JP7421922B2 - Fireproof coating retention structure, construction method of fireproof structure - Google Patents

Description

The present invention relates to a fireproof covering material holding structure in which a fireproof covering material is held on a beam having a through hole, and a method for constructing a fireproof structure using the same.

Steel beams of building structures lose their strength when exposed to high temperatures due to fire, etc. To avoid this, it is necessary to spray the beams with a fire-resistant material such as rock wool to a predetermined thickness to cover them.

As a steel beam coated with such a fireproof coating, for example, a steel beam has been proposed in which a part of the flange part is coated with a thermally expandable fireproofing material, and other parts are covered with a sprayed fireproofing material (patented). Reference 1).

On the other hand, a through hole is generally formed in the beam to allow piping, wiring, etc. to pass therethrough. When spraying refractory material onto a beam with a through-hole, it is necessary to cover the inner circumferential surface of the through-hole with refractory material, so the thickness of the refractory material coating should be determined based on the outside diameter of the pipes, etc. to be installed. It is necessary to increase the size of the through hole accordingly.

FIG. 13 is a sectional view showing a conventional fireproof structure 100. A through hole 109 through which the pipe 105 is inserted is formed in the web 103a of the beam 103. Note that wiring may be used instead of piping. The flange 103b and web 103a of the beam 103 are covered with sprayed refractory material 107. Since the sprayed refractory material 107 needs to have a predetermined thickness in order to obtain fireproof performance, the through hole 109 is set to be larger than the outer diameter of the pipe 105 by the thickness of the sprayed refractory material 107. Therefore, there is a risk that the strength of the beam will decrease.

On the other hand, as a fireproof structure for a beam having a through hole, a method has been proposed in which a thermally expandable sheet is arranged on the inner peripheral surface of the through hole (Patent Document 2).

Japanese Patent Application Publication No. 2017-128844 Japanese Patent Application Publication No. 2007-198029

In this way, when constructing a fire-resistant structure using spray-on fireproofing materials, by placing other fire-resistant covering materials in advance in some areas, the fire-resistant structure becomes more can be made thinner. Therefore, in places where it is desired to reduce the thickness of the refractory material, it is useful to use other fire-resistant coating materials instead of spray-on refractory materials.

However, even if the fireproofing material is placed in the desired location, there is a risk that it will fall off or become misaligned during preparation for spraying the sprayed fireproofing material. If the fireproof coating material falls off or is misaligned, work efficiency is poor, such as the need to reposition the fireproof coating material at a predetermined location.

The present invention has been made in view of these problems, and is a fireproofing method that can reliably hold the fireproof coating material and obtain good workability when placing the fireproof coating material in the through hole of a beam. The purpose of the present invention is to provide a covering material holding structure and a method of constructing a fireproof structure using the same.

In order to achieve the above-mentioned object, the first invention is a fireproof covering material holding structure, in which the fireproof covering material is arranged over substantially the entire circumference on the inner surface side of a through hole formed in a beam, and the fireproof covering material is The coating holding member holds the fireproof coating material against the beam by holding the fireproof coating material in a direction of diameter expansion , and the fireproof coating holding member includes a pressing portion that presses the fireproof coating material, and a pressing portion that presses the fireproof coating material. a magnet or a suction cup for fixing to a beam in the vicinity of the through hole or a beam reinforcing metal fitting fixed to the through hole; is fixed to the beam, and the pressing portion presses the inner surface of the fireproof coating in a direction to expand the diameter, thereby holding the fireproof coating against the beam. It is a structure.

The magnet or the suction cup may be arranged on an arm portion protruding in the width direction of the pressing portion near an end of the pressing portion.

A second invention is a fire-resistant coating holding structure, in which the fire-resistant coating is disposed over substantially the entire circumference on the inner surface side of a through hole formed in a beam, and the fire-resistant coating holding member is arranged such that the fire-resistant coating retains the fire-resistant coating. The fireproof covering material is held against the beam by pressing the material in the direction of diameter expansion, and the fireproof covering holding member connects a pair of pressing parts that press the fireproof covering material and a pair of the pressing parts. and an extensible part that can change the interval between the pressing parts, and the fireproof covering holding member is inserted into the inner surface side of the fireproof covering material in a state where the interval between the pressing parts is shortened, and the A fireproof covering material holding structure characterized in that the fireproof covering material is held against the beam by pressing the inner surface side of the fireproof covering material in a direction to expand the diameter by widening the interval between the pressing parts. be .

A third aspect of the present invention is a fireproof coating holding structure, in which the fireproof coating is disposed over substantially the entire circumference of the inner surface of a through hole formed in a beam, and the fireproof coating holding member is arranged such that the fireproof coating retains the fireproof coating. The fireproof coating is held against the beam by pressing the material in the direction of diameter expansion, and the fireproof coating holding member is joined to the fireproof coating, and the fireproof coating holding member and the fireproof coating are is a substantially annular member with a partially cut off part, the cross-sectional shape of the fireproof covering material is a substantially cylindrical shape having an opening in a part, and the fireproof covering holding member is attached to the through hole along with the fireproof covering material. It is arranged on the inner side of the hole or on the inner side of the beam reinforcing metal fitting fixed to the through hole, and presses the fireproof coating in the direction of expanding the diameter by the restoring force from the state of reducing the diameter due to elastic deformation. The fireproof covering material holding structure is characterized in that the fireproof covering material is held to the beam.
The fireproof coating retaining member may be disposed inside the fireproof coating.

