Abstract: A kit for installing a boat dock to an underlying bed of a body of water includes a deck frame for supporting a deck surface and guide members configured to slideably engage a support pillar to the deck frame; dock flotation members for floating the deck frame on the body of water; and pillars configured to be engaged to the deck frame by the guide member and to be anchored to the bed to secure the deck frame to the bed. A deck panel consists of an external frame with a reinforced concrete panel within the frame and a method for assembling and installing a dock, supporting a deck frame on or above a body of water; inserting pillars through guide members on the frame to contact the underlying lake bed; and anchoring the pillars to the underlying bed.

Abstract: The invention relates to a modular system for assembling a hollow structure. The system comprises segments for assembly into modules to assemble hollow structures such as culverts and water-retention systems. The segments comprise opposing sidewalls and a deck spanning said sidewalls having opposing sides and opposing ends which are assembled in inverted, vertically aligned relation to each other to form a hollow module. The segments engage each other with mutually engaging three dimensional structures that prevent lateral and vertical slippage between the segments. The segments may include half-columns that meet along the plane of engagement to form full-height load bearing columns in the assembled structure.