Electrical cable pre-embedded technology

First, the cable trench size

The outer power cable trench has a depth of 900 mm, the bottom of the trench has a width of 400 mm, and the upper width is 600 mm.

Second, cable trench construction

1. According to the width of the cable trench, ensure sufficient working space and draw the edge line;

2. Before the cable trench is excavated, find the underground pipeline to the elevation, and excavate the sample hole, mark it, monitor it at any time during construction, and protect it;

3. Set a fully enclosed safety fence around the road junction and cable trench, and set up a warning tape;

4. Cable trench soil shall not be piled up near the cable trench to hinder construction, nor shall it obstruct traffic;

5. When trenching is excavated, the following requirements should be met:

(1) shall not affect the safety of various pipelines and other facilities;

(2) Fire hydrants, pipe gate valves, gullies, measuring signs and manhole covers of various underground pipes shall not be buried and shall not interfere with their normal use.

6. Objects such as stone, roots and waste piles are buried in the bottom of the cable trench and should be removed or removed;

7. The bottom of the bottom needs to be trimmed before laying the cable protection tube, and then backfilling with fine soil;

8. The cable protection tube is pre-buried as a plastic coated steel pipe of φ160; the wall thickness is 4.5mm, and the inner diameter of the cable protection pipe shall not be less than 1.5 times the outer diameter of the cable;

9. The metal cable protection tube should first go to the burr of the nozzle, connect it with the sleeve, and fasten it with screws, and the connection is well sealed;

10. When the cable penetration depth does not meet 900mm, the cable penetration pipe shall be sealed with C15 concrete, but the buried depth shall not be less than 600mm.

Third, cable marking pile

Marking piles shall be provided in the trenches for excavation, the marked piles shall be buried at the starting point and the stopping point of the cable, and a marking pile shall be set every 20-30 meters in the straight section of the corner;

2. When the marked pile is on the road, the top of the pile is flush with the road surface; the top of the green belt is 150mm above the ground;

3. The cable marking pile is prefabricated with 150# reinforced concrete and buried in the center of the cable trench;

4. Cable marking piles should be selected according to the site conditions.

4. Cable well excavation and its pouring

1. The size of the middle head of a cable is 2580*1280*1200 (mm). After the foundation pit is excavated, the 10cm thick C20 concrete bottom layer is poured on the bottom layer, and the water seepage well at the bottom is 300*300*300 (mm). ), adding coarse sand.

At the same time, the bricks of the specification 240*115*53(mm) are used for brickwork and the φ150 plastic coated steel pipe is pre-buried on the foundation bottom layer. The height of the brickwork is 1m, and then the concrete is poured with C20 concrete, and the thickness is 200. Board position. The cover is made of reinforced concrete.

2. The brickwork is made of M10 mortar, and the inner wall is covered with 10:2 and 1:2 cement mortar;

3. The thickness of the cover steel reinforcement layer is 20mm;

4. The middle head well is only allowed to make an intermediate cable head;

5. The position of the cable through pipe in the figure is shown, and the depth of the buried pipe is determined in the actual project.

5. Restoration of municipal infrastructure such as sidewalks

1. Ground treatment

(1) After backfilling, manually clean the foundation pit, clean up the debris in the pit, and compact the foundation pit;

(2) After the foundation is compacted, the stone powder layer is laid, and the final depth of the groove after the stone powder layer is tamped is 15 cm.

2. Concrete cushion and tile laying

(1) laying concrete cushion; concrete cushion is made of strength C15 concrete, and the pouring thickness is controlled at 8-9cm;

(2) The tile layer should be lined before laying, the height of the tile should be consistent with the original tile, and the tile should be horizontal and vertical;

(3) When laying bricks, the bricks should be lightly placed, and the center of the bricks should be lightly tapped with a rubber hammer. If the bricks are not flat, the bricks should be picked up and re-paved, and the bricks are not allowed to be ash or padded. Tile the tiles on the full mortar.

3. Watering conservation

(1) After the paving of the bricks is completed, pedestrians are prohibited from walking on them, and watering is maintained at the right time. When the cement mortar reaches the design strength, the traffic can be opened;

(2) The watering in the early stage should be poured in small buckets, and the mortar should not be washed off. Do not overdo it once, control it in the surface layer, and it is better not to accumulate water.

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