An underground support structure and method under complex geological conditions

CN116446415BActive Publication Date: 2026-07-24THE NO 3 ENG LTD OF CHINA RAILWAY 22TH BUREAU GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE NO 3 ENG LTD OF CHINA RAILWAY 22TH BUREAU GRP
Filing Date
2023-04-28
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Under complex geological conditions, traditional support structures are unable to effectively support loose soil, resulting in a high risk of foundation pit collapse, and existing technologies are unable to meet the support requirements.

Method used

The support structure adopts a combination of a fastened steel pipe and a grouting nozzle with an expansion sleeve. Cement grout is injected to tightly connect the fastened steel pipe to the foundation, and the expansion sleeve is used to expand and compress the soil. The stability is enhanced by the combination of a support plate and reinforcing steel bars.

Benefits of technology

It improved the connection and stability between the supporting structure and the foundation, reduced the risk of foundation pit collapse, and enhanced the reinforcement effect of soft foundation.

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    Figure CN116446415B_ABST
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Abstract

The application discloses an underground support structure and method under complex geological conditions and belongs to the field of foundation support structures. The underground support structure comprises a support column, the support column comprises a fastening steel pipe for reinforcing a foundation, a plurality of shotcrete outlets for discharging slurry are formed in the outer wall of the fastening steel pipe, and cement slurry can penetrate into the interior of the foundation through the shotcrete outlets, so that the fastening steel pipe is more closely connected with the foundation. When the support column is installed, cement slurry is filled into the interior of the fastening steel pipe. The cement slurry flows out of the shotcrete outlets and penetrates into the interior of the foundation. A part of the cement slurry enters the expansion sleeve through the shotcrete outlets in the interior of the expansion sleeve. The expansion sleeve continuously expands as the cement slurry continuously enters the expansion sleeve. The surrounding soil is continuously extruded in the expansion process, so that the soil becomes more compact, and the fastening steel pipe is more closely connected with the foundation.
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