JP2022043330A - Synthetic coating fireproof structure of steel colum and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic coating fireproof structure capable of preventing hot air from flowing into a space (void portion) surrounded by a fireproof covering material, a wall body and a steel frame column, and ensuring fireproof performance, and a construction method thereof.

SOLUTION: A wall body 7 having fire resistance is attached to one side surface of a steel frame column 3 via a mounting member 5, and a fireproof covering material 9 is arranged on the other side surface and extends to the wall body side to abut, so that the outer periphery of the steel column is covered with the wall body and the fireproof covering material. In the wall body, wall panels 35 having a convex protrusion on the upper end surface and a concave fitting portion wider than the protrusion on the lower end surface are laminated in the height direction via a horizontal joint portion 11. In the horizontal joint portion, the protrusion on the upper end surface of the lower wall panel and the inner surface of the concave fitting portion on the lower end surface of the upper wall panel have a gap portion. In the joint portion between the wall body and the fireproof covering material, in the horizontal joint portion, a fireproof material 13 that can be consolidated is arranged on the upper surface of the protrusion and the portion on the steel frame column side in the gap portion around the protrusion over a length equal to or longer than the contact width of the fireproof covering material.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a fire-resistant structure of a steel column, and in particular, a synthetic-coated fire-resistant structure of a steel column in which a wall panel of a vertical fitting method is laminated to form a wall body and the wall body is utilized as a part of the fire-resistant coating. It is about the construction method.
In the following description, when the direction is defined based on the position of the wall body (wall panel), the side where the steel frame column (steel pipe column) is located is defined as the indoor side, and the opposite side is defined as the outdoor side.

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. is 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 material, it is difficult to construct the fireproof coating on the portion facing the wall material. Therefore, the steel column using the fireproof wall material as a part of the fireproof coating. There is a synthetically coated fireproof structure.
In such a synthetic coating fireproof structure, the separation distance between the wall material and the steel frame column is often 200 mm or less, and the fireproof coating material is arranged by extending the separation portion from the side surface of the steel frame column toward the wall material. The construction of the fireproof coating in the separated portion is omitted (see, for example, Patent Document 1).
As the wall material, ALC board (lightweight cellular concrete board cured by high temperature and high pressure steam), PC board (precast concrete board), extruded cement board, calcium silicate board mixed with fiber, gypsum board and the like are used.

Further, for example, as disclosed in Non-Patent Document 3, an extruded cement plate, which is a wall material having fire resistance, is used as a part of the fire resistant coating of a steel column together with sprayed rock wool, which is a fire resistant coating material. There is also a synthetic coated fireproof structure to be utilized.
In this structure, a wall material is attached to one side surface of the steel frame column via mounting hardware, and sprayed rock wool is applied to the surface of the steel frame column other than the side surface facing the wall material.
In this structure, there will be a gap between the steel column and the wall material, but in the part where this space is left, a lath net is attached to the reinforcing bar made of reinforcing bars extending from the steel column to the wall material. Sprayed rock wool is applied as a base material for fireproof coating. 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 extruded cement board used for the above wall material (wall panel) is made by extruding a paste obtained by adding water to cement, silicic acid raw material, organic fiber, and organic admixture, and then performing steam curing after primary curing. It is manufactured by cutting the size to develop a predetermined strength.
Generally, a plurality of longitudinally continuous cavities are arranged adjacent to each other, and the short side has a plurality of openings. One end surface of the long side has a continuous convex protrusion, and the other end surface has a corresponding concave fitting part, and when used as a horizontal stretch of a wall panel, the one end surface with the protrusion is the upper side. , The concave fitting portion is arranged so as to be the lower side, a horizontal joint is formed, and the wall panel is formed by laminating upward. In consideration of deformation during an earthquake, the horizontal joint has a gap of about 10 to 15 mm, and the protrusion on the upper part of the lower wall panel and the inner surface of the concave fitting part on the lower part of the upper wall panel are not on either side. It is common to arrange and fix it so that it is in contact with each other. The outdoor side of the horizontal joint is waterproofed with a sealing material, and the indoor side is provided with a gasket as needed, but in many cases it is not treated.

