JP5839787B2 - Fire-resistant structure of steel members - Google Patents

Description

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

  Steel fireproof coating is a typical measure to protect steel buildings from fire. By applying fireproof coating to the steel column, the temperature rise of the steel column during a fire is suppressed to within the allowable value, and the impact of reduced member strength and thermal expansion. It plays a role to suppress. The fireproof structure of steel columns is required to have fireproof performance by structure, part, and floor number of the building.

  For example, as a structure for covering a steel member with fireproofing, there is known a structure in which a fireproof covering material such as rock wool is sprayed on the outer periphery of the steel member and the periphery is surrounded by a finishing board.

  Further, Patent Document 1 has a structure in which a spraying material is omitted, a base material is attached to a corner portion of a steel member, and a fireproof board for finishing is attached to the base material, thereby forming a thin finish fireproof coating. It has been proposed (see Patent Document 1).

  However, as in Patent Document 1, the structure in which the fireproof board is attached to the base material directly attached to the steel member is affected by the accuracy of the steel member, so that the fireproof board is secured while ensuring the desired accuracy. It is considered difficult to construct a board. For this reason, the construction of the fireproof board takes time and the construction cost of the fireproof board increases.

JP 2002-180569 A

  In view of the above, it is an object of the present invention to improve the fire resistance performance of a steel member while preventing an increase in the construction cost of the board member due to the accuracy of the steel member.

According to the first aspect of the present invention, there is provided a plurality of board members surrounding the steel member constituting the structure with a space from the steel member, and the axial direction of the steel member is between the steel member and the board member. A plurality of support members arranged in the longitudinal direction and spaced apart in the width direction perpendicular to the axial direction, and supporting the board member, wherein the support member has a strong axis direction and a weak axis direction. And is arranged with the out-of-plane direction of the board member as the strong axis direction, and both ends in the longitudinal direction are supported by structural members other than the steel member constituting the structure, A first support in which a gap is formed between the steel frame members and one and the other board members are fixed and supported at corners where the widthwise ends of the board members are abutted against each other. and member, the other of the board members A second support member in contact with the supporting the first support member without constant, is the arrangement, the weak axial direction of the the strong axial end of the first support member, said second support member The end portion is disposed in contact with the end portion.
According to a second aspect of the present invention, there is provided a plurality of board members surrounding the steel member constituting the structure with a space from the steel member, and the axial direction of the steel member between the steel member and the board member. A plurality of support members arranged in the longitudinal direction and spaced apart in the width direction perpendicular to the axial direction, and supporting the board member, wherein the support member has a strong axis direction and a weak axis direction. The support member is disposed with the out-of-plane direction of the board member as a weak axis direction, and both ends in the longitudinal direction are supported by a structural member other than the steel member constituting the structure. At the same time, a gap is formed between the steel member and one and the other board members are fixed and supported at corners where the widthwise ends of the board members are abutted against each other. First support member and the other front A second support member in contact with the supporting the first supporting member without fixing the board member, is the arrangement, and a weak axial end of said first support member, said second support member The strong axial direction end part is arranged in contact with each other.

Accordingly, the support member for supporting the board member is supported by the structural member other than the steel member constituting the structure at both ends in the longitudinal direction , and a gap is formed between the steel member and the support member. A board member can be constructed without being affected by accuracy.

  In addition, even if the portion where the end portions in the width direction of the board member are abutted at the corner portion is opened, the first support member and the second member that are arranged at the corner portion of the flame and heat entering from the opened gap Therefore, the steel member is prevented from being directly heated, and as a result, the temperature rise of the steel member is delayed.

Thus, compared with the structure to which the present invention is not applied, the fire resistance performance of the steel member is improved while preventing an increase in the construction cost of the board member due to the accuracy of the steel member.
According to the first aspect of the present invention, the out-of-plane rigidity of the board member is improved as compared with the structure in which the support member is arranged with the direction other than the out-of-plane direction of the board member as the strong axis direction.
In addition, in the invention according to claim 2, the finishing width of the cross section orthogonal to the axial direction surrounded by the board member is compared with the structure in which the supporting member is arranged with the direction other than the out-of-plane direction of the board member as the weak axis direction. Is suppressed.

