CN112030773B - Construction method for bridging between open pit coal mine stope and refuse dump - Google Patents
Construction method for bridging between open pit coal mine stope and refuse dump Download PDFInfo
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- CN112030773B CN112030773B CN202010978318.2A CN202010978318A CN112030773B CN 112030773 B CN112030773 B CN 112030773B CN 202010978318 A CN202010978318 A CN 202010978318A CN 112030773 B CN112030773 B CN 112030773B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a construction method for bridging between an open pit coal mine stope and a refuse dump, which comprises two parts of a refuse dump extension design and a bridging design; the extension design part of the refuse dump comprises the following steps: digging a mined-out area between a refuse dump and a mining field, wherein the height of the mined-out area is h, arranging a rock-soil transportation bridge body extending to the mining field at the refuse dump, arranging a passage between the rock-soil transportation bridge body and the mining field, and the width of the passage is b; (II) setting a step slope angle of a stope as alpha; setting a natural repose angle between the rock-soil transport bridge body and the ground as beta; and thirdly, along with the mining of the steps of the stope, the rock-soil transportation bridge body is lengthened to be equal to the mining length of the steps of the stope. The problem of secondary stripping is completely avoided by utilizing the combination mode of the rock-soil bridge body and the steel truss bridge, and meanwhile, the device is simple in structure, short in transportation distance and convenient to disassemble and assemble. The bottom of the bridge body is completely the waste of rock-soil mass, and is suitable for various complicated terrains.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for quickly transporting a coal mine by overcoming geological condition obstacles.
Background
At present, in common coal mining, the transportation bridge bridging method has the following problems:
(1) the transportation bridge bridging equipment usually adopts a road bridge and a hydraulic support to build a bridge, replaces original stone and soil, but because secondary stripping only occurs between a bridge body and a stope, the bridge body going to the direction of the dumping site can also discard the earth and the stone in short distance, so that the bridge body in the prior art loses the advantage that the rock and soil transportation bridge body can be simultaneously used as a dumping body for mining waste soil in the stope.
(2) The existing open coal mine transportation bridge bridging equipment and the existing open coal mine transportation bridge bridging technology have the defects that a stope and a refuse dump are separated by a bridge body, so that operation equipment and transportation equipment in a lower stope and a mining area cannot be communicated with each other, a lower coal transportation line is blocked, and the equipment is difficult to transfer in and out.
(3) The problem that the height of a hydraulic support structure is not enough exists in the existing bridging equipment, the maximum supporting height of the existing domestic hydraulic support is 8.8m, the height of one step is not enough, the transportation bridge setting can only be carried out on the next step of a stope, the function of conveying stripped objects on the middle upper part of the stope to a refuse dump in a reduced transportation distance cannot be achieved, and the applicability is not enough.
(4) The existing open pit coal mine bridging equipment has the defects of high once investment cost, continuous investment in maintenance cost in daily life, and the need of a special person for monitoring and controlling a hydraulic control system. For example, the purchase cost of a ZY8640/25.5/55 type hydraulic support is about 54 ten thousand yuan, and the daily maintenance cost is not contained, such as hydraulic oil, a liquid supply pipeline and the like, the width of the general hydraulic support is 1.75m, at least 114 hydraulic supports, namely 6156 ten thousand yuan, are required according to a 100m transportation bridge body, and the maintenance cost and the labor cost are not contained. According to the width of a transport bridge body of 15m, the height of a transport step of 20m and the cost of loose stripping materials of 4.5 yuan/m3The secondary peeling cost was calculated to be 11.7 ten thousand yuan, requiring 25967m 3.
(5) The hydraulic support is difficult to disassemble and install, the hydraulic support liquid supply pipeline is complex, the construction process is complex, and the disassembly and the installation need professional personnel to operate, so that the disassembly and installation period of the whole bridging equipment is long.
(6) The requirement on the geological condition of a stope and a dump bridging area is strict, the ground must be guaranteed to be flat, otherwise the problem that the support is unstable when toppled is caused, and then the plane of the coal seam bottom plate is not an ideal plane and is fluctuated and concave, so that the applicability is insufficient.
Disclosure of Invention
The invention aims to provide a bridging construction method between an open pit coal mine stope and a refuse dump, and aims to solve the problems of high equipment cost investment, insufficient applicability, complex construction procedures and specially-assigned control hydraulic control systems in the conventional open pit coal mine bridging equipment and technology.
