不同地形条件下的现浇箱梁支架设计研究

Research on the Design of Cast-in-place Box Girder Supports under Different Terrain Conditions

湖北山区某高速公路枢纽互通立交共设计了20联现浇箱梁支架,具有施工规模庞大、墩柱高度较高的特点,由于该地区地势起伏较大、山体陡峭,地基覆盖层厚,使得现浇箱梁支架基础施工受到较大影响,支架设计难度大。因此,文章在梳理常规支架优劣势的基础上,结合上述工程案例,对不同地形条件下的现浇箱梁支架设计展开分析研究,包括地质较差且地形陡峭位置的通用支架设计,利用既有结构物的支架设计,以及特殊地形放弃地基处理的支架设计。

A total of 20 cast-in-place box girder supports were designed for an expressway hub interchange in Hubei mountainous area,which have the characteristics of large construction scale and high pier column height.Due to the undulating terrain,steep mountains and thick foundation overburden in this area,the construction of cast-in-place box girder support foundation is greatly affected,and the support design is difficult.Therefore,on the basis of combing the advantages and disadvantages of conventional supports,combined with the above engineering cases,the design of cast-in-place box girder supports under different terrain conditions is analyzed and studied,including the general support design for poor geology and steep terrain,the support design by using existing structures,and the support design abandoning foundation treatment in special terrain.