JP2018197424A - Pipe fitting - Google Patents

Abstract

To provide a pipe fitting which hardly generates such a situation that, when large amount wastewater is discharged at the same time from multiple confluent ports (vertical pipe), wastewater from the multiple confluent ports flows along the inner wall surface while spreading out in a fan shape and overlapping with each other.SOLUTION: The pipe fitting is a pipe fitting which is connected to a vertical drain pipe 11 forming a drainage channel a, and is formed with multiple junction ports for confluent drain channels b which join with the drainage channel a. On the inner wall surface 10b of the pipe fitting body 10a, multiple guide parts 12 are formed for guiding waste water flowing from vertical pipe junction parts (junction ports) 22b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe joint.

  Mainly, there is a so-called siphon drainage system that promotes drainage by siphon force in a building drainage system in an apartment house. As such a drainage system, for example, a drainage stack that passes through each floor, an instrument drainage pipe that is led from the water-related equipment on each floor, and a junction joint that connects the instrument drainage pipe to the drainage stack, In a drainage system that lowers the level of the joint from the level of the drainage floor slab, sufficiently applies the vertical velocity component to the fluid in the equipment drainer, and then merges it with the fluid in the drainage stack, An architectural drainage system (see Patent Document 1) is proposed in which appliance drainage pipes are arranged at equal intervals and connected to a junction joint, and the inner wall of the junction joint is a concave curved surface toward the center.

  In this building drainage system, the drainage discharged from the equipment drainage pipes (soot pipes, siphon drainage pipes) led from the water supply equipment (water supply equipment), while maintaining the momentum of the wastewater, The drainage discharged to the joint) flows along the wall surface inside the junction joint (joint joint) and joins the drainage stack.

JP 2002-121787 A

  However, in the above-mentioned conventional architectural drainage system, for example, when drainage is discharged simultaneously from a plurality of appliance drainage pipes (soot pipes) arranged at almost equal intervals surrounding the drainage standpipe, and a large amount, There was a possibility that the drainage from each appliance drain pipe (soot pipe) flowing along the inner wall surface of the junction joint (joint joint) would spread like a fan and overlap. If the drainage overlaps, depending on the state of overlap, there will be a part of the drainage that flows along the inner wall surface that will behave away from the inner wall surface and jump out toward the joint center in the joint radial direction. There was a fear.

If there is a part in the joint where the drainage behavior appears to jump out from the inner wall toward the joint center, which is the radial direction of the joint, depending on the situation, the drainage standpipe or confluence It is conceivable that the drainage channel in the joint is blocked. If the drainage flow path in the drainage stack or the junction joint is blocked, there is a risk that positive pressure and negative pressure may be generated in the drainage stack. For example, a device communicating through the junction joint Moisture traps (sealed water) installed in the water distribution pipes are sucked and pulled out on the upper floor due to the generation of negative pressure, or pushed out and ejected on the lower floor due to the generation of positive pressure. Can happen.
Accordingly, an object of the present invention is to provide a pipe joint that is unlikely to generate a situation in which a plurality of drains that flow from the junction and flow along the inner wall surface spread in a fan shape and overlap.

In order to achieve the above object, a pipe joint according to the present invention is a pipe joint that is connected to a drain pipe that forms a drainage channel, and is provided with a junction of a junction drainage channel that merges with the drainage channel, A guide portion is provided on the inner wall surface of the joint body to guide the drainage flowing from the junction. According to the pipe joint which concerns on this invention, it can make it difficult to generate | occur | produce the condition where several waste_water | drains which flow in from a junction port and flow along an inner wall face spread in a fan shape, and overlap.
In the pipe joint according to the present invention, it is preferable that the guide portion covers the inner wall surface so as to enclose drainage flowing from the junction. According to this structure, it can suppress that drainage jumps toward the joint center part used as the radial direction of a pipe joint.

