JP2006002886A - Drain pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain pipe having a maximum outer diameter size reduced as much as possible while securing seal material holding force and preventing the removal of a seal material from a socket. <P>SOLUTION: The drain pipe comprises the seal material 20 as a member for sealing between the socket 13 and a pipe to be inserted, consisting of a seal body 22 and a peripheral edge 24, the peripheral edge 24 covering a front end face 13f of the socket 13, and a seal material holding cover 30 having a cylindrical portion 32 covering a outer peripheral face 13r of the socket 13 and an inner flange portion 34 formed at the front end of the cylindrical portion 32 for holding the seal material 20 at the front end of the socket 13 with the inner flange portion 34 pressing the seal material 20 at its peripheral edge 24. The socket 13 is inserted into the cylindrical portion 32 of the seal material holding cover 30. In the state that the seal material 20 is held at its peripheral edge 24 between the inner flange portion 34 of the seal material holding cover 30 and the front end face 13f of the socket 13 and elastically deformed, the seal material holding cover 30 is fixed to the outer peripheral face 13r of the socket 13 with fixing means 13m, 36. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drainage pipe that is mainly used in a drainage system of an apartment house and has a pipe connection receiving port formed at an end of a pipe body.

A technique relating to the drain pipe described above is described in Patent Document 1.
This drain pipe 50 is a fireproof double-layer pipe, and as shown in FIG. 5, includes a resin inner pipe 51, and a lower pipe (not shown) of a drain pipe joint is provided above the inner pipe 51. A receiving port 51w to be inserted is formed. An inner peripheral groove 51m is formed in the vicinity of the tip (upper end) of the receiving port 51w, and a ring-shaped sealing material 55 is engaged and held in the inner peripheral groove 51m. Since the outer peripheral surface of the receiving port 51w is enlarged by the amount corresponding to the recess of the inner peripheral groove 51m, the outer diameter dimension is maximized at the position of the inner peripheral groove 51m. Furthermore, the straight pipe portion of the inner pipe 51 and the periphery of the receiving port 51w are covered with an outer pipe 52 formed of mortar containing refractory fibers.

JP 2001-187985 A

Since the drain pipe 50 described above is configured to engage and hold the ring-shaped sealing material 55 in the inner circumferential groove 51m of the receiving port 51w, a sufficient holding force of the sealing material 55 can be ensured even if an adhesive or the like is used. Is difficult. For this reason, when the lower piping of the drainage pipe joint is inserted into the receiving port 51w, if the lower piping is caught by the sealing material 55, the sealing material 55 is detached from the inner circumferential groove 51m of the receiving port 51w, and a sealing failure occurs. There are things to do.
Further, since the receiving port 51w has a configuration in which the outer peripheral surface is increased in diameter by the recess of the inner peripheral groove 51m, the maximum outer diameter of the drain pipe 50 is relatively large. The maximum outer diameter of the drain pipe 50 is desirably as small as possible considering the case where the drain pipe 50 is passed through a through-hole or the like.

  The present invention has been made to solve the above-described problems, and a technical problem of the present invention is to ensure a sufficient holding force of the sealing material so that the sealing material does not come off from the receiving port. At the same time, the maximum outer diameter of the drain pipe is to be made as small as possible.

The above-described problems are solved by the inventions of the claims.
Invention of Claim 1 is a member which seals between the receiving port for piping connection currently formed in the edge part of a pipe body, and the piping inserted in the receiving port, and the receiving port, A seal body part and a peripheral part Comprising a sealing material whose peripheral portion covers the tip end surface of the receptacle, a cylindrical portion covering the outer peripheral surface of the receptacle, and an inner flange portion formed at the tip of the cylinder portion, A drain pipe having a sealing material holding cover that holds the sealing material at a tip of the receiving port by pressing a peripheral edge of the sealing material with a flange portion, and the receiving port is located with respect to the cylindrical portion of the sealing material holding cover The sealing material holding cover is inserted into the receiving port by a fixing means in a state where the peripheral portion of the sealing material is sandwiched between the inner flange portion of the sealing material holding cover and the front end surface of the receiving port and is elastically deformed. Outside Characterized in that it is configured to be secured to a surface.

