51 wrote:

Have you used the type of props that are used from one side and
replace the need
from props on both sides?

I think these are type
http://www.hss.com/g/50049/Strongboy_Hirepack.html

Arthur

Yes, you still need acrow props to hold them up...and HSS are expensive, I
pay about a fiver for a strongboy and a prop per week
You just chisel out a horizontal joint straight through the mortar bed and
these slot into it, over a 6ft span, one about 18in from each end will
suffice and one or two courses above the desired height...their main
drawback is that they are often in the way when coming to insert the
steelwork...also you'll need to order the steel because it sometimes can
take days...the order in which I would do this job is:
1) measure and order the steelwork, a 150 X 100mm will do it comfortably, at
whatever length you require.
2) once the steel is on site, hack off the plaster on both sides of the wall
and take up a few boards within a foot or two of the wall, spaced as
mentioned above
3) measure the height of acrows you will need, not forgetting the extra 2 -
3 ft for the 'cellar' and pick them up, with the strongboys and two extra
props (4 in total)
4) cut out the joints as req and insert the strongboys and props, making
sure the props are upright, use a spirit level if possible.
5) carefully remove the brickwork below each prop, not panicking when 3 or 4
bricks fall at once, try to keep the sides square and straight.
6) insert the girder to the height required and brick up on top of the
girder
7) next day, wedge in pieces of slate all along the brickwork horizontal
joints (IE above the bricks you've laid and the existing hanging brickwork)
8) insert one prop under eah end of the girder and tighten, to force any
loose brickwork etc back up, point up under each end of the girder, where it
will effectively be sitting.

Day after remove all props.