The stress state of large construction is very important and complex which is composed of residual stresses in their materials and produced stresses in their construction. Several trials have been carried out to evaluate the stresses in large constructions, but unsettled apparatus and approaching techniques prevented us from attaining the requirements of practical engineering objects.
To establish the measuring techniques and to develop some usable X-ray apparatus, the stress measurements were carried out on a large building block of a ship using X-ray method, as a trial. These experiences are reported here.