京津城际轨道交通工程垫层砂浆的生产与质量控制

京津城际轨道交通工程是我国第一条设计时速350km的高速铁路，采用无砟轨道结构形式，垫层砂浆是此轨道结构的缓冲层，其力学性质直接关系到轨道的平顺性与精确度：根据实际施工经验，对垫层砂浆的生产过程、灌浆过程以及垫层砂浆的质量控制进行了研究。垫层砂浆生产过程的质量控制主要集中在砂浆车生产和原材料两个方面；灌浆过程要集中解决灌浆也砂浆下沉问题、轨道板上浮问题以及砂浆结块问题；此外还提出了垫层砂浆的质量鉴别方法。

Production and Quality Control of the Bedding Mortar in the Beijing-Tianjing Inter-city High-Speed Railway Project

The Beijing-Tianjing Inter-city High-Speed Railway is the first high-speed railway over 350 km in our country. It adopts the structure of unballasted track. The bedding mortar is the cushion layer of the railway structure, so its mechanical characteristic is directly related to the railway＇ s smoothness and accuracy. Based on the real engineering experience, the quality control of the production process of bedding mortar, grouting process and bedding motor were studied. The quality control of the production process mainly concentrated on the motor truck production process and the materials; in the grouting process much attention should be paid to the problems of motor sink, the floating of the rail board and the agglomeration of the motor; finally the methods to discriminate the quality of the bedding motor are put forward.