JP2010127020A - Rainwater drain pipe structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater drain pipe structure capable of relieving a city type flood by gradually making rainwater fallen in housing land flow out to a side ditch and a rainwater drain main pipe of a road, after being temporarily stored in a pipe. <P>SOLUTION: This rainwater drain pipe structure is provided by connecting a rainwater basin 1 and a rainwater basin 1 by a drain pipe 2, and a dam 3 for temporarily storing the rainwater flowed in the pipe, is arranged in an inflow port 1a of the rainwater basin 1 positioned on the downstream side or in a drain pipe 2 end part connected to the inflow port 1a of the rainwater basin 1 positioned on the downstream side, and a hole 3a is bored for gradually draining the rainwater temporarily stored in its dam 3. After the rainwater is temporarily stored by damming up the rainwater by the dam 3 arranged in the inflow port 1a of the rainwater basin 1 positioned on the downstream side or in the drain pipe 2 end part connected to the inflow port 1a of the rainwater basin 1 positioned on the downstream side, the temporarily stored rainwater is gradually drained to the rainwater drain main pipe 9 via the rainwater basin 1 from the hole 3a arranged in the dam 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rainwater drainage piping structure that reduces the load on rivers and sewer facilities during heavy rain.

  In recent years, roads and vacant lots (parking lots, etc.) have been paved rapidly, and urbanized areas with few unpaved parts are increasing. In such areas, rainwater hardly flows into the ground and flows into rivers through road gutters and sewer drains, etc., and so-called urban flooding occurs beyond the river capacity in a short time, causing social problems. It has become. This problem is expected to become increasingly serious with the recent extreme weather, which is said to be caused by global warming.

  In order to alleviate such a problem, an overflow member is disposed between the final rainwater basin in the residential land and the public rainwater basin with its lower edge positioned above the residential water collection route. A residential rainwater storage system has been proposed that allows a certain amount of rainwater to be stored in the final rainwater basin and in the house water collection route (Patent Document 1).

In this residential rainwater storage system, an orifice is formed in the overflow member according to the height of the residential water collection channel, and the rainwater stored in the final rainwater tank and residential water collection channel in the residential land is gradually discharged from the orifice. It is supposed to be. As a result, it is possible to suppress the rainwater that has fallen on the house from flowing into the side ditches of the road and the sewer drain pipe through the in-house water collecting route at once, and to reduce the load on the river and the sewerage facility during the heavy rain.
JP 2006-169774 A

  However, in the residential rainwater storage system, the overflow member disposed between the final rainwater tank in the residential land and the public rainwater tank is composed of an upstream joint member, a downstream joint member, a straight PVC pipe, and a thin PVC pipe. There was a problem that it was configured and cost was high due to the large number of parts. In addition, in order to arrange this overflow member between the existing final rainwater catchment in the residential land and the public rainwater catchment, a large-scale civil engineering work such as excavation of the ground and a change of piping is required, so the cost is increased. In addition, there is a problem that the construction period becomes very long. Further, if the orifice for discharging the stored rainwater is clogged, civil engineering work is required in the same manner as the overflow member is provided, so that there is a problem that maintenance is very difficult. In particular, this residential rainwater storage system has a structure in which a PVC straight pipe that discharges rainwater overflowing from the upstream joint member to the downstream joint member is located above the in-house water collection path (see FIG. 1). In addition, rainwater flows into the overflow member only in rare cases such as typhoons, and normal rain discharges only from the orifice and imposes a burden, so the orifice is easily clogged and maintenance is difficult. This is a problem that cannot be ignored.

  The present invention has been made in view of the above problems, and the problem to be solved is to temporarily store rainwater that has fallen in the residential land in the pipe, and then gradually drain it into the side gutter of the road or the rainwater drainage main. The purpose is to provide a rainwater drainage piping structure that can alleviate urban flooding and is easy to construct and maintain.

  In order to achieve the above object, a rainwater drainage pipe structure according to the present invention is a rainwater drainage pipe structure in which a rainwater tank and a rainwater tank are connected by a drainage pipe, and is an inflow or downstream of a rainwater tank located downstream. A weir for temporarily storing rainwater that has flowed into the pipe is provided at the end of the drain pipe connected to the inlet of the rainwater tank located on the side, and the rainwater temporarily stored in the weir is gradually discharged. The hole is perforated.

