JP2656726B2 - Joint structure of refractory double-layer pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a fire-resistant double-layer pipe comprising an inner pipe and a fire-resistant outer pipe which covers the inner pipe.

[0002]

2. Description of the Related Art Generally, a fire-resistant double-layer pipe in which an inner pipe made of a synthetic resin such as hard vinyl chloride is covered with a fire-resistant outer pipe, for example, a fiber-reinforced mortar coating pipe, has an inner pipe made of a synthetic resin. Widely used for water supply pipes, drain pipes, ventilation ventilation pipes, distribution pipes, etc. of buildings because the peripheral surface is smooth, excellent in chemical resistance and water resistance, and it is covered with an outer pipe and has excellent fire resistance and heat insulation. It is used.

[0003] The joint structure for connecting the fire-resistant double-layer pipe will be described with reference to FIGS. 4 and 5.

FIG. 4 is a cross-sectional view showing a joint for connecting a pair of refractory double-layer pipes 21 with a pipe joint 24.

[0005] The refractory double-layer pipes 21, 21 are made of synthetic resin, for example, hard vinyl chloride inner pipes 22, 22;
The outer pipes 23 and 23 having fire resistance and heat insulation such as fiber reinforced mortar coated pipes for covering the pipes 2 and 22 and the pipe joints 24 are also made of an inner pipe 25 and an inner pipe made of a synthetic resin such as hard vinyl chloride. 25 has an outer tube 26 made of fiber reinforced mortar or the like having a fire resistance and a heat insulating property. The inner diameter of the inner tube 25 of the pipe joint 24 is the inner tubes 22, 22 of the fire-resistant double-layer tubes 21, 21.
The ends 22a, 22a of the refractory double-layer pipes 21, 21 are fitted with the open end edges 22b, 22b of the inserted refractory double-layer pipes 21, 21 at the central portions of the inner peripheral surfaces thereof. An annular protrusion 25b for determining the fitting depth position is provided.

In order to connect the refractory double-layer pipes 21, 21, the inner pipe 22, which projects outward from the opening edges 23b, 23b of the outer pipes 23, 23 of the refractory double-layer pipes 21, 21 to be connected, 2
2 is coated with an adhesive in advance, and these ends 22a, 22a are respectively inserted and fitted from the opening edges 25a, 25a of the inner pipe 25 of the pipe joint 24, and the fire-resistant double-layer pipe 21,
The outer ends 23b, 23b of the outer tubes 23, 23 are brought into contact with the open ends 26b, 26b of the outer tube 26 of the pipe joint 24 to be connected.

Next, the outer tubes 23, 2 of the refractory double-layer tubes 21, 21
3 is connected to the open ends 26b, 26b of the outer tube 26 of the pipe joint 24 at the contact portion between the open ends 23b, 23b.
Slight gaps occur due to the processing accuracy and the like when cutting the outer tubes 23, 23 of 1, 21. Since the outer tubes 23, 23 and the outer tube 26 are discontinuous, sodium silicate or cement is used. A dry-curable joint material 27 as a main material is stretched in a string shape, and the open edges 23b of the outer tubes 23, 23 of the refractory double-layer tubes 21, 21 and the open edges 26 of the outer tube 26 of the pipe joint 24 are formed.
The joint processing is performed by a wet joint construction method in which the coating is performed so as to be wound around the abutting portion with the b and 26b.

As another joint treatment, a dry joint method shown in FIG. 5 is applied. In this joint method, the same reference numerals are given to portions corresponding to FIG. 4 in FIG. 5, and the detailed description is omitted, but the outer peripheral surface of the outer tube 23 of the fire-resistant double-layer tube 21 and the outer tube 26 of the pipe joint 24 are omitted. A crimping section which is bent in a substantially stepped shape having a bent portion 31a corresponding to a step with respect to the outer peripheral surface and comes into contact with the outer peripheral surface of the outer tube 23 of the refractory double-layer tube 21 and the outer peripheral surface of the outer tube 26 of the pipe joint 24 on both sides. A band-shaped metal joint cover 31 having surfaces 31b and 31c is wound between the outer peripheral surface of the outer tube 23 of the fire-resistant double-layer tube 21 and the outer peripheral surface of the outer tube 26 of the pipe joint 24 and wound. The space is fastened with screws and nuts.

