JP5838489B2 - Inflow sand tank - Google Patents

Description

The present invention is buried in the ground as a storage space for collected rainwater, and is inserted into a rainwater storage and infiltration tank for storing the rainwater or storing it temporarily and then slowly infiltrating it into the ground and discharging it. This is related to the inflow sedimentation tank installed.

Usually, the rainwater storage and penetration tank as described above is constructed by burying a storage material in a space excavated and formed in the ground, and then connecting an inflow tank for collecting rainwater and a flow path. The storage material is
It is covered from the outside by a sheet made of non-woven fabric or the like, and has the ability to gradually release rainwater that has flowed into the outside. And by utilizing the performance of such a storage material, the rainwater storage and infiltration tank can store rainwater, or temporarily store it in the ground after temporarily storing rainwater. It is used as a disaster prevention pond.
On the other hand, when such rainwater storage and penetration tanks are mixed with rainwater and foreign matter such as earth and sand, mud, and dust flows, the foreign matter clogs the sheet made of non-woven fabric and the storage and penetration performance deteriorates. . Therefore, in order to maintain the storage / penetration performance, the rainwater storage / penetration tank requires maintenance work such as cleaning for removing the foreign matter, but the storage material is in a state embedded in the ground. The maintenance work becomes very difficult.
In order to perform the maintenance work of the rainwater storage and permeation tank as described above, Patent Document 1 discloses that a space is provided at the bottom of the rainwater storage and permeation tank, and the maintenance work is performed when an operator enters such a space. Patent Documents 2 and 3 disclose that a manhole is provided to make it easier for an operator to enter such a groove or space. However, the grooves and spaces created at the bottom of the rainwater storage and penetration tank are so narrow that maintenance work is difficult to perform, and the entire bottom of the rainwater storage and penetration tank cannot be cleaned. Since foreign matter is entangled with the sheet made of nonwoven fabric laid on the bottom surface of the storage and permeation tank, maintenance work sufficient to maintain the performance of the rainwater storage and permeation tank cannot be performed.
Therefore, Patent Documents 4 and 5 disclose that rainwater flowing out from the inflow trough is sent to the inflow sand settling tank, and after removing foreign matter in the inflow sand settling tank, it is sent to the inside of the rainwater storage and penetration tank. The inflow sand settling tank is formed to have a vertically long tank shape composed of a plurality of wall portions arranged to partition the storage material. The inflow sand basin is buried in the ground, so that it can withstand the earth pressure, the concrete is used as a material, the peripheral wall is thick, and it is integrally formed by precast molding. .

JP 2001-90167 A JP 2006-307494 A Japanese Patent Laid-Open No. 2004-19122 JP 2005-120658 A JP 2008-291498 A

However, foreign substances accumulate in the internal space of the conventional inflow sand settling tank, so that an operator enters the internal space to perform maintenance work.However, since the peripheral wall is thick, the outer size is large. In comparison, the internal dimensions are very small and the internal space is narrow, so there is a problem that maintenance work cannot be performed sufficiently.
In addition, when constructing the rainwater storage and penetration tank, after excavating a hole of a size that can accommodate the above-mentioned storage material, including the inflow sand settling tank, it flows into the hole according to the position of the pipe extending from the inflow trough. A sand settling tank is installed, and then the hole is filled with the storage material so as to fill the periphery of the inflow sand settling tank. If the installation position of the inflow sedimentation tank is shifted at the time of construction, it is impossible to fill the storage material at the periphery of the hole and it is impossible to expand the hole, so take out the storage material once filled from the hole. In addition, the construction work must be re-started from the beginning, such as re-installing the inflow sedimentation tank and refilling the storage material again.
There will be a problem of time lag. Therefore, when installing the inflow sand settling tank, it is necessary to carefully adjust the installation position, but it is not only made of concrete, but the inflow sand settling tank formed integrally with the thick peripheral wall has its weight. Is very heavy and can only be installed by using a heavy machine such as a crane, so it was impossible to finely adjust the installation position.
The present invention has been made paying attention to such problems existing in the prior art. Its purpose is to prevent foreign matter such as earth, sand, mud, and dust from flowing into the rainwater storage and penetration tank, and to have a sufficiently large internal space to allow sufficient maintenance work, and It is to provide a lightweight inflow sand tank.

