Asphalt mixture production is a key step in asphalt pavement construction, and is generally undertaken by the construction contractor (Party A, later referred to as the construction party).
However, for small and medium-sized pavement projects, maintenance projects or large-scale projects with tight construction schedules, if the direct-purchasing and asphalt pavement of the asphalt mixing plant (Party B) adjacent to the construction site is directly purchased, the construction cost can be effectively reduced and the construction preparation time can be reduced. To shorten the construction period and reduce the number of management objects and coordination objects. At present, the operation mode of this mixed material production (or transportation) subcontracting is quite common in small and medium-sized construction projects.
The transportation distance has an impact on project cost, quality, schedule and safety.
When the mixing plant is close to the construction site, the price of asphalt mixture is lower, the heat aging and temperature segregation are lighter, the coordination of transportation organization and traffic control department is reduced, the transportation safety risk is reduced, and the transportation distance is too long. The arrival time is irregularly delayed to ensure the continuity of the construction.
According to the characteristics of the construction site, the model of the suitable mixing building should be selected so that the production speed of the mixing building is slightly larger than the paving speed.
Consider the age of the mixing building, maintenance status and current equipment usage to reduce equipment failure rate.
The quantity and volume of asphalt storage tanks should meet the requirements of various asphalt storages to meet at least one day of construction consumption, and the transportation distance of asphalt and the time of transportation arrival should be considered.
Each asphalt tank must have the function of separately heating up and transporting the asphalt separately.
The modified asphalt storage tanks need to be equipped with agitating equipment and equipped with pipes that can reach the mixing tank of the mixing plant, or through the pipelines and other empty storage tanks with mixing facilities, to reach the mixing tank of the mixing plant.
For the heating and heating system, the heat value of the heat transfer oil furnace is matched or slightly higher than the heat value of the mixed building. The heat transfer oil pipeline is arranged reasonably, and the heating rate is fast and the time is short.
The layout of the heat-conducting oil pipeline is relatively sophisticated, which can reflect the quality of the mixing staff from the side, and whether it has enough experience in repair, maintenance, operation and management of the mixing building.
Aggregate needs anti-pollution, waterproof and anti-mixing. Therefore, the storage bin floor must be hardened, and the temporary aggregate storage site is free of dirt and other debris; the site is well protected and drained, no water is accumulated, and the silo bin has a shelter; Each specification silo shall be provided with partition walls or with a certain interval between each other to ensure no mixing.
In addition, the silo arrangement is as convenient as possible for the loader to shovel the aggregate to the cold hopper. The silo mark is conspicuous, and the silo capacity should reach at least one day of production demand for each aggregate. If the aggregate is inconvenient, the material should be expanded according to the actual situation. warehouse.
It is best to set up a laboratory for the mixing plant. It has an independent, water-filled, well-ventilated indoor space. It is equipped with basic instruments and instruments for collecting aggregates, asphalt and mixture materials, and meets the standards of local site laboratories as much as possible.
At least one skilled technician in the key positions (operation, maintenance, test) of the mixing plant is certified to work.
The power supply, water supply conditions and the surrounding social relations of the mixing plant should be understood so as not to affect normal production.
Mixing of mixing plants with other construction projects should be avoided as much as possible.
Asphalt mixing plant