CN209908539U - Artificial ore pillar for underground support - Google Patents
Artificial ore pillar for underground support Download PDFInfo
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- CN209908539U CN209908539U CN201920537792.4U CN201920537792U CN209908539U CN 209908539 U CN209908539 U CN 209908539U CN 201920537792 U CN201920537792 U CN 201920537792U CN 209908539 U CN209908539 U CN 209908539U
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Abstract
The utility model provides an underground support uses artifical pillar, is including connecing a steel sheet, prestressing force application mechanism and pegging graft the support post between the two, and the support post comprises two support steel pipes that cup joint, and prestressing force application mechanism includes prestressing force application cylinder and the base/the supporting steel plate that has the direction cylinder, and base/supporting steel plate is through direction cylinder cladding prestressing force application cylinder, and prestressing force application cylinder is inside to be used for filling expanding material. The method for erecting the artificial ore pillar comprises the following steps: firstly, placing a prestress applying mechanism filled with an expansion material on a bottom plate at a supporting position, then inserting a supporting upright post outer pipe into a supporting steel plate, and then inserting a top-contacting steel plate into the top end of the supporting upright post inner pipe; a hoop is fixedly installed on the outer pipe of the support upright post, and the hoop is loosely sleeved on the inner pipe; lifting the inner pipe of the support upright upwards to enable the top-contacting steel plate to be in contact with the top plate; fastening inner pipe hoops, placing a jack between the two hoops, applying a pre-tightening supporting force, and welding the inner pipe and the outer pipe at the same time; the prestress applying cylinder barrel injects water and outputs expansion force.
Description
Technical Field
The utility model belongs to the technical field of mining engineering, especially, relate to an underground struts uses artifical ore pillar.
Background
When horizontal and gentle slope metal deposits of underground mines are mined, in order to ensure the operation safety conditions of personnel, wider continuous mining area ore pillars and discontinuous round or rectangular point pillars are usually reserved for bearing overlying strata loads at the upper part of a mining area range, so that the deformation and the damage of a roof are limited, the stability of a stope is ensured, and the allowable span of stope stoping is controlled.
Although virgin pillars improve the safety of the stope, it is inevitable that economic efficiency is reduced if the remaining pillars are not recovered at the end of production. Currently, the most common method of recovering residual pillars is direct weakening blasting and replacement with artificial pillars. The installation of the artificial pillars can improve the safety of the stope compared to a direct weakening blasting method, because the roof is already supported by the artificial pillars before the recovery of the primary pillars.
Artificial pillars can be classified into brittle pillars, perfect elastoplastic pillars, strain-softened pillars, and strain-hardened pillars, according to their load-bearing and deformation characteristics. At present, three types of artificial ore pillars are widely applied to the mining industry, and a strain hardening ore pillar which is one of yielding support systems is still in the research and development stage.
Besides optimizing the load-displacement curve of the artificial ore pillar, the actual acting time of the supporting body is also a key factor influencing the supporting effect. As is known, before the artificial pillar support is erected, the roof panel will be deformed in a certain early stage due to the influence of mining in the stope, and at the same time, a certain gap is usually formed between the top of the artificial pillar and the roof panel in the stope, so that the roof panel is necessarily deformed further before the artificial pillar actually starts to bear the load of the roof panel. In order to solve this problem and provide support as early as possible, the construction time of the artificial pillar must be reduced. However, for a particular supporting structure, the construction cycle is fixed, for example it takes at least 7 days to build and maintain a conventional concrete pillar. Therefore, development of a new supporting technology that can shorten the construction period is urgently required.
Another more effective way of providing support to the roof of the stope earlier is to change "passive support" to "active support" which can quickly provide pre-stress to eliminate the gap between the roof and the supports and limit roof deformation earlier. Currently, there are five types of prestressed support systems on the market, including wooden wedges, mechanical devices, inflated rubber bladders, grout filled bags and water-inflated steel diaphragms, but these five types of prestressed support systems have a common disadvantage of low active support forces, which are only in the range of about 20kN to 800 kN.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a strut in pit and use artifical pillar can shorten the construction time of artifical pillar to within several hours, can realize simultaneously that the initiative of roof supports and should harden and bear.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an artificial ore pillar for underground support comprises a top-contacting steel plate, a support upright post and a prestress applying mechanism; the top steel plate upper surface that connects contacts with the roof, and the support post top links to each other with connecting the steel plate lower surface grafting, and the support post bottom links to each other with prestressing force applying mechanism top grafting, and prestressing force applying mechanism places on the bottom plate.
