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An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments. An overhead crane consists of two parallel rails seated on longitudinal I-beams attached to opposite steel columns by means of brackets .
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.
Bethlehem Steel, headquartered in Bethlehem, Pennsylvania, was a leading supplier of rolled structural steel of various cross-sections in American bridge and skyscraper work of the mid-20th century. [3] Rolled cross-sections now have been partially displaced in such work by fabricated cross-sections.
In the 1830s Robert L. Stevens invented the flanged 'tee' rail (actually a distorted I beam), which had a flat bottom and required no chair; a similar design was the contemporary bridge rail (of inverted U section with a bottom flange and laid on longitudinal sleepers); these rails were initially nailed directly to the sleeper. [4]
A girder bridge is a bridge that uses girders as the means of supporting its deck. [1] The two most common types of modern steel girder bridges are plate and box. [citation needed] The term "girder" is often used interchangeably with "beam" in reference to bridge design.
Note the collapsed spans of the old (nearest) bridge. artificial islands built with sand and rock core that is protected by riprap. The islands are quite effective in protecting the pier by pushing the ship away, but cause environmental damage to the river bottom and, while settling, might shift the bridge piers; [8]
In a plate girder bridge, the plate girders are typically I-beams made up from separate structural steel plates (rather than rolled as a single cross-section), which are welded or, in older bridges, bolted or riveted together to form the vertical web and horizontal flanges of the beam. In some cases, the plate girders may be formed in a Z-shape ...
Gien Bridge (Loiret, France) – Masonry piers, protected downstream here by backwaters. In masonry bridge piers, there is a resistant part and a filling part: [6] The periphery of the shafts over a certain thickness constitutes the resistant part, made of dressed stones in the angles and squared or even rough stones.
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