Piping structure

Abstract

To provide a piping structure that allows inspection and cleaning.SOLUTION: A piping structure according to the present invention comprises a leg joint having a vertical pipe part to which a vertical pipe is connected, a horizontal pipe connection part to which a horizontal pipe is connected, and a bent pipe part connecting the vertical pipe part and the horizontal pipe connection part, wherein the structure further comprises a first support part that connects the horizontal pipe connection part disposed below a floor slab and the floor slab, and, in a side view of a peripheral wall of the bent pipe part and a central axis of the bent pipe part, an inspection port is formed in a region below or outside the central axis.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a piping structure. [Background technology]

[0002] Apartment buildings and hotels generally use a single-pipe drainage system. A multi-way branched joint is installed in the pipe shaft (PS) in the rooms on each floor, and horizontal drainage pipes from each drainage fixture are connected to it. The collective joint is buried in the slab and piped. Above the slab (above floor), it has multiple openings so that it can be connected to horizontal drainage pipes from multiple directions, and it has a connection structure above and below the slab so that it can be connected to vertical pipes. As a conventional example of this type of collective joint, a piping structure using a resin collective joint as described in Patent Document 1 below has been known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-153072 Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Document 1, in multi-story buildings such as condominiums and hotels, the load of drainage from the upper floors acts on the leg joints that connect to the horizontal pipes at the bottom end of the standpipes on the lowest floor. For this reason, a structure is adopted in which suspension bolts are fixed to the underside of the slab, and the leg joints are supported using these suspension bolts and support fittings. It is necessary to provide an inspection hatch at the leg joint for cleaning the inside of the pipe, checking for clogged pipes, etc. However, leg joints are often installed near the slab in the basement or in narrow pipe spaces, and when there are restrictions on the support form of the pipes and the state of connection with the horizontal pipes, there is a risk that sufficient working space cannot be secured around the inspection hatch provided at the leg joint.

[0005] In view of the above-mentioned circumstances, the present invention aims to provide a piping structure in which an inspection hatch is provided at a suitable position on the leg joint connected below the standpipe, thereby ensuring the working space necessary for inspection and cleaning work even if there are restrictions on the installation environment or installation space. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following aspects. "1" The piping structure of this embodiment comprises a leg joint having a vertical pipe section to which a vertical pipe is connected, a horizontal pipe connection section to which a horizontal pipe is connected, and a curved pipe section connecting the vertical pipe section and the horizontal pipe connection section, and a first support section that connects the horizontal pipe connection section, which is positioned below the floor slab, to the floor slab, and is characterized by having an inspection hatch whose center is located in a region below or outside the central axis when the curved pipe section and the central axis of the curved pipe section are viewed from the side.

[0007] According to this embodiment, the inspection hatch has its center located below or outside the central axis when the curved pipe section and the central axis of the curved pipe section are viewed from the side. In multi-story buildings, the portion where the lower end of the standpipe connects to the horizontal pipe is often located near the slab of a basement or near the ceiling of a narrow pipe space. If the inspection hatch of the bent pipe section is located below or outside the central axis of the bent pipe section, it is easy to secure the space necessary for inspection and cleaning, even if the bent pipe section is located near the slab of a basement or near the ceiling of a pipe space. Therefore, a piping structure that makes inspection and cleaning easy can be provided. Furthermore, even if the bent pipe section is located so that a horizontal pipe is connected near the ceiling of an apartment building entrance, the inspection hatch can be located in a position that ensures work space, and the inspection hatch of the leg joint can be opened and closed from an inspection hatch installed in the ceiling, etc., to perform inspection or cleaning work.

[0008] "2" In the piping structure of this embodiment, a configuration can be adopted in which, when the curved pipe section is viewed from the front in the direction of the central axis of the horizontal pipe, the angle between the central axis of the inspection hatch and the central axis of the vertical pipe is less than 45°.

[0009] By locating the inspection hatch within a range where the angle between the central axis of the inspection hatch and the central axis of the vertical pipe is less than 45 degrees, workers can easily secure work space, even in structures where the leg joint is located near the basement slab, or where the ceiling or wall is installed near the leg joint, and can perform inspection or cleaning work while avoiding interference with the slab or wall.

[0010] "3" In the piping structure according to this embodiment, a configuration can be adopted in which the inspection hatch faces in the same direction as the central axis of the standpipe.

[0011] The fact that the inspection hatch on the leg joint faces in the same direction as the central axis of the standpipe means that the inspection hatch is located on the lower side of the leg joint. In this case, it is possible to secure work space while avoiding interference with the basement slab and ceiling, and to carry out inspection and cleaning work.

[0012] [4] In the piping structure according to this embodiment, a configuration can be adopted in which the inspection hatch faces in the same direction as the central axis of the horizontal pipe.

[0013] The inspection hatch on the leg joint faces in the same direction as the central axis of the horizontal pipe, meaning that the inspection hatch is located on the front side of the leg joint. In this case, work space can be secured while avoiding interference with the basement slab and ceiling, allowing for inspection and cleaning work to be carried out.

[0014] [5] In the piping structure according to this embodiment, a configuration can be adopted in which a cover member is attached to the inspection hatch, and the cover member is detachably fitted to the inspection hatch via a bayonet portion.

[0015] By providing a detachable cover member via a bayonet on the inspection hatch, workers can easily remove the cover member from the leg joint during inspection or cleaning work. Therefore, even in installation environments where the first support member is located around the leg joint, or where interference with the slab, ceiling, or surrounding walls is possible, the inspection hatch can be opened and closed without any problems. This makes inspection or cleaning work easier.

[0016] [6] In the piping structure according to this aspect, a configuration can be adopted in which the cover member is formed of impact-resistant vinyl chloride resin.