According to a third aspect of the present invention, the steel member is a steel column disposed with the vertical direction as an axial direction, and the support member is erected with the vertical direction as a longitudinal direction.

  Therefore, the fire resistance performance of the steel column is improved while preventing an increase in the construction cost of the board member due to the accuracy of the steel column.

  Further, for example, the deformation of the board member in the out-of-plane direction is suppressed without increasing the rigidity of the support member or increasing the number of the support member as compared with the configuration in which the support member is arranged with the horizontal direction as the longitudinal direction.

According to a fourth aspect of the present invention, the longitudinal end portion of the support member is attached to an attachment member provided in the structure, and the frictional resistance is reduced between the attachment member and the longitudinal end portion of the support member. A material or elastic member is sandwiched.

  Therefore, compared to a configuration in which the attachment member and the longitudinal end portion of the support member are in direct contact with each other, a squeak noise generated by rubbing the attachment member and the longitudinal end portion of the support member is reduced.

According to a fifth aspect of the present invention, a heat insulating member is provided on at least one of the first support member and the second support member.

  Therefore, at least one of the first support member and the second support member arranged at the corner exhibits a high heat insulating effect. Therefore, compared with the structure in which both the first support member and the second support member are not provided with a heat insulating material, when the portion where the end portions in the width direction of the board member are abutted at the corner is opened The heat resistance performance of is improved.

According to a sixth aspect of the present invention, at least one end of the support member in the longitudinal direction is supported by the structure without being restricted in the longitudinal direction.

  Therefore, even if the structure supporting the longitudinal end portion of the support member extends in the axial direction due to heat, the support member does not extend following the support member. Is prevented from opening.

  As described above, according to the present invention, compared with the structure to which the present invention is not applied, the fire performance of the steel member is improved while preventing the increase in the construction cost of the board member due to the accuracy of the steel member. be able to.

1 is a partially cutaway perspective view showing a column to which a fireproof structure of a steel frame member according to a first embodiment of the present invention is applied. It is sectional drawing of the direction orthogonal to the axial direction in the pillar of FIG. It is sectional drawing of the direction along the axial direction in the pillar of FIG. (A) is the expanded sectional view which expanded the corner part of the horizontal surface figure of FIG. 2, (B) is sectional drawing of the direction orthogonal to the axial direction in a stud. It is an expanded sectional view corresponding to Drawing 4 (A) of the 1st modification. (A) which shows the site | part by which the edge part of the stud of a 2nd modification is supported by the runner is sectional drawing of the direction along an axial direction, (B) is the front view seen from the outer side to the inner side. It is sectional drawing corresponding to FIG. 1 which shows the column to which the fireproof structure of the steel frame member which concerns on 2nd embodiment of this invention was applied. It is sectional drawing corresponding to FIG. 1 which shows the pillar to which the fireproof structure of the steel frame member concerning 3rd embodiment of this invention was applied.

<First embodiment>
The pillar comprised by applying the fireproof structure of the steel member which concerns on 1st embodiment of this invention using FIGS. 1-4 is demonstrated. An arrow Z in the figure indicates the vertical direction.

As shown in FIGS. 1 to 3, the pillar 100 of the structure 10 has a structure in which a steel pillar 110 is fire-coated with a board member 150. As shown in FIGS. 1 and 2, the horizontal cross section of the pillar 100 (the part surrounded by the board member 150 that constitutes the wall surface of the pillar 100) has a substantially square shape, and the steel pillar in the cross section of the pillar 100. a direction toward the 110 and inward, to the direction away from the steel frame pillars 11 0 and outward.
Also, as shown in FIGS. 1 and 3, the vertical direction is indicated by an arrow Z, the X direction and the Y direction are orthogonal, and the Z direction is orthogonal to the X and Y directions. In some cases, “X” or “Y” is appended to the sign of a member arranged along the X direction or the Y direction. Further, the upper member may be distinguished by adding “U” after the reference numeral and “L” to the lower member.

