METHODS OF CONSTRUCTION OF MEDIUM VOLTAGE UNDERGROUND CABLES
Are you still looking to learn about the construction method of medium voltage underground cables? Join Hung Nghiep Phu to refer to the article below to find the best solutions for your business!
1. Preparation work
Công tác chuẩn bị trước khi thi công cáp ngầm trung thế vô cùng quan trọng
For the preparation work when constructing medium voltage underground cables, the construction unit must conduct a survey to carefully check the actual terrain of the route; select the optimal treatment plan for each obstacle point as well as mark and outline the exact route, and divide the excavation into reasonable segments for each construction team.
Next, the contractor needs to contact the Project Management Board to register the construction schedule, complete the registration procedure for digging trenches to spread the underground cable system.
In addition, the contractor also needs to send a notice to the Supervision Consultant about the construction schedule so that the Supervision Consultant can have a detailed plan to monitor the construction process.
Finally, the construction unit needs to prepare warehouses, camps and gather materials for construction.
2. Cable trench digging and cable laying construction
The cable trench digging and cable laying stages include the following detailed steps:
- Divided into different shifts to minimize the impact on traffic and construction progress of other contractors in the project area.
- Using a completely manual construction method when digging cable trenches, the main construction tools are pickaxes, pickaxes, crowbars, spades, digging shovels, shovels, etc. In the case of digging across the road, the construction unit needs to use a specialized concrete cutter, concrete drill to remove the hard construction layers on the surface, then continue to dig manually as above.
- The process of transporting soil and rock must be carried out in parallel with the digging of cable trenches to avoid affecting traffic and daily life of residents. The arrangement of means of transporting waste soil out of the construction site to the staging area must be done manually, such as improved vehicles, etc.
- After the supervisory consultant confirms that the cable trench has been dug to the required size, spread a 100mm thick layer of sand under the cable and compact it with a compactor, then install the HDPE 195/150 pipe on top, the HDPE pipe is spread at a depth of 0.8m.
- Arrange the cable release at a suitable location, use a crane to place the cable reel on the release; and manually pull the cable along the cable route in the HDPE 195/150 pipe; All racks, support shafts, brakes, etc. must be thoroughly inspected before use.
- When manually releasing the cable, rollers must be placed along the release route to support the cable; to ensure the cable slides smoothly, avoid rubbing or being dragged on the asphalt; sharp hard objects, etc. that can scratch the outer shell of the cable.
- When spreading the cable, it is important to pay attention to follow the direction of the arrow on the cable batch.
- At the place where the cable changes direction, the bend radius of the cable must ensure technical requirements > 0.6m.
- All cables on the route are threaded in HDPE 195/150 plastic pipes, placed at a depth of > 0.8m. When threading cables in pipes, be careful to avoid damaging the cable sheath.
- In case of crossing with water pipes, the cables must be placed below and ensure the distance between the cables and the water pipes is > 0.5m.
- The distance between 2 parallel power cables is > 0.25m. In case of running parallel with information cables, the distance between them must be > 0.5m. In case of crossing with information cables, the power cables must be placed below; and threaded in steel pipes, the distance between 2 cables is > 0.25m.
- Horizontal distance from cables to construction works > 1m.
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Making cable ends:
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Unpack the equipment box, check the quantity of materials in the box to see if it is sufficient; and correct in specifications as in the attached list.
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Bring the cable end to the position of the cable box and measure the length. Determine the required size of the cable end, you can remove the excess.
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Determine the length of the outer protective layer of the cable that needs to be removed; (according to the catalog of the specific cable head).
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Saw off the cable sheath.
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Separate the cable cores.
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Connect the cable junction box according to technical requirements and instruction catalog.
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3. After construction of medium voltage underground cable
After laying the cable, the construction unit continues to spread a 300mm thick layer of cushion sand on top; and compact, fill with 300mm thick fine soil, cable route signal tape; fill with 200mm thick compacted fine soil.
There must be no bricks, stones, construction components, trash, or organic waste in the cable trench filling soil. Finally, the construction unit restores the construction site and completes the acceptance procedures.
4. Introducing a reputable design & construction consulting service provider
The importance of construction units is undeniable, their reputation will ensure the quality and aesthetics of your project. Currently, there are many units providing design and construction services to meet the increasing construction needs in our country. Therefore, finding a reputable unit is not easy and requires you to spend time researching. In the selection process, you need to research carefully and ensure that the accompanying unit must have high expertise, many years of experience, have a clearly signed contract, transparent costs, ... To help customers save time searching, Hung Nghiep Phu Construction Investment Co., Ltd. is confident that it will be the best choice for you.
Hung Nghiep Phu Construction Investment Co., Ltd. with the mission of providing the best solutions and services, building a prosperous community with customers, Hung Nghiep Phu is gradually affirming its brand through sincere cooperation, with a leadership team with ethical capacity, creativity, high expertise and strategic vision. Hung Nghiep Phu owns a team of skilled, highly qualified employees who will bring customers the best quality technology.
Hung Nghiep Phu Construction Investment Co., Ltd. - specializes in constructing civil and industrial works. We look forward to accompanying customers in construction projects as well as continuous procedures such as planning diagrams, applying for construction permits, completing procedures, applying for fire prevention and fighting certificates, ... If you have any questions or are in need of design, completing procedures, please contact us immediately for free consultation!
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Source: Compiled from the Internet
