JP3701547B2 - Fire-proof compartment treatment structure for pipe and cable penetrations - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building slab tube cables are those concerning the firestop structure of the penetrating part which penetrates.
[0002]
[Prior art]
Conventionally, there has been disclosed in Japanese Utility Model Publication No. 63-29325, etc., as a fireproof compartment processing structure for a building slab penetration part through which a power cable or the like is wired. In this structure, a metal cylinder provided with a hook portion that engages with the upper surface of the slab is inserted into the slab penetrating part, and a fireproof material is filled in the cylinder for fire prevention treatment. Here, the fire protection section treatment in the slab penetration part prevents the flame under the slab from spreading on the slab (the flame does not spread from the upper floor to the lower floor of the building), and the flame heat under the slab It is important that the slabs do not burn out on cable exposed parts that are not covered with refractory material. Note that the portion of the cable covered with the refractory material will be burned out due to heat transfer, and the flame will be cut off due to the expansion of the refractory material. It will not spread to the exposed part of the cable.
[0003]
For this reason, in the said structure, in order to keep the said cable exposure part on a slab as far as possible from the flame under a slab, it had to raise and construct a refractory material on a slab. Since this construction method requires the use of a large amount of refractory material, it is uneconomical, and the work of raising the refractory material on the slab is troublesome and difficult. In addition, it is conceivable that the cable exposed portion is kept away from the slab by extending the upper end of the through cylinder above the slab and closing the upper end opening with a refractory material. Since the heat at the lower end of the cylindrical body is transmitted to the upper end and the heat at the upper end is transmitted to the cable exposed portion, there is a high risk that the cable on the slab will spread (low fire resistance).
[0004]
[Problems to be solved by the invention]
The problem of the present invention is that the flame heat under the slab is transferred without performing the troublesome and uneconomical work of raising the refractory material on the slab and moving the cable exposed portion away from the slab as in the conventional structure. Therefore, it is possible to provide a structure that can prevent fires from being exposed to the cable exposed portion and perform the fire-proof section processing more safely.
[0005]
[Means for Solving the Problems]
In order to solve this problem, the invention of claim 1 is a fire zone processing structure for a penetration part through which a pipe / cable penetrates a slab of a building, the pipe / cable passing through the penetration part, and the pipe / cable. Is penetrated inside, and the lower end is disposed in the through portion without protruding from the lower opening of the through portion, and the non-combustible material through cylinder is fixed to the slab . The upper refractory material filled between the inner peripheral surface of the through-cylinder and the tube / cable, and at least the lower end of the through-cylinder is exposed in the event of a fire under the slab. in order to prevent the facing side opening, and a lower refractory material at least the lower end is located lower than the lower end of the through cylinder, Ru filled in the through portion so as to close the through lower side, It is characterized by having.
[0006]
If the flame is generated below the slab, in order to lower refractory member closes the through section lower in thermal expansion, to expose the lower end of the through-cylinder, for facing the lower opening of the through portion It has a structure that prevents That is, the lower end of the through cylinder is completely covered by the thermal expansion of the refractory material and has a structure in which the flame does not reach directly, and the extension length of the through cylinder from the slab becomes long. Since the distance from the flame generating part under the slab to the cable exposed part at the upper end of the through cylinder can be secured long, the flame heat under the slab is hardly transmitted to the through cylinder. For this reason, even if a flame is generated under the slab, the temperature at the upper end of the through cylinder does not become so high, and heat is transferred to the tube / cable exposed portion above the upper refractory material and does not burn out. . In the invention of claim 1, in addition to the above-described general action, at least the lower end portion of the lower refractory material is disposed below the lower end of the penetrating cylinder, so that when a flame is generated below the slab, The flame can be prevented from entering the inside of the through cylinder from the lower end. As a result, it is possible to suppress an increase in the temperature of the through cylinder, thereby contributing to the prevention of the fire spread of the tube / cable exposed portion on the slab.
[0007]
According to a second aspect of the present invention, in the first aspect of the invention , the lower refractory material is dropped into the through-cylinder body, and the upper end of the metal is hooked on the upper end of the through-cylinder body. It is characterized by being supported by a refractory support. According to the second aspect of the present invention , “at least in the event of a fire under the slab, the lower end of the through-hole is lowered to prevent the lower end of the through-hole cylinder from being exposed and facing the lower opening. "Structure closed with side refractory material" can be easily realized.
