JP6873612B2 - Fireproof coating structure of steel beam - Google Patents

Description

The present invention relates to a fireproof coating structure of a steel beam.

Conventionally, a type of fireproof coating material that is formed in a sheet shape and wrapped around a steel frame is known. When the steel beam is covered with such a fireproof coating material, the fireproof coating material is fixed to the steel beam by using a welding pin (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-179903

However, fixing the refractory coating material to the steel beam using a welding pin requires specialized skills, but there is a problem that there is a shortage of craftsmen with such specialized skills. Therefore, there is a demand for a technique capable of easily coating a steel beam with a fireproof coating material without requiring specialized skills.

Therefore, an object of the present invention is to provide a fireproof coating structure for a steel frame beam, which can easily cover the steel frame beam with a fireproof coating material.

In order to achieve the above object, the fireproof coating structure of the steel beam according to the present invention is the fireproof coating structure of the steel beam in which the steel beam having the deck plate attached to the upper part is covered with the sheet-like fireproof coating material. It has a fixture for fixing the covering material to the deck plate, and the fixture is configured to be able to penetrate the deck plate from above on the side of the steel beam and to be locked to the deck plate. , A screw configured so that the fireproof coating material can be inserted under the deck plate, and a screw formed larger than the diameter of the screw so that the fireproof coating material can be inserted into the screw below the fireproof coating material. together are lockably configured with threaded, said refractory coating material possess a support member able to support structure from below, and the support member, said screw can be inserted a hole, said hole A holding surface that is located around the portion and presses the fireproof coating material from below, and a holding surface that gradually protrudes downward from the edge of the hole toward the center of the hole, and the screw can be locked. The support to the screw in a state where the screw has a locked piece, the holding surface is locked to the screw so as to be a surface orthogonal to the axis of the screw, and the screw is inserted into the support member. The downward movement of the member is restrained by locking the locked piece to the screw, and the upward movement of the support member with respect to the screw in a state where the screw is inserted into the support member is the engagement. It is characterized in that the stop piece is allowed without being locked to the screw.

In the present invention, the refractory coating material is inserted into the screw supported by the deck plate, and the support member is locked to the screw under the fireproof coating material so that the refractory coating material is supported by being caught by the support member. Therefore, the fireproof coating material can be easily fixed to the deck plate.
Since the fireproof coating material is fixed to the deck plate on the side of the steel frame beam, it is not necessary to directly fix the fireproof coating material to the steel frame beam with a welding pin or the like, so that the steel frame beam is easily covered with the fireproof coating material. can do.

Further, in the fireproof coating structure of the steel beam according to the present invention, the support member includes a hole through which the screw can be inserted, a pressing surface located around the hole and pressing the fireproof coating from below. It has a locked piece that gradually protrudes downward from the edge of the hole toward the center of the hole and can be locked by the screw, and the holding surface is on the axis of the screw. The locked piece is locked to the screw in the downward movement of the support member with respect to the screw in a state where the screw is locked to the screw so as to be an orthogonal plane and the screw is inserted into the support member. constrained Te, wherein the upward movement of the support member to the supporting member with respect to the screw in a state in which the screw is inserted, said that is allowed without the locking piece is locked to the screw.
With such a configuration, if the support member is inserted into the screw locked to the deck plate from the lower side and moved upward and arranged at a desired height, the support member can move downward. Therefore, the support member can be easily locked to the screw, and the fireproof coating material can be easily fixed to the deck plate.

According to the present invention, the steel beam can be easily coated with the fireproof coating material without requiring specialized skill.