As means for solving the above problems, the inflow sand bath of the invention is a flowing sand bath that is inserted installed rainwater storage infiltration tank, has a trough-shaped body of the elongated, the tank-like body A square wall comprising a bottom wall portion and a peripheral wall portion erected on the periphery of the upper surface of the bottom wall portion, and the peripheral wall portion includes a front wall portion, a rear wall portion, and a pair of left and right side wall portions. The bottom wall portion, the front wall portion, the rear wall portion, and the pair of left and right side wall portions are formed as separable separate bodies and assembled into a rectangular tube shape when installed. Is arranged so that the side surface of the front wall portion is in contact with the inner surface of the front wall portion, and is connected to the front wall portion by a connecting material inserted from the outer surface of the front wall portion. In addition to a plurality of communication windows that are considered to be rainwater overflow outlets, a rainwater inlet is also provided. Has become manner is, the peripheral wall portion of the tank-shaped body, and summarized in that is used resin concrete material.

[Action]
According to the inflow sand settling tank according to claim 1, resin concrete uses a thermosetting resin as a binder, and the thermosetting resin is cured with a high bonding force by a polymerization reaction. By using cement, it is possible to obtain a dense molded product having high strength and excellent durability as compared with normal concrete (cement concrete) that is hardened by a hydration reaction. Therefore, the inflow sand settling tank made of resin concrete has the same or higher strength than that of cement concrete with a thick peripheral wall, even if the peripheral wall is thin. It is possible to provide an internal space that is as wide as possible and to reduce the weight.
In addition, the inflow sand settling tank is formed such that the bottom wall portion, the front wall portion, the rear wall portion, and the pair of left and right side wall portions of the tank-shaped main body are separately separable, so that the bottom wall of the tank-shaped main body is formed. As compared with the case where the part and the peripheral wall part are formed as a cylindrical unit, the installation work of the inflow sand settling tank can be simplified. That is, the tank-shaped main body is formed of a material such as concrete or resin concrete, but the integrally formed one has a very heavy weight, so that a heavy machine such as a crane is required for installation. On the other hand, the tank-shaped main body formed as a separate body in which each wall portion can be separated is of course lighter than the one in which the weight of each wall portion is formed integrally, so that heavy equipment is not necessarily required for installation. It is also possible for the operator to perform the construction manually. In addition, what is formed as a separate unit for each wall can be easily moved because of its light weight.For example, when determining the installation position, only the bottom plate is used. As a result, the construction flexibility is increased.
Furthermore, since the side wall portion is arranged so that the side surface of the side wall portion touches the inner surface of the front wall portion, and is connected to the front wall portion by a connecting material inserted from the outer surface of the front wall portion, Since the connecting member is inserted from the direction in which the earth pressure is applied and the earth pressure can be suitably received by the front wall portion, the earth pressure resistance performance which is not inferior to that formed integrally can be imparted.

〔effect〕
According to the inflow sand settling tank of the present invention, foreign substances such as earth and sand, mud, and dust can be prevented from flowing into the rainwater storage and penetration tank, and the internal space is wide enough to perform maintenance work sufficiently. And it can be made lightweight.

(A) which shows the inflow settling tank of embodiment is the front view, (b) is the perspective view seen from the back surface. (A) is the unit plate material for bottom walls, (b) is a perspective view which shows a bottom wall part. (A) which shows the unit board | plate material for rear walls, (b) is the perspective view seen from the inner surface. (A) which shows the unit board material for front walls is the perspective view seen from the outer surface, (b) is an inner surface, (c) is a perspective view of the upper stage board | plate material for front walls. (A) which shows the 1st unit board | plate material for side walls, (b) is the perspective view seen from the inner surface. (A) which shows the 2nd unit board | plate material for side walls, (b) is the perspective view seen from the inner surface. (A) is a perspective view showing the filter for the middle part, (b) is the filter for the upper part. The conceptual diagram which shows the state which lays a bottom wall part. (A) is the state which finely adjusts an installation position, (b) is a conceptual diagram which shows the state which laid the bottom wall part. (A) is the state which assembled the lower step part, (b) is a conceptual diagram which shows the state which assembles the upper step part from a middle step part. (A) The state which installed the inflow sedimentation tank, (b) is a conceptual diagram which shows the state which constructed the rainwater storage penetration tank.

