JP2019152039A - Covering method of fire resistive covering material on steel column - Google Patents

Abstract

To provide a covering method of fire resistive material to improve workability and reliability of fire resistance efficiency of a steel column.SOLUTION: A covering method of fire resistive material comprises: a shielding process shielding one side of a space 20 formed between wall material 3 and an opposite surface 2a of a steel column 2 opposing to the wall material with shielding material 68; and an opposite surface spraying process spraying fire resistive covering material 5 from the other side of the space 20 on the opposite surface 2a of the steel column 2, wherein the opposite surface spraying process is to spray the fire resistive covering material 5 such that a finishing surface of the fire resistive covering material 5 which is covered on the opposite surface is an outer diameter of a spray gun 25 + 75 mm or more from an inner surface of the wall material 3.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a fire-resistant coating method for coating a steel column arranged in the vicinity of a wall material with a fire-resistant coating material, and particularly to improve workability and reliability of fire resistance without deformation of the wall material due to heating. It is related with the coating method of the fireproof coating material with respect to the steel column suitable for improving a property more.

  Conventionally, steel columns have been used as columns constituting steel structures such as apartment houses and buildings. The steel column has fireproof performance standards based on notifications from the Ministry of Land, Infrastructure, Transport and Tourism and JIS standards. Since the strength of steel columns is reduced by heating due to fire, in order to meet the fire performance standards, it has been traditional to coat the surface of steel beams with a fire-resistant coating material made of spray rock wool or the like with excellent fire resistance. It has been broken. Since the steel column coated with such a fireproof coating material can suppress a temperature rise even if a fire occurs, it can exhibit the desired fireproof performance in the required fireproof time.

  In particular, among steel columns, those close to the outer wall of the steel structure have a problem that the construction cannot be performed with a single fireproof coating because the distance between the outer wall and the steel column is narrow. In order to solve this problem, a synthetic covering refractory structure is conventionally used in which the outer wall is handled as part of the steel column covering.

  FIG. 17 shows a general configuration example of this synthetic coated fireproof structure. FIG. 17 is a horizontal sectional view in which an intermediate portion of a steel column 71 having a rectangular cross section is a cut surface. The upper side of the outer wall 72 is the outdoor side, and the lower side of the outer wall 72 is the indoor side. A backing material 74 is attached to the inside of the outer wall 72, and a strength frame 75 is constructed from the backing material 74 to the steel column 71. Then, a reinforcing member 76 such as a metal lath or an iron plate is fastened and fixed to the force frame 75 by a wire or the like (not shown). The reinforcing material 76 is arranged as if it continues from the surfaces 71b and 71d of the steel column 71.

  Thereafter, the fireproof covering material 73 made of sprayed rock wool or the like is sprayed onto the surfaces 71 b to 71 d of the steel column 71 and the surface of the reinforcing material 76 by a spraying device (not shown). As a result, the surfaces 71b to 71d of the steel column 71 and the surface of the reinforcing material 76 are covered with the fireproof covering material 73 with a substantially constant thickness. Further, the opposed surface 71a of the steel column 71 facing the outer wall 72 is not covered with the fireproof coating material 73, and a closed space 80 surrounded by the opposed surface 71a, the outer wall 72, and the reinforcing material 76 is formed. It will be.

  In Patent Documents 1 and 2, even if the outer wall is heated and deformed to the side, the reinforcing material 76 can follow the heating deformation, thereby providing a fireproof coating material 73 coated on the surface of the reinforcing material 76. In addition, a synthetic coated refractory structure in which no gap is generated between the outer wall 72 and the outer wall 72 is disclosed.

JP, 2006-196787, A JP 2017-101387 A

  However, the synthetic coated refractory structures represented by the disclosed technologies of Patent Documents 1 and 2 described above have a problem that the construction cost becomes high because the number of parts is large and the burden of construction labor is large. It was.

  Further, in the conventional synthetic fireproof structure described above, when the outer wall 72 is damaged and deformed, and the fire reaches the inside closed space 80 covered by the fireproof covering material 73, the steel column 71 is As a result, the temperature is increased directly by heating, and as a result, it is difficult to improve the reliability of the fire performance of the steel column 71.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to provide a fireproof coating for a steel column that can improve the workability and the reliability of the fireproof performance of the steel column. It is to provide a method for coating a material.

