JP7007235B2 - How to use the drain pipe - Google Patents

Description

The present invention relates to a method of using a drain pipe in which a drain pipe for constructing a vertical rainwater infiltration facility is arranged so that an impermeable portion crosses an underground submerged water vein layer.

In recent years, due to the influence of abnormal weather around the world, the frequency of rainfall exceeding 60 mm per hour tends to increase in Japan. In addition, urbanization is taking place at a rapid pace, and as a result, the stormwater infiltration function is declining from the ground surface, and urban floods are occurring frequently. For this reason, the development and introduction of rainwater storage and infiltration facilities are underway. As for rainwater infiltration facilities, facilities that infiltrate in the ground relatively close to the ground surface are the mainstream, and in order to secure a larger amount of infiltration, the facilities tend to be larger.

For example, Japanese Patent Application Laid-Open No. 2015-183494 includes a rainwater storage and infiltration tank 10 that collects rainwater underground and has a water permeability layer G2 underneath the impervious layer G1 and also allows the rainwater to flow out or permeate into the ground. The 10 is provided with a plurality of infiltration wells 20 connected to the permeable layer G2, and the rainwater storage infiltration tank 10 is provided with a through hole 13 through which the infiltration well 20 is inserted. The permeation well 20 has a gap S2 between them, and the penetrating well 20 has a double pipe structure consisting of an outer pipe 21 and an inner pipe 22 having a plurality of through holes formed on the peripheral surface, and the outer pipe 21 and the inner pipe 22 are connected to each other. A stormwater storage and infiltration facility 1 having a structure in which a permeable sheet 23 is arranged between them is disclosed. According to the rainwater storage and infiltration equipment 1, the rainwater storage and infiltration tank can be applied to the ground where the groundwater level is high, and can be easily installed by a simple configuration.

On the other hand, vertical rainwater infiltration facilities for the purpose of saving space in rainwater infiltration facilities are attracting attention. As such a vertical rainwater infiltration facility, the drain pipe shown in FIGS. 9 and 10 is known. This drain pipe is a technique for constructing a vertical rainwater infiltration facility 100 by burying a perforated cylindrical pipe (drain pipe resin skeleton) 102 made of polypropylene having an inner diameter of 85 mm containing a water permeable sheet 103 in the ground. In the vertical rainwater infiltration facility 100, in order to bury the drain pipe resin skeleton 102 in the ground, for example, first, an underground excavation device equipped with an auger screw is used, and the drain pipe resin skeleton 102 is underground. A drill hole with an inner diameter larger than the outer diameter is formed. Next, the drain pipe resin skeleton 102 is inserted from the ground surface into the formed excavation hole and constructed. Another method is to build the casing in advance, discharge the earth and sand in the casing to the ground surface with a drill with spiral blades, insert a drain pipe into the casing, and then pull out the casing. After the drain pipe resin skeleton 102 is built in the ground, the coarse washing sand (backfill material) 104 is backfilled in the gap around the drain pipe resin skeleton 102. This prevents the clay surrounding soil from adhering and deteriorating the permeation function of the permeation surface. According to this construction method, by extending the drain pipe in the depth direction, it is possible to expand the permeation area without expanding the facility occupied area above the ground, and a high design head can be obtained, and the permeation facility can be obtained. Space can be saved. In addition, even if the ground near the ground surface is unsuitable for infiltration, it can be applied by extending the infiltration facility to the infiltration target layer. In addition, since a cavity having a diameter of 85 mm can be secured inside, the storage amount per unit volume is larger than that of the conventional infiltration facility filled with crushed stone. In FIG. 9, reference numeral A is unsuitable ground for permeation, B is suitable ground for permeation, 108 is rainwater, 107 is an upper filter, 106 is a PVC pipe, and 105 is a joint. The drain pipe main body 101 is located in the ground suitable for penetration in the drain pipe.

