Shield lining opening ring beam method based on non-bonded prestress

Abstract

The application belongs to the technical field of shield lining and specifically relates to a shield lining opening ring beam method based on unbonded prestress, which comprises the following steps: S1, prefabricating a pipe piece of the opening ring; S2, hot melt welding; S3, cast-in-situ lining the opening ring beam; S4, steel strand threading; and S5, filling. The application increases the overall stability of the pipe piece at the opening, and conveniently performs supplementary tensioning or cuts off the anchorage device from the top ring beam and takes out the prestressed steel strand from the bottom ring beam to realize quick replacement. The application can not only avoid the blockage of the pore channel of the HDPE corrugated pipe by the concrete slurry during the prefabrication and pouring of the pipe piece, but also facilitate the subsequent steel strand threading and tensioning. The application can quickly close the HDPE corrugated pipe, and simultaneously realize the quick steel strand threading by pulling the steel wire rope, thereby reducing the internal damage of the HDPE corrugated pipe.

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