JP5027028B2 - Rainwater drainage pipe structure - Google Patents

Description

  The present invention relates to a rainwater drainage pipe structure, and more particularly to a rainwater drainage pipe structure provided with a backflow prevention valve.

  For example, when it rains in a detached house or the like, rainwater is collected from the gutter to the inside of the house, and is discharged to a rainwater channel outside the house (for example, a gutter or a rainwater main). In addition, when a rainwater storage and penetration tank is installed in the house, the rainwater is once collected in the rainwater storage and penetration tank, and then from the rainwater storage and penetration tank or through the inside of the house to the rainwater flow path outside the house. Discharged.

By the way, when a large amount of rain falls in a short period of time, the amount of water in the rainwater flow path outside the home increases, and there is a possibility that rainwater flows backward from the rainwater flow path toward the inside of the house. Therefore, it has been proposed to install a backflow prevention valve in a pipe between the house and the rainwater flow path outside the house (see Patent Document 1).
JP-A-9-268608

  However, in the drainage pipe structure described in Patent Document 1, the backflow prevention valve is installed in a pipe connecting the basin and the rainwater main pipe in the house, and the entire pipe is buried in the ground. Yes. For this reason, it is difficult to perform maintenance work such as removing dust adhering to the check valve after the check valve has been installed in the pipe.

  The present invention has been made in view of the above points, and the object of the present invention is to prevent the backflow of rainwater from the rainwater flow path by the backflow prevention valve and to relatively easily perform the maintenance work of the backflow prevention valve. The purpose is to provide a rainwater drainage pipe structure.

  When the rainwater drainage pipe structure according to the present invention is buried in the ground and an inspection port opened to the ground is formed, it is connected to the predetermined rainwater flow path and buried in the ground. A conduit, and a backflow prevention valve disposed inside the trough so that at least a part thereof is located below the inspection port.

  According to the drainage pipe structure described above, the backflow prevention valve is arranged inside the tank, and the maintenance work of the backflow prevention valve can be performed through the inspection port. Therefore, after the drainage pipe structure is laid, the maintenance work for the backflow prevention valve can be performed relatively easily.

In the drainage pipe structure , at least a part of the sealing portion is formed on the upstream side of the backflow prevention valve inside the trough .

  Accordingly, it is possible to prevent intrusion of a strange odor or a pest upstream with the sealing portion together with the backflow prevention valve.

  The drainage pipe structure further includes an upstream trough having an approximately bottomed cylindrical main body formed with an inflow and an outflow and extending in the vertical direction, and the backflow prevention valve is disposed upstream An end is connected to the outlet of the main body, and is connected to the elbow pipe through a pipe joint or an elbow pipe curved from the bottom to the side as it goes upstream. A check cylinder that is formed and extends in the vertical direction in which the inspection port is formed, and the backflow prevention valve is disposed below the inspection cylinder and extends from the bottom of the main body to the bottom of the elbow pipe. The sealing part may be formed.

  This makes it possible to easily dispose the drainage pipe structure by integrally handling the above-mentioned upstream basin (for example, by handling it as one basin).

  Alternatively, the drainage pipe structure further includes an elbow pipe that is connected to the outlet of the basin and is curved downward from the side toward the upstream side, and the backflow prevention valve is provided inside the elbow pipe. The sealing part may be formed in the interior of the trough by the upstream end of the elbow pipe being immersed in the inner water.

  As a result, it is possible to relatively easily form a rainwater drainage pipe structure that prevents backflow and facilitates maintenance work.

The backflow prevention valve has a substantially horizontal disk-shaped valve seat formed with a shaft hole extending in a vertical direction through which a shaft can be inserted, a circulation hole through which rainwater flows, and extends in a vertical direction inserted through the shaft hole. a shaft, are formed on the end portion of the upper of said shaft, and a valve body having a valve body of substantially horizontal disc-shaped large enough to cover the communication holes of the valve seat when viewed from above, in the valve seat It is preferable that a tapered surface that extends upward is formed around the circulation hole.
In addition, when another rainwater drainage pipe structure according to the present invention is buried in the ground and an inspection opening opened to the ground is formed, it connects the predetermined rainwater flow path to the ground. And a backflow prevention valve disposed inside the trough so that at least a part thereof is located below the inspection port, and the backflow prevention valve is vertically movable through which a shaft can be inserted. Formed in a substantially horizontal disk-shaped valve seat formed with a shaft hole extending in the direction and a circulation hole through which rainwater flows, a shaft extending in the vertical direction inserted through the shaft hole, and an upper end portion of the shaft And a valve body having a substantially horizontal disk-shaped valve body having a size covering the flow hole of the valve seat as viewed from above, and surrounding the flow hole in the valve seat toward the upper side. A taper surface is formed so as to expand.

