JP7010269B2 - Wall structure - Google Patents

Description

The present invention relates to a wall structure in which a plurality of nonflammable wall panels are arranged in the vertical direction or the horizontal direction, and particularly to a wall structure having improved heat-shielding property and flame-shielding property inside the joint. ..

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. As the wall material of the fireproof structure, ALC board (lightweight cellular concrete board cured by high temperature and high pressure steam), PC board (precast concrete board), calcium silicate board mixed with fiber, gypsum board, etc. are used, but extruded cement board. Can also construct a wall of fireproof structure.

Extruded cement board (wall panel) is made by extruding a paste made by adding water to cement, silicic acid raw material, organic fiber, and organic admixture and kneading it. After primary curing, steam curing is performed to develop the specified strength. It is manufactured by cutting and cutting the size. Extruded cement plates generally have a plurality of longitudinally continuous cavities arranged adjacent to each other and a short side having a plurality of openings. In addition, one end surface of the long side has a continuous convex protrusion, and the other end surface has a corresponding concave fitting portion. In the case of horizontal tension, the protrusion is arranged as the upper surface to form a horizontal joint. To form a wall by stacking them in the vertical direction.

It is common to provide a gap of about 10 mm in the horizontal joint, and arrange and fix 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 so that they are not in contact with each other. It is a target. In order to improve fire resistance, the relevant part may be filled with a non-combustible material, but it is usually untreated. 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.

FIG. 9 shows a cross section of such a conventional wall structure 41 in the short side direction. As shown in FIG. 9, in the conventional wall structure 41, one wall has wall panels 3A and 3B having a concave portion 5A continuous on one long side and a convex portion 7B formed on the other long side. A joint portion is formed by providing a gap portion in which both the concave portion 5A of the panel 3A and the convex portion 7B of the other wall panel 3B are held in a non-contact state. A backup material 9 and a sealing material 11 are installed on the outdoor side.
As shown in FIG. 2 of Patent Document 1, the vertical stretch is similarly arranged continuously on the left and right with the long side of the wall panel as the vertical joint. The joint structure is the same as the horizontal joint shown in FIG.

Non-Patent Document 1 is a 1-hour fireproof structure outer wall certification document for a fiber-mixed calcium silicate cement extruded plank outer wall. Here, the specifications of the fitting joint are presented in the joint detailed view. In addition to the specification that the inside of the mating joint is hollow, the specification that rock wool felt, glass wool mat, rock wool heat insulating plate, and ceramic fiber felt are placed as non-combustible packing materials is also presented. ..

If it is difficult to apply a fireproof coating to a column or beam because it is close to the outer wall, a synthetic fireproof structure may be constructed that utilizes the outer wall as part of the fireproof coating. Non-Patent Document 2 shows a certified structure of extruded cement board / sprayed rock wool synthetic coated steel pipe column, and is extruded cement which is a wall material having fire resistance together with sprayed rock wool which is a fire resistant coating material. The plate is used as part of the fireproof coating of the steel column.

In this structure, the steel pipe column and the wall material are arranged at intervals, and the wall is supported by the column via a bracket (connecting material) with a ruler angle (wall base material) continuous in the height direction. There is. The fireproof coating on the side of the column is extended toward the wall, and a lath net is attached to the reinforcing bar made of reinforcing bars extending from the steel pipe column to the wall material to use as a base material for the fireproof coating, and sprayed rock wool is used. It is to be constructed.

This structure has been confirmed for its performance by a performance evaluation test conducted based on the prescribed 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 Law. The performance evaluation test for acquisition 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 pillar loaded. (The entire surface of the extruded cement board and fireproof coating) is heated.

Japanese Unexamined Patent Publication No. 2006-23458 Japanese Unexamined Patent Publication No. 2009-150147 Japanese Unexamined Patent Publication No. 2018-085021

Certificate of Minister of Land, Infrastructure, Transport and Tourism FP060NE-9037 (Fiber-mixed calcium silicate cement extruded plank outer wall) Minister of Land, Infrastructure, Transport and Tourism certificate FP060CN-0539 (extruded cement board / sprayed rock wool synthetic coated steel pipe column)

The walls used in the literature shown above have a non-bearing outer wall 1 hour fire protection. Further, the structure of Non-Patent Document 2 uses the wall, and a predetermined performance has been confirmed in the required fire resistance time.
On the other hand, in the Building Standard Law, the required fire resistance time is determined by the number of floors of the building, and there are 2 hours and 3 hours as the required fire resistance time for columns and beams, but the fireproof structure certification of the non-bearing wall is 1 hour. No further fire resistance is required.

