JP2004183294A - Connecting unit for penetration trenches and construction method for penetration trench - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting unit for penetration trenches, taking the place of a porous water conveyance pipe and crushed stone in the conventional penetration trench, and to provide a construction method for a penetration trench using the connecting unit. <P>SOLUTION: This connecting unit 1 includes a frame composed of a plurality of walls 2 to 5. A storage area for rainwater is partitioned inside the frame. Each wall is provided with a number of water flow holes 6 for securing water flow from the storage area to the outside. A substantially cylindrical water conveyance pipe part 10 communicating with the storage area is provided in the frame. Each connecting unit is constructed to be connected in series to the other unit disposed adjacent thereto. In connecting a plurality of units in series, a chain of water conveyance passages is constructed in the penetration trench by the respective water conveyance pipe parts 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection unit for a penetration trench and a method for constructing a penetration trench using the connection unit.
[0002]
[Prior art]
Generally, rainwater that has fallen into houses and the like eventually flows into sewers and rivers, but the concentration of rainwater on sewers and rivers causes flooding. For this reason, it was conceivable to control rainwater runoff from each house as one of the measures to prevent flood damage, and a penetration trench was devised as one facility for that purpose. Conventional permeation trenches, for example, dug a groove of a predetermined width and depth along a path connecting a catchment basin that once collects rainwater from a house and a sewer, and a number of holes were drilled in the groove. It is configured by arranging a water guide pipe and laying crushed stone around the pipe (see Patent Document 1). According to such an infiltration trench, in the process where rainwater is guided from the catchment basin to the sewer via the water conveyance pipe, rainwater seeps into the crushed stone layer from the pipe and further penetrates into the underground through the crushed stone layer, The amount of rainwater flowing into the sewer etc. is reduced. In addition, although not a permeation trench, a storage permeation facility for temporarily storing rainwater and gaining time until the stored water permeates underground has been proposed. For example, it is known that a large number of container-like members having a large number of holes are arranged vertically and horizontally and vertically in a depression dug down into the ground, thereby forming a storage tank portion capable of penetrating underground (Patent Documents) 2 and 3).
[0003]
[Patent Document 1] Japanese Patent Publication No. Sho 62-31129 (Claims)
[Patent Document 2] Japanese Patent Publication No. Hei 4-26648 (Claims)
[Patent Document 3] Japanese Patent Publication No. 4-35580 (Claims)
[0004]
[Problems to be solved by the invention]
However, in the conventional infiltration trench, after laying crushed stone once to a predetermined height in the excavation trench, arranging a porous water conveyance pipe thereon, and then further laying crushed stone on the pipe, a plurality of steps such as. It took a lot of time and effort. In addition, the porosity of the crushed stone layer composed of crushed stone around the perforated water pipe is as low as about 25 to 35% at most. Therefore, unless the laying length of the infiltration trench is considerably lengthened, sufficient rainwater can be stored. In some cases, the ability to penetrate cannot be obtained.
[0005]
On the other hand, the storage and infiltration facilities as in Patent Documents 2 and 3 dispose a container-like member having a large number of holes (or a division frame divided into a plurality of divisions) in three directions of length, width, and height. This merely constitutes a tank as a storage space capable of penetrating rainwater into the underground layer. For this reason, the container-shaped member and the like disclosed in Patent Document 2 and the like cannot be directly used as a constituent member of the penetration trench without any contrivance.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a connection unit for a permeation trench of a new concept which can be replaced with a porous water conveyance pipe and crushed stone in a conventional permeation trench. Another object of the present invention is to provide a method for constructing a penetration trench that can efficiently construct a penetration trench with a small amount of labor by using such a connection unit for a penetration trench.
[0007]
[Means for Solving the Problems]
The connection unit for a permeation trench of the present invention is a connection unit capable of forming a permeation trench by connecting a plurality of units, and for partitioning a storage area inside and securing water flow from the storage area to the outside. A frame body provided with a water passage portion, and a water guide tube portion provided in the frame body and capable of communicating with the storage region, so that the water passage portion can be connected in series to another unit disposed adjacent to the unit. This is a connecting unit for a permeation trench, wherein a series of water conveyance paths can be constructed in the permeation trench by each water conveyance pipe portion when a plurality of units are connected in series.
