JP2009007915A - Drain pipe laying construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain pipe laying construction method capable of forming a gradient of a drain pipe even in a narrow building of an underfloor part, by easily replacing the drain pipe without damaging the building based on a quality fixing method. <P>SOLUTION: The drain pipe 3 and a sheath pipe 7 for inserting the drain pipe 3, are formed with flexibility, and are laid in a curved shape in a house 2. The sleeve 7 is arranged at one end in the vicinity of a drainage apparatus 1, and the other end is oppositely arranged to a confluent header 9. The other end of the drain pipe 3 having one end connected to the drainage apparatus 1 is connected to the confluent header 9, and when replacing the drain pipe 3, an inspection port 4b of a floor 4 is opened, and can be inserted and extracted from an outflow side end part of the sleeve 7. When the height of the floor 4 is narrow, the sleeve 7 is laid in the substantially horizontal direction under the floor 4, and the gradient of the drain pipe 3 is formed in the pipe by supporting the drain pipe 3 by a pipe support on the inside of the sleeve 7. An air vent is also arranged in at least one place in the drain pipe 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drain pipe laying method in which a drain pipe connected to a drainage device is inserted through a sheath pipe.

  Drainage equipment (e.g., washing machines, bath tubs, toilets, kitchen tables, etc.) installed in the house is discharged outside the house through a drain pipe installed under the floor in the case of a detached house. In the case of an apartment house such as, it passes through the floor and is connected to a drainage stack. The drain pipe is generally formed of vinyl chloride. As shown in FIG. 13, the drain pipe 23 formed in a straight tube shape and connected to the drainage device 1 is connected to the drainage device 1 under the floor, for example, by a plurality of elbows 24. It is laying out of the house. These drainage pipes 23 and elbows 24 may be damaged by joints (elbows) due to stress such as earthquakes, or oil or dust may adhere to the piping due to long-term use, or drainage such as hot water. Therefore, the drain pipe needs to be renewed due to problems such as the drain pipe being bent and the drain gradient being unable to be maintained. For this reason, the Building Quality Act stipulates that it is easy to replace the water supply and drainage pipes without damaging the building.

  In general, when replacing the drain pipe, it was necessary to peel off the floor and install a new drain pipe, so that if you try to work within the range specified by the accuracy law, the floor may be damaged. Therefore, it was difficult and time-consuming to remove.

  Conventionally, Patent Document 1 discloses a drainage pipe structure in which a flexible member is connected to an end of a drainage pipe and the flexible member is inserted into a sheath pipe embedded in a concrete foundation of a building. . Further, Patent Document 2 discloses that a flexible water supply pipe is inserted into a flexible sheath pipe with respect to the water supply pipe. Further, Patent Document 3 discloses a flexible drain pipe.

  According to Patent Document 1, the sheath pipe is embedded in a concrete foundation, and a flexible pipe is inserted through the concrete foundation. The flexible pipes are arranged in a curved line and pass through the inside of the sheath pipe, and connect the in-house drain pipe and the outside drain pipe at both ends. Both the in-house drain pipe and the out-of-home drain pipe are piped in a substantially horizontal position, and the out-of-home drain pipe is positioned lower than the in-house drain pipe to allow drainage from the inside of the house. As a result, the flexible tube can be easily detached from the sheath tube.

  Further, according to Patent Document 2, since the water supply pipe is inserted into the sheath pipe, the insertion work of the water supply pipe can be easily performed. For example, even when water leaks in the water supply pipe, Even if the conductor is not discharged and a conductor is wired next to it, water is not transmitted to the conductor, and it is possible to prevent the occurrence of great damage.

Furthermore, according to Patent Document 3, since the drain pipe is formed as a flexible pipe having flexibility, it can be laid in the house in a curved state.
JP 2002-54203 A JP 2001-280556 A JP 2001-349477 A

  In the drainage pipe, since the pressure in the drainage pipe is low, the drainage pipe is laid so as to be inclined downward from the upstream side toward the downstream side. Therefore, even if it is a pipe body made of vinyl chloride, if it is laid so as to become lower toward the downstream side, the drainage function can be obtained, so there was no problem in arranging it in a straight tube using an elbow . However, as the method for quality assurance was enacted, it was required to easily replace the drainage pipe without damaging the building, so it was necessary to review the laying state of the drainage pipe. Conventionally, since the drain pipe is formed in a straight tube shape, in particular, with vinyl chloride, the direction is changed by using an elbow in the laying state from the drainage device to the end on the outflow side. This means that when the drain pipe is replaced, it cannot be pulled out from the outflow side, and there is no other way but to remove the floor and replace it.

  In the case of Patent Document 1, even if a flexible sheath pipe is embedded in a concrete foundation and the flexible pipe is inserted into the sheath pipe, the drain main pipe laid in the house and connected to the flexible pipe is flexible. Not formed with. Therefore, even if the flexible pipe in the sheath pipe embedded in the foundation can be inserted and removed from the outside, when replacing the drain pipe in the house, the replacement work cannot be performed unless the floor is peeled off. It was.

  In addition, in the case of Patent Document 2, it is described that a water supply pipe or a hot water supply pipe is inserted into a sheath pipe and then piped from a water supply source to a water supply port along the floor or in the wall. It is not configured to be inserted and removed from the outside. In addition, what is inserted into the sheath pipe is a water supply pipe or hot water supply pipe. When piping a drain pipe through which low-pressure water flows, a drain pipe made of vinyl chloride is piped in a straight tube as before, and an elbow is used. It was laid while changing direction by 90 degrees. For this reason, it was not possible to replace the drain pipe by removing it from the outside.

  In Patent Document 3, although the drain pipe is formed with flexibility, it is necessary to newly examine a concrete laying method of the flexible drain pipe in the house.

  At this time, in the case of apartment houses such as apartments and apartments, the height under the floor is low, and it is difficult to incline the Saya tube within the floor. Since it is assumed that the drain pipe is inclined downward toward the downstream side, how to form the gradient of the drain pipe remains as a problem.

  In general, the pressure in the pipe fluctuates on the upstream side and the downstream side due to drainage passing through the drain pipe. In other words, miscellaneous wastewater drained from drainage equipment flows while pushing the air layer through the drainage pipe, so the pipe pressure before drainage is substantially constant, and the pipe pressure immediately after drainage gradually becomes positive pressure downstream. During drainage, the downstream side changes to a positive pressure and the upstream side changes to a negative pressure. Furthermore, the pipe pressure immediately before the end of drainage varies greatly.

  In each household, the laying state of the drainage is generally terminated at one place from various places such as a bathroom, a washroom, a sink and a toilet toward the merge header. Therefore, if the amount of drainage is large and the amount of air that is pushed away in the drainage pipe is large, the upstream side becomes negative pressure, leading to a “sucking phenomenon” in which the sealing water runs out in the trap of the drainage device. Also, on the downstream side, the positive pressure causes a “jumping phenomenon” that pushes the sealed water in the trap of the drainage pipe of another system through the merge header. For this reason, some kind of ventilation pipe construction has to be carried out when laying the drain pipe.