It is a figure which shows an example of the fireproof coating structure of the steel frame beam by 1st Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. (A) is a perspective view for explaining the fixture, (b) is a side view of the support member, and (c) is a plan view of the support member. (A) is a diagram for explaining the screw installation process, (b) is a diagram for explaining the screw installation process, and is an enlarged view of the B portion of (a). (A) is a diagram for explaining the first refractory coating material insertion step, (b) is a diagram for explaining the first refractory coating material insertion step, and is an enlarged view of the C portion of (a). (A) is a diagram for explaining the first support member installation process, (b) is a diagram for explaining the first support member installation process, and is an enlarged view of the D portion of (a). It is a figure explaining the 2nd refractory coating material insertion process. It is a figure explaining the 2nd support member installation process. It is a figure explaining the concrete slab construction process. (A) is a diagram for explaining the fixture of the fireproof coating structure of the steel frame beam according to the second embodiment, and (b) is a diagram for explaining how the refractory coating material is fixed to the deck plate by the fixture. (A) is a diagram for explaining the fixture of the fireproof coating structure of the steel frame beam according to the third embodiment, and (b) is a diagram for explaining how the refractory coating material is fixed to the deck plate by the fixture. (A) is a diagram for explaining a modified example of the embodiment of the present invention, and (b) is a diagram for explaining a fixture for fixing a refractory covering material to a pillar or a wall. It is a figure explaining another modification of embodiment of this invention. It is a figure explaining still another modification of embodiment of this invention.

(First Embodiment)
Hereinafter, the fireproof coating structure of the steel frame beam and the fireproof coating method of the steel frame beam according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8.
As shown in FIGS. 1 and 2, the fireproof coating structure 1A of the steel frame beam according to the present embodiment is a fireproof coating structure of the steel frame beam 3 to which the deck plate 2 is attached on the upper portion, and the steel frame beam 3 is a sheet-like fireproof coating. It is covered with material 4. In FIG. 2, the refractory coating material 4 is shown by a chain line in order to show the inside of the refractory coating material 4.
The steel beam 3 is made of, for example, H-shaped steel, and the deck plate 2 is mounted on the upper flange 31. The direction in which the steel beam 3 extends is the length direction, and the horizontal direction orthogonal to the length direction is the width direction.

The deck plate 2 is composed of a flat deck having a flat plate portion 21 attached to the upper flange 31 and a plurality of ribs 22, 22 ... Protruding from the lower side of the flat plate portion 21. In the present embodiment, the deck plate 2 is arranged so that the extending direction of the ribs 22, 22 ... Is the width direction of the steel frame beam 3.
The deck plate 2 is arranged so that the ends of the ribs 22, 22 ... On the steel frame beam side are separated from the steel frame beam 3 so that the ribs 22, 22 ... Do not interfere with the steel frame beam 3. In the present embodiment, the ends of the ribs 22, 22 ... On the steel beam 3 side and the steel beam 3 are separated by about 40 mm.

As shown in FIG. 1, of the flat plate portion 21 of the deck plate 2, the portion between the ribs 22, 22 ... Arranged on one side in the width direction of the steel frame beam and the end portion on the steel frame beam 3 side and the steel frame beam 3. Is the first fireproof coating material fixing portion 23, and the portion between the end portion of the ribs 22, 22 ... Arranged on the other side in the width direction of the steel frame beam 3 on the steel frame beam 3 side and the steel frame beam 3 is the second. The fireproof coating material fixing portion 24 is used.
Further, the vicinity of the end portion of the ribs 22, 22 ... On the steel frame beam 3 side is inclined so that the lower portion gradually moves downward from the steel frame beam 3 side and toward the side separated from the steel frame beam 3. .. The inclined portions on the lower surface of the ribs 22, 22 ... Are referred to as inclined portions 221, 22 ....
A predetermined amount of reinforcing bars (not shown) are arranged on the upper part of the deck plate 2 and concrete 6 is cast.

The refractory coating material 4 is a member in which a refractory material such as glass wool or rock wool is formed into a sheet having a predetermined thickness, and is configured to be wound around a steel frame beam 3. In the present embodiment, a plurality of refractory covering materials 4 are arranged without gaps in the length direction of the steel frame beam 3.
The refractory covering material 4 includes a first side covering portion 41 that covers one side of the steel frame beam 3 in the width direction, a second side covering portion 42 that covers the other side of the steel frame beam 3 in the width direction, and a first. It is continuous with the lower end of each of the side covering 41 and the second side covering 42, and is continuous with the lower covering 43 covering the lower surface of the lower flange 32 of the steel frame beam 3 and the upper end of the first side covering 41. The first fixing portion 44 fixed to the first fireproof coating material fixing portion 23 of the deck plate 2 and the upper end portion of the second side covering portion 42 are continuously fixed to the second fireproof coating material fixing portion 24 of the deck plate 2. It has a second fixing portion 45 to be formed.