[0017] By forming the lid member from impact-resistant vinyl chloride resin, the lid member is less likely to be damaged, and a lid member with excellent durability can be provided, even when subjected to repeated cleaning and inspection work.

[0018] [7] In the piping structure according to this embodiment, the leg joint may be made of resin.

[0019] If the leg joint is made of resin, it can be made lighter than a metal leg joint. [Effects of the Invention]

[0020] According to the piping structure of this embodiment, the inspection hatch of the bent pipe section is located below or outside the central axis of the bent pipe section in a side view. Therefore, if the leg joint is located near the slab or ceiling of a basement or near the wall of a pipe space, the inspection hatch is located in a position that makes it easy to secure work space when carrying out inspection or cleaning work. This makes it possible to provide a piping structure that makes inspection and cleaning work easy. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a vertical cross-sectional view of a main part of a multi-story building to which a piping structure according to a first embodiment of the present invention is applied. [Figure 2] FIG. 4 is a plan view of a leg joint in the piping structure. [Figure 3]FIG. 10 is a rear view showing the leg joint and the second support part in the piping structure. [Figure 4] FIG. 10 is a cross-sectional view showing a second example of an inspection hatch that can be applied to the same piping structure. [Figure 5] FIG. 10 is a plan view showing the range of installation positions for inspection hatches that can be applied to the piping structure. [Figure 6] FIG. 10 is a front view showing the range of installation positions for inspection hatches that can be applied to the piping structure. [Figure 7] FIG. 10 is a side view showing the range of installation positions for inspection hatches that can be applied to the piping structure. [Figure 8] FIG. 10 is a side view showing a third example of an inspection hatch that can be applied to the piping structure. [Figure 9] FIG. 10 is a plan view showing a third example of an inspection hatch that can be applied to the same piping structure. [Figure 10] FIG. 10 is a side view showing an example of installation applicable to the piping structure. [Figure 11] FIG. 6 is a vertical cross-sectional view of a main part of a multi-story building to which a piping structure according to a second embodiment of the present invention is applied. [Figure 12] FIG. 10 is a rear view of the leg joint and the second support part in the piping structure. [Figure 13] FIG. 10 is a side view showing the range of installation positions for inspection hatches that can be applied to the piping structure. [Figure 14] FIG. 10 is a side view showing an example of an installation position of an inspection hatch applicable to the same piping structure. [Figure 15] FIG. 10 is a plan view showing the range of installation positions for inspection hatches that can be applied to the piping structure. [Figure 16] 10 is a side view showing a detachable cover member applicable to the piping structure according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] (First embodiment) A multi-storey building (architecture) to which a first embodiment of the piping structure according to the present invention is applied will be described below with reference to Figs. 1 to 3, taking as an example a case where the piping structure is a drainage structure. As shown in Fig. 1, in a multi-story building 1, a plurality of stories 5 stacked in the vertical direction are separated by floor slabs 6 provided in the multi-story building 1. The floor slabs 6 have through holes 6a formed therein that penetrate in the vertical direction.

[0023] The drainage structure 11 is used in a multi-story building 1. The drainage structure 11 includes a leg joint 12, a joint assembly 26, vertical pipes 36, 37, horizontal pipes 39, 40, a first support portion 46, and a second support portion 51. As shown in Figures 1 and 3, the leg joint 12 includes a vertical pipe section 13, a horizontal pipe section 14, and a curved pipe section 15. In Figure 1, the boundary between the horizontal pipe section 14 and the curved pipe section 15 is indicated by a two-dot chain line. In Figure 3, the first support section 46 is indicated by a two-dot chain line.

[0024] The standpipe section 13 is formed in a straight pipe shape and is arranged so that the central axis O3 of the standpipe section 13 is along the vertical direction (i.e., so that the central axis O3 of the standpipe section 13 coincides with the pipe axis of the standpipe 37). The standpipe section 13 is arranged below the floor slab 6. Note that the arrangement of the standpipe section 13 is not limited to this, and the standpipe section 13 may be arranged so that the central axis O3 is inclined with respect to the vertical direction. A standpipe connection section 18, which is a receptacle, is formed in the standpipe section 13. Note that the connection type of the standpipe connection section 18 is not limited to a receptacle, and may be a spigot, a flange, or the like. When the connection type of the standpipe connection section 18 is a receptacle, the standpipe connection section 18 may be provided with a rubber gasket for waterproofing inside, and when the standpipe 37 is made of resin, the standpipe connection section 18 may be connected to the standpipe 37 with an adhesive. The same applies to the horizontal pipe connecting portion 19, horizontal pipe connecting portion 31, etc., which will be described later, in terms of the relationship between the spigot and the socket, the relationship between the rubber packing and the connection, etc.

[0025] The horizontal pipe section 14 is formed in a straight pipe shape and is arranged so that the central axis O2 of the horizontal pipe section 14 is approximately along a horizontal plane. More specifically, the horizontal pipe section 14 is arranged so that the central axis O2 points downward as it moves downstream, forming a drainage gradient in the horizontal pipe section 14. A horizontal pipe connection portion 19, which is a flange, is formed at the downstream end of the horizontal pipe portion 14. In this example, the length L2 of the horizontal pipe section 14 along the central axis O2 is longer than the length L1 of the vertical pipe section 13 along the central axis O3. For example, if the horizontal pipe section 14 does not have a portion along the central axis O2, if the portion along the central axis O2 is short, or if the portion of the horizontal pipe section 14 that is supported by the first support section 46 is curved, it becomes difficult to support the horizontal pipe section 14 by the first support section 46. In contrast, by forming the horizontal pipe section 14 into a straight pipe shape as in this embodiment, it becomes easier to support the horizontal pipe section 14 by the first support section 46. The vertical pipes 36, 37 and horizontal pipes 39, 40 can be selected from a nominal diameter of about 75A to 150A, but applicable nominal diameters are not limited to the above range.

