US20140050538A1 - Prop - Google Patents

Prop Download PDF

Info

Publication number
US20140050538A1
US20140050538A1 US13/968,548 US201313968548A US2014050538A1 US 20140050538 A1 US20140050538 A1 US 20140050538A1 US 201313968548 A US201313968548 A US 201313968548A US 2014050538 A1 US2014050538 A1 US 2014050538A1
Authority
US
United States
Prior art keywords
tubular member
prop
interior
tubular
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/968,548
Other languages
English (en)
Inventor
Christian NISSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MINE SUPPORT PRODUCTS
MINE SUPPORT PRODUCTS Pty Ltd
Original Assignee
MINE SUPPORT PRODUCTS Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MINE SUPPORT PRODUCTS Pty Ltd filed Critical MINE SUPPORT PRODUCTS Pty Ltd
Assigned to MINE SUPPORT PRODUCTS reassignment MINE SUPPORT PRODUCTS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NISSEN, CHRISTIAN
Publication of US20140050538A1 publication Critical patent/US20140050538A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves

Definitions

  • This invention relates to a prop suitable for use, for example, in an underground excavation in order to provide support between a footwall and an opposed hanging wall.
  • a prop of the aforementioned kind can be constructed to withstand a substantial force e.g. of the order of 65 tons, before yielding commences.
  • certain mining applications call for the capability of a prop to be loaded to a higher level, e.g. of the order of 100 tons, before yielding takes place. This figure is not readily attainable, though, when the conical friction ring is used as a restraining and, ultimately, as a yielding, member.
  • An object of the present invention is to provide a prop which attempts to address the aforementioned requirement.
  • the invention provides a prop which includes a first tubular member with a closed first end and a flared mouth at an opposed, second end, a second tubular member which extends into the first tubular member, through the flared mouth, which has one end inside the first tubular member and an opposed end which is sealed, a one-way filler valve connected to one of the tubular members through which a pressurised fluid can be introduced, at least, into an interior of the first tubular member, a seal which acts between the tubular members and which permits outward telescopic movement of the second tubular member relative to the first tubular member as an interior of, at least, the first tubular member is pressurised, a component which is located in the flared mouth around the second tubular member and which is frictionally engaged with, at least, an outer surface of the second tubular member, and a pressure relief valve which allows fluid to escape at least from an interior of the first tubular member, when the pressure of the fluid reaches a predetermined value, as the second tubular member is telescopically moved into
  • the pressurized fluid may also be introduced into an interior of the second tubular member.
  • the seal may act between an outer surface of a part of the second tubular member which is positioned inside the first tubular member, and an opposing surface of the first tubular member.
  • fluid under pressure may be permitted to escape from an interior of the first tubular member into an interior of the second tubular member.
  • fluid may escape from the first tubular member into atmosphere, or from the first and the second tubular members into atmosphere.
  • the accompanying drawing illustrates a prop 10 according to the invention installed in an underground excavation 12 and positioned between a footwall 14 and a hanging wall 16 .
  • the prop includes a first elongate tubular member 20 with a lower end 22 which is sealed by means of a domed closure 24 .
  • An opposing second end 26 of the first tubular member has an open mouth 28 formed by a flared section 30 of the member.
  • a second tubular member 34 is telescopically engageable with the first tubular member.
  • the second member has a slightly smaller diameter than the first member to allow this type of interengagement.
  • An upper end of the second tubular member is sealed by means of a domed closure 36 .
  • a lower opposed end 38 of the second tubular member is, in one embodiment of the invention, closed and carries a seal 40 which is in intimate sealing contact with an inner surface 42 of the first tubular member.
  • a conically shaped friction ring 44 is positioned inside the flared mouth 28 surrounding an opposing surface of the second tubular member.
  • the ring carries formations, not shown, at least on its inner surface 46 which help the ring to engage frictionally with an outer surface 50 of the second tubular member.
  • a one-way filler valve 54 is attached at a suitable location to the first tubular member.
  • Pressurised fluid e.g. water, derived from a suitable source, not shown, is passed through the filler valve 54 using a suitable connection and an interior 56 of the second tubular member, up to the seal 40 , can thereby be filled with water and can be pressurised.
  • the tubular members With the prop in the orientation shown in the attached drawing, as the volume 56 is pressurised the tubular members are telescopically extended, moving, respectively, towards the footwall 14 and the hanging wall 16 . In this way the prop is placed under a predetermined compressive load. Subsequently the friction ring 44 is hammered using a suitable tool, not shown, deeper into the conical mouth to ensure that it is firmly wedged in position and is frictionally engaged with the outer surface 50 of the second tubular member.
  • the pressurised fluid (water) is retained inside the volume 56 .
  • a pressure relief valve 60 is attached to the first tubular member. This valve will only open and allow water to flow from the volume 56 to atmosphere when the pressure of the water is in excess of a predetermined minimum. In other words the pressurised water restrains the prop from yielding until the water pressure exceeds a pre-set maximum value. At this point yielding is controlled by the combined actions of the pressure relief valve 60 and of the friction ring 44 .
  • the pressure relief valve 60 is dispensed with and is replaced by a pressure relief valve 62 fixed to the closed end 38 of the second tubular member.
  • the yielding action is, however, similar to what has been described but, in this event, once yielding commences, pressurised water is displaced from the volume 56 through the valve 62 into an interior 66 of the second tubular member.
  • neither of the valves 60 and 62 is used. Instead a pressure relief valve 64 is attached to a wall of the second tubular member. Additionally, an interior 66 of the second tubular member is filled with pressurised water at the same time as the first tubular member is pressurised. In other words a full interior of the prop contains pressurised water and thereby is pressurised. For this to occur a flow passage which permits free water flow is provided at the end 38 of the second tubular member. The seal 40 would then, for example, fit between an outer surface of the second tubular member, which is inside the first tubular member, and an opposed inner surface of the first tubular member.
  • the two tubular members, included in the prop can be made physically strong enough to withstand substantial loads.
  • the prop can also be engineered, in respect of its slenderness ratio, so that it does not buckle when subjected to a high load.
  • a yielding characteristic which is produced at a high load is, however, controlled by the combined action of the release of the pressurised water from inside the prop via the pressure relief valve 64 and by the mechanical/friction action of the ring 44 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Damping Devices (AREA)
  • Sealing Devices (AREA)
  • Multiple-Way Valves (AREA)
US13/968,548 2012-08-17 2013-08-16 Prop Abandoned US20140050538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2012/06199 2012-08-17
ZA201206199 2012-08-17