[0008]
In the connection unit for a permeation trench of the present invention, the headrace section extends in a connection direction of the unit in an upper region of the storage region, and a wall of the headrace section includes the headrace section. It is preferable that a water introduction opening for guiding a part of the water flowing through the storage area to the storage area is formed. The water pipe section has a substantially cylindrical shape, and the inner and outer diameters of the water pipe section at one end and the other end are different, so that one of the two adjacent units at the time of serial connection is connected. One end of the water pipe section and the other end of the water pipe section of the other unit can be fitted to each other, and based on the mutual fitting, the positioning of two adjacent units and the positioning of those water pipe sections are performed. Preferably, an interconnection is achieved. Alternatively, it is preferable that a positioning portion for positioning each unit in a direction substantially orthogonal to the unit connection direction is provided at an edge of the frame when a plurality of units are connected in series.
[0009]
Furthermore, it is preferable that a transfer mechanism for transferring a solid intruder that has entered the frame to the outside of the unit or to a specific place in the permeation trench is provided in a lower region of the storage region. Further, the transfer mechanism includes a transfer pipe portion that extends in the unit connection direction and is capable of constructing a series of transfer paths when a plurality of units are connected in series, and captures a solid intruder that has entered the frame to transfer the unit. It is preferable to provide a plate-shaped guide portion for guiding the inside of the tube portion.
[0010]
(Explanation of operation of connection unit, etc.) According to the connection unit for a permeation trench of the present invention, when a plurality of units are connected in series, a series of water conveyance paths are constructed by the water conveyance pipe portions that can communicate with the storage area of each unit, This water conveyance path has the same function as the conventional water transmission pipe in the infiltration trench. In addition, the storage area partitioned in the frame body provided with the water passage portion has a temporary storage function of rainwater or the like as an alternative to the crushed stone layer in the conventional infiltration trench. And such a water conveyance path and a storage area (a main part of a permeation trench) can be easily constructed by an extremely simple construction work of simply connecting a plurality of units in series.
[0011]
When a transfer mechanism is provided in the storage area of the connection unit, the solid intruder that has entered the frame of each unit is transferred to a specific place outside the unit or in a permeation trench via the transfer mechanism. Thereby, the inside of the infiltration trench can be cleaned by removing solid intruders from the individual units. It is sufficient that the transfer mechanism provided in the connection unit is one that provides a carry-out route for the solid entering material, and is provided near the permeation trench or outside the permeation trench, as described in an embodiment of the present invention described later. It has a property of exhibiting a transfer function in cooperation with the fluid flow generating means.
[0012]
In addition, it is preferable that the connection unit is made of plastic. In this case, the weight of the unit is reduced, and workability during construction is improved. Further, "a transfer pipe part, which is a component of the transfer mechanism, has a substantially cylindrical shape, and one end and the other end of the transfer pipe part have different inner and outer diameters. One end of the transfer pipe of one of the units and the other end of the transfer pipe of the other unit can be fitted to each other. " A dust-collecting opening for taking solid inducts led by the section into the pipe section, or "a slope where the height decreases as the plate-like guide section is closer to the transfer pipe section." Is preferred.
[0013]
The method for constructing a permeation trench according to the present invention includes a frame provided with a water passage section for securing water flow from the storage region to the outside while partitioning the storage region inside, and a frame provided inside the frame. A plurality of connecting units each including a water guiding pipe portion capable of communicating with the storage area are prepared, and the plurality of connecting units are arranged in series in a groove formed by excavating the ground, and are interconnected. The connecting unit group is covered with a permeable sheet, and then the connecting unit group covered with the permeable sheet is buried underground.
[0014]
The method of constructing this infiltration trench is a so-called preferred method of using the connecting unit. According to this method, by arranging a plurality of connection units in series in a groove in a series connection state, a series of water conveyance paths are constructed by the water conveyance pipe section of each unit in place of the conventional porous water conveyance pipe in the infiltration trench. In addition, the storage area of each unit secures a temporary storage area for rainwater or the like that replaces the crushed stone layer in the conventional infiltration trench. Therefore, according to this method, it is possible to efficiently construct the infiltration trench without using crushed stone or the like and with a small amount of labor. In the method of constructing a permeation trench according to claim 7, it is very preferable to employ the connecting unit according to any one of claims 1 to 6 as a connecting unit for preparing a plurality of connecting units.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0016]
1 to 5 show a specific example of a connecting unit for a permeation trench. The connecting unit 1 includes left and right side walls 2 and 2, an upper wall 3 and a lower wall 4, and is formed in a substantially rectangular parallelepiped shape opened on the front side (front side) and the rear side (rear side) by these four walls. It is configured as an open container. At the center of each of the walls 2 to 4 in the front-back direction, there is provided a central wall 5 that stands upright so as to bisect the unit 1 back and forth. The left, right, upper and lower four sides of the central wall 5 are connected to the left, right, upper and lower walls 2 to 4, respectively, and the basic skeleton of the unit 1 is formed by the left and right side walls 2, 2, the upper wall 3, the lower wall 4, and the central wall 5. Is formed. Various protruding objects as described later exist inside the frame body, but the inside of the frame body is generally a hollow space, and when a plurality of the units 1 are connected, the inside of the frame body is partitioned. The area to be functioned as a storage area for temporarily storing rainwater or the like.
