1、安装前先核对：支撑间距和桥架间距有硬性要求

1. Before installation, check that there are strict requirements for support spacing and bridge spacing

根据GB 50303《建筑电气工程施工质量验收规范》，铝合金桥架水平敷设时，支撑点间距不应大于1.5米；垂直敷设时不应大于2米。桥架与桥架之间的拼接缝隙，标准要求控制在3毫米以内，超出这个范围需要加垫片处理。武汉铝合金桥架在实际项目中，不少施工队为了赶工期跳过垫片这一步，导致后期桥架晃动、连接处开裂，返工成本反而更高。

According to GB 50303 "Code for Acceptance of Construction Quality of Electrical Engineering in Buildings", when laying aluminum alloy cable trays horizontally, the spacing between support points should not exceed 1.5 meters; When laid vertically, it should not exceed 2 meters. The splicing gap between cable trays is required to be controlled within 3 millimeters according to the standard, and gaskets need to be added if it exceeds this range. In actual projects, many construction teams in Wuhan skipped the step of gasket in order to meet the deadline, resulting in later shaking of the bridge and cracking of the connection, and the cost of rework is actually higher.

2、接地不是拧颗螺丝那么简单

2. Grounding is not as simple as screwing a screw

铝合金桥架本身导电性不如钢制桥架，所以接地环节更不能马虎。国标要求桥架全长应与接地干线可靠连接，连接点间距不超过30米，转弯处和端部均需设置接地点。实际操作中常见的问题是只在起点和终点各接一处，中间大段桥架处于"浮空"状态，一旦发生漏电，电流无法及时导入大地，风险不小。建议使用专用接地跨接线，截面积不小于4平方毫米，连接处需去除氧化层后再紧固。

Aluminum alloy cable trays themselves have lower conductivity than steel cable trays, so the grounding process cannot be taken lightly. The national standard requires that the entire length of the bridge should be reliably connected to the grounding main line, with a distance of no more than 30 meters between connection points. Grounding points should be set at both the turning and end points. A common problem in practical operation is that only one point is connected at the starting and ending points, and the middle section of the bridge is in a "floating" state. Once leakage occurs, the current cannot be timely introduced into the ground, and the risk is not small. It is recommended to use a dedicated grounding jumper wire with a cross-sectional area of not less than 4 square millimeters. The connection should be removed of the oxide layer before tightening.

3、穿墙和楼板处的封堵，很多项目栽在这里

3. The sealing of through walls and floor slabs is where many projects are located

桥架穿越防火分区的墙体或楼板时，需要做防火封堵。封堵材料应选用防火包或防火泥，填塞后表面需与墙体齐平。2026年新修订的消防验收细则中，对封堵材料的耐火出色有了更明确的要求，普通水泥砂浆已不能满足部分场景的验收标准。武汉铝合金桥架在武钢、三峡水电等大型项目中，封堵工序都有专人逐点位检查，这个经验值得中小项目借鉴。

When the bridge passes through the walls or floors of the fire compartment, fireproof sealing is required. The sealing material should be fireproof bags or fireproof mud, and the surface after filling should be flush with the wall. In the newly revised fire safety acceptance rules for 2026, there are clearer requirements for the fire resistance limit of sealing materials, and ordinary cement mortar can no longer meet the acceptance standards for some scenarios. In large-scale projects such as Wuhan Iron and Steel Group and Three Gorges Hydropower, the sealing process of Wuhan aluminum alloy cable trays is inspected point by point by dedicated personnel. This experience is worth learning from for small and medium-sized projects.

铝合金桥架的安装质量，七分靠规范、三分靠细节。支撑间距、接地跨接、防火封堵这三个环节环环相扣，明显一处缩水都可能在验收或后续运行中暴露出来。武汉铝合金桥架用户在施工管理中，把这三项作为必检项固定下来，项目交付会顺畅很多。

The installation quality of aluminum alloy cable trays depends on specifications in seven parts and details in three parts. The three links of support spacing, grounding cross connection, and fire sealing are interrelated, and any shrinkage at any point may be exposed during acceptance or subsequent operation. Wuhan aluminum alloy bridge users fix these three items as mandatory inspection items in construction management, and project delivery will be much smoother.

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