When the synthetic fireproof structure is adopted, the outer wall is heated beyond the required fire resistance time, and when the heating exceeding the required fire resistance time of the outer wall is continued, the temperature of the wall panel exceeds a certain temperature. A large contraction occurs suddenly in the stage. One of the detailed joint views of Non-Patent Document 1 shows a form in which uneven portions are completely fitted, but in actual construction, in consideration of deformation during an earthquake, other detailed joint drawings and patent documents are shown. As shown in FIG. 2 of No. 1, it is supported in an incompletely fitted state. In this structure, since the fitting dimension of the convex portion of the panel is not large, when the sealing material is burnt down, an intrusion path of hot air is formed, but it is considered that the influence is not large as compared with the temperature of the wall panel.

However, when a large contraction occurs and the joint width expands, the tip of the convex portion does not reach the lower end of the concave portion, and a gap that penetrates linearly to the back surface is formed, external radiant heat can easily be released from the joint portion to the steel frame column or the steel frame column. Due to the increased inflow of hot air that reaches the beam, the temperature of the wall panel, the fireproof covering material, and the voids surrounded by the steel columns and beams rises significantly, depending on the thickness of the covering material and the cross-sectional dimensions of the steel tube columns. Although the degree is different, the temperature of the steel material on the side facing the void may rise significantly, leading to collapse.

As described above, the detailed joint view of Non-Patent Document 1 and FIG. 2 of Patent Document 2 also show the specification of arranging the non-combustible packing material in the relevant portion, but the heat resistant temperature of glass wool or rock wool is determined. If the temperature is low compared to the temperature inside the furnace and the joints expand to expose the non-combustible packing materials, they will melt and wear, and the time to penetration can be extended, but the joints will eventually penetrate. ..

When ceramic fiber is used, there is no problem with the heat-resistant temperature even in a red-hot state, and there is almost no wear. When the wall panel contracts, it is held on the concave side, and a gap is created with the tip of the convex portion. If it is placed with a margin in the recess, it cannot be held in place in the vertical stretch unless it is fixed to the tip of the convex part, and even in the horizontal stretch, it will not be restored from the compacted dimensions. There is a gap inside. In addition, since the heat capacity is large, it becomes a radiant heat source after the end of heating and contributes to the subsequent rise in the temperature of the steel material.

Patent Document 3 relates to a sealing material and a sealing structure between panels, and does not directly contribute to fire protection performance. However, here, the sealing material is arranged in a compressed state in a space formed by a convex portion and a concave portion. Further, it is attached to the upper surface of the convex portion with double-sided tape as a means for controlling misalignment. When this sealing material is replaced with a non-combustible packing material, these are inorganic fiber-based materials, and those having a size larger than the inner dimension in the thickness direction of the concave portion are arranged, so that the upper surface of the convex portion is adhered. It is obvious that it will peel off from the layer and cannot be simply replaced.

The present invention has been made to solve such a problem, and even when the outer wall is heated beyond the required fire resistance time and a large shrinkage occurs, the heat-shielding property and the flame-shielding property inside the joint are enhanced. It is an object of the present invention to provide a wall structure capable of blocking the intrusion route of hot air.

(1) The wall structure according to the present invention is made of a rectangular plate-like body, and a concave portion continuous in the longitudinal direction is formed on one end surface thereof, and the other end surface parallel to the one end surface is continuous in the longitudinal direction. A wall structure composed of a plurality of nonflammable wall panels in which a convex portion having a width narrower than the opening width of the concave portion is formed in combination with each other so as to insert the convex portion into the concave portion.
It has a hot air intrusion prevention metal fitting that is disposed inside a joint portion formed by inserting the convex portion into the concave portion to prevent hot air intrusion, and the hot air intrusion prevention metal fitting is formed on the web and both sides thereof. It has a flange and is provided with a U-shaped portion having a substantially U-shaped cross section along the axis, and the convex portion is fitted so as to be sandwiched between the flanges, and between the tip surface of the convex portion and the inner surface of the web. It is characterized in that it is arranged so as to have a gap portion in the space.

