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Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels, floors, roofs, and piles.
The bridge, also known as the Natchez Trace Parkway Arches, is the first segmentally constructed concrete arch bridge in the United States. [2] The arches comprise 122 hollow box segments precast in nearby Franklin, each of which was about 9.8 ft (3.0 m) long and weighed between 29 and 45 short tons. [2]
Culverts can be constructed of a variety of materials including cast-in-place or precast concrete (reinforced or non-reinforced), galvanized steel, aluminum, or plastic (typically high-density polyethylene). Two or more materials may be combined to form composite structures. For example, open-bottom corrugated steel structures are often built ...
The Canberra monocrete homes are built on brick piers and surrounding brick footing, and all of the walls are of monocrete construction including interior ones. They are precast with steel windows and door frames set directly into the concrete. Steel plates in the ceiling space bolt the individual wall panels together.
Finally, the concrete is placed and cured, freeing the falsework to be moved. In pre-cast bridges, the concrete segment is constructed on the ground, and then transported and hoisted into place. As the new segment is suspended in place by the crane, workers install steel reinforcing that attaches the new segment to preceding segments.
If the spandrel is solid, usually the case in a masonry or stone arch bridge, the bridge is called a closed-spandrel deck arch bridge. If the deck is supported by a number of vertical columns rising from the arch, the bridge is known as an open-spandrel deck arch bridge. The Alexander Hamilton Bridge is an example of an open-spandrel arch bridge.
Hayden Arch Bridge; Henderson Street Bridge; The Henley Bridge (Knox County, Tennessee) Henry Hudson Bridge; High Bridge (New York City) High Bridge (St. Paul) Honeymoon Bridge (Niagara Falls) Hurricane Gulch Bridge
Construction of a prefabricated modular home (see also time-lapse video)Prefabricated homes, often referred to as prefab homes or simply prefabs, are specialist dwelling types of prefabricated building, which are manufactured off-site in advance, usually in standard sections that can be easily shipped and assembled.
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