Span 400 Assembly Guide
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 400 is a mobile access tower system complying with EN 1004 and WAHR, with vertical ladder access, designed for Class 3 loading.
4. BUILDPROCESS
Safe Working Loads and Working Heights
(WAHR)
The safe working load at each level of platform is 360Kg 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 360Kg 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.
• Braces are 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.
REMEMBER - NEVER STAND ON AN
UNGUARDED PLATFORM
Insert castors and
adjustable legs into the 5
rung frames. Clip
horizontal brace onto the
vertical member just above
the 1st rung, with claw
facing outwards.
Attach diagonal braces in
opposing directions from
the 1st to the 3rd rung.
Attach platform to the 2nd
rung (ensure hinge opens
outwards and above
ladder). Check the base
with a spirit level in both
vertical and horizontal
directions and adjust the
legs if necessary.
Fit Guardrails (horizontal
braces) to the 4th rung
either side of the ladder
close to the platform. Insert
1 standard frame and
ladder frame to the lower
frames, and engage
locking pins.
Continue diagonal bracing
in a zig-zag pattern by
attaching 2 diagonal
braces on each side (4th to
6th and 6th to the 8th rung).
Fit stabilisers to the base
unit - see separate section
on stabilisers below.
Fit trapdoor platform to
the 7th rung of the tower.
Using the 3T method, clip
3 horizontal braces on the
8th, 9th and 10th rungs on
the inside of the platform.
Clip 1 bracing frame to the
outside of the tower with
claws outwards.
Fit additional standard and
ladder frames and lock.
Clip 3 diagonal braces
from rung 9 to 13 in a zig
zag pattern and from rung
11 to 13 (opposing
direction). Also move the
trapdoor platform from the
2nd rung to the 12th rung.
Using the 3T method. Clip
3 horizontal braces to the
13th, 14th and 15th rungs
on the inside of the
platform. Clip 1 bracing
frame to the outside of the
tower with claws outwards.
Fit two guardrail frames
and lock. Fit two bracing
frames and one plain
platform the opposite side
of the ladder on the 15th
rung. Then remove the
horizontal brace from
inside the platform and
place on the lower rung.
Fit 1 trapdoor platform
above the ladder on the
15th rung to form the
working platform and fit
toeboards to complete the
build. For towers of
different heights see
separate section below.
12345
10
9
8
7
6
ASSEMBLY COMPONENTS
4m Platform Height Tower Assembly
1. Guardrail Frame
2. Bracing Frame
3. Toeboard Set
4. Bracing Frame
5. Diagonal Brace
6. Stabiliser
7. Adjustable Leg
8. Castor
9. Horizontal Brace
10. 5 Rung Ladder Frame
11. Fixed and Trapdoor Platform
12. 5 Rung Frame
3m Platform Height Tower Assembly
1. Guardrail Frame
2. Bracing Frame
3. Toeboard Set
4. 3 Rung Frame
5. Diagonal Brace
6. Stabiliser
7. Adjustable Leg
8. Castor
9. Horizontal Brace
10. Fixed and Trapdoor Platform
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
5-rung (2m) frames, with 10cm (4ins) of threaded leg showing.
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.
Unlocked
Locked
Unlocked
Locked
Unlocked Locked
Unlocked Locked
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 caster 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 casters and stabilisers are in firm contact with the ground.
• Check tower is vertical (spirit level) and adjust legs as required.
• Reapply the caster brakes.
DISMANTLING / MOVING TOWERS
Lightly tighten the upper clamps above the fourth rung on each corner post. Position the lower
clamp above the bottom rung. Ensure the lower arm is as horizontal as possible. Position the
stabilisers so that the footpads are approximately equidistant from each other, as seen here.
Telescopically adjust the leg and reposition the clamps as required to make firm contact with the
ground. Ensure the clips with locking pin are in place. When in the correct position, tighten the
clamps firmly.
To position the tower against a wall, do not remove the stabiliser, move parallel with the wall.
To position the tower in a corner, remove the inside stabiliser and place the outside two parallel
with the wall.
Ballast weight maybe used to stabilise the tower, please contact your supplier for the correct
amount of ballast weight required.
STABILISERS
EN1004-3-8/12-XXCD