According to the invention No. 1-3 , since the fireproof sheathing member can hold the fireproof sheathing material from the inner surface of the through hole, it is possible to prevent the fireproof sheathing material from falling off or shifting. Therefore, the fireproof covering material can be reliably held in a predetermined position at least until the work of spraying the fireproof material.

At this time, if the fireproof coating holding member is a substantially annular elastic member with a partially cut off, the structure is simple. In addition, it can be easily inserted into the inner surface of the fireproof sheathing material while the diameter is reduced due to elastic deformation, and the restoring force reliably presses the fireproof sheathing material from the inside side, so that the fireproof sheathing material is attached to the beam. can be held.

Furthermore, if the fireproof coating holding member has a magnet or a suction cup for fixing to the web or the beam reinforcing metal fitting, the fireproof coating holding member can be easily fixed to the beam using the magnet or the suction cup. Moreover, even in this case, the fireproof covering material can be held against the beam by reliably pressing the fireproof covering material from the inner surface side by the pressing portion.

At this time, the attachment work is facilitated by fixing the fireproof coating holding member to the beam using a magnet or the like arranged on the arm portion projecting laterally of the pressing portion.

In addition, if the fireproof sheathing holding member has a pair of pressing parts that press down on the fireproof sheathing material and an extensible part that can change the interval between the pressing parts, the fireproof sheathing can be held while the interval between the pressing parts is shortened. To easily insert a member into the inner side of a fireproof sheathing material, and to securely press the fireproof sheathing material from the inside side by widening the interval between pressing parts to hold the fireproof sheathing material against a beam. Can be done. Therefore, it is applicable to a plurality of sizes of through holes.

Further, if the fireproof coating holding member and the fireproof coating material are integrated, the installation work is easy.

A fourth invention is a method for constructing a fireproof coating structure using a fireproof coating holding member, which covers the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole. arranging the fireproof coating material, and holding and fixing the fireproof coating material in the direction of diameter expansion by the fireproof coating holding member, and spraying the fireproof material on the outer peripheral surface of the beam , The method for constructing a fireproof structure is characterized in that the fireproof coating holding member is removed before spraying the fireproof material .

The fireproof sheathing holding member is a substantially annular member with a partially cut part, and is inserted into the inner side of the fireproof sheathing material in a state in which the diameter is reduced by elastic deformation, and is held on the inner side of the fireproof sheathing material by restoring force. The fireproof covering material may be held against the beam by pressing in a direction to expand the diameter.

A fifth invention is a method for constructing a fireproof coating structure using a fireproof coating holding member, which covers the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole. arranging the fireproof coating material, and holding and fixing the fireproof coating material in the direction of diameter expansion by the fireproof coating holding member, and spraying the fireproof material on the outer peripheral surface of the beam, The fireproof coating holding member is joined to the fireproof coating, and the fireproof coating holding member and the fireproof coating are approximately annular members with a portion cut off, and the cross-sectional shape of the fireproof coating is It has a substantially cylindrical shape with an opening in a part, and when the fireproof covering holding member is reduced in diameter by elastic deformation together with the fireproof covering material, the inner side of the through hole or the inner side of the beam reinforcing metal fitting is This method of constructing a fireproof structure is characterized in that the fireproof coating is held against the beam by inserting the fireproof coating into the beam and expanding the diameter by restoring force.
The fireproof coating retaining member may be disposed inside the fireproof coating.

A sixth invention is a method for constructing a fireproof coating structure using a fireproof coating holding member, which covers the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole. arranging the fireproof coating material, and holding and fixing the fireproof coating material in the direction of diameter expansion by the fireproof coating holding member, and spraying the fireproof material on the outer peripheral surface of the beam, The fireproof covering holding member includes a pressing part that presses the fireproof covering material, and a member that is joined to the pressing part and is used for fixing to a beam near the through hole or a beam reinforcing metal fitting fixed to the through hole. It has a magnet or a suction cup, and the magnet or the suction cup fixes the fireproof coating holding member to the beam, and the pressing part presses the inner side of the fireproof coating in a direction to expand the diameter, and the fireproof coating is fixed to the beam. A method for constructing a fireproof structure, characterized in that a covering material is held against the beam.

The fireproof coating holding member is fixed to the beam by the magnet or the suction cup disposed on the arm part protruding in the width direction of the pressure part near the end of the pressure part, and the fireproof coating is fixed to the beam by the pressure part. The fireproof covering material may be held against the beam by pressing the inner surface of the material in a direction that expands the diameter.