(2) Further, in the above-mentioned item (1), the web of the hot air intrusion prevention hardware fitted to the convex portion of one wall panel comes into contact with the deepest portion of the concave portion of the other wall panel. It is characterized by being.

(3) Further, in the above-mentioned item (2), the length of the flange in the hot air intrusion prevention metal fitting is from the dimension from the base of the convex portion of the wall panel to the deepest portion of the concave portion of the other wall panel. It is set to a large size, and is characterized in that it is compressed between mutual wall panels and held in an elastically deformed state inside the joint portion.

(4) Further, in the above-mentioned (2) or (3), in the hot air intrusion prevention hardware, the flange is slidably installed with the convex portion of one wall panel, and the web is the other. It is characterized in that it is joined to the deepest part of the recess of the wall panel.

(5) Further, in any of the above (1) to (4), the refractory coating material is arranged so as to face at least one surface of the steel frame column and is applied to the other surface of the steel frame column. It is characterized in that it is abutted or joined to form a synthetically coated fireproof steel column.

In the wall structure according to the present invention, there is a hot air intrusion prevention hardware that is disposed inside a joint formed by inserting a convex portion of the other wall panel into a concave portion of one wall panel to prevent hot air intrusion. The hot air intrusion prevention hardware has a web and flanges formed on both sides thereof, and has a U-shaped portion having a substantially U-shaped cross section perpendicular to the axis, and is fitted so as to sandwich the convex portion between the flanges. However, by being arranged so as to have a gap between the tip surface of the convex portion and the inner surface of the web, the hot air intrusion prevention hardware having the U-shaped portion has the height of the convex portion of the wall panel. Since it works to increase the heat insulation, it is possible to reduce the hot air intrusion route at the joint and improve the heat insulation and flame insulation inside the joint to block the hot air intrusion route without using a heat insulating material. can.

It is sectional drawing of the main part of the wall structure which concerns on Embodiment 1 of this invention. It is a perspective view of the wall panel used for the wall structure shown in FIG. It is explanatory drawing of the hot air invasion prevention hardware which concerns on this invention. It is sectional drawing of the main part of the wall structure which concerns on Embodiment 2 of this invention. It is explanatory drawing of the problem to be solved of the wall structure which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part of the wall structure which concerns on Embodiment 3 of this invention. It is explanatory drawing of the wall structure which concerns on Embodiment 4 of this invention (horizontal tension). It is explanatory drawing of the wall structure which concerns on Embodiment 4 of this invention (vertical tension). It is explanatory drawing of the conventional wall structure.

[Embodiment 1]
As shown in FIGS. 1 and 2, the wall structure 1 according to the first embodiment is a wall structure 1 formed by combining a plurality of nonflammable wall panels 3, and hot air invades the inside of the joint portion. It has a hot air intrusion prevention hardware 13 for preventing the above.
Hereinafter, it will be described in detail.

<Wall panel>
As shown in FIG. 2, the wall panel 3 is made of, for example, an extruded cement plate having a rectangular plate shape, and a recess 5 continuous in the longitudinal direction is formed on one end surface thereof, and the wall panel 3 is parallel to the one end surface. The end face is nonflammable and has a convex portion 7 continuous in the longitudinal direction and narrower than the opening width of the concave portion 5.
As an example of the dimensions of the wall panel 3, for example, the thickness is 60 mm, the width of the concave portion 5 is 32 mm, the depth is 20 mm, the height of the convex portion 7 is 20 mm, and the width is 26 mm.

In the wall structure 1 composed of the wall panel 3 as described above, the deepest portion of the concave portion 5A of one wall panel 3A and the tip portion of the convex portion 7B of the other wall panel 3B are held at intervals of, for example, 10 mm. The wall panels 3A and 3B can be combined so as to form joints that are not in contact with each other. A backup material 9 and a sealing material 11 are installed on the outdoor side of the joint portion (see FIG. 1).
The method of stretching the wall panels 3A and 3B is not limited in the present invention, and the structure of the joint portion is the same for both vertical stretching and horizontal stretching. Therefore, here, the convex portion 7B is upward and the concave portion 5A is downward. As an example, a horizontal stretching method in which wall panels 3A and 3B are laminated will be described.