According to the present invention, the fixing means is configured such that the receiving port is inserted into the cylindrical portion of the sealing material holding cover, and the peripheral portion of the sealing material is sandwiched between the inner flange portion of the sealing material holding cover and the front end surface of the receiving port. The sealing material holding cover can be fixed to the outer peripheral surface of the receiving port in a state of being elastically deformed. That is, with the sealing material holding cover fixed to the receiving port, the peripheral edge of the sealing material is sandwiched between the inner flange portion of the sealing material holding cover and the front end surface of the receiving port, and held in that position in an elastically deformed state. Is done. Therefore, when the fixing means is operated, the elastic deformation state of the peripheral portion of the sealing material, that is, the clearance between the inner flange portion of the sealing material holding cover and the front end surface of the receiving port is adjusted, thereby holding the sealing material. Enough power can be secured. As a result, when the pipe is inserted into the receiving port, even if the pipe is caught by the sealing material, the sealing material is hardly detached from the receiving port.
Further, since the peripheral portion of the sealing material is held at the tip of the receiving port by the sealing material holding cover, it is necessary to form a groove for accommodating the peripheral portion of the sealing material on the inner peripheral surface of the receiving port as in the prior art. There is no. For this reason, the maximum outer diameter dimension of the receiving port can be reduced by the amount that the groove is unnecessary.

According to the invention of claim 2, the fixing means is formed on the cylindrical portion of the sealing material holding cover, and is configured to be able to protrude radially inward with an elastic force from a position that does not hinder insertion of the receiving port; It is comprised from the to-be-engaged part formed in the outer peripheral surface of the said receiving port so that it can engage with the said latching claw.
For this reason, by inserting the receiving port to the predetermined position with respect to the cylindrical portion of the sealing material holding cover, the locking claw of the fixing means automatically engages the engaged portion, and the sealing material is held against the receiving port. The work efficiency of fixing the cover is improved.
According to the third aspect of the present invention, on the back side of the sealing material, a protrusion that can be brought into surface contact with the inner wall surface of the front end of the receiving port is formed at the boundary portion between the seal body and the peripheral edge.
For this reason, the sealing performance between the tip inner wall surface of the receiving port and the sealing material is improved by the protrusion. Further, when the seal body is pressed in the axial direction by the pipe inserted into the receptacle, the seal body turns in the depth direction of the receptacle on the tip side from the ridge. At this time, since the protrusion is in surface contact with the inner wall surface at the front end of the receiving port, it is difficult for the peripheral edge of the sealing material to receive a force that is drawn into the inner side of the receiving port.

According to invention of Claim 4, the convex part engaged with the front end surface of a receptacle in a radial direction is formed in the peripheral part of the sealing material.
For this reason, even if the peripheral part of the sealing material receives a force that is drawn into the inside of the receiving port, the peripheral part of the sealing material is held at the position of the front end surface of the receiving port by the function of the convex portion.
According to the invention of claim 5, the inner flange portion of the sealing material holding cover is formed with an inclined pressing surface for pressing the peripheral edge portion of the sealing material from the inside in the radial direction on the inner peripheral edge of the inner flange portion.
For this reason, even if the peripheral portion of the sealing material receives a force that is drawn into the inside of the receiving port, the peripheral portion of the sealing material is pressed against the inclined pressing surface of the inner flange portion of the sealing material holding cover, and the sealing material The peripheral edge is held at the position of the front end surface of the receptacle.

  According to invention of Claim 6, the expansion part formed between the straight pipe | tube part of a pipe main body and a receptacle, the fireproof outer pipe | tube covering the circumference | surroundings of the said straight pipe part, and the said expansion part were enclosed. In this state, it is constrained from the axial direction by the distal end surface of the outer tube, and is configured to be elastically deformable by relative displacement between the distal end surface of the outer tube and the expanded portion due to thermal expansion and contraction of the tube main body. A first elastic body, a cylindrical portion of the sealing material holding cover, a cylindrical portion covering the outer peripheral surface of the receptacle and the outer peripheral surface of the distal end of the outer tube, and the sealing material holding cover provided at the distal end of the cylindrical portion And a second elastic member sandwiched between the inner flange portion of the fireproof cover and the inner flange portion of the sealing material holding cover. And having a body.

