JP5950680B2 - Steel frame fireproof coating structure - Google Patents

Description

  The present invention relates to a steel frame fireproof covering structure.

Buildings such as detached houses, apartment houses, high-rise buildings, and various commercial facilities are formed from a plurality of building materials, and steel frames are one of the typical building materials used for buildings.
When this steel frame is exposed to heat such as a fire, the strength of the steel frame is greatly reduced even at a temperature that does not reach the melting point of iron, which is the main component of the steel frame.
When the steel frame is exposed to heat such as a fire, the steel frame buckles before reaching a temperature of 1500 ° C. or higher at which the steel frame melts, and cannot maintain a certain shape. As a result, the building may collapse.
If a building is easily collapsed by heat from a fire or the like, it will hinder evacuation and firefighting activities. Therefore, it is required to provide an appropriate fireproof coating for steel frames used for building materials.
Specific standards required for steel frames include fire resistance performance standards according to Ministry of Land, Infrastructure, Transport and Tourism Notification No. 2999, JIS A 1304, etc., and the fireproof covering structure of steel frames is required to satisfy this standard.

As one of the prior arts corresponding to the above criteria, a structure in which a fireproof board in which a non-combustible material and a thermally expandable fireproof sheet are laminated is arranged along the outer periphery of a plurality of steel frames, and the plurality of steel frames are covered with a fireproof board. Is known (Patent Document 1).
With this steel frame fireproof coating structure, a plurality of steel frames can be covered with a thin fireproof board in which a thermally expandable fireproof sheet is laminated, so that a plurality of steel frames can be protected from heat such as fire.

JP 2008-121376 A

Although the conventional steel fireproof coating structure described above is excellent in fire resistance, the inventors have found that it has a new problem.
FIG. 40 is a schematic cross-sectional view for explaining a problem of a conventional steel fireproof covering structure.
FIG. 40 schematically shows a cross-sectional view of the steel fireproof covering structure installed inside the hollow wall 42 forming the section of the building, cut along a plane parallel to the ground.
By covering the entire outer periphery of the steel frame 200 with a fireproof board 210 in which a heat-expandable fireproof sheet is laminated on the steel frame 200, the conventional steel fireproof coating structure 220 shown in FIG. 11 is obtained.
Since a fireproof board 210 in which a heat-expandable fireproof sheet is laminated is installed on the outer periphery of the steel frame 200, in the structure in which the fireproof coating structure 220 of the steel frame is stored inside the hollow wall 42, the inside of the hollow wall 42 If the width is narrow, it is necessary to form the protrusions 44 and 44 in the hollow wall 42.
When the protrusions 44 are formed on the wall of a room such as a house or office, there is a problem that the installation of furniture, shelves, cabinets and the like along the wall of the room is restricted.

FIG. 41 is a schematic cross-sectional view for explaining a problem of a conventional steel fireproof covering structure.
In the case of FIG. 40, the steel fireproof covering structure 220 is installed inside the hollow wall 42. On the other hand, in the case of FIG. 41, the steel frame fireproof covering structure 220 is installed along the hollow wall 45.
As shown in FIG. 41, in order to install the steel frame 220, it is necessary to provide an opening 46 on one surface of the hollow wall 45 which is a partition.
However, when the opening 46 is provided in the hollow wall 45 that is a partition, the function of the hollow wall 45 that is supposed to perform the function of blocking flames, smoke, and the like such as a fire is impaired, and a fire or the like is caused from the opening 46. The flame, smoke, etc. enter the hollow wall 45.
For this reason, although the fire resistance of the steel frame 200 is enhanced by the steel fireproof covering structure 220, when the opening 46 is provided in the hollow wall 45 which is a partition, the entire building in which the steel fireproof covering structure 220 is installed. There is also a problem that the fire resistance of the steel becomes low.

Furthermore, when the present inventors examined, it became clear that there was a new problem.
42 to 44 are schematic cross-sectional views for explaining problems to be solved by the present invention.
As shown in FIG. 42, a steel frame 1 installed in the vicinity of an outer wall 5 forming a partition of a building is covered with a heat-expandable fireproof sheet 10, and both ends 12a and 12b of the heat-expandable fireproof sheet are formed on the outer wall. 5 is fixed by an embedded bolt.
The thermally expandable fireproof sheet 10 used in the steel fireproof covering structure 300 shown in FIG. 42 has a non-combustible material layer and a thermally expandable resin composition layer laminated thereon.
When the incombustible material layer included in the thermally expandable fireproof sheet 10 is disposed outside, the steel fireproof covering structure 300 is included in the thermally expandable fireproof sheet 10 when exposed to heat such as a fire. A space for expanding the thermally expandable resin composition layer to be expanded is not prepared in advance.
For this reason, expansion | swelling of the said thermally expansible fireproof sheet 10 for protecting the said steel frame 1 is prevented, and sufficient expansion | swelling residue is not formed, but there exists a problem which cannot fully exhibit the heat insulation function by the said expansion | swelling residue.

Contrary to the case of the steel frame fireproof covering structure 300 shown in FIG. 42, the thermally expandable fireproof sheet 10 is turned over, and the incombustible material layer is disposed inside and the thermally expandable resin composition layer is disposed outside. What is the steel fireproof covering structure 310.
FIG. 43 is a schematic cross-sectional view for explaining a state in which the steel fireproof covering structure 310 is exposed to heat such as a fire.
Unlike the case of FIG. 42, since the thermally expandable resin composition layer contained in the thermally expandable fireproof sheet 10 expands outward, there is nothing that hinders the expansion of the thermally expandable fireproof sheet 10. A sufficient expansion residue 40 is formed.
However, the thermally expandable refractory sheet 10 installed on each side surface of the steel frame 1 forms the expansion residue 40 relatively uniformly. However, the expansion residue 40 is not uniformly formed at the corners of the steel frame 1. There is.
When cracks 41 and the like are present in the expansion residue 40, a flame such as a fire reaches the steel frame through the cracks 41 and the steel frame 1 is heated earlier than when the thermal expansion residue 40 is uniformly formed. There is a problem that will be done.

FIG. 44 shows a cross-sectional view of a steel fireproof covering structure 320 in which the thermal expansion fireproof sheet 10 is loosened in the case of the steel fireproof covering structure 300 shown in FIG.
As shown in FIG. 45, by installing the stretched fireproof sheet 10 in a relaxed manner, the thermally expandable fireproof sheet 10 expands when the steel fireproof covering structure 320 is exposed to heat such as a fire. The space for this can be provided in advance.
However, when the steel fireproof covering structure 320 is installed with the thermally expandable fireproof sheet 10 loosened, an appropriate amount of slack is formed only by observing the steel fireproof covering structure 320 from the outside. It is difficult to determine whether the steel fireproof covering structure 320 actually constructed can exhibit the fireproof performance as designed.
Further, if the thermally expandable fireproof sheet 10 is slack, there may be a problem due to interference with other building members such as piping and wiring installed around the steel frame 1.
Further, if the thermally expandable fireproof sheet 10 is loosened, there is a problem that the appearance of the steel fireproof covering structure 320 is deteriorated.
As described above, there is a contradictory relationship between keeping the volume of the steel fireproof covering structure small and improving the fire resistance of the steel fireproof covering structure.

  The object of the present invention is to be able to keep the volume small before being exposed to heat such as a fire, and to form a sufficiently thick expansion residue when the steel frame is exposed to heat such as a fire. An object of the present invention is to provide a fireproof coating structure for steel.

As a result of intensive studies by the inventors to solve the above problems,
The steel frame installed in contact with the compartment or spaced apart from the compartment is covered with a heat-expandable fireproof sheet, and both ends of the heat-expandable fireproof sheet covering the steel frame are formed by combustible fixing auxiliary plates. The present inventors have found that the steel fireproof coating structure that is pushed from the outside in the direction of the compartment and fixed to the compartment by the fixing means meets the purpose of the present invention, and has completed the present invention.

That is, the present invention
[1] a steel frame installed in contact with or spaced from the compartment;
A thermally expandable fireproof sheet covering the steel frame;
A combustible fixing auxiliary plate for pressing both ends of the thermally expandable fireproof sheet from the outside in a partition direction;
Fixing means for fixing both ends of the thermally expandable fireproof sheet to the compartment;
Comprising at least
Both ends of the heat-expandable fireproof sheet covering the steel frame are pushed in the direction of the compartment from the outside by the combustible fixing auxiliary plate and fixed to the compartment by a fixing means, respectively. A covering structure is provided.

One of the present invention is
[2] The fixing means includes a main body portion for fixing the fixing means to the compartment, and a support portion for preventing the thermally expandable refractory sheet from falling off the compartment by the fixing means. The fireproof covering structure for a steel frame according to the above [1] is provided.

One of the present invention is
[3] The steel frame fireproof covering structure according to [1] or [2], wherein the thermally expandable fireproof sheet covers the steel frame while maintaining tension.

One of the present invention is
[4] At least one of a combustible material and a non-combustible material is installed on the steel frame,
The thermally expandable fireproof sheet provides a fireproof covering structure for a steel frame according to any one of the above [1] to [3], which covers a steel frame on which at least one of the combustible material and the noncombustible material is installed. is there.

One of the present invention is
[5] The incombustible material is made of at least one inorganic material,
The fireproof covering structure for a steel frame according to the above [4], wherein the combustible material comprises at least one selected from the group consisting of paper material, natural resin and synthetic resin.

One of the present invention is
[6] The steel fireproof covering structure according to the above [4] or [5], wherein at least one of the incombustible material and the combustible material is a plate-like body or a columnar body.

One of the present invention is
[7] The above [4] to [4], wherein the incombustible material is at least one of an inorganic fiber plate and an inorganic fiber column, and the combustible material is a foamed synthetic resin plate and a foamed synthetic resin column. 6]. A fireproof covering structure for a steel frame according to any one of [6].

One of the present invention is
[8] The steel frame is a steel frame having an H-shaped cross section composed of two flanges facing each other in parallel and a single web connecting the flanges at both ends.
The steel fireproof covering structure according to any one of the above [1] to [7], wherein an outer surface of at least one of the two flanges is installed in contact with the section. .

One of the present invention is
[9] An expander is installed on the steel frame having the H-shaped cross section,
The heat-expandable fireproof sheet provides the steel fireproof covering structure according to the above [8], which covers a steel frame having an H-shaped cross section in which the expansion tool is installed.

