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- W2067200793 abstract "An operator's skill to steer micro tunneling machine is important to maintain driving within line and grade tolerances. It is also important to minimize rapid or erratic changes when steering a microtunnelling machine. This paper presents a way to evaluate the machine steering quality of operator by recording the shield machine's positions, strokes of steering hydraulic jacks, and pitch and roll values from pipe to pipe. Since the steering ability of shield machine and soil type are also important factors to influence the microtunnelling alignment. The field data are collected from various projects in which three brands of shield machines are used to drive in various ground, such as gravel formation, clay deposit, sand deposit and hard bedrock. The average deviation is evaluated from the integration of each pipe's deviation along the shield machine's traces divided by the total pipe length. The average adjustment of shield machine is evaluated from the integration of all the adjustments along the line divided by the total pipe length. It can be concluded that the average vertical or horizontal deviation is proportional to the average vertical or horizontal adjustment of steering jacks when the operator is steering shield machine in a normal and smooth conditions." @default.
- W2067200793 created "2016-06-24" @default.
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- W2067200793 date "2011-05-16" @default.
- W2067200793 modified "2023-10-17" @default.
- W2067200793 title "Steering Efficiency of Microtunnelling in Various Deposits" @default.
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- W2067200793 doi "https://doi.org/10.1061/47632(411)5" @default.
- W2067200793 hasPublicationYear "2011" @default.
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