JP2732228B2 - Fire prevention structure at cable wall penetration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire prevention structure at a cable wall penetration portion in which a cable passes horizontally through a fire protection partition wall of a power plant, a large factory, an office building, or the like. The present invention relates to a fire prevention structure in a case where the fire prevention structure is disposed and penetrates a lowermost position of a fire prevention partition wall.

[0002]

2. Description of the Related Art Heretofore, as a fire prevention structure when a cable passes horizontally through a fire protection partition wall, a non-combustible fiber is filled in a cable through hole in which the cable is penetrated, and the end of the cable through hole is provided. In addition, there is known a structure in which a partition wall that blocks in the longitudinal direction of a cable and a portion filled with a flame-resistant sealing material are formed (for example, see Japanese Utility Model Publication No. 62-11137). In this case, the cable through-hole is formed by a cylindrical body that is fixed by penetrating the wall, and the cable is disposed through the cylindrical body. Then, a non-combustible fiber is densely filled in a gap between the cable and the inner peripheral surface of the cable through-hole, and the cable surrounds the cable at one end of a cylindrical body constituting the cable through-hole. A protruding split cover member is attached and, among the gaps between the cable and the inside of the cover member, a portion of the cable in the longitudinal direction is filled with a curable resin to form the partition wall, while the other gap portion is formed. Filled with flame resistant sealant to ensure fire protection.

On the other hand, for example, a groove-shaped concave portion (wiring pit) for cable wiring is provided on the upper surface of a floor, and a cable arranged along the bottom surface of the wiring pit penetrates a fire protection partition wall. Is located along the floor upper surface and penetrates the fire protection partition wall, the position of the cable through hole is the lowest position of the fire protection partition wall, and it becomes difficult to fix the above-mentioned cylindrical body. A fire protection structure as shown in FIGS. 6 and 7 is employed. That is, a wiring pit 53 having a rectangular cross section is formed on the concrete floor 51 for wiring the cable 52, and a partition wall 54 is formed on the upper surface of the concrete floor 51 as a fire protection partition wall. Cable 5 by wiring pit part
A through-hole 55 through which the wire 2 passes is formed. That is, the bottom surfaces 53a, 55a and both side walls 53b, 55b of the wiring pit 53 and the through hole 55 are flush with each other, and
A cable 52 is arranged on 5a. The through-hole 55 is filled with rock wool 56 as non-combustible fiber, and a pair of refractory partition plates 57, 57 are provided at both sides of the through-hole 55 so as to sandwich the rock wool 56 from both sides.
Are fixed, and the gaps between the partition plates 57 and the cables 52 and the like are sealed by the fireproof seal material 58, so that the openings on both sides of the through holes 55 are shielded. in this case,
Side walls 53b, 55b of through hole 55 and wiring pit 53
Are not flush with each other as described above and cannot be fixed by spanning the partition plates 57 over the wall surface 54a of the partition wall 54. Therefore, a plurality of support members made of an angle material are provided on both side wall surfaces 55b and 55b of the through hole 55. The metal fittings 59, 59 are anchor-fixed, and the partition plates 5 are fixed to the supporting metal fittings 59, 59.
7 is fixed.

[0004] The simplest example of a cable penetrating portion in which the cable passes through the lowermost position of the fire compartment wall is a cable arranged along a floor of a fire compartment floor.
The cable may pass through a through hole formed at the base of the partition wall with the concrete floor slab and flush with the floor surface. Furthermore, in recent years, from the viewpoint of preventing the propagation of impact noise downstairs, a separate upper floor is provided above the concrete slab to form a double floor structure, and the underfloor space of the upper floor is used as a wiring place for cables. Also in this case, the cable is routed along the upper surface of the concrete floor slab, and penetrates the partition wall at the base position below the upper floor with the concrete floor slab. In these cases, the same fire prevention structure as that shown in FIG. 6 and the like is used.

[0005]

However, FIG.
In the conventional fire prevention structure for a cable wall penetration part shown in FIG. 2, it is necessary to perform a fire prevention process for forming the fire prevention structure in a relatively narrow wiring pit 53, so that the entire processing work becomes difficult. . In addition, since it is not possible to use a simple fixing means of using the wall surface of the partition wall 54 when fixing each partition plate 57, a plurality of support fittings 57, 57,. Extra work is required in advance, and this anchor bolting work must be performed in the above-mentioned narrow space, which makes the processing work more difficult.

The difficulty of such a processing operation tends to increase as the depth of the wiring pits 53 becomes shallower because the height of the through hole becomes lower. In the case where the cable arranged along the floor of the fire prevention compartment floor penetrates the through hole formed flush with the floor surface at the base position of the partition wall with the concrete floor slab, not limited to the case where it is wired Occurs similarly. Similarly, even in the case of the above-mentioned double floor structure, the above-described processing work must be performed in a narrow underfloor space divided into upper and lower sections by a concrete slab and an upper floor section, and the processing work is difficult. In addition, since the vertical position of the upper floor portion is made as low as possible to secure the height of the indoor space, the vertical space of the above-mentioned underfloor space becomes small, and accordingly the vertical space of the through hole becomes small, and the processing work Difficulty increases.

