云南波纹涵管 西藏波纹涵管 山西

using nondestructive testing techniques. It mainly includes impact back wave method(I E), surface wave spectrum imaging method(SASW), ultrasonic imaging method(UT), ground penetrating radar method(GPR), ultrasonic phase formation method and so on. However, due to the differences in the principle, scope, and accuracy of various detection methods, the engineering community has always expected a stable and efficient detection method, so that non-destructive testing technology can play a greater role in bridge testing. In view of this situation, the author first analyzes the existing problems and causes of corrugated pipe grouting, and puts forward a method to reduce the defects of corrugated pipe construction. Finally, combining with a high speed project in Chengde and using the most durability of the structure of the girder, we need to grout the tunnel pressure containing prestressed bars when the prestressed concrete beam is used. The corrosion of prestressed tendons and the loss of effective prestress caused by the infullness of prestressed tunnel pressure are the biggest threats to the bridge's service life, which will directly affect the overall strength and durability of prestressed bridges. Some studies have been carried out at home and abroad, most of them using nondestructive testing techniques. It mainly includes impact back wave method(I E), surface wave spectrum imaging method(SASW), ultrasonic imaging method(UT), ground penetrating radar method(GPR), ultrasonic phase formation method and so on. However, due to the differences in the principle, scope, and accuracy of various detection methods, the engineering community has always expected a stable and efficient detection method, so that non-destructive testing technology can play a greater role in bridge testing. In view of this situation, the author first analyzes the existing problems and causes of corrugated pipe grouting, and puts forward a method to reduce the defects of corrugated pipe construction. Finally, combining with a high speed project in Chengde and using the most advanced I-E S detection technology at home and abroad, the feasibility of this