Japanese Unexamined Patent Publication No. 2015-183493

However, if a permeable drain pipe is built so as to cross the underground underground water vein layer in the ground, rainwater or the like flows into the underground underground water through the drain pipe. This can cause changes in the quality of underground underground water. Therefore, there has been a demand for a method of using a drain pipe that does not flow into an underground underground water vein even if rainwater or the like on the ground flows into the drain pipe. In addition, there has been a demand for a method of using a drain pipe that does not require a backfill material, is easy to insert into the center of the excavation hole, and can be inserted accurately to a planned depth.

Therefore, an object of the present invention is to provide a method of using a drain pipe that does not flow into an underground underground water vein even if rainwater or the like on the ground flows into the drain pipe.

That is, the present invention solves the above-mentioned problems, and is a method of using a drain pipe for permeating rainwater or the like. It provides a method of using a drain pipe, which is characterized by being arranged so as to cross.

Further, the present invention is characterized in that the drain pipe includes a tubular drain pipe resin skeleton and a resin block body disposed outside the drain pipe resin skeleton. Is to provide.

The present invention is characterized in that the resin block body is a combination of a water permeable resin block body and an impermeable resin block body, and the impermeable portion is an impermeable resin block body. It provides a method of using a drain pipe.

The present invention also provides a method of using the drain tube, wherein the water-permeable resin block body is a water-permeable porous body.

The present invention also provides a method of using the drain tube, wherein the resin block body is a cylindrical body or an assembled cylindrical body of a half-split cylindrical body.

According to the present invention, even if rainwater or the like on the ground flows into the drain pipe, it does not directly flow into the underground underground water vein. Therefore, it is possible to prevent the quality of underground underground water from changing due to the inflow of rainwater or the like as much as possible.

It is a figure which shows the use example of the drain pipe in embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line XX of FIG. It is a simplified view of the drain pipe main body of FIG. (A) is an enlarged partial cross-sectional view of the tip of the drain pipe of FIG. 1, (B) is a cross-sectional view of a resin block body, and (C) is a cross-sectional view of an H-shaped joint socket. D) is a cross-sectional view of the retaining plate. It is sectional drawing explaining the assembled state of the tip side of the drain pipe of FIG. It is sectional drawing explaining the assembly state of the surface side of the drain pipe of FIG. It is a figure which shows the use example of the drain pipe in another embodiment of this invention. It is a figure which shows the modification of the joint socket. It is a figure which shows the use example of the conventional drain pipe. 9 is a cross-sectional view taken along the line YY in FIG.

In the present invention, the drain pipe has a water-permeable portion and a water-permeable portion, and rainwater or the like from the ground is permeated from the water-permeable portion, and rainwater or the like is not permeated from the impermeable portion. The drain pipe includes a tubular drain pipe resin skeleton (hereinafter, also simply referred to as “resin skeleton”) and a resin block body arranged on the outer peripheral side of the resin skeleton, and both the resin skeleton and the resin block body are provided. , A plurality of pieces in the vertical direction are connected or supported in series by a joint socket or a fastening plate (flame). The resin skeleton and the resin block body are not limited to the same length and may be different. That is, the number of resin skeletons and resin block bodies used may be the same or different. In addition to rainwater, rainwater and the like refer to domestic wastewater in undeveloped areas of this sewage, spring water from the mountain surface, etc. that flow into the ground surface other than rainwater.

In the present invention, the resin skeleton constituting the drain pipe is cylindrical, and a large number of through holes through which water can escape are formed on the outer peripheral surface of the cylinder. The resin skeleton preferably has sufficient strength against a horizontal load received in the soil and the amount of strain generated by the earth pressure acting for a long period of time is sufficiently small. A vinyl tube or the like can be used. Usually, two or more resin skeletons are connected in series in the vertical direction. The length of one resin skeleton is 150 to 500 mm, preferably 200 to 300 mm. Further, the outer diameter of the resin skeleton is appropriately determined to be 50 mm or more. As the resin skeleton corresponding to the impermeable portion, for example, an impermeable resin skeleton such as a vinyl chloride pipe may be used.

