JP3769714B2 - Construction method of floor slab unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a deck unit, about the construction method of deck units especially corresponding to the large span in the unnecessary girder.
[0002]
[Prior art]
In recent years, the desire to reduce the floor height while securing the ceiling height of a building has been increasing in the course of pursuing lower construction costs.
The purpose of floor height reduction is to reduce structural materials, finishing materials and construction costs associated with the decrease in the area of outer and inner walls, and to increase the total floor area by increasing the number of floors in office buildings and other areas where height is limited. This is to increase the rental area of the office by increasing the floor area that can be rented as an office.
[0003]
In order to reduce the floor height, the structural frame construction method is used in order to make the best use of the legally constructable space that is limited by height restrictions and diagonal restrictions while ensuring the performance of the living space. When reviewing, the major factor that determines the floor height is the beam formation of the living space part, especially in the office building, eliminating the large beam of the office part and dealing with the large span only by the slab. .
As a method of constructing a floor slab that does not require a large beam and can handle a large span, various types of structures have been proposed, but a typical example is a hollow that continues horizontally in the center in the thickness direction of the slab. There are hollow void slabs that make up the space, and precast concrete slabs with prestress introduced inside the slabs.
However, these structural types are reinforced concrete structures that are heavy when they have large span floors with spans exceeding 12m and reaching 14m, as is the case with most common office buildings. Therefore, the stress due to the weight of the floor slab itself becomes excessive, and the floor slab thickness becomes excessive, which presents a problem that cannot be realistically dealt with.
[0004]
[Problems to be solved by the invention]
In view of the above problems, the present invention is intended to solve the problem, and in order to achieve a reduction in floor height and realize a reduction in construction costs and an increase in floor area, it is lightweight and can handle a large span, and We provide a method for constructing floor slab units with excellent heat insulation and sound insulation.
[0005]
[Means for Solving the Problems]
The method for constructing a floor slab unit according to the present invention forms a steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at one end of the flat plate portion which are substantially orthogonal to the flat plate portion and are continuously spaced at a predetermined interval. Then, the flat plate portion of the steel plate is disposed below and the foam is filled in the space surrounded by the flat plate portion and the rising portion. Since the fireproof coating is provided on the flat plate part of the steel plate afterwards, it can be used for large-span floor slabs, and it is lightweight and breaks the fireproof coating without any special treatment on the floor slab unit. It is possible to build a floor slab unit that does not let you .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A floor slab unit according to the present invention includes a steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at a front end substantially perpendicular to the flat plate portion and having a predetermined interval on one surface of the flat plate portion, and a flat plate of the steel plate And a fireproof covering material fixed to a flat plate portion opposite to the rising portion forming surface of the steel sheet, and filled in a space surrounded by the portion and the rising portion. Will be described with reference to the drawings.
[0009]
FIG. 1 is a sectional view of a floor slab unit according to the present invention.
The floor slab unit 1 is formed by continuously bending a single steel plate 2 having a thickness of, for example, 1.0 mm to 2.3 mm, and has a height of 350 mm formed at an interval of 400 mm from the flat plate portion 3. The plurality of rising portions 4 are the main structural members 5 of the steel plate 4.
In the present embodiment, the total width of the floor slab unit 1 is 1,600 mm, and the rising portions 4 are provided at a total of five locations including the rising portions 4 on the side portions.
Since the middle rising portion 4 of the floor slab unit 1 is formed by continuously bending a single steel plate 2, the steel plate 2 has a double structure, and the strength is further increased. .
Further, the tip portion is formed in an inverted triangle shape, and the key portion dent portion 7 is formed as a coupling portion on the plane portion 6, so that it acts to increase adhesion to the cast-in-place concrete described later. ing.
The floor slab unit 1 may be provided with a swell in the span direction to cope with the deflection caused by the concrete placement when the floor slab is constructed.
[0010]
Between the flat portions 6 of the plurality of rising portions 4, a plurality of flat bars 8 having a thickness of 3 mm and a width of 32 mm are attached at intervals of 400 mm so as to be orthogonal to the length direction of the rising portions 4. Has contributed.
The space formed by the flat plate portion 3 and the rising portion 4 is filled with foamed urethane 9. The urethane foam 9 prevents buckling in the out-of-plane direction of the rising portion 4 and is effective in improving heat insulation and sound insulation.
[0011]
The surface of the flat plate portion 3 on which the rising portion 4 is not formed is embossed, and is provided in contact with this surface, and a lightweight concrete 10 having a thickness of 75 mm with a wire mesh serving as a fireproof covering material for the steel plate 2; The adhesion of is increased. Notches 11 are formed at both ends of the lightweight concrete 10 in the longitudinal direction. When the floor slab units 1 are arranged in parallel, the connecting portions are fireproofed, and only the fireproof seal is applied to the notches 11. I can do it. As the fireproof covering material, other commonly used materials such as a calcium silicate plate can be used.