  The present invention solves the above-described problems, and performs a drainage pipe laying method based on the method of accuracy. At that time, a flexible drainage pipe is used and the work is easy. It is an object of the present invention to provide a drainage pipe laying method capable of performing a construction without damaging the pipe and making a ventilation pipe with an easy configuration against pressure fluctuations in the drainage pipe.

Therefore, the drainage pipe laying method according to the present invention is performed as follows. That is,
The invention according to claim 1 is a drainage pipe laying method in which a drain pipe, one end of which is connected to a drainage device, is laid through the sheath pipe, and the sheath pipe is curved or straight in the house. The drainage pipe is laid and formed with a single joint that is flexible with respect to a single sheath pipe, and is inserted through the sheath pipe so as to protrude from both ends of the sheath pipe. Thus, the drain pipe can be inserted and removed from the outflow side end of the sheath pipe.

  The invention according to claim 2 is characterized in that the sheath tube is formed with flexibility.

  The invention according to claim 3 is characterized in that the sheath pipe is arranged to incline downward toward the downstream side under the floor.

  According to a fourth aspect of the present invention, there is provided a drainage pipe laying method in which a drain pipe having one end connected to a drainage device is laid through the inside of the sheath pipe, and the one end of the sheath pipe faces the drainage equipment side. And the other end is arranged opposite to the confluence header where a plurality of drain pipes are gathered, and is laid in a curved or straight tube in the house, the drain pipe being connected to one sheath pipe By having a flexible and one formed without a joint, the other end is connected to the merging header, and the drainage pipe is inserted through the sheath pipe so as to protrude from both ends of the sheath pipe, The drainage pipe can be inserted and removed from the outflow side end of the sheath pipe.

  The invention according to claim 5 is a drainage pipe laying method in which a drain pipe having one end connected to a drainage device is laid through the inside of the sheath pipe, and the one end of the sheath pipe faces the drainage instrument side. And the other end is disposed opposite to the confluence header where a plurality of drain pipes are gathered, and is laid in a curved or straight tube in the house, and the sheath pipe is laid in a substantially horizontal direction under the floor. In addition, the drain pipe is supported by an in-pipe slope forming means capable of forming a slope in a direction in which the drain pipe is inclined downward toward the downstream side, and the drain pipe is flexible with respect to one sheath pipe. The drainage pipe can be inserted / removed from the outflow side end of the sheath pipe by being inserted through the sheath pipe so as to protrude from both ends of the sheath pipe. It is characterized by That.

  According to a sixth aspect of the present invention, the in-pipe gradient forming means includes a rail member that is mounted extending in the axial direction in the sheath pipe, and a latch that is mounted on the drain pipe and can be locked to the rail. A plurality of in-pipe supports having a hook member, and each of the in-pipe supports has a gradient by attaching the hook member to the drain pipe with the height position of the locking portion being variable. It is characterized by being comprised so that can be formed.

  According to a seventh aspect of the present invention, the in-pipe gradient forming means is attached to the rail member that extends in the axial direction inside the sheath pipe and is fitted to the drain pipe and can be locked to the rail member. A plurality of in-pipe supports having a plurality of eccentric grooves formed on the outer peripheral edge, and each of the in-pipe supports has different engaging grooves formed in the eccentric ring member. A gradient can be formed by attaching to the drain pipe in a state in which the eccentric ring is rotated while being sequentially engaged with the rail member.

  According to an eighth aspect of the present invention, there is provided an in-pipe support body, wherein the in-pipe gradient forming means includes a drain pipe support hole portion formed at a position eccentric with respect to the sheath tube and a ring portion fitted into the sheath tube. A plurality of the pipe supports are configured such that a gradient can be formed by mounting the ring portion on the drain pipe at a position where the ring portion is rotated in the sheath pipe.

  According to a ninth aspect of the present invention, the in-pipe gradient forming means includes a band body attached to the drain pipe, and a sheath pipe attachment having a height adjusting portion arranged at one place of the band body and capable of adjusting the height position. A plurality of in-pipe supports, each of which is configured so that a gradient can be formed by supporting the drain pipes at different height positions.

  The invention according to claim 10 includes an in-pipe support comprising: a pipe holding ring body attached to the drain pipe; and a semi-ring-shaped overlapping member attached to the pipe holding ring body while engaging in the sheath pipe. A plurality of bodies are provided, and each of the in-pipe supports having different number of stacking stages of the overlapping members is sequentially attached to the drain pipe so that a gradient can be formed.

  The invention according to claim 11 is characterized in that at least one vent hole is provided on the upper outer peripheral surface of the drain pipe inserted through the sheath pipe.

  In a twelfth aspect of the present invention, the vent is provided with a valve body capable of opening and closing the mouth.

  In the invention according to claim 13, the upper outer peripheral surface of the drain pipe inserted through the sheath pipe is provided with a vent on the upstream side and the downstream side, respectively, and the upstream vent and the downstream side. It is characterized in that a vent pipe for connecting to the vent is provided.

  The invention according to claim 14 is characterized in that rubber caps capable of sealing the inside of the sheath pipe are attached to both ends of the sheath pipe.

  The invention according to claim 15 is characterized in that the rubber cap is formed with a bypass passage for connecting different sheath pipes.

  According to the present invention, the operation of replacing the deteriorated drain pipe with a new drain pipe is performed by pulling one end of the drain pipe from the outflow side end of the sheath pipe after removing the drain pipe from the drainage device. The drainage pipe can be pulled out from. The flexible drain pipe does not need to be connected via a joint in particular, and can be formed by one from the drainage device to the end on the outflow side. For example, if the sheath tube is formed of a flexible member and is laid in a curved shape in the house, the sheath tube moves along the curved surface of the sheath tube, and can be detached from the sheath tube without any trouble during the movement. Can do. In addition, even if the sheath pipe is arranged in a straight tube with, for example, vinyl chloride, the drain pipe formed of one piece with flexibility has no obstacle to the sheath pipe when moving inside the sheath pipe. And can be pulled out from the outflow side end of the sheath tube.

  When a new drain pipe is attached to the drainage device, a new drainage pipe is inserted from the end portion on the outflow side of the sheath pipe and sent to the drainage device. Also in this case, since there is no obstacle when the drain pipe is inserted through the sheath pipe, it can be smoothly fed. Then, one end of the drain pipe is connected to the drainage device, and the other end is connected to the drain.

  Therefore, the drainage pipe installed in the house can be inserted and removed in the sheath pipe smoothly and in a short time because the drain pipe is formed of a single flexible joint. it can. Therefore, the work can be easily performed without damaging the building based on the accuracy method without peeling off the floor.

