Benching Excavation

When the embankment is constructed on hillside slopes it is necessary to bench the surface of the hill slope to add stability to the slope.

Benching excavation. For the new people in the business of constrution and development activities. Regular inspection the condition of soil surrounding excavations can change quickly when the soil dries out the water table changes or water saturates the soil. There are really two main reasons to bench a trench rather than slope a trench.

The finished surface of the benching is smooth so that it is self cleaning and allows for the unimpeded flow of sewage or drainage. These benches are usually at intervals 2 5 3 feet 0 76 0 91 m deep and twice as wide. Benching involves digging the trench in steps or tiers instead so the banks do not have to support more material than they are capable of.

This is done as a safety measure to prevent the excavated walls from collapsing inwards and trapping the construction workers. Rather than excavating a flat trench face benching leaves steps on the side of the excavation. These benches should have a gentle fall towards the hillsides.

If you are digging in loose soil a deep vertical trench wall is at risk of collapse. The requirements of this appendix apply when the design of sloping and benching protective systems is to be performed in accordance with the requirements set forth in 1926 652 b 2. The art of cutting side slopes in steps is called benching.

This appendix contains specifications for sloping and benching when used as methods of protecting employees working in excavations from cave ins. Benching is a method of preventing ground collapse by excavating the sides of an excavation to form one or more horizontal steps with vertical surfaces between levels. A benched excavation also called benching can be defined as a type of excavation that consists of a series of horizontal steps with near vertical surfaces between them.

This can either be found as a single bench at the bottom of the trench or a multiple bench system. The requirements of this appendix apply when the design of sloping and benching protective systems is to be performed in accordance with the requirements set forth in 1926 652 b 2. Work crews in the excavation are the minimum number needed to perform the work.