Abstract: A system for forming a vertical structure through the incremental pouring of wet concrete has a plurality of vertical columns external to the concrete of the vertical structure; a slip form structure comprising a pair of opposing walls forming a bottomless trough; a main frame coupled to the slip form structure, wherein the main frame is supported on, and configured to move vertically along, the vertical columns; and a work platform residing below the slip form structure and main frame, the work platform being supported on, and configured to move vertically along, the vertical columns; wherein the main platform moves independently of the work platform.

Abstract: A system for forming a vertical structure through the incremental pouring of wet concrete has a plurality of vertical columns external to the concrete of the vertical structure; a slip form structure comprising a pair of opposing walls forming a bottomless trough; a main frame coupled to the slip form structure, wherein the main frame is supported on, and configured to move vertically along, the vertical columns; and a work platform residing below the slip form structure and main frame, the work platform being supported on, and configured to move vertically along, the vertical columns; wherein the main platform moves independently of the work platform.

Abstract: A portable tank is described herein. An assembled tank features an upper ring and a lower ring. The upper ring comprises a series of arcuate upper panels coupled together to form the upper ring. The lower ring comprises a series of arcuate lower panels coupled together to form the lower ring. The upper and lower panels are coupled together using T-shaped coupling configurations. Upper panels are secured to corresponding lower panels using jaw connectors.