| 摘要 |
PROBLEM TO BE SOLVED: To smoothly tow and bury an underground structure while preventing the pulsating movement and lateral meandering of the underground structure when towed in burying the underground structure under a track to form a passage by towing the underground structure in a direction to cross the ground under the track. SOLUTION: The underground structure is towed by a plurality of main towing jacks through PC steel wires and advanced and buried in a burying planned region under the track. At this time, tractive force by the towing jacks is applied to the underground structure as the force almost equal to dynamic friction resistance when moving the underground structure, and at the same time, both side parts of the rear end of the underground structure are towed by auxiliary towing jacks with tractive force not less than the difference between static friction resistance before moving the underground structure and dynamic friction resistance when moving the underground structure. The underground structure is thus moved forward while suppressing its pulsating movement, and the advance quantity of the right and left parts of the underground structure during forward movement is measured to correct the lateral direction of the underground structure by auxiliary towing means on both sides. COPYRIGHT: (C)2006,JPO&NCIPI
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