Adequate shoring is critical to the safety of a construction project. Therefore, a primary consideration in choosing a system is its load capacity - shoring must be able to support concrete and formwork loads until the concrete becomes structurally self-sufficient. Of equal importance is adequate bracing for any shoring system selected. The following describes six types of adjustable shoring methods and some of the features and capabilities of systems available in each category:
- SINGLE POST SHORES: A post shore is a vertical support generally made of steel, aluminum, or wood. It is often used for reshoring.
- SCAFFOLD-TYPE FRAME SHORING: Tubular-steel frame scaffolding was originally developed to support workers and relatively light loads of construction materials.
- HORIZONTAL SHORING: Made of aluminum or steel, horizontal shores have an inside member, usually an I-beam or plate section, which telescopes from an outside lattice member or box-beam.
- FLYING TRUSS SYSTEMS: Supported on a previously cast slab, the aluminum trusses are topped with aluminum or wood joists to support plywood decking or pan forms for a complete bay.
- COLUMN-MOUNTED SHORE BRACKETS: Brackets that bolt to columns or walls can support flying deck forms without vertical shores. Because loads are transmitted to columns and walls and not new slabs, most reshoring can be eliminated too.
- FRICTION COLLARS: Similar to shore brackets, friction collars mount onto columns to support forms without the need for vertical shores. The two sides of the collar bolt tightly together around the column like a clamp.