rainwater trough 1 are filtered to allow rainwater to pass therethrough. The material of the first filter member 12 is not limited to the ABS resin, and may be formed of other resin, metal, or the like. In the first filter member 12, there is a space between the first filter member 12 and the bottom plate portion 2 and the side plate portion 3 of the rainwater trough 1. Or the like, and even if sediment or the like accumulates above the lateral filter portion 16 or the drain material 21 of the second filter member 15 described later, it is possible to prevent the lateral filter portion 16 or the drain material 21 from being blocked. it can. That is, even if earth or sand flows into the rainwater tank 1, the earth or sand accumulates on the horizontal plate part 13 having the water passage holes 13 a without directly flowing into the horizontal filter part 16. The rainwater flows from the upper part of the water passage hole 14a formed in the vertical plate part 14 where sediment or the like is not deposited, through the vertical filter part 18 of the second filter member 15 to the drain material 21 described later. The rainwater can be permeated deeply into the ground for a long period of time without the inflow of the rainwater into the second filter member 15 or the drain material 21 due to earth or sand.

  In addition, the path | route of the rainwater flowed from this 1st filter member 12 is the water flow of the horizontal plate part 13, when the rainwater collected in the rainwater trough 1 has not reached the horizontal plate part 13. Water is passed through the hole 13a through the covering member 17 of the second filter member 15, which will be described later, to the horizontal filter portion 16. Further, when rainwater reaches above the horizontal plate portion 13, the water passes through the water passage hole 13 a of the horizontal plate portion 13 through the covering material 17 to the horizontal filter portion 16, and the water flow of the vertical plate portion 14. Water is passed from the hole 14a through the covering material 19 to the vertical filter unit 18. Further, when sediment or the like is accumulated on the horizontal plate portion 13, the water is passed from the water passage hole 14 a of the vertical plate portion 14 to the vertical filter portion 18 through the covering material 19. In addition, the configuration of the vertical plate portion 14 is not limited to the configuration facing the side plate portion 3, as long as it faces any one of the side plate portions 3, 4, 5, 6, and a plurality of Configuration facing the side plate portion (in the case where the vertical plate portion 14 is configured to face all the side plate portions 3, 4, 5, 6), the first filter member 12 is formed in a bowl shape with an upper end opening. It may be. In addition, when the first filter member 12 is formed in a bowl shape with an upper end opening, when an operation for removing the earth and sand accumulated in the rainwater basket 1 occurs, the accumulated earth and sand is removed in the bowl-shaped first shape. Since it can be taken out of the rainwater tank 1 while being held in the filter member 12 of 1, it is not necessary to bend greatly, and it is possible to work easily and quickly.

  Further, the other second filter member 15 constituting the filter body 11 includes a horizontal plate portion 13 constituting the first filter member 12 and a bottom plate of the rainwater tank 1 as shown in FIGS. The horizontal filter unit 16 sandwiched between the unit 2, the covering material 17 covering the horizontal filter unit 16 and the upper surface of the horizontal filter unit 16, and the first filter member 12. The vertical filter portion 18 sandwiched between the vertical plate portion 14 and the side plate portion 3 of the rainwater tank 1 and the covering material 19 covering the vertical filter portion 18 so as to wrap the vertical filter portion 18. Among these, as shown in FIG. 1 (b), the horizontal filter portion 16 has a large number of mesh portions 16a made of polyethylene as a circular cross section and arranged adjacent to each other. Has a large number of connecting portions 16b in which adjacent mesh portions 16a are connected to each other, and in the space of the portion excluding each mesh portion 16a and each connecting portion 16b, soil and sand are filtered out to pass rainwater. A large number of possible water passage holes 16c are formed and formed into a plate shape having water permeability as a whole. The covering material 17 that covers the lateral filter portion 16 so as to wrap is a sheet made of a nonwoven fabric having a large number of water passage gaps (reference numerals are omitted) that are finer than the water passage holes 16c of the horizontal filter portion 16 and are capable of passing water. In this way, the entire outer periphery of the horizontal filter portion 16 is covered over a plurality of layers and an end portion (not shown) is bonded.

