The tensile and compressive strength of steel structure is relatively high, the member section is small, the weight is light, the structural performance is good, the construction speed is fast, and the environmental pollution is small, so the steel structure engineering is suitable for a variety of structural forms and places. Today, Jinan light steel structure summarizes the common quality accidents and accident causes of light steel structure engineering, let's see together.

　　轻型钢结构工程常见质量事故

　　Common quality accidents of light steel structure engineering

　　01

　　01

　　网架工程常见质量事故

　　Common quality accidents in grid structure engineering

　　（1）杆件弯曲变形或局部断裂；

　　(1) The bending deformation or local fracture of the bar;

　　（2）杆件封板或锥头焊缝连接破坏；

　　(2) The connection of sealing plate or cone head weld is damaged;

　　（3）节点变形或断裂；

　　(3) The joint is deformed or fractured;

　　（4）焊缝不饱满或有气泡、夹渣、微裂缝超过规定标准；

　　(4) The weld is not full or there are bubbles, slag inclusion and micro cracks, which exceed the specified standard;

　　（5）高强螺栓断裂或从球节点中拔出；

　　(5) The high strength bolt is broken or pulled out from the ball joint;

　　（6）杆件在节点相碰，上弦支撑时支座腹杆与支承结构相碰；

　　(6) The members collide at the nodes, and the web member of the support collides with the supporting structure when the upper chord is supported;

　　（7）支座节点位移；

　　(7) The displacement of bearing node;

　　（8）网架挠度过大，超过了设计规定相应设计值的1.15倍。

　　(8) The deflection of the grid is too large, which exceeds 1.15 times of the corresponding design value specified in the design.
                                                 

　　02

　　02

　　门式刚架工程常见质量事故

　　Common quality accidents in portal frame engineering

　　（1）主要构件变形、扭曲；

　　(1) Deformation and distortion of main components;

　　（2）预埋件不符图纸、规范要求，高差超标，间距超标；

　　(2) The embedded parts do not meet the requirements of drawings and specifications, the height difference exceeds the standard, and the spacing exceeds the standard;

　　（3）钢架整体垂直度和整体平面弯曲超差，梁柱端板孔位不对应，大小错位；

　　(3) The overall perpendicularity and overall plane bending of the steel frame are out of tolerance, and the hole positions of beam and column end plate are not corresponding, and the size is misplaced;

　　（4）主要受力节点焊缝不饱满或有气泡、夹渣、微裂缝超过规定标准等；

　　(4) The weld seam of the main load-bearing joints is not full or there are bubbles, slag inclusion and microcracks exceeding the specified standard;

　　（5）附属稳定结构如：支撑、系杆、隅撑等位置不合理、或加工错误；

　　(5) Auxiliary stable structures such as: unreasonable position of support, tie bar and corner brace, or wrong processing;

　　（6）次要构件不符合质量要求。

　　(6) Secondary components do not meet the quality requirements.

　　主要原因

　　main cause

　　01

　　01

　　设计原因

　　Design reasons

　　（1）结构形式选择不合理，杆件截面匹配不合理，忽视构件初弯曲、初偏心和次应的影响，设荷载低算和漏算或荷载组合不当；

　　(1) The results show that the selection of structural form is unreasonable, the cross-section matching of members is unreasonable, the influence of initial bending, initial eccentricity and secondary stress of members is ignored, and the load calculation is low or omitted or the load combination is improper;

　　（2）材料选择不合理；

　　(2) The material selection is unreasonable;

　　（3）计算方法选择、假设条件、电算程序有误未能发现；

　　(3) There are errors in the selection of calculation methods, assumptions and computer programs;

　　（4）结构设计计算后，不经复核就进行材料代换，导致超设计值强度构件出现；

　　(4) After structural design and calculation, material replacement is carried out without review, resulting in the appearance of strength components beyond the design value;

　　（5）图纸错误或不全。如尺寸标注混乱，设计说明不清，对材料、工艺要求、施工程序及特殊要求部位有遗漏；

　　(5) The drawing is wrong or incomplete. For example, the dimensions are confused, the design description is not clear, and there are omissions in materials, process requirements, construction procedures and special requirements;

　　（6）节点构造有误，细部考虑不全面。

　　(6) The node structure is wrong, and the detailed consideration is not comprehensive.

　　02

　　02

　　加工原因

　　Processing reason

　　（1）管理混乱，不同规格、钢号、材质材料混杂使用；

　　(1) Management confusion, different specifications, steel grades, materials mixed use;

　　（2）构件下料尺寸有误，构件长细比不符设计要求；

　　(2) The cutting size of the component is wrong, and the slenderness ratio of the component does not meet the design requirements;

　　（3）网架杆件剖口未打、对接时焊缝不加衬管或不按设计要求焊接；

　　(3) When the grid member is not cut, the welding seam is not lined or welded according to the design requirements;

　　（4）连接高强螺栓不合格；

　　(4) The high-strength bolts are unqualified;

　　（5）构件加工有缺陷，螺栓球孔角度偏差大；

　　(5) There are defects in the processing of components, and the angle deviation of bolt ball hole is large;

　　（6）焊缝质量差，焊角尺寸未达到设计要求。

　　(6) The weld quality is poor, and the fillet size does not meet the design requirements.

