JP6508289B2 - Construction method of composite coated fireproof structure of steel frame column - Google Patents

Description

  The present invention relates to a fireproof structure of a steel frame column, and more particularly to a synthetic coated fireproof structure of a steel frame column using a wall material as a part of its covering material and a method of installing the same.

  In the building, the required fire resistance time is determined according to the scale, location, etc. by the Building Standard Act and its related laws and regulations. In steel-framed buildings, the steel materials have a reduced resistance to heat, so that fireproof coating represented by shot rock wool is performed to raise the temperature of steel materials so that a certain resistance can be exhibited in the required fire resistance time. It is suppressing.

  In the fireproof structural qualification of steel frame columns using sprayed rock wool, the coated thickness of sprayed rock wool is, for example, 25 mm for 1 hour fire resistance (see Non-Patent Document 1), 45 mm for 2 hour fire resistance The coating thickness is different for each of the required fire resistance times, as described in Patent Document 2).

  On the other hand, a synthetic coated fire resistant structure of a steel frame column is known in which a wall material is utilized as a part of the fire resistant coating. As a wall material, an ALC board (lightweight aerated concrete board subjected to high temperature and high pressure steam curing), a PC plate (precast concrete board), an extruded cement board, a calcium silicate board and the like are used. This composite-coated refractory structure is used when the columns and the walls are close to each other, making it difficult for ordinary refractory coating work, etc. The gap between the wall material and the steel frame column is frequently 200 mm or less, For the part, the fireproof covering material is extended and disposed from the side surface of the steel frame column to the wall material, and the fireproof covering construction in the gap part is omitted.

  Non-Patent Document 3 is an ALC wall panel / sprayed rock wool synthetic coated steel frame column, and together with the blown rock wool, the fire resistant wall material ALC plate is used as a part of the fireproof coating of the steel frame column It is In this structure, the steel frame column and the wall material are spaced apart, and the lath mesh is attached as a base material of the fireproof coating to a force frame consisting of reinforcing bars fixed to the steel frame column and bridged with the wall material, It is a construction of blown rock wool. If necessary, a backup material to be a fireproof reinforcing material is placed at the boundary between the wall material and the lath mesh. As with Non-Patent Documents 1 and 2, this structure confirms the performance by a performance evaluation test conducted based on predetermined conditions, and is approved by the Minister of Land, Infrastructure, Transport and Tourism as defined in Article 2 Item 7 of the Building Standards Act. It was received.

  The problems with the above-described synthetic coated refractory structure of steel columns will be described by taking a square steel pipe column as an example among the synthetic coated steel columns consisting of the ALC wall panel and the blast rock wool in Non-Patent Document 3. The performance evaluation test method of this structure installs a test body in a heating furnace, performs specified heating in the state which loaded the long-term load of a pillar, and verifies structural safety. Since the four sides of the column (the entire surface of the ALC wall panel and the blown rock wool) are heated, especially when the ALC wall panel is held in the vertical support structure with only the upper and lower fulcrums, the ALC panel The deformation may cause a gap at the blow lockle boundary, and the inflow of heat from the portion may make it impossible to maintain the structural stability.

  This will be specifically described with reference to FIG. FIGS. 13 (1) and 13 (3) show the test of the synthetic coated fire-resistant structure of steel frame column composed of steel pipe column 1, wall material 2 made of ALC wall panel, and fire-resistant covering material 3 made of sprayed rock wool. It shows the body. When this test body is placed in a furnace and heated from the entire circumference of the column, as shown in FIGS. 13 (2) and (4), the wall material 2 is deformed convexly to the heating side, and the fireproof covering material 3 and A gap 5 is formed at the boundary of the furnace, heat from the furnace flows in from here, the steel material temperature rises, and the yield strength of the steel pipe column 1 is reduced.

  The deformation due to heating of the ALC wall panel is considered to be due to the thermal expansion difference of the reinforcing bars inside. That is, the ALC wall panel has a two-layer reinforcement structure in which reinforcing bars are disposed on the front and back sides of the inside, and in the ALC wall panel, the difference between the reinforcing bar temperature on the heating surface side and the reinforcing bar temperature on the heating rear surface side It is considered that warpage is caused by the difference in the change of the material length caused by the

  The following is an estimate of how much warpage is generated. First, the calculation conditions estimated from previous experiments are as follows.

(1) The steel temperature of a single steel frame column sprayed with rock wool coating on one side is heated to 1 hour at 230 ° C (Calculation result based on the steel temperature prediction formula according to the steel structure fire resistance design guideline □- 300 × 300 × 16, sprayed rock wool coating thickness 25 mm).

