JP2020051230A - Method of repairing drainage system and drainage system - Google Patents

Abstract

To renovate in a short period of time and at a low cost without having to do chipping work or the like and can improve drainage performance.SOLUTION: A drainage system 1 is provided with a ventilation riser pipe line 4 and a newly constructed drain riser pipe line 3 which penetrate through floor slabs 2 of a building. The repairing method comprises the steps of: removing an existing drain riser pipe line; fitting the lower connecting pipe of an assembly joint 10 to penetration openings 2a of the floor slabs 2 where the existing drain riser pipe line has been removed and connecting a new drain riser 11 to the assembly joint 10 and installing the new drain riser pipe line 3; connecting a drainage horizontal branch pipe 13 to the upper connecting pipe of the assembly joint 10; and connecting the ventilation riser pipe line 4 to the newly constructed drain riser 11 or the assembly joint 10 with a vent transverse branch pipe 18. The assembly joint 10 has an upper connecting pipe with a built-in enlarged hollow section with a rotating vane and a lower connecting pipe with a reduced diameter.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a method for repairing a drainage system in which an existing drainage system installed in a building or the like having a multi-story floor is repaired, and to a repaired drainage system.

  2. Description of the Related Art Conventionally, in high-rise buildings such as condominiums and apartment buildings and buildings, drainage pipes are installed as drainage systems that vertically penetrate floor slabs of floors. Drain horizontal branch pipes connected to drainage equipment such as baths, washing machines, and washrooms installed on each floor are connected to drain stacks, and drainage of drain equipment is drained from drain horizontal branch pipes on each floor. It is drained downward through the drain.

  For example, in a drainage system described in Patent Literature 1, a drainage stack conduit and a ventilation stack are vertically installed through through holes provided in floor slabs of each floor of a building. The drain stack has a configuration in which collective joints installed at the through-holes of the floor slabs on each floor are connected by a drain stack. And the drain horizontal branch pipe of the drainage equipment installed on each floor is connected to the connecting part of the collective joint, and the ventilating horizontal branch pipe branched from the ventilation standpipe is also connected to the connecting part of the collective joint.

  By the way, in order to prevent drainage leakage and improve drainage performance when such drainage system deteriorates and deteriorates over time, the drainage pipe and drainage lateral branch pipe have been removed and a new drainage system has been installed. There is a need to. In this case, in order to improve the drainage performance, it is necessary to increase the diameter of the collective joint and the drainage pipe, and it is necessary to perform cutting work such as expanding the through-hole of the floor slab.

JP 2017-166299 A

However, the cutting work for expanding the through-hole of the floor slab requires noise due to the occupants and existing facilities on each floor, and it takes time and effort to complete the construction. There is a problem of getting high. Moreover, the invention described in Patent Document 1 does not disclose the repair work.
In addition, when all the drainage stacks of the existing drainage system are removed and a new drainage stack is installed, there is a problem that a large amount of waste is generated in addition to a large number of removal steps.

  The present invention has been made in view of such problems, and a drainage system that can be repaired in a short period of time and at low cost without performing complicated work such as cutting work and the like, and can improve drainage performance. It is an object of the present invention to provide a rehabilitation method and a drainage system.

The method for repairing a drainage system according to the present invention is a method for repairing an existing ventilation standpipe installed through a floor slab of a building and a drainage system having a drainage standpipe. And installing a lower connection pipe of a collective joint having an upper connecting pipe with a built-in swirl vane and a lower connecting pipe below the upper connecting pipe at the through hole of the floor slab of the existing drainage stack pipe, and installing a new connecting pipe at the collective joint. Connecting a drainage stack to install a new drainage stack, connecting a drainage lateral branch pipe to the upper connecting pipe of the collective joint, and installing a vented stack and a new drainage stack or collective joint. And a step of connecting with a horizontal ventilation branch pipe.
According to the present invention, the newly installed drainage stack is connected to the lower connection pipe of the collective joint which is attached to the through hole of the floor slab from which the existing drainage stack has been removed, and the upper and lower sides of the lower connection pipe are connected. The drainage system can be modified by installing a drainage stack line and connecting the drainage horizontal branch pipe connected to the drainage device and the ventilation horizontal branch pipe extending from the ventilation stack pipe to the upper connection pipe.

