JP2012041749A - Fire resistant structure for steel frame member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire resistant structure for a steel frame member capable of reducing heat quantity transferring through a joint between neighboring board members.SOLUTION: A plurality of underlayer board members 160 are arranged on a circumference of a steel frame column 110. A plurality of top layer board members 170 are placed over outer surfaces of the underlayer board members 160. The underlayer board members 160 and the top layer board members 170 are supported by corner studs 120C and intermediary studs 120M. Sheet members 190 are placed between the underlayer board members 160 and the top layer board members 170. The sheet members 190 are placed astride edge portions 170T and 170U of the neighboring top board members 170 in a vertical direction so as to cover horizontal joints 172 formed between the edge portions 170T and 170U.

Description

  The present invention relates to a fireproof structure for a steel member.

  For example, Patent Document 1 is known as a fireproof covering structure for covering a steel column with a fireproof board. In Patent Document 1, a steel column is covered with two fireproof boards that are stacked. By the way, the joints (horizontal joints, vertical joints) of the adjacent fireproof boards tend to be a path through which heat from a fire or heat from a fire enters. As a countermeasure, Patent Document 2 discloses a wall in which a T-shaped metal plate (laying plate) is arranged at the joint between adjacent wall panels in the partition wall, and the wall panel is attached to the steel frame via the metal plate. Fireproof joint structures have been proposed. However, in this wall refractory joint structure, the heat entering from the joint of the adjacent wall panel is reduced by the metal plate, but the heat of the wall panel is transferred to the steel frame via the metal plate arranged in the joint. End up. That is, since the metal plate becomes a so-called heat bridge that transfers heat generated by the fire to the steel frame, the fire resistance is lowered.

Japanese Patent Laid-Open No. 11-1976

  In view of the above facts, the present invention aims to reduce the amount of heat entering from the joint between adjacent board members.

  The fire-resistant structure of a steel member according to claim 1 includes a plurality of first board members surrounding the steel member with a space from the steel member, and the steel frame between the steel member and the first board member. And a support member that supports the first board member and a sheet member that closes a first joint formed between the first board members.

  According to the first aspect of the present invention, since the first joint formed between the first board members is closed by the sheet member, the amount of heat entering from the first joint is reduced. Therefore, the fire resistance performance of the steel member is improved. Further, since the first board member is supported by the support member, it is not necessary to attach the first board member to the steel member via the sheet member, and the sheet member can be provided at a position away from the steel member. Therefore, the heat of the first board member is not directly transmitted to the steel frame member via the sheet member, so that a reduction in fire resistance is suppressed.

  The fireproof structure for a steel member according to claim 2, wherein the steel member is surrounded between the steel member and the first board member by surrounding the steel member with a space from the steel member, and between the steel member and the first board member. The member is disposed between the first board member, the support member that supports the first board member, and the plurality of second board members that are stacked on the outer surface of the first board member. And a seat member that closes at least one of the second joints formed between the second board members.

  According to the invention of claim 2, at least one of the first joint formed between the adjacent first board members and the second joint formed between the adjacent second board members is blocked by the sheet member. Therefore, the amount of heat entering from at least one of the first joint and the second joint is reduced. Therefore, the fire resistance performance of the steel member is improved. Further, since the first board member and the second board member are supported by the support member, it is not necessary to attach the first board member to the steel member via the sheet member, and the sheet member is provided at a position away from the steel member. be able to. Therefore, since fire heat etc. are not transmitted to a steel frame member via a sheet member, a fall of fireproof performance is controlled.

  The fire-resistant structure of the steel member according to claim 3 is the fire-resistant structure of the steel member according to claim 2, wherein the steel member is a steel column arranged with the vertical direction as the axial direction.

  According to the invention of claim 3, the steel column is surrounded by the first board member and the second board member superimposed on the outer surface of the first board member. Therefore, the fire resistance performance of the steel column is improved.

  The fireproof structure of the steel member according to claim 4 is the fireproof structure of the steel member according to claim 3, wherein the first joint is a horizontal joint formed between the first board members adjacent in the vertical direction. The second joint is a horizontal joint formed between the second board members adjacent in the vertical direction.

  According to the invention of claim 4, when the steel column is heated by a fire, the steel column expands in the axial direction by thermal expansion. When the first board member and the second board member follow the axial extension of the steel column, the opening of the horizontal joint becomes large. In the present invention, the amount of heat entering from the horizontal joint can be efficiently suppressed by closing the horizontal joint with the sheet member.

  The fireproof structure of the steel member according to claim 5 is the fireproof structure of the steel member according to claim 3, wherein the first joint is a horizontal joint formed between the first board members adjacent in the vertical direction. The second joint is a horizontal joint formed between the second board members adjacent in the vertical direction.