In the drain pipe, a plurality of resin block bodies are prepared, and these are continuously connected in series in the vertical direction. Two resin blocks vertically adjacent to each other in the vertical direction (longitudinal direction) are supported by a joint socket or a fastener of a joint socket with a fastener. The resin block body may be a cylinder in which a pair of left and right half-split cylinders are assembled, or a cylinder in which a through hole into which a resin skeleton fits is formed in a central portion. When the number of the resin skeleton and the resin block body is the same, it is preferable that the height dimension H ₁ of the resin block body before assembly is slightly larger than the height dimension H ₂ of the resin block body after attachment to the resin skeleton. .. That is, after the resin block body is attached to the resin skeleton, the height dimension is reduced by compression fixing of the fastening plate.

Examples of the resin block body include a water permeable resin block body which is a water permeable part and an impermeable resin block body which is a water permeable part. In the present invention, the impermeable resin block body is built so as to cross the underground underground water vein, and the water permeable resin block body is built so as to cross the ground other than the underground underground water vein. As a result, it is possible to prevent rainwater or the like on the ground from directly flowing into the groundwater through the drain pipe, and it is possible to prevent deterioration of the groundwater quality. Examples of the impermeable resin block body include Styrofoam. In the drain pipe of the present invention, it is not always necessary to form a resin block body around the resin skeleton. If so, the use of the resin block body can be omitted.

Examples of the water-permeable resin block body include a water-permeable porous body. The water-permeable porous body has a monolithic shape having continuous pores inside, and has a hardness that can be easily cut with a saw or the like. The physical properties of the permeable porous material include, for example, a density of 14.6 to 26 kg / cm ³ , a porosity of 17 to 18%, a bending strength (JIS A 9511) of 4.2 to 18.6 N / cm ² , and a strain of 10%. The compression strength is 5.6 to 12.8 N / cm, and the hydraulic conductivity (JIS A 1218) is 0.1 cm / sec. Such a permeable porous body has sufficient compression resistance to withstand earth pressure. Commercially available products can be used as the water-permeable porous material. A large number of notched recesses for storing water may be formed on the inner surface of the water-permeable resin block body. This increases the amount of water stored. Further, the notch recess may be formed in a spiral shape. This makes it possible to increase the amount of water stored while maintaining the strength of the resin block body.

In the present invention, the plurality of resin skeletons and resin block bodies are connected or supported by, for example, a joint socket with a retaining plate. Joint sockets with fastening plates are those in which a disk-shaped fastening plate is screwed into a screw formed on the outer peripheral surface of the joint socket (screw type socket), and the fastening plate is in the axial direction of the tubular joint socket. An example is one that is integrally attached to the end (integrated socket).

In the screw type socket, the resin skeleton is connected by the joint socket, and the resin block is compressed and fixed by the fastening plate. In the integrated socket, the resin skeleton is connected by a joint socket, and the resin block is supported by sandwiching the resin block from both ends with a retaining plate.

Among the screw type sockets, the joint sockets for connecting the resin skeleton include a substantially H-type socket having an annular inner wall having a central through hole (hereinafter, also simply referred to as “H-type socket”) and a sleeve type without an inner wall. Sockets and the like. Male screws for screwing the fastening plate (flange) for supporting the resin block body are formed on the outer peripheral surfaces of the H-type socket and the sleeve-type socket. Further, a female screw to be screwed with a male screw of the resin skeleton may be formed on the inner peripheral surface thereof.

The H-shaped socket consists of a cylindrical socket body and an annular inner wall (flange) that protrudes toward the center of the axis at approximately the center of the socket body in the longitudinal direction. Is. Then, one end surface of the cylindrical resin skeleton inserted from one opening abuts on one surface of the inner wall, and one end surface of the cylindrical resin skeleton inserted from the other opening is the other surface of the inner wall. The two resin skeletons are connected by abutting with. Examples of the method for fixing the socket body and the resin skeleton include fixing with screws, fixing with an adhesive, and fixing with screws.

