In the concrete construction, the sandblasting pipe is pre-buried in the joint. Before the pre-embedded sandblasting pipe, the joint surface of the sandblasting pipe is required to be trimmed to remove the floating slurry, oil stain, looseness, hole and gravel mass. If necessary, the waterproof mortar can be repaired. After the repair of the joint surface is completed, the sandblasting pipe is uniformly fixed on the construction joint surface by special fixing members, and both ends of the sandblasting pipe are bent out of the structure, and at the same time A lead end of the blast pipe is connected to the distributor.
When the joint leaks, firstly find the leaking part, then inject the grouting liquid into the blasting pipe of the leaking part. When grouting, the grouting pump is used to inject the grouting liquid into the distributor, and the grouting liquid flows in through the distributor. In one grouting channel of the blasting pipe, the other end of the blasting pipe is sealed during grouting, and the pressure of the grouting channel injected into the grouting liquid is increased, and the styrofoam strip is elastic, and is sprayed during grouting. The foam strip is deformed by extrusion, and the grouting liquid can be ejected from the grouting hole, filled into the leaking portion of the joint, and the leak is terminated.
After the grouting is completed, the grouting passage is required to be flushed by water injection. When flushing, the outlet end of the blasting pipe is sealed. In the process of water injection, water flows in from a leading end of the blasting pipe, and another from the blasting pipe An outlet end flows out to complete the flushing of the grouting passage, so as to prevent the grouting liquid from accumulating in the grouting passage to block the grouting passage, so that the blasting pipe can be repeatedly grouted. At the same time, one end of the blast tube is sealed during grouting.
Therefore, during the grouting process, the pressure in the grouting passage is continuously increased, and the styrofoam strip is deformed by the extrusion, and the grouting liquid is ejected from the grouting orifice. When the pipe is flushed, since both ends of the blast pipe are open, water flows from one end of the blast pipe and flows out from the other end of the blast pipe, the pressure in the grouting channel is low, and the styrofoam is restored. The original pores are blocked to prevent water from overflowing from the sandblasting tube.