Precise positioning construction control method of symmetrical cantilever assembled bridge

Abstract

The invention provides a symmetric cantilever assembly bridge accurate positioning construction control method. The method comprises the following steps that (1) sleeves or holes are reserved in the reference block segment precast process, reference block precast cantilever assembly segments are mounted through a wet connection method, and wet joint concrete is poured; (2) the sleeves are pre-buried in a structure body in the bent cap pouring process, a suspension system is mounted through screws in the sleeves which are preinstalled in a bent cap in a fastened mode, and adjustable spiral jacks are adopted for supporting the suspension system; (3) the reference block precast segments are hoisted to the ends of suspension beams through suspenders and are fixed to the suspension system; (4) the reference block segments are adjusted to the design position through measurement and check by means of the suspension system, outer pull rods penetrate through the bent cap, and inner bracing devices are mounted between the reference block precast segments and the bent cap; and (5) after fixation is completed, a formwork is mounted, concrete is poured, equal strength stretch-draw is conducted, a rigid framework system is formed, and accurate positioning of reference blocks is achieved.

Description

technical field [0001] The invention relates to the technical field of bridge construction precision control, in particular to a precise positioning construction control method for a symmetrical cantilever assembled bridge. Background technique [0002] In the construction of bridge structures, the joint-by-section symmetrical cantilever assembly method has the characteristics of less equipment and site requirements than the entire span erection. Especially for urban bridge projects, a single construction only needs to lift and operate two lengths on both symmetrical sides of the pier column. The segment, which is about 1 / 12-1 / 10 of the length of a single span, better reflects the characteristics of prefabricated construction components and factories. The segment-by-segment assembly of the cantilever decomposes the one-time erection of the whole span into several stages and adopts segment-by- segment matching and splicing. After the cantilever system is completed, it needs t...

AI Technical Summary

Problems solved by technology

Usually, the positioning method of the reference block is fixed by a hanger or a bracket system, but the rigidity of the hanger is used only for the suspension, and it is easy to shake after positioning at the same time, which will affect the assembly accuracy of the subsequent segments; while the bracket method is used for segment positioning. It has a great impact on the site, materials, etc., and it is difficult to adjust the accuracy

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