注浆技术在京包铁路平改立工程中的应用

目前，随着铁路全封闭、立交化的推进，大量既有铁路通过箱涵顶进施工实施平改立工程，在保证既有铁路正常运营的前提下，注浆加固预支护技术成为箱涵顶进安全施工的保证。在对大跨度、高净空箱涵立交桥进行注浆预加固支护，施工中采用水泥-水玻璃注浆和施工工艺，确保了顺利穿越京包铁路，路基无溜塌、滑移等现象，使铁路正常运营快速恢复。

Application of Grouting Technology in Altering Grade Crossing to Flyover Crossing for Beijing-Baotou Railway

At present, as fully-closed and flyover railway are promoted, a large number ot existing rauways have altered grade crossing to flyover crossing through culvert jacking construction. On the premise of ensuing normal operation of the existing railways, grouting reinforcement pre-supporting technology has become the guarantee for culvert jacking safety construction. Cement ＋ soluble glass grouting and construction process have been adopted in grouting reinforcement pre-supporting construction of large-span, high-clearance culvert flyover, which successfully passed Beijing-Baotou Railway without subgrade collapse or sliding for rapid recovery of railway normal operation.