JP6639831B2 - Building structure - Google Patents

Description

  The present invention relates to a fire-resistant building structure such as a balcony or a flat roof.

  Patent Literature 1 discloses a floor plate made of a semi-incombustible or more surface material such as a hard wood cement plate fixed above a structure, and a ceiling plate made of a surface material such as gypsum board fixed below the structure. A fire-resistant floor structure in which a thermally expandable fire-resistant sheet is disposed between the structure and the ceiling plate is disclosed.

  Further, in Patent Document 2, a connecting piece is provided on the surface of a cover piece, and a fixing piece is provided on the back surface of the cover piece to form a step mounting hardware, and a space opening downward between the cover piece and the fixing piece is provided. Provide the stairs mounting hardware on the beam so as to cover the side of the beam with a cover piece, fix the fixing piece to the beam, attach the stair mounting hardware to the beam, and attach the stair mounting hardware to the connecting piece of the staircase end. There is disclosed a stair mounting structure in which is fixed.

JP 2007-9676A JP-A-7-324449

  However, the technique of Patent Document 1 does not cover the upper flange of a steel beam as a structure with a fire-resistant coating material, and thus cannot obtain sufficient fire resistance. Further, the technique of Patent Document 2 has a disadvantage that workability is inferior because a wet refractory material is used.

  An object of the present invention is to provide a building structure excellent in fire resistance and workability in view of the above circumstances.

  In order to solve the above-mentioned problems, the building structure of the present invention is provided with a fire-resistant support plate provided on the side of a steel beam and provided on an upper flange of the steel beam, and a gap is provided on the upper flange. A gap forming member to be formed and a refractory material put in the gap are provided.

  According to the above configuration, since the upper flange of the steel beam can be covered with the fire-resistant material, good fire resistance can be obtained. Also, unlike the wet type, the structure is such that the steel beam is covered with the fire-resistant covering sheet, so that the construction is easy.

  The refractory material covers the upper surface of the upper flange at one end side portion inserted in the gap, and covers one side of the web of the steel beam, the other side of the lower flange and the web at an intermediate portion. Alternatively, a fire-resistant covering sheet may be provided so as to cover a side surface on the steel beam side of the fire-resistant support plate or a lower surface portion in the vicinity of the side surface at the other end portion. According to this, since the entire periphery of the steel beam can be covered with the fireproof, it is possible to obtain good fire resistance. Further, from the upper flange of the steel beam, through one side of the web, the lower flange, and the other side of the web, the side surface of the fire-resistant support plate on the steel beam side or the lower surface of the fire-resistant support plate near the side surface. Since the portion up to the portion is continuously covered with the fireproof covering sheet, the construction is further facilitated as compared with joining and covering several divided fireproof covering sheets.

  The gap forming member may project from the upper flange on a side opposite to a side on which the fire-resistant support plate is provided. According to this, when the member arranged on the upper surface is received by the gap forming member, the receiving area can be made larger than the area of the upper flange. Further, the refractory material (fireproof covering sheet) can be inserted from below the overhanging portion.

  The gap forming member includes a first member and a second member that are separate members formed to be long in the longitudinal direction of the steel beam, and the first member is an upper plate portion located above the upper flange. A mounting plate that is attached to the upper flange, a fixing plate that connects and fixes the mounting plate and the upper plate, and a support that supports one end of the second member. . According to this, since the first member and the second member are separate members, the individual objects are lightweight and easy to handle as compared with the case where they are integrally formed, and workability at a high place is improved.

  The other end of the second member may be fixed to a base of the wall member. According to this, there is an advantage that the thickness of the second member can be reduced by supporting the second member on the base of the wall member.

  A reinforcing plate portion for reinforcing the upper plate portion may be provided separately from the upper flange. According to this, it is possible to push the refractory material between the upper flange and the reinforcing plate portion without cutting the refractory material (the refractory coating sheet), thereby facilitating the construction of the refractory material. Become.

  The gap forming member includes an upper surface portion formed to be long in the longitudinal direction of the steel beam, a mounting plate portion attached to the upper flange, and a fixing plate portion for connecting and fixing the upper surface portion to the mounting plate portion. May be provided. According to this, it is possible to obtain an advantage that a product produced in a factory by integrating the upper surface portion, the mounting plate portion, and the fixing plate portion can be quickly installed on site.

