JP2007231734A - Infiltrating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infiltrating structure for improving an existing draining facility for eliminating rainwater into a sewer or the like, into an infiltrating facility for infiltrating rainwater into underground. <P>SOLUTION: A through-hole 15 is formed in a bottom wall 11 of a catch basin 10. A steel pipe is driven into the ground through the through-hole 15, and sediment in the steel pipe is sucked out. A vinyl chloride pipe wound with a flood sheet 3 is inserted into the steel pipe, and crushed stone 2 is filled in the vinyl chloride pipe down to the position of the bottom wall 11 of the catch basin 10. Only the vinyl chloride pipe is pulled out of the steel pipe, and then the steel pipe is pulled out of the through hole 15. When the crushed stone 2 is sunk from the bottom wall 11 of a water collecting facility 10, an insufficient portion of crushed stone 2 is filled from the through hole 15, and the upper face of the crushed stone 2 is lightly compacted by rolling. The vinyl chloride pipe 5 is then erected upward in the water collecting facility 10 from the through hole 15. The length of the vinyl chloride pipe 5 is determined by treating the rainwater by a peak cut method or a base cut method, and a filter 6 is detachably installed at an upper opening part of the vinyl chloride pipe 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an infiltration structure for infiltrating rainwater or the like collected in a water collection facility into the ground.

  In recent years, with the progress of urbanization, the number of impervious areas where rainwater does not penetrate underground has increased, causing problems due to changes in the water cycle, such as frequent urban floods, depletion of clear streams, deterioration of water quality, and reduction of groundwater. . In areas where combined sewers are installed, improvements to runoff during heavy rainfall have been demanded. Infiltration of rainwater into the ground is encouraged as a means to solve the above problems, and various infiltration facilities have been developed.

  FIG. 13 shows a general infiltration facility that is normally used, and is a facility type using an infiltration mass. This infiltration facility has a structure in which the periphery of the infiltration mass is filled with crushed stone and the collected rainwater is infiltrated into the ground from through holes provided in the side wall and bottom of the infiltration mass.

  Moreover, there exists what is disclosed by following patent document 1 as another form of infiltration facility. As shown in FIG. 14, the permeation facility corresponds to a perforation manhole, a permeation pipe, or a through hole 51 provided in the peripheral wall of the permeation mass 50, in a direction orthogonal to the axial direction of the permeation manhole 50 and the like, and It is intended to increase the effective area of the filter 52 and improve the drainage capacity of rainwater by providing a filter 52 comprising an outer cylinder, an inner cylinder and a filter element so as to project outward from the infiltration manhole 50 and the like. is there. One end portion of the outer cylinder on the permeation manhole 50 side is fitted and fixed to the through hole 51, and a filter frame 53 provided with a lattice-like frame body is fitted into the outer frame at the other end portion of the outer cylinder. And is detachably fixed. A crushed stone element made of a plurality of crushed stones (not shown) is laid between the outer ground such as the seepage manhole 50 and the like.

JP-A-11-200462

  However, when constructing and constructing the conventional infiltration facility, the excavator for installing the infiltration mass and the filled crushed stone, the laying work of the permeable sheet in the excavation, the foundation filling crushed stone in the excavation, Major work such as installation work, side filling crushed stone work, top surface penetration sheet work, backfill work, etc. was necessary, and problems such as high installation costs and inability to secure the installation location occurred .

  In addition, the existing facilities that are used in the combined sewerage system and are composed of water collection masses, drainage masses, etc. that do not have through-holes in the side walls or bottoms, are constructed from the above-mentioned infiltration masses, etc. Even in the case of improvement, construction such as removal of side grooves, excavation, replacement of mass, etc. is necessary, and problems occur as in the case of the above-mentioned new installation.

  Under such circumstances, therefore, development of a simpler and more effective infiltration facility is expected. In particular, in areas where drainage facilities that do not have an infiltration function are already installed, it is expected that simple and effective infiltration facilities will be realized by improving the existing facilities.

  Therefore, the present invention has been made in view of such circumstances, and it is simple and highly effective to allow rainwater to permeate underground into existing water collection facilities or drainage facilities for removing rainwater into sewers and water bodies. The purpose of the present invention is to provide an osmotic structure for improving the osmosis facility or an osmosis structure in the case of newly establishing an osmosis facility for allowing rainwater to penetrate underground.

