JP2005282750A - Fire resistant double layered pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire resistant double layered pipe whose gap is prevented by absorbing the thermal expansion/contraction of an inner pipe against an outer pipe and a fire resistant cover. <P>SOLUTION: The fire resistant double layered pipe is constrained in the axial direction by a front end face 42f of the outer pipe 42 in the state of encircling a unfold portion 13w of the inner pipe 11. It comprises an elastic body 50 formed elastically deformable with relative displacement between the front end face 42f of the outer pipe 42 and the unfold portion 13w of the inner pipe 11 resulting from the thermal expansion/contraction of the inner pipe 11, a seal material 20 consisting of a seal body 22 and an peripheral edge portion 24 for covering a front end portion 13f of a socket 13 at the peripheral edge portion 24, and the fire resistant cover 30 having a cylinder portion 32 for covering a range from an outer peripheral face 13r of the socket 13 to the front end outer peripheral face of the outer pipe 42 and an inner collar portion 34 provided at the front end of the cylinder portion 32 for covering the peripheral edge portion 24 of the seal material 20. The peripheral edge portion 24 of the seal material 20 is formed elastically deformable with relative displacement between the inner collar portion 34 of the fire resistant cover 30 and the front end face 13f of the socket 13 resulting from the thermal expansion/contraction of the inner pipe 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fire-resistant double-layer pipe used as a standing pipe of a drainage path in an apartment house such as an apartment, that is, an inner pipe provided with a receiving port for pipe connection at an end, and an outer pipe covering the periphery of the inner pipe And a fireproof double-layer pipe.

A related art fireproof double-layer tube is described in Patent Document 1.
As shown in FIG. 7, the fireproof double-layer pipe 90 includes an inner pipe 91 made of resin, and a lower straight pipe portion (not shown) of a drainage pipe joint is inserted into the upper part of the inner pipe 91. A receiving port 91w is formed. An inner peripheral groove 91m is formed in the vicinity of the tip (upper end) of the receiving port 91w, and a ring-shaped sealing material 94 is engaged and held in the inner peripheral groove 91m. Since the outer peripheral surface of the receiving port 91w is enlarged by the amount corresponding to the recess of the inner peripheral groove 91m, the outer diameter dimension is maximized at the position of the inner peripheral groove 91m. The circumference of the straight pipe portion of the inner pipe 91 and the receiving port 91w is covered with an outer pipe 92 formed of mortar mixed with refractory fibers.

JP 2001-187985

  Since the inner pipe 91 of the fireproof double-layer pipe 90 is made of resin, the linear expansion coefficient is large. On the other hand, since the outer tube 92 covering the inner tube 91 is formed of mortar mixed with refractory fibers, the linear expansion coefficient is smaller than that of the inner tube 91. Therefore, when the inner tube 91 is thermally expanded in the axial direction with respect to the outer tube 92, the upward stepped portion d3 provided on the outer peripheral surface of the receiving port 91w presses the downward stepped portion n3 of the inner peripheral surface of the outer tube 92 from below. At the same time, the lower downward step portion d1 provided on the outer peripheral surface of the receiving port 91w presses the lower upward step portion n1 of the inner peripheral surface of the outer tube 92 from above. Further, when the inner tube 91 is thermally contracted with respect to the outer tube 92, the upper downward step portion d2 provided on the outer peripheral surface of the receiving port 91w presses the upper upward step portion n2 of the inner peripheral surface of the outer tube 92 from above. become. As a result, the outer tube 92 may crack over time or the receiving port 91w may be deformed.

In order to solve the above problems, both step portions d1 to d3 and n1 are arranged so that the step portions d1 to d3 on the outer peripheral surface of the inner tube 91 and the step portions n1 to n3 on the inner peripheral surface of the outer tube 93 do not contact each other. It is also conceivable to provide a space between. However, if a space is provided, there is a concern about noise due to backlash of the fireproof double-layer tube 90.
The present invention has been made to solve the above-mentioned problems, and a technical problem of the present invention is that it can absorb a difference in expansion and contraction between the inner tube and the outer tube due to a temperature change, and is also refractory. This is to prevent backlash from occurring in the layer tube.

