JP5918491B2 - Steel frame structure - Google Patents

Description

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

  As a conventional steel cover structure, there has been proposed a steel cover structure in which a fire-resistant covering unit formed by laminating a metal plate and a heat-expandable material layer is integrated and bent, and is fixed in advance through an extension tool attached to the steel frame. (Patent Document 1).

FIG. 29 is a schematic perspective view for explaining an extension tool used in a conventional steel frame covering structure.
FIG. 29A shows a perspective view of the extension tool 200. The horizontal portion 202, two L-shaped pieces 204 and 204 depending from the opposite ends of the horizontal portion 202, and the horizontal portion 202 are separated. A vertical piece 206 that hangs down from the end of each of them is provided, and an insertion portion 210 is formed between the horizontal portion 202 and the L-shaped pieces 204, 204. The shape of the horizontal portion 202 is a square or a rectangle.

  The material of the expansion tool 200 is preferably a metal. For example, the expansion tool 200 is manufactured by bending a steel plate, a galvanized steel plate, a stainless steel plate or the like punched into the shape shown in FIG. 29B along a broken line. be able to.

  FIG. 30 is a schematic cross-sectional view for explaining a conventional steel frame covering structure, and shows a structure in which a fireproof coating is applied to the H-shaped steel 100 supporting the floor slab 500.

First, one end of the flange 2 of the H-shaped steel 100 is inserted into the insertion portion 210 of the expander 200 to attach the expander 200 to the H-shaped steel 100, and the other end of the flange 2 of the H-shaped steel 100 is connected to another end. The extension tool 200 is attached to the H-shaped steel 100 by being inserted into the insertion portion 210 of the extension tool 200. In the same manner, further expansion tools 200 and 200 are attached to both flange 3 ends of the H-shaped steel 100, respectively.
With the above operation, a total of four expansion tools 200 are attached to the flanges 2 and 3 of the H-shaped steel 100, two each.

  Next, as shown in FIG. 30, by fixing the non-combustible material 300 to the expansion tool 200, three sides of the H-shaped steel 100 are covered with the non-combustible material 300, and then a metal plate and a thermally expandable material are placed on the gypsum board 310. The fireproof covering unit 320 made of is coated with the heat-expandable material layer side inside and fixed to the expansion tool 200. In this way, the conventional steel frame covering structure shown in FIG. 30 is obtained.

The conventional steel cover structure shown in FIG. 30 can be constructed by attaching a fireproof coating unit to the steel frame via the extension tool even when there are projections or the like on the steel frame. It is said that it can be constructed well.
However, in the case of the conventional steel frame covering structure described above, there is an advantage that it can be applied even when there are protrusions on the steel frame, but on the other hand, the metal plate and the thermally expandable material layer are laminated and integrated and bent. It was necessary to prepare a fireproof coating unit.
For this reason, construction may be difficult if there is a place where steel frames are complexly combined inside the building.

JP 2002-013224 A

  On the other hand, when the present inventors examined, when the steel-coated structure in which the steel frame was covered with the heat-expandable fireproof sheet was exposed to heat such as a fire, among the heat-expandable fireproof sheets covering the steel frame, the steel frame was vertically oriented. In the corner part that becomes the boundary between the covering part and the part that covers the steel frame in the horizontal direction, the expansion residue of the thermally expandable refractory sheet expanded by heat is cracked, or the thickness of the expansion residue is compared with the part other than the corner part I discovered that there was a problem of thinning.

  In addition, if there are multiple steel frames with different thicknesses when installing an extension tool on a steel frame, it may not be possible to install the extension tool. Conversely, after installing the extension tool, it can be easily expanded from the steel frame. It was also discovered that there is a problem that the construction of the steel-coated structure becomes difficult because the tool comes off.

  It is an object of the present invention to be able to be easily constructed without depending on the positional relationship of steel frames in buildings, the thickness of the steel frames, and the expansion of the thermally expandable fireproof sheet even when exposed to heat such as fire. An object of the present invention is to provide a steel-coated structure that can prevent the formation of a thin portion in the thickness of the residue.

  As a result of intensive studies by the inventor in order to solve the above-mentioned problems, an extension tool is installed on a flange of a steel frame, and the steel frame is covered with a thermally expandable refractory sheet over the extension tool. Is deformed when heated by a fire or the like, and the flange end portion of the steel frame is inserted into the installation groove of the expansion device while maintaining a deformation state of a part or all of the installation groove of the expansion device. As a result, the present invention has been completed.

That is, the present invention
[1] 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;
An extension device installed at both ends of at least one of the two flanges;
A thermally expandable refractory sheet covering the steel frame and the expansion tool;
A steel-coated structure having
The expansion tool has an installation groove into which the flange end can be inserted;
By inserting the flange end into the installation groove of the extension tool,
The expansion tool is installed at the flange end while maintaining a state where a part or all of the installation groove of the expansion tool is deformed,
And the extension tool is installed to protrude outside from the flange end,
Between the thermally expandable fireproof sheet and the end of the flange is provided a gap filled with an expansion residue of the thermally expandable fireproof sheet,
The expander is deformed when heated and is accompanied by a decrease in volume, and provides a steel-coated structure.

One of the present invention is
[2] By deforming a part or all of the installation groove of the extension tool, a stress is generated in which the deformed installation groove of the extension tool returns to the shape before the deformation, and the stress causes the installation of the extension tool . The steel frame covering structure according to the above [1], wherein the groove and the flange end are fixed.

One of the present invention is
[3] The steel covering structure according to [1] or [2], wherein the installation groove of the expansion tool is at least one selected from the group consisting of the following (1) to (5). It is.
(1) Installation groove provided with a protrusion on at least one of the inner surface (a) and the other inner surface (b) of the installation groove of the extension tool facing each other (2) The installation groove of the extension tool One of the installation grooves of the expansion tool facing each other, the installation groove (3) in which the opening of the installation groove narrows continuously or stepwise from the inner surface (c) toward the opening of the installation groove. The inner surface (a) and the other inner surface (b) of at least one of the inner surface (a) and the other inner surface (a) of the installation groove of the expansion tool, wherein the installation groove (4) has a bent portion. At least one surface of b) is an installation groove formed by combining installation grooves having corrugated portions (5) plate material, and at least one of the plate materials forming the installation groove is inclined and contacts the flange

One of the present invention is
[4] The expansion tool is a sphere with an installation groove, a cube with an installation groove, a rectangular parallelepiped with an installation groove, a cylinder with an installation groove, a polygonal column with an installation groove, and an ellipse with an installation groove. The steel covering structure according to any one of the above [1] to [3], which is at least one selected from the group consisting of a plate-like bent molded body having columns and installation grooves.

