JP2011179273A - Drain pipe facility of two-storied multiple dwelling house, and multi-opening pipe joint used in the drain pipe facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a drain pipe facility which, when a large amount of drainage flows in from drain appliances in a two-storied multiple dwelling house, discharges the drainage smoothly, and whose drain trap of each drain appliance is hard to be broken, without providing a particular air ventilation device such as a vent pipe or a vent valve. <P>SOLUTION: A plurality of horizontal branch drain pipes 13a, 13b, 23a, 23b connected to the respective drain appliances such as a kitchen sink, a bath room, a washing stand, are arranged on the under-floor spaces UF1, UF2 of a first and a second floors, and are connected to horizontal branch receiving ports 33, 35 provided on the outer circumference of the barrel parts 39 of the first multi-opening pipe joint 11 and the second multi-opening pipe joint 21. The barrel part 39 is straight and larger in its diameter than a drain riser 15 interposed between a first multi-opening pipe joint 11 and a second multi-opening pipe joint 21, and larger in the diameter of a horizontal main pipe 17 than the drain riser 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a drainage pipe facility for a two-story apartment house and a multi-port pipe joint used for the drainage pipe facility.

  Conventionally, the drainage pipe facilities of a two-storied apartment house have a kitchen sink, a bathroom or a wash basin, etc. installed in each dwelling on the second floor. It is generally connected to the middle of the drainage horizontal branch pipe, and the drainage (equipment wastewater) discharged from multiple drainage devices is joined by the drainage horizontal branch pipe and then flows into the drainage standpipe. there were. This is because the space under the floor on the second floor is small in the conventional two-storied apartment building, and the drainage gradient of the drainage horizontal branch pipe can be secured somehow. This is because the piping structure that joins the drainage horizontal branch pipes under the floor and flows into the drainage stack pipes through a more compact joint has been common sense in a two-story apartment house for many years.

  However, in such a piping configuration, the lower end of the drainage stand pipe is connected to the horizontal main pipe via a leg joint bent in an L shape, and the drainage that has flowed vertically through the drainage standpipe is suddenly dropped by the leg joint. The flow direction can be changed to the horizontal direction and led to the outside of the building. Therefore, if the amount of drainage (standpipe drainage) flowing down the drainage stack is too large, the drainage will temporarily stay at the bent part of the leg joint and block the pipe, and the pressure in the pipe will fluctuate rapidly. There was a problem that caused the drainage trap of the drainage device to break. In order to solve this problem, Japanese Patent Application Laid-Open No. H10-228561 proposes securing ventilation in the pipe by swirling the vertical drainage. According to such a technique, it is possible to solve the problem of breakage of the drain trap that occurs when the amount of the standing pipe drainage is too large without using a venting device such as a vent pipe or a vent valve.

JP 2003-342984 A

  However, in a conventional piping configuration in which a plurality of appliance drains are combined into a single drainage side branch pipe and then flowed into the drainage standpipe, a large amount of drainage flows from one drainage apparatus to the drainage side branch pipe. If it flows in, it will not be able to drain smoothly from other drainage devices, or a large amount of drainage will flow into the drainage side branch pipe at once, the drainage side branch pipe will be blocked and the pressure in the pipe will fluctuate rapidly, leading to induction There was a problem that the drainage trap of each drainage apparatus was caused by siphon action. Such a problem caused by the drainage horizontal branch pipe cannot be dealt with by the above-described conventional technology, and cannot be fundamentally solved as long as the above-described conventional piping configuration is adopted.

  Therefore, the present inventors have intensively studied to solve the problem caused by the drainage horizontal branch pipe. However, in a two-story apartment house, in order to solve the problem of noise and water leakage on the upper and lower floors. The architectural structure was changing, such as placing thin PC boards (precast concrete boards) between the first and second floors. As a result, although the space under the floor on the second floor is still limited, it tends to expand slightly compared to the past. The inventors of the present invention have focused on the space under the floor, which is slightly larger than the conventional one, and have conceived a new piping configuration that is completely unabated by the common sense of the piping structure of the conventional two-story apartment house. As a result, simultaneously solve the problem of drainage trap breakage that occurs when there is too much vertical drainage, and the problem of drainage trap breakage caused by a large amount of wastewater flowing into the drainage branch pipe at once. The drainage pipe equipment that can be constructed has been constructed without providing a special ventilation device such as a ventilation pipe or a ventilation valve.

