JP5182903B2 - Osmotic structure, water collecting facility with osmotic structure, and installation method of osmotic structure - Google Patents

Description

  The present invention relates to an infiltration structure for infiltrating rainwater and the like collected in a water collection facility such as a water collection tank, a water collection trench, a water collection side ditch, and a water collection manhole.

  Conventionally, in order to treat rainwater collected on a road, a parking lot, a ground, etc., a gutter is installed at an end of the road or the like. The rainwater that flows into the gutters collects rainwater in the rainwater basin and then drains it by connecting it to a main pipe such as a public rainwater pipe buried in the sidewalk or roadway, or penetrates it into a shallow position in the soil. A dredge is installed and drained by a method that allows rainwater to penetrate into the soil.

  With respect to a method of infiltrating rainwater into the soil, Patent Document 1 (Japanese Patent Laid-Open No. 2010-185222) discloses a permeation provided with a side groove for receiving rainwater and a permeation structure extending in a vertical direction having a rainwater inflow portion in the side groove. Regarding the side groove with a structure, it further includes a permeation tank into which rainwater in the side groove can flow, the side groove and the permeation tank are connected by a rainwater inflow pipe, and a connection portion of the rainwater inflow pipe to the side groove is There has been proposed a side groove with a permeable structure that is positioned higher than the rainwater inflow portion of the osmotic structure connected to the side groove. And in the side groove with the osmotic structure proposed in Patent Document 1, in the paragraph [0021] column for the osmotic structure, “The condition that the osmotic structure 30 has corrosion resistance and required compression resistance is provided. Can be made of any suitable material, examples of which include resin pipes, fiber reinforced resin pipes, and metal pipes such as stainless steel ".

  Further, the applicant of the present patent application is Patent Document 2 (Japanese Patent Laid-Open No. 2007-231734), which is an infiltration for improving an existing drainage facility for removing rainwater into a sewer or the like into an infiltration facility for allowing rainwater to penetrate underground. A structure is proposed. That is, in this patent document, there is an infiltration structure in which a through hole is formed in a bottom wall of a water collection facility such as a water collecting basin and is provided in the vertical direction from the ground to the water collection facility through the through hole. A crushed stone filled in a hole formed in the ground downward from the through hole of the bottom wall, and a water-permeable sheet disposed so as to surround the crushed stone and preventing inflow of earth and sand from the ground into the crushed stone And a permeation tube that is vertically installed in the water collection facility and is fixed to the bottom wall of the water collection facility, and includes a PVC pipe, a clay pipe, and an iron pipe. And an osmotic structure composed of a removable filter disposed to cover the upper opening of the osmotic tube.

JP 2010-185222 A JP 2007-231734 A

  As described above, methods for collecting rainwater and infiltrating it into the soil have been proposed in the past, and in order to carry out this method, it is necessary to install rainwater in a permeation trough, a gutter with a permeation structure, or an existing drainage facility. Infiltration structures have been proposed for improvement to infiltration facilities.

  However, in the methods proposed so far, infiltration in areas where the infiltration is not sufficient due to cohesive soil, etc. or in shallow locations, it may be possible that sufficient infiltration effects cannot be obtained due to saturation due to water content.

  Therefore, the present invention provides an infiltration structure that can reliably infiltrate even when the soil at the installation site is a viscous soil, etc., a water collection facility with the infiltration structure, and an installation method for the infiltration structure The first task is to do this.

  In addition, when installing an osmotic structure or the like in the depth direction in the soil before, a porous resin tube is used as the osmotic structure, but if it is a porous tube, It is conceivable that the roots of plants such as trees and grass enter into the holes for allowing water to pass through, so that the osmotic structure is deformed or damaged, or a sufficient osmotic effect cannot be exhibited.

  Therefore, in the present invention, an osmotic structure that prevents such deformation and breakage due to the roots of plants such as trees and grasses and solves the problem of decrease in osmotic capacity, a water collection facility with the osmotic structure, and an osmotic structure Providing a body installation method is a second problem.

  In addition, water collection facilities including water collecting troughs, water collecting trenches, water collecting side ditches, and water collecting manholes are often installed at the end of roads and parking lots. The osmotic structure provided in is subjected to earth pressure due to the passage of a vehicle or the like. When the infiltration structure embedded in the soil is subjected to earth pressure due to the passage of the vehicle, deformation or distortion may occur, and it may be impossible to exhibit the infiltration effect planned in the initial stage.