One of the present invention is
[5] The expansion tool is a sphere with an installation groove, a cube with an installation groove, a rectangular parallelepiped with an installation groove, a cylinder with an installation groove, a polygonal column with an installation groove, and an ellipse with an installation groove. What provides the steel coating structure in any one of said [1]-[4] which connects at least 2 or more chosen from the group which consists of a plate-shaped molded object provided with the pillar and the installation groove | channel with a connection member. It is.

One of the present invention is
[6] The expansion tool 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,
An installation groove for inserting the flange end portion of the steel frame is formed by a notch surrounded by the main body plate, the support portion of the side plate, and the flange holding portion of the side plate,
A notch is formed at a joint portion between the side plate support portion and the side plate flange holding portion so that the flange holding portion of the side plate is tiltably connected to the side plate support portion. The steel-coated structure according to any one of [1] to [5] is provided.

One of the present invention is
[7] The steel covering structure according to any one of [1] to [6], wherein the expansion tool is deformed by a temperature not higher than a thermal expansion start temperature of the thermally expandable refractory sheet.

One of the present invention is
[8] The steel covering structure according to any one of [1] to [7], wherein the expansion tool includes at least one selected from the group consisting of paper, wood, natural resin, and synthetic resin. Is.

One of the present invention is
[9] The steel frame is installed with the outer surface of one flange parallel to the section provided in the partition of the building,
The extension tool is installed at both ends of the other flange opposite to the one flange;
The thermally expandable fireproof sheet covers the steel frame and the expansion tool, and is fixed to at least one of the steel frame and the compartment.
The steel frame covering structure according to any one of the above [1] to [8] is provided.

The present invention also provides
[10] An expander having an installation groove for use in the steel-coated structure according to any one of [1] to [9],
The expansion tool is provided with an expansion tool in which the installation groove of the expansion tool is at least one selected from the group consisting of the following (1) to (5).
(1) An installation groove provided with a protrusion on at least one of the inner surface (a) and the other inner surface (b) of the installation groove of the extension tool, facing each other (2) The installation groove of the extension tool The installation groove (3) in which the opening of the installation groove narrows continuously or stepwise from the inner surface (c) of the installation groove toward the opening of the installation groove. One inner surface (a) and the other inner surface of the installation groove of the expansion tool, wherein at least one of the inner surface (a) and the other inner surface (b) is opposed to the installation groove (4) having a bent portion. (B) At least one surface is an installation groove formed by combining installation grooves having a corrugated portion (5) plate material, and at least one of the plate materials forming the installation groove is inclined and contacts the flange

One of the present invention is
[11] The expansion tool 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,
An installation groove for inserting the flange end portion of the steel frame is formed by a notch surrounded by the main body plate, the support portion of the side plate, and the flange holding portion of the side plate,
A notch for connecting the flange holding portion of the side plate to the support portion of the side plate so as to be inclined is formed in the connecting portion between the support portion of the side plate and the flange holding portion of the side plate. The expansion tool according to [10] above, which is a feature, is provided.

In the expansion tool used in the steel-coated structure according to the present invention, the flange end portion is inserted into the installation groove of the expansion tool when a part or all of the installation groove of the expansion tool is deformed.
Therefore, by adjusting the degree of deformation of a part or all of the installation groove of the extension tool, the extension tool can be easily installed on the steel frame even if the thickness of the flange of the steel frame is different.

Furthermore, in the expander used in the steel frame covering structure of the present invention, a stress is generated to return the deformed extension groove of the expander to a shape before the deformation by deforming a part or all of the expander installation groove. The installation groove of the extension portion and the flange end portion are fixed by this stress.
For this reason, it can prevent that the said extension tool installed in the said flange edge part falls off from the said flange edge part easily. For this reason, there is little work delay accompanying dropping of the expansion tool when constructing the steel cover structure of the present invention, and the steel cover structure of the present invention is excellent in workability.

Moreover, the steel frame covering structure of the present invention is provided with an extension tool protruding from the flange to the outside at the end of the flange of the steel frame.
Since the thermally expandable refractory sheet covers the steel frame via the expansion tool, a certain gap is provided between the thermally expandable refractory sheet and the end of the flange.
On the other hand, the expansion tool deforms when heated by heat such as a fire.
For this reason, when the steel-coated structure according to the present invention is exposed to heat such as a fire, the thermally expandable fireproof sheet expands and the expansion tool is deformed. Therefore, the thermally expandable fireproof sheet and the flange The expansion residue of the thermally expandable refractory sheet is filled in the gap with the end of the sheet.
As a result, the expansion residue of the heat-expandable fireproof sheet is relatively uniformly generated around the steel frame, and the portion where the expansion residue is extremely thin with respect to the steel frame is not generated. The time transmitted to the steel frame can be effectively delayed.
Thereby, the steel frame covering structure of the present invention is excellent in fire resistance.

  The steel frame covering structure of the present invention can be constructed by covering the steel frame and the expansion tool with a heat-expandable fireproof sheet, and a metal plate and a heat-expandable material layer are laminated and integrated like a conventional steel frame covering structure. There is no need to prepare a fireproof coating unit formed by bending and bending. For this reason, it can be easily constructed even in a building in which steel frames are complexly combined.

Furthermore, since the steel frame covering structure of the present invention can be constructed by installing an expansion tool on the steel frame and covering the steel frame and the expansion tool with a thermally expandable fireproof sheet, when constructing the steel frame covering structure of the present invention, Construction can also be performed by non-skilled workers.
Thereby, the steel frame covering structure of the present invention is excellent in construction workability.

