京沈客专柴河特大桥岩溶区桥梁设计与基础施工

The Design and Foundation Construction of the Chaihe Mega Bridge Through Karst Areas of the Beijing-Shenyang Passeger-Oriented Railway

介绍了京沈客运专线柴河特大桥范围岩溶发育及分布情况,提出桥梁孔跨调整绕避深大溶洞方案并根据岩溶具体情况制定基础施工岩溶处理措施。通过对各方案优缺点分析对比,采用主跨128 m连续梁大节段支架现浇方案避免深长桩施工、工期总体可控。方案施工效果良好。

Introduced in the present paper are the development and distribution of karst within the range of the Chaihe Mega Bridge of the Beijing-Shenyang Passeger-Oriented Railway,upon the basis of which put forward are the construction schemes of carrying out span layout of the bridge to avoid big and deep karst cavities,and according to the specific conditions of which cavities the karst treating measures are worked out for the construction of the foundation.Through analyzing and comparing the advantages and disadvantages of various construction schemes,it is finally decided to adopt the 128 m continuous beam as the main span and the large-segment bracket-casting-in-place scheme in order to avoid the deep and long pile construction,in which case the construction duration can be generally controlled.When the scheme is carried out,good construction effect is achieved.