JP2005188142A - Reinforcing structure for concrete foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure for a concrete foundation sufficiently endurable against horizontal force by lateral swinging of an earthquake. <P>SOLUTION: In this invention described on the claim item 1, an anchor bolt 13 is the reinforcing structure for the concrete foundation 16 erected by embedding its lower end part. The embedding part periphery of the anchor bolt 13 of an upper end part of the concrete foundation 16, is reinforced by a reinforcing material 11 capable of reinforcing to the horizontal force. The reinforcing material is formed of any of a rust preventive material or a reinforcement bar of applying rust preventive treatment and a shape steel piece. The embedding depth of an upper end part of the reinforcing material is less than 4 centimeters. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing structure for a concrete foundation that is resistant to horizontal forces such as earthquake rolls.

Conventionally, a concrete foundation has a building floor beam portion fastened with anchor bolts embedded in the concrete, and the load of the entire building is transmitted to the concrete foundation to firmly support the building on the concrete foundation. Reinforcing steel uses ordinary reinforcing bars and requires a covering thickness of 4 centimeters or more for rust prevention, and is buried at a depth of 4 centimeters or more.
The anchor bolt is bent at the lower end and attached to the concrete portion, and the strength is maintained so as to withstand vertical and horizontal forces. From the viewpoint of structural strength, the concrete foundation is reinforced by embedding reinforcing bars, and a main reinforcing bar portion erected in parallel with the anchor bolt is embedded near the base portion and the central portion at the lower end. If the concrete foundation is laid at the base part at the lower end, the concrete adheres well to the vertical force, but if a horizontal force such as an earthquake rolls, the horizontal load will concentrate around the anchor bolt. It is easy to reinforce the periphery of the anchor bolt.

As a reinforcing structure, for example, as described in Patent Document 1, it is known to reinforce the anchor bolt embedding peripheral portion of the upper end portion of a concrete foundation with a reinforcing material against a horizontal force, which is a concrete foundation. It works effectively on the overall adhesion strength.
Japanese Patent Laid-Open No. 11-152755

Subsequent research has revealed that the reinforcement to the horizontal force around the anchor bolt embedded portion is shallower, that is, the reinforcement effect is higher when the anchor bolt is provided at a position as high as possible.
However, if the reinforcing material around the anchor bolts is placed as high as possible as described above, a cover thickness of 4 cm or more cannot be provided as with ordinary reinforcing bars, and there is a problem in rust prevention performance and durability. (Embedding depth) Reinforcement at a high position of less than 4 centimeters was not made.

  The present invention solves the above problems. An object of the present invention is to provide a reinforcing structure for a concrete foundation that is durable and can sufficiently withstand a horizontal force caused by a roll such as an earthquake.

The present invention according to claim 1 is a reinforcing structure of a concrete foundation in which an anchor bolt is erected with its lower end embedded, and the anchor bolt embedded portion periphery of the upper end of the concrete foundation is against horizontal force. Reinforced with a reinforcing material that can be reinforced, the reinforcing material is formed of a rust-proof material or a rust-proof reinforcing bar, a wire mesh, or a steel slab, and the embedding depth of the upper end of the reinforcing material is 4 cm. It is characterized by being less than a meter.
(Function)

In the reinforcing structure for a concrete foundation according to claim 1, the anchor bolt embedded portion periphery of the upper end portion of the concrete foundation is reinforced with a reinforcing material capable of reinforcing against a horizontal force, and the reinforcing material is provided from the upper end portion of the concrete foundation. Since the embedment depth is reinforced by a reinforcing material of less than 4 centimeters, the reinforcement effect up to the highest position of the foundation can be obtained, and it can sufficiently withstand the horizontal force caused by rolling such as earthquakes.
Furthermore, since the reinforcing material is formed of any of reinforced anti-corrosion bars, wire mesh, and shaped steel slabs, the anti-rust effect is exhibited even if the embedding depth from the upper end is less than 4 cm. Durability is good. Reinforcing bars, galvanized finishes, and rust-proof reinforcing bars, shaped steel pieces, and wire mesh are used as reinforcing materials. Further, if a part or the whole of the main reinforcing bar is subjected to a rust prevention treatment, the main reinforcing bar may be extended upward to use as a reinforcing material, or stainless steel as a rust-proofing material may be used as the reinforcing material.

    The concrete foundation reinforcement structure according to claim 1 is such that the periphery of the anchor bolt embedded portion at the upper end of the concrete foundation is reinforced to the highest position of the foundation to obtain the maximum reinforcement effect, which is sufficient for horizontal force due to rolling such as an earthquake. Can withstand. And since the reinforcement material is rust-proofed, durability is also favorable.

