CN105545321B - A kind of small area blasting mining in thin seam working face gob-side entry retaining support method - Google Patents
A kind of small area blasting mining in thin seam working face gob-side entry retaining support method Download PDFInfo
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- CN105545321B CN105545321B CN201511008424.3A CN201511008424A CN105545321B CN 105545321 B CN105545321 B CN 105545321B CN 201511008424 A CN201511008424 A CN 201511008424A CN 105545321 B CN105545321 B CN 105545321B
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- Prior art keywords
- shaped steel
- face
- canopy
- support
- entry retaining
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/02—Lining predominantly with wood
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Abstract
The invention discloses a kind of small area blasting mining in thin seam working face gob-side entry retaining support methods, small area blasting mining in thin seam works face gob-side entry retaining using H shaped steel shack and timber progress supporting, strengthening supporting is carried out using hydraulic prop, method for protecting support uses following steps: (1) advance support: the advanced blast mining face complement anchor pole in crossheading；Advanced blast mining face sets up H shaped steel shack；(2) Lagging support: I-shaped steel type frame, which is set, to be finished, and lag blast mining face segment frame sets hydraulic prop strengthening supporting；(3) goaf side caving: after blast mining face has returned material, as top plate voluntarily cannot carry out powder charge caving if inbreak.By H shaped steel shack, individual prop, powder charge caving carry out staying lane the present invention.The gob side entry retaining small investment, quick, high efficiency, safety coefficient are high, are to enhance extremely advantageous one of the approach of mine safety production.
Description
Technical field
The present invention relates to field of coal mining, more particularly, to a kind of small area blasting mining in thin seam work face gob-side entry retaining branch
Maintaining method.
Background technique
As central and east coal resources are becoming tight, small area thin seam mining will be increasing.Gob side entry retaining tunnelling rate
It substantially reduces, exploiting field recovery ratio significantly increases, and realizes fast extraction, shortens moving time, prevents island working face from generating, and prevents
The only advantages such as ignition.Gob side entry retaining is compared with having coal column to protect lane, in Technological Economy, production safety, all has advantage.But mesh
Before, the scientific method for protecting support of the blast mining face of small area girdle is not corresponded to, there are security risks for existing support pattern.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention proposes a kind of apply to invest in low-angle dip small area girdle
Less, the high gob-side entry retaining method of quick, high efficiency, safety coefficient.
The present invention adopts the following technical scheme:
A kind of small area blasting mining in thin seam working face gob-side entry retaining support method, small area blasting mining in thin seam working face is along empty
It stays lane to carry out supporting using H shaped steel shack and timber, strengthening supporting is carried out using hydraulic prop, method for protecting support is using such as
Lower step:
(1) advance support: (the advanced of blast mining face answers complement anchor pole at advanced blast mining face 20-25m in crossheading
Power coverage is 20m or so)；Advanced blast mining face sets up H shaped steel shack；
(2) Lagging support: I-shaped steel type frame, which is set, to be finished, and lag blast mining face segment frame sets hydraulic prop and reinforces branch
Shield；
(3) it goaf side caving: after blast mining face has returned material, is put as top plate voluntarily cannot carry out powder charge if inbreak
Top.
Anchor pole array pitch is 1.0-1.2m in the step (1), and four anchor poles of every row, anchor pole specification is 22 × 2000mm of Φ.
The relatively large anchor pole of diameter length, array pitch is relatively large, can obtain preferable Surrounding Rock Control and economic comprehensive effect.
Reality is first looked for by the top in tunnel, side before setting up H shaped steel shack in the step (1).
Keep top beam concordant when setting up H shaped steel shack in the step (1), top is connect on capplce in fact, canopy leg connects on the spot, and front and back is flat
Together；
With the wooden nail jail between two canopies, canopy leg lower part is packed tightly with waste metal net.
Preferably, the canopy of the H shaped steel shack meets Yan Jieshi with timber on capplce away from for 0.8m, and canopy leg is buried to real bottom
In, angle folded by canopy leg capplce is chosen at 8-12 °, apart from angle according to field experience, to obtain optimum efficiency.
