JP2003294179A - Fire resisting bilayer pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire resisting bilayer pipe wherein an outside diameter of a socket is reduced into a smaller size than a conventional pipe, while ensuring a fire resisting function and a seal function. <P>SOLUTION: The fire resistance bilayer pipe 10 of the invention comprises an inner pipe 11 formed at an end with the socket 13 for pipeline connection, a fire-resistance outer pipe 44 covering a periphery of the inner pipe 11, a seal element 20 formed of a seal body 22 and a rim 21 and covering an end surface 13f of the socket 13 and a peripheral end surface 13s of the socket 13 by the rim 21, and a fire resisting cover 30 formed of material having higher toughness than the outer pipe 44 with thinner thickness than the outer pipe 44 and covering the rim 21 of the seal element 20 and the peripheral end surface of the outer pipe 44. The bilayer pipe is characterized in that the rim 21 of the seal element 20 is fixed to the end surface 13f of the socket connection 13 and the fire resisting cover 30 is fixed at its portion covering the peripheral end surface of the outer pipe 44 to the outer pipe 44. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner tube having a receiving end for connecting a pipe formed at an end thereof, a sealing material attached to the receiving end, and a fire resistant outer tube covering the periphery of the inner tube. The present invention relates to a fireproof double-layer pipe.

[0002]

2. Description of the Related Art A fire-resistant double-layer pipe used as a standpipe for a drainage path in an apartment building or the like is generally shown in FIG.
As shown in FIG. 5, an inner pipe 51 made of hard vinyl chloride is provided, and a receiving port 51w into which a lower pipe (not shown) of the drainage pipe joint is inserted is formed in an upper portion of the inner pipe 51. A ring-shaped sealing material 60 that seals between the lower pipe of the drainage pipe joint inserted into the receiving port 51w and the receiving port 51w is attached to the upper portion of the receiving port 51w. The sealing material 60 is retained in the receiving opening 51w by being fitted into the ring-shaped seal groove 51m formed on the inner wall surface of the receiving opening 51w.

The circumference of the straight pipe portion of the inner pipe 51 is covered with a fire resistant straight pipe portion outer pipe 52 formed by hardening an incombustible material with mortar, and the circumference of the receiving port 51w of the inner pipe 51 and the straight pipe portion. The upper end of the outer tube 52 is covered with a receptacle outer tube 53 which is also formed by hardening a non-combustible material with mortar.

[0004]

However, in the above-mentioned fire-resistant double-layer pipe 50, since the seal groove 51m is formed inside the receiving port 51w of the inner pipe 51 to hold the sealing material 60, the seal groove 51m is formed. 51w for the depth of
The outer diameter dimension of is increased. Therefore, the outer diameter dimension of the receiving portion U of the refractory double-layered pipe 50 formed by covering the periphery of the receiving opening 51w with the receiving portion outer tube 53 also becomes large. Generally, when the fire-resistant double-layer pipe 50 is used as a vertical pipe, the receiving portion U of the fire-resistant double-layer pipe 50 is housed in the through hole of the concrete slab that separates the upper floor and the lower floor. For this reason, if the outer diameter of the receiving portion U increases, the through hole must also have a large diameter. However, when the through hole has a large diameter,
The through holes easily interfere with the reinforcing bars of the concrete slab, and the degree of freedom in arranging the through holes is significantly limited. Furthermore, it takes time and effort to backfill the through holes after construction. The present invention has been made in view of the above-mentioned problems, and the problem to be solved by the present invention is to provide a fire-resistant two-layer structure capable of reducing the outer diameter dimension of the receptacle while ensuring a fire-resistant function and a sealing function. Is to provide a tube.

[0005]

The above-mentioned problems can be solved by the inventions of the respective claims. The invention of claim 1 is composed of an inner pipe having a receiving end for connecting a pipe at an end thereof, a fire-resistant outer pipe covering the periphery of the inner pipe, a seal body portion and a peripheral portion, A sealing material that covers the tip surface of the receiving port and the outer peripheral surface of the receiving port at its peripheral portion, and a material that has a higher toughness than the outer tube and is formed thinner than the outer tube. And a fireproof cover that covers the outer peripheral surface of the tip of the outer tube, the peripheral portion of the sealing material is fixed to the tip surface of the receiving port,
The fireproof cover is characterized in that a portion covering the outer peripheral surface of the tip of the outer tube is fixed to the outer tube.

According to the present invention, since the peripheral portion of the sealing material is fixed to the tip surface of the receiving port while covering the tip surface of the receiving port and the outer peripheral surface of the tip of the receiving port, as in the conventional case, It is not necessary to form a groove or the like for fitting the sealing material inside the receiving port. Therefore, the outer diameter of the receiving port of the inner tube can be reduced by the amount that the groove or the like is unnecessary. Also, since the fireproof cover is made of a material with higher toughness than the outer tube and is made thin, even if the tip outer peripheral surface of the outer tube is covered by the fireproof cover, the outer diameter of the receiving part of the double-layer fireproof tube increases. The amount is very small. In other words, the outer diameter of the receiving portion increases by the thickness of the fireproof cover, but the outer diameter of the receiving portion of the inner pipe becomes smaller, so the outer diameter of the receiving portion of the fireproof double-layer pipe can be made smaller than before. . Here, since the fireproof cover is configured to cover from the peripheral edge of the sealing material to the outer peripheral surface of the tip of the outer tube, the fireproof function of the receiving portion of the fireproof double-layer tube is ensured. Further, since the peripheral edge portion of the sealing material is fixed to the tip end surface of the receiving port and the peripheral edge portion of the sealing material covers the tip outer peripheral surface of the receiving port, the sealing material is less likely to be deformed radially inward of the receiving port. For this reason,
When the other pipe is inserted into the receiving port, the sealing material does not easily come off from the receiving port, and the sealing function of the receiving port portion is also secured. Here, the drainage pipe includes not only long pipes but also expansion and contraction short pipes and short pipe joints that connect the pipes to each other. In addition, according to the present invention, there is an advantage that the shape of the receiving portion of the fire-resistant double-layer pipe is simple, it is easy to manufacture, and the cost is comprehensively low.

Further, according to the invention of claim 2, the inner pipe having the receiving end for connecting the pipe at the end portion and the periphery of the inner pipe are covered, and the axial direction is more than the front end surface of the receiving end of the inner pipe. It is composed of a fire-resistant outer tube having a projecting portion protruding to the outside, a seal main body portion and a peripheral edge portion, and the peripheral edge portion is formed from the tip surface of the receiving port and the inner peripheral surface of the protruding portion of the outer tube. And a sealing material whose peripheral portion covers the tip surface of the protruding portion of the outer tube and which is made of a material having higher toughness than the outer tube and which is thinner than the outer tube. It has a fireproof cover covering from the peripheral edge of the sealing material to the tip outer peripheral surface of the outer tube, and the peripheral edge of the sealing material and the fireproof cover are the tip surface of the receiving port and the protruding portion of the outer tube. It is characterized in that it is fixed to the tip surface.
Therefore, according to the present invention, as in the case of the first aspect, the outer diameter dimension of the receiving portion of the fireproof double-layer pipe can be made smaller than before, and the fireproof function and the sealing function can be secured.

