What do the five prohibitions of tower cranes mean?

Legal analysis: 1. During the operation of tower crane, it is forbidden to leave the construction site. 2. It is forbidden for tower crane drivers and signalmen to work after drinking. 3. It is forbidden for tower crane drivers and signalmen to work in shifts due to fatigue. 4. It is forbidden for the signalman to stand upstairs and direct the lifting operation downstairs. 5. Bucket, large formwork, reinforcing cage, etc. When used on site, the lifting lug shall be welded or welded with threaded steel bars, and lifting is prohibited.

Legal basis: "Safety Instructions for Bell Workers of Tower Cranes" In order to ensure the safe operation and personal safety of tower cranes, put an end to unsafe factors, especially to ensure that accidents do not occur in safe production, tower crane operators bear great responsibilities. In order to facilitate memory and comply with relevant regulations on hoisting, Safety Instructions are specially printed for tower crane drivers and signalmen to remember and abide by.

A, tower crane personnel to do "five no":

1, tower crane in the process of operation, it is forbidden to be hoisted beyond the scope of the construction site.

2. It is forbidden for tower crane drivers and bell men to work after drinking.

3. Tower crane drivers and bell men are forbidden to work in large shifts due to fatigue.

4. It is forbidden for the bell man to stand upstairs and direct the lifting operation downstairs.

5. It is forbidden to lift buckets, large templates, reinforcing cages, etc. Use on site, or weld lifting lugs with threaded steel bars.

Adhere to "five concessions" when the second tower crane is running.

In tower crane operation, when conditions exist at the same time, the principle of "five concessions" must be adhered to.

1, low tower to high tower

The back tower gives way to the first tower.

3, light tower to heavy tower

4. Move the tower and let the static tower.

5. The passenger building gives way to the main building.

Three Towers personnel achieve "seven musts"

1, the walkie-talkies used by tower crane drivers and signalmen must be dedicated to special planes. After the frequency is determined and locked, the user has no right to change the frequency.

2. The bell man must strictly implement the response system with the tower crane driver. That is, call the tower crane number first, and then send the tower crane action instruction after the driver answers.

3, bell man command station must be in the operating point. After lifting, the hook and objects must always be observed visually; In the process of tower crane turning arm, the tower crane driver must look around the working state of adjacent tower cranes, and the landing point of lifting objects should be appropriate.

4. The command language issued by the signalman must be accurate, short, complete and clear.

5, tower crane driver and bell man without the consent of the competent person in charge, shall not be handed over, succession must be handed over face to face.

6, tower crane driver and bell man must hold relevant certificates.

7. During lifting, when the physical ground is 30-50 cm, stop lifting. Before lifting, the lifted object must be thoroughly inspected and confirmed to be safe.

Four tower cranes and signalmen strictly implement the "Ten Don't Hoist"

1, command signal is unknown.

2. Oblique traction, oblique hanging and no hanging.

3. If the weight of the hoisted object is unclear or overloaded, and the sling does not meet the requirements, do not lift it.

4. The bulk items are not firmly bound or the materials are not hung when loading.

5. Some people on the hanging object don't hang it.

6, mechanical safety device failure or not hanging in spite of illness.

7. Don't hang the funerary objects.

8, the scene is dark, can't see the lifting point.

9, odds and ends of small materials without containers and edge objects directly contact the wire rope, no protective measures.

10, strong winds above category 5 will not be hoisted.

Five wire rope scrap standard

1. Broken wires: The number of broken wires of steel wire rope is twisted alternately in a lay length, reaching 10% of the total number of steel wires of steel wire rope. The twist in the same direction reaches 5% of the total number of wire ropes.

2. Corrosion and surface wear: When the surface steel wire of the wire rope is worn or corroded to more than 40% of the diameter of the surface steel wire.

The whole wire rope is broken.

4. The diameter of steel wire rope is reduced by 7- 10%.

5, wire rope in the following cases:

① wire rope flattening

(2) wire rope strand relaxation

③ The wire rope is wavy.

(4) wire rope kink

⑤ Wire rope bending

⑥ Steel wire rope shelling

⑦ The steel wires in the steel wire rope strands fly out.

Today, the wire rope core flew out.