| 摘要 |
A method for erecting a tower includes the steps of providing a first pre-cast section of concrete and positioning it atop a foundation. A radially-inwardly extending ledge is attached to an interior wall of the first pre-cast section and a plurality of jacks is positioned below the ledge in circumferentially spaced apart relation to one another. The ledge and the first pre-cast section are raised to a first height by operating jacks in an ascending mode. A second pre-cast section is positioned beneath the first pre-cast section after the first pre-cast section has been lifted to the first height. The first pre-cast section is lowered onto the second pre-cast section by operating the jacks in a descending mode or the second pre-cast section is lifted by operating the jacks in ascending mode. An assembly building that surrounds a base of the tower protects workers from inclement weather. |
