JP6734086B2 - Construction method for work floors in building fireproof structures and blowout areas - Google Patents

Description

The present invention relates to a building fireproof structure in which building components are covered with a fireproof covering material, and a work floor installation method for a building blowout part.

Patent Document 1 discloses a beam-outer wall connection structure in which an outer wall plate can be attached to a beam only from the outer wall side without damaging the fireproof coating material.

By the way, a fire-resistant covering material is coated on the steel beam forming the peripheral part of the building blow-out portion, and a work floor is temporarily installed in the building blow-out portion using the steel-frame beam coated with such a fire-proof covering material. .. Even in such a temporary construction of the work floor, it is required that the above-mentioned fireproof coating material does not have a defect.

JP, 2009-127268, A

However, in the case where a work floor is temporarily installed in the building blow-out section, if a support metal temporarily supporting this work floor is detachably attached to the steel beam, when the support metal is attached or the support metal is At the time of removal, a defect may occur in the fireproof coating material that covers the steel beam, and in this case, there is a problem that a separate worker and time are required to repair the defect. Further, the technique disclosed in Patent Document 1 cannot prevent damage to the fire-resistant coating material in the above case.

In view of the above circumstances, the present invention aims to reduce the occurrence of defects in the fire-resistant covering material due to members that are detachably provided in a building fire-resistant structure in which building components are covered with the fire-resistant covering material. To do.

In order to solve the above problems, the building fireproof structure of the present invention is a building fireproof structure in which a second member is detachably attached to a first member of a building which is at least partially covered with a fireproof covering material. Then, the vertical plate portions provided on each of the first member and the second member are overlapped and fixed to each other so that the second member is attached to the first member, and the vertical plate portions are attached to each other. A vertical cut is formed in the refractory coating material at the overlapping position.

In the above structure, the horizontal thickness of the overlapping portion of the vertical plate portions is only the sum of the thicknesses of the two plates and can be made relatively thin, so that the fire-resistant coating material is formed. By widening the cut, it is possible to perform the fireproof coating on the portion where the vertical plate portions are overlapped with each other, without causing a defect in the fireproof coating material. Then, when removing the second member, a tool can be inserted from the notch to release the fixed state between the vertical plate portions. When the second member is removed, the vertical plate portions do not overlap each other, and a gap is formed between the vertical plate portion of the first member in the cut, but the fireproof covering material around the cut is formed. It is possible to close the gap by pulling. Therefore, it is possible to reduce the occurrence of defects in the refractory covering material due to the detachably provided second member.

In the above-mentioned building fireproof structure, the first member is fixed to a steel frame beam that forms a peripheral portion of a building blowout part and is covered with a fireproof covering material, and work as the second member attached to the first member A work floor may be temporarily installed in the building blow-out portion by the floor receiving member. According to this, when the work floor receiving member is attached to the one member or when the work floor receiving member is removed from the one member, it is possible to reduce the occurrence of defects in the fireproof coating material that covers the steel beam. You can

As the first member, an on-beam fixing member fixed to the upper part of the steel beam is provided, and the on-beam fixing member has a structure in which a supporting plate part is fixed to an upper part of a vertical plate part thereof. Therefore, a fireproof coating material may be provided on the lower surface side of the support plate portion and a base plate may be provided on the upper surface side. The support plate portion of the above-mentioned beam fixing member forms a space between the lower side and the upper side of the steel frame beam in which the fireproof coating material is put.

The working floor receiving member has a structure in which a supporting plate portion for receiving the working floor is fixed to a vertical plate portion thereof, and the supporting plate portion has a rising portion against which an upright surface portion of the working floor abuts. It may be formed. According to this, it is possible to make it difficult for the work floor to be laterally displaced.

A gap into which the refractory coating material can be inserted may be formed between the work floor and the steel beam. According to this, the fireproof coating material can be wound around the steel beam even after the working floor is installed.

Further, the work floor installation method of the building blow-out part of the present invention is a work floor installation method of the building blow-out part using the building fireproof structure, the process of fixing the above-beam fixing member to the steel beam, A process of temporarily installing the work floor by attaching the work floor receiving member to the beam fixing member, a process of coating the steel frame beam with the fire resistant coating material, and the work floor and the above after the work using the work floor is completed. And a step of removing the work floor receiving member.

Advantageous Effects of Invention According to the present invention, in a building fireproof structure in which building components are covered with a fireproof covering material, it is possible to reduce damage to the fireproof covering material due to a member that is detachably provided.

