Tunnel 3D section structure deformation and apparent disease detection system

Tunnel 3D section structure deformation and apparent disease detection system

During the construction process of a new tunnel, it is necessary to regularly observe and measure the deformation of the excavation face and support structure, as well as the position and direction of the tunneling machine head, in order to ensure the safety of construction personnel and the long-term stability of the tunnel structure, which involves excavation, tunnel excavation, support reinforcement, drainage treatment, ventilation and lighting, and pipeline laying.

During the maintenance process of operating tunnels, in order to understand the overall health status of the tunnel structure, it is necessary to regularly monitor the overall convergence and deformation evolution of the tunnel. Monitoring indicators include local abnormal deformation settlement, section convergence, and limit, and timely warning of exceeding limits and abnormal situations.

During the operation of a tunnel, there are various degrees of external structural defects, such as lining cracking, falling blocks, misalignment, water leakage, etc. These defects not only shorten the maintenance cycle and service life of the tunnel, but also threaten the safety of tunnel operation. It is necessary to regularly identify and grade the defects inside the completed tunnel, adopt effective repair methods, and control the development and spread of defects.

Tunnel 3D section structure deformation and apparent disease detection systemfunction

Based on the shortcomings of the existing real-time tunnel inspection and monitoring methods, Ketianjian has independently developed a comprehensive tunnel inspection vehicle, including: (1) a virtual traverse measurement system: based on the principle of line light path camera chain camera measurement, multiple high-speed camera transmission stations are set up in the tunnel according to the site conditions and measurement requirements using the effective space inside the tunnel. The camera field of view is used to observe the previous level station, forming a virtual traverse for multi-level transmission of photogrammetric light, realizing high-precision online measurement of excavation face, support structure deformation and tunneling machine head during tunnel construction, accurately reflecting the direction of the tunnel axis and providing a guarantee for precise control of the tunnel construction axis.

(2) Inspection car measurement system; Based on the principle of dynamic camera network camera measurement, consisting of laser radar, surround view image array, and side view image array, point cloud and high-definition image data of the tunnel inner wall are collected. After multi-modal data recognition and analysis of disease characteristics, disease data such as misalignment, cracks, and falling blocks can be obtained. Multiple tunnel data such as clearance, ellipticity, and limit can also be obtained. High definition images simultaneously record the target control points provided in the virtual wire, which can achieve global alignment of the overall point cloud of the tunnel and be used to monitor the convergence deformation evolution of the tunnel

Compared with traditional methods, this system can effectively solve the problems of occlusion and lack of visibility between the measurement benchmark and the target being measured, as well as large alignment errors in the overall geometric shape of the tunnel. It has the advantages of non-contact, self-contained, undisturbed, high measurement accuracy, good real-time performance, and intelligence. The system collects and processes data in real-time on-site, feeds it back to the control personnel, and enables them to respond accordingly to real-time information, greatly improving the efficiency of various measurement tasks in new and operational tunnels. It can be extended to high-precision layout measurement and deformation monitoring in various non visible scenarios such as tunnels, subways, pipelines, etc.

For the settlement monitoring of long linear structures such as tunnels, the camera station is placed on the vehicle platform, and during the inspection process, the camera station is dynamically networked to form a dynamic camera network of the vehicle platform, which is a further expansion of the series parallel camera network.

By dynamically networking camera stations, the problem of vehicle platform movement can be solved, achieving high-precision, mobile, and efficient measurement of settlement and deformation of long mileage structures.