JPH0591637A - Refractory protection member for high tension refractory cable connector - Google Patents

Abstract

PURPOSE:To eliminate influence of oil content to a rubber member by easily disassembling or recovering a refractory coating of a high tension cable connector or the outer part of a high voltage branch such as a part for connecting or branching a high voltage refractory cable and eliminating contact of a refractory filler directly with the sheath of the cable. CONSTITUTION:In a high tension cable connector for connecting a high tension refractory cable, a unit 27 in which a refractory protection member so provided as to cover the periphery of the cable connector is cylindrically split and a refractory filler is adhered to the inner surface of a case member 28 is employed. In the unit 27, a sheet member such as vinyl is integrally adhered to the surface of the filler 25 to cover it. When the connector is disassembled, the filler may easily be peeled from the surface of the body of the connector. Further, protrusions are formed on the inner surface of the case member, and means for improving adherence of the sheetlike filler may be added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for protecting the surface of a high-voltage fireproof cable connecting portion with a protective case member and a fireproof filler, and more particularly to disassembling the cable connecting portion at the time of attachment and detachment,
A high pressure that facilitates restoration and covers the surface of the fire-resistant filler that contacts the cable sheath with an oil blocking sheet member so that the oil content of the fire-resistant filler does not affect the rubber member placed on the surface of the cable. The present invention relates to a fireproof protection member for a fireproof cable connection portion.

[0002]

Background of the Invention and Prior Art In recent years, there has been a tendency for electric power demand in office buildings and the like to increase, and in order to meet the electric power demand, the main distribution system in the building is constructed using high-voltage fireproof cables. Equipment for supplying power to each demand destination is often used through substation equipment installed on each floor or the like. However, the cable used for the power supply system in the building should have fire resistance as specified in Fire Defense Agency Notification No. 7 (October 16, 1978), especially in the case of high voltage. Is required to do. The fire resistance required for the high-voltage fire-resistant cable is such that it is possible to continue power feeding without causing a short circuit or the like in a state of being placed in a heating furnace heated to 840 ° C. for 30 minutes. ing.

Therefore, in a general high-voltage fireproof cable, a means such as winding mica tape around the conductor is used,
Even if the insulator or sheath that covers the surroundings burns, the mica tape that covers the periphery of the conductor can maintain the insulating state, and even if a fire accident occurs, use a means to continue power supply. There is. When connecting the high-voltage fireproof cable as described above, for example, as shown in FIG.
By using the connecting means as shown in FIG. 1, even when the high voltage cable connecting portion is exposed to high temperature, the insulation of the connecting portion of the cable can be maintained.

As shown in the high-voltage cable connecting portion 10a of FIG. 11, the high-voltage fireproof cables 1, 1a have their conductors 2 covered with a mica tape 5 and surrounded by an insulator 3 and a sheath 4. It is configured to cover. When connecting the high-voltage fireproof cables 1 and 1a, the sheath 4 and the insulator 3 are stripped to remove the conductors 2 and 2.
Is exposed, and the tip of the conductor is inserted into the conductor connecting pipe 11, and compressed and fixed to connect. A mica tape is wound in multiple layers to form a refractory layer 12 around the connection part using the conductor connecting pipe 11, and a self-bonding tape is provided over the refractory layer and the periphery of the insulator of the high-voltage refractory cable. The reinforcing insulator 13 wound in multiple layers is formed. Further, the reinforcing insulator 1
On the surface of 3, a conductive tape 14, a flat braided copper wire 15 to be connected to the shielding copper tape of the cable, and a copper bind wire 16 are provided, and the periphery thereof is covered with a fireproof protective layer 17, and a waterproof tape. The anticorrosion layer 18 (made of chloroprene rubber) is coated.

By constructing the high-voltage cable connecting portion 10a as described above, even when the high-voltage cable connecting portion is exposed to a high temperature due to a fire or the like and the surface covering member burns, the fire-resistant protective layer 17 is formed. The layer can protect the members inside thereof. Further, even if the lower layer member covered with the fireproof protective layer 17 burns, the fireproof layer 12 covering the conductor and the periphery of the conductor connecting pipe 11 maintains the insulating action, so that the high-voltage fireproof cable There will be no problems such as short circuit.

