在電氣工程的隱蔽工程中，電纜橋架如同電力的 “血管支架”，其質量直接影響電纜壽命與系統。但少數不良廠商會在材料厚度、加工工藝、配件質量上 “動手腳”，導致橋架承重不足、防腐失效甚引發短路風險。掌握一套細致的檢查方法，就能像給橋架做 “全身體檢”，讓偷工減料的貓膩無處遁形。

　　In the concealed engineering of electrical engineering, cable trays are like the "vascular supports" of electricity, and their quality directly affects the service life of cables and system safety. However, a small number of unscrupulous manufacturers may take risks in terms of material thickness, processing technology, and accessory quality, resulting in insufficient load-bearing capacity, corrosion resistance failure, and even short circuit risk of the bridge. Mastering a detailed set of inspection methods can be like giving a "full body examination" to a bridge frame, making the tricks of cutting corners nowhere to hide.

　　一、外觀 “望診”：細節里藏著 “誠實度”

　　1、 Appearance "inspection": "Honesty" hidden in details

　　用肉眼觀察橋架的 “外在品相”。合格橋架表面應平整光滑，熱鍍鋅層均勻無漏鍍（鋅層厚度≥65μm），噴涂橋架的涂層厚度≥60μm，用指甲輕劃無脫落；若發現局部泛白、銹點或涂層厚薄不均，可能是表面處理工序縮水。其次查看焊接或拼接處：焊點應連續飽滿（焊縫高度≥3mm），無虛焊、漏焊（用手電筒側照可發現縫隙），螺栓連接孔邊緣無毛刺（毛刺會劃傷電纜絕緣層），且孔徑與螺栓規格匹配（如 M6 螺栓對應孔徑 6.5-7mm，過大可能偷工導致連接松動）。正規橋架的出廠標識應清晰標注執行標準（如 /T 10216）、材質型號（如 Q235B）、板材厚度等信息，若標識模糊或缺失關鍵參數，需提高警惕。

　　Firstly, observe the "external appearance" of the bridge with the naked eye. The qualified bridge surface should be flat and smooth, with a uniform hot-dip galvanized layer and no missing plating (zinc layer thickness ≥ 65 μ m). The coating thickness of the sprayed bridge should be ≥ 60 μ m, and there should be no peeling when lightly scratched with a fingernail; If local whitening, rust spots, or uneven coating thickness are found, it may be due to shrinkage in the surface treatment process. Next, check the welding or splicing points: the welding points should be continuous and full (weld height ≥ 3mm), without virtual welding or missing welding (gaps can be found by side illumination with a flashlight), the edges of the bolt connection holes should be free of burrs (burrs can scratch the cable insulation layer), and the hole diameter should match the bolt specifications (such as M6 bolts corresponding to a hole diameter of 6.5-7mm, which may cause loose connections due to theft). The factory labeling of regular cable trays should clearly indicate the implementation standards (such as /T 10216), material models (such as Q235B), plate thickness, and other information. If the labeling is unclear or key parameters are missing, vigilance should be heightened.

　　二、尺寸 “量診”：毫米級的 “質量分水嶺”

　　2、 Size "measurement diagnosis": millimeter level "quality watershed"

　　用游標卡尺（精度 0.02mm）測量板材厚度是核心環節：標準要求，橋架寬度＜200mm 時，底板厚度≥1.2mm；200-400mm 時≥1.5mm；400-800mm 時≥2.0mm；800mm 以上≥2.5mm。尤其要測量托盤式橋架的底板中部（易偷薄區域），槽式橋架的側板折彎處（折彎可能導致實際厚度減薄）。檢查配件尺寸：連接片厚度應與橋架主體一致（如主體 2.0mm 則連接片不低于 1.8mm），支撐件的橫檔直徑（如圓鋼支撐）需≥8mm，托架間距≤1.5m（過大致使承重能力下降）。用鋼卷尺測量橋架長度、寬度、高度，誤差應≤±2mm，若實測值比標稱值小 5mm 以上，可能是模具老化或偷工導致尺寸縮水。