The number of the supporting stand columns is 5-7, and the supporting stand columns are uniformly distributed between the top-contacting steel plate and the prestress applying mechanism.
The lower surface of the top-connected steel plate is welded with a top plate side inserting sleeve, the upper end of the prestress applying mechanism is fixedly provided with a bottom plate side inserting sleeve, the top end of the supporting upright post is in inserting fit with the top plate side inserting sleeve, and the bottom end of the supporting upright post is in inserting fit with the bottom plate side inserting sleeve.
The supporting upright columns comprise top plate side supporting steel pipes and bottom plate side supporting steel pipes, the bottom plate side supporting steel pipes are sleeved outside the top plate side supporting steel pipes, the length of the pipe bodies of the bottom plate side supporting steel pipes is smaller than that of the top plate side supporting steel pipes, and the top plate side supporting steel pipes and the bottom plate side supporting steel pipes are in clearance fit; the top end of the top plate side supporting steel pipe is inserted in the top plate side inserting sleeve, and the bottom end of the bottom plate side supporting steel pipe is inserted in the bottom plate side inserting sleeve.
The prestress applying mechanism comprises a base steel plate, a supporting steel plate, a bottom plate side guide steel cylinder, a top plate side guide steel cylinder and a prestress applying steel cylinder; the lower surface of the base steel plate is in contact with the bottom plate, and the bottom plate side guide steel cylinder is welded on the upper surface of the base steel plate; the supporting steel plate is positioned right above the base steel plate, the top plate side guide steel cylinder is welded on the lower surface of the supporting steel plate, and the top plate side guide steel cylinder and the bottom plate side guide steel cylinder are concentrically arranged; the lower half part of the prestress applying steel cylinder is positioned in the bottom plate side guide steel cylinder, and the upper half part of the prestress applying steel cylinder is positioned in the top plate side guide steel cylinder; the bottom plate side insertion sleeve is welded on the upper surface of the support steel plate.
The axial height of the prestress applying steel cylinder is equal to the sum of the axial heights of the bottom plate side guide steel cylinder and the top plate side guide steel cylinder.
The interior of the prestress applying steel cylinder is divided into a plurality of independent chambers by partition plates, expansion materials are placed in each independent chamber, a water injection port and an exhaust hole are formed in a supporting steel plate above each independent chamber, and a drain hole is formed in the wall of the bottom plate side guide steel cylinder corresponding to the side of each independent chamber; every water injection mouth department all welds and has connected, is equipped with the screw plug on the water injection connects.
The method for erecting the artificial ore pillar for the underground support comprises the following steps:
the method comprises the following steps: determining a supporting position, and placing the base steel plate welded with the bottom plate side guide steel cylinder on a bottom plate at the supporting position;
step two: placing a prestress applying steel cylinder into the bottom plate side guide steel cylinder, and filling an expansion material in each independent cavity;
step three: placing the supporting steel plate welded with the top plate side guide steel cylinder above the bottom plate side guide steel cylinder, and accurately sleeving the top plate side guide steel cylinder on the prestress applying steel cylinder;
step four: inserting a top plate side supporting steel pipe into the bottom plate side supporting steel pipe to form two stages of telescopic supporting upright columns, and completing the assembly of all the supporting upright columns in sequence;
step five: inserting the bottom ends of the bottom plate side supporting steel pipes of the supporting stand columns into the bottom plate side inserting sleeve, and sequentially completing the insertion of all the supporting stand columns;
step six: placing the top-contacting steel plate on the top ends of the supporting stand columns, and accurately inserting the top ends of the top plate side supporting steel pipes of all the supporting stand columns into the top plate side inserting sleeve at the corresponding position;
step seven: installing an upper bottom plate side hoop at the top end pipe orifice of the bottom plate side support steel pipe, and locking and fixing the bottom plate side hoop on the bottom plate side support steel pipe; meanwhile, an upper top plate side hoop is installed on the top plate side support steel pipe, the top plate side hoop is kept in a loose state, and the top plate side hoop is freely placed on the bottom plate side hoop;
step eight: the steel pipe is supported by the side of the top plate by manually lifting the top plate until the top-contacting steel plate is in abutting contact with the top plate;
step nine: moving the top plate side clamp to be above the top end pipe orifice of the bottom plate side support steel pipe, and locking and fixing the top plate side clamp on the top plate side support steel pipe;
step ten: a pair of jacks is vertically arranged between the bottom plate side hoop and the top plate side hoop, and axial pre-tightening supporting force is applied to the supporting upright column through the jacks;
step eleven: the jack provides axial pre-tightening supporting force, the top plate side supporting steel pipe and the bottom plate side supporting steel pipe are welded and fixedly connected together at the interface of the two pipes, and then the jack, the bottom plate side hoop and the top plate side hoop are removed from the supporting upright post; finally, the pre-tightening force application of all the supporting stand columns is completed in sequence;
step twelve: and (4) dismounting the threaded plugs on all the water injection joints, injecting water into the expansion material in the independent cavity through the water injection joints, enabling the expansion material to expand when encountering water, outputting expansion force along the axial direction, and finally converting the expansion force into supporting force between the top plate and the bottom plate.
