JPH08126164A - Fireproof structure for cable penetration part - Google Patents

Abstract

PURPOSE: To obtain a fireproof structure for cable penetration part in which the fireproof work can be carried out from only one side of a wall for a penetration part of large number of cables to be laid on a cable rack while facilitating the extension work after finishing the fireproof work. CONSTITUTION: A large number of cables 3, 3, ... are arranged, being laid on a cable rack 4, in a hole 1 through a partition wall 2 of a fire-resistant structure. Under a state where the cables and the cable rack, at an opening 1a on one side of the through hole, are coated with a fireproof putty 8, the cables and the cable rack are held by means of a pair of fireproof shielding plates 5, 5 from the opposite outsides. Each shielding plate is fixed independently and detachably to the cable rack through a fixing means 6 and the gap between the outer circumference of the cables and the cable rack, shielded by the pair of shielding plates, and the opening on one side of the through hole is shielded by a fireproof partition board 7 through the fireproof putty part 8. This structure is also applicable to a cable penetration part penetrating the floor slab.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof structure for a cable penetrating portion such as a power cable arranged through a partition wall or a floor wall of a fireproof structure such as a hotel, an apartment or an office building, and more particularly to a fireproof structure. The present invention relates to a fireproof structure for facilitating cable extension work after fireproofing, targeting a large opening cable penetration portion where a large-scale cable group is arranged.

[0002]

2. Description of the Related Art Generally, in the above fire resistant structure, in order to prevent flame and heat from spreading to the other floors or other compartments through the cable penetration portion and spreading when a fire occurs, It is necessary to make this cable penetration part a fireproof structure.

As a fireproof structure for a cable penetrating portion for this purpose, conventionally, a pair of flat plate members each having a split shape are laminated and surrounded by a cable penetrating through a through hole of a floor wall above the through hole. It is known that the outer periphery of the laminated flat plate member is fixed with a tightening tool while the putty seal material is filled inside (for example, Japanese Utility Model Publication No. 57-2849).
No. 6 publication).

On the other hand, the above-mentioned one is intended for a single cable even though it is a high-voltage and large-capacity cable, and in a recent office building or the like, a large number of various types and a large number of cables are accommodated in a cable rack to form a partition wall. Since it is unsuitable for a wall opening having a large opening for arranging, for example, the through holes, a fireproof structure as shown in FIGS. 7 and 8 is generally adopted in such a case. That is, in the wall through hole 102 that penetrates through the concrete partition wall 101, a large number of cables 104 housed in the cable rack 103,
.. are arranged so as to penetrate the wall through-hole 102 together with the cable rack 103, and the openings 102a and 102b on both sides of the wall through-hole 102 are divided into upper and lower parts (see FIG. 8). It is shielded by a pair of fire-resistant partition plates 105, 105. At that time, the rock wool 106 is filled between the inner peripheral surface of the wall through hole 102 and each of the cables 104 and the cable rack 103 at a predetermined density, and the pair of partition plates 10 on both sides.
5, 105, the inner peripheral surface of the cable through hole 107, the cables 104, and the cable rack 103.
The fireproof putty 108 is filled and sealed so as to swell in the gap between the fireproof putty 108 and the fireproof putty 108, thereby performing fireproofing treatment. Note that 109 is an anchor bolt, and the partition plates 105 are fixed to the partition wall 101 by the anchor bolts 109.

In the fireproof structure of the office building or the like, a large number of cables 104, 104, ... Stored in the cable rack 103 are arranged in the vertical direction as shown in FIG. Normally, an electric pipe shaft (EPS; hereinafter simply referred to as EPS) 110
The floor walls 11 of the EPS 110 are centrally located in the
After being installed on each floor through the first partition 1, the partition wall 113 that partitions the room 112 on each floor and the EPS 110 is installed. Each floor wall 111 and partition wall 11
The above-mentioned fire prevention treatment is applied to a portion penetrating the hole 3.

[0006]

However, since the laying work of the cable and the like is usually performed during or after the construction work of the refractory structure, at this stage,
It is often the case that a makeup middle ceiling 114 is already hung on the floor wall 111 on the upper floor in the room 112 on each floor, and in this case, the presence of this middle ceiling 114 makes the room 11
It becomes extremely difficult to perform fire prevention processing on the wall through hole 102 from the second side. That is, the middle ceiling 114 and the floor wall 111 on the upper floor.
The space between and is usually extremely narrow, and it is extremely difficult or impossible to fix the partition plates 105 of FIG. 7 and install the fireproof putty 108 from the chamber 112 side in this narrow space. May be. In this case, the inner ceiling 114 is partially removed to deal with it, but the work for this is troublesome, and the construction period,
It becomes impossible to use the chamber 112. in addition,
Once the cables have been installed and fire protection has been applied, the expansion of electronic information devices, etc. requires additional wiring such as additional wiring of power cables or replacement with larger capacity cables. , Each time, the above-mentioned inner ceiling 114
It is necessary to remove it for construction. Therefore, there is a demand for the development of a fireproof structure capable of performing fireproofing only from the EPS 110 side.

