JPH0740824U - Fireproof coating structure - Google Patents

Abstract

(57) [Summary] [Purpose] Achieves quick and easy construction without the need for skilled technology, and greatly reduces the scattering and dropping of sprayed refractory coating materials. [Structure] On the upper flange portion 22 of the steel frame beam 20 that supports the concrete slab 10 of the building, the fire-resistant molded body 30,
It is closely attached from both sides with the upper flange 22 in between.
It is fixed by glue or welding pins. As a result, the side surface and the lower surface of the upper flange portion 22 and the upper end portion of the web 21 are covered. Further, the fire resistant molded body 31 is fitted into the lower flange portion 23 from both sides with the lower flange portion 23 interposed therebetween, and covers the lower flange portion 23 and the lower end portion of the web 21. Further, each molded body 30, 31 in the web 21
The fire-resistant coating material 40 is applied to the central portion other than the upper and lower end portions covered by (4) by a spraying method.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coating structure for ensuring the fire resistance of a steel frame used as a beam or a pillar in a building or the like.

[0002]

[Prior art]

 Generally, the steel frame of a building has a fire-resistant coating on its entire outer surface, because if it is affected by a high heat such as a fire, it may be deformed by heat and may cause the building to collapse.

Conventionally, as a fire-resistant coating structure of a steel frame, as shown in FIG. 3, a caul plate 62 is attached to a flange edge portion 61 of an H-shaped or I-shaped steel frame 60 with a fire-resistant adhesive material to form a steel frame 60. In another part, there is a spray-coated fireproof coating 63 (see Japanese Utility Model Publication No. 54-33297). The spray material 63 is sprayed so as to have the same thickness as that of the contact plate 62, thereby reducing spray loss. Further, the inner side surface 64 of the contact plate 62 which is in contact with the spray material 63 is an inclined surface which is cut inward and serves to hold the spray material 63 in a wedge shape.

Further, as shown in FIG. 4, a molded plate 82 for fireproof coating is provided on the edge portion of the lower flange 81 of the H-shaped or I-shaped steel beam 80 by a mounting bracket 83 such as a glaze or a stable. There is one in which a side forming plate 84 is attached to the edge portion of the forming plate by a fixing member 85 such as a nail (see Japanese Utility Model Laid-Open No. 63-67110). The lower surface and the edge of the lower flange 81 of the steel beam 80 are covered with these forming plates 82 and 84, and the remaining exposed portion of the steel beam 80 is sprayed with a spray material 8 6 for fireproof coating. To be covered.

[0005]

[Problems to be solved by the device]

 Among the above-mentioned conventional steel frame fireproof coating structures, in the structure shown in FIG. 3 of Japanese Utility Model Publication No. 54-33297, the inner surface 64 of the backing plate 62 is an inclined surface that is cut into the inside, so that the spray material Although it is possible to prevent the falling off of the sprayed material 63 after drying, there is a problem that the spraying material 63 is inevitably scattered and dropped during spraying. That is, when the fireproof coating is performed by the spraying method, there is no restriction on the shape of the construction site in the steel frame, and even if there is a hole for passing the pipe, for example, only the hole part is left and the Although it can be easily installed with, the sprayed material tends to scatter and fall with spraying, and it is particularly difficult to spray onto the lower surface of the steel frame, so skilled construction technology and There was a problem that it took a lot of labor and time.

Further, in the structure shown in FIG. 4 described in Japanese Utility Model Laid-Open No. 63-67110, at the time of construction, each of the molding plates 82 and 84 formed in conformity with the outer shape of the steel frame 80 is attached to the mounting bracket 83 or fixed. The member 85 must be attached at an appropriate place, which requires a lot of labor and time. If the joints of the molded bodies 82 and 84 are not aligned accurately, the joints may open when exposed to high heat from a fire, etc., and the fire resistance may be significantly reduced. I needed it.

The present invention is a fireproof coating that can be installed quickly and easily without requiring skill, and can greatly reduce the scattering and dropping of the fireproof coating material caused by spraying. It is intended to provide a structure.

