JP2007247160A - Merging joint and drainage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a merging joint which can suppress the backflow of wastewater upstream of a horizontal drainage main, even on the frequent occurrence of the case where the wastewater is simultaneously discharged from a plurality of drainage risers and discharged into the horizontal drainage main, and which can prevent, for example, the emission of a malodor, caused by the seal destruction of a trap, by suppressing the rise of in-pipe pressure. <P>SOLUTION: This merging joint, which connects a horizontal drainage branch pipe P2 and the horizontal drainage main P1 arranged in the state of crossing the branch pipe P2, comprises a horizontal straight pipe section 1, a vertical straight pipe section 2, and a communication pipe section 3. The wastewater flowing from the branch pipe P2 flows in such a manner as to be stepwise bent along an axis X2, an axis X3, an axis X4 and an axis X1 in this order. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a junction joint for connecting a drainage horizontal branch pipe and a drainage horizontal main pipe connected to a lower portion of a drainage stack, and a drainage system using the junction joint.

  The drainage system for high-rise buildings consists of a plurality of drainage stacks into which drainage from each floor flows, a plurality of drainage branch pipes connected to the lower part of each drainage stack to convert the wastewater into a horizontal flow, and the plurality of drainage pipes. It is connected to a horizontal branch pipe and is constructed with a drainage horizontal main pipe that joins and flows a plurality of drainage.

  The connection between the drainage horizontal branch pipe and the drainage horizontal main pipe is connected by a joint, but depending on the structure of the joint and the diameter of each pipe, the pressure inside the pipe rises, that is, a positive pressure, and the trap is not ejected. Odor generation will occur.

Then, what paid its attention to this joint part (merging part) has already been proposed.
For example, the slope of the connecting portion of the joint pipe is made larger than the slope inclined downward as it goes downstream of the drainage horizontal main pipe, and is made downward and larger than the slope gradient downward as it goes downstream of the drainage horizontal branch pipe. In addition, there is a lateral drainage pipe merging structure that prevents backflow upstream in the drainage horizontal main pipe by accelerating the drainage at the connecting portion (see, for example, Patent Document 1).

  Further, in order to make the drainage flow velocity in the attachment portion of the sub horizontal main pipe larger than the flow velocity in the main horizontal main pipe, the flow rate of a certain length having a gradient of 1/25 to 1/2 from the attachment portion to the sub horizontal main pipe side. There is a joining pipe structure of a horizontal main pipe provided with an acceleration section (see, for example, Patent Document 2).

  Furthermore, in a plan view in which the main pipe part of the straight pipe and the pipe axis of the main pipe part are set horizontally, the second pipe axis that obliquely intersects the pipe axis is provided on the side surface of the main pipe part. A branch pipe section, a second pipe axis of the branch pipe section, and a horizontal pipe section having a third pipe axis that intersects in an outward bending direction in plan view, the second pipe axis of the branch pipe section and the horizontal pipe The third tube axis of the portion is a lateral merging tube in which an outer bending angle formed in a plane including these two axes is set to 45.4 to 65.4 degrees (see, for example, Patent Document 3).

Registration Utility No. 2527833 (first page, FIG. 1) Japanese Patent No. 2546923 (first page, FIG. 1) Japanese Patent Laying-Open No. 2005-2780 (first page, FIG. 1)

  In any of the conventional techniques described above, the connecting portion between the drainage horizontal branch pipe and the drainage horizontal main pipe is formed by an inclined portion having a larger gradient than usual, and has a structure that further increases the merging speed. According to this structure, the drainage flow flowing in the drainage horizontal main pipe and the drainage flow of the drainage horizontal branch pipe become smooth, so there is no reverse flow in the pipe and the ventilation space of the drainage horizontal main pipe is narrowed. There seems to be nothing to do.

