Research purposes: Due to the great adverse impact on the surrounding environment, it is not suitable to adopt dewatering in the construction of the mined tunnels of Tianjin Metro. Therefore, grouting is one of the major assisting construction methods adopted in Tianjin Metro. However, step-by-step grouting must be adopted so as to ensure the quality of the grouting construction. In order to overcome such disadvantages as difficult grouting hole drilling, large size of the drilling machines, easy deformation of the PVC grouting ducts and high cost of step-by-step grouting, Therefore the studies of TSS grouting technology is extremely essential.
Research methods: TSS grouting ducts and accompanying equipment are developed and proper grouting parameters, grouting process and grouting techniques are determined. Research is carried on by means of application of TSS grouting technology in the construction of the mined tunnel of No. 1 ventilation room of Yingkoudao station of Tianjin Metro.
Research results: The techniques of single-direction sleeve-valve grouting ducts of small diameter are mastered.
Research Conclusions: Due to such advantages as step-by-step and controllable grouting and simple operation of TSS ducts, uniform ground consolidations and excellent water sealing effects are achieved, application of TSS grouting technology in Tianjin Metro results in higher construction progress and reduced construction cost.
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