| 摘要 |
Underwater pile driving is implemented by a pile-driving apparatus 14 releasably coupled to a guide sleeve 5 secured to the top of a pile 10. The assembly may be performed on the surface vessel 1 through an opening 4 in a laterally extending platform 2 with the aid of a crane 13, or underwater. The components are lowered on guide cables 8, 9, and after the driving operation is completed, the coupled apparatus 14 and sleeve 5 are raised together. The striking plate 22 for the pile-driving hammer is carried by the apparatus 14.
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