刘文坤（第二炮兵后勤部营建办公室，北京市 100085）

The Impact of Mineral Insulated Cables on the Structure Offset in Extra-high Buildings

Li Binghua Xu Xuemin Wu Shengting Lin Qinglin Zhang Qiaoling（China Construction

Design International，Beijing 100013，China）

Zhu Liyang（Beijing University of Civil Engineering and Architecture，Beijing 100044，China）

Liu Wenkun（Construction Office of Logistics Department of the Second Artillery，Beijing 100085，China）

 

Abstract Mineral insulated cables are often used in extra-high buildings as fire protection trunk cable. On one hand，their insulating material，magnesium oxide，however，easily absorbs moisture，resulting in rapid drop in insulation resistance. On the other hand，their intermediate connectors and terminals of cables are chronically in a vibrational state due to the fact that extra-high buildings，usually made of steel structures，are subject to a certain degree of offset in the wind，which has an impact on the reliability of the cables. Therefore，the waterproof and moisture-resistance capabilities of mineral insulated cables subject to vibrating conditions are studied by means of simulation tests and theoretical analyses，which form the basis for the correct selection of mineral insulated cables.

Key words　Extra-high building Mineral insulated cable Intermediate connector of cable Cable terminal Offset Moisture absorption

 

 

摘　要　超高层建筑中消防配电干线通常采用矿物绝缘电缆，这种电缆的绝缘材料为氧化镁，氧化镁很容易吸潮，受潮后绝缘电阻迅速降低。而超高层建筑通常采用钢结构，在风的作用下存在一定的偏移，使矿物绝缘电缆的中间联接器（简称“联接器”）和电缆端头长期处于振动状态下，对其可靠性有一定的影响。通过模拟试验和理论分析研究矿物绝缘电缆振动后中间联接器和端头的防水防潮性能，为正确选用矿物绝缘电缆提供依据。

关键词　超高层建筑　矿物绝缘电缆　电缆中间联接器　电缆端头　偏移量　吸潮