(2) The reinforcing steel temperature of the heating surface side (about 10 mm from the surface) inside the ALC wall panel when heating one surface of the ALC wall panel is set to 600 ° C.

(3) The reinforcing steel temperature on the heating back side at the time of (2) is about 100 ° C, but it is 300 ° C in consideration of the above (1) (references of (2) and (3): Nishimura et al. Fire resistance performance of ALC panel walls subjected to long-time heating ”, Proceedings of the Annual Meeting of the Architectural Institute of Japan (September 2006, Lecture No. 3059).

(4) The vertical height of the ALC wall panel is 3500 mm, and the linear expansion coefficient of the steel material is 1.2 × 10 ⁻⁵ / ° C.

  Based on the above calculation conditions, the change in length of rebar on the heating side is 24 mm, and the change in length of rebar on the non-heating side is 12 mm. Assuming that expansion and contraction in the vertical direction of the ALC wall panel is not restricted, and assuming that the average length of the rebars on the heated and non-heated sides is 3518 mm and the arc length is 3524 mm as "central part height of ALC wall panel = chord length" The height of the part (warpage) is about 89 mm.

  Therefore, in the detail of the ALC wall panel / sprayed rock wool synthetic-coated steel column shown in Non-Patent Document 3, the boundary between the lath mesh edge and the ALC wall panel when the ALC wall panel is deformed convexly to the heating side There is a possibility that a large gap will be formed in the steel, the temperature of the steel material may rise due to the inflow of heat and the yield strength may decrease, and in the case of 3 hours fire resistance, the rear side of the lath mesh It is described that the backup material is placed on the back surface side of the application surface. In addition, although not shown in the construction procedure of Non-Patent Document 3, the lath mesh itself does not have strength and rigidity even when the lath mesh end is fixed to the ALC wall panel in order not to generate the gap. By locally stretching only in the vicinity of the fixing portion, a crack penetrating the sprayed rock wool is generated, and heat is likely to flow through the coating.

  As a technique which solves the above problems, the refractory structure pillar of patent documents 1-4 is known, for example. In the fireproof structure of Patent Document 1, a rough wire gauze having end edges embedded in advance in an outer wall made of a precast concrete plate, and an end portion welded to a steel frame column so as to extend in the direction of the precast concrete plate at a predetermined interval Non-Patent Document 3 is a synthetic fire-resistant coating structure of a steel frame column formed by spraying a fireproof covering material integrally with the steel frame column to a predetermined thickness on a spray base laminated with a large number of metal frames attached to a steel frame. It is the structure which omitted the backup material of a statement.

  Here, the edge of the rough wire mesh is embedded in the outer wall, and the fire-resistant covering is stretchable since it overlaps with the metal lath attached to the power frame only with a slight positional offset. Even if deformation occurs in the outer wall due to heating, large gaps do not occur at the interface between the outer wall and the sprayed fire-resistant covering material, and since small cracks form dispersed, it is said that the flame does not directly intrude inside . However, as mentioned above, there is a high possibility of cracking through the refractory coating.

  In order to investigate the effect of cracks penetrating the fireproof coating, a 50 mm thick air layer was provided on the back of a 25 mm sample of the blast lock applied to the lath mesh, and the sample was thermally insulated by the ceramic fiber blanket. Two pieces were prepared, and one of the sprayed rock wool surfaces was cut (cross-cut) with a cutter knife to a depth reaching the lath mesh in order to simulate penetration cracks. Then, an experiment was conducted in which the heating furnace was installed in parallel on the refractory hearth so as not to be in contact with the flame of the burner in the furnace. FIG. 14 shows the temperature inside the furnace and the temperature of the air behind each. As shown in this figure, the temperature rise on the back side of the test piece in which the blow-up lockle is cut is large, and even if there is no penetration of the flame, if there is a crack that penetrates the fireproof coating, heat is An early rise in steel temperature due to inflow is expected.

  The fireproof structure of the steel frame column of patent document 2 arrange | positions the dry-type fireproof coating material between wall material and a steel frame column. In this configuration, the wall material has nothing to do with the fireproof performance of the steel frame column, and regardless of whether or not a gap is generated between the steel frame column and the wall material warpage, the predetermined fireproof performance can be achieved by the dry fireproof covering material. The fireproof coating of the steel frame column facing the relevant part can not be omitted by utilizing the fireproof performance of the wall material.

