CN102839984B - Oversized-section underground supporting structure - Google Patents

Oversized-section underground supporting structure Download PDF

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Publication number
CN102839984B
CN102839984B CN201210317918.XA CN201210317918A CN102839984B CN 102839984 B CN102839984 B CN 102839984B CN 201210317918 A CN201210317918 A CN 201210317918A CN 102839984 B CN102839984 B CN 102839984B
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supporting
anchor
meters
lane
support
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CN102839984A (en
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刘西西
王永志
宋强军
吉路波
陈路
李永浍
赵学斌
张广云
陈江华
牛海军
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Abstract

The invention relates to the technology of underground supporting of a coal mine, in particular to an oversized-section underground supporting structure, which solves the oversized-section supporting problems generating under special production conditions. The oversized-section underground supporting structure comprises roof supporting (1) and roadside supporting (2). In the roof supporting, a spare rack port is reinforced on the basis of supporting a single anchor bolt of the original track lane, and the construction of roadside expansion and bottom lifting can be carried out, each row is additionally provided with three anchor bolts, one row of single anchor cables is punched between every two rows of anchor bolts, three rows of single hydraulic props are adopted at the middle part in order to assist and strengthen the supporting, and the distance among the rows is 1.5 meter. In the roadside supporting, the supporting of the single anchor bolts is adopted, shoulder anchor bolts and floor anchor rods form an 20-degree angle with the level, the other anchor bolts are all perpendicular to the sides, the distance among the rows is 1.5 meter, the pre-tightening moment is larger than 300N.M, the anchoring force is larger than 150KN, and the distance is 700mm. The technical scheme of the oversized-section underground supporting structure provided by the invention has the advantages that an installation space for filling a template rack is provided within a special lane, from the aspect of the supporting intensity, the supporting structure is a supporting mode with the maximum supporting intensity in the existing coal road digging process, and from the aspect of the supporting effect, no phenomena, such as roof settling and the like happen in the installation process. Moreover, the technical scheme of the oversized-section underground supporting structure has the advantages of high safety factor and simpleness in construction.