In order to achieve the purpose, the invention provides the following technical scheme: a construction method for bridging between an open pit coal mine stope and a dump comprises two parts of a dump extension design and a bridging design;
the extension design part of the refuse dump comprises the following steps:
digging a mined-out area between a refuse dump and a mining field, wherein the height of the mined-out area is h, arranging a rock-soil transportation bridge body extending to the mining field at the refuse dump, arranging a passage between the rock-soil transportation bridge body and the mining field, and the width of the passage is b;
(II) setting a step slope angle of a stope as alpha; setting a natural repose angle between the rock-soil transport bridge body and the ground as beta;
thirdly, with the mining propulsion of the steps of the stope, the rock-soil transportation bridge body is lengthened to be equal to the mining propulsion length of the steps of the stope;
the bridging design part comprises the following steps:
the allowance of the bridge erection on the rock-soil transportation bridge body and the stope is c, and the c is 1/3 h;
(II) the length of the bridge is as follows:
L＝h/tanβ+b+h/tanα+2c
and thirdly, pulleys are arranged at the lower end of the bridge, a pair of tracks for connecting the rock-soil transportation bridge body and the stope are arranged, the length of each track is 2L, the pulleys of the bridge are arranged on the tracks, and the bridge is propelled along with the mining of stope steps.
Preferably, the angle α is 60 ° to 70 °, and the angle β is 33 ° to 35 °.
Preferably, the bridge is a steel truss bridge.
Compared with the prior art, the invention has the beneficial effects that: the problem of secondary stripping is completely avoided by utilizing the combination mode of the rock-soil bridge body and the steel truss bridge, and meanwhile, the device is simple in structure, short in transportation distance and convenient to disassemble and assemble. The equipment vehicles in the mined-out areas on the two sides of the bridge body can be transported in an intercommunicating manner, the long-distance detouring stope or the dump and the operation equipment do not run in a crossed manner, the transportation distance on the two sides of the bridge body is shortened, and the transportation safety is guaranteed.
The self-abandoning advantage of the rock-soil bridge is fully utilized by adopting a rock-soil bridge body and steel truss bridge combined mode, the span of the steel structure bridge body is reduced, and the equipment investment is reduced.
The problem of the link up of equipment transportation on both sides of the bridge body is solved, so that the working vehicle does not need to detour around a stope or a refuse dump for a long distance. The invention has the characteristics of economy, convenience and high efficiency.
The bottom of the bridge body is completely the abandoned object of the stope, and the bridge body is suitable for various complicated terrains.
Drawings
FIG. 1 is a schematic plan view of the construction method for bridging between a stope and a refuse dump of an open pit coal mine according to the present invention.
FIG. 2 is a schematic view of a mined-out area of the construction method for bridging between a stope and a refuse dump of an open pit coal mine according to the present invention.
FIG. 3 is a working condition diagram of the construction method for bridging between the stope and the dump of the open pit coal mine.
FIG. 4 is a diagram of the post-mining operating conditions of the stope of the construction method for bridging between the stope and the refuse dump of an open pit coal mine according to the present invention.
1. A refuse dump; 2. stopes; 3. carrying out rock-soil transportation on the bridge body; 4. bridging; 5. a track.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a construction method for bridging between an open pit coal mine stope and a dump comprises two parts of a dump extension design and a bridging design;
the extension design part of the refuse dump comprises the following steps:
digging a mined-out area between the refuse dump 1 and the mining area 2, wherein the height of the mined-out area is h, and the heights of the top surfaces of the refuse dump 1 and the mining area 2 from the bottom surface of the mined-out area are h. The rock-soil transportation bridge body 3 extending to the stope is arranged on the refuse dump 1, and the foundation soil mass of the rock-soil transportation bridge body 3 is built by the waste soil extracted from the stope 2, so that the rock-soil transportation bridge body 3 has the advantage of being used as the refuse dump of the stope. A passage is arranged between the rock-soil transportation bridge body 3 and the stope 2 and used for passing vehicles below the bridge 4, and the width of the passage is b;
(II) setting the step slope angle of the stope 2 as alpha; setting a natural repose angle between the rock-soil transport bridge body 3 and the ground as beta;
and thirdly, the steps of the stope 2 are continuously pushed along with the mining of the steps. The extracted waste soil is continuously accumulated to the rock-soil transport bridge body 3, so that the length of the rock-soil transport bridge body 3 is prolonged to be equal to the mining propulsion length of the step of the stope 2, and the width of the passage is b all the time.
