JP2019199713A - Tubular block and tubular block structure - Google Patents

Abstract

To provide a tubular block having an opening structure in which the strength of the entire tubular block is sufficiently ensured and an intrusion of soil and gravel from a surrounding soil wall into the tubular block can be effectively suppressed.SOLUTION: A resinous tubular block 10 formed in a tubular shape and embedded in a cavity 70 formed on the ground, includes: a plurality of first ribs 14 in which at least some portions of the surface of the tubular block 10 are parallel to each other; and a plurality of second ribs 15 in parallel with each other extending in a direction crossing the first ribs 14. A region surrounded by one pair of the adjacent first ribs 14 and one pair of the adjacent second ribs 15 is an opening 16 formed on the surface of the tubular block 10. The opening 16 is sized to prevent intrusion of soil and gravel into the tubular block 10 from a soil wall defining the cavity 70. A nonwoven fabric 17 covering the opening 16 is provided, and the nonwoven fabric 17 is fixed to the tubular block 10 by integral molding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tubular block for constituting a rainwater infiltration structure and a tubular block structure using the tubular block.

  In recent years, a large amount of rainfall exceeding the capacity of sewage pipes, such as torrential rain called guerrilla heavy rain, has occurred relatively frequently in many areas. When such rainfall occurs, water accumulates on the road surface, and the water accumulated on the road surface causes damage such as flooding of rivers and flooding on the floor in low altitude areas.

  Conventionally, as one of the measures to suppress the occurrence of such damage, a rainwater infiltration structure for effectively infiltrating rainwater flowing into the rainwater collector installed on the shoulder of the road into the ground A body has been proposed (see, for example, Patent Document 1).

  The rainwater infiltration structure described in the above document includes a cylindrical rainwater infiltration pipe inserted and arranged in a cavity formed so as to extend downward from the bottom of the rainwater collection tank toward the ground, and a rainwater infiltration pipe. It is comprised by the internal filter with which the whole inside is filled, and the external filter arrange | positioned so that the exterior of a rainwater penetration pipe | tube may be covered.

  In this rainwater infiltration pipe, a plurality of openings (through holes) are formed on a side surface at a position corresponding to the infiltration layer (in the depth direction) in the soil wall defining the cavity. For this reason, the rainwater flowing into the rainwater collection pipe passes through the internal filter inside the rainwater infiltration pipe, and is actively guided to the underground infiltration layer through the opening on the side of the rainwater infiltration pipe and the external filter. It can be effectively penetrated.

JP 2011-21349 A

  By the way, in the said literature, nothing is described regarding the structure of the opening formed in the side surface of the rainwater permeation pipe. As the structure of the opening formed on the side surface of the tubular block used as such a rainwater infiltration pipe, the strength of the entire tubular block is sufficiently secured, and the intrusion of debris from the surrounding soil wall into the tubular block Those that can effectively suppress the above are preferred.

  The present invention has been made in view of the above-described circumstances, and the object thereof is to ensure the strength of the entire tubular block, and to effectively prevent intrusion of debris from the surrounding soil wall into the tubular block. An object of the present invention is to provide a tubular block having an opening structure that can be suppressed, and a tubular block structure using the tubular block.

In order to achieve the above-described object, the tubular block according to the present invention is characterized by the following (1) to (4).
(1) A resinous tubular block formed in a tubular shape and embedded in a cavity formed in the ground,
At least a part of the surface of the tubular block is constituted by a plurality of first ribs parallel to each other and a plurality of second ribs parallel to each other extending in a direction intersecting the first ribs,
A region surrounded by a pair of adjacent first ribs and a pair of adjacent second ribs is an opening formed on the surface of the tubular block,
The opening is sized to prevent intrusion of debris from the dirt wall defining the cavity into the tubular block.

(2) In the tubular block according to (1) above,
A non-woven fabric covering at least the opening;
The nonwoven fabric has a function of removing a predetermined substance contained in water penetrating from the inside of the tubular block into the earth wall.

(3) In the tubular block according to (2) above,
The nonwoven fabric is fixed to the tubular block by integral molding.

(4) In the tubular block according to any one of (1) to (3) above,
One end of the tubular block in the tube axis direction and the other end of the other tubular block in the tube axis direction are formed to be detachable from each other.

  According to the tubular block having the configuration of (1) above, the opening (through hole) formed in the surface (side surface) of the tubular block includes a pair of adjacent first ribs constituting the surface (side surface) of the tubular block. It is formed as a region surrounded by a pair of adjacent second ribs. Thereby, the tubular block can be easily designed so that the strength of the entire tubular block is not less than the required strength by adjusting the number, thickness, interval, and the like of the first and second ribs. . Further, the opening is sized to prevent intrusion of debris from the earth wall defining the cavity into the tubular block. Thereby, the penetration | invasion of the debris from the surrounding earth wall to the inside of a tubular block can be suppressed effectively.