Further, in the fireproof structure shown in FIG.
There are the following inconveniences. That is, the above rock wool 1
06 to satisfy a predetermined fire resistance performance (for example, 2 hours fire resistance performance), a predetermined packing density (for example, 200 kg /
m3) needs to be filled, but since the work is manual work on site, the filling work requires skill and it is difficult to control the filling density. Moreover, since the rock wool 106 is a fine fiber like asbestos (asbestos), it is not preferable in terms of occupational health and safety to handle it in a narrow space. In addition, in the above-described work of filling the fireproof putty 108 and forming it into a heap, the cable rack 103 may be peeled off or dropped off if it is shaped too thick on the lower side, not on the upper side.

Further, when the above-mentioned additional construction is carried out,
It is necessary to remove all of the partition plates 105, the fireproof putty 108, the rock wool 106, etc. shown in FIG. 7 and perform the same fireproofing process again, and these operations require a great deal of work as described above. become.

The present invention has been made in view of the above circumstances, and an object of the present invention is to carry out a fireproofing process from one side of a wall for a penetration portion of a large number of cables to be housed in a cable rack. (EN) It is possible to provide a fireproof structure that can be done only by itself and can easily perform an extension work after fireproofing.

[0010]

In order to achieve the above object, the invention according to claim 1 penetrates a partition wall or a floor wall of a structure in a state where a plurality of cables are accommodated in a cable rack. It is premised on a fireproof structure which is arranged through the wall through hole and in which a gap between the outer periphery of the plurality of cables and cable racks and the opening of the wall through hole is shielded by a fire resistant partition plate. In this, the outer periphery of the plurality of cables and the cable rack is provided with a fireproof putty coating portion that covers the outer side in the longitudinal direction of the cable from one side opening of the wall through hole, and this fire putty coating portion is provided. A pair of fireproof shield plates sandwich and shield the cables from both sides in the direction orthogonal to the longitudinal direction. Further, at least a pair of fixing means for detachably fixing the pair of shielding plates to the cable rack independently of each other is provided.

According to a second aspect of the present invention, in the first aspect of the invention, the cable rack is provided on both sides in a direction orthogonal to the longitudinal direction of the cable and orthogonal to the opposing directions of the pair of shield plates. A pair of groove frame members arranged at positions and connected to each other in a state of being opposed to each other is formed to have a substantially groove-shaped cross section. Then, the pair of shield plates are formed in a flat plate shape, and the plurality of cables between the pair of groove frame members are sandwiched by the pair of shield plates via the fireproof putty coating portion.

Further, the invention according to claim 3 is the same as claim 1.
In the invention described above, a pair of grooves that are connected to each other in a state in which the cable rack is disposed at both side positions in a direction orthogonal to the longitudinal direction of the cable and orthogonal to the opposite directions of the pair of shielding plates. The frame member is formed to have a substantially groove-shaped cross section. Then, the fixing means is arranged so as to abut the outer surface of the shield plate so as to straddle the pair of groove frame members, and a hook for releasably engaging the head portion with the end edge portions of the groove frame members. And a pair of hook-shaped bolts for fixing both ends of the support fitting to the edge portions of the groove frame members.

[0013]

According to the above-mentioned structure, according to the first aspect of the present invention,
The cables and cable racks that are arranged through the wall through-holes are covered with the fire-proof putty coating part from the opening on one side to the outside in the longitudinal direction of the cable to be insulated, and the fire-proof putty coating part is sandwiched by a pair of shielding plates. Since it is sandwiched between and is cut off from flames, it is possible to prevent the spread of fire through the cable and the suppression of heat transfer at one side of the partition wall or the floor wall where the wall through hole is sandwiched. Further, since the passage of the flame through the gap between the wall through hole and the cable or the like is blocked by the partition plate provided in the opening on one side, the large-scale cable that must be supported by the cable rack. Fire protection can be performed only from one side of the bulkhead or floor wall to the cable opening of the large opening through which the group penetrates.Compared with the conventional fire prevention structure in which the work required for fire protection is performed from both sides of the bulkhead, etc. It will be significantly easier. At the same time, it becomes possible to omit the rock wool, which was required in the conventional fireproof structure, and the problem of occupational safety and health associated with the use of rock wool is solved.