[0026] The curved pipe section 15 is made of a curved pipe that is approximately L-shaped in side view. The curved pipe section 15 connects the vertical pipe section 13 and the horizontal pipe section 14. Alternatively, the curved pipe section 15 is connected to the horizontal pipe connection section 19 via the horizontal pipe section 14. A cylindrical boss 20 is formed at the bottom of the curved pipe section 15. The boss 20 protrudes downward from the outer peripheral surface of the bottom of the curved pipe section 15. In this example, the entire leg joint 12, which includes the vertical pipe section 13, the curved pipe section 15, the horizontal pipe section 14, and the horizontal pipe connection section 19, is positioned below the floor slab 6. The leg joint 12 may be made of a resin such as polyvinyl chloride resin (PVC), etc. The leg joint 12 is preferably made of a resin that has excellent impact resistance.

[0027] Examples of impact-resistant resins include (1) resins obtained by mixing polyvinyl chloride polymers with impact-modified resins, (2) resins obtained by graft copolymerization of polyvinyl chloride polymers with impact-modified resins, (3) copolymers of vinyl chloride monomers with monomers having unsaturated bonds copolymerizable with the vinyl chloride monomers, and (4) graft copolymers obtained by graft copolymerization of vinyl chloride with (co)polymers other than vinyl chloride. These resins (1) to (4) may be used alone or in combination. Furthermore, the aforementioned polyvinyl chloride resins may be chlorinated as necessary. By using these impact-resistant vinyl chloride resins, a leg joint 12 with excellent durability can be constructed.

[0028] Examples of the impact-improving resin to be mixed with the polyvinyl chloride polymer in the resin (1) above, and the impact-improving resin to be graft-copolymerized with the polyvinyl chloride polymer in the resin (2) above, include resins having rubber properties. Specific examples include acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, acrylic rubber, chlorinated polyethylene, ethylene-vinyl acetate copolymer resin, and acrylonitrile-butadiene copolymer. These may be used alone or in combination of two or more. The leg joint 12 may be made from metal, particularly cast iron. If the leg joint 12 is made of resin, a soundproof sheet may be wrapped around the leg joint 12 to prevent noise caused by the drainage water flowing inside.

[0029] There are no particular limitations on the configuration of the collective joint 26. In this example, the collective joint 26 is made up of two members: an upper connecting pipe 27 and a lower connecting pipe 28. The collective joint may be integrally made up of one member, or may be made up of three or more members. The upper connecting pipe 27 comprises a pipe main body 30, a horizontal pipe connecting portion 31 fixed to the outer peripheral surface of the pipe main body 30, and a vertical pipe connecting portion 32 fixed to the upper end of the pipe main body 30. The pipe main body 30 is disposed above the leg joint 12 so that its axis is aligned in the vertical direction. In this example, multiple horizontal pipe connecting parts 31 are fixed to the outer peripheral surface of the pipe main body 30. The number of horizontal pipe connecting parts 31 fixed to the pipe main body 30 is not particularly limited, and may be one, or two or more. The collective joint 26 may be made of a resin such as polyvinyl chloride resin (PVC), or may be made of a metal such as cast iron.

[0030] The lower connecting pipe 28 is formed in a tubular shape with its outer and inner diameters decreasing downward. The lower connecting pipe 28 may have approximately the same outer and inner diameters as the pipe body 30, but is at least equal to or larger than the outer and inner diameters of the standpipe 36. The lower end of the lower connecting pipe 28 is a spigot. The lower connecting pipe 28 is fixed to the lower end of the pipe body 30 of the upper connecting pipe 27. The lower end of the lower connecting pipe 28 may be a socket, a flange, or the like. The lower connecting pipe 28 may not be connected to the standpipe connecting portion 18 of the leg joint 12 via the standpipe 37, and the lower connecting pipe 28 of the manifold joint 26 may be directly connected to the standpipe connecting portion 18 of the leg joint 12.

[0031] In the collective joint 26 configured as described above, the horizontal pipe connection portion 31 and the vertical pipe connection portion 32 are positioned above the floor slab 6, and at least a portion of the lower connection pipe 28 is positioned within the through hole 6a of the floor slab 6. A filler 7 such as mortar is filled between the opening periphery of the through hole 6a in the floor slab 6 and the lower connecting pipe 28. The filler 7 is placed to close the through hole 6a. The filler 7 may be glass wool (GW), rock wool (RW), or the like. However, by using mortar as the filler 7, the positions of the lower connecting pipe 28 and the standpipe 37 relative to the floor slab 6 are fixed by the filler 7. Because glass wool and rock wool are made of fibers, the positions of the lower connecting pipe 28, etc., relative to the floor slab 6 cannot be fixed. Therefore, even if the weight balance of the leg joint 12 connected to the standpipe 37 is poor, the direction of the drainage gradient set in the horizontal pipe portion 14 of the leg joint 12 can be maintained.

[0032] The lower end of the standpipe 36 is connected to the standpipe connection portion 32 of the collecting joint 26. The standpipe 36 guides to the collecting joint 26 wastewater discharged from sanitary equipment (drainage equipment) such as toilets, vanities, sinks, etc. (not shown) that are arranged on a layer 5 (hereinafter also referred to as layer 5A) above the layer 5 on which the upper connecting pipe 27 of the collecting joint 26 is arranged. The upper end of the riser pipe 37 is connected to the lower end of the lower connecting pipe 28 of the joint assembly 26. The lower end of the riser pipe 37 is connected to the riser pipe connecting portion 18 of the riser pipe portion 13 in the leg joint 12.