  Therefore, the present invention is an infiltration structure that is less susceptible to earth pressure due to the passage of such a vehicle and can maintain the initial infiltration capacity for a long period of time, and a water collection facility and an infiltration structure with the infiltration structure. The third problem is to provide an installation method.

  Moreover, most of the penetration capacity depends on the surface area of the osmotic structure and the design head (height), but there are problems such as securing the strength of surrounding buildings and roads, or the collapse of land and road surfaces. Therefore, it is difficult to widen in the planar direction, and a sufficient design head cannot be secured even if widened in the planar direction.

  Therefore, in the present invention, by setting the depth sufficiently in the depth direction, not only the volume and surface area of the osmotic structure but also the design head can be increased, and thus the osmotic capacity (penetration amount) is large and obstruction due to mud etc. It is a fourth object to provide an osmotic structure that is difficult to squeeze and that can maintain osmotic capacity over a long period of time, a water collection facility with the osmotic structure, and a method for installing the osmotic structure.

  And this invention can construct said osmosis | permeation structure and this water collection facility with a osmosis | permeation structure with sufficient workability with few processes, and eliminates a significant change also with respect to the existing water collection facility. It is a fifth object to provide an osmotic structure that can be installed, a water collection facility with the osmotic structure, and a method for installing the osmotic structure.

  In the present invention, attention is paid to forming the osmotic structure deeply, and at least one of the above problems is solved.

  That is, in the present invention, there is a rainwater inflow portion in a water collection facility including a water collecting trough, a water collection trench, a water collection side ditch, and a water collection manhole, and the infiltration is embedded in the soil extending in the depth direction of the installation location. The tubular member comprising a tubular member embedded at least to a depth of 1 m or more from the ground surface, and a penetrating portion housed in the tubular member and embedded deeper than the tubular member. There is no opening in the wall surface, and the permeation portion provides a permeation structure in which a bag-shaped member made of a water-permeable sheet is filled with crushed stone or other gravel material.

  The osmotic structure of the present invention has a rainwater inflow portion opened in the water collection facility, and includes a tubular member, and an osmotic portion accommodated in the tubular member and embedded deeper than the tubular member. Thus, the permeation part is composed of a bag-shaped member made of a water-permeable sheet and crushed stones and other gravel materials filled in the bag-shaped member.

  The tubular member is embedded at least to a depth of 1 m or more from the ground surface, and an infiltration portion in which a gravel material (crushed stone or the like) is filled in the bag-like member is accommodated in the internal space. It is buried to a deep position. In the infiltration structure configured as described above, rainwater that has flowed into the water collection facility can flow from the rainwater inflow portion into the tubular member, and can flow into the soil from the bag-like member through the gravel material of the infiltration portion. .

  The tubular member may be a metal tube in addition to a resin tube member such as a vinyl chloride tube, or may be a concrete tube formed in a tubular shape. However, it is desirable that the tubular member does not have an opening such as a permeation hole on its side surface. This is because when there is an opening, plant roots or the like enter and the permeation effect is reduced, and problems such as breakage and deformation occur. Rather, when the infiltration structure according to the present invention is effective in infiltrating rainwater into the lower layer when the upper layer is a viscous soil, the area buried in the viscous soil is originally. Since the osmotic effect is not achieved, no disadvantage is caused even if the opening is not formed on the side surface. However, when the region in which the tubular member is embedded is a stratum such as sandy ground that can perform a sufficient osmotic action, an opening such as a permeation hole can be formed on the side surface of the tubular member. The tubular member may have an elliptical shape or a polygonal shape such as a triangle or a quadrangle in addition to a circular cross-sectional shape intersecting the length direction thereof. Since this tubular member is inserted into a hole dug in the soil and pulled out, it is desirable that the side surface be provided with a structure for reducing friction with the soil. Further, since a plurality of the tubular members are connected in the length direction, the structural portion in which the adjacent tubular members are integrated with each other by screwing, joining, or the like at the axial end portion of each tubular member. For example, a member having a groove for screwing, for example, a spiral joint or the like can be used. When the earth pressure is large and difficult to pull out, it is possible to use a screwed spiral tube to cut and pull up the friction using the rotation of the auger.

