JP2015086612A - Leg bend pipe, and drain piping structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg bend pipe that maintains draining performance without providing any rib etc., in piping, and has its height-directional size suppressed.SOLUTION: A leg bend pipe 100 includes: an upper pipe connection part 110 which is connected to a drain riser pipe penetrating a floor slab of the lowest floor; a horizontal main pipe connection part 120 which is connected to a horizontal main pipe; and a bent part 130 which connects the upper pipe connection part 110 and the horizontal main pipe connection part 120 together by making direction change so that the pipe axis direction of the upper pipe connection part 110 and the pipe axis direction of the horizontal main pipe connection part 120 are orthogonal to each other. At the bent part 130, the bending center line connecting the pipe axis center of the upper pipe connection part 110 and the pipe axis center of the horizontal main pipe connection part 120 forms an arcuate shape of less than 90 degrees.

Description

  The present invention relates to a leg bend pipe that is a pipe joint used on the lowest floor of a drainage pipe system of a multi-story building, and more particularly to a leg bend pipe that saves space in the height direction. Furthermore, the present invention relates to a drainage pipe structure using such a leg bend pipe.

  Drainage pipe systems used in multi-storey buildings such as condominiums and commercial buildings have a drainage stand installed through each level, and a horizontal main pipe is connected to the lower end of the drainage standpipe via a leg bend pipe. It has a structured. This horizontal main pipe is provided under the floor of the lowest floor of the building (not limited to the first floor of the building, but the lowest floor in the range where it is set up as a drainage stack). The drainage stack is provided with drainage piping members corresponding to each level, and the horizontal branch pipes piped at each level are connected to these individual drainage piping members.

  In such condominiums, entrances, etc. are often provided on the first floor. In such a case, the drainage stand pipe is connected to the horizontal main pipe by a leg bend pipe between the lower floor of the second floor and the ceiling of the first floor. Is done. In an apartment, there is a demand for a higher ceiling height on the first floor in order to improve the appearance such as a feeling of opening at the entrance. In order to realize such a demand, a leg bend pipe having a smaller dimension in the height direction than before is required.

  Japanese Patent Laying-Open No. 2009-144480 (Patent Document 1) discloses a leg joint in which the bending of the bent pipe portion is abruptly made to reduce the dimension in the height direction. The leg joint connects the lower main pipe lower end and the horizontal main pipe of the drainage channel at the lowermost floor of the multi-story building, and is connected to the vertical main pipe connecting to the lower main pipe lower end and the horizontal main pipe. A leg joint composed of a horizontal main pipe connecting pipe part and a curved pipe part connecting the vertical pipe connecting pipe part and the horizontal main pipe connecting pipe part, with a central axis of the horizontal main pipe connecting pipe part sandwiched therebetween A pair of blade-like ribs projecting into the vertical pipe connection pipe portion apart from each other are provided on the inner wall surface on the side of the horizontal main pipe connection pipe portion from the vertical pipe connection pipe portion center of the vertical pipe connection pipe portion. And According to this leg joint, a part of the drainage that flows down while turning along the wall surface on the side of the horizontal pipe connecting pipe part of the vertical pipe connecting pipe part is restrained from swirling by the blade-like ribs and flows almost vertically. . Therefore, the water film that blocks the inlet of the horizontal pipe connecting pipe section is cut, and the vertical pipe connecting pipe section and the horizontal pipe connecting pipe section are always kept in communication with each other. No pressure is generated. For this reason, a leg joint with a small dimension in the height direction can be provided without causing any trouble in drainage performance.

JP 2009-144480 A

  In the drainage pipe structure, it can be easily understood that the curvature of the curved pipe portion should be increased (the radius of curvature is reduced) in order to suppress the height-wise dimension of the leg bend pipe. However, in this case, even if the height dimension can be suppressed, the flow direction is suddenly changed in the curved pipe portion, so that the flow is disturbed and it is difficult to realize the desired drainage performance. There is a problem of becoming. This problem is a problem to be solved by the invention disclosed in Patent Document 1.

  However, the leg joint disclosed in Patent Document 1 must be provided with a blade-like rib at a predetermined position with a predetermined size and a predetermined strength. For this reason, the manufacturing cost of the leg joint disclosed in Patent Document 1 increases. Furthermore, as disclosed in Patent Document 1, if the allowance of the blade-like rib is too small, the swirl flow cannot be cut off and the water film cannot be cut well, and if too large, impurities in the drainage are caught. There is a risk that the pipeline will be clogged. As described above, when the blade-like rib is provided in the pipe line, it may be difficult to design the pipe so that the drainage performance is not hindered.

  The present invention was developed in view of the above-mentioned problems of the prior art, and its purpose is to maintain the drainage performance without providing ribs or the like in the pipe, and to suppress the height of the legs. It is to provide a bend pipe and a drain pipe structure using the bend pipe.

