不平衡受力条件下基坑支护关键施工技术

Key technology for the construction of foundation pit support under unbalanced force condition

分析了京台高速公路齐河至济南段改扩建工程黄河大桥主桥P3#墩施工基坑支护变形和受力情况,经方案比选,采用“锁扣钢管桩作为基坑支护+钻孔灌注桩加固防护”的施工方法,并对施工关键技术进行了优化,较好地解决了钢管桩在不平衡受力条件下施工难题。

After analyzing the deformation and force situation of pit support for the main bridge P3#pier of Yellow River Bridge in the reconstruction and expansion project of Beijing-Taipei expressway from Qihe to Jinan,the construction method of"locking steel pipe piles as pit support+drilled piles for reinforcement and protection"is adopted through the selection of schemes and the key construction techniques are optimized,which can solve the construction problems of steel pipe piles under the condition of unbalanced force better.The key construction techniques were optimized,which better solved the construction problems of steel pipe piles under unbalanced stress conditions.