Anacostia River Tunnel Design/Build Project Washington, DC
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1 Anacostia River Tunnel Design/Build Project Washington, DC Shane Yanagisawa Project Manager Impregilo Healy Parsons JV
2 Stakeholders
3 Main Components: 29km of tunnels from 7m to 5,5m diameter Drop shafts and adits Diversion structures from existing sewer to tunnels Ventilation Control Facilities Green Infrastructure
4 System Overview * 30m below ground 7m dia. tunnel *When the entire Anacostia River tunnel system is complete
5 Anacostia River Tunnel
6 Anacostia River Tunnel System Profile
7 Tunnelling 7m dia. tunnel x 3,8km excavated with an EPB TBM 7m dia. tunnel x 30m excavated with Sequential Excavation Method 3m dia. tunnel x 100m excavated with pipe jacked slurry MTBM 1,4m dia. adits excavated with pipe jacking
8 Sustainability Initiatives Design/Build Phase 100-year design life Careful management of aquifers Reduction of carbon footprint Preserved integrity of all existing infrastructure Implemented storm water pollution prevention measures
9 Minimum 100 Year Design Life Designed all structures, including precast tunnel liner and cast-inplace structures, for minimum 100 year design life
10 Shaft Construction with Slurry Walls to Protect Lower Aquifer Placing Concrete for Guide Walls Hydromill for Slurry Wall Panel Excavation Primary Panel Rebar Cage Fabrication Placing Rebar Cage for Slurry Wall Panel Preparing Top of Slurry Wall for Capping Beam Installation Shaft Excavation Shaft Bottom Concrete
11 Reduced Carbon Footprint Use of fly ash in precast concrete segments to provide 100 year durability and reduce carbon footprint by reducing cement consumption
12 Preserved Integrity of Existing Infrastructure
13 Protected Fragile Key Infrastructure Including pressurized sewer and water mains by compensation grouting as TBM passed underneath
14 Sustainability Initiatives Operations Phase Access to shaft sites via green infrastructure Hydraulic design of interceptor drop shafts, designed to operate without active control and absorb the energy of the water dropping 30m Ventilation/odor control structures below ground for minimal visual impact Reduction of CSO overflows to the Anacostia River for improved water quality
15 Access Shaft Sites Via Green Infrastructure Provide turf pavers for access to shaft sites instead of impermeable pavement
16 In-line Drop Shaft Design Constructible solution for soft-ground Minimize air entrained in the drop Allow air to vent from tunnel system Provide space for hydraulic transients to overflow Provide a relief for flows that exceed the design diversion rate Mitigate potential for geysers
17 In-line Drop Shaft Design DROP PIPE SURGE RISER (EQUAL TO DIA. OF TUNNEL) 15 TO 20m SHAFT PARTITION WALL DEAERATION CHANNEL 7m DIA. TUNNEL ORIFICE BAFFLE WALL DRAIN PLUNGE POOL
18 In-line Drop Shaft Video
19 Venting and Odor Control Ventilation Vents sized for maximum air flow to be exhausted during filling events COUNTERWEIGHTED DAMPERS RESIST NUISANCE DRY WEATHER AIR CIRCULATION LARGE AIRFLOWS DURING FILLING EXPELLED VIA BAR GRATING AT GRADE Maximum air velocity at grade limited to prevent nuisance Odor Control Tunnel accepts wet weather flows only Tunnel pumped down during and after storm events DROP SHAFT ODOR CONTROL UNIT PROVIDES NEGATIVE PRESSURE IN SHAFT, TREATMENT FOR MINOR DRY WEATHER AIR CIRCULATION Counterweighted dampers prevent air circulation Radial flow activated carbon system at all shafts TUNNEL AIR FLOW ` COUNTER BALANCE ASSEMBY LINKAGE
20 Venting and Odor Control TUNNEL ACCESS POINT: REMOVABLE CONCRETE SLABS VENT OPENING BACKDRAFT DAMPERS (EXHAUST AND INTAKE) BAR GRATING AT SURFACE
21 82% Reduction of CSO to Anacostia River in Spring 2018 after startup of the Anacostia River and Blue Plains Tunnel Projects
22 DC Clean Rivers Project Benefits (DC Water Formed) % Reduction Total System
23 Clean Rivers Project: Sustainability Initiative of the 21 st Century for Washington, DC
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