  However, in the case of high-rise apartments and high-rise office buildings where the number of drained houses is extremely high, there are frequent cases where water is drained simultaneously from a plurality of drainage stacks and drained into a horizontal drainage main pipe. In addition, since the flow is fast, the flowing water flows to the side of the drainage horizontal pipe while entraining air. In particular, the merging in the merging pipe (joint) disposed on the downstream side may be violently mixed and not smoothly performed. For this reason, any of the above-described conventional techniques sometimes cannot completely prevent the positive pressure from being suppressed. In addition, when the rainfall increased rapidly, the water level suddenly increased due to the rainwater merged from the drainage horizontal branch pipe to the drainage horizontal main pipe, the flow could not catch up, and stagnation occurred, causing a phenomenon of backflow upstream of the drainage horizontal main pipe.

  Therefore, the present invention has been made in view of such a situation, and even if there are frequent cases where water is drained simultaneously from a plurality of drainage stacks and drained to a drainage horizontal main pipe, drainage to the drainage horizontal main pipe upstream is performed. It is an object of the present invention to provide a confluence joint and a drainage system that can suppress the reverse flow of the gas, suppress the increase of the pressure in the pipe, and prevent the generation of malodor due to the breaking of the trap.

In order to achieve the above technical problem, the junction joint and the drainage system according to the present invention employ the following technical means.
The merging joint according to claim 1 is a merging joint for connecting the drainage lateral branch pipe and the drainage lateral main pipe, and the step of flowing the fluid flowing from the drainage lateral branch pipe toward the downstream side of the drainage lateral main pipe. It is characterized by the fact that a flow path is formed that is bent and joined to the drainage horizontal main pipe.

  In the present invention, "fluid flowing from the drainage horizontal branch pipe is bent stepwise toward the downstream side of the drainage horizontal main pipe and merged with the drainage horizontal main pipe" Is once bent and then bent to flow further. Whereas the prior art attempts to forcibly flow the flow from the drainage horizontal main pipe by increasing the flow velocity and directly merging, in the present invention, the flow direction of the drainage horizontal branch pipe is changed to the flow of the drainage horizontal main pipe. On the other hand, the flow is converted into a direction that does not interfere with the flow and gradually merged to obtain an even and smooth flow.

  The junction joint according to claim 2 includes a horizontal straight pipe portion that connects the drainage horizontal main pipes at both ends, and the drainage horizontal branch pipe that is piped in a direction orthogonal or substantially orthogonal to the horizontal straight pipe portion in plan view. It is characterized by comprising a vertical straight pipe part to be connected, and a connecting pipe part formed so as to communicate the horizontal straight pipe part and the vertical straight pipe part and in which the flow path is formed.

  According to a third aspect of the present invention, there is provided the junction joint, wherein the connecting pipe portion of the junction joint has a first side wall formed in a substantially concave curved shape in a cross-sectional plan view of the junction joint, and a predetermined distance from the first side wall. And is formed so as to connect the horizontal straight pipe portion and the vertical straight pipe portion with the second side wall formed in a substantially convex curved shape so as to face each other, and on the horizontal straight pipe portion side of the first side wall. A parallel portion is formed so that the end portion and the end portion of the second side wall on the vertical straight pipe portion side are parallel or substantially parallel, and the second side wall continuous with the parallel portion is defined as the horizontal straight pipe portion. And an inclined portion that is joined so as to be inclined.

  This junction joint converts the flow of the drainage side branch pipe through the end of the first side wall on the side of the horizontal straight pipe portion into the direction of the inclined portion of the second side wall along the parallel portion. It is intended to bend the flow direction and join the flow of the drainage horizontal main pipe.

  According to a fourth aspect of the present invention, there is provided the junction joint including a partition portion that partitions the vertical straight pipe portion and the horizontal straight pipe portion from an end portion of the first side wall on the horizontal straight pipe portion side to an inclined portion of the second side wall. It is characterized by being formed.

  The junction joint according to claim 5 relates to the partition portion, and in the cross-sectional plan view of the junction joint, the end of the first side wall on the horizontal straight pipe portion side is formed in a tongue shape, and in the longitudinal plan view, the first It becomes a substantially C-shaped side wall over the inclined portion of the two side walls.