  In the rainwater drainage piping structure of the present invention, the bottom of the hole is the bottom of the drainage pipe inlet located on the downstream side or the drainage pipe end connected to the downstream side of the rainwater drainage inlet. The height is preferably the same as the tube bottom. In addition, it is preferable that the dam is detachably provided, and the dam is provided at the inlet of the rainwater basin located on the downstream side or the drain pipe end connected to the inlet of the stormwater basin located on the downstream side. More preferably, it is provided so as to be detachable via an attached mounting member. Furthermore, a rainwater drainage pipe structure in which weirs are provided in a watertight manner is preferable.

The rainwater drainage pipe structure of the present invention is designed to stop rainwater by a dam provided at the end of a drainage pipe connected to the inlet of a stormwater basin located on the downstream side or the inlet of the stormwater basin located on the downstream side. The rainwater upstream from the weir is temporarily stored. Thus, a certain amount of rainwater is temporarily stored in the pipe upstream of the weir, so that a large amount of rainwater can be prevented from flowing into the river at a stretch. When the rain stops, the rainwater temporarily stored in the pipe is gradually discharged from the hole provided in the weir to the rainwater drainage main through the rainwater tank and can be prepared for the next rain. Since this rainwater drainage pipe structure is open above the weir, in the case of a heavy rain such as a typhoon, the rainwater is discharged from the opening and the inside of the pipe becomes full without forcibly blocking the rainwater flow. There is no worry that the rainwater overflows from the rainwater tank located upstream.
On the other hand, when constructing, only a weir is provided at the end of the drainage pipe connected to the inlet of the rainwater tank located on the downstream side or the inlet of the rainwater tank located on the downstream side. Even if it is not necessary, it can be easily retrofitted to existing rainwater drainage pipes, and it can be carried out with a simple construction in a short period of time, thereby reducing the cost.

  In addition, the bottom of the hole is the same height as the pipe bottom of the rainwater tank inlet located on the downstream side or the pipe bottom of the drain pipe end connected to the rainwater tank inlet located on the downstream side. The rainwater drainage pipe structure has a hole for gradually discharging rainwater temporarily stored at this position, so that all rainwater temporarily stored in the pipe can flow out without stagnation. Can be prepared for the next rain in the air.

  Furthermore, the rainwater drainage pipe structure with the dams being detachable allows maintenance of the rainwater drainage pipes such as holes for draining rainwater and drainage pipes connecting the rainwater tanks and rainwater tanks by making the dams removable. Becomes easier.

  In particular, the weir is detachably provided via an attachment member attached to the end of the drainage pipe connected to the inflow port of the rainwater tank located on the downstream side or the inflow port of the rainwater tank located on the downstream side. For example, when a groove for attaching a dam is formed on the attachment member, the storm water drainage pipe structure can prevent the dam from being washed away by rainwater only by inserting the dam into the groove. It becomes like this.

  In addition, like the rainwater drainage pipe structure where the weir is provided in a watertight manner, it is connected to the inflow of the rainwater basin located on the downstream side with the dam or the inflow of the rainwater basin located on the downstream side of the weir By preventing the outflow of rainwater from the boundary with the drain pipe end, rainwater can be temporarily stored more reliably to prevent rainwater outflow and reduce the load on rivers and sewerage facilities. .

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a schematic perspective view showing a rainwater drainage pipe structure according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing the main part of the pipe structure, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. FIG. 5 shows a weir used in a piping structure, where (a) is a front view, (b) is a plan view, and FIG. 5 shows a state in which an attachment member used in the piping structure is attached to a drain pipe connected to a rainwater basin. FIG. 6 is a front view showing a state in which a weir is attached to the attachment member.

  As shown in FIG. 1, the rainwater drainage pipe structure of the present invention (hereinafter simply referred to as a pipe structure) has two or more rainwater troughs 1 connected by a drainage pipe 2, and these drainage pipes are connected via a joint 8. A weir 3 is provided at the end of a drainage pipe 2 connected to a rainwater trough 1 located on the most downstream side in the residential land connected to a public rainwater drainage main 9 or a gutter (not shown). Is.