[0006]

In the conventional high-voltage cable connecting portion 10a shown in FIG. 11, the fireproof layer 12 and the fireproof protective layer 17 are made of a tape-like material usually called mica tape, and the mica tape is It is formed by winding it in multiple layers with a 1/2 wrap. However, since the mica tape is formed by sticking a thin piece of mica (mica) to a glass cloth, it is inflexible and the winding work is troublesome, so it takes time to connect the high-voltage fireproof cable. There is a problem in that it is necessary or the connection cost of the high-voltage fireproof cable becomes very high. In addition, in order to increase the power feeding capacity of the cable, it is necessary to configure the high-voltage fireproof cable with a thick one, and when applying the connecting means as described above to a thick high-voltage fireproof cable, stable insulation performance is required. It has become difficult to maintain.

However, in the conventional high-voltage fireproof cable, since there is no connection method other than using the high-voltage cable connection portion as shown in FIG. 11, the work of winding the mica tape is carefully performed to ensure sufficient insulation performance. The fireproof layer and the fireproof protective layer are formed so as to be secured in Therefore, in order to minimize the labor for forming the high-voltage cable connecting portion as described above and to simplify the structure of the high-voltage cable connecting portion, the periphery of the connecting portion should be covered with a protective case and a fireproof filler. Different means have been proposed. As the protection means used for the high-voltage fire-resistant cable connection portion, a method is used in which a sheet-shaped fire-resistant filler is wrapped around the high-pressure fire-resistant cable connection portion with a predetermined thickness, and a protective case is attached around the winding. be able to.

However, if the above-mentioned refractory filler is wrapped around the high-pressure refractory cable connection portion and the work of attaching the protective case to the surface portion is carried out on site, the work is troublesome and the construction period is long. The problem occurs. Therefore, it is a good idea to construct the protective case in half and prepare a unit with the refractory filling attached to the inner surface of the case member in advance so that work at the site can be performed easily. Has been.

However, for example, the refractory filler attached to the inner surface of the metal case member contains a large amount of oil, as will be described later, and in particular, has a characteristic that it greatly affects rubber members and the like. is doing. That is,
In general cable connection portions, the surface anticorrosion layer is often made of chloroprene rubber, EP rubber, etc., and even in the case of high-voltage fireproof cables, the surface layer is made of rubber material. It is common.
And, in the case where the fireproof filler is used as the fireproof protective member in the cable connecting portion as described above, the oil content contained in the fireproof filler is directly in contact with the surface of the cable connecting portion. As a result, the rubber member may accelerate the deterioration speed.

[0010]

It is an object of the present invention to simplify a mechanism of a connecting portion when forming a fireproof connecting structure to a connecting portion of the cable in a power feeding system using a high voltage fireproof cable and to connect the cable. For the purpose of providing a means for facilitating disassembly and restoration at the time of attachment / detachment and for preventing the refractory filler provided so as to cover the outer periphery of the connection portion from affecting the coating layer of the cable. There is.

[0011]

According to the present invention, the cable conductors are connected to each other on an intermediate conductor connecting portion where the conductors can be connected by a conductor connecting pipe or a plug-reset method, or the cable conductor end is connected to a conductor fitting for suspending a cable conductor. The present invention relates to a connection part of a high-voltage fireproof cable, which is provided with at least a reinforcing insulator and an outer semiconductive layer on the periphery of the end conductor connection part. In the present invention, a protective case member arranged so as to cover the surface of the high-voltage fireproof cable connection portion,
A plurality of case members that are divided in the radial direction are combined to form a unit, and a fireproof filler having a predetermined thickness is integrally attached to the inner surface of the case member to form a unit, and the inner surface of the unit is protected by a sheet member. It is characterized by