  In the synthetic coated fire-resistant structure of steel frame columns of Patent Document 3, a thermally expandable fireproof sheet is wound around a steel frame column, and the entire joint of the end portions of the heat-expandable refractory sheet and wall material is fixed by a flammable fixing auxiliary plate. is there. During the fire exposure, the combustible fixing auxiliary plate is burnt out and the joint is loosened, and the loosening prevents the expansion of the thermally expandable fireproof sheet, thereby filling the generated space. However, this fireproof structure can be realized by combining an expensive thermally expandable fireproof sheet as a fireproof covering material, and occurs even when the most common and low cost spray lock wool is combined with the flammable fixing auxiliary plate. We can not fill the gap.

  The synthetic coated fire-resistant structure of the steel frame column of Patent Document 4 has a board-like fire-resistant covering material independently installed at intervals from the steel frame column. In this structure, not only the accuracy is good, but also the joints are formed firmly, so that the effect of constraining the deformation due to heating can be expected. However, with materials that are difficult to stand alone and can not be expected to have tensile strength, such as sprayed rock wool, even if the positioning material is placed on the wall material over the entire length in the height direction, convex deformation occurs on the heating side of the wall material. Since it is likely that a crack is formed in the middle part of the blown rock wool, it is difficult to use it as it is.

Minister of Land, Infrastructure, Transport and Tourism authorization certificate FP060CN-9460 (sprayed rock wool coated steel frame column) Minister of Land, Infrastructure, Transport and Tourism certificate FP120CN-9463 (sprayed rock wool coated steel column) Minister of Land, Infrastructure, Transport and Tourism authorization certificate FP060CN-9408 (ALC panel / spray rock wool synthetic coating / steel frame column)

Japanese Utility Model Application Publication No. 4-16203 Unexamined-Japanese-Patent No. 2004-225271 JP, 2013-234459, A Japanese Patent Application Laid-Open No. 9-100587

  As described above, in the case of a conventional fire protection structure with steel frame columns, when the wall material is deformed convexly to the heating side at the time of fire, etc., a gap is generated at the boundary between the extension of the fireproof covering material and the wall material. There was a possibility that the yield strength of the steel frame column might be lowered by the rise of the steel material temperature by the heat which entered from here. For this reason, the development of a synthetic coated fire-resistant structure of high-performance steel frame columns that requires no gaps at the boundary even if the wall material is heated and deformed to the side by using the most general and low cost spray lockle is required. It was being done.

  The present invention has been made in view of the above, and it is possible to prevent the formation of a gap at the boundary between the extended portion of the fire-resistant covering material and the wall material even if the wall material is deformed so as to be convex laterally. It is an object of the present invention to provide a synthetic coated refractory structure of a column and a method of constructing the same.

  In order to solve the problems described above and to achieve the object, the composite coated fire-resistant structure of steel frame column according to the present invention is a fireproof covering material of a steel frame column disposed in proximity to the wall material. Between the wall material and the steel frame column, by using the fireproof covering material made of the blowing material and using the fireproof material for the other area, and extending the fireproof covering material from the steel frame column to the wall material Plate-like or net-like fireproof covering base material as a base of the fireproof covering material which extends from the steel frame pillar to the wall material in the synthetic coated fire-resistant structure of the steel frame column connected to each other; It is characterized in that it is disposed over and deformable following a deformation of the wall material in a direction away from the steel column.

  In the above-described invention, the fireproof covering base material has a folded plate shape or a bent plate shape having a bent portion continuously extending in the vertical direction between the steel frame column and the wall material. It is characterized in that it is constituted by a corrugated plate-like body or a net-like body, and the contact portion between the fireproof covering base material and the wall material is fixed to the wall material.

  In the above-described invention, the fireproof covering base material is bent at the contact portion with the wall material and extended along the wall material, and the end is also an end thereof. It is characterized in that it is joined to the wall material in the vicinity of the part, and the fireproof covering base material is configured to be deformable following the deformation of the wall material, with the fixing part as a fulcrum.

  Further, in the above-described invention, the composite fire protection structure of steel frame column according to the present invention, in the above-described invention, the fire-resistant coated base material is arranged in advance within the projection range of the steel frame column with the back surface side facing up. And the fireproof reinforcing material is disposed at least in the projected range of the steel frame column of the fireproof covering substrate, and the other end of the fireproof covering substrate is fixed to the steel frame column; It is characterized in that it is configured to be deformable with the fixing portion as a fulcrum following the deformation of the material.

  The present invention also relates to a method for constructing the above-described composite-coated fire-resistant structure of steel frame columns according to the present invention, which comprises placing a fire-resistant covering material in advance on a part or all of the fire-resistant covering substrate. It is characterized in that it is fixed to a wall material.

  According to the synthetic coated fire-resistant structure of steel frame columns according to the present invention, the fire-resistant base material to be the base of the fire-resistant covering material is configured to be able to follow the deformation of the wall material. There is no gap at the boundary between the fireproof covering and the wall material. For this reason, it is effective in the ability to suppress the fall of the fireproof performance in the synthetic covering fireproof structure of steel frame pillar.