  In order to solve the above-mentioned problem, the invention of the infiltration structure according to claim 1 forms a through-hole in the bottom wall of a water collection facility including a water collecting trough, a water collecting trench, a water collecting side groove, and a water collecting manhole, A penetrating structure provided in the vertical direction from the ground to the water collection facility through the through hole, and the crushed stone filled in the hole formed in the ground downward from the through hole of the bottom wall; A permeation part that is arranged so as to enclose the crushed stone and that prevents inflow of earth and sand from the ground into the crushed stone, and is erected in the water collecting facility upward from the through hole of the bottom wall. An infiltration cylinder fixed to the bottom wall of the water collection facility and made of a cylindrical material including a PVC pipe, a clay pipe, and an iron pipe, and a detachable filter disposed so as to cover the upper opening of the infiltration cylinder It is characterized by this.

  Further, the invention of the osmotic structure according to claim 2 is characterized in that, in the invention of claim 1, the osmotic portion has a vertically long shape.

  The invention of the penetration structure according to claim 3 is the invention according to claim 1 or 2, wherein the shape of the through hole and the horizontal sectional shape of the penetration portion and the penetration cylinder have the same shape. The shape is circular or polygonal.

  The invention of the osmotic structure according to claim 4 is the invention according to claim 1 or 2, wherein the shape of the hole formed in the ground downward from the through hole and the shape of the osmotic portion are cylindrical. Having a truncated cone shape or a quadrangular pyramid shape

  According to the osmotic structure according to the present invention, an existing drainage facility that excludes rainwater into sewers and the like can be easily and effectively infiltrated with rainwater in a short period of time while suppressing improvement in construction cost. It can be improved to an infiltration facility.

  Moreover, the infiltration part has a vertically long shape, the depth of excavation is large, the design head and the infiltration area can be increased, and the amount of rainwater infiltration into the ground can be increased. In addition, the filter disposed at the upper opening of the permeation cylinder can be easily replaced and cleaned, which is advantageous in terms of maintenance of the permeation structure. In addition, by changing the length of the permeation cylinder standing in the water collection facility upward from the through hole, the height at which the filter is arranged can be adjusted, so that the filter can be prevented from being clogged. Can do. Furthermore, since the length of the standing permeation cylinder can be easily changed, either the rainwater permeation base cut method or the peak cut method can be easily selected.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a osmotic structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing one embodiment of the osmotic structure. The infiltration structure 1 is a structure for allowing water collected in a water collection facility (also referred to as a drainage facility) to penetrate into the ground, and is provided on a bottom wall (also referred to as a bottom wall) 11 of the water collection facility. . In the embodiment shown in FIG. 1, a water collecting basin 10 will be described as a water collecting facility. As shown in FIG. 2, the water collecting basin 10 is mainly used as a water collecting facility for collecting road drainage or rainwater from a site, and has a structure with a bottom. A water collecting lid 12 is disposed on the upper side of the water collecting rod 10, and drainage water flowing on the road, rainwater flowing from the adjacent site, etc. are placed in the water collecting rod 10. An inflow hole 13 through which the air flows when it flows is provided.

  A through hole 15 is formed in the bottom wall 11 of the water collecting basin 10. The through hole 15 is a hole for providing the osmotic structure 1 according to the present invention, and is formed by a core removal means such as a core removal drill or a core removal cutter. The shape of the through hole 15 is formed in a circular shape in consideration of ease of manufacture. However, the shape is not limited to a circular shape, and may be a polygonal shape such as a triangular shape or a quadrangular shape.

  The osmotic structure 1 passes through the through-hole 15 and extends from the ground into the water collecting basin 10 and is provided in the vertical direction. The osmotic structure 1 is disposed in the hole 16 formed in the ground downward from the through-hole 15, and disposed below the through-hole 15 so as to cross the through-hole 15. 4, the crushed stone ascent prevention means 7 for preventing the ascent of the oscillating member 4, the permeation cylinder 5 erected in the catchment 10 upward from the through-hole 15, and the filter 6 disposed so as to cover the upper opening of the permeation cylinder 5 It consists of and. And the shape of the through-hole 15 and the horizontal cross-sectional shape of the penetration part 4 and the penetration cylinder 5 have the same shape.

