JPH08100881A - Fireproofing two-layer pipe joint, manufacture therof and fireproofing two-layer pipe connecting part structure using this fireproofing two-layer pipe joint - Google Patents

Abstract

PURPOSE: To provide a fireproofing two-layer pipe joint, its manufacturing method and a fireproofing two-layer pipe connecting part structure using this fireproofing two-layer pipe joint, maintaining stably for a long period a joint processing function in a connecting part between a fireproofing two-layer straight pipe and the fireproofing two-layer pipe joint further to simplify work with no apprehension of overlooking a joint processing part. CONSTITUTION: An annular packing 5 formed of an inorganic fiber heat insulating material is previously synthesized in socket end parts 4a, 4a of an outer pipe 4 forming a fireproofing two-layer pipe joint 1, to interpose the annular packing 5 between the socket end parts 4a, 4a of the outer pipe 4 of the fireproofing two-layer pipe joint 1 which must be connected and opening end parts 9a, 9a of outer pipes 9, 9 of fireproofing two-layer straight pipes 6, 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant double-layer pipe joint, a method of manufacturing the same, and a fire-resistant double-layer pipe joint structure using the joint.

[0002]

2. Description of the Related Art Generally, an inner tube made of a synthetic resin such as hard vinyl chloride is coated with a fire-resistant outer tube, for example, a fire-resistant double-layer tube in which a fiber-reinforced mortar coating tube is coated. , Smooth inner surface, excellent chemical resistance and water resistance,
Further, since it is covered with an outer pipe and has excellent fire resistance and heat insulation properties, it is widely used as a water supply pipe, a drain pipe, a ventilation pipe for ventilation, a distribution pipe, and the like of a building.

[0003] In order to connect the fire-resistant double-layer pipe, a fire-resistant double-layer pipe joint is used. The fire-resistant double-layer pipe joint is also made of an inner pipe made of a synthetic resin such as hard vinyl chloride and a fire-resistant pipe covering the inner pipe. It has an outer tube, for example a fiber reinforced mortar cladding tube.

The structure of the joint portion of the fireproof double-layer pipe using this fireproof double-layer pipe joint will be described with reference to FIG.

FIG. 5 is a cross-sectional view showing a joint for connecting a pair of refractory double-layer pipe straight pipes 21 and 21 with a refractory two-layer pipe joint 24.

[0006] The refractory double-layer pipe straight pipes 21 and 21 are made of synthetic resin such as hard vinyl chloride and the like.
The outer pipes 23, 23 having fire resistance and heat insulation properties such as fiber-reinforced mortar coated pipes for coating 2, 22. On the other hand, the fire-resistant double-layer pipe joint 24 also has an inner tube 25 made of a synthetic resin such as hard vinyl chloride and an outer tube 26 having fire resistance and heat insulation made of fiber reinforced mortar or the like covering the inner tube 25,
The inner diameters of the receiving ends 25a, 25a of the inner pipe 25 are the open ends 22a of the inner pipes 22, 22, of the refractory double-layer pipe straight pipes 21, 21, respectively.
22a is a size that can be fitted, and an annular projection 25b for restricting the amount of fitting of the fitted inner tubes 22, 22 is formed at the center of the inner peripheral surface thereof.

In order to connect the refractory double-layer straight pipes 21, 21 to each other via the refractory double-layer pipe joint 24, the open ends of the outer pipes 23, 23 of the refractory double-layer pipe straight pipes 21, 21 to be connected are connected. An adhesive is applied in advance to the outer circumferences of the open ends 22a, 22a of the inner tubes 22, 22 projecting from the portions, and these open ends 22a, 22a are applied.
To both end portions 25 of the inner pipe 25 of the fire-resistant double-layer pipe joint 24.
a and 25a, respectively, and are fitted and fitted to the fire-resistant double-layer straight pipes 21 and 2 respectively.
1, the open ends 23a, 23a of the outer pipes 23, 23 are connected to the receiving ends 26a, 2a of the outer pipes 26, 26 of the fire-resistant double-layer pipe joint 24.
6a to be connected.

Next, the outer pipe 2 of the refractory double-layer pipe straight pipes 21 and 21
The outer pipes 23 of the straight pipes 21, 21 are provided at the contact portions between the open ends 23 a, 23 a of the pipes 3, 23 and the receiving ends 26 a, 26 a of the outer pipe 26 of the fire-resistant double-layer pipe joint 24. A gap is produced due to the manufacturing accuracy of the production of the pipe 23 and the cutting precision thereof, and the outer pipes 23, 23 of the refractory double-layer pipe straight pipes 21, 21 are formed.
And the outer pipe 26 of the fire-resistant double-layer joint 24 are discontinuous, the dry-hardening joint material 27 mainly made of sodium silicate or cement is stretched in a string shape to form the straight pipes 21 and 2 of the fire-resistant double-layer pipe.
A joint treatment by a wet joint method in which the outer pipes 23, 23 of No. 1 and the end portions 26a, 26a of the outer pipe 26 of the fireproof two-layer joint 24 are wound around and covered. Has been applied.

