JPH09328836A - Fire-resistive construction and execution method in intermediate-layer combined building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the period of the execution of works by covering a column, a ceiling beam, etc., with a fire resisting material as a steel-framed structure by a general steel material in a first floor section and manufacturing the column and a floor beam and the ceiling beam a fire of a fire-resisting steel material as steel-framed unit structure in upper floors higher than a second floor. SOLUTION: Columns 12 consisting of a general steel material are assembled onto foundations 11 and covered with fire resisting materials 16, and ceilling girders 13, ceiling beams 14, etc., covered with the fire resisting materials 16 and a first floor section 10 is formed. An upper 20 is formed by connecting a room unit 21, the room unit 21 has the frame works of columns, floor beams 23, ceiling beams 24, etc., and each column and beam material is manufactured of a fire-resisting steel material. The surfaces of the columns of each room unit 21 are covered with external wall materials 25 and fire-resisting internal wall materials 28, and the floor materials 26 of ALC panels are installed onto the top face sections of lower flanges in the floor beams 23. Accordingly, a frontage is spread for utilizing the first floor section as a shop, and sections among the columns can be taken in wide areas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conventional combined building of a steel structure part and a unit structure part, and particularly in middle and high-rise buildings, the first floor part thereof is used as a store or warehouse, and the second floor It is characterized by a fireproof structure in a middle-rise building in which the above upper floors are used for ordinary houses.

[0002]

2. Description of the Related Art Conventionally, in general middle-rise buildings, buildings having a steel frame structure are the mainstream. On the other hand, in recent years, so-called unit houses have come into widespread use centering on ordinary houses or middle- and high-rise buildings for houses. However, in the above-mentioned conventional general steel structure building and unit structure house, both have advantages and disadvantages, and particularly in middle and high-rise buildings, there are also restrictions on the fire resistance performance under the Building Standards Act, and in view of the relationship with building costs, etc. There are some points that cannot necessarily be said to be a satisfactory building.

That is, if all floors of a middle- and high-rise building have a unit structure and the unit has a fireproof structure by the membrane method, there are certainly many advantages in the building process or the fireproof coating process in the factory of the unit itself. However, for example, in a so-called combined building in which the first floor of the building is used as a store or a warehouse, it is extremely difficult to form a large space without pillars or walls.

On the other hand, if all the upper floors are constructed by the conventional construction method using general steel materials, for example, a large amount of time and labor is spent on fireproof coating for fire protection, which is not economical in terms of construction cost and construction period. Even if the unit structure using general steel materials is combined, there are various problems such as increase in weight due to fireproof structure, narrowing of room space, and ceiling height limitation.

[0005]

In view of the above points, the present invention is a middle-rise house in which the first floor can be used as a store or warehouse, and the upper floor can be used as a house, especially considering its fireproof structure. It also provides a building structure that has advantages in terms of construction period, construction cost, etc. A first object of the present invention is to provide a structure in which a frontage of a building can be widened and a space between pillars can be widened in order to use the first floor as a store, for example. A second problem is to unitize the upper layers of the second floor and above in order to reduce the construction cost of the entire building as much as possible and shorten the construction period. More importantly, considering the vibration resistance of the entire building,
It is to construct a house / combination building that has excellent habitability by fully considering building standards by improving fire resistance.

[0006]

The building of the present invention has a steel frame structure of the first floor portion of which is a general steel material, and the steel columns such as columns and ceiling beams are covered with a necessary refractory material for each steel frame,
The upper floors above the second floor have a steel frame unit structure,
A middle-layer combination characterized in that the pillars, floor beams, and ceiling beams in the unit structure of the upper floor are made of fire-resistant steel material (FR steel material), and that the unit structure adopts a surface-covered fire-resistant structure by the membrane method. It is a fireproof structure of the building.

[0007]

According to the present invention, by adopting the above-mentioned structure, the steel frame structure made of conventional general steel material is adopted in the first floor portion, so that the room and frontage of the first floor portion can be widened, and the ceiling is further increased. The height can also be freely designed, and the degree of freedom of design in stores etc. is improved, and the steel pillar,
High fireproof performance can be economically adopted by separately providing fireproof coating on the beams and the like.

Furthermore, by adopting a unit structure in the upper-floor residential section, it is possible to economically shorten the construction period. Moreover, the fireproof steel material (FR steel material) is adopted as the pillars and beams of the unit structure, and the membrane method is adopted as the fireproof covering means, so that the room space can be expanded and the ceiling height can be sufficiently increased regardless of the unit structure. It is possible to obtain a middle-rise building that doubles as a house that can be secured.