One of the present invention is
[10] The expansion tool is installed at at least one end portion of the other flange different from the flange installed in contact with the section among the two flanges included in the steel frame having an H-shaped cross section. The steel frame fireproof covering structure according to the above [9] is provided.

One of the present invention is
[11] The expansion tool has a flange mounting portion,
The flange mounting portion of the extension tool has an installation groove that substantially matches the outer shape of the end of the flange having the H-shaped cross section,
The steel frame fireproof covering structure according to the above [10], wherein the extension tool is installed at an end of the steel flange by inserting the steel flange into the installation groove.

One of the present invention is
[12] The flange mounting portion of the expansion tool has an installation groove that can be inserted into the flange end,
Either of the above [10] or [11], wherein the installation groove provided in the flange mounting portion of the extension tool is fitted to the flange end portion in a state where a part or all of the installation groove is deformed. A fireproof covering structure for a steel frame as described above is provided.

One of the present invention is
[13] By deforming a part or all of the installation groove provided in the flange mounting portion of the expansion tool, a stress is generated in which the deformed installation groove tries to return to the shape before the deformation. the installation groove provided in the flange mounting portion of the dilator and said flange end is fixed, there is provided a fireproofing structure steel according to any one of the above [10] to [12] .

One of the present invention is
[14] The expansion tool is a support tool having a flange mounting portion and a plate-like body support portion,
A plate-like body is supported by the support, and is installed on both sides of the steel frame along the end faces of the two flanges of the steel frame,
The flange mounting portion of the support is installed at the flange end of the steel frame,
The steel frame fireproof covering structure according to any one of the above [9] to [13], wherein the plate-like body support portion of the support tool supports the plate-like body.

One of the present invention is
[15] The steel frame fireproof coating according to [14], wherein the installation groove provided in the flange mounting portion of the support is at least one selected from the group consisting of the following (1) to (5): Provide structure.
(1) An installation groove (2) in which a protrusion is provided on at least one of the inner surface (a) and the other inner surface (b) of the installation groove provided in the flange mounting portion of the support. An installation groove in which the opening of the installation groove becomes narrower in a continuous or stepwise manner from the inner surface (c) at the back of the installation groove provided in the flange mounting portion of the support tool toward the opening of the installation groove ( 3) Installation groove in which at least one surface of one inner surface (a) and the other inner surface (b) facing each other of the installation groove provided in the flange mounting portion of the support has a bent portion (4) the support Installation in which at least one of the inner surface (a) and the other inner surface (b) facing each other of the installation groove provided in the flange mounting portion of the tool is combined with the installation groove (5) plate material having the corrugated portion Plate material that is a groove and forms the installation groove At least installation groove which one is in contact inclined to said flange

One of the present invention is
[16] The support includes a main body plate and two opposing side surface plates installed at both ends of the main body plate,
The side plate has a support part and a flange holding part,
The flange mounting portion of the support tool includes a main body plate portion on the side of the main body plate on which the side plate is installed, a support portion of the side plate, and a flange holding portion of the side plate,
The installation groove provided in the flange mounting portion of the support tool is surrounded by the main body plate portion on the side where the side plate is installed, the support portion of the side plate, and the flange holding portion of the side plate. Formed by a notch,
A notch is formed at the joint between the side plate support portion and the side plate flange holding portion so that the flange holding portion of the side plate can be inclined with respect to the side plate support portion,
Either [14] or [15] above, wherein the plate-like body support portion of the support is formed by a main body plate portion of the main body plate opposite to the side on which the side plate is installed. The steel fireproof covering structure described in 1. is provided.

One of the present invention is
[17] The steel fireproof covering structure according to any one of [14] to [16], wherein a part of the support is inserted into the plate-like body.

One of the present invention is
[18] The expansion tool is installed to protrude outward from both ends of the two flanges in a space surrounded by the two flanges and the web included in the steel frame having an H-shaped cross section,
The steel frame fireproof as described in [9] above, wherein the expansion tool is at least one selected from the group consisting of an inorganic fiber plate, an inorganic fiber column, a foamed synthetic resin plate, and a foamed synthetic resin column. A covering structure is provided.

The steel frame fireproof covering structure of the present invention is provided with a thermally expandable fireproof sheet on the outer periphery of the steel frame, and both ends of the thermally expandable fireproof sheet are pressed from the outside by the combustible fixing auxiliary plate, and the fixing means It is obtained by fixing a heat-expandable fireproof sheet to the compartment.
Moreover, the fireproof covering structure of the steel frame of the present invention can also be obtained by installing a heat-expandable fireproof sheet on the outer periphery of the steel frame provided with at least one of a noncombustible material and a combustible material.
As described above, the steel frame fireproof covering structure of the present invention can be easily constructed.

Since the steel frame fireproof covering structure of the present invention is obtained by covering the steel frame with a heat-expandable fireproof sheet, it is easy even when other building members such as piping and wiring are present around the steel frame. Can be installed.
On the other hand, if there are no other building members such as pipes and wiring around the steel frame, at least one of non-combustible material and combustible material can be used together. The fire resistance against can be further increased.

Moreover, when the tension | tensile_strength of the said heat-expandable fireproof sheet is maintained and the said heat-expandable fireproof sheet is installed in the circumference | surroundings of the said steel frame, it can prevent that the said heat-expandable fireproof sheet loosens.
For this reason, there is no slackness in the thermally expandable fireproof sheet, and the volume of the steel fireproof covering structure of the present invention can be minimized. Thereby, the problem which arises by interference with other building members, such as piping and wiring installed around the said steel frame, can be avoided.
Furthermore, if there is no slack of the said thermally expansible fireproof sheet, the external appearance of the fireproof covering structure of the steel frame which concerns on this invention will also improve.

Further, when the steel fireproof covering structure of the present invention is exposed to heat such as fire, the thermally expandable fireproof sheet included in the steel fireproof covering structure of the present invention expands. At this time, the combustible fixing auxiliary plate is melted and burned down by heat from a fire or the like.
On the other hand, the state in which the said thermally expansible fireproof sheet is being fixed to the division by the said fixing means is maintained.
When the combustible fixing auxiliary plate that has pressed the thermally expandable fireproof sheet from the outside in the partition direction disappears, both ends of the thermally expandable fireproof sheet pressed by the combustible fixing auxiliary plate are slackened.
This slack creates a new space between the thermally expandable fireproof sheet and the steel frame. The inside of this space is closed by an expansion residue due to the thermally expandable fireproof sheet generated by heat such as a fire.
This loosening allows the expansion residue to expand freely without being hindered, so that when the steel frame fireproof coating structure of the present invention is exposed to heat such as a fire, the resulting expansion residue cracks, etc. This can be prevented, and a dense expansion residue can be formed around the steel frame.
Further, since an expansion residue having a sufficient thickness is generated around the steel frame, it is possible to delay the transfer of heat such as fire to the steel frame. Excellent.

FIG. 1 is a schematic cross-sectional view for explaining a construction method for a steel fireproof covering structure according to a first embodiment. FIG. 2 is a schematic cross-sectional view for explaining the construction method of the steel fireproof covering structure according to the first embodiment. FIG. 3 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the first embodiment. FIG. 4 is a schematic cross-sectional view for explaining a state after the steel frame fireproof covering structure according to the first embodiment is exposed to heat such as a fire. FIG. 5 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the second embodiment. FIG. 6 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the third embodiment. FIG. 7 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a fourth embodiment. FIG. 8 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a fifth embodiment. FIG. 9 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a sixth embodiment. FIG. 10 is a perspective view for explaining the shape of the expander used in the present invention. FIG. 11 is a perspective view for explaining the shape of the expander used in the present invention. FIG. 12 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a seventh embodiment. FIG. 13: is a schematic cross section for demonstrating the construction method of the fireproof coating structure of the steel frame which concerns on Example 7. FIG. FIG. 14 is a schematic cross-sectional view for explaining a construction method for the steel fireproof coating structure according to the seventh embodiment. FIG. 15 is a perspective view for explaining the shape of the support used in the present invention. FIG. 16 is a perspective view for explaining the shape of the support used in the present invention. FIG. 17 is a perspective view for explaining the shape of the support used in the present invention. FIG. 18 is a perspective view for explaining the shape of the support used in the present invention. FIG. 19 is a perspective view for explaining the shape of the support used in the present invention. FIG. 20 is a perspective view illustrating a modified example of the support. FIG. 21 is a perspective view illustrating a modification of the support. FIG. 22 is a cross-sectional view illustrating a modification of the support. FIG. 23 is a perspective view illustrating a modification of the support. FIG. 24 is a perspective view illustrating a modification of the support. FIG. 25 is a perspective view illustrating a modification of the support. FIG. 26 is a plan view illustrating a modified example of the support. FIG. 27 is a perspective view for explaining an embodiment of a support used in the present invention. FIG. 28 is a plan view illustrating a modified example of the support. FIG. 29 is a perspective view for explaining an embodiment of a support used in the present invention. FIG. 30 is a schematic perspective view for explaining a state where the support used in the present invention is installed on the steel frame. FIG. 31 is a schematic perspective view for explaining a state in which the support used in the present invention is installed on the steel frame. FIG. 32 is a plan view for explaining a modified example of the support used in the present invention. FIG. 33 is a plan view for explaining a modification of the support 600. FIG. 34 is a perspective view for explaining a modified example of the support 600. FIG. 35 is a plan view for explaining a modification of the support 600. FIG. 36 is a perspective view for explaining a modified example of the support 600. FIG. 37 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to an eighth embodiment. FIG. 38 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the ninth embodiment. FIG. 39 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the tenth embodiment. FIG. 40 is a schematic cross-sectional view for explaining a conventional steel frame fireproof covering structure. FIG. 41 is a schematic cross-sectional view for explaining a conventional steel fireproof covering structure. FIG. 42 is a schematic cross-sectional view for explaining a problem to be solved by the present invention. FIG. 43 is a schematic cross-sectional view for explaining a problem to be solved by the present invention. FIG. 44 is a schematic cross-sectional view for explaining a problem to be solved by the present invention.

The steel fireproof covering structure according to the present invention will be described below. First, the sections used in the present invention will be described.
Examples of the compartment include a building wall, a partition wall, a floor, a ceiling, and the like, a steel plate provided in a waterproof compartment of a ship and a cabin.
Examples of the material used for the compartment include concrete, cement, an inorganic fiber mat formed with inorganic fibers, an inorganic fiber board formed with inorganic fibers, and a heat-resistant panel.