FIG. 1 is a schematic cross-sectional view for describing an embodiment of a steel frame covering structure according to the present invention. FIG. 2 is a schematic partial cross-sectional view showing the steel frame and the expander shown in FIG. 1 in the steel cover structure of the present invention. FIG. 3 is a schematic cross-sectional view for explaining an embodiment of the steel-coated structure according to the present invention. FIG. 4 is a perspective view for explaining the shape of the expander used in the present invention. FIG. 5 is a perspective view for explaining the shape of the expander used in the present invention. FIG. 6 is a perspective view for explaining a modification of the expansion tool used in the present invention. FIG. 7 is a perspective view for explaining a modification of the expansion tool used in the present invention. FIG. 8 is a cross-sectional view for explaining a modification of the expander used in the present invention. FIG. 9 is a schematic perspective view showing a modified example of the protruding portion installed in the installation groove of the extension tool used in the present invention. FIG. 10 is a schematic perspective view showing a modified example of the protruding portion installed in the installation groove of the extension tool used in the present invention. FIG. 11 is a schematic perspective view showing a modified example of the protruding portion installed in the installation groove of the extension tool used in the present invention. FIG. 12 is a perspective view for explaining an embodiment of the expansion tool used in the present invention. FIG. 13 is a plan view for explaining an embodiment of the expansion tool used in the present invention. FIG. 14 is a perspective view for explaining an embodiment of the expansion tool used in the present invention. FIG. 15 is a plan view for explaining one embodiment of the expansion tool used in the present invention. FIG. 16 is a perspective view for explaining an embodiment of the expansion tool used in the present invention. FIG. 17 is a schematic perspective view for explaining a state in which the extension tool used in the present invention is installed on the steel frame. FIG. 18 is a schematic perspective view for explaining a state in which the extension tool used in the present invention is installed on the steel frame. FIG. 19 is a plan view for explaining a modification of the expander used in the present invention. FIG. 20 is a plan view for explaining an embodiment of the expansion tool used in the present invention. FIG. 21 is a perspective view for explaining an embodiment of the expansion tool used in the present invention. FIG. 22 is a plan view for explaining an embodiment of the expansion tool used in the present invention. FIG. 23 is a perspective view for explaining an embodiment of the expansion tool used in the present invention. FIG. 24 is a perspective view for explaining an embodiment of an expander used in addition to the present invention. FIG. 25 is a perspective view for explaining an embodiment of an expander used in addition to the present invention. FIG. 26 is a schematic cross-sectional view for explaining the steel frame covering structure according to the first embodiment of the present invention. FIG. 27 is a schematic cross-sectional view for explaining the steel frame covering structure of Comparative Example 1. FIG. 28 is a schematic cross-sectional view for explaining the steel frame covering structure of Comparative Example 3. FIG. 29 is a schematic perspective view for explaining an extension tool used in a conventional steel frame covering structure. FIG. 30 is a schematic cross-sectional view for explaining a conventional steel-coated structure.

Hereinafter, embodiments of the steel frame covering structure of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view for explaining an embodiment of a steel-coated structure according to the present invention.
The steel frame 1 illustrated in FIG. 1 has a structure with an H-shaped cross section, and 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 1 is publicly known, and a commercially available product can be appropriately selected and used.

Here, the steel frame 1 has a function as a beam for supporting a structural member 5 such as a floor or a ceiling of a building, and is fixed to the structural member 5 directly or via a metal connecting member or the like by fixing means such as bolts or welding. (Not shown).
In addition, although FIG. 1 demonstrates the case where the said steel frame 1 was installed in the horizontal direction as a beam, when the said steel frame 1 is installed in the vertical direction as a column, the steel frame covering structure of this invention can be formed similarly. Is possible.

Extenders 6 and 6 are installed at both ends of the lower flange 3. Each of the expansion tools 6 and 6 has an installation groove having an opening that is narrower than the thickness of the end of the lower flange 3, and the lower flange 3 is inserted by expanding the installation groove. The expansion tools 6 and 6 can be installed at the both ends of 3.
The expansion tools 6 and 6 are installed so as to protrude outward from both ends of the lower flange 3 in the vertical and horizontal directions with respect to the web 4.
Here, projecting outward from the lower flange 3 means having an extended portion on the outside of the steel frame 1 with reference to both ends of the lower flange 3.

FIG. 2 is a schematic partial cross-sectional view showing the steel frame and the expander shown in FIG. 1 in the steel cover structure of the present invention.
Among the ranges of the steel frame 1, among the ranges divided by the dashed lines aa and bb, the ranges indicated by reference signs A to H indicate the outside of the steel frame 1.
As shown in FIG. 2, the expansion tools 6 and 6 have expansion portions at reference numerals A, B and C and reference numerals C, D and E, respectively.
In the case of FIG. 2, the expansion tool used in the present invention has an expansion portion in at least one of the reference signs A, B and C, and the reference signs C, D and E Of these, at least one range has an extended portion.
The expansion tool used in the present invention is preferably one having expansion portions at reference numerals A and E.

Returning again to FIG.
The steel frame 1 and the expansion tools 6 and 6 are covered with a heat-expandable fireproof sheet 7.
The heat-expandable fireproof sheet 7 can be fixed to the steel frame 1 by fixing means such as screws, tuckers, welding pins, bolts, tapping screws or the like.
In the case of FIG. 1, the heat-expandable fireproof sheet 7 is fixed to the steel frame 1 by welding pins 8.

If necessary, the end surface of the thermally expandable fireproof sheet 7 is fixed to a structural member 5 such as a floor or a ceiling by a fixing means such as a bolt, a screw, a tucker, or a tapping screw to obtain the steel-coated structure of the present invention.
When fixing the thermally expandable fireproof sheet 7 to the structural material 5, for example, a protrusion such as an embedding pin is installed in the structural material 5 in advance, and the thermally expandable fireproof sheet is pushed from the outside. It is also possible to fix the thermally expandable refractory sheet 7 to the structural member 5 by fixing means such as passing the protrusion through 7 and bending the penetrating portion of the protrusion.