A seventh invention is a method for constructing a fireproof coating structure using a fireproof coating holding member, which covers the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole. arranging the fireproof coating material, and holding and fixing the fireproof coating material in the direction of diameter expansion by the fireproof coating holding member, and spraying the fireproof material on the outer peripheral surface of the beam, The fireproof covering holding member includes a pair of pressing parts that press the fireproof covering material, and an extensible part that connects the pair of pressing parts to each other and can change the interval between the pressing parts, and the pressing part The fireproof sheathing holding member is inserted into the inner surface of the fireproof sheath while the distance between them is reduced, and the inner surface of the fireproof sheath is expanded in diameter by widening the distance between the pressing parts. A method for constructing a fireproof structure, characterized in that the fireproof covering material is held against the beam by pressing.

According to the 4-7 invention, the same effects as the 1-3 invention can be obtained, and a fireproof structure can be easily obtained.

According to the present invention, there is provided a fireproof covering material holding structure capable of reliably holding the fireproof covering material and obtaining good workability when placing the fireproof covering material in a through hole of a beam, and a structure using the same. A method for constructing a fireproof structure can be provided.

FIG. 2 is a front view showing the fireproof covering material holding structure 10. FIG. 5 is a diagram showing a fireproof covering material 5, in which (a) is a plan view and (b) is a cross-sectional view taken along the line BB in (a). (a) is a perspective view showing the fireproof coating holding member 13, and (b) is a diagram showing a state in which the fireproof coating holding member 13 is reduced in diameter. (a) is a cross-sectional view of the fireproof covering material holding structure 10, and is a cross-sectional view taken along the line AA in FIG. 1, and (b) is a cross-sectional view of the fireproof structure 1. (a) is a perspective view showing fireproof coating holding member 13d, and (b) is a diagram showing fireproof coating material holding structure 10e. FIG. 3 is a front view showing the fireproof covering material holding structure 10a. (a) is a sectional view of the fireproof covering material holding structure 10a, and is a sectional view taken along the line CC in FIG. 5, and (b) is a sectional view of the fireproof structure 1a. (a) is a perspective view showing a fireproof covering material 5a, and (b) is a sectional view taken along the line DD in (a). A sectional view showing fireproof covering material holding structure 10f. (a) is a cross-sectional view of the fireproof coating holding structure 10b, and (b) is a diagram showing the fireproof coating holding member 13a. (a) is a cross-sectional view of the fireproof coating holding structure 10c, and (b) is a diagram showing the fireproof coating holding member 13b. The figure which shows 10 d of fireproof covering material holding structures. FIG. 1 is a cross-sectional view showing a fireproof structure 100.

(First embodiment)
Embodiments of the present invention will be described below. FIG. 1 is a front view showing a fireproof covering material holding structure 10 according to a first embodiment. In the fireproof covering material holding structure 10, a fireproof covering material 5 is held on the inner surface side of a through hole 9 formed in a beam 3 by a fireproof covering material holding member 13.

The beam 3 is composed of a so-called H-beam steel in which a pair of flanges 3b are connected by a web 3a. A through hole 9 through which a pipe or the like is inserted is formed in the web 3a. A fireproof covering material 5 is disposed on the inner circumferential surface of the through hole 9 over substantially the entire circumference so as to cover the inner surface of the through hole 9 .

FIG. 2(a) is a plan view of the fireproof covering material 5, and FIG. 2(b) is a sectional view taken along the line BB in FIG. 2(a). As shown in FIG. 2(b), the fireproof covering material 5 includes a core material 6a and a covering material 6b that covers the core material 6a. The core material 6a is made of a flexible flame retardant or noncombustible material. As the core material 6a, it is possible to use, for example, a fire-resistant wool material such as glass wool, a thermally expandable material, or the like. Further, the covering material 6b can be applied as long as it is a sheet-like member having a certain degree of strength and fire resistance, but for example, by applying an aluminum-coated glass cloth sheet, etc. Retention properties can be obtained. However, the invention is not limited to this embodiment, and any embodiment may be used as long as the fireproof covering material can be disposed over substantially the entire circumference so as to cover the inner surface of the through hole or the like. For example, it may be a fireproof coating made of only the core material 6a.

FIG. 3(a) is a perspective view showing the fireproof coating holding member 13. The fireproof coating holding member 13 is a partially cut out substantially annular member, and is made of metal or resin, for example. As shown in FIG. 3(b), the fireproof coating holding member 13 can be reduced in diameter by elastic deformation.

FIG. 4(a) is a cross-sectional view of the fireproof covering material holding structure 10, and is a cross-sectional view taken along the line AA in FIG. As described above, the fireproof covering material 5 is disposed on the inner circumferential surface of the through hole 9, and the fireproof covering material 5 is held by the fireproof covering holding member 13.

As described above, since the fireproof coating holding member 13 can be reduced in diameter, when it is inserted into the inner surface of the fireproof coating 5, it can be easily inserted into the inner surface of the fireproof coating 5 by reducing its diameter. Can be done. Moreover, the refractory coating holding member 13 whose diameter has been reduced tries to return to its original shape due to the restoring force. Therefore, the fireproof coating holding member 13 can hold the fireproof coating 5 against the beam 3 (the inner surface of the through hole 9) by pressing the inner surface of the fireproof coating 5 in the direction of expanding the diameter.