  That is, the problem of the present invention is that in a two-story apartment building, a drain pipe facility that can smoothly drain even if a large amount of drainage flows from the drainage device, and that the drainage trap of each drainage device is not easily broken. Is configured without providing a special ventilation device such as a ventilation pipe or a ventilation valve.

In order to solve the above problems, the present invention employs the following means.
The present invention is a drainage pipe facility for a two-story apartment house, and includes a first multi-port pipe joint and a second multi-end pipe disposed in a space under the first floor and a space under the second floor. And a drainage standpipe interposed between the first multiport pipe joint and the second multiport pipe joint, and connected to a lower side of the first multiport pipe joint. The first multi-port pipe joint and the second multi-port pipe joint are provided with a plurality of side branch pipe receptacles capable of connecting drain side branch pipes to the outer periphery of the trunk portion thereof. In each of the spaces under the floors of the first floor and the second floor, a plurality of drainage side branch pipes to which a plurality of drainage devices such as a kitchen sink, a bathroom, and a wash basin are connected are arranged, and the first Of the first multi-port pipe joint and the second multi-port pipe joint. Barrel provided with the receptacle is a straight tube, the diameter is greater than the drainage vertical tube, said horizontal main pipe, the diameter being greater than said drainage vertical tube.

  According to such drain pipe equipment, one drainage device is basically connected to one drainage side branch pipe, and each drainage side branch pipe has a plurality of side branch pipe receiving ports. It is connected to each side branch pipe receptacle. Since one drainage device is basically connected to one drainage side branch pipe, in the drainage side branch pipe, there is no induction siphon action caused by the drainage of other drainage equipment (apparatus drainage). It is possible to prevent the drainage trap of the drainage device from being broken. Moreover, it can always drain smoothly in each drainage device, without being disturbed by other device drainage. In addition, a plurality of drainage side branch pipes can be connected at the same pipe bottom level in a multi-port pipe joint, and it is easy to ensure a drainage gradient of the drainage side branch pipes.

  In such a drainage pipe facility, each appliance drainage flows laterally in each drainage horizontal branch pipe, joins at a multi-port pipe joint, changes direction, and flows downward at a higher speed. Here, the trunk portion of the multi-mouth pipe joint to which the drainage horizontal branch pipe is connected is a straight pipe having a diameter larger than that of the drainage stack forming the downward drainage path, and therefore the drainage path is blocked by the inflowing drainage. It is difficult to suppress the pressure fluctuation in the pipe. The drained water that has flowed down is guided to the horizontal main pipe connected to the lower side of the first multi-port pipe joint, changes its direction in the horizontal direction, and flows at a reduced speed. Here, because the diameter of the horizontal main pipe that forms the horizontal drainage path ahead of the drainage stack that forms the downward drainage path is larger, the drainage changes direction in the horizontal direction and the speed decreases. However, the horizontal main pipe is not easily blocked by the drainage. Therefore, even if a large amount of drainage flows from the drainage device, it can be drained smoothly, and the drainage trap of each drainage device is difficult to break.

  Further, as a preferable multi-port pipe joint used in such drain pipe equipment, a straight tubular trunk having a plurality of side branch pipe receptacles on the outer periphery is provided, and drainage provided on one end side in the pipe axis direction of the trunk. A vertical tube receiving port through which the vertical tube can be inserted and connected, and a tubular portion extending in a straight tube having the same diameter as the cylindrical portion provided on the other end, and the tubular portion and the tubular portion The diameter of the portion is larger than the drainage standpipe connected to the standpipe receiving port, and the space under the floor on the second floor is arranged such that the tubular part is on the top and the standpipe receiving port is on the bottom. There is a multi-story pipe joint for a two-storied apartment house characterized in that the vertical pipe receiving port is on the bottom and the tubular part is on the bottom.

  According to this multi-port pipe joint, by turning upside down, it can be arranged in the space under the floor on the first floor or the space under the floor on the second floor. It can be used as a second multi-port pipe joint. Therefore, it can suppress that the kind of multi-mouth pipe joint increases. Moreover, the multi-port pipe joint arranged in the space under the floor on the first floor as the first multi-port pipe joint has a tubular portion on the bottom, and the conventional connection means is applied as it is to connect the pipes to each other. By doing so, it is possible to easily connect to the horizontal main pipe.

  According to the drainage pipe facility of the present invention, it is possible to smoothly discharge even if a large amount of drainage flows from the drainage device without providing a special ventilation device such as a ventilation pipe or a ventilation valve, and each drainage It can suppress that the drain trap of an instrument breaks.