[0008]

[Means for Solving the Problems]

 The above object of the present invention is to cover a predetermined flange portion of a steel frame beam by fitting a fire resistant molded body formed according to its outer shape, and to cover the other portion of the steel frame beam with an inorganic fiber and It is achieved by coating by spraying a refractory coating containing a binder as a main component.

[0009]

[Action]

 In the fireproof coating structure according to the present invention, since the predetermined flange portion of the steel frame beam is covered by fitting the fireproof molded body which is molded according to its outer shape, the fireproof coating of the flange portion is A fire resistance equal to or better than the case where a fire-resistant molded plate such as a fire-resistant board is used is secured. Moreover, the fireproof coating work on the flange portion can be performed quickly and easily.

[0010]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a view showing a fireproof coating structure according to a first embodiment of the present invention. In this figure, a steel beam 20 supporting a concrete slab 10 of a building is an H-shaped steel in which an upper flange portion 22 and a lower flange portion 23 are formed at upper and lower ends of a web 21, and an upper flange portion 22 and a lower flange portion 23 are formed. The flange portion 23 is coated with the fire-resistant moldings 30 and 31, respectively, and the web 21 is coated with the fire-resistant coating material 40 by spraying.

The fire-resistant molded body 30 is molded into a shape like an L-shaped cross section along the side surface and the lower surface of the upper flange portion 22 of the steel frame beam 20, respectively. Each molded body 30 is closely adhered to the side surface and the lower surface of the upper flange portion 22 from both sides, and is fixed by an adhesive or a welding pin (not shown), and the side surface and the lower surface of the upper flange portion 22 and the upper end portion of the web 21. To cover. When fixing each molded body 30 with a welding pin, a pin for fixing the molded body is welded to the steel beam 20 in advance, and a hole is formed in the molded body 30 at a portion corresponding to the pin. The molded body 30 is mounted on the steel frame beam 20 so that the pin can be inserted into the hole, and the head for preventing the dropout is fixed to the pin.

Each of the fire-resistant molded bodies 31 is molded in a substantially U-shaped cross section in accordance with the outer shape of the lower flange portion 23 forming the lower surface of the steel beam 20, and the lower flange portion 23 is sandwiched between them. Thus, the lower flange 23 and the lower end of the web 21 are covered by fitting from both sides. Each molded body 31 is easily fixed to the steel frame beam 20 by fitting it into the lower flange portion 23, but an adhesive agent, a welding pin (not shown), or the like may be used if necessary. The structure for fixing the molded body 31 with the welding pin is the same as above.

The material of each of the molded bodies 30 and 31 is not particularly limited as long as it has a fire resistance equivalent to that of a fire resistant board, but heat resistant inorganic fibers, cement and a filler are used. The main component is a slurry, and more preferably, the same material as the fire-resistant coating material 40 described later. The molding method may be a batch type in which one mold is used to mold one by one, or continuous molding in which the material is sequentially poured into a large number of molds arranged on a conveyor.

The fireproof coating material 40 is applied to the central portion of the web 21 excluding the upper and lower end portions covered by the molded bodies 30 and 31 by a spraying method. As the fire-resistant coating material 40, a material mainly composed of inorganic fibers such as rock wool, ceramic fibers and glass wool and a binder such as cement is preferably used.

It should be noted that, in a state where each molded body 31 is fitted to the lower flange portion 23 of the steel frame beam 20, there is a fire resistant cover in a gap formed between each molded body 31 along the longitudinal direction of the steel frame beam 20. A joint treatment material 50 made of the same material as the covering material 40 is injected. As a result, even if a high heat is applied due to a fire or the like, the gap does not open, and therefore high fire resistance performance can be secured.

The operation of this embodiment will be described. In this embodiment, each molded body 30 is closely attached to the upper flange portion 22 of the steel beam 20 from both sides with the upper flange portion 22 sandwiched therebetween, and each molded body 31 is connected to the lower flange portion 23 with the lower flange portion 22. Since the fireproof coating is performed by fitting from both sides with the portion 23 sandwiched therebetween, the fireproof coating work of the flange portions 22 and 23 can be performed quickly and easily. Further, the fire resistance performance equal to or higher than that in the case where a fire resistant molded plate such as a fire resistant board is used for the fire resistant coating of the flange portions 22 and 23 is ensured.

