现浇连续梁支架结构受力分析

Stress Analysis of Cast-in-situ Continuous Beam Bracket Structure

根据沪宁城际高速铁路节点工期总体安排要求,站前V标段跨越旺庄路(40+56+40)m连续梁采用支架现浇法施工。连续梁主跨采用装配式钢梁支架系统现浇施工,荷载主要集中于箱梁腹板对应的A区域,故进行A区域内主钢梁和次钢梁的荷载计算、抗弯强度计算、挠度计算及钢管柱的稳定性计算;连续梁边跨选择满堂碗扣式脚手架作为支架结构,主要从墩柱间脚手架和腹板间脚手架2个方面进行荷载计算、立杆的稳定性计算;从主跨和边跨2个方面表述了整个现浇连续梁支架结构系统对地基的影响,通过计算分析对地基采取了相应的处理措施。文章结合沪宁城际高速铁路的施工实例,阐述了现浇连续梁支架结构的受力分析。

According to the overall arrangements for the construction period of Shanghai-Nanjing intercity railway, cast-in-situ bracket method is adopted for 40＋56＋60 m continuous beam crossing Wangzhuang road in section V in front of the station, fabricated girder bracketry is adopted for the main span of the continuous beam by cast-in-situ method. The load mainly concentrates in the region A corresponding to the box beam web, so the load calculation, bending strength and deflection calculation of the main steel girders and secondary beams within region A and stability calculation of steel pipe columns are performed. Bowl-scaffold is selected as the supporting structure for the side span of continuous beam supported by, the load calculation and stability calculation of the vertical pole are performed based on scaffolds between piers and webs;the impact of cast-in-situ continuous beam support structure system on the foundation is presented from the main span and side span and corresponding measures have been taken to the foundation by computational analysis. Combined with the practical construction of Shanghai-Nanjing intercity high-speed railway, this paper sets forth the stress analysis of bracket structure of cast-in-situ continuous beam.