Pit member for piping and drainage piping system including pit member for piping

Abstract

To provide a piping pit member and a drainage piping system capable of obtaining excellent drainage performance in a vertical pipe by improving inflow performance and drainage performance of rainwater to the vertical pipe.SOLUTION: According to an aspect of the present invention, there is provided a piping pit member connected to an upper portion of a vertical pipe, the piping pit member including a pipe main body portion disposed with a central axis thereof directed vertically, a horizontal pipe connecting portion formed on a side surface of the pipe main body portion and connected to a horizontal pipe, and a vertical pipe connecting portion formed on a lower portion of the pipe main body portion and connected to the vertical pipe, wherein a bottom plate for accommodating a member is provided inside the pipe main body portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a piping manhole member and a drainage piping system equipped with the piping manhole member. [Background technology]

[0002] In recent years, with the increasing frequency of heavy rainfall, there has been a trend toward larger rainwater pipes in order to improve the efficiency of draining rainwater from buildings. For example, in the drainage piping system for the rooftop floor of a building shown in Fig. 21, a frame-shaped roof drain 102 is installed along the part where a spandrel wall 101 is erected at the corner of the building rooftop floor 100. A horizontal pipe 103 connected to this roof drain 102 is installed so as to penetrate horizontally through the spandrel wall 101, and a drainage vertical pipe 106 is connected to the outer end of the horizontal pipe 103 via an elbow pipe 105 (see, for example, Non-Patent Document 1).

[0003] In a drainage piping system for the rooftop of a building, as shown in Figure 22, a drainage piping system is known in which a tee joint 107 is provided at the connection between a horizontal pipe 103 and a vertical pipe 106 instead of an elbow pipe 105. A removable cover plate 108 is provided on the ceiling of the tee joint 107. Alternatively, as shown in Figure 23, a drainage piping system is known in which a drainage manhole 109 is provided at the connection between a horizontal pipe 103 and a vertical pipe 106 instead of an elbow pipe 105. A removable cover plate 110 is provided on the ceiling of the drainage manhole 109. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Kaneso Co., Ltd. "Product Information: Cast Iron Roof Drain, Waterproofing Layer Width 100mm, Horizontal Pull, Drive-in Type," [online], [Retrieved August 5, 2020], Internet (URL http: / / www.kaneso.co.jp / seihin / WHXA.htm) Summary of the Invention [Problem to be solved by the invention]

[0005] In the drainage piping system shown in FIG. 21, rainwater on the roof is introduced into a horizontal pipe 103 via a roof drain 102, and then flows into a vertical pipe 106 via an elbow pipe 105, where it is drained. In a typical drainage piping system, the horizontal pipe 103 and the vertical pipe 106 are designed to have the same diameter, but in consideration of countermeasures against recent sudden heavy rains, there is a trend to make both the horizontal pipe 103 and the vertical pipe 106 larger in diameter in order to improve drainage capacity.

[0006] However, increasing the diameter of standpipes to protect against heavy rainfall increases the weight of the pipes in buildings with many floors, posing the problem of requiring a stronger support structure to withstand the weight of the pipes and wind force. Various other effects are also anticipated, such as an increase in the number of pipe support points using support fittings, the need for stronger support fittings, and in some cases, a need to reconsider the strength of the building structure. Furthermore, there are concerns that this will have various effects on the design and construction of buildings, such as the need to secure storage space for large-diameter standpipes, the need for larger heavy transport equipment, and the need for more labor. In the above-mentioned drainage piping system, if the pipe joints connecting the horizontal pipes and vertical pipes are individually designed to protect against heavy rain, dedicated parts will be required, which will increase the equipment costs.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a low-cost piping manhole member that can improve the inflow and drainage of rainwater into a standpipe. Another aim of the present invention is to provide a piping manhole member that does not increase the diameter of the standpipe even when the diameter of the horizontal pipe is increased. A further aim of the present invention is to provide a drainage piping system equipped with a piping manhole member. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following aspects. "1" The piping manhole member of this embodiment is a piping manhole member connected to the top of a vertical pipe, and has a pipe main body portion arranged with its central axis facing up and down, a horizontal pipe connection portion formed on the side of the pipe main body portion and connected to a horizontal pipe, and a vertical pipe connection portion formed on the bottom of the pipe main body portion and to which the vertical pipe is connected, and is configured so that a bottom plate for storing components is provided inside the pipe main body portion.

[0009] The vertical pipe and horizontal pipe can be connected via a piping box member. By providing a bottom plate for storing components within the box member, it becomes possible to use the bottom plate to install various components. If the box member has a horizontal pipe connection part and a vertical pipe connection part on the pipe body, the structure is simple and existing box members can be widely applied, which contributes to reducing equipment costs. If the member provided on the bottom plate is a siphon activation member, it can promote the occurrence of the siphon phenomenon, contributing to improving the drainage capacity of the standpipe.

[0010] [2] In the piping box member according to this embodiment, a configuration can be adopted in which the inner diameter of the vertical pipe connecting portion is smaller than the inner diameter of the horizontal pipe connecting portion.