As described above, by using a unit in which a refractory filling is integrally held on the inner surface as a member for covering the connection portion of the high-voltage refractory cable, the case member is handled and the fire protection member is provided. At this time, the refractory filling does not peel off from the case member, and the refractory member can be easily assembled. Further, by covering the surface of the refractory filling with a sheet member, without directly contacting the rubber member covering the surface of the cable connection portion, disassembly at the time of connection / detachment detachment, restoration is ready, and, The oil contained in the refractory filling is prevented from affecting the rubber member, and the sheath of the cable is not deteriorated even if left alone for a long period of time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a high-voltage fireproof cable connecting portion and the fireproof structure of the present invention will be described with reference to the illustrated example. The example shown in FIG. 1 shows a configuration of a portion to which a high-voltage fire-resistant cable is connected.
Like the general fireproof cable, the conductors 2 and 2a whose surfaces are coated with mica tapes 5 and 5a are used. In the high-voltage fireproof cable 1, 1a shown in FIG. 1, a semiconductive tape, between the insulator layers 3, 3a and the sheaths 4, 4a,
For example, the one formed by covering the outer semiconductive layers 6 and 6a made of carbon-containing butyl rubberized polyester non-woven tape and the metal shielding layers 7 and 7a made of copper tape is used. In the high-voltage cable connecting portion 10 shown in FIG. 1, the connecting end portions of the two high-voltage fireproof cables 1 and 1a to be connected have the conductor 2 as in the case shown in FIG.
The exposed portion is inserted into the hole of the conductor connecting pipe 11 and compression fixed.

Further, the surface coating layer 4 on the surface of the cable is peeled off in a predetermined range, and the fireproof tapes 5 of the cables on both sides are removed.
A semi-conductive layer 8 is formed around the portion 5a and the sleeve 11, and then a self-bonding tape is wound around the exposed surface of the insulating layer 3 and the surface of the conductor connecting tube 11. A reinforced insulator 13 is provided. The semiconductive layer 8 is provided in order to relieve stress caused by a scratch or the like that occurs when the conductor connecting tube 11 is attached, and is wound with a semiconductive rubber tape or made of a semiconductive material. A shrinkable tube can be attached. Further, an external semiconductive layer 14 formed by winding a semiconductive tape, for example, a carbon-containing butyl rubberized polyester non-woven tape on the surface thereof is applied over the shielding layers 7 and 7a of the cables on both sides, and the surface thereof is flat knitted. A connection portion shielding layer 9 composed of a copper wire and a bind wire is formed, and the surface thereof is covered with an anticorrosion layer 18 formed by winding a waterproof tape.

As described above, after connecting the conductor of the high-voltage fireproof cable, in the present invention, the surface of the connecting portion is covered with the fireproof filler 25, and the protective case member 20 is attached and fixed to the outside thereof. .. Examples of the fireproof filler 25 include fireproof putty (DF) manufactured by Mitsubishi Cable Industries, Ltd.
Putty N, DF putty A ... Both can be used as product names. In the putty used as the refractory filling, for example, DF putty N is a flame retardant material, an organic binder,
It is composed of an inorganic filler, a flame-retardant reinforcing fiber and the like, and is a gray semi-soft material and is formed into a sheet shape or a rod shape. And the rod-shaped or sheet-shaped DF
Depending on the surface of the target cable or the like, the putty N is either used as it is or is deformed by being wrapped around the cable or the like. Also, the DF
Putty N is made of a material that solidifies when it comes into contact with a flame and then forms a hard carbonized layer. When heated to a high temperature, its shape does not collapse, and the internal cable, etc. To be able to hold and protect.

Apart from the DF putty N, the DF putty A
Is a carbon molding material, a foam material, a flame-retardant dehydrating material, a mineral oil-based binder, an inorganic filler, a flame-retardant reinforcing fiber, and the like. Similar to the above, a rod-shaped or sheet-shaped one is used. Further, the DF putty A is made of the above-mentioned constituent materials, and when it comes into contact with a flame, it is carbonized and foamed at about 300 ° C., and the expansion pressure thereof closes the voids, and at the same time, it can exhibit hardening such as heat insulation. To be done. Further, when the protective case member 20 is applied to the surface on which the fire-resistant filler is applied, even if there is a slight gap between the protective case member 20 and the waterproof tape 18 of the high-voltage cable connection portion, the fire-resistant filler does not have plasticity. The refractory filling is deformed by the pressing force when the protective case member is attached, and the gap can be filled.

