Patent ID: 8230940
Filing Date: 2012-07-31
Classification: E02D

Abstract:
1. A method for driving a support into a ground surface by means of a pile-driving device comprising a cylinder, an anvil for transmitting a striking motion to the support, which anvil closes a lower side of the cylinder at least substantially, a ram which is capable of reciprocating movement as a piston above the anvil within the cylinder, and an injection device for injecting fuel under pressure into a combustion chamber defined by the cylinder wall, the anvil and the ram, comprising the steps of: a) causing the ram to move downward, b) injecting fuel into the combustion chamber, c) causing the fuel to combust so as to generate an elevated pressure in the combustion chamber for driving the ram upward as a result of said elevated pressure after the ram has struck the anvil, in such a manner that said combustion occurs before the ram strikes the anvil, wherein the moment of fuel injection and/or the amount of fuel to be injected is/are adjusted in dependence on at least one variable.