The Drag Box has been designed for trench shoring projects in open terrain and with stable soils, and only secures a small area for laying the pipes. The end faces remain unshored, and must be sloped according to ground conditions.
Further excavation of soil takes place ahead, and the Drag Box is pulled through the excavated trench to the new working position. The area behind the box is filled and compacted, while pipe laying occurs in the area protected by the shoring plates.
Recommended
In open terrain
No pipes/cables crossing
Where it cannot be affected by buildings and physical structures
Where it cannot be affected by roads or thoroughfares and away from endangered cables
In temporary stable soils
In dry ground
With mechanical compacting from above
When settlement can be accepted