JPH0932175A - Construction method of composite floor slab of reinforced truss and concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a rigid floor slab which can be used as structural members, by combining thin steel plates on a reinforced truss with floor slab concrete as a unit. SOLUTION: A plurality of reinforced trusses 10, 10 are laid between girders 1, 1 with a specified distance and thin steel plates 2 having uneven protrusions in the direction crossing at right angles against the reinforced truss 10 are laid thereon. Connection metal fittings 3 are arranged at three or more positions on the upper face of thin steel plates 2 right above the upper chord side lattice nodes 16 and with the longitudinal distance of the reinforced truss 10 to come into contact with the floor slab reinforcements 4. Then, cast-in-place concrete is placed by using the thin steel plates 2 as forms to construct a floor slab 6. Since the connection metal fittings 3 serve as shear connectors, the floor slab joins the thin steel plates 2 on the reinforced truss 10 to the floor slab concrete as a unit and hence, the floor slab retaining a cumulative strength can be constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor slab construction method in which thin iron plates are laid side by side on permanent reinforced trusses installed between girders. The present invention relates to a construction method of integrating slabs to construct a floor slab having high rigidity.

[0002]

2. Description of the Related Art The inventor of the present invention has disclosed in Japanese Patent Nos. 714364, 773646, 823938, etc., as a floor slab construction method for steel frame construction, without a beam, even if it has a large span, and does not support or form. Invented a floor slab method that does not require removal work. In these inventions, a plurality of reinforcing bar trusses are hung at a predetermined interval between girders, and a width stop bar for lateral buckling prevention is fixed between the upper chord members or lower chord members of adjacent reinforcing bar trusses, and the reinforcing bar trusses are placed on the reinforcing bar trusses. It consists of laying a thin iron plate and providing floor slab reinforcement, and then pouring in-place concrete using the thin iron plate as a formwork, eliminating the need for ordinary support and formwork, enabling simultaneous construction on each floor. The work period can be shortened.

[0003]

In each of the above inventions, the construction period can be shortened, but since the wooden and plastic pillows are simply arranged on the thin iron plate at appropriate intervals, the reinforcing bar truss is required. There was a difficulty in the integration of the above thin iron plate and the floor slab concrete, and the strength of the structure, particularly the heavy load floor structure, was sometimes lacking. An object of the present invention is to construct a floor slab that is rigid enough to be used as a structural member by maintaining the cumulative strength by integrating the thin iron plate on the reinforced truss and the floor slab concrete.

[0004]

In order to achieve the above object, the method for constructing a composite floor slab according to claim 1 of the present invention is to install a plurality of main reinforcing bar trusses at a predetermined interval between girders;
Thin iron plates are laid on the reinforcing bar trusses, and connecting metal parts to be integrated with concrete are fixed to appropriate places on the upper surface of the thin iron plates directly above the upper chord members of the reinforcing bar truss; After that, it consists of pouring concrete using a thin iron plate as a formwork. According to a second aspect of the present invention, a plurality of permanent reinforcing bar trusses each having an angle section, a T section, a narrow flat plate or two round steel rods as an upper chord member are hung at a predetermined interval between the girders; Laying an uneven thin iron plate in the direction orthogonal to the reinforcing bar truss on top; then, pre-attaching or retrofitting connecting hardware at appropriate places near both ends and the center of the reinforcing bar truss on the upper surface of the thin iron plate immediately above the lattice node on the upper chord member side After the connection metal fittings are fixed to the floor slab arrangement, concrete is placed using a thin iron plate as a formwork.

According to a third aspect of the present invention, a plurality of main reinforcing bar trusses are hung at predetermined intervals between the girders, and a thin iron plate is laid on the reinforcing bar truss; an upper surface of the thin iron plate which is directly above the upper chord member of the reinforcing bar truss. Then, the connecting metal fittings that can be integrated with the concrete are fixed at appropriate places spaced apart in the longitudinal direction of the reinforcing bar truss; after fixing the connecting metal fittings to the floor slab arrangement, concrete is placed using the thin iron plate as the formwork. While constructing a floor slab, a hanging tree is provided on the lower chord member of the reinforcing bar truss to extend a rust-proof and fireproof ceiling. As the connection hardware, stud bolts, reinforced shear connectors, and other hardware that integrates the reinforced truss and concrete are used.

