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2. Screw piles - Wikipedia

   en.wikipedia.org/wiki/Screw_piles

   Screw foundations first appeared in the 1800s as pile foundations for lighthouses, [3] and were extensively used for piers in harbours. Between the 1850s through 1890s, more than 100 screw-pile lighthouses were erected on the east coast of the United States using screw piles. Made originally from cast or wrought iron, they had limited bearing ...

3. Earth anchor - Wikipedia

   en.wikipedia.org/wiki/Earth_anchor

   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.

4. Screw-pile lighthouse - Wikipedia

   en.wikipedia.org/wiki/Screw-pile_lighthouse

   Fowey Rocks Light, near Key Biscayne, Florida Spit Bank Lighthouse , in Cork Harbour , Ireland was built by Alexander Mitchell between 1851 and 1853 and is still in use. Carysfort Reef Light , four miles east of Key Largo , Florida , was built in 1852 and was the oldest screw-pile (with disk) lighthouse still in service in the United States ...

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6. Screw picket - Wikipedia

   en.wikipedia.org/wiki/Screw_picket

   A screw picket is a metal device which is used to secure objects to the ground. Today, screw pickets are used widely to temporarily "picket" dogs. They are also used to graze animals such as sheep, goats, and horses. Screw pickets are also used to stabilize small trees, tent poles, and other objects that are intended to remain upright.

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