In addition, on the upper surface of the urethane foam 9 of the main structural member 5, a cast-in-place concrete 12 having a thickness of 100 mm is placed later as illustrated.
[0012]
FIG. 2 is a cross-sectional view showing various embodiments of the rising portion.
The shape of the rising portion 4 shown in FIG. 2 (a) is an F-shaped one that does not have a superposed portion of the steel plate when the steel plate 2 is bent, and the shape shown in FIG. 2 (b) is a superposed portion at the time of bending. And the tip portion is an I-shape formed in a flat plate shape, and the one shown in (c) is an L-shaped one in which the flat plate is formed only on one side of the rising portion 4. Adopted.
Further, in place of the dent 7 formed on the flat portion 6 at the tip of the rising portion 4, even if embossing is performed or a stud is placed, adhesion between the flat portion 6 and the cast-in-place concrete 12 can be secured. .
Furthermore, instead of the flat bar 8 that holds the position of the rising portion 4, a wire mesh, a welded reinforcing bar or a reinforcing bar may be used. In addition, if embossing is performed on the surface of the flat bar 8, More adhesion can be expected.
[0013]
The cross-sectional view shown in FIG. 3 illustrates another embodiment of the main structural member. The main structural member 5 shown in FIG. 3A uses a single flat steel plate as the flat plate portion 3, and is thicker than the flat plate portion 3 that is formed separately from the flat plate portion 3 and has a substantially C shape. The plurality of rising portions 4 are formed by being fixed to the flat plate portion 3 by spot welding or the like at a predetermined interval.
In this case, the main structural member 5 can be easily manufactured without using a large-scale bending machine.
[0014]
The main structural member 5 shown in FIG. 3 (b) is a view showing still another embodiment, in which the rising portion 4 is formed by superposing steel plates by bending or drawing, etc. This is different from the embodiment.
In addition, a striped steel plate or an expanded metal is used instead of the flat steel plate used separately from the rising portion 4. When expanded metal is used, the adhesion strength with the in-situ concrete 12 is higher.
Then, the processing for improving the adhesion to the flat surface portion 6 provided at the tip portion of the rising portion 4 is the same as in the first embodiment. Needless to say, the dimensions, intervals, materials, etc. of the respective members are appropriately set according to the required proof stress, and are not limited to the present embodiment.
[0015]
Next, the construction method of the floor slab unit 1 will be described with reference to FIG.
The method for constructing a floor slab unit according to the present invention forms a steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at one end of the flat plate portion which are substantially orthogonal to the flat plate portion and are continuously spaced at a predetermined interval. Then, the flat plate portion of the steel plate is disposed below and the foam is filled in the space surrounded by the flat plate portion and the rising portion. It supports and arrange | positions, and after that, a fireproof coating material is provided in the flat plate part of a steel plate.
Therefore, in the construction of the floor slab unit 1, first, the main structural member 5 composed of the flat plate portion 3 and the rising portion 4 is formed on the steel plate 2. Furthermore, the floor slab unit 1 has a length of 14 m, a flat bar 8 is attached to the flat surface portion 6 of the rising portion 4, and a urethane foam 9 is filled into a space formed by the flat plate portion 3 and the rising portion 4.
After the foaming urethane 9 is cured, the floor slab 1 is placed on the rising portion 4 located substantially in the center in the length direction of the floor slab unit 1 with the flat plate portion 3 on which the rising portion 4 is not formed facing upward. Two points are supported on the formed flat portion 6.
[0016]
Next, a lightweight concrete 10 having a thickness of 75 mm containing a wire mesh is placed on the flat plate portion 3 while applying a predetermined additional load P to the protruding tip 13 on both sides of the supported floor slab unit 1. Thus, a fireproof coating is applied to the flat plate portion 3 of the steel plate.
When the lightweight concrete 10 is placed, the stress due to the weight of the lightweight concrete 10 applied to the floor slab unit 1 in a state where two points are supported at the center of the rising portion 4, with the lightweight concrete 10 on the lower side, as described later, In the state in which the floor slab unit 1 is supported at the two points of both ends 13, the light weight concrete 10 balances with the stress due to its own weight, so that no stress is generated in the light weight concrete of the floor slab unit 10 and no cracks occur.
Further, in the floor slab unit 1 in a state where the two points 13 on both ends 13 of the floor slab unit 1 are supported, the load P applied to the protruding tip 13 on both sides when the lightweight concrete 10 is placed is introduced as prestress. Therefore, it works effectively when a new load is applied to the floor slab unit 1.
[0017]
FIG. 5 is a drawing for explaining a method for constructing a floor slab using a floor slab unit.
The floor slab construction method according to the present invention is such that the above-mentioned floor slab unit is arranged between the beams and the columns with the fireproof covering facing downward, and the concrete is placed in contact with the rising portion having the connecting portion at the tip and the foam. However, FIG. 5A is a longitudinal sectional view of the floor slab unit constructed according to the present invention, and FIG. 5B is a longitudinal sectional view of the floor slab unit.
