Grouting core-pulling inspection of grouting outlet pipe of prefabricated building sleeve

A grouting core-pulling detection method for the grouting pipe of the prefabricated building sleeve is proposed. For the prefabricated concrete structure connected by the grouting sleeve, after the sleeve grouting has been cured for a certain period of time, drill several small holes of a certain depth at the outlet of the sleeve grout pipe and embed the screws, and then conduct the pull test on the screws. The grouting material in the grout outlet pipe is pulled out, and the channel formed after the grout in the sleeve grout outlet pipe is core-pulled is used to achieve the purpose of quality inspection and repair of the grouting of the assembled component. On the construction site, make the hole with a diameter of 4 mm and a depth of 25 mm and embed the screw for the pull test. The test results show that the method has the advantages of simple operation, low cost, random speed, non-destructive, etc., and has great engineering practical significance.