According to Article 14 of the Regulations on the Protection of Power Facilities:

No unit or individual may engage in the following acts that endanger power line facilities:

(1) Shooting at power line facilities;

(2) throwing objects at wires;

(three) flying kites within 300 meters on both sides of overhead power lines;

(four) unauthorized use of electrical equipment on the wire;

(5) Climbing towers or erecting power lines, communication lines and broadcasting lines on towers without authorization, and installing broadcasting speakers;

(six) the use of poles, towers, stay as a lifting traction ground anchor;

(7) Tying livestock, hanging articles and climbing crops on towers and stay wires;

(8) Borrowing soil, piling, drilling, excavating or dumping acid, alkali, salt and other harmful chemicals within the prescribed scope of tower and cable foundation;

(9) Building roads between towers (excluding towers and towers) or between towers and stay wires;

(ten) the removal of tower equipment or stay, move or damage permanent signs or signs;

(eleven) other acts endangering power line facilities.

According to Article 12 of the Detailed Rules for the Implementation of the Regulations on the Protection of Power Facilities:

No unit or individual is allowed to borrow soil, pile, drill, excavate or dump acid, alkali, salt and other harmful chemicals within the following range of the outer edge of overhead power line towers and cable foundations:

(a) 35 kV and below power line towers, stay 5 meters around the area;

(two) 66 kV and above power line towers and stay around 10 meters area.

The following requirements must be observed when taking soil, piling, drilling and excavating outside the distance between the above tower and cable foundation:

(1) Reserve roads leading to towers and cable foundations for patrol, maintenance personnel and vehicles;

(two) shall not affect the stability of the foundation, such as soil and gravel around the foundation may cause landslides, units or individuals engaged in the above activities should be responsible for the construction of slope protection and reinforcement;

(three) shall not damage the grounding device of power facilities or change its buried depth.

The above is the distance you need to pay attention to when digging. Although the distance is met, the excavation must be carried out on the premise of ensuring the safety of the foundation.

2. Common sense of power engineering How to ensure the safety of manual excavation?

In order to ensure safety, manual excavation should be carried out according to the following steps: (1) When manual excavation is carried out, the distance between two people should not collide (generally 2? 3m), and should be top-down excavation step by step, it is forbidden to use the method of digging holes.

(2) When moving soil upward in the foundation pit, steps should be dug on the slope, and the width should not be less than 0. 7m, and the height difference between adjacent steps shall not exceed 1.

5 million. It is forbidden to use the soil retaining bracket to shelve earth-moving tools or stand on the bracket for transshipment.

(3) When lifting the bucket with lever type or grinding type for earthmoving, always check the firmness of the rope, pulley and bucket. Nobody is allowed to stay under the bucket.

(4) When excavating stone manually, the tools must be in good condition and the position should be stable. Hammer and welder shall not work face to face, and welder shall wear protective gloves.

(5) When the stone after blasting needs to be manually pried: (1) It is forbidden to stand in the sliding direction of the stone or pry the upper and lower floors at the same time, and the diggers should keep a proper distance; (2) It is forbidden to pass below the excavation site, and it should be guarded by special personnel; (3) Remove the suspended layer, and finish the excavation operation only after digging the slope without danger; (4) When working on the steep slope of hanging rock, you should wear your seat belt. (6) Stones that can't be transported should be chopped into small pieces.

When using iron wedge to split stones, the distance between people shall not be less than1m; When chopping stones with a hammer, the distance between people shall not be less than 4m.

3. Communication tower foundation

Excavation requirements

The foundation pit is formed by manual excavation. According to the requirements of design drawings, retaining walls must be set at the same time when digging. Generally, the concrete thickness of retaining wall is 100~ 150㎜, the height of each section is 1000㎜, and the strength grade of concrete is the same as that of pile body. The retaining wall in the first section shall be 150 ~ 200mm higher than the ground, and the upper and lower sections shall be overlapped by not less than 50mm.

Sub-pit of linear tower foundation

We can use the method of linear pile repetition to determine whether the position of the central pile is correct, use the front mirror to determine the position deviation of the central pile, and control the horizontal direction within 50mm, otherwise use the front mirror method to correct it, and use the "alignment method between two points" to check the straight direction. Because the line mainly spans fruit trees, miscellaneous trees, sheds, brick houses and so on. , which brings obstacles to the perspective in the measurement process. It is suggested to adopt the method of high tripod, triangle and rectangle, but the accuracy should be strictly controlled.

Foundation pit construction is divided into two steps: excavation and cleaning, and manual excavation is generally used in foundation pit construction.

At the beginning of foundation pit excavation, it should be 30~50mm smaller than the design size, so as to trim the foundation pit.

For the excavation foundation in moderately weathered or Ⅲ, Ⅳ weathered rock areas, the method of combining manual excavation with small gun excavation can be used for molding.

After the foundation hole is formed, the hole should be inspected in time, the anchor bolts and steel bars should be installed, and the concrete should be poured as soon as possible after the acceptance, so as to prevent rainwater from accumulating in the hole and affecting the strength of the foundation pit.

Axial tension bar joints and small eccentric tension bar parts are all

Direct welding of steel bars with diameter greater than 25mm in ordinary concrete.

Steel bars and lightweight aggregate concrete shall be Grade I steel bars with a diameter greater than 20mm and Grade I steel bars with a diameter greater than 25 mm..

Use welded joints.