Precast concrete silo complex and a method of constructing it

Abstract

A precast concrete silo complex and a method of constructing it, in which quarter-cylindrical precast concrete members, constituting unit members, are each provided with a pair of radially protruding couplings near both the ends of the member, and the unit members are arranged to form unit cylinders. The unit cylinders are arranged lengthwise and crosswise, with the couplings facing the couplings of adjacent unit cylinders for defining a coupling space between each two adjacent unit cylinders. Horizontal clamp rods extend through the coupling spaces between the end portions of the unit members and between the couplings, and concrete is provided in the coupling spaces. The horizontal clamp rods are tensioned to clamp the end portions of the unit members and the couplings, to give prestress to the concrete, thereby combining the adjacent unit cylinders and solidifying the unit cylinders arranged lengthwise and crosswise. The unit members are joined vertically by mortar, and vertical clamp rods extend vertically set the unit members and are prestressed to apply prestress to the assembled unit cylinders, solidifying the complex vertically. Thus silo cylinders having a desired height are provided which are solidified lengthwise and crosswise, and which the inside of the silo cylinders constitute the main silo spaces and the spaces formed among the adjacent silo cylinders constitute sub silo spaces.