  And in the said osmosis | permeation structure, it is desirable for the upper end opening of a tubular member to exist in the position higher than the bottom face in a water collection facility as a rainwater inflow part. This is to make it difficult for mud or the like to enter the tubular member and further the permeation portion.

  Moreover, it is desirable that a detachable filter is provided at the upper end opening of the tubular member. The main purpose of this filter is to prevent large debris such as plastic bags and fallen leaves from entering the infiltration structure and rainwater inflow pipe. desirable.

  And the penetration part accommodated in the pipe | tube of a tubular member is filled with the crushed stone and other gravel materials in the bag-shaped member which consists of a water-permeable sheet, and is embed | buried deeper than the said tubular member. Since this infiltration part functions to infiltrate rainwater flowing into the water collection facility into the soil, it is desirable that the infiltration part be buried as deep as possible. It is desirable to embed from the depth of the member to a depth deeper than the depth of the tubular member, that is, from the ground surface to a depth twice or more that of the tubular member. However, considering the balance of installation effort and effect, the depth of embedding the permeation part is at most about five times the depth of the tubular member from the ground surface. The bag-shaped member is formed by forming a water-permeable sheet into a bag shape. For example, a resinous porous sheet is formed into a bag shape, or a fabric such as a nonwoven fabric or a woven fabric is formed into a bag shape. Can be used. However, if the gravel material such as gravel and crushed stone is accommodated and the strength in the soil is taken into consideration, the hemp bag in which the hemp is formed in a bag shape can be used. It is desirable to use a bag made of or fabric. In addition, instead of the water-permeable sheet formed in a bag shape, a tube having a plurality of openings on the side surface can be used, and a permeation part configured using a tube having a plurality of openings formed on the side surface is used. The osmotic structure is technically equivalent to the present invention.

  In the infiltration structure according to the present invention, any part or all of the infiltration portion embedded in the soil is formed to be larger in the radial direction than the tubular member similarly embedded in the soil. It is desirable. For example, the horizontal cross-sectional area of the permeation part embedded in the soil is formed larger than the horizontal cross-sectional area of the tubular member embedded in the soil, or a part of the permeation part embedded in the soil is tubular It can be formed so as to protrude in the horizontal direction from the member. By forming in this way, the infiltration part can support the settling of the tubular member, and the infiltration part can be prevented from being pushed up to the ground by earth pressure or the like.

  In order to solve at least one of the above problems, the present invention provides a water collection facility with an osmotic structure in which the above osmotic structure is installed. That is, in the present invention, a water collection facility with a seepage structure having a catchment facility for receiving rainwater and a vertically extending seepage structure having a rainwater inflow portion in the lateral groove, A water collection facility with an osmotic structure using the osmotic structure according to the present invention is provided.

  In such a water collection facility with an osmotic structure, the osmotic structure according to the present invention is installed. Therefore, even if the osmotic structure is installed in a viscous soil area, rainwater is placed in the water flow layer below the viscous soil. Can be transmitted. Moreover, what is necessary is just to form the hole part which penetrates the said osmosis | permeation structure in the bottom face of the existing water collection facility in the case of installation of the osmosis | permeation structure concerning the said invention. That is, this water collection facility with an osmotic structure can also be realized by installing the osmotic structure according to the present invention with respect to existing equipment.

  And in this invention, in order to solve at least any one of the said subject, the method of installing the said osmosis | permeation structure simply and rapidly is provided.

  That is, in the present invention, while excavating the earth and sand, the first tubular member is inserted into the soil, and another tubular member is inserted in series with the tubular member inserted in front of it according to the excavated depth. After excavating to the depth, a bag-like member made of a water-permeable sheet is inserted into the continuous tubular member, and the bag-like member is filled with crushed stone or other gravel material to form an infiltrating portion. Provided is a method for installing an osmotic structure by pulling up a tubular member and exposing an upper end opening thereof.

