JP6947235B2 - Synthetic coating fireproof structure of steel pipe columns - Google Patents

Description

The present invention relates to a fireproof structure of a steel pipe column, and more particularly to a synthetic coating fireproof structure of a steel pipe column in which a wall is constructed by laminating wall panel materials of a vertical fitting method and the wall is utilized as a part of the fireproof coating. Is.

For buildings, the required fire resistance time is set according to the scale, parts, etc. by the Building Standard Law and related laws and regulations. In steel-framed buildings, the yield strength of steel materials decreases due to heating, so a fireproof coating typified by sprayed rock wool is applied to suppress the rise in steel material temperature so that a certain level of yield strength can be exhibited within the required fire resistance time. doing.

In the conventional fireproof structure certification of steel columns using sprayed rock wool, the coating thickness of sprayed rock wool is, for example, 25 mm for 1-hour fire resistance (see Non-Patent Document 1) and 45 mm for 2-hour fire resistance (non-patent). (Refer to Reference 2), the coating thickness differs depending on the required fire resistance time.

On the other hand, when the steel column is arranged close to the wall panel material, it is difficult to apply the fireproof coating on the portion facing the wall panel material. Therefore, the fireproof wall panel material is used as a part of the fireproof coating. There is a synthetically coated fireproof structure of steel columns that was utilized.
In such a synthetic coating fireproof structure of a steel frame column, the separation distance between the wall panel material and the steel frame column is often used when the separation distance is about 200 mm or less, and the fireproof coating material is extended from the side surface of the steel frame column toward the wall panel material at the separation portion. The fireproof coating in the separated portion is omitted.

As the wall panel material, an ALC board (lightweight cellular concrete board cured by high temperature and high pressure steam), a PC board (precast concrete board), an extruded cement board and the like are used.
Extruded cement board (wall panel material) is made by extruding a paste made by adding water to cement, siliceous raw material, organic fiber, and organic admixture, and then performing primary curing and then steam curing to obtain the specified strength. Manufactured by expressing and slicing.

As shown in FIG. 7, the wall panel material 117 made of an extruded cement plate has a plurality of cavities continuous in the longitudinal direction arranged adjacent to each other, and has a plurality of openings 91 on the short side. One end surface of the long side has a continuous convex portion 93, and the other end surface has a concave portion 95 into which the convex portion 93 fits. In the case of horizontal tension, the convex portion 93 is arranged as the upper surface. Then, a horizontal joint is formed and laminated in the vertical direction to form a wall. The horizontal joint is provided with a gap of about 10 mm to 15 mm so that the inner surface of the convex portion 93 on the upper part of the lower wall panel material 117 and the inner surface of the concave portion 95 on the lower part of the upper wall panel material 117 are in a non-contact state with either surface. It is common to place and fix it. The outdoor side of the horizontal joint is waterproofed with a sealing material 97 and a backup material 99, and a gasket is placed on the indoor side as needed, but in many cases, it is not treated.

Non-Patent Document 3 discloses an extruded cement plate / sprayed rock wool synthetic coated steel pipe column, and together with a fire resistant coating material, sprayed rock wool, an extruded cement plate having fire resistance is used as a steel pipe column. It is used as a part of the fireproof coating of. Here, for convenience of explanation, regarding the portion of the angle member, the surface on the side where the ridge angle portion is formed is defined as the outer surface, and the back surface thereof is defined as the inner surface. In this structure, as shown in FIGS. 8 and 9, the steel pipe column 103 and the wall panel material 117 are spaced apart from each other, and the wall panel material 117 is a ruler angle 107 (wall base material) continuous in the height direction. It is arranged so as to be in contact with the outer surface of the steel pipe and is attached by a fastener 125. The ruler angle 107 is supported by the steel pipe column 103 via the bracket 109 (connecting member), whereby the wall panel material 117 is supported by the steel pipe column 103. The flange tip of the ruler angle 107 in contact with the wall panel material 117 faces outward with respect to the column core. The sprayed rock wool 115 on the side surface of the steel pipe column 103 is extended toward the wall, and the lath net 113 is attached to the rib 111 made of the reinforcing bar extending from the steel pipe column 103 toward the wall panel material 117 to withstand fire. Sprayed rock wool 115 is applied as a coating base material.

Similar to Non-Patent Documents 1 and 2, this structure is confirmed by a performance evaluation test conducted based on predetermined conditions, and is certified by the Minister of Land, Infrastructure, Transport and Tourism as stipulated in Article 2, Item 7 of the Building Standards Act. I received it.
The performance evaluation test for the above certification is to verify the structural safety by installing a test piece in a heating furnace and heating it at the standard heating temperature of ISO834 with a long-term load on the steel pipe column. The four sides of the pillar (the entire surface of the extruded cement board and the fireproof coating) are heated.