  Further, according to the present invention, when the other ends of the plurality of residential drain pipes, one end of which is connected to the drainage device, are concentrated on the merge header, an inspection port is normally formed on the floor in the vicinity of the merge header. Therefore, the drain pipe can be pulled out and replaced at the inspection port as described above. At this time, the respective sheath pipes are laid in a curved shape in the house so as to be gathered in one merge header. Therefore, it is possible to easily insert and remove the drain pipes that pass through the respective sheath pipes. In addition, since a drain pipe inserted into one Saya pipe is laid on the downstream side of the merge header, similarly, after removing one end of the drain pipe from the merge header, The drain pipe is pulled out from the section. Also in this case, the drain pipe can be easily pulled out.

  When a new drainage pipe is attached to the drainage device, the drainage pipe is inserted from the outflow side end of the sheath pipe and connected to the drainage fixture and the drainage basin as described above. Therefore, the work can be easily performed without damaging the building based on the accuracy method without peeling off the floor.

  Further, according to the present invention, when exchanging the drain pipe in an apartment house such as a condominium or an apartment, the other end of the drain pipe connected to the drainage device is connected to the merge header through the floor. Then, one end of the drain pipe is removed from the drainage device, the other end of the drain pipe is removed from the merge header, and then the merge header itself is removed. In a housing complex such as an apartment or an apartment, a fire prevention area is usually formed around the merge header so that the merge header can be inspected and cleaned. Therefore, after removing one end of the drainage pipe from the drainage device, the other end of the drainage pipe can be pulled out of the sheath pipe within the fire prevention area.

  When installing a new drainage pipe on the drainage device, after attaching the merge header in the fire prevention area, insert a new drainage pipe from the end of the sheath pipe and feed it to the drainage fixture. Then, one end of the drain pipe is connected to the drainage device, and the other end is connected to the merge header.

  As described above, the insertion / removal operation in the sheath pipe is performed by the fact that the sheath pipe and the drain pipe are flexible and are formed with one without a joint, and the laying in the house is curved. It can be performed smoothly and in a short time. Therefore, the work can be easily performed without damaging the building based on the accuracy method without peeling off the floor.

  In this case, since the underfloor height is low, the sheath pipe cannot be formed with a gradient under the floor and is installed in a substantially horizontal direction. The drain pipe is supported by various in-pipe gradient forming means in the sheath pipe, thereby forming a gradient that becomes a lower position toward the downstream side, so that the drainage can be sent to the downstream side. This in-pipe gradient forming means can form the gradient in the Saya pipe with a simple device, and the drain pipe can be moved in the Saya pipe, so the installation and replacement work of the drain pipe is easy and smooth. Can be done.

  Furthermore, in the present invention, the pressure fluctuation in the drain pipe can be suppressed by using the sheath pipe as an air passage. That is, if a vent hole is formed in at least one location of the drain pipe inserted through the sheath pipe and a vent hole is provided in the vent hole, positive pressure air from the drain pipe can be extracted. For example, by providing vents on the upstream and downstream sides of a drain pipe inserted through a single sheath pipe, and using the sheath pipe as an air passage, the downstream air that has become positive pressure is upstream that has negative pressure. The pressure fluctuation can be reduced by returning to the side. At this time, the drainage flowing in the drain pipe pushes the valve body of the vent hole. Since the drainage does not leak to the outside when the valve body closes the mouth, it is possible to vent the inside of the drainage pipe to the outside of the drainage pipe, and the drainage of the drainage can be performed simultaneously.

  In addition, a vent is provided at one location of the drain pipe, and rubber caps are attached to both ends of the sheath pipe through which the drain pipe is inserted. By forming a bypass hole connected to the drain pipe of another system in the rubber cap, it is possible to ventilate and connect to a drain pipe inserted through the inside of the other system. Also by this, the pressure fluctuation in the drain pipe can be suppressed. By suppressing the pressure fluctuation, the pressure applied to the downstream side can be reduced, so that the waste water does not flow into other drain pipes. Therefore, smooth drainage can be performed.

  Next, a drain pipe laying method according to an embodiment of the present invention will be described with reference to the drawings. The form described below is a first form in which a plurality of drain pipes are once laid in a detached house from a drainage device and gathered on a confluence header. In a housing complex such as an apartment or an apartment, the drainage pipe is a drainage device. The second embodiment connected to the drainage stack will be described. In addition, a drainage device means what drains using water in general households, such as a washing machine, a bath tub, a toilet, a kitchen stand, etc., for example.

In the case of the first form,
In this embodiment, a plurality of drainage devices 1 are arranged in the house 2 as shown in FIGS. Each drain pipe 3 having one end connected to each drainage device 1 is inserted into the sheath pipe 7 and the other end is connected to the merge header 9. Both ends of the drainage pipe 3 inserted through the Saya pipe 7 protrude from the Saya pipe 7. The drain pipe 3 is made of resin and has flexibility, and is formed with one joint without a joint in one sheath pipe 7. That is, conventionally, a straight pipe made of vinyl chloride is connected between the drainage device 1 and the merge header 9 while changing the direction with an elbow joint, but in the embodiment, a single drainage pipe 3 is used. To form. Since there is one drain pipe 3 in one sheath pipe 7, there is no need to use a joint.

  The sheath pipe 7 is disposed so that one end thereof is opposed to the drainage device 1 and the other end is opposed to the merging header 9. The sheath pipe 7 is made of resin and has flexibility, and in the house 2, it joins while forming a curved shape in plan view through the space between the floor 4 and the soil 5 from a position facing the drainage device 1. It is laid toward the header 9. The sheath pipe 7 is laid under the floor 4 while being supported by the support band 6 on the joists 4a of the floor 4 with a gradient that inclines downward toward the downstream side.

  As shown in FIG. 3, the merge header 9 of the embodiment forms a single outlet 92 on the downstream side by arranging the drain pipe connection ports 91 connected to the drain pipes 3 in a horned shape. In the present embodiment, since three drainage pipe connection ports 91 are used and five drainage devices 1 are connected, two merge headers 9 are connected in series. This merge header 9 is fixedly disposed below the floor 4. The outlet 92 on the downstream side has a larger diameter than the drain pipe connection port 91 on the upstream side.

  The drain pipe 3 having one end connected to the outlet 92 has the other end arranged outside the building foundation. The drainage pipe 3 laid outside from the merge header 9 is inserted through a sheath pipe 7 embedded in the foundation and extended to the outside and connected to a drainage tub (not shown).

  The merge header 9 may have a plurality of drain pipe 3 connection ports provided in a straight tubular cylinder extending in the horizontal direction instead of the shape described above. Of course, one outlet is provided on the downstream side.

  An inspection port 4b is formed in the floor 4 so as to be openable and closable above the junction header 9. By opening the inspection port 4b, the cleaning port 93 disposed in the merge header 9 is cleaned. In the embodiment of the present invention, the inspection port 4b is opened and the drainage pipe 3 is replaced.

