Safety protection measures for grab cranes against falling from high altitude

 Safety protection measures for grab cranes to prevent falling from height

(1) General provisions of safety management technology

① The construction organization design or construction should be prepared before hoisting, and the safety technology of hoisting and the technical measures to ensure safety should be clarified.

②The personnel participating in the lifting should be qualified through the nose flower. Safety technical education and safety technical clarification should be conducted before starting hoisting.

③Before the lifting work starts, the specifications and technical performance of the lifting, transportation, loading and unloading and lifting equipment, as well as the rigging, clasps, clamps, fixtures, anchors, etc. used should be carefully inspected or tested. If any damage or looseness is found, do not Replace or repair. The lifting equipment must be tested. If it is found to be inflexible and worn, it needs to be repaired in time; the important components should be tested before hoisting, and the formal hoisting can be carried out after checking that all parts are normal.

(2) Prevent falling from high altitude

①The personnel involved in hoisting should wear safety helmets; personnel working at heights should wear safety belts, non-slip shoes, and tool bags.

②The hoisting work area should have obvious signs and special personnel should be guarded. People who are not related to hoisting are strictly prohibited from being inside. When the crane is working, it is strictly forbidden to stand or pass within the radius of rotation of the boom ballway.

③When transporting or hoisting components, it is strictly forbidden to stand on the transported or hoisted components to direct and place materials and tools.

④The construction personnel working at height should stand on the operating platform or portable ladder to work. The hoisting layer should be provided with temporary safety guard rails or other safety measures.

⑤Ladders and temporary consoles for climbing should be fastened firmly; the angle between the ladder and the opening should be 60-70°.

(3) Prevent objects from falling and hurting people

①When transporting objects to the ground at high altitude, they should be tied up with ropes and hung down. When hoisting, it is not allowed to stack or hang scattered objects on the components. Scattered materials and objects must be hoisted and transported after being tied with a cage, steel wire rope, or insurance line. The materials, objects and tools are not allowed to be thrown at will to prevent slippage and injury or accidents.

② The components must be fastened firmly, and the lifting point should pass through the position of the component tower lifting point. The lifting should be stable and avoid vibration or swing.

③When lifting components, the speed should not be too fast, and they should not stay at high altitude for too long. It is strictly forbidden to rise and fall to prevent the components from falling off.

④ Before temporarily fixing the components after they are in place, the hooks and lifting riggings shall not be loosened. After the component is fixed, the connection is firm and balanced and stable. When the connection is determined to be safe and reliable, the temporary fixation tool can be removed and the next step of hoisting can be carried out.

⑤Necessary anti-skid measures should be taken for hoisting in snowy, frosty and foggy days and emergency measures in rainy days, and adequate lighting should be provided for the night flight at night.

(4) Prevent objects from falling and hurting people

①When transporting objects to the ground at high altitude, they should be tied up with ropes and hung down. When hoisting, no scattered objects are allowed to be stacked or hung on the components. Sporadic materials and objects must be firmly tied with a cage, steel wire rope, or safety rope before they can be hoisted and transferred. Materials, objects and tools are not allowed to be thrown at will to prevent slippage and injury or accidents.

② The components must be bound firmly, the lifting point should pass through the center of gravity of the component, and the lifting should be stable and avoid vibration or swing.

③When lifting components, the speed should not be too fast, staying at high altitude for too long without authorization, it is strictly forbidden to rise and fall sharply to prevent the components from falling off.

④ After the component is in place, it is not allowed to loosen the hook or untie the lifting rigging before it is temporarily fixed. After the components are fixed, the connection should be checked for firmness and stability. When the connection is determined to be safe and reliable, the temporary fixing tools can be removed and the lifting can be carried out.

⑤ Necessary anti-skid measures should be taken for hoisting in snowy, frosty, and rainy days, and adequate lighting should be provided for night preparation.

(5) Prevent the crane from tipping over

①The road on which the crane travels must be flat, solid and reliable, and the parking place must be flat.

② Crane cliffs are not allowed to be parked on the slope to work, and the two covering belts or outriggers of the crane are not allowed to stay one high and one low, or the soil is one hard and the other soft.

③When hoisting components, the sling should be kept vertical and must not be pulled diagonally beyond the gyration radius of the crane, so as to avoid overloading and the wire rope from slipping off or pulling the rope to make the crane unstable. When lifting heavy components, ropes for pulling beams and columns should be provided.

④When the crane is operating, the boom must be smoothly raised, lowered, and rotated, and must not be shaken in the air. At the same time, try to avoid the occurrence of strange phenomena such as emergency braking resonance or shock vibration. Without taking reliable technical measures and without the approval of the relevant technical department, the crane was overloaded without authorization to avoid accelerating the wear of mechanical parts and causing the crane to tip over.

⑤The crane should avoid running at full load as much as possible; at full load or close to full load, it is strictly forbidden to perform both lifting and turning (lifting and horizontal rotation or lifting and walking) at the same time, so as to avoid uneven roads or inertial forces. The reason for the crane is to cause such overload and cause a rollover accident.

⑥When two hoisting machines are operated at the same time, a safe distance of more than 5m should be maintained between the suspended components of the hooks of the two machines to avoid collision accidents again.

⑦When lifting components with two cranes, reasonable load distribution should be carried out according to the lifting capacity of the cranes (the weight of the crane should not exceed 75% of the total accuracy of the allowable lifting weight of the two cranes, and the load of each crane should not exceed it. 80% of the safe load). During operation, the actions must be coordinated under unified command, while lifting and moving, and the hooks of the two cranes and the condition block group should be basically maintained in a vertical state. The drivers of the two cranes must cooperate closely with each other to prevent one crane from losing weight and overload the other crane.