[0033] The horizontal pipe 39 is connected to the horizontal pipe connection portion 31 of the collecting joint 26. The horizontal pipe 39 guides to the collecting joint 26 wastewater discharged from sanitary equipment (not shown) and the like arranged on the layer 5A. The horizontal pipe 40 is connected to the horizontal pipe connection portion 19 of the horizontal pipe portion 14 in the leg joint 12. The horizontal pipe 40 guides the wastewater led to the collection joint 26 via the leg joint 12 to a wastewater treatment facility (not shown) or the like outside the multi-story building 1.

[0034] 1 and 3, the first support section 46 is a so-called single-hanging type support section. The first support section 46 connects the horizontal pipe section 14 of the leg joint 12 to the floor slab 6. The first support section 46 includes a support bracket 47, a rod 48, and an anchor 49. Although not shown, the support fitting 47 includes, for example, a metal strip-shaped member and an opening / closing mechanism that connects both ends of the strip-shaped member to each other. The opening / closing mechanism can be switched between a connected state in which both ends of the strip-shaped member are connected to each other and a released state in which the connection between both ends is released. When the opening / closing mechanism is released, the horizontal pipe portion 14 of the leg joint 12 can be inserted into the U-shaped belt-shaped member from outside, or the horizontal pipe portion 14 can be removed from inside the belt-shaped member to outside. On the other hand, when the opening and closing mechanism is in the connected state, the horizontal tube portion 14 inside the belt-shaped member is fixed to the belt-shaped member.

[0035] A male screw is formed on the outer circumferential surface of the rod 48 over the entire length of the rod 48. The rod 48 is a so-called fully threaded bolt. The rod 48 is arranged so as to extend in the vertical direction. The lower end of the rod 48 is fixed to the strip-shaped member of the support bracket 47. The anchor 49 is embedded in the lower end of the floor slab 6. The female thread formed in the anchor 49 is exposed from the lower surface of the floor slab 6 to the outside of the floor slab 6. The male thread at the upper end of the rod 48 is fitted into the female thread of the anchor 49. The central axis O1 of the rod 48 is drawn in Figure 3. The configuration of the first support portion 46 is not limited to this.

[0036] 1 and 3, the second support portion 51 connects the curved pipe portion 15 of the leg joint 12 and the floor slab 6. The second support portion 51 includes a support member 52, a rod 53, a nut 54, and an anchor 55. The support member 52 has an L-shaped cross section perpendicular to the longitudinal direction. The support member 52 is arranged to extend in a direction along a horizontal plane, perpendicular to the central axis O2 of the horizontal pipe section 14. The support member 52 protrudes on both sides in the perpendicular direction beyond the leg joint 12. A through-hole (not shown) penetrating in the up-down direction is formed at each end of the support member 52 in the perpendicular direction. The support member 52 supports the boss 20 of the leg joint 12 from below the boss 20 .

[0037] The rods 53 are configured similarly to the rods 48, and are provided as a pair on the second support part 51. The rods 53 are arranged along the vertical direction. The lower ends of the rods 53 are inserted into through holes in the support member 52 and fixed to the support member 52 by nuts 54, 54. The anchor 55 is embedded in the lower end of the floor slab 6. The female thread formed in the anchor 55 is exposed from the lower surface of the floor slab 6 to the outside of the floor slab 6. The male thread at the upper end of the rod 53 is fitted into the female thread of the anchor 55. Although the second support portion 51 is configured to connect the curved pipe portion 15 and the floor slab 6, the second support portion may also be configured to connect the vertical pipe portion 13 of the leg joint 12 and the floor slab 6, or the second support portion may be configured to connect the vertical pipe portion 13 and curved pipe portion 15 of the leg joint 12 and the floor slab 6.

[0038] Each of the first support portion 46 and the second support portion 51 may include rubber having vibration-damping properties. This rubber is disposed, for example, between the strip-shaped member of the first support portion 46 and the horizontal tube portion 14. The first support portion 46 and the second support portion 51 may also be formed of resin instead of metal.

[0039] As shown in FIG. 1, a central axis that passes through the center of the vertical pipe portion 13 and is perpendicular to the central axis O2 is defined as a central axis O3. Furthermore, the central axis O4 is a central axis that passes through the portion where the second support portion 51 supports the leg joint 12 and is oriented perpendicular to the central axis O2. If the drainage structure 11 does not have the first support portion 46 and the stand pipe 37 and horizontal pipe 40 are not connected to the leg joint 12, the leg joint 12 may sway around the central axis O4. By connecting the leg joint 12 to the stand pipe 37 fixed to the floor slab 6 by the filler material 7, it is possible to prevent the leg joint 12 from swaying around the central axis O4.

[0040] In the piping structure described above, an inspection hatch 60 is formed in a portion of the peripheral wall of the curved pipe section 15, as shown in Figure 1. The inspection hatch 60 is formed at a position on the upper front side of the left end of the curved pipe section 15, close to the vertical pipe section 13, when the curved pipe section 15 is viewed from the side as shown in Figure 1. Here, the side on which the inspection hatch 60 is formed can be referred to as the front side of the curved pipe section 15, and the side on which the horizontal pipe 40 is connected to the curved pipe section 15 can be referred to as the back side of the curved pipe section 15. For this reason, a view of the curved pipe section 15 viewed from the side on which the horizontal pipe 40 is installed, as shown in Figure 3, can be referred to as a back view.

