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• W66691738 abstract "Trenchless technology is a group of techniques whoseutilization allows for the installation, rehabilitation, and repairof underground infrastructure with minimal excavation from theground surface. As the built environment becomes more congested,projects are trending towards using trenchless technologies fortheir ability to quickly produce a quality product with minimalenvironmental and social costs. Pilot tube microtunneling (PTMT) isa trenchless technology where new pipelines may be installed ataccurate and precise line and grade over manhole to manholedistances. The PTMT process can vary to a certain degree, buttypically involves the following three phases: jacking of the pilottube string to achieve line and grade, jacking of casing along thepilot bore and rotation of augers to excavate the borehole to adiameter slightly larger than the product pipe, and jacking ofproduct pipe directly behind the last casing. Knowledge of theexpected productivity rates and jacking forces during a PTMTinstallation are valuable tools that can be used for properlyweighing its usefulness versus competing technologies andminimizing risks associated with PTMT. This thesis outlines theinstrumentation and monitoring process used to record jacking framehydraulic pressures from seven PTMT installations. Cyclic patternsin the data can be detected, indicating the installation of asingle pipe segment, and enabling productivity rates for each PTMTphase to be determined. Furthermore, specific operations within acycle, such as pushing a pipe or retracting the machine, can beobserved, allowing for identification of the critical tasksassociated with each phase. By identifying the critical tasks anddeveloping more efficient means for their completion, PTMTproductivity can be increased and costs can be reduced.Additionally, variations in depth of cover, drive length, pipediameter, and localized ground conditions allowed for trends injacking forces to be identified. To date, jacking force predictivemodels for PTMT are non-existent. Thus, jacking force data wascompared to existing predictive models developed for the closelyrelated pipe jacking and microtunneling methodologies, and theapplicability of their adoption for PTMT jacking force predictionwas explored." @default.
• W66691738 created "2016-06-24" @default.
• W66691738 creator A5040347336 @default.
• W66691738 date "2013-01-01" @default.
• W66691738 modified "2023-09-23" @default.
• W66691738 title "Pilot Tube Microtunneling: Instrumentation and Monitoring for Jacking Force and Productivity Analysis" @default.
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