  According to the tubular block having the configuration (2), suspended substances and suspended substances contained in water penetrating from the inside of the tubular block to the soil wall can be effectively removed. In addition, since the opening has a size that suppresses intrusion of debris from the earth wall defining the cavity into the tubular block, it is difficult for excessive earth pressure due to debris to act on the nonwoven fabric. For this reason, durability of a nonwoven fabric improves.

  According to the tubular block having the configuration (3), since the nonwoven fabric is integrally formed with the tubular block, it is necessary to perform a step of placing the nonwoven fabric in the tubular block after the tubular block is embedded in the cavity formed on the ground. There is no. Therefore, as described in the above-mentioned document, the construction period required for installing the rainwater infiltration structure can be shortened as compared with an aspect in which the step of arranging the internal filter and the external filter is required after the installation of the tubular block in the cavity.

  According to the tubular block having the configuration (4), the tubular blocks can be connected in series so that the tube axes coincide with each other. For this reason, the length of the tubular block structure (rainwater permeation structure) is set in accordance with the depth of the ground cavity by appropriately changing the number of a plurality of tubular blocks of the same length connected in series. The length can be easily adjusted. As a result, as described in the above document, it is not necessary to prepare multiple types of rainwater permeation pipes having different lengths in order to adjust the length of the rainwater permeation structure, thereby reducing the manufacturing cost of the tubular block. be able to.

In order to achieve the above-described object, the tubular block structure according to the present invention is characterized by the following (5) to (6).
(5) one or more tubular blocks according to (4) above;
A tubular block structure comprising: the tubular block and an auxiliary pipe connected so that the pipe axes coincide with each other;
One end of the auxiliary tube in the tube axis direction and the other end of the tubular block in the tube axis direction are detachable from each other,
The tubular block structure is embedded in the cavity;
The tubular block and the auxiliary are disposed so that the auxiliary pipe is disposed at a position corresponding to the impervious layer of the earth wall defining the cavity, and the tubular block is disposed at a position corresponding to the infiltrated layer of the earth wall. The tube is connected.

(6) In the tubular block structure according to the above (5),
A tubular filter block for flowing water into the tubular block structure is further connected to the upstream side of the tubular block structure,
The tube block direction end of the filter block is detachably formed on either the other end of the tubular block or the other end of the auxiliary tube,
The filter block is formed with one or more openings,
A non-woven fabric that is the same as the non-woven fabric fixed to the tubular block or coarser than the non-woven fabric is fixed inside the filter block so as to cover the opening.

  According to the tubular block structure having the above configuration (5), when the soil wall defining the cavity is formed of the permeation layer over the entire region in the depth direction, there is no opening on the side surface (none A tubular block structure can be constituted by only a (perforated) tubular block having an opening on the side surface without using an auxiliary tube (perforated). On the other hand, when the soil wall defining the cavity includes a portion of the permeation layer and a portion of the impervious layer in the depth direction, a non-porous auxiliary pipe is disposed at a position corresponding to the impervious layer, and the permeation layer A perforated tubular block may be disposed at a position corresponding to. As a result, the tubular block structure can be provided with variations according to the shape of the cavity.

  Furthermore, when the earth wall that defines the cavity includes a portion of the permeation layer and a portion of the impervious layer in the depth direction, a relatively expensive tubular block and a relatively inexpensive auxiliary pipe are used in combination. Thus, the manufacturing cost of the entire tubular block structure can be reduced as compared with the case where the tubular block structure is configured only by relatively expensive tubular blocks.

  A plurality of tubular blocks constituting the tubular block structure, or the tubular block and the auxiliary pipe are already connected in series (integrated state), and the entire tubular block structure is inserted into the cavity; and Can be pulled out of the cavity. For this reason, the operation | work regarding installation and removal of a tubular block structure becomes very easy.

  According to the tubular block structure having the configuration (6), the water from which unnecessary substances such as debris are removed can be caused to flow into the tubular block structure by the installation of the filter block. In addition, the tube axis direction end of the filter block is detachably formed on either the other end of the tubular block or the other end of the auxiliary tube. Therefore, in either case where the tubular block structure is constituted only by the tubular block, or in the case where the tubular block structure is constituted by using the tubular block and the auxiliary pipe together, the upstream side of the tubular block structure. Filter blocks can be arranged in

  Further, a non-woven fabric that is the same as the non-woven fabric fixed to the tubular block or coarser than the non-woven fabric is provided inside the filter block. Thereby, generation | occurrence | production of the clogging of this nonwoven fabric can be suppressed as much as possible.