The above-described problems are solved by the inventions of the claims.
The invention of claim 1 includes a pipe main body part, a pipe connection receiving port formed at an end of the pipe main body part, and an expansion part provided between the pipe main body part and the receiving port. The inner tube, a fire-resistant outer tube covering the periphery of the tube main body portion of the inner tube, and in a state of surrounding the expanded portion of the inner tube, is restrained from the axial direction by the tip surface of the outer tube, An elastic body configured to be elastically deformable by relative displacement between the distal end surface of the outer tube and the expanded portion of the inner tube caused by thermal expansion and contraction of the inner tube; A seal member that covers the distal end surface of the receiving port at the peripheral edge portion, a cylindrical portion that covers from the outer peripheral surface of the receiving port to the outer peripheral surface of the outer tube, and provided at the distal end of the cylindrical portion. And an inner collar portion covering a peripheral edge portion of the sealing material that covers the front end surface of the receiving port, and is formed of a refractory material. A peripheral portion of the sealing material that can be elastically deformed by relative displacement between an inner flange portion of the fireproof cover and a front end surface of the receiving port due to thermal expansion and contraction of the inner tube. It is configured.

According to the present invention, the relative displacement between the distal end surface of the outer tube and the expanded portion of the inner tube due to the thermal expansion and contraction of the inner tube is absorbed by elastic deformation of the elastic body. For this reason, even if the inner tube is thermally shrunk, the heat shrinkage is absorbed by the elastic body, and there is no problem that the expanded portion of the inner tube comes into contact with the distal end surface of the outer tube. Furthermore, even if the inner tube is thermally expanded, there is no gap between the elastic body and the distal end surface of the outer tube and between the elastic body and the expanded portion of the inner tube.
In addition, the relative displacement between the inner flange portion of the fireproof cover and the front end surface of the receiving end of the inner tube due to the thermal expansion and contraction of the inner tube is absorbed by elastic deformation of the peripheral portion of the sealing material. For this reason, even if the inner tube is thermally contracted, no gap is generated between the peripheral edge of the sealing material and the inner flange of the fireproof cover and between the peripheral edge of the sealing material and the front end surface of the receiving port. Furthermore, even if the inner tube is thermally expanded, the thermal expansion is absorbed by the peripheral portion of the sealing material, and there is no problem that the front end surface of the receiving port comes into contact with the inner flange portion of the fireproof cover.
Thus, the thermal expansion and contraction of the inner tube with respect to the outer tube and the fireproof cover can be absorbed by the peripheral portion of the elastic body and the sealing material, so that the inner tube and the outer tube can be prevented from being damaged over time. Furthermore, since an elastic body or the like is interposed between the outer tube and the fireproof cover and the inner tube, no play is generated in the fireproof two-layer tube.

  According to invention of Claim 2, the 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, it is possible to efficiently prevent backlash between the inner tube and the fireproof cover in a state where a gap-like space is held between the receptacle of the inner tube and the fireproof cover by the elastic body.

According to the invention of claim 3, the elastic body is formed in a ring shape, and has an inner inclined surface that makes surface contact with the expanded portion of the inner tube and a base end surface that makes surface contact with the distal end surface of the outer tube. An inner groove is formed in the circumferential direction so as to cut out the corner portion at the corner portion between the inner inclined surface and the base end surface.
That is, the relative displacement between the distal end surface of the outer tube and the expanded portion of the inner tube due to the thermal expansion and contraction of the inner tube is absorbed by the elastic deformation of the elastic body and the space formed by the inner groove of the elastic body. Is done. For this reason, compared with the case where a space is not provided, the amount of absorption of thermal expansion and contraction of the inner tube can be increased.

  According to the invention of claim 4, the elastic body has an outer inclined surface in surface contact with the cylindrical portion of the fireproof cover, and a corner portion between the outer inclined surface and a base end surface in surface contact with the distal end surface of the outer tube. An outer groove is formed in the circumferential direction so as to cut out the corner portion at the position. Thus, since the outer groove is formed in accordance with the inner groove of the elastic body, the elastic body can be deformed in a balanced manner inward and outward in the radial direction.

According to the fifth aspect of the present invention, a wedge-shaped portion is formed at the outer peripheral end of the peripheral portion of the sealing material so as to be inserted into the gap between the receiving port of the inner tube and the cylindrical portion of the fireproof cover. For this reason, the backlash between the inner pipe and the fireproof cover can be efficiently prevented in a state where a gap-like space is held between the receptacle of the inner pipe and the fireproof cover together with the elastic body.
Further, as shown in claim 6, it is preferable from the viewpoint of preventing backlash that the cylindrical portion of the fireproof cover is fixed to the outer tube by the fixing member. Here, the fixing member includes not only a screw member such as a tapping pin but also a fireproof joint material which is a mortar adhesive.
According to the invention of claim 7, the outer tube and the inner tube can protrude from the lower surface of the concrete slab in a state where the upper surface of the fireproof cover is substantially aligned with the upper surface of the concrete slab separating the upper and lower floors of the apartment house. As such, dimensions in the axial direction of the inner tube, the outer tube, and the fireproof cover are set. That is, by using this refractory double-layer pipe, pipe connection in the concrete slab can be prevented.
According to invention of Claim 8, the peripheral part of a sealing material is comprised so that thickness increase is possible. For this reason, it becomes possible to flexibly cope with the thermal expansion and contraction of the inner tube relative to the outer tube and the like. As a method of increasing the thickness, a plate piece made of the same material as or different from the sealing material may be bonded, or heat fusion may be performed.

