JPH09140818A - Fireproof cover for cable or cable pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof cover for a cable capable of being fitted to the cable very simply, excellent in workability, fire resistance, and heat insulating property, and requiring a lower cost as compared with the case that the whole cable is formed with a fireproof material. SOLUTION: This fireproof cover is constituted of a heat insulating pipe 13 integrally laminated with two heat insulating pipe layers 13A, 13B while slits 17A, 17B are staggered in the peripheral direction and a fireproof heat insulating sheet 15 connected on the outer periphery of the pipe 13 so that both side edge sections are overlapped on the slit 17A. The heat insulating pipe 13 has a shape restoring property that the slits 17A, 17B are returned nearly to the original closed state when external force is removed after the slits 17A, 17B are opened by the external force. The fireproof heat insulating sheet 15 has flexibility that it can be easily deformed by the shape restoring force of the heat insulating pipe 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof cover used for fireproofing an electric cable, an optical cable, or a cable pipe in which these cables are drawn.

[0002]

2. Description of the Related Art Cables such as electric communication cables, optical communication cables and electric power cables use a flammable material such as polyethylene for an insulator, a protective coating, a sheath, etc. There is a risk of fire spread. In addition, if the cable pipe that pulls in the cable also catches a fire, there is a problem that the internal cable is damaged due to high heat.

For this reason, conventionally, a fireproof sheet is wound around a cable or a cable tube to perform fireproofing treatment. A conventional fireproof sheet is a ceramic fiber blanket (JIS R3311), which is a fireproof heat insulating material, covered on both sides with an aluminum foil-glass cloth composite sheet. In the ceramic fiber blanket, the bonding force between the ceramic fibers is weak and the ceramic fibers on the surface are easily separated, so that the composite sheet has a structure that protects the surface of the ceramic fiber blanket.

[0004]

However, since the conventional fireproof sheet needs to be wound one by one around the outer circumference of the cable or the cable tube, the work of attaching the cable or the cable tube is troublesome and troublesome. was there.

Further, since the conventional fireproof sheet obtains the required fire resistance and heat insulation performance by the ceramic fiber blanket, the higher the required fire resistance and heat insulation performance, the thicker the ceramic fiber blanket should be made. , The number of wrapping layers of fire protection sheet must be increased. This not only results in a large amount of expensive ceramic fiber blankets being used, resulting in high cost, but also results in a significant decrease in workability in winding the cable or cable tube.

In view of the above problems of the prior art, it is an object of the present invention to provide a cable or cable pipe fire protection cover which is easy to attach to the cable or cable pipe and is relatively low in cost. .

[0007]

DISCLOSURE OF THE INVENTION The cable or cable pipe fire protection cover of the present invention is such that the heat insulating pipe having one slit in the longitudinal direction is overlapped with both side edges on or near the slit. The heat-insulating pipe is joined to the outer periphery of the heat-insulating pipe, and the heat-insulating pipe can open the slit when an external force is applied, and returns to the original closed state when the external force is removed. The heat-resistant and heat-insulating sheet has a degree of shape-restoring property and is flexible enough to be easily deformed by the shape-restoring force of the heat-insulating pipe.

Since this fireproof cover has the above-mentioned structure, it can be attached to a cable or a cable tube as follows. First, the overlapping portions of both side edges of the fireproof heat insulating sheet are opened, and the slit of the heat insulating pipe is opened to cover the cable or the outer circumference of the cable tube. Then, the slit of the heat insulating pipe is naturally closed by the shape restoring force (it may be closed if not completely closed) to cover the cable or the cable pipe. Since the fireproof heat insulating sheet is also flexible, it follows the shape restoration of the heat insulating pipe to almost cover the cable or the cable pipe. With this, the fire cover will not fall off from the cable or cable tube, so overlap the both side edges of the fire resistant heat insulating sheet,
The binding member (string, tape, wire, etc.) may be used for binding so as not to open the overlapping portion. It is therefore extremely easy to attach to a cable or cable tube.

