CN105735995B - A kind of loose roof cuts the gob-side entry retaining method under top - Google Patents

A kind of loose roof cuts the gob-side entry retaining method under top Download PDF

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Publication number
CN105735995B
CN105735995B CN201610072542.9A CN201610072542A CN105735995B CN 105735995 B CN105735995 B CN 105735995B CN 201610072542 A CN201610072542 A CN 201610072542A CN 105735995 B CN105735995 B CN 105735995B
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China
Prior art keywords
leakage preventing
air leakage
plate
pin air
goaf
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CN201610072542.9A
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Chinese (zh)
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CN105735995A (en
Inventor
刘国明
陈连军
崔向飞
李振
于欣
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings
    • E21F15/02Supporting means, e.g. shuttering, for filling-up materials
    • E21F15/04Stowing mats; Goaf wire netting; Partition walls

Abstract

The invention discloses a kind of loose roof to cut the gob-side entry retaining method under top, and it is aided in into lane by using the pin air leakage preventing device of packaged type, to substitute the concrete filling wall of prior art into lane;Used pin air leakage preventing device is sub-assembly, and be integrally square tubular structure, including upper cap plate, folding wind cloth, hydraulic prop, steel wire and lower footwear plate;Wherein, steel wire is suspended on close to goaf side;Wind cloth is folded to be fixed on close to the side in tunnel.Pin air leakage preventing device synchronously dismounts with the advance of the face and can be moved to another place and reuses, after pin air leakage preventing device removes movement, using to its side expose come rock block form wall on gunite concrete starch, carry out the series technique means such as gap plugging, sealing so that the present invention has the beneficial effects such as laneway molding speed is fast, efficiency high, security are good, concrete filling quantities is small, cost is low relative to prior art.

Description

A kind of loose roof cuts the gob-side entry retaining method under top
Technical field
The present invention relates to a kind of gob-side entry retaining method, more particularly to a kind of loose roof to cut the gob-side entry retaining method under top; Belong to coal mining industrial circle.
Background technology
With the continuous exploitation of first resource coal, this very ripe conventional art of gob side entry retaining, again into The hot research problem of breakthrough and technological innovation is constantly explored, pursued for those skilled in the art.
The method of the gob side entry retaining of early stage mainly promotes with working face extraction, using means such as roadside packings, along mined out Area edge, which is safeguarded, retains former stope drift active workings, so as to cancel protection pillar, is used as lower curtate working face driving along next gob tunnel.
But because supporting wall will be influenceed by adopting twice, supporting wall be easy to occur crack link up it is mined out Area, easily trigger fire, gas explosion accident, and wall maintenance is more difficult, constructs supporting wall and shield lane cost also compares Height, it is serious to restrict edge air gallery technology application and development.
In recent years, as the development of suspension roof support, top plate Qie Dingcheng lane technologies achieve certain in gob side entry retaining field Progress, by the way that to staying lane back to implement Advance presplitting, cut-out back directly pushes up with goaf, base object model contacts, The periodic weighting effect pre- broken face of lower edge collapses disconnected, while direct top-hung is hung under base object model with anchor cable, anchor pole, anchor net etc., prevented Directly top is across falling, so as to save filled wall.
But this gob-side entry retaining method is primarily adapted for carrying out under tight roof.Reason is, under the conditions of tight roof, It is in mainly big biotite gneiss to cut the top plate fallen, cuts the big biotite gneiss fallen and is directly filled in goaf, and directly serves as lane The isolated wall in road is to completely cut off goaf.
But for the gob side entry retaining under the conditions of loose roof, because top plate belongs to crumbly rock, cut backward top plate and break It is broken will be very serious, the less broken spoil of particle diameter is easy to pour into tunnel, even if can be blocked with anchor net, broken spoil is empty Gap easily links up goaf, threatens the production of mine.Therefore, prior art generally uses and builds by laying bricks or stones or construct in goaf side Concrete filling wall, first, for the wall as tunnel, completely cut off goaf;Second, certain auxiliary branch is produced to top plate Support acts on.