<Hard air intrusion prevention hardware>
The hot air intrusion prevention hardware 13 is disposed inside a joint portion formed by inserting a convex portion 7B into a concave portion 5A in the wall panels 3A and 3B to prevent hot air intrusion, and is shown in FIGS. 1 and 3. As shown, it has a web 13a and flanges 13b formed on both sides thereof, and has a U-shaped portion having a substantially U-shaped cross section.
The hot air intrusion prevention hardware 13 fits the convex portion 7B of the wall panel 3B so as to be sandwiched between the flanges 13b, and has a joint portion so as to have a gap between the tip surface of the convex portion 7B and the web 13a surface. It is located inside.

As shown in FIGS. 1A and 1B, it is desirable that the hot air intrusion prevention hardware 13 has a height in contact with the wall panel 3A. As a result, even if the sealing material 11 is burnt during heating due to a fire on the outdoor side, there is no gap through which hot air directly flows. Further, even if the heating time is long, the sealing material 11 and the like are burnt, the wall panels 3A and 3B are further contracted, the distance between them is increased, and the width exceeds the top of the convex portion 7B (see FIG. 5). ), The hot air intrusion prevention hardware 13 can prevent the radiant heat of the flame from reaching the indoor side, and can reduce the hot air intrusion route.
The plate thickness of the hot air intrusion prevention hardware 13 is not particularly limited, but about 0.3 mm to 0.8 mm is sufficient.

The dimension (height) of the flange 13b in the hot air intrusion prevention hardware 13 is a dimension that can be held at a position higher than the height of the convex portion 7B, and the dimension (width) of the web 13a is equal to or less than the inner width of the concave portion 5A. The dimension is equal to or larger than the width of the convex portion 7B.
As long as these regulations are satisfied, for example, the shape of the tip of the flange 13b or the shape of the web 13a does not matter. For example, as shown in FIG. 3B, the tip of the flange 13b may be bent outward to form a leg portion 13c that abuts on the wall panel 3B, or the web 13a may be formed as shown in FIG. 3C. It may be arcuate, or as shown in FIG. 3D, the web 13a may be provided with a bent portion to make the entire shape polygonal.
As the hot air intrusion prevention metal fitting 13 shown in FIGS. 3A to 3D, a nonflammable material having a small heat capacity is preferable, and a material having a melting point of 1000 ° C. or higher is desirable, so a thin steel plate is used. Is preferable.

In the wall structure 1 according to the present embodiment, the substantially U-shaped hot air intrusion prevention metal fitting 13 arranged inside the joint portion formed by inserting the convex portion 7B into the concave portion 5A of the wall panels 3A and 3B is provided. Since it acts to increase the height of the convex portion 7B, it is possible to achieve the effect of reducing the hot air intrusion route at the joint portion without using a heat insulating material.
Further, since the hot air intrusion prevention metal fitting 13 has a small heat capacity, it is possible to reduce the radiant heat after the heating is completed.

The height of the hot air intrusion prevention hardware 13 does not necessarily have to be equal to or higher than the height of the convex portion 7B. In this case, the flange 13b is fixed to the convex portion 7B at the intermediate portion in the height direction of the convex portion 7B. By doing so, it may be arranged so as to have a gap portion between the tip surface of the convex portion 7B and the inner surface of the web 13a.

A specific example of the wall structure 1 of the present embodiment is shown, and a heating experiment was performed on the example, which will be described below.
As described above, the dimension (height) of the flange 13b of the hot air intrusion prevention hardware 13 of this embodiment is a dimension that can be held at a position higher than the height of the convex portion 7B. When the base of the convex portion 7B has an R shape with a radius of 3 mm, the height is 27 mm, which is the height from the upper portion to the deepest portion of the concave portion 5A. However, it is more desirable to extend from the tip of the flange 13b to the lower end of the R portion to form the leg portion 13c shown in FIG. 1 (b). In this case, the dimension (width) of the web 13a is an inner dimension of 26 mm.

In the heating experiment from the outdoor side conducted for comparison between the conventional example and the present example, the sealing material 11 started to burn from about 15 minutes after heating, and it was confirmed that the sealing material 11 fell off during the test. However, at this stage, there is almost no shrinkage of the wall panels 3A and 3B, and the gap between the side surfaces of the convex portion 7B and the concave portion 5A is about 3 mm on one side, so that the inflow of hot air is not large. However, as the heating continues, the wall panels 3A and 3B contract, the lower end of the wall panel 3A becomes higher than the upper part of the convex portion 7B, and when the joint penetrates in a straight line, the heat flow suddenly increases.