Hereinafter, the embodiment which actualized the inflow sand settling tank of the present invention is described.
As shown in FIGS. 1 (a) and 1 (b), the inflow sand settling tank of the present embodiment is a substantially vertically long tank-shaped body 10.
And a plurality of communication windows 11 are provided on the peripheral wall of the tank-shaped main body 10. The inflow sand settling tank is inserted and installed in a position where an inflow pipe extending from an inflow tank for collecting rainwater is connected in the rainwater storage and penetration tank.
In the inflow sand settling tank, the communication window 11 is used as a rainwater overflow port, and a rainwater inlet (not shown) is formed at a predetermined location on the peripheral wall of the tank-shaped body 10. Yes. Then, the inflow sand settling tank is connected to the rainwater inflow port to connect the inflow pipe, thereby collecting rainwater from the rainwater inflow port to the inside, collecting the rainwater from the collected rainwater, mud, After removing foreign matters such as dust, the rainwater is overflowed from the rainwater overflow port and sent into the rainwater storage and penetration tank.
In particular, in this embodiment, a rainwater inflow port is provided in the front portion (front wall portion 15 described later) of the peripheral wall of the tank-shaped main body 10, and both left and right sides (side wall portions 17 described later) of the peripheral wall of the tank-shaped main body 10. By making the communication window 11 provided in the rainwater overflow port, the rainwater flowing from the rainwater inlet port is
While falling off the momentum by hitting the rear wall portion 16, it falls to the bottom of the tank-shaped main body 10 and temporarily stops inside the tank-shaped main body 10. To settle. Thereafter, rainwater accumulates to some extent inside the tank-shaped main body 10, the water level rises, and when it reaches the rainwater overflow port, it gradually overflows to the outside, so that the foreign matter that has settled at the bottom of the tank-shaped main body 10 Without being caught in the overflow of rainwater, it is in a state of being settled.
Since the inflow sand settling tank removes foreign matter from rainwater as described above, the foreign matter is stored inside the tank-shaped main body 10, particularly at the bottom. Therefore, in order to perform maintenance work such as removal and cleaning of the foreign matter, a handle 12 serving as a clue or footing for an operator to enter and exit the tank-shaped main body 10 is provided on the inner surface of the peripheral wall of the tank-shaped main body 10. Is provided.
Further, as described above, since foreign matter is accumulated particularly at the bottom of the tank-shaped main body 10, the communication window 11 which is used as a rainwater overflow port is formed in the tank shape so as to suppress leakage of the foreign matter into the rainwater storage and penetration tank. Body 1
It is desirable to provide except for the lower part of the zero peripheral wall. For this reason, in the inflow settling tank of this embodiment,
The communication window 11 is provided in the upper and middle steps of the peripheral wall of the tank-shaped main body 10.
Although not specifically shown, a manhole is installed on the upper part of the inflow sand settling tank during the construction of the rainwater storage and infiltration tank, and if necessary, the inflow sand settling tank through the manhole. It is possible to go in and out of.

The tank-shaped main body 10 includes a bottom wall portion 13 and a peripheral wall portion erected on the periphery of the upper surface of the bottom wall portion 13. Further, the peripheral wall portion is formed in a rectangular tube shape including a front wall portion 15, a rear wall portion 16 and a pair of left and right side wall portions 17.
In addition, the square cylinder shape here has shown the shape which has four substantially flat surfaces which can be recognized as a front surface, a rear surface, and a pair of left and right side surfaces on its outer peripheral surface, and each side edge and each corner portion are not necessarily substantially perpendicular. Not only the shape but also the round shape that is chamfered or the like is included.

The bottom wall portion 13, the front wall portion 15, the rear wall portion 16, and the pair of left and right side wall portions 17 are formed as separate bodies that can be separated from each other. In order to form the square cylindrical shape of the peripheral wall portion, the front wall portion 15 and the side wall portion 17, and the rear wall portion 16 and the side wall portion 17 are connected to each other by using a bolt 18 which is a connecting material. And the said tank-shaped main body 10 whole is formed by forming the said bottom wall part 13, the said front wall part 15, the said rear wall part 16, and the said left-right paired side wall part 17 as a separate body instead of united. Since the weight of each wall portion is lighter than the weight of each, the movement, handling and handling of the wall portions 13, 15, 16, and 17 during transportation, installation and construction can be simplified.

