CN104675412A - Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway - Google Patents

Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway Download PDF

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Publication number
CN104675412A
CN104675412A CN201510075667.2A CN201510075667A CN104675412A CN 104675412 A CN104675412 A CN 104675412A CN 201510075667 A CN201510075667 A CN 201510075667A CN 104675412 A CN104675412 A CN 104675412A
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CN
China
Prior art keywords
supporting
surrounding rock
protection
shaped steel
roadway
Prior art date
Application number
CN201510075667.2A
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Chinese (zh)
Inventor
臧龙
何红生
肖金成
赵训林
罗泽中
黄�俊
张杨
陈华平
Original Assignee
湖南省煤炭地质勘查院
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Application filed by 湖南省煤炭地质勘查院 filed Critical 湖南省煤炭地质勘查院
Priority to CN201510075667.2A priority Critical patent/CN104675412A/en
Publication of CN104675412A publication Critical patent/CN104675412A/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts

Abstract

The invention discloses a closed integral bearing supporting structure for a coal-mine coal-pillar bottom plate crushed surrounding rock roadway, which comprises U-shaped steel brackets, a surrounding rock grouting reinforcement layer, a stable surrounding rock layer, prestress strap beam anchor cables and a roadway bottom plate supporting structure. As basic supports, the U-shaped steel brackets are arranged at an equal interval along the axial direction of a roadway; as reinforcing supports, the prestress strap beam anchor cables are arranged vertically to the surfaces of surrounding rocks of the roadway along the peripheral direction of the roadway between the U-shaped steel brackets; the single U-shaped steel brackets are connected into one whole body by one ends of the prestress strap beam anchor cables; the other ends of the prestress strap beam anchor cables are fixed in the stable surrounding rock layer; the roadway bottom plate supporting structure consists of concrete, a reinforcement mesh, a steel channel, anchor rods and anchor cables. According to the invention, the prestress strap beam anchor cables also can be used for connecting the stable surrounding rock layer, the surrounding rock grouting reinforcement layer and the U-shaped steel brackets and forms the closed integral bearing supporting structure with the roadway bottom plate supporting structure. The closed integral bearing supporting structure can eliminate a weak position of the roadway and ensures uniform deformation and long-term stability of the surrounding rocks of the roadway.