When the selection is processed the slip casting hole on roof side grafting sleeve and roof side support steel pipe grafting department pipe wall, pour into cement mortar into in to the support post through the slip casting hole, convert the support post into steel pipe concrete structure by hollow structure for promote the intensity of support post, and make the bulk strength of artifical pillar obtain improving.
The utility model has the advantages that:
the utility model discloses an underground supporting uses artifical pillar can shorten the build time of artifical pillar to within several hours, can realize simultaneously that the initiative of roof supports and should harden and bear, can provide the initiative prestressing force more than 10MPa for the roof. The utility model discloses an artificial pillar can be regarded as one kind "just-gentle" coupling structure, after the roof warp and pressure release, the utility model discloses an artificial pillar bears the characteristic through its strain hardening that has, and realization that can be better is strutted to "letting the pressure" of roof to effectively restrict the deformation and the destruction of roof, and then improve the safe operating condition in stope, is showing the economic benefits who improves the mine simultaneously.
Drawings
FIG. 1 is a perspective view of an artificial pillar for underground support according to the present invention;
FIG. 2 is a front view of an artificial pillar for underground support according to the present invention;
fig. 3 is an exploded view of the prestressing mechanism according to the present invention;
FIG. 4 is a schematic diagram of the support column being pre-tensioned;
FIG. 5 is a schematic diagram of the position of the grouting hole opening of the support column under the strength improvement scheme;
in the figure, 1-top steel plate, 2-supporting upright post, 3-prestress applying mechanism, 4-top plate side inserting sleeve, 5-bottom plate side inserting sleeve, 6-top plate side supporting steel pipe, 7-bottom plate side supporting steel pipe, 8-base steel plate, 9-supporting steel plate, 10-bottom plate side guiding steel cylinder, 11-top plate side guiding steel cylinder, 12-prestress applying steel cylinder, 13-partition plate, 14-independent chamber, 15-exhaust hole, 16-exhaust hole, 17-water injection joint, 18-thread plug, 19-bottom plate side clamp, 20-top plate side clamp, 21-jack, 22-grouting hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, an artificial pillar for underground support comprises a top steel plate 1, a support column 2 and a prestress applying mechanism 3; the top surface of the top-contacting steel plate 1 is contacted with the top plate, the top ends of the supporting upright posts 2 are connected with the lower surface of the top-contacting steel plate 1 in an inserting manner, the bottom ends of the supporting upright posts 2 are connected with the top end of the prestress applying mechanism 3 in an inserting manner, and the prestress applying mechanism 3 is placed on the bottom plate.
The number of the supporting columns 2 is 5-7, and the supporting columns 2 are uniformly distributed between the top-contacting steel plate 1 and the prestress applying mechanism 3.
The lower surface of the top-contacting steel plate 1 is welded with a top plate side inserting sleeve 4, the upper end of the prestress applying mechanism 3 is fixedly provided with a bottom plate side inserting sleeve 5, the top end of the supporting upright post 2 is in inserting fit with the top plate side inserting sleeve 4, and the bottom end of the supporting upright post 2 is in inserting fit with the bottom plate side inserting sleeve 5.
The supporting upright post 2 comprises a top plate side supporting steel pipe 6 and a bottom plate side supporting steel pipe 7, the bottom plate side supporting steel pipe 7 is sleeved outside the top plate side supporting steel pipe 6, the length of the bottom plate side supporting steel pipe 7 is smaller than that of the top plate side supporting steel pipe 6, and the top plate side supporting steel pipe 6 is in clearance fit with the bottom plate side supporting steel pipe 7; the top end of the top plate side supporting steel pipe 6 is inserted into the top plate side inserting sleeve 4, and the bottom end of the bottom plate side supporting steel pipe 7 is inserted into the bottom plate side inserting sleeve 5.