  According to the present invention, the tubular block having a structure in which the strength of the entire tubular block is sufficiently ensured, and which can effectively suppress intrusion of debris from the surrounding soil wall into the tubular block, and A tubular block structure using the tubular block can be provided.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 shows an example of a case where a tubular block structure according to an embodiment of the present invention is installed inside a cavity extending downward from the bottom of a rainwater collecting tank installed on the shoulder of a road toward the ground. It is a schematic diagram shown. 2 is a cross-sectional view taken along line 2-2 shown in FIG. FIG. 3 is an exploded side view of the tubular block structure shown in FIG. 4A is a perspective view of the tubular block shown in FIG. 1, and FIG. 4B is a main cross-sectional view of the tubular block. Fig.5 (a) is a perspective view of the cap shown in FIG. 1, FIG.5 (b) is principal sectional drawing of the said cap. Fig.6 (a) is a 1st figure for demonstrating the procedure at the time of embedding the tubular block structure which concerns on embodiment of this invention in the ground, FIG.6 (b) demonstrates the said procedure. It is the 2nd figure for doing. Fig.7 (a) is the 3rd figure for demonstrating the procedure at the time of embedding the tubular block structure which concerns on embodiment of this invention in FIG. 7, (b) demonstrates the said procedure. It is the 4th figure for doing.

  Hereinafter, a tubular block 10 according to an embodiment of the present invention and a tubular block structure 1 using the tubular block 10 will be described with reference to the drawings.

  The tubular block structure 1 shown in FIG. 1 effectively infiltrates the rainwater flowing into the rainwater collecting basin 64 installed on the road shoulder 63 located between the roadway 61 and the sidewalk 62 of the road 60 into the ground. It is a rainwater infiltration structure installed in.

  A connecting pipe 65 connected to a sewer main pipe (not shown) is provided on the side surface at a predetermined height from the bottom surface of the rainwater collecting tank 64. As a result, when the liquid level of the rainwater collected in the rainwater collector 64 reaches the predetermined height from the bottom surface of the rainwater collector 64, the rainwater in the vicinity of the liquid surface enters the sewage main pipe via the connecting pipe 65. It comes to leak. A cavity 70 extending downward from the through hole 66 toward the ground (downward) by a distance “L1 + L2” is continuous with the through hole 66 provided on the bottom surface of the rainwater collecting tank 64.

  In the example shown in FIG. 1, in the ground, in the depth range from the ground to the position below the bottom surface of the rainwater collecting basin 64 by a distance L1, the impervious layer 67 (comprised of debris that is difficult for water to penetrate). Layer), and a permeation layer 68 (a layer made of earth and stone that easily penetrates water) is located below the impermeable layer 67. For this reason, the earth wall (inner wall of the cavity 70) that defines the cavity 70 is configured by the impervious layer 67 in the portion corresponding to the upper distance L1 and the infiltrated layer 68 in the portion corresponding to the lower distance L2. It is configured. Therefore, in order to effectively infiltrate the rainwater flowing into the rainwater catchment mass 64 into the ground, the rainwater collected in the rainwater catchment mass 64 is a part of the earth wall corresponding to the lower distance L2 in the cavity 70. It is necessary to permeate into the permeation layer 68 through the.

  In the example shown in FIG. 1, the tubular block structure 1 is inserted and installed in the cavity 70 through the through-hole 66 on the bottom surface of the rainwater collecting tank 64. As shown in FIG. 2, a backfill material 71 is filled in a space between the outer surface of the tubular block structure 1 installed in the cavity 70 and the soil wall that defines the cavity 70. The backfill material 71 is typically composed of coarse washing sand.

  Hereinafter, each component which comprises the tubular block structure 1 is demonstrated in order, referring FIGS. 3-5. As shown in FIG. 3, the tubular block structure 1 shown in FIG. 1 includes a tubular block 10, an auxiliary pipe 20, a filter block 30, a cap 40, and a joint 50.

  As shown in FIG. 4, the resin tubular block 10 includes a cylindrical main body portion 11, a cylindrical male screw portion 12 coaxially continuous with one end of the main body portion 11 in the tube axis direction, and a main body portion 11. And a cylindrical female screw portion 13 that is coaxially continuous with the other end in the tube axis direction. The tubular block 10 may typically be made of polypropylene that is excellent in strength and durability.