Further, in this fireproof cover, the outer layer side that is directly affected by the heat of the fire is made of a fireproof heat insulating sheet, and the inner layer side that is only indirectly affected by the heat of the fire is made of a heat insulating pipe. It has good fire resistance and heat insulation. Further, since the heat insulating pipe needs a certain degree of heat resistance but does not need to have fire resistance, it can be made of a foamed plastic pipe or the like, and the cost is lower than that of the case where all layers are made of a fire resistant material.

Further, since both side edges of the fireproof heat insulating sheet are superposed on the slit or near the slit, there is no fear that the fireproof and heat insulating properties of the slit portion are deteriorated.

As the fireproof heat insulating sheet, a ceramic fiber blanket, a thermally expansive sheet containing an inorganic substance,
A heat-foamable sheet obtained by applying a heat-foamable paint to a fireproof net can be used. As the heat insulating pipe, it is desirable to use a foamed plastic pipe, especially a flame-retardant foamed plastic pipe.

Further, as the heat insulating pipe, one in the longitudinal direction is used.
It is preferable to use two or more heat-insulating pipe layers having slits of a book, and the slits of adjacent layers shifted in the circumferential direction to be laminated and integrated. The shape recoverability can be improved by laminating two or more heat insulating pipe layers and integrating them. Further, by shifting the slits of the adjacent layers in the circumferential direction, it is possible to prevent deterioration of the heat insulating property of the slit portion.

Further, as the heat insulating pipe, one in the longitudinal direction is used.
It is preferable to use two or more heat-insulating pipe layers having the same length with slits of a book and adjoining layers that are shifted in the longitudinal direction to be laminated and integrated. Since the fire-prevention cover is a standard length, in order to perform fire-prevention treatment on long cables or cable pipes, it is necessary to keep several pieces in the longitudinal direction. Since the end face abutting portion of the heat insulating pipe layer is displaced in the longitudinal direction at the joint, it is possible to prevent deterioration of heat insulating property.

Further, it is desirable that the fire-resistant heat-insulating sheet is made longer than the heat-insulating pipe so that one end side of the fire-resistant heat-insulating sheet projects before the end of the heat insulating pipe. In this way, when connecting a standard length fire protection cover in the longitudinal direction and applying fire protection to a long cable or cable pipe,
Since the fireproof heat-insulating sheet can be wrapped at the joint of the fireproof cover, the fireproofness of the joint can be secured.

Further, it is desirable that the heat insulating pipe and the fire resistant heat insulating sheet are partially joined at one or more positions in the circumferential direction. If the heat-insulating pipe and the fire-resistant heat-insulating sheet are joined over the entire circumference, the entire fire-prevention cover becomes stiff, making it difficult to open the slits, and reducing the shape restoration property after opening, making it difficult to close the slits. Such partial inconvenience is unlikely to occur if they are partially joined. Particularly, it is preferable to have a structure in which one portion is joined to each side of the slit near the slit.

A metal foil is preferably attached to the outer peripheral surface of the fireproof heat insulating sheet. This can prevent damage to the surface of the fire-resistant heat-insulating sheet and improve fire resistance. As the metal foil, aluminum foil,
Although stainless steel foil or the like can be used, stainless steel foil is particularly effective in improving fire resistance.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] FIGS. 1 to 3 show an embodiment of the present invention. As shown in FIGS. 1 and 2, the fireproof cover 11 includes a heat insulating pipe 13 and a fire resistant heat insulating sheet 15 that covers the outside thereof. The heat insulating pipe 13 is composed of a foamed plastic pipe having one slit 17 in the longitudinal direction. The foamed plastic pipe has good heat insulation properties, and the slit 17 can be opened by applying an external force, and the slit 17 will naturally open when the external force is removed.
Has a shape-restoring property such that it returns to the original closed state.

The heat insulating pipe 13 preferably has appropriate heat resistance and flame retardancy. From this aspect, the heat insulating pipe 13
For example, a flame-retardant expanded polyethylene pipe or expanded melamine resin pipe may be used. The thickness of the heat insulating pipe 13 varies depending on the required heat insulating performance.
It is about 0 to 20 mm.