  In order to solve the above-described problems, the inventors have shielded one side of a space formed between a wall material and a facing surface of a steel column facing the wall material with a shielding material. When the fireproof coating material is sprayed from the other side of the space to the facing surface in the above, the surface of the final fireproof coating material coated on the facing surface is 125 mm or more from the inner surface of the wall material. Invented a method of coating fireproof coatings on steel columns to be controlled.

  The method of covering a steel column according to the first aspect of the present invention is a method of covering a steel column disposed in the vicinity of a wall material, and is a method of covering the wall material and the steel column facing the wall material. A shielding step of shielding one side of the space formed between the surfaces with a shielding material, and spraying a fireproof coating material with a spray gun from the other side of the space to the opposing surface of the steel column An opposing surface spraying step.

  The method for coating a steel column according to a second aspect of the present invention is the method of covering a steel column according to the first aspect, wherein in the facing surface spraying step, the final surface of the fireproof coating material coated on the facing surface is the inner surface of the wall material. From the above, the fireproof coating material is sprayed so that the outer diameter of the spray gun becomes +75 mm or more.

  According to a third aspect of the present invention, there is provided a method for covering a steel column with a fireproof covering material according to the first or second aspect, wherein, in the shielding step, a steel frame is formed from the inner surface of the wall material to the steel column on one side of the space. And the shielding material is installed through the erected bone.

  According to a fourth aspect of the present invention, in the first or second invention, in the first or second invention, in the shielding step, the shielding step is performed through a force frame extending in the vertical direction from a diaphragm attached to the steel column. The shielding material is installed.

  According to a fifth aspect of the present invention, there is provided a method for covering a steel column with a fireproof coating material according to the first or second invention, wherein after the fireproof coating material is sprayed on the facing surface in the facing surface spraying step, the shielding material is removed. It has a material removal process and a non-opposing surface spraying process which sprays a fireproof covering material with respect to surfaces other than the said opposing surface of the said steel column from which the shielding material was removed by the said shielding material removal process.

  The method for coating a steel column according to a sixth aspect of the present invention is the method of covering a steel pillar according to the third or fourth aspect of the present invention, after spraying a fireproof coating on the facing surface in the facing surface spraying step, A shielding material removing step to remove, and a non-facing surface spraying step of spraying a fireproof covering material on a surface other than the facing surface of the steel column from which the shielding material and the skeleton were removed by the shielding material removing step. It is characterized by.

  According to the present invention having the above-described configuration, the steel frame column can be configured only by coating the fire-resistant coating material to the intended coating thickness. For this reason, structurally, the number of parts can be reduced and the construction cost can be reduced as compared with the conventional synthetic coated fireproof structure. In particular, according to the present invention, it is possible to significantly reduce the strength and shielding material 6 from the amount required in the conventional synthetic coated fireproof structure. In addition, after removing the skeleton and shielding material once, it can be reused by reusing it when spraying fireproof coating on other steel columns, further reducing raw material costs. Can do. Moreover, in this invention, since the quantity of the fireproof coating material 5 used compared with the conventional synthetic covering fireproof structure also decreases, raw material cost can be reduced more.

  In addition to this, the construction labor in the present invention is greatly simplified as compared with the conventional synthetic coated fireproof structure even if the work of attaching and removing the skeleton and the shielding material is included, and the construction period is also shortened. Therefore, the construction cost can be further reduced.

  Furthermore, the final fireproof coating material surface is formed to be 125 mm or more from the inner surface of the wall material, so that the spray angle of the fireproof coating material with respect to the opposing surface can be increased, and the fireproof coating material 5 Can be sprayed more evenly. As a result, the sprayed fire-resistant coating material has no uneven coating thickness, and the surface property of the fire-resistant coating material finally obtained can be made smoother.

