How is the asphalt concrete base layer connected?
In the construction of asphalt concrete for sports track and field venues, due to different competition projects, many places will occur during the asphalt concrete paving process. Due to the needs of the plastic surface layer, all the places where the soil is exposed need to be smooth and not high and low. Inequality.
The places where mechanical asphalt concrete and artificial asphalt concrete are laid are mostly short in length and have less time to spread. These areas are generally artificially paved, followed by mechanical paving, and the elevation of the place is mainly based on mechanical paving. With the area of ​​artificial paving followed by the place where the machinery is paved, do not trim the surface of the machinery paving. Use bamboo rafts to smooth the asphalt concrete by pushing and pulling. The surface is slightly higher than the mechanical paving surface by about 1~2mm.
Horizontal access, which is common on the construction site, there are two kinds of horizontal joints on the sports grounds, and on the day of work on the day of the day, this type of joint is the one where the paving and roller compaction are completed and the labor is immediately near the joint. In a straight line, the excess asphalt concrete is planed by hand to leave a straight rake. After the rake is covered with hot asphalt, it is covered with hot asphalt concrete. After about 10 to 20 minutes, the excess asphalt concrete is removed, and hot iron rakes are used to gently tamping the place where the rake is connected. Hot asphalt concrete is used for leveling and smoothing. As far as possible, new asphalt concrete is not left on the surface that has been crushed, and then it is compacted manually by hand-guided roller or plate vibrator, and finally compacted by steel wheels. 1.4.28.1.
Longitudinal access. There are sometimes longitudinal joints at the track and field venues, the main part of which is on the main track. First of all, we must calculate the position of the joint, and leave the joint at the boundary between the main track. We cannot leave the longitudinal joint in the middle of the main track to prevent cracking of the asphalt concrete in the future, resulting in cracking of the plastic surface. Longitudinal joints generally appear on the same day, such as the main track area of ​​the 400m track and field venue. In the morning, asphalt concrete is lapped, four runways, and four other runways in the afternoon. When splicing, the screed of the asphalt concrete paver shall be placed approximately 5~10cm above the first four runways already completed. After being paved at the paving machine at room temperature (20°C), the screed may be directly rolled and subjected to low-temperature operation. In the meantime, it should be done by a skilled worker at random after finishing, but no artificial large area can be used to sifting the asphalt mixture, and it must not be scattered on the compacted asphalt concrete. When working on a longitudinal seam roller, it is first pressed against the longitudinal seam of the concrete. The steel roller of the roller must extend over the finished asphalt concrete, about 10 to 20 cm. See Figure 1.4.28.2.
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