Project Details

Heavy Civil and Structural Project for Redundancy Utility Loop Bethesda, Maryland

Client

National Institutes of Health Bethesda, Maryland

Scope

Civil, structural, architectural work
Excavation
Cast in place concrete
Micro-pile and pile-cap foundation systems
Directional boring
Structural steel
Planning/coordination for utility shutdowns and utility tie-ins
Traffic control
Interior/exterior building finishes

Project Value

$4,980,000

Project Description

Scope of work consisted of civil, structural and architectural packages for new redundant chilled
water and steam piping systems. Work was performed inside of Building 10 as well as at loading docks B1 and B2. Major coordination was required for shutdowns, utility tie-ins, traffic control and barricades for pedestrian walkways. Also included was the design and construction of a (1,300 square foot) sub-grade concrete vault with 18” thick walls. The vault was constructed under an existing pedestrian tunnel. As such, Kimball’s project team designed and constructed a support system that utilized angle-pile driven adjacent to the perimeter of the tunnel, with steel beams across the top. The weight of the tunnel was distributed across the pile by anchoring the top of the tunnel to the beams using threaded rods. For support of the new vault beneath the tunnel and 30 feet below the finished pavement, Kimball’s team designed and constructed a micro-pile and pile-cap foundation system. Installation of the new utility vault required the relocation of an existing water line, gas line and 10” storm drain. The latter, required directional boring under the existing tunnel.