By the way, the "fire-resistant steel material (FR steel material)" referred to in the present specification means that the high temperature proof stress is greatly improved by adding an alloy such as chromium or molybdenum to general steel, which was developed around 1988. For steel materials, for example, the yield point at high temperature of general steel materials falls to 2/3 of the standard value of the yield point at room temperature at around 350 ° C, and falls below the proof stress required for buildings at the time of fire. In the fire-resistant steel material (FR steel material), the yield point at high temperature has a long-term allowable stress level of 60.
The temperature is maintained up to 0 ° C.

Since the fire temperature is generally about 1000 ° C., the conventional fire resistant coating that requires heat insulation up to 350 ° C. is a fire resistant steel (FR steel).
According to the method, heat insulation up to 600 ° C is sufficient, and the fireproof coating is greatly reduced. Therefore, the upper floor portion in the present invention is required to use the above-mentioned refractory steel material (FR steel material) as at least the floor beam and ceiling beam material of the unit structure.

Furthermore, it is premised that a surface coating structure by the membrane method is adopted as the fireproof coating means for the floor and ceiling portions in the unit structure of the upper floor. That is, coating the entire frame of each unit structure individually with the refractory material extremely complicates the working process, and this is surface-coated by the membrane method.

However, in order to use a fire resistant material as the inner wall material and the ceiling wall material in the unit structure and to have sufficient fire resistance, the membrane method is not the most suitable as the fire resistant coating method for conventional general steel materials. there were. This is because if the inner wall material, ceiling wall material, etc. in the membrane method are made of thick fireproof plates, it is difficult to keep the ceiling height in the room sufficiently high, especially due to restrictions on transportation of the unit. There was a problem that the narrowing of space was unavoidable.

Therefore, in the unit structure of the upper floor in the present invention, by combining the characteristics of the refractory steel material (FR steel material) and the characteristics of the membrane method, the above problems can be solved and a sufficient ceiling height can be obtained. A fire resistant structure is obtained in each unit structure of a unit building which has a sufficient space and a sufficient fire resistance while being easy to construct. Furthermore, in the unit structure portion of the present invention, a floor plate composed of ALC panels of each unit structure is fixed to the upper side of the lower flange portion of the floor beam made of refractory steel,
The entire floor can be made to have a low structure, and the ceiling height in the room space can be made higher despite the limitation due to the unit structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining an embodiment with reference to the drawings, FIG. 1 schematically shows a three-story building in a combination of a general steel structure and a unit structure according to the present invention. In the figure, the first-floor portion 10 has a structure in which a frame made of ordinary steel is coated with an appropriate fireproof coating, which is well known in the related art. A three-story combined building having an upper layer portion in which a plurality of unit structures 20 are connected vertically and horizontally is shown above the first floor portion 10 of the general steel frame structure. Reference numeral 21 in the drawing indicates a roof portion of the uppermost floor unit.

FIG. 2 relates to a combined building according to the present invention similar to that of FIG. 1, and the first floor portion 10 is shown in FIG.
Exactly the same structure as the example, wide pillars, frontage,
The figure shows a steel structure part using general steel that allows the ceiling height to be freely designed. On the upper floor, the unit structure 20 is stacked in three steps to form a four-story combined building.

FIG. 3 shows an outline of a vertical section of the three-story combination building shown in FIG. 1, in which a pillar 12 made of a general steel material constituting the first floor portion 10 is assembled on a foundation 11.
Each is coated with the required refractory material 16. Similarly, the ceiling girder 13, the ceiling girder 14, and the like are individually covered with the refractory material 16. These refractory coating materials may be well known in the art, without exemplifying them. Further, the first floor portion 10 can be surrounded by an outer wall material 15 thereof, for example, an ALC panel or the like.

The upper floor 20 is constructed by connecting room units 21 constituting each floor, and each room unit 21 has a framework of columns 22, floor beams 23, ceiling beams 24, etc., and each of these columns and beam members. Are made of refractory steel (FR steel). Naturally, each unit constituting the upper layer is collectively manufactured in a factory or the like, and the membrane method is adopted as the fireproofing means. Therefore, the pillar 22 of each unit 21 is surface-coated with the outer wall material 25 and the fireproof inner wall material 28. The floor beam 23 is provided with the floor material 26 of the ALC panel on the upper surface of the lower flange thereof, and the ceiling beam 24 is provided with the fireproof ceiling plate 27 below the floor beam 23. The columns 22, floor beams 23, and ceiling beams 24 of the unit are all surface-covered by the outer wall plate 25, the floor plate 26, and the ceiling plate 27 by vertically connecting the columns.