In the means for protecting the surface of the high-voltage cable connecting portion using the protective case member as described above, the present invention has the property that the protective case member melts at high temperature and the property that it does not melt at high temperature. The thing different from the thing in the property of the refractory filling with which the inside is filled can be used. For example, when glass, rubber, plastic, aluminum, or another material that melts at high temperature is used as the protective case member having the property of melting at high temperature, the refractory filling material to be filled inside the protective case member is, for example, A material having self-hardening property when exposed to high temperature, such as the DF putty N, can be used. Then, even if the protective case member melts at a high temperature of 840 ° C., the refractory filling is hardened to form an outer protective layer of the high-voltage cable connecting portion, and the inner protective member is burned. Can be prevented.

On the other hand, as the protective case member, for example, copper, copper alloy, stainless steel, ceramics (ceramic), calcium silicate, magnesium, or another material that does not melt at high temperature is used as the protective member for the surface of the single-core cable. In the case of using a protective case member made of iron for a multi-core cable, the refractory filling material filled in the protective case member is exposed to high temperature to be self-hardening. It is not necessary to limit the materials to be used. That is,
In that case, since the protective case member does not burn or melt at high temperature, only the heat insulating property is required for the refractory filling material. Therefore, when the protective case member has a property of not melting, by applying heat as a refractory filling like the DF putty A,
A material having the property of foaming and expanding can be used. Further, since the refractory filling as described above has the property of expanding by heat, even if there is a slight gap between the outer coating layer of the high-voltage refractory cable and the inside of the protective case member, the refractory filling can be used. When an object is heated to a high temperature, it expands to fill the gap, and the protective action of the protective case member and the refractory filling can be exhibited well.

In the high-voltage cable connecting portion 10 of the present invention constructed as described above, the protective case member arranged on the outer side thereof has a shape obtained by dividing a cylinder into two, as shown in FIGS. It is possible to use those described above, but it is also possible to use a combination of a cylinder divided into three members or the like. The protective case member shown in FIG. 2 shows a case in which a cylinder is divided into two parts, a flange 21 is provided so as to project at the mating part, and a means for fixing the flange part with a bolt or the like is used.
Further, in the protective case member 20a shown in FIG. 3, it is possible to use a means in which the ends of two semi-cylindrical members are overlapped with each other and the tightening band 22 is arranged on the outside thereof and fixed. .. Further, in the example of the protective case member 20b shown in FIG. 4, it is possible to use a means for tightening and fixing with the tightening band 22 in a state where the ends of the semi-cylinders are joined.

The fireproof structure of the high-voltage fireproof cable connecting portion of the present invention is not limited to the connecting portion using the conductor connecting pipe as shown in FIG. 1 but also a plug / reset type (so-called tulip contact type, plug-in type). It is also possible to apply the fire resistant structure of the present invention to a connecting portion constituted by a formula etc.). Further, the fire resistant structure of the connection portion of the present invention can be applied to either a single-core or multi-core cable. Furthermore, even if the cable has a round or gourd-shaped cross-sectional shape, the shape of the protective case that covers the outer circumference of the connection portion is similar to the outer shape of the target cable or the like. It can be easily applied by configuring as.

In the fireproof protection member of the present invention having the above-described structure, when the protection case and the fireproof filler are integrally formed, the protection case is divided as shown in FIGS. The means for forming the case member is used. As shown in the sectional view of FIG. 5, the case member constitutes one unit 27, and the unit 27 integrally adheres a sheet-shaped refractory filler 25 to the inner surface of the case member 28. In addition, the surface of the refractory filling is covered with the sheet member 26. The sheet member is made of vinyl, polyethylene or the like having excellent oil resistance, and acts so that the oil component contained in the refractory filling is not exposed on the surface of the sheet member.

When the cable connecting portion is attached so as to cover the inner surface of the unit of the case member while being covered with the sheet member 26, the surface of the connecting portion is covered with the sheet. The refractory filler is wrapped around the top. Therefore, when the unit of the fireproof protection member of the present invention is combined and used as the fireproof protection means of the cable connecting portion, even if the cable to be connected is provided with a coating made of a rubber material, the fireproof filling material is used. Since it does not come into direct contact, it is not affected by oil. Further, as described above, when the unit of the fireproof protection member is used, the unit can be manufactured at the factory and assembled at the site to easily form the fireproof structure.

