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.
超长距离顶管管道上浮控制实施时机的研究
- Title:
- Research on the Implementation Timing of Pipe Floating Control for Ultra?long Distance Pipe Jacking
- 摘要:
- 为解决超长距离顶管在软弱地层管道上浮控制实施时机的难题，以武汉汤逊湖污水处理厂尾水排江工程两段超长距离顶管施工为对象，利用工程实测分析的方法，对不同控制措施下的管道上浮速率进行研究。结果表明，管道上浮峰值超过220 mm，采取管内动态压载、管顶加固、管内注放泥、启用中继间等处置措施有效，但最高点上浮速率最小值仍有10 mm/d，对顶管正常施工影响较大。基于第一段管道上浮区域控制结果，提出了顶管机出洞后平直顶进100 m，然后下调顶进轴线呈偏移设计轴线-90 mm，当管道上浮峰值达到120 mm开始动态压载的控制实施时机。结合工程监测数据，对优化后的上浮速率进行分析，结果表明，最高点上浮速率由5 mm/d降低至0.8 mm/d，满足施工要求。
- 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.
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