The application belongs to the technical field of prestressed construction of building
engineering, and discloses a vacuum-assisted negative
pressure grouting device and method for post-tensioned bonded prestressed steel bars, which comprises a grouting
system, a vacuum
system, and two sealing joints. The grouting
system comprises a
storage tank, one end of a material conveying pipeline is communicated with a material conveying end of the
storage tank, and the other end of the material conveying pipeline is communicated with a grouting hole on a hole sealing plate. The vacuum system comprises a
vacuum pump and a negative pressure filtering container, one end of a
vacuum pumping pipeline is communicated with a
vacuum pumping end of the
vacuum pump, the other end of the
vacuum pumping pipeline is communicated with a
slurry outlet hole on the hole sealing plate through the negative pressure filtering container, and a filtering element is arranged in the negative pressure filtering container. The two sealing joints are respectively used for sealingly connecting the material conveying pipeline and the vacuum pumping pipeline with the grouting hole and the
slurry outlet hole. The application effectively prevents the
cement slurry from being sucked into the
vacuum pump, avoids equipment damage, ensures the absolute sealing of the pipeline interface during the grouting process, improves the fullness and compactness of the hole grouting, and thus guarantees the durability and
structural safety of the prestressed steel bars.