Non-Patent Document 4 is an extruded cement board / a fiber-mixed calcium silicate board synthetic coated steel pipe column, and is an extruded cement which is a wall material having fire resistance together with a fiber-mixed calcium silicate board which is a fire-resistant coating material. The plate is used as part of the fireproof coating of the steel column. In this structure as well, as in Non-Patent Document 3, the steel frame column and the wall material are spaced apart from each other, and the fiber-mixed calcium silicate plate is directly stretched on the steel frame column or is floated by attaching a spacer to make the wall material. It is to be extended toward the construction. This structure has also been confirmed for its performance by a performance evaluation test conducted based on predetermined conditions, and has been certified by the Minister of Land, Infrastructure, Transport and Tourism as stipulated in Article 2, Item 7 of the Building Standards Act.
The performance evaluation test for the above certification is to verify the structural safety by installing the test piece in the heating furnace and heating it at the standard heating temperature of ISO834 with the long-term load of the column loaded. The four sides (the entire surface of the extruded cement board and the refractory coating) are heated.

Japanese Unexamined Patent Publication No. 9-100587

Minister of Land, Infrastructure, Transport and Tourism certificate FP060CN-9460 (sprayed rock wool coated steel column) Minister of Land, Infrastructure, Transport and Tourism certificate FP120CN-9463 (sprayed rock wool coated steel column) Minister of Land, Infrastructure, Transport and Tourism certification FP060CN-0539 (extruded cement board / sprayed rock wool synthetic coated steel pipe column) Minister of Land, Infrastructure, Transport and Tourism certification FP120CN-0122 (extruded cement board / fiber mixed calcium silicate board synthetic coated steel pipe column)

The problems of the synthetic refractory coating structure of the steel frame column in Non-Patent Documents 3 and 4 will be described.
The upper and lower wall panels tend to shrink with the progress of heating, and the joint width tends to expand up and down. Further, as described above, the horizontal joint portion is generally provided with a gasket on the indoor side as shown in FIG. 1 perspective view of Non-Patent Document 3, but may be untreated.

When a fire resistance test was conducted on the synthetic coated refractory structure of Non-Patent Document 3, the sealing material was left behind against heating from the outdoor side, and a large inflow path of hot air was not formed, but a gasket was arranged on the indoor side. When heating is performed for longer than the required fire resistance time of Non-Patent Document 3, the air gap portion surrounded by the wall panel, the fire resistant coating material, and the steel pipe column due to the hot air flowing into the inside from the horizontal joint portion. It was found that there was a problem that the temperature of the refrigerator increased significantly.

Therefore, when the required fire resistance time becomes long, as shown in FIGS. 1 and 3 of Non-Patent Document 4, the fireproof coating of the horizontal joint portion on the indoor side (the portion where the gasket shown in FIG. 1 of Non-Patent Document 3 is arranged) is fireproof. A ceramic fiber blanket with a height of 20 mm (compression filling to a joint height of 15 mm) x depth (horizontal joint depth) of 10 mm x width (covering material thickness) of 25 mm can be arranged at the intersection with the joint. It is shown. The construction of the joint treatment material is performed after the wall panel is constructed and prior to the fireproof coating construction.

6 and 7 are views for explaining the synthetic coating fireproof structure shown in Non-Patent Document 4, and FIG. 6 describes a state in which the upper panel of the horizontal joint portion is removed for convenience of explanation. There is. 3 is a steel column, 9 is a fireproof coating material made of a fiber-mixed calcium silicate board, and 35 is a wall panel made of an extruded cement board. The wall panel 35 is separated from the steel pillar 3 by a mounting member 5 at a predetermined distance. It is attached and constitutes the wall body 7. The refractory covering material 9 provided on the side surface of the steel frame column 3 orthogonal to the wall body 7 extends from the side surface of the steel frame column 3 toward the wall body 7, and its tip surface is in contact with the wall body 7.
In the horizontal joint portion 11, the joint portion treatment material 41 made of the above-mentioned ceramic fiber blanket is applied to the contact portion between the tip surface of the fireproof coating material 9 and the wall body 7.

