means also as before the loads that are to be transferred to the central core or to the other half part of the guiding frame are transmitted through the top and bottom plates 490 of the caisson around the central core the continuity of these plates is ensured by connector plates 350 that are bolted to the half frames after the half frames are tightened together against the central core 400 by said bolts 340 also shown are the risers 360 guiding devices 380 buoyancy tubes 420 bearing plates 355 and clamps 370 as before the guiding devices 380 comprise a u201c spring u201d part 380 a and a hard polyurethane part 380 b the caissons 480 are preferably completely closed except for holes to ensure full water ingress the holes fitted with special closing devices that do not allow water circulation in normal operation the inside may be left unpainted about 0 1 m diameter holes 405 may be made at locations where stresses are low to have access to place bolts from the inside another option is to still use bolts with the rod welded to the plate these holes could be subsequently closed using a plastic cap the plates perpendicular to the frame plane are formed as far as possible in order to reduce the number of pieces to be welded fig6 and 7 a to 7 c show an u201c open u201d type alternative to the steel guiding frame described above this frame is comprised of plates and stiffeners 530 and requires thicker plates to compensate for the lack of rigidity that is inherent in the open structure fig6 shows the frame from above and fig7 a 7.