  When exchanging the drainage pipe 3 laid as described above, the drainage pipe 3 laid in the house 2 is removed from the drainage device 1 on the one hand and removed from the merging header 9 on the other hand. Further, the drainage pipe 3 extending outward from the merging header 9 is removed from the merging header 9 on the one hand and removed from the drainage basin on the other hand.

  And in the position which opened the inspection port 4b, the drainage pipe 3 is pulled out from the outflow side edge part of the Saya pipe 7, and the drainage pipe 3 is pulled out from the outflow side edge part of the Saya pipe 7 outside the foundation which is not illustrated.

  Thereafter, a new drainage pipe 3 is inserted from the outflow side end of the sheath pipe 7 in the house 2, and a new drainage 3 is inserted from the outflow side end of the sheath pipe 7 outside the house 2. And the drain pipe 3 in the house is connected to each drainage device 1 and the merge header 9, and the drain pipe 3 outside the house is connected to the merge header 9 and the drainage basin.

  The drainage pipe 3 is smoothly inserted and removed by moving along the sheath pipe 7 laid in a curved shape because no joints are arranged on the drainage pipe 3. Even if the sheath pipe 7 is not formed with flexibility, the drain pipe 3 without joints can easily move in the sheath pipe 7.

  As described above, according to the drainage pipe laying method of the first embodiment, since the drain pipe 3 is formed with one joint and has flexibility, it is laid in a single curved shape. Further, it is possible to smoothly move in the sheath tube 7 or the sheath tube 7 laid in a straight tube shape, and the drain tube 3 can be easily replaced.

  Moreover, when laying out so that the some drainage pipe 3 may be collected on the confluence | merging header 9, the sheath pipe | tube 7 can be laid in curved shape. Since the drainage pipe 3 having flexibility can be inserted through the sheath pipe 7 along the sheath pipe 7 laid in a curved shape, the drain pipe 3 can be inserted and removed from the outflow side end of the sheath pipe 7. Therefore, it can be performed by an easy operation without peeling off the floor. Accordingly, the replacement work can be performed without damaging the building based on the quality assurance method.

  Next, the second embodiment will be described.

  Since this form is an apartment house such as an apartment or an apartment, the drain pipe 3 connected at one end to the drainage device 1 is connected to the drain stack at the other end. That is, as shown in FIG. 4, a fire prevention area (hereinafter referred to as a pipe space) 8 is provided at one end in the house 2, and a drainage stack 81 connected to each floor is erected in the pipe space 8. In the pipe space 8 on each floor, a merging header 9A connected to the drainage stack 81 is disposed.

  The sheath pipe 7 is disposed at a position where both ends face each other between the drainage device 1 and the merge header 9A. In the house 2, the sheath pipe 7 is laid in a curved shape through the floor. In this embodiment, since the underfloor height is low, the sheath pipe 7 cannot be formed with a gradient below the floor 4 and is laid so as to be in a substantially horizontal state.

  One end of the drain pipe 3 protrudes from the end of the sheath pipe 7 and is connected to the drainage device 1, and the other end projects from the end of the sheath pipe 7 and is connected to the junction header 9 </ b> A. The confluence header 9A is disposed in the pipe space 8, and the drainage pipe 3 is exchanged therein.

  In the interior of the sheath pipe 7, the drain pipe 3 is supported by a gradient forming portion (hereinafter referred to as an in-pipe support) 10 and is laid down so as to be lowered from the upstream side to the downstream side. Has been.

  The specific structure of the in-pipe support 10 is configured as follows with various configurations. For example, in the first embodiment, as shown in FIGS. 5 to 6, the in-pipe support body 10 </ b> A includes a rail 11 and a band body 12 that are integrally formed with the sheath pipe 7. A pair of rails 11 are formed so as to face the inner peripheral surface of the sheath tube 7 along the axial direction. The rail 11 is formed so as to protrude in the axial direction from the inner peripheral surface of the sheath tube 7, and a concave locking groove 111 is formed on the upper surface. On the other hand, the band body 12 includes an arc-shaped band portion 121 that engages with a part of the outer peripheral surface of the drain pipe 3, and a hook portion 122 that is disposed at the tip of the band portion 121. A hook 123 that engages with the locking groove 111 of the rail 11 is formed in the hook portion 122.

  As shown in FIG. 6, the band body 12 is formed with a plurality of band portions 121 having different depths, and is attached to the drain pipe 3 from the upstream side toward the downstream side in ascending order of depth. The band portion 121 is formed with elasticity, and is formed so as to be urged in a direction in which the drain pipe 3 is tightened when the band section 121 is attached to the drain pipe 3.

  In the in-pipe support 10 </ b> A <b> 1 of FIG. 6A, since the band portion 121 is shallow, the hook portion 122 is located below the drainage pipe 3, and the hook 123 is connected to the locking groove 111 of the rail 11. The drain pipe 3 to which the band part 121 is attached is arranged at an upper position in the sheath pipe 7.

  In the in-pipe support body 10A2 in FIG. 6B, the band portion 121 is formed deeper than the band portion 121 of the in-pipe support body 10A1. Therefore, when the band part 121 is attached to the drain pipe 3, the hook part 122 is disposed above the drain pipe 3, and when the hook 123 of the band body 12 is locked to the locking groove 111 of the rail 11, the drain pipe 3 is It arrange | positions in the position lower than the position of the drain pipe 3 of support body 10A1.

  In the in-pipe support body 10A3 of FIG. 6C, the depth of the band portion 121 is formed deeper. When the band body 12 is attached to the rail 11 in the same manner as described above, the drain pipe 3 becomes the drain pipe of the in-pipe support body 10A2. It is arranged at a position lower than the position 3.

  In the in-pipe support body 10A4 of FIG. 6D, the depth of the band part 121 is formed deeper than the band part 121 of the in-pipe support body 10A3, and the drainage pipe 3 is at a position lower than the position of the in-pipe support body 10A3. Be placed.

  Accordingly, the pipe support 10A1 is mounted on the upstream side, and the pipe support 10A2, the pipe support 10A3, and the pipe support 10A4 are arranged in this order, so that the drainage pipe 3 is lowered from the upstream side toward the downstream side. A simple gradient can be formed. As a result, the waste water flowing through the drain pipe 3 flows downstream.

  As shown in FIGS. 7 to 8, the in-pipe support body 10 </ b> B of the second form is composed of a rail 13 and a grooved eccentric ring 14 formed on the sheath pipe 7. The rail 13 is formed on the inner peripheral surface of the sheath pipe 7 so as to extend in one axial direction. The rail 13 has a substantially V-shaped cross section. The grooved eccentric ring 14 is formed at a position where the fitting hole 141 fitted to the drain pipe 3 is eccentric with respect to the outer peripheral surface 142. A plurality of V-shaped grooves 143 are formed on the outer peripheral surface 142 in the radiation direction.

  A plurality of grooved eccentric rings 14 are formed, and as shown in FIG. 8, by fitting any V-shaped groove 143 to the rail 13, the grooved eccentric ring 14 is rotated and the drain pipe 3. The height position is adjusted.