In order to achieve the above object, the leg bend pipe or drain pipe structure according to the present invention employs the following technical means.
That is, the leg bend pipe according to the present invention includes an upper pipe connection part connected to a drainage standing pipe penetrating the floor slab on the lowest floor, a horizontal main pipe connection part connected to the horizontal main pipe, and the upper pipe connection. A leg bend pipe provided with a bend section that changes the direction so that the pipe axis direction of the section and the pipe axis direction of the horizontal main pipe connection section are orthogonal to each other and connects the upper pipe connection section and the horizontal main pipe connection section. is there. In the bend portion, an arc shape with a central axis of less than 90 degrees is formed, and in the connection portion between the bend portion and the horizontal main pipe connection portion, the central axis direction and the pipe axis direction of the horizontal main pipe connection portion are parallel to each other. It is characterized by becoming.

Preferably, the arcuate shape formed by the central axis may have a central angle in a range of 45 degrees to 65 degrees.
More preferably, the upper pipe joint part may be configured to have a receiving shape and include a rubber ring that is watertightly connected to the drainage stack.
A drainage pipe structure according to another aspect of the present invention is a drainage pipe structure including any one of the above-described leg bend pipes, a drainage pipe joint for the lowermost floor penetrating the floor slab of the lowermost floor, and a horizontal main pipe. It is. The lowermost floor drainage pipe joint includes an upper riser connection part for connecting to the upper drainage standpipe, a lower pipe connection part for connecting to the lower leg bend pipe, and the upper riser connection And a water collecting chamber provided with a lateral branch pipe connection part for draining drainage from the lateral direction into the pipe between the lower pipe connection part and the lower pipe connection part, and the nominal diameter of the lower pipe connection part is the upper part It is larger than the nominal diameter of a vertical pipe connection part, The internal diameter of the said water collection chamber is larger than both the nominal diameter of the said lower pipe connection part, and the nominal diameter of the said upper vertical pipe connection part, It is characterized by the above-mentioned.

  Preferably, the drainage pipe joint for the lowermost floor is configured such that the lower pipe connecting portion is a straight tubular straight and can be connected to the leg bend pipe by cutting to an arbitrary length. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the leg part bend pipe | tube which suppressed the dimension of the height direction which maintained drainage performance, without providing a rib etc. in piping, and the drain piping structure using the same can be provided.

It is a side view of the leg part bend pipe concerning an embodiment of the invention. FIG. 2 is a top view of the leg bend pipe of FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a figure for demonstrating drainage performance, Comprising: (A) is the schematic of the leg bend pipe of FIG. 1, (B) is the leg bend pipe of the same curvature as the leg bend pipe of FIG. FIG. 2C is a schematic view of a leg bend tube having a larger curvature than the leg bend tube of FIG. 1. It is a figure for demonstrating drainage performance, Comprising: (A) is the figure which superimposed FIG. 4 (A) and FIG. 4 (B), (B) is FIG. 4 (A) and FIG. FIG. It is a figure which shows the pressure distribution in the pipe of each floor in a drainage test. It is a figure which shows the 1st drainage piping structure using the leg part bend pipe | tube of FIG. It is a figure which shows the drain piping structure using the conventional leg bend pipe. It is a figure which shows the 2nd drainage piping structure using the leg part bend pipe and drainage pipe coupling of FIG. It is the side view and sectional drawing of the drain pipe joint used for the 3rd drain piping structure. It is a top view of the drain pipe joint of FIG. It is a conceptual diagram of the rectifying ring provided in the drain pipe joint of FIG. It is a figure for demonstrating drainage performance. It is a figure which shows the 3rd drainage piping structure using the leg part bend pipe | tube of FIG. 1, and the drainage pipe coupling of FIG.

[Leg bend pipe]
Hereinafter, a leg bend pipe according to an embodiment of the present invention will be described in detail with reference to the drawings. There are various leg bend pipe structures (for example, the nominal diameter of other pipes to be connected and connection structures with other pipes), and the present invention is not limited to a specific structure. Any leg bend tube having structural features to be described later may be used.

  FIG. 1 is a side view of a leg bend pipe 100 according to an embodiment of the present invention, FIG. 2 is a top view of the leg bend pipe 100, and FIG. 3 is a sectional view taken along line 3-3 of FIG. As shown in these drawings, the leg bend pipe 100 is made of cast iron, for example, and is connected to the upper pipe connection part 110 connected to the drainage standing pipe penetrating the floor slab on the lowest floor, and to the horizontal main pipe. The horizontal main pipe connection portion 120, the pipe axis direction of the upper pipe connection portion 110 and the pipe axis direction of the horizontal main pipe connection portion 120 are changed in direction so that the upper pipe connection portion 110 and the horizontal main pipe connection portion 120 are changed. And a bend portion (curved pipe portion) 130 to be connected.

  Characteristically, in the bend portion 130 of the leg bend tube 100, the tube axis center at the connection portion with the upper tube connection portion 110 and the tube axis center at the connection portion with the horizontal main tube connection portion 120 are connected. The central axis is a point forming an arc shape of less than 90 degrees. In the connection portion between the bend portion 130 and the horizontal main pipe connection portion 120, the central axis direction of the bend portion 130 and the tube axis direction of the horizontal main pipe connection portion are parallel to each other.

