重力式老码头前沿PHC桩沉桩施工的影响

坦桑尼亚某水工改扩建工程的1#~3#泊位原结构为重力式方块码头,新建外扩部分为宽11.54 m的墩式结构。对1#和2#泊位PHC桩打桩过程原重力式方块码头的位移进行监控,并总结出沉桩规律。结果表明,将重力式方块海侧珊瑚礁石垫层疏浚后施打PHC桩,对原重力式码头结构的位移影响较大,码头面及附近建筑物地面均出现了裂缝;打桩过程中,方块不同结构形式交界面的水平位移最大;采用外凸型十字桩尖桩靴,PHC桩穿透性能最强,原码头方块结构水平位移最小,码头更稳定。

Influence of PHC pile sinking construction in front of old gravity wharf

The original structure of 1#to 3#berths of a hydraulic reconstruction and expansion project in Tanzania is a gravity block,and the new-build expansion part is a pier structure with 11.54 m width.We carry out the displacement monitoring of the old gravity square block of 1#and 2#berths in the PHC pile driving process and summarize the pile sinking laws.The results show that after dredging the coral reef cushion under the gravity block,the PHC pile is driven,and the displacement of the original gravity wharf structure has a greater impact,and cracks appear on the old wharf surface and nearby buildings ground.During the pile driving process,the horizontal displacement of the interface between the different structural forms of the block is the largest.With the outer convex cross-tip pile boots,the PHC pile has the strongest penetration performance,the original horizontal displacement of the square structure of the dock is minimum,and the dock is more stable.