JP2009197575A - Two-stage type junction joint body structure for vertical drain pipe - Google Patents

Abstract

There is no backflow of drainage to a branch pipe of a lower branch pipe connection port of a junction joint having upper and lower two-stage branch pipe connection ports, the diameter of the upper and lower branch pipe connection ports, the vertical distance, Provided is a joint body structure in which the number of pipes and the like can be arbitrarily set 3 and a plurality of lower branch pipe connection ports are provided adjacent to each other at an angle of about 90 degrees in the circumferential direction of the joint body, and the joint body is vertically located at the middle part of the upper and lower branch pipe connection ports. In the upper joint member 8, in the two-stage merging joint body provided with a guide pipe 10 for guiding drainage and provided with a turning guide 13 below the branch pipe connection port of the lower joint member 9, An adjustment pipe 14 for adjusting the vertical distance of the upper and lower branch pipe connection ports is interposed between the joint members. FIG. 4

Description

  The present invention is a main body of a joint for connecting a plurality of horizontal branch pipes to a drainage vertical pipe, and is a two-stage junction joint for drainage vertical pipes of a type in which a plurality of horizontal branch pipes are connected in two upper and lower stages. It relates to the structure of the main body.

  Traditionally, fire-resistant double-layer pipes have been used for drainage vertical pipes in apartment buildings, hotels, hospitals, etc., and drainage vertical pipes are used to join the wastewater flowing through the horizontal branch pipes from kitchens, baths, toilets, etc. on each floor. A fireproof two-layer pipe joint is provided in the middle of the above. Fire-resistant double-layer pipes and fire-resistant double-layer pipe joints are usually constructed by covering the rigid PVC joint body with fiber-mixed mortar, and in the event of a fire, the mortar coating protects the PVC joint body. This prevents the fire damage from reaching other floors through the drain pipe.

  For example, in the case of a toilet, the height of the horizontal branch pipe varies depending on the toilet structure. A two-stage branch pipe connection port refractory two-layer pipe joint where a branch pipe connection port having a height different from that of the branch pipe connection port is separately used. In addition, drainage capacity is improved when draining drainage flows along the inner surface of the drainage vertical pipe.Therefore, a guide pipe for diffusing drainage to the inner surface of the joint body is provided, and a swivel guide is provided inside the joint. It is provided to swirl the drainage, and the drainage discharged from the joint flows spirally while swirling along the inner surface of the vertical pipe, thereby forming an air core in the drainage vertical pipe to increase drainage capacity. (See JP 2001-26955 A).

  In order to facilitate the manufacture of the joint body that constitutes a refractory two-layer pipe joint with a two-stage branch pipe connection port, it is manufactured separately at the middle part of the upper and lower branch pipe connection ports, and these are connected. After that, mortar coating is applied to produce a two-stage fireproof double-layer pipe joint.

  In addition, if the upper and lower branch pipe connection ports are provided on opposite sides facing each other, part of the drainage flowing from the upper branch pipe connection port may flow backward to the lower branch pipe connection port. In order to prevent this, it has also been proposed to provide a protruding portion protruding into the joint main body above the lower branch pipe connection port (see Japanese Patent Application Laid-Open No. 2003-232062).

Recently, the number of horizontal branch pipes in the same level has been increasing, and for example, it is desired to provide three or four lower branch pipe connection ports. However, when such a joint having a plurality of lower branch pipe connection ports is used, when there is no inflow of drainage from the lower branch connection port, the drainage flowing through the vertical pipe or the upper branch pipe connection port The inconvenience that the drained wastewater flows back to the lower branch pipe connection port was observed. This will be explained based on the joint body 1 provided with three lower branch pipe connection ports 2 as shown in FIG. 1 and drained from the toilet 4 connected to the upper branch pipe connection port 3 via the branch pipe 20. Flows into the branch pipe 20 of the adjacent branch pipe connection port 2b from the upper side of the branch pipe connection port 2a, and there is drainage from the vertical pipe 6 as shown in FIG. When the drainage from the connection port 3 is merged, it flows backward to both the adjacent branch pipe connection ports 2b and 2c, and also in the case of drainage from only the vertical pipe 6 as shown in FIG. The pipe connection ports 2b and 2c sometimes flow backward to the branch pipe 20.
JP 2003-232062 A JP 2001-26955 A

  It is an object of the present invention to eliminate the inconvenience of the junction joint having the upper and lower two-stage branch pipe connection ports, and there is no backflow of drainage to the branch pipes connected to the lower branch pipe connection ports. The present invention proposes a joint body structure in which the diameter of the upper and lower branch pipe connection ports, the vertical distance, the number of branch pipes, and the like can be arbitrarily set.