  A rubber ring 114 is fitted to the receiving part 112 of the upper pipe connecting part 110 of the leg bend pipe 100 in the same manner as a known rubber ring type receiving part, and the lower end of the drainage stack is in the rubber ring 114. The leg bend pipe 100 and the drainage stack are connected in a watertight manner with a single touch. At this time, the drainage standpipe is installed so that the tube axis of the drainage standpipe is vertical, and the leg bend pipe 100 and the drainage standpipe installed in the vertical direction are the pipe shaft of the upper pipe connection part 110 and the drainage standpipe. Are connected so that their tube axes coincide with each other. An example of the nominal diameter of the drainage stack is 100 mm (4 inches).

  The horizontal main pipe connecting portion 120 includes a flange 122 for connecting the horizontal main pipe at the opening end thereof, and a fastening material such as a bolt is inserted into the flange hole 124 so that the leg bend pipe 100 and the horizontal main pipe are coupled. It has become. At this time, the pipe axis of the horizontal main pipe is installed in a substantially horizontal direction, and the leg bend pipe 100 and the horizontal main pipe installed in the substantially horizontal direction are connected to the pipe axis of the horizontal main pipe connecting portion 120 and the horizontal main pipe. They are connected so that the tube axis coincides. An example of the nominal diameter of the horizontal main pipe is 150 mm (6 inches).

  In this leg bend pipe 100, in order to maintain the drainage performance while suppressing the height, the bend part 130 is not formed as a conventional 90 degree arc, but the upper part of the 90 degree arc is deleted, so that It is characterized in that the drainage performance is maintained by ensuring a slope that promotes the flow into the horizontal main pipe side with respect to the wastewater flowing from the drainage stack. In the following, the structure of the leg bend pipe 100 that exhibits such operational effects will be described in detail.

  As shown in FIG. 3, the bend portion 130 of the leg bend pipe 100 is formed in an arc shape having a center axis R center. The central axis line includes a straight line L (1) connecting the tube axis center (the tube axis center of the bend starting surface) on the upper tube connection part 110 side of the bend part 130 and the R center, and the horizontal main pipe connection part of the bend part 130. It is formed by an arc shape with a central angle α and a curvature radius R (1) formed by a tube axis center on the 120 side (tube axis center of the end surface of the bend) and a straight line L (2) connecting the R center. Yes. The R center may be slightly deviated toward the horizontal main pipe connecting part 120 or the upper pipe connecting part 110.

The central angle α of the arc shape formed by the central axis of the bend portion 130 is preferably in the range of 45 ° to 65 °, and more preferably in the range of 58 ° to 62 °. Thus, the dimension of the height direction of the leg bend pipe | tube 100 can be suppressed by forming the circular arc shape whose center axis line is less than 90 degree | times.
Next, with reference to FIG. 4 and FIG. 5, structural features of the leg bend pipe 100 that affect the drainage performance of the drain pipe structure using the leg bend pipe 100 will be described.

FIG. 4A is a schematic diagram of the leg bend pipe 100 according to the present embodiment, and FIG. 4B is a diagram showing a bend part in which the upper pipe connecting part of the leg bend pipe 100 is disposed at an angle of 90 degrees. FIG. 4C is a schematic diagram of an arc leg bend tube 200, and FIG. 4C is an outline of a leg bend tube 300 having a 90 ° arc bend portion with a larger curvature (smaller radius of curvature) than the leg bend tube 100. FIG. The leg bend pipe 100 shown in FIG. 4 (A) and the leg bend pipe 300 shown in FIG. 4 (C) are restrained in height, but the leg bend pipe 200 shown in FIG. 4 (B). Is a normal bend pipe whose height dimension is not restricted. Conventionally, when trying to suppress the height dimension of the leg bend pipe, the leg bend pipe 200 shown in FIG. 4B is changed to the leg bend pipe 300 shown in FIG. 4C. (Furthermore, in Patent Document 1, a blade-like rib is provided). Even though the leg bend pipe 300 can suppress the dimension in the height direction with respect to the leg bend pipe 200, the flow direction is suddenly changed in the bend part, and thus the flow is disturbed and the desired drainage is generated. It is difficult to achieve performance. This will be described with reference to FIG.

5A is a diagram in which FIGS. 4A and 4B are superimposed, and FIG. 5B is a diagram in which FIGS. 4A and 4C are superimposed. In FIGS. 5A and 5B, the drainage (most lateral main pipe side) in the leg bend pipe is indicated by a white arrow.
As shown in FIG. 5 (A), in the leg bend pipe 100 according to the present embodiment, the waste water that flows down from the side of the horizontal main pipe collides with the inner peripheral surface of the bend part 130 at an angle β (1). The direction is changed to flow toward the horizontal main pipe. This angle β (1) is substantially the same as the angle β (2) in the case where the drainage in the leg bend pipe 200 collides with the inner peripheral surface of the bend part and flows toward the horizontal main pipe.

