GB/T5976-2006 National Standard Forged Wire Rope Clips for Construction Tower Cranes

The wire rope clamp connection method commonly uses the clamp fixation method. The commonly used wire rope clamps include the saddle type, pressure plate type, and fist grip type. Among these, the saddle type has strong connection strength and is widely used; the pressure plate type is next, while the fist grip type, due to its lack of a base, easily damages the wire rope and has poor connection strength, so it is only used in secondary applications.

When using wire rope clamps, the following points should be noted:

a) When selecting a clamp, ensure that the inner clearance of the U-bolt is 1–3 mm larger than the diameter of the wire rope. If it is too large, the clamp connection will not be tight, which can easily lead to accidents.

b) When installing the clamp, the bolts must be tightened until the rope is compressed by 1/3 to 1/4 of its diameter. After the rope is under load, the clamp bolts should be tightened again to ensure the joint is secure and reliable [2].

c) The clamps should be arranged in the same direction, with the U-bolt part contacting the rope end and not the main rope. If the U-bolt contacts the main rope, the main rope may be compressed and prone to wire breakage under load.

d) To facilitate checking the reliability of the joint and detecting any slippage of the wire rope, an additional clamp can be installed about 500 mm behind the last clamp, with the rope end forming a "bend." In this way, if the wire rope at the joint slips, the "bend" will be straightened first, indicating that immediate measures should be taken.