In the pipe joint according to the present invention, it is preferable that the guide portion is formed by a vertical wall that rises from the inner wall surface at a side of drainage that flows from the junction. According to this configuration, the vertical wall can make it difficult to generate a situation where a plurality of drains flowing along the inner wall surface spread in a fan shape and overlap.
In the pipe joint according to the present invention, it is preferable that the merging drainage channel forms a flow path for generating a suction force by a siphon force. According to this configuration, even in the siphon drainage, it is possible to make it difficult to generate a situation in which a plurality of drains flowing from the junction and flowing along the inner wall surface spread in a fan shape and overlap.

  According to the present invention, it is possible to provide a pipe joint in which it is difficult to generate a situation in which a plurality of drains that flow from the junction and flow along the inner wall surface spread in a fan shape and overlap each other.

It is a fragmentary perspective view of the drainage channel where the pipe joint was attached which shows the external appearance shape of the pipe joint which concerns on 1st Embodiment of this invention. It is a fragmentary longitudinal cross-sectional view of the drainage channel in which the pipe joint was attached which shows the internal structure of the pipe joint of FIG. It is a piping structure conceptual diagram explaining the principle of the siphon drainage in the confluence | merging drainage channel which joins the pipe joint of FIG. It is explanatory drawing by the partial cross section of a pipe joint which shows the flow of the waste_water | drain in the inside of the pipe joint of FIG. It is a partial longitudinal cross-sectional view of the drainage channel to which the pipe joint was attached which shows the internal structure of the pipe joint which concerns on 2nd Embodiment of this invention. It is explanatory drawing by the partial cross section of a pipe joint which shows the flow of the waste_water | drain in the inside of the pipe joint of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG.1 and FIG.2, the pipe joint 10 which concerns on 1st Embodiment of this invention is connected to the drainage stand (drainage pipe) 11 which forms the drainage channel a, and joins the drainage channel a. A junction port for the junction drainage channel b is provided, and a plurality of guide portions 21 are provided on the inner wall surface 10b of the joint main body 10a to guide the drainage flowing from the junction port (a soot tube connecting portion 22b described later). (See FIG. 2).

As shown in FIG. 3, the pipe joint 10 of the present embodiment is used in, for example, a building drainage system in a multi-storey apartment building (for example, three or more floors), and drainage formed by a drainage stack 11 penetrating each floor. The combined drainage channel b formed by the junction drainage pipe 14 is connected to the drainage channel a by being connected to the junction drainage tube 14 that is incorporated in the channel a and communicates with drainage ports of various watering devices 13 installed on each floor. Are joined together.
In the building drainage system provided with the pipe joint 10 of the present embodiment, the wastewater from various water-circulating devices 13 is discharged from the junction port of the pipe joint 10 to the inside through the junction drain pipe 14 (see FIG. 3). The wastewater that flows in from the mouth is guided to the guide portion 21 provided on the inner wall surface 10b of the pipe joint 10 while maintaining the release momentum, and is discharged to the drainage stack 11 connected to the downstream side of the pipe joint 10. It flows down (see FIG. 2).

  In the present embodiment, the merged drainage channel b of the pipe joint 10 forms a flow path that generates a suction force by siphon force, and the merged drainage tube 14 that forms the merged drainage channel b is as shown in FIG. A horizontal pulling pipe (horizontal pipe) 14a and a horizontal pulling pipe 14a extending substantially vertically downward along the floor slab s of the floor on which the watering device 13 is installed. Thus, it is composed of a soot tube (outflow vertical tube) 14b that forms a drooping portion and generates a siphon force (eg, negative pressure).

  According to the siphon drainage system using such siphon drainage, the drainage pipe is filled with full-flow drainage, and the drainage pipe that forms the drainage channel can be arranged with no gradient. Full drainage can prevent solids from adhering to the inside of the pipe, and it is possible to use a small-diameter pipe. It is possible to reduce the height of the space under the floor to be extended and to increase the extension distance (for example, the length L of the horizontal pulling pipe 14a) from the drainage source (for example, various water-circulating devices 13) to the drainage stack. (Refer to FIG. 3), and the degree of freedom of the room layout can be increased.