  The upper surface portion includes a first plate portion closer to the fire-resistant support plate and a second plate portion farther from the fire-resistant support plate, and the first plate portion and the second plate portion are separated from each other. An opening may be formed. According to this, since the opening due to the separation is formed, the weight of the gap forming member can be reduced.

  A reinforcing plate portion for reinforcing the upper surface portion may be provided separately from the upper flange. According to this, it is possible to push the refractory material between the upper flange and the reinforcing plate portion without cutting the refractory material (the refractory coating sheet), thereby facilitating the construction of the refractory material. Become.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to make it the building structure excellent in fire resistance, and there exists an effect that it is excellent also in workability.

1 is a schematic perspective view showing a part of a balcony as a building structure according to an embodiment of the present invention. It is the schematic perspective view which showed the state which wound the refractory coating sheet in FIG. It is an outline sectional view showing a balcony as a building structure concerning an embodiment of the present invention. 2A and 2B are views showing a gap forming member used for the balcony of FIG. 1, wherein FIG. 1A is a plan view, FIG. 1B is a front view, FIG. 1C is a side view, and FIG. D) is a side view of the reinforcing member. It is an outline perspective view showing a part of flat roof structure as a building structure concerning other embodiments of the present invention. It is the schematic perspective view which showed the state which wound the refractory coating sheet in FIG. FIGS. 6A and 6B are views showing a gap forming member used in the building structure of FIG. 5, wherein FIG. 5A is a plan view, FIG. 5B is a front view, FIG. (D) is a side view of the reinforcing member. It is the figure which showed the clearance gap formation member of another form which can be utilized for the building structure of FIG. 5, (A) is a top view, (B) is a front view, (C) is a side view. is there. It is an explanatory view showing another example of winding of a fireproof covering sheet of a building structure according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIGS. 1, 2 and 3 show a floor set of balconies as an example of the building structure of this embodiment. The floor set includes a steel beam 1 made of H-shaped steel or the like serving as a balcony beam. The floor of this balcony is constructed by laying a concrete plate 2 such as an ALC (Autoclaved Lightweight aerated Concrete) plate as a fire-resistant support plate. The fire-resistant support plate has fire resistance as a whole, such as a mixture of non-fire-resistant members and fire-resistant members (for example, a non-fire-resistant support member covered with a fire-resistant member). Including those capable of supporting loads.

  In the above-mentioned floor group, the side 2a of the concrete slab 2 arranged at the outermost side is brought close to the house-side lateral edge of the upper flange 1a of the steel beam 1, and the concrete slab is placed on the upper flange 1a. 2 is not located. Also, in this example, a support fitting (not shown) is fixed to the web 1b of the steel beam 1 by welding or the like, and the lower face of the lower side surface of the concrete slab 2 is supported by the support fitting. In this example, the upper surface of the concrete slab 2 is located above the upper flange 1a, and the lower surface of the concrete slab 2 is located below the upper flange 1a.

  On the upper flange 1a of the steel beam 1, a gap forming member 3 that forms a gap on the upper flange 1a is provided. The gap forming member 3 projects on the side opposite to the side where the concrete slab 2 is provided, and the bottom surface of the gap forming member 3 is open. The gap forming member 3 can receive and support a member disposed on the upper surface thereof.

  As shown in FIG. 4, the gap forming member 3 includes a long upper surface portion 31 formed to be long in the longitudinal direction of the steel beam 1, a mounting plate portion 32 mounted on the upper flange 1 a, and the mounting plate portion 32. A fixing plate portion 33 for connecting and fixing the plate portion 32 to the upper surface portion 31 and a reinforcing plate portion 34 are provided. The upper surface portion 31, the mounting plate portion 32, the fixing plate portion 33, and the reinforcing plate portion 34 are each made of, for example, a steel plate having a thickness of about 1.6 mm, and are fixed to each other by welding. The gap forming member 3 has a length of, for example, about 910 mm, and a plurality of the gap forming members 3 are provided in the longitudinal direction of the steel beam 1.