  As shown in FIG. 1 and FIG. 2, in this embodiment, the steel column 110 is a steel pipe having a substantially positive horizontal cross section. As shown in FIGS. 1 to 3, the periphery of the steel column 110 is surrounded by a board member 150. In addition, the steel column 110 is arrange | positioned by making the perpendicular direction (Z direction) into an axial direction.

Board member 150 includes a underlayment boards 152 arranged on the inside (steel columns 110 side), the overlay board 154 finish combined superimposed on the outer surface of the underlayment board 152, in being configured. In this embodiment, the lower board 152 is made of a reinforced gypsum board, and the upper board 154 is made of a gypsum board. That is, the board member 150 is a fireproof coating material that is also used as a finish.

  Here, gypsum board is a fire-resistant board made of plaster-based material wrapped in special paper, and reinforced gypsum board is strengthened by adding glass fiber etc. to the core of gypsum It is considered a fireproof board. Note that gypsum usually contains a large amount of crystal water, and when exposed to flame or heat, this crystal water is released into the air as vapor. And heat insulation is exhibited by absorbing heat by evaporation of crystal water.

As shown in FIGS. 1 and 3, the inner underboard 152 and the outer upper board 154 constituting the board member 150 are arranged side by side in the vertical direction (vertical direction). However, being arranged to be shifted is positioned vertically (vertical direction) and the horizontal joint 154S of horizontal joint 152S and overlay board 154 of the underlayment board 152.

  As shown in FIG. 1 to FIG. 3, the board member 150 configured by joining the lower board 152 and the upper board 154 in the out-of-plane direction and joining them is spaced apart from the outside of the steel column 110 (another one). In other words, the stud 120 is supported by the standing stud 120 (between the steel column 110 and the board member 150).

  As shown in FIG. 4, in this embodiment, the stud 120 is a light iron C-shaped steel. The shape of the horizontal cross section of the stud 120 is substantially rectangular, and has a cross sectional shape having a strong axis direction K and a weak axis direction J.

  The strong axis is the cross-sectional principal axis that maximizes the cross-sectional secondary moment, and the weak axis is the cross-sectional principal axis that minimizes the cross-sectional secondary moment. In addition, the cross-section main axis is a set of axes having a maximum (strong axis) and minimum (weak axis) cross-sectional secondary moment with respect to the axis among two orthogonal axes passing through the centroid of the cross section.

  Further, in this embodiment, since the horizontal cross-sectional shape of the stud 120 is substantially rectangular, the strong axis direction K and the longitudinal direction (direction along the long side of the rectangle) in the horizontal cross section coincide or substantially coincide with each other, and the weak axis The direction J and the short direction (direction along the short side of the rectangle) match or substantially match.

  As shown in FIGS. 1 to 3, the stud 120 is arranged with the axial direction of the steel column 110, that is, the vertical direction (Z direction) as the longitudinal direction. In addition, a plurality of studs 120 are arranged at intervals in the width direction orthogonal to the axial direction. In other words, in the present embodiment, a plurality of studs 120 are arranged at intervals along the X direction and the Y direction. Has been placed.

  As shown in FIG. 3, the ends 120U and 122L in the vertical direction (longitudinal direction) of the stud 120 are supported by runners 130U and 130L provided on the upper and lower slabs 12 and 14 constituting the casing of the structure 10. Yes. Therefore, the stud 120 is supported independently from the steel column 110.

  As shown in FIG. 1 and FIG. 3, the runners 130U and 130L are made of light iron, and the vertical cross section is a groove-shaped rail. The runners 130U and 130L are provided on the slabs 12 and 14 around the steel column 110 along the X direction and the Y direction, respectively. In the present embodiment, the end portions 120U and 120L in the vertical direction (longitudinal direction) of the stud 120 are fixed to the flange 132 constituting the runners 130U and 130L with tap screws or staples (not shown).

