Adequate drain holes should be provided to avoid any entrapment of water, which could lead to
corrosion damage.
Steel chocks or pourable res in compound may be fined between the foundation and the machinery
bed plate. Resin cbocks should be of uitable and proven material.
If steel chock are used. an area on the foundation lOP plate !Day require machining.If resin chocks are fitted, Ihe lOp p la te should be sized taking inlO accoull! the ne.cessily of filling
dams to retain the resin.
The surfaces where resin chocks are to be used should be cleaned and the hold-down bolt torque
should not exceed the resin chock supplier's recommendation.
Brake anchors should be designed to meet the design criteria given in Section 4. For loads in excess
of about 100 tonnes (981 kN), the brake anchors should preferably be carried Ihrough Ihe deck;
alternatively, brake anchors can be welded to the foundation with adequate toe brackets in line
with deck stifreners. Welding should be fuU penetration type. Local deck insert plates may also be
necessary.An abutment or end stopper may be \Iielded to the foundation at points predetermined by the
machinery manufacturer to reduce the hold-dowo boil's shear loading and to reduce the need for
filled bolts.Foundations of all winches of greater tban five tonnes rated pull may require to have abulments
filled.An underdeck support structure should be provided in line with t.he foundation above the deck. For
winche· in the mid-body area. the suppon ~hould preferably be in a transverse direction and be of
adequate size and span to distribute the load into existing deck 10ngitudinaJs. Rein forcemenL of
existing longitudinals should be avoided if at all possible 10 prevent fatigue crac king at the ends of
reinforcements.Where tension loads are applied to the deck. it may be necessary for welding above and below the
deck to be of the full penetration type. Other type weld sizes should be checked for adequacy.
Where foundation members line up witb existing deck structure, the standard weld size of deck
longitudinals, beams or transverse webs may also have (0 be increased.5.3 CHOCKS AND FAIRLEADS
Chocks and fairleads arc often welded directly to tbe hull structure. The outer faces of chocks and
fairleads located in tbe bow and stcrn areas should bu\( directly into the bell plaling (or a shcll
plate insen if the shell plate is of insufficient thickness). In the mid-bod~ 1 area, any welding to the
sbeer stIake or the roundt:d gunnel plate should be avoided if possible .. A proper connection can be
achieved with a cant ilevered foundation as shown in Figs. 5.1 and 5.2 .. The foundation should be
sized so that the two longitud inal members line up with deck 10ngitlldinals. Additional t.ransverse
reinforcing members below the deck may also be required to spread the load over additional deck
and sheIJ 10ngilUdinals. The e nds of longirudinal foundation members should have well-radiused
connections to reduce stress concentrations in the upper deck.The installation of some universal fairleads, such as the one shown in Fig. 5.3, require s pecial at·
tention, since the supporting structure must not ollly absorb the overall reac tions from a mooring
line load, but also the reactjons of the two individual end frames. The preferred design is a fair lead
wirh a substantial bottom member that connects the two end frames. The benefits in reduced deck
reaction forces and lesser reinf orcement requirements are sbown in Fig. S.4.