As described above, according to the first embodiment, the upper flange portion 22 and the lower flange portion 23 of the steel beam 20 are covered by fitting or adhering the fireproof molded bodies 30 and 31, respectively, and Since the web 21 is covered by applying the fire-resistant coating material 40 by the spraying method, for example, as compared with a structure in which a large number of fire-resistant formed plates are attached to the outer surface of the steel beam so that no gap is formed at the seam. It can be installed quickly and easily without the need for skilled technology. Further, since the fire-resistant coating material 40 is not sprayed on the upper flange portion 22 and the lower flange portion 23, it is possible to suppress the scattering and the drop due to the spraying of the fire-resistant coating material 40. Further, it is possible to ensure excellent fire resistance performance of a fire resistance time of 2 to 3 hours, which is equivalent to a structure in which the entire outer surface of the steel frame beam 20 is covered with the fire resistant molded body.

FIG. 2 is a view showing a fireproof coating structure for a steel frame beam according to a second embodiment of the present invention. In this figure, a molded body corresponding to the fire resistant molded body 30 of the first embodiment described above is not provided, and the upper flange portion 22 of the steel beam 20 is coated with the fire resistant coating material 40 by the spraying method. It will be constructed. Other configurations are the same as those in the first embodiment.

That is, the fire-resistant molded body 31 is fitted into the lower flange portion 23 of the steel beam 20 from both sides with the lower flange portion 23 interposed therebetween, and covers the lower flange portion 23 and the lower end portion of the web 21. Further, a fireproof coating material 40 is applied by a spraying method on the side surface and the lower surface of the upper flange portion 22 of the steel frame beam 20 and the portion of the web 21 other than the lower end portion covered with each molded body 31.

As described above, according to the second embodiment, the lower flange portion 23 of the steel beam 20 is covered by fitting the fire resistant molded body 31 and the fire resistant covering material 40 is sprayed. Since the upper flange portion 22 and the web 21 are covered by performing the work by, the work can be done more quickly and easily without requiring a skilled technique.

[0021]

[Effect of device]

 According to the present invention, a predetermined flange portion of a steel frame beam is covered by fitting a fire-resistant molded body formed according to the outer shape of the steel frame beam, and the other portion of the steel frame beam is covered with the inorganic fiber and the bond. Since the fire-resistant coating material containing the fire-retardant material as the main component is covered by spraying, it can be installed quickly and easily without the need for skillful techniques. Etc. can be significantly reduced.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a fireproof coating structure according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional fireproof coating structure.

FIG. 4 is a cross-sectional view showing a conventional fireproof coating structure.

[Explanation of symbols]

 20 Steel Frame (Steel Beam) 21 Web 22 Upper Flange Part 23 Lower Flange Part 30 Fireproof Molded Body 40 Fireproof Covering Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuo Oguni 1-5 Otsuka, Inzai-cho, Inba-gun, Chiba Incorporated Takenaka Corporation Technical Research Institute (72) Inventor Ichizo Yoshikawa 8-21 Ginza, Chuo-ku, Tokyo No. 1 Stock Company Takenaka Corporation Tokyo Main Store (72) Inventor Takao Hioki 2-29-1 Shimotakaido, Suginami-ku, Tokyo (72) Inventor Masahiko Tsuneya 7-6 Suzuya, Yono-shi, Saitama (72) Inventor Person Shoichiro Shirai 2-25-6 Sugita, Isogo-ku, Yokohama-shi, Kanagawa (72) Inventor: Ryutaro Yokoyama 4-1000 Matsumi-cho, Kanagawa-ku, Yokohama-shi, Kanagawa

Claims (1)

[Scope of utility model registration request] 1. A predetermined flange portion of a steel frame beam is covered by fitting a fire resistant molded body formed according to the outer shape thereof, and the other portion of the steel frame beam is covered with an inorganic fiber and a binder. A fireproof coating structure for steel beams, characterized by being coated by spraying a fireproof coating material containing as a main component.