[0008]
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the upper end portion of the lower refractory material is fitted inside the lower end portion of the through cylinder.
[0009]
According to the invention of claim 3, the lower end portion of the lower refractory material is supported by the lower refractory material support, and the upper end portion thereof is fitted inside the lower end portion of the through cylinder. The support state of the lower refractory material with respect to the through cylinder is stabilized.
[0010]
According to a fourth aspect of the present invention, in the first aspect of the invention, the lower refractory material is supported by a support member disposed at a lower end portion of a through hole formed in a slab of a building, and a lower end surface of the through cylinder. Is configured to contact the upper surface of the lower refractory material.
[0011]
According to the fourth aspect of the present invention, the lower refractory material can be attached to the inner peripheral surface of the through hole by the support device arranged at the lower end of the through hole of the slab, and the lower end is inserted into the through hole. The through cylinder to be placed can be arranged and fixed at a predetermined position simply by abutting and supporting the side refractory material having the lower end thereof.
[0012]
According to a fifth aspect of the present invention, in the first aspect of the invention, the lower refractory material is supported by a pair of support members that are integrally attached to the lower end of the penetrating cylindrical body. It is characterized by being.
[0013]
According to the fifth aspect of the invention, a separate support is not required to support the lower refractory material, and the overall structure is simplified.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is an overall perspective view of a portion of a through hole H of a slab S having a fireproof compartment processing structure according to the present invention, FIG. 2 is also a plan view, and FIG. 3 is a XX line in FIG. FIG. 4 is an enlarged cross-sectional view, and FIG. 4 is an exploded perspective view of each member constituting the fire prevention compartment processing structure according to the present invention. First, with reference to FIG. 1 thru | or FIG. 4, the whole structure of the said fire prevention division processing structure is outlined, and the structure of each part is also demonstrated in detail after that including the construction method.
[0015]
That is, a rectangular through hole H that is a combined planar shape of a plurality of (three in the embodiment) metal through cylinders T having a rectangular tube shape is opened in a through portion of the cable C in the slab S. Each through cylinder T is in a state in which only its lower end portions are in close contact with each other, and only about 1/3 of the lower end portion is inserted into the through hole H, and the outer side of the opposing side plate portion 11. The slab S is fixed to the slab S through a pair of fixing pieces 12 attached to the slab S. In the fixed state of the through cylinder T, the lower end surface Ta thereof is located above the bottom surface Sa of the slab S by a predetermined length and is located in the through hole H.
[0016]
Further, as shown in FIG. 5, an inorganic thermal foam that expands by being thermally foamed by flame heat is formed on the outer peripheral surface of the portion inserted into the through hole H in the through cylinder T before being inserted into the through hole H. In a state where the filler 1 is applied with a predetermined thickness and the through cylinder T is inserted into the through hole H, the inside thereof is heated by a burner or the like to thermally expand and expand the inorganic thermal foam filler 1. The gap formed between the inner peripheral surface of the through hole H and the outer peripheral surface of the through cylinder T and the gap formed between the adjacent through cylinders T in the through hole H are eliminated. Thus, since the said inorganic thermal foaming filler 1 is not apply | coated to the outer peripheral surface of the part arrange | positioned upwards from the upper surface of the slab S in the penetration cylinder T, in the upper part from the slab S, a phase is mentioned. A predetermined gap 2 (see FIG. 7) is formed between the other opposing side plate portions 13 of the adjacent through cylinders T.
[0017]
The inorganic thermal foaming filler 1 is a composition containing alkali silicate, zinc borate, unfired vermiculite, synthetic swellable mica and / or synthetic smectite, and does not contain organic matter. In addition, since it does not carbonize even in the event of a fire, it exhibits high fire resistance and also has a high fixing strength (adhesive strength).
