Precast Concrete Panels used as Surface Lining of Perimeter Surfaces of Excavations

摘要

#$%^&*AU2016204976A120180201.pdf#####26 ABSTRACT A system for lining a perimeter surface of an excavation; the perimeter surface defined by a solid structure; the perimeter surface lined by means of precast concrete panels which are affixed to the solid structure.2/20 C (NO Y I ~ro 70