  According to the fifth aspect of the present invention, at least one of the vertical joint formed at the corner of the first board member and the vertical joint formed at the corner of the second board member is blocked by the sheet member. The amount of heat entering from at least one of these vertical joints is reduced. Therefore, the fire resistance performance of the steel column is improved.

  Since the present invention is configured as described above, it is possible to reduce the amount of heat entering from the joint between adjacent board members.

It is a perspective view which partially cuts and shows the column to which the fireproof structure of the steel member concerning one embodiment of the present invention was applied. It is an elevation (side view) which shows the column to which the fireproof structure of the steel frame member which concerns on one Embodiment of this invention was applied. (A) is the 3A-3A line expanded sectional view of FIG. 2, (B) is the 3B-3B line expanded sectional view of FIG. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. (A) And (B) is sectional drawing equivalent to FIG. 4 which shows the column to which the modification of the fireproof structure of the steel member which concerns on one Embodiment of this invention was applied. (A) And (B) is sectional drawing equivalent to FIG. 4 which shows the column to which the modification of the fireproof structure of the steel member which concerns on one Embodiment of this invention was applied. (A) is a vertical sectional view showing a column to which a modified example of the fire-resistant structure of a steel member according to an embodiment of the present invention is applied, and (B) is a cross-sectional view corresponding to FIG. 7 (A) showing a comparative example. FIG. It is sectional drawing equivalent to FIG. 3 (A) which shows the pillar to which the modification of the fireproof structure of the steel frame member concerning one Embodiment of this invention was applied. (A) And (B) is sectional drawing equivalent to FIG. 4 which shows the column to which the modification of the fireproof structure of the steel member which concerns on one Embodiment of this invention was applied. It is sectional drawing equivalent to FIG. 3 (A) which shows the pillar to which the modification of the fireproof structure of the steel frame member concerning one Embodiment of this invention was applied. It is sectional drawing equivalent to FIG. 3 (A) which shows the pillar to which the modification of the fireproof structure of the steel frame member concerning one Embodiment of this invention was applied.

  Hereinafter, a fireproof structure of a steel member according to an embodiment of the present invention will be described with reference to the drawings. In each figure, an arrow X appropriately shown indicates a horizontal direction, an arrow Y indicates a horizontal direction orthogonal to the direction indicated by the arrow X, and an arrow Z orthogonally intersects the directions indicated by the arrow X and the arrow Y. The vertical direction (vertical direction) is shown.

  The pillar 100 of the structure 10 is shown by FIG.1, FIG.2, FIG.3 (A) and FIG.3 (B). The pillar 100 is configured such that a steel pillar 110 as a steel member is fire-resistant coated with a plurality of boards 150. These boards 150 are supported by a plurality of studs 120 arranged between the board 150 and the steel column 110.

  As shown in FIGS. 3A and 3B, the horizontal cross section of the pillar 100 (the part surrounded by the board 150 constituting the wall surface of the pillar 100) has a substantially square shape. In the following description, the direction toward the steel column 110 in the cross-section of FIG. Further, studs (support members) 120 disposed at four corners 102 of the pillar 100 described later are corner studs (corner support members) 120C, and studs 120 disposed between adjacent corner studs 120C are intermediate studs ( The intermediate support member (120M) may be described while being distinguished from each other, but the configuration of both is the same.

  The steel column 110 is a square steel pipe having a substantially square horizontal cross section, and is arranged with the vertical direction (arrow Z direction) as the axial direction. A plurality of studs 120 are arranged around the steel column 110. Each stud 120 is spaced apart from the steel column 110 and is disposed with the axial direction of the steel column 110, that is, the vertical direction (arrow Z direction) as the longitudinal direction. A plurality of adjacent studs 120 are arranged at intervals in the width direction (arrow X direction or arrow Y direction) orthogonal to the axial direction of the steel column 110. In other words, a plurality of studs 120 are arranged around the steel column 110 at intervals along the arrow X direction and the arrow Y direction. In the present embodiment, the stud 120 is a light iron C-shaped steel, and the shape of its horizontal cross section is substantially rectangular.

  A lower end portion in the longitudinal direction (vertical direction) of each stud 120 is supported by a runner 130 (see FIG. 1) provided on the slab 12 constituting the housing of the structure 10. The runner 130 is made of light iron, and the vertical cross section is a groove-shaped (C-shaped cross section) rail. The runner 130 is disposed around the steel column 110 along the arrow X direction and the arrow Y direction, and is fixed to the slab 12 with screws or tap screws (not shown). The lower end portion of the stud 120 is fixed to the flange 132 of the runner 130 with a screw, a tap screw or the like (not shown). Similarly, the upper end portion (not shown) of each stud 120 in the longitudinal direction (up and down direction) is supported by a runner provided on an upper floor slab (not shown) constituting the housing of the structure 10. In addition, since the runner which supports the upper end part of the stud 120 is the structure similar to the runner 130 which supports the lower end part of the stud 120, description is abbreviate | omitted. The studs 120 are supported independently of the steel column 110 by the runners 130 and the like. Adjacent studs 120 are connected between these studs 120 by a steady bar 140 arranged in the width direction (horizontal direction) as a longitudinal direction. In addition, illustration of the runner 130 is abbreviate | omitted in FIG. 3 (A) and FIG. 3 (B).

