Method for moving built structures by flotation

A method for moving a built structure from a first position to a second position both on a common supporting surface, which method comprises installing on the supporting surface a water-retaining enclosure to surround commonly the built structure at the first position and the second position, supplying water into the enclosure thereby to raise the built structure by flotation off the supporting surface, applying force to move the built structure in the raised state to a position immediately above the second position, and removing the water out of the enclosure thereby to cause the built structure to descend onto the second position, said enclosure comprising:

• a plurality of wall panels erected on the ground and joined edge-to-edge at their sides;
• inner and outer buttress blocks clamping therebetween the foot edges of said wall panels and anchored to the ground;
• said blocks extending along the entire wall panels;
• edge-to-edge joint means each provided between adjacent wall panels and each including leak-resisting packing means adapted to be pressed by water pressure in the enclosure against two adjoining side edges of adjacent two wall panels, and a brace strut having one end secured to an upper part of each wall panel and having another end secured to the ground outside the wall panel.