Our hi-clear box system is is ideal for the installation of larger pipes and culverts, providing reliable trench support and large clearances below the lowest spindles. The robust design makes this box suitable for most environments. 

With three adjustable spindles, the hi clear box can achieve widths of 0.85 – 4.48m using a combination of extension pieces. Temporary works design is also available for this trench box range.

Spindle Clearance

With a bottom spindle allowing a maximum clearance of 2290mm, there is not much this box can’t do:

  • 1690mm
  • 1990mm
  • 2290mm

Next Steps

For more information on our box systems range please contact your nearest depot or call us on 0117 982 8236 to get our latest rates. 

A forklift/machine must be provided to off load the kit from the delivery vehicle. Alternatively SEL can deliver the equipment

Bottom Strut
Setting
Pipe Clearance
Beneath Struts hC
(m)
Trench Width [b] v Permissible
Earth Pressure [kN/m²]
< 2.0m< 2.5m< 3.0m< 3.5m< 4.0m< 4.5m
High2.2921.821.818.515.2Contact SEL if a width
> 3.5m requires the
high strut setting
Medium1.9939.535.029.525.020.516.5
Low1.6945.645.641.035.028.522.5
Box Length
L
Panel Height
H
Maximum Weight per complete box
mmkg
Mini-0.0Midi-0.0Maxi-0.0Maxi-0.5Maxi-1.0Maxi-1.5Maxi-2.0Maxi-2.5Maxi-3.0
4.03.15 Base345534833516359536743753383339123991
1.4o Top142514381455149515351574161416531693
NB: The 1.4m Top panel is from our Standard Trench Box Range

Spindle Chart

Box
Spindle
Type
Trench Box / Hi-Clear Box
Internal WidthExternal Width
bCb
mm
Mini-0.00.65 – 0.750.85 – 0.95
Mini-0.51.15 – 1.251.35 – 1.45
Mini-1.01.65 – 1.751.85 – 1.95
Mini-1.52.15 – 2.252.35 – 2.45
Mini-2.02.65 – 2.752.85 – 2.95
Mini-2.53.15 – 3.253.35 – 3.45
Mini-3.03.65 – 3.753.85 – 3.95
 
Midi-0.00.83 – 1.021.03 – 1.22
Midi-0.51.33 – 1.521.53 – 1.72
Midi-1.01.83 – 2.022.03 – 2.22
Midi-1.52.33 – 2.522.53 – 2.72
Midi-2.02.83 – 3.023.03 – 3.22
Midi-2.53.33 – 3.523.53 – 3.72
Midi-3.03.83 – 4.024.03 – 4.22
 
Maxi-0.00.98 – 1.261.20 – 1.48
Maxi-0.51.48 – 1.761.70 – 1.98
Maxi-1.01.98 – 2.262.20 – 2.48
Maxi-1.52.48 – 2.762.70 – 2.98
Maxi-2.02.98 – 3.263.20 – 3.48
Maxi-2.53.48 – 3.763.70 – 3.98
Maxi-3.03.98 – 4.264.20 – 4.48
 
For 4.50m long Trench boxes, add 40mm to the ‘External Width’ column.

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