Further, since the pair of shield plates are detachably fixed to the cable rack independently of each other by the fixing means, it is possible to add or replace the cables in the future after the fire prevention treatment when performing an additional construction. In addition, the cable can be added by removing only one shield plate on the side where the cable is added. For this reason, the work can be saved, and the above work can be performed while the other side of the shield plate is kept fixed and the fire protection structure is supported overall. It becomes possible to do.

In addition, in the invention described in claim 2, in addition to the operation according to the invention described in claim 1, a plurality of cables in the cable rack are provided with a pair of shield plates and a pair of groove frame members of the cable rack. And the cable is sandwiched by the pair of shielding plates through the fireproof putty coating part and the enclosed internal space is filled with the fireproof putty coating part. become. For this reason, the heat insulation and flame insulation of the plurality of cables from the heat of fire are more effectively performed.

Further, in the invention described in claim 3, in addition to the operation according to the invention described in claim 1, since the fixing means is composed of the support fitting and the pair of hook-shaped bolts,
By locking the hook portion of the hook-shaped bolt to the end edge of each groove frame member of the cable rack, each shield plate can be independently fixed in position with respect to the cable rack, while loosening the hook-shaped bolt. When the locking is released, the shielding plates can be easily removed from the cable rack. As a result, the fixing means according to claim 1 is easily configured, and both shield plates can be reliably and independently attached and detached.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIGS. 1 to 3 show a fireproof structure of a cable penetrating portion according to a first embodiment of the present invention. In the first embodiment, the cable group is a fireproof structure such as an office building. The present invention is applied to a cable penetration portion that horizontally penetrates the partition wall.

In the figure, reference numeral 1 is a wall through hole, and the wall through hole 1 has a rectangular cross section of a predetermined size and is formed so as to horizontally penetrate through a concrete partition wall 2.
.. are a large number of cables of the same type or different types, and the large number of cables 3, 3, ... Are arranged so as to pass through the wall through hole 1 while being accommodated in the cable rack 4. ing. Reference numerals 5 and 5 are a pair of refractory shield plates, and each shield plate 5 has an opening 1a on one side of the wall through hole 1.
Are arranged so as to sandwich the cables 3 on the side from above and below, and are fixed to the cable rack 4 in a detachable manner by fixing means 6 and 6. Further, 7 is a fire-resistant partition plate divided into two parts, and 8 is a fireproof putty-coated portion. Hereinafter, each component will be described in detail.

The cable rack 4 has a pair of metal groove frames facing each other in the left-right direction which is a direction orthogonal to the longitudinal direction of the cables 3, 3, ... (For convenience of description, hereinafter referred to as the front-back direction). The members 9, 9 and a plurality of crosspiece members 10, which are bridged between the groove frame members 9, 9 at predetermined intervals in the front-rear direction to connect the groove frame members 9, 9 to each other.
It is formed from 10, ... As shown in detail in FIG. 4, the groove frame member 9 is formed of a substantially groove-shaped profile member having upper and lower flange portions 9a and 9b. The cables 3, 3, ... Are placed in a stacked state on the rail members 10 between the groove frame members 9, 9 and fixed to the rail members 10 at appropriate positions to fix the cable rack. It is housed in 4.

Each of the shielding plates 5 is formed of calcium silicate into a flat plate having a predetermined thickness, and has a width in the left-right direction that shields between the pair of groove frame members 9 of the cable rack 4,
A length that protrudes outward from a position slightly inward of the opening 1a on one side of the wall through-hole 1 and shields the cables 3, 3, ... In a predetermined front-rear direction range (for example, 200 mm in the case of 2-hour fire resistance performance). ) And have. As a result, each of the shielding plates 5 plays a role of blocking flame when a fire occurs.

The fixing means 6 penetrates the beam-shaped supporting metal fitting 11 which is in contact with the outer surface of each of the shielding plates 5 and extends between the groove frame members 9, and both ends of the supporting metal fitting 11. A pair of hook-shaped bolts 12, 12 constitutes one set. Two sets of front and rear fixing means 6 are provided for each of the upper and lower shield plates 5, and two sets of upper and lower fixing means are provided so that hook-like bolts 12 projecting vertically from each other are adjacent to each other in the front-rear direction. 6, 6 are arranged with a slight shift in the front-rear direction. Then, the hook portion 12a of each hook-shaped bolt 12 of the upper two sets of fixing means 6 and 6
(See FIG. 4) is locked by the lower flange portion 9b of each groove frame member 9 and is tightened by the nut 12b to fix the upper shield plate 5 in position with respect to the cable rack 4, and Each hook-shaped bolt 1 of two sets of fixing means 6 and 6
The second hook portion 12a is locked by the upper flange portion 9a of each groove frame member 9 and is tightened by the nut 12b so that the lower shield plate 5 is positionally fixed to the cable rack 4. There is. That is, the upper and lower shield plates 5 and 5 are fixed to the cable rack 4 independently and detachably via the upper and lower two sets of fixing means 6 and 6, respectively. Further, by tightening the nuts 12b described above, a fireproof putty portion 8a, which will be described later, is pressed to bring the shielding plates 5 into close contact with the fireproof putty portion 8a.