  On the other hand, as shown in FIG. 5B, the drainage in the leg bend pipe 300 collides with the inner peripheral surface of the bend part with respect to the angle β (1) in the leg bend pipe 100 according to the present embodiment. The angle β (3) in the case of the flow toward the horizontal main pipe is small. That is, in the leg bend pipe 300, the waste water that has flowed down from the side of the horizontal main pipe collides at an angle β (3) that is closer to the inner peripheral surface at a perpendicular angle, and the flow direction becomes a flow toward the horizontal main pipe. If the curvature of the bend portion is increased (the curvature radius is decreased) as in the leg bend pipe 300, the height direction can be suppressed, but the flow direction changes suddenly at the bend portion. It is difficult to achieve desired drainage performance due to turbulence and stagnation.

Furthermore, the drainage test result of the leg bend pipe 100 according to the present embodiment using the leg bend pipe 300 as a comparative example is shown in FIG. This figure is based on the “Air Drainage Capacity Test Method for Collective Drainage Standpipe System” (SHASE-S218-2008), which is the standard of the Society for Air Conditioning and Sanitary Engineering (SHASE-S218-2008). The pressure distribution in the pipe is shown.
The leg bend pipe 100 and the leg bend pipe 300 satisfy the permissible pressure fluctuation ± 400 Pa, but the leg bend pipe 100 is lower than the leg bend pipe 300 on the positive pressure side. This is particularly preferable in that the pressure in the tube is suppressed. From the drainage test results, it is clear that the leg bend pipe 100 is preferable in terms of drainage performance compared to the leg bend pipe 300. Thus, it is thought that the reason why the leg bend pipe 100 is preferable in the drainage performance is that it has been described with reference to FIG.
[Drainage piping structure]
Next, a drainage pipe structure using such a leg bend pipe 100 will be described. First, the first drain piping structure will be described with reference to FIGS. 7 and 8, and then the second drain piping structure will be described with reference to FIG. 9, and further with reference to FIGS. The third drain piping structure will be described.
First drainage pipe structure In FIG. 7 and FIG. 8, when a standing pipe (straight pipe) 500 is adopted as a drainage standing pipe, a leg bend is placed under the floor of the lowest floor (here, the second floor) of the building. The drain piping structure provided with the pipe is shown. In addition, the leg bend pipe 100 is employ | adopted in the drain piping structure shown in FIG. 7, and the leg bend pipe 200 is employ | adopted in the drain piping structure shown in FIG. 8 for the comparison.

As shown in FIG. 7, in this drainage pipe structure, the leg bend pipe 100 according to the present embodiment is arranged in a space between the second floor slab (the lowest floor slab) 510 and the first floor ceiling surface 570. In the upper pipe connecting part 110, the vertical pipe 500 is in the horizontal main pipe connecting part 120 and the horizontal main pipe 560 is in the leg bend pipe 1.
00, the drainage flowing down the vertical pipe 500 in the vertical direction is changed by the bend unit 130 in the horizontal direction. The vertical pipe 500 is suspended from the second floor slab 510 by the hanging metal fitting 520 and the suspension bolt 530, and the leg bend pipe 100 is suspended by the angle steel 550, the U bolt 540 and the suspension bolt 530. Further, R (1) in FIG. 7 is the same as FIG. Further, in this drainage pipe structure, the nominal diameter of the standpipe 500 (upper pipe connection part 110) is 100A (100 mm, 4 inches), and the nominal diameter of the horizontal main pipe 560 (horizontal main pipe connection part 120) is 150A ( 150 mm, 6 inches), and in this case, R (1) = 187 mm, A (1) = 180 mm, H (1) = 200 mm, and L (1) = 400 mm.

On the other hand, as shown in FIG. 8, in the drainage pipe structure adopting the leg bend pipe 200 arranged in the same position in the same manner, the nominal diameter of the standing pipe 500 is 100 A (100 mm, 4 inches), The nominal diameter of the horizontal main pipe 560 is 150A (150 mm, 6 inches), and R (1) = 187 mm, A (2) = 279 mm, H (2) = 315 mm, and L (2) = 515 mm. The drainage pipe structure employing the leg bend pipe 100 shown in FIG. 7 can raise the first floor ceiling height by 115 mm compared to the drainage pipe structure employing the leg bend pipe 200 shown in FIG.
Second drainage pipe structure FIG. 9 shows a case where the lowest floor drainage pipe joint 600 is adopted as a drainage standpipe, and the leg bend pipe 100 is placed under the floor of the lowest floor (here, the second floor) of the building. The drain piping structure provided with is shown. The lowermost floor drainage pipe joint 600 is connected to an upper vertical pipe connecting part (this nominal diameter is, for example, 100 mm (4 inches)) for connecting to an upper drainage vertical pipe, and a leg bend pipe 100. For connecting the drainage from the lateral direction into the pipe between the lower pipe connection part (the nominal diameter is, for example, 125 mm (5 inches)) and the upper vertical pipe connection part and the lower pipe connection part And a water collecting chamber provided with a lateral branch pipe connecting portion. Further, in the drainage pipe joint 600 for the lowermost floor, the nominal diameter 125 mm (5 inches) of the lower pipe connection portion is larger than the nominal diameter 100 mm (4 inches) of the upper vertical pipe connection portion. Is characterized in that it has a larger inner diameter than the nominal diameter of the lower pipe connection part and the nominal diameter of the upper vertical pipe connection part (for example, 140 mm). Further, the lower floor drainage pipe joint 600 is characterized in that the lower pipe connecting portion is a straight tubular straight and can be cut to an arbitrary length and connected to the leg bend pipe 100. And