FIG. 3 is a schematic cross-sectional view for explaining an embodiment of the steel-coated structure according to the present invention.
FIG. 1 is a cross-sectional view showing a cross section of the steel frame 1, but FIG. 3 is a web 4 of the steel frame 1 (the web 4 is not shown in FIG. 3 because it is covered with a thermally expandable fireproof sheet 7). It is sectional drawing which shows the cross section cut | disconnected by the surface parallel to.
In FIG. 3, the heat-expandable fireproof sheet 7 is fixed to the steel frame 1 by a welding pin 8 every 250 mm.
Moreover, when using two or more of the said heat | fever expansible fireproof sheets 7, it is preferable to overlap and fix the boundary part of the said heat expansible fireproof sheets 7 and 7, as shown in FIG.
In the case of FIG. 3, the said heat-expandable fireproof sheets 7 and 7 are piled up to a width of 100 mm.
As shown in FIG. 3, in order to eliminate the influence of heat or the like on the steel frame 1, the steel frame structure of the present invention is such that the steel frame 1 and the extension tool 6 are covered without gaps by the thermally expandable fireproof sheet 7. Preferably it is.

As the expansion tool 6 used in the present invention, one that deforms when heated by a fire or the like is used.
The deformation of the expander 6 is preferably accompanied by a decrease in volume, and more preferably, the deformation of 6 or a deformation accompanied by a decrease in volume starts at a temperature before and after the thermally expandable refractory sheet 7 starts to expand. It is further preferable that deformation of the expansion tool 6 or deformation accompanied by a decrease in volume starts at a temperature lower than the thermal expansion start temperature of the thermally expandable fireproof sheet 7.
By using an expander that deforms at a temperature lower than the thermal expansion start temperature of the thermally expandable fireproof sheet 7, the expander holds the thermally expandable fireproof sheet before the thermally expandable fireproof sheet expands. In addition, the position of the thermally expandable fireproof sheet can be prevented from changing.

  Normally, the heat-expandable fireproof sheet 7 used in the present invention starts expanding in a temperature range of 80 to 300 ° C., but the expansion tool 6 used in the present invention is adapted to the expansion start temperature of the heat-expandable fireproof sheet, It is preferable to select one that deforms in a temperature range that does not hinder its thermal expansion.

When the steel frame covering structure shown in FIG. 1 is exposed to heat such as a fire, the thermally expandable fireproof sheet 7 covering the steel frame 1 and the expansion devices 6 and 6 expands and the expansion devices 6 and 6 are used. Deformation is started at a temperature around the thermal expansion start temperature of the thermally expandable refractory sheet.
The expansion tools 6 and 6 are preferably those 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 of 7.
Even if the expanders 6 and 6 are deformed by heat of fire or the like and the expanders 6 and 6 are damaged, the thermally expandable fireproof sheet 7 expands and expands by the thermally expandable fireproof sheet 7. Residue is disposed in the gap between the lower web 3 of the steel frame 1 and the thermally expandable fireproof sheet 7 including the space where the expansion tools 6 and 6 existed.
Thereby, the periphery of the steel frame 1 is surrounded relatively uniformly by the expansion residue of the thermally expandable refractory sheet as compared with the case where the expanders 6 and 6 are not used.
Since there is no portion where the expansion residue is extremely thin around the steel frame 1, the steel frame 1 can be effectively protected from heat such as fire.

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 of 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, a heat-expandable resin layer, an inorganic fiber layer, and the like. In addition to melt coextrusion, hot pressing, etc., these layers may include means for attaching each layer with an adhesive. The thermally expandable refractory sheet used in the present invention preferably has a metal foil layer on the outermost surface.

Commercially available products can be used as the heat-expandable fireproof sheet, for example, Fibro (manufactured by Sekisui Chemical Co., Ltd .; trade name: epoxy resin or rubber as a resin component, phosphorus compound, heat-expandable graphite, inorganic filler, etc. It is possible to obtain and use a sheet-like molded product of a thermally expandable resin composition.
The thermally expandable graphite is preferably a neutralized thermally 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.

  Moreover, in this invention, after covering the said steel frame and an expansion tool with a steel frame covering material, it can be covered with a thermally expansible fireproof sheet, and it covers with a steel frame covering material from above the said heat expansible fireproof sheet 7. You can also.

Examples of the steel coating material include inorganic fiber sheets made of inorganic fibers such as rock wool, glass wool, and ceramic wool,
Aluminum foil, iron foil, stainless steel foil, tin foil, lead foil, tin-lead alloy foil, copper foil, clad foil, lead anti-foil and other metals, aluminum thin plate, copper thin plate, stainless steel thin plate, tin thin plate, lead thin plate, tin lead Examples thereof include metal sheets such as alloy thin plates, clad thin plates, lead anti-thin plates, etc., aluminum glass cloths, and synthetic resins in which metal powders such as aluminum and magnesium are dispersed.
These inorganic fiber sheets and metal sheets can be used singly or in combination, or can be used by being laminated.

Next, the detail of the expansion tool used for this invention is demonstrated.
4 and 5 are perspective views for explaining the shape of the expansion tool used in the present invention.
As illustrated in FIG. 4 and FIG. 5, examples of the shape of the expander used in the present invention include shapes such as a sphere, a cube, a rectangular parallelepiped, a cylinder, a quadrangular column, and a polygonal column.
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 dilator illustrated in FIGS. 4 and 5 includes an installation groove 10. The installation groove 10 is provided for installing the extension tool at the flange end of the steel frame.
4 and 5, the size of the opening of the installation groove is narrower than the thickness of the steel flange. For this reason, the edge part of the flange of the steel frame used for this invention can be inserted in the installation groove | channel of an expansion tool by changing a part or all of the installation groove | channel of an expansion tool.

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 deforming a part or all of the installation groove of the extension tool, the opening of the installation groove may be widened.
By deforming the installation groove 10 of the sphere expansion device, a stress is generated to return the deformed expansion device installation groove 10 to its original shape. Due to this stress, the installation groove 10 of the extension portion and the flange end portion can be fixed.
The point which can fix the installation groove | channel 10 of the said expansion part and the said flange edge part with the said stress is the same also in the case of the following expansion tools.

