The main job of trench boxes is to be installed by pushing them into the ground before excavations. This is done after ensuring that the side of the trench box is always supported. The trench width is usually chosen to allow for the pipe diameter and surround, the width of the excavator bucket, and the thickness of the box panels. With the box set at the right width, the section of the trench is then dug to a depth of 0.5m – 1.0m depending on the type of soil. This will allow the trench box to go in. The trench shoring box is then placed in the excavation and pushed down at each edge in turn. When pushing the edges, the angle of the struts to the horizontal should not be more than 5 degrees. For a 1 meter wide strut, one end should not be more than 3 and half inches below the other strut. Panels should not be pushed down in the middle of the top edge.
Trench Box Work is Safety
Whether digging the foundation for a building or laying pipes or wires, trench boxes ensure worker safety and play a major role in the prevention of cave-ins and injuries. These trench cages feature high-tensile steel sidewalls and extra pipe clearance for dependable, rugged performance in-the-trench. Trench boxes are particularly used where the ground is not stable. With their spring mounted flexible spindles, the steel trench boxes can be installed with the “cut and lower” method. The range differs with regard to the thickness of plates and the safe working loads. They provide effective protection for contractors working in moderate to deep trench applications in a variety of soil conditions. By eliminating the knife edge found on the bottom of many trench boxes, they can be used in any configuration when stacked in deep trenches. In case of a trench collapse, a trench box is designed to protect workers within the trench.
Trench boxes are not meant to shore up nor support trench walls. They’re only meant to protect workers in case of a cave-in. The space between the trench box and the trench wall should be back-filled. Otherwise a cave-in or collapse may cause the trench box to tilt or turn over. It’s also easier to enter the shoring box if soil comes right up next to it. Trench boxes are commonly used in open areas away from utilities, roadways, and foundations. If you’re in the trench, stay inside the trench box.