救命！山东电缆桥架跨超6米就塌？两大硬核招，承重稳如泰山

　　Help! Does the cable tray in Shandong collapse when it spans over 6 meters? Two hard core moves, bearing weight as stable as Mount Tai

　　在山东，不管是厂房、写字楼、变电站，还是大型场馆装修，电缆桥架都是必不可少的“电缆管家”——负责承载密密麻麻的电缆，既要保证电缆规整，又要经得起长期承重的考验。但很多施工方和甲方都踩过同一个坑：跨度一超过6米，电缆又多又重，普通桥架直接扛不住，要么变形下垂，要么晃动不稳，严重的甚会断裂坍塌，不仅耽误施工进度，还留下极大的隐患。

　　In Shandong, whether it is factory buildings, office buildings, substations, or large-scale venue decoration, cable trays are essential "cable managers" - responsible for carrying densely packed cables, ensuring cable safety and regularity, and withstanding long-term load-bearing tests. But many construction companies and clients have stepped on the same pit: when the span exceeds 6 meters, the cables are numerous and heavy, and ordinary cable trays cannot bear it directly. Either they deform and sag, or they shake unstably, and in severe cases, they may even break and collapse, not only delaying the construction progress but also leaving great safety hazards.

　　今天就用大白话+实打实的数据，给山东的朋友唠透大跨度电缆桥架的难题解法，不管你是施工方选型、甲方验收，还是单纯了解，看完都能少走弯路，轻松搞定6米以上大跨度电缆桥架的承重难题，再也不用为“桥架顶不住”发愁。

　　Today, with plain language and practical data, I will explain to my friends in Shandong the difficult solutions for large-span cable trays. Whether you are the construction party's selection, the party A's acceptance, or simply understanding, after reading it, you can avoid detours and easily solve the load-bearing problem of large-span cable trays over 6 meters, no longer worrying about "the tray cannot withstand".

　　先跟大家说一组扎心数据：山东市面上普通钢制电缆桥架，厚度1.5mm，无任何加固措施时，跨度仅4-5米，承载能力≤30kg/m；一旦跨度超过6米，再敷设多根高压电缆（单根高压缆重量可达8-12kg/m），桥架侧板会快速变形，下垂量超过5mm，承重极限直接跌破阈值，坍塌风险飙升60%以上。这也是为什么很多工地，普通桥架刚装完没多久，就因为跨度和承重不匹配，不得不返工整改，既费钱又费力。

　　First, let me share with you a set of heart wrenching data: ordinary steel cable trays on the Shandong market, with a thickness of 1.5mm and no reinforcement measures, have a maximum safe span of only 4-5 meters and a bearing capacity of ≤ 30kg/m; Once the span exceeds 6 meters and multiple high-voltage cables are laid (with a single cable weighing up to 8-12 kg/m), the side panels of the bridge will rapidly deform, with a sagging amount exceeding 5mm. The load-bearing limit will directly fall below the safety threshold, and the risk of collapse will soar by more than 60%. This is also why many construction sites have to rework and rectify ordinary bridge frames shortly after installation due to mismatched span and load-bearing capacity, which is both costly and laborious.

　　其实不用慌，针对山东电缆桥架6米以上大跨度、高承重的痛点，不用换昂贵的特种桥架，掌握这两招，就能轻松破解，适配不同场景需求，既省钱又靠谱，还能确保长期稳定运行。

　　In fact, there is no need to panic. For the pain points of Shandong cable trays with large spans and high load-bearing capacity of more than 6 meters, there is no need to replace expensive special trays. By mastering these two tricks, it is easy to solve them and adapt to different scene needs. It is not only cost-effective and reliable, but also ensures long-term safe and stable operation.

