JP2001032532A - Method for reinforcing shear capacity in concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the peeling prevention and reinforcing effect of a reinforcing material by fixing a lattice material comprising a carbon fiber on the surface of an existing concrete structure by an anchor, and applying polymer cement mortar thereon. SOLUTION: When an existing concrete structure 1 comprising reinforced concrete or the like is reinforced, a lattice material or a mesh material 2 making a material of the carbon fiber of lightweight, high strength, high elasticity and rust proof property is fixed on the surface of the structure. The fixing is done by incorporating an anchor 3 having a fixing piece extending laterally on a head part in the concrete structure 1, and the lattice material 2 is sandwiched by a fixing piece to be bonded. Next, high adhesive polymer cement mortar 4 is sprayed or applied with trowel or it is injected. The concrete structure 1, a lattice-like reinforcing material 2 and the polymer cement mortar 4 are integrated to be fixed. Thereby the reinforcing material 2 does not peel, and a large reinforcement effect for shear capacity can be expected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a shear strength of a concrete structure.

[0002]

2. Description of the Related Art Conventionally, when reinforcing shear strength of a girder of a concrete structure, a reinforcing material is attached to a side surface or
Alternatively, it is wound in a U-shape, but its ultimate proof strength is generally determined by the peeling of the repair agent, so that a large shear reinforcing effect cannot be expected.

Furthermore, when reinforcing a girder, it is often impossible to wind a reinforcing material, and it is necessary to check the proof strength by an appropriate method such as when reinforcing with a steel plate.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention
A grid-like material made of carbon fiber is fixed to an anchor at the interface with the existing concrete with an anchor, and the shear strength of the repaired portion is to be obtained using a high-adhesion polymer cement mortar.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to an existing concrete structure which is provided on a surface of the structure.
Shearing in concrete structures characterized by attaching a grid material made of carbon fiber with an anchor and spraying polymer cement mortar from above, troweling or pouring to fix the grid material It consists of a proof stress reinforcement method.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. In an existing concrete structure (1), a carbon fiber is used as a material for the surface (1a) of the structure (1). A lattice-like material (2) is attached, fixed with an anchor (3), and a polymer cement mortar (4) is sprayed from above, troweled or injected to form a layer having a predetermined thickness, and an existing concrete structure is formed. A method for reinforcing a shear strength of a concrete structure, characterized in that reinforcement is performed by integrally fixing an object (1), a lattice-like material (2) and a polymer cement mortar (4).

The existing concrete structure (1) refers to a reinforced concrete structure, a prestressed concrete structure and the like.

The basic characteristics of the lattice-like material (2) made of carbon fiber are that the material has high strength, high elasticity, rust resistance, light weight, and Alternatively, they are formed in a lattice shape as shown in FIG.

Then, the existing concrete structure (1)
The existing concrete structure (1) can be used by spraying, troweling or pouring polymer cement mortar (4) through the lattice-like material (2), and using the anchor (3). The thickness of the polymer cement mortar (4) to be sprayed is preferably, for example, such that the test rod (3a) of the anchor (3) is buried.

The anchor (3) is formed substantially in an L-shape with a column body and a fixing piece extending laterally at the upper end, and the column body is driven into an existing concrete structure (1), and is fixed by the fixing piece. A grid material (2) is sandwiched and fixed.
As described above, this is used as a guide for judging the thickness (fogging) of the polymer cement mortar (4) to be sprayed with the measuring rod (3a) protruding from the column body.

[0011]

According to the present invention, a grid-like material made of carbon fiber is fixed to an existing concrete structure with an anchor, and a polymer cement mortar is sprayed thereon to form a predetermined thickness layer. Thereby, an extremely beneficial effect is obtained such that the concrete structure, the lattice-like material, and the polymer cement mortar can be integrally and fixedly reinforced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a side view showing one embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing one embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a front view showing an embodiment of a grating used in the present invention.

FIG. 6 is a front view showing another embodiment of the grating used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing concrete structure 1a Surface 2 Grid material made of carbon fiber 3 Anchor 3a Test rod 4 Polymer mortar

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[Procedure amendment]

[Submission date] July 27, 1999 (July 7, 1999
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

Continuation of the front page (71) Applicant 599104370 Nefcom Co., Ltd. 2-23 Kanda Awajicho, Chiyoda-ku, Tokyo (71) Applicant 391010183 Kyokuto Kogyo Co., Ltd. 2-6-1 Hikaricho, Higashi-ku, Hiroshima-shi, Hiroshima (71) Application Person 593225161 Ashuo Yonekura 5-12-301 Minamitakeya-cho, Naka-ku, Hiroshima-shi, Hiroshima (72) Inventor Kimiaki Zaitsu 1-7-1, Maizuru-cho, Oita-shi, Oita Pref. 1 1-33-1 Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa Prefecture Nara Construction Co., Ltd. (72) Inventor Akira Kobayashi 3-8 Nihonbashi Kobunacho, Chuo-ku, Tokyo Inside Nippon Steel Composite Co., Ltd. (72) Inventor Kenichi Sekine (23) Inventor Yasuo Kawauchi 2-6-31 Hikaricho, Higashi-ku, Hiroshima City, Far East Kogyo Kogyo Co., Ltd. (72) Inventor Ashuo Yonekura Hiroshima City, Hiroshima Prefecture 5-12-301, Minamitakeya-cho, Naka-ku F-term (reference) 2E164 AA05 AA11 AA13 CB11 CB25 2E176 AA01 BB29

Claims (1)

[Claims] In an existing concrete structure, a lattice-like material made of carbon fiber is attached to the surface of the existing structure and fixed with an anchor, and a polymer cement mortar is sprayed, troweled, or injected from above. A method for reinforcing a shear strength in a concrete structure, wherein the reinforcement is performed by forming a predetermined thickness layer.