1 Advantages of slipform paving construction technology
Slipform paving is the main technical method of concrete pavement construction, and its construction quality is directly related to pavement smoothness. Strengthening the quality management of slipform paving construction technology has become an important way for highway construction units to control pavement construction quality and improve pavement smoothness.
2 Slipform paving construction technology construction technology
2. 1 Set the guide line of the sensor.
Generally, the length of the guide line should be controlled at around 1000m, and the distance of the guide line should be controlled within the range of 1 ~ 1.5m from the pavement to be paved. Extend the pavement to the measured guide line elevation, add 20cm as its height, and ensure that the spacing of each guide bar is controlled at 5 ~ 10 m. Before paving, retest should be carried out to ensure that the construction accuracy meets the expected requirements [1].
2.2 Adjustment and Placement of Paver
When the paver enters the site and completes the installation, it should stop at the initial position to ensure that the front and rear of the left and right templates are parallel to the guide line and equidistant. According to the preset distance between the template and the guide line, adjust the front and rear steering sensors to ensure that the front and rear templates and the guide line are always in a parallel state. After the direction adjustment is completed, find two points in the longitudinal and transverse directions of the subgrade and control them into a rectangular state.
2.3 Transportation of concrete
Use dump trucks to transport the mixed concrete to the paving site. During transportation, ensure that the concrete will not dry, separate and leak slurry. Avoid excessive accumulation during unloading. It is forbidden to discharge more than 1.5m 2.4 paving construction, start the paver for automatic leveling and automatic steering sensor, and drive forward. When the distributor touches the concrete, the paver starts the secondary distribution construction. Adjust the position of the metering door to ensure that the materials in the vibrating bin can fully enter. When the vibrator is in complete contact with the concrete, the vibrator can be started. The trowel and the left and right templates squeeze the vibrated concrete, and the concrete pavement is formed by installing dowel bars, connecting ribs and leveling beams. After the paving on the same day, the tail molds on both sides should be closed according to 1 ~ 2 cm to ensure the smooth paving the next day [2]. 2.5 galling construction usually in highway engineering, concrete pavement should be slotted. When flexible tensile and anti-sliding structures are used in concrete pavement construction, a napping curing machine should be configured to ensure the smoothness of the pavement.
3 slipform paving construction quality control
3. 1 Strengthen the quality of base construction
In the highway structure system, the pavement base bears the load of the surface layer, and its construction quality has a great influence on the surface layer. In the process of construction, we must strictly control the quality of grass-roots construction to ensure that all indicators meet the technical requirements. Ensure that the rigidity, strength and smoothness of the base meet the requirements. In the process of highway construction, all kinds of transport vehicles travel to and from the construction section, which is a great challenge to the performance and quality of pavement base. Especially when the driving direction of vehicles changes dramatically, it will cause a great burden on the base, resulting in potholes and looseness on the surface of the base. When the paver passes through these positions, subsidence will occur, which will affect the paving quality and then lead to the decrease of pavement smoothness.
3.2 Strictly control the slump of concrete
In order to ensure the quality of pavement, the slump of concrete is generally controlled at 3.5~4.0, and the specific value depends on the actual situation during construction. To control the slump of concrete, it is necessary to control the water content of raw materials. Mixing equipment cannot monitor the moisture content of raw materials. If the water content of raw materials is unstable, the slump of mixed concrete changes greatly, which affects the smoothness of pavement. Therefore, it is necessary to do a good job in the drainage and waterproof facilities of the raw material site, and cover the piles to avoid the impact of rainfall.
According to the actual situation of expressway project, combined with the characteristics of concrete pavement paved with synovium, the targeted quality control methods are explored. Through practice, the quality of concrete pavement paved by slipform has been further improved and played an effective role in concrete pavement construction.
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