　　招：桥架本体加加强筋，适配6-8米跨度、中低承重场景，性价比拉满。这是常用、易落地的解法，核心就是通过增加加强筋，提升桥架本体的抗弯强度和承重能力，原理很简单，就像给桥架“加肋骨”，让它更结实耐造。

　　First move: Strengthen the reinforcement of the bridge body, suitable for 6-8 meter spans and medium to low load-bearing scenarios, with full cost-effectiveness. This is the most commonly used and easy to implement solution, the core of which is to increase the bending strength and load-bearing capacity of the bridge body by adding reinforcing ribs. The principle is simple, just like adding ribs to the bridge to make it more sturdy and durable.

　　具体操作有明确的标准，半点不能含糊：在桥架的侧板和底部，按1.5-2米的间距，焊接横向和纵向加强筋，加强筋的材质要和桥架本体一致（钢制桥架用热轧钢板，玻璃钢桥架用同材质玻纤板），厚度要比桥架本体厚0.5-1mm——比如普通1.5mm厚的钢制桥架，加强筋就用2.0-2.5mm厚的钢板。数据显示，加装加强筋后，桥架的抗弯强度可提升40%，承载能力直接翻倍，从≤30kg/m提升≤50kg/m，跨度6-8米时，下垂量可控制在2mm以内，完全符合山东建筑电气施工规范要求。

　　There are clear standards for the specific operation, and no ambiguity is allowed: on the side and bottom of the bridge, transverse and longitudinal reinforcement bars are welded at a spacing of 1.5-2 meters. The material of the reinforcement bars should be consistent with the bridge body (hot-rolled steel plates are used for steel bridge frames, and fiberglass plates of the same material are used for fiberglass bridge frames), and the thickness should be 0.5-1mm thicker than the bridge body - for example, for ordinary 1.5mm thick steel bridge frames, 2.0-2.5mm thick steel plates are used for reinforcement bars. The data shows that after installing reinforcing bars, the bending strength of the bridge can be increased by 40%, and the bearing capacity can be doubled directly, from ≤ 30kg/m to ≤ 50kg/m. When the span is 6-8 meters, the sag can be controlled within 2mm, which fully meets the requirements of Shandong Building Electrical Construction Code.

　　这里要提醒山东的施工朋友，加强筋的焊接不能敷衍，必须满焊，焊接处无夹渣、无气孔，否则会形同虚设，后期依然会出现变形问题。而且加强筋的布局要合理，横向和纵向相互配合，侧板加强筋高度不低于桥架高度的1/2，底部加强筋宽度与桥架底部一致，这样才能化分散承重压力。

　　Here, we would like to remind construction friends in Shandong that the welding of reinforcing bars cannot be perfunctory, and must be fully welded with no slag or air holes at the welding point. Otherwise, it will be meaningless and deformation problems will still occur in the later stage. And the layout of reinforcing bars should be reasonable, with horizontal and vertical coordination. The height of the reinforcing bars on the side panels should not be less than half of the height of the bridge, and the width of the reinforcing bars at the bottom should be consistent with the bottom of the bridge, in order to maximize the dispersion of load-bearing pressure.

　　第二招：加中间支撑，适配超8米跨度、大承载场景，比如敷设高压缆、密集电缆的厂房、变电站。如果跨度超过8米，哪怕加装了加强筋，桥架也很难长期承受大重量，这时候就需要在中间加支撑，相当于给桥架“搭支架”，进一步分散承重，确保稳如泰山。

　　Second move: Add intermediate support to adapt to scenarios with spans exceeding 8 meters and large load-bearing capacity, such as factories and substations where high-voltage cables and dense cables are laid. If the span is more than 8 meters, even if stiffeners are added, the bridge is difficult to bear heavy weight for a long time. At this time, it is necessary to add support in the middle, which is equivalent to "erecting supports" for the bridge to further spread the load and ensure stability.