Certificate of Minister of Land, Infrastructure, Transport and Tourism FP060CN-9460 (sprayed rock wool coated steel column) Certificate of Minister of Land, Infrastructure, Transport and Tourism FP120CN-9463 (Sprayed rock wool coated steel column) FP060CN-0539 (Extruded cement board / sprayed rock wool synthetic coated steel pipe column) Certificate of Minister of Land, Infrastructure, Transport and Tourism FP060CN-9203 (fiber-mixed calcium silicate cement extruded board / sprayed rock wool synthetic coating / steel pillar)

Japanese Unexamined Patent Publication No. 2018-080521 Japanese Unexamined Patent Publication No. 2013-234459 Japanese Unexamined Patent Publication No. 9-100587 Microfilm of Jitsugyohei No. 2-57568 (Jitsukaihei No. 4-16203)

The problems of the synthetically coated fireproof structure of the steel pipe column in Non-Patent Document 3 will be described.
The wall panel material 117 used here has a non-bearing outer wall 1-hour fire resistance.
When the upper and lower wall panel materials 117 are heated for a required fire resistance time or longer, the wall panel materials 117 suddenly shrink when the temperature of the wall panel materials 117 exceeds a certain temperature. Therefore, in the horizontal tension method, the width of the horizontal joint, which is the fitting joint, may be expanded and penetrate to the back surface. As a result, hot air flows into the inside from the horizontal joint, and the temperature of the gap surrounded by the wall panel material 117, the spray rock wool 115 (fireproof coating material) and the steel pipe column 103 rises remarkably, and the spray lock Depending on the thickness of the wool 115 and the cross-sectional dimensions of the steel pipe column 103, the temperature of the steel material on the side facing the gap may rise significantly, leading to collapse.

Non-Patent Document 4 shows a vertically stretched wall panel material, and the vertical joints have the same structure as the horizontal joints of Non-Patent Document 3, but the inside of the joints is filled with a non-combustible packing material. Have been placed. Further, in Patent Document 1, a sealing material is arranged in the horizontal joint fitting portion in the horizontal stretching method for waterproofing, and from these, it can be easily assumed that the refractory material is arranged in the horizontal joint in the horizontal stretching method.
However, as described above, when the wall panel material 117 contracts due to heating, the upper wall panel material 117 contracts upward and the lower wall panel material 117 contracts downward, so that the horizontal joints open. When the refractory material is compressed and filled inside the joint, the refractory material is left in the concave portion 95 at the lower part of the upper wall panel material 117, so that the refractory material is separated from the convex portion 93 of the lower wall panel material 117. , There is a problem that the joint cannot be closed.

Further, if a gap is created between the fireproof coating extension portion and the wall panel material 117 due to deformation of the wall panel material 117 or shrinkage of the sprayed rock wool 115 (fireproof coating material), it becomes a weak point in fire resistance. The sprayed rock wool 115, which is extended to the wall panel material 117, is supported by the force bones 111 arranged at predetermined intervals, although it is preferable that the density is increased and the joint is firmly joined. Since it is sprayed on, it is difficult to perform compaction construction because the reaction force cannot be taken when the sprayed rock wool 115 is compacted except for the part where the force bone 111 is located. , Prone to non-damaging weaknesses. Therefore, it takes time and effort to provide a backup material in the relevant portion.

Patent Document 2 discloses a "steel frame fireproof coating structure" as a structure capable of preventing the outer wall and the fireproof coating from being separated from each other. The refractory coating structure of the steel frame includes a steel column installed in contact with the wall or installed at intervals, a heat-expandable fire-resistant sheet (fire-resistant coating) covering the steel column, and the heat-expandable fire-resistant coating. It is provided with a combustible fixing auxiliary plate for pressing both ends of the sheet from the outside to the wall and fixing means for fixing both ends of the heat-expandable refractory sheet to the wall, and thermally expands to cover the steel column. Both ends of the refractory sheet are pushed from the outside toward the wall by the combustible fixing auxiliary plate, and are fixed to the wall by fixing means.

However, when considering applying the method disclosed in Patent Document 2 to the construction method of Non-Patent Document 3, when the wall panel material 117 is an extruded cement board, it is possible to drive in the fixing means at the time of construction. There is a risk of cracking and damage during subsequent service, and in fact, driving of fixing means is not permitted in the construction procedure of extruded cement boards.

Further, as a structure that can be expected to have a similar effect, Patent Document 3 discloses "a fireproof coating structure of a steel frame column". In this structure, a positioning member for positioning the fireproof board on the wall surface or floor surface of the building is fixed to the wall surface or floor surface, and the fireproof board is maintained at a predetermined distance from the steel frame column by the positioning member. It is positioned, the space between the surface of the steel frame column and the fireproof board is filled with an adhesive, and the steel frame column and the fireproof board are adhesively fixed.

