JP2015218461A - Fire-resisting frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resisting frame structure that secures fire resistance of a joint by concealing the joint between steel members.SOLUTION: A fire-resisting frame 10 includes: a first steel member 20; a second steel member 22 that is joined to the first member 20; and a refractory exterior panel 76 that surrounds the first member 20 and that covers a joint 60 between the first and second members 20 and 22.

Description

  The present invention relates to a refractory frame structure configured at a joint between steel members.

  There is a column beam frame constructed by joining a steel beam member to a steel column member. For example, Patent Literature 1 discloses a column beam frame configured by welding a flange of a beam steel frame to a flange of a column steel frame.

  However, in such a column beam frame, after joining the beam member to the column member, the joint portion between the column member and the beam member must be subjected to fireproofing treatment by spraying wet fireproof coating or the like. In addition, in a building where such a column beam frame is provided so as to be exposed to the outside, the aesthetic appearance of the portion subjected to the fireproofing process is impaired.

JP-A-8-311988

  This invention considers the fact which concerns, hides the junction part of steel members, and makes it a subject to ensure the fire resistance of this junction part.

  The invention of the first aspect includes a first member made of steel, a second member made of steel joined to the first member, and a joint between the first member and the second member while surrounding the first member. A fireproof frame structure having a fireproof exterior panel that covers the frame.

  In the first aspect of the invention, it is possible to ensure the fire resistance of the joint portion between the first member and the second member by surrounding the first member with the fireproof exterior panel and covering the joint portion between the first member and the second member. it can. That is, the joint portion between the first member and the second member can be concealed by the fireproof exterior panel to ensure the fire resistance of the joint portion.

  For example, in a building provided such that the joint portion between the first member and the second member is exposed to the outdoors, the joint portion becomes exposed, and the beauty is impaired. Further, in the case where a fireproof treatment such as spraying of a wet fireproof coating is performed in order to ensure the fire resistance of the joint portion, the aesthetic appearance is impaired by the fireproof coating.

  On the other hand, in the fire-resistant frame structure according to the first aspect, it is not necessary to perform a fire-proof treatment by spraying wet fire-resistant coating or the like on the joint between the first member and the second member, and the first member and the second member. Since the joint portion is hidden by the fireproof exterior panel, it is possible to prevent the aesthetic appearance of the joint portion between the first member and the second member from being impaired.

  According to a second aspect of the present invention, in the fire-resistant frame structure of the first aspect, the second member is provided at the end of the H-shaped steel, concrete filled between the flanges of the H-shaped steel, and the H-shaped steel. And a joining end portion that is joined to the first member and is not filled with the concrete between the flanges.

  In the invention of the second aspect, the fireproof exterior panel surrounding the first member ensures the fire resistance of the first member and the joint between the first member and the second member, and the concrete is filled between the flanges of the H-shaped steel. Since the fire resistance of the second member is ensured by the endothermic effect, a fire-resistant frame structure having fire resistance can be constructed.

  Moreover, since the fire resistance of the second member is ensured by the heat absorption effect of the concrete filled between the flanges, the second member does not need to be subjected to a fire resistance treatment such as spraying a wet fireproof coating.

  Furthermore, since the fireproof exterior panel surrounds the first member and covers the joint portion between the first member and the second member, the fire resistance of the joint portion between the first member and the second member can be ensured. After joining the second member to the member, the joint end portion of the second member is filled with concrete or grout, or the joint end portion of the second member or the joint portion of the first member and the second member is coated with a wet fireproof coating. It is not necessary to perform fireproofing such as spraying.

  Moreover, a fire-resistant frame structure can be constructed efficiently without performing any other fire-resistant treatment by simply performing the joining work of the first member and the second member and the attaching work of the fire-resistant exterior panel to the first member. .

  Since this invention set it as the said structure, it can hide the junction part of steel members, and can ensure the fire resistance of this junction part.

It is a perspective view showing a structure concerning an embodiment of the present invention. It is a top view which shows the structure concerning embodiment of this invention. It is a perspective view which shows the fireproof frame structure which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a plane sectional view showing the attachment method of the fireproof exterior panel to the pillar concerning the embodiment of the present invention. It is side sectional drawing which shows the variation of the joining method of the beam to the pillar which concerns on embodiment of this invention. It is side sectional drawing which shows the variation of the fireproof frame structure which concerns on embodiment of this invention. It is side sectional drawing which shows the variation of the fireproof frame structure which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, the fireproof frame structure according to the embodiment of the present invention will be described.