In actual production process, concrete filling wall being built by laying bricks or stones or constructing, and is on the one hand that quantities is very huge, Waste time and energy, and filling cost remains high;On the other hand it is that the concrete filling wall under the conditions of this special operation condition is solidifying During Gu, easily there is the problem of wall body slit or cracking, check, safeguard and repair very difficult;What is more important, coagulation The performance of native initial setting strength needs 7 day time, and this directly constrains the fltting speed of coal mining coal-face, turns into restriction The bottleneck that coal production efficiency improves.
For the gob side entry retaining in seam mining under loose roof, how on the premise of ensuring safety in production, accelerate lane The shaping in road, reduce filling cost, improve production efficiency, having become a realistic problem urgently to be resolved hurrily.
The content of the invention
It is an object of the present invention to provide a kind of loose roof to cut the gob-side entry retaining method under top, and it is can recycle The pin air leakage preventing device of movable mounting structure is aided in into lane, substitutes traditional concrete filling wall, its laneway molding speed It hurry up, the technical characterstic such as efficiency high, security are good, concrete filling quantities is small, cost is low.
The present invention is to achieve the above object the technical scheme adopted is that a kind of loose roof cuts the gob side entry retaining side under top Method, it is characterised in that aided in into lane, comprised the following steps that using pin air leakage preventing device:
The first step, tunnel anchor cable/rod and bolting with wire mesh step:
When stope drift active workings tunnel, anchor cable is got on base object model, direct top is hung on base object model, and pine is maintained with anchor net The integrality of soft roof;
Second step, joint-cutting step:
The drilling seam hole along the first advance construction top plate for the goaf side that stope drift active workings, edge will be formed, and Using CUMULATIVE BLASTING presplitting technology, the joint-cutting on top plate;
3rd step, the installation of pin air leakage preventing device, Qie Dingcheng lanes step:
First coal-face often pushes ahead a drilling depth, close to the side of stope drift active workings, is close to joint-cutting installation One pin air leakage preventing device;
So circulation, until first coal-face back production terminates, a number of pin air leakage preventing device head and the tail phase Even;
Above-mentioned first coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase Greatly, under action of underground, loose roof will be cut automatically along joint-cutting, cut the rock block fallen in pin air leakage preventing device Barrier under be filled in the side in goaf;
At the same time, a tunnel is isolated out in the opposite side of pin air leakage preventing device, as second actual mining The stope drift active workings in face;
When carrying out second working face extraction, a drilling depth is often promoted, by first job face progradation central stop lever The erection sequence of air leakage preventing device, that pin air leakage preventing device in preceding installation is removed successively, and be installed in second The side of the close lower crossheading stope drift active workings of individual working face, it is close to joint-cutting installation;
So circulation, until second coal-face back production terminates, a number of pin air leakage preventing device head and the tail phase Even;
Above-mentioned second coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase Greatly, under action of underground, loose roof will be cut automatically along joint-cutting, cut the rock block fallen in pin air leakage preventing device Barrier under be filled in the side in goaf;
In the demolishing process of above-mentioned pin air leakage preventing device, when often removing a pin air leakage preventing device, prevent in pin Leak out device termination with wind cloth seal;And the rock block come is exposed to the side for being removed this pin air leakage preventing device Metope gunite concrete is starched, and by cementing integral, the progress gap plugging of rock block metope, is sealed, to prevent goaf air leaking;
4th step, above-mentioned 3rd step is repeated, until the exploitation of whole exploiting field is completed;
Above-mentioned pin air leakage preventing device is sub-assembly, and be integrally square tubular structure, including upper cap plate, folding wind cloth, list Body hydraulic prop, steel wire and lower footwear plate;Wherein, two planes up and down of upper cap plate and lower footwear plate composition rectangular tube, fold wind The plane of left and right two of cloth and steel wire composition rectangular tube;
Upper cap plate and lower footwear plate are arranged parallel to one on the other, and the piston rod of upper cap plate and hydraulic prop is into removable Unload connection, the base of lower footwear plate and hydraulic prop is into being detachably connected;
The a line of steel wire is suspended on cap plate close on lower footwear plate close to goaf side, another side suspension Goaf side;
The a line for folding wind cloth is fixed on the side in close tunnel on cap plate, and another a line is fixed on lower footwear plate and leaned on The side in nearly tunnel.
