JPH0623141Y2 - Fire protection structure for plastic pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fire protection structure in a floor or wall penetration of a plastic pipe such as a plastic conduit having a cable inserted therein.

(Prior Art) Conventionally, as shown in, for example, FIGS. 4a and 4b, a cable 1 is penetrated through a floor or wall 3 such as a fireproof compartment through a plastic conduit tube 2. Conventionally, a metal conduit tube has been used as the plastic conduit tube 2,
Recently, flexible long pipes made of plastic have become popular because of their light weight, corrosion resistance, moldability, and low cost.

A conventional fire protection structure in such a flexible plastic conduit tube 2 uses the plastic conduit tube 2 having a plurality of cables 1 inserted therein, and is passed through a through opening 4 formed in a floor 3, for example. A fireproof sealant layer 5 filled with a fireproof sealant was provided inside the through opening 4 and on both sides of the floor 3.

(Problems to be Solved by the Invention) As described above, the flexible plastic conduit tube 2 is widely used because its characteristics are fully utilized, but it is more heat resistant than the conventional metal conduit tube. There was a lack of fire resistance. For example, as described above, when the plastic conduit tube 2 penetrates the floor or the wall 3 or the like, the fireproof performance is unsatisfactory in the general fireproof body structure using the heat-resistant sealing material. That is, at the time of fire, the plastic conduit tube 2 is easily deformed and starts to burn in sequence. At this time, the inside of the plastic conduit tube 2 usually has a void A of 40 to 60%.
However, smoke or fire on the fire side passes through the gap A to the anti-fire side, and it is difficult to ensure safety in terms of fire prevention.

(Means for Solving Problems) The object of the present invention is to solve the above-mentioned conventional drawbacks, and an opening 4 formed in a wall or floor 3 of a building.
The purpose is to provide a fire protection structure for passing the plastic pipe 2 through.

As a means for achieving such a technical problem, the present invention is to extend a pipe closing member 6 made of a shape memory alloy spring formed into a coil shape at room temperature to extend the plastic pipe 2.
It is characterized in that it is provided so as to surround the outer peripheral portion of.

(Operation) According to the fire protection structure for a plastic pipe of the present invention, the plastic pipe 2 loses its strength due to high temperature during a fire, while the compression action of the pipe closing member 6 made of a shape memory alloy spring formed into a coil shape. , The plastic tube 2 is compressed and deformed, and the internal void A is blocked.
As a result, smoke and flame at the time of fire are prevented from passing through the voids A inside the plastic pipe 2, and the spread of fire is prevented.

(Embodiment) Hereinafter, the fire protection structure of the plastic pipe 2 of the present invention will be further described with reference to an embodiment shown in the accompanying drawings.

1a and 1b show a fire protection structure for a plastic conduit tube 2 according to an embodiment of the present invention.

In the fire protection structure according to this embodiment, a plastic conduit tube 2 is inserted into a through opening 4 formed in a floor or wall 3 of a building, and a fireproof sealing material, for example, a product name of Furukawa Electric Co., Ltd. In order to surround the plastic conduit tube 2 in which the cable 1 is inserted by filling the Dunseal P with the fireproof sealant layer 5 to form a hermetic seal,
A pipe closing member 6 made of a shape memory alloy spring formed into a coil shape is provided which crushes the plastic conduit tube 2 by external pressure to close it. As a concrete example,
When the temperature reaches 100 ° C. or higher, a coil made of a shape memory alloy spring that returns to its original shape is stretched at room temperature and wound around the plastic conduit tube 2. For example, at the time of abnormally high temperature such as a fire, first, the shape memory alloy spring 6 for closing provided on the plastic conduit tube 2 starts to apply an external force to close the plastic conduit tube 2, and then the plastic conduit tube 2 is closed. Becomes a softened state (about 200 ° C.), the blocking action starts, and the blocking is completed before the plastic conduit 2 burns, preventing smoke from burning from passing to the adjacent chamber. As described above, in the present invention, in normal condition, there is no hindrance to the handling of the plastic conduit 2, and the gap between the through opening 4 and the outside of the plastic conduit 2 is filled and formed with the fireproof sealant layer 5, and at the same time, There is an advantage that the closing mechanism portion, that is, the tube closing member 6 is provided at a desired place.