The sleeve type socket is the H-shaped socket in which the inner wall is omitted. That is, in the sleeve type socket, two resin skeletons can be connected at any position in the longitudinal direction inside the socket body, and can be attached at any position of one resin skeleton, and two resin blocks can be attached. The body can be connected. Similarly, examples of the method for fixing the socket body and the resin skeleton include fixing with screws, fixing with an adhesive, and fixing with screws.

As shown in FIG. 8, the integrated socket is an annular shape that is integrally attached to one end of a short cylindrical main body 41 and an outer peripheral surface of the main body 41 in the axial direction (direction orthogonal to the diameter) and projects outward. It has a flange portion 51 of the above, and the resin skeleton is fitted from both sides, and the flange portion 51 supports the resin block body 3 (3a, 3b) so as to sandwich the resin block body 3 (3a, 3b) from both sides. In this case, the resin block body 3 is not compressed and fixed. Further, the resin block body 3a may be cylindrical and does not require notches at the upper and lower ends.

Among the joint sockets with fasteners, those in which the fasteners are screwed into the joint socket body with screws are preferable. That is, in the joint socket with a fastening plate, the resin skeleton is fitted and connected by the socket body, and the resin block body is compressed and fixed (supported) by the fastening plate. As a result, the resin block body can be closely fixed and a strong drain tube can be obtained. The screw on the outer peripheral surface formed on the socket body may be the entire outer peripheral surface or, for example, a part of the central portion in the vertical direction. The retaining plate is a disk-shaped one having a through hole formed in the center and has a slightly thin thickness, and the outer diameter is the same as or slightly smaller than the outer diameter (overall diameter) of the drain pipe. Further, a female screw is formed on the inner circumference of the through hole in the center of the retaining plate. This allows it to be screwed into the fitting socket.

In a joint socket with a fastening plate in which the fastening plate is screwed by a screw, the number of fastening plates can be two. As a result, the lower retaining plate compresses and fixes the lower resin block body, and the upper fastening plate compresses and fixes the upper resin block body. As a result, in the case of one retaining plate, when the lower resin block body is compressed and fixed, the size may be insufficient to support the upper resin block body having the same dimensions as the lower resin block body. By using two fastening plates, the plurality of resin block bodies may all have the same dimensions, and all of them can be compressed and fixed. Moreover, since the compression rate can be arbitrarily determined, the water permeation rate can be freely set.

Next, a method of using the drain pipe in the embodiment of the present invention will be described with reference to FIGS. 1 to 6. As shown in FIG. 1, the rainwater infiltration facility 10A includes a drain pipe 10, and the drain pipe 10 includes a drain pipe main body 1 constructed in the ground and an upper filter cueed into the rainwater basin 8. 7. It has a joint 6c for connecting the drain pipe main body 1 and the upper filter 7.

The drain pipe main body 1 has a cylindrical resin skeleton 2 and 2a to 2c having a large number of drain holes 21 formed on the peripheral surface thereof, and a resin block body 3 arranged on the outer peripheral side of the resin skeletons 2 and 2a to 2c. It has 3a to 3c. As the resin skeleton and the resin block body, those having substantially the same length are prepared and connected in series. One resin block body 3 is a cylindrical body having a central through hole into which the resin skeleton 2 fits, and a notch into which the joint socket 4 fits is formed around the upper end of the through hole (FIG. 4B). ). In the drain pipe main body 1, the first resin skeleton 2 is arranged between the end cap 9 and the first joint socket 4 of the H-shaped socket 6 with the first retaining plate (FIG. 4A). The first joint socket 4 has a partial partition wall 42 formed at an intermediate position in the length direction of the short cylindrical body 41 through a central portion for partitioning the upper and lower chambers 43 and 44, and has a substantially H-shaped cross section. (Fig. 4 (C)). As a result, rainwater or the like can flow down or be held in the drain pipe, and the end position of the first resin skeleton 2 can be held. The method of fixing the first joint socket 4 and the first resin skeleton 2 is not particularly limited, and examples thereof include screw fixing and adhesive fixing. In this example, adhesive fixing is performed by an adhesive. Further, a male screw 45 is formed on the outer peripheral surface of the short cylindrical body 41 of the first joint socket 4. Further, the first fastening plate 5 is a disk-shaped collar having a through hole 52 formed in the center, and a female screw 53 is formed on the inner peripheral surface of the through hole 52 (FIG. 4 (D)). .. As a result, the first fastening plate 5 is joined to the outer peripheral surface of the joint socket 4 by screwing.

