,Connecting passage,Horizontal freezing hole,Gravel strata," />
Construction Technology for Horizontal Freezing Holes in Metro Connecting Passages in Gravel Strata
Abstract Based on the engineering practices of the connecting passages of the Kunming North Railway Station Metro Project, the key and difficult points in organization and construction procedures for freezing holes are summarized, and the construction procedures and key technologies for horizontal freezing holes in gravel strata are introduced. The technologies for qualified drilling construction and drill hole inclinometry are presented after an analysis of the cause of drilling deviation of freezing holes. Simultaneous grouting for filling some local caves of the connecting passage should be intensive during the construction of the freezing holes, improving the safety of both the connecting passage and the surface buildings and preventing caves from collapsing.
Abstract：
Based on the engineering practices of the connecting passages of the Kunming North Railway Station Metro Project, the key and difficult points in organization and construction procedures for freezing holes are summarized, and the construction procedures and key technologies for horizontal freezing holes in gravel strata are introduced. The technologies for qualified drilling construction and drill hole inclinometry are presented after an analysis of the cause of drilling deviation of freezing holes. Simultaneous grouting for filling some local caves of the connecting passage should be intensive during the construction of the freezing holes, improving the safety of both the connecting passage and the surface buildings and preventing caves from collapsing.
.Construction Technology for Horizontal Freezing Holes in Metro Connecting Passages in Gravel Strata[J] MODERN TUNNELLING TECHNOLOGY, 2013,V50(6): 189-194
2013, Vol. 50 