  By providing such a partition, the direction of the flowing water is bent by the tongue-shaped end, and gradually drops into the horizontal straight pipe while proceeding along the C-shaped side wall toward the inclined portion of the second side wall. So as to bend the direction. At this time, by changing the vector of flowing water to a vector substantially parallel to the horizontal straight pipe portion, it is possible to smoothly merge with the flow of the drainage horizontal main pipe.

  The junction joint according to a sixth aspect is characterized in that the partition portion is extended so as to slightly enter the horizontal straight pipe portion. As described above, since the partitioning portion is inside the flow of the horizontal straight pipe portion, the above-described joining to the horizontal straight pipe portion can be performed more smoothly and smoothly.

  Moreover, this invention has a drainage standpipe, a drainage horizontal branch pipe, and a drainage horizontal main pipe, The connection of the said drainage horizontal branch pipe and the said drainage horizontal main pipe is in any one of the said Claims 1-6. It is a drainage system characterized by performing using a joint joint of.

  According to the present invention, once the flowing water flowing from the drainage horizontal branch pipe is bent toward the downstream side of the drainage horizontal main pipe, the joining joint for connecting the drainage horizontal branch pipe and the drainage horizontal main pipe is further oriented. It was made to bend so as to change, that is, to bend and flow in stages. In this way, the flow vector is continuously changed to enable smooth merging. For example, when drained simultaneously from a plurality of drainage stacks and drained to a drainage horizontal main pipe, the momentum of merging in each merging joint becomes uniform, and merging at the merging joint disposed on the downstream side is also performed smoothly. be able to. In other words, by using the junction joint according to the present invention, it is possible to achieve overall harmony (high balance) as a drainage system, and as a result, trapping and generation of bad odor occur without increasing the pipe pressure. Etc. can be prevented.

Next, an embodiment of a junction joint according to the present invention and a drainage system using the same will be described.
Fig. 4 shows the outline of the drainage system in high-rise buildings such as high-rise apartments. P4 is a horizontal drainage pipe for equipment drainage provided at each level, P3 is a drainage standpipe through which drainage from each floor flows, and P2 is a horizontal drainage A branch pipe, P1, is a drainage horizontal main pipe. The drainage stack P3 is connected to the leg elbow joint L and connected to the drainage horizontal branch pipe P2 in the basement. The drainage is converted into a horizontal flow by the drainage horizontal branch pipe P2 and connected to the drainage horizontal main pipe P1 through the junction joint T. In this way, a drainage system is constructed.

FIG. 1 is a cross-sectional plan view showing a junction joint according to the present embodiment, FIG. 2 is a vertical plan view taken along the line AA, FIG. 3A is a left side view, and FIG. 3B is a right side view. .
The junction joint T includes a horizontal straight pipe portion 1, a vertical straight pipe portion 2, and a connecting pipe portion 3. Although it may be made of synthetic resin, it is usually integrally formed of iron-based casting, and the drainage horizontal main pipes P1 are connected to each other in a straight line, and the drainage horizontal extending in a direction orthogonal to the drainage horizontal main pipe P1 The branch pipe P2 is connected to connect the drainage from the drainage horizontal branch pipe P2 to the drainage horizontal main pipe P1 which is the main pipe. At this time, in order to prevent the drainage flow from stagnating or backflowing, the pipe is piped with an overall inclination (gradient) in the vertically downward direction downstream. The inclination is generally the reciprocal of the nominal diameter of the tube, for example 1/100 for a nominal 100 tube.

  The horizontal straight pipe portion 1 is formed in a cylindrical shape with a main pipe connection portion 1a for connecting the drainage horizontal main pipe P1 formed at both ends with the horizontal axis line X1 as the center. The connection structure may be a connection structure that ensures watertightness, and is composed of, for example, a rubber packing, a flange that presses the packing in the axial direction, and a bolt and a nut that tighten the flange in the axial direction. .