  The upper surface portion 31 is located above and spaced apart from the upper flange 1a. The upper surface portion 31 includes a first plate portion 31a closer to the concrete plate 2 and a second plate portion 31b farther from the concrete plate 2, and the first plate portion 31a and the second plate portion 31b. The opening is formed by separating from the part 31b. The first plate portion 31a is bent downward and has a bent portion facing the side surface 2a, and this bent portion is also fixed to the fixed plate portion 33.

  The fixed plate portion 33 is formed by arranging a steel plate upright, and is provided near both ends of the gap forming member 3. The fixing plate 33 has a substantially square shape in which both the upper side and the lower side are horizontal sides. The first plate portion 31a and the second plate portion 31b are fixed to each other by the fixing plate portion 33, and the first plate portion 31a and the second plate portion 31b are connected and fixed to the mounting plate portion 32. You.

  The reinforcing plate portion 34 is formed by arranging a steel plate upright, and is provided at an intermediate position between the two fixed plate portions 33. The first plate portion 31a and the second plate portion 31b are fixed to each other also by the reinforcing plate portion. The upper side of the reinforcing plate portion 34 is a horizontal side, and the lower side is a substantially triangular shape that is farther away from the upper flange 1a as being farther from the side surface 2a of the concrete slab 2.

  The mounting plate 32 is fixed to the lower side of each fixing plate 33. The mounting plate 32 has two through holes for bolt insertion in the vertical direction. Also, a through hole for bolt insertion is formed in the upper flange 1a in the vertical direction. The mounting plate 32 is fixed to the upper flange 1a by screwing a nut to a bolt provided through the through hole for bolt insertion.

  The steel beam 1 is covered with a fireproof covering sheet 4. Specifically, the refractory coating sheet 4 covers the upper surface of the upper flange 1a at one end side portion inserted in the gap, and at one half of the web 1b of the steel beam 1 at the middle portion. The other side of the flange 1c and the web 1b is covered, and the other end portion covers the lower surface of the concrete plate 2 near the side surface 2a of the concrete plate 2. In addition, the fireproof covering sheet 4 is provided on the mounting plate portion 32 at the location where the mounting plate portion 32 is disposed. Further, according to such a winding method, the supporting metal for supporting the concrete slab 2 fixed to the web 1b of the steel beam 1 can be covered by the other end portion of the refractory covering sheet 4. it can.

  The fire-resistant covering sheet 4 is made of a fire-resistant and flexible sheet provided for protecting the steel beam 1 from the flame heat at the time of fire, for example, a sheet of heat-resistant rock wool, and can be wound around an object. is there. Further, the refractory covering sheet 4 can be fixed to the steel beam 1 by, for example, stud welding. Further, the other end portion covering the lower surface of the lower side of the side surface 2a of the concrete plate 2 can be fixed to the concrete plate 2 using, for example, screws.

  Further, for example, a mounting plate (not shown) is fixed by welding so as to extend between the edges of the upper flange 1a and the lower flange 1c, and the waist wall 51 of the balcony is fixed to this mounting plate by bolts or the like. Further, the fireproof covering sheet 4 is also wound around the indoor beam 52 which is the base side of the balcony. Further, on the base side of the balcony, outer wall panels 53 and 54 are provided, and an eave portion 55 is attached to the outer wall panel 54 from below the waist wall 51. Further, on the gap forming member 3, for example, a covering material 50 made of a plate-like refractory material (which may expand by heat at the time of fire) or the like is provided. Then, an inclined floor 56 is formed by applying a water gradient to the covering material 50 and the concrete slab 2.

  With the above configuration, the entire circumference of the steel beam 1 (excluding the side surface 2a of the concrete slab 2) can be covered with the fire-resistant covering sheet 4, so that the building structure has excellent fire resistance. Is possible. Further, unlike the wet type, the structure is such that the steel beam 1 is covered with the fire-resistant covering sheet 4, so that the construction is easy. Further, the fire-resistant covering sheet extends from the upper flange 1a of the steel beam 1 to one lower side of the side face 2a of the concrete slab 2 through one side of the web 1b, the lower flange 1c, and the other side of the web 1b. Since the coating is continuously performed in step 4, the construction is further facilitated as compared with the case where several divided fire-resistant coating sheets are connected and coated. In addition, in the longitudinal direction of the steel beam 1, not one but a plurality of refractory covering sheets 4 are provided.