  Substantially the entire side surface (surface) of the main body 11 has a plurality of first ribs 14 extending in parallel to each other in the circumferential direction with a predetermined interval in the tube axis direction, and each having a predetermined interval in the circumferential direction. And a plurality of second ribs 15 extending parallel to each other in the axial direction. For this reason, the side surface (surface) of the main body 11 has a plurality of rectangular shapes each surrounded by a set of adjacent first ribs 14 and a set of adjacent second ribs 15 over substantially the entire surface. Opening 16 (through hole) is formed. Each opening 16 has a size that prevents intrusion of debris from the earth wall defining the cavity 70 into the tubular block 10.

  Further, as shown in FIG. 2, the cylindrical inner wall surface of the main body 11 (more specifically, the inner wall surfaces of the first and second ribs 14 and 15) is provided with substantially the entire region (therefore, the opening 16). The nonwoven fabric 17 is integrally formed so as to cover it. The nonwoven fabric 17 exhibits a function of removing predetermined substances (for example, suspended substances and suspended substances) contained in water penetrating from the inside of the tubular block 10 to the soil wall of the cavity 70. The nonwoven fabric 17 can typically be made of polyester that is well permeable to water and has a water permeability equal to or greater than that of sand.

  Returning to FIG. 4, a male screw 12 a is formed on the outer surface of the male screw portion 12. On the other hand, a female screw 13 a is formed on the inner surface of the female screw portion 13. The male screw 12a of the male screw part 12 and the female screw 13a of the female screw part 13 have a shape that can be screwed together. In other words, the male threaded portion 12 of the tubular block 10 and the female threaded portion 13 of the other tubular block 10 are formed to be detachable from each other, and the tubular blocks 10 are connected in series so that the tube axes coincide with each other. Can be done.

  For this reason, the part (namely, it has the opening 16 in the side surface) which comprises the tubular block 10 in the tubular block structure 1 by changing suitably the number which connects several types of the tubular blocks 10 of the same length in series. The length of the perforated tube can be easily adjusted. In the example shown in FIG. 1, three types of tubular blocks 10 having the same length are connected in series, so that the length of the perforated tube in the tubular block structure 1 is the depth of the osmotic layer 68 in the cavity 70. The length is adjusted to be close to L2. In the example shown in FIG. 1, each tubular block 10 is arranged in the cavity 70 in such a direction that the male screw portion 12 is on the lower end side.

  As shown in FIG. 5, the resin cap 40 has a bottomed cylindrical shape, and a female screw 40 a that can be screwed with the male screw 12 a of the tubular block 10 is formed on the inner surface thereof. . Therefore, the cap 40 and the male screw portion 12 of the tubular block 10 are detachable from each other. The outer diameter of the cap 40 substantially matches the outer diameter of the tubular block 10. The cap 40 may typically be made of polypropylene that is excellent in strength and durability.

  In the example shown in FIG. 1, as shown in FIG. 3, the cap 40 has a tubular block 10 (hereinafter referred to as “the lowermost”) among the three tubular blocks 10 constituting the perforated tube of the tubular block structure 1. It is attached to the male screw portion 12 on the lower end side of the lowermost tubular block 10 ”. Thereby, it is possible to prevent debris from entering the inside of the tubular block 10 through the opening on the lower end side of the lowermost tubular block 10 from the earth wall defining the bottom surface of the cavity 70.

  The resin auxiliary pipe 20 is typically a cylindrical molded body made of vinyl chloride. No opening is formed on the side surface of the auxiliary tube 20. That is, the auxiliary tube 20 is a non-porous tube. The outer diameter of the auxiliary tube 20 is substantially the same as the outer diameter of the tubular block 10. In the example shown in FIG. 1, the length of the auxiliary pipe 20 is adjusted to a length close to the depth L <b> 1 of the impermeable layer 67 in the cavity 70.

  As shown in FIG. 3, the resin joint 50 is a cylindrical member for connecting and fixing the female screw portion 13 of the tubular block 10 and the lower end of the auxiliary pipe 20. On the lower end side of the joint 50, a male screw portion 51 having a male screw that can be screwed with the female screw 13a of the female screw portion 13 of the tubular block 10 is formed. In the example shown in FIG. 1, the male screw portion 51 on the lower end side of the joint 50 and the tubular block 10 positioned on the uppermost side among the three tubular blocks 10 constituting the perforated tube of the tubular block structure 1 (hereinafter, “ The upper end female thread portion 13 of the uppermost tubular block 10) is screwed together, and the upper end portion of the joint 50 and the lower end portion of the auxiliary pipe 20 are coaxially connected and fixed by an arbitrary method. Thus, the uppermost tubular block 10 and the auxiliary pipe 20 are coaxially connected and fixed via the joint 50. The outer diameter of the joint 50 substantially matches the outer diameter of the tubular block 10. The joint 50 is typically made of vinyl chloride.

