JPH0978764A - Built-up reinforcement truss and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of buckling by forming a band-shaped steel plate into the wave-shape so as to form a waved steel plate lattice, and integrally welding each deformed reinforcement to this waved steel plate lattice at four positions of upper, lower, right and left. SOLUTION: A band-shaped steel plate 1 is bent at bending lines 1a, which are provided in the band-shaped steel plate 1, and formed into the waved-shape so as to form a waved steel plate lattice, and four deformed reinforcements 2 are welded to this waved steel plate lattice at four positions of upper, lower, right and left so as to form an erection reinforcement truss. This reinforcement truss is mainly used for the beam material and the floor material, and both ends of the reinforcement truss are provided on a large beam, and a framework is fitted to the reinforcement truss, and thereafter, concrete is placing. Even in the case where the lightweight material, not concrete, is combined with this reinforcement truss for use, generation of buckling can be easily prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled reinforcing bar truss used as a reinforcing bar for a reinforced concrete structure or a structural material for a floor, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A reinforcing bar truss is a truss-shaped structure in which an upper chord reinforcing bar a and a lower chord reinforcing bar b, which are composed of large diameter reinforcing bars, are tightly connected to a slender small diameter reinforcing bar c. )) Oblique diagonal bar (hereinafter referred to as the lattice bar) may be assembled three-dimensionally (see FIG. 8B), or may be assembled in a ladder shape. (See FIG. 8C) d in the figure
Is a caulking metal member that constitutes a member node of the truss.

Generally, the above-mentioned reinforcing bar truss is often used as a reinforcing material for a reinforced concrete floor or a beam. As a method of using the reinforcing bar truss, both ends of the reinforcing bar truss are installed on opposite beams, a frame is attached to the reinforcing bar truss and floor concrete is placed, and the load at the time of placing concrete is borne by the reinforcing bar truss. However, after hardening the concrete, it will resist external forces as a reinforced concrete floor.

Alternatively, only the lower chord streak is embedded in the concrete plate, and a semi-finished precast concrete plate with a part of the lattice streak and the upper chord streak exposed is installed on the beam, and then the concrete on the upper surface of the plate is poured. The synthetic floorboard construction method is used. When the reinforcing bar truss is used as a bending material, the lower chord bar is a tension material and the upper chord bar is a compression material, and the bending strength increases as the truss size increases.

However, the lattice reinforcement is a small-diameter reinforcement, and the reinforcement lattice cannot buckle sufficiently because the lattice material buckles early. For this reason, it has been often used as a reinforced concrete which is used in combination with a material having high rigidity such as concrete to prevent the buckling of the lattice material and to expect the tensile strength of the concrete on the compression side of the bending material.

Further, a machine for automatically forming assembled rebars has been developed, but in the case of automatic forming, there are many methods of spot welding the intersections of the upper and lower chord members and the lattice material. In this case, there is a restriction on the diameter of the reinforcing bar. Yes, there was a limit to the size of the assembled rebar. Further, in the case of a large-sized reinforcing bar truss, a deformed reinforcing bar is often used for the chord material, and automatic welding is difficult to weld at the intersection with the lattice reinforcing bar, so it was manufactured by hand.

[0007]

In the conventional reinforcing bar truss, it is common to use large-diameter reinforcing bars for the chord members and small-diameter reinforcing bars for the lattice reinforcement, and to assemble them in combination with concrete. The larger the assembled rebar truss is, the greater the bending resistance becomes.However, since the conventional rebar truss is a rebar with a small diameter lattice, the buckling direction is not constant and it is combined with a highly rigid material such as concrete. Was used to prevent buckling. In this way, concrete must have high rigidity in order to exhibit the function of preventing buckling of lattice muscles, and it is not possible to demonstrate sufficient performance with the combination of super lightweight concrete such as foamed lightweight concrete and rebar truss. It was

The present invention has been proposed in view of the problems of the above-mentioned prior art, and its object is to have a yield strength equal to or higher than that of a conventional reinforcing bar truss in terms of performance and to use a lattice material of The point is to provide an assembled reinforcing bar truss that prevents buckling and can easily prevent buckling even when used in combination with a lightweight material other than concrete.