.
Next, a method of constructing a fireproof structure using the fireproof coating holding member 13 will be explained. First, the fireproof covering material 5 is rolled up and placed inside the through hole 9 so as to cover the inner peripheral surface of the through hole 9 formed in the beam 3 . At this time, by making the length of the fireproof covering material 5 substantially the same as the inner peripheral length of the through hole 9, the fireproof covering material 5 can be arranged over substantially the entire circumference of the inner peripheral surface of the through hole 9. can. Next, the fireproof sheathing holding member 13 is inserted into the inner surface of the fireproof sheathing material 5 in a reduced diameter state.

Thereafter, by returning the reduced diameter fireproof sheathing holding member 13 to its original diameter by restoring force, the fireproof sheathing holding member 13 presses the inner side of the fireproof sheathing material 5 in the direction of expanding the diameter, and the fireproof sheathing material 5 is It can be temporarily fixed to the beam 3 (inner surface side of the through hole 9). That is, the outer diameter of the fireproof coating holding member 13 in an unreduced state is larger than the inner diameter of the fireproof coating 5 in the installed state. Through the above steps, the fireproof covering material holding structure 10 can be obtained. Therefore, during preparation for subsequent spraying work of fireproof material, etc., it is possible to prevent the fireproof covering material 5 from falling off or shifting from the through hole 9.

Next, after the preparation for spraying the fireproof material is completed, the fireproof coating holding member 13 is removed. Finally, spray refractory material is sprayed onto the outer peripheral surface of the beam 3.

FIG. 4(b) is a sectional view showing a fireproof structure 1 in which sprayed fireproofing material 7 is sprayed on the outer periphery of the beam 3. In the fireproof structure 1, since the fireproof coating material 5 is arranged, the sprayed fireproof material 7 is not necessary on the inner peripheral surface of the through hole 9. In addition, since the fireproofing performance of the fireproof covering material 5 can be improved compared to the sprayed refractory material 7, the fireproofing performance is improved compared to the case where the sprayed fireproofing material 7 is formed on the inner peripheral surface of the through hole 9 (dotted line). The thickness of the structure can be reduced. Therefore, the size of the through hole 9 can be made smaller than the outer diameter of the pipe or the like inserted through the through hole 9.

In the illustrated example, the sprayed refractory material 7 was installed after removing the fireproof coating holding member 13, but the sprayed refractory material 7 was installed with the fireproof coating holding member 13 attached, and the sprayed refractory material 7 was installed. It can be removed later. Further, after the sprayed refractory material 7, the fireproof coating holding member 13 may be left as is, or furthermore, at least a portion of the fireproof coating holding member 13 may be buried in the sprayed refractory material 7. For example, as described above, since the fireproof covering material 5 has a certain degree of shape retention, even if the fireproof covering holding member 13 is removed, it will not immediately fall off or become misaligned. Therefore, if the purpose is only to hold the fireproof coating 5 during preparation for spraying the fireproof material, the fireproof coating holding member 13 may be removed immediately before the sprayed fireproof material 7 is applied. However, in order to suppress falling off or displacement of the fireproof coating 5 during construction of the sprayed refractory material 7, the sprayed refractory material 7 may be constructed with the fireproof coating holding member 13 attached.

Further, in the example described above, the fireproof coating holding member 13 was shorter than the inner diameter of the fireproof coating material 5, but the present invention is not limited to this. For example, like the fireproof coating holding member 13d shown in FIG. 5(a), it may have a substantially circular shape with a portion cut off, and both ends in the circumferential direction may be wrapped.

FIG. 5(b) is a diagram showing a fireproof covering material holding structure 10e using a fireproof covering holding member 13d. By reducing the diameter of the fireproof coating holding member 13d by elastic deformation, disposing it on the inner circumferential surface of the fireproof coating 5, and expanding the diameter by restoring force, the fireproof coating holding member 13d can hold the inner surface of the fireproof coating 5. The fireproof covering material 5 can be fixed to the beam 3 by pressing in the direction of diameter expansion.

As described above, according to the first embodiment, since the fireproof coating holding member 13 is used, the fireproof coating holding member 13 is simply installed on the inner surface side of the fireproof coating material 5, and the fireproof coating holding member 13 is installed on the inner surface side of the through hole 9 of the beam 3. , the fireproof covering material 5 can be easily fixed. Therefore, workability is also good. Moreover, since the structure is simple, the cost is low.

In this way, the fireproof sheathing holding structure 10 that holds the fireproof sheathing 5 using the fireproof sheathing holding member 13 prevents the fireproof sheathing 5 from falling off or shifting during the subsequent preparatory work for spraying the sprayed fireproofing material 7. can do. Therefore, the fireproof structure 1 can be easily obtained.

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

(Second embodiment)
Next, a second embodiment will be described. FIG. 6 is a diagram showing the fireproof covering material holding structure 10a, and FIG. 7(a) is a sectional view taken along the line CC in FIG. 6. In the following description, the same components as the fireproof covering material holding structure 10 and the fireproof structure 1 are given the same reference numerals as in FIGS. 1 to 5, and redundant description will be omitted.