  Examples of the inorganic fiber mat material include paper making of inorganic fibers such as glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, and zirconia fiber. The mat material etc. obtained in this way are mentioned.

  As the inorganic fiber board, for example, a glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, zirconia fiber and other inorganic fibers as a sintering agent, Examples include boards obtained by molding using thermoplastic resins, adhesives, and the like.

Examples of the heat resistant panel include a cement panel and an inorganic ceramic panel.
Examples of the cement-based panel include hard wood piece cement boards, inorganic fiber-containing slate boards, lightweight cellular concrete boards, mortar boards, and precast concrete boards.
Examples of the inorganic ceramic panel include a gypsum board, a calcium silicate board, a calcium carbonate board, a mineral wool board, and a ceramic board.

  Here, as the gypsum board, specifically, a lightweight material such as saw dust or pearlite is mixed into calcined gypsum, and cardboard is pasted on both sides and molded. ), Decorative gypsum board (JIS A6911 compliant: GB-D), waterproof gypsum board (JIS A6912 compliant: GB-S), reinforced gypsum board (JIS A6913 compliant: GB-F), sound-absorbing gypsum board (JIS A6301 compliant: GB) -P) and the like.

  The inorganic fiber mat, inorganic fiber board, heat-resistant panel, etc. can be used singly or in combination.

Examples of the compartment for storing the steel frame used in the present invention include a hollow wall having a space inside.
Examples of the hollow wall include those having a structure in which the heat-resistant panel or the like is fixed to a frame material such as a metal frame or a steel frame.
There is no limitation in the division used for this invention, The division normally used for a building etc. can be used.

Next, the steel frame used in the present invention will be described.
The steel frame used in the present invention is a kind of structural material used for structures such as detached houses, apartment houses, high-rise buildings, school buildings, commercial facilities, ships, etc. Examples thereof include an upright member that stands upright with respect to the ground and supports the load applied from above, a horizontal member that is installed horizontally with respect to the ground such as a beam, and the like.

The shape of the steel frame is, for example, an elongated body having a H-shaped, C-shaped, or I-shaped cross section, a cylinder without a space inside, a polygonal column, an elliptical column, a cylinder with a space inside, a polygonal tube, an elliptical cylinder, etc. Is mentioned.
Specific examples of the steel frame having an H-shaped cross section include, for example, a steel frame having an H-shaped cross section composed of two flanges facing each other in parallel and a single web connecting the flanges at both ends.
The shape of the steel column is preferably a rectangular column, a square tube, or an elongated body having an H-shaped cross section from the viewpoints of economy, workability, and the like.

The material of the steel frame may include, for example, in addition to iron, metals such as aluminum other than iron, concrete, inorganic materials such as cement, wood, etc., for example, a combination of reinforcing bars and cement, It is also possible to use a combination of two or more materials in which a reinforcing bar is combined with a noncombustible material panel.
As the incombustible material panel, for example, the same materials as those used for the fireproof incombustible material described later can be used.

Next, the thermally expandable fireproof sheet used in the present invention will be described.
The heat-expandable fireproof sheet used in the present invention is formed by molding a heat-expandable resin composition containing a resin component such as an epoxy resin or rubber, a phosphorus compound, heat-expandable graphite, an inorganic filler, etc. into a sheet shape. Is.
The thermally expandable fireproof sheet may be a laminate of one or more incombustible material layers such as inorganic fiber sheets such as glass cloth, metal foils such as aluminum foil and copper foil.

Examples of the inorganic fiber used in the inorganic fiber sheet include glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, and zirconia fiber. .
The inorganic fiber layer preferably uses an inorganic fiber cloth using the inorganic fiber.
Moreover, it is preferable to use what laminated the metal foil for the inorganic fiber used for the said inorganic fiber sheet.
As specific examples of the metal foil laminated inorganic fiber, for example, aluminum foil laminated glass cloth, copper foil laminated glass cloth and the like are more preferable.

  The heat-expandable fireproof sheet can be obtained, for example, by laminating a metal foil layer, an inorganic fiber layer, a heat-expandable resin layer, and the like. In addition to melt coextrusion, hot pressing, etc., these layers may include means for attaching each layer with an adhesive.

There is no limitation in the structure of the thermally expansible fireproof sheet used for this invention, The structure containing a several noncombustible material layer, a thermally expansible resin composition layer, etc. may be sufficient.
Examples of the incombustible material layer include a metal foil layer and an inorganic fiber layer.
The thermally expandable refractory sheet has a structure in which a thermal expansion residue formed by expansion of the thermally expandable resin composition layer when supported by heat such as fire is supported by a non-combustible material layer on the surface. There is no particular limitation.

If the specific example of the structure of the said thermally expansible fireproof sheet is given, for example,
(1) Incombustible material layer-thermally expandable resin composition layer (2) Incombustible material layer-thermally expandable resin composition layer-incombustible material layer (3) Incombustible material layer-thermally expandable resin composition layer-incombustible material layer -Thermally expandable resin composition (4) Incombustible material layer-Incombustible material layer-Thermally expandable resin composition layer-Incombustible material layer-Incombustible material layer (5) Incombustible material layer-Thermally expandable resin composition layer-Incombustible material Examples of the layer-thermally expandable resin composition layer-incombustible material layer-thermally expandable resin composition layer-incombustible material layer.
The heat-expandable fireproof sheet used in the present invention preferably has an incombustible layer on the outermost surface, and more preferably has a metal foil layer on the outermost surface.

Commercially available products can be used as the heat-expandable fireproof sheet, for example, Sekisui Chemical Co., Ltd. Fibrok etc. (registered trademark. Epoxy resin or rubber is used as a resin component, and includes a phosphorus compound and an inorganic filler. Sheet-like molded article of resin composition, sheet-like molded article of thermally expandable resin composition containing said resin component, phosphorus compound, foaming material and inorganic filler, etc., said resin component, phosphorus compound, thermally expandable graphite and inorganic It is possible to obtain and use a sheet-like molded product of a thermally expandable resin composition containing a filler and the like.
In addition, when using the said heat-expandable fireproof sheet containing the said heat-expandable graphite, it is preferable that the said heat-expandable graphite uses neutralized heat-expandable graphite.

  The thermally expandable refractory sheet expands due to heat such as a fire to form an expansion residue. This expansion residue blocks a flame such as a fire against the steel frame. For this reason, even if a fire or the like occurs, it is possible to prevent the strength of the steel frame from being lowered.

Next, the combustible fixing auxiliary plate used in the present invention will be described.
The combustible fixing auxiliary plate is used when fixing both ends of the thermal expansion refractory sheet in the compartment direction in the order of compartment-thermally expandable refractory sheet-flammable fixation auxiliary plate, etc., by fixing means described later.
The combustible fixing auxiliary plate does not necessarily have to be in contact with the compartment and may be fixed to the steel frame or the like as long as both ends of the thermally expandable fireproof sheet can be pressed from the outside.

The shape of the combustible fixing auxiliary plate is not limited as long as both ends of the heat-expandable fireproof sheet can be fixed to the compartment, but may be a plate-like body so that it can be easily fixed to the compartment. preferable.
Specific examples of the plate-like body include, for example, a plate-like long body installed in the longitudinal direction of the steel frame used in the present invention, a plurality of plate-like columnar bodies installed corresponding to individual fixing means, Examples include plate-like polygons and plate-like elliptic cylinders.
It is preferable that the combustible fixing auxiliary plate is installed in parallel to the section in the longitudinal direction of the steel frame.
Further, it is more preferable to use a combustible fixing auxiliary plate having a through hole for fixing to a partition or the like by a fixing means.

  The combustible fixing auxiliary plate may be any shape as long as the thermally expandable fireproof sheet can be pressed from the outside, and it may be intermittently installed in the longitudinal direction of the steel frame in parallel with the compartment. It can also be installed parallel to the compartment in the longitudinal direction of the steel frame.

As the combustible fixing auxiliary plate, one that deforms when heated by a fire or the like is used.
The deformation of the combustible fixing auxiliary plate is preferably accompanied by a decrease in volume, more preferably the deformation or the deformation accompanied by a decrease in volume starts at a temperature before and after the thermally expandable refractory sheet starts to expand. It is more preferable that the combustible fixing auxiliary plate is deformed or deformed with a decrease in volume at a temperature lower than the thermal expansion start temperature of the expandable refractory sheet.
By using the combustible fixing auxiliary plate that deforms at a temperature lower than the thermal expansion start temperature of the thermally expandable refractory sheet, the combustible fixing auxiliary plate is expanded by the thermal expansibility before the thermal expandable refractory sheet expands. While holding the fireproof sheet, it is possible to prevent the position of the thermally expandable fireproof sheet from fluctuating.

  Usually, the thermally expandable refractory sheet used in the present invention starts to expand in a temperature range of 80 to 300 ° C., but the combustible fixing auxiliary plate used in the present invention matches the expansion start temperature of the thermally expandable refractory sheet, It is preferable to select one that deforms in a temperature range that does not hinder its thermal expansion.

It is preferable to use the combustible fixing auxiliary plate whose volume decreases while being deformed by shrinkage, melting, outflow, vaporization, decomposition, burning, etc. in a temperature range of 60 to 550 ° C. It is more preferable if the volume decreases while deforming at a temperature not higher than the thermal expansion start temperature.
Even if the combustible fixing auxiliary plate is deformed by heat of fire or the like, and the combustible fixing auxiliary plate is damaged, the thermally expandable fireproof sheet expands, and the expansion residue due to the thermally expandable fireproof sheet becomes the combustible The space including the fixed auxiliary plate is closed.

Next, the fixing means used in the present invention will be described.
When the steel frame fireproof coating structure according to the present invention is exposed to heat such as a fire, the fixing means is not limited to the thermal expansion property even when the steel frame is heated to the same temperature as the temperature at which the steel frame loses strength and buckles. The state which fixed the fireproof sheet to the division is maintained.
In the present invention, the thermally expandable refractory sheet may be fixed in contact with the section by a fixing means or may be fixed at intervals.

Examples of the fixing means used in the present invention include a screw, a tucker, a welding pin, a bolt, and a tapping screw.
The material of the fixing means is preferably a non-combustible material such as metal.

  Next, in the present invention, at least one of a combustible material and a noncombustible material is installed on a part or all of the steel frame, and then the steel frame on which at least one of the combustible material and the noncombustible material is installed is covered with a thermally expandable fireproof sheet. You can also.

