JP2003105890A - Fire resistive coating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire resistive coating structure easy in attaching working of a spacer and excellent in workability. SOLUTION: In the fire resistive coating structure, a plurality of the spacers 14 for forming a heat insulation layer 12 are arranged on an outer periphery of a steel-framed round column or a concrete filled steel pipe 10, a band 16 for fixing the spacer 14 is wound and arranged around an outside of the spacer 14, and a plurality of fire resistive coating materials 18 are arranged on the outside of the band 16. The fire resistive coating material 18 is fixed by a tapping screw 20 at a position where the band 16 and the spacer 14 are intersected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof coating structure such as a steel-framed round column or a concrete-filled steel pipe.

[0002]

2. Description of the Related Art Conventionally, as a fireproof coating structure for a steel-framed round column or a concrete-filled steel pipe, after spraying or trowel coating a fireproof coating material on the column, a steel base material is incorporated on the outside of the column and a top board is attached to this. There are a structure and a structure in which a base material made of steel or an inorganic refractory material is attached to the outer peripheral surface of a column, and a fire resistant coating material having an arc-shaped cross section is concentrically fixed to the base material.

In the latter fire-resistant coating structure, generally, the fire-resistant coating material is fixed to a steel base material such as a lightweight grooved steel, which is fixed to the outer peripheral surface of the column by welding, by using tapping screws. The specific example is shown below.

In Japanese Unexamined Patent Publication (Kokai) No. 11-193580, a spacer made of a refractory inorganic molding is fixed to the outer peripheral surface of a steel-framed round column or a concrete-filled steel pipe, and a base material is formed by bonding a steel plate to the surface of the spacer. There is disclosed a technique relating to a fireproof coating structure in which a fireproof coating material having an arc-shaped cross section is fixed to the base material by a tapping screw.

Further, Japanese Utility Model Publication No. 07-6312 discloses that
In a fire-resistant coating structure of a steel-framed round pillar that surrounds the circumference of a steel-framed round pillar that constitutes the frame of a building with a cylindrical fire-resistant covering portion, with a cylindrical fire-resistant covering portion, the cylindrical fire-resistant covering portion is a longitudinal joint from an arc-shaped fire-resistant covering material. Are assembled in line with each other, and a light weight grooved steel is installed along the longitudinal seam of the cylindrical refractory cladding in the circumferential gap between the steel round column and the cylindrical refractory cladding. There is disclosed a technique related to a fireproof coating structure of a steel-framed round pillar, in which each end portion of an arc-shaped fireproof coating material forming a cylindrical fireproof coating portion is fixed to the lightweight grooved steel by a tapping screw.

Further, Japanese Utility Model Laid-Open No. 07-10123 is provided with a cylindrical fireproof coating portion of one or a plurality of steps which covers the circumference of a steel-framed round column with a clearance, and the fireproof coating portion of each step is Through a seam so as to form a cylinder, a plurality of arc-shaped fireproof coating material connected, and a plate-shaped metal object arranged so as to cross the seam for each seam on the back surface side of the fireproof coating material forming a cylinder, The plate-shaped metal object is integrally assembled with tapping screws for fixing and fixing it to each of the fire-resistant coating materials, and the back surface is adhesively fixed to the steel-framed round pillar between the steel-framed round pillar and the cylindrical fire-resistant covered section, and the front surface is a plate. Disclosed is a technique related to a fireproof coating structure of a steel-framed round pillar, in which a gap holding block (spacer) in contact with a metal plate is arranged for each plate metal product.

[0007]

However, the above-mentioned conventional techniques have the following problems, respectively. Generally, in the conventional fireproof coating structure of steel-framed round pillars or concrete-filled steel pipes, in the case of a structure in which a fireproof coating material is sprayed or troweled and then a steel base material is embedded on the outer side of the steel board Since a large space is required for mounting the material, the pillar becomes thick, the effective floor area in the room is reduced, and it takes time because the construction is a combination of the wet construction method and the dry construction method. Also, in the case of a structure in which a steel base material such as lightweight grooved steel is attached to the outer peripheral surface of the column and the arc-shaped fireproof coating material is fixed concentrically to the base material, a specialist in welding the steel base material is required. In addition, the sparks generated during welding work need to be cured, and there is a problem in workability.

As a concrete technique, Japanese Patent Laid-Open No. 11-
In the structure of Japanese Patent No. 193580, since the spacer and the steel plate need to be fixed by adhesion, respectively, the steel material cannot be adhered to the surface of the adhesive until the adhesive used for fixing the spacer is cured, and the work becomes complicated. There were many things.