In the second embodiment, a beam reinforcing metal fitting 11 is used for reinforcing the beam 3 in which the through hole 9 is formed in the web 3a. As described above, when the through hole 9 is formed in the beam 3, the bending strength of the beam 3 is reduced due to the through hole 9. The beam reinforcing metal fitting 11 is a member for preventing the bending strength of the beam 3 from decreasing.

A beam reinforcing metal fitting 11 for reinforcing the beam 3 is fixed to the inside and/or outside of the through hole 9 by welding or the like. The beam reinforcing metal fitting 11 is a member made of metal such as steel or stainless steel. The beam reinforcing metal fitting 11 is a ring-shaped member as a whole, and has a pipe hole through which a pipe or the like passes. A fireproof covering material 5 is disposed on the inner peripheral surface of the beam reinforcing metal fitting 11 over substantially the entire circumference so as to cover the inner surface of the beam reinforcing metal fitting 11 .

When using the beam reinforcing metal fittings 11, first, the beam reinforcing metal fittings 11 are placed and fixed in the through holes 9 formed in the beams 3. Next, the fireproof covering material 5 is rolled up and placed so as to cover the inner circumferential surface of the beam reinforcing metal fitting 11. Next, the fireproof coating holding member 13 is reduced in diameter and inserted into the inner surface of the through hole 9 (fireproof coating material 5).

From this state, by returning the reduced diameter fireproof sheathing holding member 13 to its original diameter by restoring force, the fireproof sheathing holding member 13 presses the fireproof sheathing material 5 from the inner side, and the fireproof sheathing material 5 is moved to the beam 3 ( It can be fixed to the inner surface of the through hole 9). Through the above steps, the fireproof covering material holding structure 10a can be obtained.

In this state, after preparation for spraying the fireproof material is completed, the fireproof coating holding member 13 is removed. Finally, spray refractory material is sprayed onto the outer peripheral surface of the beam 3.

FIG. 7(b) is a sectional view showing a fireproof structure 1a in which sprayed fireproofing material 7 is sprayed on the outer periphery of beams 3 and the like. In the fireproof structure 1a, since the fireproof coating material 5 is disposed, the sprayed fireproof material 7 is not required on the inner peripheral surface of the through hole 9 (the inner peripheral surface of the beam reinforcing metal fitting 11). As described above, the sprayed refractory material 7 may be applied while the fireproof coating holding member 13 is attached, or the fireproof coating holding member 13 may be left after the sprayed refractory material 7 is installed.

According to the second embodiment, effects similar to those of the first embodiment can be obtained. In this way, by using the beam reinforcing metal fittings 11, the beam 3 can be reinforced. At this time, by providing the fireproof covering material 5 on the inner surface of the beam reinforcing metal fitting 11, the fireproof structure 1a can be easily obtained.

(Third embodiment)
Next, a third embodiment will be described. FIG. 8(a) is a diagram showing the fireproof coating holding member 13e, and FIG. 8(b) is a sectional view taken along the line DD in FIG. 8(a). Moreover, FIG. 9 is a sectional view showing a fireproof covering material holding structure 10f using a fireproof covering holding member 13e. In addition, in the following embodiment, an example in which the beam reinforcing metal fitting 11 is used will be described, but the fireproof coating material may be directly fixed to the inner surface (web 3a) of the through hole 9 without using the beam reinforcing metal fitting 11. .

The fireproof covering material 5a has an approximately C-shaped shape as a whole, with a portion of the approximately circular shape being cut off, and its cross-sectional shape is also a shape in which an opening portion 12 is formed by cutting off a portion of the approximately circular shape. It is. Note that the cross-sectional shape is not limited to a substantially circular shape, and may be other shapes such as a substantially polygonal shape. At this time, the opening 12 is formed over the entire circumference toward the outer circumferential side of the fireproof coating 5a.

A fireproof coating holding member 13e is disposed and integrated inside the fireproof coating 5a. Note that the fireproof coating holding member 13e may be arranged outside the fireproof coating 5a (on the outer peripheral surface on the opposite side to the opening 12). Like the fireproof coating holding member 13, the fireproof coating holding member 13e is made of metal or resin, for example, and can be reduced in diameter by elastic deformation and expanded in diameter by restoring force. Note that the fireproof sheathing holding member 13e may be plate-shaped or rod-shaped, and may be disposed as part of the inside and outside of the fireproof sheathing material 5a on the opposite side to the opening 12. . That is, the fireproof coating holding member 13e may be a member narrower than the fireproof coating material 5a.

Next, a method of using the fireproof covering material 5a will be explained. First, the fireproof coating holding member 13e is reduced in diameter by elastic deformation together with the fireproof coating material 5a, and is inserted into the through hole 9. Next, the diameter of the fireproof coating holding member 13e is expanded together with the fireproof coating material 5a by restoring force. At this time, the edge of the through hole 9 (the beam reinforcing metal fitting 11 fixed to the edge of the through hole 9) is inserted into the opening 12 of the fireproof coating 5a.

By making the length of the fireproof sheathing material 5a substantially match the inner diameter of the through hole 9, the fireproof sheathing material 5a can be spread over the entire circumference of the edge of the through hole 9 (the beam reinforcing metal fitting 11 fixed to the edge of the through hole 9). can be placed. Moreover, since the fireproof coating material 5a is pushed open by the restoring force of the fireproof coating holding member 13e, the fireproof coating material 5a can be reliably fixed to the through hole 9.