  Examples of the combustible material used in the present invention include those formed of one or more of paper materials, natural resins, synthetic resins and the like.

As the paper material, for example, a fibrous material or chemical fiber taken out from a plant such as wood is dispersed in a dispersion medium such as water, and this is filtered to form a uniform layer and then dried paper or the like. Can be mentioned.
Examples thereof include processed paper obtained by applying paint, water repellent and the like to the paper, corrugated cardboard in which corrugated paper is sandwiched between flat papers called liners, and the like.

  Examples of the natural resin include cellulose derivatives, gelatin, alginates, chitosan, pullulan, pectin, carrageenan, proteins, tannins, lignin, rosin acid and the like, polymers, waxes, waxes, natural rubbers and the like. It is done.

Examples of the synthetic resin include isoprene rubber, butadiene rubber, 1,2-polybutadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, Synthetic rubber such as silicone rubber, fluoro rubber, urethane rubber, polyisobutylene rubber, butyl chloride rubber,
Polyolefin resins such as polypropylene resin, polyethylene resin, poly (1-) butene resin, polypentene resin,
Polystyrene resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, acrylic resin, polyamide resin, polyvinyl chloride resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene ether resin, wholly aromatic polyester resin, polyethersulfone resin, phenol resin , Polyurethane resin, epoxy resin and the like.

  When using the combustible material, it is preferable to use a combustible plate-like body. Among them, it is more preferable to use a synthetic resin plate-like body because it is easy to handle and is easy to obtain, and has a bubble shape inside. Since the foam is excellent in heat insulation, it is more preferable to use the plate-like foam.

  When the plate-like foam is used, the volume of the plate-like foam is reduced by melting, burning, etc. due to heat from fire or the like, so that the expansion of the thermally expandable fireproof sheet can be prevented. .

  Examples of the non-combustible material used in the present invention include those formed of inorganic materials.

Examples of the inorganic material include rock wool, ceramic wool, silica alumina fiber, alumina fiber, silica fiber, zirconia fiber, and ceramic blanket.
By using the inorganic material, it is possible to delay the arrival of heat such as a fire to the steel column.

When using the non-combustible material, it is preferable to use a non-combustible plate.
Specific examples of the incombustible plate-like body include, for example, an inorganic fiber mat formed with inorganic fibers, an inorganic fiber board formed with inorganic fibers, and the like.
The non-combustible plate is preferably a flexible material.
Specific examples of the non-combustible material are the same as in the case of the section described above.

Next, the extension tool used in the present invention will be described.
The expansion tool used for this invention is installed in a steel frame. By installing the extension tool on the steel frame, a space can be provided between the steel frame and the heat-expandable fireproof sheet when the steel frame is covered with the heat-expandable fireproof sheet.

  There is no particular limitation on the shape of the expansion tool, and the thermally expandable fireproof sheet can be expanded between the steel frame and the thermally expandable fireproof sheet by the heat of a fire or the like by being installed on the steel frame. A space that can be provided can be appropriately selected and used.

The extension tool is deformed when heated by a fire or the like, similar to the combustible fixing auxiliary plate described above, with respect to those installed at the corners of the steel frame, such as the flange end of the steel frame having an H-shaped cross section. It is preferable to use what to do.
The deformation of the expander is preferably accompanied by a decrease in volume, more preferably the deformation or the deformation accompanied by a decrease in volume starts at a temperature before and after the thermally expandable refractory sheet starts to expand, and the thermal expandability It is further preferable that deformation of the expander or deformation accompanying a decrease in volume starts at a temperature lower than the thermal expansion start temperature of the refractory sheet.

For example, when the fireproof covering structure of a steel frame according to the present invention is exposed to heat such as a fire by installing the extension tool at a corner portion of the steel frame, the case of the combustible fixing auxiliary plate described above and Similarly, the expansion tool is deformed by heat from a fire or the like.
Even if the expander is damaged, the thermally expandable fireproof sheet expands, and the expansion residue due to the thermally expandable fireproof sheet closes including the space where the expander existed.

Further, when the steel frame having the H-shaped cross section is used as the steel frame, an inorganic fiber columnar body, foam as an expansion tool is formed in the space surrounded by the two flanges and the web forming the steel frame having the H-shaped cross section. A synthetic resin columnar body or the like can be inserted, or a plurality of inorganic fiber plate bodies, foamed synthetic resin plate bodies, or the like can be stacked and inserted as an expansion tool.
The expansion tool may be installed by protruding from the space surrounded by the two flanges and the web to the outside of the end portions of the two flanges.

When the expansion tool is not installed on the steel frame, a space for smoothly expanding the thermally expandable fireproof sheet is provided at a corner of the steel frame where the thermally expandable fireproof sheet and the steel frame are in close contact with each other. Therefore, there is a possibility that an expansion residue having a sufficient thickness cannot be formed quickly around the steel frame.
By installing the extension tool on the steel frame in advance, an expansion residue having a sufficient thickness can be quickly formed around the steel frame. .

Next, the support used in the present invention will be described.
The support device is, for example, for facilitating the installation of a plate-like body made of at least one of a combustible material and a non-combustible material around the steel frame, such as a steel frame having an H-shaped cross section. Of these, at least a flange mounting portion and a plate-like body support portion are provided.
The flange attachment portion of the support is installed on the flange of the steel frame having an H-shaped cross section, and the plate-like body supporting portion of the support is supported by the plate-like body made of at least one of the combustible material and the non-combustible material. Thus, a plate-like body made of at least one of the combustible material and the non-combustible material can be simply installed on the steel frame having the H-shaped cross section.
If necessary, a part of the support can be inserted into a plate-like body made of at least one of the combustible material and the non-combustible material.

  Hereinafter, the present invention will be described in detail based on examples with reference to the drawings. In addition, this invention is not limited at all by the following examples.

1 to 2 are schematic cross-sectional views for explaining a construction method of a steel frame fireproof covering structure according to a first embodiment. FIG. 3 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the first embodiment.
1 to 8 schematically illustrate a cross section of the steel frame 1 and the thermally expandable refractory sheet 10 cut along a plane perpendicular to the longitudinal direction of the steel frame 1 used in the first embodiment.
The steel frame 1 is installed in a direction perpendicular to the ground and has a function as a pillar in a building. Moreover, the 1st division 5 shown by FIG. 1 has a function as a wall in a building.
The steel frame 1 and the first section 5 are installed at an interval.
The heat-expandable fireproof sheet 10 used in Example 1 was obtained from Sekisui Chemical Co., Ltd. (registered trademark Fibro).
The thermally expandable fireproof sheet 10 is formed by laminating a thermally expandable resin composition layer and an aluminum foil laminated glass cloth.
First, as shown in FIG. 1, the steel frame 1 is formed so that the thermally expandable fireproof sheet 10 has a thermally expandable resin composition layer on the inside, and an aluminum foil is the outermost layer and the aluminum foil laminated glass cloth is on the outside. Covered.

Next, as shown in FIG. 2, the end portions 12 a and 12 b of the thermally expandable fireproof sheet 10 are pressed in the direction of the first section 5 by the combustible fixing auxiliary plate 20, and then embedded bolts 30 are used. Fixed to the first compartment 5.
As shown in FIG. 2, the embedded bolt 30 has a main body portion 31 and a support portion 32.
After the through holes 33 are provided in the end portions 12 a and 12 b of the combustible fixing auxiliary plate 20 and the thermally expandable fireproof sheet 10, the body portion 31 of the embedded bolt 30 is connected to the combustible fixing auxiliary plate 20 and the thermally expandable plate. The fireproof sheet 10 was inserted into the through holes 33 of the end portions 12 a and 12 b and embedded in the first compartment 5.
The embedded bolt 30 is provided with a support portion 32 for preventing the thermally expandable fireproof sheet 10 from falling off.
The support portion 32 of the embedded bolt 30 has an expanded structure that can support the thermally expandable fireproof sheet 10 in parallel with the first section 5. Since the support portion 32 of the embedded bolt 30 supports the thermally expandable fireproof sheet 10, it is possible to prevent the thermally expandable fireproof sheet 10 from falling off from the steel fireproof covering structure 100 according to the first embodiment. .

In Example 1, a polyethylene plate was used as the combustible fixing auxiliary plate 20.
The combustible fixing auxiliary plate 20 was installed in the first section 5 so as to be parallel to the steel frame 1 in the longitudinal direction of the steel frame 1. As the combustible fixing auxiliary plate 20, one that is continuous in the longitudinal direction of the steel frame 1 may be used, or one that is intermittent in the longitudinal direction of the steel frame 1 may be used.
When the combustible fixing auxiliary plate 20 that is intermittent in the longitudinal direction of the steel frame 1 is used, the combustible fixing auxiliary plate 20 is installed at the position of the embedded bolt 30 used for the first section 5. Is preferred.

FIG. 3 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the first embodiment.
As shown in FIG. 3, the end portions 12 a and 12 b of the thermally expandable fireproof sheet 10 covering the steel frame 1 are pushed from the outside toward the first section 5 by the combustible fixing auxiliary plate 20, respectively. It is fixed to the first section 5 by fixing means for the embedded bolt 30.
The heat-expandable fireproof sheet 10 is installed while maintaining tension on the steel frame 1. For this reason, the thermally expandable fireproof sheet 10 covering the steel frame 1 has no slack.
As shown in FIG. 3, the steel frame fireproof covering structure 100 according to the first embodiment can be easily constructed.

FIG. 4 is a schematic cross-sectional view for explaining a state after the steel frame fireproof covering structure according to the first embodiment is exposed to heat such as a fire.
When the steel fireproof covering structure 100 according to the first embodiment is exposed to heat such as a fire, the combustible fixing auxiliary plate 20 is lost due to melting, burning, or the like.
As a result, the thermally expandable fireproof sheet 10 covering the steel frame 1 is loosened, and a new space is created between the steel frame 1 and the thermally expandable fireproof sheet 10.
On the other hand, when the steel fireproof covering structure 100 according to the first embodiment is exposed to heat such as fire, the thermally expandable fireproof sheet 10 expands to form an expansion residue 40.
The expansion residue 40 closes a new space between the steel frame 1 and the heat-expandable fireproof sheet, which is generated when the heat-expandable fireproof sheet 10 is loosened.
Since the thermally expandable fireproof sheet 10 is slack, there is nothing that prevents the expansion of the thermally expandable fireproof sheet 10, and the steel frame 1 can be covered with the expansion residue 40.
For this reason, the steel fireproof covering structure 100 according to Example 1 is excellent in fire resistance.