  A method of repairing a drainage system according to the present invention is a method of repairing an existing ventilation standpipe installed through a floor slab of a building and a drainage system having a drainage standpipe. And installing a lower connection pipe of a collective joint having an upper connecting pipe with a built-in swirl vane and a lower connecting pipe below the upper connecting pipe at the through hole of the floor slab of the existing drainage stack pipe, and installing a new connecting pipe at the collective joint. A step of connecting a drainage stack to install a new drainage stack, a step of connecting the ventilation stack and the new drainage stack or collective joint with a ventilation horizontal branch pipe, and an upper connecting pipe of the collective joint And a step of connecting a drainage horizontal branch pipe to the drainage pipe.

In addition, it is preferable that the method further includes a step of connecting a leg joint to a lower end of the newly installed drainage duct, and a diameter of a downstream end of the leg joint is preferably formed larger than a diameter of an upstream end.
If the drainage flow rate of the drainage stack increases, even if the drainage flow rate of the drainage stack increases due to the same drainage stack as the existing drainage stack whose diameter has been removed and the drainage pressure increases, the leg joint By making the diameter of the downstream end larger than that of the upstream end, the drainage flow rate can be increased and the drainage performance can be improved.

  Further, the connection between the ventilation standpipe and the newly installed drainage standpipe or collective joint may be performed on a plurality of floors or floors provided with floor slabs.

The drainage system according to the present invention is a drainage system including a ventilation standpipe installed through a floor slab of a building and a newly installed drainpipe,
An upper connecting pipe having a swirling blade built therein and having an enlarged diameter, and a lower connecting pipe which is attached to a through-hole of a floor slab from which an existing drainage stack has been removed and has a diameter smaller than that of the upper connecting pipe. A collective joint, a newly installed drainage stack connected to the upper and lower connection ports of the collective joint, a drain horizontal branch pipe connected to the upper connection pipe of the collective joint to discharge wastewater, and a vented vertical pipe And a newly installed drainage stack or a vented horizontal branch pipe connecting the upper connecting pipe of the collective joint, and a lower end of the drainage stack which is connected to the lower end of the drainage stack and has a smaller diameter at the downstream end than at the upstream end. And a larger leg joint.
According to the present invention, a lower connection pipe with a reduced diameter of the collective joint is attached to the through hole of the floor slab, and a new drain stack is installed by connecting a new drain stack above and below the lower connection pipe, and drainage is performed. A modified drainage system can be obtained by connecting the drainage horizontal branch pipe connected to the equipment and the ventilation horizontal branch pipe extending from the ventilation stack pipe to the upper connection pipe.

  A method for repairing a drainage system and a drainage system according to the present invention use a vented horizontal branch pipe to connect an existing ventilation standpipe installed on a floor slab and a newly installed drainage standpipe joint or drainpipe. Since the connection is established, even if the installation positions of the newly installed drainage stack and the collective joint are shifted from the ventilation stack, the connection can be surely made.

1 is a schematic diagram of a drainage system according to an embodiment of the present invention. It is an expanded sectional view of the collective joint installed in the drainage system shown in FIG. It is sectional drawing of the leg joint connected to the lower end part of the drainage standpipe. It is a schematic diagram which shows the modification which connected the ventilation standpipe and the newly installed drainage standpipe by a ventilation horizontal branch pipe.

Hereinafter, a drainage system and a repair method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The drainage system 1 shown in FIG. 1 schematically shows the drainage system 1 for dwelling units on each floor in a high-rise building such as an apartment. The drainage system 1 has a two-pipe structure, and includes a new drainage pipe 3 and a ventilation pipe 4 which are installed vertically through floor slabs 2 of each floor.
A lower end of a top ventilation pipe 6 is connected to an upper end of the drainage pipe 3, and an upper end of the top ventilation pipe 6 is open to the atmosphere on the rooftop. The lower end of the drainage pipe 3 is connected via a leg joint 7 to a horizontal main pipe 8 for guiding drainage to a sewer or a sewage treatment tank.

