JP6121107B2 - Leg joint - Google Patents

Description

  The present invention relates to a leg joint used in a drainage pipe facility for a building having a plurality of layers.

  In drainage pipe facilities of buildings with multiple layers such as high-rise apartments, drainage of each layer is caused to flow together in a drainage standpipe system piped through each layer, and piped horizontally under the bottom floor slab. Lead to the outside with a horizontal drain main pipe. Therefore, in order to connect the lower end portion of the drainage standpipe system to the upstream end portion of the drainage horizontal main pipe, a leg joint bent in an arc shape from the vertical direction to the horizontal direction is used. In such a drain pipe facility, in general, the drainage flowing down the drainage stand system is prevented from blocking the drainage horizontal main pipe by causing a sudden change of direction in the leg joint and jumping. A drainage horizontal main pipe with a large diameter is piped.

  By the way, when the space below the bottom floor slab is narrow or the drainage horizontal main pipe is long, etc., in order to ensure the slope of the drainage horizontal main pipe, in the limited space under the floor slab, The upstream end must be piped as high as possible. For this reason, there is a need for a leg joint that is compact in the vertical direction that can connect the drainage horizontal main pipe at a higher position. As a leg joint for the purpose of downsizing in the vertical direction, for example, there is a leg joint of Patent Document 1. As shown in FIG. 11, the leg joint 101 of Patent Document 1 includes a curved pipe portion 103 that is bent 90 ° in an arc shape while expanding the diameter. The smaller-diameter end portion 105 of the bent tube portion 103 includes a receiving port 105u formed integrally, and a drainage stack 111 having the same diameter as that of the end portion 105 is inserted into the receiving port 105u so as to be connected coaxially. The On the other hand, a drainage horizontal main pipe 113 having the same diameter as that of the end 107 and a diameter larger than that of the drainage stack 111 is coaxially connected to the end 107 having a larger diameter. In this type of leg joint 101, if the bent portion 103 is gently bent, the drainage flowing down along the inner wall of the drainage stack 111 flows along the inner wall of the bent tube portion 103. However, if the curved pipe portion 103 is suddenly bent to make it compact in the vertical direction, the drainage that has flowed down flows along the inner wall at the arcuate outer position of the curved pipe portion 103 (FIGS. 11 and 11). 12 (see drainage flows W1 and W2 schematically shown in FIG. 12), inside the arc shape, it cannot follow the sharp curve of its inner wall and falls away from the inner wall to form a curtain-like water film Wf (FIG. 11) As a result, a problem of blocking the inside of the bent tube portion 103 occurs. Therefore, in the leg joint 101 of Patent Document 1, a blade-like rib 109 is projected on the inner wall surface inside the arc shape of the curved pipe portion 103, and the water film Wf is dropped along the falling direction by the blade-like rib 109. By branching and forming a passage for air, blockage of the bent tube portion 103 by the water film Wf is prevented. However, when the projections such as the blade-like ribs 109 are integrally formed on the curved pipe portion 103, the internal shape of the pipe becomes complicated and it is difficult to manufacture.

  On the other hand, Patent Document 2 discloses a technique in which an adapter is attached to an end portion of a leg joint body having no protrusion on the side to which the drainage stand pipe is connected, and the stand pipe receiving port and the protrusion are retrofitted. . According to such a technique, the drainage flowing down the drainage stack can be branched by the protrusions while the internal shape of the leg joint body is simple. In Patent Document 2, the leg joint main body is formed in an arc shape with a uniform pipe diameter throughout the whole in accordance with the pipe diameter of the drainage horizontal main pipe having a larger diameter, and has a simple shape. Therefore, the end on the side where the drainage stack is connected has a larger diameter than the drainage stack. By attaching an adapter to this end, a small-diameter receiving port for connecting the drainage standpipe is provided at a position outward as viewed in the arc shape of the leg joint, and the protrusion is a circle. Arranged in an arcuate position.

