Importance

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Abstract

A hydraulic prop 1 is provided for use in underground mining and tunnel construction and is to be used above all in the shield support. In this shield support or in the hydraulic prop 1, the exterior pipe 15 having the foot connection part 16 and the handle 17 and the interior pipe 19 having the head plate 20 are effectively connected together via spring steel wire ties 35 which are disposed or are to be disposed in corresponding connecting grooves 36, 37, 38 or 39, 40 41 such that in the transition region 42 sufficiently high forces can be transferred so as to ensure a connection between the components which is effective and remains effective. A setting pressure of 600 t can be realized at about 700 bar with the corresponding equipment. The connecting technique permits the use of high-strength thinner-walled pipes.

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First Claim