  The other vertical filter unit 18 is the same as the horizontal filter unit 16, and as shown in FIG. 1B, a large number of mesh portions 18a made of polyethylene are connected to the mesh portions 18a. It consists of a large number of the connecting portions 18b and a large number of water passage holes 18c through which dirt and sand and foreign matter can be filtered to allow rainwater to flow, and is formed into a plate shape having water permeability as a whole. The covering material 19 that covers the vertical filter portion 18 so as to wrap the sheet is made of a non-woven fabric having a large number of water passage gaps (reference numerals are omitted) that are finer than the water passage holes 18c of the vertical filter portion 18 and allow water to pass therethrough. The entire outer periphery of the vertical filter portion 18 is covered over a plurality of layers and an end portion (not shown) is bonded. In addition, the said horizontal filter part 16 and the vertical filter part 18 may be shape | molded by integral L shape.

  And in this 2nd filter member 15, since it has a water-permeability arrangement | positioning between the said 1st filter member 12 and the rain water tank 1, the rain water which flowed into the rain water tank 1 is said 1st. Without directly flowing from the first filter member 12 into the drain material 21 to be described later, the second filter member 15 is further filtered through the water passage gaps (reference numerals are omitted) and the many water passage holes 16c and 18c. Since water is passed through the drain material 21, even if earth or sand flows into the rainwater trough 1, earth or sand is not deposited on the drain material 21. In addition, the raw material of the horizontal filter part 16 and the vertical filter part 18 which comprises the 2nd filter member 15 is not limited to the said polyethylene, You may shape | mold with other resin, a metal, etc. The shape of the second filter member 15 is at least L-shaped, comprising a vertical filter portion 18 corresponding to the vertical plate portion 14 of the first filter member 12 and a horizontal filter portion 16 corresponding to the horizontal plate portion 13. Although having a shape, water permeability can be increased by configuring the vertical filter portion 18 so as to correspond to the plurality of inner walls of the rainwater tank 1.

  Further, as shown in FIG. 1, the drain material 21 inserted through the bottom plate portion 2 of the rainwater basket 1 includes a drain body 22 and a covering material 23 that covers the drain body 22 so as to wrap the rainwater tank 1. The upper end is substantially flush with the upper surface of the bottom plate portion 2 of the rainwater trough 1 and the lower portion thereof is buried in the ground through the through hole 2a formed in the bottom plate portion 2. Among these, as shown in FIG.1 (c), the drain main body 22 is arrange | positioned adjacent to the net | network part 22a formed in the cross-sectional circle shape using polyethylene as a raw material, In the fixed space | interval position of these net | network parts 22a, In addition to having a large number of connecting portions 22b in which adjacent net portions 22a are connected to each other, it is possible to pass rainwater by filtering earth and sand and foreign matter in the space of the portion excluding each net portion 22a and each connecting portion 22b. Many water passage holes 22c are formed, and the overall cylindrical length is formed to be 40 cm or more. The shape of the drain main body 22 is not limited to a cylindrical shape, and may be a columnar shape. Further, the other covering material 23 is formed in a sheet shape from a nonwoven fabric having a large number of water passage gaps (reference numerals are omitted) that are finer than the water passage holes 22c of the drain main body 22 and are capable of water passage. The entire outer periphery of the drain body 22 is covered so as to be wrapped over a plurality of layers, and the end 23a is bonded (see FIG. 5).

  And since this drain material 21 has 40 cm or more in length, as shown in FIG. 1, impermeable layers, such as a clay layer, are formed in the lower layer M in which the rain gutter 1 was embedded. However, by passing through this impermeable layer and burying the drain material 21 in the formation N which is a permeable layer such as a sandy soil layer formed in the lower layer, water is passed from the second filter member 15. The rainwater thus filtered is further filtered through the water passage hole 22c of the drain main body 22 constituting the drain member 21 and the water passage gap of the covering member 23 to penetrate deeply into the ground. Therefore, it is preferable to make the total length of the drain material 21 as long as possible. In addition, as for the form of the full length of this drain material 21, although one full length may be shape | molded by 40 cm or more, even if one full length is shorter than 40 cm, if it is comprised by more than 40 cm by multiple pieces good. And what is necessary is just to set the full length of the drain material 21 embed | buried in the ground to the length corresponding to the depth of the burial hole H to be constructed. Moreover, the joint part in the case of comprising a plurality of drain members 21 may be adhered or simply brought into contact.