In this embodiment, the hot air intrusion prevention metal fitting 13 is fitted to the convex portion 7B, and the web 13a is in contact with the wall panel 3A inside the joint (inside the concave portion 5A). As a result, even if the sealing material 11 is burnt during heating on the outdoor side due to a fire, there is no gap through which hot air directly flows, so that even if the sealing material 11 or the like is burned by heating, the joints are closed. Further, even if the wall panels 3A and 3B contract for a long time, the distance between them becomes large, and the width exceeds the top of the convex portion 7B (see FIG. 5), the hot air intrusion prevention metal fitting 13 causes a flame. Since the radiant heat of the above is prevented from reaching the indoor side and a gap of 3 mm on one side is maintained between the convex portion 7B and the side surface portion of the concave portion 5A, the intrusion of hot air is also suppressed. Since the hot air intrusion prevention hardware 13 is a thin steel plate and has a simple shape, it is low cost and easy to install.

[Embodiment 2]
The wall structure 15 of the second embodiment is a modification of the configuration of the hot air intrusion prevention hardware 13 of the first embodiment, and the other configurations are the same as those of the first embodiment. The points different from 1 will be described.
The example shown in FIG. 4 is an example in which the hot air intrusion prevention hardware 13 is provided with the legs 13c by bending the tip of the flange 13b outward as in FIG. 1 (b) in the first embodiment. The following will be specifically described with a focus on the differences from FIG. 1 (b).

The length of the flange 13b of the hot air intrusion prevention hardware 13 of the present embodiment is longer than that shown in FIG. 1 (b), and when the wall structure 15 is configured, mutual wall panels are formed inside the joints. It is compressed between 3A and 3B, and the flange 13b is held in a state of being elastically deformed outward.
As a result, when heating by a fire on the outdoor side, even if the heating time is long, the wall panels 3A and 3B contract, the distance between them increases, and the width beyond the top of the convex portion 7B further increases. Since the compressed portion is restored and continuously closes the gap, it is possible to prevent the radiant heat of the flame from reaching the indoor side and to reduce the hot air intrusion route.

Further, in the present embodiment, as shown in FIG. 4, the flange 13b is elastically deformed so as to be in contact with the side surface in the recess 5A, thereby enhancing the closing effect and further enhancing the heat shielding property. be able to.
In order to ensure these, it is more desirable to fix the tip of the flange 13b of the hot air intrusion prevention hardware 13 to the lower wall panel 3B. A fire-resistant adhesive such as a sodium silicate adhesive is suitable for fixing, but since the temperature of the joints on the indoor side is relatively low, a gasket (not shown) is initially applied to the joints on the indoor side. A certain effect can be obtained even if the above is arranged.

The shape of the hot air intrusion prevention hardware 13 of the second embodiment is not particularly limited, and may be any of those shown in FIG.

The embodiment as a specific example of the second embodiment is the same as the embodiment shown in the first embodiment, but the flange 13b length of the hot air intrusion prevention metal fitting 13 is set to the deepest depth of the concave portion 5A from the base of the convex portion 7B. The difference is that they are formed larger than the dimensions up to the part. Specifically, the length of the flange 13b may be increased by 1 mm as compared with the embodiment of the first embodiment.
By doing so, when the wall structure 15 is configured, the hot air intrusion prevention hardware 13 is compressed between the mutual wall panels 3A and 3B inside the joint, and the flange 13b is elastically deformed outward to form the recess 5A. It is held in contact with the inner surface of the. As a result, as described above, even if the wall panels 3A and 3B contract, the distance between them increases, and the width beyond the top of the convex portion 7B further increases, the compressed height is restored and continues. This closes the gap, so that the radiant heat of the flame can be prevented from reaching the indoor side, and the hot air intrusion route can be reduced.

[Embodiment 3]
Similar to the second embodiment, the wall structure 17 of the third embodiment is designed to enhance the heat-shielding property of the joint portion against the expansion of the mutual spacing due to the shrinkage of the wall panels 3A and 3B due to heating.
Specifically, in the third embodiment, the flange 13b of the hot air intrusion prevention hardware 13 is slidably installed with the convex portion 7B of one wall panel 3B, and the web 13a is the concave portion 5A of the other wall panel 3A. It is joined to the deepest part of.

