论文部分内容阅读
“十一五”前夕,国家高铁项目的启动,无疑对混凝土机械市场起着强劲的拉动作用。由于高速铁路涉及到大量的桥梁和隧道建设,因此大型混凝土箱梁预制、隧道及桩基础施工成为高铁建设的重中之重。根据高铁施工的工艺要求,900 t箱梁预制必须采用高性能的C50型混凝土进行连续性浇注,而隧道工程与桩基础施工同样需要C30型及以上高性能混凝土进行衬缝和灌桩处理。然而,由于高性能混凝土外加剂很多,含沙量较
The eve of “Eleventh Five-year”, the national high-speed rail project started, no doubt on the concrete machinery market plays a strong stimulating role. As high-speed railway involves a large number of bridges and tunnel construction, prefabrication of large concrete box girder, tunnel and pile foundation construction become the top priority of high-speed rail construction. According to the technical requirements of high-speed railway construction, prefabrication of 900 t box girder must be continuously poured with high-performance C50 concrete. Tunnel construction and pile foundation construction also require high-performance concrete of C30 type and above for lining and filling of piles. However, due to the high performance concrete admixture, sediment content is higher