As another joint treatment, as shown in the figure, a flat band-shaped metal joint cover 32 is fitted with a pipe joint such that one side edge 32a covers the outer tube end 23a of the fire-resistant double-layer tube 21. 24 and wound around the end 26a of the outer tube 26,
There is a measure such as filling a gap formed between the end 23a of the outer tube 23 of the refractory double-layer tube 21 and the metal joint cover 32 with a joint filler 33 made of a dry-curable joint material or another non-combustible material. .

[0010]

In the joint treatment by the former wet joint method, the joint material applied to the contact portion between the refractory double-layer pipe and the pipe joint shrinks as it hardens with time,
Cracks and peeling may occur, causing the joint material to fall off. In addition, it may cause deterioration due to carbonation, and may cause problems such as difficulty in securing a function as a joint treatment stable over a long period of time.

On the other hand, in the latter joint processing using a metal joint cover, since the dimensional shape of the joint cover is set in advance, the shape deformation based on an error in the dimensional accuracy in the production of the fire-resistant double-layer pipe, etc. For example, if the cross-sectional shape is deformed into an elliptical shape, etc., it will be difficult to install the joint, and since the joint cover is made of metal, sufficient heat insulation performance will not be obtained especially when used for water supply pipes etc. If the joint cover is corroded and condensed on the joint filler, the joint filler dissolves and this filler flows out. For example, it is difficult to secure a stable joint treatment function over a long period of time. is there.

Further, since these joint treatments are performed after the piping work for the building is completed, the work space is limited,
It is difficult to secure a uniform joint processing function because the work is troublesome,
Further, there is a possibility that the joint processing part may be overlooked. In addition, the construction period will be prolonged, which will lead to an increase in construction costs. There is a possibility that the fireproof double-layer pipe may be damaged due to the relative displacement between the pipe joint and the pipe joint.

Accordingly, an object of the present invention is to secure a joint processing function of high quality which is stable over a long period of time, to simplify the operation and shorten the construction period, and to further reduce the construction cost. An object of the present invention is to provide a joint structure of a two-layer pipe.

[0014]

According to the present invention, there is provided a joint structure for a fire-resistant double-layered pipe, comprising: an inner pipe; and an outer pipe having a fire-resistant and heat-insulating property and covering the inner pipe. In a joint structure of a fire-resistant double-layer pipe for connecting a double-layer pipe and a pipe joint composed of an inner pipe and a fire-resistant and heat-insulating outer pipe that covers the inner pipe, a fire-resistant double-layer pipe to be connected to each other is provided. The inner pipe end and the inner pipe end of the pipe joint are fitted and connected, and the open edge of the outer pipe of the fire-resistant double-layer pipe, and the open end of the outer pipe of the pipe joint facing this open edge. Between fireproof two layers
Outer tube and allow relative displacement between the outer tube vital of the pipe joint, the open end edge of the outer tube of the annular packing refractory bilayer tube made of an inorganic insulation fibers having a non-flammable surrounding the inner tube with the coupling tube
Compression applied by the pipe and the opening edge of the outer pipe of the fitting
It is characterized by being interposed in.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a joint structure of a refractory double-layer pipe according to the present invention.

FIG. 1 shows a pair of refractory double-layer pipes 1 and 1 connected to a pipe joint 5.
FIG. 2 is a cross-sectional view showing a joint part connected to each other through an inner pipe, in which a refractory double-layer pipe 1, 1 is an inner pipe 2, 2 made of a synthetic resin such as hard vinyl chloride; 3, 3, that is, an outer tube 4, 4 such as a fiber-reinforced mortar-coated tube, which is a heat-insulating tube having a fire-resistant and heat-resistant property, which serves as a heat-insulating layer and is covered by an air layer that absorbs thermal expansion of the inner tube. .

A pipe joint 5 for connecting the fire-resistant double-layer pipes 1 and 1 to each other is also an inner pipe 6 made of a synthetic resin such as hard vinyl chloride, like the fire-resistant double-layer pipes 1 and 1 and a space section 7. And an outer tube 8 such as a fiber-reinforced mortar cladding tube for coating through the inner tube 6.
The inner pipe of the refractory double-layer pipes 1, 1 has an inner diameter into which the ends 2a, 2a of the inner pipes 2, 2 of the refractory double-layer pipes 1, 1 can be fitted, and fits into the center of the inner peripheral surface. Annular projections 6b for determining the fitting depth positions of the inner tubes 2, 2 are formed by abutting the opening edges 2b, 2b of the inner tubes 2, 2.

