Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1995-03-15
1997-03-18
Bagnell, David J.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
91170MP, 91432, 137522, 251 634, E21D 1544
Patent
active
056116462
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a support prop for underground mining use in longwall and gallery with telescopic external and internal prop, and connected with the latter a crown head, collar ring and sole plate, as well as a pressure limiting valve integrated into the prop head and a filling and drawing valve positioned on the internal prop.
In underground mining and in tunnel construction support props, also called individual props, are used to secure cavities which were created by mining. Known support props are constructed as single or multiple telescope props and are preferably operated with a water-in-oil emulsion. This emulsion is pumped via pumps located outside the longwall or at some distance from the respective operating site by way of suitable hose lines to the respective support prop. The inside of the support prop is then connected by way of so-called setting guns with the pump and is accordingly filled and extended, and in this way is clamped between the topwall and footwall. In the known support props the external and internal props with their different diameters are welded both to the crown head and to the collar ring and the sole plate. Because mostly improved pipes are used today, i.e. strain-hardened pipes, the structure is negatively affected or even destroyed when the crown head, collar ring and sole plate are welded on, whereby an exact testing of these modified properties is not possible. In addition, the filling and drawing valve used becomes relatively complicated, whereby this filling and drawing valve as a rule is attached to the internal prop from the outside and is coupled with the pressure limiting valve, in order to enable the coupling of the individual functions setting, drawing and protecting against overload in this manner with the integrated valve. These valves, particularly the pressure limiting valve, exhibit a relatively small flow volume, resulting thus in a too low insertion speed in cases of actual overloads. For this reason, high volume pressure limiting valves integrated in the prop head (DE-OS 40 35 874.7) have been created, in which relatively high volumes of up to 1,000 l per minute can be achieved. But the disadvantage here is that they still require the relatively complicated setting and drawing valve which is attached to the outside of the internal prop.
SUMMARY OF THE INVENTION
The invention is thus based on the task of designing a support prop consisting of strain-hardened pipes in such a way that the improvement is preserved during processing, and that a safe and quick setting and drawing with high insertion speed is ensured.
According to the invention the task is solved in that external prop, sole plate, internal prop and crown head are nailed, that the internal prop and the piston moving in the external prop are equipped with corresponding screw threads, and that the filling and drawing valve is constructed as a pilot controlled check valve with double setting gun connection.
With a support prop constructed in this manner, it is first advantageous to work with shear wires in order to connect the individual prop parts effectively and permanently with each other. These shear wires are inserted into appropriate bores or grooves, thus also reducing production expenditure. But the special advantage is that the pipe improvement is preserved, since the work is performed essentially without increased temperatures. Another advantage is that the already known separation of filling and drawing valve on the one side and the pressure limiting valve on the other side makes it possible to realize a pressure limiting valve with a very high flow volume. Due to the pressure to be set and the given conditions, insertion speeds of 3 meters per second and more can be achieved; for this reason such a valve can be considered suitable for rock bursts. And finally, the filling and drawing valve has been simplified so that the filling and drawing process is facilitated and, in particular, it is now possible to catch pressure medium released during draw
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"Grundlagen und Komponenten der Fluidtechnik Hydraulik", Der Hydraulik Trainer, Band 1, pp. 216-217 (undated).
Bagnell David J.
Creighton Wray James
Richard Voss Grubenausbau GmbH
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