  According to the present invention, since the thermal expansion and contraction of the inner tube relative to the outer tube and the fireproof cover can be absorbed by the peripheral portion of the elastic body and the sealing material, the inner tube and the outer tube can be prevented from being damaged over time. Further, since an elastic body or the like is interposed between the outer tube and the fireproof cover and the inner tube, no play is generated in the fireproof two-layer tube.

(Embodiment 1)
Hereinafter, based on FIGS. 1-6, the fireproof two-layer pipe | tube which concerns on Embodiment 1 of this invention is demonstrated. The fireproof double-layer pipe according to the present embodiment is a double-layer pipe used as a standing pipe for a drainage path in an apartment house such as an apartment, and FIG. 1 shows a longitudinal sectional view of a receiving part of the fireproof double-layer pipe. Yes. 2 and 3 are a cross-sectional view of a sealing material and a cross-sectional view of an elastic body used in a fireproof double-layer tube. 4 is a schematic side view showing a construction example of a fireproof double-layer pipe, FIG. 5 is a longitudinal sectional view showing a modification example of the fireproof double-layer pipe, and FIG. 6 is a longitudinal sectional view showing a modification example of the elastic body.

The fireproof two-layer pipe 10 (hereinafter referred to as the stand pipe 10) includes an inner pipe 11 made of, for example, hard vinyl chloride. As shown in FIG. 1, the inner pipe 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. The lower straight pipe part 60 (refer to a two-dot chain line) of the pipe joint is connected. Between the straight tube portion 12 of the inner tube 11 and the receiving port 13, a tapered expanding portion 13 w 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 straight pipe portion 60 of the drainage pipe joint.

As shown in FIGS. 1 and 2, the seal material 20 is formed in a ring shape from an elastic material (for example, rubber), and includes a seal body portion 22 and a peripheral edge portion 24.
The seal body portion 22 is a portion that actually seals between the receiving port 13 and the lower straight pipe portion 60 of the drainage pipe joint. In a state where the vertical cross-sectional shape is substantially wedge-shaped and inclined toward the back side of the receiving port 13. Is formed. For this reason, when the lower straight pipe portion 60 of the drainage pipe joint is inserted into the receiving port 13, the tip of the lower straight pipe portion 60 comes into contact with the tip portion of the seal main body portion 22. When the lower straight pipe portion 60 of the drainage pipe joint is pushed into the receiving port 13, it is pushed by the lower straight pipe portion 60 and the tip end portion of the seal main body portion 22 expands while moving downward. The pipe part 60 is passed through the seal body part 22. As a result, the space between the lower straight pipe portion 60 and the receiving port 13 is sealed by the seal main body portion 22.
Further, a groove 23 for holding the adhesive is formed on the surface side of the base end portion of the seal body 22. For this reason, the sealing property of the said lower straight pipe | tube part 60 and the receptacle 13 can be improved using an adhesive material.

The peripheral portion 24 of the sealing material 20 is a portion for holding the sealing material 20 at the tip of the receiving port 13, and is formed on a ring portion 24r that covers the tip surface 13f of the receiving port 13 and an outer peripheral edge of the ring-shaped portion 24r. And a wedge-shaped portion 24k.
The thickness dimension of the ring portion 24r of the peripheral edge portion 24 can absorb the displacement of the distal end surface 13f of the receiving port 13 with respect to the inner flange portion 34 (described later) of the fireproof cover 30 due to thermal expansion and contraction of the inner tube 11 by elastic deformation. Set to dimensions. That is, as shown in FIG. 2 (A), a thickened portion (dimension Z0) is provided above the groove 23 for holding the adhesive, and the thickened portion works to increase the tip surface 13f of the receiving port 13. Displacement can be absorbed. In accordance with the design conditions, as shown in FIG. 2B, it is possible to further increase the thickness (dimension Z1) in the increased thickness portion. Here, as a method of increasing the thickness, a plate piece made of the same material as or different from the sealing material may be adhered, or heat fusion may be performed.
The wedge-shaped portion 24k of the peripheral edge 24 of the sealing material 20 covers the chamfered portion 13x of the front end surface 13f of the receiving port 13, and is inserted into a gap-like space S between the receiving port 13 and a cylindrical portion 32 of a fireproof cover 30 (described later). The cross section is formed in a substantially wedge shape (triangular cross section) as possible. Further, the outer peripheral upper corner portion 24e of the peripheral edge portion 24 of the sealing material 20 is chamfered in a circular arc shape in cross section.

