桥梁予应力施工技术

    （1）施工方案

    A、B桥及人行天桥为后张式予应力砼结构，其予应力按后张法工艺施工，即在绑扎梁体钢筋时，予应力管道采用波纹管成孔，波纹管采用钢筋网定位，使其符合设计位置，然后用人工辅以吊机、卷扬机将钢束（钢绞线组合）穿入波纹管内，采用商品砼（40号；50号砼用泵车进行浇灌，待砼达到张拉强度。用千斤顶施加予应力，锚固、灌浆（压浆）、封端。

    A、张拉要用双向张拉；

    B、张拉千斤采用YCL—420型；

    C、锚具要用OVM系列；

    D、予应力钢绞线采用高强度、低松驰的270级钢绞线，直径15.01MM标准强度Ryb=1860Mpa。

    E、张拉前进行摩阻测试，根据实际U值进行调
Bridge construction technology to the stress

    (1) construction program

    A, B Bridge and pedestrian bridge for the post-tensioned type to the stress of concrete structure, to stress by post-tensioned construction process, that is lashing beams reinforced when I stress pipelines using corrugated pipe into the hole, corrugated pipe with steel mesh position, so that conform to the design of its location, and then supplemented with artificial crane, hoist the steel beam (strand combinations) penetration bellows, the use of Shangpin Tong (40; 50 concrete with a pump for irrigation, to be concrete to tensile strength . with the jack to the stress imposed, anchoring, grouting (grouting), closed end.

    A, use two-way tension tension;

    B, stretching extremely heavy use of YCL-420 type;

    C, anchorage to use OVM series;

    D, to the stress of high strength steel strand, low relaxation of the 270 strand diameter 15.01MM standard strength Ryb = 1860Mpa.

    E, before tension friction test, adjusted according to actual U values