A seamless construction method of super-long structure combined with sequence, skip, interval and reinforcement

By dividing the ultra-long structure into construction zones and using the intervals between concrete pouring and the haunch structure to replace the post-pouring strip, the problem of no operating space at the prestressing tensioning end was solved, achieving seamless construction and improving the crack resistance and construction efficiency of the structure.

CN122215530APending Publication Date: 2026-06-16THE FOURTH OF CHINA EIGHTH ENG BUREAU
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Patent Information

Application Number
CN202610593436.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-30
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

In the construction of ultra-long, large-span prestressed concrete structures, the elimination of post-pouring strips results in no operating space at the prestressing tensioning end, causing interference between the tensioning equipment and the longitudinal main reinforcement bars inside the main beam. Furthermore, sealing off the area makes it difficult to ensure the density of the concrete, creating weak areas and potential leakage hazards in the structure.

Method used

The construction method adopts a combination of sequential, skip-construction, intermittent, and reinforced construction. The tensile cracking risk threshold is set through equivalent continuous constraint calculation, the construction zone is divided, the intermittent time of concrete pouring is used to replace the post-pouring strip, and haunches and tension grooves are added to achieve spatial offset and high-density sealing of prestressed tendons.

Benefits of technology

Without cutting the reinforcing steel bars of the main beam, the problem of insufficient prestressing tension space was solved, which improved the crack resistance and construction efficiency of the structure and reduced the cost of turnover materials.

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Abstract

The present application relates to the field of building construction technology, and more particularly to a seamless construction method for super-long structure with sequence + jump + intermittent + reinforcement combination, comprising the following steps: S100, obtaining the temperature difference between the ambient temperature of the construction area and the internal structure, and calculating the constraint stress under different intermittent time combined with the concrete cooling rate to set the tensile cracking risk threshold of the structure; The present application couples the jump method, the sequence method and the pouring intermittent period hierarchical control based on the thermal mechanical characteristics of the component by setting the stress threshold based on the equivalent continuous constraint calculation, and replaces the spatial reservation of the traditional post-pouring strip with the free release mechanism of the initial state deformation; At the same time, the node reconstruction scheme of adding the side haunch structure of the main beam and reserving the tension groove is matched to bias the prestressed tension end in space, effectively solving the technical conflict of the non-working space of the prestressed tendon after the post-pouring strip is cancelled.
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