  The perspective view of FIG. 1 and the plan view of FIG. 2 show a structure 12 as a frame structure that constitutes a building such as an apartment house having the fireproof frame structure 10 of the present embodiment. The structure 12 is erected on the foundation 14 and placed on the foundation 14 so as to be opposed to each other, and the structure 12 is erected on the foundation 14 adjacent to the outer construction 16, and a plurality of the structures 12 are arranged between the pair of outer constructions 16. The inner frame 18 is configured. Adjacent inner frames 18 are arranged to face each other. Further, the inner frame 18 is arranged so that the extended surface of the surface is substantially orthogonal to the surface of the outer frame 16 in plan view.

  The outer frame 16 is a column beam frame composed of a steel column 20 as a first member and a steel beam 22 as a second member, and the inner frame 18 includes a steel column 24, It is a column beam frame composed of steel beams 26. The outer frame 16 and the inner frame 18 are between the column 20 of the outer frame 16 and the column 24 of the inner frame 18 (the column 24 arranged closest to the outer frame 16 among the columns 24 constituting the inner frame 18). Are connected by a beam 28 erected.

  As shown in FIG. 4, which is a perspective view of FIG. 3 and a cross-sectional view taken along the line AA of FIG. 3, the beam 22 includes an H-section steel 36 having an upper flange 30, a web 32, and a lower flange 34, And a concrete V filled between the lower flange 34 and a joining end 38 provided at the end of the H-shaped steel 36 and joined to the column 20. That is, the beam 22 constitutes a so-called concrete-filled H-shaped steel beam.

  As shown in FIG. 4, the concrete V is not filled between the upper flange 30 and the lower flange 34 in the joint end portion 38. Thus, a joining space S in which a gusset plate 40 described later is accommodated is formed between the upper flange 30 and the lower flange 34.

  The column 20 is configured by connecting a plurality of column members 50 made of H-shaped steel having a flange 44, a web 46, and a flange 48 in the vertical direction. The column members 50 arranged above and below are joined together by joining the ends of the column members 50 by bolt joining using splice plates 52 and 54, bolts 56, and nuts 58. In the following description, a portion where the end portions of the column member 50 are joined together including the splice plates 52 and 54, the bolt 56, and the nut 58 is referred to as a joint portion 60.

  4 and FIG. 5 which is a BB cross-sectional view of FIG. 4, the beam 22 is provided on the gusset plate 40 provided to protrude from the flange 44 of the column member 50 (column 20), with a bolt 62 and a nut. 64, the ends of the upper flange 30, the web 32, and the lower flange 34 of the beam 22 are welded to the flange 44 of the column member 50 after being temporarily fixed to the column member 50 by joining the web 32 of the beam 22 with 64. Are joined to the column member 50. In the following description, a column including a welded portion joining the upper flange 30, the web 32, and the lower flange 34 of the beam 22 to the flange 44 of the column member 50, a gusset plate 40, a bolt 62, and a nut 64, A portion where the beam 22 is bonded to 20 is referred to as a bonding portion 78.

  At this time, the joining space S formed at the joining end portion 38 of the beam 22 accommodates the gusset plate 40 and bolts 62 and nuts 64 for fixing the web 32 to the gusset plate 40. Further, by using the joining space S, the bolt 62 is tightened and the ends of the upper flange 30, the web 32, and the lower flange 34 of the beam 22 are welded to the flange 44 of the column member 50.

  The surface of the pillar 20 (column member 50) and the H-shaped steel 36 constituting the beam 22 is subjected to a rust prevention treatment by hot dip galvanization or application of a rust-preventing paint.

  As shown in FIG. 3, the end of the floor slab 68 is supported on the beam 28. In the floor slab 68, a precast composite floor slab 66, which is a ready-made member formed by placing reinforced concrete on a steel plate, is arranged with the beam 28 supporting an end, and the top concrete U is placed on the precast composite floor slab 66. It is formed by hitting the site.

  The precast composite floor slab 66 is arranged such that the longitudinal direction 70 of the precast composite floor slab 66, which is the direction in which force flows in the precast composite floor slab 66, and the beam length direction of the beam 22 are parallel in plan view. ing.

  Thereby, the stress applied to the beam 22 from the floor slab 68 is reduced. In addition, since the stress ratio can be reduced, the fire resistance of the beam 22 can be improved (for example, the fire resistance verification (Route C) defined in the Ministry of Construction Notification No. 1433 (2000)). Can meet the requirements of a 2-hour fireproof building).

  The construction procedure of the beam 22 and the floor slab 68 is as follows. First, concrete is formed between the lower flange 34 and the upper flange 30 of the H-shaped steel 36 constituting the beam 22 in a production yard in the field or a factory outside the field. V is filled, and the precast beam member 72 is manufactured. At this time, on the left and right sides of the web 32 of the H-shaped steel 36, only the substantially upper half between the lower flange 34 and the upper flange 30 is filled with the concrete V, and the concrete V is filled on the lower flange 34. A post-striking part 74 is formed to be a space that is not present.

