Design and Implementation of the South Hartford CSO Tunnel
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1 Design and Implementation of the South Hartford CSO Tunnel Brian Canterbury, P.E., AECOM James Sullivan, P.E., AECOM Andrew Perham, The Metropolitan District The Metropolitan District NEWEA January 22, 2018
2 The Clean Water Project 1. Expand HWPCF capacity to 200 MGD acres of sewer separation 3. Tunnel storage and conveyance 4. Reduce stormwater inflow/ groundwater infiltration (I/I) 2
3 South Tunnel Project Team Owner: The Metropolitan District Contractor: Kenny/Obayashi JV Design Engineer: AECOM / Black & Veatch Construction Manager: Jacobs Engineering / Parsons Program Manager: CDM Smith 3
4 Project Components: 4 miles long (21,800 LF) 18 foot internal diameter 50 MGD deep pump station 6 Intermediate Hydraulic Drop Shafts and Retrieval shaft 7,300 LF of Consolidation Conduits N 4
5 Typical Flow to Tunnel Odor Control Up to 3,000 LF Consolidation Pipe Diversion Structure ft Control Gate Chamber 5
6 Grit & Screening Facility Odor Control Facility Pump Station Control Building Launch- Screenings Shaft Tunnel Pump Station Shaft 6
7 Contract Packaging Bid Results Contract #2 (2/25/16): Kenny/Obayashi JV $279,400,000 Salini Impregilo/Healy JV $285,563,000 Traylor/Kiewit JV $298,275,000 JF Shea/Skanska JV $313,650,000 7
8 Schedule Key Dates: October 2015 Construction Began (Contract #1) August 2016 Contract #2 NTP Summer/Fall 2018 Tunnel boring begins Winter 2019 Tunnel drive completed 2023 Construction complete/facility in operation 8
9 9 The Tunnel/TBM
10 10 Regional Geology
11 Geologic Profile Bedrock Surface 11
12 Single Shield Hard Rock Tunnel Boring Machine (TBM) Named IRIS 12
13 Key TBM Components Segment Erector Thrust Cylinders 13
14 Probing and Pre-Excavation Grouting Ground protection when crossing fault zones Stabilization of loose material ahead of the excavation face Improvement of mechanical properties of the rock mass Sealing and stopping of groundwater inflows into the tunnel 14
15 TBM Cutterhead (video) 15
16 Launch Shaft and TBM Starter and Tail Tunnels Ground Surface Launch Shaft TBM Tunnel Tail Tunnel Starter Tunnel 16
17 17 TBM Delivered to Hartford
18 TBM Delivered to Hartford Thrust Cylinders 18
19 Tunnel Will be Lined with Pre-Cast Concrete Segments One-Pass Segmental Lining System Internal Diameter: 18 ft Ring Length: 5 ft 5+1 Universal Ring Geometry Advantages: o Negotiate Tight Curves o Requires Only One Set of Molds 19 Source: London Crossrail
20 Segmental liner Calcareous Concrete 100 year design life Concrete containing calcareous aggregate Selected as a measure to mitigate acid attack Coarse aggregate (Lime Stone) sourced from Thomaston, Maine. 20
21 Segmental liner Steel Fiber Reinforcement 21
22 Large Diameter Shafts Launch Shaft, Pump Station Shaft, and Retrieval Shaft
23 SITE PLAN Contract 2 Tunnel Pump Station Shaft 74 FT ID 230 Ft Deep Suction Header Pipe 4 FT ID Tunneled 200+ Ft Deep Launch-Screenings Shaft 39 FT ID 205 Ft Deep 23
24 SITE PLAN Contract 3 Control Building 54 Forcemain to HWPCF Headworks Head Tank Vortex Drop Shaft DS-7 Odor Control Grit/Screening Building 24
25 25 Main Work Site Summer 2016
26 26 Main Work Site January 2017
27 Main Work Site October 2017 Pump Station Shaft TBM and Trailing Gear on site Launch Shaft 27
28 28 Launch Shaft Secant Pile Guidewall January 2017
29 Secant Pile Drill Rig Bauer BG 39 Launch Shaft 29
30 Shaft Excavation 30 Launch Shaft May 2017 Tunnel Pump Station Shaft Sept 2017
31 31 CIP Concrete Ring Beam / Pump Station Shaft September 2017
32 Placing the Launch Shaft CIP Concrete Liner June
33 33 Pump Station Final Liner in Overburden
34 34 Launch Shaft - Drill and Blast Rock Excavation September 2017
35 35 Launch Shaft - Drill and Blast Rock Excavation September 2017
36 Bottom of excavation Launch Shaft January 2018 View of launch shaft from the top 36 Launch Shaft - January 2018
37 37 Rock Support for Starter Tunnel December 2017
38 38 Suction Header Tunnel January 2018
39 TBM Retrieval Secant Pile Guidewall August 2017 Talcott Rd (West Hartford) 39
40 Vortex Drop Shafts
41 Hydraulic Drop Shaft Construction Contract #2 41
42 Franklin Ave Drop Shaft #4 Site Preparation (484 Franklin Ave) South St 42
43 43 Casing Installation
44 Wirth Rock Recirculation Drilling (Franklin Ave. DS-4) Vent shaft Drop shaft 44
45 45 Rock Drill String Cutterhead for Wirth Rig
46 46 Drill String for DS-7 at Launch Shaft
47 47 Installing the Drop Shaft Carrier Pipe DS-7
48 Installing the Drilled Shaft Carrier Pipe (DS-7) Oct 2017 Carrier pipe during installation Installed Carrier Pipe 48
49 49 Field Application of Lining on Carrier Pipe Joints
50 Vortex Shaft Construction Status Overburden for all eight vortex drops and vent shafts have been drilled. Rock has been drilled for 9 of the 15 shafts/vents Carrier Pipe has been installed in 6 of the 15 shafts/vents. Deaeration Chambers and Adits to be installed from within the Tunnel 50
51 Questions?
52 52 TBM Factory Visit Herrenknecht AG, Schwanua, Germany
53 53 Franklin Ave. DS-4 Mixed Use/Residential Area
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