Production process of novel concrete-filled steel tube composite structure

A technology of concrete filled steel tube and composite structure, which is applied to pillars, piers, columns, etc., can solve the problems of difficulty in ensuring the quality of concrete and difficulty in vibrating, so as to shorten the construction period, reduce the engineering cost, and improve the tensile strength.

Inactive Publication Date: 2012-08-08
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the technical problems existing in the prior art; it provides a manufacturing process of a new type of concrete-filled steel tube composite structure that solves the shortcomings of difficult vibration and difficult guarantee of concrete quality in the construction process of the steel tube concrete structure

Method used

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Embodiment

[0020] The manufacturing process of novel steel pipe concrete combined structure of the present invention comprises the following steps:

[0021] Step 1, mix the self-stressing cement, fiber, superfine admixture, and admixture evenly. The self-stressing cement adopts Portland self-stressing cement, sulphoaluminate self-stressing cement or aluminate self-stressing cement, and the dosage is 650kg / m 3 ~800kg / m 3 ; The fiber volume content is 1%-4% (the volume content here refers to 1%-4% of the volume of the fiber self-stressed self-compacting high-strength concrete); the superfine admixture is made of fly ash, mineral powder, silicon Powder any one or a mixture of two or three, the dosage is 100 kg / m 3 ~200kg / m 3 (Here, the proportion of admixture can be adjusted according to the required performance of the concrete, which can be any one of fly ash, mineral powder, silica fume or a mixture of two or three); the admixture is a high-efficiency water reducer, and the dosage is ...

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Abstract

The invention relates to a production process of a novel concrete-filled steel tube composite structure, comprising the following steps of: (1) mixing self-stressing cement, fiber, superfine admixture, and an additive evenly; (2) adding concrete mixing water to the mixture obtained by step 1 and stirring to produce cement slurry; (3) adding a fine aggregate to the cement slurry obtained by the step 2 and mixing evenly to produce cement mortar slurry; (4) adding a coarse aggregate to the cement mortar slurry obtained by the step 3 and mixing evenly to produce fiber self-stressing self-compacting high-strength concrete; and (5) pouring the fiber self-stressing self-compacting high-strength concrete obtained by the step 4 into a steel pipe and allowing the concrete set and stick to the steel pipe to form a steel tube fiber self-stressing self-compacting high-strength concrete composite structure. The production process provided by the invention has the advantages that: tensile strength, bending strength, toughness, impact resistance and fatigue resistance of concrete can be improved, ductility of components can be improved, long-term performance degradation of the components can be effectively reduced, construction procedures can be simplified, construction period can be shortened, and engineering cost can be significantly lowered.

Description

technical field [0001] The invention relates to a manufacturing process, in particular to a manufacturing process of a novel steel pipe concrete composite structure. Background technique [0002] The CFST structure has the advantages of high strength, good ductility, fatigue resistance and impact resistance. It is widely used in high-rise and super high-rise buildings, arch bridges and composite bridges, and large industrial plants. It solves the problem of brittle failure of reinforced concrete columns and meets the requirements of The design and use requirements of large-span and heavy-load bridges meet the requirements of large-span and fire protection for industrial plants, reduce construction costs, and shorten construction periods. However, there are still many problems in the use of concrete-filled steel tube structures. Concrete-filled steel tube columns, especially high-strength concrete-filled steel tube columns, are affected by the brittleness of the core concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C3/34
Inventor 卢亦焱李娜李杉李晓瑾薛继锋龚田牛
Owner WUHAN UNIV
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