推荐回答（4个）
当一根立杆长度满足不了支撑高度，需要两根立杆对接，这时看具体需要分为两种情况：一是使用直径48mm的立杆时，可直接在立杆的一段焊上连接套管，安装时直接把两根立杆对接即可；二是当使用直径60mm的立杆时，就不能再像48管那样焊连接套管了，因为60管外再焊套管直径太大，会使立杆重量增大，安装起来非常不便。所以要使用比60管更细的连接棒，在立杆和连接棒上打孔，将连接棒插入立杆后在适合长度将两者的孔对齐，用销子插入固定，然后再用另一根立杆插入连接棒，用上面的方法同样固定，对接就算完成了。规范规定盘扣脚手架在安装时，相邻两根立杆的对接不能在同一水平面上，解决这个问题的方法一般是竖好一根立杆后，在与其相邻的立杆底部加一根短的立杆，用连接棒与正常长度的立杆连接。当然，长度要根据实际需要设置好，确保所有立杆的连接盘都在同一水平面上。水平杆扣在连接盘上以后，应该再用锤子敲紧，有人反应盘扣脚手架安装以后会摇晃，其实是因为水平杆扣上以后没用锤子敲紧的缘故，否则盘扣脚手架安装完成以后是非常稳固的。
前期应做好支撑体系的专项施工方案设计，并由总包单位放线定位，使支撑体系横平竖直，以保证后期剪刀撑和整体连杆的设置，确保其整体稳定性和抗倾覆性;盘扣式脚手架安装基础必须要夯实平整并采取混凝土硬化措施;盘扣式脚手架宜使用同一标高的梁板底板的标高范围，对于高度和跨度较大的单一构件支承架使用时对横杆进行拉力和立杆轴向压力(临界力)的验算，确保架体的稳定性和安全性;架体搭设完成后要加设足够的剪刀撑，在顶托与架体横杆300-500mm之间的距离要增设足够的水平拉杆，使其整体稳定性得到可靠的保证;落地式双排承插型盘扣钢管脚手架搭设的立杆纵距为1.50m，横距为0.9m，步距为1.50m，脚手架的连墙件竖向间距为3.0m，水平间距为4.50m，操作平台满铺脚手板。脚手架上下爬梯采用定型挂扣式钢梯，平台满铺钢制脚手板，架体设在左右幅墩柱中间，梯步、休息平台宽度0.9m，楼梯长1.8，高1.5m，基础按脚手架要求处理，通道护身栏杆：上部高1.2m，中部高0.6米，下设0.18m高挡脚板，梯步护手高0.9m，爬梯与架体同步搭设。在盘扣式脚手架架体搭设完成之后，需要加设足够的剪刀撑结构，在顶托与架体横杆之间三百-五百毫米的距离之间，需要增设足够的水平拉杆结构，这样可以使盘扣式脚手架的整体稳定性得到可靠的保证。
安装时，螺栓拧紧扭力矩不应小于40N·m，且不应大于65N·m[7]；现场实际施工中，操作工人对螺栓拧紧扭力矩的大小常常缺乏具体的感性认识，总以为认为把螺母拧的越紧越好，常常把扣件螺母（尤其是保险扣件）拧紧到拧不动的位置，而当扭力矩大于65N·m时，已超过《钢管脚手架扣件规范》中的扣件试压值，并不能保证扣件质量及安全。因此，现场施工技术人员除做好事前的施工交底外，事中还应要拿着扭力扳手到班组第一线，根据抽样检查数目与质量判定标准，按随机分布原则直接检查作业工人刚扭紧的扣件，扭力矩小于40N·m的必须重新拧紧至合格，扭力矩大于65N·m致扣件损坏的及时处理。
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