  Next, after the beam member 72 is joined to the column 20 (column member 50) to construct the beam 22, a precast composite floor slab 66 is installed, and the top concrete U is hit on the spot on the precast composite floor slab 66. At the same time, a part of the top concrete U is poured into the post-placed portion 74 of the beam member 72 and cured to form the floor slab 68 integrated with the beam 22. Accordingly, the floor slab 68 is provided at the lower end portion of the beam 22 and constitutes a so-called reverse beam.

  As shown in FIGS. 3 to 5, the fire-resistant frame structure 10 includes a column 20, a beam 22, and a fire-resistant exterior panel 76. The fireproof exterior panel 76 is made of a lightweight cellular concrete plate, surrounds the column 20 and covers the junction (joint portion 78) between the column 20 and the beam 22. As shown in the plane sectional view of FIG. 6, the fireproof exterior panel 76 is fixed to the lightweight section steel 82 attached to the column member 50 by welding or the like with screws 84 or the like. The fireproof exterior panel 76 surrounds the column 20, thereby surrounding the joint 60 that joins the column members 50 to each other. That is, the joint 60 that joins the column members 50 to each other is covered with the fireproof exterior panel 76.

  Next, the operation and effect of the fireproof frame structure according to the embodiment of the present invention will be described.

  In the fireproof frame structure 10 of the present embodiment, as shown in FIGS. 3 to 5, the pillar 20 is surrounded by the fireproof exterior panel 76 and the joint portion 78 between the pillar 20 and the beam 22 is covered, thereby joining the pillar 20 and the beam 22. The fire resistance of the part 78 can be ensured. That is, the joint portion between the column 20 and the beam 22 can be hidden by the fireproof exterior panel 76 to ensure the fire resistance of the joint portion.

  For example, in a building provided such that a joint between a pillar made of H-shaped steel and a beam is exposed to the outdoors, the joint is exposed, and the aesthetics are impaired. In addition, in order to ensure fire resistance, the aesthetic appearance is impaired by this fire-resistant coating when the joint is subjected to a fire-proof treatment such as by spraying a wet fire-resistant coating.

  On the other hand, in the refractory frame structure 10 of the present embodiment, it is not necessary to perform a fireproofing process by spraying wet fireproof coating on the joint 78 between the column 20 and the beam 22, and the junction between the column 20 and the beam 22 is performed. Since the portion 78 is hidden by the fireproof exterior panel 76, it is possible to prevent the aesthetic appearance of the joint portion 78 between the column 20 and the beam 22 from being impaired.

  Further, by covering the joint portion 78 between the column 20 and the beam 22 with the fireproof exterior panel 76, it is possible to prevent the joint portion 78 between the column 20 and the beam 22 from being deteriorated. Further, by covering the joint portion 78 of the column 20 and the beam 22 with the fireproof exterior panel 76, the welded portion joining the upper flange 30, the web 32, and the lower flange 34 of the beam 22 to the flange 44 of the column member 50. Rust generation can be suppressed, so it is possible to prevent the occurrence of rust on this weld with normal rust prevention coating, which is inferior to rust prevention treatment such as hot dip galvanization at factories. .

  Furthermore, in the fireproof frame structure 10 of the present embodiment, the joint 60 joining the column members 50 is surrounded by the fireproof exterior panel 76, and the joint 60 is covered with the fireproof exterior panel 76. While ensuring the fire resistance of the junction part 60, deterioration can be prevented and it can prevent that the beauty | look of the junction part 60 is impaired.

  Further, in the fireproof frame structure 10 of the present embodiment, the fireproof exterior panel 76 surrounding the column 20 ensures the fire resistance of the column 20 and the joint portion 78 between the column 20 and the beam 22, and the upper flange 30 and the bottom of the beam 22 are secured. Since the fire resistance of the beam 22 is ensured by the endothermic effect of the concrete V and the top concrete U filled between the flanges 34, the fire resistant frame structure 10 having fire resistance can be constructed.

  Further, since the beam 22 has fire resistance due to the heat absorption effect of the concrete V and the top concrete U filled between the upper flange 30 and the lower flange 34, fire resistance such as spraying wet fireproof coating on the beam 22 is provided. No processing is required.

  Further, in the fireproof frame structure 10 of the present embodiment, the fireproof exterior panel 76 surrounds the pillar 20 and covers the joint 78 between the pillar 20 and the beam 22, thereby ensuring the fire resistance of the joint 78 between the pillar 20 and the beam 22. Therefore, after joining the beam member 72 to the column 20, the joining space S of the joining end portion 38 of the beam 22 is filled with post-cast concrete or grout, or the joining end portion 38 of the beam 22 or the column 20 is filled. It is not necessary to perform a fireproofing process such as spraying a wet fireproof coating on the joint 78 of the beam 22.

