JP5457889B2 - Rainwater drainage system and method for installing rainwater drainage system - Google Patents

Description

  The present invention relates to a rainwater discharge system and a construction method of the rainwater discharge system.

  Conventionally, a rainwater storage tank or a rainwater infiltration tank (hereinafter simply referred to as a “rainwater tank”) is used to prevent a large amount of rainwater from flowing out from residential land into the rainwater main during a heavy rain. A rainwater discharge system including the above is used (for example, see Patent Document 1 below).

  By the way, there is a case where it is desired to construct a rainwater discharge system as described above by adding a rainwater tank to an existing pipeline. For example, there is a pipeline 110 as shown in FIG. 11A as an existing pipeline that allows rainwater to flow out from the residential land to the rainwater main outside the residential land. The pipe 110 is composed of an inflow pipe 101 connected to the main body 100, an outflow pipe 103 connected to the rainwater main pipe 104, and a head adjustment unit 102. The downstream end of the inflow pipe 101 is connected to the inlet of the head for adjusting the drop 102, and the upstream end of the outlet pipe 103 is connected to the outlet of the head for adjusting the head 102.

  When a rainwater tank is provided in such a pipe line 110, for example, the following method can be considered. That is, as shown in FIG.11 (b), the method which cut | disconnects a part of inflow pipe 101 and the outflow pipe 103, and installs the rainwater tank 105 among them can be considered. Note that reference numeral 106 is a frame disposed on the upstream side and the downstream side of the rainwater tank 105. Alternatively, as shown in FIG. 11C, a method of discarding the existing pipeline 110 and reconstructing a new pipeline 115 including the rainwater tank 105 is conceivable. That is, a method of replacing 100 with a new masu 100b and newly constructing a pipe 115 having an inflow pipe 107, a rainwater tank 105 and an outflow pipe 108 between the main 100b and the storm water main pipe 104. It is.

JP 2009-150512 A

  However, in the method of cutting a part of the inflow pipe 101 and the outflow pipe 103 and installing the rainwater tank 105 between them (see FIG. 11B), the construction takes time and effort. Further, if the distance between 100 and the rainwater main 104 is short, there is a problem that a space for installing the rainwater tank 105 cannot be secured between the 100 and the rainwater main 104.

  In the method of installing a new pipeline 115 in place of the existing pipeline 110 (see FIG. 11C), the work of removing the existing pipeline 110 is unnecessary and the problem of installation space hardly occurs. The inflow pipe 107 and the outflow pipe 108 must be newly installed. Therefore, this method also takes time and labor for construction. In addition, since the new inflow pipe 107 and the outflow pipe 108 are required, the cost of the members cannot be avoided.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a rainwater discharge system that can be constructed by using existing pipe lines, which saves labor and time required for construction. There is to do.

The rainwater discharge system according to the present invention includes a pipe line forming member formed with an inflow port, an outflow port, and an overflow port, and an inflow pipe line that is connected to the inflow port and guides rainwater toward the pipe line forming member. An outlet pipe connected to the outlet and for flowing out rainwater from the pipe forming member toward the storm water main pipe, and connected to the overflow port and overflowing to the outside of the pipe forming member through the overflow port An overflow pipe that guides rainwater, and a rainwater tank connected to a downstream end of the overflow pipe, wherein the overflow port is formed on a side surface of the pipe forming member, and is located at a lower end of the inlet Is higher than the position of the lower end of the overflow port, and the position of the lower end of the overflow port is higher than the position of the lower end of the outlet port.

  In the present specification, the “pipe” means a passage for guiding water. The pipe line may be constituted by a single pipe, but may be constituted by connecting a plurality of pipes via joints, masers or the like. The “pipe line forming member” refers to a member that forms part of the pipe line. Examples of the pipe forming member include a joint and the like. The “rainwater tank” includes, for example, a rainwater storage tank, a rainwater infiltration tank, and the like.

  In the rainwater discharge system described above, the amount of rainwater flowing from the inflow conduit into the conduit forming member is not so large during normal rain, so the rainwater does not flow into the overflow conduit but flows out exclusively into the outflow conduit. , Discharged into the rainwater main. On the other hand, in the case of heavy rain, a large amount of rainwater flows from the inflow pipe into the pipe forming member, but a part of the rainwater is led to the rainwater tank through the overflow pipe. Therefore, a large amount of rainwater is prevented from being discharged into the rainwater main. Even if rainwater flows backward from the rainwater main to the pipe forming member, the rainwater is guided to the rainwater tank through the overflow pipe. Therefore, the rainwater is prevented from flowing back into the inflow conduit.

  In addition, the rainwater discharge system, for example, for the existing inflow pipe, the pipe formation member, and the outflow pipe, for example, after forming an overflow port in the pipe formation member or replacing the pipe formation member, By constructing an overflow pipe and a rainwater tank, it can be constructed with relatively little effort and time. Therefore, it is possible to construct using existing pipelines while reducing the labor and time required for construction.

  In the rainwater discharge system, the position of the lower end of the inflow port may be higher than the position of the upper end of the overflow port, and the position of the lower end of the overflow port may be higher than the position of the upper end of the outflow port.

  Thereby, a large amount of rainwater is discharged into the rainwater main and the backflow of rainwater with respect to the inflow conduit is more reliably prevented.

  The conduit forming member is a substantially cylindrical body extending in a substantially vertical direction, the inflow port is formed on an upper surface or a side surface of the mast, and the outflow port is formed on a side surface or a lower surface of the mast. It may be.

  As a result, a large amount of rainwater is discharged into the rainwater main and the backflow of rainwater to the inflow conduit is more reliably prevented.

  The overflow line may include a trough with a filter.

  Thus, when foreign matter is mixed in rainwater flowing through the overflow pipe, the foreign matter is captured by the filter. Therefore, it is avoided that a foreign material flows into the rainwater tank. Therefore, the original performance of the rainwater tank can be maintained over a long period of time.

  In the construction method of the rainwater discharge system according to the present invention, an inflow port to which an inflow conduit for allowing rainwater to flow in is connected and an outflow port to which an outflow conduit for allowing rainwater to flow toward the main rainwater is connected. The lower end position of the inflow port is higher than the lower end position of the outflow port, whereas the lower end position is lower than the lower end position of the inflow port and lower than the lower end position of the outflow port. A step of forming a high overflow port, a step of providing a rainwater tank, and a step of forming a conduit connecting the first overflow port and the rainwater tank.

  In addition, although the process of connecting the said pipe line is performed after the process of forming the said overflow port, the order of said each process is not specifically limited about others. For example, the step of providing the rainwater tank may be performed before or after the step of forming the conduit.

  According to the construction method described above, the above-described rainwater discharge system can be constructed using the existing inflow pipeline, outflow pipeline, and masashi. Therefore, it is possible to construct the rainwater discharge system while reducing the labor and time required for construction and reducing the member cost.

  The construction method may further include a step of configuring at least a part of the pipe line by connecting the first pipe and the second pipe through a trough provided with a filter.

  Thereby, it can suppress that a foreign material flows in into a rainwater tank, and the original performance of a rainwater tank can be maintained over a long period of time.

  As described above, according to the present invention, it is possible to realize a rainwater discharge system that can reduce the labor and time required for construction and that can be constructed using existing pipelines.

It is a top view of a rainwater discharge system. It is the II-II sectional view taken on the line of FIG. It is a figure explaining the positional relationship of an inflow port, an outflow port, and an overflow port. It is a figure explaining the positional relationship of an inflow port, an outflow port, and an overflow port. It is a figure explaining the flow of rain water at the time of normal rain. It is a figure explaining the flow of rainwater at the time of heavy rain. It is a figure explaining the flow when rainwater flows backward from the rainwater main. It is a figure explaining the positional relationship of the inflow port which concerns on a modification, an outflow port, and an overflow port. FIG. 10 is a perspective view of a modified example. It is a perspective view of a branch joint. (A) is explanatory drawing of the existing pipeline, (b) and (c) are explanatory drawings of the conventional method of constructing a rainwater discharge system using the existing pipeline.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a rainwater discharge system 1 according to the present embodiment, and FIG. 2 is a cross-sectional view of the rainwater discharge system 1 along the vertical direction. As shown in FIG. 1, the rainwater discharge system 1 is a system in which a rainwater permeation tank 50 is provided via a pipe line 30 on a first pipe 20 connected to an inflow pipe 11 and an outflow pipe 12.

