JP7477288B2 - Fireproof coating material, fireproof coating material retention structure, and method for constructing fireproof structure - Google Patents

Description

The present invention relates to a fire-resistant coating material that is placed on a beam with a through hole, and a method for constructing a fire-resistant coating material retention structure and a fire-resistant structure using the same.

The strength of steel beams in building structures decreases when they become hot due to fire or other causes, so to prevent this, the beams must be covered with a fire-resistant material such as rock wool sprayed to a specified thickness.

As an example of a steel beam with such fire-resistant coating, a steel beam has been proposed in which a heat-expandable fire-resistant material is placed on part of the flange section, and the other parts are covered with a sprayed fire-resistant material (Patent Document 1).

On the other hand, beams may generally have through holes formed to allow pipes, wiring, etc. to pass through. When spraying fireproof material onto beams with through holes, the inner periphery of the through holes must also be covered with fireproof material, so the size of the through holes must be made larger than the outer diameter of the pipes, etc. to be installed by the thickness of the fireproof material coating.

Figure 5 is a cross-sectional view showing a conventional fireproof structure 100. A through hole 109 is formed in the web 103a of the beam 103, through which the pipe 105 is inserted. Note that wiring may be used instead of pipes. The flange 103b and web 103a of the beam 103 are covered with a sprayed fireproof material 107. Since the sprayed fireproof material 107 needs to have a certain thickness to obtain fire resistance, the through hole 109 is set larger than the outer diameter of the pipe 105 by the thickness of the sprayed fireproof material 107. This may reduce the strength of the beam.

In response to this, a method has been proposed for the fireproofing of beams with through holes, in which a thermally expandable sheet is placed on the inner surface of the through hole (Patent Document 2).

JP 2017-128844 A JP 2007-198029 A

In this way, when constructing a fireproof structure using sprayed fireproof material, by placing other fireproof coating materials in some areas in advance, the thickness of the fireproof structure can be made thinner than when sprayed fireproof material is provided in those areas. For this reason, it is beneficial to use other fireproof coating materials instead of sprayed fireproof material in places where you want to reduce the thickness of the fireproof material.

However, even if the fireproof coating material is placed in the desired location, there is a risk that it may fall off or become misaligned when spraying the sprayed fireproof material or during preparation for spraying. If the fireproof coating material falls off or becomes misaligned, it will be necessary to reposition the fireproof coating material in the desired location. In addition, when spraying the fireproof material, the worker must hold down the fireproof coating material while working, which makes it difficult to work.

The present invention was made in consideration of these problems, and aims to provide a fire-resistant coating material that can be easily installed in the through-holes of beams, and a method for constructing a fire-resistant coating material retention structure and a fire-resistant structure using the same.

In order to achieve the above-mentioned object, the first invention is a fire-resistant coating material that is placed on the inner circumference of a through hole of a beam having a through hole, the fire-resistant coating material being a substantially cylindrical elongated member having a longitudinal notch cut into part of the circumference, a substantially C-shaped cross section with one open part, and having a heat- expandable member or fire-resistant wool material as a core material , and when the opening is opened by elastic deformation, the restoring force causes the opening to close , thereby directly or indirectly clamping the web of the beam with the opening, thereby making it possible to fix the fire-resistant coating material to the beam .

The fire-resistant covering material is desirably a covering material that covers the core material and at least a portion of the outer surface side of the core material.

According to the first invention, the edge of the through hole can be inserted into the opening of the fire-resistant covering material, so that the fire-resistant covering material can be easily positioned and fixed on the inner surface side of the through hole. This makes the work easier.

In addition, if the fire-resistant coating material has a core material and a coating material that covers the core material, it is possible to prevent the fire-resistant coating material from being damaged during handling, etc. In addition, the coating material can improve the shape retention of the core material, such as fire-resistant wool or a thermally expandable member.

A second invention is a fire-resistant coating material retention structure, in which the fire-resistant coating material is a flexible, approximately cylindrical, elongated member with a longitudinal notch cut in part of the circumferential direction, and in cross section is an approximately C-shaped member with a partial opening, and when the opening is closed, the notch is narrower than the width of the beam web, and when the opening is opened by elastic deformation, the opening tends to close due to a restoring force, and the fire-resistant coating material is arranged to cover the inner surface of a through hole formed in the beam or the inner surface of a beam reinforcement bracket fixed to the through hole, and by widening the opening, the edge of the through hole or at least a part of the beam reinforcement bracket is inserted into the opening, thereby fixing the fire-resistant coating material.

The fire-resistant covering material may include a core material and a covering material covering at least a portion of an outer surface side of the core material.
The generally tubular elongated member may be a generally cylindrical elongated member.
The fire resistant coating may comprise a thermally expandable material or fire resistant wool.