FIG. 5 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the second embodiment.
The steel fireproof covering structure 110 according to the second embodiment is a modification of the steel fireproof covering structure 100 according to the first embodiment.
Compared to the steel fireproof covering structure 100 according to the first embodiment, the steel fireproof covering structure 110 according to the second embodiment has a synthetic resin foam plate-like body 50 made of polyurethane around the steel frame 1. It differs in that it is installed on four sides and the thermally expandable fireproof sheet 10 covers the periphery of the steel frame 1 on which the synthetic resin foamed plate-like body 50 is installed.
When the steel fireproof covering structure 110 according to the second embodiment is exposed to heat such as a fire, the combustible fixing auxiliary plate 20 is lost due to melting, burning or the like as in the first embodiment.
As a result, the thermally expandable fireproof sheet 10 covering the steel frame 1 is loosened, and a new space is created between the steel frame 1 and the thermally expandable fireproof sheet 10.
Furthermore, when the synthetic resin foamed plate-like body 50 is melted or burnt out, another new space is generated between the thermally expandable fireproof sheet 10 and the steel frame 1.
For this reason, when the steel fireproof covering structure 110 according to the second embodiment is exposed to heat such as a fire, the thermally expandable fireproof sheet 10 has less obstacles to hinder expansion, so the steel frame according to the first embodiment is reduced. Compared with the case of the fireproof covering structure 100 of the above, it expands more smoothly.
Therefore, the steel fireproof covering structure 110 according to the second embodiment is excellent in fire resistance.

FIG. 6 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the third embodiment.
The steel fireproof covering structure 120 according to the third embodiment is a modification of the steel fireproof covering structure 100 according to the first embodiment.
The steel fireproof covering structure 120 according to the third embodiment is different from the steel fireproof covering structure 100 according to the first embodiment in that the steel frame 1 is installed in contact with the first section 5.
Moreover, in the case of Example 1, the said heat-expandable fireproof sheet 10 was wound around the steel frame 1 directly. On the other hand, in the case of Example 3, the inorganic fiber board 60 which consists of rock wool is installed with respect to the two surfaces which the steel frame 1 opposes.
The steel fireproof covering structure 120 according to the third embodiment shown in FIG. 6 can be thinned in the A and B directions and thickened in the C and D directions.
Thus, even if it is a case where increasing thickness only in the specific direction of the steel frame 1 is restrict | limited, the fireproof covering structure 120 of the steel frame which concerns on Example 3 can be constructed easily.

FIG. 7 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a fourth embodiment.
The steel fireproof covering structure 130 according to the fourth embodiment is a modification of the steel fireproof covering structure 100 according to the first embodiment.
In the case of Example 1, the steel frame 1 was in the shape of a square cylinder. On the other hand, in the case of Example 4, as the steel frame 1a, one having a cross-sectionally H-shaped structure is used.
The steel frame 1 a includes two flanges 2 and 3 and one web 4.
Of the two flanges 2 and 3, the upper flange 2 and the lower flange 3 face each other in parallel, and both ends of the web 4 are connected to central portions of the upper flange 2 and the lower flange 3.
This steel frame 1a is publicly known, and a commercially available product can be appropriately selected and used.

Here, the steel frame 1a has a function as a beam for supporting the second section 6 such as a floor or a ceiling of a building, and the bolt, welding or the like directly with the second section 6 or via a metal connecting member or the like. (Not shown).
Although FIG. 7 illustrates the case where the steel frame 1a is installed in the horizontal direction as a beam or the like, the steel frame fireproof covering structure of the present invention is similarly applied to the case where the steel frame 1a is installed in the vertical direction as a column or the like. It is possible to form.
The horizontal direction refers to a direction on a plane parallel to the ground with respect to the ground. The vertical direction refers to a direction based on the ground.

  As shown in FIG. 7, even when the steel frame to be used is replaced with a steel frame having a different shape, the steel fireproof covering structure 130 according to the fourth embodiment can be easily applied.

Further, when the steel fireproof covering structure 130 according to the fourth embodiment is exposed to heat such as a fire, the combustible fixing auxiliary plate 20 is lost due to melting, burning or the like as in the first embodiment.
As a result, the thermally expandable fireproof sheet 10 covering the steel frame 1a is loosened, and a new space is created between the steel frame 1a and the thermally expandable fireproof sheet 10.
On the other hand, when the steel fireproof covering structure 130 according to Example 4 is exposed to heat such as fire, the thermally expandable fireproof sheet 10 expands to form an expansion residue.
The expansion residue 40 closes a new space between the steel frame 1a and the thermally expandable refractory sheet 10, which is generated when the thermally expandable refractory sheet 10 is loosened.
Since the thermally expandable fireproof sheet 10 is slack, there is nothing that prevents the expansion of the thermally expandable fireproof sheet 10, and the steel frame 1a can be covered with the expansion residue 40.
For this reason, the steel fireproof covering structure 130 according to Example 4 is excellent in fire resistance.

FIG. 8 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a fifth embodiment.
The steel fireproof covering structure 140 according to the fifth embodiment is a modification of the steel fireproof covering structure 130 according to the fourth embodiment.
In the case of Example 4, the heat-expandable fireproof sheet 10 was directly wound around the steel frame 1a. On the other hand, in the case of Example 5, the inorganic fiber board 60 which consists of rock wool is installed with respect to the outer surface of the flange 3 of the steel frame 1a.
The steel fireproof covering structure 140 according to Example 5 shown in FIG. 8 can be thickened in the A and B directions and thinned in the C and D directions.
Thus, even if it is a case where increasing thickness only in the specific direction of the steel frame 1 is restrict | limited, the fireproof covering structure 140 of the steel frame which concerns on Example 5 can be constructed easily.

FIG. 9 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a sixth embodiment.
The steel fireproof covering structure 150 according to the sixth embodiment is a modification of the steel fireproof covering structure 130 according to the fourth embodiment.
In the case of Example 4, the thermally expandable fireproof sheet 10 directly covered the steel frame 1a. On the other hand, in the case of Example 6, the expansion tools 7 and 7 are each installed with respect to the edge parts 3a and 3c of the flange 3 of the steel frame 1a.
For this reason, it can prevent that the flange 3 of the said steel frame 1a and the said heat-expandable fireproof sheet 10 contact | connect directly.
The expanders 7 are made of polyethylene, and melt and burn out when exposed to heat such as fire.
When the expansion tools 7 and 7 are melted or burnt out, another new space is generated between the thermally expandable fireproof sheet 10 and the steel frame 1.
For this reason, when the steel fireproof covering structure 150 according to Example 6 is exposed to heat such as fire, the thermally expandable fireproof sheet 10 is compared with the case of the steel fireproof covering structure 130 according to Example 4. And expand more smoothly.
For this reason, the steel fireproof covering structure 150 according to Example 6 is excellent in fire resistance.

Here, a specific example of the expansion tool that can be used in the present invention will be described.
10 and 11 are perspective views for explaining the shape of the expander used in the present invention.
As illustrated in FIGS. 10 and 11, examples of the shape of the expander used in the present invention include shapes such as a sphere, a cube, a rectangular parallelepiped, and a cylinder, a quadrangular column, a polygonal column, and the like.
In the present invention, those having a length of less than 200 mm in the longitudinal direction are expressed as a rectangular parallelepiped, and those having a length of 200 mm or more in the longitudinal direction are expressed as a rectangular column, a polygonal column, or the like.

The extension tool illustrated in FIGS. 10 and 11 includes an installation groove 80. The installation groove 80 is provided for installing the expansion tool at the flange end of the steel frame 1a.
In the case of FIGS. 10 and 11, when the size of the opening of the installation groove is narrower than the thickness of the flange of the steel frame, by deforming a part or all of the installation groove 80 of the extension tool, The end of the steel flange used in the present invention can be inserted into the installation groove 80.

FIG. 12 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to a seventh embodiment.
The steel fireproof covering structure 160 according to the seventh embodiment is a modification of the steel fireproof covering structure 130 according to the fourth embodiment.
Compared with the steel fireproof covering structure 130 according to the fourth embodiment, the steel fireproof covering structure 160 according to the seventh embodiment uses the support members 70 and 70 and the inorganic fiber boards 60 and 60 as non-combustible plates. Is different.

Supporters 70 are installed at both ends of the lower flange 3. Each of the supports 70 and 70 has a flange mounting portion 71 and a plate-like body support portion 72.
The flange mounting portion 71 of the support 70, 70 has an installation groove that substantially matches the outer shape of the end of the lower flange 3, and the lower flange 3 is inserted into the installation groove so that the lower flange 3 is inserted. Supports 70, 70 can be installed at both ends of the flange 3.

The plate-like body support portions 72 of the support tools 70 and 70 are installed so as to protrude outward from both ends of the lower flange 3 in the horizontal direction.
Here, projecting out from the lower flange 3 means having an extended portion on the outside of the steel frame 1a with both ends of the lower flange 3 as a reference.
The portions of the support members 70 and 70 that protrude to the outside and are installed on the steel frame 1 a are a part of the flange mounting portion 71 and a plate-like body support portion 72.

In addition, inorganic fiber boards 60 and 60 as non-combustible plates are respectively installed on both sides of the steel frame along the end faces 2a, 3a, 2b and 3c of the two flanges 2 and 3 of the steel frame 1a.
Here, the meaning of being along the end face of the flange includes both the case where it is in contact with the end face of the flange and the case where it is spaced from the end face of the flange.
In FIG. 12, the plate-like body support portion 72 of the support members 70 and 70 supports the inorganic fiber boards 60 and 60 as non-combustible plate-like bodies.
Moreover, a part of the flange attaching part 71 of the said support tools 70 and 70 is each inserted in the inside of the inorganic fiber boards 60 and 60 as said incombustible plate-like body.

  In the case of the steel frame fireproof covering structure 160 according to the seventh embodiment, the inorganic fiber boards 60 and 60 as non-combustible plates are formed on the end faces 2a, 3a, 2b and 3b of the two flanges 2 and 3 of the steel frame 1a. It is installed in contact.

13 to 14 are schematic cross-sectional views for explaining a construction method of the steel frame fireproof covering structure 160 according to the seventh embodiment.
The support 70 used in Example 7 is made of polypropylene.
In Example 7, a rock wool board having a rectangular cross section is used as the inorganic fiber board 60 as the incombustible plate-like body.