The fireproof heat insulating sheet 15 is made of, for example, a ceramic fiber blanket, the outer surface of which is an aluminum foil-glass cloth composite sheet 19A, and the inner surface thereof is an aluminum foil.
It is a composite of paper composite sheets 19B. The fire-resistant heat-insulating sheet 15 is joined to the outer periphery of the heat-insulating pipe 13 so that both side edges thereof are superposed on the slit 17. The fireproof heat insulating sheet 15 is made of the heat insulating pipe 13.
It is flexible enough to be easily deformed by its shape restoring force.

In the fireproof cover 11 having the above-described structure, the overlapping portion of the fireproof heat insulating sheet 15 and the slit 17 of the heat insulating pipe 13 are opened as shown in FIG. Then, the heat insulating pipe 13 closes the slit 17 to almost the original state by its own shape restoring force and covers the cable 21. Since the fireproof heat insulating sheet 15 has flexibility, it follows the shape restoration of the heat insulating pipe 13. Therefore, after this, the fireproof heat insulating sheet 1
The fireproofing process of the cable 21 is completed by overlapping the both side edges of 5 and lightly tightening the outer periphery with a fireproof band (for example, a steel band).

In the above fireproof cover 11, it is desirable that the heat insulating pipe 13 and the fire resistant heat insulating sheet 15 are partially joined at a plurality of circumferential positions. In the illustrated example, the heat insulating pipe 13 and the fire resistant heat insulating sheet 15 are joined by an adhesive agent on both sides of the slit 17 near the slit 17. 23A and 23B are the joints. The joint portions 23A and 23B are continuous in the longitudinal direction. In this way, the fire cover 11 is not stiff and the slit 17 can be opened and closed smoothly.

As shown in FIG. 2, the fire-resistant heat-insulating sheet 15 is longer than the heat-insulating pipe 13 so that one end of the fire-resistant heat-insulating sheet 15 extends beyond the end of the heat-insulating pipe 13. It has a structure. By doing this, when connecting the regular length fire protection cover in the longitudinal direction, if the end faces of the heat insulating pipe 13 are butted against each other at the joints, the ends of the fire resistant heat insulating sheets will wrap, so that the fire resistance of the joints will be improved. It is possible to secure the sex.

The outer surface of the fireproof heat insulating sheet 15 preferably has a structure in which stainless steel foil is laminated instead of the aluminum foil-glass cloth composite sheet. Since the stainless steel foil is strong against flame and has good corrosion resistance, it is effective in improving fire resistance and long-term reliability. The thickness of the stainless steel foil may be about 20 μm.

In this embodiment, the ceramic fiber blanket is used as the fire-resistant heat-insulating sheet 15, but a heat-expandable sheet that expands when heated by a flame to form a fire-resistant heat-insulating layer may be used instead. it can.
The heat-expandable sheet is a sheet formed by kneading a heat-expandable component such as graphite, perlite or sodium silicate and a binder such as flame retardant rubber. As the heat-expandable sheet, for example, Dunseal D (trade name) manufactured by Furukawa Techno Material Co., Ltd. is commercially available. When heated, the heat-expandable sheet expands 10 to 20 times in volume to form a good fireproof heat insulating layer. The thermal expansion sheet may have a reticulated form. When using a heat-expandable sheet,
The outer surface is not metal foil but rustan (carbon fiber cloth)
It is desirable to cover with.

[Second Embodiment] FIGS. 4 to 6 show another embodiment of the present invention. This fire protection cover 11 is the first embodiment.
2 is that the heat insulating pipe 13 has a two-layer structure. That is, the heat insulating pipe 13 in this embodiment has two heat insulating pipe layers 13A and 13B,
The slits 17A and 17B are laminated so as to be displaced in the circumferential direction, and are integrated by adhesion or fusion. When the heat insulating pipe 13 has such a structure, the shape recoverability of the heat insulating pipe 13 can be enhanced and the heat insulating property of the slit portion can be prevented from lowering.

Configurations and operations other than the above are the same as those of the first embodiment.
The same parts are designated by the same reference numerals and the description thereof will be omitted. The heat insulating pipe 13 may have a structure of three layers or more, if necessary.

