Device for roof support of underground mine/tunnel

Patent metadata

Field	Value
Publication number	US-9267375-B2
Application number	US-201113579631-A
Country	US
Kind code	B2
Filing date	Jan 31, 2011
Priority date	Feb 19, 2010
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

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.

First claim

We claim:

1. 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.

2. The device as claimed in claim 1 , wherein the detachable holding clamp and the long handle is having a matching internal threading with the external threads on the bottom portion of the top tubular element.

3. The device as claimed in claim 1 , wherein the top load setting clamp and the lock nut is having a matching internal threading with the external threads of the top tubular element.

4. The device as claimed in claim 3 , wherein the external and internal threading is of the same matching pitch.

5. The device as claimed in claim 1 , wherein the disc spring can be rearranged to vary the yielding range and capacity of the device as per requirement.

6. The device as claimed in claim 1 , wherein the disc spring is used to provide longevity to the device.

7. The device as claimed in claim 1 , wherein the device has quick release mechanism from a safe distance.

8. The device as claimed in claim 1 , wherein the load setting clamp and the lock nut have a matching internal threading with external threads of the top tubular element; the lock nut is threaded onto the external threads of the top tubular element; and the top load setting clamp comprises two half-nuts with the internal threading that in use close onto the external threads of the top tubular element.

9. The device as claimed in claim 1 , wherein the detachable holding clamp is movable between a clamped position in which it engages the top tubular element and transmits the load from the lock nut to the bottom tubular element, and an open position in which it can be removed from the top tubular element; and wherein removing the detachable holding clamp permits the lock nut to drop into the bottom tubular element.

10. 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.

11. The device as claimed in claim 10 , wherein the detachable holding clamp and the long handle is having a matching internal threading with the external threads on the bottom portion of the top tubular element.

12. The device as claimed in claim 10 , wherein the detachable top load setting clamp and the lock nut is having a matching internal threading with the external threads of the top tubular element.

13. The device as claimed in claim 12 , wherein the external and internal threading is of the same matching pitch.

14. The device as claimed in claim 10 , wherein the disc spring can be rearranged to vary the yielding range and capacity of the device as per requirement.

15. The device as claimed in claim 10 , wherein the disc spring is used to provide longevity to the device.

16. The device as claimed in claim 10 , wherein the device has quick release mechanism from a safe distance.

17. 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.

Assignees

• Kashyap Sudhir Kumar
• Sinha Amalendu
• Council Scient Ind Res

Inventors

• Kashyap Sudhir Kumar
• Sinha Amalendu

Classifications

• E21D15/585

  by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important (hydraulic props in which the hydraulic part is important E21D15/44) · CPC title

• E21D15/581

  in which the props are pre- loaded (extensible elements at strut extremities E21D15/52) · CPC title

• E21D15/46 Primary

  with load-measuring devices; with alarm devices · CPC title

• E21D15/56

  Details of locks of telescopic props · CPC title