(57) The invention concerns a locking assurance construction in an extension joint for
precast reinforced concrete piles. The first reinforced concrete pile (P1) and the
second reinforced concrete pile (P2) have, at their interconnectible ends (11, 12),
lock housings (2a) provided with transverse holes (3a), and lock spindles (2b) provided
with transverse holes (3b). The lock housings and lock spindles extend one within
the other with said transverse holes in line with each other. Said locking assurance
construction comprises a locking ring (4) in each internal extension (13) of the transverse
holes (3a) in the lock housings (2a). Said locking ring has between its outer diameter
(D1) and inner diameter (D2) a continuous peripheral segment (5), and between the
inner diameter (D2) and the bore diameter (D3) of a central aperture (15), spring
tabs (6) separated from each other by radial slots (9). Said locking assurance construction
also comprises in the insert pins (16), a cylindrical or cross-sectionally polygonal
inner end (7), having an engagement diameter (D4) which is less than the locking ring's
inner diameter (D2) and more than the locking ring's bore diameter (D3).
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