FIG. 1 is a plan sectional view showing the positional relationship between a wall material and a steel pipe column (steel frame column) to which the present invention is applied. FIG. 2 is a plan sectional view showing an example of a fireproof covering base material (fireproof covering base material) used in the present invention, (1) is a case of a corrugated shape, and (2) is a case of a folded plate shape. . FIG. 3 is a plan sectional view showing Embodiment 1 of the synthetic coated fire resistant structure of steel frame columns according to the present invention. FIG. 4: is a plane sectional view explaining the effect | action of Embodiment 1 of the synthetic-coated fireproof structure of the steel frame column concerning this invention. FIG. 5 is a plan sectional view showing Embodiment 2 of the synthetic coated fire resistant structure of steel frame columns according to the present invention. FIG. 6 is a plan sectional view showing Embodiment 3 of the synthetic coated fire resistant structure of steel frame columns according to the present invention. FIG. 7 is a cross-sectional plan view showing a modification of the third embodiment of the synthetic coated refractory structure of steel frame columns according to the present invention. FIG. 8 is a cross-sectional plan view for explaining the operation of the third embodiment of the synthetic coated fire resistant structure of steel frame columns according to the present invention. FIG. 9 is a plan sectional view showing the state of the first installation stage of the fifth embodiment of the synthetic coated refractory structure of steel frame columns according to the present invention. FIG. 10 is a plan sectional view showing the state of the second installation stage of the fifth embodiment of the synthetic-coated refractory structure of a steel frame column according to the present invention. FIG. 11 is a cross-sectional plan view showing the state of the construction completion stage of the fifth embodiment of the synthetic coated refractory structure of steel frame columns according to the present invention. FIG. 12 is a cross-sectional plan view for explaining the operation of the fifth embodiment of the synthetic coated refractory structure of steel frame columns according to the present invention. FIG. 13 is a view showing a test body of a conventional synthetically coated refractory structure of steel frame columns, (1) is a side view before heating, (2) is a side view during heating, and (3) is a (1) (4) is a plan sectional view taken along the line AA of (2). FIG. 14 is a diagram showing the results of the heating test.

  Hereinafter, an embodiment of a synthetic coated fire resistant structure of a steel frame column according to the present invention and a construction method thereof will be described in detail based on the drawings. The present invention is not limited by the embodiment.

  FIG. 1 is a plan view showing the positional relationship between a steel pipe column (steel frame column) and a wall material. As shown in this figure, the steel pipe column 1 and the wall material 2 are disposed close to each other at an interval. Although the dimension of the space | interval 11 of the steel pipe column 1 and the wall material 2 is not specifically limited, Below, 200 mm is demonstrated to an example. Moreover, the surface of the direction orthogonal to the surface of the wall material 2 of the steel pipe column 1 is defined as a side surface (side surface 1a) for convenience. As for the wall material 2, the surface facing the steel pipe column 1 is defined as the indoor surface (indoor surface 2a), and the surface opposite to this is defined as the outdoor surface (outdoor surface 2b).

  The dimension and shape of the steel pipe column 1 need not be particularly limited, but in the following, a square steel pipe column of -250 × 250 × 9 mm will be described as an example. Further, it goes without saying that the steel frame column of the present invention is not limited to a square steel pipe column, but can be applied to a column consisting of a circular steel pipe and a column consisting of an H-shaped steel. The wall material 2 will be described by taking an example of a wall material in which an ALC plate with a thickness of 100 mm is fixed only at the upper and lower ends of the floor by the rocking method, but it is not limited thereto. As long as it is a plate-like material such as a calcium plate, any material and mounting method may be used.

  In the following description, the fire-resistant coating material is represented by shot rock wool, and the coating thickness is described as 25 mm equivalent to the current one-hour fire-resistant structure, but all of the fire-resistant type fire-resistant coating materials Correspondingly, each required coating thickness can be applied.

First Embodiment
First, the first embodiment of the present invention will be described.
As shown in FIG. 3, in the synthetic-coated fire-resistant structure 10 of steel frame column according to the first embodiment, the wall material 2 is used as a fireproof covering material of the steel frame column 1 disposed in proximity to the wall material 2. While utilizing the opposite range, the fireproof covering material 3 is used for the other ranges, and the fireproof covering material 3 is extended from the steel frame column 1 to the wall material 2 to arrange the wall material 2 and the steel frame column 1 It is the structure which connected between.

