Construction method of bridge abutment in cliff section tunnel

By employing a combination of rigid frame bridges, equal-section double-limb thin-walled piers, and prestressed concrete T-beams inside the tunnel in steep cliff sections, along with pileless foundation caps, the problem of tunnel topography damage caused by the construction of large bridge abutments inside the tunnel in steep cliff sections was solved, thereby reducing construction risks and saving costs.

CN117211192BActive Publication Date: 2026-07-24中铁二十局集团第三工程有限公司 +1
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Patent Information

Application Number
CN202311357357.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-18
Publication Date
2026-07-24
Estimated Expiration
2043-10-18

AI Technical Summary

Technical Problem

In existing technologies, conventional construction methods are prone to damaging the original topography of the tunnel portal when constructing bridge abutments in steep cliff sections, resulting in high construction risks, long construction periods, and high costs, and it is difficult to effectively simplify the construction steps.

Method used

The superstructure is formed by a rigid frame bridge, the substructure is formed by double-limb thin-walled piers with equal cross-section, and the superstructure of the approach bridge is formed by simply supporting prestressed concrete T-beams. The substructure is constructed with abutments without pile foundations to form a large bridge abutment inside the tunnel in the steep cliff section.

Benefits of technology

The construction steps for the bridge abutment inside the tunnel in steep cliff sections were simplified, reducing construction difficulty and risks, shortening the construction period, and reducing project costs.

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Abstract

The application discloses a kind of cliff section hole inside bridge abutment construction methods, it is related to cliff section hole inside bridge abutment construction field, the cliff section includes upper slope and lower slope, the method includes: using rigid frame bridge in the cliff section hole inside construction formation upper structure;Using equal-section double-limb thin-walled pier, pile foundation in the cliff section hole inside construction formation lower structure by pile cap;Using prestressed concrete T beam, first simply supported then structure continuous formation approach bridge upper structure;Using the mode of no pile foundation, in the lower structure do abutment cap, form the cliff section hole inside bridge abutment of the application.By respectively in the cliff section hole inside construction formation upper structure and lower structure, and using the mode of no pile foundation, form the cliff section hole inside bridge abutment of the application, simplify construction step, reduce the construction difficulty of cliff section hole inside bridge abutment, thereby reduce construction risk, while ensuring construction quality, shorten construction period long, reduce engineering cost high.
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