基于三维激光扫描的老旧渡槽结构性能安全评估

渡槽在运行多年后需要进行安全评价以确定渡槽的运行性态,以便为下一步加固或重建提供科学依据。由于渡槽修建年限较久,原设计资料的缺失将给渡槽的结构安全评价造成较大困难。以某双曲拱渡槽为例,以现场安全检测为基础,采用三维激光扫描技术对渡槽进行实景复制,建立渡槽三维点云模型,经数据处理后形成实体模型并进行三维数值计算,再结合拱圈稳定性计算成果,实现对槽身及支承结构受力性能的分析,从而达到了从整体上对渡槽结构进行安全评价的目的。

Safety Assessment of Old Aqueduct Structure Performance Based on Three-dimensional Laser Scanning

After many years of operation,the safety evaluation of aqueduct was needed to determine the operation behavior of aqueduct so as to provide scientific basis for further reinforcement or reconstruction.Due to the long construction period of the aqueduct,the lack of original design data caused great difficulties in the structural safety evaluation of the aqueduct.Taking a hyperbolic arch aqueduct as an example,on the basis of on-site safety inspection,the aqueduct was reproduced by three-dimensional laser scanning technology,and the three-dimensional point cloud model of the aqueduct was established.After date processing,the solid model was formed and the three-dimensional numerical calculation was carried out.Combined with the calculation results of arch ring stability,the mechanical properties of the tank body and supporting structure were analyzed,and the safety evaluation of the aqueduct structure as a whole was achieved.