  A plate-like or net-like fireproof covering base material 4 is arranged as a base of the fireproof covering material 3 extending from the steel frame column 1 to the wall material 2 so as to extend between the steel frame column 1 and the wall material 2. That is, the fireproof covering base material 4 is disposed on an extension extending from both side surfaces 1a of the steel pipe column 1 to the indoor surface 2a of the wall material 2, one end thereof is fixed to the steel pipe column 1, and the other end is fixed to the wall material 2. The range in which the fireproof covering base material 4 is disposed is a fireproof covering extension 31 in which the fireproof covering material 3 from the steel pipe column 1 is extended.

  The fire-resistant base material 4 is configured to be able to deform following the deformation of the wall material 2 in the direction away from the steel pipe column 1. For example, as shown in FIGS. 2 (1) and 2 (2), the fire-resistant base material 4 is a flat plate such as a lath or thin steel plate having a corrugated or folded plate shape having bent portions 4a continuous in the vertical direction. Although it can be configured using, in this embodiment, an example configured with a wave-shaped lath will be described. In addition, as shown in FIG. 2, as the fireproof coating base material 4 of this invention, if the bending part which exhibits a substantially L-shape by planar cross section view is at least one or more places, the shape of a mountain which consists of circular arcs or polygons etc. There is no limitation on the number of bent portions, and there is no limitation on the interval and height of the mountains, but it is necessary to set the size and the number that can absorb the deformation of the wall material 2.

  The spacing and shape of the mesh in the case where the fireproof covering substrate 4 is made of a lath are not particularly defined. Moreover, when the fireproof coating base material 4 is comprised by a flat plate, in order not to restrain a displacement of the wall material 2, 1.6 mm or less of board thickness is more preferable, and the fixability of the fireproof coating material 3 is ensured. For this purpose, embossing and punching may be used in combination.

  The fireproof covering base material 4 arrange | positions the fold line direction of a mountain in the vertical direction (up-down direction), as shown in FIG. By arranging the fireproof covering base material 4 so that the mountain fold line direction is vertical, the rigidity in the vertical direction is secured even when a lath or thin steel plate is used. The step of welding and placing may be partially or completely omitted. Both ends of the fire-resistant base material 4 are joined to the wall material 2 and the steel pipe column 1 so that no displacement occurs. For this joining, any joining method such as welding, staples, screws, or wire bars may be selected, and washers may be used in combination with the fixing portion with the wall material 2.

  The arrangement position of the fireproof covering base material 4 is along the extension of the side surface 1a of the steel pipe column 1, but if arranged closer to the center than the side surface 1a of the steel pipe pillar 1, as described later This is better because the thickness of the coating can be increased. When the thickness of the fireproof covering material 3 is reduced in consideration of the heat capacity of the steel pipe column 1, the covering thickness of the fireproof covering extension 31 with reference to the surface of the fireproof covering material 3 covering the side surface 1a of the steel pipe column 1 It is better to arrange the fireproof coating base material 4 so as to be 25 mm for the current one-hour fireproof specification and 45 mm for the two-hour fireproof specification.

  In the case of application of the fire-resistant covering material 3, sufficient compaction is carried out after spraying, and in the case of the present embodiment using a lathe for the fire-resistant covering substrate 4, the back side is also wrapped around and coated, The lath is applied so as to be contained inside the fireproof covering 3.

  As shown in FIG. 3, a composite lath with a corrugated shape is used as the fireproof covering base material 4, the bending portion 4 a is disposed in a direction continuing in the vertical direction, and the fireproof covering material 3 is applied in the above manner. The operation of the fireproof structure 10 will be described. When the wall in the height direction is displaced to the heating side by heating from the outdoor surface 2b side, as shown in FIG. 4, the wave-shaped portion of the lath is stretched in the indoor / outdoor direction In order to follow the thermal deformation of the wall material 2, no harmful opening (gap) is generated at the boundary between the fireproof covering material 3 of the fireproof covering extension 31 and the wall material 2. More specifically, when the deformation of the wall material 2 is slight, the fire-resistant covering 3 hardly suffers damage since the wave-shaped lath is extended entirely. When deformation further progresses, cracks 3a are generated on the tensile side of the surface of the fireproof covering 3, that is, the part corresponding to the valley of waves of the lath when the fireproof covering 3 is viewed from the outside, but the cracks 3a stop at the lath part Since the fire-resistant covering material 3 on the back side of the lath is on the compression side, no cracks occur and the cracks 3 a do not penetrate the fire-resistant covering material 3.

