JP2005163508A - Reinforcing method for beam reinforcement of reinforced concrete construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide reinforced concrete construction strong against an earthquake or the like by enhancing beam strength in the beam of reinforced concrete construction. <P>SOLUTION: In this reinforcing method of a beam reinforcement of reinforced concrete construction, a web plate 2 connecting upper and lower beam main reinforcements is put in a beam center part to which bending moment load is greatly applied in the beam of reinforced concrete construction. The upper and lower beam main reinforcements are thereby made flange plates, and the structure of the beam reinforcement is formed in H-shape with three faces integrated like H-shape steel to reinforce the strength of concrete with the web plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a reinforcing method for a reinforced concrete beam. (Hereafter, reinforced concrete structure is referred to as RC structure)

Conventionally, in the RC beam method, the upper and lower main bars have been concreted in a state where they are temporarily fixed to the stirrup bars with binding wires. Assuming that the upper and lower main bars are flange plates as a problem, it is concrete that corresponds to the web plate, and its strength is only about one-tenth of that of reinforcing bars, and it is not an effective structure. In particular, the beam center where the bending moment stress is large is a weak point. (The central part of the beam refers to the two-quarters between the column inner surfaces)

Although the web plate part of the beam corresponds to the shear stress in terms of structural mechanics, it is useless and effective to have the same cross-section as the end part even though the center part of the beam is very small compared to the end part. It is not.

In view of the above-mentioned conventional drawbacks, the present invention aims to provide an RC structure that is effective in structural mechanics and is strong against earthquakes by an RC beam reinforcement method that can be implemented in a short time. Yes.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings. However, the drawings are for illustrative purposes only and do not limit the descriptive scope of the present invention.

In order to achieve the above object, according to the present invention, the web plate 2 connecting the upper and lower beam main bars is inserted in the center of the beam where the bending moment load acts on the RC beam. The structure is made into an H-shape that integrates three surfaces like H-shaped steel, and the RC beam reinforcement method is used in which the web plate reinforces the strength of the concrete.

In order to make the center of the beam into an H shape, a web plate 2 is inserted between the Kanzashi bars 5 orthogonal to the upper and lower beam main bars, and bolts are attached to the upper part of the web plate at regular intervals. The upper and lower beam main bars are pressed against the Kanzashi bar and the stirrup bar 11 by pressing the upper Kanzashi bar with the bolt, so that the structure of the beam bar becomes an H-shape by forming a flange plate. ) RC RC beam reinforcement method.

As is clear from the above description, the present invention has the following effects.
A web plate is inserted in the center of the beam where the bending moment stress of the beam is maximized according to the constitutional requirements of (Claim 1) and (Claim 2), and it is integrated with the upper and lower beam main bars to become like an H-shaped steel beam. The strength of the beam increases because it compensates for the weakness of the insufficient strength of the concrete.

As shown in FIGS. 1 and 5, a sleeve through-hole for duct equipment is provided in the central part of the beam with a small shear stress, which serves as a sleeve reinforcement. It becomes.

Hereinafter, the present invention will be described in detail by the best mode for carrying out the invention shown in the drawings.
FIG. 1 and FIG. 2 show the first preferred embodiment for carrying out the present invention. Reference numeral 1 is an RC beam with a web plate, and the web plate 2 is in contact with the main bars of the upper and lower beams via a Kanzashi bar 5. The Kanzashi muscle is pushed and fixed to the stirrup muscle 11 by the bolted fastening fitting 8 attached to the web plate.

Since the web plate 2 acts together with the strength of the concrete, it does not buckle even if its thickness is small. The size of the sleeve through-hole 3 also takes into account the size of the duct sleeve. No. 4 web plate lightening hole has another effect of being integrated with concrete. Reinforcing bar 5 is preferably a reinforcing bar from the viewpoint of workability, and the interval is about 1M. The 8 bolted metal fittings are at the same position as the Kanzashi muscle. The lower part of the 9 Kanzashi muscle fixing groove part cuts the web plate in an arch shape, and the upper part moves the Kanzashi muscle up and down, so that a grooved metal fitting is preferable. Since the stirrup muscle of 11 puts a web plate, the division | segmentation thing is more desirable on construction than a single thing.
{Different forms for carrying out the invention}

Next, different modes for carrying out the present invention shown in FIG. 3 and FIG. 6 will be described. In the description of the different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are denoted by the same reference numerals, and redundant description is omitted.

The second embodiment for carrying out the present invention shown in FIG. 3 and FIG. 4 is mainly different from the first embodiment for carrying out the present invention in that a web plate is divided and lightened to obtain a crane or the like. Construction can be done without using a lifting machine. The joint portion is integrated by welding, bolts, or both, and the same effect as the first embodiment can be obtained even if the RC beam reinforcing method is formed in this way.

In the third embodiment for carrying out the present invention shown in FIG. 5, the main difference from the first and second embodiments for carrying out the present invention is that the lattice structure is reduced in weight. The upper part of the cross member may be L-shaped steel, and the lattice material may be a rebar. Even if the RC beam reinforcing method is formed in this way, the same effect as the first embodiment can be obtained.

The present invention is used in the RC construction industry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a web plate and an enlarged view of a web plate of an RC beam reinforcing method according to a first embodiment for carrying out the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a web plate of an RC beam reinforcing method according to a first embodiment for carrying out the present invention. Side view of split joint type web plate and enlarged view of web plate of RC beam reinforcement method of second embodiment for carrying out the present invention The webplate sectional view of the RC beam reinforcement method of the 2nd form for carrying out the present invention. Lattice structure web plate side view and web plate enlarged view of RC beam reinforcement method of the third embodiment for carrying out the present invention The perspective view of the fastening metal fitting with a volt | bolt with which a web plate is mounted | worn, and a Kanzashi muscle fixing groove part.

Explanation of symbols

1-RC beam reinforcement beam 2-web plate 3-sleeve through-hole 4-web plate lightening hole 5-kandashi bar 6-beam main bar 7-beam main bar 8-bolt fastening bracket 9-kanzashi Muscle fixing groove 10-Sleeve 11-Stirrup muscle 12-Medium muscle 13-Strip plate

Claims (2)

In a reinforced concrete beam, a web plate 2 that connects the upper and lower beam main bars is inserted in the center of the beam where a large bending moment load is applied. The upper and lower beam main bars are made into flange plates, and the structure of the beam bars is integrated into three surfaces like H-shaped steel. Reinforced concrete beam reinforcement method in which the web plate reinforces the strength of the concrete with an H-shaped shape. In order to make the center of the beam into an H shape, a web plate 2 is inserted between the Kanzashi bars 5 orthogonal to the upper and lower beam main bars, and bolts are attached to the upper part of the web plate at regular intervals. The upper and lower beam main bars are pressed against the Kanzashi bar and the stirrup bar 11 by pressing the upper Kanzashi bar with the bolts, so that the flange bar is formed and the beam bar has an H-shaped structure. Reinforced concrete beam reinforcement method.

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