  As a result, foreign matters such as sand and dust that tend to accumulate in the valve seat easily fall along the tapered surface. Therefore, the frequency of necessary maintenance work can be reduced.

  It is preferable that the backflow prevention valve is a part or all of the final waste that finally collects rainwater in the home in one place.

  As a result, even if there are a plurality of rainwater piping systems in the house, only one place is required to provide the backflow prevention valve. Therefore, maintenance work becomes easy.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing the backflow of the rainwater from a rainwater main pipe etc., the drainage pipe structure of the rainwater with which the maintenance work of a backflow prevention valve is comparatively easy is realizable.

<Embodiment 1>
《Rainwater drainage pipe structure》
As shown in FIG. 1, the backflow prevention valve 10 according to the first embodiment is provided inside a final basin 20 that is a part of a rainwater drainage pipe structure 100. The drainage pipe structure 100 includes a rainwater storage and permeation tank 101 and a final tank 20, and discharges rainwater in the house to a side groove 102 outside the house. Although illustration is omitted, a plurality of piping systems are provided in the house. Rainwater that has flowed through these piping systems merges and flows into the rainwater storage and penetration tank 101 or joins in the rainwater storage and penetration tank 101. The rainwater collected in the rainwater storage and penetration tank 101 is finally supplied to 20. That is, the rainwater in the house is finally collected at one place in the final 20.

  Here, the term “in-house” refers to, for example, a site such as a detached house or a store, and is a site owned by an individual, a corporation, another group, or the like. On the other hand, outside the house is a public site.

  The rainwater storage and penetration tank 101 is connected to a pipe 103 for introducing rainwater from a rain gutter in a house or the like (not shown). The rainwater storage and penetration tank 101 and the final basin 20 are connected via a pipe 104. The final cylinder 20 and the side groove 102 are connected via a pipe 105. With such a structure, the drainage pipe structure 100 discharges rainwater introduced from the pipe 103 to the side groove 102 outside the house through the rainwater storage and penetration tank 101, the pipe 104, the final tank 20, and the pipe 105. In FIG. 1, the code | symbol G represents the ground. The rainwater storage and permeation tank 101 and the final tank 20 are buried in the ground, and the entire drainage pipe structure 100 is buried in the ground.

  The drainage pipe structure 100 is not limited to the one that discharges rainwater collected in the house to the side groove 102 as in the present embodiment, but the rainwater main ( It may be one that is discharged (not shown).

《Let's do it》
As shown in FIG. 2 and FIG. 3, the final mass 20 is composed of a water collecting mass 21 and an auxiliary mass 22. As shown in FIG. 2, the water collecting basin 21 includes a bottomed cylindrical bottom portion 21a, a substantially cylindrical body portion 21b connected to the upper side of the bottom portion 21a, and a substantially cylindrical shape connected to the upper side of the body portion 21b. And a lid 21e that covers an inspection port 21d formed on the upper side of the upper portion 21c. A receiving port 21f to which the tube 104 is connected is formed on the side of the body portion 21b. An inflow port 21g for the body portion 21b is formed inside the receiving port 21f. An outlet 21h is formed at the side of the bottom 21a.

  The auxiliary trough 22 includes an elbow tube 22a curved upward from the side, a T-shaped cheese 22b connected to the upper end of the elbow tube 22a, and a substantially cylindrical inspection connected to the upper side of the cheese 22b. A cylinder 22c and a lid 22e that covers an inspection port 22d formed on the upper side of the inspection cylinder 22c are provided. The upstream end (that is, the lower end portion) of the elbow pipe 22 a is connected to the side portion of the bottom portion 21 a of the water collecting tank 21. In addition, although the elbow pipe 22a and the bottom part 21a of the water collecting basin 21 may be separate members, they may be the same member as in the present embodiment. That is, the elbow pipe 22a and the bottom 21a of the water collecting basin 21 may be integrally formed.