Further, according to the invention of claim 3, the inner pipe having a receiving end for pipe connection formed at an end thereof and the periphery of the inner pipe are covered, and the inner pipe is axially arranged in the axial direction more than the front end surface of the receiving port. It is composed of a fire-resistant outer tube having a protruding portion protruding to the outer surface, a seal body portion and a peripheral edge portion, and the peripheral edge portion is formed from the tip surface of the receiving port and the inner peripheral surface of the protruding portion of the outer tube. A sealing material fitted in the recessed portion, a material having a higher toughness than the outer tube and formed thinner than the outer tube, and having a fireproof cover for covering a peripheral edge portion of the sealing material, The peripheral portion of the sealing material and the fireproof cover are fixed to the tip surface of the receiving port. For this reason,
According to the present invention, as in the case of the first aspect, the outer diameter dimension of the receiving portion of the fireproof double-layer pipe can be made smaller than before, and the fireproof function and the sealing function can be secured.

Further, as described in claim 4, when the peripheral edge portion of the sealing material is fixed to the tip surface of the receiving port by the screw member, the work of attaching the sealing material to the receiving port becomes easy. Further, as described in claim 5, the peripheral edge portion of the sealing material may be fixed to the receiving port by adhesion. Here, the term "adhesion" includes not only adhesion by an adhesive but also fusion bonding and the like.

Further, as described in claim 6, the fireproof cover may be fixed to the outer pipe or the inner pipe by a screw member,
As described in claim 7, it may be fixed to the outer peripheral surface of the distal end of the outer tube by a fireproof tape.

Further, according to the invention of claim 8, the seal main body of the seal material is formed with a groove in the circumferential direction in which the adhesive can be held on the surface with which the pipe inserted into the receiving port abuts. Therefore, if the adhesive is set in the groove, when the pipe is inserted into the receiving port, the adhesive extruded from the groove further improves the sealing property between the sealing material and the pipe. Further, as described in claim 9, even if an adhesive is interposed between the inner peripheral surface of the receiving port and the outer peripheral surface of the seal main body portion facing each other, the sealing property between the seal material and the pipe is improved. To do.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Hereinafter, a fire-resistant double-layer pipe according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 7. The fire-resistant double-layer pipe according to the present embodiment is a pipe used for a standpipe of a drainage route in a housing complex such as a condominium, and FIG. 1 is a vertical cross-sectional view of a receiving portion of the fire-resistant double-layer pipe. FIG. 2 is a vertical sectional view (FIG. A) and a plan view (FIG. B) of the fireproof cover of the fireproof double-layer pipe, and FIG. 3 is a vertical sectional view of the sealing material. Further, FIG. 4 is a vertical cross-sectional view showing a construction example using a fireproof double-layer pipe, and FIGS. 5 to 7 are vertical cross-sectional views showing a modification example of the fireproof double-layer pipe.

The refractory double-layer pipe 10 is provided with an inner pipe 11 made of, for example, hard vinyl chloride. As shown in FIG. 1 (A), the inner pipe 11 is composed of a straight pipe portion 12 and a receptacle 13 formed at the tip of the straight pipe portion 12 (the upper end in FIG. 1). The lower pipe 72 (see FIG. 4) of the drain pipe joint 70, which will be described later, is connected. Between the straight pipe portion 12 of the inner pipe 11 and the receiving port 13, a tapered boundary widening portion 14 that widens on the receiving port 13 side is formed. In addition,
The inclination angle θ of the boundary expanding portion 14 with respect to the axis of the inner pipe 11 is preferably set to about 30 °.

At the tip (upper end) of the receiving port 13 of the inner pipe 11, a sealing material 20 for sealing between the drain pipe joint 70 connected to the receiving port 13 and the receiving port 13 is mounted. The sealing material 20 is formed of rubber, for example, in a ring shape (see FIG. 1A and FIG. 3). Here, it is preferable to use a thermal expansion rubber as the rubber. This improves the sealing property when the hot drainage flows. The sealing material 20 is composed of a seal main body 22 and a peripheral edge portion 21, and the peripheral edge portion 21 covers the distal end surface 13f and the distal outer peripheral surface 13s of the receiving port 13 as shown in FIG. 1 (B). ing.

The peripheral edge portion 21 of the sealing material 20 is formed in a substantially horizontal "L" shape in a vertical cross-section and has a substantially constant thickness. As shown in FIGS. 21u, the lower flat surface 21d, the outer peripheral surface 21r, and the inner peripheral surface 21t. The lower flat surface 21d of the peripheral edge portion 21 and the inner peripheral surface 21t are formed substantially at right angles, and the peripheral edge portion 21 is formed in the receiving port 13
The lower flat surface 21d makes surface contact with the front end surface 13f of the receiving opening 13, and the inner peripheral surface 21t makes surface contact with the front end outer peripheral surface 13s of the receiving opening 13 in a state of being covered with the cover.

Since the inner peripheral surface 21t is formed on the peripheral edge portion 21 of the sealing material 20, the sealing material 20 can be easily positioned coaxially with the receiving opening 13 only by covering the peripheral edge portion 21 on the receiving opening 13. become able to. Further, the action of the inner peripheral surface 21t of the peripheral edge portion 21 makes it difficult for the sealing material 20 to be deformed radially inward of the receiving port 13. Here, the width dimension of the lower flat surface 21d of the peripheral edge portion 21 is the tip surface 1 of the receiving port 13.
It is set to be almost equal to the width dimension of 3f. Further, the height dimension of the inner peripheral surface 21t of the peripheral edge portion 21 is set to be about 1/2 of the width dimension of the lower flat surface 21d. The height dimension of the inner peripheral surface 21t can be made slightly smaller or larger than this value.

The seal body portion 22 of the seal member 20 is a portion for sealing between the lower pipe 72 of the drainage pipe joint 70 inserted into the receiving port 13 and the receiving port 13, and has a vertical cross-sectional shape formed into a substantially wedge shape. There is. The seal main body 22 of the seal material 20 is in a state where the peripheral edge portion 21 is covered with the receiving port 13,
It is located radially inward of the inner wall surface of the receiving port 13. Further, in this state, the seal main body 22 has the receptacle 1
The seal main body portion 22 is formed at a predetermined inclination angle with respect to the lower flat surface 21d and the upper flat surface 21u of the peripheral edge portion 21 so as to incline toward the inner side of 3.

A ring-shaped thin portion 22x is formed at the base end of the seal main body 22 on an extension line of the upper flat surface 21u of the peripheral portion 21, and the thin thin portion 22x and the surface of the seal main body 22 are formed. Groove 22 capable of holding an adhesive or the like between
m is provided.