[0009]

In order to achieve the above-mentioned object, an assembled rebar truss according to the present invention is provided at four positions on the upper and lower sides and right and left sides of a corrugated steel sheet lattice formed by corrugating a strip steel sheet. It is configured by integrally binding deformed reinforcing bars extending in the longitudinal direction of the truss. The invention of claim 2 is configured by tightly connecting a buckling prevention horizontal rebar of a steel plate lattice member extending in the longitudinal direction of the truss to the steel plate lattice member at the middle portion in the height direction of the assembled reinforcing bar truss.

According to the method of manufacturing an assembled truss according to the third aspect of the present invention, V-shaped cuts are made at predetermined positions on both outer edges along the longitudinal direction of the strip steel plate, and both side edges of the strip steel plate are V-shaped. After bending by a width cut in a letter shape to provide ribs, the strip steel plate with ribs is bent into a corrugated shape, and then deformed rebars are tightly connected to the upper, lower, left and right parts of the bent steel plate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show a preferred embodiment of the present invention, and a strip steel plate 1 having a required width shown in FIG.
After being bent into a corrugated shape as shown in FIG. 1 (b) through a bending line 1a indicated by a dotted line, the corrugated steel sheet 1 is placed at four positions above and below and to the left and right of this corrugated strip steel sheet as shown in FIG. 1 (c). Four deformed rebars 2 extending in parallel with are attached to form an assembled rebar truss. The bent horizontal portion of the corrugated steel sheet 1 and the deformed rebar 2 are tightly connected by welding w. (Refer to FIG. 2) When a steel plate is used as the lattice member, the buckling direction is the weak axis direction. , 2'is provided and the buckling strength is also improved by reinforcing only this direction.

As shown in FIGS. 4 and 5, the chord members may be attached to the upper and lower sides of the lattice member or to the left and right sides of the lattice member. . FIG. 6 shows another embodiment of the present invention, in which V-shaped cut portions 3 are cut out at predetermined positions on both side edges in the longitudinal direction of a strip steel plate 1 having a predetermined width (see FIG. 6A). Each V
Band steel plate 1 that connects between the notches 3a of the back of the notch
Bend substantially perpendicularly along a fold line 4 parallel to both side edges of the V-shaped cut portion 3 and a fold line 4'orthogonal to the strip steel plate 1 connecting between the cut end portions 3a of the V-shaped cut portions 3 facing each other (see FIG. )) The four deformed rebars 2 forming the upper chord bar 2a and the lower chord bar 2b are attached by welding to the upper and lower sides and the left and right sides of the steel plate lattice with the ribs 5 thus formed, to form an assembled truss. (Refer to FIG. 6 (c)) As shown in FIG. 5 (a) and FIG. 6 (b), the chord members may be attached on the top and bottom of the lattice material or on the left and right sides. No, select according to the application.

The reinforcing bar truss is most preferably used for a beam or floor, and both ends of the reinforcing bar truss are installed on a large beam, a form is attached to the reinforcing bar truss, and concrete is poured. As shown in FIG. 7, the reinforcing bar truss may be surrounded by the refractory board 6, and the lightweight foam material 7 may be filled to fabricate the composite floorboard in advance and install it on the beam. In this case, the hard foam resin serves to prevent buckling of the steel plate lattice, and a lightweight floor slab with high strength and rigidity is configured, and it is not necessary to provide ribs on the steel plate lattice, and the width of the lattice material is wide, Buckling can be sufficiently prevented even with foamed resin.

[0014]

As described above, the assembled reinforcing bar truss according to the present invention uses the strip steel sheet as the lattice material and is formed by corrugating the strip steel sheet in a corrugated manner, so that the flat portions are formed at equal intervals,
The truss itself becomes a self-supporting shape, and the assembled truss itself becomes a self-supporting shape, thus improving workability. Further, since the bent strip steel plates constituting the lattice member are formed at substantially equal intervals, it is easy and easy to attach a hanging hook such as equipment or a ceiling member to this portion.