  The vertical straight pipe portion 2 is disposed on the upstream side of the horizontal straight pipe portion 1 and has a branch pipe connection portion 2a that connects the drainage horizontal branch pipe P2 around the axis line X2 orthogonal to the axis line X1 in a plan view. It is formed in the cylindrical shape formed. The branch pipe connection part 2a may have the same diameter as the main pipe connection part 1a or may have a smaller diameter than the main pipe. In addition, the connection structure of the branch pipe connection part 2a is the same as that of the case of the above-mentioned drainage horizontal main pipe part. Further, the vertical straight pipe portion 2 refers to the branch pipe connecting portion 2a and the vertical peripheral side surface formed slightly in a continuous manner downward in FIG.

  As shown in FIG. 1, the connecting pipe portion 3 has a first side wall 3a formed in a substantially concave curved shape in a transverse plane view, and a substantially convex shape in a transverse plane view so as to face the first side wall 3a with a predetermined interval. The second side wall 3b formed in a curved shape is formed in a tubular shape so as to connect the horizontal straight pipe portion 1 and the vertical straight pipe portion 2 so that drainage flows in a direction substantially parallel to the horizontal straight pipe portion 1. The parallel part formed around the axis X3 and the inclined part formed continuously with the parallel part and joined to the horizontal straight pipe part 1 so as to incline to the horizontal straight pipe part 1 (around the axis X4) And comprising. The second side wall 3b connected to the horizontal straight pipe portion 1 has a bulging shape that rises as a whole, and has a shape that increases the capacity of the opening.

  Here, as shown in FIG. 2, the radial region of the first side wall 3a is a free portion that connects the substantially C-shaped portion 3e that forms the left side of the merging opening Y1 and the radial left half of the vertical straight pipe portion 2. It is an area of a curved surface and is formed so as to cover the opening of the vertical straight pipe portion 2 indicated by a dotted line in the direction of arrows AA. The area in the radial direction of the second side wall 3b is an area of a free curved surface that connects the portion that forms the right side of the merge opening Y1 and the right half of the vertical straight pipe portion 2 in the radial direction. That is, the lower side is the first side wall 3a and the upper side is the second side wall 3b with the axis X4 as a general boundary.

  The parallel part is formed so that the end 3c of the first side wall 3a on the horizontal straight pipe part 1 side and the end 3d of the second side wall 3b on the vertical straight pipe part 2 side are parallel to each other. The axis line X3, which is the center line, is formed so as to be parallel to the axis line X1. For this reason, the parallel portion is a peripheral portion around the axis X3. In addition, the parallel part and parallel part handled by this invention are not exact | strict geometrically, but mean the range of the grade which is substantially parallel or is in a substantially parallel state. Therefore, when a cross-sectional plan view of the junction joint is drawn, it suffices if there is a substantially parallel part somewhere in the first side wall 3a and a part of the second side wall 3b.

  The inclined portion is formed by the convex curved surface of the second side wall 3b excluding the horizontal portion of the second side wall 3b forming the parallel portion, and the bending direction of the convex curve, the connecting pipe portion 3 and the horizontal straight pipe portion 1 are formed. An inclined axis line X4 that is drawn with reference to the center of the opening Y1 at the merging point is formed so as to intersect the axis line X3 on the downstream side of the axis line X2. For this reason, the inclined portion is a peripheral portion around the axis X4.

  Further, a partition for partitioning the vertical straight pipe portion 2 and the horizontal straight pipe portion 1 from the end portion on the horizontal straight pipe portion 1 side of the first side wall 3a to the inclined portion on the second side wall 3b side between the parallel portion and the inclined portion. The part is formed. The partition part is an extension of the end of the first side wall 3a in a cross-sectional plan view, and protrudes like a tongue 3c (see FIG. 1). An extending side wall 3e is formed (see FIG. 2). Therefore, the partition part 3f consists of the tongue-shaped end part 3c and the C-shaped side wall 3e, and when viewed from the AA arrow in FIG. 1 (see FIG. 2), the vertical straight pipe part as indicated by the dotted line Y2 2 is invisible. In this way, the vertical straight pipe portion 2 and the horizontal straight pipe portion 1 are partitioned by the tongue-shaped end portion 3c so that the drainage flow from the drainage horizontal branch pipe P2 does not directly merge with the flow of the drainage horizontal main pipe P1 from the orthogonal direction. I have to.