According to the second invention, the fireproof coating material can be easily positioned and fixed on the inner surface of the through hole by inserting the opening of the fireproof coating material into the edge of the through hole. This makes the work easier. Furthermore, the fireproof coating material can be reliably held in place when the fireproof material is then sprayed onto the outer peripheral surface of the beam.

In addition, if the fire-resistant coating material has a core material and a coating material that covers the core material, the coating material can improve the shape retention of the core material, such as a fire-resistant wool material or a thermally expandable member.

A third invention is a method for constructing a fire-resistant covering structure, the fire-resistant covering material being a flexible, approximately cylindrical, elongated member having a longitudinal cut made in a portion of the circumference thereof, being approximately C-shaped in cross section with one open part, and having a thermally expandable material or fire-resistant wool material as a core material , the cut being narrower than the width of the beam web when the opening is closed, and when the opening is opened by elastic deformation, the opening tends to close due to a restoring force, the method comprising the steps of: arranging the fire-resistant covering material to cover the inner surface of a through hole formed in the beam or the inner surface of a beam reinforcement bracket fixed to the through hole, and widening the opening to insert at least the edge of the through hole or at least a portion of the beam reinforcement bracket into the opening to fix the fire-resistant covering material; and spraying a fire-resistant material onto the outer peripheral surface of the beam.

According to the third invention, the fireproof coating material can be easily held by simply attaching it to the inner surface of the through hole, which provides good workability. In addition, the fireproof coating material is held on the inner surface of the through hole 9, which prevents the fireproof coating material from falling off or shifting, making it easy to apply the sprayed fireproof material thereafter.

The present invention provides a fire-resistant coating material that can be easily installed in a beam through-hole, and a method for constructing a fire-resistant coating material retention structure and a fire-resistant structure using the same.

Front view showing the fire-resistant covering material retention structure 10. 1A and 1B are diagrams showing a fire-resistant coating material 5, in which (a) is a plan view, and (b) and (c) are cross-sectional views taken along line B-B of (a). 1A is a cross-sectional view of the fire-resistant covering material holding structure 10, taken along line A-A in FIG. 1; FIG. 1A is a cross-sectional view of a fire-resistant coating material holding structure 10a, and FIG. 1B is a cross-sectional view of a fire-resistant structure 1a. FIG.

First Embodiment
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. Fig. 1 is a front view of a fire-resistant covering material retaining structure 10 according to a first embodiment. The fire-resistant covering material retaining structure 10 has a fire-resistant covering material 5 retained on the inner surface side of a through hole 9 formed in a beam 3.

The beam 3 is made of a so-called H-shaped steel in which a pair of flanges 3b are connected by a web 3a. A through hole 9 is formed in the web 3a, through which pipes and the like are inserted. A fire-resistant coating material 5 is arranged around the inner periphery of the through hole 9 so as to cover the inner surface of the through hole 9.

2(a) is a plan view of the fireproof covering material 5, and FIG. 2(b) is a cross-sectional view of line B-B in FIG. 2(a). As shown in FIG. 2(b), the fireproof covering material 5 has a core material 6a and a covering material 6b that covers at least the outer peripheral surface of the core material 6a. As shown in FIG. 2(c), the covering material 6b may cover the inner peripheral surface of the core material 6a. Alternatively, the covering material 6b may cover both the inner and outer surfaces of the core material 6a. That is, the fireproof covering material 5 has a covering material 6b that covers at least a part of the inner or outer surface of the core material 6a. The core material 6a is made of a flexible flame-retardant or non-combustible material. As the core material 6a, for example, a fireproof wool material such as glass wool or a thermally expandable material can be applied. In addition, the covering material 6b can be a sheet-like member having a certain degree of strength and fire resistance, but by applying, for example, an aluminum-coated glass cloth sheet, the fireproof covering material 5 can have a certain degree of shape retention. However, this is not limited to this embodiment, and any embodiment may be used as long as the fire-resistant coating material can be arranged over approximately the entire circumference so as to cover the inner surface of the through hole, etc. For example, the fire-resistant coating material may be composed only of the core material 6a.

The fireproof coating material 5 is a roughly C-shaped member in which a longitudinal cut is made in a portion of the circumference of a roughly cylindrical long member, and an opening 6c is formed in a portion of the cross section. Note that the shape of the cross section does not necessarily have to be circular, and may be polygonal. When the opening 6c is opened by elastic deformation, the opening 6c has a restoring force that tends to close it.