Around the receiving port 13 of the inner pipe 11 and the straight pipe portion 1
As shown in FIG. 1 (A) and the like, the periphery of 2 is covered with a receiving port outer tube 44 and a straight tube outer tube 42 which are formed by solidifying a non-combustible material, fibers and the like with mortar. Outer tube 4
4 is formed in a tubular shape in advance with a predetermined thickness dimension, and the inner diameter dimension of the receiving portion outer tube 44 is set according to the outer diameter dimension of the receiving opening 13 of the inner tube 11. Further, the length dimension of the receiving port outer tube 44 is set to a value larger than the length dimension of the receiving port 13 by a predetermined dimension. Straight outer tube 42
Is also preformed into a tubular shape with a predetermined thickness,
The inner diameter of the straight pipe part outer pipe 42 is the straight pipe part 12 of the inner pipe 11.
It is set according to the outer diameter of. The length dimension of the straight pipe outer tube 42 is set according to the length dimension of the straight pipe portion 12.

As shown in FIG. 1 (A), the receptacle outer tube 4
The inner diameter dimension of 4 is set larger than the outer diameter dimension of the straight tube outer tube 42. Therefore, the upper end of the straight outer pipe 42 can be covered with the lower end of the mouth outer pipe 44. In this way, the lower end portion of the receptacle outer pipe 44 and the straight pipe outer pipe 42
If they are overlapped with the upper end portion of the above, the fire resistance performance of the connecting portion of both 42 and 44 is improved. A gap SL is formed in a portion where the receptacle outer pipe 44 and the straight pipe outer pipe 42 overlap each other, and the gap SL is filled with the fireproof joint material 46.
Here, as the refractory joint material 46, for example, a material mainly made of cement is used.

The receiving portion outer tube 44 is the receiving portion outer tube 4
4 and the straight pipe outer pipe 42 are fixed to the straight pipe outer pipe 42 by, for example, a screw 47 or the like. here,
The screws 47 and the like are preferably provided at least at three or more locations in the circumferential direction of the receiving-portion outer tube 44. The screw 47 can be omitted. Further, the straight pipe portion outer pipe 42 is fixed at a position where the tip end surface 42u of the straight pipe portion outer pipe 42 is separated from the boundary widening portion 14 of the inner pipe 11 by a constant dimension X (for example, 11 mm). Accordingly, even if the inner pipe 11 thermally expands in the axial direction, the expansion is not hindered by the straight pipe outer pipe 42, and damage to the inner pipe 11 due to the thermal expansion can be prevented.

After the sealing material 20 is attached to the tip of the receiving port 13 of the inner tube 11 and the tip of the receiving port outer tube 44, the fireproof cover 30 is covered. The fireproof cover 30 is
The cover protects the tip of the receiving port 13 and the sealing material 20 from flames, and reinforces the tip of the receiving port 13 and the tip of the receiving port outer tube 44. As shown in FIGS. 1 and 2, etc., the fireproof cover 30 is formed by a cylindrical portion 32 and an inner flange portion 34 into a substantially inverted “L” -shaped vertical cross section. A curved portion 33 having an arcuate cross section is formed at the tip of the cylindrical portion 32, and an inner flange portion 34 is formed in a ring shape so as to project radially inward from the end portion of the curved portion 33. .

The width dimension (overhanging dimension) of the inner brim portion 34 of the fireproof cover 30 is at least the periphery of the sealing material 20 in a state in which the fireproof cover 30 covers the receiving port 13 of the inner pipe 11 and the receiving port outer pipe 44. The size is set so that the entire part 21 can be covered. Therefore, the peripheral edge portion 21 of the sealing material 20 has the inner flange portion 34 of the fireproof cover 30 and the receiving port 1.
It is held in the receiving port 13 in a state of being sandwiched between the tip end surface 13f of the No. 3 and the front end surface 13f. In addition, the inner flange portion 34 of the fireproof cover 30
Has three screw holes 34h formed at equal intervals in the circumferential direction, and a screw member 36 for fixing the fireproof cover 30 and the seal member 20 to the receiving port 13 of the inner pipe 11 is formed in the screw hole 34h.
Is passed through. The number of screw holes 34h may be three or more.

The length of the cylindrical portion 32 of the fireproof cover 30 is set to a value that can cover the outer peripheral surface of the distal end of the outer pipe 44 of the receiving portion within a predetermined range. The inner diameter of the cylindrical portion 32 is set to a value that is larger than the outer diameter of the receiving portion outer tube 44 by, for example, about 2 mm in consideration of the manufacturing accuracy of the receiving portion outer tube 44. Further, three screw holes (not shown) are formed in the cylindrical portion 32 of the fireproof cover 30 at equal intervals in the circumferential direction, and the fireproof cover 30 is received in the screw holes and fixed to the mouth portion outer tube 44. The screw member 37 is inserted. The number of screw holes may be three or more.

The fireproof cover 30 is formed, for example, by press-molding a stainless plate having a wall thickness of 0.6 mm or more. In addition to the stainless plate, for example, the thickness of 0.6m
It is also possible to use a coated steel plate, a plated steel plate, a vibration-damping steel plate or an aluminum alloy plate having a size of m or more. Further, it is also possible to use a material containing ceramics or carbon fibers deposited with ceramics. That is, any material having a higher rigidity than the sealing material 20 and having a toughness to the extent that it can be made thin can be used as the material of the fire resistant cover 30.

Next, a procedure for forming the fire-resistant double-layer tube 10 will be briefly described. First, the straight pipe portion 12 of the inner pipe 11 is covered with the straight pipe portion outer pipe 42. At this time, the straight pipe outer pipe 42 is set in the straight pipe portion 12 of the inner pipe 11 so that the tip end surface 42u of the straight pipe outer pipe 42 is separated from the boundary widening portion 14 of the inner pipe 11 by a constant dimension X. It Further, the receiving port 13 of the inner pipe 11
The tip of the straight outer pipe 42 is covered with the outer outlet pipe 44. In this state, the receiving port 13 of the inner pipe 11
Protrudes from the tip of the receiving-portion outer tube 44 by the amount covered by the sealing material 20.

Next, the receptacle outer pipe 44 and the straight pipe outer pipe 42.
The space SL formed between the inner space and the outer space is filled with the fireproof joint material 46, and the screw 47 is screwed into the overlapping portion of the receptacle outer pipe 44, the fireproof joint member 46 and the straight pipe portion outer pipe 42 from the outside in the radial direction. . As a result, the receptacle outer pipe 44 is fixed to the straight pipe outer pipe 42, and the straight pipe portion 12 of the inner pipe 11 and the surroundings of the receptacle 13 are covered by the straight pipe outer pipe 42 and the receptacle outer pipe 44.