FIG. 1A is a schematic perspective view showing a work floor installation structure of a building blow-out part which is a building fireproof structure according to the embodiment of the present invention, and FIG. 1B is a beam top fixing used for the work floor installation. It is a schematic perspective view which showed the member. FIG. 1A is a schematic explanatory view showing the work floor installation structure of FIG. 1, and FIG. 1B is an explanatory view showing a cut of the fireproof coating material. It is an explanatory view of the outline showing a work floor installation structure of a building blow-out part which is a building fireproof structure concerning other embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The building fire-resistant structure according to this embodiment is a building fire-resistant structure in which a second member is detachably attached to a first member of a building at least a part of which is covered with a fire-resistant covering material. The second member is attached to the first member by stacking and fixing the vertical plate portions provided on each of the second members.

For example, as shown in FIGS. 1(A) and 1(B), a steel beam 1 that forms a peripheral portion of the building blow-out portion 100a is provided on the upper floor of the building 100. The steel frame beam 1 is made of, for example, H-shaped steel, and on one side (room side) of the upper flange of the upper flange and one side (room side) from the center of the upper flange in the width direction, an ALC (Autoclaved Lightweight aerated Concrete) floor plate 2 is provided. Is provided.

Further, as shown in FIG. 2(A), a through hole is formed in the ALC floor plate 2 in the vertical direction, and the end of the ALC floor plate 2 is fixed by the floor plate fixture 3 inserted into the through hole from above. The part is fixed to the upper flange of the steel beam 1. At the lower end of the floor plate fixture 3, a hook portion 3a that opens in an L shape is provided. By dropping the hook portion 3a from the upper side and turning the bolt portion 3b, the hook portion 3a is placed on the lower surface of the upper flange of the steel beam 1. Can be pressed against.

The outer periphery of the steel beam 1 is coated with a fireproof coating material 4. The fireproof coating material 4 is, for example, a flexible wrappable fireproof material made of heat-resistant rock wool, one end side of which is applied to the back surface of the ALC floorboard 2 at the end side, and the other end side thereof is the steel frame beam. It is placed on the other side (building blow-out side) from the center of the upper flange in the width direction. A beam fixing member 5 is provided as the first member on the other side of the widthwise center of the upper flange of the steel beam 1. A wall or floor may be formed on the upper flange of the steel beam 1 on which the on-beam fixing member 5 is provided.

As shown in FIG. 1(B), the above-beam fixing member 5 includes a fixing portion 51 fixed to the upper surface of the upper flange of the steel beam 1 by a fastening member (bolts, nuts, etc.) 11, and this fixing portion. A vertical plate portion 52 fixed to the upper surface of 51 by welding or the like, and support plate portions 53 and 54 fixed to the upper end of the vertical plate portion 52 by welding or the like. The fixing portion 51 has two insertion holes through which the fastening member 11 is inserted, along the longitudinal direction of the steel beam 1, and the upper flange of the steel beam 1 also has the two insertion holes. Insertion holes are formed at the same intervals as the holes. The two insertion holes for each fixing portion 51 formed on the upper flange can be formed in the same manner as the insertion holes for fixing a floor base metal member (not shown) used at other positions. Further, the vertical plate portion 52 is provided upright so as to be orthogonal to the longitudinal direction of the steel beam 1 at a position between the two insertion holes, and has a hook shape, and has the upper flange. It hangs downward on the outside of. Two penetrating holes 52a penetrating in the horizontal direction are formed in the hanging portion so as to be vertically separated from each other. The support plate portions 53 and 54 are horizontally fixed to the upper edge of the vertical plate portion 52, and the support plate portions 53 and 54 support the fireproof plate 21 (base plate) made of ALC or the like. In addition, a space in which the refractory coating material 4 is put is formed between the lower side and the upper flange. The base plate is not limited to the refractory plate 21, but plywood or the like may be provided. Except for the upper surfaces of the support plate portions 53, 54 of the beam fixing member 5, the refractory coating material 4 is covered. The thickness of the fire-resistant coating material 4 is substantially equal to the height from the upper surface of the upper flange to the lower surfaces of the support plate portions 53 and 54, but When using a plate having a thickness lower than the lower surface of the plate portions 53 and 54, another refractory coating material can be provided on the lower surface side of the support plate portions 53 and 54.

