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后张法预应力钢筋混凝土梁管道压浆是否“饱满密实”,关系到梁的整体性与耐久性。一般管道压浆多采用二次压浆法:第一次是初步将铁皮套管灌满灰浆,保持一定时间,让其沉淀。第二次再压灌灰浆并挤出第一次压浆沉淀后的清水。采用这种方法,每根管道先后要装、拆压浆管节七次,一片长33米梁(每片梁六根钢丝束)的管道压浆,需12人同时操作,约7～8小时才能完成。我局去年在某大桥工地,曾用二次压浆法试灌了12根钢丝束管道灰浆,水灰比0.40
Post-tensioned prestressed concrete beam pipe grouting is “full and dense”, relates to the integrity and durability of the beam. The general use of the secondary pipe grouting mortar: the first time is to fill the tin casing with mortar, to maintain a certain time, let the precipitation. Press the grout again for the second time and squeeze the water after the first grout settling. In this way, each pipe has to be installed and demolished seven times the slurry pipe section, a 33 m long beam (each beam six steel wire) grouting pipe, required 12 simultaneous operation of about 7 to 8 hours carry out. I Bureau last year in a bridge site, had used secondary grouting test irrigation 12 steel pipe grout, water-cement ratio 0.40