  As shown in FIG. 4, the lid 22e is a so-called lattice lid, and a plurality of holes 25 are formed in the lid 22e. Note that the lid 21e of the water collecting basin 21 has the same configuration as the lid 22e, and a plurality of holes 25 are also formed in the lid 21e (see FIG. 2). Such a hole 25 is useful in that it collects rainwater on the surface and releases the pressure. However, the hole 25 may not be formed in the lid 21e or the lid 22e. That is, the lid 21e or the lid 22e may be a sealed lid in which no hole is formed.

《Backflow prevention valve》
The backflow prevention valve 10 includes a substantially disc-shaped valve seat 11 and an umbrella-shaped valve body 12. The backflow prevention valve 10 is disposed inside the auxiliary cylinder 22 with the valve seat 11 being sandwiched between the outlet 24 of the elbow 22a and the receiving port 26 of the cheese 22b.

  As shown in FIGS. 5A and 5B, the valve seat 11 has an inner portion 11b and an outer peripheral portion 11a. The outer peripheral portion 11a is a portion sandwiched between the outlet 24 of the elbow tube 22a and the receiving port 26 of the cheese 22b, and is formed in a flat plate shape (see FIG. 5B). The inner portion 11b is formed with a shaft hole 11c through which a shaft can be inserted and a circulation hole 11d through which rainwater flows. In the present embodiment, four circulation holes 11d are formed. However, the shape and the number of the flow holes 11d are not limited to those of this embodiment. The inner portion 11b and the outer peripheral portion 11a may be integrated as in the present embodiment, but may be separate. For example, a convex part or a concave part can be formed on the outer peripheral part of the inner part 11b, a concave part or a convex part can be formed on the inner peripheral part of the outer peripheral part 11a, and the convex part and the concave part of the inner part 11b and the outer peripheral part 11a can be engaged. By doing so, the inner portion 11b and the outer peripheral portion 11a may be detachable. Thereby, it becomes possible to remove easily the other part of the backflow prevention valve 10 except the outer peripheral part 11a, and cleaning and inspection can be performed easily.

  As shown in FIGS. 6A and 6B, the valve body 12 includes a shaft 12a, a valve body 12b formed on the upper end side of the shaft 12a, and a stopper 12c provided on the lower end side of the shaft 12a. I have. The shaft 12a is slidably inserted into the shaft hole 11c of the valve seat 11, and the outer diameter of the shaft 12a is slightly smaller than the inner diameter of the shaft hole 11c. The valve body 12b is formed in a substantially disk shape having a size covering the flow hole 11d of the valve seat 11 when viewed from the axial direction, that is, in plan view. The upper surface of the valve body 12b is an inclined surface that is gently inclined from the center side toward the radially outer side. A protruding portion 12d that protrudes downward is formed on the outer peripheral side of the lower surface of the valve body 12b. A seal ring 12e is fitted into the protruding portion 12d. Specifically, a depression is formed on the circumference of the bottom surface of the protruding portion 12d, and a seal ring 12e is press-fitted into the depression. The stopper 12c is for preventing the valve body 12 from being detached from the valve seat 11 when the valve body 12 moves upward (see FIG. 7), and is formed in an annular shape larger than the shaft hole 11c.

<Operation of check valve>
As shown in FIG. 7, when rainwater flows from the water collecting tank 21 toward the auxiliary tank 22, the valve body 12 of the check valve 10 is pushed up by the rainwater flow, and the flow hole 11 d of the valve seat 11 is opened. Thereby, rainwater flows in the elbow pipe 22a from the lower side to the upper side. That is, rainwater flows through the auxiliary tank 22 from the upstream side toward the downstream side.

