Quality and schedule of group welding on site has been improved through pre-assembly.

通过预组装，施工现场组焊质量和周期得到了保证。

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Furthermore, the paper studied on special construction process about thick slab welding technique, cast steel site-welding technique and cell cantilever assembly without scaffold technique.

在超高层的钢结构施工技术方面，本文则重点研究了现场厚板焊接技术、铸钢节点焊接技术和单元扩大悬臂安装施工技术的原理及技术要点。

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