According to the present invention, the relative displacement between the distal end surface of the outer tube and the expanded portion due to the thermal expansion and contraction of the tube main body is absorbed by elastic deformation of the first elastic body. Further, the relative displacement between the inner flange portion of the fireproof cover and the front end surface of the receiving port due to the thermal expansion and contraction of the tube main body is absorbed by the elastic deformation of the second elastic body. As described above, since the thermal expansion and contraction of the tube main body with respect to the outer tube and the fireproof cover can be absorbed by the first and second elastic bodies, the tube main body can be prevented from being damaged over time. Further, since an elastic body or the like is interposed between the outer pipe and the fireproof cover and the pipe body, the drain pipe does not play.
According to invention of Claim 7, the 1st elastic body is inserted in the wedge shape between the expansion part of the inner tube, and the cylinder part of the fireproof cover.
For this reason, the backlash between the receptacle and the fireproof cover can be efficiently prevented in a state where a gap-like space is held between the receptacle and the fireproof cover by the first elastic body.

  According to the present invention, since the holding force of the sealing material can be sufficiently secured, the sealing material is prevented from being removed from the receiving port, and the maximum outer diameter of the drain pipe can be reduced.

Hereinafter, the drain pipe according to the first embodiment of the present invention will be described with reference to FIGS. The drainage pipe according to the present embodiment is a drainage pipe used as a standing pipe of a drainage path in an apartment house such as a condominium, and FIG. 1 shows a broken longitudinal sectional view of a receiving portion of the drainage pipe. FIG. 2 is an enlarged view of FIG. FIG. 3 is a broken vertical sectional view showing a modified example of the drain pipe, and FIG. 4 is a longitudinal sectional view showing a modified example of the receiving part of the drain pipe.
The drain pipe 10 includes a pipe body 11 made of, for example, hard vinyl chloride. As shown in FIG. 1, the pipe body 11 is composed of a straight pipe portion 12 and a receiving port 13 formed at one end (the upper end in FIG. 1) of the straight pipe portion 12. A lower pipe of a joint (not shown) is connected. As shown in FIG. 1, between the straight pipe portion 12 and the receiving port 13 of the tube main body 11, a tapered expanding portion 13w that expands on the receiving port 13 side is formed. In addition, it is desirable for the expansion part 13w to have a gentle taper for reducing drainage resistance (for example, about 15 ° with respect to the axis).

A seal member 20 is attached to the tip (upper end) of the receiving port 13 to seal between the receiving port 13 and the lower pipe of the drainage pipe joint.
The seal material 20 is an elastic body (for example, rubber) formed in a ring shape, and includes a seal body 22 and a peripheral edge 24.
The seal body portion 22 is a portion that actually seals between the receiving port 13 and the lower pipe of the drainage pipe joint, and is formed in a state in which the longitudinal cross-sectional shape is substantially wedge-shaped and inclined to the back side of the receiving port 13. Yes. For this reason, when the lower pipe of the drainage pipe joint is inserted into the receiving port 13, the tip of the lower pipe comes into contact with the tip portion of the seal body 22. And the front-end | tip part of the seal | sticker main-body part 22 is pushed by the lower piping of a drainage pipe joint, expands, moving below, The lower-part piping is let through the seal | sticker main-body part 22. FIG. As a result, the seal body 22 seals between the lower pipe 62 and the receiving port 13.

