22 Grade One Construction Engineer Mechanical and Electrical Engineering Golden Examination Building Grounding Project Construction, First Construction Scholar's Notes, Long Press to Like + Retweet + Comment for continuous updates, click on my avatar in Wendang Edition and send me a private message: 2022
1. Laying of grounding device It is required that the burial depth of the top surface of the
(1) grounding device should not be less than 0.6m, and should be below the frozen soil layer.
(2) round steel , angle steel , copper pipes, copper rods, copper pipes and other grounding electrodes should be buried vertically underground, and the spacing should not be less than 5m;
(3) The artificial grounding body is connected to the exterior wall of the building or The horizontal distance between foundations should not be less than 1m.
2. Overlap requirements for grounding devices
(1) The overlap between flat steel and flat steel should not be less than 2 times the width of the flat steel, and should be welded on at least three sides;
(2) The overlap between round steel and angle steel should not be Less than 6 times the diameter of the round steel, and should be welded on both sides;
(3) The overlap between the round steel and the flat steel should not be less than 6 times the diameter of the round steel times, and should be welded on both sides;
(4) The welding of flat steel and steel pipes, and flat steel and angle steel, should be close to the outer sides of the angle steel, or close to the surface of 3/4 of the steel pipe, and the upper and lower sides should be welded.
(5) When the grounding pole is composed of copper and steel, and the connection between copper and copper or copper and steel is done by thermal agent welding , the joint should have no penetrating pores and the surface should be smooth.
3. When the ground resistance cannot meet the design requirements, resistance reducing agent , soil replacement and grounding modules can be used to reduce the ground resistance.