  On the other hand, when there is no rainwater flow in the auxiliary tank 22, the valve body 12 moves downward due to its own weight, and the flow hole 11d of the valve seat 11 is closed as shown in FIG. Further, when rainwater flows from the side groove 102 toward the final 20, that is, when rainwater flows backward from the downstream side toward the upstream side, the valve body 12 is placed on the valve seat 11, The flow hole 11d of the valve seat 11 is closed. Therefore, the backflow of rainwater is prevented.

《About the sealed part》
A virtual line W in FIG. 2 represents the water surface when rainwater is not flowing. In this way, even when rainwater is not circulating, a predetermined amount of water is collected at the bottom of the water collecting tank 21 and the auxiliary tank 22. As a result, a sealed portion S is formed from the bottom portion 21a of the water collecting basin 21 to the elbow pipe 22a of the auxiliary basin 22.

  The backflow prevention valve 10 not only prevents the backflow of rainwater, but also prevents intrusion of off-flavors, pests and the like from the downstream side to the upstream side. In the present embodiment, the sealed portion S is further formed in the final 20, and the sealed portion S also prevents intrusion of off-flavors, pests, and the like. That is, the invasion of off-flavors, pests, and the like is double prevented by the backflow prevention valve 10 and the sealing portion S.

<How to install the backflow prevention valve>
The backflow prevention valve 10 according to the present embodiment can be attached as follows. First, the valve body 12 is attached to the valve seat 11 in advance. That is, the backflow prevention valve 10 is assembled. Specifically, the shaft 12a of the valve body 12 is inserted into the shaft hole 11c of the valve seat 11, and a stopper 12c is attached to the tip of the shaft 12a.

  Next, the check valve 10 assembled in this way is attached to the inside of the receptacle 26 of the cheese 22b or the upper end of the outlet 24 of the elbow pipe 22a. In addition, although the fixing method of the backflow prevention valve 10 is not specifically limited, For example, it can fix using an adhesive agent etc. Further, at this stage, the backflow prevention valve 10 may be simply fitted into the receiving port 26 or placed on the upper end of the insertion port 24 without being fixed with an adhesive or the like.

  Next, the receiving port 26 of the cheese 22b is fitted into the insertion port 24 of the elbow tube 22a. As a result, the outer peripheral portion 11 a of the valve seat 11 of the check valve 10 is sandwiched between the receiving port 26 and the outlet 24, and the check valve 10 is fixed in the receiving port 26. Thereafter, the receiving port 26 of the cheese 22b and the insertion port 24 of the elbow tube 22a are bonded using an adhesive or the like. Since the backflow prevention valve 10 is interposed between the receiving port 26 and the differential port 24, the backflow prevention valve 10 is also fixed to the receiving port 26 and the differential port 24 at this time.

<< Effects of the Embodiment >>
As described above, according to the rainwater drainage pipe structure 100 according to this embodiment, the backflow prevention valve 10 is disposed inside the auxiliary tank 22 having the inspection port 25. Further, the backflow prevention valve 10 is disposed so that at least a part thereof is positioned below the inspection port 22d. Therefore, the maintenance work of the backflow prevention valve 10 such as removing dust on the valve seat 11 can be performed through the inspection port 22d. Therefore, after the drainage pipe structure 100 is laid, the maintenance work of the backflow prevention valve 10 can be performed relatively easily.

  The auxiliary masu 22 constitutes a part of the final mast 20 that finally collects rainwater in the house in one place. Therefore, according to this embodiment, the backflow prevention valve 10 can prevent backflow to all the piping systems in the house. According to this embodiment, since it is sufficient to provide the backflow prevention valve 10 at one place, maintenance work can be performed more easily than when the backflow prevention valves are provided at a plurality of places.

  Moreover, according to this embodiment, the sealing part S is formed ranging from the bottom part 21a of the water collecting basin 21 to the elbow pipe 22a of the auxiliary 22 part. In other words, at least a part of the sealed water portion S is formed on the upstream side of the backflow prevention valve 10 inside the auxiliary tank 22. For this reason, the sealing portion S together with the backflow prevention valve 10 can also prevent the intrusion of a strange odor, a pest or the like into the upstream side. In other words, it is possible to prevent double penetration of a strange odor or pests into the upstream side. Even if the sealed water in the sealed water portion S is depleted, the intrusion of a strange odor or a pest is blocked by the backflow prevention valve 10.