Further, the assembled reinforcing bar truss of the present invention is mainly used as a beam material and a floor material. When the beam or floor is attached, the shape of the lattice can be selected according to the construction method, and the application range is wide. Become According to the invention of claim 2, the buckling prevention lateral bar of the steel plate lattice member extending in the longitudinal direction of the truss plate is tightly connected to the steel plate lattice member at the middle portion in the height direction of the assembled truss truss to thereby cause the buckling of the assembled reinforcing bar truss of the present invention. The strength is further improved, and the yield strength and rigidity are further improved.

According to the third aspect of the present invention, both outer edges of the strip steel plate along the longitudinal direction are cut into V shapes at predetermined intervals, and both side edges of the steel plate are bent by the V-shaped width. The ribs are attached to the lattice members of the assembled reinforcing bar truss by attaching ribs and then bending the ribbed strip steel plate in a corrugated shape, and then connecting deformed rebars to the upper, lower, left and right four places of the bent steel plate. Thus, the strength and rigidity of the lattice material are increased, and the proof stress of the reinforcing bar truss is significantly improved.

[Brief description of drawings]

1 (a), (b) and (c) are explanatory views showing a manufacturing process of an assembled reinforcing bar truss according to the present invention.

FIG. 2 is a perspective view of an assembled rebar truss manufactured by the method shown in FIG.

FIG. 3 is a perspective view showing a state in which an assembled rebar truss according to the present invention is reinforced.

4A and 4B are a front view and a side view showing an embodiment of a chord member attached to a corrugated steel plate lattice.

5A and 5B are a front view and a side view showing another embodiment of a chord member and a mounting state with respect to a corrugated steel plate lattice.

6A, 6B, 6C, 6D, 6E, 6F, 6G, 6H, 6H, 6I, 6I, and 9I are explanatory views showing a manufacturing process of a reinforcing bar truss having a lattice with ribs according to the present invention.

FIG. 7 is a vertical sectional view showing an example of use of the assembled reinforcing bar truss according to the present invention.

8A, 8B and 8C are perspective views showing a conventional example of a reinforcing bar truss.

[Explanation of symbols]

 1 band steel plate 1a bending line 2 deformed bar 2a upper chord line 2b lower chord line 3 V-shaped cut section 3a V-shaped cut section depth tip 4 bending line 4'folding line 5 rib 6 fireproof board 7 lightweight foam material

 ─────────────────────────────────────────────────── ─── Continued front page (72) Keiro Adachi 1-10-12 Nihonbashi Horidome-cho, Chuo-ku, Tokyo Inside Chuo Built Industrial Co., Ltd. (72) Inventor Koso Kitano 1-chome, Nihombashi-Horidome-cho, Chuo-ku, Tokyo No. 10-12 Inside Chuo Built Industry Co., Ltd.

Claims (3)

[Claims] 1. An assembled rebar, characterized in that deformed rebars extending in the longitudinal direction of a truss are integrally bonded at four positions on the upper, lower, left and right sides of a corrugated steel plate lattice formed by corrugating a strip steel plate. truss. 2. The assembled reinforcing bar truss according to claim 1, wherein buckling prevention transverse reinforcing bars of the steel plate lattice material extending in the longitudinal direction of the truss are tightly bonded to the steel plate lattice material at the middle portion in the height direction of the assembled reinforcing bar truss. 3. A strip is cut into a V shape at predetermined positions on both outer edges of the strip along the longitudinal direction, and both side edges of the strip are bent by a width cut into a V shape to form ribs. A method for manufacturing an assembled reinforcing bar truss, which comprises bending the ribbed strip steel plate into a corrugated shape, and then fastening deformed rebars at four positions on the upper, lower, left and right sides of the folded steel plate.