In addition, after the unit of the fireproof protection member is manufactured in a factory, the fireproof filler adhered to the inner surface of the case member 28 may be peeled off while being carried on site and assembled. The putty used as a refractory filler as described above has a relatively high viscosity,
For example, even when it is attached to the inner surface of an aluminum case member, it is held in the attached state due to its viscosity,
When the refractory filler is shocked during transportation, the sheet may peel off. Therefore, in the unit 27 of the present invention, as shown in FIG. 6, the protrusions 29 ... Are provided so as to protrude from the inner surface of the case member so that the protrusions can bite into the back surface of the sheet of refractory filling. It is possible to attach the sheets in a state where they can be prevented from peeling off.

That is, in the example shown in FIG. 6, a large number of protrusions 29 ... Are arranged so as to project on the inner surface of the case member 28. It can be arbitrarily set according to the size of the case and the like. For example, the larger the protective case,
When the number of protrusions is increased and the arrangement interval is set to be narrow, the holding performance for the sheet-shaped fireproof member 25 can be improved. As the fire-resistant member 25 arranged on the inner surface of the case member 28, a sheet-shaped member having a thickness of about 6 mm is used, and due to the viscosity of the fire-resistant member 25, the fire-resistant member 25 is fixed in a state of being attached to the inner surface of the case member 28. The sheet-like member 26 made of vinyl or the like is attached so as to cover the surface of the refractory member to protect the surface.

Further, in the case member 28 of the present invention, the member protruding to the inner surface thereof can be constituted by a vertical ridge or a horizontal ridge. The vertical ridges and the horizontal ridges formed by projecting on the inner surface of the case member 28 are
The case member can be formed to have an arbitrary length with respect to the arc direction or the length direction. For example, when forming a lateral protrusion in the arc direction, the case member is formed to have a long arc. can do. The protrusion 29
Alternatively, the vertical ridge, the horizontal ridge, or the like may have a trapezoidal cross section, an arcuate cross section, or an arbitrary shape. Further, the height of the protrusions is about half the thickness of the refractory member 25. For example, when a sheet having a thickness of 6 mm is used, the protrusion height of the protrusions is 3 to 4 mm. Is set to.

With the above-mentioned structure, the contact area between the refractory member and the protrusion is increased by pressing the refractory member 25 against the protrusion 29 or the like protruding from the inner surface of the case member 28. The refractory member can be set so that the refractory member does not easily separate from the inner surface of the case member 28 and can be held. Further, as the case member 28, either a material having a property of melting when exposed to high temperature or a material having a property of not melting can be used. Further, as the fire-resistant member 25, as described above, a putty member having arbitrary properties such as commercially available DF putty N and DF putty A can be used.
Then, a sheet-like member of the putty member is integrally attached to a case member in a factory to form a unit, and at the construction site, the unit is assembled around the high-voltage fireproof cable connection portion to provide a fireproof structure. Can be configured.

(Fireproof Structure at High Voltage Branch Using L-Type Connector) In addition to the fireproof structure at the high voltage fireproof cable connecting portion as shown in FIG. 1, the fireproof structure of the present invention is shown in FIG. It can also be applied to a high-voltage branching part using an L-type connector or the like as shown. In the example shown in FIG. 7, a protective case member 23 having a refractory filling 25 filled therein is attached to the entire outer periphery of the high-pressure branch portion 30 with respect to a connection portion using a general L-type connector. The entire high-pressure branch section 30 can be made fire resistant. In FIG. 7, high-voltage fireproof cables 1, 1a
, The spacers 32 are composed of insulating portions 32a and conductive portions 32b, the insulating portions 33a and the inner and outer conductive portions 3 are connected to each other.
An insulating cylinder 33 composed of 3b and 33c is provided, a branch socket 40 is attached to the connection conductor 31, and a ground wire 36 is arranged. In this case, a reinforcing insulator (made of EP rubber) is used as the tubular insulating portion 33a of the insulating tube 33, and the outer conductive portion 33c integrally molded on the circumference thereof.
Can be configured by using an external semiconductive layer (made of conductive EP rubber). In addition, the conductive tape 3 is provided on the outer peripheral portion of these members.
4, the outer protective layer 35 is applied, and the main body cable side is configured with the branch socket 40 projecting at a right angle.

