Abstract: A method for explosively forming tubular copper molds of the type employed in continuous casting of steel billet and bloom sections.

Abstract: A sectionalized structure of preformed wall panels especially adapted for use as base for burial in the earth for mounting above-ground electrical equipment such as sectionalizing cabinets, transformers, electrical switch gear boxes, and similar equipment connected to underground utility cables. The base is preferably formed from precast concrete modular form panels which are adapted for assembly at the installation site. The wall members terminate in beveled vertical edges which abut to form mitered corners. Clamping fastening means engaging the mitered corners secure the base wall panels in rigid geometrical configuration.