  As shown by the arrow in FIG. 1, the flowing water from the drainage horizontal branch pipe P2 is bent by approximately 90 ° by hitting the tongue-shaped end portion 3c, and flows toward the inclined portion along the C-shaped side wall 3e. The convex curve portion 3b is stepped and the flow is changed in the direction of the axis X4. By such a change that once bends the flow, the flowing water from the drainage horizontal branch pipe P2 joins the flow of the drainage horizontal main pipe P1 by continuously changing the vector (speed and direction) without directly joining from the orthogonal direction. become. In addition, since the space of the inclined portion is formed as a bulging portion in a convex curve shape in order to enlarge the size of the merging opening Y1 at the merging portion of the connecting pipe portion 3 and the horizontal straight pipe portion 1, the merging is interrupted. The area is large. These actions provide a smooth flow without hindering the flow of the drainage horizontal main pipe P1, and also suppress a sudden rise in water level at the junction, and as a result, prevent backflow upstream and suppress pressure rise. It is done.

  Furthermore, the partition part 3f (the tongue-like end part 3c and the C-shaped side wall 3e) enters the horizontal straight pipe part 1 with respect to the inner diameter of the main pipe connection part 1a as shown in FIGS. It is extended to. By doing in this way, the flow from the drainage horizontal branch pipe P2 converted to be substantially parallel to the main flow of the drainage horizontal main pipe P1 enters from the beginning of the merge as part of the flow of the drainage horizontal main pipe P1, so gradually. The impact on the flow of the drainage horizontal main pipe can be reduced to make the merging smooth. The protruding length of the tongue-shaped end 3c and the amount of extension into the horizontal straight pipe are preferably set as follows. First, with respect to the protruding length, the effect can be obtained by extending it to the downstream side of the drainage horizontal main pipe, but it is preferable that the distance from the axis X2 is about half of the minimum inner diameter of the vertical straight pipe portion 2. Moreover, the amount of entering in the radial direction is preferably 10% to 20% with respect to the inner diameter of the horizontal straight pipe portion. A sufficient opening area can be realized by a compact joint while maintaining the bending action.

  In the junction joint according to the present embodiment configured as described above, the drainage horizontal branch pipe P2 connected to the lower part of the drainage stack is connected to the branch pipe connection part 2a, and the drainage horizontal main pipe is connected to the main pipe connection part 1a. Connect P1. And the drainage flow from drainage horizontal branch pipe P2 flows along these axes in order of axis line X2-axis line X3-axis line X4-axis line X1. That is, the drainage flowing from the drainage lateral branch pipe P2 is bent stepwise toward the downstream side of the drainage horizontal main pipe P1 so as to gradually join the drainage horizontal main pipe P1 while decreasing the drainage speed. It has become.

As described above, the drainage from the drainage horizontal branch pipe P2 is bent stepwise to flow into the drainage horizontal main pipe P1, so that even if drainage from a plurality of drainage stacks is simultaneously drained to the drainage horizontal main pipe P1, Since the merging momentum in the merging joint is uniform, the merging at the merging joint disposed on the downstream side can be performed smoothly and smoothly.
Therefore, by using the junction joint according to the present embodiment, it is possible to achieve overall harmony (high balance) as the drainage system, and as a result, the trap can be ejected without increasing the pipe pressure. Odor generation can be suppressed.

  In addition, since the axis line X3 and the axis line X1 are close to each other, and the inclined axis line X4 is formed so as to intersect the axis line X3 after a predetermined distance from the axis line X2 toward the downstream side, the junction joint is compact. Therefore, the arrangement space can be reduced as compared with the conventional merged pipe structure (or horizontal merged pipe) having one long inclined portion.

