In this report authors tried to show their experiment curried out in the Onahama Port Construction Office caison yard No.2, where has 2100 tons casison construction capacity, to confirm it's safety and to obtain the design data for caison yards.
　Caison traversing force, launching force and stress on the launching truck were measured in this experiment. From these measurements it was cleared that designed values were agreed pretty well with measured ones, and that the stress on the wheel-axles happened to change with the rail conditions.
　In this report theoretical caluculation on the unsteadiness of traversing force was tried also.