[0018]
Further, a cable C is inserted into each through cylinder T, and a pair of lower refractory material supports D ₁ are arranged on the inner side surface of the opposing side plate portion 11 of each through cylinder T. The hook portion 22 at the upper end is hooked on the upper end of the opposite side plate portion 11, and the support plate portion 21 at the lower end protrudes downward from the lower end of the through cylinder T, and is lowered by each support plate portion 21. side refractory material A ₁ is supported. The lower refractory material A ₁ is in a state in which only a part of the upper end thereof is fitted inside the lower end portion of the penetrating cylinder T, and the remaining portion is downward from the lower end of the penetrating cylinder T. The lower opening of the through hole H is closed with a slight gap 4 formed between the outer peripheral surface and the inner peripheral surface 3 of the through hole H.
[0019]
Further, a pair of upper refractory support D ₂ is hooked on the upper end of the opposite side plate portion 13, and the upper refractory material A is wrapped around the outer periphery of the cable C on the upper end portion of the through tube T. ₂ is inserted and filled, and the upper refractory material A ₂ is supported by the pair of upper refractory material supports D ₂ . Therefore, as shown in FIG. 3, a large space portion 5 is formed between the lower and upper refractory materials A ₁ and A ₂ inside the through cylinder T.
[0020]
Subsequently, the fire protection compartment treatment structure will be described in more detail, including a method of constructing the through hole H of the cable C formed in the slab S in the fire prevention compartment treatment structure having the above configuration. FIG. 5 is a perspective view in which a part of the through cylinder T is broken, and only about 1/3 from the lower end of the through cylinder T is inserted into the through hole H, and only the outer peripheral surface of the part is shown. The inorganic thermal foaming filler 1 is coated on the surface. As shown in FIGS. 6 and 7, the plurality of through cylinders T are inserted into the through holes H formed in the slab S at only about 1/3 from the lower ends thereof, so that the opposing side plate portion 11 Each through cylinder T is fixed to the slab S by fixing each fixing piece 12 attached to the outer side surface to the slab S via the anchor bolt 6.
[0021]
In this state, when the inside of each through cylinder T is heated by the burner B, the inorganic thermal foaming filler 1 applied to the outer peripheral surface of the lower end portion of each through cylinder T is heated as shown in FIG. The gap between the inner peripheral surface of the through-hole H and the outer peripheral surface of the through-hole cylinder T and the gap between adjacent through-hole bodies T in the through-hole H are eliminated by foaming and expanding. ing. In addition, in FIG. 8, 1 'shows the inorganic thermal foaming filler after foaming.
[0022]
Next, as shown in FIGS. 9 to 12, the cables C are inserted into the respective through cylinders T so that the pair of metal lower refractory material supports D ₁ are opposed to the respective through cylinders T. Thus against each inner surface of the side plate portion 11, the hook the hook portion 22 of the upper end to the upper end of the opposite side plate portions 11 of the through-cylinder T, the support plate portion to which the provided at the lower end of the support D ₁ 21 protrudes downward from the lower end of the through cylinder T, and is disposed at a position close to the lower end of the through hole H (the bottom surface Sa of the slab S). In this state, the lower refractory material divided bodies A ₁ a and A ₁ b divided into blocks are inserted from the upper end opening of the through-hole cylinder T, and each support plate of the pair of lower refractory material support tools D ₁ is inserted. When supported by the portion 21, a predetermined gap 7 remains in the peripheral portion of the cable C as shown in FIG. Therefore, as shown in FIG. 12 (B) and FIG. 12, each of the gap 7 and the lower refractory material divisions A ₁ a, A ₁ b is used by using a filling gun (not shown). When the gap or the like is filled with a liquid refractory agent and solidified, the gap 7 is closed by the filled refractory material A ₃ . Note that the lower refractory material divisions A ₁ a and A ₁ b are supported on the respective support plate portions 21 of the pair of lower refractory material support tools D ₁ , and pass through the pair of support tools D ₁ . When inserted into the cylindrical body T, the filling work of the lower refractory material A ₁ becomes easy.
[0023]
Thus, as shown in FIGS. 10, 11 (b) and 12, the lower end opening of the through hole H through which the cable C is inserted is formed by the lower refractory material A ₁ and the filled refractory material A _3. The bottom refractory material A ₁ is closed with a slight gap 4 formed between the outer peripheral surface of the lower refractory material A ₁ and the inner peripheral surface of the through hole H. In addition, as described above, the gap between the inner peripheral surface of the through hole H and the outer peripheral surface of each through cylinder T, and the gap between the opposing side plate portions 13 of each through cylinder T in the through hole H are Since it is blocked by the foamed inorganic thermal foaming filler 1 ′, the flame generated below the slab S is blocked by the through hole H and does not reach the top. Incidentally, the engagement member 22 of the lower refractory support D _1, as shown in FIG. 1, is eventually bent downward.
