What we call power transmission can be divided into two main parts: transmission lines and substations. Transmission lines are: steel tower, steel pipe pole, concrete pole, power cable, etc., the tower of the line transmission form is more common. With the improvement of the domestic transmission line construction planning level, more use of high-voltage power cable underground buried laying method. Buried power transmission lines in the cablepipe blockingThe main areas of protection are: the plugging of cable tunnels in underground artificial wells, the plugging of cable tunnels in underground transmission lines in substations, and the opening of cable ducts in the walls of substation buildings.

　　一. Safety hazards of poorly handled underground cable duct blocking program for power transmission and transformation

　　1. Improper sealing of underground cable and pipe joints, resulting in seepage of surrounding groundwater and domestic sewage into the pipes through the underground joints; unplugged cable pipes will become drainage outlets, and cables and pipes at lower locations may become completely submerged in water.

  2. high ground around the artificial well or sudden heavy rain, surface water flows back into the artificial well and flows into the next artificial well through the unplugged orifice in the well. The cables and pipes in the lower location may be completely submerged in water, posing a potential hazard to line operation.

  3. Due to the accumulation of water and sedimentation in unplugged cable vaults, a significant amount of time is required for water pumping and pipe unblocking prior to later maintenance of the cable vaults.

  4. Unplugged cable ducts can become a conduit for small animals such as rats, snakes and scorpions. Small animals biting on the cables can cause hidden dangers in line operation.

　　Underground cables for power transmission and transformation projectspipe blockingrealize

　　At present, in the construction of buried transmission lines, there are still some projects using cement, plugging king, fireproof mud and other materials for pipeline segmental plugging. The disadvantage of these organic/inorganic plugging materials is that they have a short service life and are prone to cracking due to thermal expansion and contraction and lose their plugging and waterproofing effect. When connecting cables for maintenance and other operations, the cable ducts have been fixed and blocked, and excavation operations are prone to damage to the pipelines and cables, greatly reducing the effectiveness of traditional plugging materials and leaving hidden dangers for future cable expansion. Therefore, it is necessary to adopt more advanced technology and products to solve the problems of waterproofing, blocking silt and invasion of harmful gases in underground cable pipes. Inflatable cable pipe blocking airbag is a new type of sealing products developed on the basis of solving the drawbacks of traditional materials. At present, it has become a standardized sealing product in the planning and construction of electric power and communication in Europe and the United States.