The receiving port 13 is covered with a fireproof cover 30 in a state where the sealing material 20 is mounted.
The fireproof cover 30 is a cover that protects from the front end surface 13f of the receiving port 13 to the outer peripheral surface 13r, the expanded portion 13w of the inner tube 11, and the upper end portion of the straight tube portion 12 from the flame. As shown in FIG. The vertical cross-sectional shape is formed in a substantially inverted L shape by the portion 32 and the inner flange portion 34.
The fireproof cover 30 is formed, for example, by pouring mortar (fiber reinforced mortar) mixed with non-combustible material and fibers into a mold. At this time, for example, if the wire formed in a net shape is embedded in the connecting portion between the cylindrical portion 32 and the inner collar portion 34, the strength of the inner collar portion 34 can be improved. In addition, it is desirable that the fiber reinforced mortar is a compound that does not easily transmit smoke and is difficult to break. Further, the outer peripheral corners of the cylindrical portion 32 and the inner flange portion 34 of the fireproof cover 30 are chamfered in a circular arc shape in cross section. This makes it difficult for the fireproof cover 30 to be damaged. Moreover, the thickness dimension of the fireproof cover 30 is set to a value substantially equal to the thickness dimension of the outer cylinder 42 described later.

The inner diameter dimension of the cylindrical portion 32 of the fireproof cover 30 is set to a value substantially equal to the outer diameter dimension of the peripheral edge portion 24 of the sealing material 20. Further, the length dimension of the cylindrical portion 32 of the fireproof cover 30 is set to a value that can cover from the receiving port 13 of the inner tube 11 to the upper end portion of the straight tube portion 12.
Further, the width dimension of the inner flange portion 34 of the fireproof cover 30 is set to a value substantially equal to the width dimension of the peripheral edge portion 24 of the sealing material 20. For this reason, the peripheral edge 23 of the sealing material 20 is covered with the inner flange 34 of the fireproof cover 30 in a state where the fireproof cover 30 is covered with the receptacle 13, and the peripheral edge 23 is connected to the front end surface 13 f of the receptacle 13. It is clamped between the inner flange 34 of the fireproof cover 30. Accordingly, when the lower straight pipe portion 60 of the drainage pipe joint is inserted into the receiving port 13, the sealing material 20 is not easily detached from the receiving port 13.

The periphery of the straight pipe portion 12 of the inner pipe 11 is covered with a straight tubular outer pipe 42 formed of the same material (fiber reinforced mortar) as the fireproof cover 30. Strictly speaking, the straight tube portion 12 of the inner tube 11 is exposed without being covered with the outer tube 42 in a range of about 5 mm from the boundary portion K (bending point K) with the expanded portion 13w. And the straight pipe | tube part 12 of the exposed inner pipe | tube 11 becomes the expansion-contraction absorption part RK.
The outer tube 42 has an outer diameter dimension set to a value slightly smaller than the inner diameter dimension of the cylindrical portion 32 of the fireproof cover 30 so that the distal end portion can be inserted into the cylindrical portion 32 of the fireproof cover 30. In addition, the thickness dimension of the outer tube 42 is set to a value substantially equal to the thickness dimension of the fireproof cover 30 as described above.
That is, the straight pipe portion 12 of the inner pipe 11 corresponds to the pipe main body portion of the present invention.

Around the expanded portion 13w of the inner tube 11, a ring-shaped elastic body 50 is set inside the cylindrical portion 32 of the fireproof cover and at a position constrained from the axial direction by the distal end surface 42f of the outer tube 42. ing.
The elastic body 50 is a member for absorbing the amount of displacement in the axial direction of the expanded portion 13w of the inner tube 11 with respect to the distal end surface 42f of the outer tube 42 due to the thermal expansion and contraction of the inner tube 11, for example, a ring made of rubber. It is formed in a shape. As shown in FIGS. 1 and 3, the elastic body 50 includes a thick portion 50a having a substantially wedge-shaped cross section, and a plate-like thin portion 50b provided coaxially below the thick portion 50a. An inner step 55 and an outer step 56 are formed at the boundary between the thick portion 50a and the thin portion 50b.