  As shown in FIG. 2, the inlet 20 and the outlet 22 are formed in the first 20. The inflow port 21 is connected to the downstream end of the inflow pipe 11, and the outflow port 22 is connected to the upstream end of the outflow pipe 12. The downstream end of the outflow pipe 12 is connected to the rainwater main pipe 13 (see FIG. 5). The rainwater discharge system 1 is embedded in the residential land except for a part of the outflow pipe 12 (that is, a connection portion with the rainwater main pipe 13). The rainwater main 13 is embedded outside the residential land. The inflow pipe 11 is a pipe that guides rainwater collected in the residential land toward the further 20. The outflow pipe 12 is a pipe that discharges rainwater from 20 toward the rainwater main pipe 13.

  As shown in FIG. 2, 20 is a so-called head adjustment. The outlet 22 is formed at a position lower than the inlet 21. Further, an overflow port 23 is further formed at a position lower than the inflow port 21 and higher than the outflow port 22. In this embodiment, as shown in FIG. 1, the inflow port 21 and the outflow port 22 are formed at positions facing each other in plan view. The overflow port 23 is formed at a position 90 degrees clockwise from the inlet 21 and 90 degrees counterclockwise from the outlet 22.

  The pipe line 30 guides a part of the rain water when a large amount of rain water flows into the inflow pipe 11 from the inflow pipe 11 to the rain water infiltration tank 50 or a part of the rain water flowing back from the outflow pipe 12 to the main pipe 20. The pipe line 30 includes a pipe 31, a mass 33, a pipe 32, an elbow 35, and a joint 36. The upstream end of the pipe 31 is connected to 20 more overflow ports 23. The downstream end of the pipe 31 is connected to 33 inlets 33a. The upstream end of the pipe 32 is connected to 33 outlets 33b. The downstream end of the pipe 32 is connected to the rainwater infiltration tank 50 through an elbow 35 and a joint 36.

  As shown in FIG. 2, a filter 34 is provided inside the first 33. In the present embodiment, the filter 34 is detachably attached and is disposed so as to cover the outflow port 33b. However, the attachment position and shape of the filter 34 are not limited at all. When foreign matter is contained in the rainwater flowing into the pipe 33 from the pipe 31, the foreign matter is captured by the filter 34. This prevents foreign matter from flowing into the rainwater infiltration tank 50.

  FIG. 3 is a diagram illustrating the height relationship among the inflow port 21, the outflow port 22, and the overflow port 23. As shown in FIG. 3, in this embodiment, the inflow port 21, the overflow port 23, and the outflow port 22 are formed in the position which does not mutually overlap regarding an up-down direction. Specifically, the position of the lower end 21 b of the inflow port 21 is higher than the position of the upper end 23 t of the overflow port 23. The position of the lower end 23 b of the overflow port 23 is higher than the position of the upper end 22 t of the outflow port 22. However, the positional relationship between the inflow port 21 and the overflow port 23 and the positional relationship between the overflow port 23 and the outflow port 22 are not limited to the above-described positional relationship. For example, as shown in FIG. 4, the position of the lower end 21 b of the inflow port 21 may be lower than the position of the upper end 23 t of the overflow port 23. Further, the position of the lower end 23 b of the overflow port 23 may be lower than the position of the upper end 22 t of the outflow port 22.

  As shown in FIG. 2, the rainwater infiltration tank 50 includes a plurality of storage materials 51 and a water-permeable sheet 52 that covers the periphery of the storage materials 51. The storage material 51 is configured by a hollow body in which a large number of holes 51a are formed. A plurality of storage materials 51 are arranged in the front-rear direction, the left-right direction, and the up-down direction. However, the kind of the storage material 51 is not limited at all, and the arrangement method of the storage material 51 is not limited at all. As described above, since the plurality of storage materials 51 made of a hollow body are covered with the water permeable sheet 52, rainwater can be stored in the space between the storage materials 51 and the adjacent storage materials 51. Rainwater can penetrate into the ground through the water permeable sheet 52.

