Abstract: To achieve curved jacking with a small clear span and long distance in a complex geology, pipejacking techniques, including speciallydesigned cutterhead and main machine, bipolar deviation adjusting and intelligent control system, as well as automatic guiding system, drag reduction using pasteslurry technology and sectional grouting, efficient slurry system, and strict slurry operation management are applied. Following results are obtained: (1) The slurry balance pipejacking machine can meet the requirements of longdistance and curved pipejacking construction, and the intelligent control system is convenient for equipment operation and project management. (2) The pipejacking friction is effectively reduced by combining highpressure paste slurry and the conventional sectional grouting of thixotropic slurry, and the actual jacking force is approximately 60% of the theoretical jacking force. (3) The automatic guiding system can achieve deviation adjustment with a small angle and range, thus ensuring successful pipe jacking. (4) The efficient slurry system and strict slurry operation management effectively overcome difficulties caused by a complex geology and small clear distance doublepipe jacking.

Key words: slurry balance pipe jacking machine, super , deep and long , distance pipe jacking, pipe jacking in rock, curved double pipe, automatic guiding, drag reduction by grouting, slurry circulation