  When the gap forming member 3 projects on the side opposite to the side where the concrete slab 2 is provided, when the gap forming member 3 receives a member (such as the covering material 50) disposed on the upper surface thereof, The receiving area can be made larger than the area of the upper flange 1a.

  The gap forming member 3 connects the upper surface portion 31 formed to be long in the longitudinal direction of the steel beam 1, the mounting plate portion 32 attached to the upper flange 1a, and the mounting plate portion 32 and the upper surface portion 31. With the fixing plate portion 33 to be fixed, there is an advantage that the top surface portion 31, the mounting plate portion 32, and the fixing plate portion 33 are integrated and the one produced at the factory can be quickly installed on site.

  In particular, when the upper surface portion 31, the mounting plate portion 32, and the fixed plate portion 33 are fixed by welding, the gap forming member 3 can be manufactured at low cost. The structure is not limited to such a structure, and the fixing plate portion 33 and the like may be made of a refractory member such as a brick. In this case, the gap forming member 3 and the like cannot be fixed by welding, but the fire resistance can be improved by making the fixing plate portion 33 a fire-resistant member.

  The upper surface portion 31 includes a first plate portion 31a closer to the concrete plate 2 and a second plate portion 31b farther from the concrete plate 2, and the first plate portion 31a and the second plate portion 31b. When the opening is formed so as to be separated, the gap forming member 3 can be reduced in weight because the opening is formed by the separation.

  When the reinforcing plate portion 34 for reinforcing the upper surface portion 31 is provided at a distance from the upper flange 1a, even if the refractory covering sheet 4 is not cut, the upper flange portion 1a and the reinforcing plate portion 34 can be connected to each other. The fire-resistant covering sheet 4 can be pushed in between, and the construction of the fire-resistant covering sheet 4 becomes easy. Further, when the reinforcing plate portion 34 has a triangle whose lower side is farther away from the upper flange 1a as the lower side is farther from the side surface 2a of the concrete slab 2, the entrance side of the pushing of the fireproof covering sheet 4 is wider, The refractory coating sheet 4 can be pushed in smoothly.

  5 and 6 show a flat roof structure as an example of a building structure according to another embodiment. This flat roof structure is provided with a steel beam 1 made of an H-beam or the like that serves as a building beam. The concrete plate 2 is laid as a roof material.

  In the above-mentioned flat roof structure, the side surface 2a of the concrete slab 2 arranged on the outermost side is located on the lateral side edge of the upper flange 1a of the steel beam 1 on the outdoor side. A support fitting (not shown) is fixed to the web 1b of the steel beam 1 by welding or the like, and the lower face of the lower side surface 2a of the concrete slab 2 is supported by the support fitting.

  On the upper flange 1a of the steel beam 1, a gap forming member 6 for forming a gap on the upper flange 1a is provided. The gap forming member 6 projects on the side opposite to the side where the concrete slab 2 is provided, and the bottom surface of the gap forming member 6 is open.

  The gap forming member 6 includes a first member 61 and a second member 62 which are separate members formed to be long in the longitudinal direction of the steel beam 1.

  The first member 61 includes an upper plate portion 61a located above the upper flange 1a, a mounting plate portion 63 attached to the upper flange 1a, and connecting and fixing the mounting plate portion 63 and the upper plate portion 61a. And a supporting portion 65 for supporting one end of the second member 62, and a reinforcing plate portion 66.

  As shown in FIG. 7, the upper plate portion 61a, the mounting plate portion 63, the fixed plate portion 64, the support portion 65, and the reinforcing plate portion 66 that constitute the first member 61 each have a thickness of, for example, about 1.6 mm. Made of steel plates and fixed to each other by welding. The length of the first member 61 is, for example, about 910 mm, and a plurality of the first members 61 are provided in the longitudinal direction of the steel beam 1.

