A reinforced concrete box, referred to as a box culvert in the UK and Hong Kong, is a square or rectangular "pipe" made of concrete with rebar or wire mesh fabric strewn throughout for the addition of extra strength. Multiple such boxes are arranged sideways to make a pipe or tunnel like structure.
It is often used for sanitary sewer trunks, storm drain spillways, pedestrian subways, utility tunnels, catch basins, and other similar underground passage ways. Due to the enormous strength of reinforced concrete, it is often used in sewers or tunnels that have little cover above them which means they will be subjected to the stress of the road atop them.
In India, pre-cast concrete boxes known as "Magic Boxes" are used for the construction of flyovers and underpasses.
Read more about this topic: Precast Concrete
Famous quotes containing the words concrete and/or box:
“Total loyalty is possible only when fidelity is emptied of all concrete content, from which changes of mind might naturally arise.”
—Hannah Arendt (1906–1975)
“The distant box is open. A sound of grain
Poured over the floor in some eagerness we
Rise with the night let out of the box of wind.”
—John Ashbery (b. 1927)