The drainage stack 3 is provided with a joint 10 whose lower part is inserted into the through-hole 2 a from which the existing drainage stack (not shown) is removed in the floor slab 2 of each floor, and between the collective joints 10. And a drain stack 11 connected thereto. Each collective joint 10 has an upper connecting pipe 20 located above the floor slab 2 and a lower connecting pipe 21 inserted into the through-hole 2a.
In the collective joint 10 of each floor, the upper connection pipe 20 protruding upward from the floor slab 2 is provided with an upper connection port 10a provided at an upper end and an opening at a side portion and at a predetermined interval in a circumferential direction from each other. A plurality, for example, three side connection ports 10b, 10c, and 10d are formed. A lower connection port 10e is also formed at the lower end of the lower connection pipe 21 projecting downward from the floor slab 2 of the collective joint 10.

A drain stack 11 on the upper floor is fitted into the upper connection port 10a of the collective joint 10, and a drain stack 11 on the lower floor is fitted into the lower connection port 10e. The lower end of the top ventilation pipe 6 is connected to the upper connection port 10a of the collective joint 10 on the top floor.
The side connection ports 10b, 10c, and 10d provided on the side of the collective joint 10 are formed, for example, at the same diameter and the same height. Note that the side connection ports 10b, 10c, and 10d need not have the same diameter, and may have a diameter corresponding to the drainage device.

  In the drainage system 1 according to the present embodiment, for example, the drainage horizontal branch pipes 13 are connected to the side connection ports 10b and 10c of the collective joint 10, respectively. As shown in FIG. 1, various drainage devices 14, 15, 16 such as a bathtub, a washing machine, and a washstand installed on the floor surface of each floor slab 2 are connected to the drain horizontal branch pipe 13. The drainage discharged from the various drainage devices 14, 15, 16 flows through the drainage horizontal branch pipe 13 from the collective joint 10 to the drainage stack 3.

Since the upper end of the ventilation standpipe 4 is connected to the uppermost collective joint 10 of the drainage standpipe 3 on the uppermost floor, the ventilating standpipe 4 is opened to the atmosphere through the extended vent pipe 6 from the collective joint 10. ing. The lower end of the ventilation standpipe 4 is connected to the lowermost collective joint 10 of the drainage standpipe 3 on the lowest floor. Alternatively, the lower end of the ventilation standpipe 4 may be connected to the lower end of the drain standpipe 11, or may be connected to the lower leg joint 7 or the horizontal main pipe 8. In the present embodiment, the existing vent pipe 4 is not replaced, and the existing one is used as it is. However, the vent pipe 4 may be replaced with a new vent pipe.
The diameter of the ventilation standpipe 4 may be smaller than the diameter of the drainage standpipe 3. The material of the ventilation stack 4 is not particularly limited, but is preferably made of a fire-resistant vinyl chloride resin, like the drain stack 11. Further, it is preferable that a sheet having a closing function when heated is wound around an appropriate portion.

A flexible ventilation branch pipe 18 (venting means) is connected to the other side connection port 10d of the collective joint 10 from the ventilation standpipe 4 of each floor, and air is supplied to the drainage standpipe 3. Supply and exhaust. One end of the ventilation horizontal branch pipe 18 is connected to the ventilation standpipe 4, and the other end is connected to the side connection port 10 d of the collective joint 10. The diameter of the ventilation horizontal branch pipe 18 can be set as appropriate, but is usually set smaller than the drain horizontal branch pipe 13. The side connection port 10d may be at the same height as the other side connection ports 10b and 10c, but is preferably formed at a higher position.
The ventilation horizontal branch pipe 18 is made of, for example, a flexible synthetic resin or rubber. Therefore, even if the installation position such as the height of the newly installed drainage duct 3 is shifted with respect to the existing ventilation stacking pipe 4 with respect to the existing drainage stacking pipe 4, the flexible drainage horizontal branch pipe 18 can be used. And can be easily connected to the side connection port 10d of the collective joint 10 at different height positions.