Description

Integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel
Technical field
The present invention relates to a kind of colliery tunnel support structure, especially relate to a kind of mine coal column base plate breaking surrounding rock tunnel and close integrated carrying supporting and protection structure.
Background technology
The a lot of mining area of China is when roadway layout; for improve tunnel its maintenance situation, prevent spontaneous combustion of coal seam from getting angry, improve tunnel transport capacity, ensure safe and efficient production; to be gone down the hill in longer for service time main large lane, exploiting field and set of segments inter-road is all arranged in the more stable floor strata of country rock, stay the protection coal pillar establishing one fixed width be such base plate tunnel mainly protect lane mode.But by the impact of on-the-spot actual mining conditions; not only stay the protection coal pillar established usually not play the effect of protection base plate tunnel; tunnel is made to be subject to the impact of high bearing pressure on coal column and strong deformation on the contrary; especially the joint fissure breaking surrounding rock tunnel of very growing is under high stress; roadway support structure often owing to adopting is improper, and is absorbed in the vicious circle of " repairing after front pick ".
Roadway support structure common is at present open supporting and protection structure, and this supporting and protection structure only carries out emphasis reinforcing and supporting to roadway's sides and roof rock, and seldom takes effective reinforcement measure to floor rocks.When tunnel buried depth is more shallow, because vertical stress value is little, even if roadway floor does not take reinforcement measure, also can guarantee that it is stablized, thus be unlikely to produce larger pucking amount.But for coal column base plate breaking surrounding rock tunnel, situation then will be different greatly.Due to the effect by high bearing pressure on coal column, the vertical stress in coal column base plate tunnel country rock is very high, under its effect, does not take the base plate of reinforcement measure then to become the most weak part in tunnel.The release of roadway surrounding rock stress and the dilatation distortion of rock mass will concentrate on base plate, thus cause strongly bloating of floor rocks, and bloating of floor rocks has obvious continuation, and be difficult to from line stabilization, and by have a strong impact on side, topmast protection structure stable, the deformation instability of globality destroys finally to cause tunnel to occur.
Summary of the invention
The object of the invention is the weak point overcome in prior art, simply, easily integrated carrying supporting and protection structure is closed in construction, effective mine coal column base plate breaking surrounding rock tunnel to provide a kind of method.
For achieving the above object, the technical solution used in the present invention is: integrated carrying supporting and protection structure is closed in a kind of mine coal column base plate breaking surrounding rock tunnel, comprise U-shaped steel bracket, wall rock grouting back-up coat, stabilizing surrounding rock layer, prestressing force band beam anchor cable and roadway floor supporting and protection structure, described U-shaped steel bracket as basic supporting along tunnel axial equidistant placement, prestressing force band beam anchor cable is arranged along tunnel circumference perpendicular to roadway surrounding rock surface between U-shaped steel bracket as strengthening supporting, single U-shaped steel bracket is connected into an entirety by one end of prestressing force band beam anchor cable, its other end is fixed in stabilizing surrounding rock layer, described roadway floor supporting and protection structure is by concrete, steel mesh reinforcement, channel-section steel, anchor pole and anchor cable composition, described prestressing force band beam anchor cable is by stabilizing surrounding rock layer, wall rock grouting back-up coat and U-shaped steel bracket couple together, and form closed integrated carrying supporting and protection structure with roadway floor supporting and protection structure.
The material of described U-shaped steel bracket is 36U shaped steel, and U-shaped steel bracket array pitch D is 500mm, and U-shaped steel bracket lap length L1 is 500 ~ 550mm, and card cable nut pre-fastening moment is 300 ~ 400Nm.
Described wall rock grouting back-up coat (2) thickness is 4000mm, and slip casting strengthening material is cement grout.
Described prestressing force band beam anchor cable and baseboard anchor cable are 1860 steel strand of Φ 17.8mm, resin the extensible bolting in stabilizing surrounding rock layer, anchor cable pretightning force 120 ~ 150kN.
The joist of described prestressing force with beam anchor cable adopts U-shaped steel to process, and length L2 is 1671mm; Base angle prestressing force with beam anchor cable is 200 ~ 300mm apart from roadway floor distance h.
Concrete thickness d in described roadway floor supporting and protection structure is 200mm, and intensity is C30.
Channel-section steel in described roadway floor supporting and protection structure adopts the processing of 18# channel-section steel.
Anchor pole in described roadway floor supporting and protection structure adopts the left-handed nothing of Φ 22 × 3000mm to indulge muscle twisted steel anchor rod, and yield strength is not less than 400MPa; Along vertical working axial direction, adopt channel-section steel that anchor pole, anchor cable are linked to be entirety.
Beneficial effect of the present invention: the weak part that tunnel can be eliminated, farthest play the supporting capacity of various support pattern, and reach collaborative integer support effect, avoid occurring simple combination, by the supporting effect of defeating in detail, thus ensure that homogeneous deformation and the long-term stability thereof of roadway surrounding rock.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is A-A cross sectional side view in Fig. 1.
In figure: 1-U shape steel bracket, 2-wall rock grouting back-up coat, 3-stabilizing surrounding rock layer, 4-prestressing force band beam anchor cable, 5-concrete, 6-steel mesh reinforcement, 7-channel-section steel, 8-anchor pole, 9-anchor cable, 10-card cable, 11-joist, L1-support lap length, L2-joist length, h-base angle prestressing force band beam anchor cable distance roadway floor distance, d-concrete thickness, D-U shape steel bracket array pitch.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1 and Figure 2, integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel of the present invention, comprises U-shaped steel bracket 1, wall rock grouting back-up coat 2, stabilizing surrounding rock layer 3, prestressing force band beam anchor cable 4 and roadway floor supporting and protection structure.Described U-shaped steel bracket 1 is as basic supporting along tunnel axis equidistant placement, and the material of U-shaped steel bracket 1 is 36U shaped steel, and U-shaped steel bracket 1 array pitch D is 500mm, and U-shaped steel bracket 1 lap length L1 is 500 ~ 550mm, and card cable 10 nut pre-fastening moment is 300 ~ 400Nm.Described wall rock grouting back-up coat 2 thickness is 4000mm, and slip casting strengthening material is cement grout.Described prestressing force band beam anchor cable 4 is arranged along tunnel circumference perpendicular to roadway surrounding rock surface between U-shaped steel bracket 1 as strengthening supporting, single U-shaped steel bracket 1 is connected into an entirety by one end of prestressing force band beam anchor cable 4, and its other end is fixed in stabilizing surrounding rock layer 3.Described roadway floor supporting and protection structure is made up of concrete 5, steel mesh reinforcement 6, channel-section steel 7, anchor pole 8 and anchor cable 9.Prestressing force band beam anchor cable 4 and baseboard anchor cable 9 are 1860 steel strand of Φ 17.8mm, resin the extensible bolting in stabilizing surrounding rock layer 3, anchor cable pretightning force 120 ~ 150kN; The joist 11 of prestressing force with beam anchor cable 4 adopts U-shaped steel to process, and length L2 is 1671mm; Base angle prestressing force with beam anchor cable 4 is 200 ~ 300mm apart from roadway floor distance h; Concrete 5 thickness d is 200mm, and intensity is C30; Channel-section steel 7 adopts 18# channel-section steel to process; Anchor pole 8 adopts the left-handed nothing of Φ 22 × 3000mm to indulge muscle twisted steel anchor rod, and yield strength is not less than 400MPa; Along vertical working axial direction, adopt channel-section steel 7 that anchor pole 8, anchor cable 9 are linked to be entirety.Stabilizing surrounding rock layer 3, wall rock grouting back-up coat 2 and U-shaped steel bracket 1 couple together by described prestressing force band beam anchor cable 4, and form closed integrated carrying supporting and protection structure with roadway floor supporting and protection structure.
Application process: after tunnel excavates, adopts U-shaped steel bracket 1 pair of roadway's sides and roof rock to carry out supporting in time; Lagging support work plane certain distance sprayed mortar mortar enclosing tunnel surface country rock; After, cranny development relatively stable until deformation of the surrounding rock in tunnel is abundant, carries out tunneling boring roadway surrounding rock grouting and reinforcing, form certain thickness wall rock grouting back-up coat 2; After grout cures, arrangement prestress band beam anchor cable 4 between U-shaped steel bracket 1; Finally, concrete+bolt-mesh-anchor support is carried out to roadway floor, thus form closed integrated carrying supporting and protection structure, and realize the supporting to tunnel.