As another joint treatment, a dry joint construction method is used. In this method, a band-shaped metal joint cover bent stepwise in cross section corresponding to the step between the outer peripheral surface of the outer pipe of the fire-resistant double-layer pipe straight pipe and the outer peripheral face of the outer pipe of the fire-resistant double-layer pipe joint is used. It is wound around the outer peripheral surface of the outer tube of the layered tube straight tube and the outer peripheral surface of the outer tube of the pipe joint, and tightened between both ends with screws and nuts.

As still another joint treatment, a flat band-shaped metal joint cover is provided, and an outer pipe receiving port of a fire-resistant double-layer pipe joint is formed such that one side edge covers an outer pipe end of a fire-resistant double-layer pipe straight pipe. Wind around the end and install it. Fill the gap created between the open end of the outer pipe of the refractory double-layer pipe straight pipe and the metal joint cover with the joint filler made of dry-hardened joint material or other non-combustible material. There are measures such as doing.

[0011]

In the joint treatment by the former wet joint construction method described above, the joint material applied to the abutting portion of the straight tube of the fireproof double-layer pipe and the joint of the fireproof double-layer pipe shrinks as it hardens with time. However, cracks and peeling may occur, which may cause the joint material to fall off, and may cause deterioration due to carbonation, which may cause problems such as difficulty in maintaining a stable joint function for a long period of time. .

On the other hand, in the latter, in the joint treatment using a metal joint cover, since the dimensions and shape of the joint cover are set in advance, the dimensions in manufacturing the fire-resistant double-layer pipe straight pipe and the fire-resistant double-layer pipe joint are set. If the shape is deformed based on the accuracy error, for example, the cross-sectional shape is deformed into an elliptical shape, etc., it will be difficult to install it, and the joint cover is made of metal. As a result, condensation cannot be obtained and the joint cover is corroded, and if the condensation occurs in the joint filler, the joint filler is dissolved and the filler flows out, ensuring a stable joint treatment function over a long period of time. It can be difficult.

Further, since these joint treatments are performed after the piping work to the building is completed, the work space is limited, the work is cumbersome, it is difficult to obtain a uniform joint treatment function, and the joint treatment is difficult. May drop.

Accordingly, an object of the present invention is to maintain the joint processing function of the joint between the fire-resistant double-layer pipe straight pipe and the fire-resistant double-layer pipe joint for a long period of time, thereby simplifying the work and improving the joint processing. It is an object of the present invention to provide a fire-resistant double-layer pipe joint which does not cause quality deterioration due to oversight of a part, a method of manufacturing the same, and a fire-resistant double-layer pipe joint structure using the joint.

[0015]