  8A, the V-shaped groove 143a formed in a direction perpendicular to the line connecting the central axis of the drain pipe 3 and the central axis of the sheath pipe 7 is fitted to the rail 13. I am letting. The drainage pipe 3 is arranged at a substantially top dead center position in the sheath pipe 7 in the figure.

  In the in-pipe support body 10B2 of FIG. 8B, the grooved eccentric ring 14 is rotated counterclockwise, and the V-shaped groove 143b adjacent to the V-shaped groove 143a of the in-pipe support body 10B1 is formed on the rail 13. Mating. Since the drainage pipe 3 is in a position rotated counterclockwise from the top dead center position, the drainage pipe 3 is disposed at a position lower than the in-pipe support body 10B1.

  In the in-tube support 10B3 in FIG. 8C, the grooved eccentric ring 14 is further rotated counterclockwise, and several V-shaped grooves 143c adjacent to the V-shaped groove 143b of the in-tube support 10B2 are provided. The rail 13 is fitted. The drain pipe 3 is arranged at a position directly beside the central axis of the sheath pipe 7. Therefore, the drain pipe 3 is disposed at a position lower than the drain pipe 3 of the in-pipe support 10B2.

  In the in-pipe support body 10B4 in FIG. 8D, the grooved eccentric ring 14 is further rotated counterclockwise, and several V-grooves 143d adjacent to the V-shaped groove 143c of the in-pipe support body 10B3. Is fitted to the rail 13. The drainage pipe 3 is disposed below the position right next to the central axis of the sheath pipe 7. Therefore, the drain pipe 3 is disposed at a position lower than the drain pipe 3 of the in-pipe support 10B3.

  In the in-pipe support body 10B5 of FIG. 8 (e), the grooved eccentric ring 14 is further rotated counterclockwise, and the V-shaped groove formed on the opposite side of the in-pipe support body 10B1 from the V-shaped groove 143a. 143 e is fitted to the rail 13. The drain pipe 3 is disposed at the bottom dead center position in the sheath pipe 7. Therefore, the drain pipe 3 is disposed at a position lower than the drain pipe 3 of the in-pipe support 10B4.

  Therefore, by attaching the pipe support 10B1 to the upstream side and arranging the pipe support 10B2, the pipe support 10B3, the pipe support 10B4, and the pipe support 10B5 in this order, the drain pipe 3 is directed from the upstream side toward the downstream side. A gradient can be formed so as to be at a low position. As a result, the waste water flowing through the drain pipe 3 flows downstream.

  In addition, in this in-pipe support body 10C of this form, a rail may be formed in a cross-sectional perfect circle shape, and the V-shaped groove | channel of a grooved eccentric ring may be formed in circular arc shape.

  As shown in FIG. 9, the in-pipe support body 10 </ b> C of the third embodiment is integrally provided with a drain pipe support hole 151 that fits outside the drain pipe 3 and a ring part 152 that fits inside the sheath pipe 7. A ring body 15 is provided. The central axis of the drain pipe support hole 151 and the central axis of the ring part 152 are in an eccentric position, and the eccentric ring body 15 is attached to the drain pipe 3 by expanding the drain pipe support hole 151 on one side. For this purpose, a pair of slit portions 154 is formed with one opening 153 and one opening 153 in between. A plurality of the eccentric ring bodies 15 are formed, and the height position of the drain pipe 3 is adjusted by mounting the eccentric ring body 15 in the axial direction of the sheath pipe 7 at a position where the eccentric ring body 15 is rotated with respect to the sheath pipe 7. Thus, the gradient of the drain pipe 3 is formed.

  That is, in the in-pipe support body 10C1 in FIG. 9A, the opening 153 of the eccentric ring body 15 attached to the drainage pipe 3 is arranged at a position facing upward, and the eccentric ring body 15 is placed inside the sheath pipe 7. It is attached to. In this position, the drain pipe 3 is located above the sheath pipe 7 (top dead center position).

  In the in-pipe support body 10C2 in FIG. 9B, the eccentric ring body 15 is in a position rotated counterclockwise. The opening 153 rotates counterclockwise from the position of the top dead center, and the drainage pipe 3 rotates counterclockwise from the top dead center position. Therefore, the opening 153 is disposed at a low position from the position of the in-pipe support 10C1.

  In the in-pipe support body 10C3 of FIG. 9C, the eccentric ring body 15 is in a position further rotated counterclockwise. The opening 153 moves to a position directly beside the sheath pipe 7, and the drain pipe 3 is disposed at a lower position because it rotates counterclockwise from the position of the in-pipe support 10C2.

  In the in-pipe support body 10C4 shown in FIG. 9D, the eccentric ring body 15 is further rotated counterclockwise. The opening 153 rotates further counterclockwise from the position of the in-pipe support 10C3, and the drainage pipe 3 rotates further counterclockwise from the position of the in-pipe support 10C3. Is done.

  In the in-pipe support body 10C5 of FIG. 9 (e), the eccentric ring body 15 is in a position further rotated counterclockwise. The opening 153 further rotates counterclockwise from the position of the in-tube support 10C3 and faces downward, and the drain pipe 3 further rotates counterclockwise from the position of the in-tube support 10C3 to reach the bottom dead center position. .

  Therefore, by attaching the pipe support 10C1 to the upstream side and arranging the pipe support 10C2, the pipe support 10C3, the pipe support 10C4, and the pipe support 10C5 in this order, the drain pipe 3 moves from the upstream side toward the downstream side. A gradient can be formed so as to be at a low position. As a result, the waste water flowing through the drain pipe 3 flows downstream.

  In the pipe support 10C in this form, in order to prevent the diameter of the opening 153 of the eccentric ring body 15 attached to the drain pipe 3, a fastening body such as a binder is provided around the drain pipe support hole. It may be wound with.

  As shown in FIGS. 10 to 11, the in-pipe support body 10 </ b> D of the fourth embodiment includes a band member 16 wound around the drain pipe 3. The band member 16 is integrally formed with a folding mechanism 17 formed in a pantograph shape and a sheath pipe mounting portion 18 disposed above the folding mechanism 17. The folding mechanism 17 includes a pair of bendable / extendable parts 171 arranged in the vertical direction and a screw member 172 arranged in the horizontal direction so as to be able to bend and extend. A female screw is formed in one of the pair of bending / extending portions 171, and the male screw of the screw member 172 is rotated to move the one bending / extending portion 171 a in the horizontal direction. As a result, the pair of bending / extending portions 171 bends and stretches to allow the band member 16 to move in the height direction.

  The sheath tube mounting portion 18 is formed so as to be able to be locked to a rail 19 formed integrally with the sheath tube 7. The rail 19 is formed by opening, along the axial direction, the central portion of the lower surface of the concave projecting portion that projects in the axial direction from the inner peripheral surface of the sheath tube 7. By forming the Saya tube mounting portion 18 into a T-shaped cross section, the Saya tube mounting portion 18 is mounted so that it can be suspended from the Saya tube 7 by being locked into the rail 19 from the opening portion of the rail 19.

