施工手册(第四版)第十四章起重设备与混凝土结构吊装工程14-2-6-人字拔杆

----------------------------精品word文档值得下载值得拥有------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------精品word文档值得下载值得拥有----------------------------------------------14-2-6人字拔杆人字拔杆是由两根圆木或钢管、缆风、滑车组、导向滑车等组成。在人字拔杆的顶部交叉处，悬挂滑车组。拔杆下端两脚的距离约为高度的1/2~1/3。缆风的数量根据拔杆的起重量和起重高度决定，一般不少于5根（图14-55）。图14-55人字拔杆1-圆木或钢管；2-缆风；3-起重滑车组；4-导向滑车；5-拉索；6-主缆风人字拔杆的起重性能见表14-73及表14-74。人字拔杆的接长方法与独脚拔杆基本相同。人字拔杆的竖立可利用起重机械吊立，也可另立一副小的人字拔杆起扳。人字拔杆的移动方法与独脚拔杆基本相同（图14-56）。图14-56人字拔杆的移动（a）平移；（b）横移1-人字拔杆；2-缆风；3-移动滑车组；4-保险溜绳；5-滚动支座；6-枕木；7-拉索圆木人字拔杆的起重性能表14-73注：α—圆木与地面夹角。钢管人字拔杆的起重性能表14-745771001803090012095579036822859633082577100180309001238657613739973576069657710018030900135945780775799025155125771001803090012387577164982601818051577100180309001213857213119215891832657710018030900123595790368223610760535771001803090012356576135286143791742577100180309001235557508786970469327917088100343355274101229944325833379170881003433552751018667329388320081708810034335610710158115250150052217088100343356108101000180059871732170881003433542951010741941426870171708810034335618410187866086962880217088100343356185101775831174086674170881003433561091010860143735728461708810034335611010115220721601491617088100343355237101027041605702709170881003433552381012293648614254