[0011] Even if the diameter of the horizontal pipe is increased to deal with sudden heavy rain, the inner diameter of the standpipe connection is smaller than that of the horizontal pipe connection, so a standpipe with a smaller inner diameter can be connected. Even if the diameter of the horizontal pipe is increased and the amount of rainwater flowing from the horizontal pipe into the standpipe increases, gravity acts on the rainwater flowing in the standpipe, so the rainwater is discharged faster than the rainwater flowing in the horizontal pipe, so there is no problem with drainage capacity. Even if the diameter of the horizontal pipes is increased to counteract sudden heavy rain, the diameter of the vertical pipes can be reduced, which eliminates the need to increase the strength of the metal fittings that support the vertical pipes and reduces the number of supporting metal fittings required. Furthermore, by reducing the diameter of the vertical pipes, the load on the building structure can be reduced. Furthermore, since large diameter vertical pipes are no longer required, the storage space for large diameter vertical pipes can be reduced, contributing to the miniaturization of heavy transport equipment, and providing a structure that does not impose a burden on the design and construction of buildings.

[0012] [3] In the piping box member according to this embodiment, a configuration can be adopted in which a siphon activation member is attached to the bottom plate of the pipe body.

[0013] If a siphon activation member is attached to the bottom plate, the siphon effect can be utilized to improve the drainage capacity of the standpipe. Therefore, even if a large amount of wastewater flows into the main pipe from the horizontal pipe, it can be reliably drained through the standpipe.

[0014] [4] In the piping box member according to this embodiment, an opening may be formed in the upper part of the pipe body, and a lid member that opens and closes the opening may be removably attached.

[0015] If the opening of the pipe main body can be freely opened and closed with a lid member, if foreign matter accumulates inside the pipe main body or becomes clogged with foreign matter, the lid member can be removed to clean the inside of the piping manhole member, thereby providing a piping manhole member that is easy to maintain.

[0016] "5" The drainage piping system of this embodiment is characterized by comprising a piping manhole member described in any one of "1" to "4", a horizontal pipe connected to the horizontal pipe connection portion of the piping manhole member, and a vertical pipe connected to the vertical pipe connection portion of the piping manhole member.

[0017] "6" The drainage piping system of this embodiment is a drainage piping system comprising a roof drain installed on the roof floor of a building, a horizontal pipe connected to the roof drain and passing through the waist wall of the roof floor of the building, a piping manhole member connected to the outer end of the horizontal pipe, and a vertical pipe connected to the lower part of the piping manhole member, characterized in that the piping manhole member is a piping manhole member described in any of "1" to "4".

[0018] This drainage piping system can provide a configuration in which a vertical pipe and a horizontal pipe are connected via a piping manhole. By providing a bottom plate for storing components within the piping manhole, it becomes possible to use the bottom plate to install various components. If the piping manhole has a horizontal pipe connection part and a vertical pipe connection part in the pipe body, the configuration is simple and existing manhole components can be widely applied, contributing to reducing equipment costs. If the member provided on the bottom plate is a siphon activation member, it can promote the occurrence of the siphon phenomenon, contributing to improving the drainage capacity of the standpipe.

[0019] If the diameter of the horizontal pipe is increased to deal with sudden heavy rains, and the inner diameter of the standpipe connection is made smaller than the inner diameter of the horizontal pipe connection, a smaller diameter standpipe can be connected. Even if the diameter of the horizontal pipe is increased and the amount of rainwater flowing from the horizontal pipe into the standpipe increases, gravity acts on the rainwater flowing in the standpipe, causing it to be discharged faster than the rainwater flowing in the horizontal pipe, so there will be no problem with the drainage capacity of the drainage piping system. By increasing the diameter of the horizontal pipes and reducing the diameter of the vertical pipes, it is possible to provide a drainage piping system that eliminates the need to increase the strength of the metal fittings that support the vertical pipes more than necessary and also reduces the number of supporting metal fittings required. [Effects of the Invention]

[0020] The piping manhole of the present invention allows a vertical pipe and a horizontal pipe to be connected via the piping manhole. By providing a bottom plate for storing components within the piping manhole, it becomes possible to use the bottom plate to install various components. A piping manhole with a horizontal pipe connection portion and a vertical pipe connection portion on the pipe body has a simple configuration and can be widely applied to existing manhole components, contributing to reducing equipment costs. If the member provided on the bottom plate is a siphon activation member, it can promote the occurrence of the siphon phenomenon, contributing to improving the drainage capacity of the standpipe. [Brief explanation of the drawings]

[0021] [Figure 1]FIG. 1 is a partial cross-sectional view showing an example of a drainage piping system in which a piping box member according to the first embodiment of the present invention is applied to the connection between a horizontal pipe installed on the rooftop floor of a building and a vertical pipe arranged along the exterior wall. [Figure 2] FIG. 2 is a cross-sectional view of the piping box member according to the first embodiment. [Figure 3] FIG. 4 is a cross-sectional view of a piping box member according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a cross-sectional view of a piping box member according to a third embodiment of the present invention. [Figure 5] FIG. 10 is a cross-sectional view of a piping box member according to a fourth embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view of a piping box member according to a fifth embodiment of the present invention. [Figure 7] FIG. 11 is a plan view of the piping box member of the fifth embodiment. [Figure 8] FIG. 10 is a plan view showing a modified example in which the peripheral wall of the piping box member is rounded. [Figure 9] FIG. 10 is a plan view showing a modified example in which the peripheral wall of the piping box member is partly square and partly rounded. [Figure 10] FIG. 10 is a cross-sectional view of a piping box member according to a sixth embodiment of the present invention. [Figure 11] FIG. 13 is a cross-sectional view of a piping box member according to a seventh embodiment of the present invention. [Figure 12] 13 is a partial cross-sectional view showing a connection structure between a piping box member and a horizontal pipe and a vertical pipe according to an eighth embodiment of the present invention. FIG. [Figure 13] FIG. 13 is a side view of the connection structure shown in FIG. [Figure 14] FIG. 13 is a cross-sectional view of a piping box member according to a ninth embodiment of the present invention. [Figure 15] FIG. 22 is a cross-sectional view of a piping box member according to a tenth embodiment of the present invention. [Figure 16] FIG. 22 is a cross-sectional view of a piping box member according to an eleventh embodiment of the present invention. [Figure 17] FIG. 1 is a perspective view showing an outline of a verification test conducted to verify the influence depending on the length of the horizontal pipe. [Figure 18]FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 0.3 m. [Figure 19] FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 1.0 m. [Figure 20] 14 is a graph showing test results obtained by the verification test device shown in FIGS. 12 and 13. [Figure 21] FIG. 1 is a configuration diagram showing a first conventional example of a drainage piping system. [Figure 22] FIG. 10 is a configuration diagram showing a second conventional example of a drainage piping system. [Figure 23] FIG. 10 is a configuration diagram showing a third conventional example of a drainage piping system. DETAILED DESCRIPTION OF THE INVENTION

