Riding the east wind of reform and opening-up, people's travel demand has prompted China highway construction to usher in the spring of development. All over the country, large-scale construction is under way to build expressway. After nearly 40 years of development and construction since the reform and opening up, China's highway network has basically matured and extended in all directions, greatly facilitating people's travel and business exchanges. At the same time, the quality problems in highway bridge construction are also very prominent, which has aroused widespread concern in society. Therefore, the quality of highway bridge construction has become the main concern of highway bridge construction at present. Among them, asphalt paving is an important factor affecting the quality of highway construction. Therefore, some experts and scholars have deeply discussed the asphalt paving construction technology in highway pavement construction, and put forward many effective solutions.
1 Technical Characteristics of Asphalt Paving in Highway Pavement Construction
At present, when paving asphalt on highway pavement, the main tool we use is asphalt paver. Therefore, in order to ensure the quality of asphalt paving, we usually choose a good quality paver to meet the requirements of highway pavement construction. Details are as follows. First of all, the relevant units undertaking highway construction have the right to decide on the selection and transportation of materials. In order to ensure the quality of highway pavement, the relevant units undertaking highway construction must assign professional and experienced technicians to be fully responsible for the transportation and unloading of related materials to ensure the quality of highway construction materials. Secondly, asphalt paving has certain requirements for temperature. Before asphalt paving, the staff must preheat the screed of the paver to make its temperature reach above 100℃. When paving asphalt, the staff must ensure that the paver works continuously, control the speed of the machine reasonably, and ensure that it can advance according to the established route. It should be noted that when the paver is working, its route cannot have inflection points. If it collides with other mechanical equipment in an accident, it should be handled in time, and it can be used again after comprehensive inspection to ensure that it is correct.
Thirdly, when paving asphalt, the material level of the auger of the paver should be consistent with the normal paving material level. On this basis, the vibration frequency of the machine should be continuously improved and the machine should be adjusted regularly to make it always work normally. Finally, it is necessary to start the asphalt paver and rammer continuously, and then carry out continuous operation, control the position of the material level in real time, and place it reasonably according to the specific situation in the operation. However, some unexpected situations may occur in actual operation. If the paver trips, it is necessary to ensure that the mixture paver does not move, so that the temperature transfer between the joint and the mixture can continue, and then the compactness of the two positions is consistent.
2 asphalt paving construction technology preparation stage
2. 1 technical preparation
Under normal circumstances, when we are carrying out highway construction, after the subgrade work is completed, the staff will check and accept this section of highway to ensure the construction quality at all stages of the highway. If unqualified places are found in the inspection and acceptance, corresponding measures must be taken immediately to solve them. Before the unqualified subgrade problems are solved, asphalt paving cannot be carried out blindly. Before asphalt paving, we must do a good job of technical inspection, and the staff must carry out inspection in strict accordance with the corresponding specifications to lay the foundation for asphalt paving quality.
2.2 asphalt mixture ratio and transportation
Before paving, we should mix the mixture, which is very important and directly related to the paving quality of asphalt. Therefore, the mixing time and temperature of the mixture must be strictly followed to ensure that all parameters meet the requirements of highway paving. This work is finished, don't think it's over. Be sure to check it. If there is overflow or waiting material, the mixture ratio must be adjusted. For the mixture that meets the standard, it should be mixed, and then the mixture should be sent to the mixing station for mixing. In this process, special attention should be paid to the transportation of the mixture. Because the mixture may agglomerate in the transportation process, in addition to avoiding it in the production process, we should also choose a professional mixture truck to avoid colliding with other equipment in the transportation process.
2.3 Adjust the automatic control device of paver cross slope.
Before paving asphalt, it should also be noted that the staff must design the construction slope according to the specific construction conditions, and then adjust the mechanical equipment to determine the position of the inductive leveling instrument. When the asphalt mixture in the tank reaches more than 2/3, workers can start paving asphalt.
3 construction stage asphalt paving construction technology
3. 1 paving construction technology
When paving asphalt on highway pavement, workers must know the speed of paving equipment. The speed is mainly determined by two factors, one is the paving width of highway pavement, and the other is the output of mixer. If the road under construction is expressway, the staff should use two or more pavers for joint operation, and the distance between the pavers should be controlled within 20cm. For some places where pavers cannot be used for paving, pavement asphalt can be paved manually. During paving, it is necessary to ensure that the paver moves as evenly as possible. If there is unevenness, it can be adjusted by manual repair.
3.2 Rolling construction technology
Rolling is the most important part of asphalt paving, so the compactness of highway must be guaranteed. At present, the roller is the main rolling tool we use, and its quality has a decisive influence on the rolling effect. Because the rolling effect will be affected by many factors, we generally choose the red, yellow and green rolling method to avoid heavy pressure or omission to the greatest extent.
3.3 Joint construction technology and compaction technology
It is a common phenomenon that longitudinal or transverse construction joints appear when paving asphalt. For these construction joints, we can choose the way of paving equipment working together and control them through reasonable methods to ensure the construction quality. The position of the machine must be well controlled, and the front-rear distance should be kept at 5 ~ 10 cm. For some transverse construction joints, the staff can stretch longitudinally through a ruler, and the length of the ruler shall not be less than 3cm. If these methods can't eliminate the construction joints, we can remove them and repave them. In asphalt paving operations, we generally use road rollers for compaction. To sum up, it is very important to control the quality of asphalt overlay construction in highway pavement construction, which is an important guarantee to improve highway safety and durability. At present, our country has been emphasizing sound and rapid development, and so has highway construction. First of all, we should make all the preparations for planning and paving, then strictly supervise the quality after the project starts, and do a good job of acceptance after the project is completed. Control the quality and speed from each stage of pavement construction, so as to ensure the construction efficiency and quality of highway pavement.
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