The bridging design part comprises the following steps:
the residual amount of the (first) bridge 4 arranged on the rock-soil transportation bridge body 3 and the stope 2 is c, and c is 1/3h, so that when the residual amount of the two ends of the bridge 4 is fixed on the rock-soil transportation bridge body 3 and the stope 2, the bridge 4 can realize better bearing effect.
(II) the length of the bridge 4 is as follows:
L＝h/tanβ+b+h/tanα+2c
and (III) moving the bridge 4 along with the advancing of the rock-soil transport bridge body 3 and the stope 2. The lower end of the bridge 4 is provided with a pulley, a pair of tracks 5 for connecting the rock-soil transportation bridge body 3 and the stope 2 is arranged, the length of each track 5 is 2L, the pulley of the bridge 4 is arranged on each track 5, and the bridge 4 is propelled along with the mining of stope steps, so that the bridge 4 does not need to be completely disassembled for many times, and the connection between the rock-soil transportation bridge body 3 and the stope 2 is realized. Meanwhile, when the track 5 arranged on the stope 2 influences the normal mining of the layer, the part of the track 5 can be dismantled, and the bridge 4 is moved to the rock-soil transportation bridge body 3 by utilizing the track. After the steps of the stope 2 on the layer are mined, the tracks 5 are reassembled, and then the bridge 4 is moved forwards to realize subsequent transportation.
The step slope angle alpha of the stope 2 is selected to be 60-70 degrees according to the soil property. However, the soil property of the angle alpha of the rock and soil transport bridge body 3 is the earthwork excavated from the stope 2, and the angle beta is 33-35 degrees in order to ensure the stability of the main body of the rock and soil transport bridge body 3.
The bridge 4 is a steel truss bridge, and the floor area and the whole weight are reduced on the premise of ensuring the whole strength.
The working principle is as follows: in the process of mining the stope 2, a large amount of waste soil is generated during mining, and if the waste soil is not transported in time, the waste soil is removed by secondary stripping. Arranging a rock-soil transportation bridge body 3 extending to a stope on a refuse dump 1 by utilizing waste soil generated during mining, and reserving a passage convenient for subsequent traffic; in order to ensure the integral stability of the rock-soil transportation bridge body 3, the natural repose angle is controlled between 33 degrees and 35 degrees, and then the bridge is arranged on the rock-soil transportation bridge body 3 and the stope 2, the whole transportation process becomes very stable, the mutual passing of the two side areas of the steel truss bridge is realized, and the running of material transportation, equipment transfer, commuting command, emergency rescue and the like is not obstructed.
In the process of setting up the bridge, set up a pair of track 5 of connecting ground transportation pontic 3 and stope 2 earlier, and the length of track 5 is 2L to locate the steel truss bridge of installing the guide pulley on it, along with the exploitation of the step of stope 2, its step is advancing constantly, and ground transportation pontic 3 is advancing constantly also. At the moment, the subsequent transportation work can be carried out only by adjusting the fixed positions of the steel truss bridge, the rock and soil transportation bridge body 3 and the stope 2 and paving the bridge sleeper and the steel plate on the bridge deck of the steel truss bridge. When the track 5 may influence the normal mining of the stope 2, part of the track 5 can be temporarily removed, and the bridge 4 is moved to the rock-soil transportation bridge body 3 by using the track. And after the mining of the stope 2 on the layer is finished, the track 5 is reinstalled, and then the steel truss bridge is reconnected with the rock-soil transport bridge body 3 and the stope 2. The transportation scheme overcomes the geological condition obstacle and is not influenced by the height fluctuation and the concave-convex plane of the ground in the mined-out area.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A construction method for bridging between an open pit coal mine stope and a refuse dump is characterized in that: the method comprises two parts of extension design and bridging design of the refuse dump;
the extension design part of the refuse dump comprises the following steps:
digging a mined-out area between a refuse dump (1) and a mining field (2), wherein the height of the mined-out area is h, the heights of the top surfaces of the refuse dump (1) and the mining field (2) from the bottom surface of the mined-out area are h, a rock and soil transport bridge body (3) extending to the mining field (2) is arranged on the refuse dump (1), a passage is arranged between the rock and soil transport bridge body (3) and the mining field (2), and the width of the passage is b;
setting a step slope angle of the stope (2) as alpha; setting a natural repose angle between the rock-soil transport bridge body (3) and the ground as beta;
thirdly, with the mining propulsion of the steps of the stope (2), the rock-soil transportation bridge body (3) is lengthened by the length equal to the mining propulsion length of the steps of the stope (2);
the bridging design part comprises the following steps:
the balance of the rock-soil transportation bridge body (3) and the balance of the bridge (4) on the stope (2) are respectively c, and c =1/3 h;
(II) the length of the bridge (4) is as follows:
L=h/tanβ+b+h/tanα+2c
and thirdly, pulleys are arranged at the lower end of the bridge (4), a pair of tracks (5) for connecting the rock-soil transportation bridge body (3) and the stope (2) is arranged, the length of each track (5) is 2L, the pulleys of the bridge (4) are arranged on the tracks (5), and the bridge (4) is pushed along with the mining of stope steps until the construction is completed.
