As a transportation carrier with large flow, complete facilities and high content of modern science and technology, expressway is very different from ordinary highways. With the continuous development of expressway's construction, the transportation industry has higher and higher requirements for the operation quality of expressway, so it has become an important job to do a good job in the maintenance and management of expressway. Only by doing a good job in maintenance management can expressway be put into operation in an all-weather, large-flow, large-tonnage, intact, complete, continuous, fast and high-quality manner, and truly play the leading role of road network transportation. This paper briefly introduces the characteristics of maintenance management, maintenance technical measures, daily disease treatment countermeasures and daily maintenance engineering principles in expressway, and makes a simple discussion. After expressway is completed and opened to traffic, due to the abrasion and impact of wheels, the erosion and weathering of natural forces such as rainstorm, flood, sandstorm, snow and ice, sun exposure and melting ice, as well as man-made damage and some defects left by construction, the quality of highway use will gradually decrease. Therefore, after the completion and opening to traffic, maintenance measures must be taken to constantly update and improve the road. How to do a good job in highway maintenance is an important topic that our maintenance personnel must consider. Highway maintenance is divided into four categories according to national unity: daily maintenance, regular maintenance, special maintenance and improved maintenance. The daily maintenance we are currently engaged in is to carry out frequent daily operations on highway components (including ancillary facilities) every year according to the needs, with the aim of maintaining the good state and service level of the highway. Daily maintenance projects mainly include: cleaning the road surface and other parts, repairing minor damage and replacing facilities, pruning branches, snow and ice removal in winter, and dual traffic interruption. I think we should do a good job in the daily maintenance of expressway from the following aspects: First, strengthening the preventive maintenance and repair of the pavement, prolonging the service life of the pavement and strengthening the preventive maintenance of the highway are the preconditions for prolonging the service life of the highway and maintaining the good use function of the pavement. In daily maintenance work, preventive maintenance measures should be taken in accordance with the principle of "accurate prediction and pre-repair before damage" when the pavement has not been damaged or just shows signs of disease, so as to eliminate the disease in the bud. In view of pavement cracks, technical measures are taken to prevent rainwater from invading the pavement and damaging the subgrade structure according to the principle of "irrigation must be carried out in case of cracks, and irrigation must meet the standards". In hot summer, after the pavement temperature exceeds a certain limit, active sprinkling can effectively slow down the occurrence of pavement rutting, maintain good pavement performance, prolong the service life of pavement and reduce maintenance costs. Through the preventive maintenance of the road surface, the good road conditions of expressway without bumping at the bridge head, potholes and exposed joints are realized, which provides a comfortable traffic environment for drivers and passengers. Second, keep the subgrade in good condition and reduce the frequency of subgrade diseases. Subgrade is an important part of highway and the foundation of pavement, which bears the vehicle load together with pavement. The strength and stability of subgrade are the basic conditions to ensure the stability of pavement structure and good road performance. Most subgrade diseases are related to the function of water, so the prevention and treatment of subgrade diseases mainly focus on drainage, waterproofing and water control. In the daily maintenance work, the blocked drainage channels and side ditches should be dredged and cleaned in time to ensure their full utilization. Before the flood season, carefully check the subgrade and weak drainage sections along the line, and find all kinds of unsafe hidden dangers in time and deal with them; Strengthen inspection in flood season, and timely repair subgrade diseases such as water damage, drainage groove damage, and water retaining belt cracks. Strengthening the maintenance of centralized drainage facilities such as water retaining belt, water intake, drainage trough and side ditch is a concrete work to reduce the frequency of subgrade diseases and do a good job in preventive maintenance of subgrade. Third, do a good job in daily maintenance of bridges and culverts to ensure smooth and safe bridges. Highway bridges are important facilities connecting highways. In order to ensure that the bridge structure is always in a good technical state and meet the requirements of bearing capacity and traffic capacity, it is necessary to carry out regular inspection and detection of the bridge in daily maintenance. In the usual daily maintenance, the bridge deck should be kept clean, the drainage holes should be unblocked, the drainage facilities should be good, the bearings should be in good condition without holes, the damaged bridge railings and expansion joints should be repaired in time, the weeds on the conical slope should be removed, and the garbage and deposits at the entrance and exit of culverts should be cleared to ensure the smooth and safe bridge. Four. Keep the facilities fully functional and standardized to ensure smooth operation; Maintaining the full operation of facilities along the line is an important part of daily maintenance. For the maintenance of guardrail boards and guardrails, we must operate in strict accordance with the maintenance time limit, strictly control the maintenance quality, and ensure the restoration of their original functions after maintenance. Anti-glare board facilities should be kept complete and in good condition, and the overall visual effect should be unified. It is necessary to regularly scrub the markings of the main line and interchange area to maintain their good reflective effect, strengthen night inspections, increase the frequency of cleaning the sections with poor reflective effect, and repair the aging or damaged markings in time. Signs and markings should be complete, eye-catching, clear and complete, and give full play to the role of various parts and facilities of highways. 