Preferably, capplce length, canopy leg height are determined by heading sizes, and the capplce length of the H shaped steel shack is 2.2m,
And installing anti-skidding baffle additional at the 0.20m of both ends；
Canopy leg height is 2.3m, and bottom end adds pedestal；
The timber on top and waist side is connect on capplce, thickness is not less than 0.1m.
Set up twin columns close to goaf side in the step (2), the other side sets up single-column, column away from for 2m, array pitch 0.8m,
Setting load is greater than 90kN.
Blasthole drilling, borehole have two rows, borehole depth 2m, borehole before blast mining face feed back in the step (3)
Array pitch is also 0.8m；
Wherein tier eye distance is 0.1m from top beam, and inclined angle is 85 °；
Another row's hole spacing top beam is 0.2m, and inclined angle is 75 °.
Preferably, described 750 grams of every hole blashole charge, explosive payload can rule of thumb rule be chosen.
The distance of lag blast mining face section hydraulic prop is not less than 40m, hydraulic prop in the step (2)
It does not withdraw temporarily, terminates to start to withdraw hydraulic prop again after mine pressure is stablized after working face extraction.40m, which is converted into, promotes the time
It is 8 days, goaf is stablized at this time.
Using technical solution acquisition of technology effect as above are as follows:
The present invention beats jail with wood support between H shaped steel shack, canopy and canopy by setting up by lane, is connect on capplce with timber and is sternly connect
Real, lower side is helped using waste metal net waist, is lagged section and is made a call to two hydraulic props by goaf side under capplce, the other side is
Single-column carries out strengthening supporting.After having returned material, as top plate voluntarily cannot carry out powder charge caving if inbreak.It is single by H shaped steel shack
Pillar body, powder charge caving carry out staying lane.The gob side entry retaining small investment, quick, high efficiency, safety coefficient are high, enhancing mine peace
Extremely advantageous one of approach is produced entirely.
Specifically:
(1) present invention will make that worker's difficulty of construction is small, easy to operate, simple process, beat anchor pole and super using advanced coal wall
The method of preceding coal wall frame canopy had not only strengthened roadway support but also had been next lane to be stayed to save working hour.
(2) present invention adds timber to combine with individual prop to assemble by H shaped steel shack, both met lane side top plate it is appropriate under
It is heavy again can timely and effectively supporting roof.In lane, side overhead caving cuts off the direct top that goaf side is leaned in tunnel in time, effectively
The pressure that road-in packing is born is reduced, keeps also achieving the closing in goaf, anti-leak-stopping while Drift stability
The spontaneous fire and pernicious gas of wind and coal enter working face.
(3) side is helped using waste metal net waist under H shaped steel shack, realizes the secondary application of material.
(4) application of the invention can make entire exploiting field fully phase out section coal pillar, greatly reduce drivage ratio
While entire working section recovery can be made to improve 15% or so, shorten the time in exploiting field, can generally make to adopt under this condition
Ten thousand tons of drivage ratios in area tunnel reduce by 25% or so.
Detailed description of the invention
Fig. 1 is gob-side entry retaining method arrangement floor map of the present invention.
Fig. 2 is caving eye schematic diagram of the present invention.
Fig. 3 is gob-side entry retaining support method placement-face schematic diagram of the present invention.
In figure,
21: the first boreholes；22: the second boreholes；23: timber；24: capplce；
31: canopy leg；32: anti-skid base；33: hydraulic prop；34: grillage；35: anti-skidding baffle.
Specific embodiment
It is described further in conjunction with 1 to 3 pair of a specific embodiment of the invention of attached drawing:
Double face conceptual design is as shown in Figure 1.
Supporting scheme is as shown in Fig. 2 Fig. 3, process are as follows: first advance 20m complement anchor pole, array pitch 1.0m, every row four
Anchor pole, anchor pole specification are 22 × 2000mm of Φ；Frame canopy, H shaped steel shack first advance coal wall are carried out using the method for advanced coal wall
Distance must not exceed 4m.
Before advanced frame canopy, frame canopy region bottom plate spoil is cleared up using hand fit's pneumatic pick, and the spoil cleaned out is by manually turning
It is transported to former belt feeder transportation system and is delivered to ground, it is necessary to reality be looked for by the top in tunnel, side, to ensure the safety during frame canopy.On
Liang Qian measures head-room, must first be located when not meeting design requirement first, in accordance with middle ray examination drift section width
Reason.