In the L-shaped connector 41, the connection plug terminal 42 is protruded from one end of the body of the L-shaped connector, and the branch wire is provided on the other end of the L-shaped connector 41. The conductor 2b of the high-voltage fireproof cable 1b is attached via the crimp terminal 43. Then, by inserting the connection plug terminal 42 of the L-type connector 41 into the branch socket 40 and fixing it, the high-voltage branch section 30 can be configured. In the present invention, the entire outer periphery of the high-pressure branch portion 30 may be covered with the protective case member 23 so as to have fire resistance. Further, as the protective case member 23 and the refractory filling 25 filled therein, those having the properties as shown in the above-mentioned embodiment can be used in combination.

As shown in FIG. 8, the protective case member 23 attached to the high-voltage branching portion 30 as described above covers the main body portion and the outer peripheral portion of the L-type connector with separate members. It can be configured as anything. In the protective case member 23 of the high-voltage branch section 30 shown in FIG. 8, the protective case member 23a arranged on the main body side and the protective case member 23b arranged on the L-shaped connector 41 side are separately configured. , And these are combined into a substantially semi-cylindrical shape so as to cover the outer periphery of the connecting portion. Further, the connecting portions of the two types of protective case member members 23a and 23b can be made to have a shape in which they are overlapped with each other, so that the fire resistance performance of the connecting portions can be secured.

The high-voltage branch portion using the L-type connector shown in FIGS. 7 and 8 is for connecting a high-voltage fireproof cable,
Assembly of branch socket 40 and L-type connector 4
1 can be mounted in the same manner as in the case of the conventional high-voltage fireproof cable, and after the connection work, the fireproof filler 25 and the protective case member 23 are provided on the entire outer peripheral portion of the high-voltage branch portion. By applying the above, it is possible to secure the fire resistance performance at the high-pressure branch portion. When removing the L-shaped connector, the protective case member 23 is removed, and at the same time, the refractory filler is removed to expose the high-pressure branch portion.
The construction can be performed in the same process as in the case of the connector member without the protective case member. Further, the connecting means having the fire resistance of the present invention is, for example, the actual Kaihei 1-16272.
In the case of providing a connector, which is almost similar to the connecting portion as shown in Japanese Patent Publication No. 8), to the high-voltage branching portion, Japanese Patent Laid-Open No. 2-2
It can be used as a means for maintaining the fire resistance of the high-voltage branch portion, such as a connector portion provided on a flat cable as disclosed in Japanese Patent No. 3015.

The protective case 2 shown in FIG.
As 3a and 23b, units in which a case member and a refractory member as shown in FIG. 5 or 6 are integrally formed are used, and a sheet member is integrally provided on the inner surface of the refractory filler in the unit. Can be used. Then, the unit of the case member is created in the factory according to the structure of the target connecting portion, and the fireproof protection means can be configured for the cable connecting portion at the construction site,
Fire resistance on the cable route can be exhibited. Further, in the case of using a unit in which the case member and the fireproof member are integrally provided, when increasing the branching capacity in the connector portion, the fireproof member is also integrally peeled when the case member is removed. Because you can
Subsequent processing operations can be easily performed. Further, as shown in FIG. 5 and the like, when the surface of the refractory filler is covered with a sheet member, the refractory filler does not directly adhere to the surface of the cable, etc. The work of removing the protective member can be easily performed.

(Fireproof Structure of Cable Termination) When a fireproof structure is applied to a high pressure fireproof cable arranged on an electric shaft of a building or the like, separately from the high pressure branch section shown in FIG. It is necessary to suspend the upper end of the shaft from the ceiling of the shaft. In that case, in general,
Although the cable is configured to be suspended via insulating glass or the like, in the present invention, a high voltage terminal portion 50 as shown in FIGS. 9 and 10 can be used. The high-voltage terminating portion 50 has a conductor connecting fitting 53 having a T-shaped cross section for suspending a cable conductor, via a cable hanging fitting 51 having a bolt hole for hanging and an insulating block 52 made of epoxy resin or the like. The direct connector 56 attached to the end of the conductor 2 of the high-voltage fireproof cable 1 is mounted (screwed) on the conductor coupling fitting 53.
To do.