[0022] An example of a drainage piping system including a piping box member according to a first embodiment of the present invention will be described below with reference to FIGS. The drainage piping system including the piping box member according to this embodiment is applied to drainage of buildings such as buildings and apartment buildings. In the first embodiment shown in Fig. 1, a piping manhole member 3 is provided on the outside of the joint between the rooftop floor 1 of a building and a waist wall 2 erected at the corner of this rooftop floor 1. A frame-shaped roof drain 5 is provided inside the joint between the rooftop floor 1 and the waist wall 2, and the piping manhole member 3 is connected to the outer end of a horizontal pipe 6 that is connected to this roof drain 5 and passes horizontally through the waist wall 2, and a vertical pipe 7 is connected to the bottom of the piping manhole member 3. In the first embodiment, a drainage piping system S is configured including the roof drain 5, horizontal pipe 6, piping manhole member 3, and vertical pipe 7. The standpipe 7 extends downward along the outer wall 8 of the building and is connected to drainage equipment such as a catch basin or other drainage pipe (not shown) provided on the ground near the building.

[0023] The roof drain 5 has an L-shaped frame 12 consisting of a bottom plate 10 and a side plate 11, and a tubular member 13 for connecting piping is integrated into the frame 12. The tubular member 13 extends outward from the side plate 11 through a through-hole 11a formed on the bottom side of the side plate 11. The roof drain 5 is installed at the corner of the roof floor 1 by placing the bottom plate 10 at the corner of the roof floor 1, adhering the side plate 11 to the bottom of the waist wall 2, and inserting a tubular member 13 into a through hole 2a formed at the bottom of the waist wall 2. An L-shaped frame-shaped strainer 17 with multiple water passage holes is removably attached to the inside of the frame body 12 using bolts 18 and nuts 19, and the frame body 12 and strainer 17 form the roof drain 5.

[0024] By attaching the strainer 17 to the frame 12 with bolts 18 and nuts 19, the end of the waterproof sheet 15 on the roof floor 1 side is sandwiched and held down between the bottom plate 10 of the roof drain 5 and the bottom of the strainer 17. Similarly, by using the bolts described above, the end of the waterproof sheet 16 on the waist wall 2 side is sandwiched and held down between the side plate 11 and the top of the strainer 17. The roof drain 5 used in this embodiment is just one example, and the structure of the roof drain applied to the present invention may be any roof drain of a general structure, such as a general frame type or box type. For example, the roof drain 5 provided on a horizontal part rather than a corner part of the roof floor 1 may be connected to the horizontal pipe 6, and in this case, the tubular member 13 provided on the bottom plate 10 of the roof drain 5 opens in the vertical direction, so the roof drain 5 and the horizontal pipe 6 are connected via an elbow.

[0025] A horizontal through-hole 2a is formed in the waist wall 2 at a position where it meets the roof floor 1. A horizontal drainage pipe 6 is arranged in this through-hole 2a so that one end of the pipe protrudes slightly outside the through-hole 2a and the other end is connected to the tubular member 13 of the roof drain 5. The piping box member 3 connected to the horizontal pipe 6 has a pipe main body 22, a horizontal pipe connecting portion 23, and a vertical pipe connecting portion 24. The pipe main body 22 is installed close to the waist wall 2 with its central axis aligned vertically. The pipe main body 22 has a cylindrical shape, and a cylindrical horizontal pipe connecting portion 23 protrudes sideways from part of its side wall 22a. When installing the pipe main body 22, it is acceptable to install it with its central axis slightly tilted from the vertical.

[0026] The horizontal pipe connection part 23 is composed of a branch pipe protruding from the side of the pipe main body part 22, and has an opening of a size that allows the outer end of the horizontal pipe 6 to be inserted, and the outer end of the horizontal pipe 6 is inserted into this opening, and the horizontal pipe 6 is connected to the horizontal pipe connection part 23 by a joining means such as adhesive. The inner diameter of the horizontal pipe connection part 23 is set to an inner diameter that allows the horizontal pipe 6 to be inserted, as described above, and the inner diameter of the pipe main body part 22 is also formed to be approximately the same as the inner diameter of the horizontal pipe connection part 23. The horizontal pipe connection part 23 is formed on the bottom side of the pipe main body part 22. In the configuration shown in Figures 1 and 2, the height dimension of the pipe main body portion 22 is formed slightly larger than the outer diameter of the horizontal pipe connection portion 23, so that the uppermost end position of the horizontal pipe connection portion 23 is located below the upper end of the pipe main body portion 22, and the lowermost end position of the horizontal pipe connection portion 23 is located near the bottom of the pipe main body portion 22.