  The cross-sectional shape of the connecting pipe section from the vertical straight pipe section to the horizontal straight pipe section is usually a circle, but in FIG. 1, the distance between the axes X1 and X3 can be increased by making it an elliptical shape that is long in the vertical direction with respect to the paper surface. Without changing, the distance from the axis X1 to the end of the vertical straight pipe can be reduced. The short diameter of the ellipse is smaller than the original circle diameter, but in the case of different diameters, the long diameter of the ellipse can be increased to the diameter of the drainage horizontal main pipe, so the cross-sectional area can be made larger than the original circle. .

(Example)
FIG. 5 shows an example of test piping according to an embodiment of the present invention. The joining joint T used in the embodiment is the joining joint shown in FIGS. 1 to 3 in the first embodiment, and the joining joint shown in FIG. 6 in the second embodiment. This is the length of the tongue-shaped end portion 3c from FIG. It is a confluence joint with a long length and a confluence opening portion that is relatively small. A comparative example is the junction joint shown in FIG. 7, and has a conventional structure. FIGS. 6 (1) and 7 (1) are transverse sectional views, and FIGS. 6 (2) and 7 (2) are longitudinal sectional plan views.

  In the test, the drainage standpipe P3 and the drainage side branch pipe P2 are directly connected to the drainage horizontal main pipe P1, and the drainage load is applied from the illustrated arrow of each drainage standpipe P3 at the same position on the main pipe side and the branch pipe side. In-pipe pressures at pressure Pa1 (main pipe side) and pressure Pa2 (branch pipe side) are measured. Further, the water level in the pipe at the junction was visually observed just above the junction on the drainage horizontal main pipe side. The results are shown in FIGS. 8A and 8B show the comparative example, FIG. 8B shows the first embodiment, and FIG. 8C shows the second embodiment. FIG. 9 shows the results for the pipe pressure, and the reference numerals (a), (b), and (c) are the same as those in FIG.

According to the results of the water level in FIG. 8, according to the first and second embodiments of the present invention, in the region where the total flow rate of the main pipe and the branch pipe is relatively high, particularly in the region where the flow rate on the branch pipe side is high (lower left area from the thick line) It can be seen that the rise in water level is suppressed. On the other hand, in the case of the comparative example, the drainage flow is not bent. Rather, as shown in the plan view of FIG. 7, the vertical straight pipe portion and the horizontal straight pipe portion communicate with each other so that the drainage flows directly merge. For this reason, it is considered that there are many water-filled areas.
Moreover, although the amount of penetration into the horizontal straight pipe part 1 of the partition part of Example 1 and 2 (10% of the horizontal straight pipe part inner diameter) is the same, Example 2 has a longer projection amount than Example 1, It extends beyond the inner diameter of the vertical straight pipe portion 2. When both were compared, it turned out that the direction of Example 1 with a short protrusion amount can suppress a water level rise more.

  Further, according to the result of the pressure in the pipe of FIG. 9, when focusing on the pressure in the pipe measured by the pressure sensor (Pa1) installed on the side of the drainage horizontal main pipe, the maximum value is shown in Examples 1 and 2 relative to It can be seen that the pressure value when the drain side branch pipe side flow rate is large is smaller than that of the comparative example. Although a part of the reverse is seen in Example 1, since it is not extremely large, it can be suppressed as a whole against the positive pressure, and it can be said that it is superior to the comparative example. Moreover, in Example 1 where the tongue-like end portion 3c is short, it can be seen that the pressure is further lowered, which is more preferable. Moreover, in FIG. 9, the area | region where the total flow volume of a main pipe and a branch pipe is the same on the basis of 400 Pa is divided | segmented with the thick line. When attention is paid to this area, the left side of the bold line indicates the allowable drainage amount. Since the flow rate of Example 1 is about 2 L / s (2 liters per second) as compared with Comparative Example and Example 2, It is advantageous.