The prestress applying mechanism 3 comprises a base steel plate 8, a supporting steel plate 9, a bottom plate side guide steel cylinder 10, a top plate side guide steel cylinder 11 and a prestress applying steel cylinder 12; the lower surface of the base steel plate 8 is in contact with the bottom plate, and the bottom plate side guide steel cylinder 10 is welded on the upper surface of the base steel plate 8; the supporting steel plate 9 is positioned right above the base steel plate 8, the top plate side guide steel cylinder 11 is welded on the lower surface of the supporting steel plate 9, and the top plate side guide steel cylinder 11 and the bottom plate side guide steel cylinder 10 are arranged concentrically; the lower half part of the prestress application steel cylinder 12 is positioned in the bottom plate side guide steel cylinder 10, and the upper half part of the prestress application steel cylinder 12 is positioned in the top plate side guide steel cylinder 11; the bottom plate side plug-in sleeve 5 is welded on the upper surface of the support steel plate 9.
The axial height of the prestress application steel cylinder 12 is equal to the sum of the axial heights of the bottom plate side guide steel cylinder 10 and the top plate side guide steel cylinder 11.
The interior of the prestress applying steel cylinder 12 is divided into a plurality of independent chambers 14 through partition plates 13, expansion materials are placed in each independent chamber 14, a water injection port and an exhaust hole 15 are formed in the supporting steel plate 9 above each independent chamber 14, and a drain hole 16 is formed in the wall of the bottom plate side guide steel cylinder 10 corresponding to the side of each independent chamber 14; each water injection port is welded with a water injection joint 17, and the water injection joint 17 is provided with a threaded plug 18.
The method for erecting the artificial ore pillar for the underground support comprises the following steps:
the method comprises the following steps: determining a supporting position, and placing the base steel plate 8 welded with the bottom plate side guide steel cylinder 10 on a bottom plate at the supporting position;
step two: placing a prestress applying steel cylinder 12 into the floor side guide steel cylinder 10 and filling each independent chamber 14 with an expansion material;
step three: placing the supporting steel plate 9 welded with the top plate side guide steel cylinder 11 above the bottom plate side guide steel cylinder 10, and accurately sleeving the top plate side guide steel cylinder 11 on the prestress application steel cylinder 12;
step four: inserting a top plate side supporting steel pipe 6 into the bottom plate side supporting steel pipe 7 to form a two-stage telescopic supporting upright post 2, and completing the assembly of all the supporting upright posts 2 in sequence;
step five: inserting the bottom ends of the bottom plate side supporting steel pipes 7 of the supporting upright columns 2 into the bottom plate side inserting sleeves 5, and sequentially completing the insertion of all the supporting upright columns 2;
step six: placing the top-contacting steel plate 1 on the top ends of the supporting upright columns 2, and accurately inserting the top ends of the top plate side supporting steel pipes 6 of all the supporting upright columns 2 into the top plate side inserting sleeve pipes 4 at corresponding positions;
step seven: installing an upper bottom plate side hoop 19 at the top end pipe orifice of the bottom plate side support steel pipe 7, and locking and fixing the bottom plate side hoop 19 on the bottom plate side support steel pipe 7; meanwhile, an upper deck side clamp 20 is mounted on the deck side support steel pipe 6, the deck side clamp 20 is kept in a loosened state, and the deck side clamp 20 is freely dropped on the floor side clamp 19;
step eight: the steel pipe 6 is supported by the side of the top plate by manually lifting the top plate until the top-contacting steel plate 1 is in abutting contact with the top plate;
step nine: moving the top plate side hoop 20 above the top end pipe orifice of the bottom plate side support steel pipe 7, and locking and fixing the top plate side hoop 20 on the top plate side support steel pipe 6;
step ten: a pair of jacks 21 are vertically arranged between the bottom plate side hoop 19 and the top plate side hoop 20, and axial pre-tightening supporting force is applied to the supporting upright post 2 through the jacks 21, as shown in fig. 4;
step eleven: the jack 21 provides axial pre-tightening supporting force, the top plate side supporting steel pipe 6 and the bottom plate side supporting steel pipe 7 are welded and fixedly connected together at the interface of the two pipes, and then the jack 21, the bottom plate side hoop 19 and the top plate side hoop 20 are removed from the supporting upright post 2; finally, the pre-tightening force application of all the supporting upright columns 2 is completed in sequence;
step twelve: the threaded plugs 18 on all the water injection joints 17 are removed, the expansion material in the independent chamber 14 is injected with water through the water injection joints 17, the expansion material expands when encountering water, and the expansion force is output along the axial direction and finally converted into the supporting force between the top plate and the bottom plate.
