山东电缆桥架验收别大意！7大关键注意事项，筑牢用电防线

　　Don't be careless about the acceptance of Shandong cable tray! 7 key precautions to strengthen the defense line of electrical safety

　　做工程的兄弟都清楚，电缆桥架验收是保障后期用电的关键环节，绝非“随便看看外观、检查下固定”那么简单。一旦验收环节遗漏要点，很可能留下导电不良、承重不足、火灾隐患等问题，后期返工不仅费钱费力，还可能影响整个工程的交付进度。今天就把电缆桥架验收的7大核心注意事项讲透，都是实操中总结的干货，收藏好对照着查，确保验收一步到位不踩坑。

　　Engineering brothers all know that cable tray acceptance is a key link in ensuring electrical safety in the later stage, and it is not as simple as "just looking at the appearance and checking the fixation". Once the key points are missed in the acceptance process, it is likely to leave safety issues such as poor conductivity, insufficient load-bearing capacity, and fire hazards. Rework in the later stage not only costs money and effort, but may also affect the delivery schedule of the entire project. Today, we will explain the 7 core precautions for cable tray acceptance, which are all practical summaries. Collect and compare them to ensure that the acceptance is completed in one step without any pitfalls.

　　要关注的是桥架连接处的跨接线安装，这是保障导电连续性的核心要求。很多工程验收时容易忽略跨接线的规格，规范明确要求，连接处必须安装截面积≥4mm?的跨接线。别小看这根线，它能确保整个桥架形成完整的导电回路，避免因接触不良产生电火花，从根源减少隐患。验收时一定要逐一检查，确认跨接线安装牢固、规格达标，不能有遗漏或偷工减料的情况。

　　The first thing to focus on is the installation of jumper wires at the bridge connection, which is the core requirement for ensuring conductivity continuity. During the acceptance of many projects, it is easy to overlook the specifications of jumper wires. The specifications clearly require that jumper wires with a cross-sectional area of ≥ 4mm must be installed at the connection. Don't underestimate this wire, it can ensure that the entire bridge forms a complete conductive circuit, avoid electric sparks caused by poor contact, and reduce safety hazards from the root. During acceptance inspection, it is necessary to check one by one to confirm that the jumper wires are firmly installed and meet the specifications, and there should be no omissions or cutting corners.

　　其次是桥架与支架、横担的连接牢固性。桥架的稳定性全靠支架支撑，验收时要检查所有连接部位是否采用螺栓固定，拧紧程度是否到位，用手晃动桥架和支架，不能有松动、晃动的情况。有些施工队为了图省事，会用焊接代替螺栓固定，这种做法不符合规范，后续一旦出现腐蚀或震动，很容易导致桥架脱落，必须坚决杜绝。

　　Next is the firmness of the connection between the bridge frame, bracket, and cross arm. The stability of the bridge frame relies entirely on the support of the brackets. During acceptance, it is necessary to check whether all connecting parts are fixed with bolts and whether the tightening degree is in place. The bridge frame and brackets should be shaken by hand without any looseness or shaking. Some construction teams, in order to save time, use welding instead of bolts for fixing. This practice does not comply with regulations, and once corrosion or vibration occurs in the future, it is easy to cause the bridge to fall off, which must be resolutely eliminated.

　　第三点是伸缩节和补偿器的设置。电缆桥架在温度变化时会热胀冷缩，若不设置伸缩装置，长期下来容易导致桥架变形、开裂。规范要求，桥架直段安装长度超过30m时，必须设置伸缩节；如果桥架需要跨越变形缝，还得在变形缝位置额外增加补偿器，确保桥架能适应温度变化和结构沉降，始终保持稳定。验收时要核对桥架长度和伸缩节、补偿器的安装位置，确认数量和规格都符合要求。

　　The third point is the setting of expansion joints and compensators. Cable trays will experience thermal expansion and contraction during temperature changes. If no expansion device is installed, it is easy to cause deformation and cracking of the tray over time. According to regulations, when the installation length of the straight section of the bridge exceeds 30m, expansion joints must be installed; If the bridge needs to cross deformation joints, additional compensators need to be added at the position of the deformation joints to ensure that the bridge can adapt to temperature changes and structural settlement, and remain stable at all times. During acceptance, the length of the bridge frame and the installation positions of expansion joints and compensators should be checked to confirm that the quantity and specifications meet the requirements.

