1. The outer mouth of the trench pipe must be clean and clean. If necessary, the chisel should be chiseled. 2. After the interface is completed, if a small amount of falling off, cracks, etc. are found, it should be repaired in time. If the situation is serious, the weight should be removed. 3. Asphalt and hemp are embedded. In the case of gaps, the nozzles and pipe walls shall not be contaminated and shall be removed if there is contamination.
Fourth, the quality requirements 1. The interface gap should be even, the mortar embedded should be dense, the surface is flat, no cracks, no shell.
2. Allowable deviation: The interface width and thickness are ±5mm.