The mini-excavator can work to clear out the inside and sink the inner trench box. Having a smaller and lighter box at the bottom makes it easier to remove safely and without over-sized excavators brought in just to extract the shoring. In Photo 2 you see a classic 4-sided system, but with a special twist. The top 8’ is shored, then around the sub-grade, the next 8’ is shored, but using a smaller footprint. The offset in the bottom tier, helps create greater accessibility. This makes for a very manageable 4-sided shoring system in deep situations.
This method is a lot faster and certainly less expensive than employing sheet piling. Some of the more dramatic examples of camp-cup systems can look similar to benching. Each bench getting its own shoring system. This design helps reduce surcharge loads and lateral earth pressures experienced by the lower systems. It also provides excellent placement for multi-stage dewatering in very wet situations as well. In the illustration you can see what it looks like from the basic elevation perspective and how the system works. Using the TSS Shoring Frame in a camp-cup solution is a fast way to approach 4-sided applications because of the high degree of modularity the Shoring Frame provides.