1) The selection of the path of the PUR underwater cable should meet the requirements of the PUR underwater cable not being susceptible to mechanical damage, being able to implement reliable protection, being convenient to lay, and being economical and reasonable, etc., and should meet the following requirements: 1. The PUR underwater cable should be laid in a stable river bed with slow water flow, on the shore It is not easy to be washed away, there are no obstacles such as rockfalls or shipwrecks on the seabed, and there are few waters where anchors sink and shipwrecks. Trawler activities are rare. 2. Cables shall not be laid near docks, ferry ports, hydraulic structures, or in dredging areas and planned port construction areas.
2) PUR underwater cables should not be suspended in water, but should be buried under water. In waters such as navigable waterways that need to be protected from external mechanical damage, PUR underwater cables should be buried in trenches of appropriate depth under the water, and should be covered and protected firmly; the buried depth of shallow water areas should not be less than 0.5m, and the buried depth of deep water channels should not be less than 2m.
3) It is strictly forbidden to cross or overlap PUR underwater cables. Adjacent cables should maintain a sufficient safety distance and meet the following requirements: 1. In the main channel, the cable distance should not be less than 1.2 times the average maximum water depth. The distance to the shore can be appropriately shortened. 2. In non-navigable small rivers with a flow rate of not more than 1m/s, the distance between single-core cables of the same loop shall not be less than 0.5m, and the distance between cables of different loops shall not be less than 0.5m. Less than 5m. 3. In addition to the above, it should be determined according to factors such as water flow and cable buried depth.
4) The horizontal distance between PUR underwater cables and industrial pipelines, electrical design online teaching teacher Di; should not be less than 50m; depending on the situation, should not be less than 15m.
5) For the part of the PUR underwater cable leading to the shore, protective measures suitable for the laying conditions should be taken, and the following requirements should be met: 1. When the shore is stable, a protective tube and a protective trench should be used to lay the cable, and it can be installed if necessary. Work wells are connected, and the lower end of the pipe trench should be placed no less than 1m below the lowest water level. 2. When the shore is unstable, it should be laid in a circuitous way, and cables of appropriate spare length should be reserved.
6) Eye-catching warning signs should be set on both sides of the PUR underwater cable.