[0017]
Each of the five walls 2 to 5 constituting the frame of the connection unit 1 is formed with a large number of water passage holes 6 as water passage portions. Although the shape and size of each water passage hole 6 are slightly different depending on the installation position and the like, the function is common in that rainwater or the like stored in the frame is guided from the storage area to the outside of the frame. Needless to say, two adjacent storage areas communicate with each other via the water holes 6 provided in the central wall 5 when the plurality of units 1 are connected.
[0018]
Further, a plurality of plate-like vertical ribs 7 (five in this example) and a plurality of plate-like horizontal ribs 8 (seven in this example) are provided inside the frame body and on the front side and the rear side of the center wall 5, respectively. (See FIGS. 2 and 3A). The vertical and horizontal ribs 7 and 8 project forward and rearward from the front and rear surfaces of the central wall 5. The upper and lower ends of the vertical ribs 7 are connected to the inner surfaces of the upper wall 3 and the lower wall 4, respectively, and the left and right ends of the horizontal ribs 8 are connected to the inner surfaces of the left and right side walls 2 and 2, respectively. The vertical and horizontal ribs 7, 8 reinforce the strength and rigidity of the entire frame by interconnecting the walls 2 to 5 constituting the frame, and further enhance the dimensional stability.
[0019]
As shown in FIG. 3A, the distance from the center wall 5 to the leading edge of each of the ribs 7 and 8 (for example, the distance L1 shown in FIG. 3) is different from the distance from the center wall 5 to the other four walls 2 to 4. The protruding length of each of the ribs 7, 8 from the central wall 5 is set so as to be shorter than the distance to the leading edge (for example, the distance L2 shown in the figure). For this reason, even when the respective leading edges of the corresponding four walls 2 to 4 of the adjacent two units 1 and 1 abut upon each other when the plurality of units are connected, the rib 7 of one of the two adjacent units may be contacted. Or, the leading edge of the rib 8 cannot contact the leading edge of the rib 7 or 8 of the other unit, and a gap is secured between the opposing ribs. Therefore, even though the vertical and horizontal ribs 7, 8 are provided in the frame of each unit 1, these ribs 7, 8 do not prevent water from flowing freely up, down, left, and right in the storage area. .
[0020]
As shown in FIGS. 1 to 3, at a position close to the upper wall 3 of the frame, a substantially cylindrical water pipe section 10 penetrating the center wall 5 extends in the connecting direction of the units. Is provided. In particular, as shown in FIG. 3 (A), the water pipe section 10 includes a front half cylindrical portion 11 protruding forward from the front surface of the central wall 5 and a rear half cylindrical portion 12 protruding rearward from the rear surface of the central wall 5. It is configured. The inner diameter D1 of the front half cylinder portion 11 is set slightly larger than the outer diameter D2 of the rear half cylinder portion 12. In addition, the front end position of the front half cylinder portion 11 matches the front end position of the left, right, upper and lower walls 2 to 4, while the rear end of the rear half cylinder portion 12 has the left, right, upper and lower walls 2 to 4. Projecting further rearward than the rear edge. By setting the diameter and the length in the front-rear direction in the front half tubular portion 11 and the rear half tubular portion 12 constituting the water guide tube portion 10, the rear end of the water guide tube portion rear half tubular portion 12 of one unit is connected when a plurality of units are connected. The part can be fitted into the water pipe front half tube part 11 of another unit disposed immediately after the unit.
[0021]
Further, a plurality of water guide openings 13 (four in this example) are cut out and formed on the peripheral wall of the front half cylindrical portion 11 of the water guide pipe portion. The length in the front-rear direction of each water introduction opening 13 is set to be longer than the amount (projection length) of the rear end of the rear half cylindrical portion 12 protruding from the rear end edge of each of the walls 2 to 4. Are connected, and even if the rear end of one of the water pipe sections 12 is fitted into the front pipe section 11 of the other water pipe section, each water supply opening 13 of the water pipe section is completely closed. Absent. That is, even when a plurality of units are connected, communication (or water flow) between the inside of the water guide pipe 10 and the storage area in the frame is ensured by the water guide opening 13 formed by cutting out the water guide pipe 10. .