The one disclosed in Patent Document 3 is reminiscent of the vertical stretching method of ALC from FIGS. 1, 2, and 7, and the wall surface positioning member arranged at the joint portion between the refractory board and the wall is an outer wall. It is arranged for the purpose of improving the installation accuracy of the fireproof board.
On the other hand, when the refractory board is replaced with the sprayed rock wool 115 of Non-Patent Document 3 and examined, the vertical tension method deforms convexly to the opposite side to the column when the ALC is thermally deformed. Is considered to have the effect of closing the gap when the refractory board and the wall panel material are separated from each other without using a backup material. That is not recommended. Further, since the flange is directed to the outside of the fireproof coating, there is a problem that the construction area of the sprayed rock wool 115 increases and the pillar shape becomes large.

In Patent Document 4, a fireproof coating base material is embedded in advance on the wall side so that the outer wall and the fireproof coating material are not separated from each other. However, in the extruded cement board, this method is adopted due to the characteristics of the manufacturing method. Can not do it.

As described above, various techniques that contribute to the measures for preventing the separation between the wall and the fireproof coating material have been disclosed, but the technique that can be horizontally deployed to the wall panel material 117 that uses the extruded cement plate, which is the subject of the present invention. However, it does not solve the problem of Non-Patent Document 3.

The present invention has been made to solve such a problem, and is a synthetic coating fireproof structure of a steel pipe column in which a steel pipe column is fireproofly coated with a wall body and sprayed rock wool. It is an object of the present invention to provide a synthetic coated fireproof structure of a steel pipe column having excellent undamaged and heat-shielding properties at a joint.
Further, in addition to the above, it is an object of the present invention to provide a synthetic coating fireproof structure of a steel pipe column capable of preventing hot air from entering the inside from the lateral joint portion of the wall body.

(1) The synthetic coating fireproof structure of a steel pipe column according to the present invention is a fireproof coating of a square steel pipe column with a wall body and sprayed rock wool.
It is a synthetic coating fireproof structure of steel pipe columns that fireproofly coats square steel pipe columns with walls and sprayed rock wool.
A wall body arranged in front of the square steel pipe column, a pair of wall base materials arranged on the surface of the wall body on the side of the square steel pipe column to fix the wall body, and one end of the wall base material. A pair of connecting members made of an angle member which is connected to a material and the other end is connected to the square steel pipe column directly or via a member to connect the wall base material and the square steel pipe column, and both sides of the square steel pipe column. A force bone provided so as to extend from a surface toward the wall body, and a fireproof coating fixed to the force bone and arranged so as to extend from both side surfaces of the square steel pipe column to the wall body. The base material, the fireproof coating base material, and the sprayed rock wool sprayed on three surfaces other than the wall-side surface of the square steel pipe column are provided.
The pair of connecting members are arranged so that the inner surface sides face each other and one surface portion forming the ridge angle portion thereof is on an extension line of the side surface of the square steel pipe column.
The pair of wall base materials are made of an angle material continuous in the height direction, one face portion forming the ridge angle portion thereof is brought into contact with the wall body, and the back surface of the other face portion is one face portion of the connecting material. Fixed to
The strength bone is fixed by bringing the side portion on one end side into contact with the side surface of the square steel pipe column, and the other end is set to a length up to or near the tip of the flange forming the other surface portion of the wall base material. Being done
A fireproof coating base material is arranged on at least the outer surface of the force bone, and the fireproof coating base material is arranged on the back surface and both side surfaces of the square steel pipe column, the fireproof coating base material, and the other surface portion of the wall base material to the wall body. It is characterized in that the sprayed rock wool is arranged throughout.

(2) Further, it is a synthetic coating fireproof structure of a steel pipe column in which a square steel pipe column is fireproofly coated with a wall body and sprayed rock wool.
A wall body arranged in front of the square steel pipe column, a pair of wall base materials arranged on the surface of the wall body on the side of the square steel pipe column to fix the wall body, and one end of the wall base material. A pair of connecting members made of an angle member which is connected to a material and the other end is connected to the square steel pipe column directly or via a member to connect the wall base material and the square steel pipe column, and both sides of the square steel pipe column. A force bone provided so as to extend from a surface toward the wall body, and a fireproof coating fixed to the force bone and arranged so as to extend from both side surfaces of the square steel pipe column to the wall body. The base material, the fireproof coating base material, and the sprayed rock wool sprayed on three surfaces other than the wall-side surface of the square steel pipe column are provided.
The pair of connecting members face each other on the inner surface side, and one surface portion forming the ridge angle portion thereof is arranged so as to be shifted toward the column core side from the extension line of the side surface of the square steel pipe column.
The pair of wall base materials are made of angle members that are continuous in the height direction, and one surface portion forming the ridge angle portion thereof is brought into contact with the wall body, and the outer surface of the other surface portion is the side surface of the square steel pipe column. It is arranged so as to be on an extension line, and the inner surface of the surface portion is fixed to one surface portion of the connecting member.
In the force bone, one end side is brought into contact with the side surface of the square steel pipe column to be fixed, and the other end is brought into contact with the other face portion of the wall base material, and in a non-contact state with the wall body. Placed,
A fireproof coating base material is arranged on at least the outer surface of the force bone, and the fireproof coating base material is arranged on the back surface and both side surfaces of the square steel pipe column, the fireproof coating base material, and the other surface portion of the wall base material to the wall body. It is characterized in that the sprayed rock wool is arranged throughout.

