Beam-column joint high-low grade concrete intercepting device

By using an interception device consisting of airbags, fixing rods, and backing rods at the beam-column joint, the problems of wire mesh blocking affecting construction progress and difficulties in blocking irregular cross-sections in existing technologies have been solved, achieving efficient interception at the beam-column joint and ensuring construction quality.

CN224379422UActive Publication Date: 2026-06-19CHINA STATE CONSTR INT ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHINA STATE CONSTR INT ENG CO LTD
Filing Date
2025-07-24
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, the wire mesh sealing method at beam-column joints has problems such as affecting construction progress, hindering the bonding of new and old concrete, and making it difficult to seal irregular cross-sections, resulting in a weakening of the shear resistance of the beam-column joint.

Method used

A high- and low-grade concrete interception device is adopted, which includes an airbag, a fixing rod, and a backing rod. The airbag supports the beam stirrups and the fixing rod and backing rod form a support surface to intercept high-grade concrete and prevent low-grade concrete from flowing into the joint area.

Benefits of technology

It effectively ensures the construction quality of beam-column joints, adapts to different cross-sectional shapes, is easy to operate, is suitable for various construction environments, and ensures the shear bearing capacity and seismic performance of beam-column joints.

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    Figure CN224379422U_ABST
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Abstract

This utility model discloses a device for intercepting high and low grade concrete at beam-column joints, relating to the field of building construction technology. It includes airbags, fixing rods, and backing rods. The airbags are closely arranged at the beam end sections near the column surface, inserted between the main reinforcement bars of each beam, with their front faces towards the column surface. The fixing rods are erected to the top of the main reinforcement bars of each beam at the top layer. Each backing rod is inserted between the main reinforcement bars of each beam, with its top end connected to the fixing rod, its front side tightly against the airbag, and its bottom end tightly against the side of the corresponding beam stirrup near the column surface. This utility model forms a support surface through the fixing rod, each backing rod, and the beam stirrup against which each backing rod is attached. The airbags are supported by their backs, effectively intercepting high-grade concrete at the beam-column joint, preventing low-grade concrete from flowing into the beam-column joint area, and ensuring the construction quality of the beam-column joint. The overall length of the fixing rod and the length of the backing rod are adjustable, adapting to the interception needs of beams with different cross-sectional shapes.
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