　　第四点要检查吊杆的直径规格。用吊杆固定桥架时，吊杆的承重能力直接关系到桥架的，规范明确要求吊杆直径不能小于8mm。验收时可以用卡尺实测吊杆直径，同时检查吊杆与顶部结构的连接是否牢固，避免因吊杆过细或固定不牢，导致桥架承重不足而下垂变形，尤其是在桥架内铺设大量电缆后，承重压力会进一步增大，更要确保吊杆达标。

　　The fourth point is to check the diameter specifications of the suspension rod. When fixing the bridge frame with a suspension rod, the load-bearing capacity of the suspension rod is directly related to the safety of the bridge frame. The specification clearly requires that the diameter of the suspension rod should not be less than 8mm. During acceptance, the diameter of the suspension rod can be measured with a caliper, and the connection between the suspension rod and the top structure can be checked for firmness to avoid insufficient load-bearing and deformation of the bridge frame due to the suspension rod being too thin or not firmly fixed. Especially after laying a large number of cables in the bridge frame, the load-bearing pressure will further increase, and it is necessary to ensure that the suspension rod meets the standard.

　　第五点是支吊架的间距控制。支吊架间距过大是验收中常见的问题，规范要求间距不能超过2m。间距过大容易导致桥架中间部位下垂，不仅影响美观，还可能压迫电缆，影响电缆的使用寿命。验收时要沿着桥架走向逐段测量，确认支吊架安装均匀，间距严格控制在2m以内，对于桥架转弯、爬坡等受力较大的部位，还可以适当缩小间距。

　　The fifth point is the spacing control of supports and hangers. Excessive spacing between supports and hangers is a common problem in acceptance testing, and the maximum spacing required by regulations should not exceed 2 meters. Excessive spacing can easily cause sagging in the middle of the bridge, which not only affects aesthetics but may also compress cables and affect their service life. During acceptance, measurements should be taken section by section along the direction of the bridge to confirm that the support and hanger installations are evenly distributed and the spacing is strictly controlled within 2 meters. For areas with high stress such as bridge bends and climbing, the spacing can be appropriately reduced.

　　第六点要关注弯头处的支架设置。桥架弯头处是受力薄弱环节，也是容易变形的部位，规范要求在弯头处以及弯头两侧600mm范围内，必须设置支架。验收时要检查弯头部位，确认支架安装到位，能有效支撑弯头重量，避免因弯头处缺乏支撑导致桥架变形，进而影响电缆的铺设和使用。

　　The sixth point is to pay attention to the bracket setting at the bend. The bend of the bridge is a weak point of stress and a prone area to deformation. According to regulations, brackets must be installed at the bend and within a range of 600mm on both sides of the bend. During acceptance inspection, it is important to focus on checking the elbow area to ensure that the bracket is installed properly and can effectively support the weight of the elbow, avoiding deformation of the cable tray due to lack of support at the elbow, which may affect the laying and use of the cable.

　　一点，也是容易被忽略的防火封堵和盖板闭合。电缆穿装完成后，必须及时盖上桥架盖板，防止灰尘进入或意外触碰电缆；更关键的是，桥架穿墙、穿楼板的洞口，必须做好防火封堵。防火封堵能有效阻止火灾时火焰通过洞口蔓延，是保障建筑防火的重要措施。验收时要检查盖板是否闭合严密，防火封堵材料是否填充饱满、符合防火等级要求，不能有缝隙或遗漏的洞口。

　　The last point, which is also easily overlooked, is the fireproof sealing and cover closure. After the cable installation is completed, the bridge cover must be promptly covered to prevent dust from entering or accidentally touching the cable; More importantly, fireproof sealing must be done for the openings of bridge frames passing through walls and floors. Fireproof sealing can effectively prevent flames from spreading through openings during a fire, and is an important measure to ensure building fire safety. During acceptance, it is necessary to check whether the cover plate is tightly closed, whether the fireproof sealing material is fully filled and meets the requirements of the fire rating, and whether there are no gaps or missing openings.

　　以上7点是电缆桥架验收的基础规范要求，每一项都直接关系到后期使用，少一项都可能导致验收不通过，甚留下隐患。验收时一定要耐心细致，逐点核对，不能抱有“差不多就行”的侥幸心理。除了这7点，实际验收中还可以结合工程的具体情况，检查桥架的防腐处理、电缆铺设的整齐度等细节。只有严格按照规范验收，才能确保电缆桥架系统稳定可靠，为后续用电筑牢防线。如果在验收过程中遇到疑问，建议及时咨询的电气工程师，避免因知识不足导致验收失误。

　　The above 7 points are the basic specification requirements for cable tray acceptance, each of which is directly related to the safety of later use. Missing one item may result in failure of acceptance or even leave safety hazards. During the acceptance process, one must be patient and meticulous, checking each point point point by point, and not have a lucky mentality of 'almost enough'. In addition to these 7 points, the actual acceptance can also be combined with the specific situation of the project to check the anti-corrosion treatment of the bridge frame, the neatness of cable laying, and other details. Only by strictly following the standards for acceptance can we ensure the stability and reliability of the cable tray system, and build a solid defense line for subsequent electrical safety. If you encounter any doubts during the acceptance process, it is recommended to consult a professional electrical engineer in a timely manner to avoid acceptance errors due to insufficient professional knowledge.

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