  As shown in FIG. 1 and FIG. 2, in this embodiment, four corners 102 (described later) inside the pillar 100 surrounded by the board member 150, and between each corner 102 (the center in the width direction). ) And studs 120 are respectively set up. Further, as shown in FIG. 1, an anti-swaying horizontal bar 140 is provided between the studs 120 with the width direction (horizontal direction) as a longitudinal direction.

  As shown in FIGS. 1 to 3, a board member 150 is fixed to the stud 120. In this embodiment, first, the lower board 152 is fixed to the stud 120 with a drilling tapping screw 142 (see FIGS. 1 and 2), and then the upper board 154 is joined to the lower board 152 with an adhesive and a staple (not shown). . The upper board 154 may also be fixed to the stud 120 by penetrating the lower board 152 with a drilling tapping screw 142.

  As shown in FIG. 3, in this embodiment, the upper and lower end surfaces 150U and 150L of the board member 150 and the slab 12 are formed so that there is no gap between the upper and lower end surfaces 150U and 150L of the board member 150 and the slabs 12 and 14. , 14 are sandwiched between fireproof sealing materials 144U and 144L made of rock wool or the like (see also FIG. 6A). In addition, the structure where the fireproof sealing materials 144U and 144L are not sandwiched may be used.

Next, the arrangement of the studs 120 will be described.
As shown in FIG. 2, each stud 120 is arranged with the out-of-plane direction (plate thickness direction) of each board member 150 constituting the wall surface of the pillar 100 as the strong axis direction K (see FIG. 4B). Yes. As shown in FIG. 1, a space between the flanges 132 (groove width) of the runner 130 is set to a width in which the strong axis direction K of the stud 120 is accommodated.

  As shown in FIG. 2, the four corner portions 102 of the pillar 100 are abutted against the end portions 150 </ b> T in the width direction (X direction and Y direction) of each board member 150.

  To describe an example in more detail, in the corner portion 102 shown in FIG. 4A, the end surface of the end board 152X of the other board member 150X is placed on the side surface 154YTS of the end board 152Y of the lower board 152Y of one board member 150Y. 152XTT is abutted. Further, the end surface 154YTT of the end portion of the lower board 152Y of one board member 150Y and the end surface 154YTT of the end portion of the upper board 154Y are abutted against the side surface 154XTS of the end portion of the upper board 154X of the other board member 150X. ing

  At the corner 102, the end 120YK in the strong axis direction K (see FIG. 4B) of the stud 120Y that supports the board member 150X and the board member 150Y and the stud 120X that supports the board member 150X. It arrange | positions so that the edge part 120XJ of the weak axis direction J (refer FIG. 4 (B)) may contact.

  Note that the end portion 120K of the stud 120 and the end portion 120S of the stud 120 are not necessarily in contact with each other. It may be a close state where there is a slight gap in a part of the longitudinal direction of the stud 120 or over the entire region.

  Further, as shown in FIG. 1, the upper and lower ends 120U and 120L of the stud 120 attached to the runner 130 are sandwiched between the flanges 132 of the runner 130, but the plate thickness of the runner 130 is very thin. Therefore, it is in a close state.

In this embodiment, as shown in FIG. 4, in the corner portion 102, the board members 150Y and 150X are fixed to the stud 120Y supporting the one board member 150Y and the other board member 150X with a drilling tapping screw 142. have been, the stud 120 X which supports the other board member 150X is not fixed by drilling tapping screws 142. However, the board member 150X is supported in contact with the stud 120 X.

Next, functions and effects of the present embodiment will be described.
By surrounding the steel column 110 constituting the column 100 of the structure 10 with a board member 150 and applying a fireproof coating, the temperature rise of the steel column 110 at the time of fire is suppressed, and as a result, the steel column 110 at the time of fire is suppressed. The influence of proof stress and thermal expansion can be suppressed.