  As shown in FIG. 3, the resin filter block 30 includes a cylindrical main body 31 having a plurality of openings 34 (through holes) formed on the side surface, and an opening on the upper end side of the main body 31 in the tube axis direction. It has a bottomed cylindrical cap 32 connected and fixed to the upper end side so as to close, and a cylindrical joint 33 connected and fixed to the lower end side of the main body portion 31 in the tube axis direction. The outer diameter of the filter block 30 (= the main body 31 + the cap 32 + the joint 33) is substantially the same as the outer diameter of the tubular block 10. The main body 31 and the cap 32 are typically made of polypropylene having excellent strength and durability, and the joint 33 is typically made of vinyl chloride.

  Further, a non-woven fabric (not shown) is integrally formed on the cylindrical inner wall surface of the main body 31 in the same manner as the non-woven fabric 17 of the tubular block 10 so as to cover substantially the entire area, and thus the opening 34. This non-woven fabric exhibits a function of filtering rainwater flowing into the tubular block structure 1 from the rainwater collector 64. In addition, in this specification, filtration means removing specific substances, such as debris, from inflowing water, such as rainwater. In order to suppress the occurrence of clogging of the nonwoven fabric as much as possible, it is preferable to use a nonwoven fabric having coarser mesh than the nonwoven fabric 17 of the tubular block 10. This non-woven fabric, like the non-woven fabric 17, can typically be composed of “polyvinyl chloride + polyester” which allows water to pass well and has a water permeability equal to or higher than that of sand.

  The cap 32 is provided in the tubular block structure 1 through the opening on the upper end side of the filter block 30 (more specifically, the main body portion 31) without the rainwater in the rainwater collecting water 64 being filtered by the nonwoven fabric. It is a member provided in order to prevent inflow. The joint 33 is a member provided for connecting and fixing the lower end of the main body 31 and the upper end of the auxiliary pipe 20. The lower end portion of the joint 33 and the upper end portion of the auxiliary pipe 20 are coaxially connected and fixed by an arbitrary method.

  Here, as the main body 31, the cap 32, and the joint 33, the tubular block 10, the cap 40, and the joint 50 can be used, respectively. In this case, the tubular block 10 is arranged in a direction in which the male screw portion 12 is on the upper end side, the male screw portion 12 of the tubular block 10 and the cap 40 are screwed together, the female screw portion 13 of the main body portion 11 and the joint. 50 male screw portions 51 are screwed together.

  When the tubular block structure 1 in which the respective components are connected and fixed in series and integrated as described above is installed in the cavity 70, the tubular block structure 1 is configured by three tubular blocks 10 as shown in FIG. The portion of the perforated pipe that is formed is disposed in a depth range corresponding to the permeation layer 68 in the soil wall that defines the cavity 70, and the portion of the non-porous pipe that is configured by the auxiliary pipe 20 defines the cavity 70. It arrange | positions in the depth range corresponding to the impervious layer 67 in the earth wall to perform. The filter block 30 protrudes upward from the bottom surface of the rainwater collector 64 through the through hole 66 of the rainwater collector 64 and is located inside the rainwater collector 64.

  Therefore, in the example shown in FIG. 1, the rainwater flowing into the rainwater collecting basin 64 passes through the opening 34 of the main body 31 of the filter block 30 and is filtered by a nonwoven fabric integrally formed on the inner wall surface of the main body 31. Later, it flows into the inside of the tubular block structure 1. The water that has flowed in and filtered falls downward, passes through the inside of the non-porous auxiliary pipe 20, and reaches the inside of the perforated tubular block 10. The water that has reached the inside of the tubular block 10 passes through the nonwoven fabric 17 formed integrally with the main body portion 11 to remove predetermined substances (for example, suspended substances and suspended substances) contained in the water, and then It penetrates into the infiltration layer 68 in the ground through the opening 16 on the side surface of the main body 11 and the backfill material 71. As described above, the rainwater flowing into the rainwater collecting mass 64 is filtered and positively applied to the infiltration layer 68 in the ground in a state where predetermined substances (for example, suspended substances and suspended substances) are removed. You will be guided. As a result, the water can be effectively infiltrated into the infiltration layer 68 in the ground.

  Next, a procedure for installing the tubular block structure 1 in the ground will be briefly described with reference to FIGS. 6 and 7. In this example, in the ground, the impervious layer 67 is located in a depth range from the ground to a predetermined depth, and the impervious layer 68 is located below the impervious layer 67.