(3) Further, in the one described in (1) or (2) above, the wall body has a convex portion formed continuously over the entire length on the upper end surface and the lower end surface over the entire length. , The wall panel material having continuous recesses wider than the width of the convex portion is laminated in the vertical direction, and the horizontal joint between the upper and lower wall panel materials arranged in a laminated manner is the wall panel material. Both the upper convex portion and the lower concave portion of the wall panel material have a gap portion held in a non-contact state.
It is characterized in that a refractory material is arranged between the upper surface of the convex portion and the lower surface of the concave portion in the gap portion with a width at least equal to or larger than the projection range of the square steel pipe column.

(4) Further, in the above (3), the refractory material is arranged in a non-contact state with the side surface inside the recess inside the lower portion of the upper wall panel, and / or the convex portion of the upper portion of the lower wall panel. It is characterized in that the refractory material is not made to follow the upper wall panel.

According to the synthetic coating fireproof structure of the square steel pipe column according to the present invention, the wall base material becomes the fireproof coating base material in the joint portion between the fireproof coating extension portion made of sprayed rock wool and the wall body, which is a weak point in fire resistance. Since they are arranged in contact with each other, the sprayed rock wool can be easily and surely compacted.
Further, even if the connecting portion is separated due to the deformation of the wall panel material or the shrinkage of the fireproof coating material, the wall base material functions as a backup and does not create a gap through which hot air penetrates. Since the ribs do not come into contact with the wall panel material, it is possible to prevent the ribs that thermally expand in a heating environment from locally damaging the wall panel material that deteriorates at a high temperature. can do.
Due to these actions, the synthetic coating fireproof structure of the steel pipe column of the present invention can enhance the non-damage property of the synthetic fireproof portion, suppress the decrease in heat shielding property, and improve the fire resistance performance.
Further, in the case where the refractory material at least the width of the square steel pipe column is sandwiched and compacted in the horizontal joints of the upper and lower wall panel materials, even if the horizontal joints expand due to the shrinkage of the wall panel materials, hot air is contained in the gaps. It is difficult to create a gap through which the lumber penetrates.

It is a top view of the synthetic coating fireproof structure of the steel pipe column which concerns on Embodiment 1 of this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a top view of the synthetic coating fireproof structure of the steel pipe column which concerns on Embodiment 2 of this invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is explanatory drawing of the wall body of the synthetic coating fireproof structure of the steel pipe column in Embodiment 3. It is explanatory drawing of the action of the wall body of the synthetic coating fireproof structure of the steel pipe column in Embodiment 3. FIG. It is explanatory drawing of the conventional wall body. It is a top view of the composite coating fireproof structure of the conventional steel pipe column. FIG. 8 is a cross-sectional view taken along the line AA of FIG.

[Embodiment 1]
As shown in FIGS. 1 and 2, the composite coating fireproof structure 1 of the steel tube column according to the present embodiment fireproofly coats the square steel tube column 3 with the wall body 5 and the sprayed rock wool 15, and is square. A wall body 5 arranged in front of the steel pipe column 3, a pair of wall base materials 7 arranged on the surface of the wall body 5 on the side of the square steel pipe column 3 to fix the wall body 5, and a wall base material 7 A pair of connecting members 9 made of an angle member for connecting the square steel column 3 and a force bone 11 provided so as to extend from both side surfaces of the square steel tube column 3 toward the wall body 5, and the force bone 11 Other than the fireproof coating base material 13 that is fixed and arranged so as to extend from both side surfaces of the square steel pipe column 3 to the wall body 5, and the surfaces of the fireproof coating base material 13 and the square steel pipe column 3 on the wall body 5 side. It is configured with sprayed rock wool 15 sprayed on three sides.
Each configuration will be described in detail.

<Square steel pipe column>
The square steel pipe column 3 is formed by, for example, roll forming or press forming in which the corners are arcuate. The dimensions and shape of the square steel pipe column 3 are not limited, and examples thereof include BCR295 □ -350 × 350 × 19. In addition to the above, the square steel pipe column may be a so-called welded four-sided box column in which a thick plate is assembled by welding.
In the present application, among the four surfaces of the square steel pipe column 3, the surface portion on the wall body 5 side is defined as the front surface portion, the surface portion on the opposite side is defined as the back surface portion, and the surface portions on both sides of the front surface portion are defined as the side surface portions.

