Dragboxes provide a safe and rapid means of pipe laying in good, dry, stable ground. They should
only be used when the ground will stand to the depth of the fully excavated trench and they are intended to act
as a shield in the event of trench wall instability. The normal method of operation is for the excavator to drag
the box forward by pulling on the front strut.
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High Clearance Dragbox
- Base Panel length: 5110mm
- Base Panel height: 3220mm
- Vertical clearance below rear strut on base box: 2278mm
- Vertical clearance below front strut on base box: 1225mm
- Horizontal clearance between struts on base box: 4500mm
- Top Extension Panel length: 5110mm
- Top Extension Panel height: 1820mm
- Vertical clearance below rear strut on extension box: 875mm
- Vertical clearance below front strut on extension box: 430mm
- Horizontal clearance between struts on extension box: 4500mm
- The Extension box can also be used as a base box if required.
- Uniform lateral earth pressure of 25kN/m²
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Mini, Midi and Maxi Dragboxes
- The length of the Mini Dragbox is 3040mm
- The length of the Midi Dragbox is 4040mm
- The length of the Maxi Dragbox is 5040mm
- Each type has a 2000mm high base box and a 1000mm high top extension box to increase the height
- Mini, Midi and Maxi Dragboxes have struts with a facility for minor length adjustment on site if required
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Standard Dragbox
Standard Dragboxes are available in 2 sizes:
5m Standard (length = 5000mm, height = 2480mm) and
7m Standard (length = 7070mm, height = 2000mm)
- The 5m Standard also has a 1520mm high top extension box
- The 7m Standard Dragbox may be connected in a piggy-back manner to double the height to a maximum of 4m
- Struts for the Standard Dragboxes are NOT adjustable. The box will be supplied with suitable struts to fit your excavation
- Both Standard Dragboxes can be fitted with hog-back rear struts to increase the width and clearance under the rear strut
- The 7m Standard Dragbox can be fitted with a 2m long rear extension to increase the overall length to 9.0m. This
assembly has one front and two rear strut positions giving 6.35m clear between struts as per the Standard 7m box
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