In the drain pipe main body 1, the first resin block body 3 is compression-fixed between the end cap 9 and the first fastening plate 5 of the H-shaped socket 6 with the first fastening plate. That is, the first resin skeleton 2 is fitted between the end cap 9 and the first joint socket 4, and the first resin block body 3 arranged around the first resin skeleton 2 is screwed into the first joint socket 4. It is compressed and fixed by the matching first fastening plate 5 (FIG. 4 (A)). As a result, the first resin block body 3 is firmly fixed to the end cap 9 and the first fastening plate 5, so that the strength is high. The first resin block body 3 is a water-permeable resin block body.

In the drain pipe main body 1, the tip end portion (lower end portion) of the second resin skeleton 2a is fitted into the chamber on the opposite end side of the first joint socket 4 of the H-shaped socket 6 with the first retaining plate, and the second resin skeleton 2a is fitted. The upper end portion of the H-shaped socket 6a with the second fastening plate is fitted into the chamber on the tip end side of the second joint socket 4a. The tip (lower end) of the second resin block body 3a is the first fastening plate 5 of the H-shaped socket 6 with the first fastening plate, and the upper end of the second resin block body 3a is the H-shaped socket 6a with the second fastening plate. Each is closely fixed to the second fastening plate 5a. The second resin block body 3a is an impermeable resin block body.

In the drain pipe main body 1, the tip end portion (lower end portion) of the third resin skeleton 2b is fitted into the chamber 44a on the opposite end side of the second joint socket 4a of the H-shaped socket 6a with the second fastening plate, and the third resin skeleton skeleton is fitted. The upper end portion of 2b is fitted into the chamber 43b on the tip end side of the third joint socket 4b of the H-shaped socket 6b with the third retaining plate. The tip (lower end) of the third resin block body 3b is the second fastening plate 5a of the H-shaped socket 6a with the second fastening plate, and the upper end of the third resin block body 3b is the H-shaped socket 6b with the third fastening plate. They are closely fixed to the third fastening plate 5b, respectively. The H-shaped socket 6a with the second fastening plate and the H-shaped socket 6b with the third fastening plate are the same as the joint socket 6 with the first fastening plate. The third resin block body 3b is a water-permeable resin block body.

In the drain pipe main body 1, the tip end portion (lower end portion) of the fourth resin skeleton 2c is fitted into the chamber 44b on the opposite end side of the third joint socket 4b of the H-shaped socket 6b with the third retaining plate, and the fourth resin skeleton is fitted. The upper end portion of 2c is fitted into the chamber 43c on the tip end side of the fourth joint socket 4c of the H-shaped socket 6c with the fourth retaining plate. The tip (lower end) of the fourth resin block body 3c is the third fastening plate 5b of the H-shaped socket 6b with the third fastening plate, and the upper end of the fourth resin block body 3c is the H-shaped socket 6c with the fourth fastening plate. Each is closely fixed to the fourth fastening plate 5c. The H-shaped socket 6c with the fourth fastening plate is the same as the H-shaped socket 6 with the first fastening plate. The fourth resin block body 3c is a water-permeable resin block body.