When the direct connector 56 provided at the end of the high-voltage fireproof cable 1 is connected to the conductor connecting fitting 53, the connecting portion is surrounded by an insulating tube (insulating reinforcement body) 55 and a tightening band. 54 is attached to secure the electric field relaxation and the fixed state of the connection portion. That is, the insulating cylinder 55 is of a premolded type provided with the inner semiconductive layer 55a, the insulating layer 55b, and the outer semiconductive layer 55c. A conductive tape 57 is wound around the lower end of the insulating cylinder 55 so as to be connected to the shielding layer of the cable 1, and a ground wire 59 is drawn out. Then, the hanging fitting 51
It can be attached to a support member arranged on the ceiling of the building through the attachment hole provided in, and the high-voltage fireproof cable 1 can be hung and held via the high-voltage terminal portion 50.
It is possible to secure fire resistance in the high-pressure terminal end portion.

High-voltage termination section 50 constructed as described above.
In this case, since it is necessary to protect a predetermined section of the hanging metal fitting 51 and the base of the high-voltage fireproof cable 1, as shown in the figure, the entire case is covered by a protective case member 24, and the protective case member 24 is covered. The inside of 24 is filled with a refractory filling 25. Further, in the high voltage terminal portion shown in FIG. 7, a protective case member 2 for protecting the outside is provided.
4 can be used in combination with the two split shapes as shown in FIGS. further,
The refractory filler to be filled in the inside of the protective case member can also be configured by attaching it to the outer surface of the main body connecting part, which is configured by being attached to the inner surface of the protective case member in advance.

In the above embodiment, the protective case member 24
The refractory filler 25 and the refractory filler 25 are, as shown in the above embodiment, a combination of a protective case member having a property of melting at a high temperature and a refractory filler having a self-hardening property, or a protection having a property of not melting at a high temperature. A combination of a case member and a foamable refractory filler, such as a combination of those having arbitrary performance, can be used. Further, also in the high voltage terminal portion 50 shown in FIGS. 9 and 10, as the protective case 24, a unit in which the case member and the fireproof member as shown in FIG. 5 or 6 are integrally formed may be used. it can. Then, the unit of the case member can be created in the factory according to the structure of the target connecting portion, and fireproof protection means can be configured for the cable connecting portion at the construction site, and the fireproof performance in the cable line. Can be demonstrated.

Therefore, in the power supply system arranged in the building, a high-voltage fireproof cable can be used as a main cable, and an insulating protective layer of mica tape is provided in the high-voltage fireproof cable portion. Even if the protective layer of the cable burns out due to a fire,
The insulation of the conductor can be maintained. On the contrary,
At the branch part of the high-voltage fireproof cable, even if the fireproof protective layer such as mica tape is not formed around the connector, the high-voltage branch part as shown in the figure will prevent the connector part from burning. Therefore, the insulating state of the connector can be maintained even when exposed to a high temperature. Furthermore, at the high-voltage termination provided at the top of the high-voltage fire-resistant cable, the hanging metal fitting and the fixing member at the upper part of the cable are covered with a protective member that is a combination of a protective case member and a fire-resistant filler, even in the case of a fire, The insulating state of the high voltage terminal part can be maintained well.

As described above, when constructing a power supply system in a building using the protective member of the present invention, the high-voltage fireproof cable 1 is cut in advance to a predetermined length, and the A connector can be attached to the branch of each floor. When the high-voltage fireproof cable 1 is laid, it is pulled into the electric shaft of the building, the uppermost high-voltage terminal end portion 50 is fixedly held on the ceiling support member, and the branch line is connected to the transformer on each floor. To let When the power receiving capacity at each floor is to be changed while the power feeding system is in use, the high-voltage fireproof cable 1 should be replaced with a cable having a large power feeding capacity, or the branching connector should be of a large capacity. Means such as replacement can be applied. For example, even when the connector is replaced with a large capacity connector, in the present invention, the protective case member 23 arranged on the outer side of the termination connecting portion as shown in FIG. 9 is removed and the refractory filling is peeled off. Then, remove the connector, attach a large-capacity connector separately, and fireproof the outside.

[0038]

As described above, by using the unit integrally holding the refractory filling on the inner surface as the member for covering the connecting portion of the high-voltage refractory cable, in the present invention, when the case member is handled. Alternatively, when the fireproof protection member is applied, the fireproof filler does not peel off from the case member, and the work of the fireproof member can be easily performed.

