Device for roof support of underground mine/tunnel
AssigneeCouncil of Scientific and Industrial Research
InventorsSudhir Kumar Kashyap, Amalendu Sinha
Life of this patent
Estimating the term…
Abstract
The present invention provides a device useful for supporting underground mine/tunnels. The device continuously monitors the roof load coming over the canopy and correspondingly yielding/convergence indicated by the pointer on graduate scale. The roof load coming on the canopy (9) is transmitted to the prop via a set of steel disc springs (5) to increase the yielding and longevity of the present device. The present invention has mechanism for preloading upto the desired load. It is a simple, easily transportable and user friendly device having quick release mechanism from a safe distance.
Claims17
A device for roof support of underground mine/tunnel, comprising in combination a top tubular element being inserted telescopically in a bottom tubular element by means of a lock nut and a detachable top load setting clamp;
- wherein the top portion of the said top tubular element being attached to a spring holding element having a disc spring, a pointer being attached at the top of the said disc spring to indicate the load, a square section canopy being coaxially placed at the top of the said spring holding element to bear the load, a detachable holding clamp having remote release mechanism being provided at the bottom of the said top tubular element by means of a long handle and a detachable bottom load setting clamp being provided at the top of the said bottom tubular element;
- wherein twin jacks being provided between the top and bottom load setting clamps to lift the top load setting clamp so as to lift the top tubular element during the operation,
- wherein in use the lock nut rests on the detachable holding clamp and transmits load from the top tubular element to the detachable holding clamp, and the detachable holding clamp rests on the bottom tubular element and transmits load from the lock nut to the bottom tubular element.
A device for roof support of underground mine/tunnel, comprising in combination a top tubular element being inserted telescopically in a bottom tubular element by means of a lock nut and a detachable top load setting clamp;
- wherein the top portion of the said top tubular element being attached to a spring holding element having a disc spring, a pointer being attached at the top of the said disc spring to indicate the load, a square section canopy being coaxially placed at the top of the said spring holding element to bear the load, a detachable holding clamp having remote release mechanism being provided at the bottom of the said top tubular element by means of a long handle and a detachable bottom load setting clamp being provided at the top of the said bottom tubular element;
- wherein the detachable top load setting clamp in use engages the top tubular element above the lock nut and below the spring holding element, and wherein twin jacks are provided between the top and bottom load setting clamps so that upper ends of the twin jacks lift the top tubular element during the operation by lifting the detachable top load setting clamp, thereby compressing the disc spring.
A device for roof support of underground mine/tunnel, comprising in combination:
- a bottom tubular element;
- a detachable holding clamp supported on the bottom tubular element, the detachable holding clamp being movable between a clamped position around the top tubular element and a released position in which it can be removed from the top tubular element, and having a release mechanism operable remotely by a long handle;
- an internally threaded lock nut supported on the detachable holding clamp;
- an externally threaded top tubular element inserted telescopically in the bottom tubular element and threadingly engaged and supported by the lock nut;
- a spring holding element having a disc spring attached to a top portion of the top tubular element, wherein the disc spring can be rearranged to vary the yielding range and capacity of the device as per requirement;
- a pointer attached at the top of the disc spring to indicate a load on the device;
- a square section canopy coaxially placed at the top of the spring holding element to bear the load;
- an internally threaded detachable top load setting clamp that comprises two half-nuts with internal threading that during a setting operation is provided to close onto the external threads of the top tubular element between the lock nut and the spring holding element;
- a detachable bottom load setting clamp that during the setting operation is provided to engage the bottom tubular element;
- twin jacks that during the setting operation are provided to lift the detachable top load setting clamp so as to lift the top tubular element;
- wherein during the setting operation the lock nut is screwed down to rest on the detachable holding clamp;
- wherein after the setting operation the lock nut transmits load from the top tubular element to the detachable holding clamp, and the detachable holding clamp transmits load from the lock nut to the bottom tubular element, whereby after the setting operation the detachable top and bottom load setting clamps and the jacks can be removed;
- and
- wherein to release the detachable holding clamp, the detachable holding clamp is released from a safe distance using the long handle, permitting the lock nut and the top tubular element to drop into the bottom tubular element.
Dependencies are inferred from the claim text.