In the drain pipe 10, the lower end portion of the upper filter 7 is fitted into the chamber 44c on the opposite end side of the joint socket 4c of the H-shaped socket 6c with the fourth retaining plate. The upper filter 7 is cueed in the rainwater mass 8 and captures dust and the like mixed in rainwater and the like. The rainwater or the like that has flowed into the rainwater mass 8 flows into the drain pipe 10 (see FIG. 1).

Next, an example of a method of assembling the drain pipe 10 will be described. By a preliminary survey, it is confirmed that underground underground water veins exist in the ground within the range where the drain pipe 10 is built. In addition, the depth of the underground underground water vein from the ground surface is determined by a known measurement method. In assembling the drain pipe 10, after the drain pipe 10 is built in the ground, the portion corresponding to the underground underground water vein is assembled so as to be an impermeable resin block body. In the following assembly, the portion corresponding to the underground underground water vein is the second resin block body 3a.

First, an end cap 9, an H-shaped socket with four fastening plates 6, four resin skeletons 2, four resin block bodies 3, and an upper filter are prepared. Of the four resin block bodies 3, three resin block bodies are water-permeable resin block bodies, and one resin block body is an impermeable resin block body. First, the first resin block 3 is applied to the outer peripheral surface of the first resin skeleton 2. At this time, no adhesive or the like is required. Next, the end cap 9 is applied to the tip of the first resin skeleton 2, and the H-shaped socket 6 with the first retaining plate is attached to the end of the first resin skeleton 2 on the ground surface side. For this attachment, an adhesive is applied to the inner wall of the chamber 43 on the tip end side of the first joint socket 4, and then the first resin skeleton 2 is fitted. As a result, the first resin skeleton 2 and the first joint socket 4 are fixed. Next, the first fastening plate 5 is rotated so as to advance downward (tightening direction), and the first resin block 3 is compressed and fixed. As a result, the first resin block 3 is fixed by the end cap 9 and the first fastening plate 5.

Next, the second resin block 3a is applied to the outer peripheral surface of the second resin skeleton 2a. At this time, no adhesive or the like is required. Next, the tip end portion of the second resin skeleton 2a is attached to the chamber 44 on the opposite end side of the first joint socket 4. For this attachment, an adhesive is applied to the inner wall of the chamber 44 on the opposite end side of the first joint socket 4, and then the second resin skeleton 2a is fitted. As a result, the second resin skeleton 2a and the first joint socket 4 are fixed. Next, the end portion of the second resin skeleton 2a on the ground surface side is fitted into the chamber 43a on the tip end side of the second joint socket 4a. Similarly, an adhesive is previously applied to the inner wall of the chamber 43a of the second joint socket 4a. Next, the first fastening plate 5 is screwed into the second joint socket 4a and rotated downward (tightening direction) to compress and fix the second resin block 3a. As a result, the second resin block 3a is fixed between the second fastening plate 5a and the first fastening plate 5. After that, in the same manner, the third resin block 3b is fixed between the third fastening plate 5b and the second fastening plate 5a, and the fourth resin block 3c is fixed between the fourth fastening plate 5c and the third fastening plate 5b. It is fixed.

The drain pipe main body 1 can be obtained by the above mounting method. Next, the upper filter is attached to the H-shaped socket 6c with the fourth retaining plate and the chamber 44c on the ground surface side of the fourth joint socket 4c. As a result, the drain pipe 10 is obtained. The total length of the drain pipe 10 is appropriately determined depending on the size of the rainwater infiltration facility, but is usually several meters to a dozen meters.

