| 摘要 |
This invention relates to a device [10,42,45,47] for tensioning elongated elements such as metal rods [52], rope [59] and the lik e and comprises an inflatable pressure vessel having two superimposed major wall components [12,14] which include an aperture [28] which passes through them and a valve [20] for filling the vessel with liquid under pressure to cause the vessel to be inflated in the axial direction of the aperture [28].
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