Next, the peripheral edge portion 21 of the sealing material 20 is covered on the tip portion of the receiving port 13 of the inner pipe 11, and the sealing material 20 is sealed.
Are coaxially positioned with respect to the receiving port 13. In this state, the tips of the receiving port 13 of the inner pipe 11 and the receiving port outer pipe 44 are covered with the fireproof cover 30, and the inner flange portion 34 of the fireproof cover 30 together with the peripheral edge portion 21 of the sealing material 20 is screwed with the screw member 3
It is fixed to the tip surface 13f of the receiving port 13 by 6. Further, the cylindrical portion 32 of the fireproof cover 30 is fixed to the receptacle outer pipe 44 by the screw material 37, and the fireproof double-layer pipe 10 is completed.

Here, in the above-mentioned molding procedure, an example in which the sealing material 20 is set in the receiving port 13 of the inner pipe 11 and then the fireproof cover 30 is covered, but after the sealing material 20 is bonded to the fireproof cover 30, Inner tube 1 by putting both 20 and 30 together
A method of attaching to the receiving port 13 of 1 is also possible. The sealing material 20 and the fireproof cover 30 may be bonded to each other using an adhesive, or the sealing material 20 may be fused to the fireproof cover 30. Further, when the sealing material 20 is molded with a mold (not shown), the fireproof cover 30 may be inserted into the mold.

Further, in the above-described molding procedure, after the straight pipe portion 12 and the receiving port 13 of the inner pipe 11 are covered with the straight pipe outer pipe 42 and the receiving port outer pipe 44, the sealing material 20 and the fireproof cover 30 are provided.
Although the example of attaching and to the receiving port 13 of the inner tube 11 has been shown, this procedure can be reversed. in this case,
First, the seal member 20 and the fireproof cover 30 are attached to the receiving port 13 of the inner pipe 11, and the straight pipe portion 12 of the inner pipe 11 is covered with the straight pipe portion outer pipe 42. Next, in this state, the receiving port 13 of the inner pipe 11
Then, the tip end of the straight pipe outer pipe 42 is set in the receiving outer pipe forming die, and refractory mortar is poured into the receiving outer pipe forming die to form the receiving outer pipe 44.

When the receiving opening 13 of the inner tube 11 and the like are set in the receiving outer tube forming die, the boundary expanding portion 14 of the inner tube 11 is set.
In order to prevent the refractory mortar from entering into the surroundings, it is necessary to surround the boundary expanding portion 14 with vinyl tape or the like. As described above, in the method of molding the receiving port outer tube 44 with the receiving port outer tube molding die, since the refractory mortar enters the screw hole of the cylindrical portion 32 of the fireproof cover 30, the cylindrical portion 32 of the fireproof cover 30 receives the receiving portion. It can be automatically fixed to the outer tube 44. Therefore, the screw material 37 and the like can be omitted. After that, the receiving port 13 of the inner pipe 11 and the sealing material 2
No. 0, the fireproof cover 30, the receptacle outer tube 44, etc. are collectively referred to as the receptacle U of the fireproof double-layer tube 10.

Next, an example of constructing a drainage route using the above-mentioned fireproof double-layer pipe 10 will be described with reference to FIG. Note that FIG. 4 shows a construction completion drawing. First, the receiving portion U of the fireproof double-layer pipe 10 is inserted into the through hole SBh of the concrete slab SB on the B floor (upper floor), and the fireproof double-layer pipe 10 is erected while rising. Next, the fireproof double-layer pipe 10 is straightly lowered, and the lower end portion of the inner pipe 11 of the fireproof double-layer pipe 10 is inserted into the upper receptacle of the drainage pipe joint (not shown) on the A floor. As a result, the lower side of the refractory double-layer pipe 10 is connected to the upper receptacle of the drainage pipe joint. In addition, a mechanism capable of absorbing thermal expansion and contraction (about 11 mm) of the inner pipe 11 of the refractory double-layer pipe 10 is provided at the upper port of the drainage pipe joint.

In this state, the receiving portion U of the fireproof double-layer pipe 10
The upper end of is at a height position almost equal to the upper surface of the concrete slab SB on the B floor. Here, the length dimension of the fire-resistant double-layer pipe 10 is adjusted in advance, for example, according to the height position of the drainage pipe joint on the A floor and the height position of the upper surface of the slab SB on the B floor. It is also possible to project the receiving portion U of the fire-resistant double-layer pipe 10 from the upper surface of the concrete slab SB depending on the level of the horizontal drain pipe 75.

Next, after an adhesive (not shown) is set in the groove 22m of the sealing material 20 provided in the receiving portion U of the fireproof double-layer pipe 10, the lower pipe 72 of the drainage pipe joint 70 on the B floor is set. Is inserted into the receptacle 13 of the fire-resistant double-layer tube 10. At this time, the lower pipe 72 of the drain pipe joint 70 comes into contact with the seal body 22 of the seal member 20, and the tip portion of the seal body 22 is pressed downward by the lower pipe 72.
As a result, the tip portion of the seal body 22 moves downward while elastically deforming and expands, and the lower pipe 72 of the drain pipe joint 70 is passed through the seal body 22. As a result, the lower pipe 72 of the drain pipe joint 70 and the fire-resistant double-layer pipe 10
The space between it and the receiving port 13 is sealed.

Further, when the lower pipe 72 of the drain pipe joint 70 abuts the seal body 22 of the seal member 20, the thin portion 22x forming the groove 22m is pressed, and the adhesive is extruded from the groove 22m. . As a result, the adhesive penetrates between the lower pipe 72 of the drain pipe joint 70 and the seal body 22 and the lower pipe 72 of the drain pipe joint 70.
The sealing property between the fireproof double-layer tube 10 and the receiving port 13 of the fireproof double-layer tube 10 is further improved. The adhesive may be set between the inner peripheral surface of the receiving port 13 and the outer peripheral surface of the seal body 22 that face each other. In this way, the seal becomes more reliable.

Further, as described above, the peripheral edge portion 21 of the sealing material 20 has the refractory cover 30 and the tip surface 13f of the receiving port 13.
It is fixed to the tip surface 13f of the receiving port 13 by a screw member 36 in a state of being sandwiched between the
The inner peripheral surface 21t of No. 1 is in surface contact with the tip outer peripheral surface 13s of the receiving port 13. For this reason, the sealing material 20 is held in the receiving opening 13 in a state in which it is difficult to deform inward of the receiving opening 13 in the radial direction. Therefore, even if the tip of the lower pipe 72 of the drainage pipe joint 70 is caught by the seal material 20, the seal material 20 does not come off from the receiving port 13 during the insertion process of the lower pipe 72.

Further, since the front end surface 13f of the receiving port 13 is covered with the sealing material 20 and the fireproof cover 30, and the front end portion of the receiving port outer pipe 44 is covered with the fireproof cover 30, the drain pipe joint 70 of Even if the end surface of the lower pipe 72 collides with the receiving portion U of the fireproof double-layer pipe 10, there is no inconvenience that the receiving portion U is damaged. In this way, when the connection between the lower pipe 72 of the drainage pipe joint 70 on the B floor and the receiving port 13 of the refractory double-layer pipe 10 is completed, the drainage lateral branch pipe 75 on the B floor is connected to the drainage pipe joint 70, and Fire-resistant double-layer tube 1 on the upper floor
0 is connected. Then, when the piping of the drainage path is completed, the through hole SBh of the concrete slab SB is backfilled, and the receiving portion U of the fire-resistant double-layer pipe 10 and its vicinity are fixed to the concrete slab SB.

