High-position beam falling construction method in box beam erection

Abstract

The invention discloses a high-position beam falling construction method in box beam erection, and belongs to the technical field of bridge construction. The construction method includes the following steps that concrete pouring is carried out on a pier cap for the first time, and box beam storing and jacking conditions and jack operation conditions in the beam falling process are met; the box beam is erected to the designed position, and supporting base mortar is not poured; the box beam is jacked, a crane sling of a bridge girder erection machine is not disassembled first, and box jacking and beam falling exercise simulation is carried out on a jack assisted by the bridge girder erection machine; the bridge girder erection machine returns to a beam field, the box beam is jacked to be higher than the design elevation by 420 mm, and a steel plate layer is arranged on four points to support the bottom of the box beam; a continuous beam longitudinal stress tendon is tensioned; the beam falls from the high position to the designed position, and the supporting base mortar is poured; concrete pouring is carried out on the pier cap for the second time. The high-position beam falling construction method is easy to operate and capable of shortening construction period and reducing construction cost, and construction is convenient.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for high-level falling beams in the erection of box girders. Background technique [0002] In the construction of high-speed railway box girder erection, due to the tight construction schedule and complex construction techniques such as continuous beams, cast-in-place beams, and basket arches, it is often encountered that the bridge erecting machine is erected to the continuous beams, but the continuous beams do not meet the tension conditions. At this time, the bridge erecting machine cannot pass through, and the bridge erecting machine needs to return to the end of the bridge, wait for the continuous girders to close and stretch the girder, or the bridge erecting machine turns around and erects another direction before returning to erect the girder. In this way, the construction period will be extended, and the problems of idle equi...

AI Technical Summary

Problems solved by technology

In this way, the construction period will be extended, and the problems of idle equipment and personnel on the site will be caused, and the construction cost will be increased.

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