Claims (8)

1. integrated carrying supporting and protection structure is closed in a mine coal column base plate breaking surrounding rock tunnel, comprise U-shaped steel bracket (1), wall rock grouting back-up coat (2), stabilizing surrounding rock layer (3), prestressing force band beam anchor cable (4) and roadway floor supporting and protection structure, it is characterized in that: described U-shaped steel bracket (1) as basic supporting along tunnel axial equidistant placement, prestressing force band beam anchor cable (4) is arranged along tunnel circumference perpendicular to roadway surrounding rock surface between U-shaped steel bracket (1) as strengthening supporting, single U-shaped steel bracket (1) is connected into an entirety by one end of prestressing force band beam anchor cable (4), its other end is fixed in stabilizing surrounding rock layer (3), described roadway floor supporting and protection structure is by concrete (5), steel mesh reinforcement (6), channel-section steel (7), anchor pole (8) and anchor cable (9) composition, described prestressing force band beam anchor cable (4) is by stabilizing surrounding rock layer (3), wall rock grouting back-up coat (2) and U-shaped steel bracket (1) couple together, and form closed integrated carrying supporting and protection structure with roadway floor supporting and protection structure.
2. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: the material of described U-shaped steel bracket (1) is 36U shaped steel, U-shaped steel bracket (1) array pitch D is 500mm, U-shaped steel bracket (1) lap length L1 is 500 ~ 550mm, and card cable (10) nut pre-fastening moment is 300 ~ 400Nm.
3. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: described wall rock grouting back-up coat (2) thickness is 4000mm, and slip casting strengthening material is cement grout.
4. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: 1860 steel strand that described prestressing force band beam anchor cable (4) and baseboard anchor cable (9) are Φ 17.8mm, resin the extensible bolting in stabilizing surrounding rock layer (3), anchor cable pretightning force 120 ~ 150kN.
5. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: the joist (11) of described prestressing force with beam anchor cable (4) adopts U-shaped steel to process, and length L2 is 1671mm; Base angle prestressing force with beam anchor cable (4) is 200 ~ 300mm apart from roadway floor distance h.
6. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: concrete (5) thickness d in described roadway floor supporting and protection structure is 200mm, and intensity is C30.
7. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: the channel-section steel (7) in described roadway floor supporting and protection structure adopts the processing of 18# channel-section steel.
8. integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel according to claim 1, it is characterized in that: the anchor pole (8) in described roadway floor supporting and protection structure adopts the left-handed nothing of Φ 22 × 3000mm to indulge muscle twisted steel anchor rod, and yield strength is not less than 400MPa; Along vertical working axial direction, adopt channel-section steel (7) that anchor pole (8), anchor cable (9) are linked to be entirety.
CN201510075667.2A 2015-02-12 2015-02-12 Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway CN104675412A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104879127A (en) * 2015-04-24 2015-09-02 中国矿业大学 Method for replacing coal column by floor heaving top connecting
CN105201526A (en) * 2015-11-03 2015-12-30 陈冬冬 Anchor cable and metal support uniting complementing support device and method
CN105569700A (en) * 2016-03-21 2016-05-11 成都理工大学 Anchor steel rope support structure
CN106401605A (en) * 2016-12-16 2017-02-15 安徽理工大学 U-shaped steel reinforced composite anchor net support structure for high-stress soft rock tunnel of deep well and construction method thereof
CN107044287A (en) * 2017-03-06 2017-08-15 刘冲 Colliery shaft station and the reinforcement means of track main entry
CN110424762A (en) * 2019-07-29 2019-11-08 西安建筑科技大学 A kind of cave dwelling hardened system