[0041] 1, in a side view of the curved pipe portion 15, the central axis O5 of the curved pipe portion 15 has a central axis portion O3a that is a downward extension of the central axis O3 that passes through the center of the upright pipe portion 13. The central axis O5 of the curved pipe portion 15 also has a central axis portion O2a that is a horizontal extension of the central axis O2. Furthermore, the central axis O5 of the curved pipe portion 15 has an arc-shaped central axis portion O5a that has a curvature that matches the curvature of the curved pipe portion 15 and connects the central axis portion O3a and the central axis portion O2a. That is, the central axis O5 of the curved pipe portion 15 is made up of a central axis O2a, a central axis O5a, and a central axis O3a when the curved pipe portion 15 is viewed from the side as shown in FIG.

[0042] When providing the inspection hatch 60 in the peripheral wall of the curved pipe portion 15, it is preferable to provide it in the peripheral wall of the curved pipe portion 15 either below the central axis O2a and central axis O5a or outside the central axis O3a and central axis O5a. In other words, when the curved pipe portion 15 and the central axis O5 of the curved pipe portion 15 are viewed from the side, it is preferable to provide the inspection hatch 60 so that its center is located in an area below or outside the central axis O5. The area below or outside the central axis O5 can also be expressed as the outside of the corner or the obtuse angle side of the corner, when the shape of the central axis O5 in a side view as shown in Figure 1 is recognized as a curve describing a rounded corner. 1, an inspection hatch 60 is formed outside the boundary between the central axis portion O3a and the central axis portion O5a in the curved pipe portion 15. The position where the inspection hatch 60 is formed can be expressed as being on the upper front side of the curved pipe portion 15, close to the vertical pipe portion 13.

[0043] The inspection hatch 60 has an inspection hatch 61 formed to penetrate the peripheral wall of the curved pipe 15. It also has a flange wall 62 with a flange plate that protrudes from the peripheral wall of the curved pipe 15 to surround the opening periphery of the inspection hatch 61, and a lid member 63 that closes the opening of the flange wall 62. The lid member 63 is preferably made of the same impact-resistant vinyl chloride resin that constitutes the curved pipe 15. The size of the inspection hatch 61 is preferably φ40 or more for the purpose of inserting a camera into the pipe and for cleaning purposes to prevent clogging.

[0044] A connecting bolt 64 is provided so as to penetrate the flange portion 62a of the flange wall 62 and the outer periphery of the cover member 63, and a nut 65 is screwed onto the tip of the connecting bolt 64. A plurality of connecting bolts 64 are provided intermittently along the outer periphery of the cover member 63 and the flange portion 62a of the flange wall 62. The connecting bolt 64 has a length sufficient to pass through the flange plate portion 62a of the flange wall 62 and the outer periphery of the cover member 63, and the cover member 63 can be pressed against the flange plate portion 62a and fixed by screwing a nut 65 onto the tip end of the connecting bolt 64. If the through hole for inserting the bolt formed in the flange plate portion 62a of the flange wall 62 is a stepped hole, the head side of the connecting bolt 64 can be installed with the head side hidden.

[0045] It is preferable to provide a protrusion (not shown) on the inner surface of the cover member 63 that is shaped to be inserted into the inside of the flange wall 62 and close the inspection hatch 61. It is also preferable that the tip surface of the protrusion has a concave curved surface that is flush with the inner circumferential surface of the curved pipe portion 15. Specific examples of the protrusion and concave curved surface formed on the cover member 63 will be described later in the configuration based on Figure 4 or Figure 16. It should be noted that a mounting structure using a bayonet portion may be employed so that the cover member 63 can be easily and detachably mounted on the flange wall 62. The mounting structure provided with a bayonet portion will be described in detail later in the configuration explained with reference to FIG.

[0046] When providing an inspection hatch 60, the structure shown in FIG. 4 can be used as an example. An inspection hatch 56 that is circular in front view and extends from the bottom side of the horizontal pipe section 14 to a position close to the vertical pipe section 13 is formed on the front side of the peripheral wall of the curved pipe section 15. A cylindrical flange wall 57 is formed extending from the opening periphery of this inspection hatch 56 to the front side of the curved pipe section 15. In addition, a cylindrical protrusion 59 that closes the inspection hatch 56 and is equipped with a wall member 58 that also serves as the peripheral wall of the curved pipe section 15 is inserted into the flange wall 57. The protrusion 59 is formed to protrude from one side of the cover member 69. Wall member 58 has a concave portion 58a that is continuous and flush with the inner circumferential surface of curved pipe portion 15. As shown in Figure 4, when inspection hatch 56 is closed by wall member 58, concave portion 58a is formed in a curved shape that is continuous and flush with the inner circumferential surface of curved pipe portion 15. Lid member 69 has protrusion 59 inserted into flange wall 57, and can close the open end of flange wall 57 when inspection hatch 56 is closed by wall member 58. In the example shown in FIG. 4, an inspection hatch 73 is configured such that a cover member 69 having a protrusion 59 is detachably attached to a flange wall 57 .

[0047] As shown in Figure 4, a protrusion 59 and a wall member 58 are provided so as to be integrated with the cover member 69, and when the wall member 58 closes the inspection hatch 56, the concave portion 58a forms a curved surface that is continuous without any steps with the inner circumferential surface of the curved pipe portion 15. With this configuration, wastewater flowing in from the standpipe 37 can flow smoothly toward the horizontal pipe 40.

[0048] 1 to 4, an example has been described in which the inspection hatches 60, 73 are provided on the upper front side of the curved pipe section 15, but the locations where the inspection hatches 60, 73 are provided are not limited to the examples shown in FIGS. The inspection hatch 60 may be provided at a position within the range shown in FIG. 5, when a circle is drawn in plan view of the opening of the vertical pipe section 13, a first imaginary line K1 is drawn that starts from the central axis O3 and overlaps with a radius that passes through the center of the front side of the curved pipe section 15. This first imaginary line K1 passes through the center of the inspection hatch 61, and therefore coincides with the central axis of the inspection hatch 61. A second imaginary line K2 is drawn that is perpendicular to this imaginary line K1 and overlaps with the diameter of the circle formed by the opening of the vertical pipe section 13. In this case, the center of the inspection hatch section 60 (the center of the inspection hatch 61) is located in the area between the first imaginary line K1 and the second imaginary line K2, and should be within a 180° circumference of the vertical pipe section 13.