Hereinafter, the present invention will be described in more detail with reference to examples.
FIG. 1 is an explanatory view showing the first embodiment. FIG. 1A is a cross-sectional view of the foundation when the rust-proof reinforcing material 11a is a horizontal bar-shaped reinforcing material and 11b is a vertical bar-shaped reinforcing material. It is sectional drawing of AA arrow.
FIG. 2 is an explanatory view showing the second embodiment. FIG. 2A is a cross-sectional view of the foundation when the main bars 13 and 14 are rust-proofed and extended upward to form reinforcing members 11b and 12b. FIG. It is sectional drawing of A arrow.
FIG. 3 is an explanatory view showing the third embodiment, wherein FIG. 3 is a sectional view of a foundation in which a reinforced anti-corrosion shaped steel piece is attached to an anchor bolt 13, FIG. 3B is a plan view, and FIG. FIG. 3 is a perspective view of a state in which a shape steel piece that is a reinforcing material 11e is inserted into an anchor bolt 13;

First, an outline will be described in common with the first to third embodiments. All the figures are sectional views of the foundation and represent the periphery of the anchor bolt. Although not shown in the figure, the foundation is formed of a bottom plate portion 16a and a rising portion 16b as shown in a cross section having an inverted T shape. There are independent foundations, cloth foundations, and solid foundations with integrated bottom bases, which are designed according to the nature of the ground, but the cross-sectional shapes of the rising parts are substantially the same. Further, the thickness of the covering between the reinforcing bars and the outer surface of the concrete is structural strength, and the outer wall surface of the building is larger than the inner wall side.
The horizontal main bar 13 and the vertical main bar 14 are arranged in the horizontal direction and the vertical direction in the bottom board part 16a and the rising part 16b, respectively (the arrangement of the bottom board part 16a is not shown). A building is placed on top of the rising portion 16b. All the reinforcing members 11 are installed above the horizontal main bars 13.
In addition, the anchor bolt has an upper end projecting from the top of the concrete foundation 15 and the other end than the upper end is embedded in the rising portion 15b.

  In the first embodiment (FIG. 1), 11a in FIG. 1B is a bar-shaped horizontal reinforcing material that has been rust-proofed by hot dip galvanizing, and 12a is a bar-shaped vertical reinforcing material that has been rust-proofed by hot-dip galvanizing. 16 is installed above the horizontal main bar 14 and the vertical main bar 15 around the anchor bolt 13 which is erected with the lower end embedded in the rising part 16b, and the shallowest part embedded in the concrete foundation is 4 cm. It is buried in less than. If it does in this way, it will have a reinforcement effect to the highest position of the rising part 16b of a concrete foundation, and durability will also be favorable, without a reinforcement material rusting.

In the second embodiment (FIG. 2), 11b and 12b in FIG. 2B are reinforcements that extend the main bars upward and are rust-proofed by galvanization, and the lower end is embedded in the rising portion 16b of the concrete foundation 16 It is installed around the anchor bolt 13 that is erected.
The upper end portion of the horizontal reinforcing member which is the horizontal reinforcing member 11a and the vertical reinforcing member 12b is embedded and installed at a position less than 4 cm from the upper end of the rising portion 16b of the concrete foundation 16. In this way, the main reinforcement and the reinforcing material are completely integrated, so that the reinforcing effect is improved, and further, the reinforcing effect is obtained up to the highest position of the rising portion 16b of the concrete foundation, and the reinforcing material does not rust and has good durability. . Rust prevention can also be achieved with a zinc rich paint containing zinc powder instead of zinc plating.

In the third embodiment (FIG. 3), 11c in FIG. 3B is a reinforcing material formed of a steel slab that has been rust-proofed by hot dip galvanizing, and anchor bolts 13 embedded in the rising portion 16c of the concrete foundation 16. It is installed in the vicinity. As shown in the figure, the shape of the reinforcing member is set in a state in which an opening hole is provided in the mold steel piece and the anchor bolt 13 is inserted and fixed to the anchor bolt 13. The embedment depth of the reinforcing material 11c is buried at a depth of less than 4 cm from the upper end of the foundation at the shallowest place.
Since the reinforcing material 11c is fixed in advance, the anchor bolt is fixed so as to be placed on the horizontal main bar 14 from the foundation before placing the concrete.
Since the reinforcing material 11c made of L-shaped steel frame is embedded at a position less than 4 cm from the upper end of the foundation and is rust-proofed, the adhesion strength around the anchor bolt 13 is reinforced against vertical and horizontal forces, and is durable. Excellent in properties.

In the reinforcing structure of the concrete foundation 16, the reinforcing material 11 is installed around the upper end of the embedded portion of the anchor bolt 13 in order to reinforce the adhesion strength of the anchor bolt 13 against a horizontal force.
When the reinforcing material 11 is made of rust-proof reinforcing steel bars or steel slabs, the foundation around the anchor bolt 13 is reinforced, it can retain sufficient adhesion strength against horizontal loads, and is buried below 4 cm from the upper end of the foundation. The maximum reinforcement effect is obtained, and it is excellent in durability without rusting.
Moreover, if the reinforcing material 11 and the anchor bolt 13 are fixed together in advance, the work at the site can be simplified.

The reinforcement effect of the concrete foundation of a house is effective and can be applied to a durable reinforcement structure.

Explanatory drawing which shows 1st Example. Explanatory drawing which shows 2nd Example. Explanatory drawing which shows 3rd Example.

Explanation of symbols

11a, b Reinforcement material 12a, b Reinforcement material 11c Type steel slab 13 Anchor bolt 14 Horizontal main bar 15 Vertical main bar 16 Concrete foundation 16a Bottom plate part 16b Standing part

Claims (1)

The anchor bolt is a reinforcing structure of a concrete foundation that is erected with its lower end embedded, and the anchor bolt embedded part periphery of the upper end of the concrete foundation is reinforced with a reinforcing material capable of reinforcing against horizontal force, The reinforcing material is a rust-proof material, or is formed of any one of rust-prevented wire mesh, reinforcing bar, and shaped steel piece, and the embedded depth of the upper end of the reinforcing material is less than 4 cm Reinforced structure of concrete foundation characterized by

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