Grouting construction method for vent-hole-free duct of prestressed bridge

The invention discloses a vent-hole-free duct grouting construction method for a prestressed bridge, which comprises the following steps of: replacing air in a grouting duct with ammonia gas by using the two methods, then preparing grouting slurry with better flowability, grouting from a grouting hole at the higher end of a cover beam, and sealing the other end of the cover beam. The first mixing amount of the grouting slurry needs to meet the requirements of the whole duct as much as possible, on one hand, a reserved exhaust hole does not need to be formed in the prestressed duct, and on the other hand, ammonia gas is dissolved in the concrete slurry after being replaced, so that negative pressure is formed in the prestressed duct, a siphoning effect is generated, and the concrete slurry can be densely poured into the prestressed duct. The problem that grouting of a bridge prestressed duct without reserved exhaust holes is not dense is solved. 本发明公开了一种预应力桥梁的无排气孔孔道压浆施工方法，利用上述两种方法对压浆孔道内的空气进行置换为氨气，而后配置流动性较好的压浆浆