Each of the wall portions 15, 16, and 17 is connected such that the side wall portion 17 is arranged such that the side surface of the side wall portion 17 contacts the inner surface of the front wall portion 15 or the rear wall portion 16. This is done by inserting a bolt 18 from the outer surface of the portion 15 or the rear wall portion 16. That is, since the earth pressure is applied to the inflow sand settling tank from the front wall portion 15 (see FIG. 11B), the earth pressure is reduced by inserting the bolt 18 from the outer surface of the front wall portion 15 or the rear wall portion 16. The direction of application and the direction of insertion of the bolt 18 can be aligned. As a result, it is possible to prevent earth pressure from being applied to the shaft of the bolt 18 from the lateral direction, and the peripheral wall portion formed as a separate body capable of separating the wall portions 15, 16, and 17 is compared with that integrally formed. However, the strength can be inferior.
The connecting material is not limited to the bolt 18 and may be, for example, a rivet, a pin, or a metal rod as long as the peripheral wall portion can exhibit a desired strength.

Furthermore, not only is each of the wall portions 13, 15, 16, and 17 formed as a separable separate body, but also a combination of a plurality of unit plate materials, the weight of the unit plate material compared to the weight of each wall portion. Therefore, it is possible to further simplify the movement and handling of the wall portions 13, 15, 16, and 17 during transportation, installation, and construction.

The bottom wall portion 13 will be described. As shown in FIGS. 2A and 2B, the bottom wall portion 13 is configured by combining a plurality of bottom wall unit plate members 13A, which are unit plate materials. In the present embodiment, the bottom wall portion 13 is configured by combining two bottom wall unit plate members 13A. However, the present invention is not limited to this, and for example, for four bottom walls according to the installation space of the inflow sand basin. Unit plate 13A
Alternatively, the bottom wall portion 13 may be configured by combining the eight bottom wall unit plate members 13A.
The bottom wall unit plate member 13A is formed in a horizontally long rectangular shape. The bottom wall portion 13 formed by combining the two bottom wall unit plate members 13A has a concave groove 21 formed on the periphery thereof on the upper surface. The concave groove 21 is for suppressing the displacement of the peripheral wall portion with respect to the bottom wall portion 13, and a part of the lower end of each of the wall portions 15, 16, and 17 constituting the peripheral wall portion is inserted. It is like that.

The rear wall portion 16 will be described. The rear wall portion 16 is configured by vertically stacking a plurality of rear wall unit plate members 16A, which are unit plate members. In the present embodiment, the rear wall portion 16 is configured by combining three rear wall unit plate members 16A. However, the present invention is not limited to this, and in accordance with the depth of the hole in which the inflow sand settling tank is installed, The rear wall unit plate material 16A may be combined, or four or more rear wall unit plate materials 16A may be combined.
As shown in FIGS. 3A and 3B, the rear wall unit plate member 16A is formed in a horizontally long rectangular shape. Insertion holes 22 through which the shafts of the bolts 18 are inserted are formed in both side edges of the rear wall unit plate member 16A in the thickness direction of the rear wall unit plate member 16A. The handle 12 is attached to the inner surface of the rear wall unit plate member 16A.

The front wall portion 15 will be described. The front wall portion 15 is a unit plate material.
5A and the front wall upper plate member 24 are stacked. In the present embodiment, the front wall portion 15 is configured by stacking one front wall upper plate member 24 on one front wall unit plate member 15A. Depending on the depth of the hole to be installed, two or more front wall unit plate materials 15A may be stacked one above the other and the front wall upper plate material 24 may be stacked thereon, or further above the front wall upper plate material 24. The front wall unit plate members 15A may be stacked.
As shown in FIGS. 4A and 4B, the front wall unit plate member 15A is formed in a horizontally long rectangular shape. Insertion holes 22 through which the shaft portions of the bolts 18 are inserted are formed in both side edges of the front wall unit plate member 15A in the thickness direction of the front wall unit plate member 15A. Further, on the inner surface of the front wall unit plate material 15A, a thin concave portion 23 for reducing the weight of the front wall unit plate material 15A or expanding the internal space of the inflow sand settling tank in the front wall unit plate material 15A. Is formed.
As shown in FIG. 4C, the upper wall plate member 24 for the front wall is composed of a square frame-like frame frame 24A and a grating material 24B stretched inside the frame frame 24A. The frame frame 24A is formed using a metal such as iron or stainless steel as a material, and insertion holes 22 through which the shaft portions of the bolts 18 are inserted are formed on both side edges of the frame frame 24A. It penetrates in the thickness direction. The grating material 24B is a plate material provided with perforations, and the rainwater inflow port is formed by perforating the grating material 24B with a hole saw or the like.
By the way, an inflow pipe extending from an inflow basin for collecting rainwater is connected to the rainwater inlet, and various inflow diameters are used for the inflow pipe. It is necessary to form a rainwater inlet to meet Therefore, the upper wall plate 24 for the front wall is made longer than the unit plate material 15A for the front wall so as to flexibly correspond to the diameter and connection position of the inflow pipe to be connected, and the grating material 24B. By widening the area in which the rainwater is stretched, the range in which the rainwater inlet can be formed by perforation is widened.
Since the grating material 24B is a plate material provided with perforations, it is sufficiently lighter than a normal plate material, and the use of the grating material 24B makes it possible to reduce the weight of the front wall upper plate material 24. The material of the grating material 24B includes various materials such as metal, synthetic resin, concrete, etc., but if the grating material 24B is hard, it becomes difficult to form a rainwater inlet, and for the front wall. Since the upper plate member 24 is larger than the front wall unit plate member 15A, the weight increases. Therefore, it is desirable to use synthetic resin, particularly fiber reinforced plastics such as FRP, from the viewpoints of strength maintenance, processability, and weight reduction. .

