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In 1915, the Joroleman mailbox, named after its designer, Post Office employee Roy J. Joroleman, was approved by the U.S. Post Office. [17] Joroleman, who held a degree in mechanical engineering, designed his mailbox with an unusual dome-rectangular shape, incorporating a curved, tunnel-shaped roof, latching door, and rotating semaphore flag.
Single helix earth anchors Guyed mast anchor. An earth anchor is a device designed to support structures, most commonly used in geotechnical and construction applications. Also known as a ground anchor, percussion driven earth anchor or mechanical anchor, it may be impact driven into the ground or run in spirally, depending on its design and intended force-resistance characteristics.
The new office tower was initially planned to contain 42 stories with an additional three sub-floors. A cafeteria floor was removed in 1970, and the exterior materials were selected – limestone and bronze-tinted glass. The building's cost was estimated at $50-52 million, with groundbreaking on June 1, 1971. [46]
Poles, from which these buildings get their name, are natural shaped or round wooden timbers 4 to 12 inches (100 to 300 mm) in diameter. [4] The structural frame of a pole building is made of tree trunks, utility poles, engineered lumber or chemically pressure-treated squared timbers which may be buried in the ground or anchored to a concrete slab.
A hold-down may also refer to clamping device used to anchor a pipe to a structural steel element or concrete floor or allow movement of the pipe in an axial direction. [1] At the bottom, the hold down is connected to the concrete foundation or structural slab by an embedded or epoxied anchor bolt. At the top, the hold down is connected to a ...
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