The technical effect directly brought by the technical proposal is that may move after, open unload, recyclable Reusability Pin air leakage preventing device is aided in into lane, on the basis of existing technology, eliminates building by laying bricks or stones or constructing for concrete filling wall.
This aspect, greatly reduce concrete filling quantities, time saving and energy saving province's expense;
On the other hand, because the installation required time of pin air leakage preventing device is extremely short, it can effectively ensure that it is immediately right Goaf enters leaking out in tunnel and synchronizes closure, sealing (coordinating concrete grout injection closure, sealing to be caving rock mass wall); Also, the problem of being also avoided that concrete filling wall easy to crack, Inspection and maintenance and maintenance difficult.
That is, barriering efficiency of the tunnel to pernicious gas can be significantly lifted, improves coal production security.
It should be noted that during the advance of the face, each pin air leakage preventing device is merely not only Anti-air-leakage, Also one highly important effect is to carry out " interim " to top plate using monomer hydraulic prop, by upper cap plate, consolidate Supporting role.
That is, before laneway molding, pin air leakage preventing device can both realize the concrete filling of prior art The supporting role of wall, and can realize " Anti-air-leakage " effect that concrete filling wall can play.This namely above-mentioned technology The ingenious part of scheme.
Preferably, the upper surface of above-mentioned upper cap plate and the lower surface of lower footwear plate, further average and are not stained with one layer of polyurethane foam Foam plate.
What the optimal technical scheme was directly brought has the technical effect that, in the upper surface of upper cap plate and the lower surface of lower footwear plate point Not Nian Fu one layer of polyurethane foam board, using polyurethane foam board is flexible, compressible performance, can thoroughly eliminate pin and prevent Leak out the gap of device and top plate and base plate contact surface, it is ensured that do not leak out.
Further preferably, above-mentioned upper cap plate and lower footwear plate are each on that side of goaf side, uniformly weldering respectively It is connected to a number of hook for being used to hang steel wire.
What the optimal technical scheme was directly brought has the technical effect that, is easy to the quick of steel wire to tear open and fill.
Further preferably, above-mentioned loose roof cuts the gob-side entry retaining method under top, also includes sealant tape, described close Sealed adhesive tape is used to seal up the overlapping the slot between end to end two neighboring pin air leakage preventing device.
What the optimal technical scheme was directly brought has the technical effect that, can thoroughly eliminate pin air leakage preventing device and prevent with pin Leak out leaking out a little caused by overlapping the slot that may be present between device, the tunnel for further improving the method for the present invention prevents The ability of goaf air leaking.
Further preferably, the top edge of above-mentioned folding wind cloth is clamped between polyurethane foam board and upper cap plate, folded The lower edge of wind cloth is clamped between polyurethane foam board and lower footwear plate.
What the optimal technical scheme was directly brought has the technical effect that, can effectively protect two sides up and down for folding wind cloth each From neighboring region be not worn or hurt, scratch, extend fold wind cloth service life.
In summary, the present invention is relative to prior art, with laneway molding speed is fast, efficiency high, security are good, coagulation The beneficial effects such as native filling engineering amount is small, cost is low.
Brief description of the drawings
Fig. 1 is the cross section structure schematic diagram in tunnel of the present invention;
Fig. 2 is the plane arrangement structure schematic diagram in tunnel of the present invention;
Fig. 3 is the pin air leakage preventing device axle geodesic structure schematic diagram of the present invention;
Fig. 4 is one of the pin air leakage preventing device decomposition texture schematic diagram of the present invention (mainly showing steel wire side);
Fig. 5 is two (mainly showing to fold wind cloth side) of the pin air leakage preventing device decomposition texture schematic diagram of the present invention;
Fig. 6 is applied in combination one of status architecture schematic diagram for the pin air leakage preventing device of the present invention and (mainly shows steel wire Side);
Fig. 7 (mainly shows to fold wind for status architecture schematic diagram is applied in combination in the pin air leakage preventing device of the present invention two Cloth side).
Description of reference numerals:
1st, polyurethane foam board;2nd, upper cap plate;3rd, hydraulic prop;4th, link up with;5th, steel wire;6th, lower footwear plate;8th, it is close Sealed adhesive tape;11st, wind cloth is folded.