It is a perspective view of the covering fireproof structure after coat | covering with the coating method of the fireproof coating material with respect to the steel column to which this invention is applied. It is a plane sectional view of the covering fireproof structure after being covered with the covering method of the fireproof covering material to the steel column to which the present invention is applied. It is a flowchart of the coating method of the fireproof coating material with respect to the steel column to which this invention is applied. It is a figure which shows the process of step S11 in the flowchart of FIG. It is a plane sectional view near a steel column and a lower plate. It is a figure explaining the operation | work which bind | concludes the shielding material which consists of metal laths with a shin bone. It is a figure explaining the operation | work which binds the shielding material which consists of a metal plate with respect to a skeleton. It is a plane sectional view of the form which attached the shielding material to the shin bone. (A) is a figure which shows the example in which a clearance gap is formed between a shielding material, a wall material, and a steel frame pillar, (b) is an example arrange | positioned so that a shielding material may enter in space. FIG. It is a figure which shows the example which sprays a fireproof coating | covering material by aiming at an opposing surface with a spray gun. It is another figure which shows the example which aims at an opposing surface with a spray gun and sprays a fireproof coating material. It is a figure which shows the example which removes a shielding material and a hard bone in step S14. It is a figure which shows the example which coat | covers a fireproof coating material with a spray gun similarly about the remaining surface of a steel column. It is a figure for demonstrating the desirable space | interval of the surface of the final fireproof coating | covering material coat | covered by an opposing surface, and the inner surface of a wall material. It is a figure for demonstrating the outer diameter (phi) of a spray gun. It is another flowchart of the coating method of the fireproof coating material with respect to the steel column to which this invention is applied. It is a figure which shows the example which binds a shielding material via the strength frame constructed between the wall material and the steel column. It is a figure for demonstrating the problem of a prior art.

  Hereinafter, a method for covering a steel column to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a coated refractory structure 1 after being coated by a method of coating a refractory coating on a steel column to which the present invention is applied, and FIG. 2 is a plan sectional view thereof.

  The covered refractory structure 1 covers a refractory covering material 5 on a steel column 2 constituting a building structure such as an apartment house or a building. The steel column 2 covered with the fireproof covering material 5 is particularly intended for the one close to the wall material 3. The proximity distance of the steel column 2 with respect to the wall material 3 here is 600 mm or less.

  The steel column 2 is obtained by applying, as a column for a building structure, a steel frame having an H-shaped cross section having a predetermined plate thickness or a steel pipe having a predetermined cross-sectional rectangular shape or circular cross-section and a predetermined plate thickness. In the following example, a case where a steel pipe column having a rectangular cross section is applied to the steel column 2 will be described as an example.

  This steel column 2 plays a role of preventing the collapse and collapse of the building structure while supporting the weight of the building structure itself even in the case of a large shake caused by a large earthquake. The steel column 2 is a so-called side column provided at a position close to the wall material 3. The corner portion of the steel column 2 may be arcuate or may be substantially perpendicular. Each surface which comprises the steel column 2 is comprised by the opposing surface 2a which opposes the wall material 3, and surfaces 2b-2d other than the opposing surface 2a.

  The wall material 3 is a face material that can separate the space. This wall material may be constituted by an outer wall for separating the indoor and the outdoor of a building structure, for example, or may be constituted as a partition wall capable of separating indoor interior spaces. Also good. In the following example, a case where an outer wall is applied as the wall material 3 will be described as an example. In FIG. 2, the upper side of the wall material 3 is the outdoor side, and the lower side of the wall material 3 is the indoor side.

  The fireproof covering material 5 has fire resistance such as spray rock wool, wet spray material, and the like, and is made of a material on the premise that the steel column 2 is covered by spraying. The fireproof covering material 5 is coated with a desired thickness on the facing surface 2a and the surfaces 2b to 2d constituting the steel column 2. The coating thickness of the fireproof coating material 5 covered on the steel column 2 varies depending on the actually required fireproof time. For example, if the fireproof time is 1 hour, the coating thickness is 25 mm, if the fireproof time is 2 hours, the coating thickness is 45 mm, and if the fireproof time is 3 hours, the coating thickness may be 65 mm. For this reason, the coating thickness of the fireproof coating material 5 is actually determined based on the desired fireproof time.