  Further, as shown in FIG. 1 (c), the cap 25 attached to the lower end portion of the drain material 21 has a mesh portion 25a formed in a circular cross section made of polyethylene as a raw material, and these mesh portions are arranged adjacent to each other. 25a has a large number of connecting portions 25b in which adjacent mesh portions 25a are connected to each other, and in the space of the portion excluding each mesh portion 25a and each connecting portion 25b, dirt and foreign matters are filtered. Thus, a large number of water passage holes 25c through which rainwater can be passed are formed, and are formed into a cup shape as a whole. And in this cap 25, the rain water passed from the said drain material 21 osmose | permeates in the ground through the water flow hole 25c. In addition to the cap 25, a cap 24 shown in FIG. 5 may be attached to the drain material 21 at the upper end of the drain material 21. The cap 24 is formed with a net portion, a connecting portion, and a space of a portion excluding each net portion and each connecting portion, but since it has the same configuration as the cap 25, a detailed description thereof is omitted. The cap 24 or 25 protects the upper end or the lower end of the drain material 21 when the drain material 21 is embedded in the embedded hole H excavated in the ground. Absent.

  And the construction structure of the rainwater tank concerning the said 1st Embodiment can be constructed even if the rainwater tank 1 is either an existing installation or a new installation. For example, in the case where the rain gutter 1 shown in FIG. 1 is already embedded in the formation L, first, a drain material 21 can be inserted through the bottom plate portion 2 of the existing rain gutter 1 with a concrete drilling tool (not shown). A hole 2a is formed, and a buried hole H having a depth in which the drain material 21 and the cap 25 can be buried is excavated in the ground below the through hole 2a. After the buried hole H is excavated, the drain material 21 and the cap 25 are inserted through the through hole 2a of the bottom plate portion 2, and the upper end of the drain material 21 is substantially flush with the upper surface of the bottom plate portion 2 of the rainwater tank 1. The drain material 21 and the cap 25 are buried in the embedding hole H so as to be. Then, after the drain material 21 and the cap 25 are buried in the ground, the horizontal filter portion 16 covered with the covering material 17 is placed on the bottom plate portion 2 in the rainwater trough 1 shown in FIG. The vertical filter portion 18 covered with the covering material 19 is placed on the upper surface of the horizontal filter portion 16 at a position where it comes into contact with the inner surface of the side plate portion 3 of the rain gutter 1. After the first filter member 12 is placed so as to be inscribed in the vertical filter portion 18, the upper lid 28 is placed on the receiving portion 7 b of the rainwater tank 1. As a result, the construction structure of the rainwater tank according to the first embodiment is configured.

  The diameter of the through hole 2a formed in the bottom plate portion 2 can be inserted as long as the diameter at which the drain material 21 can be inserted is formed because the cap 25 portion on the lower end side can be compressed in the diameter direction. Moreover, the depth of the embedding hole H which embeds the drain material 21 changes with the form of the formation, for example, when the formation M below the formation L is an impermeable layer such as a clay layer, rainwater is not permeated. Therefore, it is preferable that the depth N from the upper layer portion of the formation N to the lower end of the cap 25 is excavated to a depth of at least about 30 cm while reaching the formation N which is a permeable layer such as a sandy soil layer below. . In addition, the length of the drain material 21 may be formed so that one full length is 40 cm or more, but even if one full length is shorter than 40 cm, a plurality of drain materials 21 may be configured to be 40 cm or more. good. And what is necessary is just to set the full length of the drain material 21 embed | buried in the ground to the length corresponding to the depth of the burial hole H to be constructed. Moreover, the joint part in the case of comprising a plurality of drain members 21 may be adhered or simply brought into contact. Further, the filter body 11 in the first embodiment can be configured by disposing only the first filter member 12 in the rainwater trough 1. In this case, since it is necessary to have a space between the horizontal plate portion 13 and the vertical plate portion 14 constituting the first filter member 12 and the inner wall of the rainwater trough 1, the horizontal plate portion 13 The support | pillar (spacer) for forming the said space between some board | plates and the bottom-plate part 2 of the rainwater basket 1 and between some vertical-plate parts 14 and the side-plate part 3 of the rainwater basket 1 is required. .