  The nominal diameter of the upper pipe connecting portion 110 of the leg bend pipe 100 connected to the drainage pipe joint 600 for the lowermost floor is 125A (125 mm, 5 inches), and the horizontal main pipe 560 (the horizontal main pipe connecting portion 120). ) Is 150A (150 mm, 6 inches), and in this case, R (1) = 187 mm, A (1) = 180 mm, H (1) = 200 mm, and L (1) = 400 mm.

On the other hand, although not shown, in the drainage pipe structure adopting the leg bend pipe 200 arranged in the same position in the same manner, the nominal diameter of the upper pipe connecting portion of the leg bend pipe 200 is 125 A (125 mm, 5 inches). The nominal diameter of the horizontal main pipe 560 (the horizontal main pipe connecting portion 120) is 150 A (150 mm, 6 inches), and R (1) = 187 mm, A (1) = 278 mm, H (1) = 315 mm, L (1) = 515 mm. Even when connected to a drainage pipe joint, the drainage pipe structure employing the leg bend pipe 100 shown in FIG. 9 is 115 mm higher than the drainage pipe structure employing the leg bend pipe 200. Can be raised.
-3rd drainage pipe structure With reference to FIGS. 10-14, it is a case where the drainage pipe joint 1100 for the lowest floor is employ | adopted as a drainage standpipe, Comprising: Below the floor of the lowest floor (here 2nd floor) of a building A drainage pipe structure in which the leg bend pipe 100 is provided will be described. First, the lowest floor drain pipe joint 1100 will be described. The lowermost floor drainage pipe joint 1100 differs from the lowermost floor drainage pipe joint 600 only in that a rectifying ring 170 is provided. For this reason, the following description of the lowermost floor drainage pipe joint 1100 is also an explanation of the lowermost floor drainage pipe joint 600 except that the rectifying ring 170 is provided.

FIG. 10 shows a side view and a sectional view of the lowermost drainage pipe joint 1100, and FIG. 11 shows a top view of the lowermost floor drainage pipe joint 1100.
The lowermost floor drainage pipe joint 1100 is a lowermost floor drainage pipe joint that is disposed through the floor slab of the lowermost floor. The drainage pipe joint 1100 for the lowest floor is connected to an upper riser connection part 1110 connected to a drainage standpipe, a lower pipe connection part 1190 connected to other pipes, and two side branch pipes. The lateral branch pipe connecting portion 1120 and the lateral branch pipe connecting portion 1130, and the water collecting chamber 1150 in which the lateral branch pipe connecting portion 1120 and the lateral branch pipe connecting portion 1130 open into the pipe are included.

What is characteristic is that a rectifying ring 1170 formed of an annular protrusion is disposed on the inner peripheral surface below the side branch pipe connection portion 1120 and the side branch pipe connection portion 1130. Details of the rectifying ring 1170 will be described later.
When the lowermost floor drainage pipe joint 1100 is put into a use state, the upper vertical pipe connection part 1110 is positioned at the upper part of the lowermost floor drainage pipe joint 1100 main body to serve as a drainage flow inlet, and the lower pipe The connecting portion 1190 is positioned at the lower part of the lowermost drainage pipe joint 1100 main body and serves as a drainage outlet, and the side branch pipe connecting part 1120 and the side branch pipe connecting part 1130 are connected to the upper and lower upper vertical pipe connecting parts 1110. It is positioned between the lower pipe connecting portion 1190 and turned sideways to serve as a drainage flow inlet. The lateral branch pipe connecting portion 1120 and the lateral branch pipe connecting portion 1130 are not limited to the horizontal orientation, but may be obliquely upward or laterally with an offset. In the present embodiment, the upper pipe connected to the upper vertical pipe connection portion 1110 corresponds to the drainage vertical pipe, and the lower pipe connected to the lower pipe connection portion 1190 corresponds to the leg bend pipe. Is done. Further, a horizontal main pipe is connected to the leg bend pipe. Note that another pipe (straight pipe) may be provided between the lower pipe connecting portion 1190 and the leg bend pipe.

