Assembly and placement of shoring is a dangerous activity, and no one besides the workers involved in the task should be in the immediate area. A competent person must inspect the shoring to ensure it is in good condition and all components are present.
Riggers must be trained before handling rigging activities. Rigging used must be inspected before every use, checking for damage and ensuring that capacity tags are present. Tag lines must be used to maneuver the load, no one should touch a suspended load until it is nearly landed. Always use approved pick points. No piece of shoring may be lifted without rigging. Do not lift shoring using an excavator bucket or other equipment. This will gouge or bow the shoring, rendering it defective, and voiding any warrantee. All defective shoring must be taken out of service.
When shoring is stacked, it must be pinned together to prevent movement. When a stacked unit is placed, it should be backfilled to within 6 inches of the walls. Pins may be installed at the end of the shoring, on the outside, or using brackets on the inside of the shoring.
Each piece of shoring has its own capacity. This depends upon the thickness of the walls, the height and the length of the shoring. A 12 foot long trench shield is rated for more than twice the depth of a 24 foot long shield. This is because the 24 foot long shield is more likely to bow in the middle, having more compression from the soil around it. Your soil type also affects the rating, sandy soils and Type C soil are weaker and require a higher capacity shield. If you are not sure of the capacity of the shoring, ask a supervisor.
Guardrails must be used for excavations more than 6 feet deep. If the shoring extends above the elevation by at least 42 inches, the shoring may act as the guardrail. The shoring may be installed before the shoring is placed in the excavation. This will provide protection to the workers involved in the installation, and the workers who will work in the excavation after them.
A ladder must be provided for access, and ladder extensions that allow a worker to walk through the opening are recommended. The access way must be kept clear of clutter and good housekeeping maintained. Once the work in the excavation is complete, the shoring should be removed and the excavation backfilled as soon as possible. Excavated soil becomes weaker as time passes.
When shoring is not in use, it should be stored out of the path of traffic. Small part, such as spreader bars, pins and keeper pins should be on pallets or in boxes to avoid being lost. Shoring should be kept on dunnage to avoid excess contact with the ground, which speeds up corrosion. Shields may be stored upright or on its side, but the units may not be stacked while in storage, only in use and in the excavation. We have invested an immense amount of money in this equipment. Please help us keep you safe by taking care of it. Report any concerns or problems immediately.