Abstract: A scaffolding structure for mounting to a supporting structure such as a bridge includes a track fixable to the supporting structure, and a frame. The frame and track are movable relative to one another, and the frame is also movable relative to the supporting structure between a first position and a second position. In the first position, the track supports the frame, and the track is supported by the supporting structure, so that when the track is fixed to the supporting structure, the frame can advance along the track and therefore along the supporting structure. In the second position, the frame is supported by the supporting structure and the track is supported by the frame, so that the track can advance along the supporting structure. By alternately advancing the frame and the track, the scaffolding structure can advance along the entire length of the supporting structure.

Abstract: This invention relates to a method of resurfacing an ice surface to reduce friction between the ice and an object gliding on the ice surface. The steps comprise mixing an effective amount of lubricant with water, coating the ice surface with the mixture, and allowing the mixture to freeze to form a new ice surface. In particular, the lubricant is derived from siloxane. In the preferred embodiment, the lubricant is a composition derived from polydimethysiloxane and copolyolamine. In the preferred embodiment, the ratio of water mixed with the lubricant is 300:1. This invention also provides for the use of the composition as an agent to reduce friction between an ice surface and an object gliding on the ice surface. In particular, an effective amount of the composition is mixed with water prior to applying the mixture to a surface upon which the ice surface is to form.

Abstract: A work station is disclosed comprising: an envelope (20) having a top section (30), a bottom section (31), first (32) and second (33) end sections, and first (34) and second (35) side sections to shelter workers and to contain debris, each section being suspended between a supply means and a take-up means on a plurality of support means (63) about a structure that are mounted in a first motive means (21) on the structure to permit the envelope to be repositioned from time to time, scaffolding means (80-81) suspended by cables on a second motive means to permit a vertical degree of freedom and on a third motive means on a transverse beam (84) for a lateral degree of freedom, each beam being mounted on a fourth motive means on the support means to permit a longitudinal degree of freedom of movement.