[0022]
In a lower region of the frame of the connecting unit 1, a transfer mechanism for collecting solid intrusion such as dust and the like that has entered the frame and transferring it to a specific place outside the unit 1 or in a permeation trench is provided. I have. That is, as shown in FIGS. 1 to 3, a substantially cylindrical transfer pipe portion 20 penetrating the central wall at the position close to the lower wall 4 in the frame extends in the connecting direction of the units. It is provided as follows. The diameter of the transfer pipe 20 is set smaller than the diameter of the water pipe 10.
[0023]
In particular, as shown in FIG. 3A, the transfer pipe portion 20 also includes a front half tube portion 21 protruding forward from the front surface of the center wall 5 and a rear half tube portion 22 protruding rearward from the rear surface of the center wall 5. It is configured. And, as in the case of the water pipe section 10, the inner diameter D3 of the front half tubular section 21 of the transfer pipe section is set slightly larger than the outer diameter D4 of the rear half tubular section 22. Further, the front end position of the front half cylinder portion 21 coincides with the front end position of the left, right, upper and lower walls 2 to 4, while the rear end of the rear half cylinder portion 22 has the left, right, upper and lower walls 2 to 4. Projecting further rearward than the rear edge. By setting the diameter and the length in the front-rear direction in the front half tube portion 21 and the rear half tube portion 22 constituting the transfer tube portion 20, the rear end of the transfer tube portion rear half tube portion 22 of one unit when a plurality of units are connected. The part can be fitted into the transfer tube front half cylinder part 21 of another unit arranged immediately after the unit.
[0024]
Inside the transfer pipe section 20, a reinforcing rib 23 having a cross-shaped cross section is provided extending in the longitudinal direction (front-rear direction) (see FIGS. 2 and 3A). In addition, a plurality of dust collection openings 24 (one each on the left and right in this example) are cut out and formed in the peripheral wall of the front half cylindrical portion 21 of the transfer pipe portion. The length of each dust collection opening 24 in the front-rear direction is set to be longer than the amount (projection length) of the rear end of the rear half cylindrical portion 22 projecting from the rear end edge of each of the walls 2 to 4. 1 is connected, and even if the rear end portion of one transfer tube portion rear half tube portion 22 is fitted into the other transfer tube portion front half tube portion 21, each dust collection opening 24 of the transfer tube portion is completely closed. Never.
[0025]
Further, a pair of plate-like guide portions 25, 25 located on the left and right sides of the transfer pipe portion 20 protrude from front and rear surfaces of the central wall 5 at positions near the lower wall 4 in the frame body. Each plate-shaped guide portion 25 is inclined and provided so as to be highest at an outer end portion connected to the left or right side wall 2 and lowest at an inner end portion connected to the dust collection opening 24 of the transfer pipe portion. I have. Each of the inclined plate-shaped guide portions 25, 25 captures a solid intruder such as dust entering the frame and falling from above, and also captures the captured solid intruder by a guiding action caused by the inclination gradient. Is guided to the dust collecting opening 24 and fed into the transfer pipe section 20. As described above, the transfer mechanism is constituted by the transfer pipe portion 20 having at least the dust collection opening 24 and the pair of left and right plate-like guide portions 25, 25.
[0026]
The frame (walls 2 to 5) and the projecting objects (7, 8, 10, 20, 23, 25, etc.) described above are all made of plastic (for example, polyethylene or polypropylene). By integral molding using an injection molding device and bonding of a plastic member to the molded product, they are integrated as a single connected unit product. Incidentally, the dimensions of the frame of the connecting unit 1 of the present embodiment are as follows: the length in the connecting direction is 25 cm, the width is 50 cm, the height is 100 cm, and the weight is about 5 kg. The porosity inside the connection unit 1 is about 95%.
[0027]
Furthermore, in order to improve the workability when connecting a plurality of units and to ensure the reliability of the mutual connection, a plurality of connecting parts 30 are mounted on each connecting unit 1 in advance. As shown in FIG. 6, the connecting part 30 is a band-shaped member made of, for example, a flexible material (for example, soft plastic), and the front end of the connecting part 30 bulges like a mushroom on the back surface. First and second legs 31, 32 are provided.
[0028]
On the other hand, holes for inserting the legs of the connecting part 30 are formed through the left, right, upper and lower walls 2 to 4 of the connecting unit 1. For example, as shown in FIG. 4, a support hole 33 and a temporary fixing hole 34 are formed side by side near both ends on the front side of the upper wall 3, and a permanent fixing hole 35 is formed near both ends on the rear side of the upper wall 3. Is formed. The inner diameters of the support hole 33 and the final stop hole 35 are substantially equal, but the inner diameter of the temporary stop hole 34 is slightly larger than the inner diameters of the other holes 33 and 35. Such a combination of three holes including the support hole 33, the temporary fixing hole 34, and the final fixing hole 35 is provided in each of the left and right end regions of the upper wall 3 (see FIG. 4), and in the left and right end regions of the lower wall 4 respectively. Each set (not shown) and each set (see FIG. 3B) are provided in the upper end area, the central area, and the lower end area of each of the left and right side walls 2 and 2.