  In this manner, the plurality of boards 150 are supported on the studs 120 that stand independently around the steel column 110. Each board 150 is disposed outside the stud 120 and surrounds the steel column 110. In other words, a plurality of studs 120 are arranged between the steel column 110 and the board 150.

  Each board 150 includes a lower board member (first board member) 160 disposed on the inner side (the steel pillar 110 side) and an upper board member (first board) for finishing and overlapping the outer surface (outer side) of the lower board member 160. 2 board members) 170 and are arranged to face the four side walls of the steel column 110, respectively. That is, the board 150 is a fireproof covering material that is also used as a finish.

  In this embodiment, the lower board member 160 is made of a reinforced gypsum board, and the upper board member 170 is made of a gypsum board, and is stacked in the out-of-plane direction (plate thickness direction) of the board 150. However, the upper board member 170 is not necessarily a gypsum board. By using a reinforced gypsum board for the upper board member 170, it is possible to further improve the fire resistance. Here, gypsum board is a fire-resistant board made of plaster-based material wrapped in special paper, and reinforced gypsum board has a fire resistance performance by adding glass fiber to the core of gypsum. It is a reinforced fireproof board. This gypsum generally contains a large amount of crystal water, and when exposed to flame or heat, this crystal water is released into the air as vapor. The heat is absorbed by the evaporation of the crystal water, thereby exhibiting a heat insulating effect.

  As shown in FIG. 2, a plurality of (three in this embodiment) the underlay board members 160 are arranged in the vertical direction according to the height of the steel column 110 with respect to each side wall of the steel column 110. ing. A horizontal joint 162 (first joint) extending in the horizontal direction is formed between the end portions 160T and 160U of the lower board member 160 adjacent in the vertical direction. In addition, the underboard member 160 is disposed across the adjacent corner studs 120 </ b> C, and ends 160 </ b> L and 160 </ b> R (see FIG. 3A) in the width direction (arrow Y direction or arrow X direction). The screws 164 are fixed to the corner studs 120 </ b> C, and the central portion in the width direction is fixed to the intermediate stud 120 </ b> M with screws 164. A plurality of screws 164 are provided at intervals in the vertical direction, penetrate the underboard member 160, and are fastened to the corner stud 120C or the intermediate stud 120M.

  As shown in FIG. 3 (A), the underboard member 160 disposed to face each side wall of the steel column 110 is abutted against the end portions 160L and 160R in the width direction. Surrounding. Specifically, the end surface of the adjacent one of the lower board members 160 in the width direction end 160L is abutted against the side surface (inner surface) of the other adjacent lower board member 160 in the width direction 160R. These corners 160L and 160R form a corner 104. Thus, the corner studs 120C are arranged at the four corners 102 of the pillar 100 formed by abutting the end portions 160L and 160R in the width direction of the underboard member 160.

  In the present embodiment, two studs 120 having different directions are erected on each corner 102, and one corner stud 120C is constituted by these two studs 120. Thereby, the rigidity of the corner stud 120C is increased, and the restraining force against the out-of-plane deformation of the lower board member 160 and the upper board member 170 is increased.

  In addition, the corner 102 is an end in the width direction (arrow X direction or arrow Y direction) where two underlay board members 160 are disposed with an angle (in the present embodiment, approximately 90 degrees) and are abutted. When the stud 120 is erected in this region surrounded by the portions 160L and 160R, the end portions 160L and 160R in the width direction of the underboard member 160 are formed by the stud 120. It means the area that can be supported. In other words, it means a region on the inner side (steel column 110 side) surrounded by the corner portion 104 formed by abutting the end portions 160L and 160R in the width direction of the underboard member 160. Further, the end portions 160L and 160R in the width direction of the lower board member 160 referred to here are not limited to the end surfaces in the end portions 160L and 160R in the width direction of the lower board member 160, but are peripheral portions (for example, side surfaces ( The concept includes the inner surface)).

  As shown in FIG. 2, a plurality of upper board members 170 stacked on the outer surface of the lower board member 160 are arranged in the vertical direction on each side wall of the steel column 110 (three in this embodiment). A horizontal joint 172 (second joint) extending in the horizontal direction is formed between the end portions 170T and 170U of the upper board member 170 that are disposed in the vertical direction. Further, the upper board member 170 is disposed over (crossing) adjacent corner studs 120C. The underboard member 160 and the upper board member 170 are disposed such that the horizontal joints 162 and 172 (see FIG. 2) are displaced in the vertical direction (vertical direction).