  FIG. 3 shows a flowchart of a method of coating the fireproof coating material 5 on the steel column 2 to which the present invention is applied. First, in step S <b> 11, the strength bone 66 is welded to the diaphragm 6. FIG. 4 illustrates the process of step S11. The steel column 2 is usually provided with a diaphragm 6 for connecting the beam 9 and separating the steel column 2 on the upper floor and the steel column 2 on the lower floor. The diaphragm 6 includes a lower plate 61, an upper plate 62, and a panel portion 63 interposed between the lower plate 61 and the upper plate 62. In step S11, the lower plate 61 of the diaphragm 6 is used. A heel 66 is attached to the lower plate 61 by welding. The strength bone 66 is formed of a metal rod that extends in the longitudinal direction. By fixing the upper end of the strength bone 66 to the bottom surface or end portion of the lower plate 61 by welding, the strength bone 66 is arranged so that its longitudinal direction is extended in the vertical direction as shown in FIG. It becomes possible.

  FIG. 5A is a plan sectional view of the vicinity of the steel column 2 and the lower plate 61. Here, a space 20 is formed between the wall material 3 and the facing surface 2a of the steel column 2 facing this. When this space 20 is centered, one side L and the other side R are formed. That is, one side L and the other side R are located on both sides of the space 20 in plan view.

  In step S <b> 11, the fixing position with respect to the lower plate 61 of the rib 66 is only one side L or the other side R across the space 20 in plan view. In the example of FIG. 5A, a case is shown in which only two lateral ribs 66 are fixed to the lower plate 61 only on one side L. Incidentally, the width P in the space 20 in the extending direction of the wall material 3 may be any type. That is, the space 20 may be configured with a small width P as shown in FIG. 5B, for example. As a result, the space 20 is configured by a narrowed region, but may be configured by any width P as long as the side L and the side R are separated from each other.

  If the width P is small and the space 20 is narrowed, a configuration in which a shielding material 68 described later is arranged to be inclined as shown in FIG. 5B also shields one side L of the space. Therefore, it is included in the present invention.

  The number of fixed bones 66 may be any number, but by being composed of two or more, the workability can be improved in the subsequent step S13. In the case where the number of anchors of the strength bones 66 is three or more, it is desirable that the anchoring positions are substantially aligned with each other in plan view. After the fixation of the strength bone 66 is completed, the process proceeds to step S12.

  In step S <b> 12, as shown in FIGS. 6 and 7, an operation of tightening the shielding material 68 to the strength bone 66 is performed. The shielding material 68 is configured in a shape capable of shielding the fireproof coating material 5 such as a metal lath or a metal plate. FIG. 6 shows an example in which a metal lath is used as the shielding material 68. In this case, the mesh size needs to be configured so that the fireproof covering material 5 can shield to some extent. FIG. 7 shows an example in which a metal plate is used as the shielding material 68. However, the material of the metal plate may be any material, and the shape and thickness of the metal plate are such that the fireproof covering material 5 can be shielded to some extent. As long as it is, it may be composed of anything. Further, the shielding material 68 may be replaced with a metal mesh or a plate material made of any other material.

  When the shielding material 68 is tightly coupled to the stab 66, a wire 67 or the like may be used. When the shielding material 68 is composed of a metal lath, the metal lath wire rod and the strength bone 66 may be tightly coupled by a wire 67 or the like.

  In the case where the shielding material 68 is formed of a metal plate, the bone 66 may be fastened with a wire 67 or the like through a hole 69 previously formed in the metal plate.

  FIG. 8 is a cross-sectional plan view of a form in which the shielding material 68 is attached to the calcaneus 66. In the process of tightening the shielding material 68 to the force frame 66, the shielding material 68 is extended and fixed until reaching the wall material 3 or in the vicinity of the wall material 3. Thereby, one side L of the space 20 can be shielded by the shielding material 68. On the other hand, the other side R of the space 20 is opened without being shielded by the shielding material 68.

