Preventive measures for 360-degree rotating collision accident of tower crane

Anti-collision measures for tower crane construction: the construction area of this project is 7 1583.52㎡, the first floor construction area is 22,328 ㎡, the maximum building height is 34.907m, the indoor absolute elevation of 0.000 is 6.000m, and the current ground height is 5.00-6.50m；; ; The difference is 0.5-1.00m; The independent installation height of this tower crane is 46m, the arm length is 60m, and the weight of the crane at the arm end is greater than1.2t. According to the Safety Regulations for Tower Cranes (GB5 144-94) and (JJ130-21. Its performance parameters and technical indicators are leading in China, reaching the current international advanced level. The maximum working range of the tower crane is 60m, the independent installation height is 46m, the maximum attached installation height is 220m, the maximum load is 6t, and the minimum load is1.3t. The independent installation height of this tower crane is 46m, the length of the boom is 60m, and the lifting weight at the end of the boom is above1.2t. In order to prevent multiple booms from colliding with each other during construction, it is necessary to set the tower crane position, crane arm length and crane arm length. Ensure the safety of tower crane operation. Starting from the reality of the construction site of this project, the nearest tangent point of the arm ends of adjacent tower cranes is 18.00m, so the free installation height of tower cranes can be used for work. In the working process of tower crane, the height difference method can be used to prevent collision (see the attached figure for the specific installation location), and the following operating procedures must be followed when installing (disassembling) and using; I. Anti-collision measures for multi-tower boom The location and installation of tower crane must be arranged and installed according to the following regulations: 1. The minimum erection distance between towers shall ensure that there is a distance of at least two meters between the boom end of the tower crane in a low position and the tower bodies on both sides. The vertical distance between the component at the lowest position of the high tower crane (the balance weight when the hook rises to the highest point or the highest position) and the component at the high position of the low tower crane should not be less than one standard section (one standard is 2.8m). 2. The boom of five tower cranes can rotate 360 degrees once a week; The tower crane is controlled by the installation height limit to ensure that the tower arm of the tower crane does not collide. 3. The installation height of 1 # tower crane is 14 standard section, that of 2 # tower crane is 13 standard section, that of 3 # and 4 # tower crane is 15 standard section, and that of 5 # tower crane is 14 standard section. Prevent five tower cranes from colliding with each other on the same working face. Description: 1, the length of five tower cranes is 60m, and the distance between tower and tower installation center is more than 95m. 2, height limit control height range, to ensure that the tower crane two tower arm in cross operation, tower arm does not collide. Two. Safe use and management scheme This scheme is specially formulated to ensure the safe operation of the hotel tower and the safe production of the project. Because of the long distance, the operation of tower groups should not only meet the production requirements, but also reduce mutual interference, so reasonable arrangement is very important. Make a plan for plane layout and three-dimensional coordination before installation. 1, the plane layout shall cover the whole construction surface as far as possible, and no or less blind areas shall be produced; Adjacent tower cranes should have enough safe distance; When the tower crane rotates, the coverage should overlap or not overlap as much as possible. 2. In the process of vertical transportation, the tower crane should be able to pass through the on-site construction components to ensure that objects with different geometric sizes have enough clearance distance to be hoisted to the required working platform. 3. The tower crane should have sufficient height. After considering the hook height, sling height, hanging object height and safety limit height, there should be enough vertical distance to ensure the horizontal transportation of various objects with different geometric sizes. 4. The distance between tower cranes should be staggered to ensure that the hooks will not collide with each other when rotating at the maximum height. 5. Avoid all facilities within the construction scope (such as adjacent buildings and high-voltage overhead lines). ), and isolation protection at a dangerous distance. 6, adhere to the principle of high in the middle and low around, because the center tower crane is influenced and restricted by the surrounding tower cranes, so the center tower crane should be kept as high as possible and ensure its best technical performance. 7. Ensure that the horizontal and vertical safety distance between the tower crane and the adjacent buildings and structures is greater than 2m when rotating, and the horizontal and vertical safety clearance of the suspended objects in the work must also be greater than 2m. 8, synchronous lifting, to ensure that the vertical distance between towers meet the requirements of three-dimensional coordination scheme. 