  The above is the configuration of the rainwater discharge system 1. Next, the function of the rainwater discharge system 1 will be described with reference to FIGS. 5 and 6.

  As described above, the overflow port 23 is formed at a position higher than the outflow port 22 (see FIG. 2). Therefore, when the amount of rainwater flowing into the inlet pipe 11 from the inflow pipe 11 is small as in normal rain, the water level in the tank 20 becomes lower than the lower end 23 b of the overflow port 23. As a result, as shown in FIG. 5, the rainwater in 20 will not flow into the pipe 31 but will be exhausted exclusively through the outflow pipe 12 to the rainwater main pipe 13.

  On the other hand, during heavy rain, a large amount of rainwater flows from the inflow pipe 11 into the water 20, and the water level in the water 20 becomes higher than the lower end 23 b of the overflow port 23. As a result, as shown in FIG. 6, the rainwater in the water 20 flows into the pipe 31 as well as the outflow pipe 12. Therefore, part of the rainwater is discharged to the rainwater main 13 and the remaining rainwater is discharged to the rainwater infiltration tank 50. Therefore, it is possible to suppress an excessive amount of rainwater from being discharged to the rainwater main pipe 13.

  In addition, as shown in FIG. 7, during heavy rain, rainwater in the rainwater main 13 may flow back toward 20 further. However, in such a case, the rainwater that has flowed into 20 is discharged to the rainwater infiltration tank 50 through the pipe 31. Therefore, even if the rainwater flows back to 20, the rainwater can be prevented from flowing back toward the inflow pipe 11.

  Next, the construction method of the rainwater discharge system 1 will be described. The rainwater discharge system 1 according to the present embodiment can be newly installed in a place where piping or the like is not installed, and can also be constructed using an existing pipeline. In the following, the inflow pipes 11 and 20 (assuming that the overflow port 23 is not formed) and the outflow pipes 12 are already installed in the places where the outflow pipes 12 are already installed. 20 and a method of constructing the rainwater discharge system 1 using the outflow pipe 12 will be described. However, the method described below is only an example of a construction method of the rainwater discharge system 1, and it is needless to say that the rainwater discharge system 1 may be constructed by other methods. Further, the order of the steps described below is not limited at all, and may be changed as appropriate.

  First, the overflow port 23 is formed in the first 20. If the first 20 is made of resin, the overflow port 20 can be easily formed. Next, the rainwater infiltration tank 50 is installed. Specifically, a hole is formed by digging the ground, and a water permeable sheet 52 is laid in the hole, and then a plurality of storage materials 51 are arranged on the water permeable sheet 52. Then, the storage material 51 is covered with a water-permeable sheet 52. Thereby, the rainwater infiltration tank 50 is completed. Next, the pipe line 30 is installed. For example, one end of the joint 36 (see FIG. 2) is connected to the rainwater infiltration tank 50, and the elbow 35 is connected to the other end of the joint 36. In addition, a mass 33 is installed between the mass 20 and the rainwater infiltration tank 50. Then, one end of the pipe 31 is connected to 20 overflow ports 23 and the other end of the pipe 31 is connected to 33 inlets 33a. Further, one end of the pipe 32 is connected to 33 outlets 33 b and the other end of the pipe 32 is connected to the elbow 35. Thereby, construction of the rainwater discharge system 1 is completed.

  As described above, according to the rainwater discharge system 1, in the event of heavy rain, not all rainwater that has flowed into the rainwater 20 is discharged to the rainwater main 13, but a part of rainwater is discharged to the rainwater infiltration tank 50. Therefore, the amount of rainwater discharged to the rainwater main 13 can be suppressed. In addition, when rainwater flows backward from the rainwater main 13 to 20, the rainwater can be discharged into the rainwater infiltration tank 50. Therefore, it is possible to prevent rainwater from flowing back into the inflow pipe 11. Therefore, it is possible to prevent rainwater from overflowing from a drainage facility (not shown) located on the upstream side of the inflow pipe 11.

