Construction procedure of vertical storage tank foundation

The foundation construction procedures of vertical storage tanks include: laying out and positioning, earthwork excavation, pouring concrete cushion, elastic line, supporting inner membrane, binding steel bar, supporting outer formwork, pouring concrete, demoulding backfill, asphalt sand anticorrosion, and foundation delivery. The following describes the construction measures of each program.

1. The earth and stone works are generally constructed by mechanical excavation and manual trench cleaning. The concrete cushion can be constructed after the circular earth excavation is qualified.

2. The amount of concrete on the bottom cap is generally large. Before construction, the temperature should be checked according to the local material supply and climatic conditions. When the temperature difference between inside and outside exceeds 25 degrees Celsius, construction control should be carried out according to the use requirements of large-volume concrete.

3. The concrete can adopt full-layered or segmented layered construction method, and it is necessary to ensure that the continuous concrete pouring can not form construction joints. After the concrete is poured, it should be cured in time, demolished and backfilled with external earthwork.

4. After the construction of the ring wall concrete is completed, the internal foundation can be processed in accordance with the design requirements. After the foundation soil has been drilled, compacted and inspected, the foundation soil should be compacted according to the design requirements, and then backfilled with earth or sand according to the design requirements stone.

5. The materials used in the construction of asphalt sand must meet the requirements. They must be mixed evenly according to the mix ratio, and evenly spread with rollers. The last layer of hot asphalt is applied and flattened with a hot soldering iron. The asphalt sand and the base layer shall be firmly, densely and smoothly combined.

6. Finally measure and mark the initial elevation of the foundation axis and the settlement observation point, and then the vertical storage tank can be delivered and installed.