JPS6148039B2 - - Google Patents

Description

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

Conventionally, when connecting fire-resistant composite pipes, only the inner pipes were joined using a synthetic resin adhesive, and the outer pipes were made by butting the ends of the outer pipes against each other, and applying a medicinal agent to the outer circumferential surface of the butted seam. However, when applying this method from the outer circumferential surface, it is necessary to use an auxiliary tool to maintain the condition until the Meji itself has hardened to a certain extent, so it takes a long time to apply the Meji. It tends to take a lot of time, effort, and cost,
In addition, during construction, the viscosity of the medicinal agent required that it be hard-mixed to prevent it from running off, and when using a soft medicinal agent, it was necessary to surround it with an iron ring.

The present invention overcomes these conventional drawbacks.

Next, the present invention will be explained with reference to the accompanying drawings. 1st
The figure is a partially cutaway longitudinal sectional view of the first embodiment of the fireproof composite pipe of the present invention, and FIG. 2 is a partially cutaway longitudinal sectional view of the second embodiment.

3 and 4 are diagrams for explaining a jig used when manufacturing a pipe joint similar to that of the first embodiment. In FIGS. 1 and 2, 1 is an inner tube of synthetic resin, and 2 is an outer tube made of an inorganic coagulant, for example, made of asbestos, cement, and water.

Glass fiber or rock wool may be used in place of or in combination with asbestos.

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

The inner diameter of the socket of this inorganic coagulated outer tube 2 is approximately equal to or slightly larger than the outer diameter of the spigot of the other outer tube 2.

3 is a medicinal agent consisting of asbestos, cement, a water-soluble admixture, and water, and methyl cellulose or polyvinyl alcohol is used as the water-soluble admixture.

Reference numeral 4 denotes an intermediate layer such as a synthetic resin foam material interposed between the synthetic resin inner tube 1 and the inorganic condensed material outer tube 2, and is adhered to the synthetic resin inner tube 1 with a synthetic resin adhesive. There is. And with this foam middle layer,
Absorbs expansion and contraction of the inner tube.

In this case, as shown in the first figure, when the expansion and contraction of the inner tube is small, the intermediate layer such as a synthetic resin foam material can be omitted.

4' is a space formed by an intervening member between the inner tube 1 and the outer tube 2, but it does not need to be provided when the expansion and contraction of the inner tube is small.

Next, a method of manufacturing an outer tube having a socket is shown in FIGS. 3 and 4. A jig 5 having a specified thickness and diameter is inserted into each opening of the synthetic resin inner tube, and this jig 5 is
The outer peripheral surface of the tube is also coated with an inorganic coagulant in the same way as the synthetic resin inner tube. After curing and semi-hardening, the jig is pulled out in the direction of the arrow in FIG. 4, removed and completely cured, resulting in a product with an outer tube that is longer than the inner tube by the length of the jig.

Note that if a large number of jigs are prepared, the jigs may be removed from the product after it is completely cured.

In addition, the pipe joint of the synthetic resin inner pipe is given the role of a core mold, an outer mold is placed on the outside of the joint, and a mixture made of an inorganic coagulant is press-filled into the gap between the inner pipe and the outer mold. It may be manufactured by

Also, to explain the method for constructing the joint structure of the fire-resistant composite pipe of the present invention, as shown in Figs. 1 and 2, when inserting one fire-resistant composite pipe into the other fire-resistant composite pipe,
The lengths of the inner and outer tubes are determined in advance so that the spout end surface of the outer tube abuts the socket end surface of the inner tube.

Further, the outer surface of the spout of one outer tube is overlapped with the inner surface of the socket of the other outer tube so as to form a gap.

Before inserting the fireproof composite pipe, apply adhesive to the outer circumferential surface of the spout of the inner tube and the inner circumferential surface of the socket of the other inner tube, and apply adhesive to the outer circumferential surface of the spout of the outer tube and/or the socket of the outer tube. By applying a thin layer of meji agent to the inner circumferential surface of the blade and then inserting it, you can easily and accurately apply meji in a short time.

Of course, it is also possible to fill the medicinal agent into the formed gap later.

In this construction, there is no need to consider auxiliary tools as in the past, and the meji agent is securely held within the gap, which previously required a skilled worker, but it can be done even by an amateur without the need for a skilled worker. . And the time required for meji construction is approximately one-tenth of the conventional method. Since the present invention has the above configuration, it has the following effects.

When applying the joint structure of the fireproof composite pipe of the present invention, all you need to do is apply a thin layer of adhesive to the outer circumferential surface of the socket and/or the inner circumferential surface of the socket of the outer pipe, and there is no need to trim it with a trowel as in the conventional method. The construction efficiency is very good.

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 straight pipes and pipe fittings and use them as a unit.

The joint structure of the fire-resistant composite pipe of the present invention is formed by a double outer pipe, and the gap is filled with medicinal agent, so that even if the joint structure is exposed to flame in the event of a fire, sufficient fire resistance can be maintained. I can do it.

[Brief explanation of the drawing]

Figures 1 and 2 are partially cutaway longitudinal cross-sectional views of the joint structure of the fireproof composite pipe of the present invention, and Figures 3 and 4 are explanations of jigs used when manufacturing the pipe joints shown in Figures 1 and 2. This is a diagram for

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 inner pipe socket of one fire-resistant composite pipe is inserted into the inner pipe socket of the other fire-resistant composite pipe. Insert the outer pipe socket end face of one fireproof composite pipe until it hits the inner pipe socket end face of the other fireproof composite pipe, creating a gap between the outer circumferential surface of the outer pipe socket and the inner circumferential surface of the outer pipe socket. At the same time, attach a screw to the outer peripheral surface of the socket of the outer pipe of one fire-resistant composite pipe and/or the inner peripheral surface of the outer pipe socket of the other fire-resistant composite pipe. A joint structure for a fire-resistant composite pipe characterized by filling and holding the gap between the pipe and the inner peripheral surface of the socket. 2. In the joint structure for a fire-resistant composite pipe according to claim 1, 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.