There is provided a method of installing spiral hangers about a messenger line installed between first and second utility poles with a cable being lashed to the messenger line with a lashing wire. The method includes attaching a first and second spiral hangers to the messenger line between first and second utility poles with the first spiral hanger disposed about the messenger line and the cable. The method includes removing the lashing wire from being around the messenger line and the cable adjacent the second spiral hanger. The method includes moving the second spiral hanger towards the second utility pole. The method includes attaching a successive spiral hanger to the messenger line between the spiral hangers and repeating the moving of the second spiral hanger and attaching another successive spiral hanger.

A low profile transport device includes a frame having a top surface and a recess disposed along the top surface to hold and transport an object. The low profile transport device also includes a plurality of wheels disposed below the frame that support the frame, and a plurality of pivotable wheel struts coupled to the wheels. The wheel struts are each individually adjustable relative to the frame from a first position relative to the frame to a second position relative to the frame to allow the low profile transport device to climb an obstacle without tilting the frame. The low profile transport device also includes a motor that generates movement of the wheels.

A low profile transport device includes a frame having a top surface and a recess disposed along the top surface to hold and transport an object. The low profile transport device also includes a plurality of wheels disposed below the frame that support the frame, and a plurality of pivotable wheel struts coupled to the wheels. The wheel struts are each individually adjustable relative to the frame from a first position relative to the frame to a second position relative to the frame to allow the low profile transport device to climb an obstacle without tilting the frame. The low profile transport device also includes a motor that generates movement of the wheels.

A foldable gantry comprising a beam and a first leg assembly, the first leg assembly being pivotally mounted at a first end of the beam such that the first leg assembly can move between a first, stowed, position and a second, deployed, position.

A foldable gantry comprising a beam and a first leg assembly, the first leg assembly being pivotally mounted at a first end of the beam such that the first leg assembly can move between a first, stowed, position and a second, deployed, position.

A portable gantry crane formed of composite members includes a composite material I-beam. Two or more support members are formed of a composite material and each support member supports the I-beam when the portable gantry crane is in an upright position. Two or more end housings are included, each end housing enclosing a top end of one of the two or more support members and coupled thereto using adhesive. A plurality of latch structures are coupled with the I-beam, each latch structure including a latch, and each end housing having a latch receiver, each latch in combination with a latch receiver allowing one of the latch structures to be releasably fixedly coupled with an end housing. In implementations a plurality of latch structures are coupled with the I-beam, each latch structure having a latch structure enclosure and each latch structure enclosure at least partially enclosing one of the end housings.

A method for hoisting and transporting assemblies in an underground nuclear power plant, the method including: 1) pouring concrete onto a reactor cavern to form a rock anchor beam; hoisting a circular bridge crane to the reactor cavern through a hoist shaft on a top of the reactor cavern; mounting the circular bridge crane on the rock anchor beam by using a truck crane; 2) installing a containment cylinder and a track beam of a polar crane in the reactor cavern using the circular bridge crane; hoisting a gantry crane on one end of a polar crane girder and sending the polar crane girder to the reactor cavern; hoisting the other end of the polar crane girder using the circular bridge crane; allowing the polar crane girder to be horizontal; and mounting the polar crane girder on the track beam.

A method for hoisting and transporting assemblies in an underground nuclear power plant, the method including: 1) pouring concrete onto a reactor cavern to form a rock anchor beam; hoisting a circular bridge crane to the reactor cavern through a hoist shaft on a top of the reactor cavern; mounting the circular bridge crane on the rock anchor beam by using a truck crane; 2) installing a containment cylinder and a track beam of a polar crane in the reactor cavern using the circular bridge crane; hoisting a gantry crane on one end of a polar crane girder and sending the polar crane girder to the reactor cavern; hoisting the other end of the polar crane girder using the circular bridge crane; allowing the polar crane girder to be horizontal; and mounting the polar crane girder on the track beam.

A portable lifting apparatus is provided. The apparatus has a modular frame comprising a first frame member and a second frame member, which in combination support a load-bearing beam having a lifting device secured thereto above a lifting surface. The first frame member, the second frame member, and the lifting device are each removably secured to the beam such that the apparatus may be disassembled into constituent components for transport or storage. Each frame member may be configured to disassemble into constituent components comprising a base and two or more support rails. The apparatus may further comprise a counterbalance. The counterbalance may serve to balance load distribution when the apparatus in use and act as a storage receptacle for the first and second frame members, the beam, and the lifting device when the apparatus is disassembled.

A method of providing position control information for controlling the movement of a spreader (400) of a crane (10) towards a spreader target position is disclosed. The method comprises measuring both the distance to the loading/unloading target position (32, 36) and the distance to a position of the spreader (400) for determining both a loading/unloading target position (32, 36) and the position of the spreader (400) in a fixed coordinate system. The method also comprises causing position control information corresponding to the position of the spreader (400) and the loading/unloading target position (32, 36) to be transmitted to the crane (10).