A refractory two-layer pipe joint according to the present invention for achieving the above object comprises an inner pipe made of synthetic resin, and an outer pipe having a fire resistance and a heat insulating property for covering the inner pipe. An inner pipe made of a synthetic resin in which the opening end of the inner pipe of the straight tube of the fireproof double-layer pipe is joined to the end of the receiving port, and the opening of the outer pipe of the straight pipe of the fireproof double-layer pipe by covering the inner pipe In a fire-resistant double-layer pipe joint having an end pipe joined to a receiving end end through an annular packing and having an outer tube having fire resistance and heat insulation, the annular packing is made of a non-combustible inorganic fiber heat insulating material, and the annular packing Surrounds the outer periphery of the inner pipe receiving end portion of the fireproof two-layer pipe joint and is combined with the receiving end portion of the outer tube of the fireproof two-layer pipe joint. The method for manufacturing a fire-resistant double-layer pipe joint according to the present invention is a synthetic resin inner pipe, an outer pipe having fire resistance and heat insulating properties for covering the inner pipe, and a composite at the receiving end of the outer pipe, and In a method for manufacturing a fire-resistant double-layer pipe joint having an annular packing made of a non-combustible inorganic fiber heat insulating material that surrounds the receiving end portion outer circumference of the inner pipe, the annular packing is fitted to the receiving end outer periphery of the inner pipe and exposed. It is characterized in that the outer surface of the inner tube is covered with an uncured outer tube material having fire resistance and heat insulation properties and cured to form an outer tube in which an annular packing is synthesized at the end of the receiving port. Another method of manufacturing a fire-resistant double-layer pipe joint according to the present invention is to synthesize an inner pipe made of synthetic resin, an outer pipe having fire resistance and heat insulating properties for covering the inner pipe, and a receiving end portion of the outer pipe, And from the non-combustible inorganic fiber heat insulating material that surrounds the outer circumference of the receiving end of the inner pipe In the annular packing and the production method of the refractory bilayer fitting with that, the annular mold is fitted to the socket end portion outer periphery of the inner tube,
The exposed outer peripheral surface of the inner pipe is coated with an uncured outer pipe material having fire resistance and heat insulation properties and cured to form an outer pipe. The present invention is characterized in that an annular packing that surrounds the outer periphery of the receiving end of the pipe is attached to combine the annular packing with the receiving end of the outer pipe. Furthermore, a fire-resistant two-layer pipe joint structure using the fire-resistant two-layer pipe joint according to the present invention is a two-layer fire-resistant pipe composed of an inner pipe made of synthetic resin and an outer pipe for covering the inner pipe and having fire resistance and heat insulation. In a fire-resistant double-layer pipe joint structure for connecting a straight pipe and a fire-resistant double-layer pipe joint consisting of a synthetic resin inner pipe and a fire-resistant and heat-insulating outer pipe covering the inner pipe, they are connected to each other. The open end of the inner pipe of the straight-line fire-resistant double-layer pipe and the receiving end of the inner pipe of the double-layer fire-resistant pipe joint should be joined together, and the open end of the outer pipe of the straight-line fire-resistant double-layer pipe and the fire-resistant Between the receiving end of the outer pipe of the two-layer pipe joint, an annular packing composed of a non-combustible inorganic fiber heat insulating material that is combined with the receiving end of the outer pipe of the fireproof two-layer pipe joint and surrounds the outer circumference of the inner pipe. It is characterized by being inserted.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fire-resistant double-layer pipe joint according to the present invention, a method of manufacturing the same, and a fire-resistant double-layer pipe joint structure using the same.

FIG. 1 is a cross-sectional explanatory view showing a joint portion for connecting straight pipes 6 and 6 of refractory pipes to each other through a joint 2 of refractory pipes, and FIG. It is sectional explanatory drawing which shows the joined state of the fireproof double-layer pipe straight pipes 6,6.

The refractory double-layered straight pipes 6, 6 are made of synthetic resin such as hard vinyl chloride, and the inner pipes 7, 7 serve as a heat insulating layer and absorb the thermal expansion of the inner pipes 7, 7. There is provided an outer tube 9, 9 such as a fire-resistant and heat-insulating tube having a fire resistance and a heat insulating property, for example, a fiber-reinforced mortar coating tube, which covers the space portion 8, 8 as an air layer to be formed.

On the other hand, the refractory two-layer pipe joint 1 is an inner pipe 2 made of a synthetic resin such as hard vinyl chloride, similar to the straight pipes 6 and 6 of the refractory pipe.
And an outer tube 4 such as a fiber-reinforced mortar cladding tube for covering through a space 3 formed of an air layer, and a receiving end 2 of the inner tube 2.
a, 2a Surrounding the outer circumference, receiving end portions 4a, 4a of outer tube 4.
The inner tube 2 has the annular packings 5 and 5 made of a non-combustible inorganic fiber heat insulating material, and the inner tube 2 has the open end portions 7a and 7a Inner pipes 7, 7 having an inner diameter d that can be fitted and are fitted in the central portion of the inner peripheral surface.
The opening ends 7a, 7a of the inner tube 7 come into contact with each other to form an annular projection 2b for restricting the fitting amount of the inner tubes 7, 7, and the receiving ends 2a, 2a of the inner tube 2 are connected to the receiving ends 4a, 4a of the outer tube 4. It is configured to protrude outwardly from 4a by a dimension a ₁ , for example, approximately 5 to 9 mm, preferably 8 mm.

The annular packings 5 and 5 made of an inorganic fiber heat insulating material have a thickness t which is substantially the same as the receiving end portions 4a and 4a of the outer pipe 4, and the dimension a on the outer circumference of the receiving end portions 2a and 2a of the inner pipe 2.
Inner pipes 7, 7 of straight fired double-layer pipes 6, 6 that overlap only ₁
The joint surfaces 5a, 5a that come into contact with the opening end portions 7a, 7a of the inner pipe 2 are from the receiving end portions 2a, 2a to a2 of the inner tube ₂ , for example, 0 to 6m.
m It is configured to project by about 2 mm.

[0021] The method may, for example, hard socket end 2a of the inner tube 2 of synthetic resin such as vinyl chloride, predetermined dimensions annular packing 5,5 on the outer periphery of 2a a ₁ for producing such a refractory bilayer pipe joint 1 The outer circumference is covered with a mold (not shown) for forming an outer tube which can be divided with a gap.