The side wall portion 17 will be described. The side wall portion 17 is configured by vertically stacking a side wall first unit plate material 17A and a side wall second unit plate material 17B as unit plate materials. In this embodiment, the side wall 17 is configured by stacking two second unit plate members 17B for side walls on the first unit plate material 17A for one side wall. However, the present invention is not limited to this. The side wall portion 17 may be configured by stacking two or more second unit plate members 17B for side walls on the two or more first unit plate materials 17A for side walls in accordance with the depth of the holes in which the first and second side walls are installed.
As shown in FIGS. 5A and 5B, the first unit plate material 17A for the side wall is formed in a horizontally long rectangular shape. Wall receiving portions 25 are provided on both side edges on the inner surface of the first unit plate member 17A for side walls. A screw hole 26 into which the shaft portion of the bolt 18 is screwed is formed in the side surface of the wall receiving portion 25 in the lateral direction. Accordingly, the shaft portion of the bolt 18 screwed into the screw hole 26 is not exposed to the inside of the tank-shaped main body 10, and an operator or the like who has entered the inside loosely loosens the bolt 18. It is supposed not to do.
As shown in FIGS. 6A and 6B, the second unit plate member 17B for side walls has the same configuration as the first unit plate member 17A for side walls except that the communication window 11 is provided. The communication window 11 is used as a rainwater overflow port, and rainwater inside the inflow sedimentation tank overflows from the communication window 11 which is a rainwater overflow port.
In the present embodiment, the communication window 11 has a vertically long rectangular shape, and 3 on the second unit plate member 17B for side walls.
However, the shape and the number are not particularly limited. For example, the shape and the number may be circular, elliptical, or only one, or four or more.

