Strand jack system
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A strand jack is a system similar to a jack, however in this case the load is not pushed up, but the jack pulls up a bundle of wires, which is called a strand. The system has two clamps: the bottom clamp is fixed and the upper clamp is connected to a hydraulic cylinder that can move up and down. Both clamps are gripping a steel wire. To start lifting the bottom clamp releases the wire and the top clamp is pushed up hydraulically whilst gripping the wire, which thus also moves up. Then the bottom clamp grips the wire, the top clamp is released and the hydraulic cylinder is retracted. Once fully retracted the top clamp grips the wire again and the bottom clamp is released. The load is lifted upwards by repetition of this sequence.