Description

Down-hole large section supporting and protection structure
Technical field
The present invention relates to a kind of underground coal mine support technology, be specially a kind of down-hole large section supporting and protection structure.
Background technology
In coal mining, the normal span length produced generally is no more than 4 meters, takes general supporting measure to be effective.Along with the scale of coal in China exploitation is increasing, the device category that extraction technique progress uses is more and more advanced, and volume is increasing, and the section in tunnel also requires increasing, supporting in well-known underground mining is the basis that colliery routine safety is produced, and is the most important thing of all working.How in satisfied ventilation, transport, pedestrian, overhaul of the equipments and while installing needs, ensure its supporting intensity, guarantee construction safety.In theory, section is wider, and the impact being subject to geostatic stress is larger, and be out of shape more obvious, the danger of collapsing is also higher.The increase of drift section, brings huge difficulty to roadway maintenance, has had a strong impact on safety of coal mines High-efficient Production.
About large section support theory, had many sections of technical schemes, but mostly concentrate on be no more than 7 meters tunnel within the scope of.Under the geological conditions of down-hole complexity, often increase the width of a meter, all can bring the great variety of geostatic stress, in order to ensure coal mine production safety, detailed research must be carried out to the change of geostatic stress, taking supporting means the safest.
As schematically shown in Figure 4, No. 15, certain ore deposit coal 154307 fully-mechanized mining working adopts gob side entry retaining to arrange, can realize without coal pillar mining, reduces tunnelling rate; Gob side entry retaining adopts three filling framework supports, for mounting bracket, support need be opened for mouth region 7, finally form long × wide × high=large section of 20 × 10 × 2.9 meters, i.e. x in figure, y, m, n 4 regions surrounded, can meet the installation requirements of filling framework support, for large section how supporting, become one pendulum difficult problem at full ore deposit technical elements.In existing documents and materials, also do not see the research about 10 meters and above width roadway support.
Summary of the invention
The present invention, in order to solve the support issues of the large section occurred under specific working condition, provides a kind of down-hole large section supporting and protection structure.
Technical scheme of the present invention is, a kind of down-hole large section supporting and protection structure, its position is the intersection in working face open-off cut eye, sluicing lane, track lane, track lanewidth 4.6 meters, working face open-off cut eye and sluicing lane beam overall are 10 meters, and support is wide 5.4 meters for mouth, long 10 meters, the rectangular cross section formed is meter wide × 2.9,20 meters of long × 10 meter high large sections
The supporting and protection structure of this section is, (1) roof timbering: on the monomer bolt support basis in original track lane, for mouth, reinforcement is carried out to support, carry out out again having helped bottom application work, often newly-increased 3 anchor poles of row, it is vertical with top board that the anchor pole of top board installs angle, and array pitch is 1.5 meters, pre-fastening moment is greater than 300NM, and anchored force is greater than 150KN; Beat note one between every two row's anchor poles and arrange monomer anchor cable, often arrange 5 covers, cable interval 2 meters, array pitch 1.5 meters, anchor cable protruded length is not more than 300 ㎜, and pretightning force reaches more than 100KN.
Adopt three row's hydraulic props to carry out assistant reinforcement supporting, array pitch 1.5 meters at middle part;
(2) roadside support: adopt the bolt support of monomer lane side, except fillet, FLOOR ANCHOR become 20 to be outside one's consideration with level, all the other are all vertical in portion of side, and array pitch is 1.5 meters, and pre-fastening moment is greater than 300NM, and anchored force is greater than 150KN, spacing 700mm.
The beneficial effect of large section support technology scheme of the present invention is: installing for filling framework support in specific tunnel and provide installing space, from supporting intensity, is the support pattern that in current coal roadway tunneling process, supporting intensity is maximum; From supporting effect, in installation process, do not find phenomenons such as crushing, subzero heavy after real realization pick; From installation effect, installation process is simple to operation; From safety in production, the safe zero defects of installation process; From supporting section, first time realizes 20 × 10 × 2.9 meters of section supportings, in the future more the effective support of big cross section provide valuable reference; From technology content, this cover support theory is reasonable in design, and supporting intensity is large, and safety factor is high, easy construction; Smooth back production for my ore deposit 154307 fully-mechanized mining working opens a new situation.