  In such an installation method, the inner wall surface of the excavated hole collapses by inserting a predetermined tubular member into the excavated hole, such as a length of about 1 m, every time excavating while excavating earth and sand. Can be prevented. Then, after excavating to a predetermined depth such as the depth of embedding the infiltration part, a bag-like member is inserted into the tubular member continuously inserted, and gravel such as gravel and crushed stone is put into the bag-like member. Fill the material to form the penetrating part. And since this permeation part can hold a fixed shape against earth pressure by this filling, in order to secure the permeability from the side in the permeation part next, the inserted tubular member is sometimes Pull out and let the penetrating part touch the inner wall of the drilled hole. Then, all the tubular members other than the first tubular member first inserted into the excavation hole are pulled out, and the first tubular member is left in the soil, thereby constructing the osmotic structure according to the present invention described above. can do.

  This installation method of the osmotic structure can also be implemented when installing the osmotic structure in a water collection facility including a water catchment, a water collection trench, a water collection side ditch, and a water collection manhole. However, in this case, it is necessary to form an opening through which the tubular member is inserted on the bottom surface of the water collection facility. And when installing the permeation structure in the water collection facility, the first tubular member inserted into the soil is lifted so that its upper end exists above the bottom surface of the water collection facility. Is desirable. Further, the lifting of the first tubular member can be adjusted as appropriate so that the upper end of the opening selects a peak cut or a base cut in accordance with the attachment pipe from the bottom surface of the water collection facility to the main pipe. it can.

  Moreover, in the installation method of the osmotic structure according to the present invention, a string, a chain, or a wire is connected to the first tubular member, and the first tubular member is pulled up by the string, the chain, or It is desirable to carry out by pulling up the wire. Since the first tubular member is first inserted into the excavation hole, the other tubular member riding on the first tubular member can be lifted and pulled up by pulling out the first tubular member.

  And in the installation method of the osmotic structure according to the present invention, the excavation of the earth and sand is carried out using a screw auger (or a spiral auger) having an enlarged head attached to the tip, the screw auger passes through the tubular member, It is desirable that the excavated soil is scraped up through the tubular member. By using a screw auger having an enlarged head attached to the tip, the tubular member can be smoothly inserted into the soil, and also when the screw auger is pulled out from the tubular member, it can be carried out smoothly. In addition, when the earth and sand excavated by the screw auger are scraped up through the tubular member, for example, when an infiltration structure is provided on the bottom surface of the water collection facility, the collected soil and sand is not scattered in the water collection facility. Can be.

  In addition, a cylindrical earth removing device having an earth discharge port formed on the side surface is installed at the upper end of the screw auger, and the earth and sand scraped up through the tubular member is discharged from the earth discharge port. For example, the earth and sand generated by the excavation can be discharged to any location.

  According to the osmotic structure of the present invention configured as described above and the water collecting facility with the osmotic structure, since the osmotic part is embedded deeper than a tubular member of 1 m or more, it is assumed to be a viscous soil or the like. Even in areas where infiltration is not sufficient or in areas where water penetration is not possible due to saturation due to water content, etc. It is possible to provide an osmotic structure that can reliably penetrate, a water collection facility with the osmotic structure, and a method for installing the osmotic structure.

  Further, since the osmotic structure used in the present invention does not form holes or openings for passing water on the side surfaces, the roots of plants such as trees and grass do not enter the holes, and the osmotic structure To provide an osmotic structure capable of exhibiting a sufficient osmotic effect even after long-term use without deforming or damaging the body, a water collection facility with the osmotic structure, and a method for installing the osmotic structure Can do.

  And since the osmotic structure concerning this invention comprises the tubular member embed | buried 1 m or more in the soil, for example, the water catchment installed in the edge part of a road, a parking lot, a water collection trench, a water collection Even when installed in drainage facilities such as gutters and drainage manholes, there is no deformation or distortion due to earth pressure due to the passage of vehicles, etc. (that is, less susceptible to earth pressure due to the passage of vehicles) ), An osmotic structure capable of exhibiting the osmotic effect scheduled in the initial stage for a long time, a water collecting facility with the osmotic structure, and a method for installing the osmotic structure.