JP 2009-144480 A JP 2002-201689 A

  However, the leg joint of Patent Document 2 can simplify the shape of the leg joint main body, but requires a separate adapter, which increases the number of parts. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize a leg joint that has a simpler shape and has a smaller number of parts even if it is compact in the vertical direction and the pipe is not easily blocked by drainage.

In order to solve the above problems, the present invention employs the following means.
The present invention provides a drainage pipe facility for a building having a plurality of layers, the lower end part of a drainage standpipe system piped through each layer, and the drainage standpipe laterally piped under the floor slab of the lowermost layer It is a leg joint that connects the upstream end of the drainage horizontal main pipe having a larger diameter than the system , and guides the drainage flowing down while turning along the inner wall of the drainage standpipe system. A body having an arcuate bend, and the inner diameter of the body is the same from the end on the drainage stack system side to the end on the drainage horizontal main pipe side, and the inner diameter Is larger than the inner diameter of the drainage standpipe system and is the same as the inner diameter of the drainage horizontal main pipe, and the end of the trunk on the drainage horizontal main pipe side is coaxially connected to the drainage horizontal main pipe And the end of the trunk portion on the drainage stand system side of the bent portion is An upper receiving port that is an arcuate end position and into which the lower end of the drainage stand system is inserted is directly and integrally formed, and the end of the trunk on the drainage stand system side and the upper receiving port The axial relationship of the upper receptacle is an outward position as seen in the arc shape of the bent portion with respect to the axial center of the end portion on the drainage stand system side, and is inserted into the upper receptacle. It is a position where a gap is formed over the entire circumference between the extension line of the inner wall of the lower end portion of the drainage stack system and the inner wall of the trunk portion, and further inserted into the back portion of the upper receiving port from above. And a receiving portion for restricting the lower end portion of the drainage stand system from entering further, and the receiving portion is flush with a horizontal plane of an end portion of the trunk portion on the drainage stand system side. provided, to flow down while swirling the drainage system The drainage flow, characterized in that protrudes in the tube side so as not to interfere.

  According to the leg joint of the present invention, the inner diameter of the trunk is the same from the end on the drainage stand system side to the end on the drainage horizontal main pipe side, and the inner diameter is the same as the inner diameter of the drainage horizontal main pipe It is said that. Therefore, the end of the trunk on the drainage stand system side has a larger diameter than the drainage stand system. An upper receiving port into which the lower end portion of the drainage stack system is inserted is integrally formed at the end of the trunk portion having a diameter larger than that of the drainage stack system. The upper receptacle is arranged so that a gap is formed over the entire circumference between the extension line of the inner wall of the lower end portion of the drainage stack inserted into the upper receptacle and the inner wall of the trunk portion. It is provided directly and continuously with the end. Here, being directly continuous means that the upper receptacle and the end portion of the body portion are arranged side by side in the axial direction without a tapered shape or the like that gradually increases in diameter. Therefore, a step is formed over the entire circumference between the inner wall of the lower end portion of the drainage stack system and the inner wall of the trunk section, and the drainage flowing down while forming a tubular flow along the inner wall of the drainage stack system. At least when flowing into the trunk, the entire circumference falls away from the inner wall of the trunk. From another point of view, when drainage flows down from the drainage stand system to the trunk of the leg joint, an air layer is formed around the drainage flow that flows at least near the end of the trunk on the drainage stand system side. Is formed. At this time, the drainage stream tries to form a water film all around, but the water film is not formed with a uniform thickness. Natural cuts occur in sparse parts of the film. As a result, air can be transferred to and from the surrounding air layer through the cut of the water film, and the pipe can be prevented from being blocked by the drainage flow. As described above, the leg joint of the present invention has an upper receiving port integrally formed on a body portion having a uniform diameter, has a simple shape and a small number of parts, and does not have a protrusion. It is possible to prevent the pipe from being blocked by the drainage flow.