Embodiment
With reference to the accompanying drawings and examples, the present invention is described in detail.As shown in Figure 1 and Figure 2, it is of the invention soft Top plate cuts the gob-side entry retaining method under top, and it uses pin air leakage preventing device auxiliary to be comprised the following steps that into lane:
The first step, tunnel anchor cable/rod and bolting with wire mesh step:
When stope drift active workings tunnel, anchor cable is got on base object model, direct top is hung on base object model, and pine is maintained with anchor net The integrality of soft roof;
Second step, joint-cutting step:
The drilling seam hole along the first advance construction top plate for the goaf side that stope drift active workings, edge will be formed, and Using CUMULATIVE BLASTING presplitting technology, the joint-cutting on top plate;
3rd step, the installation of pin air leakage preventing device, Qie Dingcheng lanes step:
First coal-face often pushes ahead a drilling depth, close to the side of stope drift active workings, is close to joint-cutting installation One pin air leakage preventing device;
So circulation, until first coal-face back production terminates, as shown in Figure 6, Figure 7, a number of pin is prevented The device that leaks out joins end to end;
Above-mentioned first coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase Greatly, under action of underground, loose roof will be cut automatically along joint-cutting, cut the rock block fallen in pin air leakage preventing device Barrier under be filled in the side in goaf;
At the same time, a tunnel is isolated out in the opposite side of pin air leakage preventing device, as second actual mining The stope drift active workings in face;
When carrying out second working face extraction, a drilling depth is often promoted, by first job face progradation central stop lever The erection sequence of air leakage preventing device, that pin air leakage preventing device in preceding installation is removed successively, and be installed in second The side of the close lower crossheading stope drift active workings of individual working face, it is close to joint-cutting installation;
So circulation, until second coal-face back production terminates, as shown in Figure 6, Figure 7, a number of pin is prevented The device that leaks out joins end to end;
Above-mentioned second coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase Greatly, under action of underground, loose roof will be cut automatically along joint-cutting, cut the rock block fallen in pin air leakage preventing device Barrier under be filled in the side in goaf;
In the demolishing process of above-mentioned pin air leakage preventing device, when often removing a pin air leakage preventing device, prevent in pin Leak out device termination with wind cloth seal;And the rock block come is exposed to the side for being removed this pin air leakage preventing device Metope gunite concrete is starched, and by cementing integral, the progress gap plugging of rock block metope, is sealed, to prevent goaf air leaking;
4th step, above-mentioned 3rd step is repeated, until the exploitation of whole exploiting field is completed;
As shown in Figures 3 to 5, above-mentioned pin air leakage preventing device is sub-assembly, and be integrally square tubular structure, including upper cap Plate 2, fold wind cloth 11, hydraulic prop 3, steel wire 5 and lower footwear plate 6;Wherein, upper cap plate 2 and lower footwear plate 6 composition rectangular tube Two planes up and down, fold wind cloth 11 and steel wire 5 form the plane of left and right two of rectangular tube;
Upper cap plate 2 and lower footwear plate 11 are arranged parallel to one on the other, the piston rod of upper cap plate 2 and hydraulic prop 3 Into being detachably connected, the base of lower footwear plate 6 and hydraulic prop 3 is into being detachably connected;
The a line of steel wire 5 is suspended on cap plate 2 close to goaf side, and another side suspension is on lower footwear plate 6 Close to goaf side;
The a line for folding wind cloth 11 is fixed on the side in close tunnel on cap plate 2, and another a line is fixed on lower footwear plate 6 The side in upper close tunnel.
To ensure the seamless connection between pin air leakage preventing device and top plate and bottom plate, elimination is leaked out, above-mentioned upper cap plate 2 Upper surface and the lower surface of lower footwear plate 6, further average and are not stained with one layer of polyurethane foam board 1.
In place, above-mentioned upper cap plate 2 and lower footwear plate 6 are each close to goaf for fast quick-detach and assembling for ease of steel wire 5 On that side of side, uniform welding has a number of hook 4 for being used to hang steel wire 5 respectively.
Above-mentioned loose roof cuts the gob-side entry retaining method under top, also includes sealant tape 8, above-mentioned sealant tape is used for Overlapping the slot between end to end two neighboring pin air leakage preventing device is sealed up.