In order to connect the refractory double-layer pipes 1, 1 to be connected to each other via the pipe joint 5, a predetermined length protrudes from each outer pipe 4, 4 of the refractory double-layer pipe 1, 1. FIG. 2 is a diagram showing a structure in which non-combustible inorganic heat-insulating fibers and a small amount of binder are provided at the ends 2a and 2a of the inner tubes 2 and 2 so as to surround the outer periphery thereof.
Is attached with an annular packing 9 shown in a perspective view, and the inner pipe 2,
An adhesive is applied to the outer peripheral surfaces of the ends 2a and 2a of the inner pipe 2 and the ends 2a and 2a of the inner pipe 6 of the pipe joint 5 are opened at both ends.
a, 6a, the opening edges 2b, 2b are brought into contact with the annular projections 6b to integrate the inner tubes 2, 2, and 6, and the annular packing 9 is connected to the outer tube 8 of the pipe joint 5. outer tube of fitting 5 between the both opening edges 8b, 8b and the refractory bilayer tubes 1,1 of each of the outer tube 4, 4 opening edge 4b, 4b of
8 and the outer pipes of the refractory double-layer pipes 1, 1
4, 4 and 4 open end edges 4b, 4b
The refractory double-layer pipes 1 and 1
Therefore, they are connected .

Both open end edges 8b, 8b of the outer tube 8 of the pipe joint 5
The material of the annular packing 9 interposed between the open ends 4b and 4b of the outer pipes 4 and 4 of the fire-resistant double-layer pipes 1 and 1 is ceramic fiber, and is used for general buildings. Water supply,
In the case of a fireproof double-layer pipe for drainage, the density of the annular packing 9 in the non-attached state is 80 to 350 kg.
/ M ³ and a thickness of 2 mm or more can sufficiently cope with fire resistance, dew-proof performance and workability.
Density 220-250Kg /
m ³ and thickness t (FIG. 2) are preferably about 6 to 10 mm,
It is also desirable that a waterproof treatment be performed.

Such an annular packing 9 is interposed and mounted between the open ends 8a, 8a and 4a, 4a of the outer pipe 8 of the pipe joint 5 and the outer pipes 4, 4 of the fire-resistant double-layer pipes 1, 1. In the compressed state, a compressed state of about 1 to 3 mm is preferable.

Further, a fire-resistant paint is applied to a contact portion between the opening edges 8a, 8a of the outer tubes 4, 4 of the fire-resistant double-layer tubes 1, 1 and the annular packing 9 to secure further fire resistance performance and the like. If the smoothness of the opening edges 8a, 8a of the outer tubes 4, 4 is impaired by cutting the refractory double-layer tubes 1, 1, strips of the annular packing are formed in the gaps. , And then applying a refractory paint is effective.

After the application, a material having fire resistance such as a fire-resistant paint is applied to a portion such as an outer periphery of the annular packing 9 so as to enhance the solidity or the fixation of the annular packing 9 and the like.
In addition, by eliminating the need for the annular packing 9 itself to have water resistance, the density of the annular packing 9 is reduced to, for example, 80 kg.
/ M ³ or less, and its price can be reduced.

As the material of the annular packing 9, rock wool fibers, glass fibers, silica fibers and other non-combustible inorganic heat insulating fibers can be used in addition to the above ceramic fibers. When used, the density is 40 to 240 kg / m ³ , desirably about 80 to 130 kg / m ^{3. When} glass fiber and silica fiber are used, the density is 30 to 120 kg.
g / m ³ , particularly preferably 60 to 100 kg / m ³ .

To manufacture such an annular packing 9, ceramic fiber, rock wool fiber, glass fiber,
It can be easily and inexpensively obtained by punching a flat plate made of non-combustible inorganic heat insulating fiber such as silica fiber, or by cutting a cylindrical member into an annular shape.

The annular packing 9 may be formed by two or three or more arcuate arc-shaped packing members, or may be formed in an annular shape having a slit for dimension adjustment. It is also possible. Further, it is also possible to form a cord-like body made of non-combustible inorganic heat insulating fiber by winding it in a ring shape.

Further, the annular packing 9 formed in this way is covered with a rope, preferably a rope made of non-combustible inorganic heat insulating fiber so as to prevent deformation of the annular packing during storage and installation. May be configured.

The annular packing may be formed by appropriately mixing a plurality of types of non-combustible inorganic heat insulating fibers such as ceramic fibers, rock wool fibers, glass fibers, and silica fibers.