  Furthermore, in the leg joint of the present invention, the end of the trunk portion on the drainage stand system side is the arcuate end position of the bent portion, and it is easy to make it compact in the vertical direction. Even if the curvature of the bent part is reduced to make it compact in the vertical direction, the axis of the upper receptacle is biased to the outward position as seen by the arc shape of the bent part from the axis of the end on the drainage stack system side. Therefore, the drainage can be dropped at a position where the inclination of the bent portion with respect to the drainage horizontal main pipe is large and propelled in the lateral direction.

  According to the present invention, there is no need for separate parts to provide the upper receptacle into which the lower end of the drainage stack system is inserted, and the drainage can be reduced in the vertical direction with a small number of parts and a simpler shape. Thus, it is possible to configure a leg joint where the pipe is not easily blocked.

It is a side view of the drain pipe equipment which shows the example of piping of the leg joint of Embodiment 1 of the present invention. It is a perspective view of the leg joint of Embodiment 1 of the present invention. FIG. 3 is a front view of the leg joint shown in FIG. 2. FIG. 3 is a side view of the leg joint shown in FIG. 2. FIG. 3 is a rear view of the leg joint shown in FIG. 2. FIG. 3 is a plan view of the leg joint shown in FIG. 2. (A) is VII-VII sectional drawing of the drain pipe equipment shown by FIG. 1, (B) is a figure which shows typically the flow of waste_water | drain and the flow of air in sectional drawing of (A). (A) is VIII-VIII sectional drawing of the drain pipe installation shown by FIG. 7, (B) is a figure which shows typically the flow of waste_water | drain in sectional drawing of (A). It is IX-IX sectional drawing of the drain pipe equipment shown by FIG. 1, and is a figure which shows typically the flow of waste_water | drain. It is a figure which shows the example of a change of the drain pipe installation shown by FIG. It is sectional drawing shown in the state which piped the conventional leg joint to the drainage pipe installation. It is XII-XII sectional drawing of the leg joint shown by FIG.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a piping portion of the leg joint 21 of the present embodiment in the drain pipe facility H1. This drain pipe equipment H1 is a drain pipe equipment for a building having a plurality of layers. The drainage pipe facility H1 includes a drainage stand system 11 piped through each layer of the building, and a drainage horizontal main pipe 19 piped laterally under the floor slab S of the lowermost layer A. A lower end 17 of the system 11 and an upstream end 19 a of the drainage horizontal main pipe 19 are connected via a leg joint 21.

  The drainage stand system 11 includes a drainage standpipe 13 piped to each layer and a standpipe joint 15 piped through the floor slab S separating each layer. The vertical pipe joint 15 has a horizontal branch pipe opening 15a around the trunk, and a drainage horizontal branch pipe (not shown) that guides drainage from a drainage device (not shown) in the lateral direction is connected to the upper side of the floor slab S. . The vertical pipe joint 15 has a trunk portion 15b provided with a horizontal branch pipe receiving port 15a having a diameter larger than that of the drainage vertical pipe 13, and a drainage vertical pipe 13 on the lower floor via a tapered pipe part 15c that decreases in diameter downward. A straight straight lower pipe portion 15d is provided. Further, a guide (not shown) capable of turning the drained water flowing down is provided on the inner wall of the vertical pipe joint 15. For this reason, the drainage stack system 11 can join the drainage from the drainage appliances of the respective layers and swirl the drainage along the inner wall of the pipe to form an air core on the pipe shaft. The drainage stack system 11 is configured to join the drainage of the lowermost layer A with the drainage of the upper floor, and a standing pipe joint 15 is piped through the floor slab S of the lowermost layer A. A lower straight pipe portion 15 d of the vertical pipe joint 15 is connected to the leg joint 21 under the floor slab S, and is connected to the drainage horizontal main pipe 19 through the leg joint 21.

  The drainage horizontal main pipe 19 is larger in diameter than the drainage standpipe system 11 (drainage standpipe 13), and is provided with a gradient that allows the drainage to flow in the lateral direction, and is placed under the floor slab S of the lowermost layer A. Piped in the direction to guide the drainage out of the building.