Various shapes can be applied to the hot air intrusion prevention hardware 13 in the same manner as shown in the first embodiment. The hot air intrusion prevention hardware 13 is coated with a sodium silicate-based adhesive on the upper surface of the web 13a, and is joined (fixed) in the recess 5A of the upper wall panel 3A. In addition to the above, the adhesive may be applied to the recess 5A, or both may be applied.

The effect of the third embodiment configured as described above will be described in comparison with the first embodiment.
In the first embodiment, since the web 13a in the hot air intrusion prevention hardware 13 is not joined to the recess 5A, when further heating is continued from the state of FIG. 1A, as shown in FIG. 5, the wall panel 3A It is conceivable that 3B contracts and a gap is formed between the web 13a and the recess 5A.
However, in the third embodiment, since the web 13a of the hot air intrusion prevention hardware 13 is joined to the concave portion 5A and the flange 13b is slidably installed with the convex portion 7B, the wall panel 3A is heated by heating. When the 3B contracts, the flange 13b slides on the convex portion 7B of the hot air intrusion prevention metal fitting 13 to follow the upper wall panel 3A. Therefore, as shown in FIG. 6, even if the wall panels 3A and 3B are separated from each other up to the height of the convex portion 7B, the hot air intrusion prevention metal fitting 13 continuously closes the gap, thereby further improving the fire resistance. be able to.

[Embodiment 4]
In the fourth embodiment, the wall structures 1, 15 and 17 of the first to third embodiments are arranged facing each other on at least one surface of the steel frame (column or beam), and the fireproof coating is applied to the other surface of the steel frame. The synthetically coated fireproof structure steel frame column 19 is formed by abutting or joining with 23.
The specifications of the wall structure may be any of the first to third embodiments, but here, the third embodiment is used.
The wall panels 3A and 3B may be horizontally or vertically laid, but first, the horizontally laid one will be described with reference to FIG. 7.

The columns 21 are arranged 250 mm apart from the wall structure 17 to form a synthetic coated fireproof steel frame column 19 using sprayed rock wool as the fireproof coating 23.
The steel type and dimensional shape of the column 21 are not limited, but it is a cold-formed square steel pipe column for building structure BCR295 □ -350 × 350 × 19. In the horizontal construction method, the wall panels 3A and 3B are supported by a ruler angle 25 extending over the entire length of the column height. The ruler angle 25 is supported by a connecting member 27 having a length of 250 mm, which is supported at intervals of 500 mm in the height direction of the pillar 21. For the connecting member 27 and the ruler angle 25, any shape and dimension can be selected as long as they have a cross-sectional dimension required for structural strength or more, but here, L-50 × 50 × 6 is used.

The wall panels 3A and 3B have a fastener 29 (a steel plate 31 (commonly known as a Z clip) bent into a substantially Z shape, a bolt 33, and a flat nut (not shown)) arranged on an indoor surface and hold a ruler angle 25. And fix it. Generally, the ruler angle 25 and the fastener 29 are finally welded and fixed. As shown in FIG. 7, the construction range of the hot air intrusion prevention hardware 13 was set to the range surrounded by the refractory coating 23.

The force bone 35 is arranged from the pillar 21 toward the wall structure 17 by using, for example, a round bar having a diameter of 9 mm, and supports a lath 37 as a fireproof coating base material. They are arranged at intervals of 450 to 500 mm in the height direction of the pillar 21, and one end thereof is overlapped on the side surface (flat plate portion) of the pillar 21 with a length of about 50 mm and fixed by welding. The other end reaches the vicinity of the wall structure 17.

The fireproof coating 23 is constructed with sprayed rock wool. The refractory coating 23 is sprayed onto the entire exposed portion of the lath 37 and the pillar 21 and compacted to a predetermined thickness. To make the finish thickness 25 mm, spray it with a spray thickness of about 35 mm, and when it is compacted to 25 mm, a density of about 0.28 to 0.30 can be obtained.

A fireproof joint material 39 is arranged in the vertical direction between the adjacent wall panels 3B and between the fireproof coating 23 and the wall panels 3A and 3B.