Further, in the structure of Japanese Utility Model Laid-Open No. 7-6312, since the fireproof coating material is fixed by screwing in the tapping screw, in order to prevent the light weight grooved steel which is the base material from being warped, the screwing position is different. The packing material (spacer) made of calcium silicate needs to be accurately arranged, the fixing of the fireproof coating material is complicated, and there is a problem in its workability.

Further, in the fireproof coating structure of Japanese Utility Model Laid-Open No. 07-10123, when the tapping screw is screwed in from the front surface, there is no base material on the back side of the plate-shaped metal article at this screw-in position, so that the plate-shaped metal article is In some cases, it became difficult to firmly connect the refractory coating materials such as floating.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a fireproof coating structure in which the work of attaching the spacer is easy and the workability is good.

[0012]

In order to achieve the above object, the present invention provides a plurality of spacers for forming a heat insulating layer on the outer circumference of a steel-framed round column or a concrete-filled steel pipe, and the spacers are provided on the outer side of these spacers. A fireproof coating structure is provided in which a band for fixing the spacer is wound and disposed, and a plurality of fireproof coating materials are disposed on the outside of the band.
Further, the spacer is an inorganic refractory material sandwiched between U-shaped or U-shaped cross-section steel materials, and the U-shaped or U-shaped cross-section steel material does not come into contact with the steel round column or concrete-filled steel pipe. It is preferable to arrange them. Also, preferably,
The refractory coating is fixed at the intersection of the band and the spacer. Further, preferably, the joint of the refractory coating is located on the band or the spacer. Further, the band may be made of a metal plate, an inorganic fiber cloth or a non-woven fabric. Further, the heat insulating layer may be an air layer or an inorganic fiber filling layer.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A fireproof coating structure according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1. As shown in FIGS. 1 to 3, in the fireproof coating structure, a plurality of spacers 14 made of an inorganic refractory material for forming the heat insulating layer 12 are provided on the outer periphery of the steel frame column or the concrete-filled steel pipe 10 so as to be spaced from each other. In addition, a band 16 for fixing the spacer 14 is wound around the spacer 14 and arranged, and a fireproof coating material 18 is further arranged on the outer periphery thereof.

Here, the steel-framed round pillar is a circular steel tube pillar having a hollow inside, and the concrete-filled steel tube is a pillar in which concrete is filled inside the steel tube. In addition,
The present invention is not limited to such a member, but can be widely applied as long as the member has a circular cross section.

In this embodiment, four spacers 14 are provided, and each spacer 14 is a columnar member made of an inorganic refractory material and having a substantially rectangular cross section. More specifically, the surface of each spacer 14 that is in contact with the steel-framed round pillar or the concrete-filled steel pipe 10 may be slightly curved corresponding to the curvature of the outer peripheral surface of the steel-framed round pillar or the concrete-filled steel pipe 10. The range of the thickness of 14 in the outer peripheral direction is not particularly limited, but is 10 to 100 mm.
It is a degree. As the inorganic refractory material, calcium silicate-based, gypsum-based, cement-based molded plates or molded products thereof, and fiber-reinforced products thereof are suitable.

The band 16 wound so as to surround the four spacers 14 is a strip-shaped member made of a metal plate such as a steel plate, a galvanized steel plate, a stainless plate, or an inorganic fiber cloth such as a glass cloth or a ceramic cloth or a non-woven fabric. is there. After the band is wound, it is fixed with screws, staples, rivets, pins, buckles, wires or the like.

The fireproof coating material 18 arranged around the band 16 is made of a fireproof molding material such as a molding plate made of calcium silicate or a gypsum-based molding plate. Further, the fireproof coating material 18 is a two-part type and is a curved wall-shaped member having a semicircular cross section.

Next, the construction of the fireproof coating structure having the above construction will be described. First, the four spacers 14 are arranged on the outer peripheral surface of the steel-framed round pillar or the concrete-filled steel pipe 10. Each spacer 14 is arranged so as to extend substantially along the longitudinal direction of the steel-framed round pillar or the concrete-filled steel pipe 10. Further, the four spacers 14 are arranged so as to be spaced at equal intervals (equal angles) in the circumferential direction of the steel frame round pillar or the concrete-filled steel pipe 10. Next, the band 16 is wound so as to surround these spacers 14. Since the four spacers 14 are fixed to the steel-framed round pillar or the concrete-filled steel pipe 10 at a time only by winding the band 16 in this manner, the spacers can be easily attached as compared with the conventional one, and the workability is very good. There is. Further, since the spacer 14 is finally fixed by the band instead of the adhesive, it is not necessary to wait for the next work until the adhesive is cured as in the conventional case, and the construction is not complicated.

