ADSS Fiber Optic Cable Installation Solution

Optical cable construction specifications and standards are of great significance to the stability of communication networks, protecting the durability of overhead optical cables, and ensuring the safety of personnel and equipment. SOCT has rich experience and insights in the production of optical cables and other communication equipment, so let us introduce the 11 processes in the construction process of overhead optical cables: Pole Route Planning, Suspension Wires, Guy Wires, Steel Rod Ground Anchors,High-Tension Pile-Supported Poles,Cable Equipment Inspection,Cable Allocation,Cable Splicing and Installation,Cable Deployment,Protection and Grounding,Marking Pole Numbers. This solution will analyze the above 11 processes one by one.

1.Pole Route Planning

Try to avoid large buildings when choosing a route. There should be no less than one inverted pole position parallel to the power pole road. The drainage ditches on both sides of the pole road leaving the road are required to be 2 to 5 meters. For the 8-meter wooden pole burial depth, in ordinary The soil is 1.5 meters, the hard soil is 1.4 meters, the stone is 1.2 meters, and the span is 50 meters. If the excavation depth cannot meet the requirements, cement piers must be made. The dimensions of the piers are 80cm in diameter at the upper bottom, 120cm in diameter at the bottom, and 80cm in height. When erecting optical cables on the same pole as overhead optical cable lines and power lines, the minimum vertical clear distance should be no less than 2.5 meters.

2.Suspension Wires

The specifications of the hanging wires are generally 7/2.2, 7/2.6 and 7/3.0. When the pole distance is large, measures such as the main and auxiliary hanging wires should be used. The hanging wire hoop should be placed slightly 40 to 60cm away from the pole and should not be less than 25cm. The distance between the first layer of suspension wires and the second layer of suspension wires is 15cm. The position of the suspension wires cannot be changed in any direction. Long pole suspension wires over 100 meters must be auxiliary pull wires. If the flying wire spans more than 400 meters, a transitional intermediate pole must be erected in the middle.

3.Guy Wires

7*2.2 steel strand main suspension wire, the angle depth is less than 7.5 meters, the pulling wire should use 7/2.6 steel strand. If the corner depth is more than 7.5 meters, the cable should be made of 7/3.0 steel strand. The head pull wires are all made of 7/2.6 steel strands. Angle poles with a corner depth of more than 15 meters should be equipped with herringbone cables, and the distance ratio of the cables should be 1:1 but not less than 0.75. The windproof pulls are arranged at one place with 8 poles, and the square pulls are usually arranged at about 32 poles (the longest length shall not exceed 48 poles). Auxiliary line installation is required for square pulls.

4.Steel Rod Ground Anchors

In principle, the steel handles are 1800mm*12mm, 2100mm*16mm, and 70*20mm ground anchors are made of cement-made 600mm*400mm squares and 800mm*40mm squares. Where the corner poles are pulled along the line, 2100mm*1600 steel handle ground anchors are used, and the windproof pull wires are used on the sides. The guy wire should use 1800mm*12mm steel handle ground anchor. The special pole should use 2400mm*20mm steel handle ground anchor. The angle rod guy wire position allows a deviation of 5cm. The allowable deviation of other steel handle ground anchors is 10cm. The eight-shaped steel handle ground anchor should be moved inward by 60 to 70cm.

5.High-Tension Pile-Supported Poles

The high-tension pile pole should be slightly tilted 60 to 80cm toward the pull line and opposite to the direction. The distance between the tensioning hoop and the pole should not be less than 25cm. Support rods must not be installed on corner poles with a depth of more than 7 meters. The roots of the support poles must be buried deep. 40 to 60cm, the hanging plate cross arm should be installed at 1/5 of the pole.

6.Cable Equipment Inspection

The inspection contents include quantity, specifications, appearance, certificate, length, optical cable single disk inspection, core loss inspection and corresponding paper records.

7.Cable Allocation  

Calculate the total length of the optical cable erection and the overall optical fiber transmission quality requirements based on the retest route, and select a single optical cable. The optical cable should be installed as a whole as possible to reduce intermediate joints.

8.Cable Splicing and Installation

During the splicing test, the OTOR instrument must be strictly used for testing (single fiber splicing loss ≤ 0.04dB, average trunk loss ≤ 0.23dB/KM), and the splicing should be connected according to the factory chromatographic order to ensure that the average fiber splicing loss complies with regulations and ensures transmission. quality.

9.Cable Deployment

When laying optical cables, excessive bending or twisting is not allowed to damage the protective layer. The distance between optical cable hooks is 50cm (±3cm), and the remaining wires on both sides of the optical cable connector box are preferably 10 to 20 meters. A reservation is made every 500 meters or so, and the reserved length is 5-10 meters. The natural bending length of the overhead optical cable is 5 meters/km. Ordinary poles generally make a telescopic remaining bend every 10 poles.

10.Protection and Grounding

Lightning protection wires that are pulled into the ground must not touch the hanging wire hoops. Directly buried or lightning protection wires should be installed every 500 meters on square wire poles and straight poles. The hanging wires on overhead poles should be grounded at an average interval of 6-9 poles. Close to Combustible areas should be wrapped with asbestos tape for protection. The outside of the asbestos tape should be wrapped with PVC tape. At the intersection with the power line (power lines above 220V should be insulated and protected), a 2.5-meter steel pipe must be introduced into the ground where they are overhead.

11.Marking Pole Numbers

The pole signs and pole numbers should face the road side, and the pole number should be painted with white paint, and the last word should be no less than 2 meters away from the ground.