With the frequent occurrence of road collapse accidents, how to achieve the orderly development, utilization and management of underground space has become a difficult problem for related departments to urgently solve.
Endless collapses of urban roads
In recent years, urban road collapse accidents have occurred frequently. In some areas, there are even several road collapses in one day. Even if people are walking on a "flat" road, they have to be "shocked step by step"!
At more than 2 pm on November 3rd, at the intersection of Shili Road and Tongsha Road, Nanshan District, Shenzhen, the road collapsed, the ground collapsed into a large pit, and a muddy cart almost fell into the large pit.
(Picture from the network)
On August 23, Lanzhou, the capital of Gansu Province, staged a "three collapses in one day". Pedestrians, expectant mothers, cars, and mud tankers fell into the pit.
On June 5, the road in front of a school in Nanning, Guangxi collapsed.
On May 21, a sudden collapse of a road surface in Ruijin City, Jiangxi, caused four cars parked on the road surface to fall into a pit.
The collapse of urban roads will not only cause traffic jams, but also cause car crashes and fatalities, causing huge social impacts.
Ground penetrating radar technology effectively prevents collapse accidents
The collapse of urban pavement is mainly caused by the existence of hidden dangers of subgrade diseases. With the development of the city, the underground pipelines and subways under the roads are becoming more and more dense. Deep foundation buildings such as underground parking lots around roads are also becoming denser. This has brought unprecedented hidden dangers to the safety of the roadbed.
GPR is a non-destructive testing technology that can be safely used in urban roads. Loose working conditions, no need to close traffic, strong adaptability, strong anti-interference ability, and high detection accuracy and resolution. In particular, the three-dimensional ground penetrating radar technology based on antenna array technology can periodically detect and evaluate the subgrade of urban roads, timely grasp the distribution and extent of subgrade diseases, prevent vicious accidents such as road collapse, and become a type of urban road collapse prevention. solution.
3D-Radar 3D Ground Penetrating Radar
GeoScopeTM 3D ground penetrating radar from Norwegian 3D-Radar company uses innovative frequency stepping radar technology and unique antenna array technology. The radar frequency scan range is from 100MHz to 3GHz, which is completely set by the user according to different applications, which can meet different requirements. Depth measurement can also meet the requirements of high resolution. Compared with traditional radar (no carrier frequency pulse and FM continuous wave), this technology has the following advantages:
● The frequency components output by the radar signal source can be precisely controlled, and the energy of each frequency component is equal;
● By controlling the bandwidth of the signal sent by the radar host, it can effectively suppress noise and improve sensitivity;
● The radar signal is a frequency domain signal, which can be easily processed and analyzed by using the frequency domain signal processing technology.
3D-Radar's 3D ground penetrating radar provides urban road managers with a technology platform for field data collection and data analysis. Municipal roads can be applied to:
● Underground cavity detection report;
● Pavement crack disease depth report;
● Evaluation of road medium compactness and water content;
● Road structure layer thickness report;
● Underground pipeline detection report;
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