The lower end surface of the inorganic fiber board 60 as the non-combustible plate-like body is brought into contact with the plate-like body support portion 72 of the support tool 70 so that the support tool 70 is placed on the inorganic fiber board 60 side as the non-combustible plate-like body. When pushed in, a part of the flange mounting portion 71 of the support 70 is inserted into the inorganic fiber board 60 as the incombustible plate-like body.
When the material of the inorganic fiber board 60 used as the incombustible plate-like body is rock wool, the flange mounting portion 71 of the support 70 is relatively easily embedded in the inorganic fiber board 60 as the incombustible plate-like body. It is possible.
In addition, when the inorganic fiber board 60 as the incombustible plate-like body to be used is a hard material, a part of the flange mounting portion 71 of the support 70 is previously placed inside the inorganic fiber board 60 as the incombustible plate-like body. An insertion hole may be provided so that the insertion hole can be inserted.
Further, a part of the flange mounting portion 71 of the support 70 is not necessarily embedded in the inorganic fiber board 60 as the incombustible plate-like body, but if embedded, the inorganic fiber board 60 as the incombustible plate-like body is used. It is preferable because it can be easily attached to the steel frame 1.

As shown in FIG. 14, the steel frame 1 a is installed in the second section 6.
In Example 7, an ALC plate is used as the second compartment 6. In addition, the steel frame 1a is fixed to the compartment 6 by embedded bolts (not shown).
By inserting the flange mounting portion 71 of the support 70 into the end surfaces 3a, 3c of the lower flange of the steel frame 1a, the inorganic fiber board 60 as the non-combustible plate-like body is formed on the flanges 2, 3 of the steel frame 1a. It can be installed along the flange end faces 2a, 3a, 2b, 3c.
The left and right sides of the steel frame 1 can be covered with the inorganic fiber board 60 as the incombustible plate-like body.

Next, after covering the steel frame 1a, the supports 70, 70 and the inorganic fiber boards 60, 60 as the non-combustible plate-like body with the thermally expandable fireproof sheet 10 without gaps, as in the case of the first embodiment. The end portions 12 a and 12 b of the thermally expandable fireproof sheet 10 were pressed by the combustible fixing auxiliary plate 20 and then fixed to the second section 6 using the embedded bolts 30.
As shown in FIG. 12, the embedded bolt 30 has a main body portion 31 and a support portion 32.
After the through holes 33 are provided in the end portions 12 a and 12 b of the combustible fixing auxiliary plate 20 and the thermally expandable fireproof sheet 10, the body portion 31 of the embedded bolt 30 is connected to the combustible fixing auxiliary plate 20 and the thermally expandable plate. The fireproof sheet 10 was inserted into the through holes 33 of the end portions 12 a and 12 b and embedded in the second compartment 6.

The steel fireproof covering structure 160 according to the seventh embodiment can be easily constructed.
Moreover, even if it is a case where increasing thickness only in the outer surface direction of the flange 3 of the steel frame 1a is restrict | limited, the fireproof coating structure 160 of the steel frame which concerns on Example 7 can be constructed easily.

Next, details of the support used in the present invention will be described.
FIGS. 15-21 is a perspective view for demonstrating the shape of the support tool used for this invention.
As illustrated in FIG. 15 and FIG. 16, examples of the shape of the flange mounting portion of the support used in the present invention include shapes such as a sphere, a cube, a rectangular parallelepiped, a cylinder, a quadrangular column, a polygonal column, and the like. It is done.

15 and 16 each have a flange attachment portion 71 and a plate-like body support portion 72, and the flange attachment portion 71 has an end of a flange of a steel frame used in the present invention. An installation groove 80 that substantially matches the outer shape of the part is provided.
Moreover, the said plate-shaped body support part 72 becomes a plate shape which can support the said incombustible plate-shaped body.

Moreover, as illustrated in FIGS. 17 and 18, the installation groove may include a step 80 a.
When the step 80a is installed on the steel frame 1a, the step 80a can be installed on both ends of the flange 3 of the steel frame 1 with a heat-resistant adhesive tape or the like.
In addition, the plate-like body can be supported by the plate-like plate-like body support portion 72.

The support 70 illustrated in FIG. 18 is provided with steps 80b and 80c at both ends, which are installed on the steel frame 1a by fitting them to the end of the upper flange 2 and the end of the lower flange 3 respectively. can do.
In addition, the plate-like body can be supported by the plate-like plate-like body support portion 72.

As illustrated in FIG. 19, the support used in the present invention includes flange mounting portions 73 and 73 for insertion into a steel flange, and a connecting member 74 for connecting the flange mounting portions 73 and 73 to each other. You may have.
In addition, the plate-like body can be supported by the plate-like plate-like body support portion 72.

The flange mounting portion of the support tool used in the present invention has an installation groove, but the support tool has an installation groove whose opening groove size is narrower than the thickness of the flange of the steel frame. can do.
The installation groove included in the flange mounting portion of the support is inserted into the end of the steel flange used in the present invention by deforming part or all of the installation groove included in the flange mounting portion of the support. Is possible.
Specifically, the support tool can be installed at the end of the flange by expanding the installation groove and inserting it into the end of the flange of the steel frame.

Here, the relationship between the thickness of the flange of the steel frame and the size of the opening of the installation groove will be described.
The size of the opening of the installation groove is based on the thickness Tmm of the flange of the steel frame, and the size of the opening of the installation groove is the narrowest in the thickness direction of the flange of the steel frame (T-1 ) To (T-30) mm.
The size of the opening of the installation groove is preferably in the range of (T-5) to (T-20) mm, and more preferably in the range of (T-5) to (T-10) mm. .

When part or all of the installation groove included in the flange mounting portion of the support is deformed, the opening of the installation groove may be widened.
The expansion tool is caused by a stress caused by the deformation of the installation groove 80 included in the flange mounting portion of the support tool, so that the installation groove 80 included in the flange mounting portion of the deformed support tool returns to the shape before the deformation. The installation groove 80 and the flange end can be fixed.
The point which can fix the installation groove | channel 80 of the said expansion tool and the said flange edge part with the said stress is the same also in the case of the following support tools.

20, FIG. 21 and FIG. 23 to FIG. 25 are perspective views illustrating modifications of the support described in FIG. 15 and FIG. FIG. 22 is a cross-sectional view illustrating a modified example of the support described in FIGS. 15 and 16.
In addition to the installation groove 80, the spherical support illustrated in FIG.
The installation groove 80 illustrated in FIG. 20 (a ′) is formed by one inner surface 90, the other inner surface 91, and a back inner surface 92 of the installation groove 80 included in the flange mounting portion of the support. In addition, one inner surface 90 and the other inner surface 91 of the installation groove 80 included in the flange mounting portion of the support member are in a relationship of facing each other.

A protrusion 75 is provided on the inner surface 90 of the installation groove 80 included in the flange mounting portion of the spherical support. The protrusion 75 has a substantially conical shape with a spherical tip.
The shape of the protrusion used in the present invention is not limited, and can be appropriately selected and employed according to the purpose.

The distance between the inner surface 91 of the installation groove 80 included in the flange mounting portion of the sphere support and the tip of the protrusion 75 is smaller than the thickness of the flange end portion of the steel frame used in the present invention.
Therefore, when the installation groove 80 included in the flange mounting portion of the sphere support is installed at the flange end of the steel frame used in the present invention, the installation groove 80 included in the flange mounting portion of the sphere support is used. Then, the installation groove 80 included in the flange mounting portion of the sphere support is inserted into the end of the steel flange.

  The installation groove 80 included in the flange mounting portion of the deformed support tool, which is generated by deforming the installation groove 80 included in the flange mounting portion of the cubic support tool, is caused by the stress for returning to the shape before deformation. The installation groove 80 of the extension part and the flange end part can be fixed.

In addition to the installation groove 80, the cubic support illustrated in FIG.
The installation groove 80 illustrated in FIG. 20 (b ′) has one inner surface 90 and the other inner surface 91 of the installation groove included in the flange mounting portion 71 of the support as in the case of FIG. 20 (a ′). It is formed by a back inner surface 92.
Protrusions 76 and 76 are provided on the inner surfaces 90 and 91 of the installation groove 80 included in the flange mounting portion 71 of the cubic support, respectively. The shape of the protrusions 76 is a rectangular parallelepiped.

The protrusion 76 installed on the inner surface 90 of the installation groove 80 included in the flange mounting portion 71 of the cubic support and the inner surface 91 of the installation groove 80 included in the flange mounting portion 71 of the cubic support. The distance from the projected portion 76 is smaller than the thickness of the flange end portion of the steel frame used in the present invention.
For this reason, when the installation groove 80 included in the flange mounting portion 71 of the cube support is installed at the flange end of the steel frame used in the present invention, the installation included in the flange mounting portion 71 of the cube support is used. After the groove 80 is widened, the installation groove 80 included in the flange mounting portion 71 of the cube support is fitted to the end of the steel flange.

  Due to the stress for the installation groove 80 included in the flange mounting portion 71 of the deformed support tool to return to the shape before the deformation caused by deforming the installation groove 80 included in the flange mounting portion of the cube support tool, The installation groove 80 of the extension part and the flange end part can be fixed in the same manner as in the case of the previous ball support.

The rectangular parallelepiped support illustrated in FIG. 20C ′ includes an installation groove 80.
The rectangular parallelepiped support illustrated in FIG. 20C ′ is installed in the flange mounting portion 71 of the cubic support similar to the cubic support illustrated in FIG. 20B ′. The projecting portion 76 installed on the inner surface 90 of the groove 80 and the projecting portion 76 installed on the inner surface 91 of the installation groove 80 included in the flange mounting portion 71 of the cubic support.
In the case of the cubic support illustrated in FIG. 20B ′, the protrusion 76 is disposed symmetrically inside the installation groove 80, but is illustrated in FIG. 20C ′. In the case of a rectangular parallelepiped support, the protrusions 76 are different from each other in that they are alternately arranged on the inner surface 90 and the inner surface 91 of the installation groove 80.

In addition to the installation groove 80, the columnar support illustrated in FIGS.
Projections 77 are also installed in the installation groove 80 included in the flange mounting portion 71 of the columnar support. The distance between the protrusions 77 and 77 is narrower than the thickness of the steel frame, but is included in the flange mounting portion 71 of the front columnar support by widening the installation groove 80 included in the flange mounting portion 71 of the columnar support. The installed groove 80 can be fitted to the end of the steel flange.

