With the development of modern economy, the utilization rate of expressway has also shown an obvious upward trend. The performance and safety of highway are becoming more and more important, and pavement detection is the most important means to evaluate the performance and safety of highway. In recent years, highway pavement detection technology has developed rapidly, and the detection technology has gradually developed from traditional manual detection to automatic detection and intelligent detection. The development of detection technology has also significantly improved the efficiency of road surface detection, thus ensuring the smooth use of roads and the smooth maintenance of roads. Next, we will specifically study the development of highway pavement detection technology and the application of new technologies.
1 Necessity of establishing highway detection system
① Establish the basic data center of the whole life cycle of the highway, which can record and save the design structure, construction materials, opening time, various foundation maintenance and other data of the highway; (2) Improve the operation mode of highway data collection that affects normal traffic and has high operation risk, unify the data collection format and requirements, and greatly improve the work efficiency and the accuracy of basic data collection; (3) It can solve the difficult situation of complete storage, query and call of highway pavement data, unify data management and facilitate real-time data update; ④ The life cycle model can be established for diseases, and the whole development process of highway pavement diseases can be tracked and detected, and the maintenance scheme can be formulated according to local conditions; ⑤ Standardize the daily work of highway technicians, cultivate their knowledge of digital detection technology, and form a good working habit of informatization.
2 expressway pavement intelligent detection technology composition
With the development of highway pavement detection [3], the wide application of intelligent detection technology is an inevitable trend. Intelligent detection technology can automatically detect the smoothness, rutting and damage of road surface under the condition of ensuring normal driving, so as to achieve good detection purpose.
1. Collection of test data: In the process of data collection, high-speed cameras and laser sensors are mainly used to collect road data quickly and accurately. At present, the data acquisition technology of pavement smoothness and pavement yield information is mature, but it is difficult to collect data of pavement rutting and pavement damage. At present, the collection of rutting data mainly depends on two means: line laser full-section data collection and point laser cross-section data collection. Line laser is widely used in China, because the data of pavement section obtained by this technology has high accuracy; The data collection of pavement damage detection should adopt different methods according to different types of pavement damage. For the common diseases of pavement damage, image recognition is usually used, and it is best to use three-dimensional laser visualization system to obtain accurate data of diseases such as settlement and package. The detection method of smoothness is to measure the distance between the main body of the vehicle and the road surface during the running of the vehicle, and obtain various data indexes of the road surface smoothness.
2. Processing of test data [4]: For pavement flatness and rutting detection, because data acquisition is relatively simple, software can generally carry out automatic data processing and generate standardized data reports; The development direction of pavement damage processing software is data preprocessing, that is, through manual and software processing, undamaged pictures are removed and only damaged pictures, cracks and other diseases are processed.
3. Mileage positioning: The traditional mileage positioning system mostly adopts the method of combining GPS and rangefinder. This method is more accurate, but there are some problems in locating the road mileage in expressway, China due to the inaccurate pile number of domestic road mileage and the interference of vehicle driving. At present, the high-precision DMI ranging system has been well applied in China.
3 Road detection technology development direction and trend
The modernization of pavement detection technology has greatly improved the modernization level of highways, especially in expressway. At present, as far as the development of pavement detection technology at home and abroad is concerned, the technologies and equipment of pavement flatness detection, pavement deflection detection and pavement skid resistance detection are relatively mature and have a high degree of automation, but the degree of automation of pavement damage detection is not too high, and the detection accuracy needs to be improved. Pavement damage detection is the most difficult and heavy workload in the whole pavement detection work. Therefore, the development of pavement damage detection technology should be the development trend and direction of pavement detection technology in the future.
Analysis of future development direction and trend of pavement detection technology [5] With the support of various advanced detection hardware devices, pavement damage detection technology will realize rapid and automatic detection of various pavement damage diseases under high-speed conditions (meeting the requirements of highway driving speed), and the detection accuracy will reach 1mm under three-dimensional conditions, and the geometric characteristics of pavement diseases can be accurately generated, thus realizing "automatic detection-real-time data analysis-disease prevention" of pavement damage.
At present, pavement management system has been widely used in developed countries and regions such as the United States, Canada, Australia, Japan and Europe, and a variety of pavement management system software and pavement maintenance management expert system have been developed. For example, the United States has carried out "Federal Highway Production and Performance Research", "Highway Performance Monitoring System Research", "Highway Economic Demand System Research" and "Urban Road Management System Research"; Canada conducted the "Canada Road Data Project Research" and developed an automatic road analyzer. British WDH Company developed the software of pavement management system. There are also pavement maintenance management expert systems, such as SCEPTRE, a demonstration system of Ontario Ministry of Communications, Canada, and PAMEX, a flexible pavement maintenance management expert system. The application of the above system is based on the basic data of pavement detection, which also provides favorable conditions for the development of pavement detection technology.
The detailed information of "Intelligent Detection System for Highway Pavement" can be found in the link of Zhong Da Consulting and Design, and all relevant building construction information you want can be found.
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