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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.
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 ...
Culvert structures are a very simple approach. Large precast concrete pipes and boxes a few metres across are assembled into the desired arrangement of rooms and hallways onsite, either atop the existing ground or below grade in excavated trenches, then buried.
Precast concrete barrel sections before installation. The chamber section can be built in various materials. In the 19th century, manholes in the United States were built with bricks and mortar or stone. In the mid-20th century, precast concrete was introduced. In the late-20th century cast-in-place concrete was used.
Construction of a concrete box culvert will be installed along rail tracks in Lathrop to allow for a new rail connection for the Stanislaus County lines of the Altamont Commuter Express (ACE) train.
[1] Because of these conditions, the enclosure needed to be built with materials that would minimize damage from these hazards and be most cost efficient. Some of the materials that were considered were precast concrete, cast-in-place concrete box culverts, low-head non-cylinder reinforced concrete pressure pipe, and welded-joint spirally ...