This top not only has all the functions of ordinary jacks, but also has a unique hollow piston design, allowing solid rods or steel ropes to pass through, providing tensile force, and optional steel piston saddles can also be used as ordinary tops, especially suitable for post tensioning Method and pre-pull method work. Single-acting hollow plunger jacks are suitable for tension testing and maintenance of cables, anchor bolts, and stress screws, as well as applications that require tension.
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