Abstract:Given the insufficient construction technology of the early wharf pile foundation,which led to poor pile driving accuracy,the detection of original pile positions has become crucial for the reconstruction and expansion projects of high-pile wharfs.Taking the coal terminal in Luojing port area of Shanghai Port as an example,this paper conducts an in-depth analysis of the detection technology for the parameters of the dismantled and retained piles in the original wharf.In practical detection,unmanned aerial vehicle (UAV) equipped with a laser radar and unmanned ships equipped with multi-beam system are used to detect the underwater pile positions.Total stations are employed to measure the pile positions of the retained parts of the wharf.By combining modeling,measurement,and calculation methods,the pile position information is accurately obtained.The research concludes that the reconstruction projects of wharfs with a long construction history,the original pile position detection and analysis should be carried out to support the layout of new pile positions.After large-scale demolition,UAVs and unmanned ships offer fast detection rates and high precision.The undemolished wharf deck and equipment cause significant interference and low precision in underwater detection.Data on retained piles can be measured using a total station,which may have low efficiency but high precision after correction.These conclusions provide a reliable basis for the design of new pile positions in wharf reconstruction and expansion projects at their original sites.
