Parsons - 2010 Construction Management for AWV.pdf - SCATnow

Assessing the risksBored Tunnel Alternative Design-Build ProjectDesign-Build Construction Management Services SR 99Key RisksA proactive plan of proper TBM selection and operation, coupled with asettlement mitigation plan, will eliminate potential settlement of some• Improperly designed or poorly selected methods causestructures and reduce settlement of others to acceptable levels. A mitigationstructure damage or do not arrest settlementand repair plan should also be in place prior to construction so that• Improperly applied methodsunforeseen settlement issues can be implemented in a timely manner. Many• Remedial methods not performed in a timely mannerof the associated risks and mitigations have been discussed above; however,a thorough understanding of the effects of ground behavior during tunneling, coupled with a full study of the structuresis required. Mitigation measures must be established for sensitive structures and contingency plans and equipment mustbe able to mobilize on short notice to prevent catastrophic results. Table E.8 provides a representative example of ourmethodology, acting as CM support to WSDOT, to mitigate these and similar project risks.Table E.8 Risk CM Role - Design and Pre-construction CM Role - ConstructionImproperly selected or poorlyinstalled methods• Improper ground improvementmethods are used, which areineffective or cause damageThe CM team must confirm that thedesign-builder:• Develops a comprehensive structuremonitoring and settlement mitigation planThe CM team must confirm that the design-builder:• Reviews all plans against structure analysis and geotechnical conditions to ensurethat proper methods are being applied• Reviews all plans and equipment to ensure that proper devices are used• Ensures that plans include redundant monitoring instruments, and thatinstruments are being monitored prior, during, and after work• Continuous inspection and monitoring of operations to ensure work plans are followed• Verify the effectiveness of the installation through coring, testing, and other means9System Integrator that Provides Oversight for Roadway and Tunnel Systems Expertise and Commissioning EffortsBenefits to WSDOT• System integrator was involved throughout the entire design-build process• National and international experience will allow innovative collaboration• Pre-construction team is the same as the design-build team - Up to speedwith WSDOT’s issues and local codes• Tunnel Resident Engineer and inspectors have systems and ventilationexperience• Mechanical systems modeled during the design-build phase and can beused during collaboration meetingsParsons used Building InformationModeling (BIM) to model the tunnelsystems and ventilation buildingsduring the SR 99 Design-Build pursuit.These efforts provide Parsons withunmatched insight to assist WSDOT inevaluating the design-builder’s designsubmittals, ensuring that all operationalrequirements are met.Transportation tunnels rely on a complex set of functional elements to maintain safe traffic flow, provide ventilation, ensurefire/life safety for passengers, provide emergency communications, and provide remote control of all tunnel systems. TheParsons team is experienced in integrating all of these elements into a functional system. We have retained our core teamof systems and ventilation specialists involved in the design-build pursuit to provide WSDOT with an “up to speed” teamknowledgeable in the project-specific operational issues. Doug Slakey, our Systems Integrator, will coordinate our teamof technical specialists, which includes Anthony Bates and Peter Woodburn. Doug has been thoroughly involved withthe SR 99 Design-Build project, as well as other complex projects including the Caldecott and the I-70 Hanging Lake Tunnelprojects. Anthony Bates brings 18 years of experience in design, installation, testing, and commissioning of tunnel systemsprojects, including the London Crossrail project, the Chongzun Expressway, and the Stonehenge Tunnel. Peter Woodburnis a specialist with 17 years of extensive experience in fluid mechanics analysis for a wide range of sectors, including firesafety engineering and ventilation. Greg Colzani has served as the Chief Inspector and Project Engineer for ventilationand systems contracts for the I-70 Hanging Lake Tunnel and the H-3 Trans-Koulau Tunnels projects. During construction,our Systems Integrator will monitor all related design-build activities including submittal reviews and factory acceptancetesting of equipment. He will also lead the verification of all design-build commissioning activities.43