6, 7, and 9 to 11 are perspective views illustrating modifications of the expander described in FIGS. 4 and 5. FIG. 8 is a cross-sectional view illustrating a modified example of the expander described in FIGS. 4 and 5.
In addition to the installation groove 10, the sphere expander illustrated in FIG.
The installation groove 10 illustrated in FIG. 6 (a) is formed by one inner surface 30, the other inner surface 31, and the inner surface 32 at the back of the installation groove 10 of the expansion tool. In addition, one inner surface 30 and the other inner surface 31 of the installation groove 10 of the expansion tool are in a relationship of facing each other.
A protrusion 40 is provided on the inner surface 30 of the installation groove 10 of the sphere expander. The protrusion 40 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 31 of the installation groove 10 of the spherical expander and the tip of the projection 40 is smaller than the thickness of the flange end of the steel frame used in the present invention.
For this reason, when the installation groove 10 of the ball extension tool is installed at the end of the flange of the steel frame used in the present invention, the installation groove 10 of the ball extension tool is expanded and then the installation of the ball extension tool is performed. The end of the steel flange is inserted into the groove 10.
The installation groove 10 of the extension portion and the flange end portion are caused by the stress caused by the deformation of the installation groove 10 of the cubic extension device so that the deformed installation groove 10 of the extension device returns to the shape before the deformation. Can be fixed.

The cubic extension tool illustrated in FIG. 6B ′ includes a protrusion 41 in addition to the installation groove 10.
The installation groove 10 illustrated in FIG. 6 (b ′) is formed by one inner surface 30 and the other inner surface 31 and the inner surface 32 at the back of the installation groove of the expander as in the case of FIG. 6 (a ′). ing.
Protrusions 41 and 41 are provided on the inner surfaces 30 and 31 of the installation groove 10 of the cubic extension tool, respectively. The shape of the protrusions 41 is a rectangular parallelepiped.

The distance between the protrusion 41 installed on the inner surface 30 of the installation groove 10 of the cubic extension tool and the projection 41 installed on the inner surface 31 of the installation groove 10 of the cube extension tool is the present invention. It is smaller than the thickness of the flange end of the steel frame used.
Therefore, when the installation groove 10 of the cubic extension tool is installed at the end of the flange of the steel frame used in the present invention, the installation groove 10 of the cube extension tool is expanded and then the installation of the cubic extension tool is performed. The end of the steel flange is inserted into the groove 10.
Due to the stress caused by the deformation of the installation groove 10 of the cubic expansion device for the deformation of the installation groove 10 of the deformed expansion device to return to the shape before the deformation, the expansion is performed in the same manner as in the case of the previous ball expansion device. The installation groove 10 of the part and the flange end can be fixed.

The rectangular parallelepiped expander illustrated in FIG. 6C ′ includes an installation groove 10.
The rectangular parallelepiped extension tool illustrated in FIG. 6C ′ is installed on the inner surface 30 of the cubic extension tool installation groove 10 as in the case of the cubic extension tool illustrated in FIG. 6B ′. And the protrusion 41 installed on the inner surface 31 of the installation groove 10 of the cubic extension tool.
In the case of the cubic extension tool illustrated in FIG. 6B ′, the protrusions 41 are arranged symmetrically inside the installation groove 10, but are illustrated in FIG. 6C ′. In the case of a rectangular parallelepiped expansion tool, the protrusions 41 are different from each other in that they are alternately arranged on the inner surface 30 and the inner surface 31 of the installation groove 10.

In addition to the installation groove 10, the columnar dilator illustrated in FIGS. 7 (d ′) to (f ′) includes a protrusion 42.
Protrusions 42 are also installed inside the installation groove 10 of the columnar extension tool. Although the distance between the protrusions 42 and 42 is smaller than the thickness of the steel frame, the end of the flange of the steel frame is inserted into the installation groove 10 of the front columnar extension tool by widening the installation groove 10 of the columnar extension tool. be able to.

FIG. 8 is a schematic cross-sectional view showing a modified example of the protruding portion installed in the installation groove of the extension tool used in the present invention.
As illustrated in FIGS. 8D and 8E, the protrusion 42 is installed on at least one of the inner surface 30 and the inner surface 31 among the inner surface 30, the inner surface 31, and the inner surface 32 of the back of the installation groove 10 of the expander. can do.

Further, as illustrated in FIGS. 8 (f) and 8 (g), the opening of the installation groove 10 is directed from the inner surface 32 at the back of the installation groove 10 of the extension tool toward the opening of the installation groove 10. By narrowing, it is possible to give the inner surface 30 and the inner surface 31 of the installation groove 10 of the expander the same function as the protrusion 42 illustrated in FIGS. 8D and 8E.
The protrusions 42 illustrated in FIGS. 8D and 8E bulge in a stepwise direction toward the opening of the installation groove 10, whereas the protrusions 42 illustrated in FIGS. 6F and 6G are illustrated. The protrusion 43 continuously protrudes toward the opening of the installation groove 10.

  Further, as illustrated in FIGS. 8 (h) and (i), a planar portion is provided on at least one of the inner surface 30 and the inner surface 31 of the extension tool installation groove 10 as a protrusion to be installed in the extension tool installation groove. It is also possible to provide a protrusion 44 having a protrusion and a protrusion 45 having a curved portion.

FIGS. 9-11 is a schematic perspective view which shows the modification of the projection part installed in the installation groove | channel of the expansion tool used for this invention.
In the case of the columnar extension tool of FIG. 7 described above, the protrusion 42 is installed along the longitudinal direction of the columnar extension tool. However, in the case of the columnar extension tool illustrated in FIG. The difference is that the portions 46 are installed in a direction perpendicular to the longitudinal direction of the columnar dilator at an interval.
In the case of the columnar extension tool illustrated in FIG. 9, the projection 46 is provided on the inner surface 30 of the installation groove 10. However, the projection 46 may be installed on the inner surface 31 of the installation groove 10. it can.

As illustrated in FIG. 10, the expander used in the present invention has a bent portion on at least one of the inner surface 30 and the other inner surface 31 of the expander installation groove 10 facing each other. Can be installed.
The bent portion is formed in a shape in which a valley portion 47 and a mountain portion 48 are repeated. In addition, the shape including a plane may be sufficient as the said bending part.