  First, as shown in FIG. 6A, a boring machine 80 is arranged at a position where a cavity 70 for installing the tubular block structure 1 is to be formed. Next, as shown in FIG. 6B, a screw 90 such as an auger screw is attached to the boring machine 80, and a cavity 70 having a predetermined depth is formed using the boring machine 80 and the screw 90. The lowest end of the cavity 70 is located in the permeation layer 68. Of course, depending on the situation, the cavity 70 may be formed by human power or a known drilling device without using the boring machine 80.

  Next, as shown in FIG. 7A, the tubular block structure 1 in a state where the assembly other than the filter block 30 is completed is inserted into the cavity 70 and installed in the cavity 70. In this example, the portion of the perforated pipe composed of the plurality of tubular blocks 10 is arranged in a depth range corresponding to the permeation layer 68 in the soil wall defining the cavity 70, and the non-tube composed of the auxiliary pipe 20 is used. A portion of the perforated tube is disposed in a depth range corresponding to the impervious layer 67 in the earth wall defining the cavity 70. Thereafter, the filter block 30 is assembled to the upper end portion of the tubular block structure 1.

  Then, as shown in FIG. 7B, the backfill material 71 is filled in the space between the outer surface of the tubular block structure 1 installed in the cavity 70 and the soil wall that defines the cavity 70. To do. In this case, the space between the outer surface of the perforated tube constituted by the tubular block 10 and the permeation layer 68 defining the cavity 70 is filled with the backfill material 71 and the non-tube constituted by the auxiliary tube 20 is filled. The space between the outer surface of the hole tube and the impervious layer 67 that defines the cavity 70 may be filled with raw soil instead of the backfill material 71. Thereby, the operation | work which installs the tubular block structure 1 in the ground is completed.

(Action / Effect)
According to the tubular block 10 and the tubular block structure 1 according to the embodiment of the present invention, the opening 16 (through hole) formed in the surface (side surface) of the tubular block 10 is the surface (side surface) of the tubular block 10. Are formed as a region surrounded by a pair of adjacent first ribs 14 and a pair of adjacent second ribs 15. Thereby, by adjusting the number, thickness, interval, etc. of the first and second ribs 14, 15, the tubular block 10 can be easily made so that the overall strength of the tubular block 10 is not less than the required strength. Can be designed. Furthermore, the opening 16 has a size that prevents intrusion of debris from the earth wall defining the cavity 70 into the tubular block 10. Thereby, the penetration | invasion of the debris from the surrounding earth wall to the inside of the tubular block 10 can be suppressed effectively.

  Furthermore, the tubular block 10 is provided with a nonwoven fabric 17 that covers the opening 16. For this reason, it is possible to effectively remove suspended substances and suspended substances contained in water penetrating from the inside of the tubular block 10 to the soil wall. In addition, since the opening 16 has a size that suppresses intrusion of debris from the dirt wall defining the cavity 70 into the tubular block 10, excessive earth pressure due to the debris hardly acts on the nonwoven fabric 17. . For this reason, the durability of the nonwoven fabric 17 is improved.

  Further, since the nonwoven fabric 17 is integrally formed with the tubular block 10, there is no need to perform a step of placing the nonwoven fabric 17 in the tubular block 10 after the tubular block 10 is embedded in the cavity 70 formed on the ground. Therefore, as described in the above-mentioned document, the construction period required for installing the rainwater infiltration structure can be shortened as compared with an aspect in which the step of arranging the internal filter and the external filter is required after the installation of the tubular block in the cavity.

  Furthermore, since one end of the tubular block 10 in the tube axis direction and the other end of the other tubular block 10 in the tube axis direction are detachable from each other, the tubular blocks 10 are connected in series so that the tube axes coincide with each other. be able to. For this reason, the length of the tubular block structure 1 (rainwater infiltration structure) is set to the depth of the ground cavity 70 by appropriately changing the number of the plurality of tubular blocks 10 of the same length connected in series. It can be easily adjusted to the length according to. As a result, as described in the above document, it is not necessary to prepare a plurality of types of rainwater permeation pipes having different lengths in order to adjust the length of the rainwater permeation structure, thereby reducing the manufacturing cost of the tubular block 10. can do.

  Further, one end of the auxiliary tube 20 in the tube axis direction and the other end of the tubular block 10 in the tube axis direction are detachable from each other. For this reason, when the earth wall that defines the cavity 70 is composed of the permeation layer 68 over the entire region in the depth direction, only the perforated tubular block 10 is used without using the non-porous auxiliary pipe 20. A tubular block structure 1 can be constructed. On the other hand, when the soil wall defining the cavity 70 includes the portion of the permeable layer 68 and the portion of the impermeable layer 67 in the depth direction, the non-porous auxiliary pipe 20 is provided at a position corresponding to the impermeable layer 67. The perforated tubular block 10 may be disposed at a position corresponding to the osmotic layer 68. As a result, the tubular block structure 1 can be provided with variations according to the form of the cavity 70.