In the side wall part 17, the second unit plate material 17 for the side wall which is the inside of the tank-shaped main body 10.
Filters 27A and 27B are provided on the inner surface of B. As shown in FIGS. 7A and 7B, the filters 27A and 27B are composed of a frame-like body and a net stretched inside the frame-like body. The filters 27A and 27B are attached and fixed to the inner surface of the second unit plate member 17B for side walls via the frame-like body. The filters 27A and 27B are provided for the side wall, which is a peripheral wall of the tank-shaped body 10, with a portion facing the communication window 11 serving as the rainwater overflow opening facing upward from the lower side of the rainwater overflow opening. An inclined portion 28 is formed so as to be gradually separated from the inner surface of the second unit plate member 17B.
When passing through the filters 27A and 27B, the rainwater flows from the inner surface to the outer surface of the filters 27A and 27B, so that the foreign matter mainly adheres to the inner surfaces of the filters 27A and 27B. For this reason, the foreign matters adhering to the inclined portions 28 of the filters 27A and 27B are
The foreign matter itself is always about to drip from the inclined portion 28 due to the weight of the foreign matter.
Sticking to is suppressed. When the rainwater level falls inside the inflow sand basin, foreign matter adhering to the inclined portion 28 due to the surface tension of the rainwater is removed by being lifted from the inner surface and removed. However, when the rainwater level falls inside, the self-cleaning action of the filters 27A and 27B is exhibited.
In the filters 27A and 27B, the upper part of the intermediate part filter 27A attached to the middle part of the tank-shaped main body 10 is closed by a lid 29, and the intermediate part filter 27A
The foreign matter is prevented from entering the inside of the door and coming out of the communication window 11 (rain overflow port). The lid 29 is formed of a plate material that is not provided with pores,
The lid 29 is prevented from being clogged by foreign matter, and the surface of the lid 29 (
In particular, even if foreign matter adheres to the upper surface), it can be removed by scrubbing the foreign matter when the level of rainwater falls inside the inflow sand settling tank.
On the other hand, in the filters 27A and 27B, the upper filter 27B mounted on the uppermost stage of the tank-shaped main body 10 is open at the top, for the following reason. That is,
When a large amount of rainwater flows into the inflow sand settling tank until it reaches the upper edge of the upper filter 27B, there is a high possibility that the rainwater will overflow from the inside of the tank-shaped body 10 to the outside. In such a case, since the rainwater storage and penetration tank including the inflow sedimentation tank is constructed in order to prevent flooding or the like, it is important to prevent the rainwater from overflowing outside rather than removing foreign matter. The Therefore, the upper filter 27B is configured to overflow rainwater without causing resistance to overflow from the rainwater overflow opening by opening the upper portion.

Except for the upper wall plate 24 for the front wall, a protrusion 30 extends in the width direction of the rear wall unit plate material 16A on the inner surface of each unit plate material 15A, 16A, 17A, 17B at the center of the lower edge, And it is formed so as to protrude downward. The ridges 30 are formed by the unit plate members 15A, 16A, 1
7A and 17B, which are arranged at the lowermost level, are fitted into the concave grooves 21 of the bottom wall portion 13 described above. On the other hand, the unit plate members 15A, 16A, 17A other than the one arranged at the lowest stage,
In 17B, the ridges 30 are hooked on the upper end edges of the unit plate members located in the lower stage, thereby suppressing the positional deviation between the upper and lower unit plate members.

In the tank-shaped main body 10, the peripheral wall portion including the front wall portion 15, the rear wall portion 16, and the pair of left and right side wall portions 17 uses resin concrete as a material. The resin concrete uses an aggregate such as sand, gravel, lightweight aggregate and the like and a binder made of a thermosetting resin. Examples of the thermosetting resin include unsaturated polyester, thermosetting polyester, urethane resin, melamine resin, thermosetting acrylic resin, urea resin, phenol resin, and epoxy resin.
The resin concrete has particularly high tensile strength, bending strength, and compressive strength.
The thickness and weight of 5, 16, and 17 can be reduced. In addition, it exhibits excellent corrosion resistance against various chemicals, and in particular, it has an advantage that it can be used in acidic soils such as coasts and hot springs because it is resistant to corrosion by hydrogen sulfide. In addition, the water absorption rate is very small, the strength is not deteriorated due to freezing and thawing, and the surface is smooth, so that it has excellent hydraulic characteristics and foreign matter is hard to stick. Furthermore, since it absorbs vibration, it has an advantage of excellent earthquake resistance.
The tank-shaped main body 10 using the resin concrete as a material has the wall portions 13, 15, 16.
, 17 can be reduced to about 3 cm, and even if the outer dimension (vertical width or horizontal width in plan view) of the tank-shaped main body 10 is 1 m, the operator can easily perform maintenance work on the internal space. It is possible to make the space as large as possible.
In the tank-shaped main body 10, the bottom wall portion 13 may use the resin concrete as a material, or may use a thermoplastic resin as a material. Examples of the thermoplastic resin include olefin resins such as polypropylene (PP), polyethylene (PE), and polybutadiene (BDR), styrene resins such as polystyrene (PS), and polymethyl methacrylate resin (
Acrylic resin such as PMMA), acrylonitrile / butadiene / styrene copolymer (ABS)
) Resin, Polycarbonate (PC), Polyvinyl chloride (PVC), Polyvinylidene chloride (
PVDC) and the like. When a thermoplastic resin is used for the material of the bottom wall portion 13, there is an advantage that the warp of the bottom wall portion 13 is corrected by the weight applied by the peripheral wall portion or the like.

