Before the asphalt concrete paving operation, the construction unit shall select the form and quantity of the road roller according to the conditions of the project site and the construction progress of the project.

The compaction of asphalt concrete relates to the quality of the asphalt concrete base and the flatness of the surface. As the roller compaction work is divided into initial compaction, recompaction and final compaction, the compaction at each stage is not the same as the requirements for the compactor. Therefore, it is very important to choose the combination of the compactor and the rolling sequence. After the asphalt concrete paving compaction work, the best combination of the vibratory roller combination of the steel cylinder static roller and the tire roller is selected. The number of general road rollers shall be determined by the amount of daily completion and the complexity of site conditions. However, for the construction of sports track and field venues, no matter how much the asphalt concrete paving quantity changes, more than two rollers are required. The asphalt concrete compaction work must be completed by the combination of a light roller, a heavy-duty roller and a small roller. In addition, the conditions of sports venues are complex. Many places must be equipped with artificial boring machines in order to guarantee the standards of project quality.

The weight and weight of the roller can be selected with reference to the following data:

Two-wheel steel drum roller, choose 6~8t;

Three-wheel drum roller, choose 8~12t;

Tyre roller, choose 12~20t;

Steel drum vibration roller, choose 2~6t;

Walk-behind small vibratory roller, choose 1~2t;

Hand-held vibration boring machine, weight not less than 180kg, vibration frequency not less than 3,000 times / min.

Intermediates

Raw material medicine refers to the raw material medicine used in the production of various preparations. It is an effective ingredient in the preparation. It is used as a medicinal powder, crystal, extract, etc., prepared by chemical synthesis, plant extraction or biotechnology. A substance that the patient cannot take directly.

Pharmaceutical intermediates , Pharmaceutical additives , Veterinary drug intermediates , Veterinary additives , Organic intermediates

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