The thick portion 50 a of the elastic body 50 includes an inner inclined surface 52 and an outer inclined surface 54, and the inner inclined surface 52 is configured to be able to come into surface contact with the expanded portion 13 w of the inner tube 11. Further, the outer inclined surface 54 of the thick portion 50 a is configured to be able to come into surface contact with the cylindrical portion 32 of the fireproof cover 30. Further, the distal end portion 53 of the thick portion 50a is chamfered in a substantially arc shape so that a slight gap is formed between the expanded portion 13w of the inner tube 11 and the cylindrical portion 32 of the fireproof cover 30. Has been.
A base end surface 57 is formed at the lower end of the thin portion 50 b of the elastic body 50 in parallel with the inner step 55 and the outer step 56, and the base end surface 57 is configured to come into surface contact with the front end surface 42 f of the outer tube 42. ing.
That is, an inner groove 55m is formed between the inner inclined surface 52 and the base end surface 57 of the elastic body 50 in the circumferential direction so as to cut out the inner inclined surface 52, the base end surface 57, and the corners. An outer groove 56m is formed in the circumferential direction between the outer inclined surface 54 and the base end surface 57 of the elastic body 50 so as to cut out the outer inclined surface 54, the base end surface 57 and the corner.

Next, a procedure for forming the standpipe 10 will be briefly described.
First, the peripheral edge 24 of the sealing material 20 is put on the tip surface 13f and the chamfered portion 13x of the receiving port 13 of the inner tube 11 in a state where the adhesive is applied to the inside of the peripheral edge 24 of the sealing material 20.
Next, the receiving port 13 of the inner tube 11 is pushed into the cylindrical portion 32 of the fireproof cover 30 with the lubricant applied to the peripheral edge portion 24 of the sealing material 20. As described above, the outer peripheral upper corner 24e of the peripheral edge 24 of the sealing material 20 is chamfered in a circular arc shape, and the lubricant 13 is further applied so that the receiving port 13 of the inner tube 11 becomes the cylinder of the fireproof cover 30. The fireproof cover 30 is easily assembled by being pushed into the portion 32 smoothly. At this time, the wedge-shaped portion 24k of the peripheral edge 24 of the seal member 20 is pushed between the outer peripheral surface 13r of the receiving port 13 and the inner wall surface of the cylindrical portion 32 of the fireproof cover 30, so that the receiving port 13 and the cylindrical portion 32 of the fireproof cover 30 are provided. A gap-shaped space S is formed between the two.
Thus, when the fireproof cover 30 is put on the receiving port 13 of the inner pipe 11, next, the ring-shaped elastic body 50 is placed in the gap between the expanded portion 13 w of the inner pipe 11 and the cylindrical portion 32 of the fireproof cover 30. Is pushed into a wedge shape with the thick portion 50a first.

That is, in the elastic body 50, the inner inclined surface 52 of the thick portion 50a comes into surface contact with the expanded portion 13w of the inner tube 11, and the outer inclined surface 54 of the thick portion 50a faces the cylindrical portion 32 of the fireproof cover 30. Come into contact.
Next, the periphery of the straight tube portion 12 of the inner tube 11 is covered by the outer tube 42, and the upper end portion of the outer tube 42 is in contact with the distal end surface 42 f of the outer tube 42 in contact with the base end surface 57 of the elastic body 50. Is inserted into the cylindrical portion 32 of the fireproof cover 30. In this state, the distal end surface 42f of the outer tube 42 is positioned at a position about 5 mm away from the bending point K of the inner tube 11 in the axial direction. Furthermore, a ring-shaped space Sr is formed around the bending point K of the inner tube 11 by the inner groove 55m of the elastic body 50. Further, a ring-shaped space Su is formed between the cylindrical portion 32 of the fireproof cover 30 and the elastic body 50 by the outer groove 56 m of the elastic body 50.

Next, the inner tube 11 and the outer tube 42 are slightly pushed into the inside of the fireproof cover 30 by a dedicated jig (not shown), and the elastic body 50 and the peripheral portion 24 of the sealing material 20 receive a pressing force from the axial direction. The cylindrical portion 32 of the fireproof cover 30 is fixed to the outer tube 42 with a tapping pin 32t. The fixing with the tapping pin 32t is preferably performed at 3 to 4 points in the circumferential direction. Next, the lower end surface 32d of the cylindrical portion 32 of the fireproof cover 30 is fixed to the outer peripheral surface of the outer tube 42 by a fireproof joint material 59 that is, for example, a mortar adhesive. In other words, the gap formed between the fireproof cover 30 and the outer tube 42 is filled with the fireproof joint material 59. In this state, the standpipe 10 is completed.
Here, before connecting the lower straight pipe portion 60 of the drainage pipe joint to the receiving port 13 of the vertical pipe 10, as shown in FIG. 1, a ring-shaped smoke leakage prevention member is formed on the upper surface of the inner flange portion 34 of the fireproof cover 30. It is preferable to set 58. As the material of the smoke leakage prevention member 58, a material having fire resistance, non-breathability and elasticity is used. Here, the non-breathable material includes not only a material that does not allow gas to pass through at all, but also a material that is difficult for gas to pass through and that can substantially prevent leakage of smoke.