[0006] A plurality of main reinforcing bar trusses, which are maintained at a predetermined interval between the girders, are laid, a thin iron plate having irregularities is laid on the trusses, and a connecting metal object such as a stud bolt is fixed at a predetermined position to dispose the floor slab. After making contact with the streaks, a cast iron concrete is cast using a thin iron plate as a formwork to construct a floor slab. When an angled bar, T-shaped bar, or narrow flat plate is used as the upper chord bar, when the reinforcing bar truss is hung, several points are placed in the longitudinal direction of the reinforcing bar truss on the upper surface of the thin iron plate directly above the upper chord bar. Secure the connecting hardware to. When using a reinforced truss made of two round steel bars arranged in the upper chord, an uneven thin iron plate is laid in the direction orthogonal to the reinforced truss. Next, the connecting hardware is fixed to the upper surface of the thin iron plate that is immediately above the lattice node on the upper chord side, but it is not necessary to place it on all the lattice nodes on the upper chord side. Secure it at three or more locations directly above the lattice node on the upper chord side. Since the connecting hardware is an element of the shear connector, it is possible to construct a synthetic floor slab that maintains the cumulative strength by achieving the integrity of the thin iron plate on the reinforced truss and the slab concrete.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be specifically described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of one embodiment of the present invention, and FIG. 2 is a vertical side view. As shown in the figure, a width stop bar 15 is provided between the girders 1 and 1 at predetermined intervals (for example, 6).
A plurality of permanent reinforcing bar trusses that hold 0 cm pitch)
0, 10 are laid, a thin iron plate 2 having irregularities such as a small wave galvanized plate and corrugated plate is laid on it, and connecting hardware 3, 3 such as a stud bolt is arranged at a predetermined position and the floor slab arrangement 4
After that, the cast iron 5 is cast using the thin iron plate 2 as a frame to construct the floor slab 6.

The reinforcing bar truss 10 is a truss beam in which a lattice 13 is fixed between upper chord members 11 and 11 in which two angle-shaped members face each other and a lower chord member 12 made of one round steel rod.
The plates 14 and 14 at both ends are hung on the girder (FIG. 2). When an angled bar, T-shaped bar, or narrow flat plate is used as the upper chord bar, when the reinforcing bar truss is hung, several points are placed in the longitudinal direction of the reinforcing bar truss on the upper surface of the thin iron plate directly above the upper chord bar. Secure the connecting hardware to. In the case of using a reinforcing bar truss having two round steel bars arranged in an upper chord (not shown), a thin iron plate having irregularities is laid in a direction orthogonal to the reinforcing bar truss. Next, the connecting hardware is fixed to the upper surface of the thin iron plate that is immediately above the lattice node on the upper chord side, but it is not necessary to place it on all the lattice nodes on the upper chord side. Secure it at three or more locations directly above the lattice node on the upper chord side.

The connecting hardware 3 is arranged on the upper surface of the thin iron plate 2 which is directly above the upper chord member side lattice node 16 of the reinforcing bar truss 10. However, it is not necessary to place it on all the lattice nodes on the upper chord member side, and the reinforcing bar truss of normal span 10
At an appropriate interval, for example, it is arranged immediately above the upper chord member side lattice node 16 at three or more locations including both ends and the center of the reinforcing bar truss (FIG. 2). Since the connection hardware 3 serves as an element of the shear connector, the thin slab 2 on the reinforcing bar truss and the slab concrete 5 can be integrated with each other to construct a synthetic floor slab that retains cumulative strength.

FIG. 4 is a vertical sectional side view of the second embodiment.
As described above, after the upper surface of the connecting hardware 3 is brought into contact with the floor slab arrangement 4, concrete 5 is placed using the thin iron plate 2 as a form to construct the floor slab 6 that can be used as a structural member.
On the lower chord member 12 of the reinforcing bar truss 2, a hanging tree 7 is used to stretch a ceiling 8 which is rustproof and fireproof (a fireproof material is stretched).

[0011]

EXAMPLE FIG. 5 is a diagram showing the relationship between the load and the center displacement of the floor slab (RC, truss test body). In Fig. 5, the solid lines of the two thick and thin types are the concrete slab test pieces (slab thickness 15 cm) made by the conventional construction method in which the formwork is supported by the support, and the loading load is 6 to 7 P / 2 (tonf). Shows a maximum center displacement of 40 to 68 mm. On the other hand, the floor slab test piece of the present invention has a loading load of 4.
The maximum center displacement is 10 to 20 mm when 2 P / 2 (tonf), and the maximum center displacement is 13 to 18 mm when the loading load is 6 to 7 P / 2 (tonf) when the slab thickness of the chain line is 15 cm.
Is only shown.