Publications (1)

Publication Number Publication Date
US20140050538A1 true US20140050538A1 (en) 2014-02-20

Family

ID=48782895

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/968,548 Abandoned US20140050538A1 (en) 2012-08-17 2013-08-16 Prop

Country Status (3)

Country Link
US (1) US20140050538A1 (fr)
EP (1) EP2698500A3 (fr)
AU (1) AU2013206571A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109057837A (zh) * 2018-09-18 2018-12-21 安徽宝龙电器有限公司 一种基于自动监测系统的自适应液压支柱系统
CN113006837A (zh) * 2021-02-03 2021-06-22 陕西陕煤韩城矿业有限公司 模块式单体液压支柱

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103912294B (zh) * 2014-03-19 2016-05-18 北京天地玛珂电液控制系统有限公司 一种使用光纤的工作面液压支架组直线度控制方法
CN107905825A (zh) * 2017-10-31 2018-04-13 山东里能鲁西矿业有限公司 一种新型用于无煤柱开采及防冲让压支柱

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1765200A (en) * 1927-11-17 1930-06-17 Bullough Enoch Pit prop
US2474464A (en) * 1947-04-24 1949-06-28 Cable Richard George Pit prop and the like
SU1735592A1 (ru) * 1986-11-27 1992-05-23 Институт Горного Дела Со Ан Ссср Гидравлическа стойка
US5720581A (en) * 1993-05-07 1998-02-24 Dorbyl Limited Support prop

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281107A (en) * 1965-12-15 1966-10-25 Ohio Brass Co Hydraulic support prop
ZA956530B (en) 1994-05-05 1996-05-23 Advanced Mining Software Ltd Prop
DE19514137C2 (de) * 1995-04-20 1997-02-13 Theodor Kolk Ausbaustütze für den untertägigen Berg- oder Tunnelbau
ZA996333B (en) * 1998-09-25 2000-04-10 Mine Support Products Propriet Support.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1765200A (en) * 1927-11-17 1930-06-17 Bullough Enoch Pit prop
US2474464A (en) * 1947-04-24 1949-06-28 Cable Richard George Pit prop and the like
SU1735592A1 (ru) * 1986-11-27 1992-05-23 Институт Горного Дела Со Ан Ссср Гидравлическа стойка
US5720581A (en) * 1993-05-07 1998-02-24 Dorbyl Limited Support prop

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109057837A (zh) * 2018-09-18 2018-12-21 安徽宝龙电器有限公司 一种基于自动监测系统的自适应液压支柱系统
CN113006837A (zh) * 2021-02-03 2021-06-22 陕西陕煤韩城矿业有限公司 模块式单体液压支柱

Also Published As

Publication number Publication date
EP2698500A2 (fr) 2014-02-19
EP2698500A3 (fr) 2017-06-21
AU2013206571A1 (en) 2014-03-06

Similar Documents

Publication Publication Date Title
US20140050538A1 (en) Prop
CA2986639A1 (fr) Systeme de distribution de coulis de ciment
CA2803714C (fr) Systeme de fracturation
US20170184434A1 (en) Breather tube indicator
AU2012200555A1 (en) Sliding anchor
US20150267822A1 (en) Valve
CN108868825A (zh) 高压大涌水量钻孔快速封堵方法
BR102015029620A2 (pt) válvula para controlar um fluxo de fluido, conjunto de barreira e método para a operação de uma válvula de elevação de gás
CN207813560U (zh) 煤层水力膨胀式封孔器
GB2467871A (en) Lining support for underground mining and tunneling
CN206571513U (zh) 一种让压机构
CA3132650C (fr) Support de toit de mine, son ensemble de pre-installation et procede d'installation
CN213233433U (zh) 一体化囊式扩大头锚杆
CN204284065U (zh) 密封锁紧液压油缸
RU2623612C2 (ru) Ограничитель скорости движения тела
CN206571509U (zh) 快速注充氮气的氮气安全阀
CN207195344U (zh) 一种具有溢流作用的液压油缸
CN206830210U (zh) 可调高钢管砼支柱
CN206668320U (zh) 一种采空区注浆充填处理止浆塞装置
US8549986B2 (en) Energy storage device, actuator and method
CN108798592B (zh) 一种石油井下用漂浮式开关转换装置
RU122432U1 (ru) Пакерное устройство для глубоких скважин с высоким пластовым давлением
CN106703852A (zh) 一种让压机构
CN207177945U (zh) 一种锚索液压恒阻器及液压恒阻锚索系统
CN213597917U (zh) 一种煤矿井下钻孔孔口控压装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: MINE SUPPORT PRODUCTS, SOUTH AFRICA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NISSEN, CHRISTIAN;REEL/FRAME:031024/0206

Effective date: 20130528

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION