Poling Boards ~ a form of temporary support which is placed in
position against the sides of excavation after the excavation work
has been carried out. Poling boards are placed at centres
according to the stability of the subsoils encountered.
Runners ~ a form of temporary support which is driven into
position ahead of the excavation work either to the full depth or
by a drive and dig technique where the depth of the runner is
always lower than that of the excavation.
Trench Sheeting ~ form of runner made from sheet steel with a
trough profile † can be obtained with a lapped joint or an
interlocking joint.
Water ~ if present or enters an excavation, a pit or sump should
be excavated below the formation level to act as collection point
from which the water can be pumped away.
Excavations up to 2.5 m deep---Temporary Support