9. Adhere to the operation principle of tower group operation ① The principle that the low tower gives way to the high tower: When the low tower is running, observe the operation of the high tower before running. (2) The principle that the rear tower gives way to the first tower: When the tower crane runs in the overlapping coverage area, the tower crane entering the rear area should avoid the tower crane entering the first area. ③ Principle of moving the tower to make the tower static: When the tower crane enters the overlapping coverage area, the tower crane should avoid the area and stop the tower crane. (4) The principle of avoiding heavy vehicles When two towers are running at the same time, the unloaded tower crane should avoid the loaded tower crane. ⑤ Principle that the passenger tower makes way for the main tower: When the tower crane in another area enters the tower crane area of others, it should take the initiative to avoid the main tower crane. ⑥ Principle of synchronous lifting: All tower cranes should be lifted and lowered uniformly within the specified time according to the specific construction conditions, so as to meet the requirements of three-dimensional construction coordination scheme for group towers. The third is to require on-site management to be strengthened and strictly controlled. 1. Establish a unified coordination mechanism. Establish a unified tower group operation management organization and management network, with sufficient personnel, define the responsibilities of leaders, construction organizations, drivers, commanders and maintenance personnel, make unified arrangements, use and command for on-site use and management, improve tower group operation procedures, train relevant personnel, hold relevant certificates, and all personnel operate and command according to the procedures. 2. Reasonable construction organization. According to the on-site production demand, wind direction and climate, as well as the maintenance of each tower crane, the use of tower cranes should be arranged reasonably, the synchronous operation should be minimized, and the notice of coordinated operation should be issued to the operators and commanders in time. 3. Improve the report inspection system. Report all kinds of problems and hidden dangers in the construction in time, check them in time, notify them in time, arrange maintenance reasonably, and ensure that all tower cranes are always in good condition. 4. Strengthen liaison and communication management. During tower group operation, each single machine shall be numbered uniformly, and the operator and signal commander of each single machine shall be determined and kept fixed. The site should be equipped with intercom equipment for tower equipment operators and related personnel. The interphone frequency of each unit must be locked separately. Without approval, no one is allowed to change the personnel combination, walkie-talkie frequency or command without authorization. 5. Strengthen command and management. When the signal commander gives an action command, he should first call the number of the tower crane being commanded, and the tower crane action command can only be given after the tower crane operator responds. At the same time, the signal commander must always visually observe the hook and hanging object of the tower crane. During the operation of the tower crane, the commander should look around the nearby tower crane and other facilities and give instructions in time. Safety instructions should be clear, short, complete and clear. When the tower crane is suspended for a long time, the hook should be hoisted to the highest and nearest position, and the boom should be parked in the downwind position. Four. Multi-tower suspenders 1 anti-collision measures. Inspection before operation and inspection during operation: ① Appearance of mechanical structure: all transmission mechanisms should be normal. (2), gear box, hydraulic oil tank oil level should meet the standards. (3), the main parts of the connecting bolt should be no loose. (4), wire rope wear and fixture fastening and pulley wear should comply with the regulations. (5) The power cable shall be undamaged. Starter is not allowed to be used as working zero line. 2, check whether the power supply voltage is in line with the voltage, start the control switch should be in zero before sending, after connecting the power supply, check the metal structure without leakage. Lighting and crane main circuit breakers should be tapped. When the main circuit breaker cuts off the power supply, the lighting should not be cut off. 3. During no-load operation, check the brakes, safety limits and protective devices of walking, slewing, lifting and luffing mechanisms, and work only after it is confirmed to be normal. The operation should be as smooth as possible, and it is forbidden to drive and stop at random. 4. When the lifting weight is stable, it should be more than 0.5m higher than the obstacle it crosses. Hoisting drivers should do "Ten No Hoisting" during hoisting. 5. When getting off the plane, turn all the control switches to zero, turn off the switches in turn, close the doors and windows of the operation room, cut off the main power switch after getting off the plane, and turn on the high-altitude indicator light. 6, any personnel in the tower cap, boom, balance arm aerial inspection and repair, must wear a seat belt. 7. The location and installation of the tower crane must be arranged and installed according to the following provisions (1). The minimum erection distance between the tower bodies should ensure that the end of the tower crane boom in the low position is at least two meters away from both sides of the tower body; The vertical distance between the components at the lowest position of the high-position tower crane (the balance weight of the hook rises to the highest point or the highest position) and the components of the low-position tower crane shall not be less than one standard section (one standard section is 2.8m). See the floor plan for the layout of tower crane. (2) When the tower crane driver is handing over the shift, he should make disclosure seriously and fill in the disclosure record. (3) The tower crane driver stops the construction immediately when he finds an emergency. During construction in rainy season, it is necessary to do a good job in preventing electric shock, lightning strike, collapse and strong wind, and stop construction when the wind exceeds level 6 or above. (4) Before the tower crane driver stops working, the tower arm must be locked in the seasonal downwind direction to prevent the tower arm from colliding with the tower arm due to natural wind.