[0027] An enlarged cross-sectional view of the inside of the piping box member 3 is shown in FIG. As shown in Fig. 2, the piping box member 3 is installed with the central axis of the pipe main body 22 oriented vertically, but the bottom plate 22A is formed at a position slightly higher than the lower end of the pipe main body 22. In the configuration shown in Fig. 2, the bottom plate 22A is formed at approximately the same height as the lowest end position of the horizontal pipe connection portion 23. A through hole 22d for connecting to a vertical pipe is formed in the center of the bottom plate 22A. In the pipe main body 22, a cylindrical standpipe connecting portion 24 is formed below the bottom plate 22A.

[0028] A siphon activation member 25 is provided inside the piping manifold 3, and the bottom side of this siphon activation member 25 is connected to a ring-shaped connecting member 26 arranged on the underside of the bottom plate. The connecting member 26 has a flange portion 26B formed on the upper side of a connecting tubular portion 26A, and the outer diameter of the flange portion 26B is formed slightly smaller than the outer diameter of the bottom plate 22A of the pipe main body 22. In addition, an internal thread portion (not shown) is formed on the inner circumferential surface of the connecting tubular portion 26A.

[0029] Siphon activation member 25 has, for example, cover member 25A, a plurality of vertical ribs 25B formed on the underside of cover member 25A and extending downward, a flange portion 25C formed below vertical ribs 25B, and a connecting tube portion 25D extending below flange portion 25C. A plurality of gripping ribs 25E are formed on the upper surface of cover member 25A. Cover member 25A may be provided with through holes. The opening between the cover member 25A and the flange portion 25C is an inflow opening 25F for wastewater. A guide (not shown) is formed on the center side of the bottom surface of the cover member 25A to direct the wastewater flowing in from the inflow opening 25F downward. An external thread portion (not shown) that can be threaded into the internal thread portion of the connecting member 26 described above is formed on the outer circumferential surface of the connecting tube portion 25D.

[0030] In siphon activation member 25, connecting cylindrical portion 25D has an outer diameter that is slightly smaller than the inner diameter of through-hole 22d formed in bottom plate 22A of pipe main body 22. In pipe main body 22, connecting tubular portion 26 is disposed on the underside of bottom plate 22a, and siphon activation member 25 is attached to bottom plate 22A of pipe main body 22 by threading the external threads of connecting tubular portion 25D of siphon activation member 25 onto the internal threads of connecting tubular portion 26. In other words, siphon activation member 25 is fixed to bottom plate 22A by sandwiching bottom plate 22A between siphon activation member 25 and connecting tubular portion 25D. Note that while Figure 2 shows siphon activation member 25 and connecting tubular portion 26 in an unscrewed state and separated from bottom plate 22A, in this attached state siphon activation member 25 and connecting tubular portion 26 are integrated by being threaded together.

[0031] A flange portion 25C is formed on the outer periphery of the upper end opening of the connecting tubular portion 2D, and the upper end opening of the connecting tubular portion 2D serves as a drainage outlet. The size, height, and shape of each part of siphon activation member 25 are adjusted so that the area of ​​inflow opening 25F is larger than the area of ​​the upper end opening of connecting cylindrical portion 25D (the opening area of ​​the drop spout portion). In this embodiment, the area of ​​inflow opening 25F can be calculated by multiplying the circumferential length of circular cover member 25A by the height H from flange portion 25C to cover member 25A.

[0032] The inner diameter of connecting tube portion 25D for mounting cover member 25A is preferably 50 mm or more and 170 mm or less, and more preferably 70 mm or more and 170 mm or less. That is, by setting the opening outer diameter of the drop spout portion of the connecting tube portion to the lower limit of 50 mm or more, a large amount of wastewater generated by siphon activation member 25 can be smoothly discharged. Furthermore, by setting the upper limit of 170 mm or less, the storage space when housed in piping manhole member 3 becomes small, and it is possible to prevent piping manhole member 3 from becoming larger. The upper end of the upright pipe 7 is inserted into the connecting cylindrical portion 26A of the connecting member 26 and fixed by a joining means such as adhesive.

[0033] 1 and 2, the inner diameter of the connecting tube portions 25D, 26A is set to about half the inner diameter of the pipe main body portion 22. In addition, the inner diameter of the connecting tube portions 25D, 26A is formed to be about half the inner diameter of the horizontal pipe 6, so the inner diameter of the vertical pipe 7 is formed to be about half the inner diameter of the horizontal pipe 6. In this embodiment, the inner diameter of the standpipe 7 is set to about 1 / 2 the inner diameter of the horizontal pipe 6, but the inner diameter of the standpipe 7 may be set to about 1 / 2 to 1 / 1 the inner diameter of the horizontal pipe 6. That is, the inner diameter of the connecting cylindrical portions 25D, 26A may be set to about 1 / 2 to 1 / 1 of the inner diameter of the pipe main body 22. In any case, in this embodiment, the inner diameter of the connecting cylindrical portions 25D, 26A (≈ inner diameter of the standpipe 7) is set to be equal to or smaller than the inner diameter of the pipe main body 22 (≈ inner diameter of the horizontal pipe 6).

