仰拱台车施工技术在大伙房输水工程TBM2标的研究与应用

Case Study on Invert In-situ Casting Technology Applied in No.2 TBM Bored Contract Section of Dahuofang Water Diversion Project

为解决辽宁省大伙房水库输水一期工程二次衬砌施工进度与TBM快速掘进相匹配这一问题,降低TBM工厂化作业施工成本,通过对TBM施工配套仰拱台车施工方案与仰拱预制块施工方案的对比论证,最终选择了与传统施工工艺所不同的仰拱台车施工方法,确定了现浇仰拱施工组织形式及施工工艺的研究、仰拱模板台车及其它配套机具的研发、洞内施工运输组织的优化以及现浇仰拱混凝土施工质量控制等关键性问题。仰拱台车制造成功后,通过试验段的检验,先后解决了仰拱台车及配套机械的流水线作业、台车整体上浮、长距离单线运输、冬季混凝土施工质量控制及渗漏水段衬砌施工质量控制等问题,实现了TBM开挖仰拱衬砌施工的高效快速、降低了TBM工厂化作业的施工成本。

In order to achieve good matching between the secondary lining construction and the rapid TBM boring in the first stage of Dahuofang Water Diversion Project in Liaoning province and to minimize the construction cost of TBM-bored tunnels, invert formworks trolley construction method, i. e. , invert in-situ casting method, is adopted on basis of com- parison and contrast between invert formworks trolley construction option and prefabricated invert segment construction option. The study on the invert formworks trolley construction method includes the following topics： （a） Study on the construction organization and construction technology of in-situ tunnel invert casting ; （b） Development of the tunnel invert formworks trolley and the matching equipment ; （c） Optimization of the transportation system inside the tunnel ; （d） Quality control of in-situ cast concrete of the invert. When the manufacture of the invert formworks trolley is completed, the invert formworks trolley is put into trial operation. In the end, good solutions have been achieved to such issues as the production line of tunnel invert formworks trolley and the matching equipment, the uplift of the invert formworks trol- ley, long-distance single-track transportation, concrete quality control in winter and lining construction in seeping area. Owing to the construction method adopted, the installation of the invert for the TBM-bored tunnel is executed with high speed and high efficiency and the construction cost of the TBM-bored tunnel is reduced.