Next, a plurality of fireproof coating materials 18 are provided so as to cover the outer peripheral surface of the steel-framed column or the concrete-filled steel pipe 10 to which the spacer 14 and the band 16 are attached as described above.
To place. At this time, joints 18a of the fireproof coating 18 in the circumferential direction of the steel-framed round column or the concrete-filled steel pipe 10
Are located above the spacers 14, and the joints 18b of the fireproof covering 18 in the longitudinal direction of the steel round column or the concrete-filled steel pipe 10 are located above the band 16 so that the plurality of fireproof coverings 18 are provided. Make the arrangement. As a result, the spacers 14 or the bands 16 are arranged on all the joint back surfaces of the plurality of fireproof coating materials 18, so that the fireproof performance can be improved. Also, the fireproof coating material 1
By arranging 8 on the outer side of the spacer 14, a heat insulating layer 12 is formed between the fireproof coating material 18 and the steel frame round pillar or the concrete-filled steel pipe 10. After the placement of the fireproof covering material 18 is completed, the fireproof covering material 18 is fixed by a plurality of tapping screws 20. The position where the tapping screw 20 is driven is a position where the band 16 and the spacer 14 intersect with each other, whereby each tapping screw 20 engages with both the band 16 and the spacer 14. Therefore, since the tapping screw 20 is driven into the spacer 14 to prevent the refractory coating material 18 from being depressed or distorted, it is possible to maintain a predetermined space between the steel frame column or the concrete-filled steel pipe 10. In addition to this, the fireproof coating material 18 can be firmly attached. Further, since the tapping screw 20 penetrates the hard band 16 and is screwed into the spacer 14, the screwing of the tapping screw 20 is suitably restrained by the band 16, and the fireproof coating material 18 can be firmly attached. Also, band 16
Is extended in the circumferential direction of the steel-framed round column or the concrete-filled steel pipe 10, and the spacer 14 is extended in the longitudinal direction of the steel-framed round column or the concrete-filled steel pipe 10.
The position where 6 and the spacer 14 intersect can be easily grasped,
Workability is improved.

As described above, since the band 16 has not only the function of fixing the plurality of spacers 14 at one time but also the function of firmly restraining the tapping screw 20 as described above, the work of mounting the spacers is easy. However, it becomes possible to firmly attach the fireproof coating material, and in addition, the parts required only for screw restraint as in the past (for example,
It is not necessary to prepare a steel plate, a light-weight grooved steel, a plate-shaped metal object, etc., and the number of parts and the construction process can be reduced.

Embodiment 2. Next, a fireproof coating structure according to Embodiment 2 of the present invention will be described with reference to FIG.
The fire-resistant coating structure according to the second embodiment is the same as the fire-resistant coating structure of the above-described first embodiment, in which a spacer sandwiched between U-shaped steel materials 22 is arranged on a part of the outer periphery of the inorganic fire-resistant material 15. A steel material 22 is provided on the threaded side of the tapping screw 20 of each spacer, and is arranged so that the steel material 22 does not come into contact with a steel-framed round pillar or a concrete-filled steel pipe. The steel material 22 may be a metal material such as a steel plate, a galvanized steel plate, and a stainless steel plate that is processed and shaped so that its cross section has a U-shape, or a commercially available steel material. Further, the engagement between the steel material 22 and the inorganic refractory material 15 is facilitated by pushing the inorganic refractory material 15 into the steel material 22 such that the inorganic refractory material 15 is sandwiched inside the U-shaped portion of the cross section without using an adhesive. To be done. Also in the fireproof coating structure according to the present embodiment, as in the first embodiment, the plurality of spacers are fixed at once by the band, and the tapping screws are firmly restrained, so that the spacer installation work is easy. In spite of this, it becomes possible to firmly attach the fireproof coating material. Further, since the steel material 22 and the inorganic refractory material 15 are engaged with each other without using the adhesive as described above, it is not necessary to wait for the next work until the adhesive is hardened as in the conventional case. Therefore, the ease of the work of attaching the spacer is not hindered. Furthermore, since the steel material 22 also restrains the screwing of the tapping screw 20, the tapping screw 20 and the fireproof coating material 18 can be held more firmly.