  In the present invention, in order to solve the above-mentioned problem, a vertical pipe connection port for connecting a drainage vertical pipe is provided at both upper and lower ends of a cylindrical joint body, and two upper and lower stages for connecting a lateral branch pipe to a side surface. A plurality of lower branch pipe connection ports are provided adjacent to each other at an angle of about 90 degrees in the circumferential direction of the joint body, and the joint body has two upper and lower branch pipe connection ports. The upper joint member and the lower joint member are separated at an intermediate portion of the upper joint member, and in the upper joint member, a guide pipe for guiding drainage from the vertical pipe connection port at the upper end is provided, and below the lower joint member, Adjusts the vertical distance of the upper and lower branch pipe connection ports between the upper and lower joint members in a two-stage joint joint body with a lower connection cylinder provided with a swivel guide on the inner surface that turns the drainage. An adjusting pipe to be interposed was interposed. By changing the dimensions of the adjustment pipe, the vertical distance between the upper and lower branch pipe connection ports can be changed, and the piping design can be made relatively freely. The relative positional relationship between the upper and lower branch pipe connection ports Can also be adjusted arbitrarily.

  Further, of the upper and lower two-stage branch pipe connection ports, the upper edge of the circular arc projecting into the cylinder of the joint body, and the joint hanging downward from the upper edge and above the opening of the lower branch pipe connection port By providing a backflow prevention guide consisting of a bowl-shaped front plate having a concave surface along the inner surface of the main body, it becomes possible to prevent backflow by slightly reducing the flow area of the joint body, and the flow area can be increased. The drainage capacity is improved.

  By forming the inner surface of the guide pipe as a vertical inner surface and guiding the drainage flowing down while turning from the vertical pipe connection port at the upper end to hit the inner surface of the joint body at a position below the lower branch pipe connection port It is possible to prevent the waste water flowing from the vertical pipe from flowing backward to the lower branch pipe connection port.

  A more effective configuration is a second induction pipe in which the pipe diameter of the adjustment pipe is formed smaller than the pipe diameter of the upper joint member, and the lower part thereof is extended into the lower joint member to induce drainage from the upper joint member. By doing so, the change in drainage capacity accompanying the change in the amount of inflow from the branch pipe connection port can be reduced, and since it is not necessary to provide a backflow prevention guide, the manufacture of the lower joint member is facilitated. Further, by providing a backflow control plate extending in the vertical direction on the inner surface of the lower joint member and in the middle portion of the adjacent branch pipe connection ports, the manufacture becomes easy, and the upper joint member is By forming and using the same shape as the joint member, the manufacturing cost is reduced.

  Another more effective configuration is to form a bowl-like tongue piece projecting into the tube of the joint body at the bottom of the opening of the upper branch pipe connection port, and this tongue piece is connected to the upper branch pipe connection. Even when the flow of water flowing into the joint from the opening weakens, the drainage is guided to discharge far away, and the drainage flows down along the inner surface of the second guide pipe. It becomes difficult for the drainage to hit directly to the mouth, and backflow there can be prevented. In addition, by forming both end faces of the bowl-shaped tongue piece on the slope inclined downward, the flow resistance of the drainage in the cylinder is reduced, and at the same time, the solid matter in the drainage is prevented from being caught by the tongue piece. it can.

  Another effective configuration is to cut the lower end portion of the upper joint member to shorten the length of the upper joint member and connect the lower end portion to the adjustment pipe so that the upper and lower branches of the upper and lower branch pipe connection ports In this case, there is an advantage that fine adjustment more than the size that can be adjusted by the adjusting pipe can be easily performed, and it is not necessary to prepare many kinds of adjusting pipes.

  The main body of the two-stage merging joint according to the present invention is such that the adjusting pipe is provided between the separated upper joint member and the lower joint member, so that the upper and lower two-stage branch pipe connection can be achieved simply by changing the length of the adjusting pipe. Since the upper and lower distances of the mouth can be changed and the upper joint member can be swung horizontally with respect to the lower joint member, the relative positional relationship between the upper and lower branch pipes can be arbitrarily changed. The degree of freedom in piping design increases.