  Thus, according to the present embodiment, in the fireproof structure of the steel pipe column 1 disposed in proximity to the wall material 2, the synthesis of the steel frame column using the wall material 2 as a part of the fireproof coating of the steel pipe column 1 Even in the rocking method in which the wall material 2 is fixed only at the upper and lower sides of the floor, which is the most disadvantageous in deformation of the wall material 2 during heating among the coated fireproof structures, the heating direction side of the wall material 2 generated in the above performance evaluation test It is possible to obtain a synthetic coated fire-resistant structure of steel frame column which has a deformation followability to a convex deformation and has sufficient performance for the required fire resistance time.

  In the present embodiment, when, for example, No. 1 wave-shaped lath is used as the fireproof covering base material 4, when the length of the fireproof covering extension 31 is 200 mm, it is possible to follow the displacement of the wall material 2 up to about 180mm. It is. When the dimension of the fireproof coating extension part 31 is small, it can respond by adjusting the height and space | interval of the peak in the wave type lath of the fireproof coating base material 4 suitably.

Second Embodiment
Next, a second embodiment of the present invention will be described.
As shown in FIG. 5, the synthetic-coated fire-resistant structure 20 of steel frame columns according to the second embodiment uses a flat plate processed into a folded plate shape as shown in FIG. It is. The configuration other than the fireproof covering base material 4 is the same as that of the first embodiment described above, and thus the detailed description thereof will be omitted.

  Although the height and arrangement interval of the fireproof covering base material 4 can be set arbitrarily, the height of the mountain is 10 mm and the arrangement interval is 33 mm as in the first wave-shaped lath. According to the present embodiment, as in the above-described first embodiment, since the fireproof covering base material 4 is stretched following the deformation of the wall material 2, the fireproof covering material 3 of the fireproof covering extension portion 31 and the wall material No harmful openings (gaps) at the boundary with 2. In addition, the largest dimension which can follow deformation in this case is about 110 mm. Although the fireproof covering material 3 does not reach the back surface side of the fireproof covering base material 4 in the present embodiment, the fireproof covering base material 4 serves as a firestop for fire even if a crack occurs on the surface of the fireproof covering material 3 temporarily. Because of the function, the safety is higher than in the first embodiment described above.

Third Embodiment
Next, a third embodiment of the present invention will be described.
As shown in FIG. 6, in the synthetic coated fire resistant structure 30 of steel frame columns according to the third embodiment, a flat lath is used as the fireproof covering base material 4 and one end 4 b is in the vicinity of the end of the side surface 1 a of the steel pipe column 1. While the other end side is extended toward the indoor surface 2a of the wall material 2 to be in contact with the wall material 2, and at the contact portion 2c, L is directed toward the outside of the gap 5 in plan view. It is bent in the shape of a letter and extended along the wall material 2, and only the end 4 c is joined to the wall material 2 to form a fixed part 41. As the fixing portion 41, for example, a joining member such as a tapping screw or a staple may be used, and a washer, a support plate or the like may be used in combination. Thus, the fireproof covering base material 4 can be deformed with the fixing portion 41 as a fulcrum, and can follow the deformation of the wall material 2.

  In this synthetic-coated fire-resistant structure 30 of steel frame columns, the L-shaped bent portion 4d of the fire-resistant coated base material 4 may be bent at a right angle as shown in FIG. As shown in FIG. 7, it is better to make it an R shape having a curvature. The extension dimension from the bent part 4d to the end 4c is about 120 mm. More desirably, the bent portion 4 d may be arranged so as to float relative to the wall material 2. By arranging the bent portion 4d in a floating manner, the fire-resistant covering material 3 is applied to overlap on the back side of the fire-resistant covering base material 4, that is, the boundary portion side with the wall material 2, thereby enhancing safety.

  The fire-resistant base material 4 used in the synthetic-coated fire-resistant structure 30 of the steel frame column may have a wave-shaped portion or a bent portion in addition to the bent portion 4d, and only the bent portion 4d is bent. It is needless to say that there is no need to have a bent part. The application of the fireproof covering material 3 to the fireproof covering substrate 4 is the same as that of the first embodiment described above. The fireproof covering material 3 is sprayed on the whole of the fireproof covering substrate 4.

  When the wall material 2 is deformed so as to be convex toward the outdoor surface 2b by heating, as shown in FIG. 8, the fixing portion 41 with the fireproof coating base material 4 is pulled, and the fireproof coating base material 4 is viewed in plan view. Since the fixed portion 41 is easily pivoted and deformed, the bent portion 4d is also stretched to follow the deformation of the wall material 2 and damage to the fireproof covering material 3 such as a harmful opening does not occur. The predetermined fire resistance performance can be secured for 1). The dimensions of the present embodiment can follow deformation up to about 95 mm, but the margin can be further improved by lengthening the extension dimension from the bent portion 4d to the end portion 4c, so that it is possible to follow the assumed deformation. Design properly.

