JPH0321171Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a case for a cable connection part used to protect a connection part of a cable.

[Prior Art] As shown in FIGS. 3 and 4, the connecting portion 2 of the two cables 1, 1 is generally
A cylindrical cable connection part case (hereinafter abbreviated as connection part case) 3 is provided to cover the cable connection part case from the periphery. This connection case 3 is connected to the above cable 1,
A pair of half bodies 4, 4 made of fiber-reinforced plastic such as fiber-reinforced polypropylene, which face each other with 1 in between, are joined together by bolts 5 and nuts 6. and,
The openings at both ends of the connection case 3 through which the cables 1, 1 are inserted are fitted with end plates 7, 7 for closing these openings, respectively.

By the way, among such connection case 3,
In particular, connection cases used for connection parts of cables installed in enclosed spaces, such as underground cables, do not contain halogens to prevent the generation of toxic gases in the event of a fire. It is necessary to use one made of flame-retardant fiber-reinforced plastic. For this reason, this type of connection case 3 has conventionally been made of flame-retardant fiber-reinforced plastics to which an inorganic substance such as magnesium hydroxide is added instead of halogen as a flame retardant.

[Problems to be solved by the invention] However, in the case of the conventional connection case 3, when a large amount of the above-mentioned inorganic substance is added to obtain sufficient flame retardance, the amount of plastics is relatively reduced. , which has the disadvantage that its airtightness deteriorates. For this reason, it is unsuitable for use as a connection case in locations where it is necessary to maintain airtightness around the cable connection, such as cables where compressed air or compressed nitrogen gas is sealed inside the cable and gas maintenance is performed. There was a problem.

[Purpose of the invention] This invention was made in view of the above circumstances.
The object of the present invention is to provide a connection case that has excellent airtightness and flame retardancy, and is free from the risk of generating toxic gas even if it burns.

[Means for solving the problem] The connection case of this invention is made of flame-retardant fiber-reinforced plastic that does not contain halogen, and gas is less likely to permeate through the middle or inner circumferential portion of the main body than in the above-mentioned main body. A non-air permeable layer is formed.

[Function] The connection case with the above structure has flame retardance due to the halogen-free flame-retardant fiber-reinforced plastic that forms the main body, and also prevents the generation of toxic gas in the event of a fire. be done. Also,
The air-impermeable layer provides internal airtightness.

[Example] Fig. 1 shows an example of a connecting part case of this invention, and reference numeral 10 in the figure is the connecting part case.

This connection case 10 has a substantially cylindrical appearance, and a pair of half bodies 11, 11 facing each other with the cable 1 in between are bolts and nuts (not shown).
It is constructed by being combined and integrated.
Here, the main bodies 12, 12 of the half bodies 11, 11 constituting the connection case 10 are each molded from fiber-reinforced plastic to which an inorganic substance such as magnesium hydroxide is added instead of halogen as a flame retardant. has been done. And this half body 11
The inner periphery of the main body 12 is made of polypropylene (PP).
or synthetic resins such as polyethylene (PE) or polyvinyl chloride (PVC), or fibers to which an inorganic substance such as magnesium hydroxide is added instead of halogen as a flame retardant, and whose oxygen index (OI value) is 25 or less. An air-impermeable layer 13 made of reinforced plastic is formed over the entire length to prevent gas from passing through. Here, if the fiber-reinforced plastic forming the air-impermeable layer 13 is one to which halogen is added as a flame retardant, it is unsuitable because there is a risk of generating toxic gas if it burns. In addition, in order to improve its flame retardancy, the amount of added inorganic substances has been increased to increase the oxygen index (OI value).
If the value is increased to 25 or more, the airtightness deteriorates as described above, causing gas to permeate through it, resulting in an inconvenience.

According to such a connection part case 10, since the main body 12 is made of flame-retardant fiber-reinforced plastics that do not contain halogen, it is possible to obtain excellent flame retardance and to prevent fires from occurring. No toxic gas is generated even when Also,
A non-air permeable layer 1 is provided on the inner circumference or intermediate portion of the main body 12.
3, it is possible to obtain excellent internal airtightness. In other words, since the air-impermeable layer 13 provides sufficient internal airtightness, it is possible to increase the amount of flame retardant added to the fiber-reinforced plastic forming the main body 12. The flame retardance of the lever connection case 10 can be further improved.

FIG. 2 shows another embodiment of the connection case of this invention, and the connection case 1 of this example.
4, the air-impermeable layers 13 in the one shown in FIG.

Therefore, even with the connection case 14 of this example, the same effects as the connection case 10 shown in FIG. 1 can be obtained.

[Effects of the invention] As explained above, the connection case of this invention is made of flame-retardant fiber-reinforced plastic that does not contain halogen, and gas is less permeable to the middle or inner circumference of the main body than the main body. Since the air-impermeable layer is formed, the halogen-free flame-retardant fiber-reinforced plastic that forms the main body provides excellent flame retardancy and prevents the generation of toxic gas in the event of a fire. Furthermore, the air-impermeable layer makes it possible to obtain sufficient airtightness inside the connection part case, so that it can also be suitably used in the connection part of a cable where gas maintenance is performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of the main parts showing one embodiment of the case for cable connection part of this invention, FIG. 2 is a schematic sectional view of the main parts showing another embodiment of this invention, and FIG.
This figure is a schematic side sectional view showing a conventional case for a cable connection part, and FIG. 4 is a - line view of FIG. 3. 1... Cable, 3, 10, 14... Cable connection case (connection part case), 4, 11...
Half body, 12...Main body, 13...Non-air permeable layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical case for a cable connection part that covers a cable connection part, the middle part or inner part of the main body being made of flame-retardant fiber-reinforced plastic that does not contain halogen. A case for a cable connection part, characterized in that an air-impermeable layer, which is more difficult for gas to pass through than the main body, is formed around the periphery. (2) The cable connection case according to claim 1, wherein the air-impermeable layer is made of synthetic resin. (3) The cable connection case according to claim 1, wherein the air-impermeable layer is made of halogen-free fiber-reinforced plastics with an oxygen index (OI value) of 25 or less.