As shown in FIG. 2, a ring-shaped flange 23 is formed on the surface side of the base end portion of the seal main body portion 22 so as to be substantially parallel to the distal end surface 13 f of the receiving port 13. The ring-shaped flange 23 is formed so as to be able to hold an adhesive inside, and is deformed by being pressed by the tip of the lower pipe when the lower pipe of the drain pipe joint is inserted into the receiving port 13. As a result, the adhesive inside the flange 23 is extruded onto the surface of the seal body 22 and the adhesive is filled between the seal body 22 and the lower pipe of the drainage pipe joint.
On the back surface side of the sealing material 20, a protrusion 22 r having a triangular cross section that can come into surface contact with the inner wall surface 13 e of the tip of the receiving port 13 is formed at a boundary portion between the seal main body portion 22 and the peripheral edge portion 24. As a result, the sealing performance between the tip inner wall surface 13e of the receiving port 13 and the sealing material 20 is improved. Further, when the seal main body portion 22 is pressed in the axial direction by the lower pipe of the drainage pipe joint, the seal main body portion 22 is rotated downward on the tip side from the protrusion 22r. At this time, since the protrusion 22r is in surface contact with the inner wall surface 13e of the tip of the receiving port 13, the peripheral edge 24 of the sealing material 20 to be described later is less likely to be pulled into the inside of the receiving port 13.

The peripheral edge 24 of the sealing material 20 is a part for holding the sealing material 20 at the tip of the receiving port 13, and is approximately the same as the pipe wall thickness of the receiving port 13 so that the tip surface 13 f of the receiving port 13 can be covered. It is formed in a ring shape with equal width dimensions. Here, the front end surface 13f of the receiving port 13 is composed of a flat portion perpendicular to the axis and an inclined surface portion 13k formed around the flat portion. Therefore, on the back side of the peripheral portion 24 of the sealing material 20, as shown in FIG. 2, a back plane 24d that can come into surface contact with the flat portion of the front end surface 13f of the receptacle 13, and an inclined surface portion 13k of the front end surface 13f. A convex inclined surface 24x capable of surface contact is formed. Therefore, even if a force in the direction in which the seal member 20 is pulled into the receiving port 13 (force on the inner side in the radial direction) is applied to the peripheral edge 24, the convex inclined surface 24 x of the peripheral edge 24 is the tip end surface 13 f of the receiving port 13. By engaging with the inclined surface portion 13k, movement of the peripheral edge portion 24 in the radial direction is restricted.
That is, the formation part of the convex inclined surface 24x of the peripheral part 24 is equivalent to the convex part of the peripheral part in this invention.

The front end surface (upper end surface) 24f of the peripheral edge 24 of the sealing material 20 is provided at a position protruding by a certain dimension in the axial direction from the position of the flange 23 of the seal main body 22, and the front end surface 24f and the seal main body are provided. A step 23 d is formed in a ring shape between the surface (tip surface) of the portion 22. Here, the position of the step 23d is set on an extension line of the outer peripheral surface 22s of the protrusion 22r of the seal main body 22 (the surface that is in surface contact with the inner wall surface 13e of the front end 13).
A corner portion between the front end surface 24f and the step 23d of the peripheral portion 24 is chamfered to form an inclined surface 24k, and the front end (inclined pressing surface) of the inner flange portion 34 of the sealing material holding cover 30 described later on the inclined surface 24k. 34k). Further, the corners of the outer peripheral surface 24z of the peripheral portion 24 and the tip surface 24f of the peripheral portion 24 are chamfered to form a curved surface 24t having an arcuate cross section.

The receiving port 13 is covered with a sealing material holding cover 30 in a state where the sealing material 20 is mounted.
The sealing material holding cover 30 is, for example, a steel plate cover for holding the sealing material 20 at the tip of the receiving port 13 by pressing the peripheral edge 24 of the sealing material 20, and as shown in FIG. The cylindrical section 32, the bent section 33, and the inner flange section 34 form a vertical cross-sectional shape in a substantially inverted L shape.
The cylindrical portion 32 of the sealing material holding cover 30 is a cylindrical body that covers from the outer peripheral surface 24z of the peripheral portion 24 of the sealing material 20 to the distal end outer peripheral surface 13r of the receiving port 13, and the inner diameter dimension of the cylindrical portion 32 is outside the receiving port 13. It is set almost equal to the diameter. A plurality of locking claws 36 for fixing the sealing material holding cover 30 to the receiving port 13 are formed in the cylindrical portion 32 in the circumferential direction. The locking claw 36 is formed so as to be oriented in the direction of the inner flange portion 34 in a state where the locking claw 36 protrudes inside the cylindrical portion 32 by cutting the wall portion of the cylindrical portion 32. It is held at that position by the elastic force of the claw 36 itself. On the other hand, a groove 13m having a square cross section that can engage with the engaging claw 36 of the cylindrical portion 32 of the sealing material holding cover 30 is formed in the circumferential direction on the outer peripheral surface 13r of the receiving end 13.