Next, the inner peripheral surface of the outer tube forming die and the inner tube 2
And a gap surrounded by the annular packings 5,5, is press-filled with a kneaded material such as fiber, cement, and water, which are unhardened outer pipe materials, to expose the inner pipe 2 not covered with the annular packings 5,5. , That is, the outer peripheral surface of the inner tube 2 located between the pair of spaced annular packings 5, and then the outer tube forming mold is divided into unhardened outer tubes. The inner tube 2 covered with the material is taken out of the outer tube forming die.

Subsequently, the inner tube 2 is expanded by heating with hot air, steam, hot water or another method, and the uncured outer tube material covering the outer peripheral surface of the inner tube 2 is expanded by heating. Let it. Then, as the heating time progresses, the outer tube material hardens and the outer tube 4 is formed.

After that, the inner tube 2 made of synthetic resin is reduced in diameter by cooling. Even if the inner pipe 2 is reduced in diameter, the outer pipe 4 does not follow the reduced diameter of the inner pipe 2, the space 3 is formed between the inner pipe 2 and the outer pipe 4, and the receiving end of the outer pipe 4 is formed. Part 4a,
4a, the annular packings 5 and 5 are attached to form a synthesized state,
It becomes the fireproof two-layer pipe fitting 1.

Another manufacturing method of the fire-resistant double-layer pipe joint 1 will be described.
An annular mold is loosely fitted around the outer circumferences of a and 2a, and the outer circumference of the inner pipe 2 is covered with a gap to form an outer pipe forming mold which can be divided in the same manner as described above.

Subsequently, the uncured outer tube material is press-filled into the gap surrounded by the inner tube 2, the annular mold, and the outer tube forming mold as described above, and is covered with the annular mold. The exposed outer peripheral surface of the inner tube 2, that is, the outer peripheral surface of the inner tube 2 located between a pair of annular molds separated from each other is covered with an outer tube material. Subsequently, the outer tube forming mold is divided and the inner tube 2 covered with the uncured outer tube material and provided with the annular mold is removed from the outer tube forming mold.

Subsequently, similarly to the above, the inner tube 2 is expanded by heating, the uncured outer tube material covering the inner tube 2 is expanded and expanded, and the outer tube material is cured to harden the outer tube 4. To form Thereafter, the inner tube 2 is reduced in diameter by cooling to form a space 3 between the inner tube 2 and the outer tube 4.

Next, the annular die is detached from the hardened outer tube 4 and inner tube 2, and the inner tube 2 is removed from the receiving ends 4a of the outer tube 4 by the annular die. The receiving end portions 2a, 2a and the annular packings 5, 5 surrounding the outer circumference are fitted to each other to form the receiving end portions 4a, 4a of the outer tube 4 and the annular packings 5, 5.
And a fire-resistant double-layer pipe joint 1 is obtained. The annular packing 5 may be formed of a plurality of packing members made of an inorganic fiber heat insulating material divided in an arc shape, or may be formed by winding a band made of an inorganic fiber heat insulating material in an annular shape.

In order to join the fire-resistant double-layer pipe straight pipes 6, 6 by the fire-resistant double-layer pipe joint 1 thus constructed, first, the fire-resistant double-layer pipe straight pipes 6, 6 are cut into required lengths. I do. The cutting of the fire-resistant double-layer pipe straight pipes 6, 6 is performed by cutting the inner pipe 7 of the fire-resistant double-layer pipe straight pipe 6 shown in FIG.
The length 2L is twice the length L to be inserted from one of the open ends 9a into the receiving end 2a of the inner pipe 2 of the refractory two-layer pipe joint 1.
3C, the position of the required length B from the opening of the outer tube 9 is connected to the outer tube 9 and the inner tube 7 by a cutting tool such as a metal saw (not shown). Cut at right angles to the axis. After the cutting, as shown in FIG. 3 (d), both ends of the inner pipe 7 have the same dimensions, that is, the refractory double-layer pipe joint 1
By pushing back until the length L to be inserted into the inner tube 2 is reached.

Next, the inner pipes 7, 7 of the refractory double-layer pipes 6, 6
An adhesive is applied to the outer peripheral surfaces of the open ends 7a, 7a, and these open ends 7a, 7a are inserted and fitted into both receiving end portions 2a, 2a of the inner pipe 2 of the fire-resistant double-layer pipe joint 1. Parts 7a, 7a
Is brought into contact with the annular projection 2b to integrate the inner pipe 2 of the fire-resistant double-layer pipe joint 1 with the inner pipes 7, 7 of the fire-resistant double-layer pipe straight pipes 6, 6. Both socket ends 4 of outer tube 4
a, the annular packings 5, 5 synthesized into the outer pipes 4 of the fire-resistant double-layer pipe joint 1 and the opening of the outer pipes 9, 9 of the straight pipes 6, 6 By being interposed between the end portions 9a and 9a while being pressed and compressed, the fire-resistant double-layer pipe straight pipes 6 and 6 are integrally joined via the fire-resistant double-layer pipe joint 1.