Next, the relationship between the inner tube 11, the outer tube 42, and the fireproof cover 30 when the inner tube 11 of the standing tube 10 is thermally expanded and contracted will be described.
When the inner tube 11 is thermally expanded, the inner tube 11 is displaced upward with respect to the outer tube 42 and the fireproof cover 30 (see the black arrow in FIG. 1). As a result, the expanded portion 13 w of the inner tube 11 is separated from the distal end surface 42 f of the outer tube 42, and the distal end surface 13 f of the receiving port 13 of the inner tube 11 approaches the inner flange portion 34 of the fireproof cover 30. As a result, the elastic body 50 is elastically deformed in a direction extending in the axial direction between the expanded portion 13w of the inner tube 11 and the distal end surface 42f of the outer tube 42. Therefore, there is no gap between the elastic body 50 and the distal end surface of the outer tube 42 and between the elastic body 50 and the expanded portion 13 w of the inner tube 11.
Further, the peripheral edge portion 24 of the sealing material 20 is sandwiched between the front end surface 13f of the receiving port 13 and the inner flange portion 34 of the fireproof cover 30, and is elastically deformed in a contracting direction. That is, even if the inner tube 11 is thermally expanded, the thermal expansion is absorbed by the peripheral edge 24 of the sealing material 20, and the tip surface 13 f of the receiving port 13 comes into contact with the inner flange portion 34 of the fireproof cover 30. Absent.
Thus, since the thermal expansion of the inner tube 11 with respect to the outer tube 42 and the fireproof cover 30 can be absorbed by the peripheral edge 24 and the elastic body 50 of the sealing material 20, deformation of the inner tube 11, damage to the outer tube 42, and the like can be prevented. . Furthermore, since no gap is generated between the elastic body 50 and the distal end surface of the outer tube 42 and between the elastic body 50 and the expanded portion 13w of the inner tube 11, no play is generated in the vertical tube 10.

When the inner tube 11 is thermally contracted, the inner tube 11 is displaced downward with respect to the outer tube 42 and the fireproof cover 30 (see white arrows in FIG. 1). As a result, the expanded portion 13 w of the inner tube 11 approaches the distal end surface 42 f of the outer tube 42, and the distal end surface 13 f of the receiving port 13 of the inner tube 11 is separated from the inner flange portion 34 of the fireproof cover 30. As a result, the elastic body 50 is elastically deformed in the direction of contracting in the axial direction between the expanded portion 13w of the inner tube 11 and the distal end surface 42f of the outer tube 42. That is, even if the inner tube 11 is thermally shrunk, the heat shrinkage is absorbed by the elastic body 50, and there is no problem that the expanded portion 13 w of the inner tube 11 abuts on the tip surface 42 f of the outer tube 42.
Further, the peripheral edge portion 24 of the sealing material 20 is elastically deformed in a direction extending in the axial direction between the front end surface 13 f of the receiving port 13 and the inner flange portion 34 of the fireproof cover 30. That is, even if the inner tube 11 is thermally contracted, there is no problem that a gap is generated between the peripheral edge 24 of the sealing material 20, the front end surface 13 f of the receiving port 13, and the inner flange portion 34 of the fireproof cover 30.
Thus, since the thermal contraction of the inner tube 11 with respect to the outer tube 42 and the fireproof cover 30 can be absorbed by the peripheral edge 24 and the elastic body 50 of the sealing material 20, damage to the inner tube 11 and the outer tube 42 can be prevented. Furthermore, since no gap is generated between the peripheral edge 24 of the sealing material 20, the front end surface 13 f of the receiving port 13 and the inner flange portion 34 of the fireproof cover 30, no backlash occurs in the standpipe 10.