  Since the shielding material 68 is tightly coupled to the shinbone 66, the mounting position of the shielding material 68 in plan view also depends on the fixing position of the shinbone 66. By adjusting the fixing position of the strength bone 66, the attachment position of the shielding material 68 can also be adjusted. The shielding material 68 only needs to shield at least a part of the space 20. For example, as shown in FIG. 9A, a gap is formed between the shielding material 68 and the wall material 3 or the steel column 2. It may be. Further, as shown in FIG. 9B, the shielding material 68 may be disposed so as to enter the space 20. The shielding material 68 is not necessarily provided in the direction orthogonal to the wall material 3. That is, as long as at least a part of one side L of the space 20 is shielded by the shielding material 68, it may be arranged in any form. When only the other side R of the space 20 is shielded by the shielding material 68, the arrangement is the same as described above.

  Next, it transfers to step S13 and coat | covers by spraying the fireproof coating material 5 with respect to the opposing surface 2a of the steel column 2. As shown in FIG. In such a case, as shown in FIGS. 10 and 11, the fireproof covering material 5 is sprayed by aiming at the opposing surface 2 a from the other side R in the space 20 by the spray gun 25. Since the other side R is not specially shielded by the shielding material 68, it is possible to perform a spraying operation from the other side R while directing the emission port 25a of the spray gun 25 toward the opposing surface 2a.

  The fireproof covering material 5 emitted from the emission port 25a of the spray gun 25 is covered by being sprayed on the opposing surface 2a of the steel column 2. As a result, the fireproof covering material 5 to be laminated is gradually laminated in the space 20.

  The fireproof covering material 5 emitted from the emission port 25a of the spray gun 25 is shielded from the space 20 without passing through the outside of the shielding material 68. For this reason, it is possible to prevent the surroundings from being soiled during the construction process by scattering the fireproof covering material 5 out of the shielding material 68.

  The spray gun 25 sprays the fire-resistant coating material 5 onto the facing surface 2a until the coating thickness according to the actually required fire-proof time is reached. This step S13 is completed at the stage where the spraying of the refractory coating material 5 is completed over the entire opposing surface 2a until the desired coating thickness is reached. In addition, about the surface of the fireproof coating material 5 sprayed on the opposing surface 2a, you may make it adjust by pressing with the jig | tool etc. which are not shown in figure so that it may become fixed thickness.

  The same applies to the case where the side R is shielded via the shielding material 68. In such a case, the fireproof coating material 5 is coated from the side L via the spray gun 25. Similarly, the fireproof coating material 5 is covered. Is scattered outside the shielding material 68, so that it is possible to prevent the surroundings from being soiled during the construction process.

  In step S14, the shielding material 68 is removed from the calcaneus 66 as shown in FIG. Next, the strength bone 66 is removed from the diaphragm 6. As a result, one side L is opened, and the surface 2b that has been shielded by the shielding material 68 until now is opened.

  Next, the process proceeds to step S15, and the fire-resistant coating material 5 is similarly coated with the spray gun 25 on the remaining surfaces 2b to 2d of the steel column 2 as shown in FIG. The coating thickness on the fireproof coating material 5 on the surfaces 2b to 2d is also performed until the coating thickness according to the actually required fireproof time is obtained in the same manner as the facing surface 2a. About the surface of the fireproof coating material 5 sprayed on the remaining surfaces 2b-2d, you may make it adjust by pressing with the jig | tool etc. which are not shown in figure so that it may become fixed thickness.

  In step S15, after the coating of the remaining surfaces 2b to 2d to the desired coating thickness of the fireproof coating material 5 is completed, the coating method of the fireproof coating material 5 on the steel column 2 to which the present invention is applied is completed. .

In step S13, as shown in FIG. 14, the final surface 5a of the fireproof coating material 5 covered on the facing surface 2a is set to have an outer diameter φ + 75 mm or more of the spray gun 25 from the inner surface 3a of the wall material 3. It is desirable to be sprayed on. As shown in FIG. 15, the outer diameter φ of the spray gun 25 corresponds to the outer diameter of the injection portion 25b formed at the tip of the cylindrical gripping portion 25a. The outer diameter φ of the spray gun 25 varies depending on the type, but generally there are many of 20 mm to 70 mm.
The final surface 5a of the fireproof coating material 5 referred to here is a surface formed when the spraying of the fireproof coating material 5 by the spray gun 25 is completed, and it is assumed that the surface is pressed with a jig (not shown). Indicates the surface after pressing.