  Furthermore, the permeation part used in the present invention is deeply buried in the depth direction in the soil, and is not widely buried in the horizontal direction. Therefore, sufficient volume and surface area of the permeation structure can be secured while securing the strength of surrounding buildings and roads and solving problems such as land and road surface depression. And by ensuring sufficient volume and surface area of the osmotic structure, and increasing the design head (height), the osmotic capacity (penetration amount) is large and it is difficult to block by mud, etc. Can be provided, a water collecting facility with the osmotic structure, and a method for installing the osmotic structure.

  And the osmotic structure concerning this invention can be constructed | assembled with few work processes with sufficient workability | operativity, and can be installed without a significant change also to the existing water collection facility.

Sectional drawing which shows one form of water collection facilities, such as a water collection tank which installed the osmosis | permeation structure concerning this Embodiment. The schematic diagram which shows the excavation work from the through-hole formed in the bottom face of the existing catchment. Furthermore, the schematic which shows the state which excavated. The schematic diagram which shows the additional work of the screw auger and the PVC pipe to which the screw auger and the PVC pipe are added. The schematic diagram which shows the excavation state in the screw auger and the PVC pipe which were added. Furthermore, the schematic which shows the state which excavated by implementing the additional work of a screw auger and a PVC pipe. The schematic diagram which shows the removal process which pulls out a slide auger, and the bag-shaped member installation operation | work which inserts a bag-shaped member in the remaining polyvinyl chloride pipe | tube. The schematic diagram which shows the PVC pipe extraction operation | work which pulls out the inserted PVC pipe in order from a lower side, filling and rolling a crushed stone in the bag-shaped member inserted in the PVC pipe. The schematic diagram which shows the state which filled and rolled the crushed stone further in the bag-shaped member. The schematic diagram which shows the state which cut | disconnected the upper part of the tubular member and installed the rain filter in the upper end.

  Hereinafter, a method for installing an osmotic structure according to a specific embodiment, an osmotic structure installed by this method, and a water collection facility where the osmotic structure is installed will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an embodiment of a water collection facility such as a water collection basin 10 provided with an infiltration structure according to the present embodiment. The infiltration structure 1 is a structure for infiltrating the water collected in the water collection facility such as a gutter into the ground, and is provided at the bottom 11 of the water collection facility. The catchment basin 10 is mainly used as a catchment facility that collects 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 through which the air flows when it flows is provided.

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

  The infiltration structure 1 has a rainwater inflow portion in the water collecting basin 10 and extends through the through hole 15 to the ground. The osmotic structure 1 includes a tubular member 5 having an upper end opening in the water collecting basin 10 and embedded in the depth direction from the through hole 15 into the underground, and is accommodated in the tubular member 5, and the tubular member The permeation part 4 is embedded deeper than that, and the filter 6 is disposed so as to cover the upper opening of the tubular member 5. And the shape of the through-hole 15 and the horizontal cross-sectional shape of the penetration part 4 and the tubular member 5 have the same shape.

  The infiltration portion 4 is configured by containing a gravel material 2 such as crushed stone in a bag-shaped member 3 formed of a water-permeable sheet, and the bag-shaped member 3 has a function of holding crushed stone filled therein. Have And the hole 16 which embeds this permeation | transmission part and the tubular member 5 is formed in the vertically long shape directly below the through-hole 15, and perpendicularly downward. The hole 16 is excavated by using a screw auger as will be described later. For example, a steel pipe having the same shape as the through-hole 15 is driven into the ground through the through-hole 15 and the earth and sand in the steel pipe is sucked out by a suction machine or the like. May be. 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.

  And by making the horizontal cross-sectional area of the permeation portion 4 larger than the horizontal cross-sectional area of the tubular member 5, the permeation portion 4 and further the gravel material 2 filled in the bag-like member 3 is prevented from floating. be able to.

As the crushed stone 2 filled in the bag-shaped member 3, 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 bag-like member 3 is laid so as to wrap the crushed stone 2 at the boundary surface between the underground (earth and sand) which is the permeation layer and the crushed stone 2, and prevents the sand and sand from the permeation layer from flowing into the crushed stone 2 and the road surface. And prevent sinking and sinking of the seepage layer. As the water-permeable sheet constituting the bag-like member 3, use 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. . 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 can be used. In order to withstand the pressure at the time of rolling of crushed stone, a thickness of 3 mm or more is desirable. Moreover, the material of a water-permeable sheet can use synthetic resin sheets, such as polyester and a polypropylene, and natural resin sheets, such as hemp. Note that the crushed stone 2 can be different in size, material, and the like depending on what is present in the tubular member 5 and what is present in the infiltration portion 4.