  Further, in this embodiment, the auxiliary basin 22 is connected to the water collecting basin 21, and the water basin 21 and the auxiliary basal 22 constitute a final basin 20 with a backflow prevention valve. The drainage pipe structure 100 can be easily laid by integrally handling the water collecting basin 21 and the auxiliary basin 22, that is, by connecting the final basin 20 as one part to the pipe 104 and the pipe 105. it can.

  In addition, according to the backflow prevention valve 10 which concerns on this embodiment, the valve seat 11 is a member separate from the cheese 22b and the elbow pipe 22a, and the outer peripheral part 11a of the valve seat 11 is the receiving port 26 and elbow of the cheese 22b. By being sandwiched between the outlet 24 of the tube 22a, the cheese 22b and the elbow tube 22a are disposed inside. Therefore, it is not necessary to integrally form the valve seat 11 according to the shape of the cheese 22b or the elbow pipe 22a, and the structure of the valve seat 11 can be simplified.

  In addition, according to the backflow prevention valve 10 according to the present embodiment, the valve body 12 is attached to the valve seat 11, and the valve seat 11 is interposed between the receiving port 26 and the inserting port 24, and is inserted into the receiving port 26. It can be easily fixed simply by inserting the mouth 24. Therefore, the installation work of the backflow prevention valve 10 can be easily performed.

  Moreover, according to the backflow prevention valve 10 which concerns on this embodiment, it can install easily in the connection part of the arbitrary tubular members which have a receiving port, and the arbitrary tubular members which have a difference port. If tubular members having matching pipe diameters (for example, 75 mm, 100 mm, etc.) are prepared, they can be easily installed regardless of the type of tubular member. Therefore, a highly versatile backflow prevention valve can be realized.

  Moreover, according to this embodiment, the seal ring 12e is provided in the surface facing the valve seat 11 of the valve main body 12b. Therefore, the adhesion of the valve body 12 to the valve seat 11 can be improved, and the backflow prevention function can be further improved. In this embodiment, the seal ring 12e is provided on the surface of the valve body 12b facing the valve seat 11, but the seal ring 12e may be provided on the surface of the valve seat 11 facing the valve body 12b. Good. In this case, the same effect can be obtained.

<Modification>
As shown in FIG. 5B, in the check valve 10 according to the above embodiment, a vertical surface 11 f extending vertically is formed around the flow hole 11 d of the valve seat 11. However, as shown in FIG. 9, a tapered surface 11 g that spreads upward may be formed around the circulation hole 11 d of the valve seat 11.

  As described above, by forming the tapered surface 11g around the circulation hole 11d, foreign matters such as sand and dust attached to the circumference of the circulation hole 11d of the valve seat 11 are likely to fall naturally. Therefore, it is difficult for foreign matter to collect around the circulation hole 11 d of the valve seat 11, and it is possible to suppress foreign matter from being caught between the valve body 12 and the valve seat 11. Therefore, the opening / closing operation of the valve body 12 is stabilized. Moreover, the flow hole 11d can be closed more reliably, and a more stable backflow prevention effect can be obtained.

  In particular, in the above embodiment, the inspection port 22d is formed above the check valve 10. Although the inspection port 22d is covered with a lid 22e, a hole 25 is formed in the lid 22e. Therefore, compared to the case where the hole 25 is not formed in the lid 22e, the ground sand, dust, and the like can easily enter the inside of the support 22. Therefore, the above-mentioned effect becomes more useful.

  In the above embodiment, the inspection cylinder 22c is connected to the elbow pipe 22a via the cheese 22b which is a kind of pipe joint. However, the inspection cylinder 22c may be formed integrally with the elbow pipe 22a. Moreover, you may make it form the discharge port which discharges rainwater from the auxiliary support 22 in the inspection cylinder 22c.

<Embodiment 2>
As shown in FIG. 10, the backflow prevention valve 10 according to the second embodiment is provided inside the pipe joint 40. The pipe joint 40 is connected to an outlet 51 of the concrete mass 50 and is disposed inside the concrete mass 50. A pipe 104b for introducing rainwater is connected to the inlet 52 of the concrete mass 50. An inspection port 55 is formed on the upper side of the concrete mass 50. A pipe 105 is connected to the pipe joint 40 for discharging rainwater from the concrete mass 50 toward a side groove (not shown in FIG. 10; see reference numeral 102 in FIG. 1).