  In the combined drainage channel b of the present embodiment, that is, the siphon drainage channel, the horizontal pulling is performed by the pressure of the drainage of the drainage water from the watering device 13 due to the height difference H1 between the outlet of the watering device 13 and the horizontal pipe 14a. Water is filled in the pipe 14a (horizontal length L), and by filling the horizontal pulling pipe 14a, drainage that has reached the dredging pipe 14b (hanging length H2) begins to fall down the dredging pipe 14b, and the horizontal pulling pipe 14a becomes full. As a result, siphon action occurs. By using this siphon action as drainage power, drainage from the water circulating device 13 is performed by a high-speed flow generated in the merge drainage pipe 14, and the drainage is discharged into the pipe joint 10.

  As shown in FIG.1 and FIG.2, the pipe joint 10 of this embodiment consists of the joint main body 10a which forms the flow path in a joint, the upstream connection part 22, and the downstream connection part 16, The joint body 10a has an upstream connection portion 22 at the opening of the joint body 10a upstream of the drainage channel a (upward in the drawing), and a downstream connection portion 16 at the opening of the joint body 10a downstream of the drainage channel a (downward in the drawing). Each is provided. In the joint main body 10a of the present embodiment, the downstream end portion of the downstream connection portion 16 has substantially the same shape as the drainage stack 11 and has an inner diameter substantially the same as the outer diameter of the drainage stack 11 (FIG. 1). , 2), the drainage stack 11 is connected to the upstream connection part 22 and the downstream connection part 16, respectively. In addition, you may form the upstream connection part 22 and the downstream connection part 16 in any one of a coupling main body or a different body.

  In the joint body 10a of the pipe joint 10 of the present embodiment, the diameter of the upstream opening provided with the upstream connecting portion 22 is larger than that of the downstream opening provided with the downstream connecting portion 16. The inner wall surface 10b is formed in a concave curved surface that protrudes outward from the upstream opening to the vicinity of the downstream opening (see FIG. 2). Since the inner wall surface 10b is formed in a concave curved surface shape, the drainage becomes easier to flow along the guide portion 21, and the behavior is such that the inner wall surface 10b jumps out from the inner wall surface 10b toward the joint central portion in the joint radial direction. , More difficult to happen. Moreover, as for the pipe body which forms the coupling main body 10a of the pipe coupling 10 of this embodiment, the downstream end has an inner and outer diameter substantially the same as the inner and outer diameter of the drainage stack 11 (see FIGS. 1 and 2). ).

In the present embodiment, the upstream side connection portion 22 has a circular planar shape, and the drainage stack 11 is inserted and connected substantially vertically at the center, together with a standpipe connection 22a that becomes an opening communicating with the drainage stack 11, Around the vertical pipe connecting portion 22a, the vertical pipe 14b is inserted and connected substantially vertically, and has a plurality (for example, five locations) of vertical pipe connecting portions 22b that serve as openings communicating with the vertical pipe 14b. It arrange | positions so that the upstream opening may be closed (refer FIG. 1, 2). Here, in order to allow the drainage to merge from a large number of merged drainage pipes 14 (saddle pipes 14b), the positional relationship between the drainage pipe connection portions 15b is such that when drainage flows simultaneously from the adjacent merged drainage pipes 14, When drainage flows into the pipe joint 10, it is assumed that there is a positional relationship such that it spreads in a fan shape and interferes with the flow path.
This dredging pipe connection part 22b becomes a confluence of the confluence drainage path b that joins the drainage path a, that is, a confluence drainage pipe 14 (conduit pipe 14b) that forms the confluence drainage path b, and the dredging pipe connection part 22b. The drainage of the merging drainage channel b flows into the pipe joint 10 from the vertical pipe 14b inserted and connected to the pipe 10, and the drainage stack 11 inserted and connected to the vertical pipe connection portion 22a enters the pipe joint 10 inside. The drainage of the drainage channel a flows in (see FIG. 2).

