A telescopic shield for underground excavation

By designing inner and outer support ring modules for the retractable shield, and utilizing a power synchronous transmission module and pressure sensors, the shield can actively adapt to the deformation of the surrounding rock, thus solving the risk of shield jamming and the contradiction between support and drag reduction in traditional shield structures, and improving construction safety and efficiency.

CN122407217APending Publication Date: 2026-07-17BEIJING NO 4 MUNICIPAL CONSTR ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING NO 4 MUNICIPAL CONSTR ENG
Filing Date
2026-06-01
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The shield structure of existing underground excavation equipment has poor adaptability to large deformations of the surrounding rock, which can easily lead to shield jamming accidents. Furthermore, the contradiction between support and drag reduction is difficult to coordinate, affecting construction efficiency and safety.

Method used

The retractable shield adopts an inner and outer support ring module design and uses a power synchronous transmission module to drive the telescopic radial support assembly to realize the radial movement and curvature adjustment of the outer support plate. Combined with real-time control by pressure sensors, it can actively adapt to the deformation of the surrounding rock.

Benefits of technology

It improves the safety and self-rescue capabilities of equipment in adverse geological conditions, optimizes the support mode, reduces frictional resistance, and improves construction progress and safety.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122407217A_ABST
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Abstract

The application provides a telescopic shield for underground excavation, and relates to the technical field of underground engineering construction equipment. The shield comprises an inner support ring and an outer support ring module arranged outside the inner support ring. The outer support ring module comprises a plurality of outer support plates arranged at intervals in the circumferential direction, and adjacent outer support plates are connected through movable connecting pieces. A telescopic radial support assembly is arranged between each outer support plate and the inner support ring. The end of the telescopic radial support assembly away from the inner support ring is connected to the outer support plate, and the end pointing to the center can radially slide through the inner support ring and is connected to an internal power synchronous transmission module. When the telescopic radial support assembly moves radially, not only can the outer support plate be opened or closed to adjust the overall diameter of the shield, but also can continue to apply force to make the outer support plate deform to adapt to the profile of the surrounding rock after the outer support plate contacts the surrounding rock. Through the active variable-diameter and curvature self-adaptive adjustment mechanism, the problem that the existing shield is easy to be stuck in poor geology is solved.
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