  Here, a sheet member 190 is provided between the lower board member 160 and the upper board member 170. The sheet member 190 is formed of a thin steel plate made of iron, stainless steel, or the like, is overlaid on the outer surface of the underlay board member 160, and is fixed to the intermediate stud 120M and the corner stud 120C with screws 192. The sheet member 190 may be fixed to the underlay board member 160 with a drilling tapping screw, staple, adhesive, or the like. On the sheet member 190 (outer surface), end portions 170T and 170U of the upper board member 170 adjacent to each other in the vertical direction are overlapped, and end surfaces of the end portions 170T and 170U are abutted with each other. In other words, the sheet member 190 is disposed across the inner surfaces of the end portions 170T and 170U of the upper board member 170 adjacent to each other in the vertical direction, that is, the end portions 170T and 170U forming the horizontal joint 172. The ground 172 is closed from the inner side (inner surface side). In FIG. 3B, illustration of the sheet member 190 is omitted.

  Further, the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction are fixed to the corner stud 120C and the intermediate stud 120M with screws 174, respectively. The screw 174 penetrates the end portion 170T (or the end portion 170U) of the upper board member 170 and the lower board member 160 (the sheet member 190 also penetrates at a portion where the sheet member 190 is present), and the corner stud 120C or the intermediate stud. It is held at 120M. Thereby, opening of the horizontal joint 172 formed between the edge parts 170T and 170U of the upper board member 170 adjacent to the up-down direction is suppressed. The upper board member 170 may be adhered to the lower board member 160 with an adhesive applied to the outer surface of the lower board member 160, or may be fixed to the lower board member 160 with a drilling tap screw, staple, or the like. May be.

  As shown in FIG. 3B, the end portions 170L and 170R in the width direction (arrow Y direction or arrow X direction) of the upper board member 170 facing each side wall of the steel column 110 are abutted against each other. And surrounds the steel column 110. Specifically, the end surface of the adjacent one of the upper board members 170 in the width direction of the other upper board member 170 is abutted with the side surface of the other upper board member 170 in the width direction. 106 is formed.

  The side surface of the end portion 170R of the adjacent one of the upper board members 170 includes not only the end surface of the end portion 170L of the other adjacent upper board member 170 but also the end portion 160L in the width direction of the lower board member 160. The end face is also abutted. The above-described method of abutting the end portions 160L and 160R in the width direction of the lower board member 160 and the end portions 170L and 170R in the width direction of the upper board member 170 is merely an example and is limited to this. It is not a thing.

  Although not shown in the drawings, rock wool, fireproof sealant, etc. such that there is no gap between the lower board member 160 and the upper board member 170 and the slab 12 and the upper floor slab (not shown). By sandwiching a joint material having fire resistance, it is possible to further improve fire resistance and sound insulation.

  Next, the effect | action of the fireproof structure of the steel frame member which concerns on this embodiment is demonstrated.

  By surrounding the steel column 110 constituting the column 100 of the structure 10 with a board 150 and applying a fireproof coating, an increase in the temperature of the steel column 110 during a fire can be suppressed. As a result, it is possible to suppress the influence of the decrease in yield strength and thermal expansion of the steel column 110 at the time of a fire. Further, by overlapping the finishing board member 170 on the outer surface of the lower board member 160, it is possible to omit the finishing material of the column 100 while improving the fire resistance.

  Furthermore, by supporting the board 150 with the studs 120 arranged around the steel column 110, the board 150 can be constructed with higher accuracy than the configuration in which the board 150 is directly joined to the outer surface of the steel column 110 with an adhesive or the like. can do. Therefore, the construction of the board 150 (fireproof covering of the steel column 110) and the interior work such as the wall can be performed by the same contractor. Further, the stud 120 is disposed at a distance from the steel column 110 and is supported independently from the steel column 110 by a runner 130 provided on the slab 12 or the like (see FIG. 1). Therefore, compared to the configuration in which the stud 120 is joined by welding or the like along the outer surface of the steel column 110, the stud 120 can be installed with high accuracy without depending on the accuracy of the steel column 110.

  Also, compared to a structure in which a spraying material (fireproof coating material) such as rock wool is sprayed on the steel column 110 and the periphery is surrounded by a finishing board, the spraying material is omitted as in this embodiment. Since the steel column 110 is surrounded by a board 150 that uses both a fireproof coating material and a finishing material, the finishing width of the cross section (horizontal cross section of the column 100) perpendicular to the axial direction surrounded by the board 150 is increased. As a result, the effective area of the living room can be increased.

