Patent ID: 9732493
Date: 2017-08-15
CPC Classifications: E02D

Claim:
1. A method for attenuating water pressure pulses generated during sea piling when a percussion mechanism is used, the sea piling comprising a stage of driving at least one pile into an earth formation at the bottom of a sea or lake by means of the percussion mechanism, the pile having an axial extension defining a longitudinal axis and having an outer periphery, a part of the axial extension being submerged under sea or lake water along an entirety of said part of the axial extension, the method comprising the steps of: surrounding the pile, along at least a section of said submerged part of the axial extension with a tubular outer sleeve, the outer sleeve having an inner periphery and extending in an axial direction of the pile; and using a gas introduction system to provide, at least partially along said section of said submerged part of the axial extension, one gas-filled space or a plurality of gas-filled spaces between the inner periphery of the outer sleeve and the outer periphery of the pile; wherein the step of using a gas introduction system to provide one gas-filled space or a plurality of gas-filled spaces comprises pushing water present between the inner periphery of the outer sleeve and the outer periphery of the pile out through an outlet in the outer sleeve.