  The tubular member 5 that protrudes upward from the through-hole 15 and exists in the water collecting basin 10 has a lower side passing through the through-hole 15 and is fixed at the bottom 11 of the water collecting basin 10 with mortar or the like. . The shape of the tubular member 5 has the same shape as the through hole 15 formed in the bottom part 11 of the water collecting basin 10. For example, it is comprised from cylindrical things, such as a vinyl chloride pipe 36, a clay pipe, and an iron pipe. The total length of the tubular member 5, that is, the length of the portion extending upward from the bottom 11 of the water collecting basin 10 and the portion embedded in the soil through the through hole Is preferably 50 cm or more, so that the osmotic structure 1 that is not deformed by the earth pressure when the vehicle passes through the road surface can be obtained. Thereby, when the bottom 11 of the water collecting basin 10 exists at a depth of 50 cm from the ground surface, the tubular member 5 can be embedded to a depth of 1 m or more from the ground surface.

  The length (height) of the tubular member 5 that extends upward from the bottom 11 of the water collecting basin 10 into the water collecting basin 10 is a peak cut of rainwater flowing into the water collecting basin 10. It can be determined depending on whether the processing is performed by the method or the base cut method. That is, whether the rainwater that has flowed in is processed by the peak cut method or the base cut method is selected by adjusting the length (height) of the tubular member 5 from the bottom 11 of the water collecting basin 10. can do.

  Here, the peak cut method means that when the initial amount of rain or the amount of inflow of rainwater is small, draining rainwater or the like through the attachment pipe 17 to the main pipe such as a sewer pipe, and the amount of inflow exceeds the increased water level, 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 main pipe such as a sewer pipe through the attachment pipe 17. 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 may be a filter frame formed in a mesh shape and a fine filter disposed in the filter frame. When a mesh-like permeation hole is formed in the filter frame and a fine filter is fixed in the filter frame, the mesh-like permeation hole can prevent a large amount of dust from flowing into the filter frame. The contained solid matter, for example, dust, gravel, sand and the like can be prevented from flowing into the infiltration portion 4 and clogging of the crushed stone 2 can be prevented. Further, a fine filter that adsorbs oil and the like on the road contained in rainwater flowing into the water collecting basin 10 and prevents groundwater contamination due to infiltration may be used. The filter 6 is detachably attached to the upper opening of the tubular member 5, and maintenance such as cleaning and replacement of the fine filter can be easily performed.

  FIG. 1 is configured to treat rainwater and the like by a peak cut method. Rainwater and the like flowing into the catchment basin from the inflow hole of the catchment basin 10 are first stored in the mud reservoir 18 and stored water level. Becomes higher, it is discharged to the sewer through the attachment pipe 17. 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 tubular member 5. And penetrates into the ground through the permeation sheet. However, it is of course possible to adopt a base cut method by adjusting the height of the filter 6 and the installation height of the mounting pipe 17.

  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 infiltration structure 1 in the newly constructed water collecting basin 10, the through-hole 15 provided in the bottom part 11 of the water collecting basin 10 is formed in advance before installing the water collecting basin 10 at the location where the water basin 10 is excavated. It may be. 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, it is possible to form a hole 16 having a truncated cone shape or a quadrangular pyramid shape. 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 osmotic structure 1 was provided in the bottom part 11 of the catchment basin 10, it is not limited to this form, For example, the osmotic structure 1 is provided in the side wall of the catchment basin 10 May be provided. When it is provided on the side wall, it is not necessary to extend the tubular member 5 part into the water collecting basin 10, so a through hole 15 is formed in the side wall, and the penetrating 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.

  Next, an embodiment of a method for installing the osmotic structure 1 as described above will be described with reference to FIGS. In particular, this embodiment shows an example in which the osmotic structure 1 is constructed for a water collection facility that has already been installed, and a water collecting basin 10 is used as the water collection facility.

