final-report-of-the-advisory-committee-on-falsework-bragg-report - Flipbook - Page 128
The falsework to the in-situ concrete beams consisted of shoreload frames
spaced 5 ft apart, fitted with adjustable bases and forkheads. Timber bearers sat
in the forkheads to support the timber boxes for the beams.
Defects
(a) Foundations The site was very untidy with a mixture of timber sole plates
which sat on the concrete ground floor slab.
(b) Structure Most of the shoreload frames were seriously out of alignment.
Some of the forkhead screws were damaged and had been re-used.
Bracing had only been provided on one side of the frames and there were no
horizontal ties.
A reinforcing bar had been used instead of a proper pin on one of the props.
(c) Formwork The general standard of the timber formwork was poor, as
evidenced by split joists, warped timbers, and the untidy arrangement of
members.
Some of the timber bearers were eccentric in the forkheads.
Case 6
A multi-storey car park was under construction. Floors were precast and there
were in-situ main beams with in-fill precast panels.
The falsework consisted of adjustable props at 3 ft centres under the beams
and the precast main beams rested on the boxes for the in-situ edge beams.
Defects
(a) Foundations Some of the bases of the props were supported by cantilever
timber beams.
(b) Structure There was a lack of bracing between the props.
Some props which were of considerable height supported the timber bearers
in a precarious manner.
Reinforcing bars were used instead of proper pins in the props.
( c) Form work The arrangement of timber members for the in-situ concrete edge
beams was poor, resulting in unbalanced loading on the falsework.
The quality of timber in many cases was poor.
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