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Eglinton Crosstown LRT – Site Supervision

Service Performed
Detailed 24/7 supervision and engineering support for three SEM stations in soft ground; namely Laird, Avenue and Oakwood.
Commencement - Services
November 01, 2015
Completion - Services
December 01, 2021
Location
97 Front Street West
Toronto, ON M5J1E6
Canada
Geology description

Glacial depositional systems created a complex distribution of heavily overconsolidated till layers, separated by interstadial stratified deposits of glaciolacustrine clay, silt, and sand.

Geology types
Description

The Crosstown is a light rail transit line, which is part of the regional transportation plan for the Greater Toronto and Hamilton Area. The project will provide a 19km corridor across Eglinton Avenue, connecting ten stops and 15 underground stations with a 10km twin-bored tunnel. Dr. G. Sauer & Partners provided detailed design for Laird, Avenue and Oakwood stations. A combination of Cut-and-Cover construction for the shafts and mined technique (SEM) for the tunnels has been utilised. The 24/7 supersvision services provided engineering support, detailed inspection and documentation by a team of eperts for each of the three stations.

Activity
Construction methods
Tunneling under
Building, Road
Route map (www.thecrosstown.ca)
Laird Station Excavation
Project number
467E
Project Type
Final cost
$8.25 billion CAD

Bank SCU - Design CAT3 Check

Service Performed
Category 3 design checking of temporary timber heading works and permanent square works structures.
Commencement - Services
March 01, 2013
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits comprising river terrace deposits and alluvium which are generally overlain by made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five lines. The Bank Station Capacity Upgrade (BSCU) aims to relieve heavy passenger congestion during peak hours for boarding, alighting and interchange. The capacity upgrade comprises the construction of a new southbound platform tunnel and associated length of running tunnel for the Northern line, connecting passageways to the existing station tunnels, and the provision of step-free access from King William Street. The total length of tunnels is 1,300m with tunnel cross sections that range from 10m2 up to 90m2.

Activity
Construction methods
Tunneling under
Building, Road
BSCU project overview
3D render of existing and new structures
Project number
451D1
Project Type
Final cost
£563.8 million GBP
Completion date
Ongoing

East Side Access - Manhattan Tunnels

Service Performed
Design of tunnel support measures in rock mass.
Commencement - Services
April 01, 2007
Completion - Services
July 01, 2019
Location
Manhattan Tunnels
New York City, NY NY 11354
United States
Geology description

Manhattan schist

Description

The East Side Access (ESA) project provides new Long Island Rail Road services to the east side of Manhattan, supplementing the existing service to Penn Station on Manhattan's west side and Atlantic Terminal in Brooklyn. ESA will serve approximately 162,000 customers a day, providing a faster and easier commute to the east side of Manhattan in a new 8-track terminal and concourse below Grand Central Terminal. The project encompasses more than 13 km of tunnelling.

Activity
Construction methods
Tunneling under
Building, Rail
East Side Access project overview (web.mta.info)
East Side Access Running Tunnel
Project number
405D
Project Type
Final cost
$12 billion USD (All East Side Access tunnels)

Ottawa Light Rail Transit - Execution

Service Performed
Site supervision services, engineering support and monitoring assessment. 24/7 presences on site to facilitate RES process and implement design requirements on site.
Commencement - Services
February 01, 2012
Completion - Services
January 01, 2019
Location
259 Albert Street
Ottwa, ON K1R 7Z0
Canada
Geology description

The geology varied between competent limestone and fractured shale. A soft ground section included variable glacial till deposits of sand, silt and clay layers and a groundwater table close to ground surface.

Geology types
Description

Ottawa's Confederation Line runs from Tunney's Pasture station in the west to Blair station in the east, is 12.5 km long and includes 15 stations. The central piece is a 2.5 km long tunnel, running under the central business district of the city and including three underground stations. The twin track running tunnel and the three underground stations were constructed using the mined construction method in order to minimise surface disruption. The underground stations are located directly adjacent to existing, sensitive and sometimes historic buildings and required strict adherence to design and risk mitigation processing during construction. The Dr. Sauer on site team supported the contractor to meet these requirements.

Activity
Construction methods
Tunneling under
Building, Road
Station cavern and running tunnel construction underway
Excavation of station cavern complete with tension ties visible
Project number
123E
Project Type
Final cost
$2.1 billion CAD

Walthamstow Central Station Capacity Upgrade (WCSCU)

Service Performed
Ground movement impact assessment and conceptual design of four structures connecting a new station box with the existing Victoria line platform tunnels.
Commencement - Services
April 01, 2019
Location
55 Broadway
London
SW1H 0BD
United Kingdom
Geology description

London Clay.

