先张CRTSIII型轨道板张拉台座设计

Design of the Stretching Bed Technology of Pre-tensioned CRTSⅢ Slab

CRTSIII型板式无砟轨道先张法预应力混凝土轨道板,目前使用固定张拉台座法预制、工厂化生产。双向双层先张预应力,要求轨道板在张拉时纵、横向整体张拉,纵横向同步放张,所以要求张拉台座具有很大的强度和刚度,满足轨道板整体张拉要求。本设计研究轨道板固定张拉台座。预应力钢筋端部设置锚固板,既减小预应力建立起来的长度,又可长久保持预应力值不损失,提高轨道板耐久性;预应力钢筋定尺下料,专用张拉千斤顶单根初张拉,然后整体终张拉,整体同步放张。预应力钢筋混凝土加预埋H型钢张拉台座,具有强度高、刚度大、变形小的优点,完全能满足轨道板生产需要。

T Double directional pre-tensioned CRTSⅢ slab is a new type of ballastless track on high speed railway with our own independent intellectual property rights. At present, plate precast production of pre-tensioned CRTSⅢ slab is used of fixed tensioning pedestal, and realizes factory production. Double deck Prestressed of pre-tensioned requires the track plate to be stretched vertically and horizontally as a whole, and to be stretched vertically and horizontally simultaneously, so the tension bench is required to have great strength and stiffness to meet the overall tensioning requirements of the track plate.. This paper describes the design of pre-tensioned CRTSⅢ slab stretching bed. The installation of anchor plate in rebar ends can not only reduce the length of the prestressed steel, but also keep the prestressed value for a long time and improve the durability of the track plate. With a standard length, Prestressed steel reinforces the ability to sustain early prestressing tension for every single steel bar, then bears integral stretching, and ends with integral Synchronous unloading. With the advantages of high strength, high stiffness, small deformation, prestressed steel reinforced concrete pre buried steel H stretching bed, and can fully meet the production needs of of pre-tensioned CRTSⅢ slab.