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Double tee structure is an alternative for short to medium spans between 40 and 90 feet (12 and 27 m). There are many standards such as double-tee beam of Texas Department of Transportation and the Northeast Extreme Tee (NEXT) Beam of the Northeast. [8] A benefit of using double tees for bridge replacements is to shorten the construction time.
A double-T beam or double tee beam is a load-bearing structure that resemble two T-beams connected to each other. Double tees are manufactured from prestressed concrete using pretensioning beds of about 200-foot (61 m) to 500-foot (150 m) long. The strong bond of the flange (horizontal section) and the two webs (vertical members) creates a ...
The use of double tees with wide flanges allows the use of fewer beams, which stay in place to form the deck, resulting in a shorter construction time. The first design was introduced in 2008, called "NEXT F" with 4-inch (10 cm) flange thickness requiring a 4-inch (10 cm) topping.
Prestressing is a technique of introducing stresses into a structural member during fabrication and/or construction to improve its strength and performance. This technique is often employed in concrete beams, columns, spandrels, single and double tees, wall panels, segmental bridge units, bulb-tee girders, I-beam girders, and others.
Technical terms for similar items include H-beam, I-profile, universal column (UC), w-beam (for "wide flange"), universal beam (UB), rolled steel joist (RSJ), or double-T (especially in Polish, Bulgarian, Spanish, Italian, and German). I-beams are typically made of structural steel and serve a wide variety of construction uses.
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Mark and his siblings grew up in Dorchester, a neighborhood in Boston. Their mother Alma Wahlberg worked as a bank clerk and nurse’s aide while they were kids, and their father Donald Wahlberg ...
Double-headed rail on display at the Nuremberg Transport Museum In late 1830s, Britain's railways used a range of different rail patterns. The London and Birmingham Railway , which had offered a prize for the best design, and was one of the earliest lines to use double-headed rail, where the head and foot of the rail had the same profile.