In addition, since the elastic body 50 is inserted in a wedge shape between the expanded portion 13w of the inner tube 11 and the cylindrical portion 32 of the fireproof cover 30, the elastic body 50 causes the receiving port 13 of the inner tube 11 and the fireproof cover 30 to be In the state where the space S is held between the inner pipe 11 and the fireproof cover 30, it is possible to efficiently prevent the play between the inner pipe 11 and the fireproof cover 30.
Thus, since the space S is formed between the receiving port 13 of the inner pipe 11 and the fireproof cover 30, the heat of the fireproof cover 30 is not easily transmitted to the receiving port 13 due to the action of the gap. Further, vibration is hardly transmitted from the vertical pipe 10 to the concrete slab.
Further, since the elastic body 50 has the ring-shaped space Sr on the inner side, the thermal expansion and contraction of the inner tube 11 can be absorbed by the elastic body 50 and the ring-shaped space Sr, compared with the case where no space is provided. Thus, the amount of heat expansion and contraction absorption of the inner tube 11 can be increased.

Further, since the elastic body 50 includes the outer ring-shaped space Su corresponding to the inner ring-shaped space Sr, the elastic body 50 can be deformed in a balanced manner inward and outward in the radial direction.
Further, a wedge-shaped portion 24k that is inserted into a gap between the receiving port 13 of the inner tube 11 and the cylindrical portion 32 of the refractory cover 30 is formed at the outer peripheral end of the peripheral portion 24 of the sealing material 20, and therefore the wedge-shaped portion 24k. This makes it easier to form the space S between the receiving port 13 of the inner tube 11 and the fireproof cover 30.
In addition, as shown in FIG. 4, in a state where the vertical pipe 10 is passed through the through hole CH of the concrete slab Cs that partitions the upper floor and the lower floor of the apartment house, the lower end portion 12 (straight pipe section 12) of the vertical pipe 10. Various joints such as a flexible joint for a drain pipe, a socket with a cleaning port, and the like can be connected to the lower end portion. In general, a socket with a cleaning port is installed at every four layers for cleaning the standing tube 10.
Here, in the present embodiment, an example in which a fireproof double-layer pipe is used for the standing pipe 10 has been described, but it is also possible to apply to a horizontal branch pipe or the like, for example.

Moreover, as shown in FIG. 5, the length dimension of the inner pipe 11 is set to a length dimension that can be inserted into the through hole CH of the concrete slab CS in the apartment house, and the lower end portion of the straight pipe portion 12 of the inner pipe 11 is set. By fixing the fireproof double-layer tube socket 75, it is also possible to manufacture a fireproof double-layer tube expansion and contraction socket 70 having a heat expansion and contraction absorption structure having a receiving port. Here, for example, a ring-shaped one-touch joint material 76 formed of ceramic fiber or the like is sandwiched between the lower end portion of the outer tube 42 covering the inner tube 11 and the outer tube 74 of the socket 75 for the fireproof double-layer tube. Is preferable. Incidentally, the expansion and contraction of the fire-resistant double-layer pipe connected to the lower side of the socket of the fire-resistant double-layer pipe 75 is absorbed by the expansion and absorption structure of the receptacle of the drain pipe joint connected to the lower end of the fire-resistant double-layer pipe.
By using the expansion and contraction socket 70 for a fireproof double-layer pipe, piping can be made without joining the concrete slab CS.
The inner diameter of the inner flange 75t of the fireproof double-layer tube socket 75 is preferably set so that no step is formed between the inner wall surface of the inner tube 11 and the inner wall.
Moreover, it becomes easy to remodel a pipe | tube by using the expansion-and-contraction double socket 70 for fireproof two-layer pipes, and making piping into slab upper surface joining.
Further, in the present embodiment, an example in which the elastic body 50 is formed by a combination of, for example, a single rubber and the spaces Sr and Su has been shown. However, as shown in FIG. A foam 82 (for example, styrofoam) that fills a space defined by the cylindrical portion 32 of the fireproof cover 30 and the distal end surface 42f of the outer tube 42, and a flexible wedge-shaped cross section provided at the distal end of the foam 82 It is also possible to configure it from a functional material 84 (for example, rubber). Note that the flexible material 84 is not necessarily solid, and for example, fluid butyl rubber that is difficult to solidify may be press-fitted with a gun so as to have a substantially wedge-shaped cross section. This improves the vibration isolation effect.

In the present embodiment, the peripheral portion 24 of the sealing material 20 is fixed to the distal end surface 13f and the chamfered portion 13x of the receiving port 13 of the inner tube 11 with an adhesive, but the sealing material is not used without using the adhesive. It is also possible to heat-seal or ultrasonically weld the peripheral edge 24 of 20 to the tip surface 13 f of the receiving port 13 of the inner tube 11.
Further, since the cylindrical portion 32 of the fireproof cover 30 is fixed to the outer tube 42 with the tapping pin 32t in a state where the elastic body 50 and the peripheral edge portion 24 of the sealing material 20 receive a pressing force from the axial direction, the sealing material Even if the peripheral edge 24 of the 20 or the elastic body 50 deteriorates and shrinks with time, no gap or the like is generated.
In the present embodiment, the fireproof cover 30 is fixed to the tip of the outer tube 42 with the tapping pin 32t and the fireproof joint material 59. However, the fireproof cover 30 can be secured only with the fireproof joint material 59.

