The stabilized layer of stone powder adopts the construction method of mixing the mixture in the stabilized soil mixing plant, transporting by dump truck, paving by excavator with full width, manually repairing and rolling by 20T vibratory roller. Before construction, the raw materials shall be tested and tested in time to verify the mix design. During the construction, we should strictly follow the Technical Specification for Highway Pavement Base Construction (JTJ034-2000) and the relevant technical requirements of the technical specifications in the bidding documents. The specific construction method is as follows:
1. Construction preparation and survey lofting:
Submit the subbase of the pavement to be paved, and clean and measure the subbase after it is qualified.
2. The mixing station mixes the mixture and transports it to the construction site;
Stabilized soil mixer is used for centralized mixing of mixture, and the mixture is transported to the construction site by dump truck. Prepare and mix in strict accordance with the design mixture ratio, and strengthen the inspection of cement dosage and water content. The test platform is set near the mixing plant to adjust the cement dosage and water content in time. Due to the long transportation distance, poor transportation conditions and high temperature, the water content of the mixture should be about 2 percentage points higher than the optimal water content, and the transportation time should be shortened as much as possible. In case of rainy days, measures should be taken to protect the mixture from rain, and the mixture on the car should be covered at the same time. The storage time of factory-mixed mixture should not be too long, and the longest time from mixing to paving is no more than 3 hours, so as to ensure that the compaction is completed before the final setting of cement.
3. Paving and leveling:
Before paving the mixture, the surface of the pavement subbase should be wetted with water. Setting out middle pile with total station. Drive the hanging pile every 10m and hang the rope. Measure the design height of hanging line of each pile with a level, and fix the hanging line. In order to ensure the adhesion between the pavement base and subbase, the excavator will spread the mixture and level it, and then repair it manually.
4. Roll forming:
20T vibratory roller is used for rolling, with the width within the full width of the road surface (including the shoulder, which should be watered before paving the mixture), and the length is generally 60cm segments (the specific length can be appropriately adjusted according to the actual situation on site). For straight sections, the rolling should be carried out from both sides of the road surface to the center of the road, and for curved sections, the rolling should be carried out from the inside out, with the rolling width of 1/2 overlapping each time, and the rolling must exceed the joint of two sections, and the rolling should be carried out after the full width of the road surface is completed. The rolling speed is controlled at 1.5 ~ 1.7 km/h, and then it is statically pressed once, and then it is vibrated for 4 ~ 6 times. The first two rolling speeds were controlled at 1.5 ~ 1.7 km/h, and the rolling speeds of 2.0 ~ 2.5 km/h were recorded four times and four times respectively. When the degree of compaction meets the design requirements, the surface shall be closed by static pressure at one time, and the rolling speed shall be controlled at 2.0 ~ 2.5 km/h. It is forbidden for the roller to turn around or suddenly brake on the completed or rolling section to ensure that the surface of the base is not damaged. If the mixture is dry, a small amount of water should be added in time. If there is looseness, peeling, segregation and alkali flooding, it should be handled in time to meet the requirements of construction specifications. During construction, on-site technicians and testers should do well in the tests of elevation, paving thickness, flatness, mixture gradation, water content, cement dosage and unconfined compressive strength.
suture
Transverse joint treatment
A) 1-2m shall be left at the junction of two operation sections constructed on the same day, and shall not be crushed. When the latter section is constructed, the part left by the former section shall be rolled together with the latter section.
B) On the construction site at the end of the last section every day, a square timber with the same thickness and length as the compacted thickness shall be attached to its vertical surface, which shall be perpendicular to the road centerline and fixed with steel bars. The square wood should be covered with plain soil to prevent damage, and the unpaved part should be filled with plain soil or other materials to ensure smooth traffic.
6. Health:
After the completion of rolling, water should be sprayed in time to ensure that it remains wet for seven days, and no vehicles are allowed to pass during this period. In order to protect the completed project, protective measures should be taken during the maintenance period to prevent vehicles from breaking into the base that has not reached the strength. It is necessary to arrange personnel to control traffic day and night, and it is strictly forbidden for heavy vehicles to pass. Do not turn around and brake suddenly on the test section.
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