JPH0427437B2 - - 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 fire-resistant composite pipes, only the inner pipes were joined using a synthetic resin adhesive, and the end surfaces of the outer pipes were brought together, and a methane was applied to the outer circumferential surface of the butt joint. There was one that had a fire-retardant effect, but when applying Meji from the outer surface, it was necessary to use an auxiliary tool to maintain that state until the Meji itself had hardened to a certain extent. It takes a lot of time, effort, and expense,
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 aims to omit the construction work without impairing fire resistance.

D. Means for Solving the Problems The present invention fixes a sleeve to the inner side of the outer pipe socket end of a fireproof composite pipe so as to protrude from the end face thereof, and covers the outer surface of the outer pipe spigot of the fireproof composite pipe with the sleeve. That is.

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. A sleeve is fixed to the inner end of the pipe so as to protrude from the end surface thereof, and when the inner pipe socket of one fireproof composite pipe is inserted into the inner pipe socket of the other fireproof composite pipe, the outer circumferential surface of the outer pipe socket is It is a joint structure of fireproof composite pipe covered by a sleeve.

In this case, the inner diameter of the socket of the inorganic coagulated outer tube is approximately the same as or slightly larger than the outer diameter of the spigot 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 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 now attached 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 sleeve used in the present invention is preferably made of metal such as iron or aluminum, but flame-retardant plastic may also be used for outdoor piping.

In order to fix this sleeve to the inner end of the outer pipe socket of the fireproof composite pipe so as to protrude from its side, it is temporarily fixed to the outer peripheral surface of the end of the socket inner pipe of the fireproof composite pipe, and this sleeve is attached as a core type. An outer mold is placed on the outside of the outer mold, and a mixture made of an inorganic coagulant is press-filled into the gap between the outer surface of the inner tube to which the sleeve is temporarily fixed and the outer mold. The tube is formed and the sleeve is permanently fixed.

By forming a conical tapered portion at one end (in this case, the buried side) or both ends of this sleeve, it is possible to firmly fix the sleeve to the outer tube made of inorganic coagulant, and at the same time, it is possible to improve the strength of the sleeve.

In addition, when using a sleeve with conical tapered parts at both ends (see Figure 3), the conical tapered surface on the insertion side guides the spout, making it easy to insert the fireproof composite pipe spout. It can be done.

To explain the connection of the fire-resistant composite pipe of the present invention, when inserting one fire-resistant composite pipe into the other fire-resistant composite pipe, the inner pipe is inserted in advance so that the socket end face of the outer pipe hits the socket end face of the inner pipe. , the length of the outer tube is specified.

Further, the outer surface of the spout of one outer tube is covered by a sleeve fixed to the end of the inner surface 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 socket and the inner peripheral surface of the other inner pipe of the socket, and when the fire-resistant composite pipe socket is inserted into the fire-resistant composite pipe socket, the outer pipe joint The outer surface of the mouth is covered with a sleeve.

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 sleeve, and one end thereof has a protrusion 7 projecting outward.

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 sleeve is fixed to the inner end of the outer pipe socket of the other fireproof composite pipe, and the spout inner pipe is inserted into the inner pipe socket inside the sleeve.

When the spigot is inserted into the socket, the outer circumferential surface of the outer tube spigot is fitted into the sleeve of the outer tube socket.

In this way, the joint structure of the refractory composite pipe is formed.

FIG. 2 is a partially cutaway longitudinal sectional view of the second embodiment;
The same symbols as those shown in the first diagram indicate equivalent parts. 3
4 is a space, and 6 is a conical tapered portion of the sleeve 5.

FIG. 3 is a diagram showing another embodiment of the sleeve shown in FIG. 2. FIG. This example differs from FIG. 2 in that instead of having a tapered sleeve at one end, the sleeve has conical tapered portions at both ends.

F. Effects of the Invention In the joint structure of the fireproof composite pipe of the present invention, it is possible to eliminate the effort and time required for joint construction.

Therefore, the pipe connection work can be done quickly and accurately, and when connecting fire-resistant straight pipes, the piping work does not take much time and construction efficiency is high, so there is no need to use long fire-resistant composite pipes. It is also possible to use it as a unit by combining straight pipes and pipe fittings.

The joint structure of the fire-resistant composite pipe of the present invention uses a sleeve at the connection part to cover the gap, so even if the joint structure of the present invention is exposed to fire, it can maintain sufficient fire resistance. can.

[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 shows another embodiment of the sleeve. 1...Synthetic resin inner tube, 2...Outer tube made of inorganic condensed material, 3...Intermediate layer of synthetic resin foam material, etc., 4...Space, 5...Sleeve, 6...Conical tapered part of sleeve , 7...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 sleeve is fixed to the inner end of the outer pipe socket of the pipe so as to protrude from its end face, and when the inner pipe spout of one fireproof composite pipe is inserted into the inner pipe socket of the other fireproof composite pipe in a state of contact, A joint structure for a fireproof composite pipe, characterized in that an outer circumferential surface of an outer pipe spigot is covered with the sleeve. 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.