  From the viewpoint of workability, by setting the distance w from the surface 5a of the final fireproof covering material 5 to the inner surface 3a of the wall material 3 to be greater than the outer diameter φ + 75 mm of the spray gun 25, There are advantages described below.

  When spraying the spray gun 25, the spray angle θ with respect to the facing surface 2a can be further increased by setting the interval w to be equal to or greater than the outer diameter φ + 75 mm of the spray gun 25. As the spray angle by the spray gun 25 approaches 90 °, it becomes possible to spray the fire-resistant coating material 5 emitted from the emission port 25a more evenly onto the surface, and the coating thickness of the sprayed fire-resistant coating material 5 is reduced. Unevenness is eliminated, and the property of the surface of the fireproof covering material 5 finally obtained is further smoothed.

  The inventors of the present invention can increase the spray angle θ to such an extent that the unevenness of the coating thickness of the fireproof coating material 5 can be eliminated with respect to the opposing surface 2a by setting the interval w to be the outer diameter φ + 75 mm or more of the spray gun 25. We have confirmed experimentally what we can do. In addition, the present inventors experimented that the property of the surface of the refractory coating 5 formed on the opposing surface 2a is sufficiently smoothed by setting the interval w to be the outer diameter φ + 75 mm or more of the spray gun 25. Is confirmed.

  Furthermore, the present inventors can improve the workability by adjusting the surface of the fireproof coating material 5 by pressing it with a jig (not shown) or the like. Has been confirmed experimentally. In other words, by setting the interval w to be the outer diameter φ + 75 mm or more of the spray gun 25, it becomes easy to press a jig (not shown) by inserting the inner surface 3a of the wall material 3 from the surface 5a of the fireproof covering material 5. This is confirmed experimentally.

On the other hand, when the interval w is less than the outer diameter φ + 75 mm of the spray gun 25, the spray angle θ by the spray gun 25 cannot be increased with respect to the opposing surface 2a, and the coating thickness of the fireproof coating 5 Unevenness occurs, and the surface properties cannot be sufficiently smoothed. When the interval w is less than the outer diameter φ + 75 mm of the spray gun 25, workability cannot be improved when the surface of the fireproof coating material 5 is pressed with a jig (not shown). For this reason, it is desirable that the interval w be set to an outer diameter φ + 75 mm or more of the spray gun 25.
Note that the interval w is not particularly required to be equal to or larger than the outer diameter φ + 75 mm of the spray gun 25, and the interval w may be configured in any range.

  According to the present invention having the above-described configuration, the steel column 2 can be configured only by coating the fireproof coating material 5 to a desired coating thickness. For this reason, structurally, the number of parts can be reduced and the construction cost can be reduced as compared with the conventional synthetic coated fireproof structure. In particular, according to the present invention, it is possible to significantly reduce the strength bone 66 and the shielding material 68 from the amount required in the conventional synthetic coated fireproof structure. Moreover, after removing the strength frame 66 and the shielding material 68 once, it can be reused by reusing the fireproof coating material to the other steel column 2 to further reuse the raw material cost. Can be reduced. Moreover, in this invention, since the quantity of the fireproof coating material 5 used compared with the conventional synthetic covering fireproof structure also decreases, raw material cost can be reduced more.

  In addition to this, the construction labor in the present invention is greatly simplified as compared with the conventional synthetic coated fireproof structure, even if the work of attaching and removing the skeleton 66 and the shielding material 68 is included, and the construction period is also shortened. Therefore, the construction cost can be further reduced.

  Further, in the present invention, since the steel column 2 and the fireproof coating material 5 are separated from the wall material 3, even if the wall material 3 is damaged by a fire as in the case of a conventional synthetic coating fireproof structure, the fireproof coating is provided. It is possible to prevent the steel column 2 protected by the material 5 from being directly heated. As a result, the reliability of the fireproof performance of the steel column 2 can be improved.

  The present invention is not limited to the embodiment described above. As shown in FIG. 16, the surfaces 2b to 2d of the steel column 2 may be covered first with the fireproof covering material 5 (step S21), and then the opposite surface 2a may be covered with the fireproof covering material 5 (step). S22 to S25).