  The leg joint 21 includes a trunk portion 23 having a bent portion 25. The bent portion 25 forms a drainage flow path bent 90 degrees in an arc shape, and the vertical flow of the drainage flowing down the drainage stack 11 can be changed in the horizontal direction. In the trunk portion 23, the arcuate end position of the bent portion 25 on the drainage stand system 11 side also constitutes an end portion 27 of the trunk portion 23 on the drainage stand system 11 side. On the other hand, a straight pipe portion 29 is extended on the side of the drainage horizontal main pipe 19 of the bent portion 25, and the end position of the straight pipe portion 29 constitutes an end portion 31 of the trunk portion 23 on the side of the drainage horizontal main pipe 19. . In addition, cleaning openings 26 and 26 with lids are provided on both sides of the bent portion 25.

  The inner diameter of the trunk portion 23 is uniform from the end portion 27 on the drainage stack system 11 side to the end portion 31 on the drainage horizontal main pipe 19 side, and the inner diameter is the same as the inner diameter of the drainage horizontal main pipe 19. A lateral main pipe connecting portion 33 is provided at the end 31 on the side of the drainage horizontal main pipe 19 so that the trunk portion 23 and the drainage horizontal main pipe 19 are connected coaxially. In the present embodiment, the horizontal main pipe connecting portion 33 takes a so-called mechanical connection form. That is, the horizontal main pipe connecting portion 33 includes a horizontal main pipe receiving port 35 having a flange portion 37 integrally with the body portion 23, and connects the ring-shaped pressing flange portion 39, the annular seal member 41, and both flange portions 37, 39. Bolts and nuts 38 are provided. According to the horizontal main pipe connecting portion 33, the annular seal member 41 and the pressing flange portion 39 are fitted on the upstream end 19 a of the drainage horizontal main pipe 19, and the annular seal member 41 is interposed between the flange portions 37 and 39. With the bolts and nuts 38 tightened and the flange portions 37 and 39 approaching each other, the annular seal member 41 is deformed radially inward and pressed against the outer peripheral surface of the drainage horizontal main pipe 19. The leg joint 21 and the drainage horizontal main pipe 19 are connected in a watertight manner.

  On the other hand, the end portion 27 on the drainage standpipe system 11 side of the trunk portion 23 has a larger diameter than the drainage standpipe system 11, and the lower end 17 of the drainage standpipe system 11 (the lower straight pipe portion 15 d of the standpipe joint 15). The upper receiving port 43 having a diameter smaller than that of the end 27 is integrally formed directly and continuously in the axial direction without interposing a tapered portion or a straight tubular portion therebetween. In addition, in the end part 27 by the side of the drainage stack system 11 of the trunk | drum 23, except the part in which the upper receptacle 43 is formed, it is closed by the horizontal surface 27a.

  As shown in FIG. 8 (A) and the like, the upper receiving port 43 has a cylindrical shape whose inner diameter is slightly larger than the outer diameter of the lower end portion 17 of the drainage stack system 11, The receiving part 45 which can control that the lower end part 17 of the drainage stack system 11 inserted from no more enters is formed. The receiving portion 45 does not allow the passage of the lower end portion 17 of the drainage stack system 11, but protrudes inward of the pipe so as not to interfere with the drainage flow flowing down the drainage stack system 11. An elastic body 47 having a rectangular cross section is placed on the receiving portion 45. Similarly to the receiving portion 45, the elastic body 47 does not allow passage of the lower end portion 17 of the drainage stack system 11, but does not interfere with the drainage flow flowing down the drainage stack system 11. The lower end portion 17 of the drainage stack system 11 is inserted and connected to the upper receiving port 43 in a state where it hits the receiving portion 45 via the elastic body 47. A groove 43m is formed along the circumferential direction on the inner peripheral surface of the upper receiving port 43 near the opening into which the lower end 17 of the drainage stack system 11 is inserted. In this groove 43m, an O-ring 49 is fitted and held so as to protrude inward of the pipe, and comes into contact with the outer peripheral surface of the lower end portion 17 of the drainage standpipe system 11 so that the drainage standpipe system 11 and the leg are connected. The joint 21 is watertightly connected.