[0029]
For example, as shown in FIGS. 5 and 6, by fitting the first leg 31 of the connecting part into the support hole 33, the connecting part 30 can rotate about the first leg 31 with respect to the upper wall 3. Attached to. When the unit 1 is not connected (that is, when the unit 1 is not used for storage in a warehouse or during transportation), the second leg 32 of the connecting part is inserted into the temporary fixing hole 34 so that the connecting part 30 can be connected. Is prevented from hanging around or getting in the way of the side of the unit 1. On the other hand, when connecting a plurality of units, for example, as shown in FIG. 5, two adjacent units 1 and 1 are arranged so that one rear surface side and the other front surface side are joined. Then, the permanent retaining hole 35 provided at the rear end of the one unit and the support hole 33 provided at the front end of the other unit are opposed to each other. Is substantially equal to the distance between the first and second leg portions 31 and 32 of the coupling part 30. Therefore, by removing the second leg portion 32 of the connecting part from the temporary fixing hole 34 and inserting the second leg portion 32 into the permanent fixing hole 35 of the adjacent unit, two adjacent units 1, 1 are connected via the connecting part 30. Tightly connected.
[0030]
Next, a method of constructing a penetration trench using the connecting unit 1 shown in FIGS. 1 to 6 will be described. In addition, as shown in FIG. 7, for example, the infiltration trench T is installed underground on the site of the building. A collection basin 41 for collecting rainwater that has fallen into the building is provided on the site, and the rainwater can be discharged from the collection basin 41 to a sewer or a river outside the site via an underground water conduit 42. . In the example of FIG. 7, a water collecting basin 43 for branching is provided in the middle of an underground water conduit 42 connecting the first water collecting basin 41 and a sewer or a river, and is located at a predetermined distance from the water collecting basin 43. An inspection cell 44 is provided in the base, and a seepage trench T is installed in the basement connecting the water collecting cell 43 for branching and the cell 44 for inspection. Specifically, the construction is performed according to the procedure shown in FIGS.
[0031]
First, as shown in FIGS. 8A and 8B, a groove is dug in the ground. The size of the groove is, for example, 5 m or more in length, about 1 m in width, and about 1.5 m in depth. Next, the water permeable sheet 45 is laid so as to cover the entire bottom and inner surface of the excavated trench. The water-permeable sheet 45 is a sheet member having a property (water permeability) that allows water to pass therethrough but does not allow solids such as soil and sand to pass therethrough, and is made of, for example, a nonwoven fabric. Then, a plurality of the connection units 1 are arranged in series on the water-permeable sheet 45 laid on the groove bottom. At the time of this series arrangement, the projecting end of the water pipe section rear half tubular section 12 of the unit 1 located on the front side and the projecting end of the transfer pipe section rear half tubular section 22 of the unit 1 are connected to the front pipe section of the water pipe section of the unit 1 located on the rear side. The two units are arranged so as to be fitted into the inner tube 11 and the transfer tube part front half tube part 21, respectively. Based on the mutual fitting of the water pipe section 10 and the transfer pipe section 20, the displacement of each unit in the left-right direction and the up-down direction is regulated, and the positioning is reliably performed between the two units adjacent to each other.
[0032]
As shown in FIG. 8C, when a predetermined number of units 1 (16 units in the figure) are arranged in series, the connecting parts 30 attached to the left and right side walls 2, 2 and the upper wall 3 of each unit 1 are removed. Used to permanently connect adjacent units to each other. Specifically, the second leg 32 of each connecting part 30 attached to each unit 1 is detached from the temporary fixing hole 34, and the connecting part 30 is rotated by about 90 degrees, and the second leg 32 is moved to the unit. Into the final stop hole 35 of another unit located on the front side of. By this replacement operation of the connecting parts 30, a tight series connection between the two units 1, 1 adjacent to each other in front and rear is achieved. In addition, the water pipe sections 10 of each unit 1 are connected in series, and the transfer pipe sections 20 of each unit 1 are connected in series. A headrace path and a series of horizontally extending transfer paths are established.