When frame canopy, canopy connects Yan Jieshi, canopy with timber on capplce 24 away from portion of side cash, crag living for 0.8m, is looked for before construction
Leg 31 must bury real bottom, and canopy leg bottom bracket has anti-skid base 32.H shaped steel shack beam length is 2.2m, and apart from both ends
Anti-skidding baffle 35 is processed at 0.20m；Canopy height is 2-2.3m, and bottom end must processing base；The wood on top and waist side is connect on capplce
Material, thickness cannot be less than 0.1m.There should be special messenger to observe frame when frame canopy upper beam, it is oblique to prevent frame, beam is lived using hand rest when setting a roof beam in place
Son, inaccurate handle are placed on beam.To accomplish that Liangping, leg are neat, push up side when frame canopy to connect tightly, the angle that leg, beam combine is controlled in 8-
Between 12 °.
The trapezoidal canopy canopy of I-steel is away from determination: setting the Width of Plastic Zone at coal body edge as S0, then direct top edge roadway direction list
The pressure of bit length are as follows:
Q=(LK+S0)hγ
L in formulaKFor span length, 3.4m；S0For the Width of Plastic Zone at coal body edge, 0.12m；H is direct top thickness, 2m；
γ is balkstone density, and 2.5t/m3 will obtain Q=176kN in each parameter substitution formula, the support force P of every frame canopy takes
300kN, the then spacing of the trapezoidal canopy of I-steel are as follows:
L=P/ (nQ)=0.85m
N is safety coefficient in formula, takes 2.If selecting the spacing of trapezoidal canopy for L=0.8m, actual safety coefficient: n'
=P/QL'=2.1.
Jail is beaten with wood support between canopy and canopy, every frame canopy is no less than 4 support points, two, every side, and lower side uses waste metal
Net waist side prevents the spoil of wall caving, folding side from pouring in main entry.After frame is good, lags section and play two lists by goaf side under capplce
Body hydraulic prop 33, the outer supporting of hydraulic prop have grillage 34, and to carry out strengthening supporting to cylindricality formula, the other side is single list
Body hydraulic prop, column are not less than 90kN away from the setting load for 2.0m, array pitch 0.8m, strengthening supporting.Setting load is generally 50-
70kN is stayed and is suitably increased under the conditions of lane.In addition, setting load is 90kN.That is the top plate of control pillar about 4m upwards.Relative to bog-head coal
For layer, this is direct top range, can inhibit the development of caving zone.For column away from for 2m, this is heading sizes limitation, and array pitch is
0.8m, with canopy away from consistent.
Before working face feed back, old man side is leaned on, the place apart from capplce end 0.1m and 0.2m beats two rows and caunches eye, borehole depth
2.0m, borehole spacing 0.8m, wherein an array pitch is the second borehole 22 from top beam 0.1m, inclined angle is 85 °；Another row
It is the first borehole 21 apart from top beam 0.2m, inclined angle is 75 °.Borehole depth depends on the range directly pushed up, relatively
In girdle, 2m is zone of reasonableness.Field measurement also turns out that zone of reasonableness is 2m.
After having returned material, if top plate cannot voluntarily carry out powder charge caving if inbreak, every explosive payload is 750g, is manually put
Top.
Especially suitable for the shallow coal seam under tight roof, gob side entry retaining produces is gob-side entry retaining method of the present invention
The advantage of small area gently inclined thin seam, tunnelling rate substantially reduce, and exploiting field recovery ratio significantly increases, and realize and quickly return
It adopts, enhances the purpose of mine safety.The present invention adds timber 23 to combine with individual prop to assemble, both met by lane by H shaped steel shack
Top plate it is appropriate sink again can timely and effectively supporting roof.In lane, side overhead caving cuts off tunnel by goaf side in time
It directly pushes up, effectively reduces the pressure that road-in packing is born, keep also achieving goaf while Drift stability
Closing, preventing from leaking out enters working face with the spontaneous fire of coal and pernicious gas.Side uses waste metal net waist under H shaped steel shack
Side, realizes the secondary application of material.
Certainly, described above is only that presently preferred embodiments of the present invention is answered the present invention is not limited to enumerate above-described embodiment
When explanation, anyone skilled in the art is all equivalent substitutes for being made, bright under the guidance of this specification
Aobvious variant, all falls within the essential scope of this specification, ought to be by protection of the invention.