As described above, the horizontal joint portion 11 is not completely fitted, and there is a gap in the uneven portion inside the horizontal joint portion 11 of the wall body 7, and the connecting portion of the upper and lower wall panels 35 has a gap. , The gap is continuous in the horizontal direction. Therefore, as shown in FIG. 7A, the joint portion is processed only on the indoor side joint portion 11 (the lower end of the indoor side wall forming the concave fitting portion of the lower end surface of the upper wall panel 35). Even if the material 41 is arranged, the portion adjacent to the portion where the joint treatment material 41 is arranged (the portion displaced in the horizontal joint direction) is the inside and the wall of the horizontal joint portion 11 as shown in FIG. 7 (b). It is in a state of being in communication with the space on the indoor side of the body 7. In the example shown in FIG. 7, the sealing material 27 is arranged in the gap on the outdoor side of the horizontal joint portion 11.

Since the horizontal joint portion 11 has an upper and lower gap, the space S surrounded by the refractory covering material 9, the wall body 7, and the steel frame column 3 and the horizontal joint portion 11 are also in a state of communicating with each other.
Therefore, as shown by the arrow in FIG. 6, the flow path of hot air from the space on the indoor side of the wall body 7 and outside the fireproof covering material 9 to the space S via the inside of the horizontal joint portion 11 exist. Since the thermal resistance of the wall panel 35 alone is larger than that of the fireproof coating material 9, normally, the temperature of the steel material is suppressed in the synthetic coating fireproof structure as compared with the fireproof structure of the column alone, but from the horizontal joint portion 11. Due to the inflow of hot air, the temperature of the steel material on the side facing the space S may rise significantly depending on the thickness of the fireproof coating material 9 and the cross-sectional dimensions of the steel frame column 3, leading to collapse.

The present invention has been made to solve such a problem, and in a synthetic-coated fire-resistant structure in which a steel column is surrounded by a fire-resistant coating material and a wall panel, hot air is applied to the fire-resistant coating material, the wall body, and the steel frame. It is an object of the present invention to provide a synthetic coated fireproof structure capable of preventing inflow into a space (void portion) surrounded by pillars and ensuring fireproof performance, and a construction method thereof.

(1) In the synthetic coating fireproof structure of a steel frame column according to the present invention, a wall body having fire resistance is attached to one side surface of the steel frame column via an attachment member, and a fireproof coating material is attached to the other side surface of the steel frame column. The fireproof coating material is arranged and the fireproof coating material extends toward the wall body side and comes into contact with the steel frame column so that the outer peripheral portion of the steel frame column is covered with the wall body and the fireproof coating material.
The wall body has a wall panel having a convex protrusion over the entire length on the upper end surface and a concave fitting portion having a wider width than the protrusion on the lower end surface over the entire length. It is laminated in the height direction,
The horizontal joint has a gap portion in which the protrusion on the upper end surface of the lower wall panel and the inner surface of the concave fitting portion on the lower end surface of the upper wall panel are in a non-contact state.
In the joint portion between the wall body and the fireproof coating material, the horizontal joint portion is formed by covering the upper surface of the protrusion and the portion on the steel frame column side with the fireproof material that can be consolidated. It is characterized in that it is arranged over a length equal to or longer than the contact width of the material.

(2) Further, in the above-mentioned (1), in the horizontal joint portion, the upper end surface of the lower wall panel and the lower end surface of the upper wall panel are separated from each other, and the two are not in direct contact with each other. It is characterized by that.

(3) The method for constructing a synthetically coated fireproof structure for steel columns according to the above (1) or (2).
When the compactable refractory material is attached to the protrusion of the lower wall panel and the fitting portion of the upper wall panel is fitted to the protrusion, the fireproof material is partially sheared and broken. It is characterized by compactly filling the voids.

(4) The method for constructing a synthetically coated fireproof structure for steel columns according to the above (1) or (2).
The fireproof material is attached to the concave fitting portion of the upper wall panel, and the fitting portion of the upper wall panel is fitted to the protrusion of the lower wall panel. It is characterized in that a part of the material is consolidated and filled in the void portion while being sheared and broken.