The first side covering portion 41 and the second side covering portion 42 are vertically connected so as to connect the widthwise end of the upper flange 31 of the steel frame beam 3 and the widthwise end of the lower flange 32, respectively. It is extending.
In the first fixing portion 44, the side of the first side covering portion 41 is in contact with the first refractory covering material fixing portion 23, and the side separated from the first side covering portion 41 is the inclined portions 221,221 of the ribs 22, 22 ... It is located on the lower side.
In the second fixing portion 45, the side of the second side covering portion 42 is in contact with the second refractory covering material fixing portion 24, and the side separated from the second side covering portion 42 is the inclined portions 221,221 of the ribs 22, 22 ... It is located on the lower side.

As shown in FIGS. 1 to 3, the fixture 5A has a screw 51 penetrating from above through the first refractory coating material fixing portion 23 and the second refractory coating material fixing portion 24 of the deck plate 2, and the diameter of the screw 51. It has a support member 52A which is formed larger than the screw 51 and is inserted from below with respect to the screw 51 and locked to the screw 51.
The screw 51 is inserted into the first refractory coating material fixing portion 23 and the second refractory coating material fixing portion 24 of the deck plate 2 from above, the head portion 511 is arranged on the upper side of the deck plate 2, and the screw portion 512 is provided. It is locked to the deck plate 2 in a state of being arranged under the deck plate 2. As shown in FIG. 3A, screw threads 513 having a predetermined pitch are formed in the screw portion 512.
The support member 52A is a member obtained by processing a disk-shaped plate material 521 having an outer diameter of about 30 mm, which is larger than the diameter of the screw 51, and has a hole 522 through which the screw portion 512 is inserted is formed in a substantially central portion. , A pair of locked pieces 523, 523 formed on the radial outer side of the hole portion 522 and to which the screw portion 512 can be locked are formed.

The pair of locked pieces 523, 523 are arranged so as to sandwich the hole 522, and two cuts are made in the plate material 521 radially outward from the edge of the hole 522, and between the two cuts. Is formed by bending the portion of the plate so as to project diagonally toward one plate surface. The support members 52A are arranged so that the plate surfaces thereof face substantially in the vertical direction and the pair of locked pieces 523 and 523 project diagonally downward.
The pair of locked pieces 523,523 are configured so that their tip portions can be inserted between adjacent threads 513 and 513.

The support member 52A has a pair of locked pieces 523,523 projecting diagonally downward, so that when the screw 51 is inserted, the support member 52A has a pair of locked pieces in the upward direction with respect to the screw 51. The tips of the pieces 523 and 523 are allowed to move while hitting the screw thread 513, and the tips of the pair of locked pieces 523 and 523 are adjacent to each other in the downward direction with respect to the screw 51. It is configured to fit between the matching threads 513 and 513 and restrain movement.
In order to move the support member 52A downward from the screw 51 and remove it, the support member 52A is spirally rotated along the screw thread 513 to remove the support member 52A.

Returning to FIG. 1, in such a fixture 5A, the refractory coating material 4 is inserted into the screw 51 penetrating the deck plate 2 on the lower side of the deck plate 2, and the fixture 5A is supported by the screw 51 from the lower side of the refractory coating material 4. The member 52A is inserted and the support member 52A is locked to the screw 51, and the support member 52A supports the fireproof coating material 4 from below, thereby fixing the fireproof coating material 4 to the deck plate 2.
Further, the fixtures 5A are arranged four by four on the side of the first refractory coating material fixing portion 23 with an interval in the length direction of the steel frame beam 3 with respect to one refractory coating material 4, and the second refractory coating material is provided. Four steel beam beams 3 are arranged on the fixed portion 24 side at intervals in the length direction.

