Abstract: A trench box including a first plate to support a first side of a trench, a second plate to support a second side of a trench, and spreader bars extending between the first and second plates. One or both of the first and second plates is assembled from a plurality of modular panels arranged in a same plane and detachably secured to one another by a plurality of connectors and fasteners. A panel may be removed from one of the first plate and/or the second plate when an obstacle is encountered in the ground that runs across the trench. The removal of the panel creates an opening in the trench box to accommodate the obstacle without compromising the structural integrity of the trench box. Removal of the panel also does not negatively impact the trench box's ability to prevent collapse of the sides of the trench into the trench.

Abstract: A jib crane that includes an open column having a first end and a second end opposite to the first end that is adapted to operably engage with a ground surface. The jib crane also includes at least one interior space collectively defined by the open column between the first end and the second end. The jib crane also includes a crane beam operably engaged with the open column at the second end of the open column. The jib crane also includes a bearing assembly operably engaged with the crane beam and the open column, and the bearing assembly has at least one bearing positioned inside of the at least one interior space defined by the open column.

Abstract: A davit crane that includes a base adapted to operably engage with a ground surface. The davit crane also includes a drive assembly operably engaged with the base. The davit crane also includes an actuation assembly operably engaged with the drive assembly, wherein the actuation assembly is configured to move between a lowered position and a raised position via the drive assembly. The davit crane also includes a boom assembly operably engaged with the actuation assembly. The actuation assembly of the davit crane is operable to pivotably adjust the boom assembly between the raised position and the lowered position.

Abstract: A slew bearing that includes an inner ring. The slew bearing also includes a first outer ring positioned about a first portion of the inner ring. The slew bearing also includes a second outer ring operably engaged with the first outer ring, wherein the second outer ring is positioned about a second portion of the inner ring opposite to the first outer ring. The slew bearing also includes at least one set of ball operably engaged with the inner ring and one or both of the first outer ring and the second outer ring. The inner ring of the slew bearing is configured to rotate about the first outer ring and the second outer ring.

Abstract: A jib crane assembly having a vertical pole and a boom for lifting a load. The pole has a length and cylindrical outer surface. A pivot structure is arranged at an upper segment of the pole such that the boom is rotatably secured at a pivot point, thereby dividing the boom into first and second portions. A compression support extends from the first portion of the boom to a compression roller engagement assembly, and a tension roller engagement assembly is secured to the second portion of the boom, opposite the compression roller assembly. The tension roller assembly is attached to a tension frame, wherein said compression support, compression roller assembly, tension frame, and second portion of the boom provide structural support and counter-balance when lifting the load, and the pivot structure and roller assemblies facilitate rotation of the load around the pole.

Abstract: A jib crane assembly having a vertical pole and a boom for lifting a load. The pole has a length and cylindrical outer surface. A pivot structure is arranged at an upper segment of the pole such that the boom is rotatably secured at a pivot point, thereby dividing the boom into first and second portions. A compression support extends from the first portion of the boom to a compression roller engagement assembly, and a tension roller engagement assembly is secured to the second portion of the boom, opposite the compression roller assembly. The tension roller assembly is attached to a tension frame, wherein said compression support, compression roller assembly, tension frame, and second portion of the boom provide structural support and counter-balance when lifting the load, and the pivot structure and roller assemblies facilitate rotation of the load around the pole.

Abstract: An anchoring system to secure a mounting plate at a base of a pole or column to a concrete foundation includes a plurality of base plates. Each base plate has a planar surface, center-point, and plurality of fastener openings spaced about the center-point. A plurality of concrete anchoring fasteners having a common cross-sectional diameter secures each base plate to the foundation. An attachment bolt at the center-point of each base plate extends perpendicular to the planar surface for securing through an attachment bolt opening inside a peripheral edge of the mounting plate. The anchoring fasteners for securing the base plates to the foundation are spaced apart no less than ten times the common cross-sectional diameter.

Abstract: Structural members widely adaptable for use to build various composite structures and assemblies having horizontal and vertical supports, such as columns, beams and rails, are shown and described. The composite structural members include a longitudinal channel having a web and first and second legs. Each leg includes a plane that extends from a side of the web and is inclined relative to the web, and a cylinder is located at an edge of the leg that is spaced from the web. Various fittings can be used to engage at least one of the cylinders of the channel to fix the channel in position relative to a second, third and/or fourth channel to form the column, beam or rail. Further, select brackets can be used to attach together columns, beams and rails of the assembly.

Abstract: Structural members widely adaptable for use to build various composite structures and assemblies having horizontal and vertical supports, such as columns, beams and rails, are shown and described. The composite structural members include a longitudinal channel having a web and first and second legs. Each leg includes a plane that extends from a side of the web and is inclined relative to the web, and a cylinder is located at an edge of the leg that is spaced from the web. Various fittings can be used to engage at least one of the cylinders of the channel to fix the channel in position relative to a second, third and/or fourth channel to form the column, beam or rail. Further, select brackets can be used to attach together columns, beams and rails of the assembly.