Geology types
Description

The WCSCU project will deliver additional capacity and step free access to the Victoria line at London Underground's Walthamstow Central station. A new station box will provide a new station entrance, a new subsurface ticket hall and connecting routes to both Victoria line platforms via escalators, stairs and lifts. Four new tunnel structures will connect the new station box with the segmental cast iron lining of the Victoria line platform tunnels. The use of traditional timber headings was chosen as the preferred construction method during conceptual design primarily due to the length of the structures (i.e. approximately 2 m each).

Activity
Construction methods
Tunneling under
Building
3D View showing the four proposed connection structures
A construction stage of the timber heading structures
Project number
512C
Project Type
Final cost
£15 million GBP
Completion date
Ongoing

Bank Station Capacity Upgrade - Site Supervision

Service Performed
Design of tunnels and shafts (primary lining, waterproofing and secondary lining). Design representation on site during construction
Commencement - Services
August 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) aims to relieve heavy passenger congestion during peak hours for boarding, alighting and interchange. The capacity upgrade comprises the construction of a new southbound platform tunnel and associated length of running tunnel for the Northern line, connecting passageways to the existing station tunnels, and the provision of step-free access from King William Street. The total length of tunnels is 1,300m with tunnel cross sections that range from 10m2 up to 90m2.

Activity
Tunneling under
Building
Hybrid SCL and squareworks structures
Exposure of live LU asset (existing cast iron platform tunnel shown)
Project number
451E
Final cost
£563.8 million GBP

Bank Station Capacity Upgrade - Pile Interceptions

Service Performed
Design of tunnels where they intercept with existing building foundation piles (i.e. at four building locations).
Commencement - Services
August 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. The capacity upgrade includes the construction of 540 metres of running tunnel intercepting with existing foundation piles at four no. building locations. A bespoke solution was developed for each of the buildings and the building impact was assessed in detail.

Activity
Construction methods
Tunneling under
Building
Running tunnel intercepting with existing foundation piles
Exposure of pile during running tunnel construction
Project number
451D
Final cost
£563.8 million GBP

Bank Station Capacity Upgrade - Defects Survey

Service Performed
Defects surveys of the London Underground existing facilities predicted to settle 1 mm or more due to the planned station upgrade works.
Commencement - Services
August 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. Defects surveys of the LU existing facilities predicted to be impacted by the BSCU works had to be carried out before construction started. All existing facilities expected to be within the 1 mm settlement contour were inspected for defects.

Activity
Service areas
Construction methods
Tunneling under
Building
Defects survey in the existing running tunnel
Defects survey on the existing station platform
Project number
451C1
Final cost
£563.8 million GBP

Bank Station Capacity Upgrade - Impact Assessment

Service Performed
Assessment of the impact on existing cast-iron and precast concrete tunnel linings (in total approximately 300 assets.) including empirical and finite element calculations.
Commencement - Services
January 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits comprising river terrace deposits and alluvium which are generally overlain by made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. A staged, risk-based approach was used to efficiently assess the affected existing assets and determine an appropriate mitigation and monitoring scheme. Empirical methods and complex numerical models were used at the different stages of the assessment, to understand the risk to the existing railway and how they could best be managed while minimizing disruption to the station and its users.

Activity
Service areas
Construction methods
Tunneling under
Building
Existing escalator at Bank Station
FE model of existing (green) and new (red and pink) structures
Project number
451D_1
Final cost
£563.8 million GBP
Completion date
Ongoing

Ottawa Combined Sewage Storage Tunnel (CSST)

Service Performed
TBM segmental lining design, rock mass grouting design and engineering support services during construction. Value engineering efforts helped increase TBM tunnelling performance by reducing probing ahead.
Commencement - Services
February 01, 2016
Completion - Services
February 01, 2020
Location
110 Laurier Avenue West
Ottawa, ON K1P 1J1
Canada
Geology description

The alignment of the tunnels mainly crosses limestone formations with laminated black shales of varying thickness. The rock is overlain by glacial till, glaciofluvial deposits and fill.

Geology types
Description

The CSST project is part of the Ottawa River Action Plan to greatly reduce the frequency of sewage overflows during storms entering the Ottawa River. The tunnels will hold up to 43,000 m3 of sewage overflow which will be treated and returned to the river gradually. The project comprises design and construction of two TBM tunnels running east-west and north-south along 6.2 km in total, and multiple shafts and support buildings such as odour control facilities. Dr. G. Sauer & Partners supported the contractor with the feasibility study on TBM utilisation. Reduction of probe drilling requirements increased TBM excavation rates, by pre-excavation grouting criteria justification amongst others.

Activity
Categories
Final cost
$232,000,000
Construction methods
Special Construction techniques
Tunneling under
Building, Road
Overview plan of the CSST   (http://ottawa.ca)
East West Tunnel under construction (3m tunnel ID)
Excess wet weather flow is sent to the CSST (http://ottawa.ca)
Project number
481C
Final cost
$232 million CAD
Completion date
Ongoing

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