A work floor receiving member 6 as the second member is detachably provided on the beam fixing member 5. The work floor receiving member 6 includes a vertical plate portion 61 and a support plate portion 62 fixed to the vertical plate portion 61 by welding or the like. The vertical plate portion 61 is mounted upright so as to be orthogonal to the longitudinal direction of the steel beam 1, and the vertical plate portion 61 has two through holes 61a penetrating in the horizontal direction. The holes are spaced apart in the vertical direction and are formed at the same intervals as the through holes 52a. In the state where the vertical plate portion 61 and the vertical plate portion 52 are overlapped with each other, a fastening member (bolt, nut, etc.) is provided in the through hole 61a and the through hole 52a, and the through hole 61a is fastened to the above-mentioned beam fixing member. The work floor receiving member 6 can be attached to the unit 5. Although the vertical plate portion 61 and the vertical plate portion 52 are overlapped with each other at a part thereof, a convex portion due to the horizontal length of the fastening member is formed, but as a whole, these two vertical plate portions 61 are formed. , 52 is only the sum of the plate thicknesses of 52 and 52, and is relatively thin.

The support plate portion 62 of the work floor receiving member 6 is provided horizontally on the portion of the vertical plate portion 61 projecting to the side of the building blow-out portion 100a, orthogonal to the vertical plate portion 61, and horizontally. The work floor 7 can be placed on the plate portion 62. The height position of the protruding portion of the vertical plate portion 61 is substantially the same as the height position of the upper flange. Further, on the side of the steel frame beam 1 in the support plate portion 62, a rising portion 62a against which an elevation surface portion (side surface or the like) of the work floor 7 abuts is formed. A gap is formed between the rising portion 62a and the edge of the upper flange of the steel beam 1 so that the refractory coating material 4 can be inserted. The work floor 7 is composed of a frame portion 7a and a lid portion 7b provided on the frame portion 7a so as to be openable and closable by a hinge, and the lid portion 7b can be opened and closed as needed during work. it can.

In this embodiment, after the work floor 7 is temporarily installed, the work of winding the fireproof coating material 4 around the steel beam 1 is performed. That is, in this example, the above-mentioned beam fixing member 5 and the above-mentioned work floor receiving member 6 are attached to the above-mentioned steel beam 1, and the above-mentioned fire-resistant coating material 4 is wound around the above-mentioned steel beam 1 in the state where the above-mentioned work floor 7 is temporarily installed. be able to. In winding the fireproof covering material 4, as shown in FIG. 2(B), a vertical cut is made in the portion of the fireproof covering material 4 located at the overlapping position of the vertical plate portion 52 and the vertical plate portion 61. 4a is formed. Then, while avoiding the overlapping portion by the notch 4a, the end side of the fireproof covering 4 is placed on the other side (the building blowout side) from the center of the upper flange of the steel beam 1 in the width direction.

When the work for winding the fireproof covering 4 and other work are completed and the work floor 7 is removed, the work floor receiving member 6 is also removed and collected.

In the above-mentioned configuration, the horizontal thickness of the overlapping portion of the vertical plate portions 52 and 61 of the beam fixing member 5 (first member) and the work floor receiving member 6 (second member) is the above. As described above, although the convex portion formed by the horizontal length of the fastening member is formed in part, the overall thickness is merely the sum of the two plate thicknesses and is relatively thin. Therefore, by expanding the notch 4a formed in the fireproof coating material 4, the fireproof coating is applied to a portion where the vertical plate portions 52 and 61 are overlapped with each other without causing a defect in the fireproof coating material 4. be able to. Then, when the work floor receiving member 6 is removed, a tool (spanner or the like) is inserted from the notch 4a to release the fixed state between the vertical plate portions 52 and 61. When the work floor receiving member 6 is removed, the vertical plate portions 52 and 61 are not overlapped with each other, and a gap is generated between the vertical plate portion 52 of the beam fixing member 5 in the cut 4a. It is possible to bring the fireproof coating material 4 around the notch 4a close to close the gap.

The on-beam fixing member 5 has a structure in which support plate portions 53 and 54 are fixed to the upper portion of the vertical plate portion 52, and the fireproof coating material 4 is provided on the lower surface side of the support plate portions 53 and 54. When the fireproof plate 21 is provided on the upper surface side, the fireproofing of the upper surface side (floor or wall) of the support plate portions 53 and 54 of the beam fixing member 5 can be achieved.

When the support plate portion 62 of the work floor receiving member 6 is formed with the rising portion 62a against which the work floor 7 abuts, it is possible to prevent the work floor 7 from laterally shifting.