[0024]
Further, as shown in FIG. 9, the lower refractory material support D ₁ is made of a thin metal plate, and is disposed vertically except for the support plate portion 21 at the lower end and the hook portion 22 at the upper end. The hanging plate portion 23 has a rectangular frame shape with the most of the center cut out. Thus, the lower refractory material support D ₁ is made of a thin metal plate, and the hanging plate portion 23 that is in direct contact with the penetrating cylinder T is cut out at the center thereof to form a rectangular frame shape. Since the contact area with the through cylinder T is extremely small, the amount of heat transfer to the through cylinder T is reduced even if the lower refractory material support D ₁ is heated by a flame or the like below the slab S. The structure is such that the amount of heat transferred to the cable exposed portion above the slab S is minimized. For this reason, it is desirable that the lower refractory material support D ₁ is made of a material having low thermal conductivity such as ceramic.
[0025]
Finally, as shown in FIGS. 13 to 15, the upper refractory material A ₂ and the filled refractory material A ₃ are filled into the upper end opening of each through tube T using the upper refractory material support D _2. Block. In this upper refractory material support D ₂ , a metal wire is bent into a box-shaped cross section, and vertical suspension portions 32 are integrally formed at both ends of the horizontal support portion 31, and the upper end portions of the vertical suspension portions 32 are further formed. The hook 33 is configured to be bent outward. That is, a pair of upper refractory material support D ₂ is inserted into the inside from the upper end opening of the through cylinder T, and the hook portions 33 at both ends thereof are hooked on the opposed side plate portions 13 of the through cylinder T, In the same manner as the lower refractory material A ₁ , the upper refractory material divided parts A ₂ a and A ₂ b divided into blocks are inserted from the upper end opening of the through-hole cylinder T, and a pair of upper refractory material supports and is supported on the horizontal support 31 of the tool D _2, a liquid refractory material is solidified by filling in the gap 8 between the cable C inserted through the through-cylinder T. Thus, as shown in FIG. 15 (b), the upper end opening of the through cylindrical body T cable C is inserted therein, the upper refractory material A ₂ and filling refractory material A ₃ is closed is filled The Incidentally, as shown in FIG. 7, the gap 2 is formed between the opposite side plate portions 13 of the through-cylinder T adjacent, hook portion 33 of the upper refractory support D _2, the opposite side plate portions 13 can be hooked on the upper end.
[0026]
Thereby, the through cylinder T is arranged in the through hole H without the lower end projecting from the lower end opening of the through hole H of the slab S, and the upper end is greatly separated from the upper surface of the slab S. In the disposed state, the lower end opening of the through hole H is filled and closed with the lower refractory material A ₁ disposed mostly below the lower end of the through cylindrical body T, and the upper end thereof is closed. opening a firestop structure upper refractory a ₂ is closed is filled.
[0027]
Therefore, in case of fire below the slab S is extends to both the flame heat the bottom and sides of the lower refractory member A _1, and said lower refractory A ₁ are thermally foamed and expanded The lower opening of the through-hole H is completely closed within a short time, and the lower end portion of the metallic through-hole cylinder T is completely surrounded by the lower refractory material A ₁ that has been expanded by thermal foaming. It will not reach. This phenomenon, combined with the fact that the upper end of the through cylinder T is located far away from the upper surface of the slab S and has a structure that is difficult to transfer heat, It becomes difficult for flame heat to be transmitted, and the temperature of the upper end thereof is not so high, and the exposed portion of the cable C above the upper refractory material A ₂ is not spread. Further, the lower refractory material support D ₁ has its suspended plate portion 23 in contact with the inner side surface of the penetrating cylindrical body T, but is made of a thin metal plate, and most of the suspended plate portion 23 is As described above, the fact that the contact area with the through cylinder T is cut out and contributes to preventing the spread of the exposed portion of the cable C.