[0034] The piping manhole member 3 is formed by injection molding resins such as olefin resins such as PE (polyethylene), PP (polypropylene) or PB (polybutene), rigid polyvinyl chloride resin, ABS (acrylonitrile-butadiene-styrene copolymer resin), AES (acrylonitrile-ethylene-styrene copolymer resin), etc. Siphon activation member 25 is an injection-molded product made of synthetic resin, such as hard vinyl chloride resin, polycarbonate, ABS, AES, etc. The material of siphon activation member 25 is not limited to synthetic resin, and it may be made of metal, such as cast iron, stainless steel, or aluminum.

[0035] In the piping box member 3, an opening 22b is formed at the upper end of the pipe main body 22, and this opening 22b is closed by a detachable lid member 28. The lid member 28 is a cap-shaped member equipped with a top plate 28A and a connecting tube 28B. It is desirable that an air vent hole be formed in the lid member 28. Opening 22b may be provided on the side surface of the pipe main body, in which case cover member 28 is detachably fitted into the side opening of pipe main body 22. The opening provided on the side surface of the pipe main body makes it easier to screw the external thread portion of connecting tubular portion 25D of siphon activation member 25 into the internal thread portion of connecting tubular portion 26.

[0036] The drainage performance of the structure shown in Figure 1 will be explained below. When rainwater or the like flows along the waterproof sheet 15 and reaches the roof drain 15, it passes through the through holes 11a and flows into the horizontal pipe 6, and then flows into the inside of the pipe main body 22 via the horizontal pipe connection part 23 of the piping manhole member 3. The rainwater that flows into the pipe main body 22 changes its flow direction downward, passes through the siphon activation member 25, and travels down the vertical pipe 7 to be discharged into the drainage equipment side, such as a catch basin.

[0037] Meanwhile, in recent years, there has been a trend toward increasing the diameter of the horizontal pipe 6 to improve drainage capacity, due to measures against sudden heavy rains and other factors. In the structure of this embodiment, the inner diameter of the horizontal pipe 6 is equal to or smaller than the inner diameter of the standpipe 7. When rainwater flows into the standpipe 7, gravity acts on the rainwater flowing through the standpipe 7, so the rainwater flowing through the standpipe 7 is discharged more smoothly than the rainwater flowing through the horizontal pipe 6. Therefore, even if a large amount of rainwater flows into the standpipe 7 through the horizontal pipe 6, the rainwater flowing through the standpipe 7 flows faster, and sufficient drainage can be achieved through the standpipe 7 even with a small inner diameter. As an example, if the nominal diameter of the horizontal pipe 6 is 150 mm, the nominal diameter of the standpipe 7 can be 75 mm. The nominal diameter of the standpipe 7 may also be 100 mm.

[0038] In this embodiment, when a standpipe 7 with a smaller diameter than the horizontal pipe 6 is provided, the weight of the standpipe 7 can be reduced compared to a conventional structure in which a standpipe with the same outer diameter as the horizontal pipe 6 is provided. Because the weight of the standpipe 7 can be reduced, the number of metal fittings supporting the standpipe 7 can be reduced, and the strength of the supporting metal fittings can be reduced, thereby reducing excessive load on the building structure. In addition, when installing the standpipe 7, storage space can be reduced and the need for heavy transport equipment can be suppressed, which has the advantage of creating flexibility in the design and construction of the building.

[0039] Next, the operation of the siphon actuation member 25 will be described. When viewed from above, siphon activation member 25 blocks the opening of the downspout (the upper end opening of connecting tube portion 25D) with drainage water, and seals downspout 7 while keeping it full without sucking in air, even when a large amount of rainwater flows in through the inlet opening during heavy rain. As a result, a siphon phenomenon can occur downstream. In this way, siphon activation member 25 enables downspout 7 to exhibit its high drainage function. Therefore, even if a large amount of rainwater flows into the piping manhole member 3 from the horizontal pipe 6, good drainage capacity can be obtained.

[0040] Incidentally, in the explanation so far, an example has been described in which this embodiment is applied to a roof drain 5 installed on the rooftop floor 1 of a building, but the roof drain 5 can also be installed on a balcony floor, veranda floor, terrace floor, etc., so the structure of the previous embodiment of the present application can be applied to a roof drain installed on a balcony floor, veranda floor, terrace floor, etc.

[0041] 3 shows a piping manhole of a second embodiment according to the present invention, in which a piping manhole 30 of the second embodiment has a pipe main body 22, a horizontal pipe connecting portion 23, and a standpipe connecting portion 24, and is similar in configuration to the piping manhole 3 of the first embodiment. The piping manhole 30 of the second embodiment differs in that the inner diameter of the pipe main body 22 is larger than the inner diameter of the pipe main body 22 of the piping manhole 3 of the first embodiment. Another difference is that the inner diameter of the standpipe connecting portion 24 is larger than the inner diameter of the standpipe connecting portion 24 of the piping manhole 3 of the first embodiment. For example, in the piping manifold member 3 of the first embodiment, the horizontal pipe 6 has a nominal diameter of 150A and the vertical pipe 7 has a nominal diameter of 75A, but in the piping manifold member 30 of the second embodiment, the horizontal pipe 6 has a nominal diameter of 150A and the pipe main body 22 and the vertical pipe 7 have nominal diameters of 100A. In the piping manifold member 30 of the second embodiment, since the nominal diameter of the pipe main body 22 is larger, the upper side of the side wall 22a of the pipe main body 22 is formed thicker than in the first embodiment. Other configurations of the piping box member 30 of the second embodiment are the same as those of the piping box member 3 of the first embodiment.