  The stud 120 that supports the board member 150 surrounding the steel column 110 has end portions 120U and 120L in the longitudinal direction supported by runners 130 provided on the slabs 12 and 14 (see FIG. 3). Moreover, the stud 120 is arranged with a space from the steel column 110. Therefore, the stud 120 can be installed without being affected by the accuracy of the steel column 110. Therefore, for example, the board member 150 can be easily and accurately constructed as compared with a configuration in which the board member 150 is bonded and joined directly to the steel column 110 or via a base material or the like. Thereby, the construction of the board member 150 (fireproof coating of the steel column 110) and the interior construction of the wall and the like can be performed by the same contractor. Accordingly, the construction cost of the board member 150 is reduced as compared with a configuration in which the board member 150 is bonded and joined directly to the steel column 110 or via a base material or the like.

Further, in the four corners 102 where the end portions 150T in the width direction of the board member 150 shown in FIG. 4 are abutted with each other, the end portion 120YK in the strong axis direction K of one stud 120Y is replaced with the other stud 120X. The end portion 120XJ in the weak axis direction J is supported. Therefore, the buckling length of one stud 120Y with respect to the out-of-plane direction of one board member 150Y is suppressed. Thereby, the out-of-plane deformation of one board member 150Y at the corner 102 is suppressed.
Further, since the out-of-plane deformation of the other board member 150X at the corner 102 is supported by both the stud 120Y and the stud 120X, the out-of-plane deformation of the other board member 150X is suppressed.

  In this way, the desired out-of-plane rigidity of the one and the other board members 150 at the corner 102 is ensured without increasing the rigidity by increasing the thickness of the stud 120 or the like. Therefore, the desired out-of-plane rigidity of the board member 150 is ensured while suppressing an increase in the construction cost or reducing the construction cost.

  Further, since each stud 120 is disposed with the out-of-plane direction of each board member 150 as the strong axis direction K, the out-of-plane rigidity of each board member 150 is improved.

  Here, reinforced gypsum board and gypsum constituting gypsum board contain a large amount of crystal water, and when exposed to flames and heat, the water absorbs heat as it is released into the air as steam. Demonstrate the heat insulation effect.

  As described above, the board member 150 composed of the reinforced gypsum board and the gypsum board exhibits a heat resistance effect by evaporating the crystal water, but the temperature rises from the outer surface side of the board member 150, and thus evaporates from the crystal water on the outer surface side. To do. Therefore, the outer surface side contracts as the crystal water evaporates. Thereby, as shown by an imaginary line (two-dot broken line) in FIG. 4A, the board member 150 is deformed so that the end portion 150T is curved outward, and the end portions 150T are abutted against each other. May open.

  However, even if the corner portion 102 is opened, the two studs 120 arranged in the corner portion 102 protect (guard) the intrusion of flame and heat, and the steel column 110 is prevented from being directly heated. Further, both the stud 120Y and the stud 120X prevent the intrusion of flame and heat from the out-of-plane direction of the one board member 150Y due to the opening of the corner portion 102.

Thus, by applying the present invention, the fire resistance performance of the steel column 110 is improved while preventing an increase in the construction cost of the board member 150 due to the accuracy of the steel column 110.
In addition, without increasing the rigidity by increasing the thickness of the stud 120 or the like, in other words, while suppressing an increase in the construction cost or reducing the construction cost, the desired surface of the one and the other board members 150 in the corner portion 102. External rigidity can be ensured.

  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. The steel column 110 is surrounded by a board member 150 that serves both as a fireproof covering material and a finishing material, so that the cross section orthogonal to the axial direction surrounded by the board member 150 (horizontal cross section of the column 100) is finished. As a result, the effective area of the room can be increased.

  In addition, in this 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 longitudinal direction of the stud 120 may be in contact with the steel column 110. However, even if the spacer is sandwiched or contacted, the stud 120 is supported independently from the steel column 110.

Further, in the present embodiment, underlaid board 152 constituting the board member 150 is formed of a reinforced gypsum board, veneer board 154 has been consists of gypsum board, but is not limited thereto. A reinforced gypsum board may also be used for the upper board 154. In addition, fireproof performance is further improved by using a reinforced gypsum board for the upper board 154 as well.

