散射成像法在后张法预应力孔道压浆质量检测方面的应用效果分析

Analysis on Application Effect of Scattering Imaging Method in Grouting Quality Detection of Pre-stressed Structure by Post-tensioning Process

该文介绍了散射成像法在后张法预应力孔道压浆质量检测方面的应用。预应力孔道压浆质量是桥梁的耐久性的决定因素之一。压浆材料、钢绞线和预应力孔道等组成多相复合体系的异质结构材料,形成极为复杂的内部结构,检测难度非常高。近年来国内外发展出几种预应力孔道压浆质量的检测方法,雷达法、冲击回波法、声波散射成像法等。考虑到贵州省某工程的现浇梁的特性,以及对检测精度的较高要求,其检测使用声波散射成像方法,并对部分区域进行破检验证。应用成果表明声波散射技术在精细结构的工程无损检测领域有较大的现实意义。

The article introduces the application of scattering imaging method in the grouting quality detection of pre-stressed structure by post-tensioning process.The grouting quality of pre-stressed structure is one of the factors to determine the bridge durability.The grouting material,steel strand and pre-stressed structure are composed of the multiphase composite system of heterostructure materials to form the extremely complex inner structure with the very difficult detection.In recent years,several pre-stressed structure grouting quality detection methods,i.e.radar method,impact echo method and sonic wave scattering imaging method are developed at home and abroad.Aiming at the characteristics of the cast-in-situ beam in a project of Guizhou Province and the higher requirement of detection accuracy,the beam is detected by the sonic wave scattering imaging method,and the partial areas are carried out of breaking verification.The application effect shows that the sonic wave scattering technology has the greater practical significance in the engineering nondestructive testing field of fine structure.