(a), strictly control the tower crane in the 230O safety zone within the scope of the construction area in the south half of the high-voltage line direction (see figure 1). In addition, an over-limit braking device is set at 270 of the rotating mechanism, which is used as a warning zone in the northeast 20 between 230 and 270. Safety measures are taken under special circumstances and approved by the project manager. Tower crane legs are not allowed to enter the restricted area at will, and strict monitoring measures are taken. Drivers must slow down in advance when the boom moves to the vicinity of the warning zone, and make a slight movement in the first gear to effectively brake. It is forbidden to lift materials with a length of more than 4m. (2) In the process of tower crane operation, when there is a power outage, a strong wind of magnitude 4 or above, or the wind continues to increase, the tower crane driver should immediately and quickly put down the lifting object, lift the hook to a place 2m away from the root of the boom, stop all lifting operations, and immediately release the brake of the rotating mechanism, so that the boom can rotate freely under the action of the wind vane, so as to prevent the sling or lifting object from touching or approaching the high-voltage line. As long as the rising height of the boom and hook is outside the range of the induced electric field of the high-voltage line, there will be no electric shock accident, and it will not cause the tower crane to forcibly brake the rotating mechanism when there is wind, damage the equipment or cause an accident of stepping backwards. (3) In the safe operation area, only the second gear micro movement is allowed, and it is forbidden to rotate under the fast gear, otherwise it will be regarded as a serious illegal operation, which will be supervised by the tower crane headquarters and the safety officer of the project department at any time. (4) Limit the maximum elongation of the trolley running on the jib and the lifting, loading and transportation height of the hook. After measurement and inspection, the trolley can only extend and retract within the scale line of 45 meters on the boom (see Figure 3). After lifting the material, the hook should be raised to the highest working height as far as possible, and then the material should be dropped after the specific lowering position, so as to ensure that the sliding distance of the trolley on the boom and the lifting height of the hook have enough distance from the induced electric field range of the high-voltage line. (5) Strictly dispatch and run the tower cranes. Because the north side of the two tower cranes is Kebei Avenue, and there are many pedestrians, the tower cranes should try to reduce the operation of the boom on one side of Kebei Avenue; At ordinary times, when the tower crane rotates, the hook height must be more than 6 meters above the horizontal line of the high-voltage line. After the work, the tower crane driver and commander should make a good inspection, and the recovery position of the hook and wire rope must also be more than 6 meters above the horizontal line of the high-voltage line (see Figure 2). (6) The tower crane shall be attached to the wall in advance. When the construction reaches the third floor of the ground structure, the tower crane shall be attached to the wall, and the tower crane shall be raised to 35 meters at one time, so as to ensure enough distance and avoid being out of the range of the induced electric field of the high-voltage line. (seven), set up high voltage electrostatic discharge device and protective facilities. 1. 4mm2 copper core shall be laid along the boom, balance arm and tower top, which shall be connected annularly and reliably grounded (lightning protection device can be connected); The grounding point of each tower crane shall not be less than 2 places (it can also be welded with the main reinforcement of foundation), and the grounding resistance shall not be greater than 1ω. 2, electrician tracking monitoring tower crane static electricity, found that the problem timely report processing. If static electricity occurs, make an insulating sleeve on the hook and replace it regularly. (eight), in the tower crane cab mesa with high voltage insulation pad, all electrical equipment to maintain good insulation. (9) Check the equipment and electrical devices of the tower crane, and use five-core wires to ensure that the working zero line and protection zero line of the power cord and electrical devices are separated, and the power supply is separated from the single-phase (lighting) control switch; And installed a leakage protector to make it play its due role. Download the paper (10), strictly do the daily lifting, transportation and blanking work to prevent materials from falling, especially when the tower crane rotates and runs near the warning zone of high-voltage lines, you should be extra careful. (1 1), strict daily inspection and acceptance of tower cranes, special safety technical disclosure and training for tower crane drivers, commanders, hook workers, electricians and operators involved in the use of tower cranes, training for tower crane safety technical operation, tower crane operation signals, gestures, semaphores, multi-tower operation, high-voltage line prevention, etc., so as to achieve close cooperation and skilled operation. At the same time, the person responsible for the operation shall be strictly responsible for the post, so as to be foolproof. (12), tower operation control. 1. There must be a height difference between the fuselage of two adjacent tower cranes, and no contact is allowed during rotation. When the adjacent tower cranes are hoisted (two tower cranes are arranged with enough fuselage clearance distance to avoid collision between the two fuselage). 2. The low tower gives way to the high tower: the low tower crane should observe the operation of the high tower crane before turning the arm. 3. The movable tower makes way for the static tower: when working in the cross area of two tower cranes, the movable tower should avoid the static tower when the tower arm of one tower crane does not rotate, the trolley does not walk and the hook does not move, while the tower arm of the other tower crane rotates or the trolley walks. 4. Make way for heavy trucks without load: When two tower cranes are running at the same time, the unloaded tower crane should avoid the loaded tower crane. Other precautions (1). All operators should strictly implement the "ten no-lifting" regulations. (2) When the tower crane is suspended for a long time, the hook should be at the highest point, the car should be at the nearest point, and the boom should stop with the wind. (3), in order to ensure the progress of the project and the safety of the tower crane, tower crane to ensure that there is a tower crane driver on duty 24 hours a day, do have problems found in time, emergency rectification, put an end to safety accidents. (4), tower crane and signal commanders must be equipped with walkie-talkies. The walkie-talkie must be locked after the frequency is determined uniformly, and the user has no right to adjust the frequency, so it is dedicated to the special plane and cannot be borrowed. (5) The signal commander shall be relatively fixed with the tower unit, and the commander shall not be changed at will without special reasons. Without the consent of the on-site safety officer, the commander shall not change shifts, and the face-to-face handover system shall be adopted when changing shifts.