The cross-sectional shape of the steel material is shown in FIGS.
Is not limited to the U-shape as shown in FIG. 5A, but the U-shape as shown in FIG. 5B or the U-shape as shown in FIG. Other shapes such as a steel material can be sandwiched.

Other Embodiments. The present invention is not limited to the embodiment described above, and for example,
It can also be carried out by modifying it as follows. First, a steel-framed round pillar or concrete-filled steel pipe 10 and a fireproof coating 18
Although the heat insulating layer 12 formed between and is an air layer in the above-mentioned embodiment, it is not limited to this, and the heat insulating layer is filled with an inorganic fiber heat insulating material such as rock wool, glass wool, or ceramic wool. However, in this case, the thickness (outer diameter) of the entire fireproof coating structure can be reduced. Further, the fire-resistant coating material is not limited to the semi-arc-shaped two-division type, but may be implemented in a fan-shaped three-division type or more. Further, the fireproof coating material is preferably equally divided, but is not particularly limited.

Furthermore, the number, shape and arrangement of the spacers are not limited to those in the above embodiment. Therefore, for example, less than three spacers or five or more spacers may be arranged at the same height. Further, the spacer is not limited to one that continuously extends in the longitudinal direction of the steel-framed round pillar or the concrete-filled steel pipe 10, but as shown in FIG. Alternatively, a plurality of spacers 114 may be arranged separately. Further, as shown in FIG. 7, a plurality of spacer means 224 composed of a pair of spacer pieces 224a, 224b adjacent in the circumferential direction may be arranged.

[0026]

As described above, according to the fireproof coating structure of the present invention, since the spacer can be finally fixed only by winding the band, the spacer can be attached more easily and the workability can be improved as compared with the conventional one. It is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fireproof coating structure according to a first embodiment of the present invention.

FIG. 2 is a view showing the vicinity of joints of the fireproof coating material in FIG.

FIG. 3 is a perspective view of the fireproof coating structure according to the first embodiment of the present invention.

FIG. 4 is a view similar to FIG. 2 regarding a fireproof coating structure according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a variation of a steel material regarding the fireproof coating structure according to the second embodiment of the present invention.

FIG. 6 is a view showing a variation of spacers in the fireproof coating structure of the present invention.

FIG. 7 is a diagram showing a variation of spacers in the fireproof coating structure of the present invention.

[Explanation of symbols]

Reference numeral 10 ... Steel round column or concrete-filled steel pipe, 12 ... Thermal insulation layer, 15 ... Inorganic refractory material (spacer), 14 ... Spacer, 16 ... Band, 18 ... Fireproof coating material, 18a, 18b
... joints, 20 ... tapping screws, 22 ... steel material (spacer).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masafumi Fuji             6-1 Kashiwara, Ishioka City, Ibaraki Prefecture Co., Ltd.             Building Materials Technology Laboratory (72) Inventor Kazuo Sakamoto             6-1 Kashiwara, Ishioka City, Ibaraki Prefecture Co., Ltd.             Building Materials Technology Laboratory F-term (reference) 2E001 DE01 DE03 FA02 GA07 GA26                       GA28 HA03 HA21 HB01 HB02                       HB03 JA22 JA28 LA01 LA12

Claims (6)

[Claims] 1. A plurality of spacers for forming a heat insulating layer are arranged at intervals on the outer circumference of a steel-framed round column or a concrete-filled steel pipe, and a band for fixing the spacers is wound on the outside of these spacers. Is placed and
A fireproof coating structure in which a plurality of fireproof coating materials are arranged on the outside of the band. 2. The spacer is an inorganic refractory material sandwiched between U-shaped or U-shaped cross-section steel materials, and the U-shaped or U-shaped cross-section steel material abuts a steel-pillar round pillar or concrete-filled steel pipe. The refractory coating structure according to claim 1, wherein the refractory coating structure is arranged so as not to. 3. The fireproof coating structure according to claim 1, wherein the fireproof coating material is fixed at a position where the band and the spacer intersect with each other. 4. The fireproof coating structure according to claim 1, wherein the joint of the fireproof coating is located on the band or the spacer. 5. The fireproof coating structure according to claim 1, wherein the band is made of a metal plate, an inorganic fiber cloth or a non-woven fabric. 6. The fireproof coating structure according to claim 1, wherein the heat insulating layer is an air layer or an inorganic fiber filled layer.