Detachable steel-concrete composite structure post-cast joint based on electrothermal alloy sleeve

By using detachable electric heating alloy grouting sleeves and high-performance grouting materials in precast concrete components, and utilizing the built-in heat source to achieve rapid and precise disassembly and lossless recycling of components, the problems of complex disassembly and fragile components in the existing technology are solved, and the reuse efficiency of components is improved.

CN119981271BActive Publication Date: 2025-10-17ZHEJIANG UNIV
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Patent Information

Application Number
CN202510205562.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-02-24
Publication Date
2025-10-17
Estimated Expiration
2045-02-24

AI Technical Summary

Technical Problem

The disassembly of precast concrete components in existing prefabricated structures is difficult to achieve quick and precise separation, and the reused components are easily damaged. Existing detachable nodes require large external forces during dismantling, which is complex and unstable and difficult to meet the needs of complex engineering environments.

Method used

A detachable electric heating alloy grouting sleeve is used to connect the stressed steel bars in the precast concrete slab and fill it with high-performance removable grouting material. An external power supply forms a built-in heat source, causing the high-performance concrete and grouting material to undergo solid-liquid conversion at the phase change temperature, reducing the strength and self-falling, thereby achieving lossless separation of the components.

Benefits of technology

It achieves rapid, precise separation and lossless recycling of precast concrete components, simplifies the disassembly process, improves the reusability of components, and reduces energy dissipation and loss of steel connection strength.

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Abstract

The application discloses a detachable steel-concrete composite structure post-cast joint based on an electric heating alloy sleeve, which comprises a prefabricated concrete slab, stress-receiving steel bars in the prefabricated concrete slab, detachable electric heating alloy grouting sleeves, high-performance detachable grouting materials and high-performance detachable concrete. The connecting surfaces of the prefabricated concrete slabs on the two sides of the joint are aligned, a post-cast area is reserved between the two slabs, and the post-cast area is filled with the high-performance detachable concrete. The stress-receiving steel bars in the prefabricated concrete slab are connected through the detachable electric heating alloy grouting sleeves in the post-cast area, the sleeves are filled with the high-performance detachable grouting materials, and the detachable electric heating alloy grouting sleeves are composed of high-strength bolt connecting assemblies, upper and lower half-round positioning sleeves and high-temperature-resistant conductive modules. The application solves the problem that the connecting joint of the prefabricated concrete component is difficult to break, provides a convenient and safe heating operation mode, realizes efficient disassembly, guarantees reusability, and has remarkable economic benefits and environmental protection values.
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