FIG. 22 is a schematic cross-sectional view showing a modified example of the protruding portion installed in the installation groove included in the flange mounting portion of the support used in the present invention.
22 (j) and (k), at least of the inner surface 90 and the inner surface 91 among the inner surface 90, the inner surface 91 and the inner surface 92 of the installation groove 80 included in the flange mounting portion 71 of the support. The protrusion 77 can be installed on one side.

Moreover, as illustrated in FIGS. 22L and 22M, the inner surface 92 of the installation groove 80 included in the flange mounting portion 71 of the support tool is directed toward the opening of the installation groove 80 toward the opening portion. By narrowing the opening of the installation groove 80, the inner surface 90 and the inner surface 91 of the installation groove 80 included in the flange mounting portion 71 of the support are formed on the protrusion 77 illustrated in FIGS. 22 (j) and 22 (k). Similar functions can be provided.
The protrusions 77 illustrated in FIGS. 22 (j) and (k) bulge stepwise toward the opening of the installation groove 80, whereas in FIGS. 22 (l) and (m). The illustrated protrusions 82 are continuously raised toward the opening of the installation groove 80.

  Further, as illustrated in FIGS. 22 (n) and 22 (o), the installation groove 80 included in the flange mounting portion of the support is used as a protrusion that is installed in the installation groove 80 included in the flange mounting portion 71 of the support. A protrusion 79 having a flat surface portion and a protrusion 81 having a curved surface portion can be provided on at least one of the inner surface 90 and the inner surface 91 of the inner surface 90.

FIG. 23 to FIG. 25 are schematic perspective views showing modifications of the protrusions installed in the installation grooves included in the flange mounting part of the support used in the present invention.
In the case of the columnar support shown in FIG. 21 described above, the protrusion 72 is installed along the longitudinal direction of the columnar support. However, in the case of the columnar support exemplified in FIG. The difference is that the portions 76 are disposed in a direction perpendicular to the longitudinal direction of the columnar support with an interval.
In the case of the columnar support illustrated in FIG. 23, the projection 82 is provided on the inner surface 90 of the installation groove 80. However, the projection 82 may be installed also on the inner surface 91 of the installation groove 80. it can.

Further, as illustrated in FIG. 24, the support used in the present invention includes at least one of the inner surface 90 and the other inner surface 91 of the installation groove 80 included in the flange mounting portion 71 of the support, which are opposed to each other. A bent portion can be installed on one side.
The bent portion is formed in a shape in which a valley portion 83 and a mountain portion 84 are repeated. In addition, the shape including a plane may be sufficient as the said bending part.

Further, as illustrated in FIG. 25, the support used in the present invention includes at least one of the inner surface 90 and the other inner surface 91 of the installation groove 80 included in the flange mounting portion 71 of the support facing each other. A corrugated part can be installed on one side.
The corrugated portion may have a shape including a plane.

  By expanding the installation groove 80 included in the flange mounting portion 71 of the support illustrated in FIGS. 20 to 25, the support 10 can be fitted to the end of the steel flange.

  The support illustrated in FIGS. 20 to 25 has a flat plate-like body support portion 72, and can support the plate-like body using the plate-like body support portion 72.

26 and 28 are plan views for explaining a modification of the support used in the present invention, and FIGS. 27 and 29 are perspective views for explaining a modification of the support used in the present invention. is there.
As illustrated in FIGS. 26 and 27, the support 600 has a main body plate 610 and two opposing side plates 620 and 630 installed at both ends of the main body plate 610.

26, the side with the side plates 620 and 630 forms the flange mounting portion 71, and the side without the side plates 620 and 630 forms the plate-like body support portion 72.
Similarly, in the dashed line AA in FIG. 27, the side with the side plates 621 and 631 forms the flange mounting portion 71, and the side without the side plates 621 and 631 forms the plate-like body support portion 72.
The plate-like body can be supported by the plate-like body support portion 72.

The side plates 620 and 630 are connected to the main plate 610 so as to be bendable.
The side plates 620 and 630 have support portions 640 and 650 and flange holding portions 660 and 670, respectively.
The main body plate 610, the support portion 640 of the side plate 620, and the notch 680 surrounded by the flange holding portion 660 of the side plate 620, and the main plate 610, the support portion 650 of the side plate 630, and the side plate 630. A notch 690 surrounded by the flange holding portion 670 forms an installation groove for installation in the steel flange.

  Further, the flange holding portion 660 of the side plate 620 is tiltably connected to the support portion 640 of the side plate 620 at the joint between the support portion 640 of the side plate 620 and the flange holding portion 660 of the side plate 620. The flange holding portion 670 of the side plate 630 is inclined with respect to the support portion 650 of the side plate 630 at the joint between the notch 700 and the support portion 650 of the side plate 630 and the flange holding portion 670 of the side plate 630. An incision 710 is formed that connects in a possible manner.

A support 601 shown in FIGS. 28 and 29 is a modification of the support 600 shown in FIGS. 26 and 27.
In the support 601, end portions of the side plates 621 and 631 are rounded so as to facilitate installation work on the steel frame.

FIG. 30 and FIG. 31 are schematic perspective views for explaining a state where the support used in the present invention is installed on the steel frame.
As illustrated in FIG. 30, since the support 600 has an installation groove that matches the outer shape of the end of the flange 3 of the steel frame 1a, the installation groove is inserted into the end of the flange 3 of the steel frame 1a. By doing so, the said support tool 600 can be installed with respect to the said steel frame 1a.

  In addition, as illustrated in FIG. 31, the flange holding portion 660 of the side plate 620 is connected to the support portion 640 of the side plate 620 so as to be inclined, and therefore the flange holding portion 660 of the side plate 620. Is inclined with respect to the support portion 640 of the side plate 620, so that the support tool 600 is attached to the steel frame 1a even when the width of the installation groove is smaller than the thickness of the end of the flange 3 of the steel frame 1a. Can be installed at the end of the flange 3.

  Similarly, since the flange holding portion 670 of the side plate 630 is connected to the support portion 650 of the side plate 630 so as to be inclined, the flange holding portion 670 of the side plate 630 is connected to the support portion of the side plate 630. By tilting with respect to 650, the support 600 is installed at the end of the flange 3 of the steel frame 1a even if the width of the installation groove is narrower than the thickness of the end of the flange 3 of the steel frame 1a. can do.

FIG. 32 is a plan view for explaining a modified example of the support used in the present invention.
A support tool 604 illustrated in FIG. 32 illustrates a modification of the support tool 600.
The support 604 includes a main body plate 614 and two opposing side plates 624 and 634 installed at both ends of the main body plate 614.
The side surfaces 624 and 634 have support portions 644 and 654 and flange holding portions 664 and 674, respectively.
The main body plate 614, the notch 684 surrounded by the support portion 644 of the side plate 624 and the flange holding portion 664 of the side plate 624, and the support portion 654 of the main plate 614, the side plate 634, and the side plate 634. A notch 694 surrounded by the flange holding portion 674 forms an installation groove for installation on the flange of the steel frame.

In addition, a notch 704 for connecting the flange holding part 664b to the flange holding part 664a so as to be tilted and a notch 714 for connecting the flange holding part 674b to the flange holding part 674a so as to be able to tilt are formed.
When the steel flange end is inserted into the support 604, the flange holding portion 664b is deformed relative to the flange holding portion 664a.
Further, the flange holding portion 674b is deformed with respect to the flange holding portion 674a.
The support 604 can be fixed to the flange end portion of the steel frame by the stress when the deformed flange portion 664b and the flange portion 674b return to the original shape.

A support 602 shown in FIGS. 33 and 34 is a modification of the support 600 shown in FIGS. 26 and 27.
As illustrated in FIGS. 33 and 34, the support 602 includes a main body plate 612 and two opposing side plates 622 and 632 installed at both ends of the main body plate 612.
The side surfaces 622 and 632 are connected to the main body plate 612 so as to be bendable.
The side surfaces 622 and 632 have support portions 642 and 652 and flange holding portions 662 and 672, respectively.
The main body plate 612, the support portion 642 of the side surface plate 622, and the notch 682 surrounded by the flange holding portion 662 of the side surface plate 622, and the main body plate 612, the support portion 652 of the side surface plate 632, and the side surface plate 632 A notch 692 surrounded by the flange holding portion 672 forms an installation groove for installation on the flange of the steel frame.

As illustrated in FIG. 34, the installation groove formed by the notch 692 is formed by the inner surface 90, the inner surface 91, and the inner surface 92 at the back. The inner surface 91 of the installation groove is formed by the main body plate 612, and the inner surface 91 of the installation groove and the inner surface 92 of the back are each formed by the end surface of the side plate 632.
The opening of the installation groove is narrowed from the inner surface 92 of the installation groove included in the flange mounting portion of the support tool toward the opening of the installation groove.
When the support 602 is fitted to the flange end of the steel frame, the main body plate 612 and the side plates 622 and 632 are deformed.
The support tool 602 can be fixed to the flange end of the steel frame by the stress when the deformed main body plate 612 and the side plates 622 and 632 return to their original shapes.

A support 603 shown in FIGS. 35 and 36 is a modification of the support 602 shown in FIGS. 33 and 34.
The support 603 is provided with a protrusion on an inner surface 90 of an installation groove formed by the side plates 623 and 633 and the main body plate 613.
By installing this protrusion, the thickness of the installation groove formed by the notches 683 and 693 can be made narrower than the flange end of the steel frame.
By deforming the side plates 623, 633 and the main body plate 613, the support 603 can be fitted to the flange end of the steel frame.

FIG. 37 is a schematic cross-sectional view for explaining a steel frame fireproof covering structure according to an eighth embodiment.
The steel fireproof covering structure 170 according to the eighth embodiment is a modification of the steel fireproof covering structure 160 according to the seventh embodiment.
In the case of Example 7, after installing the said support tools 70 and 70 previously with respect to the inorganic fiber board 60 and 60 as an incombustible plate-like body, the inorganic fiber board 60 and 60 as the said incombustible plate-like body is used. It installed in the steel frame 1a.
On the other hand, in the case of the eighth embodiment, the support 70 is inserted into the steel frame 1a by first inserting the flange mounting portion 71 of the support 70 into the end surfaces 3a and 3c of the lower flange of the steel frame 1a. , 70 is installed, and the inorganic fiber boards 60, 60 as the incombustible plate-like body are attached to the steel frame 1a.
Other than that is the same as the case of Example 7.
Even if the support 70 is previously installed on the steel frame 1a, the steel fireproof covering structure 170 according to the eighth embodiment can be easily constructed, and the lower part of the steel frame 1a is replaced with a conventional steel fireproof covering structure. In comparison, it can be made thinner.

