Application of Steel Tube-drill Cutting Method in Steel Pipe Pile-foundation Construction of a Sea-crossing Bridge in Bare Rock Area

In the construction of a sea-crossing bridge, the embedded steel pipe piles of the seabed are mostly adopted for the steel pier foundation. But when there is no silt overburden, seabed is of very hard bare rock. And so, using vibration-hammer moving to steel pipe pile vibration inserted into the seabed is not available. For this special condition, a new method of construction should be developed. The method is combing the vibratory hammer, drill pipe and pump as a working system, first forming an annular pile hole, and then implanting steel pipe pile into the hole. Practical examples prove that the method of construction is of high efficiency and reliable quality.