  First, the through-hole 15 for installing the osmotic structure 1 is formed in the bottom face of the existing water collecting basin 10, and the excavation work of the hole 16 is implemented here. For example, as shown in this embodiment, the hole 16 is excavated by using a backhoe 30 with hydraulic piping, a slide auger 32 attached thereto, and a screw auger 34 attached to the slide auger 32. can do. That is, the excavation work can be performed by gradually lowering the screw auger 34 with the slide auger 32 while excavating with the screw auger 34.

  The screw auger 34 has an outer diameter of 180 mm and a length of 1500 mm, and an enlarged head (not shown) having an outer diameter of about 250 mm is provided at the tip. A PVC pipe 36 having an inner diameter of 200 mm and a length of 1500 mm is provided outside the screw auger 34. That is, the screw auger 34 is provided so as to pass through the PVC pipe 36. The PVC pipe 36 provided outside the screw auger 34 finally constitutes a tubular member. Further, wires 35 are attached to three positions on the upper end side of the tubular member. By providing the wires 35, the tubular member inserted into the hole 16 can be pulled out.

  With such a configuration, as shown in FIG. 2, excavation by a screw auger 34 having a length of 1500 mm and insertion of a PVC pipe 36 having a length of 1500 mm are performed. During excavation work, the residual soil dug by the screw auger 34 is lifted through the inside of the PVC pipe 36, and this is discharged outside by a soil removal device 37 provided at the upper end of the PVC pipe 36 (see FIG. 3). . After being dug up sufficiently, the PVC auger 34 having an outer diameter of 180 mm and a length of 1000 mm is added to the excavated screw auger 34 and inserted into the hole 16. An additional operation of the screw auger 34 and the polyvinyl chloride pipe 36 is carried out by adding the polyvinyl chloride pipe 36 having an outer diameter of 200 mm and a length of 1000 mm to the pipe 36. In carrying out this additional work, the motor portion is raised by the slide auger 32 to form a gap between the screw auger 34 inserted into the soil and the upper end of the PVC pipe 36, and the additional screw auger 34 is provided here. A PVC pipe 36 can be installed. If the combination of the ends of the PVC pipe 36 is not stable, the outside of the connecting part can be connected to the outer side of the connecting part with a cylindrical collar or an adhesive tape, if necessary. It is. Moreover, the tubular member which has a spiral joint which can also integrate adjacent tubular members by screwing etc. as a tubular member can also be used.

  Then, as shown in FIGS. 5 and 6, an additional operation of the screw auger 34 and the PVC pipe 36 is performed as described above, and this operation is performed to a depth where the osmotic layer exists at the installation location. In this additional work, the screw auger 34 and the PVC pipe 36 having a length of 1000 mm are added. However, the length is not limited to this, and various lengths such as the 1500 mm screw auger 34 and the PVC pipe 36 are used. It is also possible to use a combination of different lengths.

  Then, after performing excavation work while performing additional work up to the required depth, that is, the depth where the permeation layer exists, as shown in FIG. 7, the PVC pipe 36 inserted into the hole 16 is left as it is. All the screw augers 34 including the screw auger 34 are pulled out and removed. And it is confirmed by vacuum etc. whether it reached to a water-permeable layer.

  After confirming that the water-permeable layer has been reached, a bag-like member installation operation is performed in which the bag-like member 3 made of a water-permeable sheet is inserted into the PVC pipe 36 left in the hole 16. When installing the bag-shaped member, the bottom of the bag is filled with crushed stone or the like, so that the weight can reach the bottom of the hole 16. And after inserting this bag-shaped member in the polyvinyl chloride pipe 36, the said polyvinyl chloride pipe 36 is filled with the crushed stone of No. 5 or No. 6 further in the said bag-shaped member, and this is pressed, and the inserted polyvinyl chloride pipe 36 is sequentially from the lower side. Pulling out the PVC pipe 36 is performed (see FIG. 8). In carrying out the operation of pulling out the PVC pipe 36, the PVC pipe 36 riding on the first inserted PVC pipe 36 is also lifted by pulling up the three wires 35 provided on the first inserted PVC pipe 36. This makes it possible to pull out sequentially. And the crushed stone is filled also in the bag-shaped member which exists in the polyvinyl chloride pipe | tube 36 inserted initially, and it rolls (refer FIG. 9). The PVC pipe 36 can be lifted or pulled out using a slide auger device. Further, instead of the PVC pipe, a screw-in spiral pipe can be used as the tubular member. For example, if the tubular member is difficult to pull out due to high earth pressure or clay and high frictional resistance, use a screwed spiral tube to cut the friction with the soil using the rotation of the auger. It can also be raised.