  Step S21 is the same as step S15, step S22 is the same as step S11, step S23 is the same as step S12, and step S24 is the same as step S13. The process of step S25 is the same as that of step S14. In such a case, the same effect as described above can be obtained.

  Moreover, the removal work of the shielding material 68 and the strength bone 66 in step S14 and step S25 is not essential and may be omitted. In particular, as shown in FIG. 16, in the case where the facing surface 2a is covered with the fireproof coating material 5 after the surfaces 2b to 2d are coated with the fireproof coating material 5, even if the shielding material 68 and the stab 66 are left as they are. Since it does not become a barrier for special work and the removal work of the shielding material 68 and the skeleton 66 can be omitted, the construction labor can be further reduced.

  Furthermore, in the present invention, it is not essential to cover the surfaces 2b to 2d of the steel column 2 with the fireproof coating material 5, and at least the process of coating the fireproof coating material 5 only on the opposing surface 2a of the steel column 2 (steps S11 to S13). As long as it is included.

  Note that the attachment of the strength bone 66 in steps S11 and S22 is not limited to the case where it is performed on the diaphragm 6 described above. For example, as shown in FIG. 17, a force frame 47 may be installed between the wall material 3 and the steel column 2. Then, the shielding material 68 may be tightly coupled to the erected force bone 47. For example, a member having an L-shaped cross section (not shown) provided on the inner side of the wall material 3 may be attached and the force bone 47 may be attached via the member. In particular, it is possible to dispose the force bone 47 by this method in a place where an appropriate diaphragm does not exist.

  Incidentally, when a steel pipe column having a substantially circular cross section is applied to the steel column 2, the facing surface 2 a of the steel column 2 is a location closest to the wall material 3. And the space | interval w with the opposing surface 2a needs to satisfy | fill the conditions mentioned above.

  Further, in the case where a cross-section H-section steel is used for the steel column 2, when any one of the two flanges provided at both ends of the web forms the facing surface 2a, the interval w between the facing surface 2a is It is necessary to satisfy the above-mentioned conditions.

  Hereinafter, experimental verification performed for confirming the effect of the method of covering the steel column to which the present invention is applied with the fireproof coating material will be described.

  In this experimental verification, the workability was confirmed by actually performing the spraying operation with the spray gun 25 for the interval w from the surface 5a of the fireproof coating 5 to the inner surface 3a of the wall 3. Yes.

  As shown in FIG. 14, the test conditions are such that the distance Y from the facing surface 2 a of the steel column 2 to the inner surface 3 a of the wall material 3, the coating thickness d of the fireproof coating material 5, and the above-described distance w are different from each other. And confirming workability. The workability is confirmed by having the worker actually carry the spray gun 25 to perform the spraying work, interviewing the ease of construction, and the surface of the surface after spraying the refractory coating 5 up to the coating thickness d. This was done by visually observing the properties. Further, the outer diameter φ of the used spray gun 25 was 50 mm. For this reason, the outer diameter φ + 75 mm of the spray gun 25 is 125 mm. For this reason, if w is 125 mm or more, the conditions prescribed in the present invention will be satisfied. Table 1 shows the results.

  In each of these test cases 1 to 3, the coating thickness d is set to 25 mm, and the fireproof coating material 5 uses rock wool. In Test Cases 1 to 3, w is different from each other by making the distance Y from the facing surface 2a of the steel column 2 to the inner surface 3a of the wall material 3 different from each other.

  In test case 1, w was as narrow as 75 mm, the outer diameter of spray gun 25 was less than +75 mm, and fireproof coating material 5 could not be sprayed at a suitable spray angle θ. For this reason, the fireproof covering material 5 could not be sprayed and adhered to the steel column 2.

  In test case 2 as well, w is as narrow as 100 mm, and the spray gun 25 has an outer diameter of less than +75 mm, and the spray gun 25 cannot set the spray angle θ so high that the sprayed fireproof coating 5 is repelled. Unevenness has been formed on the surface 5a.

  On the other hand, in the test case 3, w was set to 125 mm, the outer diameter of the spray gun 25 was not less than +75 mm, and the fireproof coating material 5 could be sprayed at a suitable spray angle θ. For this reason, the surface of the fireproof covering material 5 to be formed can be smoothed, and unevenness of the coating thickness was hardly observed.

