Recent changes on qualities and quantities of cargo, passing through the Japanese domestic ports, make a tendency to use more and heavier mobilecranes as cargo handling cranes. Therefore, existing quaywalls are in danger to be subjected to heavier loads than design loads.
　Then, we try to make clear the influence on existing quaywalls, brought to with reactions of out-legs under operation. Owing to diversity of quaywalls, we cannot deal with the subject in a general procedure, but calculate individually allowable loads for a few kinds of and many sizes of quaywalls.
　In this report, we show the allowable loads for gravity type of quaywalls, anchored sheetpile walls and trestle type of piers, and methods how to calculate them.