  In this embodiment, the downstream side connection part 16 is formed in the cylindrical shape which has the internal diameter substantially the same as the outer diameter of the drainage stack 11 which can insertly fit the drainage stack 11 (FIG. 1, FIG. 1). 2). By inserting and fitting the drainage stack 11 into the downstream connection portion 16, the downstream side of the pipe joint 10 communicates with the drainage stack 11, and the drainage channel a inside the pipe joint 10 is connected. The drainage and the drainage of the merged drainage channel b merge and flow out to the drainage stack 11 on the downstream side (see FIG. 2). However, the configuration of the downstream side connecting portion 16 is not particularly limited as long as the drainage in the pipe joint 10 is appropriately configured to flow into the drainage stack 11.

  As shown in FIGS. 2 and 4, in the pipe joint 10 of the present embodiment, a plurality (five as an example) of a plurality of (as an example) provided to extend from the upstream side to the downstream side along the inner wall surface 10b of the joint body 10a. Each of the guide portions 21 covers the inner wall surface 10b so as to contain the drainage from the merging drainage channel b that flows into the pipe joint 10 from the side pipe connecting portion 22b that is the merging port of the merging drainage channel b. For example, the inner wall surface 10b is formed in a tunnel shape having both side walls rising from the inner wall surface 10b. The guide portion 21 of the present embodiment has a length of about 1/3 of the upstream side of the inner wall surface 10b. In the present embodiment, the inner wall surface 10b covered with at least the guide portion 21 is arranged so that the soot pipe 14b is extended and arranged as it is inside the pipe joint 10 through the soot pipe connecting portion 22b of the upstream side connecting portion 22. It is formed continuously with the inner peripheral surface of the soot tube connecting portion 22b (see FIGS. 2 and 4). In the present embodiment, the guide portion 21 has a cross-sectional area that is not narrower than the inner diameter of the soot tube 14b. For this reason, even if the guide part 21 extends and the pipe joint 10 is narrowed, a drainage channel can be secured.

  Thereby, the drainage from the plurality of combined drainage channels b flowing into the inside of the pipe joint 10 of the present embodiment from the plurality of trough pipes 14b is extended from each trough pipe connection portion 22b to the extension of each trough pipe connection portion 22b. It is guided to each guide portion 21 that is positioned and covers the inner wall surface 10b, and flows down the flow path that is made up of each guide portion 21 (see arrows in FIG. 4). That is, the drainage flowing from the junction of the junction drainage channel b can be guided by the guide portion 21, more specifically, at least both side wall portions of the guide portion 21, and further includes the inner wall surface 10 b and the guide portion 21. For example, even if the drainage flowing down the closed space exhibits a behavior of jumping away from the inner wall surface 10b, at least a portion where the guide portion 21 extends does not jump out of the guide portion 21. Therefore, it is possible to suppress the drainage from jumping toward the joint central portion that is the radial direction of the pipe joint 10, and to prevent the drainage arch (film) from being formed inside the pipe joint 10.

  For this reason, when the drainage flows through the inner wall surface 10b where the guide portion 21 is not provided by the pipe joint 10 provided with the guide portion 21 of the present embodiment, adjacent drainage water flowing down the inner wall surface 10b is fan-shaped. A situation where the overlapping and overlapping states hardly occur, and a portion that behaves away from the inner wall surface 10b and protrudes toward the center of the joint in the radial direction of the pipe joint 10 can be suppressed. The drainage that flows through can be made to flow smoothly.