[0007] In the fire prevention structure shown in FIG.
In order to satisfy a predetermined fire resistance (for example, fire resistance for 2 hours), the rock wool 56 is filled with a predetermined packing density (for example,
200 kg / m 3) must be filled, but since the work is manual work in the above-mentioned narrow space, it is difficult to control the packing density. In addition, the rock wool 56 has a fine fibrous form similar to asbestos (asbestos). Therefore, the fibers are scattered in the above-mentioned narrow space, resulting in an unfavorable environment in terms of occupational safety and health. In order to solve this problem, it is conceivable to fill with a putty-like fireproof seal material instead of filling with the rock wool 56 and omit the filling with the rock wool 56. The following problems arise. That is, since the through-hole 55 is formed in the same opening cross section as the wiring pit 53, the fire-proof seal is provided on the entire through-hole 55, although the number of cables disposed in the wiring pit 53 is as small as one or two, for example. It is necessary to fill the material, which causes an increase in the amount of the fireproof seal material used and an increase in the cost associated therewith. It is also conceivable to omit the troublesome fixing operation of the anchor bolts by omitting the above-mentioned respective partition plates 57.In this case, if the filled fireproof seal material becomes too thick, the shape cannot be maintained and the weight of the seal cannot be maintained due to its own weight. There is a risk of relative movement in the cable longitudinal direction from the openings on both sides of the through hole 55.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cable wall in which a cable extends along a floor and is disposed through a through hole at a lowermost position of a partition wall. An object of the present invention is to facilitate formation of a fire prevention structure in a penetration portion and to ensure the fire prevention structure. Specifically, while simplifying the formation of the fire prevention structure by omitting the fixing of the partition plate and the filling of the rock wool,
An object of the present invention is to ensure the fire prevention structure by reliably holding the filled fire prevention seal material in a predetermined shape regardless of the size of the through hole.

[0009]

In order to achieve the above object, according to the present invention, a cable extending along a floor upper surface of a structure is provided with a through hole at a lowermost position of a partition wall as a fire protection partition wall. It is assumed that the antenna is arranged to penetrate along the bottom surface. In this, a fire-resistant frame body having a U-shaped cross section formed from an upper wall portion covering the upper surface side of the cable and a pair of side wall portions covering both side surfaces of the cable,
Extending over substantially the entire length of the through hole, the inner surface of the through hole,
The cable is disposed so as to partition the upper side and both sides of the cable located in the through hole. Then, a putty-like fire-proof seal material is filled in the entire space except for the cable from the space defined by the inner surfaces of the upper wall portion and the pair of side wall portions of the frame body and the bottom surface of the through-hole. A filling portion is formed, and in addition, a space between the outer periphery of the frame and the inner peripheral surface of the through hole and at least a space near the opening on both sides of the through hole is filled with a putty-like fireproof seal material. To form a fireproof blocking part.

According to a second aspect of the present invention, the size of the frame in the first aspect of the present invention is adjusted such that the gap between the inner surface of the frame and the cable has a predetermined dimension. The configuration is determined according to the size.

According to a third aspect of the present invention, in the first aspect of the present invention, the pressing is performed such that the frame body is pressed against the bottom side of the through hole so that the fireproof sealing material of the fireproof filling portion is pressed against the cable side. Means.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the floor has a double-floor structure including a floor slab and an upper floor portion disposed at a position above the floor slab. The cable extends in the underfloor space between the floor slab and the upper floor along the floor slab.

Further, the invention described in claim 5 is the invention according to claim 1.
A wiring pit opening upward is formed on the floor in the described invention, and a through hole is formed so as to be continuous with the wiring pit. The cable is arranged along the bottom surface in the wiring pit.

[0014]

According to the above-mentioned structure, according to the first aspect of the present invention,
The periphery of the cable located in the through-hole is covered with a fire-resistant filling portion made of a putty-like fire-proof sealant, and further, the surface of this filling portion is covered with a fire-resistant frame. The insulation from the flame heat is effectively performed, thereby preventing the spread of the sheath on the cable surface and suppressing the heat transfer to the adjacent room through the cable itself. Also,
Since the space between the through-hole and the refractory frame is blocked by a fire-resistant cut-off portion made of a putty-like fire-proof seal material filled at least in the vicinity of both side openings, the above-described through-hole and the refractory frame are The passage of flames and smoke through is blocked. Therefore, it is possible to omit the troublesome filling of the rock wool and the troublesome fixing work of the partition plate in the conventional fire prevention structure, and the work of only filling the putty-like fire prevention seal material and arranging the frame body has the fire prevention structure. Therefore, even when the through-hole is at the lowermost position of the partition wall, it is easy to form a fire prevention structure, and the fire prevention structure can be made more reliable.