  Moreover, the rainwater discharge system 1 can be constructed using an existing pipeline. Therefore, the rainwater discharge system 1 can be constructed while reducing the labor and time required for construction. Moreover, according to the rainwater discharge system 1, it is not necessary to install the rainwater permeation tank 50 on the existing pipe line (that is, on the line connecting the first 15, the inflow pipe 11, the first 20 and the outflow pipe 12 in FIG. 5). . Therefore, the rainwater discharge system 1 can be constructed even if the installation space for the rainwater infiltration tank 50 cannot be secured on the existing pipeline.

  Moreover, according to the rainwater discharge system 1, since the rainwater collected in the residential land is not always discharged to the rainwater infiltration tank 50, the use frequency of the rainwater infiltration tank 50 can be suppressed. Therefore, the maintenance frequency of the rainwater infiltration tank 50 can be reduced.

  In the present embodiment, the position of the lower end 21b of the 20 inflow ports 21 is higher than the position of the upper end 23t of the overflow port 23, and the position of the lower end 23b of the overflow port 23 is higher than the position of the upper end 22t of the outflow port 22. Therefore, it is possible to more reliably prevent a large amount of rainwater from being discharged to the rainwater main pipe 13 and flowing back into the inflow pipe 11.

  Further, in the present embodiment, a slat 40 having a filter 34 is installed between the slat 20 and the rainwater infiltration tank 50. Therefore, it is possible to prevent foreign matters contained in the rainwater from flowing into the rainwater infiltration tank 50. Therefore, deterioration of the performance of the rainwater infiltration tank 50 is suppressed, and the original performance of the rainwater infiltration tank 50 can be maintained for a long time.

  As described above, the positional relationship among the inflow port 21, the outflow port 22, and the overflow port 23 in the first 20 is not limited to that of the above embodiment (see FIG. 3). It is only necessary that the position of the lower end 21b of the inflow port 21 is higher than the position of the lower end 23b of the overflow port 23 and the position of the lower end 23b of the overflow port 23 is higher than the position of the lower end 22b of the outflow port 22. The position difference h1 between the lower end 21b of the inflow port 21 and the upper end 23t of the overflow port 23 may be equal to the difference h2 between the position of the lower end 23b of the overflow port 23 and the upper end 22t of the outflow port 22. As shown, h1 may be greater than h2. In this way, if the overflow port 23 is provided below the intermediate position between the inlet 21 and the outlet 23, compared with the case where the overflow port 23 is provided at the intermediate position, the inside of 20 From the time when the water level is lower, more and more rainwater in 20 can be discharged into the rainwater infiltration tank 50. That is, drainage can be discharged more positively from the rainwater infiltration tank 50. However, the position of the overflow port 23 can be appropriately set in consideration of the balance between the amount of drainage with respect to the rainwater main 13 and the amount of drainage with respect to the rainwater infiltration tank 50 in heavy rain. The position of the overflow port 23 is not limited at all.

  The shapes and dimensions of the inflow port 21, the outflow port 22, and the overflow port 23 are not limited at all. For example, although the dimension of the overflow port 23 may be the same as each dimension of the inflow port 21 and the outflow port 22, it may be smaller or larger than them. In addition, if the dimension of the overflow port 23 is enlarged, the rainwater in 20 can be discharged | emitted more actively with respect to the rainwater penetration tank 50 more. However, the dimensions of the overflow port 23 can also be set appropriately in consideration of the balance between the amount of drainage with respect to the rainwater main 13 and the amount of drainage with respect to the rainwater infiltration tank 50.

  In the said embodiment, all of the inflow port 21, the outflow port 22, and the overflow port 23 were formed in 20 side surfaces. However, as shown in FIG. 9, the inflow port 21 may be formed on the upper surface 20 a of the first 20. Moreover, the outflow port 22 may be formed in the lower surface of 20. In the example shown in FIG. 9, reference numeral 20 denotes a so-called drop having an open bottom, and the outlet 22 is formed on the entire lower surface of the base 20.