As described above, according to the fire-resistant double-layer pipe 10 of this embodiment, the peripheral edge portion 21 of the sealing material 20 is sandwiched between the fire-resistant cover 30 and the tip surface 13f of the receiving port 13,
Since the structure is fixed to the tip surface 13f of the receiving port 13, it is not necessary to form a groove or the like for fitting the sealing material inside the receiving port as in the conventional case. Therefore, the outer diameter dimension of the receiving port 13 of the inner pipe 11 can be reduced by the amount that the groove or the like is unnecessary. Further, since the fireproof cover 30 is made of a material having a higher toughness than that of the receptacle outer pipe 44 and is thin, even if the tip outer peripheral surface of the receptacle outer pipe 44 is covered with the fireproof cover 30, the fireproof double-layer pipe 10 The amount of increase in the outer diameter dimension of the receiving portion U is small. That is, the fireproof cover 30
Although the outer diameter dimension of the receiving portion U increases by the thickness of the inner diameter of the inner pipe 11, the receiving portion 13 of the inner pipe 11 has a smaller diameter. it can.

Further, since the fireproof cover 30 covers the peripheral portion 21 of the sealing material 20 to the outer peripheral surface of the tip of the receiving portion outer tube 44, the fireproofing function of the receiving portion U of the fireproof double-layer tube 10 is ensured. It Further, the peripheral edge portion 21 of the sealing material 20 is fixed to the front end surface 13 f of the receiving opening 13, and the peripheral edge portion 21 of the sealing material 20 is fixed to the front end outer peripheral surface 1 of the receiving opening 13.
Since it covers 3s, the sealing material 20 is less likely to be deformed radially inward of the receiving port 13. For this reason, when the pipe is inserted into the receiving port 13, the sealing material 20 is less likely to come off the receiving port 13, and the sealing function of the receiving port portion U is also ensured.

The peripheral edge portion 21 of the sealing material 20 is sandwiched between the tip surface 13f of the receiving port 13 and the fireproof cover 30, and the peripheral edge portion 21 of the fireproof cover 30 and the sealing material 20.
And the sealing material 20 are fixed to the receiving port 13 with the screw member 36.
Installation work with is easy.

Further, in this embodiment, an example in which a hard vinyl chloride pipe is used as the inner pipe 11 has been shown, but a polyethylene pipe, a cross-linked polyethylene pipe, a polycarbonate pipe or the like can be used in addition to the hard vinyl chloride pipe. is there. Since the resin pipe can be used for the inner pipe 11 as described above, corrosion of the inner pipe 11 can be effectively prevented.

Further, in the present embodiment, the inner flange portion 34 of the fireproof cover 30 and the peripheral edge portion 21 of the sealing material 20 are fixed to the tip surface 13f of the port 13 with the screw material 36, and the screw material 37 is used to fix the fireproof cover 30. An example in which the cylindrical portion 32 is fixed to the receiving portion outer tube 44 has been shown, but as shown in FIGS. 5A and 5B, the fireproof cover 30 and the sealing material 20 are fixed without using the screw members 36 and 37. It is also possible to do so.

That is, the peripheral edge portion 21 of the sealing material 20 is adhered to the tip end surface 13f and the tip outer peripheral surface 13s of the receiving port, and the inner flange portion 34 of the fireproof cover 30 is adhered to the peripheral edge portion 21 of the seal material 20, The sealing material 20 and the fireproof cover 30 are fixed to the receiving port 13 of the inner pipe 11. Also, the fireproof cover 3
The cylindrical portion 32 of No. 0 is fixed to the receptacle outer tube 44 by the fireproof tape 49. Here, as the fireproof tape 49,
A metal tape or the like is generally used. Further, a tape such as a thermal expansion refractory material may be wrapped. In addition, fireproof tape 49
Is wound in the circumferential direction from the end of the cylindrical portion 32 of the fireproof cover 30 to the outer peripheral surface of the receptacle outer pipe 44. The fireproof tape 49 may be wrapped around the fireproof cover 30 or the like,
It may be partially wound at predetermined intervals.

As described above, since the sealing material 20 and the fireproof cover 30 can be fixed to the receiving port 13 and the receiving port outer tube 44 without using the screw members 36 and 37, the mounting work of the sealing material 20 and the fireproof cover 30 is further performed. It will be easier. Also,
The fireproof tape 49 also has an effect of suppressing vibration of the fireproof cover 30. The inner flange portion 34 of the fireproof cover 30 and the peripheral edge portion 21 of the seal material 20 are fixed to the tip surface 13f of the receiving port 13 with the screw member 36, and the cylindrical portion 32 of the fireproof cover 30 is fixed with the fireproof tape 49 to the outside pipe of the receiving port portion. It is also possible to fix it to 44. In addition, the inner flange portion 34 of the fireproof cover 30 and the sealing material 2
The edge surface 13 of the receiving port 13 is adhered to the peripheral edge portion 21 of 0.
Then, the cylindrical portion 32 of the fireproof cover 30 is fixed to the screw member 37
It is also possible to fix it to the receiving portion outer tube 44 with.

In this embodiment, the fire-resistant double-layer pipe 10 used for the vertical pipe has been described as an example, but as shown in FIG. 6, both expansion and contraction receivers used for connecting pipes to each other are used. The present invention can be applied to the socket 80. That is,
The expansion and contraction receiving socket 80 includes an inner pipe 82 and an outer pipe 88 that covers the periphery of the inner pipe 82. The inner pipe 82 is formed with a first receiving port 83 into which one pipe (not shown) is inserted and a second receiving port 84 into which the other pipe (not shown) is inserted. A ring-shaped step portion 85 is formed between the first receiving port 83 and the second receiving port 84 for partitioning the two receiving ports 83, 84. The inner pipe 82 is formed such that the first receiving port 83 is slightly larger in diameter than the second receiving port 84. Hereinafter, description will be made assuming that the first receiving port 83 is the tip end side of the expandable telescopic receiving socket 80.

The outer pipe 88 is formed in a cylindrical shape with a constant wall thickness, and the inner diameter of the outer pipe 88 is set so as to cover the first receiving port 83. Further, the length dimension of the outer pipe 88 is the inner pipe 8
It is set to a value slightly smaller than the length dimension of 2, and the tip of the first receiving port 83 is formed to slightly project from the tip surface of the outer tube 88. In the gap SL formed between the outer pipe 88 and the second receiving port 84, the fireproof joint material 8 is provided at the base end.
6 is filled. The sealing material 20 and the fireproof cover 30 are attached to the tip of the first receiving port 83 of the inner tube 82 and the tip of the outer tube 88. Since the sealing material 20 and the fireproof cover 30 have the same structure as the sealing material 20 and the fireproof cover 30 in the above-described fireproof double-layer tube 10, the description thereof will be omitted.