Moreover, in this embodiment, the guide part 21 is formed along the inner wall surface 10b with a fixed height from the inner wall surface 10b so that the drainage which flows down may be included. The guide portion 21 of the present embodiment has substantially the same height h2 from the inner wall surface 10b from the upper end portion of the guide portion 21 communicating with the opening of the soot tube connection portion 22b toward the flow channel downstream end 21a (see FIG. 4). It protrudes and extends.
As for the guide part 21 of the pipe joint 10 of this embodiment, it is preferable that the height h2 from the inner wall surface 10b is more than the diameter of the soot pipe connection part 22b. In this case, it is possible to suppress the behavior of jumping out from the inner wall surface 20a toward the joint central portion that is the radial direction of the pipe joint 20.

  For this reason, the drainage flowing down the flow path composed of the guide portion 21 covering the inner wall surface 10b passes through a tunnel-shaped space having a constant cross-sectional area formed by the inner wall surface 10b and the guide portion 21, and the guide covering the inner wall surface 10b. It can suppress as much as possible that the waste_water | drain which flows through the flow path which consists of the part 21 shows the behavior which spreads out on the inner wall surface 10b toward the joint center part while fan-shaped.

  Thereby, even if the wastewater which flows into the pipe joint 10 from the confluence | merging drainage channel b is vigorous at high speed and is abundant, the several wastewater which flows along the inner wall surface 10b spreads in a fan shape, and overlaps. Can be suppressed. In particular, when the merging drainage channel b forms a siphon drainage flow path that generates a suction force due to the siphon force, the drainage is vigorous and the drainage easily jumps out inside the pipe joint 10. Since the drainage channel in the drainage stack 11 or the pipe joint 10 is easily closed, the pipe joint 10 provided with the guide portion 21 covering the inner wall surface 10b on the inner wall surface 10b of the joint body 10a of this embodiment is a pipe joint. 10 is effective for preventing the drainage from jumping out toward the center of the joint and avoiding the blockage of the drainage channel in the drainage stack 11 or the pipe joint 10.

  In siphon drainage, since drainage is performed using siphon force, the flow rate of drainage flowing into the pipe joint 10 from the vertical pipe connection portion 22b is fast, and a large amount of drainage may flow into the pipe joint 10 in a short time. In such a case, there is a concern that the drainage does not flow smoothly through the drainage stack 11 on the downstream side of the pipe joint 10 or the drainage flow path in the pipe joint 10.

  The guide part 21 covering the inner wall surface 10b of the joint body 10a of the pipe joint 10 of the present embodiment is connected to the drainage stack 11 that is a downstream drainage pipe whose downstream end 21a is connected to the downstream side of the drainage channel. The connection part may be reached. That is, in the present embodiment, the pipe joint 10 provided with the guide portion 21 has a lower end portion on the downstream side connection portion 16 side which is gradually narrowed from the middle in the flow path direction and becomes narrower. The guide portion 21 that covers the inner wall surface 10b extends to a portion that is formed in a cylindrical shape that is substantially flush with the inner diameter of the drainage stack 11 and that has substantially the same inner diameter as the drainage stack 11. You may do it.

  In this case, the drainage that has flowed into the pipe joint 10 from the culvert pipe 14b is formed by the inner wall surface 10b and the guide part 21 up to the lower end of the pipe joint 10 that is a connection part with the drainage stack 11 that is the downstream drainage pipe. It will flow down the flow path which consists of tunnel-shaped space, and generation | occurrence | production of the obstruction | occlusion of the drainage flow path in the drainage stack 11 or the pipe joint 10 is suppressed more. However, if the guide portion 21 is too long, the guide portions 21 cannot interfere with each other and cannot be formed. Therefore, a length of about 1/3 upstream of the inner wall surface 10b is preferable.

  In addition, the guide part 21 of the pipe joint 10 of the present embodiment is not covered with the inner wall surface 10b, for example, by a vertical wall rising from the inner wall surface 10b on the side of the drainage flowing from the junction, that is, from the inner wall surface 10b. You may form so that it may have only the both side wall part to stand up. Also in this case, the drainage that has flowed from the merging outlet of the merging drainage channel b can be guided by the guide portion 21 composed of the vertical walls (both side wall portions), and the drainage is sandwiched between the guide portions 21, that is, the both side wall portions. In addition, since it flows through the flow path on the inner wall surface 10b, it is possible to prevent as much as possible the drainage water from the plurality of combined drainage channels b flowing into the pipe joint 10 from interfering with each other. It becomes difficult to occur.