<Wall body>
The wall body 5 is arranged in front of the square steel pipe column 3, and in the present application, the side of the wall body 5 facing the square steel pipe column 3 is defined as indoor, and the back surface thereof is defined as outdoor.
The wall body 5 is a wall in which a convex portion 93 continuous over the entire length is formed on the upper end surface, and a continuous concave portion 95 wider than the width of the convex portion 93 is formed on the lower end surface over the entire length. The panel material 117 (see FIG. 7) is laminated and arranged in the vertical direction. The horizontal joint between the upper and lower wall panel materials 117 that are laminated and arranged is a gap portion in which both the convex portion 93 at the upper part of the wall panel material 117 and the concave portion 95 at the lower part of the wall panel material 117 are held in a non-contact state. have.

The wall panel material 117 forming the wall body 5 is, for example, an extruded cement plate having a thickness of 60 mm, and the mounting method is a horizontal stretching method. When laminating the wall panel materials 117 in the vertical direction by the horizontal stretching method, here, the wall panel materials 117 are arranged at intervals of 10 mm as the height of the horizontal joints. As shown in FIG. 7, a sealing material 97 and a backup material 99 are installed on the outdoor side of the horizontal joint.

The material of the wall panel material 117 may be an extruded cement board or another material such as an ALC board (lightweight cellular concrete board cured by high temperature and high pressure steam).

<Wall base material>
The wall base material 7 is a member arranged on the surface of the wall body 5 on the side of the square steel pipe column 3 to fix the wall body 5, and is composed of a pair of left and right sides with respect to one square steel pipe column 3. There is.
The pair of wall base materials 7 (ruler angles) are made of angle materials that are continuous in the height direction. As the angle material constituting the wall base material 7, any shape and dimension can be selected as long as it is equal to or larger than the cross-sectional dimension required for structural strength, but here, L-50 × 50 × 6 will be described as an example.
The wall base material 7 is fixed by bringing one surface portion forming the ridge angle portion into contact with the wall body 5 or via a hard packing (not shown), and the other surface portion is one surface portion of the connecting member 9. It is fixed to the outer surface of 9a. In the present embodiment, one surface portion in contact with the wall body 5 is defined as the first flange 7a, and the other surface portion fixed to the connecting member 9 is defined as the second flange 7b.

The wall base material 7 is fixed to the wall body 5 by a fastener 25 (a steel plate 27 (commonly known as Z hardware) bent into a substantially Z shape, bolts 29, and flat nuts 31) arranged on the indoor surface of the wall body 5. By the method, the first flange 7a of the wall base material 7 is sandwiched between the wall body 5 and the fastener 25. Then, in general, the wall base material 7 and the fastener 25 are finally welded and fixed.
The wall base material 7 may be fixed to the wall body 5 by using hook bolts.

The inner angle side surface of the second flange 7b of the wall base material 7 is joined to one surface portion 9a of the connecting member 9.
Joining may be done by welding, fixing with bolts and nuts, or a combination of welding and bolts and nuts.
When fixing with bolts and nuts, fix by normal bolt holes or welding at one fixing part with the connecting member 9 at the upper end, lower end, or intermediate part in the height direction, and the other parts are height. It is better to make a long hole in the direction. According to this, since the change in the material length of the wall base material 7 due to thermal expansion at the time of fire is not restrained between the fulcrums of the connecting material 9, the wall base material 7 is prevented from being deformed convexly between the fulcrums. It is possible to prevent forced deformation to the wall body 5.

<Connecting material>
One end of the connecting member 9 is connected to the wall base material 7, and the other end is connected to the square steel pipe column 3 via an angle piece 35 to connect and support the wall base material 7 and the square steel pipe column 3. It is a thing. The other end of the connecting member 9 may be directly joined to the square steel pipe column 3 without passing through the angle piece 35.
The pair of connecting members 9 face each other on the inner surface side (in other words, with the ridge angle portion facing outward), and one surface portion 9a forming the ridge angle portion is on an extension line of the side surface of the square steel pipe column 3. It is arranged so as to be. In the example shown in FIG. 1, the other surface portion 9b of the connecting member 9 is arranged on the lower side of the one surface portion 9a, but may be arranged on the upper side.

The length of the connecting member 9 can be arbitrarily set according to the separation distance between the square steel pipe column 3 and the wall body 5 and the second flange 7b of the angle member constituting the wall base material 7. When the distance between the square steel pipe column 3 and the wall body 5 is 250 mm in the specification of the form, about 230 mm is preferable.

