ABSTRACT

The gate hoist is designed to overcome the resistant forces arising during the gate movement. In general, the following forces are to be considered:

G= gate weight E=buoyancy of the submerged part Fa = friction forces on supports Fv = friction forces on seals Fh =downpull (or uplift) forces. For rotating gates (segment and flap, for example), the hoist capacity is deter-

mined by means of the torque exerted by the resistant forces about the rotation axis.