[0028]
Further, in the above embodiment, by using two types of refractory material supports D ₁ and D ₂ on the lower side and the upper side, the central portion of the through cylinder T is not filled with the refractory material, and the space portion However, since the heat transfer has little to do with whether or not the space portion 5 is filled with the refractory material, by leaving the space portion 5 left, the wasteful refractory material is used. There is an advantage that it is not necessary to use. However, in the present invention, it is also possible to fill the entire space portion in the through cylinder T with the refractory material without leaving the space portion 5 in the through cylinder T. The portions filled in the upper end portion and the lower end portion of the refractory material continuous in the direction correspond to the “upper refractory material” and the “lower refractory material” in the present invention.
[0029]
Further, according to the following construction method, when the slab is placed, the through hole H into which the lower end portion of the through cylinder T is inserted is simultaneously formed, and the lower refractory material support tool is formed on the inner peripheral surface of the through hole H. It is also possible to attach D ₁ ′ together. That is, as shown in FIGS. 16 and 17, the lower refractory material support D ₁ ′ is provided with a space 42 through which the cable C can be inserted on the bottom surface, and support plate portions on both sides of the space 42. 43 is provided, a pair of embedded plate portions 45 are horizontally attached to the upper end portion of the box body 44 toward the outside, and a pair of fixed plate portions 46 are outwardly provided at the lower end portion thereof. It is the structure attached horizontally toward the.
[0030]
Then, as shown in FIG. 17, the lower refractory material support D ₁ ′ is fixed to the upper surface of the slab form 47 using a pair of fixing plate portions 46, The lower end of the cylindrical through-hole mold 48 whose upper surface is closed is inserted, and in this state, concrete is placed on the upper surface of the slab mold 47, and after the concrete is hardened, the through-hole mold When 48 is pulled upward, the mold 48 forms a through hole H ′ in the molded slab S, and the lower refractory material support D ₁ ′ is disposed at the lower end of the through hole H ′. Fixed.
[0031]
For this reason, as shown in FIG. 18, a plurality of lower refractory materials having a block shape as described above in a state where the cable C is inserted into the space 42 of the lower refractory material support D ₁ ′. Is inserted into the through-hole H ′, supported by the support D ₁ ′, and is liquid in the gap between the lower refractory material A ₁ ′ composed of a plurality of lower refractory materials and the cable C. When the refractory is filled, the lower opening of the through hole H ′ is closed. Then, 'by inserting the through-cylinder T a, the lower the lower refractory A _1' through hole H when supported by the upper surface of the lower end of the through tubular body T is by the lower refractory member A ₁ ' Even if a flame or the like is generated below the slab S due to the structure covered from below, the lower end of the through cylinder T is exposed and faces the lower opening of the through hole H ′. Disappear.
[0032]
In the above embodiment, the through-cylinder T, the support D ₁ for supporting the lower refractory member A ₁ that is located lower than the lower end of the through tubular body T is formed by a separate However, as shown in FIG. 19, it is also possible to integrally attach a pair of support tools D ₁ ″ to the lower end of the through cylinder T in a state of extending downward. Further, in the above embodiment, the slab S is attached to the slab S. When penetrating a plurality of cables C, in order to make the side plate portions of the plurality of through-cylinders T close to each other and minimize the gap formed between them, a rectangular tube-shaped through-cylinder is used. However, in the present invention, the shape of the through cylinder is not limited to a square cylinder, and may be a cylinder or the like.
[0033]
【The invention's effect】
The present invention, in the structure tube cable building slab is firestop using noncombustible made through cylindrical body a through portion that penetrates, at least the lower end portion of the lower refractory member, the lower end of the through cylinder Since a flame is generated below the slab, it is possible to prevent a flame from entering the inside of the through cylinder from the lower end of the through cylinder, and to suppress the temperature rise of the through cylinder. And, in turn, contributes to the prevention of the spread of the tube / cable exposed part on the slab.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a portion of a through hole H of a slab S having a fireproof compartment processing structure according to the present invention.
FIG. 2 is also a plan view.
3 is an enlarged cross-sectional view taken along line XX in FIG.
FIG. 4 is an exploded perspective view of each member constituting the fire prevention compartment processing structure according to the present invention.