  A plurality of band members 16 having a folding mechanism 16 are formed and wound around the drainage pipe 3, and are attached to the drainage pipe 3 in the axial direction at a position adjusted in height relative to the sheath pipe 7. The height of the drainage pipe 3 is adjusted by adjusting the height position.

  That is, in the in-pipe support body 10D1 of FIG. 11A, the screw member 172 is rotated so as to bend the pair of bending / extending portions 171 of the folding mechanism 17. The drainage pipe 3 wound around the band member 16 reaches an upper position in the sheath pipe 7 by bending of the folding mechanism 17.

  In the in-pipe support body 10D2 in FIG. 11B, the screw member 172 is rotated so that the bending / extending portion 171 of the folding mechanism 17 is extended from the in-pipe support body 10D1. The drainage pipe 3 wound around the band member 16 is moved downward with respect to the sheath pipe 7 by extension of the bending / extending part 171. Therefore, the drain pipe 3 is disposed at a lower position than the in-pipe support 10D1.

  In the in-pipe support body 10D3 of FIG. 11C, the screw member 172 is rotated so that the bending portion 171 of the folding mechanism 17 is further extended from the in-pipe support body 10D2. The drainage pipe 3 wound around the band member 16 is moved further downward with respect to the sheath pipe 7 by the extension of the bending part 171. Therefore, the drain pipe 3 is disposed at a lower position than the in-pipe support body 10D2.

  Therefore, by attaching the in-pipe support 10D1 to the upstream side and arranging the in-pipe support 10D2 and the in-pipe support 10D3 in this order, the drain pipe 3 forms a gradient so that the drainage pipe 3 becomes a lower position from the upstream side to the downstream side. be able to. As a result, the waste water flowing through the drain pipe 3 flows downstream.

  As shown in FIG. 12, the in-pipe support body 10 </ b> E of the fifth form is a semi-ring shape that fits into the drain pipe holding ring portion 201 that fits outside the outer peripheral surface of the drain pipe 3 and the inner circumference surface of the sheath pipe 7. The supporting member 20 including the overlapping member 202 is attached to the drain pipe 3 and the sheath pipe 7. An opening 201 a is formed in the drain pipe holding ring part 201 at a position opposite to the overlapping member 202 so that the diameter of the drain pipe 3 can be increased. In addition, the height of the support member 20 is changed by overlapping the overlapping members 202, and a plurality of support members 20 having different heights are formed and arranged side by side in the axial direction of the sheath pipe 7 to the drain pipe 3. A gradient can be formed and supported. As shown in FIG. 12, the semi-ring-shaped overlapping member 202 has a flange portion and is formed so as to be able to engage with the overlapping overlapping member 202, but the outermost overlapping member facing the Saya tube 7. A flange portion is not formed on 202 a, and a slidable sliding member 203 is attached to the inner peripheral surface of the sheath pipe 7.

  That is, in the in-pipe support body 10E1 of FIG. 12A, since the overlapping members 202 of the support member 20 are stacked in five stages, the height of the support member 20 is increased. When the support member 20 is fitted into the drainage pipe 3 and mounted below the sheath pipe 7, the drainage pipe 3 is disposed at an upper position in the sheath pipe 7 because the height of the support member 20 is high. Note that the sliding member 203 of the outermost overlapping member 202 a is in contact with the inner peripheral surface of the sheath tube 7.

  In the in-pipe support 10E2 in FIG. 12B, the overlapping member 202 is reduced by one step to four steps as compared with the in-pipe support 10E1 in FIG. Therefore, it becomes lower than the support member 20 of the in-pipe support body 10E1 in FIG. 12A, and the drain pipe 3 is disposed at a lower position than the in-pipe support body 10E1. Note that the sliding member 203 of the outermost overlapping member 202 a is in contact with the inner peripheral surface of the sheath tube 7.

  In the in-pipe support body 10E3 in FIG. 12C, the overlapping member 202 is further reduced by one stage compared to the in-pipe support body 10E2 in FIG. Therefore, it becomes lower than the support member 20 in FIG.12 (b), and the drainage pipe 3 is arrange | positioned in the lower position further than the support body 10E2. Note that the sliding member 203 of the outermost overlapping member 202 a is in contact with the inner peripheral surface of the sheath tube 7.

  In the in-pipe support body 10E4 in FIG. 12D, the overlapping member 202 is reduced by one stage to two stages as compared with the in-pipe support body 10E3 in FIG. Therefore, it becomes lower than the support member 20 in FIG.12 (c), and the drain pipe 3 is arrange | positioned in the lower position rather than the support body 10E3 in pipe | tube. Note that the sliding member 203 of the outermost overlapping member 202 a is in contact with the inner peripheral surface of the sheath tube 7.

  In the in-pipe support 10E5 in FIG. 12 (e), the overlapping member 202 is reduced by one step compared to the in-pipe support 10E4 in FIG. Therefore, it becomes lower than the support member 20 in FIG.12 (d), and the drainage pipe 3 is arrange | positioned in the lower position further than the pipe | tube support body 10E4. Note that the sliding member 203 of the overlapping member 202 a is in contact with the inner peripheral surface of the sheath tube 7.

  Therefore, by attaching the pipe support 10E1 to the upstream side and arranging the pipe support 10E2, the pipe support 10E3, the pipe support 10E4, and the pipe support 10E5 in this order, the drain pipe 3 moves from the upstream side toward the downstream side. A gradient can be formed so as to be at a low position. As a result, the waste water flowing through the drain pipe 3 flows downstream.

  In addition, each in-pipe support body 10 of each form in the laying method of the drain pipe of the second form is configured to be able to move in the sheath pipe 7 with the drain pipe 3 attached.

  As described above, in the drainage pipe laying method according to the third embodiment, in the case where a slope is formed in the drainage pipe 3 in the sheath pipe 7 laid in a substantially horizontal direction, in any pipe support 10, Since the in-pipe support 10 can be configured in the pipe 7, the waste water flowing through the drain pipe 3 can flow from the upstream side toward the downstream side. In addition, any of the in-pipe supports 10 can support the drainage pipe 3 with a compact configuration, and can move relative to the sheath pipe 7 with the drainage pipe 3 attached. Therefore, the deteriorated drain pipe 3 can be inserted and removed from the end of the sheath pipe 7, and can be replaced without damaging the building based on the accuracy method.

  FIG. 14 shows a form in which a vent is attached to the upper part of the above-mentioned drain pipe. One drain pipe 3 having one end connected to a drainage device (not shown) and the other end connected to the merge header 9 is one. And a vent hole 31 (see FIG. 15) is formed in the upper portion of the drainage pipe 3 in the sheath pipe 7. Rubber caps 35 are attached to both ends of the sheath tube 7.