[0015] In the formation of the above-mentioned fireproof filling portion, the upper surface and both side surfaces of the cable penetratingly arranged along the bottom surface in the through hole are surrounded by the fireproof frame.
Since the upper surface and the side surfaces constituting the space in the through hole are partitioned, even if the number of cables is small or the total cross-sectional area is small, the cross sectional area of the space excluding the cable in the through hole is relatively large. It is not necessary to fill the entire space with a large cross-sectional area with the fire-proof seal material even if the fire-proof seal material is considerably large. I'm done. For this reason, it is possible to prevent the filling amount of the fireproof sealing material from being excessively large in the formation of the fireproof filling portion and reduce the amount. In addition, as described above, since the fireproof filling portion is surrounded by the frame, even when the fireproof seal material forming the filling portion becomes thick, the flow of the fireproof seal material in the filling portion is prevented. Thus, it is held in a predetermined shape. For this reason, the heat insulation effect of the cable by the above-mentioned filling part is certainly exhibited, and the state is maintained.

According to a second aspect of the present invention, in addition to the operation of the first aspect, the size of the frame is adjusted so that the distance between the inner surface of the frame and the cable is a predetermined size. Since it is determined according to the size of the cable in the cross-sectional direction, even when the relative magnitude relationship of the through hole with respect to the cable is unbalanced as described above, the fireproof seal material for forming the filling portion is not used. It is possible to optimize and optimize the filling amount, and to form an economical fire prevention structure while having a predetermined fire prevention performance.

According to a third aspect of the present invention, in addition to the function of the first aspect of the present invention, the frame is held in a state of being pressed against the bottom surface of the through hole by the pressing means. Since the fire-proof seal material in the filling portion is pressed against the cable side, the fire-proof seal material surely adheres to the outer peripheral surface of the cable, and is particularly securely filled in a narrow space such as a valley between a plurality of cables so that the outer periphery of each cable is Make sure it adheres to the surface. For this reason, the degree of filling of the fireproof sealing material constituting the fireproof filling portion is improved, the adhesion to the cable is improved, and the heat insulating effect on the cable by the filling portion is reliably ensured and maintained. This ensures the fire prevention structure.

According to the fourth aspect of the present invention, there is provided the first aspect.
In addition to the operation according to the described invention, the floor has a double-floor structure, and the cables are arranged along the floor slab in the underfloor space of the upper floor so that the through holes face the underfloor space. As described above, the filling of the rock wool and the two partition plates are omitted for the cable wall penetrating portion, and the arrangement of the frame and the formation of the fireproof filling portion and the fireproof blocking portion by filling the putty-like fireproof sealant are simplified. The fire prevention treatment is completed only by a simple operation, and the formation of the fire prevention structure is facilitated and assured.

According to the fifth aspect of the present invention, in addition to the effect of the first aspect of the present invention, a wiring pit is formed on the floor and a through hole is formed continuously with the wiring pit. Even for the cable wall penetration part where the cable arranged inside continuously penetrates the through hole,
As in the case of the invention described in claim 4, the simple filling of the rock wool and the formation of the fireproof filler and the fireproof shield by arranging the frame and filling the putty-like fireproof sealant by omitting the two partition plates are omitted. The fire prevention treatment is completed only by a simple operation, and the formation of the fire prevention structure is facilitated and assured.

[0020]

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

<Embodiment> FIGS. 3 and 4 show a fire prevention structure of a cable wall penetration portion according to an embodiment of the present invention, 11 is a concrete floor slab,
Above the floor slab 11, an upper floor portion 12 includes a plurality of columns 1
The upper floor 12 and the floor slab 11 form a free access floor as a double floor structure. Reference numeral 13 denotes a solid partition wall as a fire protection partition wall erected on the floor slab 11, and the upper surface 11a of the floor slab 11 is defined as a bottom surface at a lowermost position below the upper floor portion 12 of the partition wall 13. Lateral through holes 14 are formed. Reference numeral 15 denotes a cable group.
Are arranged along the upper surface 11a of the floor slab 11 in a state where a plurality of cables 15a, 15a,... And
Reference numeral 16 denotes a steel frame, reference numeral 17 denotes a fireproof filling portion, and reference numeral 18 denotes a fireproof shielding portion. Hereinafter, the frame 16, the filling portion 17, and the shielding portion 18 will be described in detail.

The frame body 16 is composed of an upper wall portion 16a covering the upper surface side of the cable group 15 and a pair of side wall portions 16b, 16b covering both side surfaces of the cable group 15 to form a U-shaped cross section. It was formed. The frame 16 has a predetermined value (for example, 5
The length of the cable group 15 is determined in accordance with the size in the cross-sectional direction of the cable group 15 so as to secure an interval of not less than mm. 4 is a predetermined length longer than the entire length of the through hole 14 and is perpendicular to the longitudinal direction of the cable (the direction perpendicular to the paper of FIG. 3). , FIG. 4 in the left-right direction;
The width of the through hole 14 is also referred to as the left-right direction for convenience of description.
The height in the vertical direction is set to be substantially shorter than the height of the through hole 14 in accordance with the height of the upper end face of the cable group 15 substantially the same as the inner width of the cable group (interval between the side walls 14b, 14b). I have. The frame 16 is disposed so as to extend over substantially the entire length of the through hole 14 so as to surround the upper surface side and both side surfaces of the cable group 15, and each side end is provided with the through hole 1.
4 protrude from the two opening portions by a predetermined amount.
c is formed, and the internal space of the through hole 4 is
The partition 4a is arranged at a substantially intermediate position between the upper surface side of the cable group 15 and the upper surface side.

