Which hero has the construction and acceptance specifications of optical cable direct burial urgentl

Strong and weak current lines are laid in parallel, with a distance of 1 meter or more.

Burial depth: direct burial laying and pipe laying are below the local permafrost layer. For example, the burial depth in the Beijing area: under the natural ground.

When crossing the road, the line laid directly buried should be protected by a steel pipe; The directly buried laying line should be constructed in accordance with the requirements of the national standard atlas "Outdoor Cable Burling", and the general construction drawings will give the practice and refer to the atlas number of the atlas.

The so-called "Caesar, Kai brick" is a specification of the cable: armored cable (can be directly buried).

GB50217-2007 Code for Design of Electric Power Engineering Cables

Armoured cables, not Kai bricks.

The standards for directly buried compound cables are as follows:

1) The voltage level, model specification and path of the directly buried cable meet the design requirements, and the quality of the cable body is qualified.

2) The embedded depth of the cable should meet the following requirements:

The distance between the surface of the cable and the ground should not be less than 1m when crossing farmland, and the cable should be buried below the frozen soil.

In the cable into the building, and the underground building crosses.

3) In the cable path may cause the cable to be subject to mechanical damage, chemical action, underground current, vibration, thermal impact, humus, insects and other dangerous sections, should be in accordance with the requirements of the code to take protective measures.

In addition to directly buried cables, there are the following common cable laying methods:

1. Lay in the cable tray.

2. Lay along the steel cable.

3. Pipe laying.

4. Fix and lay along the wall with line cards.

5. The cable trench (tunnel) is laid along the cable support.

Direct burial cable is in accordance with the requirements of the specification, after digging the direct buried cable trench, lay a sand cushion at the bottom of the trench, and remove the debris in the trench, and then lay the cable, after the cable is laid, it is necessary to fill the sand immediately, and cover a layer of bricks or concrete slabs on the cable to protect the cable, and then backfill a cable laying method.

The cable embedding depth shall meet the following requirements:

The distance between the cable surface and the ground should not be less. It should not be less than 1m when crossing farmland. Where the building is introduced, intersected with the underground building and bypassed the underground building, it can be buried shallowly, but protective measures should be taken.

The cable should be buried below the frozen soil, and measures should be taken to prevent damage to the cable when conditions are limited.

The minimum clear distance between cables, parallel and crossed between cables and other pipelines, roads, buildings, etc., shall comply with the provisions of the following table. It is strictly forbidden to lay the cable parallel above or below the pipe.

The upper and lower parts of the directly buried cable should be paved with a soft soil or sand layer not less than 100mm thick, and covered with a protective plate, the covering width should exceed 50mm on both sides of the cable, and the protective plate can be made of concrete cover or brick. There should be no stones or other hard debris in soft soil or sand.

Directly buried cables should be set up at 50 100m in straight sections, cable joints, turns, into buildings, etc., and obvious orientation signs or stakes should be set.

The main requirements for the laying of directly buried power cables are:

Directly buried cables should have armor and anti-corrosion protective layers.

The depth of the directly buried cable is generally not less than, not less than 1m in farmland, 35kv and above is not less than 1m, if the above requirements cannot be met, protective measures should be taken.

Directly buried cable should be evenly laid on the cable 100mm thick fine sand or soft soil, the upper side of the cushion should be covered with cement cover or brick connection, and bricks, stones and other debris should be removed when backfilling.

Directly buried cables should be set up with obvious azimuth markers at corners, joints, crossings, and in and out of buildings. Straight sections should be appropriately added with stakes. It is advisable to expose the stake 150mm above the ground.

When the cable passes through a place containing acid and alkali, slag, lime, etc., it should not be buried directly; When it is necessary to pass through the lot, anti-corrosion protection measures such as cylinder tile pipes and cement pipes should be adopted.

Directly buried cables should not be laid horizontally above or below various pipes;

When the cable is laid along the slope, the intermediate joint should be kept horizontal, and when multiple cables are laid in the same trench, the position of the intermediate joint should be staggered before and after.

When laying the cable, the cable should be prevented from spraining and excessive bending, and the ratio of the bending radius of the cable to the outer diameter of the cable should not be less than the following provisions: paper insulated multi-core power cable, lead clad 15 times, aluminum clad 25 times.

Before laying the power cable, check whether the model, specification and length of the power cable meet the design requirements and whether there is any external damage. Low-voltage power cables are used with a 1000V megohmmeter to measure the insulation resistance, and the insulation resistance value should generally not be less than 10m; High-voltage power cables are used with a 2500V megohmmeter to measure the insulation resistance, and the insulation resistance value should generally not be less than 400m.

1) The construction of optical cable should be carried out in strict accordance with the construction specifications;

2) When the optical cable turns, its turning radius should be greater than 15-20 times the diameter of the optical cable itself, such as the overhead optical cable in the upper and lower towers, the bending angle should be reduced as much as possible, and at the same time the optical cable tray should be assisted to reduce the tension of the optical cable's defense line;

3) Before the deployment of the optical cable, the construction and related personnel should be properly trained on the matters that should be paid attention to in the construction, such as the essentials of pay-off methods and safety, and ensure that the construction personnel obey the command;

4) Relevant personnel should be arranged to be distributed at the pay-off of the optical cable reel, crossing the obstacle point, the terrain bend, etc., so as to find the problem in time, eliminate the fault, control the speed in the pay-off, and reduce the tension of the pay-off reel;

5) If there is an obstacle in the process of fiber optic cable deployment, stop dragging and dropping and eliminate it in time. It cannot be dragged through with great force, otherwise it will cause damage to the optical cable;

6) When the optical cable is pay-off, the tension should be stable and should not exceed the required tensile force of the optical cable standard.

7) When the optical cable is subjected to large tension and passes through a pulley with a small bending radius or a hard surface with edges and corners at a small angle, the local side pressure of the optical cable will be much greater than the rated value, so that the internal structure of the optical cable will be damaged, and in serious cases, the fiber will be broken.

8) The construction unit of the optical cable should constantly sum up experience, strive to improve the construction quality, and prevent the occurrence of similar construction accidents.

The bottom is lined with fine sand, and the top is covered with bricks or covers. meters above.