  Further, in the case where the earth wall defining the cavity 70 includes the portion of the permeable layer 68 and the portion of the impermeable layer 67 in the depth direction, the relatively expensive tubular block 10 and the relatively inexpensive auxiliary pipe 20 are included. By using together, it is possible to reduce the manufacturing cost of the entire tubular block structure 1 as compared with the case where the tubular block structure 1 is configured only by the relatively expensive tubular block 10.

  Further, in the state in which the plurality of tubular blocks 10 constituting the tubular block structure 1 or the tubular block 10 and the auxiliary pipe 20 are already connected in series (integrated state), the entire tubular block structure 1 is hollow 70. And can be withdrawn from the cavity 70. For this reason, the operation | work regarding installation and removal of the tubular block structure 1 becomes very easy.

  Furthermore, the water after filtration can be caused to flow into the tubular block structure 1 by installing the filter block 30. In addition, the tube axis direction end of the filter block 30 is detachably formed on either the other end of the tubular block 10 or the other end of the auxiliary tube 20. For this reason, in the case where the tubular block structure 1 is constituted only by the tubular block 10 and in the case where the tubular block structure 1 is constituted by using the tubular block 10 and the auxiliary pipe 20 together, the tubular block is used. The filter block 30 can be disposed on the upstream side of the structure 1.

  Furthermore, a non-woven fabric that is the same as the non-woven fabric 17 fixed to the tubular block 10 or coarser than the non-woven fabric 17 is provided inside the filter block 30. Thereby, generation | occurrence | production of the clogging of this nonwoven fabric can be suppressed as much as possible.

(Other aspects)
In addition, this invention is not limited to the said embodiment, A various modification can be employ | adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be made as appropriate. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above-described embodiment, when the soil wall defining the cavity 70 includes the portion of the permeable layer 68 and the portion of the impermeable layer 67 in the depth direction, the pores are non-porous at positions corresponding to the impermeable layer 67. The auxiliary tube 20 is disposed, and the perforated tubular block 10 is disposed at a position corresponding to the permeation layer 68 (see FIG. 1). On the other hand, the perforated tubular block 10 may be disposed at both the position corresponding to the impermeable layer 67 and the position corresponding to the osmotic layer 68 without using the auxiliary pipe 20. In this case, the uppermost tubular block 10 and the filter block 30 are directly connected.

  Furthermore, in the said embodiment, the tubular block 10 side surface (surface) is comprised by the some 1st rib 14 extended in the circumferential direction, and the some 2nd rib 15 extended in a pipe-axis direction (refer FIG. 4). ). On the other hand, the side surface (surface) of the tubular block 10 has a plurality of first ribs 14 that extend in a direction inclined with respect to the circumferential direction, and a plurality of sides that incline with respect to the circumferential direction and extend in a direction intersecting the first ribs 14. The second rib 15 may be configured.

  Furthermore, in the above-described embodiment, the tubular block structure 1 is installed in a cavity extending downward (i.e., in the vertical direction) from the bottom surface of the rainwater collecting tank 64 installed on the shoulder 63 of the road 60 toward the ground. (See FIG. 1). On the other hand, the tubular block structure 1 is a cavity that extends downward (i.e., in the vertical direction) from the bottom surface of the rainwater in the house to the ground, and downward from the bottom surface of the reservoir (i.e., the underground). , And a cavity extending downward (that is, longitudinally) from the bottom surface of the adjustment pond toward the ground.

  Furthermore, the tubular block structure 1 can be arranged in the horizontal direction instead of the vertical direction. Specifically, for example, a groove having a predetermined depth extending in the lateral direction along the ground with respect to the ground may be formed, and the tubular block structure 1 may be disposed in the groove in a direction extending in the lateral direction. Good. Here, conventionally, a horizontal rainwater infiltration structure constituted by a PVC pipe having openings formed at a plurality of locations is already known. When installing this structure, the operation | work of laying a protection sheet (nonwoven fabric) in a groove | channel, installing a PVC pipe | tube on it, and winding a PVC pipe | tube with a protection sheet after that is needed. On the other hand, in the tubular block structure 1, since the nonwoven fabric is already fixed, it is not necessary to perform the process of arrange | positioning a nonwoven fabric in the tubular block structure 1 after installing the tubular block structure 1 in a horizontal direction. Therefore, compared with the conventional horizontal rainwater infiltration structure, the construction period required for installation of the rainwater infiltration structure can be shortened.