Next, a fireproof coating method for steel beams according to the present embodiment will be described.
First, as shown in FIG. 4, a screw installation step of inserting the screw 51 into the deck plate 2 is performed.
A screw 51 is passed through the first refractory coating material fixing portion 23 and the second refractory coating material fixing portion 24 of the deck plate 2 from above, and the head 511 of the screw 51 is arranged on the deck plate 2 and the screw portion 512 is formed. It is arranged under the deck plate 2 so that the screw 51 is supported by the deck plate 2.

Subsequently, as shown in FIG. 5, a first fireproof coating material insertion step (fireproof coating material insertion) in which the first fixing portion 44 of the fireproof coating material 4 is inserted into the screw 51 penetrating the first fireproof coating material fixing portion 23. Perform the inclusion process).
On the lower side of the deck plate 2, the first fixing portion 44 of the fireproof coating material is inserted into the screw 51 penetrating the first fireproof coating material fixing portion 23 and brought into contact with the deck plate 2. At this time, it is assumed that the first side covering portion 41 is arranged on one side of the steel frame beam 3 in the width direction.

Subsequently, as shown in FIG. 6, a first support member installation step (support member) in which the support member 52A is inserted into the screw 51 into which the first fixing portion 44 is inserted and the fireproof coating material 4 is supported by the support member 52A. Installation process) is performed.
It is inserted into the screw 51 from the support member 52A side and arranged at a predetermined height. As a result, at a predetermined height, the pair of locked pieces 523, 523 of the support member 52A are inserted between the adjacent threads 513, 513 and locked, and the fireproof coating material 4 on the upper side of the support member 52A is released. It is fixed to the deck plate 2 so as not to move downward.

Subsequently, as shown in FIG. 7, the steel frame beam 3 is involved with the fireproof coating material 4 in a state where the first fixing portion 44 is fixed to the deck plate 2, and the second fixing portion 45 of the fireproof coating material 4 is second fireproof. The second fireproof coating material insertion step (fireproof coating material insertion step) of inserting into the screw 51 penetrating the covering material fixing portion 24 is performed.
On the lower side of the deck plate 2, the second fixing portion 45 of the fireproof coating material 4 is inserted into the screw 51 penetrating the second fireproof coating material fixing portion 24 and brought into contact with the deck plate 2. At this time, the lower covering portion 43 is arranged along the lower surface of the steel frame beam 3, and the second side covering portion 42 is arranged on the other side in the width direction of the steel frame beam 3.

Subsequently, as shown in FIG. 8, a second support member installation step (support member installation) in which the support member 52A is inserted into the screw 51 into which the second fixing portion 45 is inserted and the fireproof coating material 4 is supported by the support member 52A. Step).
The support member 52A is inserted into the screw 51 from below and arranged at a predetermined height. As a result, at a predetermined height, the pair of locked pieces 523, 523 (see FIG. 3) of the support member 52A are inserted between the adjacent threads 513, 513 (see FIG. 3) to be locked and supported. The fireproof coating material 4 on the upper side of the member 52A is fixed to the deck plate 2 so as not to move downward.
Then, the steel frame beam 3 is covered with the fireproof coating material 4 by fixing the first fixing portion 44 and the second fixing portion 45 of the fireproof coating material 4 to the deck plate 2, respectively.

Subsequently, as shown in FIG. 9, a concrete slab construction step of placing concrete 6 on the upper part of the deck plate and constructing the concrete slab is performed.
The concrete slab construction step may be performed after the screw installation step or before the steel frame beam 3 is coated with the fireproof coating material 4.

Next, the operation and effect of the fireproof coating structure of the steel frame beam and the fireproof coating method of the steel frame beam according to the present embodiment will be described with reference to the drawings.
In the fireproof coating structure 1A of the steel frame beam according to the present embodiment, the fireproof coating material 4 is inserted into the screw 51 supported by the deck plate, and the support member 52A is locked to the screw 51 under the fireproof coating material 4. Since the fireproof coating material 4 is supported so as to be hooked on the support member 52A, the fireproof coating material 4 can be easily fixed to the deck plate 2. Since the fireproof coating material 4 is fixed to the deck plate 2 on the side of the steel frame beam 3, it is not necessary to directly fix the fireproof covering material 4 to the steel frame beam 3 with a welding pin or the like, so that the steel frame beam 3 can be easily fixed. Can be coated with the fireproof coating material 4.

