Safety nets must be installed below any work area at height. When the building height exceeds 4 meters, a safety net must be installed that gradually rises with the wall, followed by a fixed safety net every 4 meters. Safety nets must be installed at the top and bottom of scaffolding and bridge-type structures. The safety net should be installed with the inner edge lower than the outer edge, with a height difference of approximately 50 cm between the protruding parts. Supporting members must be free of breaks or bends. The gap between the inner edge of the net and the wall surface must be less than 15 cm. The distance between the lowest point of the net and the surface of the object below must be greater than 3 meters. For the supports used in the installation of the safety net, the small end diameter of wooden poles must not be less than 7 cm, and the small end diameter of bamboo poles must not be less than 8 cm. The spacing between the support poles must not exceed 4 meters.
Before use, the safety net should be inspected for corrosion and damage. During construction, the safety net must be intact and effective, with reasonable support, even stress distribution, and no debris inside. Overlaps must be tight and secure, without gaps. The installed safety net must not be removed or damaged during construction; it can only be removed when there is no more work at height. When temporarily removing an erected safety net for construction purposes, the construction unit must notify and obtain the consent of the erection unit before removal. Upon completion of construction, the net must be immediately restored by the construction unit according to regulations, and can only be used after inspection and approval by the erection unit.
Debris inside the net should be cleaned regularly. When welding work is carried out above the net, effective measures should be taken to prevent welding sparks from falling onto the net; the area around the net should not be exposed to prolonged or severe acid or alkali fumes.
Safety nets must be inspected frequently during use, and usage records should be kept. Safety nets that do not meet requirements should be disposed of promptly. When not in use, safety nets must be properly stored and protected to prevent moisture and mold. Before using a new net, the product nameplate must be checked: first, determine whether it is a horizontal or vertical net; horizontal and vertical nets must be strictly distinguished, and a vertical net must never be used as a horizontal net; when erecting a vertical net, the bottom tie ropes must be securely fastened; the manufacturer's production license; the product's certificate of conformity; if it is a used net, it should be tested before use, and a test report should be available; only used nets that pass the test can be used.
Inspection Method: Penetration Resistance Test. A 6m long and 1.8m wide dense mesh netting is tightly bound to a test frame inclined at 30° to the ground, with the netting taut. A scaffolding pipe with a diameter of 48-51mm and a weight of 5kg is dropped freely from a height of 3m above the center of the frame; the standard for passing the test is that the pipe does not penetrate.
Impact Test: A 6m long and 1.8m wide dense mesh netting is tightly bound to a rigid horizontal test frame. A 100cm long, 2800㎡ base area, and 100kg human-shaped sandbag is placed with its long side parallel to the long side of the dense mesh netting, and dropped freely from a height of 1.5m above the center of the netting; the netting rope should not break.