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Anchor channels, invented by Anders Jordahl in 1913, are steel channels cast flush in reinforced concrete elements to allow the installation of channel bolts for the fastening of components. Anchor channels consist of steel C-shaped channels and anchors (mostly headed studs ) which are connected to the channel by welding or riveting/forging.
Straight, clear, smooth concrete-walled channels speed up flow, and are therefore likely to make flooding downstream worse. Modern flood control seeks to "slow the flow", and deliberately flood some low-lying areas, ideally vegetated, to act as sponges, letting them drain again as the floodwaters go down.
A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material. In the United Kingdom, the word can also be used for a longer artificially buried watercourse. [1]
Guyed tubular steel mast 385 Ice Replaced by 330 m free-standing concrete tower Orlunda, Sweden July 12, 1970: Guyed steel lattice mast 250 Lightning The base insulator was destroyed KOIN-TV Towers, Portland, Oregon: February 28, 1971: Guyed steel lattice mast 305 & 213 Ice Two towers collapsed KSTP-TV and WCCO-TV, Shoreview, Minnesota ...
For example, barriers around parking areas made of HSS are often filled, to at least bumper height, with concrete. This is an inexpensive (when replacement costs are factored in) way of adding compressive strength to the bollard, which can help prevent unsightly local denting, though it does not generally significantly increase the overall ...
It was the first precast concrete tube to be constructed, assembled from 12 large segments. The concrete tube was protected from leaks through insulation and coverings applied to the outer surface. [32] Each segment was cast at Hunters Point by CB&TC. After they were completed, the segments were sealed and the space beneath the roadway was ...
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The structural channel is not used as much in construction as symmetrical beams, in part because its bending axis is not centered on the width of the flanges. If a load is applied equally across its top, the beam will tend to twist away from the web. This may not be a weak point or problem for a particular design, but is a factor to be ...