  Further, the side branch pipe connected to the side branch pipe connection portion 1120 and the side branch pipe connection portion 1130 is not limited to the lowest floor of the building (not limited to the first floor of the building, but is set up as a drainage standpipe. Piped at the lowest level in the range. Note that, in the drainage pipe joint 1100 for the lowermost floor according to the present embodiment, two side (two) ones are shown as the side branch pipe connection part 1120 and the side branch pipe connection part 1130. It is not limited, and may be one (one), three (three), or four (four). 10 and 11, the lateral branch pipe connecting portion 1120 and the lateral branch pipe connecting portion 1130 are each provided with a receiving portion 1122 and a receiving portion 1132, and the receiving portion 1112 and the receiving portion 1132 have a known rubber ring. A rubber ring 1124 and a rubber ring 1134 are respectively fitted in the same manner as the type receiving port. The end of the horizontal branch pipe on the bottom floor drainage pipe joint 1100 side is press-fitted into the rubber ring 1124 or the rubber ring 1134, and the bottom floor drainage pipe joint 1100 and the side branch pipe are connected in a watertight manner with one touch. It has become so.

In the drainage pipe joint 1100 for the lowest floor, a water collecting chamber 1150 is formed corresponding to a portion where the horizontal branch pipe connecting portion 1120 is provided, and the inside of the water collecting chamber 1150 has an upper vertical pipe connecting portion 1110, It is formed wider than any nominal diameter of the lower pipe connecting portion 1190 and the lateral branch pipe connecting portion 1120.
Since such a water collection chamber 1150 is provided, an enlarged-diameter portion 1140 having an enlarged internal width is formed between the upper vertical pipe connection portion 1110 and the lateral branch pipe connection portion 1120, and the horizontal A reduced diameter portion 1180 whose internal width is reduced is formed between the branch pipe connecting portion 1120 and the lower pipe connecting portion 1190, and a space between the enlarged diameter portion 1140 and the reduced diameter portion 1180 is formed into a zun barrel shape. It is formed thickly.

Since this lowermost floor drainage pipe joint 1100 is for the lowermost floor, a state in which the water collecting chamber 1150 protrudes onto the floor slab on the lowermost floor (the side connecting to the lateral branch pipe connecting portion 1120). The lower pipe connecting portion 1190 is inserted into an installation hole provided in the floor slab, and the branch pipe is placed on the floor slab. The interior of the water collecting chamber 1150 is formed as a simple cavity, and swirl vanes for imparting swirling to the drainage flow flowing down the upper pipe (drainage stack), and drift current for causing the drainage flow along the pipe wall A board is not required. Rather, in order to prevent generation of washing foam and excessive positive pressure due to turbulent flow in the drainage flow in the lower pipe (leg bend) connected to the downstream side of the lowermost drainage pipe joint 1100, It is better not to have these swirl vanes and drift plates. Therefore, it is not provided in the lowermost drainage pipe joint 1100 according to the present embodiment.

  10 and 11, the upper vertical tube connecting portion 1110 includes a receiving portion 1112, and a rubber ring 1114 is fitted to the receiving portion 1112 in the same manner as a known rubber ring type receiving port. Is pressed into the rubber ring 1114 so that the lowermost floor drainage pipe joint 1100 and the upper pipe are connected in a watertight manner with a single touch. In this way, since the upper tube is inserted into the upper vertical tube connecting portion 1110, the inner diameter of the upper vertical tube connecting portion 1110 is formed to be large enough to fit the upper tube. However, when the upper pipe is inserted, the inner diameter that is effectively used for the flow of the drainage flow in the upper vertical pipe connection portion 1110 is equivalent to that of the upper pipe (drainage vertical pipe). In other words, the upper vertical pipe connecting portion 1110 and the upper pipe have the same nominal diameter.

  10 and 11, since the lower pipe connecting portion 1190 is a straight outlet, the lower pipe connecting portion 1190 itself is attached to the receiving portion provided at the upper end portion of the lower pipe (leg bend pipe). Will be plugged in. Accordingly, the inner diameter of the receiving portion of the lower pipe is formed so as to be large enough to fit the lower pipe connecting portion 1190. However, when the lower pipe connecting portion 1190 is inserted, the flow of the drainage flow in the lower pipe The inner diameter effectively utilized for the lower pipe connection portion 1190 is the same. That is, the lower pipe connecting portion 1190 and the lower pipe have the same nominal diameter.

In the bottom floor drainage pipe joint 1100 main body according to the present embodiment, the nominal diameter of the lower pipe connection part 1190 is formed larger than the nominal diameter of the upper vertical pipe connection part 1110. The degree of diameter increase is roughly equivalent to the size of 1 to 2 sizes in the standard as the nominal diameter.
As described above, the upper pipe connection portion 1110 and the upper pipe (drainage stack) have the same nominal diameter, and the lower pipe connection portion 1190 and the lower pipe (leg bend pipe) have the same nominal diameter. Thus, it is clear that the nominal diameter of the lower pipe is larger than the nominal diameter of the upper pipe. In this lower pipe (leg bend pipe), the nominal diameter is made constant at the downstream side thereof, or at least it is taken over to the horizontal main pipe without being reduced. Also, the nominal diameter is also maintained in the horizontal main pipe, or at least it is piped so as not to be reduced. Further, the increased nominal diameter is not reduced in the region extending from the leg bend pipe to the horizontal main pipe and further downstream from the horizontal main pipe to the drainage mass. ing. That is, the nominal diameters of the inlet joint portion and the outlet joint portion of the leg bend pipe are the same.