Here, as the fire-resistant sealing material layer 5, a mortar-like material, foamed silicone, an inorganic filler (for example, rock wool, ceramics, etc.), a heat-foaming fire-preventive material, a calcium silicate material and the like commonly used fire-proof Measures can be used. It is not particularly limited.

As the closing mechanism, that is, the tube closing member 6, a shape memory alloy spring formed into a coil shape that can close the plastic conduit tube 2 at high temperature is used. The use of shape memory alloy makes it possible to select a desired closing force with light weight. Also, a desired closing temperature can be selected. Moreover, the blockage becomes even more reliable.

(Effects) In the fire protection structure for a plastic pipe of the present invention, since the pipe closing member 6 made of a coil made of a shape memory alloy is used, it is only necessary to provide it so as to surround the plastic pipe 2 itself. , Construction becomes easy.
Further, since it is an alloy material, stable quality can be maintained without deterioration over a long period of time, and the plastic pipe 2 which is an organic substance is not chemically corroded. further,
Since it reacts sensitively to temperature, it is possible to complete the occlusion in a short time. Moreover, it is possible to set a desired closing force and closing temperature only by changing the composition of the alloy, and it is possible to sufficiently prevent the spread of the fire in the compartment or space.

Further, since the pipe closing member 6 made of a shape memory alloy is formed in a coil shape, the operation amount is greatly expanded, and a sufficient clamping force is given in the radial direction of the plastic pipe 2, so that the plastic pipe 2 is sufficiently crushed. Surely plastic tube 2
Can be blocked.

Further, since the tube closing member 6 made of a shape memory alloy can be deformed by being formed into a coil shape, it can be applied to the plastic tube 2 of any size and shape.
That is, the pipe closing member 6 is provided for each type of the plastic pipe 2.
The fire protection structure of the present invention can be applied to various plastic pipes 2 with one pipe closing member 6 without changing the specifications of.

Further, by being formed into a coil shape, a force for returning the original shape of the tube closing member 6 made of a shape memory alloy spring is applied to the entire circumference of the plastic tube 2 substantially uniformly. As a result, the plastic tube 2 is satisfactorily tightened in the radial direction and quickly and surely crushed. Therefore, according to the fire protection structure of the plastic pipe of the present invention, it is possible to prevent smoke from passing through to the adjacent room at an early stage.

Moreover, in the initial stage of the tube closing action, the tube closing member 6
The point of contact between the plastic tube 2 and the plastic tube 2 is point contact, the force for crushing the plastic tube 2 is concentrated at each contact point, the initial blockage action is accelerated, and the blockage of the plastic tube 2 can be terminated early.

[Brief description of drawings]

FIGS. 1a and 1b are a longitudinal sectional view and a lateral sectional view, respectively, of an embodiment of the present invention, and FIGS. 2a and 2b are the same when heating in an embodiment of the present invention, respectively. And FIG. 3a is a schematic perspective view showing the state of the plastic conduit tube and the tube closing member in the embodiment of the present invention, and FIGS. 3b and 3c are Similarly, FIGS. 4a and 4b are schematic perspective views showing the states of the tube closing member in the embodiment of the present invention at room temperature and at heating, respectively, and FIGS. 4a and 4b are examples of a conventional plastic conduit fire protection structure. FIG. 3 is a vertical cross-sectional view and a horizontal cross-sectional view. 1 ... Cable, 2 ... Plastic (electric wire) pipe 3 ... Floor or wall, 4 ... Through opening 5 ... Fireproof seal material layer 6 ... Pipe closing member (shape memory alloy spring) A ... Plastic pipe Void inside

Claims (1)

[Scope of utility model registration request] 1. A plastic pipe (2) in a penetration portion of a floor or wall (3) in which a fireproof sealant layer (5) is provided in a penetration opening (4) of the floor or wall (3) through which the plastic pipe (2) is inserted. ), The pipe closing member (6) made of a shape memory alloy spring formed in a coil shape is extended at room temperature to surround the outer peripheral portion of the plastic pipe (2). Fire protection structure for plastic pipes.