1、 The bolt thread is damaged and the nut cannot be screwed in at will, which will affect the installation of the bolt.

1、原因分析：螺纹纽扣腐蚀严重。

1. Cause analysis: the threaded buttons are severely corroded.

2、解决方法：

2. Solution:

钢架螺栓使用前一定要选好，清洗除锈后进行预置。

Steel frame bolts must be selected before use, and preset after cleaning and derusting.

被螺纹损坏的螺栓不能用作临时螺栓，严禁强行插入螺孔。

Bolts damaged by threads cannot be used as temporary bolts, and forced insertion into screw holes is strictly prohibited.

预置螺栓组件一定要成套存放，使用过程中不能互换。

The preset bolt components must be stored in complete sets and cannot be interchanged during use.

二、现场焊接现象：质量难以保证;设计要求一定要完全穿透的一级和二级焊缝不使用声波测试;地板上的主梁和柱子没有焊接;引弧板不用于焊接。

2、 On site welding phenomenon: the quality is difficult to guarantee; Acoustic testing is not used for primary and secondary welds that must be completely penetrated according to the design requirements; The main beam and column on the floor are not welded; Run on plates are not used for welding.

1、解决方法：钢结构焊接前，检查焊条合格证，按设计要求选用焊条，按使用说明书和程序使用焊条，焊条不得有裂纹和焊缝。焊缝表面，焊缝不应有气孔、夹渣、弧坑裂纹，层焊缝不应有咬边、焊缝欠充等问题，一级和二级焊缝将按要求进行无损检测，焊工一定要在规定的焊缝和位置进行检查，不合格焊缝不得擅自加工，修改后确定工艺，同一部位补焊次数不得超过两倍。

1. Solution: before steel structure welding, check the welding rod certificate, select the welding rod according to the design requirements, use the welding rod according to the operation manual and procedures, and the welding rod shall be free of cracks and welds. On the weld surface, the weld shall be free of pores, slag inclusion, crater cracks, undercut, underfill and other problems in the first layer of weld. The first and second level welds shall be subject to nondestructive testing as required. The welder must check the specified welds and positions. The unqualified welds shall not be processed without authorization. The process shall be determined after modification, and the repair welding times of the same part shall not exceed twice.

三、螺栓设备表面不符合要求，使螺栓安装困难或螺栓拧紧程度不符合设计要求。

3、 The surface of bolt equipment does not meet the requirements, which makes it difficult to install bolts or the tightening degree of bolts does not meet the design requirements.

1、原因分析：

1. Cause analysis:

钢架表面有浮锈、油渍等杂质，螺栓孔有毛刺和焊缝。

There are floating rust, oil stain and other impurities on the surface of the steel frame, and there are burrs and welds in the bolt holes.

螺栓安装面经处理仍有问题。

There are still problems on the bolt mounting surface after treatment.

2、解决方法：

2. Solution:

螺栓表面的浮锈、油污和螺栓孔的缺陷需要一一清理。使用前一定要进行防锈处理，因此装配时使用的螺栓不得用于正式装配。螺栓一定要由专人保管和分配。

The floating rust, oil stain and bolt hole defects on the bolt surface need to be cleaned one by one. Anti rust treatment must be carried out before use, so the bolts used during assembly shall not be used for formal assembly. Bolts must be kept and distributed by special personnel.

搬运安装面时，应考虑施工安装顺序，避免在钢结构上重复操作，并在吊装前尽量固定好。

When handling the installation surface, the construction and installation sequence shall be considered to avoid repeated operation on the steel structure, and it shall be fixed as far as possible before hoisting.

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