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An anchor portal or H-frame tower is a gantry structure supporting overhead power lines in a switchyard. Their static function is similar to a dead-end tower . Anchor portals are almost always steel -tube or steel-framework constructions.
The aluminum H-frame gave the Workmate a very distinctive appearance and was considered to be "Hickman's greatest aesthetic stroke." [3] By the Type 6, the aluminum H-frames were replaced by ones of stamped steel. [4] Black & Decker have since sold 30 million Workmates (2011). [5]
Scaffolding for rehabilitation in Madrid, Spain [1] Scaffolding for renovation on the Virgin Mary statue, Santiago de Chile, Chile.. Scaffolding, also called scaffold or staging, [2] is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other human-made structures.
A gallows (or less precisely scaffold) is a frame or elevated beam, typically wooden, from which objects can be suspended or "weighed". Gallows were thus widely used to suspend public weighing scales for large and heavy objects such as sacks of grain or minerals, usually positioned in markets or toll gates.
Braced frame construction, also known as full frame, half frame, [6] New England braced frame, [7] combination frame [8] an early form of light framing which survived into the 1940s in the northeastern United States, [9] defined by the continued use of girts, corner posts, and braces, most often mortised, tenoned, and pegged with nailed studs. [8]
Because of the limited height of available trees, the maximum height of wooden pylons is limited to approximately 30 m (98 ft). Wood is rarely used for lattice framework. Instead, they are used to build multi-pole structures, such as H-frame and K-frame structures.
The steel-frame technique was familiar to the Fuller Company, a contracting firm with considerable expertise in building such tall structures. [252] The Flatiron Building's construction was relatively easy because it used a steel frame; its 22-story height would have been difficult using other construction methods of that time. [ 253 ]
The ladder itself is capable of being converted into several heights and configurations from a single ladder. Configurations include a straight or extension ladder, an A-frame ladder, a staircase ladder (an uneven A-frame for use on stairs), a 90° ladder, and both sides of a scaffolding trestle achieved through a triple locking hinge.
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