  Because of this structure, the flow of the drainage flow that flows down the upper pipe (drainage standpipe) and flows through the lower pipe (leg bend pipe) to the horizontal main pipe is smoothed as the nominal diameter increases. The Similarly, the drainage flows that merge from the side branch pipe through the side branch pipe connection portion 1120 of the drainage pipe joint 1100 for the lowest floor are smoothly joined. In addition, since the internal capacity of the lowermost floor drainage pipe joint 1100 is substantially increased in the lowermost floor drainage pipe joint 1100, the lowermost floor drainage pipe joint 1100 has a lower pipe (leg bend). The occurrence of excessive positive pressure is prevented both in the pipe) and in the horizontal main pipe, and naturally, the occurrence of excessive positive pressure in the upper pipe (drainage stack) is also prevented.

  In the present embodiment, as described above, the nominal diameter of the lower pipe connecting portion 1190 is larger than the nominal diameter of the upper standing pipe connecting portion 1110, and the inner diameter of the water collecting chamber 1150 is the nominal diameter of the lower pipe connecting portion 1190 and A rectifying ring 1170 shown in FIG. 12 is provided at the position shown in FIG. 10 of the drainage pipe joint 1100 for the lowest floor, which is larger than any of the nominal diameters of the upper standing pipe connection part 1110. Details of the rectifying ring 1170 will be described below. The perspective view of the rectifying ring 1170 shown in FIG. 12 is a conceptual diagram for understanding the structure of the rectifying ring 1170. In practice, the rectifying ring 1170 is integrated with the drainage pipe joint 1100 for the lowermost floor. Since it is manufactured, the rectifying ring 1170 alone cannot be taken out. FIG. 13 is a view showing the lowermost drainage pipe joint 1100 and piping connected thereto, and a diagram for explaining the drainage performance of the lowermost floor drainage pipe joint 1100 is shown.

As shown in FIGS. 10 and 13, the rectifying ring 1170 is provided on the inner peripheral surface below the side branch pipe connecting portion 1120 and the side branch pipe connecting portion 1130, but preferably, the water collecting chamber 1150. It is preferable to arrange on the inner peripheral surface. As shown in FIGS. 10, 12, and 13, the rectifying ring 1170 includes an annular protrusion 1170 </ b> A provided on the entire inner peripheral surface of the water collecting chamber 1150. In the rectifying ring 1170, the upper surface of the annular protrusion 1170A includes a first inclined surface 1170B inclined downward toward the direction approaching the tube axis center, and the upper end thereof forms an edge portion 1170C. Further, in the rectifying ring 1170, the lower surface of the annular protrusion 1170A includes a second inclined surface 1170D (inverse taper with the first inclined surface 1170B) inclined downward toward the direction away from the tube axis center. Yes. Note that the edge portion 1170C may have a slight width in the tube axis direction due to manufacturing restrictions. Further, the second inclined surface 1170D may be vertical or may not include the second inclined surface 1170D.

  Further, the diameter D (3) of the inner edge of the annular projection 1170A of the rectifying ring 1170 (the minimum inner diameter of the rectifying ring 1170) is larger than the nominal diameter D (1) of the upper vertical pipe connecting portion 1110, and the lower portion It is smaller than the nominal diameter D (4) of the pipe connecting portion 1190 (that is, D (1) <D (3) <D (4)). As described above, the nominal diameter D (4) of the lower pipe connecting portion 1190 is larger than the nominal diameter D (1) of the upper vertical pipe connecting portion 1110 (that is, D (1) <D (4)), and the water collecting chamber The inner diameter D (2) of 1150 is larger than both the nominal diameter D (4) of the lower pipe connecting portion 1190 and the nominal diameter D (1) of the upper vertical pipe connecting portion 1110 (that is, D (1) <D (4) <D (2)), D (1) <D (3) <D (4) <D (2).

  In the drainage pipe joint 600 for the lowermost floor not provided with the rectifying ring 1170, the nominal diameter D (4) of the lower pipe connection portion 1190 is set larger than the nominal diameter D (1) of the upper vertical pipe connection portion 1110. Further, the inner diameter D (2) of the water collecting chamber 1150 is larger than D (4) and D (1), and the drainage pipe joint 1100 main body has a substantially increased capacity in the pipe. The performance is secured. However, in such a drainage pipe joint for the lowest floor (for example, when used in a high-rise building), when the amount of drainage is large, the drainage speed increases and is drawn into the flow and negative pressure is generated in the drainage stack. May occur. While this negative pressure is suppressed by the rectifying ring 1170 for such a large amount of drainage, the drainage performance is maintained.

