The rigid frame with middle or small size span,such as quadrangular pyramid frame, can be installed by using intrinsic building scaffold or putting up part scaffold.
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- 中小跨度刚度较好的网架,如正放四角锥,正交正放桁架。可利用原有建筑物或搭设局部脚手架通过高空滑移进行安装。