The first receiving port 83 of the telescopic receiving socket 80
One of the pipes is inserted so that it can move in the axial direction by a predetermined dimension. In addition, the other receiving pipe 84 (not shown) is provided in the second receiving opening 84 of the expandable telescopic receiving socket 80.
Is inserted and fixed with an adhesive or the like. As a result, one of the pipes and the other pipe are expanded and contracted into the receiving socket 8
0, and one of the pipes is held so as to be movable in the axial direction by a predetermined dimension with respect to both the expansion and contraction receiving sockets 80, so that the thermal expansion and contraction of both pipes is absorbed. Although not shown, there is also a telescopic piece receiving socket in which the second receiving opening 84 is a male insertion opening.

Further, for example, as shown in FIG. 7, the horizontal branch pipe receiving portion US of the drainage pipe joint 90 connecting the upper and lower standpipes (not shown) and the horizontal branch pipes (not shown).
It is also possible to apply the present invention to. Note that the structure of the lateral branch pipe receiving portion US is the same as the structure of the receiving portion U of the refractory double-layer pipe 10 described above, and a description thereof will be omitted. Further, although FIG. 7 illustrates the drain pipe joint 90 including one horizontal branch pipe receiving portion US, the present invention is applied to a drain pipe joint including a plurality of horizontal branch pipe receiving portions US (not shown). It is also possible. Further, the upper receiving port UJ of the drainage pipe joint 90 shown in FIG. 7 may have the same structure as the lateral branch receiving port US. The drain pipe joint may have a cleaning port or may have a structure without a cleaning port.

(Second Embodiment) Hereinafter, a fireproof double-layer pipe according to a second embodiment of the present invention will be described with reference to FIGS.
The fire-resistant double-layer tube 200 according to the present embodiment is an improvement of the structure of the receiving portion U of the fire-resistant double-layer tube 10 according to the first embodiment, and the other structures are the fire-resistant double-layer tube 10 according to the first embodiment.
It is similar to the structure of. Fireproof double-layer tube 20 according to the present embodiment
0, as shown in FIGS. 8 (A) and 8 (B), the tip portion of the receptacle outer tube 244 is the tip surface 2 of the receptacle 213 of the inner tube 211.
It is configured so as to protrude in the axial direction by a certain dimension from 13f. Therefore, a ring-shaped recess R is formed inside the tip portion (projection portion) of the receptacle outer tube 244 by the inner peripheral surface 244e of the projection portion and the tip surface 213f of the receptacle 213.

A sealing material 220 is attached to the tip of the receiving port 213 of the inner tube 211 and the tip of the receiving port outer tube 244. The seal material 220 is composed of a seal body 222 and a peripheral edge portion 221, and the peripheral edge portion 221 has a ring-shaped recess R and a tip end surface of the receptacle outer tube 244 as shown in FIG. 8B and the like. And 244f.

The peripheral portion 221 of the sealing material 220 is shown in FIG.
As shown in (C) and the like, the thick portion 221a and the thin portion 2
21b, the vertical cross-sectional shape is formed in a substantially horizontal "L" shape, and the thin portion 221b is provided around the thick portion 221a. Upper plane 221u of the thick portion 221a
And the upper flat surface 221u of the thin portion 221b are continuously provided, and the lower flat surface 221d of the thick portion 221a is provided.
And a lower plane 221t of the thin portion 221b are separated by a step surface 221r that is substantially perpendicular.

Here, the thick portion 221a of the peripheral portion 221.
The width dimension of the lower flat surface 221d is the same as that of the tip surface 2 of the receiving port 213.
The width is set to be approximately equal to 13f. The height dimension of the step surface 221r of the peripheral edge portion 221 is set to be substantially equal to the height dimension of the inner peripheral surface 244e of the projecting portion of the receiving portion outer tube 244. Further, the width dimension of the lower flat surface 221t of the thin portion 221b of the peripheral edge portion 221 is set to be substantially equal to the width dimension of the tip end surface 244f of the receiving portion outer tube 244. Therefore, in a state where the peripheral edge portion 221 of the sealing material 220 is covered with the receiving opening 213 and the receiving opening portion outer tube 244, the thick portion 221a of the peripheral edge portion 221 is fitted into the ring-shaped concave portion R and the peripheral edge portion 221. The thin-walled portion 221b covers the tip end surface 244f of the receiving-portion outer tube 244. In this state, the sealing material 220 is coaxially positioned with respect to the receiving port 213.

At the inner peripheral edge of the upper flat surface 221u of the thick portion 221a of the peripheral edge portion 221, a fireproof cover 23 to be described later is provided.
The locking recess 221y to which the 0 locking part 234f is hooked is formed in a ring shape. The seal body portion 222 of the seal material 220 has the same structure as the seal body portion 22 of the seal material 20 described in the first embodiment.
A ring-shaped thin portion 222x for holding an adhesive or the like is formed at the base end portion of 2.

After the sealing material 220 is attached to the tip of the receiving port 213 of the inner tube 211 and the tip of the receiving port outer tube 244, a fireproof cover 230 is covered. The fireproof cover 230 has basically the same structure as the fireproof cover 30 described in the first embodiment, and as shown in FIGS. 9 (A) and 9 (B) and the like, the fireproof cover 230 includes a cylindrical portion 232 and an inner flange portion 234 in a vertical cross-sectional shape. Are formed in a substantially inverted "L" shape. And the inner collar part 2
At the inner peripheral end (tip) of
The locking portion 234f that engages with 1y is formed by bending.

A first screw hole 234a is formed in the inner flange portion 234 of the fireproof cover 230 at a position on the axial extension line of the receiving port 213 of the inner tube 211, and the axial extension of the receiving port outer tube 244 is formed. The second screw hole 234b is formed at a position on the line. The first screw hole 234a is the first screw member 2
36a are holes through which 36a are formed at equal intervals in the circumferential direction. The second screw holes 234b are holes through which the second screw members 236b are inserted, and three second screw holes 234b are formed at equal intervals in the circumferential direction.

With the above-described structure, the sealing material 220 is attached to the receiving end 213 of the inner pipe 211 and the distal end of the receiving-portion outer pipe 244, and after the fireproof cover 230 is covered,
By the screw member 236a and the second screw member 236b, both the seal member 220 and the fireproof cover 230 are attached to the front end face 213f of the receiving port 213 and the front end face 244f of the receiving port outer tube 244.
When fixed to, the receptacle U of the fireproof double-layer pipe 200 is completed. As described above, also by the fire-resistant double-layer pipe 200 according to the present embodiment, the outer diameter dimension of the receiving portion of the fire-resistant double-layer pipe can be made smaller than before, and the fire-resistant function and the sealing function can be secured. In addition, the peripheral portion 2 of the sealing material 220
Since 21 is configured to entirely cover the tip surface 244f of the receptacle outer tube 244, even if an impact is applied to the receptacle U, the elasticity of the sealing material 220 makes it difficult for the tip corner portion of the receptacle outer tube 244 to be chipped. .