  As shown in FIG. 11, the pipe joint 40 includes an elbow pipe 41, a cylindrical pipe 44, and the backflow prevention valve 10. An elbow 42 is formed at one end of the elbow 41 and a receiving port 43 is formed at the other end. A tube 105 is fitted into the insertion opening 42 (see FIG. 10). Note that a receiving port may be formed at one end of the elbow pipe 41 instead of the differential port 42. A tube 44 is fitted into the receiving port 43. In the present embodiment, the length of the tube 44 is substantially equal to the length of the receiving port 43 (strictly, it is equal to the length obtained by adding the depth dimension of the receiving port 43 and the thickness of the valve seat 11). It does not protrude from the receiving port 43. However, a part of the tube 44 may protrude from the receiving port 43. In the present embodiment, the tube 44 is fitted into the receiving port 43 and plays a role as a so-called outlet. Of course, it is possible to fit a tube having a gap into the receiving port 43 instead of the tube 44.

  The configuration of the check valve 10 is the same as that of the first embodiment. In the present embodiment, the valve seat 11 of the check valve 10 is sandwiched between the receiving port 43 and the upper end of the pipe 44.

  The symbol W in FIG. 10 represents the water surface in the concrete mass 50 when rainwater is not flowing. Thus, even when rainwater is not circulating, a predetermined amount of water is accumulated in the concrete mass 50, and the lower end portion of the pipe joint 40 is immersed in the water. As a result, a sealed portion S is formed from the bottom of the concrete mass 50 to the lower end of the pipe joint 40.

  As in the first embodiment, the backflow prevention valve 10 not only prevents the backflow of rainwater but also prevents intrusion of off-flavors, pests and the like from the downstream side to the upstream side. Also in this embodiment, invasion of off-flavors, pests, and the like is double prevented by the backflow prevention valve 10 and the sealing portion S.

  The pipe joint 40 is assembled by fitting the pipe 44 into the receiving port 43 in a state where the backflow prevention valve 10 is disposed in the receiving port 43 of the elbow pipe 41. As in the first embodiment, the backflow prevention valve 10 is also fixed in the receiving port 43 by adhering the tube 44 and the receiving port 43 as the outlet.

  According to the present embodiment, the backflow prevention valve 10 is disposed below the inspection port 55 via the elbow pipe 41. That is, the backflow prevention valve 10 is arranged inside the elbow pipe 41, but at least a part of the elbow pipe 41 is arranged below the inspection port 55 of the concrete slab 50. Therefore, the backflow prevention valve 10 in the elbow pipe 41 can be maintained through the inspection port 55. Therefore, also in the present embodiment, after the drainage pipe structure 100 is laid, the maintenance work for the check valve 10 can be performed relatively easily.

  Also in the present embodiment, the lower end portion, that is, the upstream end portion of the elbow pipe 41 is immersed in rainwater in the concrete mass 50, so that the sealed portion S is formed inside the concrete mass 50. Therefore, also in this embodiment, invasion of the upstream side of off-flavors, pests, and the like can be prevented by the backflow prevention valve 10 and the sealing portion S, and the intrusion of off-flavors, pests, etc. can be prevented double. it can.

  According to this embodiment, the pipe joint 40 having a backflow prevention function can be realized. Also in the present embodiment, the valve seat 11 is disposed inside the elbow pipe 41 in a state of being sandwiched between the receiving port 43 of the elbow pipe 41 and the pipe 44 as the outlet, The valve seat 11 is not integral with the elbow pipe 41. Therefore, it is not necessary to form a valve seat on the elbow pipe 41, and a pipe joint having a backflow prevention function can be obtained with a relatively simple structure. In addition, the same effects as those of the first embodiment can be obtained.

  As in the first embodiment, in the present embodiment, a tapered surface that extends upward may be formed around the flow hole 11d of the valve seat 11.