[0033]
After the series connection of the plurality of units is completed, the water collecting tub 43 for branching and the tub 44 for inspection are installed at each of the front end position and the rear end position of the connection unit group. Each of these squares 43 and 44 is an upright cylindrical or square tubular member, although the purpose of installation is different. Then, the water collecting basin 43 and the water conduit section 10 of the unit located at the head of the connection unit group are connected by a conduit 46 so that water can flow between them. In addition, the inspection box 44 and the transfer pipe section 20 of the unit located at the end of the connection unit group are connected by a conduit 47 so that they can communicate with each other. As the conduits 46 and 47, for example, cylindrical pipes made of vinyl chloride resin are used. In addition, it is preferable to attach a sheet for preventing soil particles from penetrating only water in principle to each end opening 46a, 47a of the conduits 46, 47 so that soil particles do not enter the connecting unit as much as possible. . In addition, blind plugs 48 and 49 are respectively applied to the rear end of the water pipe section 10 of the unit located at the end of the connection unit group and the front end of the transfer pipe section 20 of the unit located at the head of the connection unit group. Preventing earth and sand from entering the water conveyance path and the transfer path of the connection unit group.
[0034]
Subsequently, the front, rear, left and right side surfaces and the upper surface of the connecting unit group are covered with the water-permeable sheet 45. Then, using a soil, sand, crushed stone, or replacement soil generated at the time of excavation of the trench, the connecting unit group wrapped by the water-permeable sheet 45 and the water collecting tub 43 and the inspection tub 44 are backfilled. Thus, the penetration trench T constituted by the connection unit group is buried under the building site (see FIG. 9).
[0035]
The function of the penetration trench T of this embodiment is basically the same as that of the conventional penetration trench. That is, the rainwater that has flowed into the catchment basin 43 when it rains is guided to the water conveyance path of the connected unit group via the conduit 46, and further distributed to each of the plurality of units 1 via this water conveyance path. You. In each unit 1, a part of the rainwater flowing through the water guide pipe part 10 constituting the water guide path flows down into the storage area inside the unit through the water guide opening 13, and the rainwater is temporarily stored therein. Since the water holes 6 are formed in the walls 2 to 5 constituting the frame of the unit, the water temporarily stored in the storage area also seeps into the soil through the water holes 6. By the basic function of the permeation trench T, much of the rainwater that has poured into a building or the like penetrates into the underground layer in the site, and discharge to the sewer or a river is reduced or suppressed as much as possible.
[0036]
Note that it is preferable to install a plurality of penetration trenches T in the site as shown in FIG. The number or total length of the infiltration trenches T is determined so as to have a processing capacity necessary to infiltrate the processing flow rate (water amount per unit time) calculated according to the guidance standard determined by the administrative organization. . However, if there is rainfall exceeding the processing capacity of the infiltration trench group, the overflow is discharged to sewerage or the like. Therefore, the arrangement level of the discharge pipe for discharging to the sewerage or the like is set higher than the arrangement level of the conduit 46 of each infiltration trench T. The arrangement form when a plurality of penetration trenches T are provided is not limited to the parallel arrangement as shown in FIG. 7, and a plurality of penetration trenches T may be arranged in series by connecting in a longitudinal direction.
[0037]
By providing the transfer mechanism (20, 25, etc.) as described above in the connecting unit 1 constituting the permeation trench T, the permeation trench T of the present embodiment has a function of cleaning the inside of the trench which is not provided in the conventional permeation trench. Was added. First, the necessity of cleaning is mentioned. Generally, rainwater is not pure water but a solid-liquid mixture containing fine earth and sand and foreign matters, and the water-permeable sheet 45 is a member through which solids cannot pass. For this reason, due to long-term use, solid intrusion such as dust gradually accumulates at the bottom of the storage area of each unit 1, and if left undisturbed, the storage area is buried with the solid intrusion and the rainwater treatment function of the penetration trench T is performed. May decrease. The transfer mechanism (20, 25, etc.) is provided to avoid such a situation.
[0038]
This transfer mechanism is used, for example, in a mode as shown in FIG. That is, when the rainwater accumulates in the permeation trench T and the check box 44 on the day after the rain, etc., the underwater pump 51 as a fluid flow generating means is dropped into the check box 44. The submersible pump 51 is connected to a hose 52, and an end of the hose 52 is guided above the water collecting tub 43. A filter means 53 (for example, a water-permeable sheet or a fine net) is arranged between the upper opening of the water collecting basin 43 and the end of the hose 52. Then, the submersible pump 51 is operated to suck up water from the inspection box 44, and the sucked water is returned to the water collecting box 43 after passing through the filter means 53. Then, with the flow of water returning from the inspection tub 44 to the water collecting basin 43 via the submersible pump 51, the hose 52 and the filter means 53, water enters the penetration trench T via the conduit 46, Along the transfer path constituted by the transfer pipe section 20 of each unit of the infiltration trench T, a flow of water is generated from the water collecting tub 43 to the check tub 44. As a result, circulation of water around the inside and outside of the permeation trench T occurs.