Next, the structure of the collective joint 10 will be described with reference to FIG.
The collective joint 10 of the present embodiment is made of, for example, resin (or may be made of metal), and has an upper connection pipe 20 having an upper connection port 10a and a lower connection pipe 21 having a lower connection port 10e. The upper connecting pipe 20 and the lower connecting pipe 21 of the collective joint 10 are formed in, for example, an oval cross section. The upper connecting pipe 20 and the lower connecting pipe 21 are coaxial and have the same central axis O.
The collective joint 10 has a hollow portion as a drainage collecting portion in which the upper connection pipe 20 has a larger diameter than the lower connection pipe 21, and the lower connection pipe 21 has a middle portion whose diameter is increased at an upper end thereof. A portion 22 is formed, and a tapered tube portion 21a is formed in a tapered tubular shape whose diameter is reduced downward from the intermediate portion 22. A lower connection port 10 e is formed at the lower end of the lower connection pipe 21. Side connection ports 10b, 10c, and 10d are provided on the side surface of the upper connection pipe 20 at predetermined intervals in the circumferential direction.

  Moreover, the lower connecting pipe 21 is inserted into the through-hole 2a of the floor slab 2 from the upper floor, the intermediate part 22 is located in the through-hole 2a, and the tapered pipe part 21a projects to the lower floor. The gap between the through-hole 2a of the floor slab 2 and the intermediate portion 22 of the lower connecting pipe 21 and the upper portion of the tapered pipe portion 21a located in the through-hole 2a is filled and fixed with mortar M. In this embodiment, the inner diameter of the opening of the mortar M and the outer diameter of the lower connecting pipe 21 of the newly installed joint 10 fitted to the mortar M are formed to have the same size or less so as not to chip the mortar M in the repairing process. Have been.

The upper connecting pipe 20 is installed above the floor slab 2 in a state where the newly installed joint 10 is inserted and fixed in the through hole 2 a of the floor slab 2. Inside the upper connection pipe 20, a dam plate 23 is installed at a position facing the side connection port 10 d for connecting the ventilation horizontal branch pipe 18 and the side connection port 10 b for connecting the drain horizontal branch pipe 13. . The installation angle of the dam plate 23 is set, for example, within a range of −30 ° to + 30 ° from the vertical direction.
If the installation angle of the baffle plate 23 is larger than + 30 °, the swirling flow of the swirled drainage will not be sufficiently blocked, and a backflow to the ventilation lateral branch pipe 18 may occur. Further, if the installation angle is smaller than −30 °, the rebound of the received drainage becomes large, which may disturb the flow of the drainage, and the pressure fluctuation in the pipe may become large.

The side connection ports 10 b, 10 c, and 10 d project from the peripheral wall of the upper connection pipe 20 in a cylindrical shape outward in a radial direction orthogonal to the central axis O. The number and the extending direction of the side connection ports 10b, 10c, and 10d are not limited to such an embodiment, and can be arbitrarily changed.
On the inner peripheral surface of the upper connection port 10a of the upper connection pipe 20 to which the upper drain stack 11 is connected, a vertical bush 25 located between the upper drain pipe 11 and the vertical seal member 26 such as packing. , A vertical ring 27. The vertical bush 25 includes a fitting portion 25a, a turning blade 25b, and a turning blade support leg 25c. The fitting portion 25 a has a smaller diameter than the upper end portion of the vertical bush 25 and has a cylindrical shape fitted into the upper connection pipe 20.