  In this piping structure, rainwater that has fallen on the house 7 in the residential land flows down the roof 7a of the house 7 and flows into the eaves 5 provided around the roof 7a. Water is collected from the drain pipe 2 to the rainwater trough 1 and discharged to the river and sewerage facilities through the public rainwater drain main pipe 9. Further, as shown in FIG. 3, since a large number of permeation holes 1c are formed in the lid body 1B of the rainwater tank 1, rainwater that has fallen into the residential land (such as a garden) also passes through the permeation hole 1c. It flows into rivers and sewerage facilities.

The rainwater tank 1 used in the above-described piping structure is provided with an inlet 1a and an outlet 1b by drilling holes in the main body 1A of the rainwater tank 1 with a hole saw or the like. As shown in FIG. An annular seal packing 1d for improving water tightness is attached to the inlet 1a and the outlet 1b, respectively. And as shown in FIG. 2, it is 1/100 to 3/100 from the upstream to the downstream to the inflow port 1b of the storm basin 1 located on the upstream side and the inflow port 1a of the storm basin 1 located on the downstream side. The rainwater tank 1 and the rainwater tank 1 are connected in a watertight manner by inserting the drain pipe 2 with a flow gradient of a certain degree.
In addition, although a rainwater tank in which the inlet 1a and the outlet 1b are previously drilled may be used, the degree of freedom of piping can be obtained by drilling the inlet 1a and outlet 1b at the construction site as in this embodiment. Is preferable.
Moreover, although it does not specifically limit about the material of the rain water tank 1, The thing made from a polypropylene resin is used suitably when durability or construction property are considered.

  The piping structure of the present invention is located at the most downstream side in the residential land in order to prevent rainwater from flowing into the river or sewerage facilities at a time in the case of a heavy rain such as a typhoon. A dam 3 for temporarily storing rainwater, which will be described below, in the pipe is provided at the end of the drain pipe 2 connected to the inlet 1a of the rainwater tank 1 to be operated.

  That is, the weir 3 provided at the end of the drain pipe 2 connected to the inflow port 1a of the storm sewer 1 located on the most downstream side, as shown in FIGS. 4 (a), 4 (b), and 6, A semicircular plate that closes the lower half of the opening of the drainage pipe 2, and a protrusion 3 b that fits into a groove 4 a of a mounting member 4, which will be described later, projects from the outer peripheral surface of the plate. In addition, one small-diameter hole 3 a for gradually discharging rainwater temporarily stored in the weir 3 is formed in the lower portion of the weir 3. As shown in FIG. 3, the hole 3a drilled in the weir 3 has the same bottom as the bottom of the drainage pipe 2 connected to the inflow port 1a of the rain gutter 1 located downstream. By forming a hole 3a at this position, all the rainwater temporarily stored in the pipe is discharged without stagnation, and the pipe upstream of the weir 3 again until the next rain It will be possible to temporarily store rainwater inside.

The weir 3 configured as described above is detachably provided at the end of the drain pipe 2 via a mounting member 4 to be described later, and temporarily stores rainwater that has fallen into the residential land in a pipe upstream of the weir 3. This prevents rainwater from flowing into rivers and sewerage facilities at once. Therefore, if the diameter of the hole 3a drilled in the weir 3 is too large, the rainwater temporarily stored in the pipe upstream of the weir 3 is expelled from the hole 3a, and the effect of suppressing the outflow of rainwater is reduced. This is not preferable. On the other hand, if the diameter of the hole 3a is too small, the amount of rainwater outflow will be too small and the rainwater will not be discharged sufficiently, and the rainwater temporarily stored upstream from the weir 3 will lose its place and overflow from the weir 3 Since it will be discharged | emitted from the part 12, the effect which suppresses the outflow of rainwater will decrease. Furthermore, if the diameter of the hole 3a is too small, there is a problem that the hole 3a is easily clogged with dust and the like. Therefore, in consideration of these, the diameter of the hole 3a is formed to be about 3 to 20 mm.
Although only one hole 3a is perforated in the weir 3 of this embodiment, a plurality of perforations may be perforated by reducing the diameter of the hole 3a. Moreover, if the bottom part of the hole 3a is the same height as the pipe bottom of the drainage pipe 2, a shape will not be limited circularly, For example, you may drill in a shape like a crescent moon.

