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The architect wanted the cardboard tubes to be the structural elements, but local manufacturers could not produce tubes thick enough and importing the cardboard was rejected. [12] The 96 tubes, reinforced with laminated wood beams, are "coated with waterproof polyurethane and flame retardants" with two-inch gaps between them so that light can ...
A heavy duty composite paper tube. The layers of spiral-wound paper used in its construction are visible. This type of heavy tube is also used as a core for wrapping roll goods. Long corrugated box, square cross section Paperboard tubes. A shipping tube, mailing tube, or cardboard tube is a shipping container used to ship long items. It is ...
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
The 20-by-12-foot home is constructed from cardboard paper tubes that form its structural frame, along with plywood for the floor and walls. It has a covered roof and a few windows, and sits atop ...
The tremie concrete placement method uses a vertical or nearly vertical pipe, through which concrete is placed by gravity feed below water level. [4]The lower end of the pipe is kept immersed in fresh concrete so that concrete rising from the bottom displaces the water above it, thus limiting washing out of the cement content of the fresh concrete at the exposed upper surface.
In 1964, the Board of Education authorized the construction of a 14 ft (4.3 m) diameter by 8 ft (2.4 m) high concrete block building, topped off with a rotating metal dome and retractable shutter to house the instrument. The footings and central piling were poured in early 1964, and the observatory became operational in 1965.
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