Ensure the continuous paving operation.
The sweeping operation is generally carried out by the combination of sweeper, wire brush, broom and blower..
The paver with automatic leveling device shall be selected for paving.
It shall not be dumped randomly to avoid environmental pollution.
The mixture separated, caked or stuck on the carriage must be discarded.
However, the early disease of asphalt pavement will seriously affect the performance and service life of asphalt pavement.
Mix the materials in advance before paving every day.
As a jointless continuous pavement, asphalt pavement has sufficient mechanical strength, can adapt to various driving loads, and has the advantages of smooth and comfortable driving, low noise, and convenient maintenance.
Since the repaired pavement must be flush with the original pavement, the original pavement shall be directly used as the leveling datum during paving.
Before construction, the range of milling and planing shall be determined according to the actual conditions of pavement diseases, and then the milling and planing line samples shall be released on the site.
When discharging to the paver, the transport vehicle shall stop 10 cm~30 cm in front of the paver, and shall not impact the paver.
The milled waste is directly transported to the transport vehicle by the conveyor belt of the milling machine, and then uniformly transported to the designated place for waste by the transport vehicle.
According to the approved mix proportion, the asphalt mixture shall be graded and loaded by mouth under the monitoring of the laboratory, measured accurately, mixed uniformly, and the heating temperature of raw materials shall be strictly controlled: (1) asphalt heating temperature: 150~160 ℃ (ordinary asphalt), 165~175 ℃ (modified asphalt); (2) stone heating temperature: 185~195 ℃ (ordinary asphalt), 190~210 ℃ (modified asphalt); (3) mixture stone discharge temperature: 160~170 ℃ (ordinary asphalt) Overheating shall be avoided in the mixing process of 170~185 ℃ (modified asphalt).
2.3 Asphalt mixture transportation The asphalt mixture shall be transported by large tonnage dump truck.
The target mix ratio and production mix ratio of asphalt concrete shall be determined in accordance with Technical Code for Construction of Highway Asphalt Pavement (JTGF40-2004), and shall be reported to the supervising engineer for approval before construction.
During mixing, the filling rate of the mixer is 70%, and the mixing time of each pot is 40s~50s, of which the dry mixing time is not less than 5s.
During the construction, we use small jacks to erect aluminum alloy, which has a good effect.
When the factory temperature of asphalt mixture is higher than 195 ℃, the mixture must be discarded.
The mixture shall be covered with canvas and cotton quilt during transportation.
When the mixer discharges materials to the transport truck, the truck shall be moved once for each discharge, and the method of two ends first and then the middle shall be adopted to prevent segregation of the mixture.
The balance beams are set with datum points that can adjust the height every 5 meters.
As the asphalt waste particles milled by the milling machine are relatively uniform and of high economic value, they can be used as raw materials for asphalt thermal regeneration or for mud bonded macadam pavement.
2.4 When the paving width of asphalt mixture is less than 7m, one paver shall be used for paving.
Because the paving thickness of the slope adjustment section is uneven, the coefficient of loose paving must be considered when adjusting the elevation of the reference point.
2.2 The asphalt mixture is mixed by intermittent mixing equipment.
2.1 The construction of asphalt concrete mixture in the construction setting out, milling and repair project must be paved according to the linear, plane and size of the original pavement.
1、 Milling of asphalt pavement Large milling machine with automatic control of milling depth should be used for asphalt pavement milling of expressway.
Then, the number of milling machines shall be determined according to the number of works to be milled, and the end of the section to be milled shall be milled in sequence.
We selected ABG-423 paver in the construction, which has stable performance, good vibration and initial compaction effect, and good paving effect.
Therefore, the milling waste must be uniformly collected and managed, and then comprehensively utilized according to the situation.
Clean the carriage before transportation to make it flat and clean, and apply the isolating agent.
When the paving width is more than 7m, two asphalt concrete pavers shall be used for parallel paving.
Cleaning is an important construction process of asphalt pavement milling and repair construction, which consumes a lot of time and manpower, so it must be organized and arranged reasonably.
During construction, we choose 20 dump trucks with a load of more than 25T to ensure that the temperature of asphalt mixture transported to the site is not lower than 165 ℃.
The elevation of each datum point is calculated by averaging the elevation difference at both ends to each datum point.
Rolling shall be carried out when the temperature is not lower than 150 ℃.
If the thickness of the slope adjustment section is greater than 8cm, it must be filled in layers.
Milling and planing shall be completed at one time as far as possible, and shall not be stopped except for special reasons.
2、 Asphalt pavement repair The repair of asphalt pavement must be carried out according to the methods and requirements of asphalt concrete pavement construction.
When adjusting the slope, first measure the elevation of the non settlement positions at both ends of the settlement, and then erect aluminum alloy balance beams on both sides of the paver as the leveling datum plane of the paver.
It should be noted that if the original road surface has settlement and vehicle bump, the slope must be adjusted.
The mixing station is equipped with a cold aggregate supply system, a hot aggregate elevator, a screening device, a hot aggregate storage bin, a storage and transportation device, an asphalt storage and transportation system, a weighing system, a mixer, a finished material storage bin and transportation device, a dust removal device, etc., and five cold bins.
When two asphalt pavers are used, they shall be jointly paved in echelon operation, and the paver tracks overlap by 50mm~100mm.
Before the formal construction, appropriate transportation routes shall be selected, and the routes with the shortest time and least interference shall be selected as far as possible.
Since a large amount of milling waste remains on the lower bearing layer after milling, the lower bearing layer must be thoroughly cleaned before asphalt concrete paving.
When discharging, the vehicle shall be in neutral gear, pushed by the paver, and brake gently to prevent the hopper of the paver from slipping due to inertia.