  Further, when the shape of the weir 3 is made closer to a circular shape than the semicircular shape and the opening portion 12 is made smaller, the amount of storage on the upstream side of the weir 3 is increased, and the outflow of rainwater can be further suppressed. If the weir 3 having the large portion 12 is formed, the amount of temporary storage of rainwater can be reduced. Furthermore, since the amount of rainwater outflow can be adjusted by changing the shape and size of the hole 3a drilled in the weir 3, a piping structure that matches the construction area (region where there is a lot of rain or a region where there is little rain). Can be provided easily.

  The attachment member 4 for providing the weir 3 having the above-described configuration at the end of the drain pipe 2 has a hoof-like shape as shown in FIGS. A recessed groove 4a is formed to be fitted to the protruding ridge 3b projecting from the outer peripheral surface of 3. A semi-annular packing 4b is fitted into the concave groove 4a. By fitting the semi-annular packing 4b into the concave groove 4a in this way, the water tightness is improved, and the weir 3 is attached to the mounting member 4. When attached, rainwater can be prevented from leaking from the gap, so that rainwater can be reliably temporarily stored in the pipe upstream of the weir 3.

  As shown in FIG. 5, the attachment member 4 is watertightly attached by applying an adhesive or the like to the end of the drain pipe 2 connected to the inflow port 1a of the rainwater tank 1 located on the most downstream side. It is done. Then, when the protrusion 3b of the weir 3 described above is inserted into the concave groove 4a of the attachment member 4 from above, the protrusion 3b and the concave groove 4a are fitted, and the weir 3 can be easily attached to the attachment member 4. it can. Moreover, since the ridges 3b and the recessed grooves 4a are securely fitted, there is no fear that the weir 3 is pushed by the rainwater flow and is detached from the mounting member 4. On the other hand, since the weir 3 can be easily removed from the mounting member 4 simply by pulling it upward, the rain 3 is discharged from the hole 3a, the drainage pipe 2 connecting the rainwater tank 1 and the rainwater tank 1 and the dust collected in the weir 3. Maintenance inside the piping, such as cleaning, can be performed easily.

As described above, the weir 3 which is the main part of the piping structure of the present invention is detachably provided at the end of the drain pipe 2 connected to the rainwater trough 1 located on the most downstream side via the attachment member 4. It has been. When the weir 3 is provided at the end of the drain pipe 2, as shown in FIGS. 2 and 6, the lower half of the opening of the drain pipe 2 is blocked by the weir 3 to stop the rain water. Temporary storage in upstream piping. As described above, when rainwater is temporarily stored in the pipe upstream of the weir 3, a large amount of rainwater flows into the river or sewerage facility through the rainwater drainage main 9 at a time of heavy rain such as a typhoon. It will be possible to mitigate urban floods. Even if the weir 3 is provided, the upper part of the weir 3 is open as described above. Therefore, during a heavy rain such as a typhoon, rainwater is discharged from the opening 12 and the inside of the pipe is filled with water. Therefore, there is no worry that the stormwater tank 1 located upstream will overflow and the rainwater will flow backward. On the other hand, when the rain stops, the rainwater temporarily stored in the pipe is gradually discharged from the hole 3a provided in the weir 3 to the rainwater drain main 9 through the rainwater trough 1 and the pipe becomes empty water. So you can prepare for the next rain.
In addition, when the dam without a hole is provided at the end of the drain pipe 2, the rainwater temporarily stored in the pipe does not flow out gradually, so that water can be easily taken from the rainwater trough 1, Needless to say, the stored rainwater can be effectively used for garden watering.