The floor slab unit 1 is fixed to a structural member such as a beam or a column by a commonly used method with the lightweight 10 facing down and the foam 9 surface facing up.
In this embodiment, the floor slab unit 1 and the beam are fixed to the web 16 in a large beam 15 made of a steel frame having a stud 14 on the upper flange surface, as shown in FIGS. 5 (a) and 5 (b). A receiving plate 18 having a rib 17 at the bottom is fixed, and the floor slab unit 1 is placed thereon.
[0018]
As described above, in the floor slab construction method using the floor slab unit according to the present invention, a plurality of floor slab units 1 are abutted and arranged in parallel, and then mesh streaks or reinforcing bars (not shown) are formed on the upper surface of the urethane foam 9. .) Is placed and then the cast-in-place concrete 12 is cast to form the floor slab structure 19 in which the floor slab unit 1 is integrated with each other. Therefore, the floor slab structure 19 has in-plane shearing force and in-plane rigidity. As a result, the rigid floor condition is satisfied, and the out-of-plane rigidity of the floor slab unit 1 in the direction perpendicular to the span is improved, so that the floor vibration can be reduced.
[0019]
Since the finish of the cast-in-place concrete 12 is similar to that of a normal RC floor slab, the floor slab structure 19 does not cause unevenness of the floor even when a plurality of floor slab units 1 are used.
Even if water drops on the floor slab structure 19, the floor surface is integrated with the cast-in-place concrete 12, so water leakage to the lower floor does not occur.
Furthermore, even if a problem occurs in the lightweight concrete 10 which is the fireproof covering material of the floor slab unit 1 and the main structural material 5 is affected, the shear weight of the in-situ concrete 12 alone can bear the weight of the floor slab structure 19. Therefore, the floor slab structure 19 does not collapse or fall, and sufficient safety against fire is ensured.
[0020]
【The invention's effect】
A floor slab unit according to the present invention includes a steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at a front end substantially perpendicular to the flat plate portion and having a predetermined interval on one surface of the flat plate portion, and a flat plate of the steel plate A foam filled in a space surrounded by a portion and a rising portion, and a fireproof covering material fixed to a flat plate portion opposite to the rising portion forming surface of the steel plate, specifically, The flat part and the rising part are bent from one steel plate, so it is lightweight, can be used for large-span floor slabs, and exhibits excellent heat insulation and sound insulation.
[0021]
The method for constructing a floor slab unit according to the present invention forms a steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at one end of the flat plate portion that are substantially orthogonal to the flat plate portion and are continuous at a predetermined interval. Then, the flat plate portion of the steel plate is disposed below and the foam is filled in the space surrounded by the flat plate portion and the rising portion. Since the fireproof coating is provided on the flat plate part of the steel plate afterwards, it can be used for large-span floor slabs, and it is lightweight and breaks the fireproof coating without any special treatment on the floor slab unit. There is an effect that can build a floor slab unit that can not be made.
[0022]
In the floor slab construction method according to the present invention, the floor slab unit is disposed between the beams and the columns with the fireproof covering facing downward, and the concrete is placed in contact with the rising portion having a connecting portion at the tip and the foam. It can also handle large span slabs, requires no support during construction, and the floor slabs after construction have the same smoothness as ordinary RC floors, and the in-plane rigidity of the floor is also increased. The effect is that a floor slab with less vibration can be constructed.
[Brief description of the drawings]
FIG. 1 is a sectional view of a floor slab unit according to the present invention. FIG. 2 is a sectional view of another rising portion of the floor slab unit. FIG. 3 is a sectional view of another main structure of the floor slab unit. FIG. 5 is a diagram showing a construction method of a floor slab unit according to the present invention. FIG. 5 is a sectional view of a floor slab constructed by the construction method of the present invention.
1: floor slab unit 2: steel plate 3: flat plate part 4: rising part 5: main structural member 6: flat part 7: dent part (joining part) 8: flat bar 9: urethane foam 10: lightweight concrete (fireproof coating material)
11: notched portion 12: cast-in-place concrete 13: tip 14: stud 15: large beam 16: web 17: rib 18: receiving plate 19: floor slab structure

Claims (1)

A steel plate comprising a flat plate portion and a plurality of rising portions having a connecting portion at a leading end substantially perpendicular to the flat plate portion at a predetermined interval is formed on one surface of the flat plate portion, and the flat plate portion of the steel plate is disposed below Then, the foam is filled into the space surrounded by the flat plate portion and the rising portion, and after the foam is cured, the flat plate portion of the steel sheet is placed upward to support the rising portion at the substantially central portion, and then the steel plate Of building a floor slab unit in which a refractory coating material is provided on the flat plate portion .

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