FOUNDATIONS

 

 

COAST MERIDIAN OVERPASS 

 

Challenges

  • Installation of the foundation caissons and construction of the piers required the use of large equipment in constricted working areas. Each pier had a specific footprint in which equipment could be placed, between operating tracks, in some cases as narrow as 15 meters.

  • Access to each pier was also limited to maintenance roads with travel distances of over a kilometer.

  • Site specific methodologies and safety plans were developed in conjunction with the CPR Safety Requirements for each pier

  • A main sewer Interceptor near the North end of the site was partially relocated to accommodate one of the piers.  To ensure the integrity of the sewer line and to mitigate environmental risks, the area was isolated with a temporary sheet pile enclosure.

  • Work safety was important due to the always present danger of moving trains.  Safety plans specific to each work site location were developed in conjunction with CPR safety officials.

LOCATION  Port Coquitlam, BC 

OWNER   City of Port Coquitlam

COMPLETED  December 2008

VALUE  $4M

 

This project was for construction of a major overpass crossing the CP Rail yard and Lougheed Highway in Port Coquitlam.  Access on site for pile driving and pier construction was limited to a small area only at each of the 4 main pier locations.  Due to these restrictions, the Prime Contractor made the decision to launch the superstructure from above the piers.

 

Scope of Work included

  • Installation of 19 – 2000mm dia. pipe piles for the main piers.

  • Installation of 33 – 914mm dia. pipe piles at the 2 abutments.

  • All piles were driven to a depth of approximately 36m.

  • The interior of all piles were augured out and filled with concrete and rebar to a depth of 20m.

  • Piles were installed initially with an APE 600 vibratory hammer then driven to refusal with an APE D-180 Diesel Hammer. 

 

THURLOW/CORDOVA VIADUCT CONSTRUCTION  

 

LOCATION  Vancouver, BC 

OWNER   Marathon Developments Inc.

COMPLETED  January 2003

VALUE  $5M

 

The Thurlow/Cordova Viaduct is a very significant piece of infrastructure which spans the ALRT lines and allows vehicle and pedestrian traffic access to the South Shore of Coal Harbour from the downtown Vancouver core.

 

The project relied upon the services of several of the members who make up the GIG joint venture. Fraser River Pile and Dredge was the General Contractor.  Kingston Construction was a major subcontractor on the job responsible for constructing the concrete deck and superstructure elements.  Support for the elevated structures was achieved by installing sixty-two 1220mm diameter drilled shaft caissons to a depth of 20m anchored into the underlying bedrock.  The overlying soils consisted of variable fill materials and marine sediments.

 

GIG’s scope of work included

  • Installation of 62 drilled, rock socketed caissons

  • Caissons were 1,220mm diameter up to 20m in length

  • 62 concrete columns 12m above ground line

  • Supply and placing of 2,900 cubic meters of concrete in elevated pile caps on the viaduct columns

  • Supply and placement of 86 precast concrete ‘I’ girders

  • Supply and placement of 492 precast concrete deck panels

 

The project was completed while maintaining uninterrupted SkyTrain service on the tracks below.  This necessitated careful and constant coordination between SkyTrain operators and the General Contractor on site. 

 

The work was carried out immediately adjacent to Coal Harbour requiring extensive planning and implementation of a detailed Environmental Management Plan to ensure that the integrity of the marine ecosystem was maintained.

 

 

Challenges 

  • Large pile caps were in order to span the LRT tracks and support the deck and superstructure.  Due to the proximity of the tracks and tight working conditions, unique false work solution was required, which was accomplished by installing temporary support piles and a series of multi-tiered beams and intermediate supports.

  • Sequencing of the work was critical while working in this narrow confined work space in order to maintain access for equipment and material deliveries.   Unique girder erection schemes were devised using smaller cranes for dual crane picks.

  • Constructed in a very congested area of downtown Vancouver.  Pedestrian and vehicle traffic were not detoured; however, strict measures were implemented, isolating the work site to ensure public safety.

  • Detailed Quality Control/Assurance plans were developed and adhered to for the project.  Oil leaks or spills were considered a risk since the work site was adjacent to an extremely sensitive aquatic environment. Work plans were developed to eliminate any such incidents.  The team managed complex environmental issues such as fisheries mitigation / compensation, and sediment and erosion control.  No such environmental issues occurred.

CANADA LINE RIVER CROSSING - BRIDGE FOUNDATIONS   

 

LOCATION  Fraser River, BC 

OWNER   SNC-Lavalin

COMPLETED  February 2007

VALUE  $22M

 

Fraser River Pile & Dredge Ltd. was awarded a contract in 2005 by RSL Joint Venture to construct the major pier foundations for 2 bridges crossing the Fraser River to Richmond and Vancouver Airport which would support the Canada Line light rapid transit line.

 

The Scope of Work included the following activities which were successfully completed approximately 3 months ahead of schedule.

  • Design and construction of 3 precast concrete floating structures to facilitate pile installation and act as formwork for construction of the 3 main piers located in the river.  

  • Installation of 40 – 2000 diameter pipe piles ranging in length from 25 to 65 meters.  All of the work had to be carried out under NAV Canada guidelines for YVR flight path clearance which were extremely restrictive. 

 

Challenges 

  • confined working area, train traffic control management

  • two major river crossings with high volume marine traffic

  • mitigation of environmental impacts to permit work through D.F.O. closures