  Here, the gypsum board and the gypsum constituting the gypsum board contain a large amount of crystal water, and when exposed to flame or heat, the crystal water is released into the air as vapor. This evaporation of crystal water absorbs heat and exhibits a heat insulating effect. Similarly, the upper board member 170 made of gypsum board exhibits a heat resistance effect due to evaporation of the crystal water. In this case, the temperature rises from the outer surface side exposed to flame and heat. Crystal water evaporates. Therefore, the outer surface side of the upper board member 170 contracts. Thereby, like an imaginary line (two-dot chain line) shown in FIG. 4, the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction are deformed (curved) so as to curve outward, The horizontal joint 172 formed between these end portions 170T and 170U may open and become a weak point. The same applies to the underlay board member 160 made of reinforced gypsum board.

  As a countermeasure, in this embodiment, a sheet member 190 is provided between the lower board member 160 and the upper board member 170. The sheet member 190 is disposed across the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction. Therefore, even if the horizontal joint 172 is opened, the horizontal joint 172 is blocked by the sheet member 190, so that the amount of heat entering the pillar 100 from the horizontal joint 172 is reduced. Further, since the sheet member 190 suppresses the exposure of the lower board member 160 near the horizontal joint 172, the temperature increase of the lower board member 160 is reduced. Therefore, the fireproof performance of the steel column 110 is improved. In particular, in the present embodiment, the fire resistance performance of the steel column 110 can be efficiently improved by closing the horizontal joint 172 with the sheet member 190. More specifically, when the steel column 110 is heated by fire heat or the like, the steel column 110 thermally expands and extends in the axial direction (vertical direction). When the lower board member 160 and the upper board member 170 follow the axial extension of the steel column 110, the opening of the horizontal joint 172 and the like increases. Thus, by closing the horizontal joint 172 that tends to be a weak point with the sheet member 190, the fire resistance performance of the steel column 110 can be improved efficiently.

  Furthermore, in this embodiment, as shown in FIG. 4, the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction are connected to the corner stud 120C (see FIG. 3B) and the intermediate stud 120M with screws 174. As a result, the opening of the horizontal joint 172 formed between the end portions 170T and 170U is suppressed. Further, since the lower board member 160 is fixed to the corner stud 120C and the intermediate stud 120M by the screws 174, not only the ends 170T and 170U of the upper board member 170, but the support performance of the lower board member 160 is improved.

  Further, the lower board member 160 and the upper board member 170 are supported by the corner stud 120C and the intermediate stud 120M. Therefore, the heat of the upper board member 170 passes through the sheet member 190 as in the conventional configuration (for example, Patent Document 1) in which the steel frame is attached to the steel frame via a T-shaped metal plate (laying plate) that closes the joint. Therefore, it is not transmitted to the steel column 110. Accordingly, a decrease in fire resistance is suppressed.

  Thus, according to the fireproof structure of a steel member according to this embodiment, the amount of heat entering from the horizontal joint 172 formed between the upper board members 170 adjacent in the vertical direction can be reduced.

  Next, a modified example of the fireproof structure of the steel member according to the present embodiment will be described.

  In the above embodiment, the sheet member 190 is provided between the lower board member 160 and the upper board member, but the present invention is not limited to this. For example, a sheet member 190 may be provided on the outer surface of the upper board member 170 as in the modification shown in FIG. Specifically, the sheet member 190 is disposed across the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction, and the lateral joint 172 formed between these end portions 170T and 170U is outside ( It is closed from the outside. Thereby, since the horizontal joint 172 can be closed with the sheet member 190 while visually observing, the workability is improved. Although the sheet member 190 is fixed to the upper board member 170 or the like with screws 174, it may be fixed to the outer surface of the upper board member 170 with a drilling tapping screw, staple, adhesive, or the like (not shown).

  5B, the sheet member 190 may be disposed between the lower board member 160 and the upper board member 170, and the horizontal joint 162 of the lower board member 160 may be blocked. Specifically, the sheet member 190 is disposed across the end portions 160T and 160U of the lower board member 160 adjacent in the vertical direction, and the lateral joint 162 formed between the end portions 160T and 160U is outside (outside surface). From the side). Thereby, the amount of heat entering the pillar 100 from the horizontal joint 162 is suppressed.

  Further, as in the modification shown in FIG. 6A, a sheet member 190 may be provided on the inner surface of the lower board member 160, and the horizontal joint 162 of the lower board member 160 may be closed from the inner side (inner surface side). In this case, a sheet member 190 may be provided in advance on the inner surface of the lower board member 160 before the lower board member 160 is fixed to the intermediate stud 120M or the like with the screws 164.