Further, as illustrated in FIG. 11, the expander used in the present invention has a corrugated portion on at least one surface of one inner surface 30 and the other inner surface 31 of the expander installation groove 10 facing each other. Can be installed.
The corrugated portion may have a shape including a plane.

  By expanding the installation groove 10 of the extension tool illustrated in FIGS. 4 to 11, the end of the steel flange can be inserted into the installation groove 10 of the extension tool 10.

  As illustrated in FIG. 12, the expander used in the present invention includes a flange joint portion 20, 20 for inserting a flange end portion of a steel frame, and a connecting member for connecting the flange joint portions 20, 20 to each other. 21 may be included.

FIG. 13 and FIG. 15 are plan views for explaining an embodiment of the extension tool used in the present invention, and FIGS. 14 and 16 are perspective views for explaining the embodiment of the extension tool used in the present invention. FIG.
As illustrated in FIGS. 13 and 14, the expansion tool 600 includes a main body plate 610 and two opposing side surface plates 620 and 630 installed at both ends of the main body plate 610.
The side surfaces 620 and 630 are connected to the main body plate 610 so as to be bendable.
The side surfaces 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.

An extension tool 601 shown in FIGS. 15 and 16 is a modification of the extension tool 600 shown in FIGS. 13 and 14.
In the extension tool 601, the end portions of the side plates 621 and 631 are rounded to enhance the installation work on the steel frame.

FIG. 17 and FIG. 18 are schematic perspective views for explaining a state in which the expansion tool used in the present invention is installed on the steel frame.
As illustrated in FIG. 17, the expansion tool 600 has an installation groove that is narrower than the outer shape of the end of the flange 3 of the steel frame 1. The expansion tool 600 can be installed on the steel frame 1 by deforming the flange holding portions 660 and 670 and inserting the installation groove into the end of the flange 3 of the steel frame 1.

  Further, as illustrated in FIG. 18, 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 tiltable, and thus 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 extension tool 600 is attached to the steel frame 1 even when the width of the installation groove is narrower than the thickness of the end of the flange 3 of the steel frame 1. 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 extension tool 600 is installed at the end of the flange 3 of the steel frame 1 even when the width of the installation groove is narrower than the thickness of the end of the flange 3 of the steel frame 1. can do.

FIG. 19 is a plan view for explaining a modification of the expander used in the present invention.
An extension tool 604 illustrated in FIG. 19 illustrates a modification of the extension tool 600.
The expansion tool 604 includes a main body plate 614 and two opposing side surface 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 portion is inserted into the extension tool 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 expansion tool 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.

An extension tool 602 shown in FIGS. 20 and 21 is a modification of the extension tool 600 shown in FIGS. 13 and 14.
As illustrated in FIGS. 20 and 20, the expansion tool 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. 21, the installation groove formed by the notch 692 is formed by the inner surface 30, the inner surface 31, and the inner surface 32 at the back. The inner surface 31 of the installation groove is formed by the body plate 612, and the inner surface 31 of the installation groove and the inner surface 32 of the back are formed by the end surfaces of the side plates 632, respectively.
The opening of the installation groove is narrowed from the inner surface 32 at the back of the installation groove of the extension tool toward the opening of the installation groove.
When the flange end of the steel frame is inserted into the extension tool 602, the main body plate 612 and the side plates 622, 632 are deformed.
The expansion tool 602 can be fixed to the flange end portion 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.

An extension tool 603 shown in FIGS. 22 and 23 is a modification of the extension tool 602 shown in FIGS. 20 and 21.
The extension tool 603 is provided with a protrusion on the inner surface 30 of the 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 flange end of the steel frame can be inserted into the installation groove of the extension tool 603.

The steel frame covering structure of the present invention can be used in combination with an extension tool that can be installed at the flange end of the steel frame without deforming the installation groove of the extension tool as required.
As a specific example of such an extension tool, for example, an extension tool provided with an installation groove exemplified in FIG.
The installation groove having the installation groove 10a illustrated in FIG. 24 may include a step 10a.
When the step 10a is installed on the steel frame 1, it can be installed by sticking the step 10a to both ends of the flange 3 of the steel frame 1 with a heat-resistant adhesive tape or the like.

  The expansion tool illustrated in FIG. 25 is provided with steps 10b and 10c at both ends, and these are installed on the steel frame 1 by installing them at the end of the upper flange 2 and the end of the lower flange 3, respectively. You can also.

Next, the material of the expansion tool used in the present invention will be described.
The expansion tool used in the present invention is deformed when heated by heat such as a fire as described above.

  Examples of the material for the expansion tool include one or two or more of paper, wood, natural resin, synthetic resin, 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 wood are not limited to wood materials obtained from natural wood, but include laminated wood containing wood materials, laminated wood, laminated wood board, and the like.

  Examples of the natural resins include cellulose derivatives, gelatin, alginates, chitosan, pullulan, pectin, carrageenan, proteins, tannins, lignins, rosin acids 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.

  The material of the expansion tool is preferably selected as appropriate as long as the expansion of the thermally expandable refractory sheet used in the present invention is not hindered when the steel coating structure of the present invention is exposed to heat such as fire.

  EXAMPLES Next, although this invention is demonstrated in detail based on drawing based on an Example, this invention is not limited at all by these Examples.

FIG. 26 is a schematic cross-sectional view for explaining the steel frame covering structure according to the first embodiment of the present invention.
In Example 1, a calcium silicate plate is used as the structural material 5. Further, the steel frame 1 is fixed to the structural member 5 by embedded bolts (not shown).
The expansion tool 600 used in Example 1 has the same shape as the expansion tool shown in FIG. 14, and is made of polypropylene.
The expansion tool 600 is preferably installed at an interval of 200 to 800 mm with respect to the flange 3, and more preferably at an interval of 400 to 600 mm.
A heat-expandable fireproof sheet 7 is installed so as to cover the steel frame 1 and the expansion tool 600, and is welded to the steel frame 1 by a welding pin 8 having a length of 15 mm.