  The permeation section 4 includes a crushed stone 2 filled in the hole 16 and a permeation sheet 3 disposed so as to surround the crushed stone 2. The hole 16 is formed vertically below the through hole 15 vertically downward. The hole 16 can be formed by, for example, driving a steel pipe having the same shape as the through hole 15 into the ground through the through hole 15 and sucking out the earth and sand in the steel pipe with a suction machine or the like. By providing the permeation part 4 in the vertically formed hole 16, the design head and permeation area can be increased, so that the amount of water permeation into the ground can be increased. In order to prevent the osmotic part 4 from floating, that is, the crushed stone 2 and the osmotic sheet 3 constituting the osmotic part, crushed stone floating prevention means 7 is provided. The crushed stone levitation preventing means 7 is composed of, for example, a metal rod (metal member) 7 having a length larger than the diameter of the through hole 15, and below the through hole 15, that is, on the upper side (upper surface portion) of the infiltration portion 4. The metal rod 7 is arranged so as to cross the through hole 15 so that both end portions of the metal rod 7 are hooked on the lower wall 11 which is the outer peripheral portion of the through hole 15. Further, a plurality of metal bars 7 are arranged in a lattice shape, and the floating of the crushed stone 2 filled with the lattice of the metal bars, that is, the entry of the crushed stone into the through hole 15 is prevented. In addition, as the crushed stone levitation preventing means 7, a member formed in a mesh lattice shape may be disposed so as to cover the opening of the infiltration portion 4.

As the crushed stone 2 filled in the holes 16, it is desirable to select a crushed stone having a high porosity, and generally a single-grain crushed stone of 20 to 40 mm is used. The infiltration sheet 3 is laid so as to surround the crushed stone 2 at the boundary surface between the underground (earth and sand) and the crushed stone 2 as the infiltration layer, and prevents the earth and sand from the osmotic layer from flowing into the crushed stone 2, Prevent sinking and sinking of the seepage layer. As the osmotic sheet 3, a sheet having sufficient tensile strength, withstanding long-term use in terms of corrosion and the like, and having a water permeability coefficient equal to or greater than that of sand through which water passes well. Specifically, a material having a tensile strength per width of 5 cm of 30 kgf or more, a water permeability of 10 ⁻¹ to 10 ⁻² cm / sec or more, and a thickness of 0.1 to 0.2 mm or more is used. The material of the permeation sheet 3 is polyester, polypropylene, or the like.

  The permeation cylinder 5 erected in the water collecting basin 10 upward from the through hole 15 is fitted into the through hole 15 at the lower end of the permeation cylinder 5 in FIG. It is fixed with mortar. The shape of the permeation cylinder 5 has the same shape as the through hole 15 formed in the bottom wall 11 of the water collecting basin 10. For example, it is comprised from cylindrical objects, such as a vinyl chloride pipe, a clay pipe, and an iron pipe. The length of the permeation cylinder 5, that is, the height of the portion extending upward from the bottom wall 11 into the catchment basin 10 is obtained by treating rainwater flowing into the catchment basin 10 by a peak cut method, Or it determines by processing by a base cut system. That is, whether the rainwater that has flowed in is processed by the peak cut method or the base cut method can be selected by adjusting the length of the permeation tube 5.

  Here, the peak cut method refers to the facility shown in FIG. 1. When the amount of inflow is increased at the beginning of rainfall or when the amount of inflow of rainwater is small, rainwater is discharged to the sewer pipe through the attachment pipe 17. When the water level is exceeded, that is, when the height of the filter 6 is exceeded, rainwater or the like flows into the infiltration portion 4 only after passing through the filter 6. As a result, a large amount of contaminants contained in the initial inflow water settles in the mud reservoir 18 or is discharged to the sewer pipe through the attachment pipe 17. FIG. 1 shows an embodiment of the peak cut method in which the height of the filter 6 (position of arrow A) is set to be higher than the position of the bottom surface of the mounting tube 17 (position of arrow B). .

  In addition, the base cut method is a method in which the inflow water from the beginning of rainfall is infiltrated within the range of the infiltration capacity of the facility, and the portion exceeding the infiltration capacity is overflowed into sewage. In the base cut method, rainwater or the like that has flowed into the water collecting basin 10 passes through the filter 6 and flows into the infiltration portion 4 to be infiltrated into the ground. When the amount of water flowing into the catchment basin 10 increases and the water level in the catchment basin 10 rises, rainwater flows out to the sewer pipe through the attachment pipe 17.