If a gap into which the refractory covering 4 can be inserted is formed between the working floor 7 and the steel beam 1, the refractory covering 4 can be wound around the steel beam 1 even after the working floor 7 is installed. You can

Further, the work floor installation method of the building blow-out part of the present invention is the work floor installation method of the building blow-out part using the building fireproof structure, in which the above-beam fixing member 5 is fixed to the steel beam 1. And a step of temporarily installing the work floor 7 by attaching the work floor receiving member 6 to the beam upper fixing member 5, a step of coating the steel frame beam 1 with the fireproof coating material 4, and the work floor 7. A step of removing the work floor 7 and the work floor receiving member 6 after completion of the work. Therefore, when the work floor 7 is temporarily installed, it is possible to reduce the occurrence of defects in the fireproof coating material 4 that covers the steel beam 1. It should be noted that, after the steel frame beam 1 to which the above-beam fixing member 5 is attached is coated with the above-mentioned fireproof coating material 4 in which the notch 4a is formed, the vertical plate portion 61 of the working floor receiving member 6 is provided from the notch 4a. Alternatively, the work floor receiving member 6 may be attached to the above-beam fixing member 5 by a fastening member.

FIG. 3 shows a building fireproof structure in which the on-beam fixing member 5A is used as the first member and the work floor receiving member 6A is used as the second member. As the vertical plate portion 52 of the above-mentioned beam fixing member 5A, a rectangular plate is used without using a hook-shaped plate, and a through hole 52a is provided at one location. Further, the work floor receiving member 6A also has one through hole 61a formed therein. A corner portion 61b is formed on the upper surface of the fixing portion 51 at a portion of the vertical plate portion 61 of the work floor receiving member 6A on the steel beam 1 side. The through hole 52a at one location and the through hole 61a overlap with each other in a state where the vertical edge of the corner portion 61b is brought into contact with the edge of the upper flange of the steel frame beam 1, and a fastening member is provided in the through hole for fastening. By doing so, the work floor receiving member 6A is attached to the beam fixing member 5A.

Although the embodiment of the present invention has been described with reference to the drawings, the present invention is not limited to the illustrated embodiment. 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 2 :ALC floor plate 3 :Floor plate fixture 4 :Fireproof coating 4a :Incision 5 :Beam fixing member 5A :Beam fixing member 6 :Work floor receiving member 6A :Work floor receiving member 7 :Work floor 11: Fastening member 21: Fireproof plate (base plate)
51: fixed part 52: vertical plate part 52a: through hole 53: support plate part 54: support plate part 61: vertical plate part 61a: through hole 62: support plate part 62a: rising part 63: contact horizontal plate part 100 : Building 100a: Building open-air part

Claims (6)

A building fireproof structure in which a second member is detachably attached to a first member of a building, at least a part of which is covered with a fireproof covering material, and which is provided in each of the first member and the second member. The vertical plate portions are overlapped and fixed to each other so that the second member is attached to the first member, and a vertical cut is formed in the fireproof coating material at a position where the vertical plate portions are overlapped with each other. Building fireproof structure characterized by being. The fireproof structure for a building according to claim 1, wherein the first member is fixed to a steel frame beam that forms a peripheral portion of the building blowout portion and is covered with a fireproof covering material, and the second member is attached to the first member. A fire resistant structure for a building, wherein a work floor is temporarily installed in the above-mentioned blow-out part of the building by a work floor receiving member as a member. The building fireproof structure according to claim 2, wherein a beam upper fixing member fixed to an upper portion of the steel beam is provided as the first member, and the beam upper fixing member is supported on an upper portion of a vertical plate portion thereof. A building fireproof structure having a structure in which a plate portion is fixed, a fireproof coating material is provided on a lower surface side of the support plate portion, and a base plate is provided on an upper surface side. The building fireproof structure according to claim 2 or 3, wherein the work floor receiving member has a structure in which a support plate portion for receiving the work floor is fixed to a vertical plate portion thereof. A fireproof structure for a building, characterized in that a rising part is formed on the rising part of the working floor. The building fireproof structure according to any one of claims 2 to 4, wherein a gap into which the fireproof coating material can be inserted is formed between the work floor and the steel beam. Building fireproof structure. A work floor installation method for a building blow-out part using the building fireproof structure according to any one of claims 2 to 5, wherein a step of fixing the first member to the steel beam and the first step. A step of temporarily installing the work floor by attaching the work floor receiving member to a member, a step of coating the steel frame beam with the fireproof coating material, and the work floor and the work floor support after the work using the work floor is completed. A work floor installation method for a building blow-out part, which includes a process of removing members.

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