Further, since the surface of the fire-resistant filling is covered with a sheet member so as not to come into direct contact with the rubber member covering the surface of the cable connecting portion, a space between the surface of the cable connecting portion and the fire-resistant filling is provided. Can be easily peeled off and can not be peeled off between the protective case and the refractory filling. Therefore, it is possible to easily disassemble and restore the cable connecting portion at the time of attachment and detachment, and it is possible to prevent the oil content contained in the refractory filling from affecting the rubber member, and even if it is left as it is for a long time, the cable The sheath does not deteriorate.

Furthermore, the fireproof protection member of the high-voltage fireproof cable connecting portion of the present invention is not only used for connecting two cables in a straight line, but also for treating a branch portion, a terminal portion, etc.
The fire resistance of the connecting portion can be ensured. And, since only the combination of the fireproof filler and the protective case member is applied to the surface of the connection portion, the fireproof treatment can be easily performed, and the fireproof performance at the high voltage cable connection portion can be easily ensured. By forming a protective case member in advance in a shape corresponding to the application point of the fireproof structure for the high-voltage fireproof cable connection part, the high-voltage branch part, the high-voltage terminal part, etc. It is possible to easily carry out the fireproof treatment by the member and the fireproof filler.

[Brief description of drawings]

FIG. 1 is an explanatory diagram when the fireproofing means of the present invention is applied to a high-voltage fireproof cable connecting portion.

FIG. 2 is an explanatory diagram of a combined state of protective case members.

FIG. 3 is an explanatory diagram of a combined state of protection case members having another configuration.

FIG. 4 is an explanatory diagram of a combined state of protection case members having other configurations.

FIG. 5 is a cross-sectional view showing the structure of the unit of the case member of the present invention.

FIG. 6 is a perspective view showing another configuration of the unit of the case member.

FIG. 7 is an explanatory diagram when the fireproofing means of the present invention is applied to a high-pressure branch portion.

FIG. 8 is a side view of the protective case shown in FIG.

FIG. 9 is an explanatory diagram when the fireproofing means of the present invention is applied to a high-voltage terminal end.

FIG. 10 is a cross-sectional view showing the configuration of the high-voltage termination section shown in FIG.

FIG. 11 is an explanatory diagram of a conventional fireproof treatment structure for a high-voltage fireproof cable connecting portion.

[Explanation of symbols]

1 high-voltage fireproof cable, 2 conductors, 10 and 10a
High-voltage cable connection part, 11 conductor connection tube, 12
Fireproof layer, 17 Fireproof protective layer, 18 Waterproof tape, 20, 23, 24 Protective case member, 25
Refractory filler, 26 sheet member, 27 unit, 28 case member, 29 protrusion, 30
High voltage branching part, 31 connecting conductor, 33 insulating tube,
40 branch sockets, 41 L-type connectors, 5
0 High-voltage terminal part, 53 Conductor connecting metal fittings, 55
Insulation tube, 56 direct connector,

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 8, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

As described above, by using a unit in which a refractory filling is integrally held on the inner surface as a member for covering the connection portion of the high-voltage refractory cable, the case member is handled and the fire protection member is provided. At this time, the refractory filling does not peel off from the case member, and the refractory member can be easily assembled. Further, by covering the surface of the refractory filling with a sheet member, there is no direct contact with the rubber member covering the surface of the cable connecting portion, which facilitates disassembly and restoration when the connecting portion is detached. Moreover, the oil contained in the refractory filling is prevented from affecting the rubber member, and the sheath of the cable is not deteriorated even if it is left as it is for a long time.

Claims (1)

[Claims] 1. At least reinforcement on an intermediate conductor connecting portion for connecting the cable conductors to each other by a conductor connecting tube or a plug-lessep method, or on a terminating conductor connecting portion for connecting a cable conductor end to a cable metal hanging conductor fitting. In a connection part of a high-voltage fire-resistant cable provided with an insulator and an outer semiconductive layer on the periphery thereof, a protective case member arranged so as to cover the surface of the high-voltage fire-resistant cable connection part is divided into a plurality in the radial direction. Characterized in that a fireproof filler having a predetermined thickness is integrally attached to the inner surface of the case member to form a unit, and the inner surface of the unit is protected by a sheet member. Fireproof protection material for high-voltage fireproof cable connections.