1. When the cable tray is laid in the technical layer where various professional pipelines are concentrated and in the suspended ceiling above the corridor, the distance between the tray and the water supply pipe and air pipe cannot meet the requirements of the specification. When maintenance is needed, it is not convenient to open the cover plate of the tray. In the process of installation, it is very difficult to control the pipeline if we do not cooperate with the relevant professional and the technical data of the professional pipeline in advance. As for this work, can we draw a brief drawing in advance, including the technical data of comprehensive pipeline, the position of the bridge and the sectional drawing of the dimensions among each other, so as to reasonably adjust the distance between professional pipelines and prevent the occurrence of common diseases?
2. The filling rate of cables in the bridge exceeds the standard value. In construction drawings, the most common is the plane layout, even if there is a section drawing is not very perfect, according to the "steel cable bridge engineering design specifications" article 3.8.1 provisions: its design content :1. 2. Relevant sections of the bridge system; A detailed list of the specifications and quantities of pallets required for the bridge frame system, straight section bending of ladder frame, and supports and hangers, as well as necessary instructions; Non-standard technical specifications or visuals with special requirements. Due to imperfect design and other reasons, too many cables are placed locally, or even full load, which does not meet the requirements of article 3.2.1 of the code: the filling rate of cables should not exceed the specified value of relevant standards, 40% of power cables, and 50% of control cables. , for that matter, supervisors should prepare beforehand control counter measures, strict construction units before not purchasing bridge, skilled in the use function of electrical engineering system, for each number of cable and cable bridge frame make accurate statistics, found that the problem should be in conjunction with the design change of the specifications of the bridge in time, effectively control the occurrence of quality problems.
3. The cables laid in the cable tray are not fixed or marked: according to code 12.2.2, when the cables are laid vertically, they are fixed every 1 -- 1.5m; when laid horizontally, the ends of the cables, turns and straight sections are fixed every 5 -- 10m; Article 13.2.4 of the code: the first end, end, turn and branch of the cable shall be marked (cable number, model and specification), etc.