FIG. 38 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the ninth embodiment.
The steel fireproof covering structure 180 according to the ninth embodiment is a modification of the steel fireproof covering structure 130 according to the fourth embodiment.
In the case of Example 4, the combustible fixing auxiliary plate 20 was fixed to the second compartment 6 by the embedded bolt 30 while holding the thermally expandable fireproof sheet 10 from the outside.
On the other hand, Example 9 is different in that the combustible fixing auxiliary plate 20 is fixed to the steel frame 1a.
The combustible fixing auxiliary plate 20 can be fixed to the second section 6 via the steel frame 1a without being directly fixed to the second section 6 via the thermally expandable fireproof sheet 10.
The steel fireproof covering structure 180 according to the ninth embodiment is also excellent in fire resistance as in the case of the steel fireproof covering structure 130 according to the fourth embodiment.

  In the steel fireproof covering structure 180 according to the ninth embodiment, the fixing position of the thermally expandable fireproof sheet 10 is closest to the steel frame 1a, and the fixing means such as the embedded bolt 30 and the combustible fixing auxiliary plate 20 are provided. Proximity to the steel frame 1a. For this reason, other building members such as pipes and wirings can be easily installed around the steel frame 1a, and the influence of the periphery of the steel fireproof covering structure 180 according to the ninth embodiment can be minimized. .

FIG. 39 is a schematic cross-sectional view for explaining the steel frame fireproof covering structure according to the tenth embodiment.
The steel fireproof covering structure 190 according to the tenth embodiment is a modification of the steel fireproof covering structure 130 according to the fourth embodiment.
As shown in FIG. 39, an inorganic fiber columnar body 61 is inserted into a space surrounded by the two flanges 2 and 3 and the web 4 included in the steel frame 1a having an H-shaped cross section.
The inorganic fiber columnar body 61 is made of rock wool and protrudes from both end portions of the two flanges 2 and 3 to the outside. As described above, the inorganic fiber columnar body 61 has a function as an expansion tool.
The inorganic fiber columnar body 61 may have a length that continuously fills the space surrounded by the two flanges 2 and 3 and the web 4 in the longitudinal direction of the steel frame 1a. A plurality of ones of such a length that intermittently fills the space surrounded by the flanges 2 and 3 and the web 4 in the longitudinal direction of the steel frame 1a may be used.

As a modification of the tenth embodiment, for example, instead of the inorganic fiber columnar body 61, a foamed synthetic resin columnar body such as a polyurethane foam resin can be used.
Also, by using a plurality of laminated inorganic fiber plates made of rock wool, etc., foamed synthetic resin plates made of foamed polyurethane resin, etc., the same steel fireproof coating structure as in Example 10 is formed. can do.

DESCRIPTION OF SYMBOLS 1, 1a Steel frame 2, 3 Flange 2a, 2b, 3a, 3c End face of flange 4 Web 5 1st division 6 2nd division 7 Expansion tool 10 Thermal expansion fireproof sheet 12a, 12b End of thermal expansion resin composition Part 20 Combustible fixing auxiliary plate 30 Embedded bolt 31 Embedded bolt body part 32 Embedded bolt support part 50 Synthetic resin foam plate-like body 60 Inorganic fiber board 70 Support tool 71 Flange mounting part 72 Plate-like body support part 80 Installation groove 80a, 80b, 80c Level difference 90, 91 Inner surface 92 Inner inner surface 75-77 Protruding portion 83 Valley portion 84 Mountain portion 85 Corrugated portion 100, 110, 120, 130, 140, 150, 160, 170, 180, 190 Fireproof covering structure of steel frame 250, 300, 310, 320 Conventional steel fireproof coating structure 610, 611, 612, 614 Main plate 62 0,621,622,623,624,630,631,632,633,634 side plate 640,641,642,643,644,650,651,652,653,654 support 660,661,662,663 664, 664a, 664b, 670, 671, 672, 673, 674, 674a, 674b Flange holder 680, 681, 682, 683, 684, 690, 691, 692, 693, 694 Notch 700, 701, 704, 710 , 711,714

Claims (18)

A steel frame installed in contact with or spaced from the compartment; and
A thermally expandable fireproof sheet covering the steel frame;
A combustible fixing auxiliary plate for pressing both ends of the thermally expandable fireproof sheet from the outside in a partition direction;
Fixing means for fixing both ends of the thermally expandable fireproof sheet to the compartment;
Comprising at least
Both ends of the heat-expandable fireproof sheet covering the steel frame are pushed in the direction of the compartment from the outside by the combustible fixing auxiliary plate and fixed to the compartment by a fixing means, respectively. Covering structure.   The said fixing means is provided with the main-body part for fixing the said fixing means to a division, and the support part for preventing that the said thermal expansion fireproof sheet falls from a division by the said fixing means. A fireproof covering structure for steel frame as described in 1.   The steel fireproof covering structure according to claim 1 or 2, wherein the thermally expandable fireproof sheet covers the steel frame while maintaining a tension. At least one of a combustible material and a non-combustible material is installed on the steel frame;
The steel fireproof covering structure according to any one of claims 1 to 3, wherein the thermally expandable fireproof sheet covers a steel frame on which at least one of the combustible material and the noncombustible material is installed. The incombustible material is made of an inorganic material,
The steel fireproof covering structure according to claim 4, wherein the combustible material is made of at least one selected from the group consisting of paper, natural resin, and synthetic resin.   The fireproof covering structure for a steel frame according to claim 4 or 5, wherein at least one of the incombustible material and the combustible material is a plate-like body or a columnar body.   The incombustible material is at least one of an inorganic fiber plate and an inorganic fiber column, and the combustible material is a foamed synthetic resin plate and a foamed synthetic resin column. The steel fireproof coating structure described. The steel frame is a steel frame having an H-shaped cross section composed of two flanges facing in parallel and a single web connecting the flanges at both ends,
The steel fireproof covering structure according to any one of claims 1 to 7, wherein an outer surface of at least one of the two flanges is disposed in contact with the section. An extension tool is installed on the steel frame having the H-shaped cross section,
The steel fireproof covering structure according to claim 8, wherein the thermally expandable fireproof sheet covers a steel frame having an H-shaped cross section in which the expansion tool is installed.   The extension tool is installed at at least one end portion of the other flange different from the flange installed in contact with the partition among the two flanges included in the steel frame having the H-shaped cross section, The fireproof covering structure for steel frames according to claim 9. The expansion tool has a flange mounting portion;
The flange mounting portion of the extension tool has an installation groove that substantially matches the outer shape of the end of the flange having the H-shaped cross section,
The fireproof covering structure for a steel frame according to claim 10, wherein the extension tool is installed at an end of the flange of the steel frame by inserting the flange of the steel frame into the installation groove. The flange mounting portion of the extension tool has an installation groove that can be inserted into the flange end,
12. The steel frame according to claim 10, wherein an installation groove provided in a flange mounting portion of the extension tool is fitted to the flange end portion in a state where a part or all of the installation groove is deformed. Fireproof coating structure. By deforming part or all of the installation groove provided in the flange mounting portion of the extension tool, a stress is generated in which the deformed installation groove attempts to return to the shape before the deformation, and the stress causes the extension tool to be restored. The steel frame fireproof coating structure according to any one of claims 10 to 12, wherein an installation groove provided in the flange mounting portion and the flange end portion are fixed. The expansion tool is a support having a flange mounting part and a plate-like body support part,
A plate-like body is supported by the support, and is installed on both sides of the steel frame along the end faces of the two flanges of the steel frame,
The flange mounting portion of the support is installed at the flange end of the steel frame,
The steel frame fireproof covering structure according to any one of claims 9 to 13, wherein a plate-like body support portion of the support tool supports the plate-like body. The steel frame fireproof covering structure according to claim 14, wherein the installation groove provided in the flange mounting portion of the support is at least one selected from the group consisting of the following (1) to (5) .
(1) An installation groove (2) in which a protrusion is provided on at least one of the inner surface (a) and the other inner surface (b) of the installation groove provided in the flange mounting portion of the support. An installation groove in which the opening of the installation groove becomes narrower in a continuous or stepwise manner from the inner surface (c) at the back of the installation groove provided in the flange mounting portion of the support tool toward the opening of the installation groove ( 3) Installation groove in which at least one surface of one inner surface (a) and the other inner surface (b) facing each other of the installation groove provided in the flange mounting portion of the support has a bent portion (4) the support Installation in which at least one of the inner surface (a) and the other inner surface (b) facing each other of the installation groove provided in the flange mounting portion of the tool is combined with the installation groove (5) plate material having the corrugated portion Plate material that is a groove and forms the installation groove At least installation groove which one is in contact inclined to said flange The support has a main body plate and two opposite side plates installed at both ends of the main body plate,
The side plate has a support part and a flange holding part,
The flange mounting portion of the support tool includes a main body plate portion on the side of the main body plate on which the side plate is installed, a support portion of the side plate, and a flange holding portion of the side plate,
The installation groove provided in the flange mounting portion of the support tool is surrounded by the main body plate portion on the side where the side plate is installed, the support portion of the side plate, and the flange holding portion of the side plate. Formed by a notch,
A notch is formed at the joint between the side plate support portion and the side plate flange holding portion so that the flange holding portion of the side plate can be inclined with respect to the side plate support portion,
The steel plate fireproof according to claim 14 or 15, wherein the plate-like body support portion of the support tool is formed by a main body plate portion of the main body plate opposite to a side where the side plate is installed. Covering structure.   The steel frame fireproof covering structure according to any one of claims 14 to 16, wherein a part of the support is inserted into the plate-like body. The expansion tool is installed in a space surrounded by the two flanges and the web included in the steel frame having an H-shaped cross section and protrudes from both ends of the two flanges to the outside,
The steel frame fireproof coating according to claim 9, wherein the expansion tool is at least one selected from the group consisting of an inorganic fiber plate, an inorganic fiber column, a foamed synthetic resin plate, and a foamed synthetic resin column. Construction.