Figure 3 (a) is a cross-sectional view of the fire-resistant covering material retention structure 10, taken along line A-A in Figure 1. The edge of the through hole 9 is inserted into the opening 6c of the fire-resistant covering material 5, and the fire-resistant covering material 5 is placed on the inner peripheral surface of the through hole 9. As described above, when the opening 6c is widened, the fire-resistant covering material 5 has a restoring force that tends to close it, so that the web 3a is sandwiched between the fire-resistant covering material 5 and the fire-resistant covering material 5 is fixed to the beam 3.

Next, a method for constructing a fire-resistant structure using the fire-resistant covering material 5 will be described. First, the fire-resistant covering material 5 is rolled up with the opening 6c facing outward so as to cover the inner circumferential surface of the through hole 9, and inserted into the opening 6c of the fire-resistant covering material 5 at the edge of the through hole 9. At this time, by making the length of the fire-resistant covering material 5 approximately the same as the inner circumferential length of the through hole 9, the fire-resistant covering material 5 can be placed around approximately the entire circumference of the inner circumferential surface of the through hole 9. For example, a long piece of fire-resistant covering material 5 can be used and cut to a specified length on-site to adjust the length.

In this state, the fireproof coating material 5 is held on the inner surface of the through hole 9, so that the fireproof coating material 5 is prevented from falling off or shifting from the through hole 9 during the subsequent fireproof spraying work and preparation for the work. Finally, the sprayed fireproof material is sprayed onto the outer peripheral surface of the beam 3.

Figure 3 (b) is a cross-sectional view showing a fireproof structure 1 in which a sprayed fireproof material 7 is sprayed on the outer periphery of a beam 3, etc. In the fireproof structure 1, since a fireproof coating material 5 is arranged, a sprayed fireproof material 7 is not required on the inner periphery of the through hole 9 (the inner periphery of the beam reinforcing metal fitting 11). In addition, since the fireproof performance of the fireproof coating material 5 can be improved compared to the sprayed fireproof material 7, the thickness of the fireproof structure can be made thinner compared to the case where the sprayed fireproof material 7 is formed on the inner periphery of the through hole 9 (dotted line). Therefore, the size of the through hole 9 can be made smaller than the outer diameter of the pipe, etc., to be inserted through the through hole 9.

As described above, according to the first embodiment, by using a substantially cylindrical fireproof coating material 5 with a portion of the circumference open, the fireproof coating material 5 can be easily fixed to the inner surface side of the through hole 9 of the beam 3. In this case, the fireproof coating material 5 itself can be fixed by sandwiching the web 3a, so there is no need to use a separate fireproof coating material retaining member.

In this way, the fireproof coating material retention structure 10 using the fireproof coating material 5 can prevent the fireproof coating material 5 from falling off or shifting during subsequent work. This makes it easy to apply the sprayed fireproof material 7 thereafter, and the fireproof structure 1 can be easily obtained.

In addition, since the core material 6a of the fire-resistant covering material 5 is covered with the covering material 6b, for example, when the core material 6a is fire-resistant wool, damage to the wool material and generation of dust during handling can be suppressed, and itching caused to the worker by fine fiber debris can be suppressed. This makes it easy to handle. Furthermore, if the covering material 6b is a metal-coated glass cloth or the like, it has some shape retention, so that the shape is maintained when the fire-resistant covering material 5 is deformed. Therefore, even if the fire-resistant covering material 5 is rolled up and placed on the inner surface of the through-hole 9, the fire-resistant covering material 5 itself maintains its rolled shape, and it is possible to more reliably suppress displacement and falling off.

Second Embodiment
Next, a second embodiment will be described. Fig. 4(a) is a diagram showing a fire-resistant covering material holding structure 10a. The fire-resistant covering material holding structure 10a is substantially similar to the fire-resistant covering material holding structure 10, but differs in that a beam reinforcing metal fitting 11 is used to reinforce a beam 3 having a through hole 9 formed in a web 3a. In the following description, the same components as those in the fire-resistant covering material holding structure 10 and the fire-resistant structure 1 are given the same reference numerals as those in Figs. 1 to 3, and duplicated description will be omitted.

As described above, when a through hole 9 is formed in the beam 3, the through hole 9 reduces the bending strength of the beam 3. The beam reinforcing metal fitting 11 is a member for preventing this reduction in the bending strength of the beam 3. The beam reinforcing metal fitting 11 for reinforcing the beam 3 is fixed by welding or the like to the inside and/or outside of the through hole 9. The beam reinforcing metal fitting 11 is a metal member such as steel or stainless steel. The beam reinforcing metal fitting 11 is a ring-shaped member overall, and has a piping hole through which piping or the like passes. A fire-resistant coating material 5 is arranged on the inner peripheral surface of the beam reinforcing metal fitting 11 so as to cover the inner surface of the beam reinforcing metal fitting 11 around almost the entire circumference.