  Of these two upper and lower branch pipe connection ports, an arcuate upper edge projecting into the cylinder of the joint body above the opening of the lower branch pipe connection port where drainage may flow backward, and the upper edge In addition to preventing backflow to the lower branch pipe connection port, it also flows down by providing a backflow prevention guide comprising a bowl-shaped front plate having a concave surface along the inner surface of the joint body. The collision between the drainage and the backflow prevention guide is reduced, and the drainage capacity is improved accordingly.

  Conventionally, the guide pipe provided at the vertical pipe connection port at the upper end has guided the wastewater flowing from the vertical pipe into the joint body to the inner surface of the joint body, and then placed it on the swivel guide to create a swirl flow to create air in the joint. It is provided to secure the core, and the inner surface of the guide tube is formed so as to spread in a trumpet shape. However, when there are branch pipe connection ports in the upper and lower two stages, the drainage is guided toward the inner surface. There was a case where the reflected drainage water collided with the backflow prevention guide at the lower branch pipe connection port and flowed back to the adjacent branch pipe connection port. However, in the present invention, the inner surface of the guide tube is formed as a vertical inner surface, and the drainage is guided to the inner surface of the joint body at a position below the lower branch pipe connection port and above the turning guide. Therefore, the point where the drainage water flowing into the joint body spreads can be lower than the lower branch pipe connection port, and as a result, it prevents collision with the backflow prevention guide and prevents backflow to the adjacent branch pipe connection port. become able to.

  The adjustment pipe has a shape in which the pipe diameter is smaller than that of the upper joint member, and a lower guide pipe extends to the inside of the lower joint member to provide a second guide pipe for inducing drainage from the upper joint member. Then, since it is not necessary to provide a complicated backflow prevention guide above the opening of the branch pipe connection port of the lower joint member, the manufacture becomes easy and can be manufactured at low cost. Furthermore, a lower joint member made of a separate member is attached to the lower joint member, and a reverse flow control plate extending in the vertical direction is provided at an intermediate portion between adjacent branch pipe connection ports of the lower joint member, so that the lower joint member can be easily manufactured. Thus, by forming the upper joint member in the same shape as the lower connection member and using it together, the production cost of the merge joint is further reduced.

  When the water flow flowing into the joint from the upper branch pipe connection port is weakened by forming a bowl-like tongue piece protruding into the cylinder of the joint body at the bottom of the opening of the upper branch pipe connection port. However, the tongue piece guides the drainage to discharge far away, and the drainage flows down along the inner surface of the second guide pipe, so that it is difficult for the drainage to hit directly to the branch pipe connection port at the lower position. Backflow to the branch pipe connection port can be prevented. By forming both end surfaces of the bowl-shaped tongue pieces on slopes inclined downward, the flow resistance of the drainage in the cylinder is reduced, and at the same time, solid matter in the drainage is hardly caught on the tongue pieces.

  Cut the upper joint member by cutting the lower end part to shorten the length of the upper joint member and connecting the lower end part to the adjustment pipe to adjust the vertical distance of the upper and lower branch pipe connection ports. Since the length can be set as much as necessary, there is an advantage that fine adjustment more than the size that can be adjusted by the adjusting pipe can be easily performed, and it is not necessary to prepare many kinds of adjusting pipes.

  The embodiment of the present invention will be described with reference to FIGS. 4 to 12 of the attached sheets. In FIGS. 4 to 6, reference numeral 1 denotes a cylindrical joint body made of rigid polyvinyl chloride, 2a, 2b, 2c, 90 degrees. The lower branch pipe connection port 3 provided at an angle of 3 is an upper branch pipe connection port. The lower branch pipe connection port 2 is connected to a kitchen, a bath, a washroom, and the like through a branch pipe 20, and the upper branch pipe connection port 3 is connected to a toilet through the branch pipe. Longitudinal pipe connection ports 7a and 7b for connecting the longitudinal pipe 6 are provided at the upper and lower ends of the joint body 1 in the same manner as the conventional one. The joint body 1 is manufactured in a state in which it is separated into an upper joint member 8 and a lower joint member 9 at an intermediate portion between the upper branch pipe connection port 3 and the lower branch pipe connection port 2. This is clearly shown in FIG. The upper joint member 8 is integrally attached with an upper connection cylinder 11 integrally formed with a vertical pipe connection port 7a at the upper end and a guide pipe 10 for guiding drainage flowing into the upper joint member 8. A funnel-shaped lower connection cylinder 12 having a vertical pipe connection port 7b is attached by adhesion, and the drainage flowing down through the inner wall as shown in FIG. The turning guide 13 was provided. The lower edge of the guide pipe 10 is extended to the extent that it opposes the upper part of the opening of the upper branch pipe connection port 3, and the drainage that has passed through the guide pipe 10 flows downward without flowing back to the branch pipe connection port 3. I tried to do it.