  When the receiving port 13 of the tube main body 11 is inserted into the cylindrical portion 32 of the sealing material holding cover 30, each of the locking claws 36 is pressed against the tip of the receiving port 13 so as to expand against the elastic force. become. At this time, since the inclined surface portion 13k is formed in the peripheral portion of the front end surface 13f of the receiving port 13, when the receiving port 13 is inserted into the cylindrical portion 32 of the sealing material holding cover 30, the front end surface 13f of the receiving port 13 is It becomes easy to pass the position of the locking claw 36 of the sealing material holding cover 30. In this way, each locking claw 36 is pressed against the tip of the receiving port 13 so as to expand against the elastic force, so that the receiving port 13 is inserted into the cylindrical portion 32 of the sealing material holding cover 30. It is not obstructed by the locking claw 36. Then, when the receiving port 13 is inserted to a predetermined position with respect to the cylindrical portion 32 of the sealing material holding cover 30 and the groove 13m on the outer peripheral surface 13r of the receiving port 13 reaches the position of the locking claw 36, the locking is performed. The claw 36 returns to its original position by elastic force and engages with the groove 13m. Accordingly, the sealing material holding cover 30 can be prevented from coming off from the receiving port 13. That is, the groove 13m corresponds to the engaged portion of the present invention.

The inner flange portion 34 of the sealing material holding cover 30 is provided at the tip of the cylindrical portion 32 via a bent portion 33 having an arcuate cross section. The inner flange portion 34 includes a flat plate portion 34f formed at right angles to the cylindrical portion 32 and an inclined pressing surface 34k formed at the tip (inner peripheral edge) of the flat plate portion 34f. In the state where the flat plate portion 34 f of the inner flange portion 34 is in surface contact with the distal end surface 24 f of the peripheral edge 24 of the sealing material 20, the inclined pressing surface 34 k of the inner flange portion 34 is the inclined surface of the peripheral edge 24 of the sealing material 20. It is configured to be multiplied by 24k.
Here, the engaging claw 36 of the sealing material holding cover 30 and the groove 13 m of the receiving port 13 are such that the gap between the inner flange portion 34 of the sealing material holding cover 30 and the front end surface 13 f of the receiving port 13 is the peripheral portion of the sealing material 20. The receptacle 13 is configured to be engaged when inserted into the cylindrical portion 32 of the sealing material holding cover 30 until the thickness becomes smaller than 24 (thickness before deformation).

For this reason, the peripheral edge 24 of the sealing material 20 is sandwiched between the inner flange portion 34 of the sealing material holding cover 30 and the front end surface 13f of the receiving port 13 with the sealing material holding cover 30 attached to the receiving port 13. It is held in that position in an elastically deformed state. Therefore, the clearance dimension between the inner flange portion 34 of the sealing material holding cover 30 and the front end surface 13f of the receiving port 13 when the engaging claw 36 of the sealing material holding cover 30 and the groove 13m of the receiving port 13 are engaged is adjusted. Thus, a sufficient holding force of the sealing material 20 can be secured.
In addition, it is also possible to adhere | attach the peripheral part 24 of the sealing material 20 on the front end surface 13f of the receptacle 13 with an adhesive agent.
Further, on the back side of the seal material 20, a protrusion 22 r is formed at the boundary portion between the seal main body portion 22 and the peripheral edge portion 24 so as to be in surface contact with the inner wall surface 13 e of the tip end of the receiving port 13. For this reason, when the seal body 22 is pressed in the axial direction by the lower pipe of the drainage pipe joint inserted into the receptacle 13, the seal body 22 rotates in the depth direction of the receptacle 13 on the tip side from the protrusion 22r. To move. At this time, since the protrusion 22r is in surface contact with the tip inner wall surface 13e of the receiving port 13, the peripheral edge 24 of the sealing material 20 is less likely to receive a force that is drawn into the receiving port 13. Furthermore, the sealing property between the tip inner wall surface 13e of the receiving port 13 and the sealing material 20 is improved by the protrusion 22r.

