1、 Construction technology
1. Construction setting out
Construction setting out shall be done before construction. When restoring the center line, a pile shall be set every 15 ~ 20m in the straight section and every 10 ~ 15m in the curve section, and indicator piles shall be set outside the edge of the shoulders on both sides. The planned high hanging datum line of the edge shall be marked with prominent symbols on the indicator piles.
2. Mixing and transportation
The bottom layer of cement stabilized macadam shall be mixed together, and the mixing station shall be set in the open space in Baizhang interchange turntable. Before mixing, the water content of various specifications shall be measured, and the water consumption shall be adjusted according to the water content, weather conditions and the length of transportation distance to ensure that the water content of the mixture is uniform and appropriate. During construction in summer, the gravel can be watered first. The water content shall be 1.0% higher than the best water content, so that the mixture can be transported to the paving section, and the water content during rolling after paving shall not be less than the best value. The ash dosage shall be carried out according to the detection frequency and method of standard rules. In case of lack of ash dosage, ash shall be added in time to ensure that the ash dosage is controlled by 0.5% greater than the cooperation ratio and meets the needs of technical standards. Samples shall be taken in time for specimen forming
3. Side formwork
Before the construction of the water stable layer, the side formwork shall be erected at the hard shoulder and the part without planned kerb to prevent the water stable layer from pouring out of the planned sideline during the pouring construction of the water stable layer. When the side formwork is erected, the formwork setting out shall be carried out first, and the formwork calibration and inspection shall be carried out after the formwork is reinforced. Confirm that the formwork meets the planned needs and is approved by the supervising engineer. The pouring of water stable layer can be carried out only after the pouring of water stable layer is allowed
Before the formal commencement of the water stable layer, the test section with a length of 100 ~ 200m shall be paved at the address approved by the supervising engineer. In the process of paving the test section, special personnel shall be assigned to hang the line for measurement, make investigations and records, discuss and solve various problems found. The test section shall be carried out under the supervision of the supervising engineer. Assuming that the test section is approved and inspected by the supervising engineer, it can be used as part of the durable project. If any part of the test section is unqualified, it shall be excavated, and then the test of the test section shall be carried out until it reaches the standard required for compounding
Two pavers shall be selected for on-site paving, with a step-by-step joint paving work. The distance between the front and rear of the paver is 5 ~ 10m, and the paving speed is 5km / h. During paving, the paving speed shall be determined according to the mixing ability and transportation ability to prevent the paver from stopping for material. A three person team shall be set to follow the roller to eliminate the coarse aggregate belt or honeycomb in time, and make up the fine mixture in time. The paving shall be smooth. After the severe parts are excavated, they shall be supplemented with the mixture meeting the needs, and the excavation depth shall not be less than
(1) . immediately after paving and finishing, use the roller to follow the paver and roll within the full width. The rolling construction shall be carried out according to the procedure of static rolling - weak vibration - strong earthquake - Static Rolling. During the rolling construction, the traveling speed of the road roller shall be controlled at 1.5km/h ~ 3km / h
(2) . the rolling procedure shall be constructed according to the method admitted by the test section. During rolling, 1 / 2 wheel width shall be stacked, and it is necessary for the rear wheel to exceed the joint of the two sections. Some of them shall be rolled for about the same times, and two or three more times shall be rolled on both sides. The compaction thickness is 15cm. If the roller cannot reach it, it shall be compacted manually.
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