　　具体做法也很明确：在桥架跨度的1/3处，设立柱或吊架，支撑点必须牢牢固定在建筑主体结构上（比如楼板、梁、柱），不能固定在非承重墙体上，否则支撑不稳，反而会增加隐患。比如12米跨度的桥架，就在4米和8米处各加一个中间支撑，每个支撑点的承重能力≥80kg，可有效将桥架的单段跨度缩短4米以内，承重能力提升≤100kg/m，完全适配高压缆敷设场景（单根高压缆8-12kg/m，密集敷设时每米重量可达60-80kg）。

　　The specific method is also very clear: at 1/3 of the span of the bridge, columns or hangers must be installed, and the support points must be firmly fixed to the main structure of the building (such as floor slabs, beams, columns), and cannot be fixed to non load bearing walls, otherwise the support will be unstable and increase safety hazards. For example, for a bridge with a span of 12 meters, an intermediate support is added at 4 meters and 8 meters respectively. The load-bearing capacity of each support point is ≥ 80kg, which can effectively shorten the single span of the bridge to less than 4 meters and increase the load-bearing capacity to ≤ 100kg/m. It is fully suitable for high-voltage cable laying scenarios (single high-voltage cable 8-12kg/m, weight per meter can reach 60-80kg when densely laid).

　　补充一组实用数据，方便山东朋友选型参考：钢制桥架加装加强筋后，每米成本仅增加15-25元，相比更换特种桥架，可节省30%-40%的成本；中间支撑的立柱采用80*80mm方钢，厚度2.0mm，吊架采用Φ12mm镀锌螺杆，防腐防锈，适配山东潮湿、多粉尘的工业环境，使用寿命可达15年以上，后期维护成本极低。

　　Add a set of practical data for Shandong friends to refer to for selection: After installing reinforcing bars on steel cable trays, the cost per meter only increases by 15-25 yuan, which can save 30% -40% of the cost compared to replacing special cable trays; The column supported in the middle is made of 80 * 80mm square steel with a thickness of 2.0mm. The hanger is made of Φ 12mm galvanized screw, which is corrosion-resistant and rust proof. It is suitable for the humid and dusty industrial environment in Shandong, with a service life of more than 15 years and extremely low maintenance costs in the later stage.

　　很多山东施工方反馈，不知道该怎么选择两种方案，其实很简单：跨度6-8米、电缆敷设密度不高（每米重量≤50kg），选种“加加强筋”即可，性价比；跨度超8米、敷设高压缆或密集电缆（每米重量＞50kg），选第二种“加中间支撑”，必要时可两种方案结合使用，双重保障承重。

　　Many construction companies in Shandong have given feedback that they do not know how to choose between two options. In fact, it is very simple: for spans of 6-8 meters and low cable laying density (weight per meter ≤ 50kg), the first option of "reinforcing bars" can be chosen, which has the highest cost-effectiveness; If the span exceeds 8 meters and high-voltage cables or dense cables (with a weight of more than 50kg per meter) are laid, the second option of "adding intermediate support" can be selected. If necessary, the two options can be combined to ensure double load-bearing safety.

　　总结来说，山东电缆桥架遇到6米以上大跨度、电缆又多又重的难题，不用慌，记住这两招：6-8米跨度用“加强筋加固”，超8米大承载用“中间支撑”，结合精准的材质和尺寸标准，既能保证桥架承重稳如泰山，又能节省成本、避免返工。对山东的施工方和甲方来说，选对大跨度解决方案，不仅能确保施工，还能提升工程质量，减少后期维护麻烦，这就是山东电缆桥架大跨度难题的核心解法，实用又好落地。

　　To sum up, when Shandong cable bridge encounters the problem of large span of more than 6 meters and numerous and heavy cables, don't panic. Remember these two measures: 6-8 meters of span is reinforced with "stiffeners", and the super 8 meters of large bearing capacity is supported with "intermediate support". Combining accurate materials and size standards, it can not only ensure the stability of the bridge frame bearing, but also save costs and avoid rework. For the construction party and party A in Shandong, choosing the right large-span solution can not only ensure construction safety, but also improve project quality and reduce maintenance troubles in the later stage. This is the core solution to the large-span problem of Shandong cable trays, which is practical and easy to implement.