The swirl vane 25b has, for example, a projected area of the swirl vane 25b viewed in the pipe axis direction of 5% to 30% with respect to an inner cross-sectional area of the drainage stack 11, and an inclination angle of 20 ° to 50 °. As described above, is supported by the swirling blade supporting leg 25c. The turning blade supporting leg 25c has a width substantially equal to the horizontal width of the turning blade 25b and substantially extends from the lower end of the fitting portion 25a, and the lower end edge is inclined so as to follow the inclination of the turning blade 25b. The swirling blade support leg 25c has a swirling blade supporting surface formed in an arc-shaped cross section, and supports the swirling blade 25b slightly above the lower edge.
In addition, since the swirl blade 25b is applied when high drainage performance is required according to the scale of the building and the number of drainage devices 14, 15, 16, it is omitted in the case of a building where high drainage performance is not required. Is also good.

The vertical ring 27 is fitted around the upper end of the vertical bush 25 to prevent the vertical seal member 26 from coming off the vertical bush 25. After the vertical bush 25, the vertical seal member 26, and the vertical ring 27 are assembled and integrated in advance, the fitting portion 25a of the vertical bush 25 can be fitted to the upper connection pipe 20 and bonded. At the distal ends of the side connection ports 10b, 10c, and 10d for connecting the drain horizontal branch pipe 13 and the ventilation horizontal branch pipe 18, a horizontal bush having the same configuration as the vertical bush 25, the vertical seal member 26, and the vertical ring 27 is provided. A seal member and a horizontal ring are provided.
The lower connection pipe 21 is formed to have a smaller diameter than the upper connection pipe 20, and the lower connection pipe 21 is not provided with the swirling blade 25 b. In addition, in the present embodiment, the lower connecting pipe 21 of the newly installed joint 10 has an outer diameter that is substantially the same as or smaller than the size of the existing drainage pipe removed from the through hole 2a of the floor slab 2. The mortar M of the mouth 2a can be attached to the through-hole 2a without shaving.

In the collective joint 10, the drainage from the drainage stack 11 on the upper floor and the drainage from the plurality of drainage lateral branch pipes 13 merge, but the merged drainage is swirled by the swirling blade 25b to separate the drainage and air. Therefore, pressure fluctuations in the drain stack 3 can be suppressed.
Moreover, since the ventilation standpipe 4 is connected to the collective joint 10 via the ventilating horizontal branch pipe 18 on each floor, it is possible to smoothly supply air to the collective joint 10 and release air from the collective joint 10. . Therefore, the pressure fluctuation of the drainage in the drainage stack 3 can be further suppressed.

Next, the leg joint 7 connected to the lower end of the drainage stack 3 will be described with reference to FIG.
At the lower end of the drainage pipe 3, a collective joint 10 fitted to the through-hole 2 a of the floor slab 2 on the lowest floor is mounted. The leg joint 7 is connected to a tapered lower connecting pipe 21 extending below the floor slab 2 of the collective joint 10.

The leg joint 7 connects the collective joint 10 at the lower end of the drainage stack 3 to the horizontal main pipe 8. An adapter 32 is formed on the leg joint 7 at a connection portion of the drainage standpipe 3 with the lower connection pipe 21 of the collective joint 10. The leg joint 7 has an upstream first end 33 in which the lower connecting pipe 21 is mounted, a downstream second end 34 in which the horizontal main pipe 8 is mounted, a first end 33 and a first end 33. And a curved tube portion 35 formed between the two end portions 34 and curved in a substantially arc shape.
The first end 33 and the second end 34 have an annular shape with a stepped diameter that is increased with respect to the diameters of the upstream end 35b and the downstream end 35c of the curved tube portion 35. The first end 33 is a receptacle into which the lower end of the lower connection pipe 21 of the collective joint 10 is fitted. The second end 34 is a receptacle into which the pipe 37 of the horizontal main pipe 8 is fitted. A supported portion 35a that projects downward is provided below the curved portion of the curved tube portion 35. The supported portion 35a is supported by, for example, a support fitting (not shown).