The top edge of above-mentioned folding wind cloth 11 is clamped between polyurethane foam board 1 and upper cap plate 2, folded under wind cloth Edge is clamped between polyurethane foam board 1 and lower footwear plate 6.
Embodiment 1
By taking certain working face of ore deposit 2208 as an example, strike length 862m, tilt length 167m, working seam 8OnCoal, bury Deep H=610-750m, coal seam thickness 1.65-3.35m, average 2.67m, 1 ° -5 ° of seam inclination are average 2 °.
Directly top is mud stone, packsand, siltstone, belongs to II class unstable roof, average thickness 2.35m.
Base object model belongs to II class base object model, is mainly made up of gritstone, packsand, siltstone, average thickness 5.86m;Coal The layer unidirectional compression strength of balkstone is 19.78MPa, and unidirectional tensile strength divides 0.96MPa, low intensity, belongs to soft stratum.
Using retrusive comprehensive mechanical coal mining.
Working face extraction drift section is rectangle, and its size is 4.6m × 2.6m (clear span × clear height),
Gob-side entry retaining method:
The first step, tunnel anchor cable/rod and bolting with wire mesh step:
When crossheading stope drift active workings tunnel under 2208 working faces, anchor cable is got on base object model, direct top is hung in base object model On, and with anchor net maintain loose roof integrality;
Second step, joint-cutting step:
The drilling seam hole along the first advance construction top plate for the goaf side that stope drift active workings, edge will be formed, and Using CUMULATIVE BLASTING presplitting technology, the joint-cutting on top plate;
3rd step, the installation of pin air leakage preventing device, Qie Dingcheng lanes step:
2208 working faces often push ahead a drilling depth, close to the side of stope drift active workings, are close to joint-cutting and install a gear Bar air leakage preventing device;
So circulation, until 2208 coal-face back production terminate, a number of pin air leakage preventing device joins end to end;
Above-mentioned 2208 working face constantly push ahead during, top plate goaf it is outstanding show up product increase, in ore deposit Under the effect of mountain pressure, loose roof will be cut automatically along joint-cutting, cut the barrier of the rock block that falls in pin air leakage preventing device Under be filled in the side in goaf;
At the same time, a tunnel is isolated out in the opposite side of pin air leakage preventing device, as second back production 2210 The stope drift active workings of working face;
When carrying out 2210 working face extraction, a drilling depth is often promoted, by 2208 advance of the face process central stop lever leakproofs The erection sequence of wind apparatus, that pin air leakage preventing device in preceding installation is removed successively, and be installed in 2210 work The side of the close lower crossheading stope drift active workings in face, it is close to joint-cutting installation;
So circulation, until 2210 working face extractions terminate, a number of pin air leakage preventing device joins end to end;
Above-mentioned 2210 working face constantly push ahead during, top plate goaf it is outstanding show up product increase, in ore deposit Under the effect of mountain pressure, loose roof will be cut automatically along joint-cutting, cut the barrier of the rock block that falls in pin air leakage preventing device Under be filled in the side in goaf;
In the demolishing process of above-mentioned pin air leakage preventing device, when often removing a pin air leakage preventing device, prevent in pin Leak out device termination with wind cloth seal;And the rock block come is exposed to the side for being removed this pin air leakage preventing device Gunite concrete is starched on the wall of composition, gap plugging, sealing is carried out, to prevent goaf air leaking;
4th step, above-mentioned 3rd step is repeated, until the exploitation of whole exploiting field is completed.
Using the gob-side entry retaining method of the present invention, the mine essentially identical or similar with original mining conditions is used in lane The construction method contrast of concrete filling wall is constructed or built by laying bricks or stones on side:
Coal mining efficiency improves about 20%, and filling cost reduces about 80%, and ton coal production cost reduces about 3-5%;
Also, the concrete filling operating personnel of required outfit reduce 2-3 names, the labor intensity of worker also significantly drops It is low.

