JPH0427436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a joint structure for a fire-resistant composite pipe with excellent fire resistance.

B. Conventional technology Conventionally, to connect fireproof composite pipes, only the inner pipe was joined with a synthetic resin adhesive, and the end surfaces of the outer pipe were butted against each other, and a medicinal agent was applied to the outer circumferential surface of the butt joint. However, when applying the meji from the outer circumferential surface, it is necessary to use an auxiliary tool to maintain the condition until the meji itself hardens to a certain extent, so it is difficult to apply It takes time, effort, and costs,
Also, during construction, the viscosity of the medicinal agent had to be hardened so that it would not run off.

C. Problems to be Solved by the Invention The present invention eliminates the conventional drawbacks in which the medicinal agent applied to the outer surface of the outer pipe of a fireproof composite pipe cracks, breaks, and falls off due to a light impact, and also improves the ability to apply The purpose is to reduce the amount of medicinal agent required without impairing fire resistance and to simplify and facilitate the construction of medicinal agents.

D. Means for Solving the Problems In order to solve the drawback of insufficient strength of the medicinal agent installed by the conventional method, the present invention fixes a reducing socket inside the outer pipe socket end of the fireproof composite pipe. , the annular space between the outer surface of the outer pipe spigot of the fireproof composite pipe and the inner circumferential surface of the retarded socket is filled with medicinal agent.

The present invention provides a joint structure for fire-resistant composite pipes consisting of a synthetic resin inner pipe and an outer pipe made of an inorganic condensed material, in which the spout inner pipe of one fire-resistant composite pipe protrudes from the spout outer pipe, and the outer pipe holder of the other fire-resistant composite pipe is made to protrude from the spout outer pipe. When a reducing socket is fixed to the inner end of the mouth and the inner pipe spigot of one fireproof composite pipe is inserted into the inner pipe socket of the other fireproof composite pipe in abutting manner, the outer peripheral surface of the outer pipe spigot and the outer This is a joint structure for a fire-resistant composite pipe in which an annular space is formed between the inner circumferential surfaces of the retarded sockets of the pipe socket, and meji is filled and held in the annular space.

In this case, the inner diameter of the socket of the outer tube made of inorganic coagulant is slightly larger than the outer diameter of the socket of the other outer tube.

The outer tube made of the inorganic coagulant is made of, for example, asbestos, cement, and water.

Furthermore, glass fiber or rock wool may be used in place of or in combination with asbestos.

Furthermore, a filler such as silica sand may be used if necessary.

The medicinal agent used in the present invention consists of asbestos, cement, a water-soluble admixture, and water, and the water-soluble admixture includes methyl cellulose or polyvinyl alcohol.

The intermediate layer, such as a synthetic resin foam material, that is interposed between the synthetic resin inner pipe of a pipe joint and the inorganic condensed material outer pipe is adhered to the synthetic resin inner pipe using a synthetic resin adhesive. This intermediate layer absorbs expansion and contraction of the inner tube.

In this case, when the expansion and contraction of the inner tube is small, the intermediate layer such as a synthetic resin foam material can be omitted. The space formed by an intervening member (not shown) between the straight synthetic resin inner tube and the inorganic condensed material outer tube can be omitted when the inner tube expands and contracts only slightly.

The reducing socket used in the present invention is preferably made of metal such as iron or aluminum, but in the case of outdoor piping, flame-retardant plastic may also be used. Further, although the inner diameter of the socket with different diameters forms a conical tapered portion as shown in FIG. 3, the inner diameter may be the same diameter as shown in FIG.

In order to fix this reducing socket to the inner end of the outer pipe socket of the fireproof composite pipe, it is temporarily fixed to the outer peripheral surface of the end of the socket inner pipe of the fireproof composite pipe, and this socket is used as a core type. , an outer mold is placed on the outside, and a mixture consisting of an inorganic coagulating material is press-filled into the space between the outer surface of the inner tube and the outer mold, to which the small diameter part of the reducing socket is temporarily fixed, to form an inorganic coagulant. While manufacturing the outer pipe made of wood, the reducing socket is permanently fixed.

One end of the reciprocating socket (in this case, the buried side)
Alternatively, by forming conical tapered portions at both ends, it is possible to strengthen the fixation with the outer tube made of inorganic coagulated material, and at the same time, it is possible to improve the strength of the reducing socket.

Further, it is also possible to form an outwardly projecting protrusion on the small diameter portion of the reciprocating socket by pressing, so as to strengthen the fixation with the outer tube.

To explain the construction method for the joint structure of the fireproof composite pipe of the present invention, when inserting one fireproof composite pipe into the other fireproof composite pipe, the socket end face of the outer pipe abuts against the socket end face of the inner pipe. The lengths of the inner and outer tubes are determined in advance.

