If the corrugated tube is not compacted, the steel winch will be corroded, and the prestress will be lost in advance, which will shorten the bridge life. The formation defect of corrugated pipe is mainly that the cement slurry is not filled with the entire corrugated pipe, resulting in a large crescent-shaped gap at the top of the corrugated tube, and even a phenomenon of dew. Another phenomenon is that the strength of the slurry is not enough to make the slurry, steel winch, and concrete beam form a unified whole. The main reasons for this quality defect are: 1. The improper selection of cement slurry and a 力能波纹涵管 热镀锌涵管 波纹管 涵管厂家 热镀锌涵管 波纹管力能波纹管 Q345 Q235dditive resulted in a large ratio of cement ash. 2. When the cement mud is prepared, the fluidity and water rate do not meet the requirements, so that some of the bellows are occupied by the water produced, and the water is absorbed or evaporated, resulting in voids. 3. The construction staff's grouting operation is not correct, the grouting speed is too fast or the grouting pressure is low. When the grouting is not waiting for the grouting hole to emerge, the grouting will stop. 4. During grouting, due to improper grouting or mechanical failure, the grouting was suspended, but the corrugated pipe behind the front grouting was not cleaned in time. As a result, when grouting again, it could not proceed normally due to blockage, forming an internal hole. 5. The parts that need special treatment are still pressed according to the general