Furthermore, you may form the guide part 21 so that it may have only one side wall part rising from the inner wall surface 10b. The one side wall portion of the guide portion 21 is partitioned by the one side wall portion so as to be positioned on the same side in the circumferential direction of the inner wall surface 10b, or adjacent to the flow channel. You may arrange | position so that it may locate in between. Even in this case, even if drainage overflows from the side where the one side wall portion of the guide portion 21 is not provided, the overflowing drainage is blocked by the one side wall portion of the adjacent guide portion 21, so It is possible to prevent interference with the flow path to be as much as possible, and it becomes difficult to generate a situation where the fan spreads and overlaps.
(Second Embodiment)

  As shown in FIGS. 5 and 6, the pipe joint 20 according to the second embodiment of the present invention is connected to a drainage stack (drainage pipe) 11 that forms a drainage channel a and joins the drainage channel a. The junction outlet of the junction drainage channel b is provided, and the junction wall (between the inner wall surfaces 20b of the joint main body 20a (for example, five pieces) covers the inner wall surface 20b serving as the bottom surface of each of the guide portions 21. A groove 12 serving as a flow path for drainage flowing in from the soot tube connection part 22b) is provided. That is, the pipe joint 20 of the present embodiment is provided with a groove 12 in each guide part 21 in addition to the plurality of (for example, five) guide parts 21 of the pipe joint 10 of the first embodiment. Other configurations are substantially the same as the pipe joint 10 (see FIGS. 1 and 2) of the first embodiment.

  Hereinafter, the configuration of the groove 12 will be mainly described. In addition, in FIG. 3, it replaces with the pipe joint 10 of the said 1st Embodiment, and the pipe joint 20 which concerns on this embodiment is arrange | positioned. 5 and 6, the same components as those of the pipe joint 10 (see FIGS. 1 and 2) of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG.5 and FIG.6, in the pipe joint 20 of this embodiment, the groove part 12 is provided extending from the upstream side to the downstream side along the inner wall surface 20b. The groove portion 12 has at least the inner peripheral surface of the groove portion 12 at the side of the pipe connection portion so that the pipe 14b is directly extended inside the pipe joint 20 via the pipe connection portion 22b of the upstream side connection portion 22. It is formed continuously with the inner peripheral surface of 22b (see FIG. 5) and has a structure in which drainage easily flows into the groove portion 12, and the cross-section in the depth direction bisects the cross section of the dredging pipe 14b at a substantially diameter position. It has a substantially semicircular shape (see FIG. 6).

  In this embodiment, the groove part 12 provided in the inner wall surface 20b of the pipe joint 20 is a drainage stand pipe whose downstream end 12a is a downstream drain pipe connected to the downstream side of the joint body 20a of the pipe joint 20. 11 connections may be reached (see FIGS. 5 and 6). In the pipe joint 20 provided with the groove portion 12 of the present embodiment, the lower end portion on the downstream side connection portion 16 side is gradually narrowed from the middle in the flow path direction toward the downstream side and becomes narrower. The groove portion 12 extends to a connection portion which is a portion, that is, a portion formed in a cylindrical shape having an inner diameter substantially the same as the outer diameter of the drainage stack 11.

  Moreover, in this embodiment, the flow-path downstream end 12a of the groove part 12 may be a tapered shape. The groove portion 12 of the present embodiment has substantially the same groove width from the upper end portion of the groove portion 12 communicating with the opening of the soot tube connection portion 22b toward the flow channel downstream end 12a to the vicinity of the flow channel downstream end 12a. Through the tapered shape that gradually narrows from the vicinity of the downstream end 12a of the flow path and becomes shallower in depth, it is substantially the same as the lower end of the pipe joint 20 on the downstream connection portion 16 side, that is, the outer diameter of the drainage stack 11. In the vicinity of the connecting portion, which is a cylindrical portion having an inner diameter, it is substantially integrated with the inner wall surface 20b.

