基于钢桩定位抓斗船平台的水下振冲碎石桩施工技术

Construction technology of underwater vibroflotation piles based on grab dredger platform with spud positioning

针对波浪条件下传统的平板驳船和履带吊车配合振冲碎石桩施工桩位偏差大、时利率低、安全隐患高等问题,通过船舶改造、改进振冲设备、优化施工工艺,结合唐山港某防波堤堤头改造工程,提出一种钢桩定位抓斗船改装、送料振冲一体水下振冲碎石桩施工技术方案并验证其可行性。结果表明,该方案满足施工安全性、桩位精度等要求,在类似工况下具有推广价值。通过模块化的改装,拓展了船舶应用范围,提高了成桩质量及波浪条件下的时利率,节约了工程成本。

In the construction of vibroflotation piles with traditional flat barges and crawler cranes under wave conditions,there are problems of large pile position deviation,low hourly interest rate,and high potential safety hazards.Therefore,this paper proposes a technical scheme for underwater vibroflotation pile construction featuring grab dredger reconstruction with spud positioning and feed vibroflotation by transforming the dredger,improving vibroflotation equipment,and optimizing construction technology in a breakwater head transformation project in Tangshan Port,and the feasibility of the scheme is verified.The results show that the scheme meets the requirements of construction safety and pile position accuracy,and it is worth popularizing under similar working conditions.Through modular reconstruction,the application scope of the dredge is expanded.The pile quality and hourly interest rate under wave conditions are improved,and the project cost is saved.