falsework

Within a great cage of falsework Marie Louise could see the 178 ship that Davidge had dedicated to his mother.
The Cup of Fury|Rupert Hughes
The rebuilder of bridges works like the original builder—with plentiful falsework.
The Modern Railroad|Edward Hungerford
The new span was then in place, and the old one—ready to be dismantled—stood on falsework at the side.
The Modern Railroad|Edward Hungerford
The falsework was rapidly removed and the sustaining framework was painted with opaque varnish to render it plainly visible.
The Skylark of Space|Edward Elmer Smith and Lee Hawkins Garby

When the steel—the trusses—is up and riveted, then away with the falsework.
The Modern Railroad|Edward Hungerford

British Dictionary definitions for falsework

falsework

/ (ˈfɔːlsˌwɜːk) /

noun

a framework supporting something under construction

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012