The fireproof filling portion 17 is provided with the frame 16
And the space between the cable group 15 and, more specifically, the upper surface 16a of the frame 16 and the inner surfaces of the side walls 16b, 16b, and the upper surface 11a of the floor slab 11, which is the bottom surface of the through hole 14. The space except for the cable group 15 from the partitioned space is formed by filling a putty-like fire-proof seal material described later, whereby the cable group 15 corresponds to at least the predetermined value. A filling portion 17 having a thickness is formed.

In forming the filling portion 17, the frame 1
6, the cable group 15 is appropriately covered with the fire-proof seal material first, then the frame body 16 is provided, and the gap is additionally filled with the fire-proof seal material. However, not only the surface of each cable 15a constituting the cable group 15 but also each cable 15a
It is preferable that all of the narrow spaces such as the valleys between a are filled with the fireproof sealant. Then, the frame 6 is shaped so as to be obliquely raised from both the protruding ends 16c, 16c to the cable group 15 outward.

As the above-mentioned fireproof seal material, a putty-like material is used from the viewpoint of workability. In this case, the following non-foaming putty or foaming putty may be used. Non-foaming putty includes polybutene, silicone oil, liquid paraffin,
A flame retardant is mixed and dispersed in a binder that is liquid at room temperature, such as a liquid chloroprene polymer, and has an oxygen index of 5
0 or more, especially 60 or more are used. Examples of the flame retardant include halogen-containing organic flame retardants such as decapromodiphenyl oxide and hexabromobenzene, metal oxides such as antimony trioxide, alumina hydrate, magnesia hydrate, and basic magnesium sulfate hydrate. , One or more hydrated metal oxides such as basic magnesium carbonate hydrate and basic magnesium phosphate hydrate are used. It is preferably used. Specific examples of the above non-foamable putty include:
JP-B-63-460, JP-A-56-106935
And chloroprene based on the liquid chloroprene described in Japanese Unexamined Patent Publication (Kokai) No. HEI 9-131, and, if necessary, blended with inorganic fillers and heat-resistant fibers. More specifically, DF Putty N (trade name of Mitsubishi Cable Industries, Ltd.) It may be used.

As the foaming putty, 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 binder at room temperature such as polybutene and liquid paraffin is used. As an example of such foaming putty, Japanese Patent Publication No. Sho 5
There are those disclosed in JP-A-5-33795 and JP-B-53-39190, and specifically, DF Putty A (trade name of Mitsubishi Cable Industries, Ltd.) may be used. The “foamable putty” is a putty that, when heated to a high temperature, thermally decomposes to form a foamed carbide.

On the other hand, the shielding portion 18 shields the opening between the outer periphery of the frame 16 and the inner peripheral surface of the through-hole 14 to partition the partition 1.
3 to block the space under both floors from intersecting and prevent the passage of flames and smoke to the next room. A pair of support members 19, 19 made of angle material, and a pair of support members 19, 19
And a buried member 20 disposed in an upper space in the through hole 14 partitioned by the frame 16 and the remaining portion of the upper space excluding the buried member 20 is filled with the same fireproof seal material as described above. And the fire-resistant shut-off portion 21 formed in this way. That is, the shielding portion 18 is formed over the entire length between the openings on both sides of the through hole 14 so as to block the passage of the flame and smoke through the through hole 14.

Each of the support members 19 abuts on the outer surface of the partition wall 13 above the opening of the through-hole 14 and extends over the entire length of the through-hole 14 in the left-right direction. Bolts and nuts 19a are fixed to the upper surface of each upper wall portion 16a, so that each opening between each upper wall portion 16a and the upper surface 14a of the through hole 14 is shielded. In addition, the support members 19 are arranged such that the support members 19 on both sides abut against both outer surfaces of the partition wall 13 so that the relative position of the frame body 16 to the partition wall 13 does not deviate from the predetermined one in the front-rear direction. Frame 1
6 is held.

The buried member 20 is formed of a relatively thick material made of fire-resistant material such as calcium silicate, and the volume of the blocking part 21 with respect to the upper space in the through hole 14 is reduced by the amount of the buried member 20. To reduce the filling amount of the fireproof sealant. FIG.
In the middle, 21a is a side seal portion of the shielding portion 18,
The side seal portion 21a is formed such that a fire prevention seal material is obliquely raised between the outer surface of each side wall portion 16b at each of the protruding end portions 16c and the outer surface of the partition wall 13, so that the side wall portions 16b and the through holes are formed. The gap between each side surface of each of the fourteenth and fourteen is sealed.

In the case of the above-described embodiment, the heat insulation from the flame heat of the cable group 15 located in the through hole 14, the fireproof filling portion 17 and the fireproof frame 1 covering the cable group 15 are provided.
6, each cable 15a
While it is possible to prevent the spread of the fire itself and the heat transfer through each cable 15a itself, it is possible to block the passage of the flame or smoke through the through-holes 14 by the fireproof blocking part 21 of the fireproof shielding part 18. . Therefore, the fire prevention performance required in the cable wall penetration portion can be provided mainly by only filling the putty-like fire prevention seal material.