  The upper receptacle 43 is formed such that a gap G is formed over the entire circumference between the extension line B of the inner wall of the lower end 17 of the drainage stack 11 inserted into the upper receptacle 43 and the inner wall of the trunk portion 23. The bent portion 25 is arranged at an outward position as seen in the arc shape. That is, the axis C1 of the upper receiving port 43 is shifted to the outward position as seen in the arc shape of the bent portion 25 with respect to the axis C2 of the trunk portion 23, but the lower end portion 17 of the drainage stack system 11 is disposed. An extension line B of the inner wall is formed so as not to coincide with the arcuate outer wall 23a of the body portion 23 and to be disposed at an inner position of the pipe.

  As shown in FIG. 1, the leg joint 21 is supported by a support 61 in a state of being suspended from the floor slab S of the lowermost layer A. For this purpose, the body portion 23 is provided with a support protrusion 51 on the outer wall of the bent portion 25 that extends downward to a position that coincides with the axial center of the drainage stack 11. The support protrusion 51 includes a pedestal portion 53 that forms a downward horizontal surface at the base, and an insertion portion 55 having a cross-shaped cross section orthogonal to the axial direction extends downward from the horizontal surface of the pedestal portion 53. The support 61 has a support plate 63 that is long in a direction orthogonal to the paper surface as viewed in FIG. 1 and a rod-like suspension that supports both ends of the support plate 63 in the longitudinal direction on the floor slab S. A pair of members 65 is provided. In the center of the upper surface of the support plate 63, a cylindrical support cylinder portion 63 a is provided coaxially with the support protrusion 51. A thick bottomed cylindrical antivibration rubber 67 is accommodated inside the support cylinder 63a. The leg joint 21 is placed on the support plate 63 in a state where the insertion part 55 of the leg joint 21 is inserted into the vibration isolating rubber 67. As described above, according to the support structure in which the drainage stack system 11 is directly supported via the vibration isolating rubber 67, the vibration generated by the drainage flowing down the drainage stack system 11 colliding with the leg joint 21 is obtained. The vibration proof rubber 67 can efficiently absorb the vibration, and the propagation of vibration to the floor slab S can be reduced.

Next, the function when drainage flows into the leg joint 21 will be described with reference to FIGS. 7B, 8B, and 9. FIG. In these sectional views, the flowing waste water W is also shown as being cut, and the flow of the waste water W is schematically shown.
As shown in FIG. 9, the waste water W flowing down the drainage stack system 11 travels along the inner wall of the drainage stack system 11 and forms a tubular flow while forming an air core AC on the tube axis. And as shown in Drawing 7 (B) and Drawing 8 (B), the inner wall of lower end part 17 of drainage stack system 11 and the inner wall of trunk part 23 (bending part 25) of leg joint 21 are the following. Since the steps are arranged around the entire circumference, the waste water W flowing down while forming a tubular flow along the inner wall of the drainage stack system 11 flows into the body portion 23 of the leg joint 21. When doing so, the entire circumference falls away from the body portion 23 while forming the water film Wf. At that time, the drainage W is suddenly released from the tip of the lower end portion 17 of the drainage stack 11 and falls while spreading. At this time, the drainage W can form the water film Wf over the entire circumference of the tubular flow, but since the formation range of the water film Wf is wide, a break R is generated in a sparse part of the water film Wf. Here, an air layer AL is formed around the water film Wf between the inner wall of the trunk portion 23 over the entire circumference, and air flows from the break R regardless of the position where the break R is formed. Can do. Therefore, a ventilation band communicating in the vertical direction and the horizontal direction is formed inside the leg joint 21, and the pipe is prevented from being blocked by the drainage W. In each figure, the air flow at that time is schematically shown by white arrows. The air on the drainage horizontal main pipe 19 (not shown) side escapes to the air core AC formed in the drainage stack system 11 against the flow of the drainage W, thereby suppressing rapid pressure fluctuation in the leg joint 21. Is done. As shown in FIG. 8 (B), the drainage stack system 11 is connected to the outer portion of the trunk portion 23 as viewed in the arc shape of the bent portion 25, and therefore the bent portion 25. In the outer position as seen in the arc shape, the drainage W eventually flows along the curve of the arc diameter. Thereby, drainage can be propelled laterally and can flow smoothly.