  The groove portion 12 of the pipe joint 20 according to the present embodiment has a depth (maximum depth) h1 (see FIG. 6) from the inner wall surface 20b at the merging port, that is, the merging channel of the merging drainage channel b where the drainage channel a is merged. It is preferably 50 to 100% of the diameter (inner diameter) of the soot tube connecting portion 22b, and if the depth from the inner wall surface 20b is 50% or more, the radial direction of the pipe joint 20 moves away from the inner wall surface 20b. The behavior of jumping out toward the center of the joint can be suppressed. Therefore, in this case, a sufficient depth of the groove 12 can be ensured without increasing the thickness of the joint body of the pipe joint 10.

In the present embodiment, the outer wall surface of the pipe body, which is the joint body of the pipe joint 20, is projected outward at the position where the groove section 12 is formed, but the groove section 12 is formed within the thickness of the pipe body. By doing so, the outer wall surface of the tubular body may be circular with a smooth cross-sectional view.
In the pipe joint 20 of this embodiment, the guide part 21 is provided so that at least one part of the extension direction of the groove part 12 may be covered.
The drainage from the plurality of combined drainage channels b flowing into the pipe joint 20 from the plurality of vertical pipes 14b by the pipe joint 20 of the present embodiment communicates from the vertical pipe connection portions 22b to the vertical pipe connection portions 22b. The guide portion 21 is guided to the groove portion 12 which becomes the bottom surface of the guide portion 21 along the guide portion 21 and flows down in the guide portion 21 (see arrows in FIG. 6).

  For this reason, the drainage flowing down the flow path composed of the guide portion 21 covering the groove portion 12 provided on the inner wall surface 20b passes through a tunnel-shaped space having a constant cross-sectional area formed by the groove portion 12 and the guide portion 21. It is possible to more effectively suppress the drainage flowing through the flow path formed of the guide portion 21 covering 12 from spreading out in a fan shape on the inner wall surface 20b and jumping out toward the joint central portion.

  In addition, in this embodiment, it is effective when the confluence | merging drainage channel b forms the flow path of the siphon drainage which generate | occur | produces the attraction | suction force by a siphon force, and the both side wall part which the guide part 21 stands | starts up from the inner wall surface 10b As in the case of the pipe joint 10 of the first embodiment, each of the pipe joints 10 may be formed so as to have only a single side wall portion rising from the inner wall surface 10b.

  10, 20: Pipe joint, 10a, 20a: Joint body, 10b, 20b: Inner wall surface, 11: Drainage pipe (drainage pipe), 12: Groove, 12a, 21a: Downstream end of flow path, 13: Watering device, 14: Combined drain pipe, 14a: Horizontal pipe, 14b: Saddle pipe, 16: Downstream side connection part, 21: Guide part, 22: Upstream side connection part, 22a: Stand pipe connection part, 22b: Saddle pipe connection part ( A: drainage channel, b: merged drainage channel, h1: depth, h2: height, s: floor slab.

Claims (4)

A pipe joint that is connected to a drain pipe that forms a drainage channel, and that is provided with a junction of a merged drainage channel that merges with the drainage channel,
A pipe joint characterized in that a guide portion for guiding drainage flowing from the junction is provided on the inner wall surface of the joint body.   The pipe joint according to claim 1, wherein the guide portion covers the inner wall surface so as to enclose drainage that has flowed in from the junction.   The pipe joint according to claim 1, wherein the guide portion is formed by a vertical wall that rises from the inner wall surface at a side of drainage that has flowed from the junction.   The said joint drainage channel is a pipe joint as described in any one of Claim 1 to 3 which forms the flow path which produces | generates the attraction | suction force by a siphon force.

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