In the present embodiment, since the angle piece 35 is used as a member for fixing one end of the connecting member 9 to the square steel pipe column 3, the specific specifications thereof will be described.
The angle piece 35 is arranged at a corner R (outer R) portion on the front side of the square steel pipe column 3, and is set to a dimension larger than the corner R. Since the corner radius dimension of the square steel pipe column 3 is 47.5 mm in this example, the angle piece 35 has a flange inner dimension larger than the corner radius dimension of the square steel pipe column 3, L-60 × 60 × 6, length. The height is 100 mm, and the ridges thereof are fixed at intervals of 500 mm in the height direction with the ridges facing outward. One end side of a connecting member 95 made of an L-50 × 50 × 6 angle member is fixed to the angle piece 35.
In this embodiment, the distance between the square steel pipe column 3 and the wall body 5 is equal to or greater than that of the second flange 7b of the wall base material 7.

<Strength bone>
The force bone 11 is provided so as to extend from both side surfaces of the square steel pipe column 3 toward the wall body 5. The force bone 11 is fixed by abutting the side portion on one end side against the side surface of the square steel pipe column 3 and fixing the other end to the tip of the second flange 7b or its vicinity forming the other surface portion of the wall base material 7. It is set to the length.
The force bone 11 is made of, for example, a round bar having a diameter of 9 mm, and supports a fireproof coating base material 13 made of a lath net. The force bones 11 are arranged at intervals of 450 to 500 mm in the height direction of the square steel pipe column 3 at positions avoiding interference with the angle piece 35, and one end thereof is about 50 mm on the side surface (flat plate portion) of the square steel pipe column 3. The length is set to, and it is fixed by welding. The other end may be fixed by abutting on the tip of the second flange 7b of the wall base material 7, or may not be fixed as a length to the vicinity thereof.

<Fireproof coating base material>
The fireproof coating base material 13 serves as a base material for sprayed rock wool 15 which is a fireproof coating material, and is composed of a lath net.
The fireproof coating base material 13 made of a lath net covers at least the range of the corner R portion or more of the square steel pipe column 3, and the wall panel material 117 side has a length of the strength bone 11 or more. Here, the length is set so that the wall base material 7 reaches the side surface of the second flange 7b and is substantially in contact with the wall panel material 117.

<Sprayed rock wool>
The sprayed rock wool 15 serves as a fireproof coating material, and includes at least the fireproof coating base material 13 arranged on the outer surface of the rib 11, the back surface and both side surfaces of the square steel pipe column 3, and the wall base material 7. It is arranged from the second flange 7b of the above to the wall body 5.

The sprayed rock wool 15 is sprayed onto the exposed portion of the fireproof coating base material 13 and the square steel pipe column 3 and compacted to a predetermined thickness. In order to obtain a finishing thickness of 25 mm, spraying with a spraying thickness of about 35 mm and compacting to 25 mm can achieve a density required for fire resistance.
Since the portion of the fireproof coating base material 13 made of the lath net is located outside the side surface of the square steel pipe column 3 by the diameter of the rib 11, the construction is carried out in consideration of that portion.

In the present embodiment, the first flange 7a of the wall base material 7 is directed toward the center side of the square steel pipe column 3, and the outer surface of the second flange 7b is arranged on the extension line of the side surface of the square steel pipe column 3. Therefore, since the second flange 7b functions as a support member during the sprayed rock wool compaction construction, the fireproof coating near the wall, which is important for fire resistance, can be easily compacted.
Further, according to the spraying method, the consolidation of the portion is generally made from the fireproof coating base material 13 to 25 mm, but even if the portion is compacted to the extension line of the side surface of the square steel pipe column 3, the wall base material 7 is used. Therefore, it can be easily managed at an accurate position.

According to the synthetic coating fireproof structure 1 of the steel pipe column according to the present embodiment configured as described above, the extension portion of the fireproof coating material made of sprayed rock wool 15, which is a weak point in fire resistance, and the wall panel material 117. Since the wall base material 7 is arranged in contact with the fireproof coating base material 13 at the joint portion, the sprayed rock wool 15 can be easily and surely compacted.
Further, even if the connecting portion is separated due to the deformation of the wall panel material 117 or the shrinkage of the fireproof coating base material 13, the wall base material 7 functions as a backup and does not create a gap through which hot air penetrates. Since the force bone 11 is prevented from coming into contact with the wall panel material 117, the force bone 11 that thermally expands in a heating environment locally damages the wall material that deteriorates at a high temperature. Can be prevented.

