JPH0123024Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention covers the outer circumferential surface of a synthetic resin pipe with a fireproof layer such as asbestos or mortar, so that the inner synthetic resin pipe will melt in the event of a fire, etc. This invention relates to a fireproof pipe connection device that prevents it from disappearing.

(Prior art) When synthetic resin pipes are used for water supply, drainage, etc. piping lines in high-rise housing, the synthetic resin pipes melt and disappear due to fire, etc., and the lost pipe passages become chimneys. , which may even cause a fire on the upper floors. For this reason, in recent years, fire-resistant pipes in which the outer circumferential surface of a synthetic resin pipe is coated with a fire-resistant layer of asbestos, mortar, etc. have been used in the piping lines of high-rise residential buildings. A pipe joint has been proposed in which the end of one fireproof pipe is inserted into the socket of the other fireproof pipe.

(Problem to be solved by the invention) However, since the pipe joint proposed in the above publication cannot absorb the thermal expansion of the outer fireproof layer, there is a risk of secondary disaster occurring in the event of a fire, etc. Ta. That is, when a fire occurs, the outer fireproof layer thermally expands, and when the end face of the fireproof layer comes into pressure contact with the end face of the socket and breaks, the exposed inner synthetic resin pipe melts.
There was a danger that the extinguished fire could spread to the upper floors.

The present invention solves these problems and is a fire-resistant pipe that absorbs the thermal expansion of the outer fire-resistant layer and prevents damage to the pipe in the event of a fire, thereby preventing secondary disasters. It provides a connection device.

(Means for Solving the Problems) The connecting device of the present invention includes a fireproof pipe whose outer circumferential surface of a synthetic resin pipe is coated with a fireproof layer, and a synthetic resin joint having a socket whose outer circumferential surface is coated with a fireproof layer. It consists of a fireproof joint in which a cylindrical covering part is formed by a fireproof layer extending from the edge of the joint.

The present invention exposes the end of the synthetic resin pipe from the edge of the fireproof pipe and inserts it into the socket of the fireproof joint,
The present invention is characterized in that a buffer is interposed between the end face of the fireproof layer and the end face of the joint, and the end of the fireproof layer is fitted and connected within the cylindrical covering part.

(Function) As mentioned above, the end of the fireproof pipe is inserted into the socket of the fireproof joint, and since a buffer is interposed between the end face of the fireproof layer and the end face of the joint, the outer fireproof layer Thermal expansion of is absorbed by the buffer.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a half-sectional view showing one embodiment of the present invention, and FIG. 2 is a half-sectional view of main parts showing another embodiment,
In the figure, reference numeral 1 is a fireproof pipe, 2 is a fireproof joint, and 3 is a buffer material such as rubber or putty.

The fireproof pipe 1 is constructed by covering the outer peripheral surface of a pipe 11 made of vinyl chloride resin, polyethylene resin, or other suitable thermoplastic synthetic resin with a fireproof layer 12. This fireproof pipe 1 is a synthetic resin pipe 11
This can be obtained by winding and fixing a flat plate-shaped refractory layer 12 around the outer circumference of the synthetic resin pipe 11 or by molding, but a small gap is provided between the outer circumference of the synthetic resin pipe 11 and the refractory layer 12. By providing a minute gap between them in this manner, thermal expansion of the tube in the axial and radial directions is absorbed by this minute gap, thereby preventing damage to the tube.

On the other hand, the fireproof joint 2 is a joint 21 made of the same type of synthetic resin as the synthetic resin pipe 11 of the fireproof pipe 1, and the outer peripheral surface of the joint 21 is covered with a fireproof layer 22. Fitting 2
Expanded diameter sockets 211 are provided at both ends of the fireproof pipe 1, into which the synthetic resin pipe 11 of the fireproof pipe 1 can be inserted and connected. Although an adhesive type socket is illustrated in FIG. 1, the enlarged diameter socket 211 can also be used as a rubber ring type socket for elastically connecting a synthetic resin pipe via a rubber ring, as illustrated in FIG. good.

Further, a cylindrical covering part 221 extending from the fireproof layer 22 is formed at the edge of the socket 211,
The end portion of the fireproof layer 12 of the fireproof pipe 1 can be fitted into the covering portion 221.

Further, the fireproof layers 12 and 22 used in the present invention include asbestos, a mixture of concrete and inorganic fibers, but other materials such as appropriate fiber-reinforced mortar having fire resistance can also be used.

Next, a procedure for connecting fireproof pipes using the device of the present invention will be explained. First, one end of the synthetic resin pipe 11 is exposed by a predetermined length from one end of the fireproof pipe 1, and the buffer body 3 is attached to the outer periphery of the synthetic resin pipe 11. Next, connect one end of the synthetic resin pipe 11 to the socket 211.
At the same time, the end of the fireproof layer 12 is inserted into the cylindrical covering part 221, and the end face of the fireproof layer 12 and the joint 2
A buffer body 3 is interposed between the end face of 1 and the end face of 1.

The piping construction is thus completed, but in this construction procedure, when connecting the synthetic resin pipe 11 to the adhesive type socket 211 shown in FIG.
After applying an adhesive to the outer periphery of the end of 1, this is inserted into the socket 211. A sealing material such as putty may be interposed between the inner surface of the cylindrical covering portion 221 and the outer surface of the fireproof layer 12 as necessary.

Although a socket joint is shown in FIG. 1 and an elbow joint is shown in FIG. 2 as an embodiment of the present invention, the present invention can also be applied to T-joints, end caps, and various other joints.

(Effects of the Invention) As described above in detail, the connection device of the present invention can be connected by simply inserting the end of the fireproof pipe into the socket of the fireproof joint, so piping construction is extremely simple.
Also, by this connection operation, the inner synthetic resin pipe,
The synthetic resin joint is completely covered with the fireproof layer, and the thermal expansion of the outer fireproof layer is absorbed by the buffer, so the outer fireproof layer will not expand thermally in the event of a fire, etc. The fireproof layer covering the outside of the synthetic resin pipe will not be damaged.

Therefore, by using the connecting device of the present invention, it is possible to prevent a secondary disaster in which a fire spreads to the upper floors due to the chimney effect caused by a broken pipe.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing one embodiment of the present invention, and FIG. 2 is a half-sectional view of essential parts showing another embodiment of the present invention. 1...Fireproof pipe, 11...Synthetic resin pipe, 12
... Fireproof layer, 2 ... Fireproof joint, 21 ... Synthetic resin joint, 211 ... Diameter expansion socket, 22 ... Fireproof layer,
221...Cylindrical covering part, 3...Buffer body.

Claims (1)

[Scope of utility model registration request] A fireproof pipe 1 in which the outer peripheral surface of a synthetic resin pipe 11 is covered with a fireproof layer 12, and a fireproof pipe 1 in which the outer peripheral surface of a synthetic resin joint 21 having a socket 211 is covered with a fireproof layer 22, and a fireproof pipe extending from the edge of the joint 21. The end of the synthetic resin pipe 11 exposed from the edge of the fireproof pipe 1 is inserted into the socket 211 of the fireproof joint 2, and the fireproof A buffer body 3 is provided between the end face of the layer 12 and the end face of the joint 21.
A fire-resistant pipe connecting device characterized in that an end portion of a fire-resistant layer 12 is fitted and connected within a cylindrical covering portion 221.