Pile driving method
AssigneeToa Harbor Works Co., Ltd.
InventorHisaharu Nakajima
Life of this patent
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Abstract
An improved pile driving method is disclosed, which is particularly applicable in piling into a hard rock bed widely in the construction of buildings, bridges, harbor facilities, piers and so forth, and in which a high-pressure water guide pipe is attached to a pile to be driven, in a manner of being movable within a certain limit, and while effecting a removal of rock pieces produced by crushing by the pile driving, through jetting a water supplied under pressure through the guide pipe, driving of the pile is worked by a vibration pile driver. This method employs a reduced amount and suppressed pressure of water to be jetted in comparison to conventional methods.
Claims12
A pile driving method capable of driving a pile into ground having a hardness N value of greater than 50, comprising mounting a water guide pipe along a pile to be driven, said water guide pipe being vertically movable relative to said pile and slidably retained next to said pile, and while crushing the rock of the piling bed by hitting at the top of the pile and removing the crushed rocks by a high pressure water sent through said water guide pipe, driving the pile into the rock bed by a vibration pile driver.
A pile driving method capable of driving a pile into ground having a hardness N value of greater than 50, comprising:
- mounting a water guide pipe along a pile to be driven, said water guide pipe being vertically movable relative to said pile and slidably retained next to said pile, said water guide pipe being extended up to 1-4 m distant from the bottom end of said pile;
- causing in an alternate manner the vertical motion of the pile generated by driving of the pile against the rock bed and repulsion of the rock bed and the vertical motion of the water guide pipe generated due to its dead weight and counteraction from jetting of water under pressure;
- removing the crushed rocks produced by driving the pile head against the rock bed through jetting a high water pressure sent through the water guide pipe in an amount within a range of 20-40 l/m and jetted under a pressure within a range of 30-60 kg/cm.sup.2 ;
- and driving the pile by a vibration pile driver.
Dependencies are inferred from the claim text.