Specification requirements for the number, spacing and direction of wire rope clamps

Main application scenarios on the construction site: hoisting machinery lifting rope, section steel cantilever unloading wire rope, cantilever operation platform, etc. How are the diameter of steel wire rope, the number, spacing and direction of rope clamps specified in different application parts?

1、 Section steel cantilever scaffold

Description of relevant articles in article 6.10 of safety technical code for fastener type steel pipe scaffold in building construction (jgj130-2011):

Clear: the unloading of steel wire rope is the structural requirement, the nominal diameter shall not be less than 14, and the number of rope clamps shall not be less than 3.

Note: in case of special circumstances and large frame load, it is necessary to consider the participation of steel wire rope in stress calculation. The nominal diameter of steel wire rope and the number of rope clamps shall be determined according to the calculation and look-up table.

2、 Cantilever operation platform

Article 6.4.7 of technical code for safety of high altitude operation in building construction (jgj80-2016):

Appendix C and relevant provisions:

Clear: the nominal diameter of the steel wire rope shall be determined according to the calculation, and the rope clamp shall match the diameter of the steel wire rope. And the number of rope clamps shall not be less than 4.

3、 Tower crane

Article 6.2 of safety technical specification for installation, use and disassembly of tower crane in building construction (jgj196-2010):

So, how many rope clamps does the steel wire rope need? What is the principle of rope clamp spacing and direction? Here: "steel wire rope clamp" (gb5976-2006), which is the most fundamental basis.

Conclusion:

1. The number of rope clamps matches the nominal diameter of the steel wire rope. There are no less than 3 steel wire rope clamps for the section steel pick-up frame because the diameter of the steel wire rope for the pick-up frame is not less than 14 (generally 14) and 18 according to the structure. The calculated nominal diameter of steel wire rope of cantilever operation platform is generally greater than 18, so there are no less than 4 rope clamps. The final actual number of rope clamps can be checked in the above table according to the diameter.

2. Rope clamp spacing: generally 6 ~ 7 times the nominal diameter of steel wire rope;

3. Direction of the rope clamp: the U-shaped bolt of the rope clamp is fastened at the tail section of the steel wire rope (i.e. the end of the rope), and the clamp seat is in the working section. All rope clamps shall be in the same direction and shall not be staggered.