[0039]
As a result of the generation of a strong water flow in one direction in the transfer pipe section 20 of each unit 1, the strong water flow induces the dust collection opening 24 of the transfer pipe section 20 in the storage area of each unit 1. A secondary water stream is generated that is drawn to the water. Due to the influence of the secondary water flow, solid intruders trapped on the inner wall surface of the unit and solid intruders accumulated on the upper surface of the plate-shaped guide portion 25 are drawn to the dust collection opening 24, and pass therethrough, and the transfer pipe portion 20 passes therethrough. Drawn into. Then, the water is sucked into the inspection tub 44 on the strong water flowing in the transfer pipe portion 20. The solid entering material such as soil particles sucked into the inspection tub 44 reaches the filter means 53 via the submersible pump 51 and the hose 52, and is captured by the filter means 53, that is, is removed.
[0040]
As described above, the submerged pump 51 is used to forcibly generate a water flow in each transfer pipe portion 20 of the permeation trench T, so that the solid intruder that has entered the storage region of each unit 1 can be subjected to the permeation trench T. It can be transported out to clean the interior of the individual units 1.
[0041]
The cleaning operation using the transfer mechanism and the fluid flow generating means may be performed not only at the time of periodic inspection after the long-term use of the penetration trench T, but also at the time of newly establishing the penetration trench T. This is because dust and the like may enter the inside of each connecting unit 1 unexpectedly when the penetration trench T is constructed. In addition, since the plate-shaped guide portion 25 in each connection unit 1 has a slope, even when the suction action by the secondary water flow does not exist, the plate-shaped guide section 25 is captured based on the guide action by the slope. Naturally, it is possible to guide the solid inflow to the dust collection opening 24.
[0042]
Although FIG. 9 shows a method of cleaning the inside of the unit using water (liquid) as a carrier fluid, air (gas) is used as a carrier fluid and an air compressor or a blower pump is used as a fluid flow generating means. The same effect can be obtained by forcibly pumping or forcibly sucking air into each transfer pipe section 20 of the permeation trench T. In the case of using air, instead of circulating the fluid as described above, for example, a unidirectional airflow is generated along a transport path formed by each transfer pipe unit 20 and the airflow is generated in the storage area of each unit 1. The solid intruder that has entered may be collected at one of a plurality of units (for example, the unit 1 at the left end in FIG. 9 adjacent to the blind plug 49).
[0043]
(Effect) According to the present embodiment, the main part of the infiltration trench T having the water guide path can be easily constructed only by connecting a plurality of connection units 1 in which the water guide pipe parts 10 are integrated in series. Therefore, there is no need for a plumbing operation or a crushed stone laying operation as in the conventional trench method. Also, the weight of the connecting unit 1 is very light, about 5 kg, which makes the installation work much easier than when handling crushed stone. Therefore, the number of construction steps is significantly reduced as compared with the conventional trench method, and the penetration trench T can be installed efficiently and in a short time with very little labor.
[0044]
In the conventional infiltration trench, the porosity of the crushed stone layer was at most about 25 to 35%, whereas the internal porosity of the connecting unit 1 of the present embodiment was as high as about 95%, and this connecting unit 1 was used. The internal porosity in the infiltration trench T also shows almost the same percentage. For this reason, the storage capacity of rainwater per unit volume is dramatically improved as compared with the related art, and the size of the penetration trench can be reduced, the installation area can be reduced, and the installation cost can be reduced.
[0045]
Further, by providing the transfer mechanism in each connection unit 1, the inside of the penetration trench T can be appropriately cleaned without re-digging the ground after installation of the penetration trench T. For this reason, not only can the cost required for the maintenance management of the penetration trench T be significantly reduced, but also the effective life of the penetration trench T can be drastically extended.
[0046]
(Modification) The embodiment of the present invention may be modified as follows.
A convex portion (for example, a rib or a flange extending in a substantially horizontal direction) may be provided on the outer surface of the frame of the connecting unit 1 (for example, the outer surface of the side wall 2) to prevent floating due to earth pressure. According to this, even when the individual connecting units 1 are buried in the soil, when the earth pressure that causes the unit to float based on the specific gravity difference between the unit and the soil is generated, the floating prevention convex portion is provided. Since the unit is caught by the surrounding water-permeable sheet 45 (or soil) and opposes the buoyancy, the unit is prevented from rising.
