Pile driving system and pile for engagement with said system

1. A system for controlling pile orientation comprising: a pile; and a pile guide for supporting the pile as it is driven into a substrate, comprising a base frame and a pile guide member mounted on the base frame, the pile and pile guide member having slidably interengagable profiles comprising first and second parts which are configured to axially rotate the pile to correct any mis-orientation relative to the pile guide as the parts slide past each other; characterized in that the interengaging profiles further comprise third and fourth parts which are configured to maintain a predetermined orientation of the pile relative to the pile guide once any mis-orientation has been corrected by interengagement of the first and second parts.

2. A system according to claim 1 , in which the third and fourth parts are configured to engage each other before the first and second parts slide past and disengage each other.

3. A system according to claim 1 , in which the third and fourth parts comprise a plate-like member and a channel in which the plate-like member is a sliding fit.

4. A system according to claim 3 , in which the plate-like member is mounted on the pile, and the channel is provided on an inner periphery of the pile guide member.

5. A system according to claim 3 , in which the channel has an upper flared opening for first receiving the plate-like member as the pile is lowered through the pile guide.

6. A system according to claim 1 , in which the channel further comprises a lower flared opening for re-engaging the plate-like member if the pile rises up through the pile guide.

7. A system according to claim 3 , in which the channel is formed between a pair of spacer plates, the spacer plates being configured to center the pile in the pile guide member.

8. A system according to claim 1 , in which the first and second parts comprise an orientation plate and a guide plate system defining a helical pathway for the orientation plate.

9. A system according to claim 8 , in which the orientation plate is mounted on the pile, and the guide plate system is provided on an inner periphery of the pile guide member.

10. A system according to claim 8 , in which the guide plate system defines a pair of helical pathways of opposite senses of rotation, which define a tapering channel therebetween for correcting any mis-orientation in the pile.

11. A system according to claim 10 , in which the tapering channel has a flared portion at its lower end for re-capturing the orientation plate should the pile move upwards relative to the pile guide after the first and second parts have slid past each other.

12. A pile for driving into a substrate, the pile comprising:

an elongate body with a leading end and a trailing end;

a coupling for receiving a tether, the coupling being located towards the trailing end;

a first member projecting radially outwardly from the body, the first member being located towards the leading end; and

a second member projecting radially outwardly from the body, with the second member being axially spaced towards the trailing end from the first member, and with the first and second members being configured to engage a pile guide and to orientate the pile in dependence on engagement with the pile guide.

13. A pile according to claim 12 , in which the coupling is angularly offset relative to at least one member.

14. A pile according to claim 12 , in which the first and second members are angularly aligned.

15. A pile according to claim 12 , in which the first member is plate-like and defines a plane with the plane of the first member being parallel to a longitudinal axis of the body.

16. A pile according to claim 12 , in which the second member is plate-like and defines a plane, with the plane of the second member being parallel to a longitudinal axis of the body.