In addition, the conventional cable wall penetrating portion in which the cable group 15 disposed in the underfloor space of the double floor structure continuously passes through the through hole 14 at the lowermost position of the partition wall 13 can be used. Of the rock wool 56 in the fire prevention structure (see FIG. 6 and the like) in a troublesome and bad environment and the partition plates 57, 5
By omitting the step 7, the fire protection treatment is completed only by a simple operation of arranging the frame body 16 and forming the fire protection filling portion 17 and the fire protection blocking portion 21 by filling the fire protection seal material. In particular, as compared with the conventional fire prevention structure, since there is no troublesome work of fixing the anchor bolts to the partition walls when attaching the fixing brackets of the respective partition plates 57, the work for forming the fire prevention structure can be easily performed. Therefore, it is possible to easily form the fire prevention structure even in a narrow place in the underfloor space, and it is possible to reliably form the fire prevention structure with the simplification.

In the formation of the above-mentioned fire-resistant filling portion 7, the upper surface and both side surfaces of the cable group 5 penetratingly arranged along the bottom surface 1a in the through hole 4 are surrounded and partitioned by the frame 6. As a result, the fire-proof seal material of the internal filling portion 17 is maintained in a predetermined shape, and can be maintained in a state in which the cable group 15 is surely covered, whereby the formation of the fire-proof structure is further ensured. While being able to
It is possible to reliably maintain the heat insulating effect of the filling portion 17 and reliably exhibit a predetermined fire prevention performance. At this time, the frame 16 is made of steel, and its relatively heavy weight acts on the fire seal in the filling portion 17 as a downward pressing force.
a can be further improved, and the above-mentioned heat insulating effect can be maintained more reliably. Thereby, the fire prevention structure for the cable wall penetration portion as described above can be made more reliable.

Further, in the present embodiment, the size of the frame 16 is determined according to the cross-sectional area of the cable group 15 so that the distance between the inner surface of the frame 16 and the cable group 15 becomes a predetermined dimension. Therefore, even when the cable group 15 having a relatively small cross-sectional area is arranged to penetrate through the through hole 14 having a relatively large opening, the filling of the fireproof seal material for forming the filling portion 17 is performed. The amount can be optimized and optimized, and the fire prevention structure can be formed economically while having the predetermined fire prevention performance.

<Reference Example> FIGS. 1 and 2 show a reference example of a fire prevention structure of a cable wall penetration portion when a fire prevention partition wall is formed by a hollow partition wall. Reference numeral 1 denotes a wiring pit. Numeral 1 denotes a groove formed in the upper surface 2a of the concrete floor 2 so as to open upward. Reference numeral 3 denotes a hollow partition wall as a fire protection partition wall. The hollow wall 3 has a pair of wall bodies 3b fixed to each other at a predetermined interval so that a cavity 3a is interposed therebetween.
3b and the upper surface 2a of the concrete floor 2
It was erected in. 4 is a horizontal through hole,
This through hole 4 is formed by the wiring pit 1 passing below the hollow partition wall 3. That is, the through hole 4
Is formed by partitioning the upper side of the wiring pit 1 by the lower surface 3c of the hollow partition 3. The bottom surface 1a and both side wall surfaces 1b, 1b of the wiring pit 1 correspond to the bottom surface and both side wall surfaces of the through hole 4. The lower surface 3c of the hollow partition wall 3 is a through hole 4.
, And the cavity 3 a is open toward the internal space of the through hole 4.

Reference numeral 5 denotes a cable group. The cable group 5 includes a plurality of stacked cables 5a, 5a,.
Extend along the bottom surface of the wiring pit 1 in a bundled state, and are disposed through the through hole 4. And 6
Is a steel frame, 7 is a fireproof filler, 8 and 8 are fireproof shields, respectively, and the filler 7 and both shields 8 are integrally formed with each other. Hereinafter, the frame 6, the filling portion 7, and the shielding portions 8, 8 will be described in detail.

The frame 6 has an upper wall portion 6a covering the upper surface side of the cable group 5 and a pair of side wall portions 6b, 6b covering both side surfaces of the cable group 5 to have a U-shaped cross section. It was formed. The size of the frame body 6 is determined such that a gap of a predetermined value (for example, a value of 5 mm or more) can be ensured even in a portion where the gap with the cable group 5 is narrow while taking into consideration that the fire protection partition wall is a hollow partition wall. In the case of this example, the longitudinal direction of the cable (the left-right direction in FIG. 1 and the direction perpendicular to the plane of FIG. 2; hereinafter, also referred to as the front-rear direction for convenience of description)
Is slightly longer than the entire length of the through-hole 4, and has a width in a direction perpendicular to the longitudinal direction of the cable (a direction perpendicular to the plane of FIG. 1; a horizontal direction in FIG. 2; hereinafter also referred to as a horizontal direction for convenience of description). Is the inner width of the through hole 4 (both side walls 1b, 1b
The vertical height is set slightly shorter than the height of the through hole 4 (the depth of the wiring pit 1). The frame body 6 extends over substantially the entire length of the through hole 4 so as to surround the upper surface side and both side surfaces of the cable group 5, and both side ends 6 c, 6 c protrude slightly from the respective openings of the through hole 4. It is arranged so as to partition between the lower surface 3 c and both side walls 1 b, 1 b of the hollow partition wall 3 defining the internal space of the through hole 4 and the cable group 5.

