用普通脚手钢管架设120m高竖井架的成功应用

The successful application of 120 m high shaft set up with ordinary steel pipe scaffold

为了解决普通脚手钢管扣件竖井架在大型冷却塔工程施工中的运用,分析研究并选择了比较经济合理、安全可靠的结构组合形式来独立完成120m超高井架的施工.由于普通脚手钢管扣件式脚手架犤1犦在以往的施工中,一般高度都在100m以下,且管壁较薄,直径小,因此,该技术关键是按初步选定的竖井架断面和缆风绳直径,通过分析各杆件及组合断面的力学特性,计算出竖井架的截面惯性矩、抗弯刚度、回转半径及格构折减系数,来校核竖井架杆身正应力、局部稳定性、整体稳定性和自振周期,从而保证普通脚手钢管扣件竖井架在大型冷却塔工程施工中的安全性.

In order to apply ordinary steel pipe bucklized scaffold on large sized cooling tower construction, the paper analyses and studies on how to choose comparatively economic, rational and safe structures to independantly accomplish the 120 m super high shaft construction. The ordinary steel pipe bucklized scaffold in past constructions is normally within 100 m high with thin pipe wall and small diameter. Therefore, the key of this technique is to calibrate the section and diameter of shaft, partial stability, intergral stability and self vibration period by studying the mechanical properties of components and composit sections, and by analysing the inertia of boundary surface, bending strength, radius of gyration and lattice coefficient to guarantee the security of the ordinary scaffolding steel pipe bucklized shaft.