[Embodiment 2]
The composite coated fireproof structure 39 of the steel pipe column according to the second embodiment will be described with reference to FIGS. 3 and 4. The member configuration of the second embodiment is the same as that of the first embodiment, and in FIGS. 3 and 4, the same parts as those of FIGS. 1 and 2 showing the first embodiment and the corresponding parts have the same reference numerals. Is attached.
The main difference between the second embodiment and the first embodiment is that the connecting member 9 is shifted toward the center of the square steel pipe column 3, and one of the surface portions 9a forming the flanged angle portion of the connecting member 9 is the square steel pipe column 3. The thickness of the flange portion of the wall base material 7 is arranged closer to the center of the square steel pipe column 3 than on the extension line of the side surface, and the outer surface of the second flange 7b of the wall base material 7 is on the extension line of the side surface of the square steel pipe column 3. The point is that the inner surface of the second flange 7b is fixed to one surface portion 9a of the connecting member 9. As a result, the force bone 11 is arranged in contact with the outer surface of the second flange 7b of the wall base material 7. The force bone 11 extends to the vicinity of the wall panel material 117, but is set to a length that does not come into contact with the wall panel material 117. The distance between the tip of the force bone 11 and the wall panel material 117 is preferably about 3 mm, but it may be increased or decreased depending on the separation distance.

When the wall base material 7 and the force bone 11 are joined and fixed, a base material of sprayed rock wool 15 that is stronger and the force bone 11 does not damage the wall panel material 117 can be formed.
Further, since the force bone 11 is in contact with the outer surface of the second flange 7b of the wall base material 7, space is maintained between the fireproof coating base material 13 and the wall base material 7. In this part, sprayed rock wool 15 is additionally sprayed to be compacted. That is, at the joint between the wall panel material 117 and the sprayed rock wool 15 (fireproof coating material), the fireproof coating base material 13 is included in the sprayed rock wool 15 and is applied at a high density. As a result, the joint portion, which is a weak point in terms of fire resistance, can be formed more firmly.

[Embodiment 3]
In the third embodiment, as opposed to the synthetic coated fireproof structures 1 and 39 in the first and second embodiments, the wall structure is fireproof between the upper surface of the convex portion 93 and the lower surface of the concave portion 95 in the void portion. The material 19 is arranged at least in a width equal to or larger than the projection range of the square steel pipe column 3 so as to further improve the fire resistance.
Hereinafter, the wall body 41 of the present embodiment will be described with reference to FIGS. 5 and 6. Since the wall panel material 117 of the present invention in FIGS. 5 and 6 is the same as that shown in FIG. 7, the same parts and the corresponding parts are designated by the same reference numerals.

Since the wall panel material 117 is made of an extruded cement plate, it has a property of rapidly shrinking due to decomposition of cement components when a predetermined temperature is reached by heating. Therefore, when the heating time is long, the horizontal joints are greatly opened due to heat shrinkage.
Therefore, when constructing the wall panel material 117, the refractory material 19 is arranged in advance inside the horizontal joint as a joint treatment material.

As the refractory material 19, a rock wool blanket, an alkaline earth silicate blanket, a ceramic fiber blanket, and a heat-expandable sheet are also suitable. As shown in FIG. 5 (b), the thickness is compressed and filled so as to be equal to or greater than the height of the space inside the horizontal joint (see FIG. 5 (a)), but this is not the case for the heat expansion sheet, and after foaming. You may plan to fill the interior space.

The construction range of the refractory material 19 is at least the width of the square steel pipe column 3. As a result, the thermal resistance of the wall body 5 facing the square steel pipe column 3 is improved, and even if the wall panel material 117 is thermally shrunk and the horizontal joint is expanded by about 5 mm, hot air is prevented from flowing into the indoor side. can do.

[Embodiment 4]
This embodiment is more desirable than the third embodiment. In the arrangement of the refractory material 19 inside the horizontal joint, when the height of the horizontal joint is increased due to the heat shrinkage of the wall panel material 117, the refractory material 19 is used. However, it follows the wall panel material 117 and is not separated from the convex portion 93. Specifically, a method of making the side surface of the concave portion 95 and the side surface of the refractory material 19 non-contact, a method of adhering to the convex portion 93, and a combined use thereof. By arranging the upper wall panel material 117 so as not to follow it, as shown in FIG. 6, even if the sealing material 97 is burnt down and the horizontal joint opens above the height of the convex portion 93, the entire refractory material 19 Does not move upward and is left on the convex portion 93, and the refractory material 19 does not allow the lateral joints to penetrate in the front view, so that it is possible to suppress the invasion of flames.
Due to these actions, the synthetic-coated fire-resistant structure 1 of the steel pipe column of the present embodiment can further suppress the decrease in the heat-shielding property of the synthetic fire-resistant portion as compared with the first to third embodiments, and can improve the fire-resistant performance.