According to the fire-resistant double-layer pipe joint structure thus formed, the fire-resistant double-layer pipe straight pipes 6, 6 joined to each other by the fire-resistant double-layer pipe joint 1 are standing pipes, that is, fire-resistant double pipes during construction. The straight pipes 6, 6 are arranged in a vertical relationship with the pipe axes extending in the vertical direction through the two-layer fire-resistant pipe joint 1, and the outer pipes 9, 9 of the two-layer straight pipes 6, 6 are the inner pipe 7, Even when it slides downward with respect to 7 due to its own weight, the receiving end portions 2a, 2a of the inner pipe 2 of the fireproof double-layer pipe joint 1 protrude by the receiving end portions 4a, 4a of the outer pipe 4 by the dimension a ₁ and the annular packing Since the inner pipes 2, 5 are arranged so as to surround the outer periphery of the inner pipes 2, 2, the open end portions 9a, 9a of the outer pipes 9, 9 of the straight tube 6 of the refractory pipe 6, 6 and the receiving end portion 2a of the inner pipe 2 2a are in contact with each other and between the open end portions 9a, 9a of the outer pipes 9, 9 and the receiving end portions 4a, 4a of the outer pipe 4 between the dimension a ₁ . A gap is formed and the annular packing 5 is not excessively compressed, and the receiving end portions 4a, 4
It is possible to prevent the annular packings 5 and 5 from being broken by being crushed by a and the open end portions 9a and 9a of the outer pipes 9 and 9.

Reception end 4 of outer pipe 4 of fire-resistant double-layer pipe joint 1
The specific material of the annular packing 5 to be synthesized with a is, for example, ceramic fiber, and is not used in a fireproof two-layer pipe joint for water supply and drainage for general buildings. When the density is 80 to 350 kg / m ³ and the width dimension a is 2 mm or more, it is possible to sufficiently cope with fire resistance performance, dew prevention performance and workability. m ³ , width dimension a
Is desirably about 6 to 10 mm, and is desirably waterproofed.

After the construction, the solidity or the fixability of the annular packing 5 is increased by applying a fire-resistant material such as a fire-resistant paint to a portion such as the outer periphery of the annular packing 5.
In addition, by eliminating the need for the annular packing 5 itself to have water resistance, the density of the annular packing 5 is reduced to, for example, 80 kg.
/ M ³ made it possible to lower below annular gasket 5
Can be made cheaper.

As the other material of the annular packing 5, rock wool fiber, glass fiber, silica fiber or other non-flammable inorganic fiber heat insulating material can be used. Density 4
0 to 240 kg / m ³ , preferably 80 to 130 kg / m
m ³ approximately, in the case of using the glass fibers and silica fibers, its density 30～120Kg / m ³ approximately, in particular 60
~100kg / m ³ is preferable.

In order to manufacture such an annular packing 5, ceramic fiber, rock wool fiber, glass fiber,
It can be easily and inexpensively obtained by punching out a flat plate material made of a non-combustible inorganic fiber heat insulating material such as silica fiber or by cutting a cylindrical material into an annular shape. Further, the annular packing 5 can be formed by a packing member made of a plurality of arc-shaped inorganic fiber heat insulators divided into arcs, or can be formed by winding a belt-shaped body made of inorganic fiber heat insulators in an annular shape. It is.

The annular packing 5 comprises ceramic fibers,
A plurality of types of inorganic fiber heat insulating materials such as rock wool fiber, glass fiber, and silica fiber may be appropriately mixed and formed.

FIG. 4 is a cross-sectional explanatory view showing another embodiment of the fire-resistant double-layer pipe joint and the fire-resistant double-layer pipe joint structure using the same according to the present invention. Although the detailed description is omitted by attaching, the fire-resistant double-layer pipe joint 10 is a joint for a branch pipe, and the fire-resistant double-layer pipe joint 10 is made of a synthetic resin such as hard vinyl chloride and has a T-shape. Or Y-shaped branched inner tube 11, an outer tube 13 such as a fiber-reinforced mortar coating tube for covering the inner tube 11 through a space portion 12, and receiving end portions 13a, 13a, 13a of the outer tube 13.
End portions 11a, 11a, 1 of inner tube 11 projecting from
1a surrounding the outer periphery of the outer tube 13
3a and 13a, and annular packings 5, 5 and 5 made of an inorganic fiber heat insulating material.

