A heave tolerant pile guiding device for guiding a pile during installation thereof, the pile comprising a cylindrical section and above said cylindrical section a tapered section that narrows in upward direction, the pile guiding device comprising:
- a frame configured to be mounted to a vessel having a hull that is subject to sea-state induced motion during installation of the pile;
- at least one pair of first and second pile engaging devices arranged on the frame diametrically opposed relative to a center axis,
- wherein the first pile engaging device comprises a first pile engaging member configured to engage on an exterior of the pile during installation thereof, and a first hydraulic cylinder configured to move the first pile engaging member radially relative to the center axis, and wherein the second pile engaging device comprises a second pile engaging member configured to engage on the exterior of the pile during installation thereof, and a second hydraulic cylinder configured to move the second pile engaging member radially relative to the center axis;
- and
- a hydraulic circuit associated with the pair of first and second hydraulic cylinders,
- wherein the hydraulic system comprises a position control circuit configured to operate the pair of first and second hydraulic cylinders on the basis of position control,
- wherein the hydraulic system comprises a sphincter control circuit configured to operate the pair of first and second hydraulic cylinders when the pile engaging members engage on the tapered section of the pile,
- wherein each of the cylinders comprises a cylinder body with a head and a bottom, a piston and piston rod assembly, the piston protruding from the head of the cylinder body, a variable volume bottom chamber between the bottom and the piston, and a variable volume head chamber between the head and the piston,
- wherein the sphincter control circuit comprises:
- a first line connected to the bottom chamber of the first cylinder;
- a second line connected to the bottom chamber of the second cylinder;
- a third line connected to both the head chamber of the first cylinder and the head chamber of the second cylinder;
- a rotary flow divider having a first pump device and a second pump device on a common rotary shaft, the first pump device connected to the first line and the second pump device connected to the second line, each of the first and second pump devices being connected to the third line;
- an accumulator connected to the third line;
- and
- a valve assembly configured to selectively open and close a connection of the rotary flow divider to the first and second lines, so that, with said connection closed, the cylinders—are operated by the position control circuit,
- and so that, with said connection open, a sphincter mode of the hydraulic cylinders is established wherein the first and second hydraulic cylinders are hydraulically pressurized by the accumulator thereby urging the first and second pile engaging members against the tapered section,
- and so that, during a downward motion of the pile guiding device relative to the tapered section of the pile, the cylinder bottom chambers expel hydraulic liquid via the first and second lines, respectively, the flow divider causing an equal flow of said expelled hydraulic fluid, some of said expelled hydraulic liquid being fed via the third line to the head chambers of the first and second hydraulic cylinders and some being received by the accumulator,
- and so that, during an upward motion of the pile guiding device relative to the tapered section of the pile, the accumulator feeds hydraulic liquid via the flow divider to the bottom chambers of the first and second hydraulic cylinders, the rotary flow divider causing an equal flow of said feeds of hydraulic fluid, the head chambers expelling hydraulic liquid via said third line.