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：螺紋紐扣腐蝕嚴重。

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

2、解決方法：

2. Solution:

鋼架螺栓使用前一定要選好，清洗除銹后進行預置。

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

被螺紋損壞的螺栓不能用作臨時螺栓，嚴禁強行插入螺孔。

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

預置螺栓組件一定要成套存放，使用過程中不能互換。

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

二、現場焊接現象：質量難以保證;設計要求一定要完全穿透的一級和二級焊縫不使用聲波測試;地板上的主梁和柱子沒有焊接;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、解決方法：鋼結構焊接前，檢查焊條合格證，按設計要求選用焊條，按使用說明書和程序使用焊條，焊條不得有裂紋和焊縫。焊縫表面，焊縫不應有氣孔、夾渣、弧坑裂紋，層焊縫不應有咬邊、焊縫欠充等問題，一級和二級焊縫將按要求進行無損檢測，焊工一定要在規定的焊縫和位置進行檢查，不合格焊縫不得擅自加工，修改后確定工藝，同一部位補焊次數不得超過兩倍。

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、螺栓設備表面不符合要求，使螺栓安裝困難或螺栓擰緊程度不符合設計要求。

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:

鋼架表面有浮銹、油漬等雜質，螺栓孔有毛刺和焊縫。

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.

螺栓安裝面經處理仍有問題。

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

2、解決方法：

2. Solution:

螺栓表面的浮銹、油污和螺栓孔的缺陷需要一一清理。使用前一定要進行防銹處理，因此裝配時使用的螺栓不得用于正式裝配。螺栓一定要由專人保管和分配。

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.

搬運安裝面時，應考慮施工安裝順序，避免在鋼結構上重復操作，并在吊裝前盡量固定好。

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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