As mentioned above, although the confluence | joint joint concerning this Embodiment was demonstrated, embodiment mentioned above shows an example of suitable embodiment of this invention, and this invention is not limited to it, The Various modifications can be made without departing from the scope of the invention. For example, it can be used for the junction connection portion of the offset portion.
Moreover, the horizontal drainage pipe connection method of connecting the drainage horizontal branch pipe and the drainage horizontal main pipe so that the fluid bends and flows stepwise toward the downstream side of the drainage horizontal main pipe may be used.

It is a cross-sectional top view of the confluence | merging joint concerning this Embodiment. It is AA sectional drawing in FIG. It is a left view of the horizontal straight pipe part in FIG. It is a system configuration figure showing an outline of a drainage system. It is a system block diagram which shows test piping. The merge joint of this invention concerning Example 2 is shown, (1) is a cross-sectional view, (2) is a longitudinal cross-sectional top view. The conventional joining joint which is a comparative example is shown, (1) is a cross-sectional view, (2) is a longitudinal cross-sectional plan view. It is the result of having measured the water level in the example of test piping. (A) shows a comparative example, (b) shows Example 1, and (c) shows Example 2. It is the result of having measured the pressure in a pipe in the example of test piping. (A) shows a comparative example, (b) shows Example 1, and (c) shows Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Horizontal straight pipe part 1a ... Main pipe connection part 2 ... Vertical straight pipe part 2a ... Branch pipe connection part 3 ... Communication pipe part 3a ... 1st side wall 3b ... 2nd side wall 3c ... End part (Horizontal straight pipe of 1st side wall) 3d ... End (parallel end of the second side wall on the vertical straight pipe side) 3e ... C-shaped side wall 3f ... Partition P1 ... Drainage horizontal main pipe P2 ... Drainage horizontal branch pipe P3 ... Drainage standpipe P4 ... Device drainage horizontal branch pipe Y1 ... Junction opening (joining part of connecting pipe part and horizontal straight pipe part) Y2 ... Vertical straight pipe part opening X1-X4 ... Axis

Claims (7)

A joint for connecting a drainage horizontal branch pipe and a drainage horizontal main pipe,
A merging joint, characterized in that a flow path is formed in which the fluid flowing from the drainage horizontal branch pipe is bent stepwise toward the downstream side of the drainage horizontal main pipe and merged with the drainage horizontal main pipe. A horizontal straight pipe portion connecting the drainage horizontal main pipes at both ends;
A vertical straight pipe section for connecting the drainage horizontal branch pipe that is piped in a direction orthogonal or substantially orthogonal to the horizontal straight pipe section;
The merging joint according to claim 1, further comprising a connecting pipe part formed so as to communicate the horizontal straight pipe part and the vertical straight pipe part, and the flow path is formed. The connecting pipe portion is formed in a substantially convex curved shape so as to be opposed to the first side wall formed in a substantially concave curved shape at a predetermined interval in a transverse plan view of the junction joint. The second side wall is formed so as to connect the horizontal straight pipe portion and the vertical straight pipe portion,
A parallel portion is formed such that an end portion of the first side wall on the horizontal straight pipe portion side and an end portion of the second side wall on the vertical straight pipe portion side are parallel or substantially parallel,
The merging joint according to claim 2, further comprising an inclined portion that joins the second side wall continuous with the parallel portion so as to incline to the horizontal straight pipe portion.   A partition portion for partitioning the vertical straight pipe portion and the horizontal straight pipe portion is formed from an end portion of the first side wall on the horizontal straight pipe portion side to an inclined portion of the second side wall. The merging joint according to claim 3.   The partition portion has a tongue-like end on the horizontal straight pipe portion side of the first side wall in a cross-sectional plan view of the junction joint, and is substantially C-shaped over an inclined portion of the second side wall in a vertical plan view. The merging joint according to claim 4, wherein the merging joint has a shape of a side wall.   6. The junction joint according to claim 4, wherein the partition portion extends so as to slightly enter the horizontal straight pipe portion. A drainage standpipe, a drainage horizontal branch pipe, and a drainage horizontal main pipe,
The drainage system, wherein the drainage horizontal branch pipe and the drainage horizontal main pipe are connected using the junction joint according to any one of claims 1 to 6.

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