[0049] 5, the position of the inspection hatch 60, whose center is located along the first imaginary line K1 on the upper side of the peripheral wall of the curved pipe section 15, is shown by a solid line. It is preferable that the inspection hatch 60 (inspection hatch 61) is formed so that its center is located within a range of ±90° around the circumference of the vertical pipe section 13, that is, within a range of 180° around the circumference of the vertical pipe section 13, with the position of the first imaginary line K1 as the center. Figure 6 is a view from the front side of the curved pipe section 15 showing the positional range when an inspection hatch section 60 is provided on the upper side of the curved pipe section 15. The inspection hatch section 60 arranged along the first imaginary line K1 shown in Figure 5 is shown by a solid line in Figure 6, and the inspection hatch section 60 arranged along the second imaginary line K2 shown in Figure 5 is shown by a two-dot chain line in Figure 6.

[0050] FIG. 7 is a diagram illustrating the installation position range of the inspection hatch section 60 when the central axis O3 of the vertical pipe section 13 and the curved pipe section 15 are viewed from the side. When the curved pipe section 15 is viewed from the side as shown in Figure 7, it is preferable to provide the inspection hatch section 60 (inspection hatch 61) so that its center is located within the range from a position coinciding with the central axis O3 to a position coinciding with the imaginary line K7 that indicates the position of the left end side of the vertical pipe section 13 shown in Figure 7. When the leg joint 12 (curved pipe section 15) is viewed from the side as shown in Figure 1, this range can be expressed as being included outside the central axis O3a and central axis 5a, or below the central axis O5a and central axis O2a.

[0051] 8 and 9 are diagrams for explaining the installation position range of the inspection hatch section 60 when the central axis O3 of the vertical pipe section 13 and the leg joint 12 (curved pipe section 15) are viewed from the side. 8, an inspection hatch 60 may be provided on the underside of the horizontal pipe 14 in the peripheral wall of the leg joint 12. In this case, the installation position of the inspection hatch 60 corresponds to the lower side of the central axis O2a when the leg joint 12 (curved pipe 15) is viewed from the side.

[0052] FIG. 10 shows a piping structure in which an inspection hatch 75 is provided on the side of the leg joint 12 when the leg joint 12 (curved pipe portion 15) supported by the rod 53 is viewed from the side. In this piping structure, the positions of the rod 53 and the inspection hatch 75 interfere with each other when viewed from the side, which may hinder the removal of the cover member 76 that closes the inspection hatch. Even with the piping structure shown in Figure 10, it is possible to remove the cover member 76 if the length of the support member 52 is sufficient and the horizontal distance between the rod 53 and the inspection hatch 75 is increased. However, if the installation space is limited, such as when the installation position of the leg joint 12 is narrow and sandwiched between walls, it is thought that removal of the cover member 76 may be hindered if the support member 52 is not long enough.

[0053] Taking these circumstances into consideration, it is preferable that the installation position of the inspection hatch 60 be located as low as possible from the central axis O2a shown in FIG. 1 when the leg joint 12 (curved pipe portion 15) is viewed from the side. For example, if an inspection hatch 60 is provided at a position near the standpipe 13 at the center of the front side of the curved pipe 15 as shown in Figure 6, it is assumed that the range in which the inspection hatch 60 can be provided is as shown by the two-dot chain lines on both the left and right sides of the curved pipe 15 shown in Figure 6. A third imaginary line K3 is drawn connecting the centers of the inspection hatches 60 provided at these three locations, and a fourth imaginary line K4 is drawn that is perpendicular to the third imaginary line K3 and passes through the center of the inspection hatch 60 at the center of the front side. When the standpipe 13 is viewed from the front side as shown in Figure 6, the fourth imaginary line K4 coincides with the central axis O3 of the standpipe 13. The angle between the third imaginary line K3 and the fourth imaginary line K4 is 90°, but the fifth imaginary line K5 and the sixth imaginary line K6 are drawn to indicate a range of ±45° with respect to the fourth imaginary line K4 (central axis O3).

[0054] When the third imaginary line K3 to the sixth imaginary line K6 are determined, a more preferable range for providing the inspection hatch 60 is the range sandwiched between the fifth imaginary line K5 and the sixth imaginary line K6. That is, it is more preferable to provide the inspection hatch 60 (inspection hatch 61) so that its center is located within a range of less than ±45° about the fourth imaginary line K4 (central axis O3) when the curved pipe section 15 is viewed from the front as shown in Figure 6. This range is synonymous with the angle between the central axis of the inspection hatch 61 and the central axis O3 of the standpipe 37 being less than 45° when the curved pipe section 15 is viewed from the front in the direction of the central axis of the horizontal pipe 40. Although it is preferable to install it within the range of less than ±45° as mentioned above, it is necessary to restrict the location of the inspection hatch 60 to an area below or outside the central axis O5 when the curved pipe section 15 and the central axis O5 are viewed from the side as shown in Figure 1.

