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A 2008 incident involving a scaffold collapse 47 floors over Manhattan, which occurred only months after Tractel repaired the faulty equipment, resulted in the death of one of two window washers ...
The most visible feature of a traditionally-built mine shaft is the headframe (or winding tower, poppet head or pit head) which stands above the shaft. Depending on the type of hoist (or winder) used, the top of the headframe will either house a hoist motor or a sheave wheel (with the hoist motor mounted on the ground).
A movable scaffolding system (MSS) is a special-purpose self-launching form used in bridge construction, specifically prestressed concrete bridges with segments or spans that are cast in place. The movable scaffolding system is used to support a form while the concrete is cured; once the segment is complete, the scaffold and forms are moved to ...
On April 27, 1978, tower number 2 had reached a height of 166 feet (51 m). Just after 10:00 a.m., the previous day's concrete started to collapse under the weight of the scaffolding and the construction workers on it. Concrete and scaffolding began to unwrap from the top of the tower, first peeling counter-clockwise, then in both directions.
“These are our Eiffel Tower or Big Ben,” says Teitur Samuelsen, CEO of Eystur-og Sandoyartunlar, the company operating the tunnels, “with people, especially tourists, driving through them ...
Headframe of the #1 Shaft at Oyuu Tolgoi. A steel headframe is less expensive than a concrete headframe; the tallest steel headframe measures 87 m. [4] Steel headframes are more adaptable to modifications (making any construction errors easier to remedy), and are considerably lighter, requiring less substantial foundations.
Space Shuttle Discovery is carried by a Crawler-transporter, a launch tower is visible in the background. A service structure is a steel framework or tower that is built on a rocket launch pad to facilitate assembly and servicing. An umbilical tower also usually includes an elevator which allows maintenance and crew access. Immediately before ...
Partially guyed towers are typically used when a very high tower for FM and TV transmission is required, while also carrying antennas for directional radio services at a much lower height. In such cases the antennas for directional radio services are mounted on the top of the free-standing part of the tower, while the guyed mast on its top ...
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