Fourth Embodiment
Next, the fourth embodiment of the present invention will be described.
The fourth embodiment uses a flat plate as the fireproof covering base material 4 and arranges and uses it in the same manner as in the above third embodiment. Since the configuration is the same, the diagram will be described by the same diagram as the third embodiment above, and the description of the overlapping portions will be omitted. Although the fireproof coating base material 4 processed and used the galvanized steel plate with a plate thickness of 0.8 mm into L shape, plate thickness is arbitrary.

  The operation different from that of the third embodiment of the synthetic coated refractory structure of the steel frame column will be described. In the present embodiment, although the fireproof covering material 3 does not reach the back side of the fireproof covering base material 4, even if a crack occurs in the fireproof covering material 3, the fireproof covering base material 4 uses a steel plate. There is no penetration crack to reach. Therefore, it functions as a fire stop material for the flame, and the flame and the hot air do not directly intrude into the gap 5, and the safety is further enhanced.

  In the above-described embodiment, when the fire-resistant base material 4 is fixed to the steel pipe column 1 and the wall material 2 using a well-known rolled steel, the wall material 2 is fixed depending on the strength and rigidity of the fire-resistant base material 4. The effect of constraining the deformation of the wire is strongly developed, and the soundness of the fireproof covering extension 31 can be secured.

Fifth Embodiment
A fifth embodiment of the present invention will now be described.
As shown in FIG. 11, the composite coated refractory structure 40 of the steel frame column according to the fifth embodiment has a fire-resistant base material 4 consisting of a flat lath, a wall material 2, and an end 4 c thereof a projection range of the steel pipe column 1. The fixed portion 41 is disposed inside and joined to form the fixed portion 41, and the fireproof reinforcing material 32 is disposed at least within the projection range of the steel pipe column 1, and the other end 4b of the fireproof covering 4 is made into the steel pipe column 1. It is fixed and the fireproof covering material 3 is constructed, and is configured to be deformable with the fixing portion 41 as a fulcrum following the deformation of the wall material 2.

  FIG. 9 shows the first stage of application of the present embodiment, in which the fire-resistant base material 4 is attached to the indoor surface 2 a of the wall material 2 and the fire-resistant reinforcing material 32 is disposed. The fire-resistant base material 4 is longer than the dimensions of the fire-resistant covering extension 31 and the range of the extended length is disposed within the projection range of the steel pipe column 1 and the end of the fire-resistant covering base material 4 4c is fixed by a fixing member such as a staple to form a fixing portion 41. Under the present circumstances, the fireproof coating base material 4 is arrange | positioned so that a fireproof coating spray side may turn into a back surface. It is more desirable for the fixing portion 41 to secure an end clearance distance from the end 4c of the fireproof covering base material 4 of, for example, about 10 to 20 mm. At this stage, the fireproof covering substrate 4 may not be bent. In addition, although the staple was illustrated as a fixing member here, as demonstrated in said Embodiment 1, you may use another fastener.

  Next, the fireproof reinforcing material 32 is disposed at least within the projection range of the steel pipe column 1 from the end 4 c of each fireproof covering base material 4. The fireproof reinforcing material 32 can be made of a material having a predetermined fire resistance, such as a sprayed rock wool or a rock wool warm plate. Here, as shown in FIG. 9, an extra length is provided from the fixing portion 41 to the center side of the steel pipe column 1 so as to completely cover the fixing portion 41. Furthermore, it is more desirable to provide an extra length beyond the projection range of the steel pipe column 1.

  And after bending the other end 4b side of the fireproof covering foundation material 4 and fixing the end 4b to the steel pipe pillar 1 side as shown in the second construction mode shown in FIG. 10, it is shown in FIG. As described above, the fireproof covering material 3 is spray-applied to the fireproof covering base material 4 and the outer surface side (surface side) of the steel pipe column 1. Here, the fire-resistant base material 4 may be bent at a right angle in an L-shape or may be bent loosely in an R-shape having a curvature, and more preferably from the fixing portion 41 to the bending portion 4d. It is good to arrange it by The fireproof reinforcing material 32 and the fireproof covering material 3 are overlapped and constructed by placing the bent part 4d in a floating state and applying the fireproof covering material 3 to the part concerned, and the safety is further enhanced. Further, in the embodiment in which the above-described fireproof reinforcing material 32 is installed with excess length beyond the projection range of the steel pipe column 1, it becomes the form shown in FIG. 32 ends are reached. By the application of the fireproof covering material 3, as shown in FIG. 11, the mutually overlapping parts are formed, so that the fireproof covering can be surely continued and the safety of the weak boundary part can be enhanced.

