Pit prop with integrated pressure-relief valve and nailed pipes

Details Pit prop with integrated pressure-relief valve and nailed pipes Pit prop with integrated pressure-relief valve and nailed pipes

E - Fixed Constructions

21

D

E21D 15/51 (2006.01) E21D 15/44 (2006.01)

Patent

CA 2142467

A support prop having a very compact construction and a pressure limiting valve with high throughflow quantities, uses the prop head as valve housing, so that the pressure limiting valve advantageously can be integrated in the prop head. Pushing in speeds of above 3 metre per second can be achieved hereby and by the particular embodiment of the overall support prop. One, or if necessary two, releasable non-retum valves serve as withdrawal and setting valve, which, with little expense, can be applied on the outside at the inner prop and which allow a rapid setting and also withdrawal, in that a return of the release pressure medium is made possible. During withdrawal the release pressure medium flows by means of the connection of the releasable non-return valve designed as set pistol, and then can be led back into the circuit.

Dans un étançon de soutènement (1) très compact ayant une soupape de limitation de pression (15) à débit très élevé, on utilise la tête (11) de l'étançon comme corps (44) de soupape, de sorte que la soupape de limitation de pression (15) peut être avantageusement intégrée dans la tête (11) de l'étançon, ce qui permet d'atteindre des vitesses d'avancement supérieures à 3 m par seconde. Ces vitesses sont également possibles grâce à la conception spéciale de l'ensemble de l'étançon de soutènement (1). Une ou éventuellement deux soupapes anti-retour pilotées (51, 57) servent de soupapes d'enlèvement et de pose des étançons. Ces soupapes peuvent être montées facilement à l'extérieur de l'étançon intérieur (10) et permettent de poser et d'enlever rapidement les étançons, étant donné qu'elles permettent d'évacuer à nouveau le fluide hydraulique libéré. Le fluide hydraulique libéré pendant l'enlèvement des étançons s'écoule à travers le raccord de la soupape anti-retour pilotée (41), qui se présente avantageusement comme un raccord (42, 53) d'un pistolet de pose d'étançons, et peut être ramené dans le circuit de fluide hydraulique.

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