Further, a convex inclined surface 24x that engages with the inclined surface portion 13k of the front end surface 13f of the receiving port 13 in the radial direction is formed on the peripheral edge portion 24 of the sealing material 20. For this reason, even if the peripheral edge 24 of the sealing material 20 receives a force that is drawn into the inside of the receiving port 13, the peripheral edge 24 of the sealing material 20 is positioned at the front end surface 13 f of the receiving port 13 by the action of the convex inclined surface 24 x. Retained.
Further, the inner flange portion 34 of the sealing material holding cover 30 is formed with an inclined pressing surface 34k that presses the peripheral edge portion 24 of the sealing material 20 from the inside in the radial direction on the inner peripheral edge of the inner flange portion 34. For this reason, even if the peripheral edge 24 of the sealing material 20 receives a force that is drawn into the inside of the receiving port 13, the peripheral edge 24 of the sealing material 20 is inclined to the inclined pressing surface of the inner flange portion 34 of the sealing material holding cover 30. The peripheral edge 24 of the sealing material 20 is held at the position of the front end surface 13f of the receiving port 13 by being pressed by 34k.

With the configuration described above, even when the lower pipe of the drainage pipe joint is inserted into the receiving port 13, even if the lower pipe is caught by the sealing material 20, the sealing material 20 is difficult to come off from the receiving port 13.
Further, since the peripheral edge 24 of the sealing material 20 is held at the tip of the receiving port 13 by the sealing material holding cover 30, the peripheral edge 24 of the sealing material 20 is accommodated on the inner peripheral surface of the receiving port 13 as in the prior art. There is no need to form a groove for this purpose. For this reason, the maximum outer diameter of the receiving port 13 can be reduced by the amount that the groove is unnecessary.

In the present embodiment, an explanation has been given by taking an example of a normal drain pipe 10 that is not covered with a fireproof sound insulation cover or the like. However, as shown in FIG. 3, the drain pipe 10 is replaced with a fireproof sound insulation cylinder 40 or a fireproof sound insulation sheet. It is also possible to cover with 40 (hereinafter referred to as a fireproof sound insulation cylinder 40). Here, the fireproof sound insulation cylinder 40 includes an inner sound absorption layer 42 and an outer sound insulation layer 44.
The sound absorbing layer 42 is a layer for absorbing the sound of drainage flowing through the tube main body 11 and the vibration of the tube main body 11, and is composed of noncombustible inorganic fibers such as glass wool felt. The sound insulation layer 44 is a layer for reflecting the sound of drainage so as not to leak to the outside. The sound insulation layer 44 has fire resistance and air tightness, and is made of a material having a large specific gravity, for example, polymer or rubber on asphalt. It consists of added modified asphalt and nonwoven fabric.
As shown in FIG. 3, the pipe body 11 has a straight pipe portion 12 passed through a fire and sound insulation cylinder 40, and the receiving port 13 and the expanded portion 13w are covered with a fire and sound insulation sheet 40 cut into a predetermined shape. ing. And the joint part of the fireproof sound insulation sheet 40 and the connection part of the fireproof sound insulation sheet 40 and the fireproof sound insulation cylinder 40 are bonded together by the joint tape 46 of a material substantially the same as the sound insulation layer 44.
As a result, the fireproof performance and sound insulation performance of the drain pipe 10 can be improved.