Moreover, the leg joint 7 is formed in a tubular shape in which the downstream end portion 35c and the second end portion 34 of the curved tube portion 35 are larger in diameter than the upstream end portion 35b and the first end portion 33. The diameter D2 of the downstream end 35c is larger than the diameter D1 of the upstream end 35b of the portion 35, for example, 1.5 times. In this case, the diameter of the second end 34 is preferably set to be larger than the diameter of the first end 33, and the diameter of the horizontal main pipe 8 is preferably equal to or larger than the diameter D2 of the downstream end of the leg joint 7.
Therefore, even when the flow rate of the drainage flowing down the drainage pipe 3 increases from before the repair and the water pressure rises, the downstream end 35 c of the leg joint 7 is connected to the upstream end 35 b and the drainage pipe 3. Since the diameter is larger than the lower end, the drainage flow rate is increased by the leg joint 7 and the drainage can be performed smoothly.

  The horizontal main pipe 8 connected to the downstream side of the leg joint 7 guides the drainage flowing through the drainage duct 3 in the horizontal direction through the leg joint 7 and discharges it to the outside of the site. The horizontal main pipe 8 includes a piping path 37 and a cleaning joint 38. The nominal diameter of the horizontal main pipe 8 is set to be larger than the nominal diameter of the drainage pipe 3. The cleaning joint 38 has a cleaning port 39 formed on the peripheral surface of the cleaning joint 38, and a lid 40 is detachably attached to the cleaning port 39.

The drainage system 1 according to the present embodiment has the above-described configuration. Next, a repair method of the drainage system 1 will be described.
In a high-rise building such as an existing condominium, repair work may be performed to repair or replace the drainage system 1 or increase drainage flow rate. When such a drainage system 1 is modified, as shown in FIG. 1, the existing drainage line 4 is first removed while the existing ventilation line 4 is left as it is.

  Then, the lower connecting pipe 21 of the collective joint 10 is fitted into the through hole 2a of the floor slab 2 of each floor. The gap between the through-hole 2a and the lower connection pipe 21 is filled with mortar M. At that time, in the collective joint 10 according to the present embodiment, as shown in FIG. 2, the upper connection pipe 20 as the drainage collective portion of the collective joint 10 located above the floor slab 2 is connected to the collective joint of the conventional drainage standpipe. It is formed with a larger diameter.

Then, the drain stack 11 is connected to the upper connection port 10a and the lower connection port 10e of each collective joint 10 installed at the through-hole 2a of each floor slab 2. As a result, a new drainage pipe 3 is installed. The diameter of the newly installed drainage stack 3 is increased at the upper connecting pipe 20 in the collective joint 10 and substantially the same at the lower connecting pipe 21 and the drainage stack 11 as compared with the existing drainage stack. It is smaller than the diameter.
Next, the other end of the flexible ventilation lateral branch pipe 18 having one end connected to the existing ventilation standpipe 4 is connected to the side connection port 10d of the collective joint 10 on each floor. At that time, the installation position of each collective joint 10 of the newly installed drainage duct 3 may be shifted in height or position as compared with the removed existing drainage duct. Even in such a case, since the ventilation lateral branch pipe 18 is flexible, it can absorb positional displacement in the height direction or the horizontal direction and can be connected to the side connection port 10d of each collective joint 10.

Also, the side connection ports 10b and 10c of the collective joint 10 of the newly installed drainage standpipe 3 are provided with drainage horizontal branch pipes of drainage devices 14, 15, and 16 such as bathtubs, washing machines, and washstands installed on each floor. 13 are connected. As the drain horizontal branch pipe 13, an existing one may be attached, or a new one may be attached. When attaching the newly installed drain horizontal branch pipe 13 to the collective joint 10, a pipe having a larger diameter or a smaller diameter than the existing one may be used.
Further, the newly installed leg joint 7 is attached to the lower end of the newly installed drainage pipe 3, for example, the lower connecting pipe 21 of the collective joint 10. In the leg joint 7, the diameter D2 of the downstream end 35c of the curved pipe portion 35 is set to be larger than the diameter D1 of the upstream end 35b, for example, 1.5 times. Further, the horizontal main pipe 8 may be replaced with a new horizontal main pipe 8 from the existing horizontal main pipe.