FIG. 5 is a perspective view in which a part of a through cylinder T is broken.
FIG. 6 is a perspective view of a plurality of through cylinders T and through holes H into which lower ends thereof are inserted.
7 is a perspective view showing a state in which the insides of a plurality of through cylinders T in which lower ends are inserted into through holes H are heated. FIG.
FIG. 8 is a partially enlarged cross-sectional view showing that the inorganic thermal foaming filler 1 applied to the outer peripheral surface of the lower end portion of the through cylinder T inserted into the through hole H is thermally foamed and the surrounding gap is closed. FIG.
FIG. 9 is a perspective view showing a state in which the lower refractory material A ₁ is filled into a plurality of through cylinders T whose lower ends are inserted into the through holes H.
FIG. 10 is a longitudinal sectional view of the same filled state.
FIGS. 11A and 11B are plan views of a state in which only the lower refractory material A ₁ is filled and a state in which a liquid refractory agent is filled in the gap with the cable C, respectively.
12 is a cross-sectional view taken along line YY of FIG.
FIG. 13 is a perspective view showing a state in which the upper refractory material A ₂ is filled into a plurality of through cylinders T whose lower ends are inserted into the through holes H. FIG.
FIG. 14 is a partially enlarged perspective view of the same filled state.
FIGS. 15A and 15B are plan views of a state in which only the upper refractory material A ₂ is filled and a state in which a liquid refractory agent is filled in a gap with the cable C, respectively.
16 is a perspective view of a lower refractory material support D ₁ ′ and a through hole mold 48. FIG.
FIG. 17 is a cross-sectional view of a method for forming a through hole H ′ at the same time when the slab S is formed by using the lower refractory material support D ₁ ′ and the through hole mold 48;
FIG. 18 is a cross-sectional view of a fire prevention compartment processing structure using a through hole H ′ in which a lower refractory material support D ₁ ′ is integrally attached to a lower end portion.
FIG. 19 is a perspective view of a through cylinder T that is integrally attached to a lower end with a pair of support tools D ₁ ″ extending downward.
[Explanation of symbols]
A ₁ : Lower refractory material
A _2: upper refractory material
A ₃ : Filled refractory material
C: Cable D ₁ , D ₁ ', D ₁ ": Lower refractory support
D ₂ : Upper refractory support
H: Through hole (penetrating part)
S: Slab
T: Through cylinder
1: Inorganic thermal foaming filler (fireproof foaming agent)
4: Clearance between the through hole and the through cylinder
5: Space
12: Fixed piece
22: Hook of lower refractory support

Claims (5)

It is a fire compartment processing structure of a penetrating part through which pipes and cables penetrate a building slab ,
A tube / cable penetrating the penetrating part;
The tube / cable is penetrated into the inside , the lower end is disposed in the penetration without protruding from the lower opening of the penetration, and the through cylinder made of incombustible material fixed to the slab ;
On the upper side of the through cylinder, an upper refractory material filled between the inner peripheral surface of the through cylinder and the tube / cable ;
In order to prevent the lower end of the through cylinder from being exposed and facing the lower opening in the event of a fire at least below the slab , at least the lower end is disposed below the lower end of the through cylinder. a lower refractory material that will be filled in the through portion as is in, to close the through lower side is,
A fireproof compartment processing structure for a tube / cable penetration, characterized by comprising: The lower refractory material is dropped into the through cylinder and is supported by a metal lower refractory support that is hooked on the upper end of the through cylinder. The fire / compartment processing structure of the penetration part of the pipe and cable of 1. The fire / compartment processing structure for a pipe / cable penetration part according to claim 1, wherein an upper end part of the lower refractory material is fitted inside a lower end part of the penetration cylinder . The lower refractory material is supported by a support tool disposed at a lower end portion of a through hole formed in a slab of a building, and a lower end surface of the through cylinder is configured to abut on an upper surface of the lower refractory material. The fire / compartment processing structure of the pipe / cable penetration part according to claim 1 characterized by the above-mentioned. 2. The tube / cable according to claim 1, wherein the lower refractory material is supported by a pair of support members that are integrally attached to a lower end of the penetrating cylindrical body in a downwardly extending state. Fire prevention compartment processing structure of the penetration part.

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