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Anti-crack method for concrete protecting layer

A concrete and protective layer technology, applied in the processing of building materials, construction, building construction, etc., can solve the problem of not considering the connection and strength coordination between steel mesh and structural steel, and not considering the size and form of steel mesh in detail, etc. problems, to achieve the effect of reducing the workload of fixed connection operations, improving the appearance quality, and facilitating construction operations

Active Publication Date: 2013-09-25
CHINA 19TH METALLURGICAL CORP CHENGDU CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach does not consider the size and form of the steel mesh in detail, nor does it consider the connection and strength coordination between the steel mesh and the structural reinforcement.

Method used

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  • Anti-crack method for concrete protecting layer
  • Anti-crack method for concrete protecting layer
  • Anti-crack method for concrete protecting layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 adopts the inventive method to make anti-crack concrete protective layer

[0058] a. Initially poured concrete: poured to 10mm below the lower edge of the main reinforcement of the outermost structure;

[0059] b. Arrangement of steel mesh: After the initial setting of the poured concrete and before the final setting, the steel mesh is arranged at the design position by light hammering; among them, the original concrete protection thickness H is 80mm, and the minimum protection layer required by the specification is 25mm , the thickness of the protective layer of the steel mesh is taken as 20mm, and the steel mesh adopts the method of fully binding three layers of steel mesh sheets, and the vertical distance between two adjacent layers of steel mesh sheets is a=25mm; the steel mesh is from outside to inside, and the outermost layer The steel bars in the steel mesh layer are all taken as d1=d2=5mm, D1=D2=50mm; the diameter of the horizontal steel bar in the ...

Embodiment 2

[0063] Embodiment 2 adopts the inventive method to make anti-crack concrete protective layer

[0064] a. Initially poured concrete: poured to 10mm below the lower edge of the main reinforcement of the outermost structure;

[0065] b. Arrangement of steel mesh: After the initial setting of the poured concrete and before the final setting, the steel mesh is arranged at the design position by light hammering; among them, the original concrete protection thickness H is 50mm, and the minimum protection layer required by the specification is 25mm , the thickness of the protective layer of the steel mesh is 25mm, and the steel mesh is a single-layer steel mesh layer bound in a full-tie manner; wherein, in the steel mesh layer, d1=d2=6mm, D1=D2=50mm; the diameter of the supporting anchoring steel bar is 8mm.

[0066] c. Pouring concrete: continue to pour concrete until the pouring is completed;

[0067] d. After the concrete is poured and before the final setting, the offset steel m...

Embodiment 3

[0069] Embodiment 3 adopts the inventive method to make anti-crack concrete protective layer

[0070] a. Initially poured concrete: poured to 10mm below the lower edge of the main reinforcement of the outermost structure;

[0071] b. Arrangement of steel mesh: after the initial setting of the poured concrete and before the final setting, the steel mesh is arranged at the design position by light hammering; among them, the original concrete protection thickness H is 60mm, and the minimum protection layer required by the specification is 20mm , the thickness of the protective layer of the steel mesh is 20mm, and the steel mesh is a 2-layer steel mesh bound in a full-tie manner; the vertical distance between two adjacent layers of steel mesh sheets is a=20mm; the steel mesh is from outside to inside, and the outermost layer of reinforcement In the mesh layer, d1=d2=5mm, D1=D2=50mm; in the innermost steel mesh layer, the diameter of transverse reinforcement=longitudinal reinforcem...

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Abstract

The invention relates to an anti-crack method for a concrete protecting layer and belongs to the field of reinforced concrete construction. The anti-crack method includes: a, preliminarily pouring concrete to a position which is below structural main reinforcement and 10-20mm away from the outermost structural main reinforcement; b, fixing a rebar mesh at a design position after preliminary setting of the concrete and before final setting of the concrete; c, continuing pouring concrete unit pouring is finished; d, leveling and maintaining; wherein the design position is characterized in that the distance between the outer surface of the rebar mesh and the surface of the formed concrete accords to the required minimum protecting layer thickness. By the method which is simple, fast and the like, strength of reinforced concrete can be increased, concrete cracks can be avoided, and concrete appearance quality is increased. In addition, the rebar mesh can be constructed outside a construction site, separated construction is achieved.

Description

technical field [0001] The invention relates to an anti-cracking method for a concrete protective layer, belonging to the field of reinforced concrete construction. Background technique [0002] During the construction of reinforced concrete, the thickness of the protective layer is easy to peel off and crack due to the plain concrete without steel bars. This phenomenon is more obvious when the thickness of the protective layer is greater than 50mm. At present, the commonly used treatment methods are by adjusting the concrete mix ratio and increasing the number of times of lightening after pouring. Prevention and treatment of possible cracks. This treatment method has no obvious treatment effect on the thicker protective layer. Even if the cracks are controlled to a certain extent by increasing the strength of the concrete and increasing the number of times of light collection, the plain concrete is too thick. If the protective layer is used for a long time, the plain concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/02
Inventor 宋明健
Owner CHINA 19TH METALLURGICAL CORP CHENGDU CONSTR
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