[0047]
In the above-described embodiment, each unit is connected in a direction orthogonal to the unit connection direction (that is, in the left-right direction or the vertical Direction). Instead of or in addition to this, for example, a positioning portion (for example, an uneven portion) is formed at an edge of the four walls 2 to 4 constituting the periphery of the frame body, and a portion between two adjacent units 1 and 1 is formed. The respective units may be positioned in a direction orthogonal to the unit connecting direction (ie, in the left-right direction or the up-down direction) based on the mutual fitting of the positioning portions. In the above-described embodiment, a transfer mechanism is provided in each connection unit 1, but a connection unit without such a transfer mechanism may be used. In the case of such a unit having a simple design, the installation of the inspection tub 44 shown in FIGS. 7 to 9 is unnecessary.
[0048]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the connection unit for permeation trenches of this invention, a permeation trench can be efficiently constructed by using a small number of labor without using crushed stone etc. by connecting a plurality of said units in series. Further, since the internal area defined by the frame of the connecting unit is set as the storage area, the porosity inside the unit can be increased, and the storage capacity of rainwater or the like per unit volume can be increased as compared with the conventional case.
[0049]
ADVANTAGE OF THE INVENTION According to the construction method of the penetration trench of this invention, a penetration trench can be efficiently constructed with little effort, without using crushed stone. That is, compared to the conventional trench method using crushed stones, the number of work steps can be reduced to simplify the construction and save labor.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a connecting unit for a penetration trench.
FIG. 2 is a front view of the connection unit shown in FIG. 1;
3A is a sectional view taken along line AA of FIG. 2, and FIG. 3B is a side view of the connecting unit.
FIG. 4 is a plan view showing the upper surface of the connection unit.
FIG. 5 is a partial plan view showing a connection state of two units in a partially enlarged manner.
FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5;
FIG. 7 is a plan view showing a construction example of a penetration trench in a building site.
8 (A) to 8 (C) are cross-sectional views showing a procedure for forming a penetration trench.
FIG. 9 is a cross-sectional view showing a state after completion of construction of a penetration trench.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Connecting unit, 2 ... Left and right side walls, 3 ... Upper wall, 4 ... Lower wall, 5 ... Central wall (2-5 form a frame), 6 ... Water hole (water passage part), 10 ... Water guide pipe part, 13: water guide opening, 20: transfer pipe part, 24: dust collection opening, 25: plate-shaped guide part (20, 24 and 25 constitute a transfer mechanism), 45: water-permeable sheet, 51: submersible pump (Fluid flow generating means), T: penetration trench.

Claims (7)

A connection unit capable of forming a penetration trench by connecting a plurality of units,
A frame body that defines a storage area inside and that is provided with a water passage part for securing water flow from the storage area to the outside, and a water guide pipe part that is provided in the frame body and that can communicate with the storage area. It is configured so that it can be connected in series to other units arranged adjacent to the unit, and when connecting a plurality of units in series, it is possible to construct a series of water passages in the infiltration trench by each water pipe section A connection unit for a permeation trench, characterized in that: The water pipe section extends in the connection direction of the unit in an upper region of the storage area, and a wall of the water pipe section partially transfers water flowing through the water pipe section to the storage area. The connecting unit for a permeation trench according to claim 1, wherein a water introduction opening for guiding is formed. The water pipe section has a substantially cylindrical shape, and the inner and outer diameters are different at one end and the other end of the water pipe section. One end and the other end of the water pipe section of the other unit can be fitted to each other. Based on the mutual fitting, positioning of two adjacent units and interconnection of those water pipe sections are performed. The connection unit for a penetration trench according to claim 1 or 2, wherein the following is achieved. The positioning part for positioning each unit in the direction substantially orthogonal to the unit connection direction at the time of serial connection of a plurality of units is provided at the edge of the frame. 4. The connecting unit for a permeation trench according to any one of the above-described items. A transfer mechanism for transferring a solid intruder entering the frame to a specific place outside the unit or in the permeation trench is provided in a lower region of the storage region. 5. The connection unit for a penetration trench according to any one of 4. The transfer mechanism extends in the unit connection direction and is capable of constructing a series of transfer paths when a plurality of units are connected in series. The connection unit for a penetration trench according to claim 5, further comprising: a plate-shaped guide portion for guiding to the penetration trench. A frame body that defines a storage area inside and that is provided with a water passage part for securing water flow from the storage area to the outside, and a water guide pipe part that is provided in the frame body and can communicate with the storage area. Preparing a plurality of connecting units having, and arranging the plurality of connecting units in series connection in a groove formed by excavating the ground, covering the interconnected connection unit group with a permeable sheet, A connecting unit group covered with a water-permeable sheet is buried underground.

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