Sheeting

A wall of metal plates or wood planking to keep out water, soft or runny materials.

Shield

A steel cylinder at the face of a utility tunnel or casing, which may sometimes employ the use of a mechanical excavator and may be steerable, and provide hazard protection from the area covered.

Shield Cut

The theoretical difference between the radial measurement of the MTBM shield and the jacking pipe and is equal to (MTBM OD – PipeA long tube of clay, concrete, steel, metal, wood, etc., for conveying water, gas, oil or other materials. OD)/2.

Shield Tunneling Method

Method of excavation in the front of a tunnel or pipe jack using a shield.

Shop Drawings

All drawings, diagrams, illustrations, brochures, schedules, and other data which are prepared by the contractor, a subcontractor, manufacturer supplier or distributor and which illustrate the equipment, materials or some portion of the work as required by the contract documents.