气动潜孔锤在港口超厚抛石层中引孔沉桩的应用

Application of pneumatic DTH hammer in pile-sinking by guiding hole of ultra-thick riprap layer in port engineering

气动潜孔锤钻孔具有施工速度快、功效高、质量可靠、性价比高,以及设备占地面积小、绿色环保无泥浆等特点,尤其适用于在超厚岩层的区域钻孔,但在港口工程领域应用较少。某石化码头工程引堤管架基础工程采用传统的冲孔灌注桩方案,施工效率非常低,无法如期保质完成。创新性地引入长螺旋气动潜孔锤辅助PHC桩沉桩的施工工艺,将原来的29个月施工时间缩短为2.5个月,极大提高了沉桩效率,满足工程总体进度要求;同时降低材料费、施工费,有效解决了工程难题,保证工程顺利按期完工。

Pneumatic DTH(down the hole)hammer drilling has the characteristics of fast construction speed,high efficiency,reliable quality,high cost-effectiveness,small equipment footprint and green environmental protection without mud,especially suitable for drilling in areas with ultra-thick riprap layer,but it is less applied in the field of port engineering.The pipe rack foundation project on an embankment of a petrochemical terminal in a port project used the traditional punching and cast-in-situ pile scheme,which has very low construction efficiency and could not be completed as scheduled with quality.The construction process with long spiral pneumatic DTH hammer assisted PHC pile sinking is introduced innovatively,which greatly improves the efficiency of pile sinking,shortens the original 29 months construction time to 2.5 months,and ensures timely completion to meet the overall project schedule requirement.Simultaneously the technology reduces material and construction costs,and effectively solves engineering problems,ensuring smooth and timely completion of projects.