The fireproof filling portion 7 is provided in the space between the frame 6 and the cable group 5, more specifically, the inner wall of the upper wall 6 a and both side walls 6 b, 6 b of the frame 6, The space defined by the bottom surface 1a of the through hole 4 and the space excluding the cable group 5 are filled with the same fire-proof seal material as in the above embodiment, and have a thickness of at least the predetermined value. Is formed.

In forming the filling portion 7, the frame 6 is arranged at a predetermined position with respect to the cable group 5, and the inside of the frame 6 is filled with a fire-proof seal material. Not only the surface of each cable 5a that constitutes the above, but also all the gaps such as valleys between the cables 5a are filled with a fire-proof sealing material, and the upper surface of the cable group 5 before the frame 6 is arranged. The side and both side surfaces may be covered with a fire-proof seal material with an appropriate thickness, the frame body 6 may be covered from above and pressed down, and the remaining gap may be filled with the fire-proof seal material to achieve the above-described state. Lastly, the frame 6 is shaped so as to be raised obliquely from both ends 6c, 6c to the cable group 5. Then, the upper wall portion 6a of the frame body 6 is pushed upward by the filling pressure of the fire-proof seal material and comes into contact with the lower surface 3c of the hollow partition wall 3, whereby the frame body 6 is filled by a reaction force as a reaction. The part 7 is pressed against the cable group 5.

Each of the shielding portions 8 shields a gap opened between both ends 6c, 6c of the frame body 6 and the through hole 4 to block the inside and the outside of the through hole 4. The same fireproof seal material as described above is formed by filling and building up. Specifically, the upper wall portion 6a at each of the side ends 6c is provided.
And filling between the upper wall 3b and the outer surface, and
It is formed by filling the space between each side wall portion 6b at each side end 6c and each side wall surface 1b of the through hole 4.

In the fire protection structure having such a configuration, the periphery of the cable group 5 located in the through hole 4 is covered with a fire-resistant filling portion 7 made of a fire-proof sealing material, and the surface of the filling portion 7 is fire-resistant. As a result, the cable group 5 is effectively insulated from the flame heat, so that the sheath on the surface of each cable 5a is prevented from spreading and the cables 5a themselves are moved to the adjacent room. Can be suppressed. Further, since the openings between both side openings of the through hole 4 and the cable group 5 are shielded by the fireproof shielding portions 8 and 8 made of a fireproof seal material, the passage of flame and smoke through the through hole 4 is blocked. can do. Therefore, the fire prevention performance required in the cable wall penetration part can be provided mainly by only filling the fire prevention seal material.

In addition, the conventional fire prevention structure (see FIG. 6) can be applied to a cable wall penetrating portion where the cable group 5 arranged in the wiring pit 1 continuously passes through the through hole 4 at the lowermost position. And the troublesome fixing work of the partition plates 57, 57, and the troublesome filling work of the rock wool 56 and the troublesome fixing work of the partition plates 57, 57 are omitted. The fire prevention treatment is completed only by the simple operation of forming the fireproof shielding portion 8, and the formation of the fire prevention structure can be facilitated even in a narrow place such as the wiring pit 1 described above. The structure can be reliably formed.

In the formation of the above-mentioned fire-resistant filling portion 7, the upper surface and both side surfaces of the cable group 5 penetratingly arranged along the bottom surface 1a in the through hole 4 are surrounded and partitioned by the frame 6. Therefore, even if the hollow portion 3a of the hollow partition wall 3 is a cable wall penetrating portion that is open facing the internal space of the through hole 4, the fireproof sealing material to be filled flows toward the hollow portion 3a. Can be prevented.
For this reason, it is possible to prevent the work of filling the fireproof seal material and the wasteful use of the fireproof seal material itself to be filled, and to optimize the work and the filling amount thereof, and to ensure the formation of the fireproof structure. Can be achieved.

In addition, when the fireproof sealing material is filled inward while the cable group 5 is partitioned by the frame body 6, the upper wall portion 6a is pressed upward and the hollow portion 3a is pressed.
a is closed and the reaction force causes the fireproof seal material in the filling portion 7 to be pressed against the cable group 5 side.
The adhesion between the fireproof seal material of the filling section 7 and each cable 5a can be enhanced, and the heat insulation effect of the filling section 7 can be further ensured. At this time, since the frame 6 is made of steel, and its relatively heavy weight acts as a downward pressing force on the fireproof seal material in the filling section 7, each cable 5a of the fireproof seal material is used. The heat insulating effect can be maintained more reliably, and the above-mentioned heat insulating effect can be further ensured. Thereby, the fire prevention structure for the cable wall penetration portion as described above can be made more reliable.