The partition plate 7 is formed of calcium silicate into a flat plate having a predetermined thickness and is composed of a pair of half-split partition plates 7a, 7a which are vertically divided into two half-split partition plates 7a. , 7a are fixed to the partition wall 2 by a plurality of anchor bolts 13, 13 ,. A cable through hole 7b is formed between the boundary surfaces of the two half partition plates 7a, 7a, and the cable through hole 7b is formed.
, The cable rack 4, the pair of shield plates 5, 5 and the like are surrounded from the outer periphery by the two half-divided partition plates 7a, 7a to shield the opening 1a on one side of the wall through hole 1 It is supposed to do. That is, the partition plate 7 plays a role of blocking the flame that extends to the adjacent chamber with the partition wall 2 sandwiched from the gap between the cables 3, 3, ... In the one side opening 1a of the wall through hole 1. Has become.

The fireproof putty-coated portion 8 is formed by the both shield plates 5.
Between the upper and lower surfaces of the cables 3, 3, ... In the cable rack 4 and the fire-proof putty portion 8a for covering the cables 3, 3 ,. Fire putty portion 8b covering the outer surface of each groove frame member 9 between the upper and lower portions of the portion
A fireproof putty portion 8c for filling an annular gap between the fireproof putty portion 8b, the shielding plates 5 and 5 and the inner peripheral surface of the cable through hole 7b, the partition plate 7 and the one side opening portion 1a Fireproof putty part 8 interposed between the wall surface 2a of the partition wall 2
It consists of d and.

The fireproof putty portion 8a is located in the range between the pair of groove frame members 9 of the cable rack 4 in the left-right direction, and in the front-rear direction in the front-rear range covered by the shield plates 5, 3, 3. ,… Has a certain thickness on the upper and lower surfaces (eg 5 mm
(Thickness) or more, and the fireproof putty is filled in the range between the left and right groove frame members 9, 9 and between the upper and lower shield plates 5, 5. At this time, the fireproof putty portion 8a is
It is preferable that not only the surface of each of the cables 3 described above but also all the spaces of the slits such as valleys between the cables 3 are filled so as to be filled.

The fireproof putty portion 8b is formed by coating so as to cover the outer surface of each groove frame member 9 with a predetermined thickness across a predetermined range on both sides in the front-rear direction with the partition plate 7 interposed therebetween.

A taper surface 7c (see FIG. 2) is formed on the inner peripheral surface of the cable through hole 7b in which the fireproof putty portion 8c is disposed. The taper surface 7c and the shielding plates 5 are formed.
Between the outer surface and the outer surface of the fireproof putty portion 8b, a small wedge-shaped filling gap is formed on the side of the wall through hole 1 and a large portion on the outer side, and the fireproof putty from the one side opening portion 1a side is formed. The filling is facilitated.

The fire-proof putty portion 8d prevents smoke from leaking through the boundary surface between the wall surface 2a of the partition wall 2 and the partition plate 7, and the partition plate 7 against the wall surface 2a.
It is provided in order to protect the partition plate 7 by playing a role of a cushion material when fixing the partition plate.

As the fireproof putty used to form such a fireproof putty coated portion 8, there is the following non-foaming putty or foaming putty. As the non-foaming putty, a flame retardant is mixed and dispersed in a liquid binder at room temperature such as polybutene, silicone oil, liquid paraffin, and liquid chloroprene polymer, and has an oxygen index of 50 or more, particularly 6 or less.
0 or more is used. Examples of the flame retardant include halogen-containing organic flame retardants such as decapromodiphenyl oxide and hexapromobenzene, metal oxides such as antimony trioxide, or alumina hydrate, magnesia hydrate,
One or more hydrated metal oxides such as basic magnesium sulfate hydrate, basic magnesium carbonate hydrate and basic magnesium phosphate hydrate are used. It is preferable to use one kind or two or more kinds.
Specific examples of the above non-foaming putty include Japanese Patent Publication No. 63-4.
Examples include liquid chloroprene described in JP-A No. 60, JP-A-56-106935 and the like, with an inorganic filler, heat-resistant fibers and the like added as necessary.