FIG. 3 is a sectional view of a main part showing another embodiment of the joint structure of the refractory double-layer pipe according to the present invention. The same reference numerals are given to the portions corresponding to those in FIG. Although omitted, it connects the refractory double-layer pipe 1 and the pipe joint 10 for a branch pipe. The pipe joint 10 is made of an inner pipe 11 made of a synthetic resin such as hard vinyl chloride and the like. Space part 1
Outer tube 13 having fire resistance and heat insulation covering through
The inner pipe 11 has an end 11a having an inner diameter into which the end 2a of the inner pipe 2 of the fire-resistant double-layer pipe 1 can be fitted. The base end of the end portion 11a is brought into contact with the opening edge 2b of the inner tube 2 of the refractory double-layer tube 1 to be fitted, and the step portion 11b for determining the fitting depth position of the inner tube 2 is determined.
Are formed.

In order to connect the refractory double-layer pipe 1 and the pipe joint 10, an annular packing 9 is attached to the end 2a of the inner pipe 2 projecting a predetermined length from the outer pipe 4 of the refractory double-layer pipe 1, as described above. The end 2a having an adhesive applied to the outer peripheral surface is inserted and fitted into the inner pipe 11 of the pipe joint 10 to integrate the two inner pipes 2 and 11, and the annular packing 9 is connected to the fire-resistant double-layer pipe 1 Outer pipe 4 and pipe joint 10
The fireproof two-layer pipe 1 and the pipe joint 10 are integrally connected by being interposed between the respective open end edges 4b and 13b of the outer pipe 13 in a compressed state. Further, if necessary, similar to the above-described embodiment,
A material having fire resistance is applied to a portion such as the outer periphery of the annular packing 9.

In the above embodiment, after the annular packing 9 is attached to the inner pipe 4 of the fire-resistant double-layer pipe 1, the opening edge 4 b of the outer pipe 4 of the fire-resistant double-layer pipe 1 and the outer pipe 8 of the pipe joints 5, 10 are formed. , 13 are interposed between the opening edges 8b, 13b, but the annular packing 9 is prevented from being overlooked by attaching the annular packing 9 to the fire-resistant double-layer pipe 1 or the pipe joints 5, 10 at a factory or the like in advance. It is also possible. The fiber direction of the inorganic heat insulating fiber is not particularly limited. However, in order to secure the resiliency of the annular packing 9 for a long period of time, it is desirable that the inorganic insulating fibers are arranged so that the fiber direction thereof extends mainly along the thickness t direction of the annular packing 9. .

The opening edge 4 of the outer tube 4 of the fire-resistant double-layer tube 1
b and the opening edges 8b of the outer tubes 8, 13 of the pipe joints 5, 10;
13b, if the annular packing 9 to be mounted after the piping due to forgetting to mount or the like, press-fit the above-described plurality of arc-shaped divided packing members or annular packing having slits from the outer periphery, Alternatively, it is possible to easily attach the string-shaped body by winding it into a ring and press-fitting it.In particular, in this case, the fiber direction of the inorganic heat-insulating fibers is arranged radially mainly toward the outer periphery, It is also desirable to coat with a rope-like body in order to ensure the workability.

According to the joint structure of the fire-resistant double-layer pipe described above, the fire-resistant double-layer pipe is connected between the open end of the outer pipe of the fire-resistant double-layer pipe and the open end of the outer pipe of the pipe joint. Joint treatment is performed by interposing the annular packing made of non-combustible inorganic heat insulating fibers surrounding the inner pipe to be jointed. No work space for joint processing is required , compared to the joint processing work of covering with the mounting or joint cover of
In addition, joint processing is performed simply by incorporating a separately manufactured annular packing, simplifying the work, greatly shortening the construction period, obtaining the annular packing at low cost, and simplifying the structure. In addition, a reduction in construction costs can be ensured. In addition, since the annular packing is formed by the inorganic heat insulating fiber, it is sufficiently insulated without causing condensation at the joint treatment part, and is deteriorated by carbonation, corroded, contracted, cracked, and peeled due to aging curing such as a dry-cured joint material. In the state where compression is applied following the deformation of the refractory double-layer pipe and the pipe joint and the relative displacement between the refractory double-layer pipe and the pipe joint caused by vibration, temperature change, etc. Since the interposed annular packing is deformed, the joint packing function can be maintained for a long period of time.

Further, since the annular packing can be separately manufactured at a factory or the like, and the annular packing can be attached to the fire-resistant double-layer pipe or the pipe joint in advance, it is possible to avoid overlooking the attachment point of the annular packing. The present invention has effects unique to the present invention, such as easy management of quality and wide application to a joint of a fire-resistant double-layer pipe.

