Timbering is the temporary support to the sides of excavations.
sometimes called planking and strutting.
The purpose of temporary timbering support to sides of excavations is :-
-To uphold the sides of excavation to avoid collapse of the sides
-To protect the operations while in the excavations
-To avoid the wasteful labour of constantly clearing falling earth from the excation bottoms
The material most used for temporary support for the sides of excavations for foundations is rough sawn timber . The timbers used are square section struts , across the width of the trench , supporting open poling voards , close poling voards and walings or poling boards and sheeting .