[Third Embodiment] FIG. 7 shows still another embodiment of the present invention. The structure of the fireproof cover 11 is almost the same as that of the second embodiment, except that the heat insulating pipe 13 has two heat insulating pipe layers 13 of the same length.
A and 13B are shifted in the longitudinal direction and laminated and integrated. With this configuration, when the fire-preventing cover 11 is connected in the longitudinal direction, the end face butting positions of the heat insulating pipe layers 13A and 13B are displaced in the longitudinal direction at the joints, so that it is possible to prevent deterioration of the thermal insulation at the joints.

Configurations and operations other than the above are the same as those of the second embodiment.
The same parts are designated by the same reference numerals and the description thereof will be omitted. Although the illustration of the cross section of the fire protection cover is omitted in this embodiment, the cross section of the fire protection cover is not shown in the second embodiment.
Is the same as

[Fourth Embodiment] FIGS. 8 to 10 show still another embodiment of the present invention. The structure of the fire protection cover 11 is almost the same as that of the second embodiment, but the difference from the second embodiment is that the two heat insulating pipe layers 13A and 13B are laminated and integrated via the aluminum foil-paper composite sheet 25. That is what is being done. The aluminum foil-paper composite sheet 25 is laminated with the aluminum foil side facing outward. With such a structure, the heat insulating property can be improved by the heat reflectivity of the aluminum foil.

Configurations and operations other than the above are the same as those of the second embodiment.
The same parts are designated by the same reference numerals and the description thereof will be omitted. Instead of the aluminum foil-paper composite sheet 25, another metal foil having heat reflectivity or a composite sheet of the metal foil and a reinforcing material (paper or the like) can be used. Also in the case of the fire protection cover of this embodiment, as shown in FIG.
It is desirable to have a structure in which the two heat insulating pipe layers 13A and 13B are shifted in the longitudinal direction to be laminated and integrated.

[Fifth Embodiment] FIGS. 11 and 12 show still another embodiment of the present invention. In this embodiment, a spacer 27 is attached to the inner surface of the fire protection cover 11 having the same structure as that of the fourth embodiment at appropriate intervals in the longitudinal direction. As the spacer 27, for example, a cardboard strip formed of metal foil or the like can be used.
When such a spacer 27 is provided, an air layer is formed between the cable or the cable tube and the fire protection cover 11, so that the heat insulating property is further improved. Since the configuration, operation, and the like other than those described above are the same as those in the fourth embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[Sixth Embodiment] FIGS. 13 and 14 show still another embodiment of the present invention. The structure of the fire protection cover 11 is almost the same as that of the second embodiment, but the difference from the second embodiment is that the two heat insulating pipe layers 13A and 13B are laminated and integrated via the spacer 27. is there.
As the spacer 27, for example, a cardboard strip formed of metal foil or the like can be used. When such a spacer 27 is provided, the heat insulating pipe layer 13A is formed.
13B, an air layer 29 is formed, so that the heat insulating property is further improved. Configurations and operations other than the above are the same as those of the second embodiment.
The same parts are designated by the same reference numerals and the description thereof will be omitted.

[Seventh Embodiment] FIGS. 15 and 16 show still another embodiment of the present invention. This fire cover 11
Is almost the same as the fourth embodiment, but is different from the fourth embodiment in that a heat-foamable sheet 31 as shown in FIG. 17 is used as the fire-resistant heat-insulating sheet. The heat-foamable sheet 31 is a fire-resistant net 33 made of glass fiber thread or the like.
Further, a heat-foaming paint 35 which is foamed and carbonized by the heat of fire to form a fire resistant heat insulating layer is applied (manufactured and sold by Herberts Co., Germany). The inner surface of the heat-foamable sheet 31 is joined to the outer periphery of the heat insulating pipe 13 via the aluminum foil-paper composite sheet 19B (aluminum foil outer side).
The outer surface of the is open to the atmosphere to limit foaming in the event of a fire. Since the configuration, operation, and the like other than those described above are the same as those in the fourth embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0034]

As described above, since the fireproof cover according to the present invention is a combination of a shape-recoverable slit heat insulating pipe and a flexible fireproof heat insulating sheet, it can be applied to a cable or a cable pipe. Is extremely easy to install and has excellent workability. Further, since the outer side is made of a fire resistant heat insulating sheet and the inner side is made of a heat insulating pipe, both the fire resistance and the heat insulating property are excellent, and the cost can be made lower than that of the whole made of a fire resistant material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a fireproof cover of the present invention.