Claims (5)

1. a kind of loose roof cuts the gob-side entry retaining method under top, it is characterised in that aided in using pin air leakage preventing device into lane, Comprise the following steps that:
The first step, tunnel anchor cable/rod and bolting with wire mesh step:
When stope drift active workings tunnel, anchor cable is got on base object model, direct top is hung on base object model, and soft top is maintained with anchor net The integrality of plate;
Second step, joint-cutting step:
In stope drift active workings, the drilling seam hole along the first advance construction top plate for the goaf side that will be formed, and use CUMULATIVE BLASTING presplitting technology, the joint-cutting on top plate;
3rd step, the installation of pin air leakage preventing device, Qie Dingcheng lanes step:
First coal-face often pushes ahead a drilling depth, close to the side of stope drift active workings, is close to joint-cutting and installs one Pin air leakage preventing device;
So circulation, until first coal-face back production terminates, a number of pin air leakage preventing device joins end to end;
Above-mentioned first coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase, Under action of underground, loose roof will be cut automatically along joint-cutting, cut the resistance of the rock block that falls in pin air leakage preventing device The side in goaf is filled under;
At the same time, a tunnel is isolated out in the opposite side of pin air leakage preventing device, as second stope Stope drift active workings;
When carrying out second working face extraction, a drilling depth is often promoted, by the progradation central stop lever leakproof of first job face The erection sequence of wind apparatus, that pin air leakage preventing device in preceding installation is removed successively, and be installed in second work Make the side of the close lower crossheading stope drift active workings in face, be close to joint-cutting installation;
So circulation, until second coal-face back production terminates, a number of pin air leakage preventing device joins end to end;
Above-mentioned second coal-face constantly push ahead during, top plate goaf it is outstanding show up product increase, Under action of underground, loose roof will be cut automatically along joint-cutting, cut the resistance of the rock block that falls in pin air leakage preventing device The side in goaf is filled under;
In the demolishing process of above-mentioned pin air leakage preventing device, when often removing a pin air leakage preventing device, in pin Anti-air-leakage The termination of device is sealed with wind cloth;And the rock block metope come is exposed to the side for being removed this pin air leakage preventing device Gunite concrete is starched, and by cementing integral, the progress gap plugging of rock block metope, is sealed, to prevent goaf air leaking;
4th step, above-mentioned 3rd step is repeated, until the exploitation of whole exploiting field is completed;
Above-mentioned pin air leakage preventing device is sub-assembly, and be integrally square tubular structure, including upper cap plate, folding wind cloth, monomer liquid Press pillar, steel wire and lower footwear plate;Wherein, upper cap plate and lower footwear plate composition rectangular tube two planes up and down, fold wind cloth and Steel wire forms the plane of left and right two of rectangular tube;
Upper cap plate and lower footwear plate are arranged parallel to one on the other, and the piston rod of upper cap plate and hydraulic prop is into detachably connecting Connect, the base of lower footwear plate and hydraulic prop is into being detachably connected;
The a line of steel wire is suspended on cap plate close to goaf side, and another side suspension is on lower footwear plate close to mined out Area side;
The a line for folding wind cloth is fixed on close to the side in tunnel on cap plate, and another a line is fixed on lower footwear plate close to lane The side in road.
2. loose roof according to claim 1 cuts the gob-side entry retaining method under top, it is characterised in that the upper cap plate Upper surface and the lower surface of lower footwear plate, are also stained with one layer of polyurethane foam board respectively.
3. loose roof according to claim 1 cuts the lower gob-side entry retaining method in top, it is characterised in that the upper cap plate with Lower footwear plate is each on that side of goaf side, and uniform welding has a number of extension for being used to hang steel wire respectively Hook.
4. loose roof according to claim 1 cuts the gob-side entry retaining method under top, it is characterised in that also includes sealing Adhesive tape, the sealant tape are used to seal up the overlapping the slot between end to end two neighboring pin air leakage preventing device.
5. loose roof according to claim 2 cuts the gob-side entry retaining method under top, it is characterised in that the folding wind cloth Top edge be clamped between polyurethane foam board and upper cap plate, the lower edge that folds wind cloth is clamped in polyurethane foam board Between lower footwear plate.
CN201610072542.9A 2016-02-02 2016-02-02 A kind of loose roof cuts the gob-side entry retaining method under top Expired - Fee Related CN105735995B (en)

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