The foaming putty includes hydrocarbon polyhydric alcohols such as pentaerythritol, melamine,
A composition in which a foaming material such as dicyandiamide and a flame retardant dehydrating agent such as ammonium polyphosphate are mixed and dispersed in a liquid binder such as polybutene or liquid paraffin at room temperature is used. As an example of such an effervescent putty, Japanese Patent Publication No.
There are those disclosed in Japanese Patent Publication No. 5-33795, Japanese Patent Publication No. 53-39190, and the like. The above-mentioned "foamable putty" is a general term for materials that pyrolyze themselves to form foamed carbide when heated to a high temperature.

In the first embodiment having the above-described structure, a large number of cables 3, 3, ... Penetrating the wall through-hole 1 are covered by a pair of shield plates 5, 5 in the vertical direction over a predetermined range in the front-back direction. The left and right directions are covered by the pair of groove frame members 9, 9 of the cable rack 4, respectively, and the upper, lower, left and right sides are shielded from flame, and these 5, 5, 9, 9 and the cables 3, 3 ,. A fire-proof putty portion 8a in which the fire-proof putty is filled is formed in all of the spaces between them, and is in a heat-insulated state. Moreover, the outer surface of each groove frame member 9 is covered with the fire-proof putty portion 8b. It is insulated. Therefore, when a fire occurs, it is possible to effectively prevent the spread of fire by burning the covering material of the cables 3 and to interrupt the heat conduction of the fire heat through the cables 3.

Further, the partition plate 7 can block the flame at the opening 1a on one side of the wall through hole 1, and the flame can be reliably prevented from reaching the adjacent chamber through the wall through hole 1. In addition, the fireproof putty section 8c
A gap is sealed between the cable through hole 7b and a large number of cables 3, 3, ... Integral with the pair of shielding plates 5, 5, etc., and the partition plate 7 and the wall surface 2a are protected by the fireproof putty portion 8d. Since the joint surface between the and is sealed, it is possible to reliably prevent flame and smoke from entering the adjacent chamber.

Therefore, even for the large-diameter wall through hole 1 through which the large-scale cable group consisting of a large number of cables 3, 3, ... Which must be supported by the cable rack 4 penetrates the partition wall 2. With the fireproof structure on only one side of the partition wall 2, sufficient fireproof performance can be exhibited, and the spread of fire to the adjacent chamber via the cable penetrating portion can be reliably prevented.

On the other hand, according to the first embodiment, even the large-diameter wall through-hole 1 as described above can be fire-proofed by the work only from one side of the wall-through hole 1 of the partition wall 2. As compared with the conventional fireproof structure that requires work from both sides of the partition wall 101 shown in FIG. 7 and the like, the work can be performed extremely easily. Especially in the case as shown in FIG.
Since the work can be done only from the PS110 side, regardless of whether the fireproof structure is in the middle of construction or after construction,
The work can be performed even after the interior decoration of the middle ceiling 114 or the like is performed, and the work is subject to time restrictions in relation to the construction process and space restrictions due to the middle ceiling 114 or the like. Can be performed easily and surely. In addition, since the rock wool, which was required in the above-mentioned conventional structure, is unnecessary and can be omitted, the troublesome filling density management can be omitted, and the work can be further facilitated. It is possible to maintain a clean environment, and it is possible to solve the problem of occupational safety and health due to work in a dusty environment in which rock wool fibers and the like are scattered in the conventional structure.

Further, since the upper and lower shield plates 5 and 5 are fixed to the cable rack 4 independently of each other and in a detachable manner, it is possible to perform future expansion work after the fireproofing work. The extension work can be performed extremely easily as compared with the case of the above conventional structure. That is, when it is necessary to perform additional construction such as addition or replacement of cables, the two sets of fixing means 6 and 6 that fix the upper shielding plate 5 are fixed.
The upper shield plate 5 can be removed by loosening the nuts 12b of the above and removing the hook portion 12a of each hook-shaped bolt 12 from the lower flange portion 9b of the groove frame member 9. Then, the relevant portion of the fireproof putty portion 8a on the upper side of each cable 3 is peeled off, and cables are added. afterwards,
The fire-proof putty portion 8a of the peeled-off portion or a new fire-proof putty is filled and fixed by covering with the upper shield plate 5, and the fire-proof putty portion 8b, 8c, 8d of the portion damaged by this work.
It is completed by repairing. If necessary, the upper half partition plate 7a may also be removed.
In this way, additional work can be performed by removing only the upper shield plate 5 and the upper portion of the fireproof putty portion 8a.
Moreover, during that time, the lower shield plate 5 is maintained in the fixed state by the two lower fixing means 6 and 6, and at least the lower half partition plate 7a is kept in the fixed state.
The entire fire protection structure is supported, and it is not necessary to support the large-scale cable group in the cable rack 4 by some other means. Therefore, in combination with the fact that the processing can be performed only on one side, the expansion work can be greatly facilitated.