  The upper plate portion 61a has a hook shape in cross section including a horizontal piece and a vertical piece. The vertical piece portion is bent downward and faces the side surface 2a of the concrete slab 2, so that the number of surface portions in contact with the fixed plate portion 64 and the reinforcing plate portion 66 is increased. Further, four support portions 65 are provided on the horizontal piece of the upper plate portion 61a. A part of the support part 65 is fixed to the lower surface of the horizontal piece part of the upper plate part 61a by welding or the like, and the other part protrudes outside.

  The first member 61 includes the mounting plate 63 and the fixed plate 64 near both ends thereof. Further, one mounting plate 63 and one fixed plate 64 are formed of one steel plate member having a substantially L-shaped cross section.

  The reinforcing plate portion 66 is provided at an intermediate position between the two fixed plate portions 64. The reinforcing plate 66 reinforces the upper plate 61a. The reinforcing plate 66 has an upper side which is a horizontal side, and a lower side which is a substantially triangular shape which is farther away from the upper flange 1a as being farther from the side surface 2a of the concrete slab 2.

  The mounting plate 63 is provided on the lower side of each fixing plate 64. A single through hole for bolt insertion is formed in the mounting plate 63 in the vertical direction. Also, a through hole for bolt insertion is formed in the upper flange 1a in the vertical direction. The mounting plate 63 is fixed to the upper flange 1a by screwing a nut to a bolt provided through the through hole for bolt insertion.

  The second member 62 has a hook shape in cross section including a horizontal piece 62a and a rising portion 62b. The indoor side end (one end side) of the horizontal piece 62 a is placed on a support 65 provided on the first member 61. On the other hand, the rising portion 62b (the other end side) protrudes more outward than the outdoor side edge of the steel beam 1, and is fixed to, for example, a foundation 71a (plywood or the like) of the outer wall panel 71 with screws. A through hole through which the screw is inserted is formed in advance in the rising portion 62b. Further, in this embodiment, the second member 62 is made of, for example, a steel plate coated with vinyl chloride and has a length of about 2000 mm. One second member 62 is provided for two first members 61. Is provided. In addition. A non-combustible waterproof sheet may be attached to the base 71a of the outer wall panel 71, and the rising portion 62b may be provided in contact with the waterproof sheet.

  As described above, when the first member 61 and the second member 62 are separate members, individual objects are lighter and easier to handle as compared with the case where they are integrated, and workability at high places is improved. .

  Further, when the other end side of the second member 62 is fixed to the base of the wall member (the base 71a of the outer wall panel 71, etc.), the second member 62 is compared with a structure in which the second member 62 itself supports the member. Of the present invention can be reduced.

  When the reinforcing plate portion 66 for reinforcing the upper plate portion 61a is provided at a distance from the upper flange 1a, the upper flange 1a and the reinforcing plate portion 66 can be formed without cutting the fireproof covering sheet 4. The fire-resistant covering sheet 4 can be pushed in between, and the construction of the fire-resistant covering sheet 4 becomes easy. Further, if the reinforcing plate portion 66 has a triangle whose lower side is farther away from the upper flange 1a as the lower side is farther from the side surface 2a of the concrete slab 2, the entrance side of the pushing of the fireproof covering sheet 4 becomes wider. In addition, the refractory coating sheet 4 can be pushed in smoothly.

  The first member 61 may have a form as shown in FIGS. 8A, 8B, and 8C. In this embodiment, the upper plate 61a has a substantially flat cross section, and the mounting plate 63 is formed integrally with the upper plate 61a by bending. A single through hole for bolt insertion is formed in the mounting plate 63 in the vertical direction. The fixed plate portion 64 is also formed integrally with the mounting plate portion 63 and the upper plate portion 61a by bending. Further, the support portion 65 is also formed integrally with the upper plate portion 61a. The reinforcing plate portion 66 has a U-shaped cross section, is fixed to the back side of the upper plate portion 61a by welding or the like at an intermediate position between the two fixed plate portions 64, and is separated from the upper flange 1a. Not. The amount of downward protrusion of the reinforcing plate 66 is the same as the amount of downward protrusion of the fixed plate 64. When the first member 61 shown in FIG. 8 is used, in order to insert the refractory covering sheet 4 between each fixed plate portion 64 and the reinforcing plate portion 66 and in the reinforcing plate portion 66, The refractory coating sheet 4 is cut.