[0055] "Effects of the piping structure shown in Figures 1 to 9" 1 to 9, the inspection hatch 60, 73 has its center located in a region below or outside the central axis O5 when the curved pipe section 15 and the central axis O5 are viewed from the side. In the case of a multi-story building 1, the leg joint 12 is often provided near the slab in a basement or near the ceiling of a narrow pipe space. If the inspection hatch 60 of the curved pipe section 15 is located below or outside the central axis O5 of the curved pipe section 15, it is easy to secure the space necessary for inspection and cleaning, even if the curved pipe section is located near the slab of a basement or near the ceiling of a pipe space. This provides a piping structure that facilitates inspection and cleaning. Even if the curved pipe section 15 is located so that a horizontal pipe is connected near the ceiling of an apartment building entrance, for example, if the inspection hatch 60, 73 is located in a direction that allows for work space, the inspection hatch 60, 73 of the leg joint 12 can be opened and closed from an inspection hatch (not shown) in the ceiling, allowing for reliable inspection and cleaning.

[0056] 6, the center of the inspection hatch 60 can be located within a range of less than ±45° around the fourth imaginary line K4 (central axis O3). In this case, even in a structure in which the leg joint 12 is located near the basement slab, or in a structure in which a ceiling or wall is installed near the leg joint 12, workers can easily secure work space and perform inspection or cleaning work while avoiding interference with the slab or wall.

[0057] As shown in Figure 8, the inspection hatch 60 provided in the leg joint 12 faces in the same direction as the central axis of the standpipe 37 (central axis O3), which means that the inspection hatch is located on the lower side of the leg joint 12. In this case, a large work space can be secured while avoiding interference with the basement slab, ceiling, etc., allowing for inspection and cleaning work to be carried out. 1, 4, and 6, when the inspection hatches 60, 73 provided in the leg joint 12 face in the same direction as the central axis O2 of the horizontal pipe connection part 19, the inspection hatches 60, 73 are located on the front side of the leg joint 12. In this case, a large work space can be secured while avoiding interference with the basement slab, ceiling, rod 53, etc., allowing inspection and cleaning work to be carried out. 1 to 3, 5 to 6, and 8 to 9, even if wastewater flows in forcefully from standpipe 37, it is unlikely that a large water pressure from the wastewater will act on inspection hatch 60. Therefore, the structure shown in these figures makes it unlikely that problems such as water leakage will occur at inspection hatch 60, even if used for a long time.

[0058] "Second embodiment" 11 and 12 are vertical cross-sectional views of the main parts of a multi-storey building to which a piping structure according to a second embodiment of the present invention is applied. In the piping structure of the second embodiment, the upper side of the curved pipe portion 15 is supported by a rod 53 instead of the second support portion 51 of the first embodiment shown in FIG. 11 and 12, a drainage structure 11B may be provided with a second support portion 66 and a third support portion 71 instead of the leg joint 12, the vertical pipe 37, the horizontal pipe 39, and the second support portion 51 of the previous first embodiment. In this second embodiment, a vertical pipe connection portion 18A, which is a flange, is formed in the vertical pipe portion 13. In this configuration, the outer diameter and inner diameter of the horizontal pipe section 14 are larger than the outer diameter and inner diameter of the vertical pipe section 13. In the curved pipe section 15, the outer diameter and inner diameter gradually increase from the vertical pipe section 13 side toward the horizontal pipe section 14 side.

[0059] The second support portion 66 connects the vertical pipe portion 13 of the leg joint 12 and the floor slab 6. The second support portion 66 includes support pieces 67, 68, a rod 53, a nut 54, and an anchor 55. The support pieces 67 and 68 sandwich the vertical pipe portion 13 of the leg joint 12 in the radial direction of the vertical pipe portion 13. A pair of rods 53 are provided on the second support portion 66. The lower end of each rod 53 is fixed to support pieces 67, 68. The male threads on the upper end of each rod 53 are fitted into the female threads of each anchor 55, respectively.

[0060] In the second embodiment, the lower end of the standpipe 36 is connected to the standpipe connecting portion 18A of the standpipe portion 13. The third support portion 71 is a so-called single-hanging type support portion, and is configured similarly to the first support portion 46. The third support portion 71 connects the horizontal pipe 40 and the floor slab 6 together.

[0061] In the piping structure shown in Figures 11 and 12, the central axis O5 of the curved pipe portion 15 has a central axis portion O2a, a central axis portion O5a, and a central axis portion O3a when the leg joint 12 (curved pipe portion 15) is viewed from the side as shown in Figure 11. 11, when an inspection hatch 60 is provided in the peripheral wall of the curved pipe section 15, it is preferable to provide it in the peripheral wall of the curved pipe section 15 below the central axis sections O2a and O5a and outside the central axis sections O3a and O5a. In other words, when the curved pipe section 15 and the central axis O5 of the curved pipe section 15 are viewed from the side, it is preferable to provide the inspection hatch 60 so that its center is located in an area below or outside the central axis O5.

[0062] In the piping structure shown in FIG. 11, the range of installation positions of the inspection hatch 60 is the same as in the piping structures of the first embodiment and other examples. For example, when the curved pipe section 15 is viewed from the side as shown in Figure 13, it is preferable that the center of the inspection hatch section 60 is positioned in the area between the imaginary line K8 indicating the position of the left end side of the vertical pipe connection section 18A and the imaginary line K9 indicating the position of the left end side of the horizontal pipe connection section 19. 13 and 14 show examples of arrangements in which the inspection hatch 60 is arranged on the bottom side of the curved pipe section 15 between the imaginary lines K8 and K9 of the curved pipe section 15. FIG.

[0063] Figure 15 shows the installation range when the inspection hatch section 60 is placed circumferentially around the vertical pipe connection section 18A in the case of the piping structure shown in Figures 11 and 12, in accordance with the installation range of the inspection hatch section 60 in the circumferential direction of the vertical pipe section 13 shown in Figure 5 in the first embodiment. 15, when the opening of the riser pipe connection portion 18A is viewed from above, a first imaginary line K1 is drawn that starts from the central axis O3 and overlaps with a radius that passes through the center of the front side of the curved pipe portion 15. A second imaginary line K2 is drawn that is perpendicular to this imaginary line K1 and overlaps with the diameter of the circle described by the riser pipe connection portion 18A. In this case, it is sufficient that the center of the inspection hatch portion 60 is within a range of 180° around the riser pipe portion 13 that is sandwiched between the first imaginary line K1 and the second imaginary line K2.