2. The method of bridging a mine pit and a refuse dump according to claim 1, wherein: the angle alpha is 60-70 degrees, and the angle beta is 33-35 degrees.
3. The method of bridging a mine pit and a refuse dump according to claim 1, wherein: the bridge (4) is a steel truss bridge.
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| CN202010978318.2A CN112030773B (en) | 2020-09-17 | 2020-09-17 | Construction method for bridging between open pit coal mine stope and refuse dump |
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| CN202010978318.2A CN112030773B (en) | 2020-09-17 | 2020-09-17 | Construction method for bridging between open pit coal mine stope and refuse dump |
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| CN112030773B true CN112030773B (en) | 2021-12-14 |
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| CN113344328A (en) * | 2021-05-07 | 2021-09-03 | 北方魏家峁煤电有限责任公司 | Method and device for delimiting outer soil discharge field of opencast coal mine |
Citations (7)
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|---|---|---|---|---|
| DD105027A1 (en) * | 1973-04-10 | 1974-04-05 | ||
| CN103133003A (en) * | 2013-02-25 | 2013-06-05 | 中国矿业大学 | Opencast mine end slope near-slope mining method |
| CN103334755A (en) * | 2013-07-12 | 2013-10-02 | 鞍钢集团矿业公司 | Slope hoisting and crushing system for deep open-pit mine |
| AU2015100067A4 (en) * | 2014-03-05 | 2015-03-05 | Emergent Mining Technologies Pty Ltd | A System for the Reduction in Applied Energy, Improved Efficiencies and Reduced Costs in Open Pit Mining |
| CN104806247A (en) * | 2015-04-28 | 2015-07-29 | 中国矿业大学 | Transport method of building longitudinal composite bridge in middle of strip mine stope |
| CN106638272A (en) * | 2017-02-27 | 2017-05-10 | 辽宁工程技术大学 | Self-moving type vehicular bridge for striding over belt conveyors |
| CN110331651A (en) * | 2019-07-24 | 2019-10-15 | 辽宁工程技术大学 | It is a kind of for connecting the automatic moving type bridge of overhead travelling crane of open-pit mine stope and internal dumping |
-
2020
- 2020-09-17 CN CN202010978318.2A patent/CN112030773B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD105027A1 (en) * | 1973-04-10 | 1974-04-05 | ||
| CN103133003A (en) * | 2013-02-25 | 2013-06-05 | 中国矿业大学 | Opencast mine end slope near-slope mining method |
| CN103334755A (en) * | 2013-07-12 | 2013-10-02 | 鞍钢集团矿业公司 | Slope hoisting and crushing system for deep open-pit mine |
| AU2015100067A4 (en) * | 2014-03-05 | 2015-03-05 | Emergent Mining Technologies Pty Ltd | A System for the Reduction in Applied Energy, Improved Efficiencies and Reduced Costs in Open Pit Mining |
| CN104806247A (en) * | 2015-04-28 | 2015-07-29 | 中国矿业大学 | Transport method of building longitudinal composite bridge in middle of strip mine stope |
| CN106638272A (en) * | 2017-02-27 | 2017-05-10 | 辽宁工程技术大学 | Self-moving type vehicular bridge for striding over belt conveyors |
| CN110331651A (en) * | 2019-07-24 | 2019-10-15 | 辽宁工程技术大学 | It is a kind of for connecting the automatic moving type bridge of overhead travelling crane of open-pit mine stope and internal dumping |
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