Counter-force pre-pressing system and pre-pressing method for ultrahigh cantilever beam 0 # block support

Abstract

The invention belongs to the technical field of bridge construction safety and in particular relates to a counter-force pre-pressing system and pre-pressing method for an ultrahigh cantilever beam 0 #block support. The system comprises steel pipe supports erected on bearing platforms on the two sides of a pier column. A bottom template is arranged at the tops of the steel pipe supports and the pier column; the upper end of the bottom template is provided with a plurality of distribution beams which are uniformly arranged along the transverse full length of the bridge; each distribution beam is provided with three groups of jacks which are uniformly arranged along the length direction of the bridge; the top of each jack is provided with a bailey truss arranged in the transverse direction of the bridge in a full-length mode. A plurality of finish rolling deformed steel bars are pre-buried in the top of each pier column, the finish rolling deformed steel bars penetrate through the baileytrusses and limit the bailey trusses between the jacks and the limiting assemblies through the limiting assemblies arranged at the tops of the bailey trusses, the jacks are electrically connected with an intelligent tensioning machine, and the counter-force pre-pressing system has the advantages of being simple in structure and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of bridge construction safety, and in particular relates to a counterforce preloading system and a preloading method for 0# block brackets of super-high cantilevered beams. Background technique [0002] At present, in the construction of continuous steel bridges, the cantilever pouring method has developed into a mature construction technology. The 0# block is an important component to undertake the lower and upper cantilever sections of the continuous girder bridge. In order to ensure that the continuous girder meets the According to the design dimensions and deflection requirements, check the overall stability of the support and the actual bearing capacity of the support, overcome the uneven settlement of the support during the concrete pouring process, and avoid cracks in the continuous beam concrete due to the uneven settlement of the support. The ballast test of the support must be carried out beforehan...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a counter force preloading system and preloading method for the 0# block bracket of an ultra-high cantilevered beam, which solves the problem that the actual load distribution is not uniform in the traditional surcharge preloading method, which is difficult to simulate and realize. The method Simple, easy to operate, reduce construction period, reduce labor intensity, save mechanical costs, solve the problems of long time-consuming hoisting, load holding, and unloading of piled loads and high costs in traditional piled preloading construction, and eliminate piled load preloading construction There are hidden safety hazards such as the collapse of piled loads, which effectively reduces safety risks and improves economic benefits

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