Thereafter, a fireproof structure can be obtained by spraying a sprayed fireproofing material onto the outer peripheral surface of the beam 3. In this case, the fireproof covering holding member 13e is embedded in the sprayed fireproofing material together with the fireproof covering material 5a.

According to the third embodiment, the same effects as the first embodiment can be obtained. Further, by integrating the fireproof covering material 5a and the fireproof covering holding member 13e, installation is easy. Moreover, since the cross-sectional shape of the fireproof covering material 5a is substantially cylindrical having an opening 12 in a part thereof, the edge of the through hole 9 and the beam reinforcing metal fitting 11 can be reliably covered.

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 10(a) is a sectional view showing the fireproof covering material holding structure 10b.

The fireproof covering material holding structure 10b has substantially the same structure as the fireproof covering material holding structure 10a, but differs in that a fireproof covering material holding member 13a is used.

FIG. 10(b) is a diagram showing the fireproof coating holding member 13a. The fireproof coating holding member 13a has substantially the same configuration as the fireproof coating holding member 13, but has a different shape. The fireproof covering holding member 13a has a pressing part 14a that presses the fireproof covering 5, an arm part 14b provided near the end of the pressing part 14a, and a magnet 14c provided in the arm part 14b.

The pressing portion 14a is a substantially annular member with a portion cut off, and can be reduced in diameter, similarly to the fireproof coating holding member 13 described above. Arm portions 14b protruding in the width direction of the pressing portion 14a are provided near both ends of the pressing portion 14a. In the illustrated example, the arm portions 14b are bent toward the outer periphery of the pressing portion 14a, and the pair of arm portions 14b oppose each other near each end of the pressing portion 14a. Magnets 14c are arranged on opposing surfaces of the arm portions 14b, respectively. That is, the magnet 14c is joined to the pressing part 14a via the arm part 14b. The magnet 14c is a portion fixed to a beam near the through hole 9 or to a beam reinforcing metal fitting 11 fixed to the through hole 9.

In this case, first, the beam reinforcing metal fittings 11 are arranged and fixed in the through holes 9 formed in the beams 3. Next, the fireproof covering material 5 is rolled up and placed so as to cover the inner circumferential surface of the beam reinforcing metal fitting 11. Next, the fireproof coating holding member 13a is reduced in diameter and inserted into the inner surface of the through hole 9 (fireproof coating material 5). Next, the diameter-reduced fireproof covering holding member 13a is returned to its original diameter, and the fireproof covering material 5 is held down from the inner side by the fireproof covering holding member 13a. In this state, the arm portion 14b is bent to the outside of the pressing portion 14a, and the magnet 14c is fixed to the side surface of the web 3a or the beam reinforcing metal fitting 11. As described above, the fireproof coating holding member 13a is fixed to the beam, the fireproof coating 5 is pressed from the inner side by the pressing part 14a, and the fireproof coating holding structure 10b holds the fireproof coating 5 against the beam 3. can be obtained.

In this state, after preparation for spraying the fireproof material is completed, the fireproof coating holding member 13a is removed. Finally, a fireproof structure can be obtained by spraying a sprayed fireproofing material onto the outer peripheral surface of the beam 3. As described above, the sprayed refractory material 7 may be installed with the fireproof coating holding member 13a attached, and in this case, a part of the fireproof coating holding member 13a is buried in the sprayed refractory material 7. Ru.

According to the fourth embodiment, effects similar to those of the first embodiment can be obtained. Moreover, since the fireproof covering holding member 13a is fixed to the beam 3 by the magnet 14c, the fireproof covering material 5 can be held to the beam 3 more reliably.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 11(a) is a sectional view showing the fireproof covering material holding structure 10c. The fireproof covering material holding structure 10c has substantially the same structure as the fireproof covering material holding structure 10b, but differs in that a fireproof covering material holding member 13b is used.

FIG. 11(b) is a diagram showing the fireproof coating holding member 13b. The fireproof coating holding member 13b has substantially the same configuration as the fireproof coating holding member 13a, but differs in that a suction cup 14d is provided in place of the magnet 14c. The fireproof covering holding member 13a has a pressing part 14a that presses the fireproof covering 5, an arm part 14b provided near the end of the pressing part 14a, and a suction cup 14d provided on the arm part 14b.

Arm portions 14b protruding in the width direction of the pressing portion 14a are provided near both ends of the fireproof coating holding member 13b, respectively. In the illustrated example, the arm portions 14b are bent toward the outer periphery of the pressing portion 14a, and one arm portion 14b is arranged near each end of the pressing portion 14a. Similarly to 13a, a pair of arm portions 14b may be provided. A suction cup 14d is arranged on the inner surface side of the arm portion 14b. That is, the suction cup 14d is joined to the pressing part 14a via the arm part 14b. The suction cup 14d is a portion that is fixed to a beam near the through hole 9 or to a beam reinforcing metal fitting 11 fixed to the through hole 9.