  According to such a leg joint 21, the pipeline is not easily blocked by the drainage regardless of the magnitude of the arcuate curvature of the bent portion 25. Therefore, it is possible to make the leg joint 21 compact in the vertical direction by reducing the arc-shaped curvature of the bent portion 25.

(Other embodiments)
The leg joint of the present invention is not limited to the above embodiment, and various other modifications can be considered. For example, the configuration of the horizontal main pipe connecting portion 33 is formed in a straight tubular shape in the body portion 23, and the straight tubular portion is inserted into a receiving port provided in the upstream end 19a of the drainage horizontal main pipe 19, It is good also as a structure connected mechanically. Moreover, what is necessary is just to provide the cleaning opening 26 as needed.

  Further, in the pipe of the leg joint 21, when the lower end portion of the vertical joint 15 is not a straight tube and cannot be directly connected to the upper receiving port 43 of the leg joint 21, as shown in FIG. 10, the vertical pipe 15 What is necessary is just to connect the short drainage stack 71 to the lower receiving end, and insert this short drainage stack 71 into the upper receiving port 43 of the leg joint 21 for connection. In FIG. 10, a short drainage standpipe 71 is connected to the lower end portion of the standpipe joint 15 via a mechanical connection structure 15e, and a pipe example in which the short drainage standpipe 71 is connected to the leg joint 21 is shown. Has been.

11 Drainage pipe system 19 Drainage horizontal main pipe 21 Leg joint 23 Trunk part 25 Bending part 43 Upper receptacle B Extension line B of the inner wall of the lower end part of the drainage pipe system
G Gap W Drainage Wf Water film R (Water film) cut

Claims (1)

In a drainage pipe facility of a building having multiple layers, it is larger than the lower end part of the drainage standpipe system piped through each layer and the drainage standpipe system piped laterally under the floor slab of the lowest layer. A leg joint connecting the upstream end of the drainage horizontal main pipe with a diameter,
A trunk having an arc-shaped bent portion capable of guiding the drainage flowing down while turning along the inner wall of the drainage stand system;
The inner diameter of the trunk is the same from the end on the drainage stand system side to the end on the drainage horizontal main pipe side, and the inner diameter is larger than the inner diameter of the drainage standpipe system, and the drainage horizontal main pipe Is the same as the inner diameter of
The end of the trunk portion on the side of the drainage horizontal main pipe is connected to the drainage horizontal main pipe coaxially,
An end of the trunk portion on the drainage stand system side is an arcuate end position of the bent portion, and an upper receiving port into which a lower end of the drainage stand system is inserted is directly and integrally formed. And
The positional relationship between the end of the trunk portion on the drainage stand system side and the upper receiving port is such that the axis of the upper receiving port has an arc shape of the bent portion from the axis of the end on the drainage stand system side. And a position where a gap is formed over the entire circumference between the extension line of the inner wall of the lower end portion of the drainage stack inserted into the upper receptacle and the inner wall of the trunk portion. And
Furthermore, at the back of the upper receiving port, a receiving part that restricts the lower end of the drainage stack inserted from above from entering further is formed,
The receiving portion is provided on the same plane as the horizontal surface of the end portion of the trunk portion on the drainage stand system side, so that it does not interfere with the drainage flow flowing down while turning the drainage stand system. A leg joint characterized by overhanging.

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