BS EN 1004-1:2020 pdf download
BS EN 1004-1:2020 pdf download.Mobile access and working towers made of prefabricated elements Part 1: Materials, dimensions, design loads, safety and performance requirements.
— a frame of which the principal guardrail forms the top edge, or a fencing structure.
Openings in the side protection shall be so dimensioned so that a sphere with a diameter of more than 470 mm will not pass through them.
7.4.4 Toe-board
It shall be possible to fix a solid toe-board such that its top edge is at least 150 mm above the adjacent platform level. Apertures in toe boards shall not exceed 25 mm in width. This does not apply to apertures like hand holes.
7.5 Castor wheels
7.5.1 General
Castor wheels shall be fixed to the tower in such a way that they cannot be unintentionally detached. The castor wheel shall not detach from the frame due to the action of l self-weight.
7.5.2 Brakes
All castors shall have wheel brakes. They shall have swivel brakes if the wheels are eccentric when locked.
The brake niechanism shall be designed in such a way that It can only be unlocked by a deliberate action, The brake mechanism shall effectively prevent any rotation of the wheel when a horizontal force of 0,30 kN is applied through the vertical swivel axis of the castor as close as possible above the castor housing and in the rolling direction of the castor. The full value of the specified service load per castor wheel is to be applied when testing the castor brakes. A minimum of five control tests shall be carried out.
7.5.3 Test loads
The test shall be carried out on the complete castor wheel.
The vertical service load per wheel given by the manufacturer of the mobile access and working tower shall be verified by a minimum olfive tests.
The test load shall be three times the service load per castor wheel derived from the most unravourable load combination from Table 3.
When the brakes are locked, an initial vertical load of 0,50 kN shall be applied. The plate of the fork shall be taken as the origin for measLirements of vertical displacement. d, and the residual deformation, d
The load shall be increased to the maximum test load, maintained for one minute and the vertical deformation, d,, shall be measured. The load shall be returned to 0,50 kN. After 30 mm, the residual deformation, d,, shall be measured.
The test shall meet both of the following requirements:
— residual deformation, d,, after 30 mm shall not be more than 3,00 mm;
— total deformation, d,. shall not be more than 15 mm.
The service load Is verified it all five tests nwet the test requirements.
7.5.4 Wheels
Wheels shall he of puncture less type.
7.6.2 General requirements
Access to the platforms 2 m height in an assembled tower shall be within the main structural supports using one of the access methods specified in 7.6.1 and shall:
— be secured against unintentional Loosening:
— not rest on the ground;
— have a distance from the ground to the first step or rung of 400 mm maximum taking Into account adjustable legs. If the first step is a platform, 600 mm is allowable;
— have steps/rungs with constant spacing and a slip resistant surface.
7.6.3 AddItional requirements
7.6.3.1 StaIrway and stairladder
The outside of stair flights shall be provided with a handrail which runs approximately parallel to the stairs. Where a flight of stairs is provided in a continuous dog-leg style, a handrail shall also be provided on the inside. When flights of stairs are interrupted by platforms at 2,25 rn intervals, the inside handrail maybe omitted.
flights of stairs in a continuous dog-leg style shall have landings. Each of these stairs shall have a minimum of one landing and this shall have a minimum length of 300 mm,
The minimum clear height for access measured between the steps and the supporting structure of the stairway or stalrladder above shall not be less than 1,75 m.
