深厚淤泥层超长大直径桩基钢护筒施工测量控制技术分析

Analysis on Construction Measurement and Control Technology of Steel Casing for Long-length Large-diameter Pile Foundation in Deep Silt Layer

摘要:

浙江温州新建永宁大桥位于飞云江下游入海口段，水域部分地质以淤泥质黏土为主，河床以下30 m为淤泥不良地质。由于深厚淤泥层对主墩超长大直径桩基钢护筒施工带来巨大困难，为克服江水流速快、定位困难、钢护筒稳定性差等问题，通过对超长大直径桩基钢护筒施工测量控制技术进行分析，采用相应测量控制技术，能保证钢护筒精准沉桩。

Abstract:

Yongning Bridge newly built in Wenzhou City of Zhejiang Province is located at the estuary in the lower reaches of Feiyun River. The part of the geology of the water area is mainly silt clay, and the geology 30 m below the river bed is poor silt. Due to the great difficulties to the construction of the steel casing for the super-long large-diameter pile foundation of the main pier brought by the deep silt layer, in order to overcome the problems of fast river water velocity, difficult location and poor steel casing stability, the analysis is carried out for the construction measurement and control technology of steel casing for super-long large-diameter pile foundation, and the relevant measurement and control technology is adopted, which can guarantee the precise pile sinking of steel casing.