It is a longitudinal cross-sectional view of the receptacle part of the fireproof two-layer pipe concerning Embodiment 1 of this invention. It is sectional drawing (A figure) of a sealing material, and the enlarged view (B figure) showing the example of a change of a sealing material. It is sectional drawing of an elastic body. It is a model side view showing the construction example of a fireproof two-layer pipe. It is a longitudinal cross-sectional view showing the example of a change of a fireproof two-layer pipe. It is a longitudinal cross-sectional view showing the example of a change of an elastic body. It is the external view and longitudinal cross-sectional view of the conventional fireproof two-layer pipe.

Explanation of symbols

10 Stand pipe (fireproof double-layer pipe)
11 Inner pipe 13 Receiving port 13w Expanding part 20 Sealing material 22 Seal body part 24 Peripheral part 24k Wedge-shaped part (wedge-shaped part)
30 Fireproof cover 34 Inner flange portion 32 Cylindrical portion 42 Outer tube 50 Elastic body 52 Inner inclined surface 54 Outer inclined surface 55m Inner groove 56m Outer groove 57 Base end surface

Claims (8)

An inner pipe comprising a pipe main body part, a pipe connection receiving port formed at an end of the pipe main body part, and an expanded part provided between the pipe main body part and the receiving port;
A fire-resistant outer tube covering the periphery of the tube body of the inner tube;
In a state of surrounding the expanded portion of the inner tube, the distal surface of the outer tube is restrained from the axial direction, and the distal surface of the outer tube and the expanded inner tube due to thermal expansion and contraction of the inner tube An elastic body configured to be elastically deformable by relative displacement with the part;
It has elasticity and is composed of a seal main body part and a peripheral part, and a sealing material that covers the front end surface of the receptacle at the peripheral part,
A cylindrical portion that covers from the outer peripheral surface of the receiving port to the outer peripheral surface of the distal end of the outer tube, and an inner collar portion that is provided at the distal end of the cylindrical portion and covers the peripheral portion of the sealing material that covers the distal end surface of the receiving port And a fireproof cover formed of a fireproof material,
The peripheral portion of the sealing material is configured to be elastically deformable by relative displacement between an inner flange portion of the fireproof cover and a front end surface of the receiving port due to thermal expansion and contraction of the inner tube. Layer tube. The fireproof double-layer pipe according to claim 1,
The fireproof double-layer tube, wherein the elastic body is inserted in a wedge shape between the expanded portion of the inner tube and the cylindrical portion of the fireproof cover. A fireproof double-layer pipe according to claim 2,
The elastic body is formed in a ring shape, and has an inner inclined surface that makes surface contact with the expanded portion of the inner tube, and a proximal end surface that makes surface contact with the distal end surface of the outer tube,
An internal groove is formed in a circumferential direction so as to cut out the corner portion at the corner portion between the inner inclined surface and the base end surface. A fireproof double-layer pipe according to claim 3,
The elastic body has an outer inclined surface in surface contact with the cylindrical portion of the fireproof cover,
An outer groove is formed in the circumferential direction so as to cut out the corner portion at the corner portion between the outer inclined surface and the base end surface in surface contact with the distal end surface of the outer cylinder. Double-layer tube. A fireproof double-layer pipe according to any one of claims 1 to 4,
A refractory double-layer pipe, characterized in that a wedge-shaped portion inserted into a gap between the receiving end of the inner pipe and the cylindrical portion of the refractory cover is formed at the outer peripheral end of the peripheral portion of the sealing material. A fireproof double-layer pipe according to any one of claims 1 to 5,
A fire-resistant double-layer pipe, wherein a cylindrical portion of the fire-resistant cover is fixed to an outer pipe by a fixing member. A fireproof double-layer pipe according to any one of claims 1 to 6,
The inner pipe, so that the outer pipe and the inner pipe can protrude from the lower surface of the concrete slab, with the upper surface of the fireproof cover substantially aligned with the upper surface of the concrete slab that partitions the upper floor and the lower floor of the apartment house, A dimension in the axial direction of the outer pipe and the fireproof cover is set. A fireproof double-layer pipe according to any one of claims 1 to 7,
The fireproof double-layered tube is characterized in that the peripheral portion of the sealing material is configured to be capable of increasing the wall thickness.

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