  Next, the effect | action of the construction structure of the rain water tank concerning the said 1st Embodiment is demonstrated. In FIG. 1, rainwater due to rain is collected in the rainwater tank 1 from the upper surface of the pavement K through the water passage hole 28 a of the upper lid 28, and the horizontal plate constituting the first filter member 12 in the rainwater tank 1. Water is passed through the drain material 21 through the water passage hole 13 a of the portion 13, the water passage gap (not shown) of the covering material 17 constituting the second filter member 15, and the water passage hole 16 c of the horizontal filter portion 16. . The rainwater that has flowed through the drain material 21 includes a water flow hole 22 c below the drain body 22 that constitutes the drain material 21, a water flow gap (not shown) in the covering material 23, and a water flow hole in the cap 25. It penetrates into the formation N which is a water permeable layer through 25c. Further, when rainwater accumulates in the drain main body 22 due to an increase in rainfall or the like, the formation is a permeable layer through the water passage hole 22c above the drain main body 22 and the water gap between the covering material 23. N or the formation L is infiltrated. Further, when rainwater in the rainwater trough 1 reaches above the horizontal plate portion 13, the water passage hole 14 a of the other vertical plate portion 14 constituting the first filter member 12, the second filter The water passage gap of the other covering material 19 constituting the member 15 (the reference numeral is omitted) and the water passage hole 18 c of the vertical filter portion 18, the water passage gap of the covering material 17 below and the horizontal filter portion 16. Water is passed into the drain main body 22 from the water passage hole 16c and penetrates into the formation N or the formation L as described above. If the rainwater in the rainwater trough 1 further increases and reaches the drainage hole 27a of the drainage pipe 27, the rainwater that has reached the drainage hole 27a passes from the drainage hole 27a to the rainwater main pipe (not shown) It is prevented from being drained into a water pipe or the like and overflowing from the rainwater tank 1.

  And since the 1st filter member 12 is arrange | positioned through the 2nd filter member 15 in the rain water tank 1, earth and sand etc. flow in into the rain water tank 1, and the side of the 2nd filter member 15 is shown. Even if soil or the like accumulates above the filter unit 16 or the drain material 21, the lateral filter unit 16 or the drain material 21 can be prevented from being blocked. That is, even if earth or sand flows into the rainwater trough 1, the earth or sand does not flow directly into the horizontal filter part 16, but on the horizontal plate part 13 of the first filter member 12 having the water passage holes 13 a. The accumulated rainwater in the rainfed basin 1 passes from the upper part of the water passage hole 14a formed in the vertical plate part 14 of the first filter member 12 where sediment or the like is not deposited, to the vertical filter part of the second filter member 15. Since the water is passed through the drain material 21 via 18, the inflow of rainwater to the second filter member 15 and the drain material 21 is not blocked by earth or sand.

  Moreover, since the 2nd filter member 15 is arrange | positioned between the 1st filter member 12 and the baseplate part 2 and the side-plate part 3 of the rainwater basket 1, the rainwater collected in the rainwater tank 1 is In addition, fine earth and sand and foreign matters are filtered through the fine water passage gaps of the covering material 17 and / or the covering material 19 of the second filter member 15 and are passed through the horizontal filter portion 16 and / or the vertical filter portion 18 to be horizontally It is possible to prevent clogging and accumulation of earth and sand and foreign matter in the water passage hole 16c of the filter portion 16, the water passage hole 18c of the vertical filter portion 18, and the water passage hole 22c of the drain body 22. Further, since the length of the drain material 21 is 40 cm or more, as shown in FIG. 1, even if an impermeable layer such as a clay layer is formed in the lower layer M in which the rainwater tank 1 is embedded. The rainwater passed through the second filter member 15 by passing through the impermeable layer and burying the drain material 21 in the formation N which is a permeable layer such as a sandy soil layer formed below the impermeable layer Is further filtered by the drain material 21 and penetrated deep into the ground.

  Next, the construction structure of the rainwater tank according to the second embodiment will be described. As shown in FIG. 4, the construction structure of the rainwater tank according to the second embodiment is inserted into a rainwater tank 1 that is buried in the ground and collects rainwater, and a bottom plate portion 2 of the rainwater tank 1. In addition, a drain material 21 buried in the ground and allowing rainwater to flow into the ground, caps 24 and 25 protecting the upper and lower ends of the drain material 21, and the rainwater in the rainwater basin 1, A drain pipe 27 for feeding water to a sewer pipe and the like, and an upper lid 28 covering the upper end portion of the rainwater tank 1 are configured. The rainwater tank construction structure according to the second embodiment is the first filter of the filter body 11 constituting the rainwater tank construction structure according to the first embodiment shown in FIGS. Since the member 12 and the second filter member 15 are not disposed and only the installation position of the drain material 21 is different, common constituent elements are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 4, the drain member 21 inserted through the bottom plate portion 2 of the rainwater basket 1 includes a drain main body 22 and a covering material 23 that covers the drain main body 22 so as to cover the drain main body 22. 2 is inserted through the through-hole 2a formed in 2, and its upper end protrudes from the upper surface of the bottom plate 2 of the rain gutter 1, and its lower part is buried in the ground. Among these, as shown in FIG.1 (c), the drain main body 22 has the net | network part 22a formed in the cross-sectional circle | round | yen using polyethylene as a raw material, the connection part 22b, and many water flow holes 22c, As a whole, the cylindrical length is formed to be 40 cm or more. The shape of the drain main body 22 is not limited to a cylindrical shape, and may be a columnar shape. Further, the other covering material 23 is formed in a sheet shape from a nonwoven fabric having a large number of water passage gaps (reference numerals are omitted) that are finer than the water passage holes 22c of the drain main body 22 and are capable of water passage. The entire outer periphery of the drain body 22 is covered so as to be wrapped over a plurality of layers, and the end 23a is bonded (see FIG. 5). In addition, a cap 24 is attached to the upper end portion of the drain member 21 and protrudes from the upper surface of the bottom plate portion 2 of the rainwater tank 1, and a cap 25 is attached to the lower end portion.

