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Shoring

Using a number of shores to support a temporary construction element or to support an unsafe building or to temporarily support adjacent buildings when new construction is carried out.

Shore

A single prop or brace that is used to support temporary work or an unsafe part of a structure. They are often subdivided into the following categories:- Dead shores acting vertically, raking shores at an angle and flying shores bracing horizontally.

Cribbing

Squared timbers or concrete members used to provide support or used in a retaining wall.

Box crib

A layout of squared timbers or similar concrete beams used as the lining of a shaft in mining and excavation work.

The photo above shows the underpinning of a small railway bridge. The large section timber railway sleepers laid in a rectangular framework like this was what we called a "pigsty" at the time. This arrangement of horizontal timbers used to make a solid support had been used for centuries in underground mining and it is there that the term cribbing or box crib originated.

Box cribs were much used for emergency repairs and quick strengthening of damaged buildings. They are a classic example of shoring before the modern age of purpose made steel shore frames and hydraulic rescue systems.

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