  As shown in FIG. 13, the waste water collected from the upper pipe and the side branch pipe to the water collecting chamber 1150 and flowing down from the water collecting chamber 1150 is formed by the first inclined surface formed by the annular protrusion 1170A of the rectifying ring 1170. Contact with 1170B is once decelerated and generation of negative pressure due to drawing can be suppressed. Further, the waste water flowing down from the water collecting chamber 1150 flows along the first inclined surface 1170B, and the flow is similar to the upper pipe so that the outer edge of the flow does not run along the inner wall of the lower pipe connecting portion 1190. In addition, the desired drainage performance can be maintained by maintaining the flow of drainage including air at the center of the flow. In this case, the width of the wastewater flow including the air in the central portion of the flow is narrowed by the rectifying ring 1170, so that the air in the central portion of the flow is compressed and generation of negative pressure can be suppressed.

FIG. 14 shows the case where the lowermost floor drainage pipe joint 1100 is adopted as the upper pipe connected to the leg bend pipe 100, and the leg part is located under the floor of the lowest floor (here, the second floor) of the building. The drain piping structure provided with the bend pipe 100 is shown.
The lowermost floor drainage pipe joint 1100 is different only in that it includes a rectifying ring 1170 that the lowermost floor drainage pipe joint 600 does not have, and the lowermost floor drainage pipe joint 1100 has a nominal diameter and outer shape. In this case, R (1) = 187 mm, A (1) = 180 mm, H (1) = 200 mm, and L (1) = 400 mm. Thus, compared to the drainage pipe structure employing the leg bend pipe 200 shown in FIG. 8, the ceiling height of the first floor is increased as in the drainage pipe structure employing the leg leg bend pipe 100 shown in FIG. 115 mm can be raised.
[Effects of Leg Bend Pipe and Drainage Pipe Structure According to Embodiment]
As described above, according to the leg bend pipe according to the present embodiment and the drainage pipe structure using the leg bend pipe, the drainage performance is maintained without providing ribs or the like in the pipe even if the dimension in the height direction is suppressed. be able to. In addition, by combining with the lower-floor drainage pipe joint provided with a rectifying ring, to achieve the lowest-level drainage piping structure that maintains drainage performance even in high-rise buildings while suppressing the height dimension. Can do.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for leg bend pipes with a reduced dimension in the height direction and a drainage pipe structure using the leg bend pipes, and particularly in that drainage performance can be maintained without providing ribs or the like in the pipes. preferable.

100 leg bend pipe 110 upper pipe connection (stand pipe connection)
112 Receiving Portion 114 Rubber Ring 120 Horizontal Main Pipe Connection Portion 122 Flange 124 Flange Hole 130 Bend Portion (Bent Pipe Portion)
200 Leg bend pipe (conventional example)
300 Leg Bend Tube (Comparative Example)
500 Stand pipe 510 Second floor slab (bottom floor slab)
520 Suspension fitting 530 Suspension bolt 540 U bolt 550 Angle steel 560 Horizontal main pipe 570 1st floor ceiling surface 600 Drainage pipe joint for the lowest floor (without rectifying ring)
1100 Bottom floor drainage pipe joint (with rectifying ring)

Claims (5)

An upper pipe connecting portion connected to a drainage stack penetrating the floor slab on the lowest floor, a horizontal main pipe connecting portion connected to a horizontal main pipe, a tube axis direction of the upper pipe connecting portion, and a horizontal main pipe connecting portion A leg bend pipe provided with a bend section that changes the direction so as to be orthogonal to the pipe axis direction and connects the upper pipe connection section and the horizontal main pipe connection section,
In the bend portion, an arc shape whose center axis is less than 90 degrees is formed,
The leg bend pipe, wherein the central axis direction and the pipe axis direction of the horizontal main pipe connection part are parallel to each other at a connection part between the bend part and the horizontal main pipe connection part. The leg bend pipe according to claim 1, wherein a central angle of the arc shape formed by the central axis is in a range of 45 degrees or more and 65 degrees or less. 3. The leg bend pipe according to claim 1, wherein the upper pipe joint part has a receiving shape and includes a rubber ring that is watertightly connected to the drainage stack. 4. A drainage pipe structure comprising a leg bend pipe according to any one of claims 1 to 3, a bottom floor drainage pipe joint penetrating a floor slab on the bottom floor, and a horizontal main pipe,
The lowermost floor drainage pipe joint includes an upper riser connection part for connecting to the upper drainage standpipe, a lower pipe connection part for connecting to the lower leg bend pipe, and the upper riser connection A water collecting chamber provided with a lateral branch pipe connection part for draining the drainage from the lateral direction into the pipe between the lower part and the lower pipe connection part,
The nominal diameter of the lower pipe connection part is larger than the nominal diameter of the upper vertical pipe connection part,
The drainage pipe structure characterized in that an inner diameter of the water collecting chamber is larger than both a nominal diameter of the lower pipe connecting portion and a nominal diameter of the upper vertical pipe connecting portion. 5. The lowermost floor drainage pipe joint is characterized in that the lower pipe connecting portion is a straight tubular straight, and can be connected to the leg bend pipe by cutting to an arbitrary length. The drainage piping structure described in 1.

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