<First modification>
As shown in FIG. 5, in the first modified example, the rock wool 160 is filled in the stud 120. Therefore, the stud 120 exhibits a high heat insulating effect. Therefore, the heat resistance performance when the part where the end portions 150T in the width direction of the board member 150 in the corner portion 102 are abutted with each other is improved.

  Note that a heat insulating member other than the rock wool 160 may be provided in the stud 120. For example, the stud 120 may be filled with a material such as mortar, glass wool, or gypsum board.

  Furthermore, the structure which covered the circumference | surroundings of the stud 120 with heat insulation members, such as glass wool and mortar, may be sufficient. In short, it is sufficient that a heat insulating member is provided on the stud 120 and the heat insulating effect of the stud 120 is improved.

<Second modification>
As shown in FIG. 6 (A), in the second modification, a frictional resistance reducing material made of a fluororesin or the like between the runner 130 and the ends 120U and 120L in the vertical direction (longitudinal direction) of the stud 120. 170 is sandwiched. In FIG. 6 (A), the plate thickness of the runner 130 and the stud 120 is shown thicker than the actual thickness for easy understanding. That is, the actual plate thickness of the runner 130 and the stud 120 is very thin compared to the plate thickness of the board member 150 and the board 155 (described later) indicated by imaginary lines.

With such a structure, the vibration of an earthquake or the like, the ends 120U of the runner 130 and studs 1 20, the creaking sound or the like generated by the rubbing and the 120L reduced. Note that squeak noise and the like are reduced even if an elastic body such as rubber is sandwiched instead of the frictional resistance reducing material 170. Further, it may be supported by a universal joint or the like.

  Further, as shown in FIGS. 6A and 6B, the flange 132 of the runner 130 is formed with a long hole 134 whose longitudinal direction is the vertical direction. Then, the end portions 120U and 120L of the stud 120 are attached to the runner 130 by screws 136 inserted through the long holes 134. That is, the end portions 120U and 120L of the stud 120 are supported without being restricted in the longitudinal direction.

  By adopting such a structure, the steel column 110 (see FIGS. 1 and 3) is axially extended by heat in the event of a fire or the like, so that even if the space between the slab 12 and the slab 14 spreads, 120 does not follow the long hole 134 minutes, that is, the stud 120 does not extend. Therefore, the malfunction by the stud 120 extending | stretching, for example, the opening of the horizontal joints 152S and 154S (refer FIG. 1, FIG. 3) of the board member 150 is suppressed.

  In addition, when the space | interval between the slab 12 and the slab 14 spreads, the space between the upper and lower ends of the board member 150 and the slabs 12 and 14 may open. Therefore, as shown by an imaginary line (a two-dot broken line) in FIG. 6A, the board member 150 is prevented from entering a direct fire even if the upper and lower ends of the board member 150 and the slabs 12 and 14 are opened. A flameproof board 155 may be arranged outside the frame.

  Further, the end portions 120U and 120L of the stud 120 may be supported without being constrained in the longitudinal direction by a configuration other than the long hole 134.

<Second embodiment>
The column which concerns on 2nd embodiment of this invention is demonstrated using FIG. The first embodiment has substantially the same structure except for the arrangement of the stud 120 and the groove width of the runner. Therefore, description of other structural parts is omitted. Moreover, the same code | symbol is attached | subjected to the member similar to 1st embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 7, each stud 120 is arranged with the out-of-plane direction of each board member 150 constituting the wall surface of the column 105 as the weak axis direction J (see FIG. 4B). Although not illustrated, the groove width of the runner is such that the weak axis direction J can be accommodated.

  The arrangement of the studs 120 at the four corners 102 formed by abutting the end portions 150T in the width direction of each board member 150 is, for example, a stud that supports one board member 150Y and the other board member 150X. The end 120YJ in the weak axis direction 120Y of 120Y and the end 120XK in the strong axis direction K of the stud 120X that supports the other board member 150X are arranged so as to contact or approach each other.

Next, functions and effects of the present embodiment will be described.
Similar to the first embodiment, this embodiment also achieves effects such as improving the fire resistance of the steel column 112 while preventing the construction cost of the board member 150 from increasing due to the accuracy of the steel column 112.