  The vent hole 31 is formed at one location on each of the upstream side and the downstream side, and the vent hole 31 is provided with a vent hole for preventing drainage leakage (hereinafter simply referred to as a vent hole) 32. When the ventilation holes 32 are provided at two locations in the upper part of the drainage pipe 3 in one sheath pipe 7, the rubber cap 35 is fitted with a bypass plug 355 to be described later, and a mesa plug 36 is attached to the inside of the sheath pipe 7. Is formed as a ventilation path. As a result, the downstream air layer that has been drained and has a positive pressure returns to the upstream side that has a negative pressure through the inside of the sheath pipe 7.

  As shown in FIG. 15, the vent hole 31 used in the embodiment is opened on the upper outer peripheral surface of the drain pipe 3 with, for example, a horuseau or the like, and the vent hole 32 is attached.

  As shown in FIG. 16, the vent 32 according to the embodiment includes a cover 321 having an arc cross section covering the upper outer peripheral surface of the drain pipe 3, and a side frame 323 and a bottom frame 324 disposed below the cover 321. A frame portion 322, a tapered tube portion 325 having a mouth portion 325a on the upper surface portion and narrowing upward, and a spherical valve body 326 movable in the vertical direction within the frame portion 322. ing. The spherical valve body 326 is disposed so as to be able to open and close the mouth portion 325a of the tapered tube portion 325.

  FIG. 17 shows the state of the vent 32 due to the pressure fluctuation in the drain pipe 3. When the pressure near the vent 32 is negative, the spherical valve body 326 is shown in FIG. Since it moves downward due to its own weight, an air layer enters the pipe from the mouth portion 325a, and the pressure in the vicinity of the vent 32 in the drain pipe 3 is increased.

  When the pressure in the vicinity of the vent 32 is positive, as shown in FIG. 17B, the air layer is discharged from the mouth 325a to the outside to release the pressure in the pipe. At the same time, the spherical valve body 326 To raise.

  When the vicinity of the vent 32 of the drain pipe 3 is full of drainage, the drainage pushes up the spherical valve body 326 and closes the mouth 325a as shown in FIG. Therefore, the drainage is folded back into the pipe without leaking outside the drain pipe 3.

  As shown in FIGS. 18 to 19, the rubber cap 35 has a disc-shaped main body portion 351 formed of a rubber material and a first flange portion 352 that fits on the outer peripheral surface of the sheath tube 7. It is formed to protrude from 351 to one side. The main body 351 has an insertion hole 353 through which the drain pipe 3 is inserted, and a second flange 354 that fits around the insertion hole 353 to the outer peripheral surface of the drain pipe 3. 352 projecting in the same direction as 352. Further, a bypass passage 355 is formed adjacent to the upper side of the second flange portion 354 and a third flange protruding from the main body portion 351 toward the opposite side of the first flange portion 352 around the bypass passage 355. A portion 356 is formed. The bypass passage 355 is provided with either a connection plug hose 37 or a connection hose 37 connected to the bypass passage 355 of another rubber cap 35 to form an air ventilation path in the sheath pipe 7.

  That is, as shown in FIG. 14, when a single sheath pipe 7 is provided with the vent holes 32 on the upstream side and the downstream side and connected by the vent pipe 3, the bypass of the rubber caps 35 at both ends is provided. A mechlet plug 36 is attached to the passage 355. In addition, as shown in FIG. 20, when the vent hole 32 is provided at one place in one sheath pipe 7, the rubber cap 35 attached to the sheath pipe 7 through which another drain pipe 3 is inserted. The bypass passages 355 are connected by a connection hose 37. As a result, an air passage for air discharged from the vent 32 is formed inside the sheath pipe 7. In this case, the other plug passage 355 that is not connected to the connection hose 37 is fitted with the mechlet plug 36. The connection hose 37 is formed to be flexible.

  If the rubber caps 35 are attached to both ends of the sheath pipe 7, even if there is leakage of drainage from the vent 32, drainage to the outside of the sheath pipe 7 with the rubber cap 35 on the downstream side in particular. Leakage can be prevented.

  As described above, by providing a vent 32 in the drain pipe 3 and attaching rubber caps 35 to both ends of the sheath pipe 7 in one sheath pipe 7, pressure fluctuation due to drainage flowing in the drain pipe is suppressed. Since the inside of the sheath pipe 7 can be formed as an air passage, the flow of drainage can be performed smoothly. Since the drainage pipe 3 to which the vent hole 32 is attached is disposed in the sheath pipe 7, it does not affect the operation of pulling out the drainage pipe 3 from the sheath pipe 7.

  21 to 22 show a state where drainage pipes are laid in a place with a low floor height in an apartment house such as an apartment. A single sheath pipe 7 is laid in a substantially horizontal direction on the soil space 5, and the drain pipe 3 is formed in a gradient in the sheath pipe 7 and inserted therethrough. Rubber caps 35 are attached to both ends of the sheath tube 7 so that the interior of the sheath tube 7 is formed as an air ventilation path. The sheath pipe 7 is supported on the earth 5 by a plurality of support fittings 40 that support the outer peripheral surface of the sheath pipe 7. The support fitting 40 includes a pair of semi-circular grip rings 41 and 41 arranged opposite to each other, and a pair of screw members 42 and 42 whose heights can be adjusted by connecting both ends of the pair of grip rings 41 respectively. ing. A plurality of support fittings 40 are arranged on the outer peripheral surface of one sheath tube 7 at appropriate intervals. Moreover, the height position can be appropriately adjusted in each part of the sheath pipe 7 by moving each grip ring 41 up and down by the screw member 42.

  The drainage pipe 3 is formed with an eccentric ring 43 (the grooved eccentric ring 14 shown in FIG. 8 or the grooved eccentric ring 14 shown in FIG. 8 or FIG. 9) in order to form a slope in the sheath pipe 7 that is inclined downward from the upstream side toward the downstream side. It is supported by an in-tube support 10 having an eccentric ring 15). A plurality of in-pipe supports 10 are arranged in an appropriate manner within one sheath pipe 7.

  In the illustrated example, the vent 32 arranged on the upper outer peripheral surface of the drain pipe 3 is arranged at one place in one sheath pipe 7, so that the bypass passage of the rubber cap 35 arranged on the upstream side. 355 is equipped with a plug 37, and a bypass passage 355 of the rubber cap 35 disposed on the downstream side is fitted with one end of a connection hose that connects to another system of a sheath pipe.

  Accordingly, when drainage flows into the drain pipe 3 and the pressure in the pipe rises, air is discharged from the vent 32 and flows into the sheath pipe 7. In the sheath tube 7, the air moves downstream and flows out from the bypass passage 355 of the rubber cap on the downstream side toward the piping of another system.