The heat-expandable fireproof sheet 7 used in Example 1 is obtained by laminating both faces of a heat-expandable fireproof material having a thickness of 0.7 mm with an aluminum foil laminated glass cloth. The aluminum foil of the aluminum foil laminated glass cloth is The heat-expandable fireproof sheet 7 is disposed on the outermost surface.
The thermally expandable refractory sheet 7 has an end portion of 20 mm in contact with the structural material 5.
The expansion tool 600 is installed so as to protrude 50 mm outward from both ends of the flange 3 of the steel frame 1 so that the thermally expandable fireproof sheet 7 does not directly contact the flange 3 of the steel frame 1.
Further, the method of covering the thermally expandable fireproof sheet 7 with respect to the steel frame 1 and the expansion tool 600 is the same as in the case of FIG. 2 described above, and welding pins 8 are welded to the flange 2 of the steel frame 1 at intervals of 250 mm. Yes.

Moreover, in the boundary part with the heat-expandable fireproof sheets 7, 7, the heat-expandable fireproof sheets 7, 7 are overlapped and fixed with a width of 100 mm.
The steel covered structure shown in Example 1 was subjected to a fire resistance performance test for 1 hour in accordance with the test method of ISO 834, and the maximum surface temperature of the steel beam having the H-shaped cross section was measured. As a result, the maximum surface temperature of the H-shaped steel frame 1 was 546 ° C. at maximum and 529 ° C. on average.

In addition, the expansion | swelling residue of the thermally expansible fireproof sheet after a fireproof performance test expanded in the range of 55-60 mm in the orthogonal | vertical direction to a web.
Further, at both ends of the flange 3 of the steel frame 1, an expansion residue of 25 mm was formed in the horizontal direction from both ends of the flange 3.
Further, an expansion residue of about 65 mm was formed on the lower surface of the flange 3 in a vertically downward direction with respect to the flange 3.
The entire steel frame 1 was covered with the expansion residue, and the portion where the steel frame 1 was exposed to the outside and the location where the expansion residue became extremely thin could not be observed.

In the case of the first embodiment, instead of the polypropylene expansion tool 600, an expansion tool made of styrene foam having the shape shown in FIG. 4B protrudes from the both ends of the flange 3 of the steel frame 1 by 50 mm to the outside. In the same manner as in Example 1, a fire resistance performance test for 1 hour was conducted in accordance with the test method of ISO 834.
The maximum surface temperature of the H-shaped steel frame 1 was 540 ° C. at maximum and 526 ° C. on average.
The entire steel frame 1 was covered with the expansion residue, and the portion where the steel frame 1 was exposed to the outside and the location where the expansion residue became extremely thin could not be observed.

In the case of Example 2, it replaced with the thermally expansible fireproof sheet 7, and used what laminated | stacked both surfaces of the 0.5 mm-thick thermally expansible refractory material with the aluminum foil laminated glass cloth of Example 1. In exactly the same manner as in the case, a fire resistance test for 1 hour was conducted in accordance with the test method of ISO 834.
The maximum surface temperature of the steel frame 1 having the H-shaped cross section was 613 ° C. at the maximum and 594 ° C. on the average.
The entire steel frame 1 was covered with the expansion residue, and the portion where the steel frame 1 was exposed to the outside and the location where the expansion residue became extremely thin could not be observed.

[Comparative Example 1]
FIG. 27 is a schematic cross-sectional view for explaining the steel frame covering structure of Comparative Example 1.
In the case of Example 1, the expansion tool was not used, and by providing a slack portion (gap of 40 mm at the center) of the thermally expandable fireproof sheet 7 on the lower surface of the flange 3 of the steel frame 1, the thermally expandable fireproof A fire resistance test was performed in exactly the same manner as in Example 1 except that the sheet 7 was not in direct contact with the lower surface of the flange 3 of the steel frame 1.
As a result, since the maximum surface temperature of the steel frame 1 having the H-shaped cross section reached 623 ° C. within 55 minutes after the start of the test, the fire resistance test was stopped. The maximum surface temperature of the steel frame 1 having the H-shaped cross section was 482 ° C. on average.
Further, it was observed that almost no expansion residue was formed at both ends of the flange 3 of the steel frame 1 from both ends of the flange 3 in the horizontal direction.

[Comparative Example 2]
In the case of the comparative example 1, it replaced with the thermally expansible fireproof sheet 7, and used what laminated | stacked both surfaces of the 0.5 mm-thick thermally expansible refractory material with the aluminum foil laminated glass cloth of Comparative example 1. In exactly the same manner as in the case, a fire resistance test for 1 hour was conducted in accordance with the test method of ISO 834.
As a result, since the maximum surface temperature of the steel frame 1 having the H-shaped cross section reached 635 ° C. after 54 minutes from the start of the test, the fire resistance test was stopped. The maximum surface temperature of the H-shaped steel frame 1 was 615 ° C. on average.
Further, it was observed that almost no expansion residue was formed at both ends of the flange 3 of the steel frame 1 from both ends of the flange 3 in the horizontal direction.

[Comparative Example 3]
FIG. 28 is a schematic cross-sectional view for explaining the steel frame covering structure of Comparative Example 3.
In the case of Comparative Example 2, a fire resistance performance test for 1 hour was performed in accordance with the test method of ISO 834 in exactly the same manner as in Comparative Example 2 except that the sagging portion of the thermally expandable fireproof sheet 7 was not provided. .
As a result, since the maximum surface temperature of the steel frame 1 having the H-shaped cross section reached 643 ° C. within 52 minutes after the start of the test, the fire resistance test was stopped. The maximum surface temperature of the H-shaped steel frame 1 was 586 ° C. on average. Further, it was observed that almost no expansion residue was formed at both ends of the flange 3 of the steel frame 1 from both ends of the flange 3 in the horizontal direction.

  This specification is based on Japanese Patent Application No. 2010-196263 of an application on September 1, 2010. All this content is included here.

  Since this invention can give fire resistance easily with respect to the building which uses the steel frame, it can apply to the fireproof structure of a building use widely.