FIG. 4 shows a fireproof coating structure of a beam portion used in a unit structure of an upper floor in a combined building according to the present invention. In the figure, the large beam 24 and the small beam 29 located on the ceiling part are located above the ALC plate 26 which is the floor plate in the unit structure of the upper floor, and below the beams 24 and 29 are the lower floor parts. The fireproof ceiling plate 27 in the unit structure of FIG. Therefore, all the ceiling beams, which are part of the frame of the unit structure, are surface-covered by the ALC floor plate and the fireproof ceiling plate, which are fireproof plate materials. Since the frame members of each unit are made of fire-resistant steel material (FR steel material), the thickness of the ceiling fireproof plate can be considerably reduced.

In the embodiment, the floor plate 26, which is an ALC panel, has a thickness of 10 mm, and as the ceiling fireproof plate 27, for example, two 12.5 mm plaster boards are attached. In addition, as shown in FIG. 3, the outer wall structure of the unit is such that the pillar 22 made of refractory steel (FR steel) is an ALC panel 25 of 100 mm and a reinforced gypsum board containing glass fiber of 15 mm thickness.

FIG. 5 shows an example of a fireproof coating on the ceiling beam of the first floor in the combined building of the present invention. In this case, since the ceiling beams on the first floor are made of general steel,
The perimeter of the girder 13 is individually surrounded by a conventionally known refractory coating material 16. Further, although the ceiling fireproof plate 31 is provided, the ceiling beam 14 can also be individually provided with a fireproof coating as shown in FIG. The reference numeral 26 in the figure indicates a unit-structure floor panel corresponding to the second floor.

[0021]

[Effect] In the combination building in the present invention, the first floor portion has a steel frame structure using general steel material, and the fireproof coating is mainly the individual coating of the steel aggregate material, so the floor plan of the first floor portion, the ceiling height, etc. There is a degree of freedom in design, and sufficient fire protection measures can be adopted. Furthermore, by utilizing the characteristics of the unit structure on the upper floors, the fireproof coating process can be simplified and the construction period can be shortened, and the weight of the fireproof coating can be reduced by using fireproof steel as the steel aggregate. It is possible to solve the drawbacks due to the dimensional limitation of the unit structure. In addition, by reducing the weight of the upper floors of the combined building, it is possible to achieve a composite effect such as improved vibration resistance.

[0022]

[Brief description of drawings]

FIG. 1 is a schematic view of a three-story building in a combined building of a general steel structure and a unit structure according to the present invention.

FIG. 2 is a schematic view of a four-story combination building according to another embodiment of the combination building according to the present invention.

FIG. 3 is a schematic vertical cross-sectional view of the three-story combination building shown in FIG. 1.

FIG. 4 is a partial cross-sectional view showing a covering structure of a floor beam and a ceiling beam of a unit structure portion on an upper floor.

FIG. 5 is a partial cross-sectional view showing a covering structure of a ceiling beam portion made of a general steel material in a first floor portion.

[Explanation of symbols]

 10 First floor of combined building 12 First floor general steel pillar 13 First floor ceiling General steel girder 16 Fireproof coating for first floor ceiling beam 20 Upper floor unit structure 21 Unit structure 22 Fireproof steel column 23 Fireproof steel floor beam 24 Fireproof Steel Ceiling Beam 26 Floorboard ALC Panel 27 Unit Fireproof Ceiling Board 28 Unit Fireproof Wall Material

Claims (4)

[Claims] 1. A first floor portion of a structure in which a frame is composed of steel columns and beams made of ordinary steel, and each frame is individually or collectively fireproof coated, and a refractory steel (FR steel).
It is characterized in that it is a combination with the upper floor part of a structure in which a plurality of unit structures that are configured by covering the frameworks of columns, floor beams and ceiling beams with fireproof surface materials are connected vertically and horizontally. Combined fireproof building. 2. The combined building according to claim 1, wherein the skeleton of the unit structure has an outer wall portion and a floor surface portion covered with ALC panels and a ceiling portion covered with a thin fireproof panel. 3. The combined building according to claim 2, wherein the thin fireproof material panel of the ceiling part is formed by attaching two gypsum boards. 4. The first floor portion is constructed by assembling pillars and beams of ordinary steel at the construction site and fire-resistant coated, and then the columns and beams are assembled by fire-resistant steel material and surface coated with fire-resistant surface material in advance at the factory. A method of constructing a fire-resistant middle-rise building in which a unit structure is installed and only the fire-resistant coating of the joint is performed on-site.