1 Synthetic coating fireproof structure of steel pipe columns (Embodiment 1)
3 Square steel pipe column 5 Wall body 7 Wall base material 7a First flange 7b Second flange 9 Connecting material 9a One side part 9b The other side part 11 Bolt 13 Fireproof coating base material 15 Sprayed rock wool 19 Fireproof material 25 Fastener 27 Steel plate 29 Bolt 31 Flat nut 35 Angle piece 39 Synthetic coating fireproof structure of steel pipe column (Embodiment 2)
41 Wall body (Embodiments 3 and 4)
<Conventional example>
91 Opening 93 Convex 95 Concave 97 Sealing material 99 Backup material 103 Steel pipe column 107 Ruler angle 109 Bracket 111 Rigid bone 113 Lath net 115 Sprayed rock wool 117 Wall panel material 125 Fastener

Claims (4)

It is a synthetic coating fireproof structure of steel pipe columns that fireproofly coats square steel pipe columns with walls and sprayed rock wool.
A wall body arranged in front of the square steel pipe column, a pair of wall base materials arranged on the surface of the wall body on the side of the square steel pipe column to fix the wall body, and one end of the wall base material. A pair of connecting members made of an angle member which is connected to a material and the other end is connected to the square steel pipe column directly or via a member to connect the wall base material and the square steel pipe column, and both sides of the square steel pipe column. A force bone provided so as to extend from a surface toward the wall body, and a fireproof coating fixed to the force bone and arranged so as to extend from both side surfaces of the square steel pipe column to the wall body. A base material, the fireproof coating base material, and sprayed rock wool sprayed on three surfaces other than the wall-side surface of the square steel pipe column are provided.
The pair of connecting members are arranged so that the inner surface sides face each other and one surface portion forming the ridge angle portion thereof is on an extension line of the side surface of the square steel pipe column.
The pair of wall base materials are made of an angle material continuous in the height direction, one face portion forming the ridge angle portion thereof is brought into contact with the wall body, and the back surface of the other face portion is one face portion of the connecting material. Fixed to
The strength bone is fixed by bringing the side portion on one end side into contact with the side surface of the square steel pipe column, and the other end is set to a length up to or near the tip of the flange forming the other surface portion of the wall base material. Being done
A fireproof coating base material is arranged on at least the outer surface of the force bone, and the fireproof coating base material is arranged on the back surface and both side surfaces of the square steel pipe column, the fireproof coating base material, and the other surface portion of the wall base material to the wall body. A synthetic coated fireproof structure of a steel pipe column, characterized in that the sprayed rock wool is arranged over the entire surface. It is a synthetic coating fireproof structure of steel pipe columns that fireproofly coats square steel pipe columns with walls and sprayed rock wool.
A wall body arranged in front of the square steel pipe column, a pair of wall base materials arranged on the surface of the wall body on the side of the square steel pipe column to fix the wall body, and one end of the wall base material. A pair of connecting members made of an angle member which is connected to a material and the other end is connected to the square steel pipe column directly or via a member to connect the wall base material and the square steel pipe column, and both sides of the square steel pipe column. A force bone provided so as to extend from a surface toward the wall body, and a fireproof coating fixed to the force bone and arranged so as to extend from both side surfaces of the square steel pipe column to the wall body. The base material, the fireproof coating base material, and the sprayed rock wool sprayed on three surfaces other than the wall-side surface of the square steel pipe column are provided.
The pair of connecting members face each other on the inner surface side, and one surface portion forming the ridge angle portion thereof is arranged so as to be shifted toward the column core side from the extension line of the side surface of the square steel pipe column.
The pair of wall base materials are made of angle members that are continuous in the height direction, and one surface portion forming the ridge angle portion thereof is brought into contact with the wall body, and the outer surface of the other surface portion is the side surface of the square steel pipe column. It is arranged so as to be on an extension line, and the inner surface of the surface portion is fixed to one surface portion of the connecting member.
In the force bone, one end side is brought into contact with the side surface of the square steel pipe column to be fixed, and the other end is brought into contact with the other face portion of the wall base material, and in a non-contact state with the wall body. Placed,
A fireproof coating base material is arranged on at least the outer surface of the force bone, and the fireproof coating base material is arranged on the back surface and both side surfaces of the square steel pipe column, the fireproof coating base material, and the other surface portion of the wall base material to the wall body. A synthetic coated fireproof structure of a steel pipe column, characterized in that the sprayed rock wool is arranged over the entire surface. The wall body is a wall panel material in which a convex portion continuous over the entire length is formed on the upper end surface, and a continuous concave portion wider than the width of the convex portion is formed on the lower end surface over the entire length. The horizontal joints between the upper and lower wall panel materials that are laminated and arranged in the vertical direction are not the convex part of the upper part of the wall panel material and the concave part of the lower part of the wall panel material. It has a gap held in contact and has a gap.
The synthetic coating of the steel pipe column according to claim 1 or 2, wherein the refractory material is arranged between the upper surface of the convex portion and the lower surface of the concave portion in the gap portion with a width at least equal to or larger than the projection range of the square steel pipe column. Fireproof structure. The refractory material is arranged in a non-contact state with the side surface inside the recess inside the lower part of the upper wall panel, and / or is fixed to the convex portion of the upper part of the lower wall panel, and the refractory material is attached to the upper wall panel. The synthetic coated fireproof structure of a steel pipe column according to claim 3, wherein the steel pipe column is not made to follow.

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