Next, how to use the drain pipe 10 will be described. First, an excavation hole for building a drain pipe 10 in the ground is constructed by an excavation device equipped with an auger screw. The hole diameter of the drilled hole is the same as or slightly larger than the outer diameter of the drain pipe 10. Further, the length of the excavation hole may be substantially the same as the length of the drain pipe main body 1. This length is such that the drain pipe 10 is sufficiently located on the ground suitable for permeation. Next, the drain pipe 10 obtained by the above method is built in this excavation hole. Since the gap around the drain pipe 10 is filled by the collapse of the surrounding soil, no subsequent backfill material is required. According to the drain pipe 10, since the resin skeleton 2 is fixed by the joint socket 4 and the resin block 3 is crimp-fixed by the fastening plate 5, the surface adhesion of the resin block 3 is enhanced and the building is stabilized. Further, the drain pipe 10 can be easily inserted into the center of the excavation hole, and can be accurately inserted to the planned depth. That is, when the casing is pulled out, it is possible to prevent the resin block body from rising together. Further, although it depends on the degree of water permeability of the water-permeable resin block body, a large amount of storage per unit volume can be obtained. Further, although the conventional coarse sand has a variation in the permeability coefficient, a uniform permeability coefficient can be freely set by using a resin block body.

Next, a method of using the drain pipe 10 using the casing will be described. First, the casing is built in the ground by casting. The inner diameter of the casing is slightly larger than the outer diameter of the drain pipe 10, and the length of the casing may be substantially the same as the length of the drain pipe main body 1. Then, the soil and groundwater in the casing are discharged to the ground surface by an auger screw. Next, the drain pipe 10 is built in the hollow casing. The casing is then pulled out to the surface. Since the gap around the drain pipe 10 is filled so that the surrounding soil pushed outward by the casing is returned to its original state, no subsequent backfilling material is required. Building the drain pipe 10 using the casing does not slow down the pulling speed of the casing and eliminates the need to add coarse sand as a backfill material. In the drain pipe 10 constructed in the ground, an impermeable resin block body 3a crosses an underground underground water vein (see FIG. 1).

According to the method of using the drain pipe 10, rainwater or the like on the ground surface flows into the drain pipe 10, and rainwater or the like exceeding the treatment capacity of the drain pipe 10 flows into the sewage pipe main. Rainwater or the like that has flowed into the drain pipe 10 does not permeate the underground underground water vein because the impermeable resin block body 3a crosses the underground underground water vein. On the other hand, through the water-permeable resin block bodies 3, 3b and 3c, which are resin blocks other than the impermeable resin block body 3a, rainwater and the like can permeate into the ground, particularly deep into the underground water vein and below. In addition, since the resin block body is used instead of the conventional backfill material (coarse sand) and the resin block body is attached to the resin frame in advance, the drain pipe is excavated when the drain pipe is inserted into the excavation hole. It is easy to insert in the center of the hole and can be inserted accurately to the planned depth. In addition, the pulling speed of the casing is not reduced, and it is not necessary to add coarse sand as a backfill material. Further, since the joint socket with the retaining plate is used, it is possible to prevent the resin block body from rising together when the casing is pulled out. In addition, since the resin block can be crimped and fixed, the surface adhesion of the resin block is enhanced and the building is stable.

Next, a method of using the drain pipe in another embodiment of the present invention will be described with reference to FIG. 7. In FIG. 7, the same components as those in FIGS. 1 to 6 are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described. That is, in FIG. 7, the differences from FIGS. 1 to 6 are the ground and the drain pipe. That is, in the ground of this example, the upper ground A including the underground underflow vein is the infiltration-unsuitable ground layer, and the lower ground B excluding the underground underflow vein is the infiltration-appropriate ground layer. Further, in the drain pipe 10a of this example, the portion corresponding to the ground A above it excluding the underground underflow water vein is made into an impermeable PVC pipe as a resin skeleton, and the resin block body is omitted. The socket connecting the PVC pipe 3b and the PVC pipe 3c may be a joint socket without a retaining plate or a sleeve type socket. Further, the PVC pipe 3b and the PVC pipe 3c may be one PVC pipe in which both are integrated.

The method of building the drain pipe 10a in the ground is the same as the method of building the drain pipe 10, but after the drain pipe 10a is built in the ground, the resin above the joint socket 6a with the second retaining plate. A backfill material is filled around the skeletons 3b and 3c. In the construction of the drain pipe 10a into the ground, the construction of the drain pipe 10a has already been substantially completed before the backfill material is filled, and the problems of the conventional backfill material filling do not occur. .. That is, the method of using the drain pipe 10a has the same effect as that of the drain pipe 10.