In the synthetically coated fire-resistant structure of the steel frame column according to the present invention, in the joint portion between the wall body and the fire-resistant covering material, the horizontal joint portion is formed on the upper surface of the protrusion and the portion on the steel frame column side in the voids around the protrusion. By arranging the refractory refractory material that can be compacted over a length longer than the contact width of the refractory coating material, the space surrounded by the wall body, the refractory coating material, and the steel frame column is externally formed through the horizontal joint. The path through which hot air flows in is blocked, which has the effect of reliably ensuring the fire resistance performance of the synthetically coated fire resistant structure of the steel frame column.

It is explanatory drawing of the synthetic cover fireproof structure of the steel frame column which concerns on Embodiment 1, and is the horizontal sectional view of the side joint portion. It is a vertical cross-sectional view of the part circled by the broken line of FIG. It is explanatory drawing of the construction method of the synthetic cover fireproof structure of the steel frame column which concerns on Embodiment 2. FIG. It is explanatory drawing of the construction method of the synthetic cover fireproof structure of the steel frame column which concerns on Embodiment 3. FIG. It is explanatory drawing of the construction method of the synthetic cover fireproof structure of the steel frame column which concerns on Embodiment 4. FIG. It is explanatory drawing explaining the problem of the conventional example. It is a vertical cross-sectional view of the part circled by the broken line of FIG. 6, FIG. 7 (a) is a part where a refractory covering material and a wall body abut, and FIG. 7 (b) is a part adjacent to it.

[Embodiment 1]
An embodiment of a synthetically coated fireproof structure for a steel frame column according to the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment.
In the synthetically coated fireproof structure 1 of the steel frame column according to the present embodiment, as shown in FIGS. 1 and 2, a wall body 7 having fire resistance is attached to one side surface of the steel frame column 3 via a mounting member 5. A fireproof coating material 9 is arranged on the other side surface of the steel frame column 3, and the fireproof coating material 9 extends toward the wall body 7 side and abuts on the other side surface of the steel frame column 3, so that the outer peripheral portion of the steel frame column 3 is fireproof coated with the wall body 7. It is covered with a material 9.
Further, in the joint portion between the wall body 7 and the fireproof coating material 9, the fireproof material 13 that can be consolidated is arranged in the horizontal joint portion 11 over a length equal to or larger than the contact width of the fireproof coating material 9. Is to be.
Hereinafter, the details of each constituent member constituting the synthetic coated fireproof structure 1 will be described.

<Steel column>
The example shown in FIG. 1 is a square steel pipe column (□ -300 × 300 × 9), but the shape and dimensions of the steel frame column 3 of the present invention are not particularly limited. Therefore, circular steel pipe columns and columns made of shaped steel are also included.
In the following description, on the premise of the square steel pipe column shown in FIG. 1 (hereinafter, simply referred to as “steel pipe column”), the plane orthogonal to the wall body 7 of the steel pipe column is defined as the side surface. Therefore, in the following description, the steel pipe columns will be described with the same reference numerals as those of the steel frame columns 3.

<Mounting member>
The mounting member 5 sandwiches the base steel material 15 having a rectangular cross section provided so as to project toward the wall body 7 on the surface of the steel pipe column 3 facing the wall body 7, and the base steel material 15 on both side surfaces of the base steel material 15. A pair of angle members 17 (hereinafter referred to as "regular angle 17") having a length extending over the entire length of the steel pipe column 3 and one end side thereof are fixed to the wall body 7 by bolts 19 and flat nuts 21. It is composed of a steel plate 23 (commonly known as Z hardware) that holds a piece of the ruler angle 17 on the other end side in cooperation with the wall body 7. Generally, the ruler angle 17 and the steel plate 23 are finally welded and fixed.

The dimensional shape and mounting form of the base steel material 15 can be arbitrarily set according to the separation distance between the steel pipe column 3 and the wall body 7.
As the ruler angle 17, 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 the example shown in FIG. 1 is L-50 × 50 × 6.
The separation distance between the steel pipe column 3 and the wall body 7 is usually 25 mm or more, but in the example shown in FIG. 1, the separation distance is set to be greater than or equal to the ruler angle 17, and therefore, in the present embodiment, the separation distance is set. The applicable range is 50 mm or more as the distance.