Claims (1)
1. a kind of small area blasting mining in thin seam working face gob-side entry retaining support method, which is characterized in that small area blasting mining in thin seam
Face gob-side entry retaining work using H shaped steel shack and timber progress supporting, strengthening supporting, supporting are carried out using hydraulic prop
Method uses following steps:
(1) advance support: the complement anchor pole at advanced blast mining face 20-25m in crossheading；Advanced blast mining face sets up I-shaped
Steel canopy；Keep top beam concordant when setting up H shaped steel shack, top is connect on capplce in fact, canopy leg connects on the spot, and front and back is concordant；With wood support between two canopies
Stickfast, canopy leg lower part are packed tightly with waste metal net；
Anchor pole array pitch is 1.0-1.2m in the step (1), and four anchor poles of every row, anchor pole specification is 22 × 2000mm of Φ；
Reality is first looked for by the top in tunnel, side before setting up H shaped steel shack in the step (1)；The canopy of the H shaped steel shack away from for 0.8m,
Yan Jieshi is met with timber on capplce, canopy leg is buried into real bottom, and angle folded by canopy leg capplce is at 8-12 °；
The capplce length of the H shaped steel shack is 2.2m, and is installing anti-skidding baffle additional at the 0.20m of both ends；
Canopy leg height is 2.3m, and bottom end adds pedestal；
The timber on top and waist side is connect on capplce, thickness is not less than 0.1m；
(2) Lagging support: I-shaped steel type frame, which is set, to be finished, and lag blast mining face segment frame sets hydraulic prop strengthening supporting；
In the step (2) close to goaf side set up twin columns, the other side set up single-column, column away from be 2m, array pitch 0.8m, just support
Power is greater than 90kN；The distance of lag blast mining face section hydraulic prop is not less than 40m, monomer hydraulic in the step (2)
Pillar is not withdrawn temporarily, terminates to start to withdraw hydraulic prop again after mine pressure is stablized after working face extraction；
(3) goaf side caving: after blast mining face has returned material, as top plate voluntarily cannot carry out powder charge caving if inbreak；
Blasthole drilling, borehole have two rows, borehole depth 2m, row spacing before blast mining face feed back in the step (3)
It is also 0.8m；Wherein tier eye distance is 0.1m from top beam, and inclined angle is 85 °；Another row's hole spacing top beam is
0.2m, inclined angle are 75 °；750 grams of every hole blashole charge.
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| CN201511008424.3A CN105545321B (en) | 2015-12-29 | 2015-12-29 | A kind of small area blasting mining in thin seam working face gob-side entry retaining support method |
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| CN201511008424.3A CN105545321B (en) | 2015-12-29 | 2015-12-29 | A kind of small area blasting mining in thin seam working face gob-side entry retaining support method |
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| CN105545321B true CN105545321B (en) | 2019-01-08 |
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| CN105956929B (en) * | 2016-05-11 | 2019-04-09 | 中国矿业大学 | A kind of method of determining girdle alternate heading cross dimensions |
| CN106640187A (en) * | 2016-12-23 | 2017-05-10 | 济宁矿业集团有限公司霄云煤矿 | Down coal face goaf water dredging structure and dredging method thereof |
| CN106640148B (en) * | 2016-12-27 | 2018-11-30 | 山西晋城无烟煤矿业集团有限责任公司 | Underground coal mine superelevation tunnel permanent reinforcement technique |
| CN108049896B (en) * | 2017-12-19 | 2019-04-02 | 河南力行科创矿山技术开发有限公司 | A kind of fully mechanized coal face gob-side entry retaining method |
| CN109184771B (en) * | 2018-11-20 | 2023-10-24 | 中煤新集能源股份有限公司 | Method for manufacturing flexible shield type reserved return air channel for retracting working face |
| CN109812269A (en) * | 2018-12-27 | 2019-05-28 | 天地科技股份有限公司 | It is a kind of suitable for second mining working face without pillar mining method |
| CN113863956B (en) * | 2021-09-24 | 2023-08-22 | 国家能源集团宁夏煤业有限责任公司 | Coal mine underground working face gateway roadway passing method |
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