Here, the features of the tubular block 10 and the tubular block structure 1 according to the embodiment of the present invention described above are briefly summarized and listed in the following [1] to [6], respectively.
[1] A resinous tubular block (10) formed in a tubular shape and embedded in a cavity (70) formed in the ground,
At least a part of the surface of the tubular block (10) has a plurality of first ribs (14) parallel to each other and a plurality of parallel second ribs (15) extending in a direction intersecting the first rib (14). ) And
An area surrounded by the adjacent pair of the first ribs (14) and the adjacent pair of the second ribs (15) is an opening (16) formed on the surface of the tubular block (10),
The opening (16) has a size that prevents entry of debris into the tubular block (10) from the earth wall defining the cavity (70).
[2] In the tubular block according to [1] above,
A non-woven fabric (17) covering at least the opening (16);
The said nonwoven fabric (17) has a function which removes the predetermined substance contained in the water which osmose | permeates the said soil wall from the said tubular block (10) inside.
[3] In the tubular block according to the above [2],
The nonwoven fabric (17) is fixed to the tubular block (10) by integral molding.
[4] In the tubular block according to any one of [1] to [3],
One end of the tubular block (10) in the tube axis direction and the other end of the other tubular block (10) in the tube axis direction are formed to be detachable from each other.
[5] One or more tubular blocks (10) according to [4] above;
A tubular block structure (1) comprising: the tubular block (10) and an auxiliary pipe (20) connected so that the pipe axes coincide with each other;
One end of the auxiliary tube (20) in the tube axis direction and the other end of the tubular block (10) in the tube axis direction are detachable from each other,
The tubular block structure (1) is embedded in the cavity (70);
The auxiliary pipe (20) is disposed at a position corresponding to the impervious layer (67) of the earth wall defining the cavity (70), and the tubular block is located at a position corresponding to the infiltrated layer (68) of the earth wall. The tubular block (10) and the auxiliary pipe (20) are connected so that (10) is arranged.
[6] In the tubular block structure according to the above [5],
A tubular filter block (30) for flowing water into the tubular block structure (1) is further connected to the upstream side of the tubular block structure (1),
The tube axial direction end of the filter block (30) is detachably formed on either the other end of the tubular block (10) or the other end of the auxiliary tube (20).
The filter block (30) is formed with one or more openings (34),
Inside the filter block (30), a non-woven fabric that is the same as the non-woven fabric (17) fixed to the tubular block (10) or coarser than the non-woven fabric (17) is fixed so as to cover the opening (34). What has been done.

DESCRIPTION OF SYMBOLS 1 Tubular block structure 10 Tubular block 14 1st rib 15 2nd rib 16 Opening 17 Nonwoven fabric 20 Auxiliary pipe 30 Filter block 34 Opening 67 Impervious layer 68 Permeable layer

Claims (6)

A resinous tubular block formed in a tubular shape and embedded in a cavity formed in the ground,
At least a part of the surface of the tubular block is constituted by a plurality of first ribs parallel to each other and a plurality of second ribs parallel to each other extending in a direction intersecting the first ribs,
A region surrounded by a pair of adjacent first ribs and a pair of adjacent second ribs is an opening formed on the surface of the tubular block,
The opening is sized to prevent intrusion of debris from the earth wall defining the cavity into the tubular block,
Tubular block. A non-woven fabric covering at least the opening;
The non-woven fabric has a function of removing a predetermined substance contained in water penetrating from the inside of the tubular block to the earth wall,
The tubular block according to claim 1. The nonwoven fabric was fixed to the tubular block by integral molding,
The tubular block according to claim 2. One end of the tubular block in the tube axis direction and the other end of the other tubular block in the tube axis direction are formed to be detachable from each other.
The tubular block according to any one of claims 1 to 3. One or more tubular blocks according to claim 4;
A tubular block structure comprising: the tubular block and an auxiliary pipe connected so that the pipe axes coincide with each other;
One end of the auxiliary tube in the tube axis direction and the other end of the tubular block in the tube axis direction are detachable from each other,
The tubular block structure is embedded in the cavity;
The tubular block and the auxiliary are disposed so that the auxiliary pipe is disposed at a position corresponding to the impervious layer of the earth wall defining the cavity, and the tubular block is disposed at a position corresponding to the infiltrated layer of the earth wall. Tube and connected,
Tubular block structure. A tubular filter block for flowing water into the tubular block structure is further connected to the upstream side of the tubular block structure,
The tube block direction end of the filter block is detachably formed on either the other end of the tubular block or the other end of the auxiliary tube,
The filter block is formed with one or more openings,
Inside the filter block, a non-woven fabric that is the same as the non-woven fabric fixed to the tubular block or coarser than the non-woven fabric is fixed so as to cover the opening,
The tubular block structure according to claim 5.

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