  From the above results, it is shown that by making the outer diameter φ + 75 mm or more of the spray gun 25, the coating thickness of the refractory coating material 5 is eliminated, and the surface properties can be sufficiently smoothed. Yes.

  For this reason, the space | interval Y from the opposing surface 2a of the steel column 2 to the inner surface 3a of the wall material 3 is set so that the optimal space | interval w can be formed according to the coating thickness d of the fireproof coating material 5 calculated | required from fireproof time. It will follow.

Table 2 below shows the relationship between the distances Y and w necessary for expressing the desired effect of the present invention with respect to the required coating thickness d of the fireproof coating material 5 determined by laws and regulations from the fireproof time. Is shown. Also in this example, it is assumed that the outer diameter φ of the spray gun 25 used is 50 mm, and the outer diameter φ + 75 mm of the spray gun 25 is 125 mm. For this reason, if w is 125 mm or more, the conditions specified in the present invention will be satisfied.

  When the fire resistance time is 1 hour, a coating thickness d of 25 mm is required. In such a case, it is necessary to set Y to 150 mm or more in order to set w to 125 mm or more.

  When the fireproof time is 2 hours, a coating thickness d of 45 mm is required. In such a case, it is necessary to set Y to 170 mm or more in order to set w to 125 mm or more.

  When the fireproof time is 3 hours, a coating thickness d of 65 mm is required. In such a case, it is necessary to set Y to 190 mm or more in order to set w to 125 mm or more.

  That is, the covering pressure d defined according to the fireproof time is determined first. Since the interval w corresponding to the outer diameter φ + 75 mm or more of the spray gun 25 is at least 125 mm, the interval Y needs to be designed so that Y ≧ w + d.

  Incidentally, in the present invention, it is not essential to set the coating thickness d in accordance with the fire resistance time. For this reason, even if it is less than the coating thickness d according to the required fireproof time, it may be anything as long as Y is designed so that w is 125 mm or more.

DESCRIPTION OF SYMBOLS 1 Covering refractory structure 2 Steel column 3 Outer wall 5 Fireproof covering material 6 Diaphragm 20 Space 25 Spray gun 47, 66 Power frame 61 Lower plate 62 Upper plate 63 Panel part 67 Wire 68 Shielding material 69 Hole

Claims (6)

A method of coating a fireproof coating on a steel column placed close to a wall material,
A shielding step of shielding one side of the space formed between the wall material and the opposing surface of the steel column facing this with a shielding material;
A method of coating a fire-resistant coating material on a steel column, comprising: a facing surface spraying step of spraying a fire-resistant coating material with a spray gun from the other side of the space to the facing surface of the steel column. In the facing surface spraying step, the fireproof coating material is sprayed so that the surface of the final fireproof coating material coated on the facing surface is equal to or larger than the outer diameter of the spray gun +75 mm from the inner surface of the wall material. The method for coating a steel column according to claim 1 with a fireproof coating material. In the shielding step, a skeleton is constructed from the inner surface of the wall material to the steel column on one side of the space, and the shielding material is installed via the constructed skeleton. A method for coating a steel column according to 1 or 2 with a fireproof coating material. 3. The fireproof covering material for a steel column according to claim 1, wherein, in the shielding step, the shielding material is installed through a force frame extending vertically from a diaphragm attached to the steel column. Coating method. After spraying the fireproof coating material on the facing surface in the facing surface spraying step, the shielding material removing step of removing the shielding material,
The non-facing surface spraying step of spraying a fireproof coating material on a surface other than the facing surface of the steel column from which the shielding material has been removed by the shielding material removing step. A method of covering a steel column with a fireproof coating material. After spraying the fireproof coating material on the facing surface in the facing surface spraying step, the shielding material removing step of removing the shielding material and the strength bone,
4. A non-facing surface spraying step of spraying a fireproof covering material on a surface other than the facing surface of the steel column from which the shielding material and the strength frame have been removed by the shielding material removing step. Or the coating method of the fireproof coating | covering material with respect to the steel column of 4 description.

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