Before exploitation, rock stratum is in virgin state of stress, except gravitational stresses, also there are tectonic stress, thermal stresses and swelling stress etc., is in metastable state.After adopting, the stress state of original stable is destroyed, and each several part stress will redistribute, wherein top board and each rock stratum to support because losing and under the effect of deadweight, bending subsidence, and tensile stress appears in result bottom it, when tensile stress goes beyond the limit, namely top board is destroyed.After support excavates for mouth place, do not have the support of coal body, roof strata loses support, under the roof*.cross breaker prop effect that immediate roof produces in deadweight and prop, disrumpent feelings along coal body edge, the semi girder state of disrumpent feelings immediate roof in rank of falling from power.Support in mine gateway only need keep the complete of immediate roof and with being close to of always pushing up, can not change the roof strata transitional period movable time the size of the amount of crushing, lane inner support and roadside support can not retrain that the roof strata later stage is movable and translation that is that cause is sunk, the size of Support Resistance to be sunk not impact on the translation of later stage movable panel.That is, translation sinks to having " given deformation " feature, and now support load depends on the size of supporting effective rigidity completely.Effective rigidity is larger, and load is also larger, rule that this rule is called " firmly propping up overloading ".Another key character that translation is sunk is: the stability generally not destroying the balanced structure that early stage is formed, and rock stratum can be made along the inner boundary of balanced structure to lane space " contraction ", and that is, the scope of rock stratum Equilibrium structure increases.If when roof strata is more complete, the interior critical surface of strata structure can " shrink " on the contoured surface of tunnel, and now, the stability influence of roadway support to roadway surrounding rock structure is little.Because this 15# region coal top board is K2 limestone, and its thickness reaches 9.01 meters, thus takes to strengthen supporting intensity, and first being connect by cap rock layer is an entirety, then adopts suitable strengthening supporting, requirement that can meet and install filling support of crushing to prevent it.
Accompanying drawing explanation
Fig. 1 is roadway layout structural representation
Fig. 2 is the A-A sectional drawing of Fig. 1
Fig. 3 is the top view of Fig. 2
Fig. 4 is roadside support structural representation
In figure: 1-sluicing lane, 2-working face open-off cut eye, 3-caving drill site, 4-return air connection roadway, 5-winch cave, 6-track lane, 7-support for mouth, 8,9,10,11,12,13-anchor pole, 14,15,16,17,18-anchor cable, 19,20,21-monomer columns, 22,23,24-lane side anchor poles.
Detailed description of the invention
A kind of down-hole large section supporting and protection structure, as schematically shown in Figure 4, its position is working face open-off cut eye 2, sluicing lane 1, the intersection in track lane 6, track lane 6 is wide 4.6 meters, working face open-off cut eye 2 and sluicing lane 1 beam overall are 10 meters, support is wide 5.4 meters for mouth 7, long 10 meters, the rectangular cross section formed is meter wide × 2.9,20 meters of long × 10 meter high large sections, region (x as shown in Figure 4, y, m, n), the supporting and protection structure of this section is, (1) roof timbering: at original track lane 6 monomer anchor pole 8, 9, on 10 supporting bases, for mouth 7, reinforcement is carried out to support, carry out out again having helped bottom application work, often newly-increased 3 anchor poles 11 of row, 12, 13, anchor pole adopts ¢ 22-M24-2000 ㎜ high-strength deformed steel bar anchor pole, anchorage style is resin the extensible bolting, adopt two Anchor Agents, a specification is K2335, another specification is Z2360, bore diameter 28 ㎜, anchorage length 1208 ㎜, pallet adopts supporting high strength arch tray, it is vertical with top board that angle installed by roofbolt, array pitch is 1.5 meters, pre-fastening moment is greater than 300NM, anchored force is greater than 150KN, beat note one between every two row's anchor poles and arrange monomer anchor cable, namely at anchor pole 8, 9, 10, 11, 12, anchor cable 14 is played between adjacent anchor pole in 13, 15, 16, 17, 18, often arrange 5 covers, cable interval 2 meters, array pitch 1.5 meters, anchor cable is high strength low relaxation steel strand, length 6.3 meters, diameter 17.8 ㎜, head is provided with resin anchoring agent stirring-head, afterbody is furnished with high-strength anchor device, effective support length 6 meters, anchorage style is end anchor, adopt three Anchor Agents, a specification is K2335, another two specifications are Z2360, bore diameter 28 ㎜, anchorage length 1485 ㎜, anchor cable protruded length is not more than 300 ㎜, pretightning force reaches more than 100KN.Adopt three row's hydraulic props 19,20,21 to carry out assistant reinforcement supporting, array pitch 1.5 meters at middle part;
(2) roadside support: as schematically shown in Figure 3, adopt monomer bolt support, lane side anchor pole 22, 23, 24 adopt ¢ 22-M24-2000 ㎜ high-strength deformed steel bar anchor pole, anchorage style is resin the extensible bolting, adopt two Anchor Agents, a specification is K2335, another specification is Z2360, bore diameter 28 ㎜, anchorage length 1208 ㎜, pallet adopts supporting high strength arch tray, except fillet, FLOOR ANCHOR becomes 20 to be outside one's consideration with level, all the other are all vertical with portion of side, array pitch b is 1.5 meters, pre-fastening moment is greater than 300NM, anchored force is greater than 150KN, spacing a is 700mm.

