大管井降水在深水基础围堰中的应用

在松花江特大桥深水单层钢板桩围堰中,基底不设封底混凝土时,通过基底下土层的渗透系数、基坑总涌水量的计算,进行基础降水方案设计,介绍了大管井降水井设置原则、方法及施工中注意事项,较全面阐述了降水、围堰施工方案.

Application of Reducing Water Level by Big Tube Well in Deep Water Foundation Cofferdam

In deep water steel sheet pile cofferdam of the songhua river super major bridge,the foundation is not sealed by concrete at the bottom.The scheme design for decreaseing the water level is based on the caculation of the permeability coefficient of soil of the bottom of the foundation pit,on the calculation of total yield.This paper introduces principles,methods and matters needing attention in the construction for setting the big tube well to reduce the level of water and expounds water reduction m,cofferdams construction plan.