很多项目桥架装完，表面看横平竖直，一交底就露怯。验收不是拿手电筒照一遍漆面，抓不住关键节点，后期电缆放进去才出问题。

Many projects have completed the installation of cable trays, which appear to be horizontal and vertical on the surface, but when they are first disclosed, they become timid. Acceptance is not about shining a flashlight on the paint surface once, failing to grasp key nodes, and only encountering problems when cables are inserted later.

先看支吊架，不先看桥架本体。支架间距水平段一般1.5到2米，垂直段不大于2米；大跨距建议按厂家允许跨距施工，严禁私自拉长。支架要固定在承重梁、楼板，不能挂在风管水管上。托臂臂长选小了，桥架外沿悬空，走人检修就会颤。

First look at the supports and hangers, not the bridge body. The spacing between brackets is generally 1.5 to 2 meters for horizontal sections and no more than 2 meters for vertical sections; Large spans must be constructed according to the manufacturer's allowed spans, and unauthorized elongation is strictly prohibited. The bracket should be fixed on the load-bearing beam and floor slab, and cannot be hung on the air duct and water pipe. If the length of the supporting arm is chosen too small, the outer edge of the bridge will be suspended, and it will tremble when walking for maintenance.

第二看连接和接地。金属桥架全长至少两处接接地干线。非镀锌桥架连接板两端要跨接不小于4平方铜软线；镀锌桥架用带防松垫圈螺栓紧固，可不做跨接，但电气连通建议连续。别用铁丝替铜线，也别把螺母朝里装——螺杆尖头朝内，放电缆时就是一把锉刀。

The second consideration is the connection and grounding. The metal bridge shall have at least two grounding main lines along its entire length. Both ends of the non galvanized bridge connecting plate should be bridged with a copper flexible wire of no less than 4 square meters; Galvanized cable trays are fastened with bolts with anti loosening washers, and cross connections are not required, but electrical connections must be continuous. Do not use iron wire instead of copper wire, and do not install the nut facing inward - the tip of the screw is facing inward, which is like a file when placing the cable.

第三看伸缩和变形缝。钢制直线超30米、铝合或玻璃钢超15米，要设伸缩节；过沉降缝建议装补偿装置，留20到50毫米余量。济南冬夏温差大，不装伸缩节，热胀冷缩能把接头螺栓顶松。

Thirdly, look at the expansion and deformation joints. Steel straight lines exceeding 30 meters, aluminum or fiberglass exceeding 15 meters, expansion joints must be installed; Compensation devices must be installed for settlement joints, leaving a margin of 20 to 50 millimeters. Jinan has a large temperature difference between winter and summer, so no expansion joint is installed. Thermal expansion and contraction can loosen the joint bolts.

第四看填充率和弯通。动力电缆填充率不超40%，控制电缆不超50%。弯头弯曲半径要大于电缆允许弯曲半径，动力缆通常按外径10倍以上留。现场拿角磨机随便切个直角，电缆硬折进去，绝缘层层伤。

The fourth factor is the filling rate and curvature. The filling rate of power cables shall not exceed 40%, and the filling rate of control cables shall not exceed 50%. The bending radius of the elbow should be greater than the allowable bending radius of the cable, and power cables are usually kept at least 10 times the outer diameter. On site, use an angle grinder to randomly cut a right angle, and the cable is forcefully folded in, causing damage to the insulation layers.

非常后看防火封堵。穿墙穿楼板建议用防火包、防火泥、防火板堵实，厚度匹配墙体耐火出色。只把桥架戳过洞，火情时烟和火顺着线槽跑，分区隔离等于失效。

Finally, let's take a look at the fireproof sealing. Penetrating through walls and floors must be filled with fireproof bags, fireproof mud, and fireproof boards, with a thickness that matches the fire resistance limit of the wall. Only poke the bridge through the hole, and in case of a fire, smoke and fire will run along the cable tray. Partition isolation is equivalent to failure.

到货抽检也别省：卡尺测实厚，测厚仪查锌层，切口毛刺要打磨。资料核对合格证、材质报告、载荷曲线。

Don't skip the spot check upon arrival: use a caliper to measure the actual thickness, use a thickness gauge to check the zinc layer, and polish any burrs on the cut. Verify the certificate of conformity, material report, and load curve.

桥架系统“三分材质七分装”，验收单上这五项打勾，后面十年少返工。

The cable tray system is divided into three parts of material and seven parts of packaging. Check these five items on the acceptance form, and the next ten years will require rework.