Subway segment
Related plans：
With the construction and operation of a large number of subway transportation projects in our country, subway tunnels are gradually entering the operation and management period. The existence of a large number of tunnel diseases has led to a significant increase in the manpower, material resources, and financial resources spent on tunnel maintenance and management. However, detection and prevention are the best ways to manage. Regular inspection of tunnels and early prevention of diseases are more meaningful than treating diseases.
Simply put, subway tunnel segments are prefabricated segments assembled one by one behind the shield machine as it excavates. These segments are the main assembled components of shield construction and form the innermost barrier of the tunnel. They bear the pressure of the earth and groundwater and other special loads.
The GPR method is a broadband (10MHz~3GHz) electromagnetic technique used to determine the distribution of underground media. One antenna transmits a high-frequency, wide-band electromagnetic wave, and another antenna receives the reflected wave from the interface of the underground medium. When the electromagnetic wave propagates in the medium, its path, electromagnetic field strength, and waveform change with the geometric shape of the physical body interface according to the electrical properties of the medium it passes through. Based on the information such as the two-way travel time, amplitude, and phase of the received reflected echo, the medium structure and physical characteristics are inferred.
Figure 1: Principle Diagram
Figure 2: Photo before segment casting
Figure 3: Photo of segments
Data Case:
Data Image:
Note: The interface reflection signal is strong in the area marked by the red box. The signal is a strong reflection signal, and the same-phase axis is discontinuous and broken. Generally distributed in the region, indicating the existence of non-compaction.
Note: The interface reflection signal is strong in the area marked by the red box. The signal is a strong reflection signal, and the same-phase axis is discontinuous and broken. Generally distributed in the region, indicating the existence of non-compaction.
Note: The interface reflection signal is strong in the area marked by the red box. The signal is a strong reflection signal, and the same-phase axis is discontinuous and broken. Generally distributed in the region, indicating the existence of non-compaction.
Related plans
undefined
Focusing on creating value for customers and the industry
Contact Us
Manager Yang：18942904640
Mail：1310182090@qq.com
Address: No. 2, 22nd Floor, Yunhe Building, Yuemachang, Wuchang District, Wuhan, Hubei Province