[0042] Unlike the piping manifold member 30 of the second embodiment, the size of the vertical pipe 7 does not have to be half the size of the horizontal pipe 6. The piping manifold member 30 of the second embodiment can also achieve the same effects as the piping manifold member 3 described above.

[0043] FIG. 4 shows a third embodiment of a piping manhole according to the present invention. The third embodiment of the piping manhole 35 has a pipe main body 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has the same configuration as the piping manhole 3 of the first embodiment. In the piping manhole member 3 of the first embodiment, the horizontal pipe 6 has a nominal diameter of 150A and the vertical pipe 7 has a nominal diameter of 75A, but in the piping manhole member 30 of the third embodiment, the horizontal pipe 6 has a nominal diameter of 100A and the pipe main body 22 and the vertical pipe 7 have a nominal diameter of 75A. Other configurations of the piping box member 30 of the third embodiment are the same as those of the piping box member 3 of the first embodiment. The piping box member 35 of the third embodiment can also provide the same effects as the piping box member 3 described above.

[0044] FIG. 5 shows a fourth embodiment of a piping manhole according to the present invention. The fourth embodiment of the piping manhole 40 has a pipe main body 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has the same configuration as the piping manhole 3 of the first embodiment. In the piping manhole member 3 of the first embodiment, the horizontal pipe 6 has a nominal diameter of 150A and the vertical pipe 7 has a nominal diameter of 75A, but in the piping manhole member 40 of the fourth embodiment, the horizontal pipe 6 has a nominal diameter of 100A and the pipe main body 22 and the vertical pipe 7 have a nominal diameter of 100A. Other configurations of the piping box member 40 of the fourth embodiment are the same as those of the piping box member 3 of the first embodiment. As in the third embodiment, the horizontal pipe 6 and the vertical pipe 7 may have the same nominal diameter size. The piping box member 40 of the third embodiment can also provide the same effects as the piping box member 3 described above.

[0045] Figures 6 and 7 show a fifth embodiment of a piping manhole according to the present invention. The fifth embodiment of the piping manhole 45 has a pipe main body 46, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has the same configuration as the piping manhole 3 of the first embodiment. The piping measure member 45 of the fifth embodiment is characterized in that the shape of the pipe main body 46 in plan view is rectangular. There are no particular restrictions on the shape of the piping measure member in plan view, and it may be an elliptical pipe main body 47 as shown in Fig. 8, or may be one half of which is circular in plan view and the other half is rectangular in plan view as shown in Fig. 9. The square pipe body 46 shown in Figs. 6 and 7 can be installed closer to the adjacent wall surface, so that a stable support structure can be achieved when installed on a wall surface.

[0046] Figure 10 shows a sixth embodiment of a piping manhole member according to the present invention. The sixth embodiment of the piping manhole member 50 has a pipe main body 22, a horizontal pipe connection portion 51, and a vertical pipe connection portion 24, and has a configuration equivalent to that of the piping manhole member 3 of the first embodiment. The sixth embodiment of the piping box member 50 differs in that the horizontal pipe connection portion 51 does not have a branch pipe portion, but has a connection hole 52 formed on the side of the pipe main body portion 22 and a thick-walled portion 53 formed around its outer periphery. The horizontal pipe connecting portion 51 may be configured from a connecting hole 52 and a thick portion 53, as in the horizontal pipe connecting portion 51. The piping box member 50 of the sixth embodiment can also provide the same effects as the piping box member 3 described above.

[0047] Figure 11 shows a piping manhole member of the seventh embodiment according to the present invention. The piping manhole member 55 of the seventh embodiment has a pipe main body portion 22, a horizontal pipe connection portion 56, and a vertical pipe connection portion 24, and has a configuration equivalent to that of the piping manhole member 3 of the sixth embodiment. The seventh embodiment of the piping box member 50 differs in that the horizontal pipe connection portion 56 does not have a branch pipe portion, but consists of a connection hole 57 formed on the side surface of the center portion in the height direction of the pipe main body 22 and a thick portion 58 formed on the outer periphery thereof. An edge portion 57 is formed on the outer periphery of the connection hole. The horizontal pipe connecting portion 56 may be configured from the connecting hole 7 and the thick portion 58, and may be formed at the center of the pipe main body 22 in the height direction. In the structure shown in FIG. 11, the drainage water from the horizontal pipe 6 flows into the pipe main body 22 from a position higher than the bottom plate 22A or the siphon member 25. The piping box member 55 of the seventh embodiment can also provide the same effects as the piping box member 50 described above.

[0048] 12 shows a drainage piping system S2 equipped with a piping manhole member of an eighth embodiment according to the present invention, in which a piping manhole member 60 applied to the eighth embodiment has a pipe main body 22, a horizontal pipe connecting portion 23, and a vertical pipe connecting portion 24, which is the same as the piping manhole member 3 of the first embodiment. Also, the configuration in which a horizontal pipe 6 is connected to the horizontal pipe connecting portion 23 and a vertical pipe 7 is connected to the vertical pipe connecting portion 24 is the same. The piping box member 60 of the eighth embodiment is characterized in that the standpipe 7 is connected to the standpipe connection portion 24 via an S-shaped elbow pipe 61. By arranging the standpipe 7 via the elbow pipe 61, the standpipe 7 can be arranged at a position closer to the wall surface of the waist wall 2, in comparison with the configuration shown in FIG. By positioning the standpipe 7 close to the wall surface, the standpipe 7 can be positioned close to the wall surface of the waist wall 2 and the outer wall of the lower floor. This allows the length of the metal fittings that secure the standpipe 7 to the waist wall 2 and the outer wall to be shortened, thereby stabilizing the mounting structure of the standpipe 7 using the metal fittings.

