dc water 1st street tunnel divp_adamsstmtbm_handout 2016 02 11
TRANSCRIPT
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Thursday, February 11, 2016
DC CLEAN
RIVERS
PROJECT
First Street Tunnel
Hand ‐Delivered Information Packet for
Neighbors Residing Adjacent to or Near
the Adams
Street
and
Flagler
Place
Construction Staging Area
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Purpose of this Packet
Update readers on the overall project schedule
Inform residents about the types of activities and generaltime frames for the remaining activities, including
The use of a micro-tunnel boring machine (MTBM),
named Abigail , to make the underground connection(adit) to the First Street Tunnel under Adams Street
Completion of the diversion chamber and interior
structures in the drop shaft and adit Restoration of disturbed areas
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Purpose of this Packet, continued
Heavy construction activities will continue through March 2016
During April through June, the contractor will work within the newstructures, demobilize the work area at the corner of First and AdamsStreet, and, if possible, shrink the east side of the ConstructionStaging Area on Adams Street to First Street
Demolition of selective secant piles to accommodate surfacerestoration and utilities. This will be a very noisy activity occurringintermittently during March, April, and May 2016. We will continue tomonitor noise levels and adjust activities as needed to comply with
contract and code limits. Most of the Adams and Flagler CSA will remain closed off, and the
street will remain closed until the contractor’s equipment isdemobilized and disturbed areas are restored
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Long-Range
Construction ScheduleWe are 78% complete!
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Current and Future Activities at the Adamsand Flagler Construction Staging Area
Mobilize supplies and equipment for the micro-tunnel boring machine
(MTBM) in February 2016, with mining to continue through March 2016
Continue construction of near surface structures through May 2016
Delivery of concrete and other equipment will continue using Flagler Place
Residents will see and hear different types of construction activities
for the MTBM operation
that are described in
detail on the following
slides
5Typical slurry treatment plant.
11 feet
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Adams and Flagler IntersectionConstruction Staging Area
Building entranceConstruction traffic entrance/ exit
CSA
CWZ
Road Closed ‒ No thrutraffic. Local accessonly at intersection ofFirst Street and AdamsStreet).
AbbreviationsCSA ‒ Construction Staging Area
CWZ ‒ Construction Work Zone
FEMS ‒ Fire and EMS Department
CSA
CWZ
FEMS Access Zone
4’-wide Pedestrian SidewalkLocal Traffic
14 feet
55 feet
Fire department
ladder truck clearances
Legend
F l a g l e r P l
Adams St
The north side (in pink) ofthe Adams Street CSA will
be used for trucks, cranes,workers, and FEMS access.
The south side (in gray) ofthe Adams Street CSA will beused for stationary equipment;
shown as . This equipmentis temporary while the adittunnel is being constructed;completed April 2016.
Vent PlantSlurryTreatment Plant
Centrifuge
Polymer Mix Transformer
7 8 9 10
Pipes 7,8, 9,10
Electrical Pad
160'
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Concrete barrier
with 6-foot-highchain link fence
8-foot-high chain linkfence all around
Adams Street NW
7
N
Freeze pipes installed at the corner ofFirst and Adams where adit tunnelwill connect to First Street Tunnel.
Concrete barrier with6-foot-high chain link fence
Open North-Southsidewalk to pedestrians
F i r s t S t r e e t N W
Once the adit connection is made
to the First Street Tunnel, the areaat the corner of Adams and First
Streets will be disassembled thenrestored to pre-construction
conditions.
Traffic sand drum
Adams and First Intersection
Construction Work Zone
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
Micro-tunnel Boring Machine (MTBM)
Starter Chamber (De-aeration Chamber) MTBM Launch
Connection to the First Street Tunnel
Adams Street Adit
The following pages contain diagrams, sequencing,
and photos. This information was compiled to
illustrate how
the
micro
‐tunnel
will
be
constructed,
and equipment used to assemble and operate the
MTBM under Adams Street.
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
Adams Street Adit – Typical Micro-tunnel Setup
Above-ground
Below-ground
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
Adams Street Adit (AS-A)
84" RCP Storage
MTBM Control Unit
Bentonite/Vent Plant
Slurry Treatment Plant
7'‐6" I.D.SEM Chamber
(Sequential Excavation
Method)
4'‐11" I.D.
Above-ground
Below-ground
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 1
1. Install f reeze pipes
2. Initiate freeze
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 2
1. Excavate shaf t
2. Line shaft
3. Start adit SEM excavation
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Completed!
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 3
1. Complete starter adit SEM excavation
2. Freeze AS-A connection zone
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 4
1. Flow/foam f il l AS-A
2. Turn off shaft/starter freeze
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Completed!
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 5
1. Construct First Street Tunnel
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 6
1. Construct Reception Adit1. Construct Reception Adit for MTBM
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Completed!
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 7
1. Construct micro-tunnel into reception adit
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 8
1. Push MTBM into FST. Recover MTBM.
2. Grout carrier pipe annulus
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
AS-A Construction Sequence – Step 9
1. Complete concrete at FST connection
2. Complete invert in de-aeration chamber
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
MTBM Pipe Jacking
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First Street Tunnel
Skanska-Jay Dee a Joint Venture with Parsons Brinckerhoff
DC Water
MTBM Slurry Plant & ControlsSecurity and Safety within
Construction Staging Areas The Construction Staging Areas
house large trucks, construction
equipment, and tools and have
deep, open excavations
Reminder: Construction Staging
Areas are closed to the public
Security personnel are onsite during
off hours
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To better ensure your safety and the
safety of your children and pets, do
not enter a Construction Staging Area.
Fencing signage at around aConstruction Staging Area.
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For Questions, Call theFirst Street Tunnel Hotline
If you have any questions about the work described,
please call the 24/7 FST Hotline at 1-844-FST-INFO
(1-844-378-4636)
Please Join Us! The next Tunnel Forum Meeting is onThursday, March 24 at 7 PM, at St. George’s Episcopal
Church
Check the project website for updates at:www.dcwater.com/workzones/projects/first_street_tunnel
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