  In the rainwater tank construction structure according to the second embodiment, since the upper end portion of the drain member 21 and the cap 24 are disposed so as to protrude from the upper surface of the bottom plate portion 2 of the rainwater tank 1, Even if sediments or the like are deposited in 1, the sediment 21 is prevented from being clogged because sediment is not deposited on the drain material 21. Therefore, it is preferable that the amount of protrusion from which the drain member 21 protrudes from the upper surface of the bottom plate portion 2 of the rainwater trough 1 is as high as possible. Further, since it has a length of 40 cm or more, as shown in FIG. 4, even if an impermeable layer such as a clay layer is formed in the lower layer M in which the rainwater trough 1 is embedded, this impermeable water By burying the drain material 21 in the formation N which is a water permeable layer such as a sandy soil layer formed under the layer, the rainwater collected in the rainwater trough 1 is collected in the drain material 21. Is filtered through the water passage holes 22c of the drain main body 22 and the water passage gaps of the covering material 23 to penetrate deep into the ground. Therefore, it is preferable to make the total length of the drain material 21 as long as possible. In addition, as for the form of the full length of this drain material 21, although one full length may be shape | molded by 40 cm or more, even if one full length is shorter than 40 cm, if it is comprised by more than 40 cm by multiple pieces good. And what is necessary is just to set the full length of the drain material 21 embed | buried in the ground to the length corresponding to the depth of the burial hole H to be constructed. Moreover, the joint part in the case of comprising a plurality of drain members 21 may be adhered or simply brought into contact.

The construction structure of the rainwater basket concerning the 1st Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is the A section expanded sectional view shown in (a), (c) is in (a). It is the B section expanded sectional view shown. It is a cross-sectional view which shows the construction structure of the rain water tank concerning the 1st Embodiment of this invention. It is the perspective view which fractured | ruptured partially the construction structure of the rain water tank concerning the 1st Embodiment of this invention. The construction structure of the rainwater basket concerning the 2nd Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is the C section expanded sectional view shown in (a), (c) is in (a). It is the D section expanded sectional view shown. It is a perspective view which shows the state which isolate | separated the cap from the drain material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rain water tank 2 Bottom plate part 2a Drain hole 3, 4, 5, 6 Side plate part 11 Filter body 12 1st filter member 13 Horizontal plate part 13a Water flow hole 14 Vertical plate part 14a Water flow hole 15 2nd filter member 16 Horizontal filter portion 16c Water passage hole 17 Cover material 18 Vertical filter portion 18c Water passage hole 19 Cover material 21 Drain material 22 Drain body 22c Water passage hole 23 Cover material 24, 25 Cap

Claims (5)

A through hole formed in the bottom plate of the rainwater tank,
A hollow or column-shaped drain material having an upper end inserted through the through-hole and having a total length of at least 40 cm and having water permeability so that rainwater that has flowed into the rainwater basin penetrates into the ground. ,
The construction structure of the rainwater tank characterized by comprising.   2. The rainwater tank construction structure according to claim 1, wherein the drain material is wrapped by a cloth-shaped covering member, and at least an upper end is provided with a cap having water permeability.   In the rainwater basin, there is a vertical plate portion facing the whole or part of the inner wall of the rainwater basin with a space, and a space from the lower end of the vertical plate portion to the bottom plate portion of the rainwater basin. A first filter member having water permeability is disposed, and the upper end of the drain material is located below the horizontal plate part constituting the first filter member. The construction structure of the rainwater tank according to claim 1 or 2.   Between the vertical plate part constituting the first filter member and the inner wall of the rainwater tank and / or between the horizontal plate part constituting the first filter member and the bottom plate part of the rainwater tank. The rainwater tank construction structure according to claim 3, wherein a second filter member having water is disposed. The rainwater tank construction structure according to claim 4, wherein the second filter member is wrapped with a cloth-like covering member.