The steel structural members of the main span of Nanpu bridge require high dimensional accuracy. The 140,000 sets of bolts were all fitted and bored on the spot with advanced international level.

南浦大桥主桥钢结构构件尺寸准确，全桥14万套螺栓现场安装无一扩孔，达到国际先进水平。

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The result shows that the tensioning force of main span is mainly undertaken by rigid frame.

结果表明，中跨系杆张拉力主要由刚构承担。

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The paper describes in detail the features of the closing of the main span, the construction plan and the detailed closing method and procedure.

文章详细介绍了该桥主跨跨中合龙的特点、合龙的施工方案以及具体的合龙方法和步骤。

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