  The difference between the present embodiment and the other embodiments 1 to 4 in operation and effect is that, as shown in FIG. 12, the bending portion 4d of the fireproof covering base material 4 is used when following deformation of the wall material 2. As the exposed surface of the indoor surface 2a of the wall material 2 expands as the distance from the wall material 2 increases, the temperature of the wall material 2 rises, and the temperature difference between the front and back surfaces decreases. The point is that the convex deformation is alleviated. Furthermore, since the fireproof reinforcing material 32 comes to press the end against the wall material 2 more firmly at the end 4c with the deformation of the fireproof covering base material 4, the part does not open. This effect is more effective when the fixing portion 41 is formed by taking an end space from the end portion 4c, and the fireproof covering material 3 is not damaged by the harmful opening or the like. Prescribed fire resistance performance can be secured.

Sixth Embodiment
A sixth embodiment of the present invention will now be described.
In the fifth embodiment described above, the construction method of spraying the fireproof covering material 3 against the fireproof covering base material 4 which has been previously constructed has been described as the construction procedure of the fireproof covering material 3. After the fireproof covering material 3 is disposed on the fireproof covering base material 4, the fireproof covering material 3 is attached and fixed to the steel pipe column 1 and the wall material 2.

  As explained in the above-mentioned Embodiment 1, in the case of application of the fire-resistant covering material 3, in the case of the blast rock wool, it is sufficiently compacted after the spraying, and when the lath is used for the fire-resistant covering substrate 4 It is desirable that the back side be covered so as to cover the lath, that is, the lath be contained in the interior of the fireproof covering 3, and if such a state of construction can be ensured, the wall material 2 Even if the fire-resistant base material 4 is stretched due to the deformation of the fire-resistant base material 4, even if any one of the front surface and the back surface becomes a tensile side when the bent portion of the fire-resistant coating material 3 is stretched When the surface is on the compression side, it acts in the direction of closing the crack, and the occurrence of the crack penetrating the fireproof coating extension 31 can be suppressed.

  In the present embodiment, the fire-resistant covering material 4 is sprayed onto the fire-resistant covering substrate 4 in advance, so that the covering state of the back surface side of the fire-resistant covering substrate 4 can be confirmed before mounting. Construction will be able to be completed. In addition, although the fire-resistant coating material 3 took and explained the shot rock wool as an example, it goes without saying that other fire-resistant materials may be applied, and the application range of the fire-resistant coating material 3 said here is both front and back It may be or only one or the other. Furthermore, as for the fire-resistant covering material disposed on the back side, another fire-resistant material may be separately provided as long as it follows the deformation of the fire-resistant covering substrate 4. For example, mat-like or board-like material May be.

  As described above, according to the composite-coated fire-resistant structure of steel frame columns according to the present invention, the fire-resistant covering base material for reinforcing the fire-resistant covering material is configured to be able to follow the deformation of the wall material. There is no gap at the boundary between the fireproof covering and the wall material even if For this reason, the fall of the fireproof performance in the synthetic covering fireproof structure of steel frame pillar can be controlled.

1 Steel frame column (steel pipe column)
DESCRIPTION OF SYMBOLS 1a Side surface 2 Wall material 2a Indoor surface 2b Outdoor surface 3 Fireproof covering material 3a Crack 4 Fireproof covering base material 4a Fold line 4b, 4c End part 4d Bent part 5 Gap part 10, 20, 30, 40 Synthetic covering fireproof structure 11 Spacing 31 Fireproof Cover extension 32 Fireproof reinforcement 41 Fixing part

Claims (1)

As a fireproof covering material of a steel frame column arranged close to a wall material, the wall material is utilized for the opposing range of the steel frame column, and a fireproof covering material made of a blasting material is used for other ranges, and a fireproof covering Material is extended from the steel column to the wall material to construct a composite-coated fire-resistant structure of the steel column connected between the wall material and the steel column,
The composite-coated refractory structure of the steel frame column is included in the fire-resistant covering material as a base of the fire-resistant covering material extended from the steel frame column to the wall material, and is a fireproof covering substrate fixed to the steel frame column and the wall material And the fireproof covering material so as to be able to follow the deformation of the wall material in a direction away from the steel frame column, and the fireproof covering substrate material is a bent portion which is continuous in the vertical direction at least a part of the range between the steel frame column and the wall material And the contact portion between the fire-resistant base material and the wall material is fixed to the wall material.
A fire-resistant covering material is previously arranged on a part or all of the fire-resistant covering substrate, and then the fire-resistant covering material is fixed to a steel frame column and a wall material.

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