  For example, when the post-cast concrete is to be filled in the joint space S of the joint end portion 38 of the beam 22, temporary equipment such as a formwork and a scaffold and a bar arrangement work are required, and the concrete to the joint space S is required. Since the placement is a complicated operation, it is effective to eliminate the need for filling the post-cast concrete into the joining space S.

  Furthermore, in the fireproof frame structure 10 of the present embodiment, it is possible to efficiently perform fireproofing without performing any other fireproofing treatment by simply performing the joining work of the pillar 20 and the beam 22 and the attaching work of the fireproof exterior panel 76 to the pillar 20. A frame structure 10 can be constructed.

  Moreover, in the fire-resistant frame structure 10 of this embodiment, since the column member and the beam member, and column members can be joined while ensuring the fire resistance to the joint portion, the fire-resistant frame structure 10 of the present embodiment is provided. By using it, a high-rise building can be constructed.

  The embodiment of the present invention has been described above.

  In the present embodiment, an example in which the fireproof exterior panel 76 is configured by a lightweight cellular concrete plate is shown. However, the fireproof exterior panel 76 surrounds the pillar 20, thereby connecting the pillar 20, the joint portion 78 between the pillar 20 and the beam 22. As long as the fire resistance of the joint 60 between the column members 50 can be ensured. For example, a fire resistant exterior panel 76 may be formed by attaching an exterior material such as a metal panel to the surface of a fire resistant material such as a calcium oxalate plate.

  In the present embodiment, after the beam 22 is temporarily fixed to the column member 50 by bolting using the gusset plate 40, the upper flange 30, the web 32, and the lower flange of the beam 22 are welded to the flange 44 of the column member 50 by welding. Although the example in which the end portions of 34 are joined is shown, the beam 22 is placed at a predetermined position by another method without temporarily fixing the beam 22 by bolt joining using the gusset plate 40, and then the column is welded. The ends of the upper flange 30, the web 32, and the lower flange 34 of the beam 22 may be joined to the flange 44 of the member 50.

  Furthermore, the beam 22 may be joined to the column member 50 by another method. For example, the beam 22 may be permanently fixed to the column member 50 by bolting using the gusset plate 40, or as shown in the side sectional view of FIG. The beam 22 may be joined to the column member 50 by bolt joining using the member 86.

  In the present embodiment, an example is shown in which the floor slab 68 is formed by hitting the top concrete U on the precast synthetic floor slab 66, but the floor slab 68 may be formed by other methods. For example, the floor slab may be formed by placing top concrete on a half precast PC floor slab, or may be formed by in-situ concrete without using a precast floor slab.

  Further, the floor slab 68 has the precast composite floor slab 66 disposed so that the direction in which the force flows in the precast composite floor slab 66 and the beam length direction of the beam 22 are orthogonal to each other in plan view. May be supported.

  Further, in the present embodiment, an example in which the first member is the column 20 and the second member is the beam 22 is shown, but the first member and the second member may be other members. For example, the first member may be a beam, the second member may be a column, the first member may be a beam, and the second member may be a beam.

  In the side sectional view of FIG. 8, the first member is a beam 88 made of H-shaped steel, and the second member is a pillar 90, 92 made of H-shaped steel and filled with concrete V between the flanges. 110 examples are shown. The bottom surface of the beam 88 is joined to the upper end portion of the column 90 and the lower end portion of the column 92 is joined to the upper surface of the beam 88 to constitute a beam-through column beam structure 94. A fireproof exterior panel 76 surrounding the beam 88 covers the joints 96, 98 of the beam 88 and the columns 90, 92.

  In the side sectional view of FIG. 9, the first member is a beam 100 made of H-shaped steel, and the second member is a beam 102 made of H-shaped steel and filled with concrete V between the flanges. An example is shown. The beam 102 is joined to the beam 100 by bolt joining using the gusset plate 104 provided on the beam 100. A fireproof exterior panel 76 surrounding the beam 100 covers the joint 108 between the beam 100 and the beam 102.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10, 110, 112 Fireproof frame structure 20 Column (first member)
22, 102 Beam (second member)
36 H-shaped steel 38 Joint end 76 Fireproof exterior panels 78, 96, 98, 108 Joint 88, 100 Beam (first member)
90, 92 Pillar (second member)
V concrete

Claims (2)

A first steel member;
A second steel member joined to the first member;
A fireproof exterior panel that surrounds the first member and covers a joint between the first member and the second member;
Fireproof frame structure with The second member is
H-section steel,
Concrete filled between the flanges of the H-shaped steel;
A joint end provided at an end of the H-shaped steel and joined to the first member, the concrete not filled between flanges;
The fireproof frame structure according to claim 1, wherein: