关键词: 深基坑, 支护方案, 支护结构计算, 围檩计算

Abstract: Considering the deep foundation pit depth, geological condition, surrounding environment and construction period of Baiyin Yellow River Bridge, the supporting scheme of larsen steel plate foundation pit is scientifically selected. The construction scheme of drainage excavation, bottom sealing and then removing the bottom enclosing purlin structure reduces the bottom sealing thickness and ensures the one-time overall pouring of the cap. The calculation of the support structure with lizheng professional pit software shows that the stress, displacement and anti-uplift of the main support structure all meet the requirements. In addition, the calculation results of enclosing purlin structure by Midas software also meet the requirements. The construction practice shows that the measured deformation value of steel sheet pile is close to the theoretical calculation value, which fully shows that the calculated results are in good agreement with the actual engineering, and the simulation calculation can be used to guide the construction, providing a successful case for the bridge deep foundation pit supporting engineering with similar geological conditions and limited time limit.

Key words: deep foundation pit, support scheme, support structure calculation, enclosing purlin calculation