Graphical Construction Glossary >> Temporary Work. >> formwork >> Screw Jacks
Simple fittings made out of solid steel they have a course, easily cleaned square thread suitable for load bearing. The plates are out of about 6mm steel 150mm square. The base plates have holes in them for nailing them to timber sole plates. The jacks are adjusted by hand with no load on them, and them a hammer is used to turn them if any load is on them.
At the right is a "U" jack that will easily allow a couple of 150 x 100 (6"x4") bearers to sit in it. The large wing nut sits on the pipe of the shore, while the main threaded part of the jack goes into the pipe. The manufacturers give recommendations for the the maximum extension allowed.
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