Moreover, said dam 3 can also be provided in the edge part of the drain pipe 2 via the attachment member 40 as shown in FIG. The mounting member 40 extends from the end face of the drain pipe 2 to the downstream side of the mounting member 4 to form a concave groove 4a that fits with the ridge 3b of the weir 3 and a semi-annular packing 4b that improves water tightness. Is formed by shifting from the end face of the drain pipe 2 to the downstream side. The attachment member 40 is extended while providing a step so that a space in which rainwater accumulates does not occur when the attachment member 40 is attached to the end of the drain pipe 2. Thus, when the weir 3 is attached to the attachment member 40, the bottom of the hole 3a is at the same height as the bottom of the drainage pipe 2.
Since the other structure of this attachment member 40 is the same as that of the attachment member 4 mentioned above, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

  If the dam 3 is provided using the mounting member 4 described above, the opening cross-sectional area of the drain pipe 2 is half blocked, but the dam 3 is provided at the end of the drain pipe 2 using the mounting member 40 described above. Since the weir 3 is shifted from the end face of the drainage pipe 2 to the downstream side, in addition to the half of the opening cross-sectional area of the drainage pipe 2, an area corresponding to the shifted amount when viewed from above opens and the opening portion 12 Therefore, it is not necessary to reduce the opening cross-sectional area of the drain pipe 2. That is, it is possible to obtain an effect that the rainwater that overflows from the opening portion 12 is hardly inhibited while temporarily storing the rainwater. In order to further increase the effect, the upper portion of the weir 3 may be tilted downstream to provide the weir 3 (not shown).

  The weir 3 used in the pipe structures of the above two embodiments is provided at the end of the drainage pipe 2, but at the end of the drainage pipe 2 connected to the public rainwater basin 10 as shown in FIG. Cannot be established. The public rainwater tank 10 shown in FIG. 8 has an inlet 10a and an outlet 10b protruding from the main body 10A. When the drain pipe 2 is connected to the public rainwater tank 10, the drain pipe 2 Since the end portion comes into contact with the insertion port 11a formed at the tip of the inflow port 10a, the public rainwater tank 10 of this type is attached to the weir 30 shown in FIGS. The member 41 may be used.

The weir 30 shown in FIGS. 9A and 9B is formed in a substantially reverse convex shape in plan view so as not to interfere with the engagement protrusion 4d of the attachment member 41 when attached to the attachment member 41 described later. This is a semicircular plate similar to the weir 3 described above, and a protrusion 3b projects from the outer peripheral surface thereof. In addition, a hole 3a is formed in the lower part.
When the dam 30 is provided at the inflow port 10a of the public rainwater basin 10 as in this embodiment, the bottom of the hole 3a of the dam 30 and the pipe bottom of the inflow port 10a of the public stormwater basin 10 have the same height. Need to be drilled.
Since the other structure of this dam 30 is the same as that of the dam 3 mentioned above, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

As shown in FIGS. 10 and 11, the mounting member 41 for providing the dam 30 on the rainwater basin 10 abuts the outer peripheral surface of the mounting member 4 described above on the peripheral surface of the inlet 10 a on the inner surface of the rainwater basin 10. An engagement protrusion 4d that is inserted into and engaged with the inflow port 10a is formed on the inner periphery of the flange portion 4c and the mounting member 4 described above. This engagement protrusion 4d is divided not at the entire inner peripheral surface of the attachment member 41 but at two places so as not to hinder the flow of rainwater when the attachment member 41 is attached to the inflow port 10a of the rainwater trough 10. Is provided.
Since the other structure of this attachment member 41 is the same as that of the attachment member 4 mentioned above, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

The weir 30 and the attachment member 41 first apply an adhesive to the flange portion 4c of the attachment member 41, insert the engagement protrusion 4d into the inflow port 10a of the public rainwater basin 10, and engage with it. The attachment member 41 is attached to the root portion of the inflow port 10a (the main body 10A side) by bringing the eaves portion 4c into contact with the peripheral surface of the inflow port 10a of the rainwater basin 10 of the rainwater basin. And the weir 30 is attached to the attachment member 41 by inserting the protrusion 3b of the weir 30 from above into the groove 4a of the attachment member 41, and fitting the protrusion 3b and the groove 4a. If it does in this way, like the above-mentioned public rainwater tank 10, the weir 30 can be provided detachably also in the rainwater tank in which the inflow port 10a protruded.
Although not shown, the mounting member 41 is also formed so that the weir 30 can be shifted from the root portion of the inflow port 10a (the main body 10A side) to the downstream side in the same manner as the mounting member 40 described above. Needless to say, it is good.