  The upper and lower distances of the upper and lower branch pipe connection ports 2 and 3 are determined by the position of the drain outlet of the equipment connected to the branch pipes and the building structure. It is difficult to manufacture a variety of joint bodies 1. In the case of the present invention, in order to solve such difficulties, an adjusting pipe 14 as clearly shown in FIG. 10 is interposed between the upper joint member 8 and the lower joint member 9. A plurality of types are produced by changing the dimension 15 of the step portion of the adjustment pipe 14, and the adjustment pipe 14 having a dimension 15 adapted to the desired vertical distance is selected to select between the upper joint member 8 and the lower joint member 9. By interposing it in the joint body, it is possible to easily manufacture the joint body 1 suitable for the distance, and the degree of freedom in piping design is increased.

  When a plurality of lower branch pipe connection ports 2 are provided at intervals of 90 degrees around the joint body 1 as shown in the drawing, the adjacent branch pipe connection ports 2 are connected to the adjacent branch pipe connection ports 2 from above as shown in FIGS. Although there was an inconvenience that the drainage flows backward, in the present invention, it can be seen in FIGS. 7 and 11 above the opening of the lower branch pipe connection port 2 among the upper and lower branch pipe connection ports 2 and 3. A backflow prevention comprising an arcuate upper edge 16 projecting into the cylinder of the joint body 1 and a bowl-shaped front plate 17 having a concave surface extending downward from the upper edge 16 and extending along the inner surface of the joint body 1. A guide 18 was provided to prevent backflow of drainage. When drainage flows from the upper branch pipe connection port 3, the drainage hits the upper edge 16 of the backflow prevention guide 18 of the lower branch pipe connection port 2 and rebounds in the direction of the other adjacent branch pipe connection port 2. The flow bounced off by the front plate 17 provided in the opening is interrupted and can be prevented from flowing back into the branch pipe connection port 2. In addition, when drainage is flowing through the lower branch pipe connection port 2, it is pushed by the flow, so there is no backflow of drainage from above, and the flow from the branch pipe connection port 2 is not hindered.

  The drainage flowing through the drainage vertical pipe 6 is swung by the swivel guide 13 provided in the joint body 1, so that it flows along the inner surface and flows into the joint body 1 of the next floor while turning. The pipe 10 controls the spreading of swirling drainage from the vertical pipe 6. The inner surface of the guide pipe 10 is formed in a trumpet shape that is somewhat divergent as in the prior art, and an attempt was made to guide the drainage toward the inner surface of the joint body 1. When the branch pipe connection port is provided in the step, since the unevenness such as the opening increases on the lower inner surface of the joint body 1, the drainage does not flow smoothly along the inner surface when drainage flows from the branch pipe, The drainage capacity may be reduced. Therefore, the inner surface of the guide tube 10 is formed as a vertical inner surface so that the waste water hits the inner surface of the branch pipe body at a position below the lower branch pipe connection port 2 and above the turning guide 13, for example, at position 19. Induced to. In this way, the wastewater flowing in from the vertical pipe 6 is allowed to diffuse along the inner surface by the centrifugal force of the wastewater without colliding with the branch pipe connection port 2 and then swiveled by the turning guide 13. Since the flow is orderly, the drainage capacity has been improved, and the drainage capacity has been improved by about 27%. Specifically, the joint main body 1 having an inner diameter of the vertical pipe connection port 7b at the lower end of 100 mm is 5.5 liters when the drainage is poured from the vertical pipe 6 and the four branch pipe connection ports 2 and 3 in the conventional case. However, in the configuration of FIG. 4 of the present invention, a drainage capacity of 7 liters / second was obtained.