<Other Embodiments> The present invention is not limited to the above-described embodiment.
Other various embodiments are included. That is,
In the above embodiment, the width of the frame 16 in the left-right direction is set to be substantially the same as the width of the through-hole 14 in the left-right direction. However, the present invention is not limited to this. If it is significantly smaller than that of the through hole 14,
The width of the frame body in the left-right direction may be reduced according to the width of the cable group in the left-right direction. That is, it is sufficient that the thickness of the fireproof seal material of the filling portion covering the cable group can be sufficient to ensure the heat insulation performance, and accordingly, the filling amount of the fireproof seal material can be optimized and economy can be achieved.

In the above embodiment, as the shielding portion 18, the blocking portion 21 made of a fire-proof seal material filled over the entire length of the through hole 14, the embedded member 20, and the pair of support members 1 for shielding both sides.
9 and 19 are shown, but the present invention is not limited to this, and the buried member 20 may be omitted and the space corresponding to the buried member 20 may be filled with a fireproof seal material. Alternatively, the above-described support members 19 may be omitted, and the fire-proof seal materials on both side ends of the blocking portion 21 may be formed so as to be raised obliquely over the respective projecting end portions 16c of the frame 16. Further, instead of filling the fireproof sealing material over the entire length of the through hole 14,
Only the vicinity of the opening on both sides of the through hole 14 may be filled with a fire-proof seal material to form a pair of blocking portions, and the inside may be hollow. In this case, by using the frame body 16 sized according to the size of the cable group 16 in the cross-sectional direction, a fire-proof seal material is applied to the entire internal space of the cable group 15 regardless of the size of the through hole 14 with respect to the cable group 15. Compared to the case of filling, optimization and economicalization of the total amount of the fireproof seal material can be particularly effectively achieved.

In the above embodiment, the frame 16 is made of steel, and the relatively heavy frame 16 itself constitutes a pressing means for pressing the fire-proof seal material of the filling portion 17 against the cable group 15 side. The present invention is not limited to this. In addition to the weight of the frame itself, the fire prevention seal material may be positively pressed using independent pressing means 31 as shown in FIG. The pressing means 31 includes a pair of bolt members 32 and 33 having oppositely threaded thread portions, and a sleeve nut 34 screwed in a state where the tips of both thread portions are vertically opposed to each other. By rotating the sleeve nut 34 in one direction, the two bolt members 32, 3
3 are vertically separated from each other, and are rotated in the other direction, so that the two bolt members 32 and 33 approach each other in the vertical direction. Then, the head 32a of the bolt member 32 of the pressing means 31 is placed on the upper surface 14a of the through hole 14,
The head 33a of the bolt member 33 is connected to the upper wall 16a of the frame 16.
And each of the bolt members 3
The frame 16 can be pressed downward by rotating the sleeve nut 34 to the side where the members 2 and 33 are separated from each other. When such an independent pressing means is used, the frame may be formed of a nonflammable material other than steel, for example, a fire-resistant organic resin.

Further, the cable wall penetrating portion which is the object of the present invention may have a slight step between the bottom surface of the through hole and the bottom surface 1a of the wiring pit 1 or the upper surface 11a of the floor slab 11. Good.

[0048]

As described above, according to the fire prevention structure of the cable wall penetration portion according to the first aspect of the present invention, the periphery of the cable located in the through hole is provided with a putty-like fire prevention sealing material made of a putty-like fire prevention seal material. Further, since the surface of the filling portion is covered with the refractory frame, heat insulation from the flame heat of the cable can be effectively performed. It is possible to suppress the heat transfer through the cable itself to the side, and at the same time, put the space between the through hole and the refractory frame at least in the vicinity of the openings on both sides in a putty-like fireproof seal material. Since it is blocked by the portion, it is possible to block the passage of a flame or smoke passing between the outer periphery of the frame and the through hole. For this reason, the troublesome filling of rock wool and the troublesome fixing work of the partition plate in the conventional fireproof structure and the troublesome fixing work of the partition plate are omitted. The fire prevention structure can be formed easily and reliably even when the through hole is at the lowermost position of the partition wall.

