2022-02-28The laying of power cables is a continuous project that requires the cooperation of many aspects and involves a very wide range. If any of the links and steps are not done well, if they are not well considered, and if they are not well prepared, various problems will occur. , the construction will not proceed smoothly, so it is very important to do the preparatory work for cable laying. Min's Cable will tell you what preparations are needed.
1. Path retest
Path re-measurement is to find out the position of the cable path according to the engineering design drawings, and add marking piles to key parts (such as turning points, obstacles, etc.) on the cable path. When passing through the obstacles, a construction plan should be proposed. The contents include the path geology, landform, soil type, water accumulation time, dry and wet change laws, and the location of underground facilities, etc., and then determine the construction time and method. For larger projects, the location of materials and the temporary residence of employees should also be It is determined together when the route is re-measured. The re-measurement items include three main contents: alignment, distance measurement and drawing of the route map. The drawn cable route map should include the geology, landform, and the interaction between the control point and the fixed target near the route. Location, turning angle, protection method when crossing complex terrain, location and method of anti-corrosion measures, the total length of the line, etc.
2. Determine the construction method
Before construction, the person in charge of the project should be good at brainstorming, organize construction personnel or technical backbones to conduct on-site analysis, and formulate a complete construction plan, technical measures and safety measures. Check whether the design materials are correct and whether there are any omissions in the project budget, so as to apply in time Additional materials or budget. According to the size of the cable section, the manufacturing length of the entire cable, whether the laying path is bent, and the situation of crossing the underground pipeline, etc., the cable laying method is determined.
3. Check materials and tools
Check whether the necessary tools for various materials and various materials required for cable laying are complete, and whether the material quality is qualified, mainly in the following aspects.
(1) Dissecting the cable. Check whether the specification, model, voltage, cross-sectional area, number of cores, sheath structure, length, etc. of the cable meet the design requirements; whether the cable is damp; if necessary, conduct insulation resistance and DC withstand voltage tests, and do Good autopsy record.
(2) Whether the pre-embedded pipes crossing railways, highways and other pipelines are ready, and whether the pipe materials, pipe diameters and lengths are qualified.
(3) Whether the cable protection cover, cable joint protection shell, sand and brick for cable protection are sufficient and the quality is qualified.
(4) Whether the accessories, materials, tools, etc. for making the three ends of the cable are complete, and whether the quality is qualified.
(5) Check whether the tools and equipment required for each process of cable laying are ready, the quantity is sufficient and easy to use.
4. Determine the location of the intermediate joint of the power cable
Due to the high failure rate of cable intermediate joints, when the fault is repaired, it is necessary to re-excavate the operation pit. Therefore, the location of the intermediate joint must be set in a location that is convenient for construction, maintenance and does not affect traffic. The person in charge of construction should understand each cable in advance. The required length of the cable shall be calculated according to the re-measurement and the specified reserved amount, and the location of the cable joint shall be reasonably arranged to ensure the convenience of construction and maintenance as much as possible.
5. Selection of power cable branch points
The construction personnel should first go to the site again according to the data provided by the re-test, investigate the driving route of the cable transport vehicle to each sub-station, choose a flat road and a location that is convenient for laying the cable reel, and then 2 days before laying, Transport the cables that have passed the inspection to each branch and keep them properly.
In addition to the preparations for laying power cables, it is also necessary to pay attention to the correct selection of safe cables is the main goal. Unqualified cables not only affect our use, but also directly affect our life safety.