  The joint body 1 of the present invention joins the upper connecting tube 11 having the configuration shown in FIG. 8 to the upper joint member 8 with an adhesive, and joins the lower connecting tube 12 to the lower joint member 9 with an adhesive. After covering the outer periphery of the adjustment pipe 14 with fiber-mixed mortar, the upper joint member 8, the lower joint member 9, and the adjustment pipe 14 are joined with an adhesive according to the piping design, and configured as a fireproof two-layer pipe joint. By preparing several types of joint bodies 1 with different diameters and several types of adjustment pipes 14 having different lengths, the joint body 1 corresponding to various piping designs can be quickly and inexpensively prepared. Since it can be manufactured, a fireproof two-layer pipe joint can be provided quickly and inexpensively.

  Another embodiment of the present invention will be described with reference to FIGS. In this example, the pipe diameter of the adjusting pipe 14 is made smaller than the pipe diameter of the upper joint member 8, and the lower part thereof is extended into the lower joint member 9, and this extended portion is guided to drainage from the upper joint member 8. The second guide pipe 22 is extended to the front of the branch pipe connection ports 2a, 2b, and 2c, so that the drainage from the upper joint member 8 is allowed to flow through the lower joint member 9. Backflow to the branch pipe connection ports 2a, 2b, and 2c can be prevented. In this case, since it is not necessary to provide the backflow prevention guide 18 as in the example of FIG. 4 at the branch pipe connection port 2, the structure of the lower joint member 9 is simplified. Further, the structure of the adjusting pipe 14 is relatively simple and easy to manufacture, and various pipe designs can be accommodated by preparing various types by changing the dimension 15.

  The lower joint member 9 and the lower connection cylinder 12 provided with the turning guide 13 are manufactured as separate members, and are the inner surfaces of the lower joint member 9 and adjacent branch pipe connection ports 2a, 2b, 2c. Since the rib-shaped back flow control plate 23 extending in the vertical direction is provided in the middle part, when a large amount of drainage flows from one branch pipe, it collides with falling drainage or the lower part of the second guide pipe 22 Since the reflected flow that collides with the reverse flow can be prevented from flowing back to the adjacent branch pipe connection port 2, the upper joint member 8 and the lower joint member 9 are different only in the number of branch pipe connection ports. The lower joint member 9 can be diverted instead of the upper joint member 8 shown in FIG. 13, and it is not necessary to manufacture the upper joint member 8, so that the joint body can be manufactured at a lower cost. Reference numeral 24 denotes a stepped portion that receives the lower end of the second guide tube 22.

  When the drainage flow from the upper branch pipe connection port 3 becomes weak, it is considered that the water flow hitting the inner surface of the upper joint member 8 hits the lower edge of the opening of the branch pipe connection port 2b of the lower joint member 9 until then. In this case, the drainage is reflected and flows back into the branch pipe connection port 2b, which is not preferable. However, the bowl-shaped tongue piece as shown in FIGS. 17 to 20 is formed in the opening of the upper branch pipe connection port 3. By forming 30 so as to protrude into the cylinder of the upper joint member 8, even when the momentum of the drainage is weakened, it can be guided so as to hit the inner wall surface of the second guide pipe 22, and the drainage follows the inner wall surface. Therefore, it does not hit the lower edge of the branch pipe connection port 2b, and backflow can be prevented. In this case, by forming both end faces 31, 31 of the tongue piece 30 on slopes inclined downward, the flow resistance of the drainage is reduced, and the solid matter mixed in the drainage is not caught.

    In the above example, the vertical distance between the upper and lower branch pipe connection ports 2 and 3 is limited to a distance corresponding to the length of the adjustment pipe 14, but the lower end portion 8 a of the upper joint member 8 is cut. The upper and lower distances can be finely adjusted by shortening the overall length of the upper joint member and connecting the lower end portion 8a to the adjusting pipe. Thereby, it becomes possible to cope with various distances without preparing many kinds of adjusting pipes 14.

  Since the joint body 1 of the present invention is made of a synthetic resin and has poor fire resistance, the peripheral surface of the joint body is usually coated with fiber-mixed mortar as described above, and is treated to withstand a fire. Provided as a fitting.