In addition, as shown in FIG. 4, the drain pipe 10 can be covered with an outer pipe 62 and a fireproof cover 64 made of fiber reinforced mortar (a mortar mixed with non-combustible material and fibers). Here, the outer tube 62 is configured in a straight tube shape so as to cover the periphery of the straight tube portion 12 of the tube body 11. The fireproof cover 64 is a cover that covers from the sealing material holding cover 30 to the outer peripheral surface of the receiving port 13, and further to the widened portion 13w and the distal end portion of the outer tube 62, and is vertically cut by the cylindrical portion 64e and the inner flange portion 64f. The surface shape is formed in a substantially inverted L shape. The cylindrical portion 64e of the fireproof cover 64 is fixed to the distal end portion of the outer tube 62 by a plurality of tapping pins 64t and a fireproof joint material 69 which is a mortar adhesive.
Around the expanded portion 13w of the tube body 11, a ring-shaped wedge-shaped elastic body 66 is located inside the cylindrical portion 64e of the fireproof cover 64 and at a position constrained from the axial direction by the distal end surface 62f of the outer tube 62. It is set.

The wedge-shaped elastic body 66 is a member for absorbing the amount of displacement in the axial direction of the expanded portion 13w of the tube body 11 with respect to the distal end surface 62f of the outer tube 62 caused by the thermal expansion and contraction of the tube body 11, and is made of rubber, for example. Is formed. Since the wedge-shaped elastic body 66 is inserted between the widened portion 13w of the tube main body 11 and the cylindrical portion 64e of the fireproof cover 64, the wedge-shaped elastic body 66 uses the wedge-shaped elastic body 66 to connect the receiving port 13 of the tube main body 11 and the fireproof cover. The gap S can be formed in a state where there is no backlash with respect to 64. The clearance S makes it difficult for the heat of the fireproof cover 30 to be transmitted to the receiving port 13 and also prevents vibration from being transmitted from the drain pipe 10 to the concrete slab or the like.
In addition, a ring-shaped rectangular elastic body 68 is sandwiched between the inner flange portion 34 of the sealing material holding cover 30 and the inner flange portion 64 f of the fireproof cover 64. As a result, the relative displacement between the inner flange portion 64 f of the fireproof cover 64 and the inner flange portion 34 of the sealing material holding cover 30 due to the thermal expansion and contraction of the tube main body 11 can be absorbed by the square elastic body 68.
That is, the wedge-shaped elastic body 66 corresponds to the first elastic body of the present invention, and the square elastic body 68 corresponds to the second elastic body of the present invention.

In the present embodiment, an example in which the sealing material holding cover 30 is put on the receiving port 13 in a state where the sealing material 20 is attached to the tip of the receiving port 13 is shown. However, the sealing material 20 is previously placed on the inner surface of the sealing material holding cover 30. It is also possible to bond them.
Moreover, in this embodiment, although the latching claw 36 of the sealing material holding cover 30 was engaged with the groove 13m on the outer peripheral surface of the receiving port 13, the sealing material holding cover 30 was fixed to the receiving port 13 by way of example. For example, the sealing material holding cover 30 can be fixed to the receiving port 13 with a tapping pin or the like.
Moreover, although the example which forms the latching nail | claw 36 by notching the cylindrical part 32 of the sealing material holding cover 30 was shown, as shown to FIG. It is also possible to form a convex portion and use the convex portion as a locking claw. Furthermore, although the example (square groove) which formed the groove | channel 13m in a cross-sectional square shape was shown, the triangular groove | channel of a cross-sectional triangle corresponding to the circular groove | channel of a cross-section arc shape corresponding to a spherical convex part, or a nail | claw-shaped convex part. It is also possible.
Moreover, although the example which applies the drain pipe 10 of this invention to a standing pipe was shown in this embodiment, it is also possible to apply this invention to a side branch pipe, a pipe joint, etc.