The construction method of the rainwater storage and penetration tank including the inflow sand settling tank will be described.
When constructing the rainwater storage and penetration tank, as shown in FIG. 8, first, a construction planned site is excavated to form a hole H, the inside of the hole H is arranged, and then the bottom wall unit plate material 13A. As many as necessary are carried to the bottom of the hole to assemble the bottom wall portion 13 and temporarily determine the installation position of the inflow sand settling tank. Then, the cage-like container bodies A that will constitute the storage material are arranged in order from the edge of the hole bottom, and are filled without any gaps.
Regarding the transportation of the bottom wall portion 13, the bottom wall portion 13 is divided into a plurality of bottom wall unit plate members 13 </ b> A, and, as described above, resin concrete or thermoplastic resin is used as a material. Yes, the operator himself can carry it in his hand.
Next, as shown in FIG. 9A, after the cage container body A is filled to some extent, the bottom wall portion 13 is moved to finely adjust the installation position of the inflow sand tank. At this time, as described above, the bottom wall portion 13 is divided into a plurality of bottom wall unit plate members 13A, and is lightweight because it uses resin concrete or thermoplastic resin as a material as described above. The installation position can be finely adjusted by moving the bottom wall 13 with the user's own hand. Then, after finely adjusting the installation position, the basket-like container body A is spread over the entire hole bottom.
Next, as shown in FIG. 10 (a), a front wall unit plate material 15 A, a rear wall unit plate material 16 A, and a pair of left and right side wall first unit plate materials 17 A are arranged on the bottom wall portion 13. It connects and the lowest step of the tank-shaped main body 10 is assembled. Subsequently, as shown in FIG. 10B, a plurality of rear wall unit plate members 16 </ b> A and side wall second unit plate members 17 </ b> B are sequentially stacked in accordance with the depth of the hole, and each is connected by a bolt 18. Is done.
In addition, the dimension of the inflow sand settling tank is set in accordance with the dimension of the cage container A. That is, the height of each step of the inflow sand settling tank is the same as the height of the cage container A. In addition, the outer size of the inflow sand tank is approximately an integral multiple of the outer size of the cage-like container A (about twice in this embodiment).
Then, as shown to Fig.11 (a), the upper-stage board | plate material 24 for front walls is assembled | attached, and installation of an inflow sand settling tank is completed. And as shown in FIG.11 (b), the cage-shaped container body A is spread | laid in the hole H so that the circumference | surroundings of this inflow sand settling tank may be filled up. Then, according to the application,
Various sheets, such as a protective sheet and a water permeable sheet, are laid and the hole is backfilled to complete the construction of the rainwater storage and penetration tank.

According to the inflow sand settling tank of the present invention, it is possible to prevent foreign matter such as earth and sand, mud, and dust from flowing into the rainwater storage and penetration tank, and to simplify the maintenance work. there is a possibility.

DESCRIPTION OF SYMBOLS 10 Tank-shaped main body 11 Communication window 12 Handle 13 Bottom wall part 13A Unit board material for bottom wall 15 Front wall part 15A Unit board material for front wall 16 Rear wall part 16A Unit board material for rear wall 17 Side wall part 17A 1st unit board material for side wall 17B Second unit plate material for side wall 18 Bolt 21 Groove 22 Insertion hole 23 Thin wall recess 24 Upper plate for front wall 24A Frame frame 24B Grating material 25 Wall receiving portion 26 Screw hole 30 Projection 27A, 27B Filter

Claims (1)

An inflow sand settling tank inserted and installed in the rainwater storage and penetration tank,
It has a vertically long tank-shaped body,
The tank-shaped main body is composed of a bottom wall portion and a peripheral wall portion standing on the periphery of the upper surface of the bottom wall portion. The peripheral wall portion further includes a front wall portion, a rear wall portion, and a pair of left and right side walls. The bottom wall part, the front wall part, the rear wall part, and the pair of left and right side wall parts are formed as separable separate bodies and assembled into a square cylinder shape for installation,
The side wall portion is arranged so that the side surface of the side wall portion contacts the inner surface of the front wall portion, and is connected to the front wall portion by a connecting material inserted from the outer surface of the front wall portion,
Furthermore, the peripheral wall portion of the tank-shaped main body is provided with a plurality of communication windows serving as a rainwater overflow port, and a rainwater inlet port is provided.
The peripheral wall portion of the tank-shaped main body uses resin concrete as a material, and is an inflow sedimentation tank.

Images