ZHENGPing,CUIXu-hui,LUHai-jun.Research on the Implementation Timing of Pipe Floating Control for Ultra?long Distance Pipe Jacking[J].China Water & Wastewater,2023,39(20):120-126.
Research on the Implementation Timing of Pipe Floating Control for Ultra?long Distance Pipe Jacking
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第20期
Page:
120-126
Column:
Date of publication:
2023-10-17
- Abstract:
- To determine the control timing of pipe floating for ultra-long distance pipe jacking in soft stratum, the floating rates of pipes under different control measures were analyzed through on-site monitoring based on two ultra-long distance pipe jacking sections of tailwater drainage project in Wuhan Tangxun Lake sewage treatment plant. The results show that when the floating peak value of the pipes exceeded 220 mm, the disposal measures such as dynamic ballast inside the pipe, pipe crown reinforcement, slurry injection and release inside the pipe, and intermediate jacking stations activation were effective. However, the minimum floating rate at the highest point was still 10 mm/d, which had a significant impact on the pipe jacking construction. Based on the floating control effect of the first pipe jacking section, a control timing was proposed for the pipe jacking machine is to jack 100 m in a straight line after launching, then adjust the jacking axis is to offset the design axis by -90 mm, and start the dynamic ballast when the pipe floating peak value reaches 120 mm. The optimized floating rate was analyzed based on the monitoring data. The results show that the highest point floating rate decreased from 5 mm/d to 0.8 mm/d, meeting the construction requirements.
Last Update:
2023-10-17