As shown in FIG. 1, the pair of ruler angles 17 are arranged so as to straddle the vertical joint portion 25 of the wall panel 35, and the vertical joint portion 25 includes a sealing material 27 and a fireproof backup material. 29 is arranged.

<Wall body>
The wall body 7 has fire resistance and is attached to one side surface of the steel frame column 3 via an attachment member 5. That is, the mounting method of the wall body 7 is the same as the horizontal stretching method in which the pillars or studs are fixed by using fasteners.
Further, the wall body 7 has a wall panel 35 having a convex protrusion 31 over the entire length on the upper end surface and a concave fitting portion 33 having a wider concave shape than the protrusion 31 on the lower end surface over the entire length. It is laminated in the height direction via the horizontal joint portion 11.
In the horizontal joint portion 11, the protrusion 31 on the upper end surface of the lower wall panel 35 and the inner surface of the concave fitting portion 33 on the lower end surface of the upper wall panel 35 are fitted on the entire peripheral surface of the protrusion 31. It is non-contactly fitted to the inner surface of 33, and therefore has a gap on the outer periphery of the protrusion 31.
Further, the horizontal joint portion 11 of the present embodiment is arranged at intervals of 10 mm as the horizontal joint height when the wall panels 35 are laminated in the vertical direction, and the sealing material 27 is formed in the gap on the outdoor side after the lamination. Is arranged.

Taking an extruded cement plate having a thickness of 60 mm as an example of the material of the wall panel 35, the protrusion 31 has a height of 18 to 20 mm and a width of 24 to 26 mm, and the fitting portion 33 has a depth of 18 to 20 mm and a width of 30. It is ~ 34 mm, and has a gap portion of 10 to 12 mm upward and 3 to 4 mm on each side on the outer periphery of the protrusion 31.

<Fireproof coating material>
The fireproof coating material 9 is provided so as to cover the side surface and the indoor side surface of the steel pipe column 3, and the fireproof coating material 9 provided on the side surface of the steel pipe column 3 extends to the wall body 7 side and its tip surface is a wall. It is in contact with the body 7. As a result, the outer peripheral portion of the steel pipe column 3 is covered with the wall body 7 and the refractory covering material 9.
The method for fixing the refractory covering material 9 is not particularly limited, and the fireproof covering material 9 may be arranged in contact with a surface other than the surface portion facing the wall 7 on the surface of the steel pipe column 3 or may be arranged with a space.

The fireproof coating material 9 shown in FIG. 1 is a calcium silicate plate having a thickness of 25 mm, but the material of the fireproof coating material 9 of the present invention is not particularly limited, and is sprayed, blanket-shaped, plate-shaped, or the like. Any form is included, and any material having fire resistance such as rock wool, ceramic wool, cement-based, gypsum-based, and calcium silicate-based can be applied.

<Fireproof material that can be consolidated>
In the joint portion (contact portion) between the wall body 7 and the fireproof coating material 9, the fireproof material 13 that can be consolidated is the upper surface of the protrusion 31 and the steel column 3 side (of the gaps around the protrusion 31 in the horizontal joint portion 11). The refractory material 13 is arranged on the indoor side) over a length equal to or longer than the contact width of the refractory coating material 9 (see FIGS. 1 and 2).
As a result, as shown in FIG. 6, the wraparound of hot air is blocked (see FIG. 1), and the hot air does not flow into the space S surrounded by the wall body 7, the refractory covering material 9, and the steel pipe column 3. ..

The example shown in FIG. 1 as the compactable fireproof material 13 is an alkaline earth silicate blanket, but the compactable fireproof material 13 of the present invention is assumed to be rock wool, ceramic wool, ceramic fiber, or alkaline earth silicate. , Blanket, felt, matte processed, as well as sprayed rock wool.

As described above, according to the synthetic coating fireproof structure 1 of the present embodiment, in the joint portion between the wall body 7 and the fireproof coating material 9, among the voids around the protrusion 31 in the horizontal joint portion 11, the upper surface of the protrusion 31 By disposing the refractory material 13 in the portion on the steel column 3 side over a length equal to or longer than the contact width of the refractory covering material 9, the wraparound of hot air is blocked (see FIG. 1), and the hot air is in the space S. It is possible to improve the fire resistance performance without flowing into.

