| 摘要 |
A chimney is constructed by simultaneously forming an outer concrete sheath thereof and adding sections to an inner cylindrical body thereof. In a first embodiment an uppermost section of the body supports a slip form for forming the outer sheath and is stepwise hoisted by a hoist mounted on a foundation. Periodically, as the uppermost section is sufficiently hoisted, new sections are added and joined to the uppermost section, thus forming newly joined uppermost sections. In a second embodiment, a lowermost section of the body supports a crane which supports a slip form for forming the outer sheath. The crane is stepwise hoisted upwardly along the lowermost section, and periodically as the crane reaches the top of the lowermost section, additional sections are joined to the top of the lowermost section, thus forming newly joined lowermost sections. |