Each end 11a, 11a of the inner pipe 11
At the base end of 11a, a refractory double-layer pipe straight pipe 6, 6, 6
Open ends 7a, 7a, 7a of inner tubes 7, 7, 7 forming
Are formed to form stepped portions 11b, 11b, 11b for regulating the fitting amount of the inner tubes 7, 7, 7, and the receiving end portions 11a, 11a, 11a are formed at the receiving end portion 13 of the outer tube 13.
a, 13a, and is configured to protrude by the dimension a ₁ of 13a.

The annular packings 5, 5, 5 have substantially the same thickness t as the receiving end portions 13a, 13a, 13a of the outer tube 13,
Openings 9a, 9a, 9a of the outer pipes 7, 7, 7 of the straight pipes 6, 6, 6 of the refractory double-layer pipes 6, 6, ₆ are overlapped on the outer circumference of the receiving end portions 11a, 11a, 11a of the inner pipe 11. The joint surfaces 5a, 5a, 5a that come into contact with the receiving end portions 11a, 11a, 1
It is configured to protrude a ₂ from 1a.

In order to connect the fire-resistant double-layer pipe joint 10 to each of the fire-resistant double-layer pipe straight pipes 6, 6, 6, as described above, the fire-resistant double-layer pipe straight pipes 6, 6, 6 cut off as necessary. Open ends 7a, 7 of inner tubes 7, 7, 7 projecting from outer tubes 9, 9, 9 for a predetermined length.
An adhesive is applied to the outer peripheral surfaces of the opening ends 7a and 7a.
a, 7a, 7a are inserted and fitted into receiving end portions 11a, 11a, 11a of the inner pipe 11 of the fire-resistant double-layer pipe joint 10, and the inner pipe 11
And the inner pipes 7, 7, 7 of the refractory double-layer pipe straight pipes 6, 6, 6 are integrated.

Furthermore, the respective receiving end portions 13a, 13 of the outer tube 13
The annular packings 5, 5, 5 synthesized with the a, 13a are connected to the receiving end 13 of the outer pipe 13 forming the fire-resistant double-layered pipe joint 10.
a, 13a, 13a and the open ends 9a, 9a, 9a of the outer pipes 9, 9, 9 forming the respective refractory double-layer pipe straight pipes 6, 6, 6 are interposed in a state of being pressed and compressed. Fire resistant two-layer pipe joint 1
0 and each refractory double-layer pipe straight pipe 6, 6, 6 are integrally connected.

In the embodiment described above, the fire-resistant double-layered pipe joint has been described by taking as an example the joint used when connecting a straight-line or Y-shaped or T-shaped branch of a fire-resistant double-layered pipe. The present invention can be appropriately applied to a fire-resistant double-layer pipe joint of other shapes such as an elbow joint and a cross joint.

[0043]

According to the fire-resistant double-layer pipe joint and the method of manufacturing the same and the fire-resistant double-layer pipe joint structure using the same according to the present invention described above, the fire-resistant double-layer pipe connecting the straight pipes to each other is used. The annular packing, which is made of inorganic fiber heat insulation material at the end of the outer tube of the joint and surrounds the outer periphery of the end of the inner tube, is pre-synthesized. It is interposed between the outer pipe of the joint and the outer pipe of the fire-resistant double-layer pipe and has excellent workability, simplification of the work, and is sufficiently insulated by the annular packing to form dew on the joint treatment part. No fire, no deterioration due to carbonation, no corrosion, no cracks or delamination even after long-term use, and a fire-resistant double-layer pipe joint and a fire-resistant double-layer pipe joint caused by vibration, temperature change, etc. Annular packing follows relative displacement between Joint deformation can be secured for a long period of time in combination with the deformation, and furthermore, since the annular packing is synthesized in advance at the end of the outer pipe receiving end of the fire-resistant double-layer pipe joint used for the joint, Even if the fire-resistant double-layer pipe straight pipe is cut during construction, the annular packing is not removed, and the joint processing function is not deteriorated due to the oversight of the conventional joint processing area. The present invention has an effect peculiar to the present invention, for example, a reliable high-quality refractory double-layer pipe joint can be secured.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view illustrating an embodiment of a fire-resistant double-layer pipe joint, a method of manufacturing the same, and a fire-resistant double-layer pipe joint structure using the same according to the present invention.

FIG. 2 is a cross-sectional explanatory diagram illustrating the embodiment.

FIG. 3 is an explanatory view showing a method for cutting a refractory double-layer pipe according to the present embodiment.

