35kv及以下电缆敷设.wps（35kV and below cable laying,.Wps）.docVIP

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35kv及以下电缆敷设.wps（35kV and below cable laying,.Wps）.doc

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35kv及以下电缆敷设.wps（35kV and below cable laying,.Wps）

35kv及以下电缆敷设.wps（35kV and below cable laying,.Wps） A lot of the laying of power cable laying, generally in the channel, tunnel, bracket, shaft, through the pipeline, directly buried underground and laying in the bottom. Exactly what kind of way of laying, according to the economic, fire safety, convenient construction and maintenance of the principle, and combined with the specific situation of building structure. In fact, a cable line often need to adopt ways to lay. Preparation and general requirements, before laying cable 1. preparation for cable laying Cable laying, cable line through the building structure, construction should be completed. We should check the bending radius of cable trench and tunnel construction part turning meets the requirement. Check the cable type, specification and quantity and design drawings. In order to reduce the error, easy installation, the cable bracket, the channel tunnel, the shaft of the import and export, turning and appropriate parts should be hung on the cross section of the cable laying diagram. The low winter temperatures, the oil impregnated paper insulated cable internal viscosity, lubrication is reduced, so that the cable hard plastic cable at low temperature will become hard. This cable is hard and not easy to bend, laying, cable insulation paper or plastic insulation easily damaged, so the construction in winter, if the cable location in before laying the average temperature of the 24h and the laying site temperature is lower than the values of table 2-1 provisions, measures should be taken to preheat the cable laying. There are two methods of cable and preheating is a method to improve the ambient air temperature, will be placed in a heated indoor cable (or a fire furnace tent), the indoor temperature to improve the heating cable. This method requires a longer time, the indoor temperature is 5 to 10 DEG C, 72h, the indoor temperature is 25 degrees centigrade to 24 ~ 36h. Another method is the current heating method, c