It is a fracture | rupture longitudinal cross-sectional view of the receptacle part of the drain pipe which concerns on Embodiment 1 of this invention. It is the longitudinal cross-sectional view (B figure, C figure) showing the example of a change of II claw enlarged view (A figure) of FIG. 1, and a latching claw. It is a partially broken longitudinal cross-sectional view showing the example of a change of a drain pipe. It is a longitudinal cross-sectional view of the receptacle part showing the example of a change of a drain pipe. It is the external view and longitudinal cross-sectional view of the conventional fireproof two-layer pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drain pipe 11 Pipe main body 12 Straight pipe part 13 Receiving port 13m Groove (engaged part, fixing means)
20 sealing material 22 seal main body 22r ridge 24 peripheral edge 24x convex inclined surface (convex)
30 Sealing material holding cover 32 Cylindrical portion 34 Inner flange portion 36 Locking claw (fixing means)
40 Fireproof soundproof cylinder 42 Sound absorbing layer 44 Sound insulating layer 62 Outer pipe 64 Fireproof cover 66 Wedge-shaped elastic body (first elastic body)
68 Square elastic body (second elastic body)

Claims (7)

A pipe connection receptacle formed at the end of the pipe body, a member that seals between the pipe inserted into the receptacle and the receptacle, and is composed of a seal body portion and a peripheral portion, A seal member whose peripheral portion covers the tip end surface of the receptacle, a cylindrical portion covering the outer peripheral surface of the receptacle, and an inner flange portion formed at the tip of the cylindrical portion, and the inner flange portion of the seal member A drain pipe having a sealing material holding cover that holds the sealing material at the tip of the receptacle by pressing the peripheral edge,
The receiving port is inserted into the cylindrical portion of the sealing material holding cover, and the peripheral portion of the sealing material is sandwiched between the inner flange portion of the sealing material holding cover and the front end surface of the receiving port, and is elastically deformed. In the state, the drain pipe characterized by that the sealing material holding cover is fixed to the outer peripheral surface of the receptacle by a fixing means. A drain pipe according to claim 1, wherein
The fixing means is
A locking claw formed on the cylindrical portion of the sealing material holding cover and configured to protrude radially inward with an elastic force from a position that does not hinder insertion of the receiving port;
An engaged portion formed on the outer peripheral surface of the receptacle so as to be engageable with the locking claw;
A drainage pipe characterized by having. A drain pipe according to claim 1 or claim 2,
A drainage pipe characterized in that, on the back side of the seal material, a protrusion is formed at the boundary portion between the seal body and the peripheral edge so as to be in surface contact with the inner wall surface of the tip of the receiving port. A drain pipe according to any one of claims 1 to 3,
A drainage pipe characterized in that a convex portion that engages with a distal end surface of a receiving port in a radial direction is formed on a peripheral portion of the sealing material. A drain pipe according to any one of claims 1 to 4,
A drainage pipe characterized in that an inclined pressing surface for pressing the peripheral edge of the sealing material from the inner side in the radial direction is formed on the inner peripheral edge of the inner flange of the inner flange of the sealing material holding cover. A drain pipe according to any one of claims 1 to 5,
An expanded portion formed between the straight tube portion of the tube body and the receiving port;
A fire-resistant outer tube covering the periphery of the straight pipe part;
In a state of surrounding the expanding portion, the outer tube is restrained in the axial direction by the distal end surface, and due to the relative displacement between the distal end surface of the outer tube and the expanding portion due to thermal expansion and contraction of the tube body. A first elastic body configured to be elastically deformable;
A cylindrical portion of the sealing material holding cover, a cylindrical portion covering the outer peripheral surface of the receiving port and the outer peripheral surface of the outer tube, and an inner cover provided at the distal end of the cylindrical portion to cover the inner flange portion of the sealing material holding cover A fireproof cover comprising a buttock and formed of a fireproof material;
A second elastic body sandwiched between an inner flange portion of the fireproof cover and an inner flange portion of the sealing material holding cover;
A drainage pipe characterized by comprising: A drain pipe according to claim 6,
The drainage pipe, wherein the first elastic body is inserted in a wedge shape between the expanded portion of the inner tube and the cylindrical portion of the fireproof cover.

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