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.

　　輕型鋼結構工程常見質量事故

　　Common quality accidents of light steel structure engineering

　　01

　　01

　　網架工程常見質量事故

　　Common quality accidents in grid structure engineering

　　（1）桿件彎曲變形或局部斷裂；

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

　　（2）桿件封板或錐頭焊縫連接破壞；

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

　　（3）節點變形或斷裂；

　　(3) The joint is deformed or fractured;

　　（4）焊縫不飽滿或有氣泡、夾渣、微裂縫超過規定標準；

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

　　（5）高強螺栓斷裂或從球節點中拔出；

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

　　（6）桿件在節點相碰，上弦支撐時支座腹桿與支承結構相碰；

　　(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）支座節點位移；

　　(7) The displacement of bearing node;

　　（8）網架撓度過大，超過了設計規定相應設計值的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

　　門式剛架工程常見質量事故

　　Common quality accidents in portal frame engineering

　　（1）主要構件變形、扭曲；

　　(1) Deformation and distortion of main components;

　　（2）預埋件不符圖紙、規范要求，高差超標，間距超標；

　　(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）鋼架整體垂直度和整體平面彎曲超差，梁柱端板孔位不對應，大小錯位；

　　(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）主要受力節點焊縫不飽滿或有氣泡、夾渣、微裂縫超過規定標準等；

　　(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）附屬穩定結構如：支撐、系桿、隅撐等位置不合理、或加工錯誤；

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

　　（6）次要構件不符合質量要求。

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

　　主要原因

　　main cause

　　01

　　01

　　設計原因

　　Design reasons

　　（1）結構形式選擇不合理，桿件截面匹配不合理，忽視構件初彎曲、初偏心和次應的影響，設荷載低算和漏算或荷載組合不當；

　　(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）材料選擇不合理；

　　(2) The material selection is unreasonable;

　　（3）計算方法選擇、假設條件、電算程序有誤未能發現；

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

　　（4）結構設計計算后，不經復核就進行材料代換，導致超設計值強度構件出現；

　　(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）圖紙錯誤或不全。如尺寸標注混亂，設計說明不清，對材料、工藝要求、施工程序及特殊要求部位有遺漏；

　　(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）節點構造有誤，細部考慮不。

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

　　02

　　02

　　加工原因

　　Processing reason

　　（1）管理混亂，不同規格、鋼號、材質材料混雜使用；

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

　　（2）構件下料尺寸有誤，構件長細比不符設計要求；

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

　　（3）網架桿件剖口未打、對接時焊縫不加襯管或不按設計要求焊接；

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

　　（4）連接高強螺栓不合格；

　　(4) The high-strength bolts are unqualified;

　　（5）構件加工有缺陷，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）焊縫質量差，焊角尺寸未達到設計要求。

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

　　03

　　03

　　網架安裝原因

　　Reasons for grid installation

　　（1）地面拼裝時支撐點不均勻，受力不合理，拼裝時誤差積累，個別桿件錯誤，導致受力改變，造成網架或個別桿件變形。

　　(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）焊接工藝、焊接順序有誤，產生焊接應力，導致變形。

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

　　（3）整體吊裝時，吊點選擇不合理，沒有對吊點進行反力驗算、桿件超應力驗算、撓度驗算、對超應力處進行必要加固措施。

　　(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）整體吊裝時，各吊點起升速度不同，位移、高差超過允許范圍，導致變形、破壞。

　　(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）施工方案選擇錯誤，沒有根據網架結構形式、現場施工條件合理選擇方案，安裝時不能形成幾何不變體系，導致變形、破壞。

　　(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）網架支座預埋件、預埋螺栓或柱頂偏移較大，就位困難，強迫就位，導致改變支座受力條件，桿件變形。

　　(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）安裝人員粗心大意，桿件位置、球角度有誤。

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

　　（8）上弦支撐時，誤差積累過大，導致支座位移，腹桿與支撐面相碰。

　　(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

　　門式剛架安裝原因

　　Installation reasons of portal frame

　　（1）較長構件運輸、堆放時墊放不平整，長時間放置，導致變形、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）預埋螺栓位置不正，安裝時沒有復測、沒有校正，導致柱、梁變形、扭曲，鋼架整體垂直度、平面彎曲超差。

　　(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）梁柱端板孔位不對應、錯位，安裝時端板沒有對正，螺栓緊固時沒有按順序緊固。

　　(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）現場焊接時沒有按焊接規程操作或焊工技術問題，導致焊縫不飽滿或有氣泡、夾渣、微裂縫。

　　(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）安裝時沒有詳細、認真領會圖紙，導致個別構件位置錯誤。

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

　　（6）安裝前沒有按工程實際情況制訂詳細施工方案、進行技術交底，導致工序顛倒等現像。

　　(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）施工不按順序進行，鋼架沒有形成穩定結構進行下道工序施工，導致整體失穩。

　　(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）鋼柱剛接插入式柱基時，混凝土達不到強度或柱腳固定不牢，進行上部構件安裝，導致結構失穩。

　　(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.

　　以上是濟南輕型鋼結構對常見質量事故及原因分析，想要了解更多相關內容請繼續關注我們的http://m.gitli.cn網站。

　　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://m.gitli.cn Website.