Safety technical guidance for the erection and dis

Safety technical instructions for derrick erection and dismantling works

1. There must be strict regulations on the erection height and lifting capacity of the derrick, and overload use is strictly prohibited

2. The bottom of the derrick must be placed on a hard foundation, and the buried depth must not be less than 1 meter: on the ground, it must be firmly rolled with rolled piles. At least 8 piles shall be rolled on the base, and 75 ㎜ angle steel shall be used for pile rolling. The driving depth is 1.2m, and the upper part of the rolled pile must be firmly connected with the derrick chassis

3. The derrick with a height of 10 ~ 15 meters should be equipped with a group of cable wind (4 ~ 8); An additional group is set every 10 meters. The upper end of the cable wind rope shall be connected with the shackle with lifting lugs, and fastened with more than 3 steel wire rope clamps

4. If the derrick is attached to the wall, it shall be firmly connected with the building with rigid support, and the other points must be calculated. The derrick wall pole shall not be attached to the scaffold

5. When the derrick is erected to a height of 11 meters, a temporary cable wind must be set, and it can be removed only after the fixed cable wind or wall attached support is set. The included angle between the wind rope and the ground should be 45 ~ 60, and it must be firmly connected with the ground anchor or pile head. The ground anchor and pile head shall be safe and reliable, and there must be towing piles behind the pile head. If wooden piles are used, the diameter of wooden piles shall not be less than 15 cm, and the buried depth shall not be less than 1.5 m. It is forbidden to tie the cable wind rope to the tree, and the specified friction coefficient must be tested repeatedly on the pole

6. For the derrick with a height of more than 30 meters, the orchid screws on the cable wind rope must be insured. When crossing the road, reliable safety measures should be taken

7. The wind rope is not allowed to pass over the high-voltage line. The specified safety distance must be maintained between the cold and hot shock test and the high-voltage overhead line

8. The mast column should be vertical and stable, its vertical deviation should not exceed the height, the joints should be staggered, and the joints on the same plane should not exceed 2. The distance between the derrick guide pulley and the winch rope drum, the grooved drum should be greater than 15 times the drum length, and the grooved smooth drum should be greater than 20 times the drum length, such as the improved initial bonding strength

9. The width of the transportation channel of the derrick shall not be less than 1 m. The shelving point must be firm. Protective railings must be set on both sides of the channel, and safety doors or safety fences must be installed

10. The derrick basket must be equipped with anti falling device, jacking limiter and safety door; Safety baffles or pieces are installed on both sides of the basket, and the height shall not be less than 1 meter to prevent objects such as trolleys from sliding. The welding of hanging basket must meet the specification

11. Isolation barriers must be installed around the bottom layer of the derrick and at the entrance. If the height of the derrick exceeds 30 meters, a double-layer safety shed must be set up; If the isolation shed cannot be set, the derrick must be hung with safety signs around, and the safety signs should be full

12. The derrick must be equipped with reliable lightning protection and grounding devices, and the winch should be separately grounded and equipped with a rain cover. Cause hidden dangers such as leakage of high-speed railway bridges

13. The winch should adopt the inching switch

14. There must be eye-catching signal devices or signs on the derrick basket and each floor

15. For the derrick equipped with lifting handle, there should be 3 ~ 4 tons of ballast at the bottom. The base of the handle should be higher than the building. The top of the handle should not be higher than the derrick. The included angle between the lifting handle and the derrick should be 45 ~ 70, and safety wire rope should be set. The hoisting wire rope shall be equipped with a limit device. The handle shall not touch the cable wind rope

16. No one is allowed to ride in the derrick basket

17. When the beard of the derrick is maintained, it must be stopped

18. The flat brace, diagonal brace and cable wind rope of the derrick are strictly prohibited to be removed at will

19. When removing the derrick, set up temporary cable wind first. In case of a derrick with two layers of wind ropes, reliable safety measures shall be taken for the lower layer of wind ropes before the top layer of wind ropes can be removed

20. A warning area shall be set up for the erection and dismantling of the derrick, and a specially assigned person shall be responsible for it. The operator must wear a safety belt