  6B, the horizontal joint 162 of the lower board member 160 and the horizontal joint 172 of the upper board member 170 may be closed with one sheet member 190. That is, the lower board member 160 and the upper board member 170 are disposed so that the horizontal joints 162 and 172 overlap each other, and the sheet member 190 is interposed between the lower board member 160 and the upper board member 170. Is provided. The sheet member 190 extends over the end portions 170T and 170U of the upper board member 170 adjacent in the vertical direction and is arranged over the end portions 160T and 160U of the lower board member 160 adjacent in the vertical direction. The ground 162 and 172 are respectively closed. In this structure, since it is not necessary to shift the horizontal joints 162 and 172, workability is improved. The horizontal joint 162 and the horizontal joint 172 do not necessarily overlap each other. It is only necessary that the single joint member 190 can block the horizontal joints 162 and 172, and the horizontal joint 162 and the horizontal joint 172 may be displaced in the vertical direction.

  In the above embodiment, the ends 170T and 170U of the upper board member 170 adjacent in the vertical direction are fixed to the corner stud 120C and the intermediate stud 120M with the screws 174, but the screws 174 can be omitted as appropriate. For example, in the modification shown in FIG. 7A, four upper board members 170E, 170F, 170G, and 170H are arranged in the vertical direction. The horizontal joint 172 formed between the end portions 170T and 170U of the upper board members 170F and 170G adjacent in the vertical direction is closed by the sheet member 190. These ends 170T and 170U are not provided with screws or the like, and the horizontal joint 172 is easy to open. On the other hand, the lower end 170U (the other end) opposite to the upper end 170T (one end) where the sheet member 190 is provided in the upper board member 170F is fixed to the intermediate stud 120M or the like with screws 174. Similarly, the upper end 170T (the other end) opposite to the lower end 170U (one end) where the sheet member 190 is provided in the upper board member 170G is fixed to the intermediate stud 120M or the like with a screw 174. Yes.

  Here, in the horizontal joint 172 formed between the upper board members 170F and 170G adjacent in the vertical direction, the upper board members 170F and 170G are contracted or warped due to fire heating, and in FIG. 7A. Like the imaginary line (two-dot chain line), the ends 170T and 170U of the upper board members 170F and 170G move (separate) to open. In this modification, the end portions 170T and 170U of the upper board members 170F and 170G forming the horizontal joint 172 are not fixed to the intermediate stud 120M, and are easy to move. On the other hand, the lower end 170U of each upper board member 170F and the upper end 170T of the upper board member 170 are fixed to the intermediate stud 120M or the like by screws 174 and are difficult to move. Accordingly, when the upper board member 170F is contracted or warped, the upper board member 170F moves to the lower end 170U as a whole, and therefore the movement amount of the lower end 170U is relatively small. That is, as shown in FIG. 7 (B), compared with a configuration in which both the upper end portion 170T and the lower end portion 170U of each upper board member 170F are fixed to the intermediate stud 120M or the like with screws 174, The amount of movement of the lower end 170U of the board member 170F is reduced. Accordingly, since the opening of the horizontal joint 172 formed on the lower end portion 170U side of the upper board member 170F is reduced, the sheet member 190 and the like for closing the horizontal joint 172 can be omitted. Similarly, the sheet member 190 that closes the horizontal joint 172 formed on the upper end 170T side of the upper board member 170G can be omitted. Therefore, cost reduction can be achieved. As described above, in the present modification, the horizontal joint 172 that is easy to open is provided between the end portions 170T and 170U of the upper board members 170F and 170G that are adjacent in the vertical direction, and the position where the sheet member 190 is provided is localized. While ensuring performance, it is possible to improve workability and reduce costs.

  Moreover, in the said embodiment, although the horizontal joint 172 of the upper board member 170 adjacent to an up-down direction is block | closed with the sheet | seat member 190, it is not restricted to this. For example, in the modification shown in FIG. 8, a plurality (two in this modification) of the upper board members 170A and 170B are arranged on the outer surface of the lower board member 160 in the width direction (arrow X direction). Has been. Therefore, a vertical joint 176 (second joint) extending in the vertical direction is formed between the end portions 170L and 170R of the upper board members 170A and 170B adjacent in the width direction. A sheet member 190 is provided between the lower board member 160 and the upper board members 170A and 170B. The sheet member 190 is arranged across the end portions 170L and 170R of the upper board members 170A and 170B adjacent in the width direction, and closes the vertical joint 176 from the inner side (inner surface side). Thereby, the effect | action and effect similar to the said embodiment can be acquired. The sheet member 190 is fastened to the intermediate stud 120M with a screw 164.

