A CONSTRUCTION METHOD FOR AN UNBONDED PRESTRESSED LARGE-DIAMETER REINFORCED-CONCRETE THIN-WALLED CIRCULAR TANK

The present invention discloses a construction method for an unbonded prestressed large-diameter reinforced-concrete thin-walled circular tank, comprising the following steps: carrying out surveying and setting-out at the construction site on the basis of tank design conditions; carrying out earth excavation on the basis of the results of surveying and setting-out; constructing the foundation cushion of the tank; binding the bars of the tank floor and erect the formwork; placing tank floor concrete; erecting the wall formwork and binding the wall bars; placing and binding the wall unbonded prestressing bars; placing and curing wall concrete; prestressed tensioning the wall unbonded prestressing bars; blocking anchor ends of the wall unbonded prestressing bars; performing watertightness sealing for tank floor cup; and performing overflowing water test on the tank. The construction method effectively reduces wall thickness at the same time of ensuring designed functions of a circular tank during the construction of a circular tank, thereby lowering the construction cost and reducing the difficulty in construction of the tank. Upper large formwork 200 mm high formwork inside the cup Find sand inside the cup Tank floor Fig. 2