[0034]

According to the above-described joint structure for a fire-resistant double-layer pipe of the present invention, the fire-resistant double-layer pipe to be connected to each other and the open end of the outer pipe of each pipe joint have nonflammability. Since the annular packing made of inorganic heat-insulating fibers is interposed in a compressed state to perform joint treatment, joint treatment is performed simultaneously with the piping, and its workability is excellent, work is simplified, and the It can be expected to significantly reduce the cost and construction cost.It is fully insulated by the annular packing and does not condense on the joint treatment part, and it does not cause deterioration, corrosion, or cracking or peeling due to carbonation due to long-term use. In addition, the annular packing deforms following the relative displacement between the refractory double-layer pipe and the pipe joint caused by vibration, temperature change, etc., so that a stable joint treatment function can be secured for a long period of time. Has the effects unique to the present invention, such as .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a joint structure of a refractory two-layer pipe according to the present invention.

FIG. 2 is a perspective view of an annular packing used in the present embodiment.

FIG. 3 is a cross-sectional view showing another embodiment of the joint structure of the refractory double-layer pipe according to the present invention.

FIG. 4 is a cross-sectional view illustrating a joint structure of a conventional fire-resistant double-layer pipe.

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

[Explanation of symbols]

 1 {fireproof double-layer pipe 2} inner pipe 2a {end 4} outer pipe 4a {end 4b} open edge 5} pipe joint 6} inner pipe 6a ‥ End 8 ‥‥‥ Outer pipe 8a ‥‥ End 8b ‥‥ Opening edge 9 ‥‥‥ Circular packing 10 ‥‥ Piping joint 11 ‥‥ Inner pipe 11a ‥ End 13 ‥‥ Outer pipe 13a ‥ End 13b ‥ Opening edge

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Sakamaki 2-12-10 Shibadaimon, Minato-ku, Tokyo Inside Asano Slate Co., Ltd. (56) References Shiroko 22-22151 (JP, Y2) −12952 (JP, Y2)

Claims (13)

(57) [Claims] 1. A fire-resistant double-layer pipe comprising an inner pipe and a fire-resistant and heat-insulating outer pipe covering the inner pipe, and a fire-resistant and heat-insulating outer pipe covering the inner pipe and the inner pipe. In the joint structure of a fire-resistant double-layer pipe that connects
The inner pipe end of the refractory double-layer pipe to be connected to the inner pipe end of the pipe joint is fitted and connected, and the open edge of the outer pipe of the refractory double-layer pipe and the pipe facing the open edge The phase between the outer pipe of the refractory double-layer pipe and the outer pipe of the pipe joint between the open end of the outer pipe of the fitting
The annular packing made of non-combustible inorganic heat insulating fiber that allows the pair displacement and surrounds the joined inner pipe is fire resistant.
Between the open edge of the outer pipe of the double-layer pipe and the open edge of the outer pipe of the fitting
Therefore, the joint structure of the refractory double-layer pipe is interposed in a state where compression is applied . 2. The fire-resistant double-layer pipe according to claim 1, wherein each inner pipe of the fire-resistant double-layer pipe and the pipe joint is a pipe made of a synthetic resin, and each outer pipe is a fiber-reinforced mortar clad pipe. Joint structure. 3. An annular packing comprising a plurality of packing members divided in an arc shape.
The joint structure of the refractory double-layer pipe according to item 1. 4. The joint structure according to claim 1, wherein the annular packing has a slit. 5. The annular packing is formed by winding a string made of a non-flammable inorganic heat insulating fiber.
Or the joint structure of the fire-resistant double-layer pipe according to 2. 6. The joint structure for a fire-resistant double-layer pipe according to claim 1, wherein the annular packing is covered with a rope. 7. The joint structure for a fire-resistant double-layer pipe according to claim 1, wherein the annular packing is waterproofed. 8. The joint structure for a fire-resistant double-layer pipe according to claim 1, wherein the annular packing portion is coated with a water-resistant fire-resistant material. 9. The joint structure according to claim 1, wherein the annular packing is made of ceramic fibers. 10. The joint structure according to claim 1, wherein the annular packing is made of glass fiber. 11. The joint structure according to claim 1, wherein the annular packing is made of rock wool fibers. 12. The joint structure according to claim 1, wherein the annular packing is made of silica fiber. 13. The joint structure for a fire-resistant double-layer pipe according to claim 1, wherein the annular packing is made of a plurality of types of non-flammable inorganic heat insulating fibers.