[0049] Figure 14 shows a piping manhole member of the ninth embodiment according to the present invention. The piping manhole member 65 of the ninth embodiment has a pipe main body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has a configuration equivalent to that of the piping manhole member 3 of the first embodiment. The piping manhole 65 of the ninth embodiment is characterized in that no through-holes are formed in the bottom plate 22A of the pipe main body 22. The piping manhole 65 of the ninth embodiment shows, as an example, a piping manhole at the factory shipping stage before being attached to the upper end of the upright pipe 7. After manufacturing the piping manhole member 65 in the factory, it is transported to the installation site, where a worker forms a through hole of the required inner diameter in the bottom plate 22A on site to match the size of the standpipe at the site. By forming a through hole of the required inner diameter in the bottom plate 22A, the standpipe connection part 24 is completed. The piping box member 65 of the ninth embodiment can also provide the same effects as the piping box member 3 described above.

[0050] Figure 15 shows a piping manhole member of the tenth embodiment according to the present invention. The piping manhole member 70 of the tenth embodiment has a pipe main body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has a configuration equivalent to that of the piping manhole member 30 of the second embodiment. The piping manhole 70 of the tenth embodiment is characterized in that no through-holes are formed in the bottom plate 22A of the pipe main body 22. The piping manhole 70 of the tenth embodiment shows a piping manhole at the factory shipping stage, for example, before being attached to the upper end of the upright pipe 7. After manufacturing the piping manhole member 70 in the factory, it is transported to the installation site, where a worker can form a through hole of the required inner diameter in the bottom plate 22A on site to match the size of the standpipe at the site. By forming a through hole of the required inner diameter in the bottom plate 22A, the standpipe connection part 24 is completed. The piping box member 70 of the tenth embodiment can also provide the same effects as the previous piping box member 30.

[0051] Figure 16 shows an eleventh embodiment of a piping manhole member according to the present invention. The eleventh embodiment of the piping manhole member 75 has a pipe main body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, and has a configuration equivalent to that of the piping manhole member 30 of the second embodiment. The piping box member 75 of the eleventh embodiment is characterized in that a through-hole 22e for a nominal diameter of 75A is formed in the bottom plate 22A of the pipe main body 22. Because the pipe main body 22 is sized for a nominal diameter of 100A, the bottom plate 22A is large enough to form a through-hole of the nominal diameter of 100A, but the through-hole 22e for a nominal diameter of 75A is formed in the bottom plate 22A. As in the structure of the eleventh embodiment, a through-hole 22e corresponding to a nominal diameter of 75 A may be formed in a bottom plate 22A capable of forming a through-hole corresponding to a nominal diameter of 100 A. In this piping manhole member 75, a piping manhole member corresponding to a nominal diameter of 100 A is applied to a nominal diameter of 75 A, and a piping manhole member of a specific size can be used in common for two different sizes of standpipes. The piping box member 75 of the eleventh embodiment can also provide the same effects as the piping box member 30 described above.

[0052] Incidentally, all of the piping manhole members described so far are provided with a removable lid member 28 to allow access to the inside of the pipe main body 22 and other components. This is to enable the lid member 28 to be removed to clean the inside of the pipe main body 22. It is also to facilitate the installation of the siphon activation member 25. However, the lid member 28 is not an essential component and may be omitted. If the size of the horizontal pipe connection portion 23 is sufficiently large, or if the inside of the pipe main body portion 22 can be cleaned from the inside of the waist wall 2, the cover member 28 may be omitted and the upper part of the pipe main body portion 22 may be closed.

[0053] "Drainage capacity verification test" The following three types of verification tests were conducted to verify the effectiveness of the piping manhole component shown in Figure 1 when actually draining water. In the verification test, a three-story building 80 shown in Figure 17 was used, and a 30 cm wide, 35 cm deep, and 8 m long eaves gutter mockup 85 was installed on the third floor 83. A dogleg-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 86 (shown in Figure 18) was connected to one end wall 85a of the eaves gutter mockup 85, and the horizontal pipe connection portion 23 of the piping fitting 3 configured as shown in Figure 1 was connected to the tip of this horizontal pipe 86. A vertical pipe (nominal diameter 75A) 88 approximately 6 m high, extending from the third floor 83 of the building 80 to the first floor 81, was connected to the standpipe connection portion 24 of the piping manhole member 3. The standpipe 88 was connected via a connecting pipe 90 to a rainwater manhole 89 installed on the first floor 81. This rainwater manhole 89 was connected to a drainage pit 92 via a horizontal pipe 91 installed on the first floor 51. In the eaves gutter simulator 85, the roof drain 5 having the structure shown in FIG. 1 was placed inside the end wall 85a to which the horizontal pipe 86 was connected.

[0054] The first verification test was conducted using the verification test device described above to verify the drainage performance when a predetermined amount of water was flowed into the eaves gutter simulator 85. The verification test was conducted by flowing a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) into the eaves gutter, passing the tap water through a 30 cm long horizontal pipe 86 and a piping manhole 3, and then discharging the tap water into a vertical pipe 88, and measuring the water level (referred to as the "underwater water level") at a position 50 cm away from the end wall 85a of the eaves gutter simulator 85. The results of the first verification test are shown in Figure 20.