It is a front view of the drain pipe equipment concerning the embodiment of the present invention. It is a top view of the multi-mouth pipe joint which concerns on embodiment of this invention. It is the III-III sectional view taken on the line of the multi-mouth pipe joint shown by FIG. It is the IV-IV sectional view taken on the line of the multi-mouth pipe joint shown in FIG. It is a front view of a closure lid of a multi-mouth pipe joint concerning an embodiment of the present invention.

  An embodiment of the present invention will be described with reference to the drawings. The drain pipe facility H1 of this embodiment shown in FIG. 1 is a drain pipe facility provided in a two-story apartment house. Although not shown in the figure, this apartment house is provided with a plurality of drainage devices such as a toilet, a kitchen sink, a bathroom, and a wash basin on each of the first and second floors. The floor FL1 on the first floor is formed by laminating a floor material 3 in which a floor material made of resin or the like is laminated on a plywood on an upper surface of a plywood 1 supported by joists (not shown). . In this specification, the space UF1 under the floor FL1 on the first floor is referred to as the space UF1 under the floor on the first floor. The floor FL2 on the second floor is formed by stretching the flooring 3 on the upper surface of the underlaying material 1 in the same manner as the floor FL1 on the first floor. And under that, the concrete board C is arranged at intervals. In this specification, the space UF2 between the floor FL2 on the second floor and the concrete plate C is referred to as a space UF2 below the floor on the second floor. An underlay material 5 is disposed on the lower surface of the concrete plate C, and a ceiling material on the first floor is supported although illustration is omitted.

  The drainage pipe facility H1 includes a first multi-port pipe joint 11 disposed in the space UF1 under the first floor and a second multi-port pipe joint 21 disposed in the space UF2 under the second floor. And a drainage stack 15 interposed between the first multi-port pipe joint 11 and the second multi-port pipe joint 21, and a leg joint 19 below the first multi-port pipe joint 11. And a plurality of horizontal drain pipes 13a, 13b, 23a, and 23b arranged in the spaces UF1 and UF2 below the first and second floors.

  The drainage horizontal branch pipes 13a, 13b, 23a, and 23b piped in the spaces UF1 and UF2 under each floor are connected to one drainage device installed on the floor, and the other end is connected to the floor. Are connected to the first multi-port pipe joint 11 or the second multi-port pipe joint 21. Accordingly, the drainage of each drainage device installed on the second floor flows through the drainage horizontal branch pipes 23a and 23b, joins at the second multi-port pipe joint 21 and flows down in the drainage stack 15, and The drainage that has flowed down and the drainage of each drainage device on the first floor that has flowed through the drainage horizontal branch pipes 13 a and 13 b merge at the first multi-port pipe joint 11. And it flows into the horizontal main pipe 17 connected to the lower side of the 1st multi-port pipe joint 11 via the leg joint 19 bent in the L shape, and is drained outside the building. Hereinafter, each member which comprises this drain pipe equipment H1 is demonstrated.

<About drainage horizontal branch pipes 13a, 13b, 23a, 23b>
The drainage horizontal branch pipes 13a, 13b, 23a, and 23b are basically connected to one drainage device at each end, and a drainage gradient is secured in the spaces UF1 and UF2 below the first and second floors. And it is piped in the horizontal direction (horizontal direction). Then, the other end is inserted into the side branch pipe receiving ports 33 and 35 of the first multi-port pipe joint 11 or the second multi-port pipe joint 21 to be inserted into the first multi-port pipe joint 11 or the second multi-port pipe. It is connected to the joint 21. As the drainage horizontal branch pipes 13a, 13b, 23a, and 23b, for example, hard vinyl chloride pipes can be used.

<About the drainage stack 15>
The drainage stack 15 is interposed between the first multi-port pipe joint 11 and the second multi-port pipe joint 21 and arranged vertically. As the drainage stack 15, for example, a straight tubular rigid polyvinyl chloride pipe can be used.

<About horizontal main pipe 17>
The horizontal main pipe 17 is piped in the horizontal direction while ensuring a drainage gradient in the space UF1 under the floor on the first floor, and one end of the horizontal main pipe 17 is connected to the lower side of the first multi-port pipe joint 11 via the leg joint 19. Has been. The horizontal main pipe 17 has a larger diameter than the drainage stack 15, and preferably the diameter of the horizontal main pipe 17 is 1.2 to 1.6 times the diameter of the drainage stack 15. In this embodiment, the nominal diameter of the drainage stack 15 is 75, whereas the nominal diameter of the horizontal main pipe 17 is 100, and a pipe whose nominal diameter is one size larger is used. As the horizontal main pipe 17, for example, a hard vinyl chloride pipe can be used.

<Regarding the leg joint 19>
The leg joint 19 that connects the horizontal main pipe 17 and the first multi-port pipe joint 11 is a joint that can connect pipes of the same diameter in an L shape. The leg joint 19 includes a tubular body portion 19a bent in an L shape, and includes receiving ports 19b and 19c that are expanded in diameter at both ends of the body portion 19a. The horizontal main pipe 17 is inserted and connected to one receiving port 19b, and the straight pipe portion 45 of the first multi-port pipe joint 11 described later is inserted and connected to the other receiving port 19c.

<About the first multi-port pipe joint 11 and the second multi-port pipe joint 21>
In the present embodiment, the first multi-port pipe joint 11 disposed in the space UF1 under the first floor and the second multi-port pipe joint 21 disposed in the space UF2 under the second floor have the same shape. The multi-mouth pipe joint 31 is turned upside down. First, the multi-port pipe joint 31 will be described.

  As shown as the second multi-port pipe joint 21 in FIG. 1, the multi-port pipe joint 31 is a side branch pipe receptacle 33 that can be connected by inserting straight tubular ends of the drainage side branch pipes 23a and 23b. 35 and 37 are provided. In the present specification, a portion where the lateral branch pipe receiving ports 33, 35, and 37 are provided in the pipe axis direction of the multi-mouth pipe joint 31 is referred to as a body portion 39. The body portion 39 has a straight tube shape, and the diameter thereof is equal to that of the horizontal main tube 17. A vertical tube receiving port 41 is provided on one end side in the axial direction across the body portion 39, and a straight pipe portion 45 is provided on the other end side. The standpipe receiving port 41 can be connected by inserting a drainage standpipe 15 having a diameter smaller than that of the body part 39, and is connected to the body part 39 via a taper part 43. As shown in FIG. 3, the straight pipe part 45 is a straight pipe obtained by extending the body part 39 with the same diameter, and the diameter thereof is equal to that of the horizontal main pipe 17. The length D in the tube axis direction of the straight pipe portion 45 is at least a length that can be inserted into and connected to the receiving port 19c of the leg joint 19 described in detail later. In the present embodiment, the length D in the tube axis direction of the straight tube portion 45 is 50 mm.

  Side branch pipe receptacles 33, 35, and 37 are provided in the body 39 of the multi-mouth pipe joint 31 of the present embodiment in three directions around the pipe axis. In this multi-port pipe joint 31, the side branch pipe receiving ports 33, 35 are orthogonal to the side branch pipe receiving ports 33, 35 positioned opposite to each other, and the side branch pipe receiving ports 37 facing the inner wall surface are arranged. The size is such that a large drainage horizontal branch pipe can be connected. In the present embodiment, specifically, the side branch pipe receiving ports 33 and 35 correspond to a drainage side branch pipe having a nominal diameter 50 and the side branch pipe receiving port 37 corresponds to a nominal diameter 75. Each side branch pipe receiving port 33, 35, 37 is provided at the same level at the end of the vertical tube receiving port 41 side in the tube axis direction. Due to the size setting of the horizontal branch pipe receptacles 33, 35, and 37, the multi-mouth pipe joint 31 mainly includes a kitchen sink, a bathroom, a wash basin, and the like. While a drainage device for miscellaneous drainage is connected, a toilet can also be connected to the side branch pipe receiving port 37 facing the inner wall surface. As shown in FIG. 2, a pair of inflow prevention walls 47a and 47b projecting inward of the pipe are provided on the inner wall surface facing the side branch pipe receiving port 37 corresponding to the relatively large-diameter drainage side branch pipe. It has been. As shown in FIG. 4, the inflow prevention walls 47a and 47b are provided so as to extend in the tube axis direction on both sides of the side branch pipe receiving port 37 projected on the inner wall surface facing the side branch pipe receiving port 37. The horizontal branch pipe receiving port 37 extends from the upper end position to below the lower end position. Due to the inflow prevention walls 47a and 47b, when a large amount of wastewater flows in from the side branch pipe receiving port 37 and collides with the inner wall surface facing the side branch pipe receiving port 37, the drainage branches right and left along the inner wall surface. Thus, it is possible to prevent backflow to the lateral side branch pipe receiving ports 33 and 35. The multi-port pipe joint 31 having such a configuration can be formed of, for example, hard vinyl chloride for drainage.

  As shown in FIG. 1, in the space UF1 on the first floor, the multi-port pipe joint 31 is arranged such that the vertical pipe receiving port 41 is on the upper side and the straight pipe part 45 is on the lower side. The multi-port pipe joint 11 is used. And the lower end part of the drainage stack 15 is inserted and connected to the standpipe receiving port 41 located in the upper part of this 1st multi-mouth pipe coupling 11. FIG. Although most of the drainage stack 15 is disposed on the floor of the first floor, the drainage stack 15 is disposed in the space UF1 below the floor of the first floor by a through hole CH1 formed in the floor FL1 of the first floor. Connection with one multi-port pipe joint 11 is allowed. Further, the straight pipe portion 45 located at the lower end of the first multi-port pipe joint 11 is inserted into the receiving port 19 c of the leg joint 19 and is directly connected to the leg joint 19.

  In the space UF2 below the floor on the second floor, the multi-port pipe joint 31 is disposed so that the vertical pipe receiving port 41 is down and the straight pipe portion 45 is up to be the second multi-port pipe joint 21. Yes. A standpipe receiving port 41 located at the lower end of the second multi-port pipe joint 21 hangs down through the through hole CH2 formed in the concrete plate C and the underlaying material 5, and the upper end of the drainage standpipe 15. Part is inserted and connected. On the other hand, the straight pipe portion 45 located at the upper end of the second multi-port pipe joint 21 is closed with a cap 25 in order to prevent odor leakage.

According to the drain pipe equipment H1 having the above-described configuration, the following operational effects are obtained.
First, the first multi-port pipe joint 11 and the second multi-port pipe joint 21 body 39 into which the drainage flowing laterally from the drainage horizontal branch pipes 13a, 13b, 23a, and 23b merge flows the drainage downward. The diameter is larger than that of the drainage stack 15, and pressure fluctuations in the pipe accompanying the inflow of drainage can be suppressed. And since the diameter of the horizontal main pipe 17 is larger than the diameter of the drainage standpipe 15, even if the drained water that has flowed down is guided to the horizontal main pipe 17 and starts flowing in the horizontal direction at a reduced speed, the horizontal main pipe 17 is completely blocked. There is nothing, and pressure fluctuation in the pipe can be suppressed. Therefore, even if a large amount of drainage flows from the drainage device, it can be drained smoothly, and the drainage trap of each drainage device is difficult to break. Furthermore, in order to obtain such operational effects, the drain pipe facility H1 of the present embodiment does not require a special ventilation structure for circulating air inside and outside the pipe. Therefore, the distance between the second multi-port pipe joint 21 and the lower surface of the floor FL2 on the second floor is not restricted for the purpose of securing an air circulation space. Can be placed in close proximity to the floor FL2. Therefore, it is easy to arrange in the space UF2 under the limited second floor.

  Moreover, in the said embodiment, as the 1st multi-mouthed pipe joint 11 arrange | positioned in the space UF1 under the floor of the 1st floor, and the 2nd multi-mouthed pipe joint 21 arrange | positioned in the space UF2 under the floor of the 2nd floor. The same-shaped multi-port pipe joint 31 is used upside down. Therefore, the kind of multi-mouth pipe joint can be suppressed to a small number. In the state where the multi-port pipe joint 31 is disposed in the space UF1 below the first floor as the first multi-port pipe joint 11, the straight pipe portion 45 is positioned on the lower side and the leg joint 19 is directly connected to the leg joint 19. Can be connected to. Therefore, the joints can be directly connected without using a pipe or the like of another member, and the number of parts constituting the drainage pipe equipment H1 can be reduced.

It should be noted that various other embodiments of the present invention can be considered without departing from the scope of the present invention.
For example, the horizontal branch pipe receiving port 37 may be downsized using a different diameter pipe connector and connected to a drainage device for miscellaneous drainage. In that case, for example, a different diameter pipe connector 51 as shown by a two-dot chain line in FIG. 1 is preferably used. The different-diameter pipe connector 51 includes a large-diameter portion 51a that is a relatively large-diameter straight tube that can be inserted into and connected to the side branch pipe receptacle 37, and a small-diameter portion that is a straight pipe having the same diameter as the drainage side branch pipe to be connected. 51b is connected and formed continuously in the axial direction so that one point on the outer periphery overlaps. The large-diameter portion 51a is inserted into the side branch pipe receiving port 37 so that the stepless portion 51c is positioned on the side of the vertical pipe receiving port 41 in the tube axis direction, and the different diameter pipe connector 51 is attached to the side branch pipe receiving port 37. Thus, the small-diameter portion 51b is disposed at the same height level as the drainage horizontal branch pipes 13a, 13b, 23a, and 23b connected to the other side branch pipe receiving ports 33 and 35, and protrudes outward from the side branch pipe receiving port 37. . Then, by connecting the small-diameter portion 51b and the drainage horizontal branch pipe through a connecting means such as a socket for connecting the same-diameter pipe, the drainage lateral branch having a smaller diameter that does not match the horizontal branch pipe receiving port 37 is obtained. Can be connected with a tube.

