DESCRIPTION 'Safe-t-Guard' Freestanding Guard-rail System Consisting
of galvanised steel tubular rails, uprights (48.3mm dia.)
and bases. The standard bases are 800 x 150 x 20mm and
weigh 20kg. Each has a 280mm long angled socket welded
90mm from the leading edge, for location of the uprights.
Bases at the end of a run weigh 50kg. This is achieved
by adding two 600 x 150 x 20mm counter weights which
straddle the rear of the standard base using a 320 x 65mm
bridging plate, secured with a M12 bolt. All bases
have ribbed rubber contact surfaces for improved
"stiction" on the roof surface. Welded sockets mounted
at the top (1.1m) and 0.5m from the top of the uprights,
locate the horizontal rails.
METHOD OF TEST
A 6 metre run consisting of 3 x 2m spans was set up
using a 6m length of rail. The bottom guardrail was set
at a height of 0.6m from the test surface. The system
was positioned on a flat concrete surface covered with
mineral roofing felt to simulate a typical roof surface
on which the system would operate in service.
A hydraulic jack and load cell set-up was used to test
each loading point necessary. The three load points were:
A. Top rail at upright at end of 6m run.
B. Top rail at upright 2m from end of 6m run.
C. Top rail at mid-span of 6m run.
The loads to be withstood at each load point and
permissible displacements from datum points were:
Load point A = 0.7 kN < 100mm
Load point B = 0.7 kN < 100mm
Load point C = 0.3 kN < 35mm
Load point C = 0.7 kN < 100mm (at manufacturers request, normally only 0.3 kN required for pass)
The object of testing was to ensure the system conformed
to HSE Specialist Inspector Report No. 15 : 1988.
The 'Safe-t-Guard' Freestanding Guard-rail System
conformed with the test requirements as detailed above,
when tested at the NEL.