  Further, in the above example, the refractory coating sheet 4 has one end portion thereof inserted into the gap between the gap forming members 3 and 6 to cover the upper surface of the upper flange 1a, and the steel beam at an intermediate position. 1, one side of the web 1b, the lower flange 1c, and the other side of the web 1b were covered, and the lower surface portion of the concrete plate 2 near the side surface 2a of the concrete plate 2 was covered at the other end portion. Not limited to this.

  For example, as shown in FIG. 9, the side surface 2 a of the concrete slab 2 may be covered with the other end side portion of the fireproof covering sheet 4. In the place where the support metal for supporting the concrete plate 2 is provided on the web 1b of the steel beam 1, the concrete plate near the side surface 2a of the concrete plate 2 is provided at the other end of the fire-resistant covering sheet 4. It is preferable to cover the lower surface of the second. Note that such trouble does not occur in the previous embodiments such as FIGS.

  Further, the fire-resistant covering sheet 4 is shown as a fire-resistant material, but the fire-resistant material is not limited to a sheet-like material or a material having flexibility. Further, the steel beam 1 may be covered with a plurality of types of refractory materials having different characteristics.

  The embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range as the present invention or within an equivalent range.

1: steel beam 1a: upper flange 1b: web 1c: lower flange 2: concrete plate (fire resistant support plate)
2a: side surface 3: gap forming member 4: fireproof covering sheet (fireproof material)
6: gap forming member 31: upper surface portion 31a: first plate portion 31b: second plate portion 32: mounting plate portion 33: fixed plate portion 34: reinforcing plate portion 50: covering material 51: waist wall 52: indoor beam 53 : Outer wall panel 54: Outer wall panel 55: Eave sky part 56: Inclined floor 61: First member 61 a: Upper plate part 62: Second member 62 a: Horizontal piece part 62 b: Start-up part 63: Mounting plate part 64: Fixed plate Part 65: Support part 66: Reinforcement plate part 71: Outer wall panel 71a: Base

Claims (9)

A fire-resistant support plate provided on the side of the steel beam, a gap forming member attached to the upper flange of the steel beam, forming a gap on the upper flange and supporting a member arranged on the upper surface ; And a refractory material placed in the gap.   2. The building structure according to claim 1, wherein the refractory material covers an upper surface of the upper flange at one end portion provided in the gap, and one side of the web of the steel beam at an intermediate position. A fire-resistant covering sheet provided to cover the other side of the lower flange and the web, and to cover the side surface on the steel beam side of the fire-resistant supporting plate or the lower surface portion near the side surface at the other end portion. A building structure characterized by the following:   3. The building structure according to claim 1, wherein the gap forming member projects from the upper flange on a side opposite to a side on which the fire-resistant support plate is provided. 4.   In the building structure according to any one of claims 1 to 3, the gap forming member includes a first member and a second member that are separate members formed to be long in a longitudinal direction of the steel beam. The first member includes an upper plate portion located above the upper flange, a mounting plate portion attached to the upper flange, and a fixing plate portion connecting and fixing the mounting plate portion and the upper plate portion. And a support portion for supporting one end of the second member.   The building structure according to claim 4, wherein the other end of the second member is fixed to a base of a wall member.   The building structure according to claim 4 or 5, wherein a reinforcing plate portion for reinforcing the upper plate portion is provided apart from the upper flange. The building structure according to any one of claims 1 to 3, wherein the gap forming member includes an upper surface portion formed to be long in a longitudinal direction of the steel beam, and a mounting plate portion attached to the upper flange. And a fixing plate portion for connecting and fixing the upper surface portion to the mounting plate portion.   8. The building structure according to claim 7, wherein the upper surface portion includes a first plate portion closer to the refractory support plate and a second plate portion far from the refractory support plate, and A building structure, wherein an opening is formed by separating a plate portion and a second plate portion.   9. The building structure according to claim 7, wherein a reinforcing plate for reinforcing the upper surface is provided at a distance from the upper flange. 10.

Images