  Moreover, the side branch pipe receptacles 33, 35, and 37 provided in the multi-mouth pipe joint 31 are not limited to the sizes exemplified in the above embodiment. The lateral branch pipe receptacles 33, 35, and 37 can be provided, for example, by a selective combination from the nominal diameters 50, 65, and 75.

  Further, it is not always necessary to connect the drainage horizontal branch pipes to all the horizontal branch pipe receiving ports 33, 35, and 37. The unused horizontal branch pipe receiving ports 33, 35, and 37 are, for example, as shown in FIG. A close lid 53 is attached to close. As shown in FIG. 4, the closing lid 53 has a cylindrical shape that is fitted in the lateral branch pipe receiving port 33, and one end 53 a thereof is closed. The closing lid 53 is inserted so that the closed one end portion 53 a is located inward of the multi-mouth pipe joint 31 and closes the side branch pipe receiving port 33. The closing lid 53 projects outwardly from one end 53a on the inner side of the cylindrical shape and is provided with a handle 53b. The handle 53b is gripped and pushed into the side branch tube receiving port 33 so that it can be easily inserted into the side branch tube receiving port 33. Can be attached to.

  Moreover, the cap 25 which closes the upper end part of the 2nd multi-mouth pipe joint 21 can also be provided with the opening and closing cleaning port. In that case, a cleaning nozzle can be inserted from the cleaning port, and the inside of the second multi-port pipe joint 21, the drainage stack 15, the first multi-port pipe joint 11, and the horizontal main pipe 17 can be cleaned.

11 First multi-port pipe joints 13a, 13b Drainage side branch pipe 15 Drainage standpipe 17 Horizontal main pipe 19 Leg joint 21 Second multi-port pipe joints 23a, 23b Drainage side branch pipe 25 Cap 31 Multi-port pipe joint 33, 35, 37 Transverse pipe receiving port 39 Body portion 41 Standing tube receiving port 43 Tapered portion 45 Straight pipe portions 47a, 47b Inflow prevention wall FL1 (first floor) floor FL2 (second floor) floor H1 drain pipe facility UF1 first floor under floor Space UF2 Space below the second floor

Claims (2)

It is a drainage pipe facility for a two-story apartment house,
A first multi-port pipe joint and a second multi-port pipe joint arranged in a space under the floor on the first floor and a space under the floor on the second floor; A drainage stack interposed between two multi-port pipe joints, and a horizontal main pipe connected to the lower side of the first multi-port pipe joint,
The first multi-port pipe joint and the second multi-port pipe joint are provided with a plurality of side branch pipe receiving ports to which a drainage side branch pipe can be connected to the outer periphery of the trunk portion. Each of the space under the floor is provided with a plurality of drainage branch pipes to which a plurality of drainage devices such as a kitchen sink, a bathroom, and a wash basin are connected. 2 is connected to a side branch pipe receiving port of the multi-port pipe joint, and a body portion provided with the side branch pipe receiving port of the first multi-port pipe joint and the second multi-port pipe joint is a straight tube. A drainage pipe facility for a two-story apartment house, characterized in that the diameter is larger than the drainage stack and the horizontal main pipe is larger in diameter than the drainage stack. A multi-way pipe joint used for drainage pipe facilities of a two-story apartment building according to claim 1,
A vertical pipe body provided with a plurality of horizontal branch pipe outlets on the outer periphery, and a drainage pipe provided on one end side in the tube axis direction of the body part to be inserted and connected; A tubular portion extending in a straight tubular shape with the same diameter as the barrel portion provided on the other end side;
The diameter of the trunk portion and the tubular portion is larger than the drainage standpipe connected to the standpipe receiving port,
In the space under the floor on the second floor, the tubular portion is arranged so that the vertical pipe receiving port is down, and in the space under the floor on the first floor, the vertical tube receiving port is up and the tubular part is down. A multi-storey pipe joint for a two-storied apartment house, characterized by being arranged as described above.

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