In the above embodiment, the walls on both sides of the recess of the concave fitting portion 33 in the upper wall panel 35 do not abut on the bottom walls on both sides of the lower protrusion 31, and the lateral joint portion 11 It was an example in which a gap was formed in. Therefore, the sealing material 27 is disposed in the gap on the outdoor side, and the refractory material 13 that can be consolidated is disposed in the gap on the indoor side.
However, in the present invention, the walls on both sides of the concave fitting portion 33 may be in direct contact with the bottom walls on both sides of the lower protrusion 31. In this case, the refractory material 13 that can be consolidated may be disposed on the upper surface of the protrusion 31 and the side surface on the steel pipe column 3 side.

[Embodiment 2]
The construction method of the synthetic coating fireproof structure 1 described in the first embodiment will be described with reference to FIG.
As shown in FIG. 3A, the fire-resistant material 13 that can be consolidated is previously attached to the upper surface of the protrusion 31 on the upper end surface of the lower wall panel 35 with an adhesive. At this time, the outdoor end of the refractory material 13 is at the same position as the outdoor wall of the protrusion 31, and the indoor end is extended inward from the indoor wall of the protrusion 31. deep.

Next, as shown in FIG. 3B, by fitting the lower end surface of the upper wall panel 35, the refractory material 13 made of, for example, an alkaline earth silicate blanket extends from the upper surface of the protrusion 31 to the indoor side. The portion that has been consolidated is compactly filled in the gap adjacent to the indoor side surface of the protrusion 31 while being sheared and broken. After filling, as shown in FIG. 2, the protrusion 31 is filled in the upper surface, the gap on the indoor side surface of the protrusion 31, and the gap below the indoor wall of the fitting portion 33.
The extension dimension of the refractory material 13 attached to the upper surface of the protrusion 31 to the indoor side may be made longer (for example, the position of the indoor side surface of the wall panel 35), and the extra length may be cut after construction. ..

When the walls on both sides of the concave fitting portion 33 of the upper wall panel 35 directly abut on the bottom walls on both sides of the protrusion 31 of the lower wall panel 35, it is an extension when the refractory material 13 is attached. Keep the dimensions shorter than in the example above. As a result, the refractory material 13 can complete the filling process without being sandwiched in the horizontal joint portion 11. In this case, the extension dimension of the refractory material 13 to the indoor side is, for example, a length that exceeds the gap on the side surface of the protrusion 31 and does not exceed 1/2 of the horizontal joint depth.

According to the construction method of the present embodiment, the fireproof material 13 that can be consolidated can be easily and surely arranged at the portion of the horizontal joint portion 11 where the flow path of hot air should be blocked, and the first embodiment. The synthetic coating refractory structure 1 shown in the above can be realized.

[Embodiment 3]
When the refractory material 13 that can be consolidated is attached to the upper surface of the protrusion 31, the refractory material 13 is not extended to the indoor side, but is aligned with the side surface of the protrusion 31 on the indoor side as shown in FIG. 4 (a). You may paste it.
In this case, as shown in FIG. 4B, by fitting the upper wall panel 35, the portion arranged on the upper surface of the protrusion 31 is compacted, and the portion arranged on the side surface of the protrusion 31 is formed. While being sheared, it is filled into the gap adjacent to the indoor side surface of the protrusion 31.
By attaching the refractory material 13 along the indoor side surface of the protrusion 31 in this way, the refractory material 13 can be arranged in the horizontal joint portion 11 in a more compacted state, and the inflow of hot air can be achieved. Can be prevented more reliably.

[Embodiment 4]
The present embodiment relates to another method of the construction method of the synthetic coated fireproof structure 1 described in the first embodiment, and will be described with reference to FIG.
As shown in FIG. 5A, the fire-resistant material 13 that can be consolidated is previously attached to the concave fitting portion 33 of the lower end surface of the upper wall panel 35 with an adhesive. At this time, the outdoor end of the refractory material 13 is brought into contact with the outdoor wall of the recess, and the indoor end is arranged so as to extend to at least a position along the vertical surface of the indoor side of the recess. In the example shown in FIG. 5A, the upper wall panel 35 is arranged so as to extend to the lower end surface on the indoor side.