Explanatory drawing of the backflow state by drainage from the upper branch port connection port of the conventional joint member Explanatory drawing of the backflow state at the time of the drainage merge from the drainage vertical pipe of the conventional joint member and the upper branch pipe connection port Explanatory drawing of the backflow state by the drainage from the drainage vertical pipe of the conventional joint member Cut side view of an embodiment of the present invention Sectional drawing of the 5-5 line part of FIG. Sectional view taken along line 6-6 in FIG. Sectional view taken along line 7-7 in FIG. Expanded cross section of upper connection tube Expanded cross section of upper joint member Expanded sectional view of the adjustment pipe Expanded sectional view of the lower joint member Expanded sectional view of the lower connection tube Cut side view of another embodiment of the present invention Cross section of the second guide tube Sectional drawing of the lower joint member of FIG. Sectional view taken along line 16-16 in FIG. The top view of the principal part of the further another Example of this invention. FIG. 17 is a cut perspective view. 17 is a longitudinal sectional view of FIG. Cross-sectional view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Joint main body, 2, 2a, 2b, 2c Lower branch pipe connection port, 3 Upper branch pipe connection port, 6 Drainage vertical pipe, 7a, 7b Vertical pipe connection port, 8 Upper joint member, 9 Lower joint member, 10 Guide tube, 11 Upper connection tube, 12 Lower connection tube, 13 Turning guide, 14 Adjustment tube, 16 Arc-shaped upper edge, 17 Front plate, 18 Backflow prevention guide, 20 Branch tube, 22 Second induction tube, 23 Backflow control Plate, 30 tongue, 31 end face

Claims (9)

  A vertical pipe connection port for connecting a drainage vertical pipe to the upper and lower ends of a cylindrical joint body, and a branch pipe connection port displaced in two upper and lower stages for connecting a horizontal branch pipe on the side surface, A plurality of branch pipe connection ports are provided adjacent to each other at an angle of about 90 degrees in the circumferential direction of the joint main body, and the joint main body is an upper joint member and a lower joint member at an intermediate portion between the upper and lower branch pipe connection ports. The upper joint member is provided with a guide pipe for guiding the drainage from the vertical pipe connection port at the upper end, and a swivel guide for turning the drainage is provided on the inner surface below the lower joint member. In the two-stage merging joint body with the lower connecting cylinder attached, an adjustment pipe for adjusting the vertical distance of the upper and lower branch pipe connection ports is interposed between the upper and lower joint members. The structure of the two-stage confluence joint body for the drainage vertical pipe.   Of the upper and lower two-level branch pipe connection ports, the upper edge of the arc shape projecting into the cylinder of the joint main body above the opening of the lower branch pipe connection port, and the joint main body hanging downward from the upper edge 2. The structure of a two-stage confluence joint main body for drainage vertical pipes according to claim 1, wherein a backflow prevention guide comprising a bowl-shaped front plate having a concave surface along the inner surface is provided.   The inner surface of the guide pipe is formed as a vertical inner face, and the drainage flowing down while turning from the vertical pipe connection port at the upper end is located below the lower branch pipe connection port and at a position above the turning guide. The structure of the two-stage confluence joint main body for a drainage vertical pipe according to claim 1 or 2, wherein the structure is guided so as to hit the inner surface of the drainage vertical pipe.   A pipe diameter of the adjustment pipe is formed to be smaller than a pipe diameter of the upper joint member, and a lower part thereof is extended into the lower joint member to form a second induction pipe that guides drainage from the upper joint member. The structure of the two-stage type joint body for a drainage vertical pipe according to claim 1.   The two-stage confluence joint main body for drainage vertical pipes according to claim 1, wherein a backflow control plate extending in the vertical direction is provided on an inner surface of the lower joint member and in an intermediate portion between adjacent branch pipe connection ports. Structure.   2. The structure of a two-stage joint joint body for a drainage vertical pipe according to claim 1, wherein the upper joint member is formed in the same shape as the lower joint member.   5. A two-stage confluence joint body for a drainage vertical pipe according to claim 4, wherein a bowl-like tongue piece projecting into the tube of the joint body is formed at the bottom of the opening of the upper branch pipe connection port. Structure.   8. The structure of a two-stage confluent joint body for drainage vertical pipes according to claim 7, wherein both end faces of the bowl-like tongue piece are formed on slopes inclined downward to reduce drainage resistance. .   Cutting the lower end portion of the upper joint member to shorten the length of the upper joint member, and adjusting the vertical distance of the upper and lower branch pipe connection ports by connecting the lower end portion to the adjustment pipe. The structure of the two-stage joint joint body for a drainage vertical pipe according to claim 1,

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