| 摘要 |
An earth retention system constructed with a top-down process that can be used for permanent below-grade structures, similar to a "soldier beam and lagging wall," consists of vertical soldier piles, drainage and waterproofing, and a finished, reinforced concrete facing. The concrete facing is placed pneumatically (i.e., using so-called shotcrete). The system is well-suited to constructing below-grade portions of buildings where excavation lay back is not practical or cost effective and can incorporate permanent lateral support from tieback anchors. The below-grade structure is constructed by excavating down part way, constructing a waterproof "lift" portion of the ultimate structure, excavating down another part way, constructing another waterproof lift portion in a manner to be tied in with the lift portion immediately above, and repeating these steps until the below-grade structure is constructed to the desired depth. |
