L46A1 Mast Section Safety device for tower crane
The tower crane safety device is an important device in all tower crane fittings, and it is an important barrier for the construction safety of tower crane. The following is the introduction of the tower crane safety device.
Safety devices for tower lifting
(1) Sling safety device: a safety device that prevents a sling from slipping off the hook. That is, a pressed spring piece is installed at the opening of the hook head, and the opening is closed. The spring piece can only be pressed down. After the Sling is placed, it can not be turned up, which can prevent the Sling from falling off automatically.
(2) Roller safety device: An effective measure to prevent the wire rope from causing an accident outside the roller due to improper winding. The practice is different. It is mainly to weld a steel bar outside the reel, limiting the wire rope to move within the reel.
(3) Fixed foundation: the pit depth is 600mm, concrete is poured on the ash soil, the surface is flat, and there are waterproof and ground protection measures.
II. Ground Safety Protection of Tower
Aluminum conductors and threaded steel shall not be used as grounding bodies or underground grounding lines for mounting towers. The wire to be bolted must have an end. Grounding mainly consists of the following three ways:
1. The ground body adopts a regular ground pile, or a steel pipe of 1.5 M with a length of 33 * 4.5, or a angle steel of 1.5 M with a length of 70 * 70.
2. The floor is made of steel plates, or other extensible metal plates, with an area of 1 square meter. The depth of 1.5 m from the ground.
3. Copper conductors with a cross section of not less than 28 mm or steel conductors with a cross section of not less than 50 mm are buried in the grooves, and the embedding length is determined by the grounding resistance.
In the above three methods, the cross-sectional area of the ground body leading out of the copper wire should not be less than 25. If the soil is poorly conductive, sodium chloride(salt) can be buried in the soil. Then pour the water. For walking tower hoists, each rail must be grounded, and wires should be connected between the two tracks. Electrical connections shall also be made between the two rails, and the grounding resistance shall not be greater than 4.
