An apparatus including a support; a first upper frame and a second upper frame each attached to the support; and removable actuators extending vertically from a base and located below the support and between the first and second upper frames, wherein the actuators are vertically extendable and retractable; wherein the actuators are adapted to engage the support and raise or lower the support upon the extension or retraction of each actuator; wherein the actuators are adapted to extend to a first height at which a first middle frame may be arranged below the first upper frame and a second middle frame may be arranged below the second upper frame; and wherein the actuators are adapted to retract to a second height at which the first middle frame may be attached to the first upper frame and the second middle frame may be attached to the second upper frame.

A utility tower lifting apparatus and method for raising a lattice tower in addition to carried transmission cables without disturbing the tower foundation, disconnecting the cables, or requiring de-energization of the transmission lines.

A crane system includes a structural truss positioned within a central opening defined by an inside surface of an annular tower, a crane mast connected to an outside surface of the annular tower, and a jib arm connected to the crane mast.

An automatic mast section latching system is disclosed that provides rapid and safe connection of sequential mast sections without placing an employee in a lift to complete the task. A slot flange extends above each mast section for connecting to a pin section extending below a mast section above it. A first pin and a second pin extend perpendicularly from each pin flange. A slot is formed on the slot flange for receiving the first pin. A ramp is formed on the top of the slot flange. A seat is formed on the ramp for receiving the second pin.

A method of assembling a land-based rig is provided, which includes providing a set of modules that can be assembled together to form the rig, wherein the modules include an on-board crane, and assembling the modules into the rig, wherein at least some of the modules are assembled into the rig using the on-board crane.

A method of assembling a land-based rig is provided, which includes providing a set of modules that can be assembled together to form the rig, wherein the modules include an on-board crane, and assembling the modules into the rig, wherein at least some of the modules are assembled into the rig using the on-board crane.

A precast pole foundation having an elongated concrete body having an upper surface and a lower surface. At least two parallel concrete bolts extend from the upper surface of the concrete body. At least one cavity is disposed along the body of the concrete body for receiving a conduit. The pole foundation is preferably cylindrical and can be used to support a light pole, a utility pole, a sign pole of any such structure. At least a portion of the concrete body is reinforced with at least one reinforcing bar embedded therein.

A structural tower for a wind turbine assembly, includes along at least a base section: a plurality of peripheral sections extending peripherally of a central section. Each includes a convex-shaped wall having two longitudinal side edges and an inner framework connected to a respective one of the convex-shaped walls and extending inwardly therein. The inner framework includes spaced-apart transversal structural members connecting the two longitudinal side edges of the convex-shaped walls together and pairs of connecting structural members extending inwardly towards the central section. Each connecting structural member of a pair has a peripheral end connected to a respective one of the longitudinal side edges and an inner end connected to an inner end of a respective one of the connecting structural members of an adjacent one of the peripheral sections to define a structural concavity in the structural tower between adjacent peripheral sections.

A structural tower for a wind turbine assembly, includes along at least a base section: a plurality of peripheral sections extending peripherally of a central section. Each includes a convex-shaped wall having two longitudinal side edges and an inner framework connected to a respective one of the convex-shaped walls and extending inwardly therein. The inner framework includes spaced-apart transversal structural members connecting the two longitudinal side edges of the convex-shaped walls together and pairs of connecting structural members extending inwardly towards the central section. Each connecting structural member of a pair has a peripheral end connected to a respective one of the longitudinal side edges and an inner end connected to an inner end of a respective one of the connecting structural members of an adjacent one of the peripheral sections to define a structural concavity in the structural tower between adjacent peripheral sections.

The present invention relates to a method for the assembly of frustoconical concrete towers comprising a step of placing and positioning of at least one subset of a tower section formed by at least two segments in an area close to the base of the tower, a step of assembling the subset of the tower section by attaching at least two segments, so that the assembled subset is freestanding and a step of stacking the assembled subset onto an immediately lower tower section.