Since the thin iron plate 2 has a large strength in the surface direction of the mold plate, it is possible to form a floor slab by preventing swelling during hardening of concrete without providing any special supporting work. In the illustrated example, the small wave zinc-plated thin iron plates 2 are laid side by side so that the uneven direction is orthogonal to the reinforcing bar truss 10, but the thin iron plate 2 may be arranged so that the uneven direction and the reinforcing bar truss 10 are parallel to each other (illustration). Omitted). The thin iron plate 2 is, for example, a plate having a thickness of 0.4 to 1.2 mm, a wave height of 25 to 50 mm, and a plate width of 650 to 700 mm, but the thin iron plate is not limited to the waveform as shown in the figure. It is also possible to use a mountain-shaped or trapezoidal-shaped keystone plate, an eye deck in which flat grooves are formed with fixed grooves at regular intervals, and a flat deck type in which inverted mountain grooves are formed.

[0013]

As described above, according to the present invention, the uneven thin iron plates are laid on the main reinforcement trusses that are passed between the girders, and then they are directly above the upper chord member side lattice node of the reinforcement truss. It consists of placing connecting hardware such as stud bolts on the upper surface of the thin iron plate and at several places in the span direction of the reinforcing bar truss, making it contact the floor slab reinforcement, and then placing concrete using the thin iron plate as the formwork. Therefore, normal support and formwork are not required, and the construction period can be shortened by enabling simultaneous construction on each floor.Because the connecting hardware becomes an element of the shear connector, the thin iron plate on the reinforced truss and floor slab concrete It is possible to construct a floor slab having a high rigidity that can be used as a structural member by achieving the integrity and maintaining the cumulative strength. In addition, after the connecting hardware is brought into contact with the floor slab reinforcement, in-situ concrete is cast using a thin iron plate as a form to create a floor slab that can be used as a structural member, while it is hung on the lower chord of the reinforcing bar truss. In the case of using a tree to extend a rust-proof and fireproof treatment or fireproof material-clad ceiling, it is possible to easily perform fireproof interior finishing of the room including the ceiling.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view taken along the line AA of FIG.

3 is a cross-sectional view of FIG.

FIG. 4 is a vertical sectional side view of a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a loading load and a center displacement of the floor slab according to the present invention.

[Explanation of symbols]

 1 Large Beam 2 Thin Iron Plate 3 Connection Hardware (Stud Bolt) 4 Floor Slab Reinforcement 5 Cast Concrete 6 Floor Slab 7 Hanging Tree 8 Ceiling 10 Reinforced Truss 11 Upper Chord Member 12 Lower Chord Member 13 Lattice 14 Plate 16 Lattice Node

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hisao Tomonaga 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takeshi Sano 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Saburo Koseki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yoshikuni Arai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. ( 72) Inventor Yoshiro Watanabe 3-5-8 Higashigotanda, Shinagawa-ku, Tokyo

Claims (4)

[Claims] 1. A plurality of main reinforcing bar trusses are hung between the girders at a predetermined interval, a thin iron plate is laid on the main reinforcing bar truss, and the upper surface of the thin iron plate which is directly above the upper chord member of the main reinforcing bar truss. A construction method of a composite floor slab that consists of placing concrete after connecting metal fittings that can be integrated with concrete. 2. A plurality of main reinforcing bar trusses each having an angle section, a T section, a narrow flat plate or two round steel bars arranged as an upper chord member at a predetermined interval between the girders. Laying an uneven thin iron plate in the direction orthogonal to the reinforcing bar truss, and then connecting it to concrete at appropriate places near both ends and the center of the reinforcing bar truss on the upper surface of the thin iron plate directly above the lattice node on the upper chord member side. A method of constructing a composite floor slab, in which the metal fixtures are fixed in advance or afterwards, the connecting hardware is fixed to the floor slab reinforcement, and then concrete is placed using a thin iron plate as a formwork. 3. A plurality of main reinforcing bar trusses are laid at predetermined intervals between girders, a thin iron plate is laid on the reinforcing bar truss, and the reinforcing bar truss is on the upper surface of the thin steel plate directly above the upper chords of the reinforcing bar truss. A connection metal fitting that can be integrated with concrete is fixed to appropriate places at intervals in the longitudinal direction of the truss, the connection metal fitting is fixed to the floor slab reinforcement, and then concrete is placed using a thin iron plate as a formwork to make the floor slab. On the other hand, a method of constructing a synthetic floor slab, which comprises hanging a lumber on a lower chord member of the reinforcing bar truss to stretch a rust-proof and fireproof ceiling. 4. The synthetic floor slab construction method according to claim 1, wherein the connecting hardware is a hardware such as a stud bolt or a reinforcing bar shear connector that is used to measure the integrity of the reinforcing bar truss and the concrete.