Precautions for laying underwater optical cables

Things to consider when laying underwater optical cables. The laying of underwater optical cables should be carried out according to the actual conditions such as river bed soil quality, water flow width, water depth and flow velocity. Generally choose different methods such as using water excavator, manual excavation or flushing pump, flushing groove and anchoring. However, the following methods are generally used in deep and wide waters.

underwater cable

1 Optical cable loading: After the optical cable is transported to a certain place by ship, it should be transported to a dedicated laying ship, and the word "8" should be placed on the ship. The length of each inverted "8" is about 60 meters. The layer is in the middle, and the middle is evenly overlapped. The height of each pile shall not exceed 1.2 meters, and the direction of exit will be planned.

2 Install the outlet frame: In order to facilitate the gradual release of the optical cable from the ship, the outlet frame should be installed first. Automatic and manual dual-purpose hydraulic brakes are installed on the outlet frame to control the starting speed of the optical cable, and an indicator device for the length of the optical cable outlet is installed.

3 Laying by boat: After inserting flags on both sides of the river, lay by boat, and the course of the ship is controlled by a microcomputer. The microcomputer visually displays the wiring track of the printed optical cable to achieve the purpose of controlling the laying of the ship.

When the water level is deep, the water surface is wide, which is the mud river bed, and the optical cable can be laid with a water line digger. The optical cable is installed on the laying ship, the cable is laid, launched, laid, and the buried cable is completed at one time, and the depth is guaranteed.

When laying fiber optic cables in narrow bodies of water such as lakes and streams, man-made trenches can be used to bury the cables below the riverbed.

The buried depth of the underwater optical cable should be constructed according to the design documents according to the depth of the river, the specific conditions of navigation and the quality of the riverbed soil. Generally speaking, in areas where the water depth is less than 8 meters (referring to the dry season), when the river bed is unstable or the soil is soft, the buried depth should not be less than 1.5 meters; when the river bed is stable or the soil is hard, the buried depth should not be less than 1.2 meters; If the river bed is made of rocky or semi-rocky riverbed, the burial depth should not be less than 0.5m. In areas where the water depth exceeds 8 meters, it can generally be placed directly on the riverbed without burying it. Special locations shall be handled in accordance with relevant document requirements.

In addition to the need for armoring, fillers and other special technologies should also be used to solve the problem of waterproofing the core of underwater optical cables. Fiber optic cables used in shallow water require double armor to prevent them from being damaged by various underwater activities such as netting and fishing. When laying the optical cable, the optical cable must not be suspended or vacated in the river bed to prevent excessive bending and excessive tension of the optical cable. After the optical cable comes out of the water, the protection of the optical cable buried on the beach must be strengthened.

For navigation rivers where underwater optical cables are laid, areas where anchoring is prohibited should be delineated according to design requirements, and waterline signs should be placed on or on the river bank.

The above is a professional explanation and analysis of the matters that need to be considered in the laying of underwater optical cables.