  The filter 6 includes a filter frame 6a formed in a mesh shape as shown in FIG. 3A and a fine filter 6b disposed in the filter frame 6a as shown in FIG. 3B. ing. The filter frame 6a has a mesh-shaped penetration hole, and a fine filter 6b is fixed therein. Moreover, it has the function which prevents that big refuse flows in into the filter frame 6a by the mesh-shaped penetration hole. The fine filter 6b has a function of preventing solid matter, for example, dust, gravel, sand, and the like contained in rainwater from flowing into the infiltration portion 4 and preventing crushing of the crushed stone 2. Moreover, you may use the fine filter 6b of the raw material which has the function to adsorb | suck the oil etc. on the road contained in the rainwater which flows into the catchment tank 10, and to prevent the groundwater contamination by infiltration. The filter 6 is detachably attached to the upper opening portion of the permeation cylinder 5, and maintenance such as cleaning and replacement of the fine filter 6b can be easily performed.

  In FIG. 1, rainwater or the like flowing into the catchment basin from the inflow hole 13 of the catchment basin 10 is first stored in the mud reservoir 18 and discharged to the sewer through the attachment pipe 17 when the stored water level becomes high. When the amount of inflow increases and the stored water level exceeds the height of the filter 6, rainwater or the like passes through the filter 6 and flows into the infiltration portion 4 from the infiltration cylinder 5. And penetrates into the ground through the permeation sheet 3.

  The osmotic structure 1 may be provided in a water collecting basin 10 already installed in a predetermined place such as underground or may be provided in a water collecting basin 10 to be newly installed. And when providing the percolation structure 1 in the newly constructed water collecting basin 10, the through-hole 15 provided in the bottom wall 11 of the water collecting basin 10 is formed in advance before installing the water collecting basin 10 in the excavated place. You may do it. In this case, the hole 16 in which the infiltration portion 4 of the infiltration structure 1 is disposed can also be formed in advance at a position corresponding to the through hole 15 of the water collection tank 10 before installing the water collection tank 10.

  The shape of the hole 16 that can be formed in advance is not limited by the shape of the through-hole 15 formed in the water collecting basin 10 because it is before the water collecting basin 10 is installed. In addition, a hole 16 having a truncated cone shape or a quadrangular pyramid shape can be formed. Moreover, since the shape of the permeation | transmission part 4 provided in this hole 16 is formed according to the shape of the hole 16, similarly to the shape of the hole 16, for example other than cylindrical shape and polygonal column shape, It can be formed in the permeation part 4 having a truncated cone shape or a quadrangular pyramid shape. Thereby, the design head of the infiltration portion 4 and the infiltration area can be further increased, and the amount of rainwater infiltration into the ground can be increased.

  As the form of the water collection facility, in addition to the water collection tank described above, a water collection trench, a water collection side ditch, a water collection manhole, etc. can be cited, and a through hole is formed in these bottom walls to provide an infiltration structure. As a result, the same effect as in the case of the catchment can be obtained.

  Moreover, in the form mentioned above, although the osmosis | permeation structure 1 was provided in the bottom wall 11 of the catchment basin 10, it is not limited to this form, For example, the osmosis | permeation structure is provided in the side wall of the catchment basin 10 1 may be provided. When it is provided on the side wall, it is not necessary to extend the permeation cylinder 5 into the water collecting basin 10, so a through hole 15 is formed in the side wall, and the permeation part 4 extending in the horizontal direction from the through hole and the through hole 15 are formed. The osmotic structure 1 can be constituted by the filter 6 to be attached. The configurations of the permeation unit 4 and the filter 6 are the same as those described above.