Further, an annular gap is formed between the outer surface of the spigot of one outer tube and the reducing socket fixed to the inner end of the socket of the other outer tube.

Before connecting the fire-resistant composite pipe, apply adhesive to the outer circumferential surface of the inner pipe of the spigot and the inner circumferential surface of the other inner pipe of the socket, insert the fire-resistant composite pipe spigot into the fire-resistant composite pipe socket, and connect the outer pipe to the outside of the outer pipe spigot. The annular space between the side surface and the socket with a different diameter is filled with medicine.

If the annular gap is extremely small, it is extremely difficult to fill with meji, and since there is no problem in terms of fire prevention and fireproofing, the meji construction can be omitted.

E Example Fig. 1 shows the first joint structure of the fireproof composite pipe of the present invention.
This is a partially cutaway vertical sectional view of an embodiment, in which 1 is a synthetic resin inner tube, and 2 is an outer tube made of an inorganic coagulant. Reference numeral 5 denotes a socket with a different diameter, and the smaller diameter portion thereof has a protrusion 8 projecting outward. 7 is medicinal drug.

To connect the refractory composite pipes, the inner pipe of one of the refractory composite pipes is made to protrude from the outer pipe, and the inner pipe is inserted into the inner pipe of the socket.

A reducing socket is fixed to the inner end of the outer pipe socket of the other fireproof composite pipe, and the spigot inner pipe is inserted into the inner pipe socket inside the socket.

When the spigot is inserted into the receptacle, a gap is formed between the outer circumferential surface of the outer tube spigot and the inner circumferential surface of the retarded socket of the outer tube receptacle, and the medicine is filled in this gap. In this way, the joint structure of the refractory composite pipe is formed.

FIG. 2 is a partially cutaway sectional view of the second embodiment, and the same symbols as those shown in the first diagram indicate equivalent parts. 3 is an intermediate layer such as a synthetic resin foam, 4 is a space, and 6 is a conical tapered portion of the socket. Figure 3 is the second
FIG. 7 is a diagram showing another embodiment of the illustrated reducing socket; This example differs from FIG. 2 in that it uses a tapered socket instead of a reciprocating socket.

F. Effects of the Invention In the joint structure of the fire-resistant composite pipe of the present invention, there is no need to consider the use of auxiliary tools, etc., as in the past, and only a very small amount of the meji agent is required for the meji construction. Since it is securely held within the annular space, it does not require a skilled worker and can be done even by an amateur.

In addition, the labor and time required for meji construction can be halved.

Pipe connection work can be done quickly and accurately, and when connecting fire-resistant straight pipes, the piping work is hassle-free and construction efficiency is high, so there is no need to use long fire-resistant composite pipes. It is also possible to combine pipes and pipe fittings and use them as a unit. The joint structure of the fireproof composite pipe of the present invention uses a socket with a different diameter for the connection part, and the space between the two is filled with a medicinal agent.
Even if the joint structure of the present invention is exposed to a fire, sufficient fire resistance can be maintained. Further, the conical tapered portion of the retarded socket has the advantage that the refractory composite pipe spigot can be easily inserted.

[Brief explanation of drawings]

1 and 2 are partially cut away vertical cross-sectional views of the joint structure of the fireproof composite pipe of the present invention. FIG. 3 is a diagram showing another embodiment of the reducing socket. 1...Synthetic resin inner tube, 2...Outer tube made of inorganic coagulated material, 3...Intermediate layer of synthetic resin foam material, etc., 4...Space, 5...Reducing diameter socket, 6...Conical shape of socket Tapered part, 7... Medicinal agent, 8... Protrusion.

Claims (1)

[Scope of Claims] 1. In a joint structure for a fire-resistant composite pipe consisting of a synthetic resin inner pipe and an inorganic coagulated outer pipe, the spout inner pipe of one fire-resistant composite pipe protrudes from the spout outer pipe, and the spout inner pipe of one fire-resistant composite pipe protrudes from the spout outer pipe, and A reducing socket is fixed to the inner end of the outer pipe socket, and when the inner pipe socket of one fire-resistant composite pipe is inserted into the inner pipe socket of the other fire-resistant composite pipe in abutting manner, the outer pipe socket A joint for a fire-resistant composite pipe, characterized in that an annular gap is formed between the outer circumferential surface and the inner circumferential surface of the retarded socket of the outer tube socket, and the annular gap is filled and held with meji. structure. 2. In the joint structure for a fire-resistant composite pipe described in claim 1, it is noted that the fire-resistant composite pipe has an intermediate layer such as a foamed material interposed between the synthetic resin inner pipe and the inorganic coagulated outer pipe. Features a fire-resistant composite pipe joint structure.