Quantity Schedule - 1450 3T Method
4
Number of working platforms allowed
The MAXIMUM SAFE WORKING LOAD (the combined weight of the users, tools
and materials) that may be placed on the tower is the total weight less the self
weight of the tower. The total weight for the towers shown in the schedule is 950kg.
Example 1:
A 1450 tower built using the 3T method with a 4.2m platform height and a
platform length of 1.8m has a self weight of 175kg.
950kg — 175kg =
775kg maximum safe working load
total weight
self weight
(users, tools and materials)
Example 2:
A 1450 tower built using the 3T method with a 11.7m platform height and a
platform length of 2.5m has a self weight of 436kg.
950kg — 436kg =
514kg maximum safe working load
total weight
self weight
(users, tools and materials)
For greater heights and loads, consult Youngman for guidance.
Platform Loading
On a 1450 tower a platform may comprise of a single deck or two decks placed
side by side. The maximimum safe working load (the combined weight of the
users, tools and materials) that may be placed on a platform is 275kg. This must
be evenly distributed over either one deck, or two decks placed side by side.
The quantities on page 3 will enable BOSS towers to be built safely and therefore
comply with the requirements of the Work at Height Regulations 2005. They include
double guardrails to all platforms, and toeboards will need to be added if any levels
are used as working platforms and for storage of materials. BS1139 requires
platforms at least every 4m, and these measures will exceed that requirement.
Ballast: Internal/External use
There is no requirement for ballast on 1450 towers if using stabilisers as
detailed in the table on page 3.
Mobile Outriggers
MP7 mobile outriggers can be used instead of SP7 and SP10 stabilisers,
as detailed below. MP7 mobile outrigger kits comprise:
MP7 MOBILE OUTRIGGER
4
125/150/200mm CASTOR
4
(Use same diameter castors as on tower)
250mm ADJUSTABLE LEG
4
PLAN BRACES
4
The above components replace:
SP7/SP10 STABILISER
4
Stabilisers
To improve rigidity, larger stabilisers can be used at a lower level than
shown in the table.