It is a schematic plan view which shows the construction method of the drain pipe by the 1st form of this invention. It is the same simplified front sectional view. It is a top view which shows the merge header of one form in FIG. It is a schematic plan view which shows the construction method of the drain pipe by the 2nd form of this invention. It is a front view which shows the laying state of the sheath pipe in a 2nd form. It is sectional drawing which shows the state which forms a gradient with the in-pipe support body of the 1st form. It is a perspective view which shows the support body in a pipe | tube of the 2nd form. It is sectional drawing which shows the state which forms a gradient with the in-pipe support body of the 2nd form. It is sectional drawing which shows the state which forms a gradient with the in-pipe support body of the 3rd form. It is a perspective view which shows the support body in a pipe | tube of the 4th form. It is sectional drawing which shows the state which forms a gradient with the in-pipe support body of the 4th form. It is sectional drawing which shows the state which forms a gradient with the in-pipe support body of the 5th form. It is a simplified top view which shows the laying state of the conventional drain pipe. It is a simple perspective view which shows the laying state of the drain pipe which attached the vent hole to two places. It is a partial front view which shows the detail of the laying state of FIG. FIG. It is an effect | action figure which shows the vent hole in FIG. It is a front view which shows the rubber cap in FIG. FIG. It is a simple perspective view which shows the laying state of the drain pipe which attached the vent hole to two places. FIG. 6 is a simplified perspective view showing a state in which a drain pipe provided with a vent is laid in the sheath pipe 7 with a gradient. It is the simple perspective view seen from the same front.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Drainage device 2, House 3, Drain pipe 4, Floor 7, Saya pipe 9, Junction header 10, In-pipe support body (In-pipe gradient forming means)
11, rail 111, locking groove 12, band body 122, hook part 13, rail 14, grooved eccentric ring 141, fitting hole 143, V-shaped groove 15, eccentric ring body 151, drain pipe support hole part 16 , Band member 17, folding mechanism 19, rail 20, support member 202, splash member 31, vent 32, vent 321, cover 324, frame 325a, port 326, spherical valve body 33, vent pipe 34, rubber Cap 351, main body 353, insertion hole 355, bypass passage 36, meckle plug 37, connection hose

Claims (15)

A drainage pipe laying method in which a drainage pipe, one end of which is connected to a drainage device, is laid through the inside of a sheath pipe,
The sheath pipe is laid in a curved or straight tube in the house,
The drain pipe has flexibility with respect to one Saya pipe and is formed with one without a joint, and by passing through the Saya pipe so as to protrude from both ends of the Saya pipe,
A drainage pipe laying method characterized in that the drainage pipe can be inserted and removed from the outflow side end of the sheath pipe.   The drain pipe laying method according to claim 1, wherein the sheath pipe is formed with flexibility.   The drainage pipe laying method according to claim 1 or 2, wherein the sheath pipe is disposed so as to incline downward toward the downstream side under the floor. A drainage pipe laying method in which a drainage pipe having one end connected to a drainage device is inserted through a sheath pipe and laid,
The sheath pipe is arranged with one end facing the drainage device side and the other end facing the merge header where a plurality of drainage pipes are gathered, and is laid in a curved or straight tube in the house,
The drain pipe is flexible with respect to one sheath pipe and is formed with one without a joint, and the other end is connected to the merge header,
A drainage pipe laying method characterized in that the drainage pipe can be inserted and removed from the outflow side end of the sheath pipe by inserting the drain pipe into the sheath pipe so as to protrude from both ends of the sheath pipe. . A drainage pipe laying method in which a drainage pipe having one end connected to a drainage device is inserted through a sheath pipe and laid,
The sheath pipe is arranged with one end facing the drainage device side and the other end facing the merge header where a plurality of drainage pipes are gathered, and is laid in a curved or straight tube in the house,
The sheath pipe is laid in a substantially horizontal direction under the floor, and is supported by an in-pipe gradient forming means capable of forming a gradient in the direction in which the drain pipe is inclined downward toward the downstream side in the sheath pipe,
The drain pipe is formed with one without a joint having flexibility with respect to one Saya pipe, and by passing through the Saya pipe so as to protrude from both ends of the Saya pipe, A drainage pipe laying method characterized in that the drainage pipe can be inserted and removed from the outflow side end of the sheath pipe.   A rail member attached to the inner slope forming means so as to extend in the axial direction inside the sheath pipe; and a hook member attached to the drain pipe and having a locking portion that can be locked to the rail. A plurality of in-pipe supports, each of the in-pipe supports being configured such that a gradient can be formed by mounting the hook member on the drain pipe with the height position of the locking portion being variable. 6. The drain pipe laying method according to claim 5, wherein the drain pipe is laid.   The in-pipe gradient forming means includes a rail member that extends in the axial direction in the sheath pipe, and a plurality of locking grooves that are fitted on the drain pipe and can be locked to the rail member. A plurality of in-pipe supports each having an eccentric ring member formed in the portion, and each of the in-pipe supports supports a different locking groove formed in the eccentric ring member sequentially on the rail member. 6. The drain pipe laying method according to claim 5, wherein a gradient can be formed by mounting the eccentric ring on the drain pipe in a rotated state.   The in-pipe gradient forming means has a plurality of in-pipe supports including a drain pipe support hole portion formed at a position eccentric with respect to the sheath tube and a ring portion fitted into the sheath tube. 6. The drain pipe laying method according to claim 5, wherein the support body is configured to form a gradient by mounting the ring portion on the drain pipe at a position where the ring portion is rotated in the sheath pipe. .   An in-pipe support provided with the in-pipe gradient forming means comprising: a band body to be attached to the drain pipe; and a sheath pipe mounting member having a height adjusting portion arranged at one position of the band body and capable of adjusting the height position 6. The drain pipe laying according to claim 5, wherein each of the pipe supports is configured to form a gradient by supporting the drain pipe at different height positions. Construction method.   A plurality of in-pipe supports comprising: a pipe holding ring body attached to the drain pipe; and a semi-ring-like overlapping member attached to the pipe holding ring body while engaging in the sheath pipe, 6. The drainage pipe laying method according to claim 5, wherein a gradient can be formed by attaching the support bodies in pipes having different numbers of stacking members to the drainage pipe in order.   The drain pipe laying method according to any one of claims 1 to 10, wherein at least one vent hole is disposed on an upper outer peripheral surface of the drain pipe inserted through the sheath pipe.   The drain pipe laying method according to claim 11, wherein a valve body capable of opening and closing the opening is disposed in the vent.   The upper outer peripheral surface of the drain pipe inserted through the sheath pipe is provided with vents on the upstream side and the downstream side, respectively, and connects the upstream side vent and the downstream side vent. 11. A drainage pipe laying method according to claim 1, wherein a trachea is provided.   The drain pipe laying method according to claim 10, 11, 12, or 13, wherein rubber caps capable of sealing the inside of the sheath pipe are attached to both ends of the sheath pipe.   The drain pipe laying method according to claim 14, wherein a bypass passage for connecting different sheath pipes to each other is formed in the rubber cap.

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