DESCRIPTION OF SYMBOLS 1 Steel frame 2, 3 Flange 4 Web 5 Structural material 6, 200, 600-604 Expansion tool 7 Thermal expansion fireproof sheet 8 Welding pin 10 Installation groove 10a, 10b, 10c Level difference 20 Flange joint part 21 Connecting member 30, 31 Inner surface 32 Back inner surface 40-46 Protrusion 47 Valley 48 Mountain 49 Corrugated part 100 H-shaped steel 202 Horizontal part 204 L-shaped piece 206 Vertical piece 210 Insertion part 300 Non-combustible material 310 Gypsum board 320 Fireproof covering unit 500 Floor slab 610, 611 612, 613, 614 Main plate 620, 621, 622, 623, 624, 630, 631, 632, 633, 634 Side plate 640, 641, 642, 643, 644, 650, 651, 652, 653, 654 Support unit 660 , 661, 662, 663, 664, 670, 671, 6 2,673,674 flange holding section 680,681,682,683,684,690,691,692,693,694 notch 700,701,704,710,711,714 cuts reference numerals A~H steel external

Claims (11)

A steel frame having an H-shaped cross section composed of two flanges facing each other in parallel and one web connecting the flanges at both ends;
An extension device installed at both ends of at least one of the two flanges;
A thermally expandable refractory sheet covering the steel frame and the expansion tool;
A steel-coated structure having
The expansion tool has an installation groove into which the flange end can be inserted;
By inserting the flange end into the installation groove of the extension tool,
The expansion tool is installed at the flange end while maintaining a state where a part or all of the installation groove of the expansion tool is deformed,
And the extension tool is installed to protrude outside from the flange end,
Between the thermally expandable fireproof sheet and the end of the flange is provided a gap filled with an expansion residue of the thermally expandable fireproof sheet,
The steel covering structure, wherein the dilator is deformed and accompanied by a decrease in volume when heated. By deforming part or all of the installation groove of the extension tool, a stress is generated in which the installation groove of the deformed extension tool returns to the shape before the deformation, and this stress causes the installation groove of the extension tool and the The steel-coated structure according to claim 1, wherein the flange end portion is fixed. The steel frame covering structure according to claim 1 or 2, wherein the installation groove of the extension tool is at least one selected from the group consisting of the following (1) to (5).
(1) Installation groove provided with a protrusion on at least one of the inner surface (a) and the other inner surface (b) of the installation groove of the extension tool facing each other (2) The installation groove of the extension tool One of the installation grooves of the expansion tool facing each other, the installation groove (3) in which the opening of the installation groove narrows continuously or stepwise from the inner surface (c) toward the opening of the installation groove. The inner surface (a) and the other inner surface (b) of at least one of the inner surface (a) and the other inner surface (a) of the installation groove of the expansion tool, wherein the installation groove (4) has a bent portion. At least one surface of b) is an installation groove formed by combining installation grooves having corrugated portions (5) plate material, and at least one of the plate materials forming the installation groove is inclined and contacts the flange The extension tool is a sphere with an installation groove, a cube with an installation groove, a rectangular parallelepiped with an installation groove, a cylinder with an installation groove, a polygonal column with an installation groove, an elliptical column with an installation groove, and an installation. The steel-coated structure according to any one of claims 1 to 3, wherein the steel-coated structure is at least one selected from the group consisting of plate-like bent molded bodies having grooves.   The extension tool is a sphere with an installation groove, a cube with an installation groove, a rectangular parallelepiped with an installation groove, a cylinder with an installation groove, a polygonal column with an installation groove, an elliptical column with an installation groove, and an installation. The steel-coated structure according to any one of claims 1 to 4, wherein at least two or more selected from the group consisting of plate-like molded bodies provided with grooves are connected by a connecting member. The expansion tool has a main body plate and two opposing side plates installed at both ends of the main body plate,
The side plate has a support part and a flange holding part,
An installation groove for inserting the flange end portion of the steel frame is formed by a notch surrounded by the main body plate, the support portion of the side plate, and the flange holding portion of the side plate,
A notch is formed at a joint portion 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 support portion of the side plate. The steel frame covering structure in any one of claim | item 1 -5.   The steel covering structure according to any one of claims 1 to 6, wherein the expansion tool is deformed by a temperature not higher than a thermal expansion start temperature of the thermally expandable fireproof sheet.   The steel covering structure according to any one of claims 1 to 7, wherein the expansion tool includes at least one selected from the group consisting of paper, wood, natural resin, and synthetic resin. The steel frame is installed with the outer surface of one flange parallel to the compartment provided in the partition of the building,
The extension tool is installed at both ends of the other flange opposite to the one flange;
The steel covering structure according to any one of claims 1 to 8, wherein the thermally expandable fireproof sheet covers the steel frame and the expansion tool and is fixed to at least one of the steel frame and the section. An expansion tool having an installation groove for use in the steel-coated structure according to any one of claims 1 to 9,
The expansion tool is provided with an expansion tool in which the installation groove of the expansion tool is at least one selected from the group consisting of the following (1) to (5).
(1) An installation groove provided with a protrusion on at least one of the inner surface (a) and the other inner surface (b) of the installation groove of the extension tool, facing each other (2) The installation groove of the extension tool The installation groove (3) in which the opening of the installation groove narrows continuously or stepwise from the inner surface (c) of the installation groove toward the opening of the installation groove. One inner surface (a) and the other inner surface of the installation groove of the expansion tool, wherein at least one of the inner surface (a) and the other inner surface (b) is opposed to the installation groove (4) having a bent portion. (B) At least one surface is an installation groove formed by combining installation grooves having a corrugated portion (5) plate material, and at least one of the plate materials forming the installation groove is inclined and contacts the flange The expansion tool has a main body plate and two side plates facing each other installed at both ends of the main body plate,
The side plate has a support part and a flange holding part,
An installation groove for inserting the flange end portion of the steel frame is formed by a notch surrounded by the main body plate, the support portion of the side plate, and the flange holding portion of the side plate,
A notch for connecting the flange holding portion of the side plate to the support portion of the side plate so as to be inclined is formed in the connecting portion between the support portion of the side plate and the flange holding portion of the side plate. 11. A dilator according to claim 10, characterized in that