According to the modified drainage system 1 according to the present embodiment, drainage of drainage devices 14, 15, 16 such as bathtubs, washing machines, and wash basins installed on floors of each floor of a building such as an apartment building is replaced by a drain horizontal branch pipe 13. Through the side connection ports 10b, 10c of the collective joint 10 into the upper connection pipe 20. In the collective joint 10, the drainage from the drainage stack 11 on the upper floor and the drainage from the drainage horizontal branch pipes 13 merge.
The combined drainage is given a swirling force by being swirled by the swirling blades 25b, and the drainage flows downward as a swirling flow along the inner wall surface of the upper connecting pipe 20 to form an air core on the central axis O. The wastewater and air are separated. Therefore, the drainage smoothly flows in the drainage duct 3 as a swirling flow, and pressure fluctuation can be suppressed.

Moreover, since the ventilation standpipe 4 is connected to the collective joint 10 via the ventilating lateral branch pipe 18 at each floor, it is possible to smoothly supply air to the collective joint 10 and release air from the collective joint 10, Fluctuations in pressure in the drainage stack 3 can be further suppressed.
The drainage flowing down from the drainage pipe 3 to the leg joint 7 has a diameter D2 at the downstream end of the leg joint 7 that is 1.5 times larger than the diameter D1 of the upstream end 35b. Therefore, it is discharged in large quantities and smoothly and sent to sewers or sewage treatment tanks. At this time, even if the drainage flow supplied from the drainage devices 14, 15, 16 to the collective joint 10 increases and the drainage pressure in the drainage duct 3 increases, the drainage flowing down to the lower leg joint 7 thereof Since the pressure load can be reduced by increasing the flow rate, drainage can be smoothly and smoothly performed even if the drainage flow rate increases.

As described above, according to the drainage system 1 and the repair method thereof according to the present embodiment, the drainage performance can be improved as compared with the conventional drainage system.
In addition, since the upper connection pipe 20 of the collective joint 10 is formed in a bulged and expanded hollow portion, the internal space can be expanded in diameter, and a necessary drainage flow rate and ventilation can be secured. Therefore, the ventilation can be exchanged between the collective joint 10 and the ventilation standpipe 4, and the drainage performance is improved. In addition, since the swirl vanes 25b are built in the upper connection pipe 20, the flow of water is tied and the layers of water and air can be clearly separated. This stabilizes the contact area between water and air, so that the fluctuation value of the internal pressure also stabilizes, and suppresses a rapid fluctuation in drainage performance.
In addition, since the lower end of the drainage pipe 3 is provided with the leg joint 7 having an enlarged diameter of the downstream end 35c, the direction of drainage is smoothly changed, the drainage flow rate is improved, and the pressure variation in the pipe is increased. To prevent a sudden rise in

In addition, by using the existing ventilation standpipe 4 after the renovation, the construction cost and the construction time can be greatly reduced, and the amount of waste can be reduced by partially remodeling.
Moreover, the drainage performance can be enhanced by the cooperation of the ventilation standpipe 4 for replenishing and releasing air into the drainage standpipe 3 and the collective joint 10 having a function of turning the drainage. Therefore, even if the drainage load is large, the size of the drainage stack 3 can be reduced.

  As described above, the drainage system 1 and the repair method thereof according to the embodiment of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof. In the following, modified examples of the present invention will be described, but the same or similar members and portions as those in the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

  For example, in the above description, the other end of the flexible ventilation lateral branch pipe 18 having one end connected to the ventilation standpipe 4 is connected to the side connection port 10 d of the collective joint 10. However, the present embodiment is not limited to such a configuration. For example, as in the modification shown in FIG. 4, the cheese joint 30 and the like are connected to the drain stack 11 connected to the upstream side of the collective joint 10, and the other end of the ventilation horizontal branch pipe 18 is connected to the cheese joint 30. You may.