FIG. 4 is a sectional explanatory view showing another embodiment of the present invention.

FIG. 5 is an explanatory cross-sectional view illustrating a conventional fire-resistant double-layer pipe joint structure.

[Explanation of symbols]

 1 Fire-resistant double-layer pipe joint 2 Inner pipe of fire-resistant double-layer pipe joint 2a Receptacle end part of fire-resistant double-layer pipe joint 4 Outer pipe of fire-resistant double-layer pipe joint 4a Receptacle end of fire-resistant double-layer pipe joint 5 Annular Packing 5a Joining surface 6 Fireproof double-layer pipe straight pipe 7 Fireproof double-layer pipe straight inner pipe 7a Fireproof double-layer straight pipe inner pipe opening end 9 Fireproof double-layer straight pipe outer pipe 9a Fireproof double-layer straight pipe Outer end portion of pipe 10 Fire-resistant two-layer pipe joint 11 Inner pipe of fire-resistant two-layer pipe joint 11a Fire-resistant two-layer pipe joint End end of inner pipe 13 Fire-resistant two-layer pipe joint Outer pipe 13a Fire-resistant two-layer pipe joint element and Receptacle end

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[Procedure amendment]

[Submission date] October 14, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Next, the outer pipe 2 of the refractory double-layer pipe straight pipes 21 and 21
The outer pipes 23 of the straight pipes 21, 21 are provided at the contact portions between the open ends 23 a, 23 a of the pipes 3, 23 and the receiving ends 26 a, 26 a of the outer pipe 26 of the fire-resistant double-layer pipe joint 24. A gap is produced due to the manufacturing accuracy of the production of the pipe 23 and the cutting precision thereof, and the outer pipes 23, 23 of the refractory double-layer pipe straight pipes 21, 21 are formed.
And the outer pipe 26 of the fire-resistant double-layer pipe joint 24 is discontinuous, so that a dry-curable joint material 27 mainly made of sodium silicate or cement is stretched in a string shape, and the fire-resistant double-layer pipe straight pipe 21,
Outer end portions 23a, 23a of the outer pipes 23, 23 of 21 and receiving end portions 26a, 26a of the outer pipe 26 of the fireproof two-layer pipe joint 24
Joint processing is performed by a wet joint construction method in which the coating is performed by being wound around the contact portion with the joint.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

The annular packings 5 and 5 made of an inorganic fiber heat insulating material have a thickness t which is substantially the same as the receiving end portions 4a and 4a of the outer pipe 4, and the dimension a on the outer circumference of the receiving end portions 2a and 2a of the inner pipe 2.
Only ₁ superimposed, and the outer tube 9, 9 of the refractory bilayer tube straight pipe 6,6
The joint surfaces 5a, 5a that come into contact with the opening end portions 9a, 9a of the inner pipe 2 are from the receiving end portions 2a, 2a to a2 of the inner tube ₂ , for example, 0 to 6m.
m It is configured to project by about 2 mm.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

The annular packings 5, 5, 5 have substantially the same thickness t as the receiving end portions 13a, 13a, 13a of the outer tube 13,
Receptacle end 11a of the inner tube 11, 11a, superimposed by the dimension a ₁ to 11a periphery, and refractory bilayer tube open end 9a of the outer tube 9,9,9 of straight pipe 6, 6, 6, 9a, 9a The joint surfaces 5a, 5a, 5a that come into contact with the receiving end portions 11a, 11a, 1
It is configured to protrude a ₂ from 1a.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of symbols] 1 Fireproof double-layer pipe joint 2 Inner pipe of fireproof double-layer pipe joint 2a Receptacle end of fireproof double-layer pipe joint 4 Outer pipe of fireproof double-layer pipe joint 4a Fireproof double-layer pipe joint Outer pipe Receptacle end 5 Annular packing 5a Joining surface 6 Fireproof double-layer pipe straight pipe 7 Fireproof double-layer pipe straight inner pipe 7a Inner pipe open end of fireproof double-layer straight pipe 9 Fireproof double-layer straight pipe outer pipe 9a Outer pipe opening end of straight pipe of fireproof double pipe 10 Fireproof two-layer pipe joint 11 Inner pipe of fireproof double-layer pipe joint 11a Receiving end of fireproof double-layer pipe joint Inner pipe 13 Fireproof double-layer pipe joint Outer pipe 13a Fireproof two Layer pipe joint Outer pipe receiving end

Claims (10)

