Graphical Construction Glossary >> Temporary Work. >> shoring >> Trench Shoring
There are many varieties of this type of safety device. In the retracted position one of these frames can be easily dropped into a newly excavated trench by a small mobile crane. Then, from the inside it can be jacked into a firm position against the trench sides. Some versions are jacked by hand, others are hydraulic or air operated.
They are made in various sizes and can be stacked one above the other in deep excavations.
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