8.1.1 History

The history of slipforming can be traced back to the 1920s and before. In the late 1920s, a number of concrete structures were cast using a system of formwork that was moving during the placing of concrete. At that time, forms were being raised by hand-screw jacks and job-built wooden yokes. Laborers would pull ropes that would raise the forms. Early application of slipform was limited to storage bins and silos with a constant thickness all over the wall height.

Подпись: Copyright © Marcel Dekker, Inc. All rights reserved.Since the late 1950s, slipform construction has come a long way; locomotion is accomplished by jacks climbing on smooth steel rods or pipes anchored at the base of the structure and the system has been employed successfully and economically in situa­tions which have required discontinuity of section. As a result, the list of recent application expanded to include towers cores, bridge piers, power plant cooling, chimney shafts, pylons, and the legs of oil rig platforms.