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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.
Readymix had established subsidiaries in China, supplying concrete for the cities of Tianjin and Qingdao. Humes, a manufacturer of concrete products including pipe, rail track materials, precast concrete bridges, culverts and the like, for the Australian market. Humes is still a major player in this market as a subsidiary of Holcim Australia.
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]
The majority are pre-cast concrete pipe culverts, some with stone surrounding the outlets, of varying sizes (approximately 300mm-750mm diameter) and single and double-pipe configurations. [1] Two substantial off-form box culverts are located at the railway turning triangle and near the approach to Wee Macgregor Mine.
Prestressed concrete cylinder pipe (PCCP) is a common variety of large-diameter concrete pressure pipe used for transporting water and wastewater. PCCP is typical manufactured according to the American Water Works Association (AWWA) standard C304. [ 1 ]
To install this, the doghouse manhole is lowered to have the two openings to slide over the existing pipe. The concrete is poured in to form the base with slopes from the precast concrete wall down to the half point of the existing pipe. This forms a half bench for the manhole base. The top half of that existing pipe is cut open to form a channel.