FIG. 2 is a vertical cross-sectional view taken along line AA of the fire protection cover of FIG.

FIG. 3 is a cross-sectional view showing a state in which a slit of the fire protection cover of FIG. 1 is opened.

FIG. 4 is a cross-sectional view showing a second embodiment of the fireproof cover of the present invention.

5 is a vertical cross-sectional view of the fire protection cover of FIG. 4 taken along the line BB.

6 is a cross-sectional view showing a state in which a slit of the fire protection cover of FIG. 4 is opened.

FIG. 7 is a vertical cross-sectional view showing a third embodiment of the fireproof cover of the present invention.

FIG. 8 is a cross-sectional view showing a fourth embodiment of the fire protection cover of the present invention.

9 is a vertical cross-sectional view taken along line CC of the fire protection cover of FIG.

10 is a cross-sectional view showing a state in which the slit of the fire protection cover of FIG. 8 is opened.

FIG. 11 is a cross-sectional view showing a fifth embodiment of the fireproof cover of the present invention.

12 is a vertical cross-sectional view taken along line D-D of the fire protection cover of FIG.

FIG. 13 is a cross-sectional view showing a sixth embodiment of the fireproof cover of the present invention.

FIG. 14 is a vertical cross-sectional view taken along line EE of the fire protection cover of FIG.

FIG. 15 is a cross-sectional view showing a seventh embodiment of the fireproof cover of the present invention.

16 is a vertical cross-sectional view taken along the line FF of the fire protection cover of FIG.

17 is a perspective view of a fireproof net used for the fireproof cover of FIG.

[Explanation of symbols]

 11: Fireproof cover 13: Heat insulating pipe 15: Fireproof heat insulating sheet 17, 17A, 17B: Slit 19A: Aluminum foil-glass cloth composite sheet 19B: Aluminum foil-paper composite sheet 21: Cable 23A, 23B: Joint part 25: Aluminum foil-paper composite sheet 27: Spacer 29: Air layer 31: Thermal foaming sheet (fireproof heat insulating sheet)

Claims (6)

[Claims] 1. A heat-insulating pipe having one slit in the longitudinal direction, and a fire-resistant heat-insulating sheet joined to the outer periphery of the heat-insulating pipe so that both side edges are superposed on or near the slit. The heat-insulating pipe has a shape-restoring property such that the slit can be opened by applying an external force, and the slit returns to the original closed state when the external force is removed. Is a fireproof cover for a cable or a cable pipe, which is flexible enough to be easily deformed by the shape restoring force of the heat insulating pipe. 2. An adiabatic pipe is formed by laminating two or more adiabatic pipe layers having one slit in the longitudinal direction, and arranging slits of adjacent layers in the circumferential direction so as to be laminated and integrated. A fire protection cover for a cable or cable pipe according to claim 1. 3. An adiabatic pipe is formed by laminating two or more adiabatic pipe layers of the same length having a slit in the longitudinal direction and adjoining layers in the longitudinal direction so as to be laminated and integrated. The fire protection cover for a cable or a cable tube according to claim 1 or 2, characterized in that. 4. The fire-resistant heat-insulating sheet is longer than the heat-insulating pipe, and one end side of the fire-insulating heat-insulating sheet is projected before the end of the heat-insulating pipe. Fire protection cover for cables or cable pipes according to item 1. 5. The cable or cable pipe according to any one of claims 1 to 4, wherein the heat-insulating pipe and the fire-resistant heat-insulating sheet are partially joined at one or more locations in the circumferential direction. Fire cover. 6. The fire protection cover for a cable or a cable tube according to claim 1, wherein a metal foil is attached to the outer peripheral surface of the fire resistant heat insulating sheet.