As shown in fig. 5, when the grouting holes 22 are processed on the pipe wall at the splicing position of the top plate side splicing sleeve 4 and the top plate side support steel pipe 6, cement mortar is injected into the support column 2 through the grouting holes 22, the support column 2 is converted into a steel pipe concrete structure from a hollow structure, the strength of the support column 2 is improved, and the overall strength of the artificial ore pillar is improved.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides an underground support uses artifical ore pillar which characterized in that: comprises a top-contacting steel plate, a supporting upright post and a prestress applying mechanism; the top steel plate upper surface that connects contacts with the roof, and the support post top links to each other with connecting the steel plate lower surface grafting, and the support post bottom links to each other with prestressing force applying mechanism top grafting, and prestressing force applying mechanism places on the bottom plate.
2. The artificial ore column for underground support according to claim 1, wherein: the number of the supporting stand columns is 5-7, and the supporting stand columns are uniformly distributed between the top-contacting steel plate and the prestress applying mechanism.
3. The artificial ore column for underground support according to claim 1, wherein: the lower surface of the top-connected steel plate is welded with a top plate side inserting sleeve, the upper end of the prestress applying mechanism is fixedly provided with a bottom plate side inserting sleeve, the top end of the supporting upright post is in inserting fit with the top plate side inserting sleeve, and the bottom end of the supporting upright post is in inserting fit with the bottom plate side inserting sleeve.
4. The artificial ore column for underground support according to claim 3, wherein: the supporting upright columns comprise top plate side supporting steel pipes and bottom plate side supporting steel pipes, the bottom plate side supporting steel pipes are sleeved outside the top plate side supporting steel pipes, the length of the pipe bodies of the bottom plate side supporting steel pipes is smaller than that of the top plate side supporting steel pipes, and the top plate side supporting steel pipes and the bottom plate side supporting steel pipes are in clearance fit; the top end of the top plate side supporting steel pipe is inserted in the top plate side inserting sleeve, and the bottom end of the bottom plate side supporting steel pipe is inserted in the bottom plate side inserting sleeve.
5. The artificial ore column for underground support according to claim 3, wherein: the prestress applying mechanism comprises a base steel plate, a supporting steel plate, a bottom plate side guide steel cylinder, a top plate side guide steel cylinder and a prestress applying steel cylinder; the lower surface of the base steel plate is in contact with the bottom plate, and the bottom plate side guide steel cylinder is welded on the upper surface of the base steel plate; the supporting steel plate is positioned right above the base steel plate, the top plate side guide steel cylinder is welded on the lower surface of the supporting steel plate, and the top plate side guide steel cylinder and the bottom plate side guide steel cylinder are concentrically arranged; the lower half part of the prestress applying steel cylinder is positioned in the bottom plate side guide steel cylinder, and the upper half part of the prestress applying steel cylinder is positioned in the top plate side guide steel cylinder; the bottom plate side insertion sleeve is welded on the upper surface of the support steel plate.
6. The artificial ore column for underground support according to claim 5, wherein: the axial height of the prestress applying steel cylinder is equal to the sum of the axial heights of the bottom plate side guide steel cylinder and the top plate side guide steel cylinder.
7. The artificial ore column for underground support according to claim 5, wherein: the interior of the prestress applying steel cylinder is divided into a plurality of independent chambers by partition plates, expansion materials are placed in each independent chamber, a water injection port and an exhaust hole are formed in a supporting steel plate above each independent chamber, and a drain hole is formed in the wall of the bottom plate side guide steel cylinder corresponding to the side of each independent chamber; every water injection mouth department all welds and has connected, is equipped with the screw plug on the water injection connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920537792.4U CN209908539U (en) | 2019-04-18 | 2019-04-18 | Artificial ore pillar for underground support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920537792.4U CN209908539U (en) | 2019-04-18 | 2019-04-18 | Artificial ore pillar for underground support |
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| CN209908539U true CN209908539U (en) | 2020-01-07 |
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| CN201920537792.4U Active CN209908539U (en) | 2019-04-18 | 2019-04-18 | Artificial ore pillar for underground support |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944615A (en) * | 2019-04-18 | 2019-06-28 | 东北大学 | A kind of underground supporting manually ore pillar and erection method |
| CN111852476A (en) * | 2020-07-21 | 2020-10-30 | 东北大学 | Deep gentle dip thin vein pillar-free continuous mining method |
-
2019
- 2019-04-18 CN CN201920537792.4U patent/CN209908539U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944615A (en) * | 2019-04-18 | 2019-06-28 | 东北大学 | A kind of underground supporting manually ore pillar and erection method |
| CN111852476A (en) * | 2020-07-21 | 2020-10-30 | 东北大学 | Deep gentle dip thin vein pillar-free continuous mining method |
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