Further, in the fireproof putty coating portion 8, a fireproof putty portion 8a for covering the large number of cables 3, 3, ... Is sandwiched by a pair of shielding plates 5 and 5 from above and below, and the fireproof putty portion 8a is provided. Among them, especially the lower surface side portions of the cables 3, 3, ... Are supported from below. Therefore, even if the filling and coating of the fireproof putty on the lower surface side portion is made considerably thick, the fireproof putty portion 8a can be held in the thick state, and the lower surface side portion of the fireproof putty portion 8a after the filling work is removed. Or, especially,
It is possible to surely prevent the occurrence of dropping or the like when a fire occurs, and it is possible to reliably maintain the large number of cables 3, 3, ... Insulated.

<Second Embodiment> FIGS. 5 and 6 show a fire preventive structure for a cable penetrating portion according to a second embodiment of the present invention. The second embodiment shows a large number of cables housed in a cable rack 4. The present invention is applied to a cable penetrating portion in which a cable group consisting of 3, 3, ... Penetrates vertically through the floor wall 21 of the fireproof structure. The second embodiment is different from the first embodiment mainly in that the directions of the cables 3 and the cable rack 4 are changed from horizontal to vertical, and the overall configuration is the same as that of the first embodiment. It is almost the same as the example.

In the figure, 22 is a wall through hole that vertically penetrates through the concrete floor wall 21, 23 is a refractory partition plate made of calcium silicate, and 24 and 24 are also made of calcium silicate. A pair of fireproof shielding plates, and 25 are fireproof putty coating parts.

The partition plate 23 is formed to have substantially the same shape as that of the first embodiment, and the partition plate 23 sandwiches the cables 3, 3, ... And the cable rack 4 in the front-rear direction (the left-right direction in FIGS. 5 and 6). A pair of half-divided partition plates 23a, 23a
It is composed of These two half partition plates 23a, 2
3a are fixed to the upper surface 21a of the floor wall 21 by a plurality of anchor bolts 26, 26, ... While facing each other from the front and rear, whereby the two half partition plates 23 are provided.
, and the cable rack 4 penetrate through the cable through hole 23b formed between the joint surfaces of the a and 23a, and the upper side opening of the wall through hole 22 in a state of enclosing these 3 and 4 from the outer periphery. The portion 22a is shielded.

The pair of shield plates 24, 24 are located above the partition plate 23, and the cable rack 4 is sandwiched from the front and rear by sandwiching the cables 3, 3 ,. Both shield plates 2 are extended and arranged.
4, 24 are independently fixed to the cable rack 4 by two sets of fixing means 6, 6 so as to be attachable to and detachable from the cable rack 4 as in the first embodiment.

The fireproof putty coating portion 25 includes the shield plates 24, 24 and the cables 3, 3, ... In the cable rack 4.
The cable 3, which is buried in the gap between the front and rear surfaces of
A fireproof putty portion 25a for covering 3, ...
Fireproof putty portion 25b covering the outer surface of each groove frame member 9 between 24
(See FIG. 6) and the fireproof putty portion 25c for filling an annular gap between the fireproof putty portion 25b and the shielding plates 24, 24 and the inner peripheral tapered surface 23c of the cable through hole 23b.
And a fireproof putty portion 25d interposed between the partition plate 23 and the upper surface 21a of the floor wall 21 around the upper opening 22a.
Consists of Each of these fire putty parts 25a, 25b, 25
c and 25d are the fireproof putty parts 8 of the first embodiment, respectively.
The fireproof putty is filled in the same manner as a, 8b, 8c, 8d, but in the second embodiment, the fireproof putty portion 25a between the pair of shield plates 24, 24 and the fireproof putty on the inner peripheral side of the cable through hole 23b. The putty portion 25c is formed continuously with each other.

The other configurations of the second embodiment are the same as those of the first embodiment.
Since it is similar to that of the embodiment, the same members are designated by the same reference numerals and the description thereof is omitted.

