US 8,297,888 B2Granted

Hydraulic prop comprising thin-walled exterior and interior pipes

OwnerWolfgang Vossinventor

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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.

Claims17

Dependent claims

A hydraulic prop for the use in underground mining and tunnel construction, having an exterior pipe (15) with an end-side foot connection part (16) as well as a handle (17) attached to the opposite pipe end, and having an interior pipe (19) which is designed to be displaceable in the exterior pipe (15) and has an end-side head plate (20) and an allocated filling/release valve (21), pressure-limiting valve (22) and lock wires (30) to be slid into connecting grooves (36) for the exterior pipe (15), foot connection part (16) and handle (17) as well as the interior pipe (19) and head plate (20), wherein the lock wires (30, 31, 32) are formed as rectangular wire ties (35) of spring steel, which are designed to be able to be placed in a connecting groove (36, 37, 38), corresponding in width to the wire ties (35), and to be able to be displaced from here into a transition region (42) and thus into an opposite connecting groove (39, 40, 41), corresponding in width to the wire ties, and to connect the pipes together at this location.

Dependencies are inferred from the claim text.