Choreographing Deconstruction of Existing Basement Structure and Construction of SOE system.-PPT Presentation

PPT Presentation

Pdf Summary

The presentation outlines the demolition of One James River Plaza, a 22-story reinforced-concrete building at 700 Canal Street in Richmond, Virginia, and the construction of a new support-of-excavation (SOE) system. The existing structure had three basement levels extending about 35 feet below grade. Demolition used both implosion and mechanical methods to prepare for a new Dominion building with five basement levels and an excavation depth of approximately 55–60 feet.<br /><br />The work involved coordination among the deconstruction engineer and contractor, general contractor, and foundation contractor. Schnabel Foundation was responsible for the new SOE system. A central engineering issue was the interaction between the existing basement structure and the new earth-retention system, including the use of passive resistance.<br /><br />The presentation describes a staged demolition and excavation sequence. It includes installing new soldier piles, excavating between the piles and the existing wall, removing the plaza-level structure, and progressively demolishing basement walls and slabs as excavation advanced. The sequence also included preparing the B1 wall for installation of the first prestressed tieback, with moment and hinge connections considered in the structural details.<br /><br />Overall, the project demonstrates how careful sequencing and collaboration are essential when deconstructing an existing basement while installing support for a substantially deeper future excavation.

Keywords

demolition

support-of-excavation

reinforced-concrete building

Richmond Virginia

soldier piles

tiebacks

basement excavation

earth-retention system

staged demolition

passive resistance