Also in the case of the second embodiment, a large number of cables 3, 3, ...
A pair of shield plates 24, 24 over a predetermined range in the vertical direction
And a pair of groove frame members 9 and 9 of the cable rack 4 block the flame from all sides, and a fire-proof putty portion 25a in which all of the internal voids are filled with fire-proof putty is formed and insulated. In addition, the outer surface of each groove frame member 9 is covered with the fireproof putty portion 25b and is in a heat-insulated state. Therefore, when a fire occurs, it is possible to effectively prevent the spread of fire by burning the covering material of the cables 3 and to interrupt the heat conduction of the fire heat through the cables 3.

Further, the partition plate 23 can block flame at the upper opening 22a of the wall through hole 22,
It is possible to reliably prevent the flame from reaching the upper floor through the wall through hole 22. In addition, the fireproof putty section 25
c, the cable through hole 23b and a large number of cables 3,
The gap between 3 and ... is sealed, and the fireproof putty 2
Since 5d seals the joint surface between the partition plate 23 and the floor upper surface 21a, it is possible to reliably prevent flame and smoke from entering the upper floor.

Therefore, as in the first embodiment, a large opening through which the large-scale cable group consisting of a large number of cables 3, 3, ... Which must be supported by the cable rack 4 penetrates the floor wall 21. Sufficient fire resistance can be exhibited even in the wall through hole 22 of the above, and the spread of fire to the upper floor through the cable penetrating portion can be reliably prevented.

On the other hand, also in the second embodiment, since the fire prevention treatment can be applied to the above-mentioned large-diameter wall through-hole 1 only from above the floor, the work is performed from above and below the floor. The work can be performed extremely easily as compared with the conventional fire protection structure which is required. The effect of eliminating the rock wool, which is required in the conventional structure, can be obtained as in the first embodiment.

Further, since the front and rear shield plates 24, 24 are fixed to the cable rack 4 independently of each other and by the fixing means 6 so as to be attachable and detachable, the fire protection is also performed in the second embodiment. In the case where future expansion work is performed after the construction of the treatment, the expansion work can be greatly facilitated as in the first embodiment.

Further, a fireproof putty portion 25a which covers the front and rear sides of the large number of cables 3, 3, ...
Is sandwiched and supported by the pair of shielding plates 24, 24, the fire-proof putty portion 25a can be reliably held and maintained even if the fire-proof putty is relatively thickly filled and applied.

<Other Embodiments> The present invention is not limited to the above-mentioned first or second embodiment, but includes various other modifications. That is, in the above-mentioned first and second embodiments, the fireproof shield plates 5, 24 and the partition plates 7, 23 are formed of calcium silicate, but the invention is not limited to this, and is formed of a non-combustible material such as a metal plate. You may.

Further, in the first and second embodiments, the fixing means 6 for fixing the positions of the shielding plates 5 and 24 are constituted by the support fitting 11 and the pair of hook-shaped bolts 12 and 12, and each of the cable racks 4 is provided. The flange portion 9a or 9 of the groove frame member 9
Although the hook portion 12a of each hook-shaped bolt 12 is locked to b, the invention is not limited to this, and the shield plates 5 and 2 are not limited to this.
Other configurations may be used as long as they can detachably fix the position of the cable 4 to the cable rack 4 independently, and the following example of the mode may be used. For example, instead of the hook-shaped bolt 12 described above, a combination of a simple bolt penetrating the support fitting and a nut fixed at an appropriate position of the cable rack is used. Further, in this example, the support fitting is omitted and a hole is formed in the shielding plate, and the above-mentioned simple bolt is passed through this. On the contrary, the fixing means is composed of the bolt fixed to the cable rack side and the nut for tightening the bolt penetrating the shield plate or the support fitting.

Further, the above-mentioned fixing means 6 or the fixing means of another mode is provided one for each shield 5, 24,
The fire protection structure may be configured by providing a pair of upper and lower parts.

[0052]

As described above, according to the fire prevention structure for the cable penetrating portion in the invention described in claim 1, the cable and the cable rack penetratingly arranged in the wall penetrating hole are shielded by the partition plate on one side opening. Section and the outside of the cable in the longitudinal direction, it is covered with a fireproof putty coating to insulate it, and the fireproof putty coating is sandwiched between a pair of shielding plates to shield it from flames. It is possible to prevent the spread of fire through the cable and the suppression of heat transfer at one side portion of the wall sandwiching the wall through hole. For this reason, for the cable penetration part of the large opening through which the large-scale cable group that must be supported by the cable rack can be applied, fire protection can be performed only by work from one side of the partition wall or floor wall, Compared with the conventional fireproof structure that requires work from both sides of the partition wall or the like, the work required for fireproofing can be greatly facilitated. At the same time, it is possible to omit the rockwool that was required in the conventional fireproof structure, and it is possible to solve the problem of occupational safety and health associated with the use of rockwool, and the fireproof putty coating part is supported by each shielding plate. Even if the fire-proof putty is relatively thickly filled and applied, the fire-proof putty can be reliably maintained and the above-described work can be facilitated.