　　03

　　03

　　网架安装原因

　　Reasons for grid installation

　　（1）地面拼装时支撑点不均匀，受力不合理，拼装时误差积累，个别杆件错误，导致受力改变，造成网架或个别杆件变形。

　　(1) During the ground assembly, the support points are not uniform, the force is unreasonable, the error accumulation during assembly, and the error of individual members leads to the change of stress, resulting in the deformation of grid structure or individual members.

　　（2）焊接工艺、焊接顺序有误，产生焊接应力，导致变形。

　　(2) Welding process and welding sequence are wrong, resulting in welding stress and deformation.

　　（3）整体吊装时，吊点选择不合理，没有对吊点进行反力验算、杆件超应力验算、挠度验算、对超应力处进行必要加固措施。

　　(3) In the integral hoisting, the selection of lifting point is unreasonable, and there is no counter force checking calculation, bar overstress checking calculation, deflection checking calculation and necessary reinforcement measures for the over stress part.

　　（4）整体吊装时，各吊点起升速度不同，位移、高差超过允许范围，导致变形、破坏。

　　(4) During the integral hoisting, the lifting speed of each lifting point is different, and the displacement and height difference exceed the allowable range, resulting in deformation and damage.

　　（5）施工方案选择错误，没有根据网架结构形式、现场施工条件合理选择方案，安装时不能形成几何不变体系，导致变形、破坏。

　　(5) The selection of construction scheme is wrong, and the scheme is not reasonably selected according to the grid structure form and site construction conditions, and the geometric invariant system cannot be formed during installation, resulting in deformation and damage.

　　（6）网架支座预埋件、预埋螺栓或柱顶偏移较大，就位困难，强迫就位，导致改变支座受力条件，杆件变形。

　　(6) The displacement of embedded parts, embedded bolts or column top of grid support is large, so it is difficult to put them in place, which leads to change of bearing stress conditions and deformation of members.

　　（7）安装人员粗心大意，杆件位置、球角度有误。

　　(7) The installation personnel is careless, and the position of the rod and the angle of the ball are wrong.

　　（8）上弦支撑时，误差积累过大，导致支座位移，腹杆与支撑面相碰。

　　(8) When the upper chord is supported, the error accumulation is too large, which leads to the support displacement and the web member collides with the support surface.

　　04

　　04

　　门式刚架安装原因

　　Installation reasons of portal frame

　　（1）较长构件运输、堆放时垫放不平整，长时间放置，导致变形、扭曲。

　　(1) When the long components are transported and stacked, the cushion is not smooth, and it is placed for a long time, resulting in deformation and distortion.

　　（2）预埋螺栓位置不正，安装时没有复测、没有校正，导致柱、梁变形、扭曲，钢架整体垂直度、平面弯曲超差。

　　(2) The position of embedded bolts is not correct, and there is no retest and correction during installation, which leads to deformation and distortion of columns and beams, and the overall verticality and plane bending of steel frame are out of tolerance.

　　（3）梁柱端板孔位不对应、错位，安装时端板没有对正，螺栓紧固时没有按顺序紧固。

　　(3) The hole positions of beam and column end plates are not corresponding and misplaced, the end plates are not aligned during installation, and the bolts are not tightened in sequence.

　　（4）现场焊接时没有按焊接规程操作或焊工技术问题，导致焊缝不饱满或有气泡、夹渣、微裂缝。

　　(4) The welding seam is not full or there are bubbles, slag inclusion and micro cracks due to the lack of operation according to the welding procedures or the welder's technical problems.

　　（5）安装时没有详细、认真领会图纸，导致个别构件位置错误。

　　(5) The installation did not understand the drawings in detail and carefully, resulting in the wrong position of individual components.

　　（6）安装前没有按工程实际情况制订详细施工方案、进行技术交底，导致工序颠倒等现像。

　　(6) Before installation, the detailed construction scheme and technical disclosure were not formulated according to the actual situation of the project, which led to the inversion of working procedures.

　　（7）施工不按顺序进行，钢架没有形成稳定结构进行下道工序施工，导致整体失稳。

　　(7) The construction is not carried out in sequence, and the steel frame does not form a stable structure for the next construction process, which leads to the overall instability.

　　（8）钢柱刚接插入式柱基时，混凝土达不到强度或柱脚固定不牢，进行上部构件安装，导致结构失稳。

　　(8) When the steel column is rigidly connected to the plug-in column base, the concrete cannot reach the strength or the column base is not fixed firmly, so the upper component is installed, which leads to the structural instability.

　　以上是济南轻型钢结构对常见质量事故及原因分析，想要了解更多相关内容请继续关注我们的http://www.jnghbxg.com网站。

　　The above is the common quality accident and cause analysis of Jinan light steel structure. If you want to know more about it, please continue to pay attention to our http://www.jnghbxg.com Website.