In the drain pipe 10a, the resin skeletons 3b and 3c may be water-permeable resin skeletons, and an impermeable resin block may be further arranged around the resin skeletons 3b and 3c. In this case, the use of backfill material can be omitted.

The method of using the drain pipe of the present invention is not limited to the above-described embodiment, and various modifications can be taken. In the drain pipe of the present invention, although the water permeable sheet is not an essential component, it may be attached to the resin skeleton, for example, on the inner peripheral surface. Since the water-permeable resin block body captures the suspended insoluble substance (SS) in water, clogging of the water-permeable sheet can be prevented. Further, the impermeable portion does not adversely affect the water permeable sheet.

In the drain pipe 10, the joint socket with a fastener plate may be only the joint socket with a fourth fastener plate on the ground surface side, and the other connection joints may be a joint socket without a fastener plate. In this case, the resin block between the end cap 9 and the fastening plate of the joint socket with the fourth fastening plate is compressed and fixed. Further, in the drain pipe 10, the joint socket with a fastener plate may be used in the joint socket with a second fastener plate and the joint socket with a fourth fastener plate, and the other connection joints may be a joint socket without a fastener plate. In this case, the resin block between the end cap 9 and the retaining plate of the joint socket with the second fastening plate and the fastening plate of the joint socket with the second fastening plate and the fastening plate of the joint socket with the fourth fastening plate is compressed and fixed. It will be.

In the drain pipe 10 of the present invention, the retaining plate is not limited to the above-described embodiment, and may have a stepped cross-sectional structure in which the plate thickness around the central through hole is increased. By increasing the plate thickness around the through hole, the number of threads increases and the screwing strength improves.

In the case of an H-shaped joint socket, a notch 33 that avoids the joint socket body is formed at the upper and lower ends of the resin block body, and the formation depth of the notch 33 depends on the installation position and compression of the resin block body. It may be decided in consideration of the reduction rate and the like.

The end cap of the present invention is not limited to the above embodiment, and the same end cap as the joint socket may be used. Even if there are some protrusions on the tip of the end cap, it does not affect the building into the ground.

According to the present invention, it is possible to prevent the water quality of underground underground water from changing due to the inflow of rainwater or the like as much as possible. In addition, it can be buried in the ground to construct a vertical rainwater infiltration facility, which can respond to recent urban floods. In addition, the drain pipe can be stably constructed in the ground, and the use of the conventional backfill material can be substantially omitted.

1 Drain pipe body 2, 2a to 2c Cylindrical resin skeleton 3, 3a to 3c Resin block body 4, 4a to 4c Fitting socket 5, 5a to 5c Fitting plate 6, 6a to 6c Fitting plate with fitting socket 7 Upper filter 8 Rainwater mass 9 End cap 10, 10a Drain pipe 10A, 10B Rainwater infiltration facility Z Underground underground water vein

Claims (5)

It is a method of using a drain pipe that allows rainwater or the like to permeate into the ground, and is characterized by arranging a drain pipe having an impermeable portion and a water permeable portion so that the impermeable portion crosses an underground underground water vein. How to use the drain pipe. The method for using a drain pipe according to claim 1, wherein the drain pipe includes a tubular drain pipe resin skeleton and a resin block body disposed outside the drain pipe resin skeleton. The drain tube according to claim 2, wherein the resin block body is a combination of a water-permeable resin block body and an impermeable resin block body, and the impermeable portion is an impermeable resin block body. How to use. The method for using a drain tube according to claim 3, wherein the water-permeable resin block body is a water-permeable porous body. The method for using a drain pipe according to any one of claims 2 to 4, wherein the resin block body is a cylindrical body or an assembled cylindrical body of a half-split cylindrical body.

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