  Further, since the stud 120 is disposed with the out-of-plane direction of the board member 150 as the weak axis direction J, the finishing width of the cross section (horizontal cross section of the column 105) orthogonal to the axial direction surrounded by the board member 150 is further suppressed. It is done.

  In the present embodiment, the first modification and the second modification of the first embodiment can be applied.

<Third embodiment>
A column according to the third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member similar to 1st embodiment and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, in this embodiment, the steel column 112 is a steel pipe having a substantially rectangular horizontal cross section, and the horizontal cross section of the column 107 (the portion surrounded by the board member 150 constituting the wall surface of the column 107) is also used. It has a substantially rectangular shape.

  And the stud 120Y is arrange | positioned by making the out-of-plane direction of the board member 150Y which comprises a rectangular long side into the strong axis direction K (refer FIG. 4 (B)), and the stud 120X is a board member which comprises a rectangular short side. An out-of-plane direction of 150X is arranged as a weak axis direction J (see FIG. 4B).

  Since other structures are the same as those of the first embodiment and the second embodiment, description thereof is omitted.

Next, functions and effects of the present embodiment will be described.
Similar to the first embodiment and the second embodiment, in this embodiment as well, the fire performance of the steel column 112 is improved while preventing the construction cost of the board member 150 from increasing due to the accuracy of the steel column 112. Fulfills the effect.

  And since the stud 120Y which supports the board member 150Y which comprises the long side with small out-of-plane rigidity is arrange | positioned by using the out-of-plane direction as the strong axis direction K, the out-of-plane rigidity of the board member 150Y improves.

  Further, since the stud 120X that supports the board member 150X constituting the rectangular short side having a large out-of-plane rigidity is disposed with the out-of-plane direction as the weak axis direction J, the finishing width in the X direction of the column 105 can be suppressed. .

  In the present embodiment, the first modification and the second modification of the first embodiment can be applied.

<Others>
The present invention is not limited to the above embodiment.

  In the above-described embodiment, the board member 150 has a configuration in which the two boards of the lower board 152 and the upper board 154 are stacked in the out-of-plane direction, but is not limited thereto. A board member having a configuration in which three or more boards are stacked may be used. Alternatively, it may be composed of a single board.

  Further, in this embodiment, the inner underboard 152 and the outer upper board 154 constituting the board member 150 are made of gypsum board (more precisely, the underboard 152 is a fiber-reinforced reinforced gypsum board). However, 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. Further, the board member may be composed of a board (such as a decorative board) other than the fireproof board. Alternatively, when the board member is composed of a plurality of boards, the fireproof board and a board other than the fireproof board may be combined.

  Moreover, in the said embodiment, although the supporting member was a stud with a C-shaped cross section, it is not limited to this. Support members having other shapes may be used. For example, it may be a support member having a square shape, a circular shape (including an ellipse), a tubular shape, or an H-shaped cross section.

  Moreover, in the said embodiment, although the stud as a supporting member was supported by the runner provided in the slab as an example of structural members other than a steel column, it is not limited to this. Any support structure may be used. For example, a structure in which an angle such as an L-shaped cross section is provided in a structural member such as a slab or a beam, and a stud is fixed to this angle may be used.

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

  Moreover, members other than a support member may be arrange | positioned between the steel column and the board member. For example, a heat insulating material such as glass wool may be disposed between the steel column and the board member. In other words, a structure in which a heat insulating material such as glass wool is wound around the steel column and the outside of the heat insulating material is surrounded by a board member (fireproof coating) may be employed.

  Moreover, in the said embodiment, although the horizontal cross section of the pillar was substantially rectangular shape (substantially rectangular or substantially square), it is not limited to this, The polygonal shape more than a triangle and a pentagon may be sufficient. Alternatively, a shape in which a part or all of the sides are curved may be used.