In this case as well, the fireproof coating holding member 13b can be fixed to the beam in the same manner as the fireproof coating holding member 13a. That is, the fireproof covering material 5 is pressed from the inner side by the pressing portion 14a, and the fireproof covering material holding structure 10c in which the fireproof covering material 5 is held against the beam 3 can be obtained.

According to the fifth embodiment, the same effects as the fourth embodiment can be obtained. In this way, the fireproof coating holding member can be fixed to the beam 3 using a magnet or a suction cup.

(Sixth embodiment)
Next, a sixth embodiment will be described. FIG. 12 is a sectional view showing the fireproof covering material holding structure 10d. The fireproof covering material holding structure 10d has substantially the same structure as the fireproof covering material holding structure 10, etc., but differs in that a fireproof covering material holding member 13c is used.

The fireproof coating holding member 13c includes a pair of pressing parts 14f that presses the fireproof coating 5, and an extensible part 14e that connects the pair of pressing parts 14f and can change the interval between the pressing parts 14f. The pressing portion 14f has, for example, an arcuate outer shape corresponding to the inner surface shape of the through hole 9 (beam reinforcing metal fitting 11). The illustrated telescopic portion 14e is a turnbuckle, and by rotating the turnbuckle, the interval between the pressing portions 14f can be changed. Note that the elastic part 14e may have other forms as long as the interval between the pressing parts 14f can be changed. For example, a stretchable elastic body may be used as the stretchable portion 14e.

In this case, after arranging the fireproof sheathing material 5 so as to cover the inner surface of the through hole 9 or the beam reinforcing metal fitting 11, the fireproof sheathing holding member is attached to the fireproof sheathing material 5 while reducing the distance between the pressing parts 14f. Insert it on the inside side. Thereafter, the distance between the pressing portions 14f is widened by the elastic portion 14e, thereby pressing the fireproof covering material 5 from the inner surface side. As described above, a fireproof covering material holding structure 10d in which the fireproof covering material 5 is held on the beam 3 can be obtained. Thereafter, after the preparation for spraying the fireproofing material is completed, the fireproof coating holding member 13c is removed and the spraying fireproofing material is installed.

According to the sixth embodiment, the same effects as the first embodiment can be obtained. In this way, by using the fireproof sheathing holding member 13c in which the interval between the pressing portions 14f changes, the fireproof sheathing material 5 can be easily temporarily fixed. Further, one fireproof coating holding member 13c can be applied to through holes 9 (beam reinforcing metal fittings 11) of a plurality of sizes.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the technical idea stated in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs.

For example, it goes without saying that the configurations described above can be combined with each other. For example, the fireproof sheathing holding members 13, 13a, 13b, and 13d are separate from the fireproof sheathing material 5, but they are integrated with the fireproof sheathing material 5, and the fireproof sheathing material 5 and the fireproof sheathing holding member are separated. It may be possible to install both at the same time.

1, 1a...Fireproof structure 3...Beam 3a...Web 3b...Flanges 5, 5a...Fireproof coating 6a...Core material 6b...Coating material 7...Sprayed fireproofing Material 9...Through holes 10, 10a, 10b, 10c, 10d, 10e...Fireproof covering material holding structure 11...Beam reinforcement fittings 12...Openings 13, 13a, 13b, 13c, 13d, 13e ......Fireproof coating holding members 14a, 14f...Press section 14b...Arm section 14c...Magnet 14d...Suction cup 14e...Extensible section 100...Fireproof structure 103...Beam 103a... ...Web 103b...Flange 105...Piping 107...Sprayed refractory material 109...Through hole

Claims (12)