Below, one form of the construction method of the osmotic structure 1 is demonstrated.
In this form, the water collection facility where the osmotic structure 1 is constructed is a facility already installed. Moreover, the water collecting basin 10 is used as a water collecting facility.
FIG. 4A is a view of the water collecting basin 10 as viewed from above, and FIG. 4B is a cross-sectional view taken along line EE in FIG. A through hole 15 having a diameter R1 (180 mm) is formed in the bottom wall 11 of the water collecting basin 10 by a core cutter. The numbers in parentheses are examples for comparing the sizes of members constituting the osmotic structure 1, and are not limited to these numbers (the same applies hereinafter). Further, the shape of the through hole 15 is not limited to a circular shape, and may be a polygonal shape. (End of step 1)

Next, a steel pipe 20 having the same shape as the through-hole 15 and having a diameter R2 (165 mm) is driven through the through-hole 15 into the ground vertically to a depth H1 (for example, 80 cm) (see FIG. 5). (End of step 2)
And the earth and sand to the depth H2 (for example, 50 cm) in the driven steel pipe 20 is sucked out with a suction device (see FIG. 6). (End of step 3)

Next, a PVC pipe 21 having a diameter R3 (125 mm) obtained by winding the submerged sheet 3 from the end in the insertion direction by a length H2 (50 cm) is inserted into the steel pipe 20 from which the earth and sand have been sucked out. The water-immersed sheet 3 is wound around the PVC pipe 21 so as to cover not only the side surface of the PVC pipe 21 but also the mouth side in the insertion direction (see FIG. 7). (Fourth step)
The crushed stone 2 is filled into the PVC pipe 21 around which the osmotic sheet 3 is wound from the insertion tip of the PVC pipe 21 to the length H2 (50 cm), that is, to the bottom surface position of the bottom wall 11 of the water collecting basin 10 (FIG. 8). (End of 5th step)

  Next, only the PVC pipe 21 of the PVC pipe 21 inserted into the steel pipe 20 and wound with the osmotic sheet 3 and filled with the crushed stone 2 is pulled out from the steel pipe 20, that is, the through hole 15 (see FIG. 9). ). And the upper surface of the crushed stone 2 is rolled from the upper opening of the steel pipe 20. (End of 5th step)

  Next, the steel pipe 20 driven into the ground is pulled out from the through hole 15 (see FIG. 10). When the position of the upper surface of the crushed stone 2 is sinking below the position of the bottom surface of the bottom wall 11 of the catchment basin 10, the insufficient amount of crushed stone 2 is filled from the through hole 15 and the upper surface of the crushed stone 2 is sufficiently covered. Compact. Here, for example, in a place where there is a high possibility that the filled crushed stone 2 will float up, such as a place where the ground is weak, a metallic member is used as a crushed stone levitation stop so that the crushed stone does not enter the water collecting basin 10. The crushed stone floating prevention means 7 is attached to the upper surface portion of the opening of the infiltration portion 4, that is, the upper surface portion of the filled crushed stone 2. Specifically, the metal rod 7 as a crushed stone rising prevention means is arranged below the through hole 15 so that both end portions of the metal rod 7 are hooked on the lower wall 11 which is the outer peripheral portion of the through hole 15. . The metal rod 7 is formed longer than the diameter of the through hole 15 and is disposed so as to cross the through hole 15. A plurality of metal rods 7 are arranged in a lattice shape, and the floating of the crushed stone 2 filled by the lattice of the metal rods, that is, the entry of the crushed stone into the through hole 15 is prevented. (End of step 6)

Next, a PVC pipe 5 ′ as an osmotic cylinder having a diameter R 4 (150 mm) is erected from the through hole 15 in the water collecting bowl 10. The lower end portion of the PVC pipe 5 ′ is fitted into the through hole 15 and is erected, and the PVC pipe 5 ′ is fixed to the water collecting bowl 10 by an adhesive means 23 such as mortar (see FIG. 11). A PVC pipe 5 ′ having the same shape as the through hole 15 is used. Moreover, the pipe to stand up is not limited to a PVC pipe, For example, a clay pipe, an iron pipe, etc. may be sufficient. The length H 3 of the PVC pipe 5 ′, that is, the height of the PVC pipe 5 extending upward in the water collecting tank 10 is set by the treatment method of the rainwater flowing into the water collecting pot 10. That is, it is determined whether rainwater is processed by the peak cut method or the base cut method, and the details thereof are as described in the explanation of FIG. (End of step 7)
And the filter 6 is installed in the upper opening part of the polyvinyl chloride pipe | tube 5 '. The filter 6 is detachably attached to the PVC pipe 5 ′ (see FIG. 12). (End of step 8)