  Moreover, in the said embodiment, the 1st support member which supports one and the other board member in all four corners of a pillar, and one board member are supported and it contacts or adjoins to a 1st support member. Although the 2nd said supporting member was arrange | positioned, it is not limited to this. It is only necessary that at least one of the corners is disposed with the first support member and the second support member in contact with or close to the first support member.

  The arrangement of the support members (studs) other than the corners may be any arrangement. For example, support members may be disposed only at the corners. Alternatively, the support members other than the corners may not be disposed with the vertical direction as the longitudinal direction, but may be disposed obliquely.

Moreover, in the said embodiment, although this invention was applied to the fireproof structure of the steel column which comprises a structure, it is not limited to this. The present invention can be applied to a fireproof structure of a steel member constituting a steel structure such as a steel concrete structure or a steel rebar structure.
For example, the present invention 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).
Or this invention is applicable also to the fireproof structure of a steel beam. Note that the structure of the steel beam is substantially the same as the structure of the steel column described in the above embodiment, which is inclined by 90 °, and the axial direction of the steel beam is a horizontal direction.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10 Structure 12 Slab (Structural member other than steel members constituting the structure)
14 Slab (Structural members other than steel members constituting the structure)
100 pillar 102 corner 105 pillar 107 pillar 110 steel pillar (steel member)
112 Steel columns (steel members)
120 Stud (support member)
120K Strong axial end 120S Weak axial end 120T End (longitudinal end)
130 Runner (Mounting member)
150 Board member 150T End (end in width direction)
152 Underlay board (board material)
154 Upper board (board member)
160 Glass wool (heat insulation member)
170 Friction resistance reducing material K Strong axis direction J Weak axis direction

Claims (6)

A plurality of board members surrounding the steel member constituting the structure with a space from the steel member;
A support member that is arranged between the steel member and the board member with the axial direction of the steel member as a longitudinal direction and is arranged at intervals in the width direction orthogonal to the axial direction, and supports the board member When,
Have
The support member has a cross-sectional shape having a strong axis direction and a weak axis direction, is disposed with the out-of-plane direction of the board member as a strong axis direction, and both longitudinal ends constitute the structure. While being supported by a structural member other than a steel member, a gap is formed between the steel member,
In the corner where the ends in the width direction of the board member are abutted,
A first support member in which one and the other board members are fixed and supported, and a second support member that supports the other board member without fixing and contacts the first support member are disposed. And
The strong axial direction end of the first support member and the weak axial direction end of the second support member are arranged in contact with each other,
Steel frame fireproof structure. A plurality of board members surrounding the steel member constituting the structure with a space from the steel member;
A support member that is arranged between the steel member and the board member with the axial direction of the steel member as a longitudinal direction and is arranged at intervals in the width direction orthogonal to the axial direction, and supports the board member When,
Have
The support member has a cross-sectional shape having a strong axis direction and a weak axis direction, the support member is disposed with the out-of-plane direction of the board member as a weak axis direction, and both longitudinal ends thereof are the structure. Is supported by a structural member other than the steel member, and a gap is formed between the steel member,
In the corner where the ends in the width direction of the board member are abutted,
A first support member in which one and the other board members are fixed and supported, and a second support member that supports the other board member without fixing and contacts the first support member are disposed. And
The weak axial direction end portion of the first support member and the strong axial direction end portion of the second support member are arranged in contact with each other,
Steel frame fireproof structure. The steel member is a steel column arranged with the vertical direction as the axial direction,
The support member is erected with the vertical direction as the longitudinal direction,
The fireproof structure of the steel member according to claim 1 or 2. The longitudinal end of the support member is attached to an attachment member provided in the structure,
Between the attachment member and the longitudinal end of the support member, a frictional resistance reducing material or an elastic member is sandwiched,
The fire-resistant structure of the steel member of any one of Claims 1-3. A heat insulating member is provided on at least one of the first support member and the second support member.
The fireproof structure of a steel member according to any one of claims 1 to 4. At least one end portion of the support member in the longitudinal direction is supported by the structure without being restrained in the longitudinal direction,
The fireproof structure of a steel member according to any one of claims 1 to 5.

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