  By pulling out the polyvinyl chloride pipe 36, the permeation portion 4 having a necessary length (depth) is formed on the lower side of the hole 16, and the polyvinyl chloride pipe 36 remaining in the hole 16 is hit and stabilized. The PVC pipe 36 left in the soil exists as a tubular member 5 in a clayey layer, and functions as a member that resists the earth pressure of a vehicle traveling on the road surface and prevents the intrusion of plant roots and the like. be able to. The gap in the hole 16 existing outside the tubular member 5 is filled with sand and compacted with water. The upper portion of the PVC pipe 36 (tubular member 5), that is, the upper portion of the installed tubular member 5 is Then, it is cut out from the bottom 11 of the water collecting basin 10 so as to have a predetermined height. Then, the crushed stone is filled up to a predetermined height of the region existing in the tubular member 5 in the bag-like member 3, and the outside of the tubular member 5 is fixed to the bottom 11 of the water collecting bowl 10 with mortar or the like. A rain filter 6 is installed at the upper end (see FIG. 10).

  Through the installation method of the osmotic structure as described above, the osmotic structure can be easily installed even in existing water collection facilities, especially when the water collection facility is installed in a clayey place. However, excavation can be carried out up to the water permeable layer below, and the osmotic structure can be easily installed.

1 Penetration structure 2 Gravel material (crushed stone)
DESCRIPTION OF SYMBOLS 3 Bag-like member 4 Penetration part 5 Tubular member 6 Filter 10 Catchment basin 11 Bottom part 12 Catchment culm lid 15 Through hole 16 Hole 17 Mounting pipe 18 Mud storage part 30 Backhoe 32 Slide auger 34 Screw auger 35 Wire 36 Vinyl chloride pipe 37 Exhaust Earth device

Claims (6)

An infiltration structure that has a rainwater inflow section in a water collection facility including a water collection trough, a water collection trench, a water collection ditch, and a water collection manhole, and extends in the depth direction of the installation location and is embedded in the soil,
A tubular member embedded at least to a depth of 1 m or more from the ground surface, and a penetrating portion housed in the tubular member and embedded deeper than the tubular member,
There is no opening on the wall surface of the tubular member,
The infiltration part is configured by filling crushed stone or other gravel material in a bag-shaped member made of a water-permeable sheet ,
The infiltration structure according to claim 1, wherein a horizontal cross-sectional area of the infiltrating portion embedded in the soil is larger than a horizontal cross-sectional area of a tubular member embedded in the soil .
The upper end opening of the tubular member exists at a position higher than the bottom surface in the water collection facility as a rainwater inflow portion,
Its upper end opening, a removable filter is provided, penetrating structure according to claim 1.
A water collection facility with a seepage structure comprising a catchment facility that accepts rainwater and a vertically extending seepage structure having a rainwater inflow portion in the gutter,
The osmotic structure is a water collection facility with an osmotic structure, which is the osmotic structure according to claim 1.
While excavating the earth and sand, the first tubular member is inserted into the soil, and another tubular member is inserted in accordance with the excavated depth, connected to the tubular member inserted before,
After excavating to a desired depth, a bag-like member made of a permeation sheet is inserted into a continuous tubular member, and the bag-like member is filled with crushed stone or other gravel material to form a permeation portion. An installation method for an osmotic structure, wherein one tubular member is pulled up to expose an upper end opening thereof.
A string, a chain, or a wire is connected to the first tubular member,
The installation method of the osmotic structure according to claim 4, wherein the first tubular member is pulled up by pulling up the string, chain, or wire.
The excavation of the earth and sand is carried out using a screw auger with an expansion head attached to the tip,
The screw auger passes through the tubular member, and the excavated earth and sand is scraped up through the tubular member,
The earth and sand scraped up through the inside of the tubular member is discharged from an earth discharge port formed on a side surface of a cylindrical earth discharging device provided at an upper end of the screw auger. How to install the osmotic structure.