This Assembly guide is designed to provide you with step by step instructions to ensure your system is
erected easily and safely using the 3T (Through the Trap) Safety Standard. Before assembly please read
the safety notes carefully.
Span 500 is a mobile access tower system complying with EN 1004 and WAHR, with vertical ladder access, designed for Class 2 loading.
Safe Working Loads and Working Heights
(WAHR)
The safe working load at each level of platform is 275
Kg evenly distributed, regardless of whether one or
two platforms are installed. Therefore, even if two
platforms are installed side by side, total cumulative
load shall not exceed 275Kg distributed.
The total loading on the tower structure should not
exceed 720kg. Normal maximum platform height for
indoor use is 12m for Double Width, and 8m for
Single Width. For outdoor use, the maximum height is
8m for Single and Double Widths.
3T Safety Standard - THROUGH THE TRAP
This is an approved method of tower construction
which, if carried out by a competent person,
complies with all current safety legislation.
Construction - basic principles
• Always install the trapdoor platform over the
ladder (if one is fitted).
• Ensure the trapdoor hinges to the
OUTSIDE
of
the tower (not the centre).
• Once the platform has been installed, climb, using
the approved method and
SIT IN THE
TRAPDOOR OPENING.
• While seated, attach horizontal braces to the
frames to form guardrails on
BOTH SIDES OF
THE PLATFORM.
• See assembly instructions for specific placement
of guardrails.
• 2 braces are normally required each side -
although bracing frames can be used on the
outside if desired or specified in the instructions.
• Only when the platform is fully guarded is it safe
to stand up.
Dismantling
• Unlock the brace ends furthest away from the
trapdoor.
•
DO NOT REMOVE BRACES UNTIL SITTING IN
THE TRAPDOOR.
ASSEMBLY PROCESS
1. Preparation
Locate the tower level adjusters on each leg at 10cm (4ins) from the bottom of the leg.
Unlock the interlock clips on all frames. When installed, always move the interlock
clip to the "locked" position.
Sort the braces into horizontal and diagonal braces - the diagonals are slightly longer.
Unlock the brace locks.
2. Base
Push the four leg assemblies into a pair of 2-rung (1m) or 4-rung (2m) frames.
Follow the erection procedures as shown (Section 4). It is important to follow the
bracing pattern precisely. The tower shown in the build procedure is a double
width tower. For Single Width Towers, see notes section.
Note the locking and unlocking position for the castors as shown here.
3. Locking down the platform
A windlock clip is installed on the platform at the hook. This is locked as shown here.
Base
The choice of base frame for your SPAN 500 tower depends on the platform height required: See table 1 below:
Unlocked
Locked
Unlocked
Locked
Unlocked
Locked
4m Platform Height Tower
Assembly
1.
Toeboard Set
2.
Diagonal Brace
3.
2m Standard Frame
4.
Horizontal Brace
5.
Stabiliser
6.
1m Standard Frame
7.
Adjustable Leg
8.
Castor
9.
1m Ladder Frame
10.
2m Ladder Frame
11.
Fixed and Trapdoor Platform
3m Platform Height Tower
Assembly
1.
Toeboard Set
2.
Diagonal Brace
3.
Stabiliser
4.
2m Standard Frame
5.
Adjustable Leg
6.
Castor
7.
Horizontal Brace
8.
2m Ladder Frame
9.
Fixed and Trapdoor Platform
ASSEMBLY COMPONENTS
4. BUILD PROCESS
To Dismantle, follow the build process but in reverse order noting the
following.
• To remove the guardrail frames or braces, first unlock the hook at the
end away from the trapdoor.
• Sitting through the trapdoor, unlock the near end hook and remove
the brace.
To Move the tower to a new position, first prepare the tower.
• Wind speed should not exceed 29 km/hr (force 4).
• Release the castor brakes.
• Raise the stabiliser feet only enough to clear obstructions.
• Ensure tower is empty (material and personnel). Move the tower
manually by applying force at the base - do not use machinery to push
or pull the tower. Once moved - prepare the tower for use.
• Check all castors and stabilisers are in firm contact with the ground.
• Check tower is vertical (spirit level) and adjust legs as required.
• Reapply the castor brakes.
Insert castors and
adjustable legs into the
base frame (see table 1
on selecting the base
frame). Position the
ladder frame as shown
and clip one horizontal
brace onto the vertical
member just above the
1
st
rung, with claw
facing outwards. Clip the
2
nd
horizontal brace
onto the cross tube
(rung) on the opposite
side facing down.
Insert one 4 rung
standard frame and one
4 rung ladder frame into
the base frames and
lock. Clip diagonal
braces in opposing
directions from the 1
st
to
3
rd
to 5
th
rungs. Check
base unit with a spirit
level in both vertical and
horizontal directions.
Fit stabiliser to tower -
see separate section on
stabilisers. Add a fixed
platform to 1
st
rung in
front of the ladder.
Fit trapdoor platform to
4
th
rung of tower in front
of the ladder. Ensure
trapdoor opens
outwards.
Using the 3T method,
position yourself in the
hatch and attach
horizontal braces to the
5th and 6th rung on both
sides of the platform. Do
not stand on the
platform until it is fully
guarded.
Attach the next set of
frames and lock.
Continue diagonal
bracing in a zig-zag
pattern as shown.
Install next platform at 4
rungs above the last
one. Use the 3T method,
install 2 braces on both
sides of platform before
climbing onto platform.
Continue with steps 6
and 7 until working
platform height is
reached.
Once working height is
reached, move fixed
platform from 1
st
rung to
working level, opposite
to ladder. Fit trapdoor
platform at ladder. Guard
with horizonal braces
using the 3T method.
Once guarded, climb
onto the platform and fit
toeboard set to
complete the tower
build.
DISMANTLING / MOVING TOWERS
1
2
3
4
5
9
8
7
6
Assembly Guide
Span
500
ACCESS TOWER SYSTEM
Platform height (m)
Base Frame Parts required
2, 4, 6, 8, 10, 12
1m (2 rung) One frame and one ladder frame
3, 5, 7, 9, 11
2m (4 rung) One frame and one ladder frame
Table 1
REMEMBER - NEVER STAND ON
AN UNGUARDED PLATFORM
Unlocked
Locked
EN1004-3-8/12-XXCD