When using the beam reinforcement bracket 11, first, the beam reinforcement bracket 11 is placed and fixed in the through hole 9 formed in the beam 3. Next, the fire-resistant coating material 5 is rolled and placed with the opening 6c facing outward so as to cover the inner surface of the beam reinforcement bracket 11, and at least a part of the beam reinforcement bracket 11 is inserted into the opening 6c. In this way, a fire-resistant coating material holding structure 10a can be obtained in which the fire-resistant coating material 5 is held on the inner surface side of the through hole 9 (beam reinforcement bracket 11).

Figure 4 (b) is a cross-sectional view showing a fireproof structure 1a in which a sprayed fireproof material 7 is sprayed on the outer periphery of the beams 3, etc. In the fireproof structure 1a, as in the fireproof structure 1, a fireproof coating material 5 is arranged, so that the sprayed fireproof material 7 is not required on the inner periphery of the through hole 9 (the inner periphery of the beam reinforcing metal fitting 11).

According to the second embodiment, the same effect as the first embodiment can be obtained. In this way, the beam 3 can be reinforced by using the beam reinforcement metal fittings 11. In this case, the fire-resistant coating material 5 is provided on the inner circumference of the beam reinforcement metal fittings 11, so that the fire-resistant structure 1a can be easily obtained.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the above-mentioned embodiment. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

1, 1a... Fire-resistant structure 3... Beam 3a... Web 3b... Flange 5... Fire-resistant covering material 6a... Core material 6b... Covering material 6c... Opening 7... Sprayed fire-resistant material 9... Through hole 10, 10a... Fire-resistant covering material holding structure 11... Beam reinforcement metal fitting 100... Fire-resistant structure 103... Beam 103a... Web 103b... Flange 105... Piping 107... Sprayed fire-resistant material 109... Through hole

Claims (7)

A fireproof coating material disposed on an inner periphery of a through hole of a beam having a through hole,
A member having a substantially cylindrical elongated member, a cut being made in a longitudinal direction in a part of the circumferential direction, a substantially C-shaped cross section with a part open, and a core material being a thermally expandable material or a fire-resistant wool material,
A fire-resistant coating material characterized in that when an opening is opened by elastic deformation, the opening attempts to close due to a restoring force , thereby directly or indirectly clamping the web of the beam in the opening, thereby making it possible to fix it to the beam . The fire-resistant coating material according to claim 1, further comprising: the core material; and a coating material covering at least a portion of an outer surface side of the core material. A fire-resistant coating material retention structure,
The fireproof covering material is a flexible, generally cylindrical, long member having a longitudinal cut in a portion of the circumference thereof, and is a generally C-shaped member with an opening in cross section, the cut being narrower than the width of the web of the beam when the opening is closed, and when the opening is opened by elastic deformation, the opening tends to close by a restoring force,
The fireproof covering material is arranged so as to cover an inner surface of a through hole formed in the beam or an inner surface of a beam reinforcing metal fitting fixed to the through hole,
A fire-resistant coating material retention structure characterized in that by widening the opening, the edge of the through hole or at least a part of the beam reinforcement bracket is inserted into the opening to fix the fire-resistant coating material. The fire-resistant coating material retention structure according to claim 3, characterized in that the fire-resistant coating material has a core material and a coating material that covers at least a portion of the outer surface side of the core material. The fire-resistant coating material retention structure according to claim 4, characterized in that the approximately tubular long member is an approximately cylindrical long member. 6. The fire-resistant covering material holding structure according to claim 5, wherein the fire-resistant covering material is a member having a core material of a thermally expandable material or a fire-resistant wool material. A method for constructing a fire-resistant covered structure, comprising the steps of:
The fire-resistant covering material is a flexible, approximately cylindrical, long member having a longitudinal cut in a portion of the circumference thereof, a generally C-shaped cross section with an open portion, and a core material made of a thermally expandable material or fire-resistant wool material, and the cut when the opening is closed is narrower than the width of the web of the beam, and when the opening is opened by elastic deformation, the opening tends to close due to a restoring force,
a step of arranging the fireproof covering material so as to cover an inner surface of a through hole formed in the beam or an inner surface of a beam reinforcing metal fitting fixed to the through hole, and widening the opening, thereby inserting at least an edge of the through hole or at least a part of the beam reinforcing metal fitting into the opening, thereby fixing the fireproof covering material;
spraying a fireproof material on the outer peripheral surface of the beam;
A method for constructing a fire-resistant structure, comprising:

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