Abstract: One embodiment of Universal Cellular Cofferdam with embedded prefabricated columnar framing (10), embedded rock anchors (16), pile cap (25), cofferdam perimeter skin (15) and granular fill (22) constitutes a hybrid cofferdam structure comprising columnar framing and cofferdam gravity cell. The described structure utilizes resisting mechanisms of structural framing, cofferdam gravity forces and mechanism of rock anchor devices for creation of unique resisting mechanism where all three resisting mechanisms compliment each other, preventing modes of structural failures typical for gravitational or columnar structures alone.

Abstract: Diaphragm Sea/Retaining Wall System consists of retaining wall that spans horizontally between Deep Beam Diaphragms anchored into bedrock through rock socketed caissons. Deep beam Diaphragm is built of two round column sections that serve as vertical chords of the Diaphragm or as flanges of the Deep beam, and of the concrete web section continuously connected to both round columns. Fixity of the Deep Beam Diaphragm at the bedrock level is provided by embedment of two round column flanges of the Diaphragm into the predrilled rock sockets or caissons. Stiffness of the Deep Beam Diaphragm support and retaining wall reinforcement arrangement allows better force distribution between system elements and makes the system of present invention a most economical solution for difficult geotechnical conditions where large forces of static and dynamic nature has to be efficiently resisted by a retaining wall system.

Abstract: Universal Framed Cofferdam has prefabricated skeletal steel space framing formed from multiple steel vertical pipes and two levels of horizontal diaphragm trusses rigidly connected to pipe columns. Beams of each diaphragm truss are attached to vertical pipes of the framing with rigid moment connections creating a rigid space frame of the perfectly round form that is used as a false work of the Cofferdam. Wales of the Cofferdam and short pieces of the flat sheet piling are attached to the vertical pipes forming a skeleton of the Cellular structure. The Skeleton of the Universal Framed Cofferdam is prefabricated in the convenience of the Dry Dock and than floated to the site. Buoyancy of the framing allows Cofferdam skeleton transportation without using the barge or otherwise necessary floating devices. Once brought to the site of installation Cofferdam skeleton is installed vertically in position and leveled on the bottom of the river bed.