[0055] In the second verification test, in the verification test device described above, the horizontal pipe 86 attached to the end wall 85a of the eaves gutter simulator 85 was removed, and instead, an L-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 95 was connected to the side wall 85b 45 cm away from the end wall 85a of the eaves gutter simulator 85, as shown in Figure 19. The horizontal pipe connection part 23 of the piping box member 3 configured as shown in Figure 1 was connected to the tip of this horizontal pipe 95. The length of the horizontal pipe 95 along the longitudinal direction of the eaves gutter simulator 85 was 1 m. A roof drain 5 configured as shown in Figure 1 was placed inside the side wall 85b to which the horizontal pipe 95 was connected in the eaves gutter simulator 85. The second verification test was carried out by running a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) into the eaves gutter, passing it through a 1 m long horizontal pipe 95, a piping manhole member 3 and draining it into a vertical pipe 88, and measuring the water level (referred to as the "underwater water level") at a position 50 cm away from the end wall 85a of the eaves gutter simulator 85. The results of the second verification test are shown in Figure 20.

[0056] In the third verification test, a verification test equivalent to the first verification test was conducted using the verification device used in the first verification test, but with a 90° Y-shaped pipe as a joint instead of the piping box member 3, and a vertical pipe with a nominal diameter of 150A was connected to a horizontal pipe with a nominal diameter of 150A. The results of the third verification test are shown in Figure 20.

[0057] In the graph shown in Figure 20, the horizontal axis shows the amount of water (5 L / s, 10 L / s, 15 L / s, 20 L / s) flowing into the eaves gutter simulator, and the vertical axis shows the water level (0 to 300 mm) below the eaves gutter. As shown in the graph in Figure 20, in all verification tests, the underwater water level gradually rose as the amount of water flowing into the eaves gutter simulator 85 increased. In the graph shown in Figure 20, when comparing the same amount of water, a lower underwater water level indicates better drainage.

[0058] The third verification test result corresponds to a conventional example. In contrast, the first and second verification test results correspond to test examples in which a siphon member is provided in the present invention. Comparing the first verification test result using horizontal pipe 86 with the second verification test result using horizontal pipe 95, good drainage was demonstrated in both verification tests, although there was a slight difference in water level, whether the horizontal pipe length was 0.3 m or 1.0 m. This shows that the siphon phenomenon does not occur whether the horizontal pipe length is 1.0 m or 0.3 m. The third verification test, which corresponds to the conventional example, used a standpipe with a nominal diameter of 150A, which is twice the nominal diameter of 75A used in the first and second verification tests. It was found that the structure of the present invention exhibited superior drainage performance, even though it used a standpipe with a nominal diameter of 75A, which is half the diameter of the conventional structure. This is thought to be the result of the siphon actuation member 25 provided inside the piping joint utilizing the siphon phenomenon to allow smooth drainage. [Explanation of symbols]

[0059] S...Drainage piping system, 1...roof floor, 2...waist wall, 3...Piping joints, 5...Roof drain, 6...Horizontal pipe, 7...vertical pipe, 8...exterior wall, 22...Pipe body part, 22a...opening, 23...Horizontal pipe connection part, 24...Standby pipe connection part, 25...Siphon starting member, 26...Reduced diameter part, 28...Cover member, 28b...slope, 28e…straightening plate, 30... rectifier plate, 35, 40, 50...Pipe fittings.

Claims

1. A drainage piping system comprising a horizontal pipe, a vertical pipe, and a piping box member connecting the horizontal pipe and the vertical pipe, The piping box member and the vertical pipe are connected via a connecting member, The piping box member is a pipe body portion; and a bottom plate formed at a lower portion of the pipe body portion and to which the vertical pipe is connected; The bottom plate is provided with a through hole, The connecting member is attached to a lower portion of the through-hole, the connecting member has a flange portion attached to the lower surface of the bottom plate and a connecting tubular portion formed below the flange portion, The outer diameter of the connecting tube portion is smaller than the inner diameter of the through hole, The inner diameter of the vertical pipe is smaller than the inner diameter of the horizontal pipe. Drainage piping system.

2. The drainage piping system according to claim 1, wherein the inner diameter of the vertical pipe is 1 / 2 to 1 / 1 of the inner diameter of the horizontal pipe.

3. a siphon actuation member attached to an upper surface of the bottom plate and connected to the connecting member; the siphon activation member is inserted into the through hole and has an external thread portion that threadably engages with the connecting tube portion of the connecting member. The drainage piping system according to claim 1 or 2.

4. A piping manhole member used in the drainage piping system according to any one of claims 1 to 3, The pipe body is closed by the bottom plate, The bottom plate is sized to allow a through hole with a nominal diameter of 75A or 100A to be formed therein. Piping manhole parts.

5. A piping manhole member used in the drainage piping system according to any one of claims 1 to 3, The pipe body is closed by the bottom plate, The pipe body is rectangular in plan view. Piping manhole parts.

6. A piping manhole member used in the drainage piping system according to any one of claims 1 to 3, a siphon actuation member attached to an upper surface of the bottom plate and connected to the connecting member; The siphon activation member is inserted into the through hole and is screwed into the connecting tube portion of the connecting member. Piping manhole parts.

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