[0064] FIG. 16 shows an example of a structure in which a cover member is provided via a bayonet portion as a mechanism for opening and closing an inspection hatch portion (inspection hatch) formed in a curved pipe portion 15. In the bent pipe section 15 shown in FIG. 16, an inspection hatch 61 is formed at the same position as the inspection hatch 61 applied to the piping structure shown in FIG. A low, cylindrical extension wall 80 is formed on the peripheral wall of the curved pipe section 15 at a position surrounding the inspection hatch 61 so as to protrude from the peripheral wall, and a lid member 81 is provided to open and close the opening of this extension wall 80. A plurality of L-shaped engagement grooves 82 are formed around the periphery on the inner peripheral surface of the extension wall 80. One end of the engagement groove 82 is formed so as to reach the opening of the extension wall 80, and the rear portion of the engagement groove 82 extends in the same circumferential direction along the inner circumference of the extension wall 80. A plurality of engagement grooves 82 are formed on the inner peripheral surface of the extension wall 80 at predetermined intervals in the circumferential direction.

[0065] The cover member 81 is sized to close the opening of the inspection hatch 61. A cover portion 83 is formed on the inner surface of the cover member 81. The cover portion 83 is inserted into the interior of the extension wall 80 and has a concave surface 83a that is flush with the inner circumferential surface of the curved pipe portion 15 when the cover member 81 closes the inspection hatch 61. The peripheral wall of the cover portion 83 is formed with a plurality of engagement protrusions 84 that can be inserted into the engagement grooves 82 when the cover portion 83 is inserted into the extension wall 80. The number of engagement protrusions 84 is the same as the number of engagement grooves 82. The engagement protrusions 84 are also formed so that they can be aligned with the engagement grooves 82 located at the opening of the extension wall 80 when the cover portion 83 is inserted into the extension wall 80. A ring-shaped gasket 85 is inserted into the interior of the extension wall 80.

[0066] The cover member 81 can be inserted into the extension wall 80 by aligning the engagement protrusion 84 with the engagement groove 82. When the cover member 83 is rotated a predetermined angle inside the extension wall 80, the engagement protrusion 84 moves to the inner side of the engagement groove 82. When the engagement protrusion 84 moves to the innermost part of the engagement groove 82, the cover member 81 will no longer rotate, and the cover member 81 will be engaged with the extension wall 80. When the cover member 81 is engaged with the extension wall 80, the concave surface 83a is flush with and continuous with the inner peripheral surface of the curved pipe portion 15. The structure provided with the extension wall 80, the engagement groove 82, the cover member 81, and the engagement protrusion 84 can be called a bayonet portion 86.

[0067] If the cover member 81 is equipped with this bayonet portion 86, the inspection hatch 61 can be easily opened and closed by rotating the cover member 81 without using a screw mechanism such as a bolt or nut. When a piping structure is configured using leg joints 12 equipped with bayonet portions 86, even if the piping structure is applied to a narrow space or narrow area during inspection work, cleaning work, etc., a piping structure can be provided that allows workers to easily open the inspection hatch 61 to perform the inspection or cleaning work. Furthermore, after the inspection or cleaning work is completed, the installation of the lid member 81 can be completed simply by inserting the lid portion 83 inside the extension wall 80 and rotating it. In the piping structure shown in FIG. 16, packing 85 is inserted inside cover member 81, so the portion where inspection hatch 61 is provided is sufficiently waterproof, and problems such as water leakage do not occur. [Explanation of symbols]

[0068] 1...Multi-story building (building), 6...Floor slab, 7...Filling material, 11...Drainage structure, 11B...Drainage structure, 12...Leg joint, 13...standpipe section, 14...horizontal pipe part, 15...Bent pipe section, 19...Horizontal pipe connection part, 36, 37...Stand pipe, 39, 40...horizontal pipe, 46...first support part, 51...second support part, 56...Inspection hatch, 60...Inspection hatch, 61...Inspection hatch, K1: First imaginary line (center axis of inspection hatch), 66...Second support part, 73...Inspection hatch, 80...extension wall, 81...Cover member, 82...engagement groove, 83...Lid part, 84...Engaging protrusion, 86...Bayonet section.

Claims

1. A leg joint having a vertical pipe section to which a vertical pipe is connected, a horizontal pipe connection section to which a horizontal pipe is connected, and a curved pipe section connecting the vertical pipe section and the horizontal pipe connection section; a first support portion that connects the horizontal pipe connection portion disposed below the floor slab and the floor slab; Equipped with When the curved pipe portion and the central axis of the curved pipe portion are viewed from the side, an inspection hatch is provided whose center is located in a region below or outside the central axis, Piping structure.

2. When the curved pipe portion is viewed from the front in the direction of the central axis of the horizontal pipe, the angle between the central axis of the inspection hatch and the central axis of the vertical pipe is less than 45°. The piping structure according to claim 1 .

3. The inspection hatch faces the same direction as the central axis of the standpipe. The piping structure according to claim 1 or 2.

4. The inspection hatch faces the same direction as the central axis of the horizontal pipe. The piping structure according to claim 1 or 2.

5. A cover member is attached to the inspection hatch, and the cover member is detachably fitted to the inspection hatch via a bayonet portion. The piping structure according to claim 1 or 2.

6. The cover member is made of impact-resistant vinyl chloride resin. The piping structure according to claim 5 .

7. The leg joint is made of resin. The piping structure according to claim 1 or 2.

Images