The wall panels 3A and 3B have the property of rapidly shrinking due to the decomposition of the cement component when the temperature reaches a predetermined temperature by heating. Therefore, when the heating time becomes long, as described above, the horizontal joints are greatly opened due to heat shrinkage, but even if the horizontal joints are expanded by about 5 mm, the hot air intrusion prevention metal fitting 13 slides following the deformation. As a result, it is possible to maintain the closed state and prevent hot air from flowing into the pillar 21.

Next, an example in which the wall panels 3A and 3B are vertically stretched will be described with reference to FIG. The same parts as those shown in FIG. 7 for explaining the horizontal tension are designated by the same reference numerals, and the description thereof will be omitted.
Since the wall panels 3A and 3B are supported by the ruler angle 25 attached to the beam, they are not shown in FIG. 8, but the fixing method of the wall panels 3A and 3B is the fastener 29 and (folded into a substantially Z shape). The steel plate 31 (commonly known as Z clip), bolt 33, and flat nut) are placed on the indoor surface, the ruler angle 25 is sandwiched, and the ruler angle 25 and the fastener 29 are finally welded and fixed. It is the same as the case of.
In the vertical construction method, wall panels 3A and 3B corresponding to the floor height of each floor are usually used, and since there are columns 21 and beams (not shown) on the indoor side of the joint, the total length of the wall panels 3A and 3B is used. The hot air intrusion prevention hardware 13 is arranged over the area.

In the synthetic fireproof structure, when the wall panels 3A and 3B are stretched horizontally, as shown in FIG. 8, the hot air intrusion prevention hardware 13 may be arranged in the range surrounded by the fireproof coating 23, but the wall It does not exclude the arrangement over the entire length of the structure 17.
In the case of vertical stretching, the wall panels 3A and 3B are arranged over the entire length.

1 Wall structure (Embodiment 1)
3 (3A, 3B) Wall panel 5 (5A, 5B) Concave part 7 (7A, 7B) Convex part 9 Backup material 11 Sealing material 13 Hot air intrusion prevention hardware 13a Web 13b Flange 13c Leg 15 Wall structure (Embodiment 2)
17 Wall structure (Embodiment 3)
19 Synthetic coating Fireproof structure Steel column 21 Pillar 23 Fireproof coating 25 Ruler angle 27 Connecting material 29 Fastener 31 Steel plate 33 Bolt 35 Rigid bone 37 Lath 39 Fireproof joint material 41 Wall structure (conventional example)

Claims (5)

It is made of a rectangular plate-like body, and a concave portion continuous in the longitudinal direction is formed on one end surface thereof, and the other end surface parallel to the one end surface is continuous in the longitudinal direction and narrower than the opening width of the concave portion. It is a wall structure composed of a plurality of nonflammable wall panels on which a convex portion is formed, combined so as to insert the convex portion into the concave portion.
It has a hot air intrusion prevention metal fitting that is disposed inside a joint portion formed by inserting the convex portion into the concave portion to prevent hot air intrusion, and the hot air intrusion prevention metal fitting is formed on the web and both sides thereof. It has a flange and is provided with a U-shaped portion having a substantially U-shaped cross section along the axis, and the convex portion is fitted so as to be sandwiched between the flanges, and between the tip surface of the convex portion and the inner surface of the web. A wall structure characterized in that it is arranged so as to have a gap portion in the wall structure. The wall structure according to claim 1, wherein the hot air intrusion prevention hardware fitted to the convex portion of one wall panel is in contact with the deepest portion of the concave portion of the other wall panel. The length of the flange in the hot air intrusion prevention hardware is set to be larger than the dimension from the base of the convex portion of the wall panel to the deepest portion of the concave portion of the other wall panel, and the mutual walls are set inside the joint portion. The wall structure according to claim 2, wherein the wall structure is compressed between the panels and held in an elastically deformed state. A claim that the hot air intrusion prevention hardware is characterized in that the flange is slidably installed with a convex portion of one wall panel and the web is joined to the deepest portion of a concave portion of the other wall panel. The wall structure according to 2 or 3. It is characterized in that it is arranged so as to face at least one surface of the steel frame column and is in contact with or joined with a fire resistant coating material to be applied to the other surface of the steel frame column to form a synthetic coated fire resistant structure steel frame column. The wall structure according to any one of claims 1 to 4.

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