End plate system for joining spun piles

An end plate system for joining spun piles together, the end plate system comprising:

• a top end plate (100) configured to be mounted at a bottom end of a first spun pile;
• a bottom end plate (200) configured to be mounted at a top end of a second spun pile;
• wherein:
• the top end plate (100) has a plurality of first segmental protrusions (110) and a plurality of first segmental recesses (120) and the bottom end plate (200) has a plurality of second segmental protrusions (210) and a plurality of second segmental recesses (220) arranged in an alternate configuration;
• each of the first segmental protrusions (110) of the top end plate (100) comprises a first radial interlocking profile (111) and a second radial interlocking profile (112), and each of the second segmental recesses (220) of the bottom end plate (200) comprises a third radial interlocking profile (211) and a fourth radial interlocking profile (212), and the radial interlocking profiles (111, 112, 211, 212) extend towards a centre of the end plates (100, 200);
• the top end plate (100) and the bottom end plate (200) are mated by registering each of the plurality of first segmental protrusions (110) of the top end plate (100) to a respective segmental recess (120) of the plurality of second segmental recesses (120) of the bottom end plate (200);
• and
• through rotating about the centre of the mated end plates (100, 200), each of the first radial interlocking profiles (111) of the top end plate (100) meets a respective third radial interlocking profile (211) of the plurality of third radial interlocking profiles of the bottom end plate (200) to form a full surface contact first interlocking joint (300), and each of the second radial interlocking profiles (112) of the top end plate (100) meets a respective fourth radial interlocking profile (212) of the plurality of fourth radial interlocking profiles of the bottom end plate (200) forming a passageway (401);
• and
• a pin (402) is configured to be inserted into the passageway (401) formed at the mating of the top end plate (100) and the bottom end plate (200), wherein:
• the pin (402) has a tapered configuration and comprises an external surface, wherein the insertion of the pin (402) into the passageway (401) causes the external surface of the pin (402) to interface with the passageway (401);
• the pin is dimensioned in a manner that the cross-sectional area of the pin (402) across its axis at a first position is greater than the cross-sectional area of the passageway (401) at a corresponding position, such that the insertion of the pin (402) into the passageway (401) results in jamming of the pin (402) in the passageway (401);
• and
• the pin (402) is dimensioned in a manner that the insertion of the pin (402) into the passageway (401) causes compression of the top end plate (100) and the bottom end plate (200) to create a post compressive force to transfer pre-stressed tendons load.