  Further, as shown in FIG. 8, a sheet member 190 may be provided between a corner portion 104 formed by abutting the end portions 160L and 160R in the width direction of the underboard member 160 and the corner stud 120C. . The sheet member 190 has an L-shaped cross section and is disposed across the end portions 160L and 160R in the width direction of the underlay board member 160. The vertical joint 168 (first joint) formed in the corner portion 104 by the sheet member 190 is disposed. ) Is blocked from the inside (inner side). Here, the corner portion 104 is formed by abutting the end portions 160L and 160R of the adjacent underboard member 160 with a predetermined angle (for example, 90 degrees). Therefore, the vertical joint 168 formed in the corner 104 is compared with the vertical joint 176 formed between the end portions 170L, 170R of the upper board members 170A, 170B adjacent in the width direction in the same plane, Generally easy to open. Therefore, by closing the vertical joint 168 formed in the corner portion 104 with the sheet member 190 and suppressing the amount of heat entering from the vertical joint 168, the fire resistance can be improved efficiently. Although not shown, a sheet member 190 is provided between the corner portion 104 of the lower board member 160 and the corner portion 106 of the upper board member 170, and the vertical joints formed on these corner portions 104 and 106 are provided. 168 (first joint) and vertical joint 178 (second joint) may be closed, or the sheet member 190 is overlapped on the outer surface of the corner portion 106 of the upper board member 170 and the vertical joint formed on the corner portion 106. 178 may be closed. That is, it is only necessary that at least one of the vertical joints 168 and 178 formed in the corner portions 104 and 106 is closed by the sheet member 190.

  In the above embodiment, the board 150 is configured by stacking the lower board member 160 and the upper board member 170, but the present invention is not limited to this. For example, as shown in FIG. 9A, the board 150 may be configured by a single board member 152 (first board member) without overlapping a plurality of board members. In this configuration, the sheet member 190 is stacked on the inner surface of the board member 152, and the horizontal joint 154 formed between the end portions 152 </ b> T and 152 </ b> U of the board member 152 adjacent to each other in the vertical direction is formed on the inner side ( It is blocked from the inner side. Further, as shown in FIG. 9B, the sheet member 190 may be overlapped on the outer surface of the board member 152, and the horizontal joint 154 may be closed from the outside (outer surface side). Note that the end portions 152T and 152U of the board member 152 adjacent to each other in the vertical direction are fixed to the intermediate stud 120M or the like with screws 156.

  Further, the board 150 may be configured by stacking three or more board members. That is, one or more board members may be further stacked on the outer surface of the upper board member 170, or the lower board member 160 and the upper board member 170 may be placed on the outer surface of the one or more board members supported by the stud 120. May be stacked.

  Furthermore, as shown in FIG. 10, a support board 182 that supports the sheet member 190 may be provided. Specifically, a plurality (two in this modification) of board members 152A and 152B are arranged in the width direction on each side wall of the steel column 110 and surround the steel column 110. A support board 182 is provided between the board members 152A and 152B and the steel column 110. The support board 182 is disposed over the adjacent intermediate stud 120M and corner stud 120C. On the support board 182, the end surfaces of the end portions 152L and 152R of the board members 152A and 152B adjacent in the width direction are abutted with each other, and a vertical joint 158 (first joint) is provided between the end portions 152L and 152R. ) Is formed. A sheet member 190 is provided between the support board 182 and the board members 152A and 152B. The sheet member 190 is disposed across the end portions 152L and 152R of the board members 152A and 152B adjacent in the width direction, and closes the vertical joint 158 from the inner side (inner surface side). Thereby, hot air, a flame, etc. which penetrate | invade from the vertical joint 158 are suppressed. The sheet member 190 is fixed to the intermediate stud 120M with a screw 184 together with the support board 182.

  Thus, by sandwiching the sheet member 190 between the support board 182 and the board members 152A and 152B, deformation (warp or the like) of the sheet member 190 is suppressed. Therefore, the shielding performance of the vertical joint 158 by the sheet member 190 is improved. In addition, since the vertical joint 158 is also blocked by the support board 182, the fire resistance performance of the steel column 110 is improved. Note that the support board 182 does not need to surround the steel column 110 and may be provided as appropriate according to the joints (vertical joints, horizontal joints) of the board members 152A and 152B.

  Moreover, in the said embodiment, although the thin steel plate was used as a sheet | seat member, you may use the foam sheet (thermal expansion sheet) which foams at the time of high temperature. By closing the joint with the foamed sheet, the foamed sheet is foamed and a heat insulating layer is formed in the event of a fire. Thereby, the amount of heat entering from the joint is suppressed.

  Furthermore, in the said embodiment, although the underlay board member 160 was comprised with the gypsum board (To be exact, the underlay board member 160 is the reinforcement | strengthening gypsum board reinforced with the fiber), It is not limited to this. You may be comprised with fireproof boards other than a gypsum board, for example, a fiber mixed calcium silicate board, a mortar board, a rock wool board, a ceramic fiber board, a PC board, an ALC panel, an extrusion-molded cement board, etc. These fireproof boards are subject to expansion / contraction, warping, breakage, etc. according to their characteristics during a fire, but the fireproof performance of the steel column 110 is improved by applying the fireproof structure of the steel member according to the above embodiment. be able to. Further, the underlay board member 160 or the like may be configured by a board member (such as a decorative board) other than the fireproof board.