Claims (1)

1. a down-hole large section supporting and protection structure, its position is working face open-off cut eye (2), sluicing lane (1), the intersection in track lane (6), track lane (6) is wide 4.6 meters, working face open-off cut eye (2) and sluicing lane (1) beam overall are 10 meters, support is wide 5.4 meters for mouth (7), long 10 meters, the rectangular cross section formed is meter wide × 2.9,20 meters of long × 10 meter high large sections, it is characterized in that: the supporting and protection structure of this section is, (1) roof timbering: at original track lane (6) monomer anchor pole (8, 9, 10) on supporting basis, for mouth (7), reinforcement is carried out to support, carry out out again having helped bottom application work, often newly-increased 3 anchor poles (11 of row, 12, 13), it is vertical with top board that angle installed by roofbolt, beat note one between every two row's anchor poles and arrange monomer anchor cable, namely between adjacent anchor pole, anchor cable is played, often arrange 5 covers, cable interval 2 meters, array pitch 1.5 meters, three row's hydraulic props (19 are adopted at middle part, 20, 21) assistant reinforcement supporting is carried out, array pitch 1.5 meters,
(2) roadside support: adopt monomer bolt support, side anchor pole (22,23,24) pallet in lane adopts supporting arch tray, except fillet, FLOOR ANCHOR become 20 to be outside one's consideration with level, all the other are all vertical with portion of side, array pitch b is 1.5 meters, pre-fastening moment is greater than 300NM, and anchored force is greater than 150KN, and spacing a is 700mm;
Roofbolt adopts ¢ 22-M24-2000 ㎜ high-strength deformed steel bar anchor pole, anchorage style is resin the extensible bolting, adopt two Anchor Agents, a specification is K2335, and another specification is Z2360, bore diameter 28 ㎜, anchorage length 1208 ㎜, pallet adopts supporting high strength arch tray, and array pitch is 1.5 meters, pre-fastening moment is greater than 300NM, and anchored force is greater than 150KN; Anchor cable is high strength low relaxation steel strand, length 6.3 meters, diameter 17.8 ㎜, head is provided with resin anchoring agent stirring-head, and afterbody is furnished with high-strength anchor device, effective support length 6 meters, anchorage style is end anchor, adopt three Anchor Agents, a specification is K2335, and another two specifications are Z2360, bore diameter 28 ㎜, anchorage length 1485 ㎜, anchor cable protruded length is not more than 300 ㎜, and pretightning force reaches more than 100KN; Side anchor pole in lane adopts ¢ 22-M24-2000 ㎜ high-strength deformed steel bar anchor pole, and anchorage style is resin the extensible bolting, and adopt two Anchor Agents, a specification is K2335, and another specification is Z2360, bore diameter 28 ㎜, anchorage length 1208 ㎜.
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CN104141503A (en) * 2014-06-28 2014-11-12 四川省华蓥山煤业股份有限公司绿水洞煤矿 Sharp inclination fully mechanized coal face open-off cut square supporting method
CN104153790B (en) * 2014-07-29 2016-04-13 开滦(集团)有限责任公司林南仓矿业分公司 Coal-face cuts ramus ophthalmicus protection structure and supporting method thereof
CN107654247B (en) * 2017-09-22 2019-04-16 中国矿业大学 A kind of sliding structure area pole loose thick coal layer coal roadway tunneling is met head on anti-top coal leakage method for leakage
CN108104821B (en) * 2017-11-22 2019-12-03 平顶山天安煤业股份有限公司十一矿 Large section open*.off construction and its method for protecting support
CN108518234A (en) * 2018-03-27 2018-09-11 中国矿业大学(北京) A kind of wrong title formula anchor cable method for arranging of extra-large cross-section open-off cut Roof Control
CN108979686B (en) * 2018-08-29 2020-01-03 北京圆之翰工程技术有限公司 Method for supporting top plate of coal mine underground goaf
CN108979687B (en) * 2018-08-29 2020-01-03 北京圆之翰工程技术有限公司 Advancing coal mining method adopting goaf roof support in underground coal mine
CN110374645A (en) * 2019-08-14 2019-10-25 缪协兴 A kind of super high seam big cross section thin coal pillar gob side entry Equivalent Support method
CN113503179A (en) * 2021-08-02 2021-10-15 太原理工大学 Method for controlling large-section open-off cut tunneling surrounding rock of overlying goaf ultra-close coal seam
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