Further, if the support member 52A is inserted into the screw 51 locked to the deck plate 2 from the lower side and moved upward and arranged at a desired height, the support member 52A does not move downward, so that the screw The support member 52A can be easily locked to the 51, and the fireproof coating material 4 can be easily fixed to the deck plate 2.

Next, other embodiments will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the above-described first embodiment will be described by using the same reference numerals, and the description will be omitted with reference to the first embodiment. Different configurations will be described.
(Second Embodiment)
As shown in FIGS. 10A and 10B, in the fireproof coating structure 1B of the steel frame beam according to the second embodiment, the support member 52B of the fixture 5B can be inserted into the screw 51 under the fireproof coating material 4. The plate member 525, which is configured to support the fireproof coating material 4 from the lower side, and the plate member 525, which is configured to be locked to the screw 51 on the lower side of the plate member 525, can support the plate member 525 from the lower side. It has a configured nut 526.
The plate member 525 is composed of a disk-shaped member having an outer diameter larger than the diameter of the screw 51, for example, about 30 mm, and having a hole formed in a substantially central portion. The plate member 525 is not formed with the locked piece 523 like the support member 52A of the first embodiment.
The nut 526 can be screwed into the threaded portion 512 of the screw 51 and is configured to be locked at a desired position of the threaded portion 512.

In the second embodiment, the fireproof coating material 4 is inserted under the deck plate 2 into the screws 51 inserted into the first fireproof coating material fixing portion 23 and the second fireproof coating material fixing portion 24 of the deck plate 2, and the fireproof coating material 4 is inserted. A plate member 525 is inserted through the screw 51 on the lower side of the covering material 4, and a nut 526 is screwed into the screw portion 512 on the lower side thereof and locked at a desired height.
As a result, the plate member 525 is locked to the screw 51 via the nut 526, and the fireproof coating material 4 is fixed to the deck plate 2 by the plate member 525 locked to the screw 51.

In the fireproof coating structure 1B of the steel frame beam according to the second embodiment, since the plate member 525 is supported by the nut 526 locked to the screw 51, the fireproof coating material 4 can be reliably fixed to the deck plate 2.

(Third Embodiment)
As shown in FIGS. 11A and 11B, in the fireproof coating structure 1C of the steel frame beam according to the third embodiment, the support member 52C of the fixing portion 5C has a screw hole 527 into which the screw portion 512 of the screw 51 can be screwed. It is formed in the shape of a disk having.
The support member 52C has, for example, an outer diameter of about 30 mm, which is larger than the diameter of the screw 51, a thickness of 3 mm or more, and a screw hole 527 formed at a substantially central portion. The support member 52C is configured to be locked to the screw portion 51 by being inserted into the screw 51 and screwing the screw portion 512 into the screw hole 527. Further, by rotating the support member 52C in a state of being inserted into the screw 51, the support member 52C can be locked to the screw portion 512 at a desired height.

In the third embodiment, the fireproof coating material 4 is inserted under the deck plate 2 into the screws 51 inserted into the first fireproof coating material fixing portion 23 and the second fireproof coating material fixing portion 24 of the deck plate 2, and the fireproof coating material 4 is inserted. The support member 52C is inserted through the screw 51 on the lower side of the covering material 4.
As a result, the support member 52C is locked to the screw 51, and the fireproof coating material 4 is fixed to the deck plate 2 by the support member 52C locked to the screw 51.

In the fireproof coating structure 1C of the steel frame beam according to the third embodiment, since the support member 52C is securely and easily locked to the screw 51, the fireproof coating material 4 can be reliably and easily fixed to the deck plate 2.
Further, by rotating the support member 52C, it can be arranged at a desired position with respect to the screw 51.