Further, since the pair of shielding plates are detachably fixed to the cable rack independently of each other by the fixing means, additional work such as addition or replacement of cables in the future after fire prevention treatment can be performed. When doing this, it is possible to add the above cables, etc. by removing only one shield plate on the side to be added, which saves work and also keeps the shield plate on the other side fixed. Since the above-described work can be performed while the fireproof structure is supported as a whole, the work can be reliably performed.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, a plurality of cables in the cable rack are connected to a pair of shield plates and a pair of groove frames of the cable rack. It can be surrounded from all sides by a member, and the cable is sandwiched by the pair of shielding plates via the fire-proof putty-coating part to fill the enclosed internal space with the fire-proof putty-coating part. Can be put into Therefore, it is possible to more effectively insulate the plurality of cables from fire heat and block the flame.

Further, in the invention described in claim 3, in addition to the operation according to the invention described in claim 1, since the fixing means is composed of the support fitting and the pair of hook-shaped bolts, the hook-shaped bolts are provided. By engaging and disengaging the hook part of the cable rack and the edge of each groove frame member of the cable rack, both shield plates can be securely and independently fixed, and only one shield plate can be easily removed. Therefore, it is possible to surely realize the facilitation of the extension work according to the invention of claim 1.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the one shown in FIG.

3 is a sectional view taken along line AA in FIG. 2 on the right side of the center line, and a left side is a sectional view taken along line BB in FIG.

FIG. 4 is an enlarged cross-sectional view showing a relationship between a fixing means and a cable rack in a state where a cable and a fireproof putty portion are omitted.

FIG. 5 is a vertical sectional view of a second embodiment.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a vertical sectional view showing a conventional fireproof structure.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a vertical cross-sectional view showing an example of a refractory structure.

[Explanation of symbols]

 1, 22 Wall through hole 1a Opening on one side 2 Partition wall 3 Cable 4 Cable rack 5,24 Fireproof shield plate 6 Fixing means 7,23 Fireproof partition plate 8,25 Fireproof putty coating part 8a, 25a Fireproof putty part (fireproof Putty coating part 9 Groove frame members 9a, 9b Flange part (end edge part) 11 Support metal fitting 12 Hook bolt 12a Hook part 21 Floor wall 22a Upper opening (one side opening)

Claims (3)

[Claims] 1. A plurality of cables, which are accommodated in a cable rack, are arranged through a wall through hole that penetrates a partition wall or a floor wall of a structure, and the plurality of cables and the outer periphery of the cable rack and the outer periphery of the cable rack. In the fire prevention structure of the cable penetration part in which the gap between the opening of the wall penetration hole is shielded by a fire-resistant partition plate, the outer periphery of the plurality of cables and the cable rack is from the one side opening of the wall penetration hole to the above. A fire-proof putty-coated portion covering the outer side in the longitudinal direction of the cable, a pair of fire-resistant shield plates sandwiching the fire-proof putty-coated portion from both sides in the direction orthogonal to the longitudinal direction of the cable, and the pair of shields. A fireproof structure for a cable penetrating portion, comprising at least a pair of fixing means for detachably fixing the plates to the cable rack in a detachable manner. 2. The cable rack according to claim 1, wherein the cable racks are arranged at both side positions in a direction orthogonal to the longitudinal direction of the cable and orthogonal to the opposite directions of the pair of shielding plates, and are connected to each other in an opposed state. The cross-sectional shape is formed in a substantially groove shape by the pair of groove frame members, and the pair of shield plates are formed in a flat plate shape, and the pair of shield plates form a plurality of cables between the pair of groove frame members. The fireproof structure of the cable penetration part, characterized in that is sandwiched by the fireproof putty coating part. 3. The cable rack according to claim 1, wherein the cable racks are arranged at both side positions in a direction orthogonal to the longitudinal direction of the cable and orthogonal to the opposite directions of the pair of shield plates, and are connected to each other in an opposed state. The cross-sectional shape is formed into a substantially groove shape by the pair of grooved frame members, and the fixing means includes a support metal fitting which is in contact with the outer surface of the shielding plate and extends between the paired grooved frame members, and a head. A hook portion that releasably engages with the end edge portion of each groove frame member, and a pair of hook-shaped bolts that fix both ends of the support fitting to the end edge portion of each groove frame member. Fire protection structure for cable penetrations characterized by being configured.