In the above-described embodiment, the diameter of the newly installed drain stack 11 is set to be the same as that of the existing drain stack, but may be set smaller. As a result, the piping space of the drain stack 11 can be effectively used, and the degree of freedom in construction is improved.
The diameter of the newly installed drain stack 11 may be set larger than the existing drain stack within the range of the through-hole 2a of the floor slab 2. Thereby, it is possible to discharge a larger amount of wastewater. In addition, the strength of the skeleton can be improved by reducing the penetrating area of the lower connecting pipe 21 of the newly installed joint 10 through the through hole 2a and additionally filling the mortar M into the gap.

In the drainage system 1 according to the above-described embodiment, the ventilation standpipe 4 is connected to the drainage standpipe 3 at each floor through the ventilation horizontal branch pipe 18, but if the drainage load is small, skip one floor instead of each floor. Alternatively, it may be skipped by two floors and connected to the collective joint 10 or the drain stack 11 of the drain stack 3.
It is preferable that the ventilation standpipe 4 be connected to the drainage standpipe 3 at a plurality of places (multiple floors) in the middle, but when the building is a low-rise building, only one point is connected to the drainage standpipe 3 in the middle. May be.

DESCRIPTION OF SYMBOLS 1 Drainage system 2 Floor slab 2a Through hole 3 Drainage stand 4 Drainage stand 7 Leg joint 8 Horizontal main pipe 10 Collective joint 10a Upper connection 10b, 10c, 10d Side connection 10e Lower connection 11 Drain stand 13 Drain horizontal branch pipes 14, 15, 16 Drainage equipment 18 Ventilation horizontal branch pipe 20 Upper connection pipe 21 Lower connection pipe 25b Swirl vane 35 Curved pipe section 35b Upstream end 35c Downstream end

Claims (5)

In a method of retrofitting a drainage system with an existing ventilation stack and a drain stack installed through the floor slab of the building,
Removing the existing drainage line;
A lower connection pipe of a collective joint having an upper connecting pipe having a built-in swirling blade and a lower connecting pipe below the lower connecting pipe is installed in the through-opening of the floor slab of the existing drainage standpipe, and a new drainage stand is installed in the collective joint. Connecting the pipes and installing a new drainage stack,
Connecting a drain horizontal branch pipe to the upper connection pipe of the collective joint,
Connecting the vent stack and the newly installed drain stack or the collective joint,
A method for repairing a drainage system, comprising: In a method of retrofitting a drainage system with an existing ventilation stack and a drain stack installed through the floor slab of the building,
Removing the existing drainage line;
A lower connection pipe of a collective joint having an upper connecting pipe having a built-in swirling blade and a lower connecting pipe below the lower connecting pipe is installed in the through-opening of the floor slab of the existing drainage standpipe, and a new drainage stand is installed in the collective joint. Connecting the pipes and installing a new drainage stack,
Connecting the vent stack and the newly installed drain stack or the collective joint,
Connecting a drain horizontal branch pipe to the upper connection pipe of the collective joint,
A method for repairing a drainage system, comprising: The method further comprises a step of connecting a leg joint to a lower end of the newly installed drainage conduit,
3. The method according to claim 1, wherein the diameter of the downstream end of the leg joint is larger than the diameter of the upstream end. 4. The drainage system according to any one of claims 1 to 3, wherein the connection between the ventilation standpipe and the newly installed drainage standpipe or the collective joint is performed on a plurality of floors or each floor including the floor slab. Renovation method. A drainage system comprising a ventilation standpipe installed through the floor slab of the building and a new drainage standpipe,
An upper connecting pipe having a swirling blade built therein and having an enlarged diameter, and a lower connecting pipe which is attached to a through hole of a floor slab from which an existing drainage stack is removed and has a diameter reduced from the upper connecting pipe. Collective joint,
A new drain stack connected to the upper connection port and the lower connection port of the collective joint,
A drain horizontal branch pipe connected to the upper connection pipe of the collective joint and discharging drain water,
A vented horizontal branch pipe connecting the vented standpipe and the newly installed drainage standpipe or the upper connection pipe of the collective joint,
A leg joint that is connected to the lower end of the drainage stack and has a larger diameter at the downstream end than at the upstream end;
A drainage system comprising:

Images