(Embodiment 3) A fire-resistant double-layer pipe according to Embodiment 3 of the present invention will be described below with reference to FIGS. The refractory double-layer pipe 300 according to the present embodiment is the same as the first embodiment.
The structure of the receiving portion U of the fire-resistant double-layer tube 10 according to the present invention is improved, and other structures are the same as the structure of the fire-resistant double-layer tube 10 according to the first embodiment. In the fire-resistant double-layer pipe 300 according to the present embodiment, as shown in FIGS. It is configured to project in the direction. Therefore, the inner peripheral surface 344 of the protruding portion is provided inside the tip portion (projecting portion) of the receiving portion outer tube 344.
A ring-shaped recess R is formed by e and the tip surface 313f of the receiving port 313.

A sealing material 320 is attached to the tip of the receiving port 313 of the inner tube 311 and the tip of the receiving port outer tube 344. The seal material 320 is composed of a seal body 322 and a peripheral edge 321. The peripheral edge 321 is fitted into the ring-shaped recess R as shown in FIG.

The peripheral portion 321 of the sealing material 320 is shown in FIG.
As shown in (C) and the like, the vertical cross section is formed into a substantially rectangular shape, and the upper flat surface 321u, the outer peripheral surface 321t, and the lower flat surface 3 are formed.
21d. Here, the width dimension of the lower flat surface 321d of the peripheral edge portion 321 is set to be substantially equal to the width dimension of the front end surface 313f of the receiving port 313. In addition, the peripheral portion 32
The height dimension of the outer peripheral surface 321t of No. 1 is the outer diameter of the receiving portion outer tube 344.
Is set to be approximately equal to the height dimension of the inner peripheral surface 344e of the protruding portion.

Therefore, the peripheral portion 321 of the sealing material 320 is
Is fitted in the ring-shaped recess R, the receiving port 313
The tip end surface 313f and the inner peripheral surface 344e of the projecting portion of the receiving portion outer tube 344 are covered with the peripheral edge portion 321. In this state, the sealing material 320 is coaxially positioned with respect to the receiving port 313. Upper plane 32 of the peripheral portion 321
A locking recess 321y, to which a locking portion 334f of the fireproof cover 330 described later is hooked, is formed in a ring shape at the inner peripheral end of 1u. Seal body 322 of the sealing material 320
Is the seal body 2 of the seal material 20 described in the first embodiment.
2 has the same structure as that of FIG. 2, and has a ring-shaped thin portion 322x for holding an adhesive or the like at the base end of the seal body 322.
Are formed.

A fireproof cover 33 is attached to the peripheral edge 321 of the sealing material 320 attached to the tip of the receiving port 313 of the inner pipe 311.
0 is covered. The fireproof cover 330 is shown in FIG.
As shown in (B) and the like, it is a ring-shaped plate, and the outer diameter dimension thereof is set to a value substantially equal to the outer diameter dimension of the sealing material 320. Further, the width dimension of the fireproof cover 330 is set to a value substantially equal to the width dimension of the peripheral edge portion 321 of the sealing material 320. Further, an engaging portion 334f that engages with the engaging recess 321y of the seal material 320 is formed by bending at the inner peripheral end (tip) of the fireproof cover 330. The material of the fireproof cover 330 is basically the same as the material of the fireproof cover 30 described in the first embodiment.

The fireproof cover 330 has screw holes 33.
For example, three 4a are formed at equal intervals in the circumferential direction,
The screw member 336a is adapted to pass through the screw hole 334a. With the above-described configuration, the peripheral edge portion 321 of the sealing material 320 is fitted into the ring-shaped recess R, and the fireproof cover 330 is further covered, and then the sealing material 320 and the fireproof cover 330 are both attached to the tip end surface 313f of the receiving port 313 with the screw material 336a. If fixed, the receptacle U of the fireproof double-layer tube 300 is completed.

As described above, the fire-resistant double-layer pipe 300 according to the present embodiment can also make the outer diameter of the receiving portion U smaller than the conventional one, and can also secure the fire-proof function and the seal function. Further, since the fireproof cover 330 does not cover the outer peripheral surface of the receptacle outer pipe 344, the outer diameter of the fireproof double-layer pipe 300 can be reduced by the thickness of the fireproof cover 330. Further, since the peripheral portion 321 of the sealing material 320 and the fireproof cover 330 can be made smaller than in the first and second embodiments, the cost of the fireproof double-layer pipe 300 can be reduced.

In the first to third embodiments, the seal main body 22 of the sealing material 20 has a thin wall portion 2 for holding an adhesive.
Although the example in which 2x, 222x, 322x are provided is shown, the thin portions 22x, 222x, 322x can be omitted. In the first and second embodiments, the cylindrical portions 32 and 232 of the fireproof covers 30 and 230 are attached to the screw members 37,
236a, 236b and the fireproof tape 49, the outer tube 4
Although the example of fixing to the fireproof cover 30, the fireproof cover 30,
If 230 is formed of a flexible material, the cylindrical portions 32 and 232 of the fireproof covers 30 and 230 are tightened from the surroundings by a band-shaped member, and the cylindrical portions 32 and 232 are received into the outer pipe 4 of the mouth.
It is also possible to fix it to 4,244.

In the first and second embodiments, the peripheral portions 21 and 221 of the sealing materials 20 and 220 are attached to the fireproof cover 3 respectively.
0,230 inner flanges 34,234 together with screw members 36,2
Although the example of fixing to the tip surfaces 13f and 213f of the receiving ports 13 and 213 with 36 has been shown, the sealing material 2 is a flat head screw material.
Receptacles 13 and 213 for peripheral portions 21 and 221 of 0 and 220
After fixing to the tip surfaces 13f and 213f of the fireproof cover 3
It is also possible to cover with 0,230. It is also possible to fix the sealing material 320 and the fireproof cover 330 of the third embodiment to the tip surface 313f of the receiving port 313 by adhesion or the like.

In the first to third embodiments, the receptacle U has been described by taking the fireproof double-layer pipe as an example. However, as shown in FIGS. 12 and 13, the receptacle U described in the first embodiment is described. It is also possible to apply the structure of (1) to the pipe P other than the fire-resistant double-layer pipe. Here, FIG. 13 shows an example in which the sealing material and the fireproof cover are fixed to the tip surface of the receiving port by adhesion or the like.
The bonding may be performed using an adhesive, or the sealing material may be fused to the fireproof cover. Further, when the sealing material is molded with a mold (not shown), a fireproof cover may be inserted into the mold. Also, for example,
As shown in FIG. 13, there is a possibility of omitting the screw member also in the other embodiments. In addition, as shown in FIG. 14, after the fireproof cover 430 is adhered to the sealing material 420, the inner peripheral surface 421 of the sealing material 420 is received and the outer peripheral surface 413r of the inlet 413 is formed.
And the sealing material and the fireproof cover are engaged with
It is also possible to fix it to the tip of the. Reference numeral 425 in FIG. 14 indicates that the pipe (not shown) is the receiving port 41.
3 is a projection for preventing the seal main body 422 from being misaligned when it is inserted into the seal body 3.