  In the pipe structures of the above two embodiments, the weir 3 for temporarily storing in the pipe is provided at the end of the drain pipe 2 via the mounting member 4. For example, as shown in FIG. When the weir 31 is used, it can be provided directly at the end of the drain pipe 2.

A weir 31 shown in FIG. 12 is a cylindrical body into which the drain pipe 2 is fitted, and a semicircular dam body 31a for closing the lower half of the opening of the cylindrical body is formed at one end thereof. The main body 31a temporarily stores rainwater in the pipe. The same hole 3a as the above-mentioned weir 3 is perforated in the lower part of the weir body 31a, and the rainwater temporarily stored by the weir 31 is gradually discharged to the rainwater basin 1.
Since the weir 31 used in this embodiment may be pushed by the flow of rainwater and come off the drain pipe 2, holes are drilled in the upper portions of the weir 31 and the drain pipe 2 as shown in FIG. The bolt 13a and the nut 13b are attached so as not to be detached. Further, similarly to the mounting member 40 described above, the dam body 31a of the dam 31 may be shifted to the downstream side. (Not shown)

When the above weir 31 is used, it takes more time to remove it from the drainage pipe 2 than the above-mentioned weir 3, so maintenance is somewhat inferior, but since it is easy to attach to the drainage pipe 2, it is easy to install. Has the advantage of being superior.
The weir 31 is preferably provided by the bolt 13a and the nut 13b as described above without using an adhesive so that the weir 31 can be removed during maintenance. In addition, a method in which a locking portion and a locked portion are provided and fixed to the end portions of the weir 31 and the drain pipe 2 can be considered.

  In addition to the above, the end of the drain pipe 2 connected to the inflow port 1a of the rainwater tank 1 or the inflow port 1a of the rainwater tank 1 is used as a weir for blocking rainwater and temporarily storing the rainwater in the pipe. Various embodiments provided in the section are conceivable. For example, a method of providing the weir 3 using a rainwater trough in which the weir 3 is integrally formed at the inlet 1a of the rainwater trough 1 or a drain pipe in which the weir 3 is integrally formed at the end of the drain pipe 2 is also conceivable. However, as in the above-described embodiment, it is preferable to form the weir 3 separately from the rainwater tank 1 or the drain pipe 2 and to provide the weir 3 later because the workability is excellent and the cost can be reduced.

Furthermore, in the pipe structure of the present invention, the weir 3 is provided at the end of the drain pipe 2 as described above, and a plurality of permeation holes are drilled in the side surface of the rain main body 1A of the rain water tank 1 to permeate the rain water tank 1. When a drainage pipe 2 is perforated with a plurality of permeation holes and the drainage pipe 2 is used as a permeation pipe, rainwater is gradually discharged from other than the holes 3a perforated in the weir 3, so that the weir 3 (weir 31 In this case, it is possible to increase the amount of storage in the piping by increasing the height of the weir body 31a), and the effect of suppressing rainwater outflow can be further increased. In this way, rainwater that falls on the ground surface penetrates from the ground surface into the ground, and penetrates from the perforations and holes drilled in the permeation pipes into the permeation and permeation pipes. can do. When the drain pipe 2 is an osmotic pipe, the flow gradient may be eliminated, and the construction height does not need to be gradually lowered and may be the same height.
When the height of the weir 3 (the weir body 31a in the case of the weir 31) is increased, the weir 3 is shifted to the downstream side like the weir 3 attached to the attachment member 40 described above to open the opening portion 12. It is preferable not to reduce the opening cross-sectional area of the drain pipe 2.
Further, in this embodiment, the rainwater tank 1 located on the most downstream side in the residential land is selected, but the rainwater tank 1 provided with the weir 3 is arbitrarily selected in consideration of the amount to be stored and the ease of maintenance. do it.