  As described above, according to the present invention, the drainage pipe structure of rainwater is useful.

1 is a configuration diagram of a rainwater drain pipe structure according to Embodiment 1. FIG. FIG. It is a final top view. It is a top view of a lid | cover. (A) is a top view of a valve seat, (b) is the Vb-Vb sectional view taken on the line of (a). (A) is a side view of a valve body, (b) is a back view of a valve body. It is a longitudinal cross-sectional view of the auxiliary | assistant apparatus in the state which the valve body of the backflow prevention valve opened. It is a longitudinal cross-sectional view of the auxiliary | assistant apparatus in the state which the valve body of the backflow prevention valve closed. It is sectional drawing of the valve seat which concerns on a modification. It is a block diagram of the drainage pipe structure of the rain water which concerns on Embodiment 2. FIG. It is sectional drawing of the pipe joint provided with the backflow prevention valve.

Explanation of symbols

10 Backflow prevention valve 11 Valve seat 11a Outer peripheral part 11b Inner part 11c Shaft hole 11d Flow hole 11g Taper surface 12 Valve body 12a Shaft 12b Valve body 20 Final 21 Collect water (upstream side)
22 We will assist you
22a Elbow pipe 22b Cheese (pipe joint)
22c Inspection cylinder 22d Inspection port 41 Elbow pipe 100 Rainwater drainage pipe structure 102 Gutter (rainwater flow path)
105 pipe (pipe)
S Sealing part

Claims (6)

When an inspection port that is buried in the ground and opens to the ground is formed,
The pipe connected to the predetermined rainwater flow path and buried in the ground,
A backflow prevention valve disposed inside the mast so that at least a part is located below the inspection port ,
A rainwater drainage pipe structure in which at least a part of a sealed water part is formed on the upstream side of the backflow prevention valve inside the basin. An inlet and an outlet are formed, and further includes an upstream trough having a substantially bottomed cylindrical main body extending in the vertical direction;
The elbow pipe in which the upstream end is connected to the outlet of the main body and is curved from the bottom to the side as it goes upstream, and the elbow pipe through a pipe joint. Or an inspection cylinder that is formed integrally with the elbow pipe and that extends in the up-down direction, in which the inspection port is formed,
The backflow prevention valve is disposed below the inspection cylinder,
The rainwater drainage pipe structure according to claim 1 , wherein the sealed water portion is formed from a bottom portion of the main body to a bottom portion of the elbow pipe. An elbow pipe connected to the outlet and further curved downward from the side as it goes upstream;
The backflow prevention valve is disposed inside the elbow pipe,
By the upstream end of the elbow tube is immersed in water in the masu, wherein the water sealing portion inside the squares are formed, drain line structure rainwater according to claim 1. The backflow prevention valve is
A substantially horizontal disk-shaped valve seat formed with a shaft hole extending in the vertical direction through which the shaft can be inserted, and a circulation hole for circulating rainwater;
A shaft extending vertically to be inserted into the shaft hole, is formed at an end portion of an upper side of the shaft, and a valve body size substantially horizontal disc shape as viewed from above to cover the communication holes of the valve seat A valve body,
The drainage pipe structure of rainwater according to any one of claims 1 to 3 , wherein a tapered surface is formed around the flow hole in the valve seat so as to spread upward. When an inspection port that is buried in the ground and opens to the ground is formed,
  The pipe connected to the predetermined rainwater flow path and buried in the ground,
  A backflow prevention valve disposed inside the mast so that at least a part is located below the inspection port,
  The backflow prevention valve is
    A substantially horizontal disk-shaped valve seat formed with a shaft hole extending in the vertical direction through which the shaft can be inserted, and a circulation hole for circulating rainwater;
    A vertically extending shaft inserted into the shaft hole, and a substantially horizontal disk-shaped valve body formed at an upper end portion of the shaft and covering the flow hole of the valve seat as viewed from above. A valve body,
  A rainwater drainage pipe structure in which a tapered surface is formed around the flow hole in the valve seat so as to spread upward.   The drainage conduit for rainwater according to any one of claims 1 to 5, wherein the backflow prevention valve is disposed at a part or all of the final sump that finally collects rainwater in the house in one place. Construction.

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