　　Measuring the thickness of the board with a vernier caliper (accuracy 0.02mm) is the core step: according to national standards, when the width of the bridge is less than 200mm, the thickness of the bottom plate should be ≥ 1.2mm; when the width is between 200-400mm, it should be ≥ 1.5mm; when the width is between 400-800mm, it should be ≥ 2.0mm; and when the thickness is above 800mm, it should be ≥ 2.5mm. Especially, it is necessary to measure the middle of the bottom plate of the tray type bridge (the area prone to thinning) and the bending of the side plate of the trough type bridge (bending. Check the dimensions of the accessories: the thickness of the connecting piece should be consistent with the main body of the bridge (if the main body is 2.0mm, the connecting piece should not be less than 1.8mm), the diameter of the crossbar of the support (such as round steel support) should be ≥ 8mm, and the spacing between the brackets should be ≤ 1.5m (too rough will reduce the load-bearing capacity). Measure the length, width, and height of the bridge with a steel tape measure, with an error of ≤± 2mm. If the measured value is more than 5mm smaller than the nominal value, it may be due to mold aging or theft causing size shrinkage.

　　三、材料 “問診”：識破 “以次充好” 的把戲

　　3、 Material "Consultation": Identifying the Trick of "Passing Off Poor Quality as Good"

　　通過 “一看二試三查” 判斷材質真偽。“看” 顏色：熱鍍鋅橋架應為銀灰色，表面無明顯黑斑（黑斑可能是鋅液雜質或鍍層過薄）；鋁合金橋架呈銀白色，氧化膜均勻（厚度≥10μm），若表面發暗或有斑點，可能是回收鋁加工。“試” 物理特性：用磁鐵吸附，Q235B 鋼材橋架應被吸附，若完全不吸可能是劣質不銹鋼或鋁合金（需結合設計要求判斷）；用硬度計測試（如巴氏硬度），鋁合金橋架硬度應≥45HB，過低可能是鋁含量不足。“查” 證明文件：要求提供材質檢測報告（含屈服強度、拉伸強度數據，如 Q235B 鋼材屈服強度≥235MPa）、鍍鋅層附著力測試報告（劃格法檢測，涂層無脫落），防火橋架需額外提供耐火極限檢測（如耐火時間≥30 分鐘），若廠商無法提供或數據異常，材質大概率存疑。

　　Determine the authenticity of the material through "one look, two tests, and three checks". Color "Look": The hot-dip galvanized bridge should be silver gray with no obvious black spots on the surface (black spots may be impurities in the zinc solution or a thin coating); The aluminum alloy bridge has a silver white color and a uniform oxide film (thickness ≥ 10 μ m). If the surface appears dark or has spots, it may be due to recycled aluminum processing. Physical characteristics of "test": Q235B steel bridge should be adsorbed by a magnet. If it does not absorb at all, it may be inferior stainless steel or aluminum alloy (to be judged based on design requirements); Using a hardness tester (such as Babbitt hardness), the hardness of the aluminum alloy bridge should be ≥ 45HB. If it is too low, it may be due to insufficient aluminum content. Proof documents for inspection: Material testing report (including yield strength and tensile strength data, such as Q235B steel yield strength ≥ 235MPa), galvanized layer adhesion testing report (grid method testing, no coating peeling) are required. Fire resistant bridge frames need to provide additional fire resistance limit testing (such as fire resistance time ≥ 30 minutes). If the manufacturer is unable to provide or the data is abnormal, the material is likely to be in doubt.

　　四、工藝 “觸診”：手感里的 “質量密碼”

　　4、 Craft "palpation": the "quality code" in the feel

　　用手觸摸橋架邊緣，合格產品應做倒圓角處理（R 角≥2mm），無鋒利毛邊（毛邊可能割傷施工人員或電纜），若邊緣割手，可能是沖裁模具未打磨或偷省去毛刺工序。晃動連接部件，螺栓螺母應配合緊密，無松動異響，彈簧墊片需完整（缺失墊片會導致震動下螺栓脫落）。檢查接地設計：橋架之間應設置跨接線，接地孔需去除涂層確保導電良好，若跨接線過細或未做接地處理，可能導致漏電風險。

　　Touch the edge of the bridge with your hand, and qualified products should be rounded (R angle ≥ 2mm) without sharp burrs (burrs may cut construction personnel or cables). If the edge is cut by hand, it may be due to the punching mold not being polished or the burr process being omitted. Shake the connecting components, the bolts and nuts should fit tightly without any looseness or abnormal noise, and the spring washers should be intact (missing washers can cause the bolts to fall off under vibration). Check the grounding design: jumper wires should be installed between cable trays, and the coating on the grounding holes should be removed to ensure good conductivity. If the jumper wires are too thin or not grounded, it may lead to leakage risk.

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