How much is the crane arm of the tower from the residential building recently?
No aluminum conductor or steel shall be used as grounding or ground wire for the installation of tower cranes. A bolted wire must have an end. Grounding is mainly made up of the following three ways:1. the grounding body adopts a regular grounding pile, or a 33*4.5 long 1.5m steel tube, or a 70*70 long 1.5m angle steel.2. the floor is made of steel plates or other metal plates with an area of 1 square meters. The ground is deep from the ground 1.5m.3. a copper conductor with a cross-section of not less than 28 mm or a steel conductor with a cross section of not less than 50 mm is buried in the slot and its embedment length is determined by the grounding resistance.In the above three ways, the grounding body leads the copper conductor, the sectional area shall be no less than 25, if the soil is not conductive, the sodium chloride (salt) can be embedded in the soil. Then irrigation. For walking crane, each rail must be grounded, and the two tracks are connected by wires. Electrical connections should also be made between the two rails, with a resistance of no more than 4.
(1) hook safety device: a sling that prevents the hook from slipping and is automatically slipped from the hook. A spring is arranged at the opening of the hook head to seal the opening; the spring sheet can only be pressed downwards and can not be turned upwards after being put into the sling to prevent the sling from falling off automatically.(2): reel insurance device is effective measure to prevent accidents caused by improper wire rope winding drum out outside. There are different ways to do this. The main reason is that a steel bar is welded outside the drum to restrict the wire rope to move within the reel range.(3) fixed foundation: the depth of digging pit is 600mm, the concrete is poured on the lime soil, the surface is smooth, and the waterproof and earthing protection measures are adopted.
(1) the drivers and signaling personnel of the tower cranes must be specially trained and issued certificates by the relevant departments, and attention should be paid to whether the type of tower used by the driver is consistent with the actual tower type.(2) special person special plane management, Captain responsibility system, and strict shift shift system.(3) the newly installed or repaired tower crane must perform the machine test operation according to the specifications.(4) tower crane should keep a safe distance from overhead transmission lines.(5) driver's room should be equipped with fire extinguishing equipment.