  In the above-described embodiment, the number of pipe forming members formed with the inlet 21, the outlet 22, and the overflow 23 is 20. However, the pipe line forming member according to the present invention is not necessarily limited to 20. For example, as shown in FIG. 10, a T-shaped branch joint 40 may be used as a pipe line forming member in which an inflow port 21, an outflow port 22, and an overflow port 23 are formed. Moreover, it is also possible to use a branch joint or the like having another shape as the pipe line forming member.

  In the above embodiment, the existing inflow pipe 11, outflow pipe 12, and 20 are used for the construction of the rainwater discharge system 1. However, it is also possible to replace the existing trout with another trout while diverting the inflow pipe 11 and the outflow pipe 12. For example, an existing trough with an inlet and an outlet formed therein may be replaced with a new trout 20 with an inlet 21, an outlet 22 and an overflow port 23 formed therein. Even in this new mass 20, the position of the lower end 21b of the inflow port 21 is higher than the position of the lower end 23b of the overflow port 23, and the position of the lower end 23b of the overflow port 23 is higher than the position of the lower end 22b of the outflow port 22. Is also expensive. In this case, more replacement work is required, but the work of forming the overflow port 23 is unnecessary. If the work of exchanging more than the work of forming the overflow port 23 is easier depending on the situation of the construction site, the mud may be exchanged in this way.

  In the said embodiment, the rainwater infiltration tank 50 comprised from the some unit member (namely, storage material 51) and the water-permeable sheet 52 was used as a rainwater tank. However, the rainwater tank may be a rainwater infiltration tank having another structure. Moreover, the rainwater tank which concerns on this invention is not restricted to the rainwater tank which has the function to permeate | store the stored rainwater in the ground, ie, a rainwater penetration tank. As the rainwater tank, it is also possible to use a rainwater storage tank that does not allow rainwater to penetrate into the ground.

1 Rainwater discharge system 11 Inflow pipe (inflow pipe line)
12 Outflow pipe (outflow pipeline)
20 Mas (pipe forming member)
21 Inflow port 22 Outlet port 23 Overflow port 30 Pipe line (overflow line)
31 tubes (first tube)
32 tubes (second tube)
33 Masu 34 Filter 50 Rainwater penetration tank (rainwater tank)

Claims (6)

A conduit forming member in which an inflow port, an outflow port, and an overflow port are formed;
An inflow conduit connected to the inflow port for guiding rainwater toward the conduit formation member;
An outflow line connected to the outflow port and for causing rainwater to flow out from the pipe line forming member toward the rainwater main;
An overflow pipe connected to the overflow port and guiding rainwater overflowing to the outside of the pipe line forming member through the overflow port;
A rainwater tank connected to the downstream end of the overflow pipe,
The overflow port is formed on a side surface of the pipe line forming member,
The position of the lower end of the inflow port is higher than the position of the lower end of the overflow port,
The rainwater discharge system, wherein a position of a lower end of the overflow port is higher than a position of a lower end of the outlet. The position of the lower end of the inflow port is higher than the position of the upper end of the overflow port,
The rainwater discharge system according to claim 1, wherein a position of a lower end of the overflow port is higher than a position of an upper end of the outflow port. The pipe forming member is a substantially cylindrical body extending in a substantially vertical direction,
The inlet is formed on the top or side of the trough;
The rainwater discharge system according to claim 1 or 2, wherein the outlet is formed on a side surface or a lower surface of the trout.   The rainwater discharge system according to any one of claims 1 to 3, wherein the overflow line includes a trough with a filter. An inflow port connected to an inflow conduit for flowing rainwater and an outflow port connected to an outflow conduit for flowing rainwater toward the stormwater main are formed, and the position of the lower end of the inflow port is the outlet Forming an overflow port whose lower end position is lower than the lower end position of the inlet and higher than the lower end position of the outlet;
Providing a rainwater tank;
Forming a pipe connecting the overflow port and the rainwater tank;
Method of rainwater drainage system equipped with.   6. The storm drainage system of claim 5, further comprising the step of configuring at least a portion of the conduit by connecting the first tube and the second tube through a trough comprising a filter. Construction method.

Images