Project requirements: Responsible for of all of the micropile operations on this major retrofit project. The retrofit work involves strengthening all aspects of the substructure and superstructure of the bridge.
Ghirardelli Associates provides a lead bridge engineer in charge of all of the micropile operations on this major retrofit project. The micropile operations are an essential part of the substructure retrofit. The work involves coring through existing foundations and installing a 12 3/4 inch steel casing with an 8 5/8 inch reinforcing pipe, embedded 50 feet into bedrock at the bottom of the San Francisco Bay. The full length of the pile is pressure grouted and bonded to the existing foundation to provide tension and compression capacity during a seismic event. Since the micropile operations are underwater, all of the construction is performed from specially designed floating platforms with divers providing under water surveys. We provide technical leadership and supervision to a staff of 12 engineers and inspectors, and ensures that the micropile operations, which makes up over 10% of the construction cost, is completed to meet the contract plans and specifications and the design intent of the retrofit. We also resolve all claims, RFI's, construction and design issues and handles all CCOís related to the micropiles.
In addition, we provided an Assistant Structure Representative for the precast operations on this major retrofit project. Our portion of the work consists of inspecting precast products for the project at the Contractor's precast facility in Petaluma, CA and includes the installation of epoxy coated steel, concrete fabrication and quality assurance, drill and bond dowels, grout injection and pay estimates.
Services Provided: Bridge representative and bridge inspection.