A fireproof coating retaining structure,
A fireproof covering material is disposed over substantially the entire circumference of the inner surface of the through hole formed in the beam,
The fireproof sheathing holding member holds the fireproof sheathing material in a direction of diameter expansion to hold the fireproof sheathing material against the beam ;
The fireproof coating holding member is
a pressing part that presses the fireproof covering material;
a magnet or a suction cup that is joined to the pressing part and is fixed to a beam near the through hole or a beam reinforcing metal fitting fixed to the through hole;
The fireproof sheathing holding member is fixed to the beam by the magnet or the suction cup, and the pressing portion presses the inner surface of the fireproof sheath in the direction of expanding the diameter, thereby causing the fireproof sheathing to be attached to the beam. A fireproof covering material holding structure characterized by holding a fireproof covering material. The fireproof covering material holding structure according to claim 1 , wherein the magnet or the suction cup is disposed on an arm portion protruding in the width direction of the pressing portion near an end of the pressing portion. A fireproof coating retaining structure,
A fireproof covering material is disposed over substantially the entire circumference of the inner surface of the through hole formed in the beam,
The fireproof sheathing holding member holds the fireproof sheathing material in a direction of diameter expansion to hold the fireproof sheathing material against the beam ;
The fireproof coating holding member is
a pair of pressing parts that press the fireproof covering material;
an extensible part that connects a pair of the pressing parts to each other and can change the interval between the pressing parts;
Equipped with
The fireproof coating holding member is inserted into the inner surface of the fireproof coating while the distance between the pressing parts is reduced, and the diameter of the inner surface of the fireproof coating is expanded by widening the distance between the pressure parts. A fireproof covering material holding structure characterized in that the fireproof covering material is held against the beam by pressing in a direction in which the fireproof covering material is held against the beam. A fireproof coating retaining structure,
A fireproof covering material is disposed over substantially the entire circumference of the inner surface of the through hole formed in the beam,
The fireproof sheathing holding member holds the fireproof sheathing material in a direction of diameter expansion to hold the fireproof sheathing material against the beam ;
The fireproof coating holding member is joined to the fireproof coating material, and the fireproof coating holding member and the fireproof coating material are approximately annular members with a portion cut off,
The cross-sectional shape of the fireproof covering material is approximately cylindrical with an opening in part,
The fireproof sheathing holding member is disposed together with the fireproof sheathing material on the inner surface of the through hole or on the inner surface of a beam reinforcing metal fitting fixed to the through hole, and is capable of restoring a state in which the diameter has been reduced due to elastic deformation. A fireproof covering material holding structure characterized in that the fireproof covering material is held against the beam by pressing the fireproof covering material in a direction in which the diameter thereof is expanded by force . The fireproof covering material holding structure according to claim 4, wherein the fireproof covering material holding member is arranged inside the fireproof covering material. A method for constructing a fireproof coating structure using a fireproof coating holding member, the method comprising:
A fireproof coating is arranged to cover the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole, and the diameter of the fireproof coating is expanded by the fireproof coating holding member. A process of pressing and fixing in the direction,
spraying a fireproof material on the outer peripheral surface of the beam;
Equipped with
A method for constructing a fireproof structure , comprising removing the fireproof coating holding member before spraying the fireproof material . The fireproof sheathing holding member is a substantially annular member with a partially cut part, and is inserted into the inner side of the fireproof sheathing material in a state in which the diameter is reduced by elastic deformation, and is held on the inner side of the fireproof sheathing material by restoring force. 7. The method of constructing a fire-resistant structure according to claim 6 , wherein the fire-resistant coating is held against the beam by pressing in a direction of expanding the diameter. A method for constructing a fireproof coating structure using a fireproof coating holding member, the method comprising:
A fireproof coating is arranged to cover the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole, and the diameter of the fireproof coating is expanded by the fireproof coating holding member. A process of pressing and fixing in the direction,
spraying a fireproof material on the outer peripheral surface of the beam;
Equipped with
The fireproof coating holding member is joined to the fireproof coating material, and the fireproof coating holding member and the fireproof coating material are approximately annular members with a portion cut off,
The cross-sectional shape of the fireproof covering material is approximately cylindrical with an opening in part,
The fireproof coating holding member is inserted into the inner surface of the through hole or the beam reinforcing metal fitting in a state in which the diameter has been reduced by elastic deformation together with the fireproof coating material, and the diameter is expanded by restoring force. A method of constructing a fireproof structure, comprising holding a fireproof coating to the beam . 9. The method of constructing a fireproof structure according to claim 8, wherein the fireproof coating holding member is disposed inside the fireproof coating. A method for constructing a fireproof coating structure using a fireproof coating holding member, the method comprising:
A fireproof coating is arranged to cover the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole, and the diameter of the fireproof coating is expanded by the fireproof coating holding member. A process of pressing and fixing in the direction,
spraying a fireproof material on the outer peripheral surface of the beam;
Equipped with
The fireproof coating holding member is
a pressing part that presses the fireproof covering material;
a magnet or a suction cup that is joined to the pressing part and is fixed to a beam near the through hole or a beam reinforcing metal fitting fixed to the through hole;
fixing the fireproof coating holding member to the beam by the magnet or the suction cup;
A method for constructing a fire-resistant structure , characterized in that the pressing portion presses the inner surface of the fire-resistant covering material in a direction in which the diameter thereof increases, thereby holding the fire-resistant covering material against the beam . Fixing the fireproof covering holding member to the beam by the magnet or the suction cup disposed on the arm portion protruding in the width direction of the pressing portion near the end of the pressing portion,
11. The method for constructing a fireproof structure according to claim 10 , wherein the pressing portion presses the inner surface of the fireproof coating in a direction to expand the diameter of the fireproof coating to hold the fireproof coating against the beam. . A method for constructing a fireproof coating structure using a fireproof coating holding member, the method comprising:
A fireproof coating is arranged to cover the inner surface of a through hole formed in a beam or the inner surface of a beam reinforcing metal fitting fixed to the through hole, and the diameter of the fireproof coating is expanded by the fireproof coating holding member. A process of pressing and fixing in the direction,
spraying a fireproof material on the outer peripheral surface of the beam;
Equipped with
The fireproof coating holding member is
a pair of pressing parts that press the fireproof covering material;
an extensible part that connects a pair of the pressing parts to each other and can change the interval between the pressing parts;
Equipped with
The fireproof covering holding member is inserted into the inner surface of the fireproof covering while the distance between the pressing portions is reduced, and the diameter of the inner surface of the fireproof covering is expanded by widening the distance between the pressing portions. A method for constructing a fireproof structure, the method comprising : holding the fireproof covering material against the beam by pressing in a direction in which the fireproof covering material is held against the beam .

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