As another form of the construction method of osmotic structure 1, the form in the case of newly installing a water collection facility is mentioned. In this case, the excavator for installing the water collection facility is performed manually or by an excavating machine as in the past.
Next, the formation of the through hole 15 in the bottom wall 11 of the water collecting basin 10 in the first step of the above-described form is performed in advance before the water collecting basin 10 is installed. Other specific construction contents are the same as those in the first step of the above-described embodiment. (End of step 1 ')

Next, the construction contents from the second step to the sixth step in the above-described form are as follows.
Before installing the catchment basin 10, the permeation part 4 (the permeation part described in FIG. 1) composed of the crushed stone 2 and the permeation sheet 3 at a position corresponding to the through hole 15 formed in the bottom wall 11 of the catchment basin 10. Hole 16 ′ for providing the same structure as that of FIG. (End of step 2 ')

  Next, the penetration part 4 is installed in the hole 16 '. The shape of the permeation part 4 can be formed in, for example, a circular truncated cone shape, a polygonal prism shape, a truncated cone shape, a quadrangular pyramid shape, or the like. Accordingly, in the second 2 ′ step, the hole 16 ′ may be formed in accordance with the size of the permeation portion 4 to be provided. However, the shape and size of the upper end portion of the permeation portion 4 disposed immediately below the through hole 15 of the water collecting basin 10 are the same as those of the through hole 15 so that water flowing out of the through hole 15 can permeate. It is desirable that they are substantially the same shape and size, or larger than the through hole 15. Thereby, the design head of the infiltration portion 4 and the infiltration area can be further increased, and the amount of rainwater infiltration into the ground can be increased. Arranging the crushed stone levitation preventing member 7 on the upper surface portion of the opening of the infiltration portion 4 is the same as the above-described embodiment. (End of step 3 ')

  Next, erecting the PVC pipe 5 ′ or the like as the permeation cylinder upward from the through hole 15 and installing the filter 6 at the upper opening of the PVC pipe 5 ′ or the like includes the seventh step and the The same as 8 steps.

It is a figure which shows one form of the osmosis | permeation structure which concerns on this invention, and shows sectional drawing of the state attached to the catchment basin. It is a figure which shows one form of the water collection facility where the osmosis | permeation structure which concerns on this invention is attached. (A) is a figure which shows the frame of the filter which comprises an osmosis | permeation structure, (b) is a figure which shows the fine filter provided in a filter. (A) is a top view of a catchment basin, (b) is a sectional view taken along line EE of (a), and is a diagram showing one step of the construction method of the seepage structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is sectional drawing of a catchment basin, and is a figure which shows 1 step of the construction method of an osmotic structure. It is a figure showing one form of conventional penetration facilities. It is a figure showing one form of conventional penetration facilities.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Penetration structure 2 Crushed stone 3 Penetration sheet 4 Penetration part 5 Penetration pipe | tube 5 'PVC pipe 6 Filter 7 Crushed stone levitation prevention means 10 Catchment 11 Bottom wall 15 Through-hole 16 Hole 20 Steel pipe 21 PVC pipe

Claims (4)

A penetration hole is formed in the bottom wall of a water collection facility including a water collecting trough, a water collection trench, a water collection side ditch, and a water collection manhole, and is provided vertically through the through hole into the water collection facility. A structure,
A crushed stone filled in a hole formed in the ground downward from the through hole of the bottom wall, and a permeation sheet disposed so as to surround the crushed stone and preventing inflow of earth and sand from the ground into the crushed stone. An infiltration section;
A permeation cylinder that is erected in the water collection facility upward from the through hole of the bottom wall and is fixed to the bottom wall of the water collection facility, and is made of a cylindrical material including a PVC pipe, a clay pipe, and an iron pipe;
An osmotic structure comprising: a detachable filter disposed so as to cover an upper opening of the osmotic tube.   The infiltration structure according to claim 1, wherein the infiltration portion has a vertically long shape.   The shape of the through-hole and the horizontal cross-sectional shape of the permeation part and the permeation cylinder have the same shape, and the shape is a circular shape or a polygonal shape. Osmotic structure. The shape of the hole formed in the ground downward from the through hole and the shape of the infiltration portion have a cylindrical shape, a truncated cone shape, or a quadrangular pyramid shape. The osmotic structure described in 1.

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