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A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ().They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
The Lally column is named after a U.S. inventor, John Lally, who owned a construction company that started production of these columns in the late 19th century. He resided in Waltham, Massachusetts and Boston during the period 1898–1907. He was issued four U.S. Patents on composite columns
Jacking and shoring, such as using jack posts, are used to hold a wooden building up during foundation and sill repairs. Little published information is available about building jacking methods. The skills are usually acquired through experience working for a building jacking or moving company.
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330000 adjustable steel prop 291000 post shore 83800 adjustable steel post 88100 adjustable jack post 51000 adjustable steel column 42900 shoring post 32000 Acrow prop 18900 adjustable steel shore In this case the clear winner is "adjustable steel prop", which is the most common term used in China.
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Inside the structure, a single Lally column, steel basement jack, wooden column or support post may hold up the floor above in a small basement. A series of these supports may be necessary for large basements; many basements have the support columns exposed. Since warm air rises, basements are typically cooler than the rest of the house.
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