[0067]

According to the present invention, the outer diameter dimension of the receiving portion of the fireproof double-layer pipe can be made smaller than before while ensuring the fireproof function and the sealing function.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (FIG. A) of a receiving part of a fireproof double-layer pipe according to Embodiment 1 of the present invention, and an enlarged view of part B of FIG.
Is.

FIG. 2 is a vertical sectional view (FIG. A) of a fireproof cover of a fireproof double-layer pipe,
FIG. 4 is a plan view (FIG. B).

FIG. 3 is a vertical sectional view of a sealing material.

FIG. 4 is a vertical cross-sectional view showing a construction example using a fire-resistant double-layer pipe.

FIG. 5 is a vertical cross-sectional view (FIG. A) showing a modified example of the fire-resistant double-layer pipe.
3 is an enlarged view of a B part of FIG.

FIG. 6 is a vertical cross-sectional view showing a modified example of the fire-resistant double-layer pipe.

FIG. 7 is a vertical cross-sectional view showing a modified example of the fire-resistant double-layer pipe.

FIG. 8 is a vertical cross-sectional view (FIG. A) of the receiving part of the fireproof double-layer pipe according to the second embodiment of the present invention, and an enlarged view of a main part of FIG.
Is.

FIG. 9 is an enlarged vertical sectional view of the fireproof cover of the fireproof double-layer pipe (A
FIG. 4) is a vertical cross-sectional view of the fireproof cover (FIG. B) and a vertical cross-sectional view of the sealing material (FIG. C).

FIG. 10 is a vertical cross-sectional view (FIG. A) of a receiving portion of a fire-resistant double-layer pipe according to Embodiment 3 of the present invention, and an enlarged view of a main part of FIG.
Figure).

FIG. 11 is an enlarged vertical sectional view of the fireproof cover of the fireproof double-layer pipe (A).
FIG. 4) is a vertical cross-sectional view of the fireproof cover (FIG. B) and a vertical cross-sectional view of the sealing material (FIG. C).

FIG. 12 is a vertical cross-sectional view of a receiving portion of a pipe other than a fireproof double-layer pipe.

FIG. 13 is a vertical cross-sectional view of a receiving portion of a pipe other than a fireproof double-layer pipe.

FIG. 14 is a vertical cross-sectional view of a receiving portion of a pipe other than the fire-resistant double-layer pipe.

15A and 15B are an outer diameter view and a vertical sectional view of a receiving portion of a conventional fire-resistant double-layer pipe.

[Explanation of symbols]

10 Fireproof double layer pipe 11 inner tube 12 Straight pipe section 13 Receptacle 13f Tip surface 20 sealing material 21 Perimeter 22 Seal body 30 fireproof cover 32 Cylindrical part 34 Inner collar part 36 Screw material (screw member) 37 Screw material (screw member) 42 Straight tube outer tube (outer tube) 44 Receiving port outer tube (outer tube) 49 Fireproof tape 200 Fireproof double layer pipe 220 sealing material 230 Fireproof cover 300 fireproof double layer pipe 320 sealing material 330 Fireproof cover R ring-shaped recess

Claims (9)

[Claims] 1. An inner pipe having a receiving end for connecting a pipe formed at an end thereof, a fire-resistant outer pipe covering a periphery of the inner pipe, a seal main body portion, and a peripheral portion, and the peripheral edge thereof. A sealing material that covers the tip surface of the receiving port and the outer peripheral surface of the receiving port at a portion, and is formed to be thinner than the outer tube with a material having higher toughness than the outer tube, and from the peripheral portion of the sealing material. The outer tube has a fireproof cover that covers up to the outer peripheral surface of the tip, the peripheral edge of the sealing material is fixed to the distal end surface of the receiving port, the fireproof cover, the outer peripheral surface of the tip of the outer tube. A fire-resistant double-layer pipe, characterized in that the part covering it is fixed to the outer pipe. 2. An inner pipe having a receiving end for connecting a pipe formed at an end thereof, and a projecting portion that covers the periphery of the inner pipe and projects in the axial direction from the end surface of the receiving end of the inner pipe. It is composed of a fire-resistant outer tube, a seal body and a peripheral edge, and the peripheral edge is fitted into a recess formed by the tip surface of the receiving port and the inner peripheral surface of the protruding portion of the outer tube. A sealing material whose peripheral portion covers the tip surface of the protruding portion of the outer pipe, and which is made of a material having higher toughness than the outer pipe and is thinner than the outer pipe. It has a fireproof cover covering up to the outer peripheral surface of the tip of the outer tube, and the peripheral portion of the sealing material and the fireproof cover are fixed to the tip surface of the receiving port and the tip surface of the protruding portion of the outer tube. A fire-resistant double-layer pipe characterized by being present. 3. An inner pipe having a receiving end for connecting a pipe formed at an end thereof, and a projecting portion that covers the periphery of the inner pipe and protrudes in the axial direction from the end surface of the receiving end of the inner pipe. A seal that is composed of a fire-resistant outer tube, a seal body and a peripheral edge, and the peripheral edge is fitted into a recess formed by the tip surface of the receiving port and the inner peripheral surface of the protruding portion of the outer tube. Material, which is formed to be thinner than the outer tube with a material having higher toughness than the outer tube, and has a fireproof cover that covers the peripheral edge of the sealing material, and the peripheral edge of the sealing material and the The fireproof double-layer pipe is characterized in that the fireproof cover is fixed to the tip surface of the receiving port. 4. The fire-resistant double-layer pipe according to any one of claims 1 to 3, wherein a peripheral edge portion of the sealing material is fixed to a tip end surface of the receiving port by a screw member. Double layer tube. 5. The fire-resistant double-layer pipe according to any one of claims 1 to 3, wherein a peripheral edge portion of the sealing material is fixed to a tip end surface of the receiving port by adhesion. Layered tube. 6. The fire-resistant double-layer pipe according to claim 1, wherein the fire-resistant cover is fixed to the outer pipe or the inner pipe by a screw member. tube. 7. The fire-resistant double-layer pipe according to claim 1 or 2, wherein the fire-resistant cover is fixed to the outer peripheral surface of the tip of the outer pipe by a fire-resistant tape. Layered tube. 8. The fire-resistant double-layer pipe according to any one of claims 1 to 7, wherein the seal main body of the sealing material holds an adhesive on the surface with which the pipe inserted into the receiving port abuts. A refractory double-layer tube, characterized in that the feasible grooves are formed in the circumferential direction. 9. The fire-resistant double-layer pipe according to claim 1, wherein an adhesive is provided between the inner peripheral surface of the receiving port and the outer peripheral surface of the seal main body portion facing each other. A fire-resistant double-layer tube characterized by being inserted.