Next, as shown in FIG. 5B, by fitting the lower end surface of the upper wall panel 35, the refractory material 13 made of, for example, an alkaline earth silicate blanket is sheared and broken while the indoor side surface of the protrusion 31 is formed. It fills in the gap adjacent to. In the construction completed state, the state shown in FIG. 2 is obtained.
In this construction method, a construction method having a thickness equal to or higher than the height of the horizontal joint and 1.5 times or less the height thereof is used. If it becomes thicker than that, the workability will decrease, so care must be taken.

Also in this embodiment, the same effects as those in the above-described embodiments 2 and 3 can be obtained.
When the walls on both sides of the concave fitting portion 33 of the upper wall panel 35 directly abut on the bottom walls on both sides of the protrusion 31 of the lower wall panel 35, it is an extension when the refractory material 13 is attached. The dimensions should be shorter than in FIG. 5A so as not to reach the lower end surface of the wall panel 35.
The optimum length that can complete the filling process without being pinched in the horizontal joint portion 11 differs depending on the dimensions of the protrusion 31 of the lower wall panel 35 and the fitting portion 33 of the upper wall panel 35, and is appropriately adjusted. To decide. However, the extension dimension to the indoor side shall be a length that exceeds the gap on the side surface of the protrusion 31 and does not exceed 1/2 of the horizontal joint depth.

1 Synthetic coating fireproof structure 3 Steel column (steel pipe column)
5 Mounting member 7 Wall body 9 Fireproof coating material 11 Horizontal joint part 13 Fireproof material 15 Base steel material 17 Angle material (ruler angle)
19 Bolt 21 Flat nut 23 Steel plate 25 Vertical joint 27 Sealing material 29 Fireproof backup material 31 Protrusion 33 Fitting part 35 Wall panel 41 Joint treatment material S Space

Claims (4)

A wall body having fire resistance is attached to one side surface of the steel frame column via a mounting member, a fire resistant coating material is arranged on the other side surface of the steel frame column, and the fire resistant coating material extends toward the wall body side. It is a synthetically coated fireproof structure of a steel frame column in which the outer peripheral portion of the steel frame column is covered with the wall body and the fireproof coating material.
The wall body has a wall panel having a convex protrusion over the entire length on the upper end surface and a concave fitting portion having a wider width than the protrusion on the lower end surface over the entire length. It is laminated in the height direction,
The horizontal joint has a gap portion in which the protrusion on the upper end surface of the lower wall panel and the inner surface of the concave fitting portion on the lower end surface of the upper wall panel are in a non-contact state.
In the joint portion between the wall body and the fireproof coating material, the horizontal joint portion is the fireproof coating of the fireproof material that can be consolidated on the upper surface of the protrusion and the portion on the steel frame column side among the gaps around the protrusion. A synthetically coated fireproof structure of steel columns characterized by being arranged over a length greater than the contact width of the material. The composition of the steel frame column according to claim 1, wherein the upper end surface of the lower wall panel and the lower end surface of the upper wall panel are separated from each other in the horizontal joint portion so that they are not in direct contact with each other. Covered fireproof structure. The method for constructing a synthetically coated fireproof structure for steel columns according to claim 1 or 2.
When the compactable fireproof material is attached to the protrusion of the lower wall panel and the fitting portion of the upper wall panel is fitted to the protrusion, the fireproof material is partially sheared and broken. A method for constructing a synthetically coated fireproof structure for steel columns, which is characterized by consolidation in the voids. The method for constructing a synthetically coated fireproof structure for steel columns according to claim 1 or 2.
The fireproof material is attached to the concave fitting portion of the upper wall panel, and the fitting portion of the upper wall panel is fitted to the protrusion of the lower wall panel. A method for constructing a synthetically coated fireproof structure for steel columns, which comprises compacting the voids while shearing a part of the material.

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