As is clear from the above description, the rainwater drainage pipe structure of the present invention falls into the residential land by providing the weir 3 at the end of the drainage pipe 2 connected to the rainwater trough 1 located on the most downstream side. Rainwater can be temporarily stored in the piping (rainwater basin 1 and drainage pipe 2 located upstream from weir 3). As described above, after temporarily storing rainwater in the pipe, it is gradually caused to flow out from the hole 3a drilled in the weir 3 into the rainwater drain main 9 or a side gutter (not shown) of the road, which has become a serious problem recently. It will be possible to mitigate urban floods.
On the other hand, at the time of construction, since the weir 3 is simply provided through the attachment member 4 attached to the end of the drain pipe 2 connected to the rain water tank 1, the rain water tank can be obtained without troublesome civil engineering work such as excavating the ground. Since it can be easily constructed simply by removing one lid 1B and can be easily retrofitted to an existing rainwater drainage pipe, it is possible to reduce costs and shorten the construction period.

The schematic perspective view which shows the rainwater drainage piping structure which concerns on one Embodiment of this invention, FIG. 2 is a schematic sectional drawing which shows the principal part of the piping structure. It is a schematic sectional drawing which shows the principal part of the same piping structure. FIG. 3 is a partially enlarged view of FIG. 2. The weir used for the same piping structure is shown, Comprising: (a) is a front view, (b) is a top view. It is a fragmentary sectional view which shows the state which attached the attachment member used for the same piping structure to the drain pipe connected to the rain water tank. It is a front view which shows the state which attached the weir to the same attachment member. It is a fragmentary sectional view which shows the state which attached the attachment member used for the rainwater drainage piping structure which concerns on other embodiment of this invention to the drainage pipe. It is a partially broken figure which shows the state which attached the attachment member to the public rainwater trough used for the rainwater drainage piping structure which concerns on other embodiment of this invention. The weir used for the same piping structure is shown, Comprising: (a) is a front view, (b) is a top view. It is a fragmentary sectional view which shows the state which attached the attachment member used for the same piping structure to the rainwater tank to which the drain pipe was connected. It is a front view which shows the state which attached the weir to the same attachment member. It is a perspective view which shows the weir used for the rainwater drainage piping structure which concerns on other embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which attached the weir used for the same piping structure to the drain pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rainwater basin 10 Public rainwater basin 1A, 10A 桝 Body 1B Lid 1a, 10a Inlet 11a Inlet 1b, 10b Outlet 1c Infiltration hole 1d Seal packing 2 Drain pipe 3, 30, 31 Weir 31a Weir body 3a Hole 3b Projection strip 4, 40, 41 Mounting member 4a Groove 4b Semi-annular packing 4c Saddle 4d Engagement protrusion 5 Eaves 6 Solid 7 House 7a Roof 8 Joint 9 Rainwater drainage main 12 Open part 13a Bolt 13b Nut

Claims (5)

  A rainwater drainage pipe structure in which a rainwater tank and a rainwater tank are connected by a drainage pipe, and the end of the drainage pipe connected to the inlet of the rainwater tank located on the downstream side or the inlet of the rainwater tank located on the downstream side A rainwater drainage pipe structure characterized in that a weir for temporarily storing rainwater flowing into the pipe is provided and a hole for gradually discharging the rainwater temporarily stored in the weir is perforated.   Make sure that the bottom of the hole is at the same height as the bottom of the rainwater inflow pipe located on the downstream side or the bottom of the drainage pipe connected to the inflow of the rainwater tank located on the downstream side. The rainwater drain piping structure according to claim 1, wherein   The rainwater drainage pipe structure according to claim 1 or 2, wherein the weir is detachably provided.   The weir is detachably provided via an attachment member attached to the end of the drainage pipe connected to the inflow port of the rainwater tank located on the downstream side or the inflow port of the rainwater tank located on the downstream side. The rainwater drainage pipe structure according to any one of claims 1 to 3, wherein the rainwater drainage pipe structure is provided.   The rainwater drainage pipe structure according to any one of claims 1 to 4, wherein the weir is provided in a watertight manner.

Images