Although the embodiment of the fireproof coating structure of the steel frame beam according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately changed without departing from the spirit of the present invention.
For example, in the above embodiment, the first fixing portion 44 and the second fixing portion 45 of the refractory covering material 4 are fixed to the deck plate 2 by the fixtures 5A, 5B, 5C, but as shown in FIG. Only one of the first fixing portion 44 and the second fixing portion 45 (the first fixing portion 44 in FIG. 12) is fixed to the deck plate 2 by the fixtures 5A, 5B, 5C, and the other (the second fixing portion 45 in FIG. 12). ) May be fixed to a pillar or wall with a fixture 7 or the like. The fixture 7 that fixes the fireproof coating material 4 to the pillar or wall is, for example, a screw 71 that penetrates the fireproof coating material 4 and is inserted into the pillar or wall, and is locked by the screw 71 to hold down the fireproof coating material 4. It may be in the form of having a disk-shaped pressing plate 72.

Further, in the above embodiment, the deck plate 2 is composed of a flat deck plate having a flat plate portion 21 and ribs 22, 22 ... Protruding from the flat plate portion 21, but the ribs 22, 22 ... Are formed. It may be composed of a deck plate having only a flat plate portion 21 which is not formed. Further, deck plates 2A and 2B having irregularities may be provided as in the fireproof coating structure 1D of the steel beam shown in FIG. 13 and the fireproof coating structure 1E of the steel beam shown in FIG. In such a case, it is preferable that the screws 51 of the fixtures 5A, 5B, and 5C penetrate through the ridged portion 26 recessed below the unevenness of the deck plates 2A and 2B.

Further, in the above embodiment, the deck plate 2 is arranged so that the extending direction of the ribs 22, 22 ... Is the width direction of the steel frame beam 3, but the extending direction of the ribs 22, 22 ... Is the steel frame beam 3. It may be arranged in the direction in the length direction of.
Further, in the above embodiment, the fixtures 5A, 5B, and 5C are spaced apart from one refractory coating material 4 on the side of the first refractory coating material fixing portion 23 in the length direction of the steel frame beam 3. There are four fixtures 5A and 5B provided for one refractory coating material 4, although four are provided on the side of the second refractory coating material fixing portion 24 with an interval in the length direction of the steel frame beam 3. , The number of 5C may be set as appropriate.
Further, in the above-mentioned first embodiment, a pair of locked pieces 523 and 523 are formed on the support member 52A, but the number of locked pieces 523 to be formed may be appropriately set. Further, in the first embodiment, the support member 52A may be composed of a member such as a push nut through which a screw 51 can be inserted, instead of the member on which the pair of locked pieces 523 and 523 are formed.

1A to 1E Steel beam fireproof coating structure 2,2A, 2B Deck plate 3 Steel beam 4 Fireproof coating 5A, 5B, 5C Fixture 51 Screw 52A, 52B, 52C Support member 523 Locked piece 525 Plate member 527 Screw hole

Claims (1)

In the fireproof coating structure of a steel beam in which a steel beam with a deck plate attached to the top is covered with a sheet-like fireproof coating material.
It has a fixture for fixing the fireproof coating material to the deck plate.
The fixture is configured to be able to penetrate the deck plate from above on the side of the steel frame beam and to be locked to the deck plate, and the fireproof coating material is inserted under the deck plate. Possible configured screws and
It is formed larger than the diameter of the screw, is configured to be insertable into the screw under the fireproof coating material, and is configured to be lockable to the screw, so that the fireproof coating material can be supported from below. possess a support member, the,
The support member has a hole through which the screw can be inserted and a hole through which the screw can be inserted.
A pressing surface located around the hole and pressing the refractory coating material from below,
It has a locked piece that gradually protrudes downward from the edge of the hole toward the center of the hole and the screw can be locked.
The holding surface is locked to the screw so as to be a surface orthogonal to the axis of the screw.
The downward movement of the support member with respect to the screw when the screw is inserted into the support member is restrained by locking the locked piece to the screw.
An upward movement of the support member with respect to the screw in a state where the screw is inserted into the support member is allowed without being locked by the screw . Fireproof coating structure.

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