5. Strengthening greening management and protection and keeping roads beautiful and green is one of the important contents of expressway's maintenance. It is an important factor to prevent soil erosion, stabilize subgrade, reduce noise, protect environment and create a beautiful and comfortable driving environment. It is also a beautiful scenery in expressway. According to the needs of tree production and the special requirements of highway traffic, technical measures such as watering, fertilization, pruning, pest control and so on are taken in time to keep the greening things in a good growth state. Maintain greening plants, remove sundries, prevent damage caused by other reasons, fill vacancies in time, improve the survival rate and preservation rate of seedlings, and realize their ecological functions and landscape effects. Intransitive verbs establish a sound maintenance management system in expressway, and a sound maintenance management system in expressway is the basis for doing a good job in maintenance management. System is the norm to regulate all work and people's behavior. A good set of rules and regulations can make the work of various departments connect normally, avoid mutual wrangling, prevarication and negligence, and get twice the result with half the effort. At present, our management and maintenance are subcontracted, and there is no good restraint system for road maintenance personnel. The reason is that most maintenance personnel are local farmers, and their wages are low, which leads to laziness and no sense of responsibility. Our maintenance institute will inspect the maintenance roads of maintenance personnel every week, and reward those who perform well through appraisal, so as to ensure a good and necessary road appearance and improve the enthusiasm of maintenance personnel. Seven, expressway maintenance management must implement the principle of "preventive maintenance, mechanized maintenance, prevent traffic interruption", which is more demanding and stricter than the general highway maintenance management. Expressway's maintenance is mainly to maintain or restore the original technical conditions and standards of highways, improve and improve facilities that can't meet the requirements, enhance the disaster resistance of highways, prolong the service life of highways and ensure the smooth flow of highways. According to its engineering nature, scale and technical complexity, expressway maintenance can be divided into four categories: minor repair, medium repair, major repair and improvement. Except for unforeseeable natural disasters and traffic accidents, the maintenance of expressway and its facilities should be carried out before serious damage, failure and major failure, so as to improve its service quality, reliability and stability. Strengthen the equipment, warranty and use of maintenance machinery in expressway, so as to enhance the timeliness and mobility of maintenance operations. Eight, maintenance management should be scientific and standardized. Expressway has a heavy traffic load, constantly changing road conditions, diverse maintenance operations and complex technology. Take the road of scientific and standardized maintenance. Scientific maintenance management, that is, from decision-making to construction process, depends on scientific attitude and scientific means to achieve the best benefits. In scientific decision-making, maintenance countermeasures should be determined according to the existing economic and technical parameters such as highway standards, quality, actual road conditions and traffic volume, so as to avoid subjective assumptions and deviation from actual decision-making. This requires decision makers to conduct in-depth investigation and study on the one hand, and be good at using advanced scientific and technological means to serve decision-making on the other. Strengthen preventive maintenance and regular maintenance to promote a virtuous cycle of highways. It is necessary to investigate road conditions, analyze the evolution of highway technical conditions, determine a reasonable pavement service cycle, and arrange regular maintenance project plans accordingly. In daily maintenance work, it is necessary to ensure standardized construction and safe construction, implement standardized standards, strictly follow operating procedures and standards, and ensure the safety of construction personnel during construction, and escort drivers and passengers with a high sense of responsibility and mission. Effectively maintain traffic and ensure safety. Construction signs such as "under construction" and "going slow" shall be set at the job site in advance, and red warning lights shall be installed at night to ensure that it will not cause danger to normal operators or vehicles running normally. Workers must wear orange reflective safety sign uniforms, and vehicles and machinery used for maintenance must be painted orange and equipped with yellow warning lights. In addition, in the management of maintenance projects, we should be high, precise and sharp, establish a quality supervision system for highway maintenance projects, and adhere to the "one-vote veto" system for quality to ensure the quality of projects and work. The development of expressway must adhere to the principle of paying equal attention to construction, management and maintenance, and normal maintenance management cannot be relaxed just because of high grade and good quality. Practice has proved that only scientific and strict maintenance management can improve the operation quality and economic benefits of expressway.