[Claims] 1. An open end of the inner pipe of a straight tube of a fire-resistant double-layer pipe, which comprises an inner pipe made of synthetic resin and an outer pipe having a fire resistance and a heat insulating property, which covers the inner pipe, becomes an end portion of a receiving port. An inner pipe made of synthetic resin to be joined and an open end of the outer pipe of the straight tube of the fireproof double-layer pipe that covers the inner pipe and is joined to the end of the receiving port through the annular packing has fire resistance and heat insulation. In a fire-resistant two-layer pipe joint including an outer pipe, the annular packing is made of a non-combustible inorganic fiber heat insulating material, and the annular packing surrounds the outer periphery of the receiving end portion of the inner pipe of the fire-resistant two-layer pipe joint, and Layered pipe joint A fireproof double layered pipe joint characterized by being synthesized at the receiving end of the outer pipe. 2. The joint surface of the annular packing, which is combined with the receiving end of the outer pipe, with the straight pipe outer pipe opening end projects from the receiving end of the inner pipe to the straight pipe side of the fireproof double-layer pipe to be joined. Claim 1
Fire-resistant double-layer pipe fitting described in. 3. An annular packing comprising a plurality of packing members divided in an arc shape.
Fire-resistant double-layer pipe fitting described in. 4. The fire-resistant double-layer pipe joint according to claim 1, wherein the annular packing is formed by annularly winding a band-shaped body made of an inorganic fiber heat insulating material. 5. An inner pipe made of synthetic resin, an outer pipe having fire resistance and heat insulating properties for covering the inner pipe, a receiving end portion of the outer pipe, and surrounding the outer periphery of the receiving end portion of the inner pipe. In the method for manufacturing a fire-resistant double-layer pipe joint having an annular packing made of a non-combustible inorganic fiber heat insulating material, the annular packing is fitted to the outer periphery of the receiving end portion of the inner pipe, and the exposed outer peripheral surface of the inner pipe is in an uncured state. A method for manufacturing a fire-resistant double-layer pipe joint, which comprises coating with an outer pipe material having fire resistance and heat insulation property, and curing the outer pipe material to form an outer pipe in which an annular packing is synthesized at a receiving end portion. 6. A synthetic resin inner pipe, a fireproof and heat insulating outer pipe covering the inner pipe, a receiving end of the outer pipe, and an outer periphery of the receiving end of the inner pipe. In a method for manufacturing a fire-resistant double-layer pipe joint having an annular packing made of a non-combustible inorganic fiber heat insulating material, an annular die is fitted to the outer periphery of a receiving end portion of the inner pipe, and the exposed outer peripheral surface of the inner pipe is in an uncured state. The outer ring material is coated with an outer tube material having fire resistance and heat insulation property and hardened to form an outer tube, and then the annular mold is detached, and the annular packing that encloses the outer periphery of the receiving end portion of the inner tube in the detachment mark. A method for producing a fire-resistant double-layer pipe joint, characterized in that an annular packing is attached to the outer pipe to attach an annular packing. 7. The method for manufacturing a fire-resistant double-layer pipe joint according to claim 6, wherein the annular packing is composed of a plurality of packing members divided into arc shapes. 8. The method for manufacturing a fire-resistant double-layer pipe joint according to claim 6, wherein the annular packing is formed by annularly winding a band-shaped body made of an inorganic fiber heat insulating material. 9. A straight-line fire-resistant double-layer pipe composed of a synthetic resin inner pipe and an outer pipe having a fire resistance and a heat insulating property for covering the inner pipe, a synthetic resin inner pipe and the inner pipe. In a fire-resistant two-layer pipe joint structure connecting a fire-resistant two-layer pipe joint consisting of an outer pipe having fireproof and heat insulating properties, the open end of the inner pipe of the fire-resistant two-layer pipe straight pipe to be connected to each other While joining the receiving end of the inner pipe of the fire-resistant two-layer pipe joint, between the opening end of the outer pipe of the straight tube of the fire-resistant two-layer pipe and the receiving end of the outer pipe of the fire-resistant two-layer pipe joint, A fire-resistant double-layer pipe joint characterized in that an annular packing made of a non-combustible inorganic fiber heat insulating material that was synthesized in advance on the receiving end of the outer pipe of the fire-resistant double-layer pipe joint and surrounded the inner pipe was used. Fireproof double layer pipe joint structure. 10. A fire-resistant double-layer pipe in which a joint surface of the annular packing with the open end of the straight pipe outer pipe projects from the receiving end of the inner pipe of the fire-resistant double-layer pipe joint to the straight pipe side of the fire-resistant double-layer pipe to be joined. It is combined with the receiving end of the outer pipe of the joint, and is interposed between the opening end and the receiving end of the fireproof two-layer pipe joint while being pressed and compressed by the receiving end of the outer pipe of the joint. A fire-resistant double-layer pipe joint structure using the fire-resistant double-layer pipe joint according to claim 9.