Further, in the formation of the above-mentioned fireproof filling portion, the upper and both sides of the cable penetratingly arranged along the bottom surface of the through-hole are surrounded by a fire-resistant frame, and the inside of the through-hole is enclosed. Even if the number of cables is small or the size in the cross-sectional direction is small and the cross-sectional area of the space excluding the cable in the through hole becomes relatively large, the partitioning It is not necessary to fill the entire space having a large cross-sectional area with the fire-proof seal material, and only the inside of the filling space partitioned by the frame needs to be filled with the fire-proof seal material. It is possible to prevent the filling amount from becoming excessive and reduce the amount. In addition, as described above, since the fireproof filling portion is surrounded by the frame, even when the fireproof seal material forming the filling portion becomes thick, the flow of the fireproof seal material in the filling portion is prevented. As a result, it is possible to reliably exert the heat insulating effect of the cable by the above-mentioned filling portion, and to maintain the state.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the size of the frame is adjusted so that the distance between the inner surface of the frame and the cable becomes a predetermined size. As described above, since it is determined according to the cross-sectional area of the cable, even if the cable arranged to penetrate the through-hole has a cross-sectional area significantly smaller than the cross-sectional area of the opening of the through-hole, the filling portion is formed. It is possible to optimize and optimize the filling amount of the fireproof seal material, and to provide an economical fireproof structure while having a predetermined fireproof performance.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the pressing means can
Since the frame body is held in a state pressed against the bottom side of the through hole and the fireproof seal material in the filling portion between the cable and the cable is pressed against the cable side, the filling degree of the fireproof seal material in the filling portion is increased. The adhesion between the fireproof sealant and the outer peripheral surface of the cable can be improved, and the heat insulation effect on the cable by the filling portion can be reliably ensured and maintained. Thereby, the fire protection performance of the fire protection structure can be further ensured.

According to the fourth aspect of the invention, in addition to the effect of the first aspect, the floor has a double-floor structure, and the cable runs along the floor in the underfloor space of the upper floor. As described above, the filling of the rock wool and the two partition plates are omitted, and the arrangement of the frame body and the fireproof seal material are also performed for the cable wall through portion where the through hole faces the inside of the underfloor space. Since the fire-prevention treatment is completed only by a simple operation of forming the fire-resistant filling portion and the fire-protective shielding portion by filling with, the formation of the fire-resistant structure can be facilitated and assured.

According to the fifth aspect of the present invention, in addition to the effect of the first aspect, a wiring pit is formed on the floor, and a through hole is formed continuously with the wiring pit. As in the case of the invention according to the fifth aspect, the filling of the rock wool and the two partition plates are also omitted for the cable wall penetrating portion where the cable arranged in the wiring pit continuously passes through the through hole. The fire prevention treatment is completed only by the simple operation of forming the fire-resistant filling part and the fire-proof shielding part by arranging the frame and filling the fire-proof sealing material, so that the formation of the fire-proof structure can be facilitated and assured. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a reference example.

2 is a cross-sectional view taken along line AA of FIG. 1 on the right side with respect to the center line, and a cross-sectional view taken along line BB of FIG. 1 on the left side.

FIG. 3 is a sectional view showing an embodiment of the present invention.

4 is a cross-sectional view taken along line CC of FIG. 3 on the left side with respect to the center line, and a cross-sectional view taken along line DD of FIG. 3 is on the right side.

FIG. 5 is a front view illustrating an example of a pressing unit.

FIG. 6 is a sectional view showing a conventional fire protection structure.

7 is a sectional view taken along line EE of FIG. 6 on the left side with respect to the center line, and a sectional view taken along line FF of FIG. 6 on the right side.

[Explanation of symbols]

 11 Floor slab 11a Upper surface (floor upper surface; bottom surface of through hole) 12 Upper floor portion 13 Partition wall 14 Through hole 15 Cable group (cable) 16 Frame 16a Upper wall portion 16b Side wall portion 17 Fireproof filling portion 21 Fireproof blocking portion 31 Press means

Claims (5)

(57) [Claims] 1. A fire prevention structure of a cable wall penetration portion in which a cable extending along a floor upper surface of a structure is arranged in a through hole at a lowermost position of a partition wall serving as a fire protection partition wall along a bottom surface thereof. An upper wall portion that covers the upper surface side of the cable and a pair of side wall portions that cover both side surfaces of the cable have a U-shaped cross-sectional shape, and extend over substantially the entire length of the through-hole. And a fire-resistant frame disposed so as to partition the upper surface and both side surfaces of the cable located in the through-hole, and the inner surface of the upper wall portion and the pair of side wall portions of the frame body and the through hole.
Remove the cable from the space defined by the bottom of the hole.
Putty-shaped fireproof sealant is filled in all of the space
Between the outer periphery of the frame and the inner peripheral surface of the through hole.
Putty in at least the space near the opening on both sides of the through hole
And a fire-blocking portion formed by filling with a fire-proof seal material . 2. The cable according to claim 1, wherein the size of the frame is determined in accordance with the size of the cable in the cross-sectional direction such that the gap between the inner surface of the frame and the cable has a predetermined size. The fire prevention structure of the cable wall penetration. 3. A pressing device according to claim 1, further comprising pressing means for holding the frame body pressed against the bottom surface side of the through hole so that the fireproof sealing material of the fireproof filling portion is pressed against the cable side. Fire prevention structure of cable wall penetration. 4. The floor according to claim 1, wherein the floor has a double floor structure including a floor slab and an upper floor portion disposed at a position separated upward from the floor slab. A fire prevention structure for a cable wall penetration part, which is provided so as to extend along the floor slab in an underfloor space between the floor and the upper floor. 5. The wiring pit according to claim 1, wherein a wiring pit opening upward is formed in the floor, a through hole is formed so as to be continuous with the wiring pit, and a cable extends along a bottom surface in the wiring pit. A fire prevention structure for a cable wall penetration part, which is arranged.