  Further, in the above-described embodiment, the corner stud 120C is configured by the two studs 120. However, the corner stud 120C may be configured by two or more studs 120, and as shown in FIG. You may comprise. Furthermore, the intermediate stud 120M may be provided according to the horizontal cross-sectional area of the steel column 110, and the arrangement and number thereof can be changed as appropriate, and can be omitted.

  Furthermore, in the said embodiment, although the stud 120 was arrange | positioned at intervals with the steel column 110, it is not limited to this. A spacer may be sandwiched between the stud 120 and the steel column 110. Alternatively, part or all of the stud 120 in the longitudinal direction may be in contact with the steel column 110. However, even if the spacer is sandwiched or contacted, it is desirable that the stud 120 be supported independently from the steel column 110 from the viewpoint of workability.

  Moreover, in the said embodiment, although the stud 120 of a C-shaped cross section was used as a supporting member, it is not limited to this. For example, a support member having a square shape, a circular shape (including an ellipse), a tubular shape, or an H-shaped cross section may be used. Furthermore, although the stud 120 is supported by the runner 130 etc. provided in the slab 12, it is not limited to this. The support structure of the stud 120 may be any support structure. For example, an angle having an L-shaped cross section may be provided on the slab 12 or the beam, and the stud 120 may be fixed to this angle.

  Moreover, in the said embodiment, although the horizontal cross section of the steel column 110 was a substantially rectangular (substantially rectangular or substantially square) steel pipe, it is not limited to this, For example, even if it is a circular steel pipe, H-section steel, etc. good. Moreover, if it is a tubular steel column (steel pipe column), concrete, mortar, etc. may be filled in it.

  Furthermore, a member other than the stud 120 may be disposed between the steel column 110 and the board 150. For example, a heat insulating material such as glass wool may be disposed between the steel column 110 and the board 150. In other words, a heat insulating material such as glass wool is wound around the steel column 110 and the outside of the heat insulating material is surrounded by a board 150 (fireproof coating). The horizontal cross section of the pillar 100 is substantially rectangular (substantially rectangular or substantially square), but may be a polygonal shape such as a circle, a triangle, or a pentagon. Alternatively, a shape in which a part or all of the sides are curved may be used.

  Moreover, in the said embodiment, although the fireproof structure of the steel column which comprises the structure of a steel frame concrete structure was demonstrated to the example, it is not limited to this. For example, the present invention can also be applied to a fire-resistant structure of a steel member constituting a steel structure such as a steel-concrete structure or a steel-rebar structure. It can also be applied to a composite fireproof structure (for example, a fireproof structure in which a steel column is surrounded by a wall and a fireproof board). Furthermore, the present invention can be applied to a steel beam fireproof structure. When applied to a steel beam, the structure of the steel column 110 described in the above embodiment is substantially the same as the structure tilted by 90 °, and the axial direction of the steel beam is a horizontal direction or a substantially horizontal direction.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment, You may use combining embodiment and various aspects in the range which does not deviate from the summary of this invention. Of course, it can be implemented.

104 Corner 106 Corner 110 Steel column (steel member)
120 Stud (support member)
152 Board member (first board member)
154 Horizontal joint (first joint)
158 Longitudinal joint (first joint)
160 Underboard member (first board member)
162 Horizontal joint (first joint)
168 Longitudinal joint (first joint)
170 Upper board member (second board member)
172 Horizontal joint (second joint)
178 Vertical joint (second joint)
176 Longitudinal joint (second joint)
178 Vertical joint (second joint)
190 Sheet material

Claims (5)

A plurality of first board members surrounding the steel member with a space from the steel member;
A support member disposed between the steel member and the first board member with the axial direction of the steel member as a longitudinal direction, and supporting the first board member;
A sheet member for closing the first joint formed between the first board members;
A fireproof structure of a steel member comprising A plurality of first board members surrounding the steel member with a space from the steel member;
A support member disposed between the steel member and the first board member with the axial direction of the steel member as a longitudinal direction, and supporting the first board member;
A plurality of second board members stacked on an outer surface of the first board member;
A sheet member that closes at least one of the first joint formed between the first board members and the second joint formed between the second board members;
A fireproof structure of a steel member comprising   The fireproof structure of a steel member according to claim 2, wherein the steel member is a steel column arranged with the vertical direction as an axial direction. The first joint is a horizontal joint formed between the first board members adjacent in the vertical direction;
The fireproof structure of a steel member according to claim 3, wherein the second joint is a horizontal joint formed between the second board members adjacent in the vertical direction. The first joint is a vertical joint formed at a corner where the ends in the width direction perpendicular to the axial direction of the first boat member are abutted,
4. The fireproof structure for a steel member according to claim 3, wherein the second joint is a vertical joint formed at a corner portion where the end portions in the width direction orthogonal to the axial direction of the second board member are abutted with each other. .

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