Abstract: A soil tight bin-type retaining wall is formed having cementitious panels as the exposed walls including the front wall. Each end portion of the front face of each cementitious panel contacts against a flange portion of a connector positioned in the plane of the front wall to support the cementitious panel in a substantially erect position. An angle member is positioned on a web portion of a connector to retain the cementitious panel of the front wall in a substantially erect position. A plurality of stringers form the rear wall by being supported by the connectors positioned in the plane of the rear wall. A plurality of spacer members form the side walls by being supported by the web portions of a pair of connectors. In alternative embodiments, the retaining wall may be constructed so that the direction of the front or rear wall changes. Additionally, a retaining wall may be formed in which some or all of the front, rear or side walls are composed of cementitious panels.

Abstract: A segmented cylindrical reinforced plastic manhole structure comprising a cylindrical body surmounted by a transition element. The transition element is adapted to support a conventional manhole cover and frame assembly and has an opening closable by the manhole cover. The manhole structure body comprises a plurality of curved, nestable segments of cast or molded reinforced plastic material. Each segment is provided with vertical side edges configured to provide an interlocking joint between it and an adjacent segment and the segments may be so sized as to require two, three or more segments to complete the circumference of the manhole structure body. Each segment is provided with horizontal top and bottom edges configured to provide an interlocking joint between it and an adjacent segment thereabove or therebelow so that the segments may be arranged in tiers to provide a manhole structure body of desired height.