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JPH0953396A (en) * 1995-08-11 1997-02-25 Shimizu Corp Covering structure of underground cavity, and covering method thereof
JP2007138594A (en) * 2005-11-18 2007-06-07 Gifu Kogyo Co Ltd Placing method for tunnel lining concrete
CN101280684A (en) * 2008-05-12 2008-10-08 淮南矿业(集团)有限责任公司 Goaf surrounding rock around gob-side supporting method under three soft geological condition
CN201254993Y (en) * 2008-07-24 2009-06-10 义马煤业(集团)有限责任公司 O-shaped composite supporting construction for tunnel
CN102373933A (en) * 2011-10-05 2012-03-14 于守东 Resistance-increasing pressure-resisting roadway support
CN102852528A (en) * 2012-04-01 2013-01-02 中国矿业大学 Method for controlling floor heave through inverted arch anchoring beam
CN104153792A (en) * 2014-07-24 2014-11-19 山东大学 Energy-absorption yield tunnel support system and method suitable for weak broken wall rock
CN204457795U (en) * 2015-02-12 2015-07-08 湖南省煤炭地质勘查院 Integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0953396A (en) * 1995-08-11 1997-02-25 Shimizu Corp Covering structure of underground cavity, and covering method thereof
JP2007138594A (en) * 2005-11-18 2007-06-07 Gifu Kogyo Co Ltd Placing method for tunnel lining concrete
CN101280684A (en) * 2008-05-12 2008-10-08 淮南矿业(集团)有限责任公司 Goaf surrounding rock around gob-side supporting method under three soft geological condition
CN201254993Y (en) * 2008-07-24 2009-06-10 义马煤业(集团)有限责任公司 O-shaped composite supporting construction for tunnel
CN102373933A (en) * 2011-10-05 2012-03-14 于守东 Resistance-increasing pressure-resisting roadway support
CN102852528A (en) * 2012-04-01 2013-01-02 中国矿业大学 Method for controlling floor heave through inverted arch anchoring beam
CN104153792A (en) * 2014-07-24 2014-11-19 山东大学 Energy-absorption yield tunnel support system and method suitable for weak broken wall rock
CN204457795U (en) * 2015-02-12 2015-07-08 湖南省煤炭地质勘查院 Integrated carrying supporting and protection structure is closed in mine coal column base plate breaking surrounding rock tunnel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104879127A (en) * 2015-04-24 2015-09-02 中国矿业大学 Method for replacing coal column by floor heaving top connecting
CN104879127B (en) * 2015-04-24 2017-03-15 中国矿业大学 A kind of pucking connects the method that overhead changes coal column
CN105201526A (en) * 2015-11-03 2015-12-30 陈冬冬 Anchor cable and metal support uniting complementing support device and method
CN105569700A (en) * 2016-03-21 2016-05-11 成都理工大学 Anchor steel rope support structure
CN106401605A (en) * 2016-12-16 2017-02-15 安徽理工大学 U-shaped steel reinforced composite anchor net support structure for high-stress soft rock tunnel of deep well and construction method thereof
CN106401605B (en) * 2016-12-16 2019-04-30 安徽理工大学 Deep-well high stress and soft rock mine roadway U-shaped steel enhances composite anchored net supporting construction and its construction method
CN107044287A (en) * 2017-03-06 2017-08-15 刘冲 Colliery shaft station and the reinforcement means of track main entry
CN110424762A (en) * 2019-07-29 2019-11-08 西安建筑科技大学 A kind of cave dwelling hardened system

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Application publication date: 20150603