CN105422128A - Method for preventing goaf gas leakage in deep shaft gob-side entry driving - Google Patents

Method for preventing goaf gas leakage in deep shaft gob-side entry driving Download PDF

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Publication number
CN105422128A
CN105422128A CN201510924377.0A CN201510924377A CN105422128A CN 105422128 A CN105422128 A CN 105422128A CN 201510924377 A CN201510924377 A CN 201510924377A CN 105422128 A CN105422128 A CN 105422128A
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CN
China
Prior art keywords
curtate
anchor
crossheading
hollow grouting
cable anchor
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Pending
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CN201510924377.0A
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Chinese (zh)
Inventor
刘进晓
尹增德
顾士超
李文鑫
王娟
赵子浩
宗彩建
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Priority to CN201510924377.0A priority Critical patent/CN105422128A/en
Publication of CN105422128A publication Critical patent/CN105422128A/en
Pending legal-status Critical Current

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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
    • E21D11/006Lining anchored in the rock
    • 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
    • E21D11/107Reinforcing elements therefor; Holders for the reinforcing elements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/021Grouting with inorganic components, e.g. cement
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts

Abstract

The invention discloses a method for preventing goaf gas leakage in deep shaft gob-side entry driving, comprising the following steps: punching an anchor cable hole for a coal wall at the outer side of a down trough of an upper section, anchoring a full length grouted anchor in a borehole by using an anchoring agent, installing a metal net, a steel belt and an anchor rope tray at the end part of the full length grouted anchor, and applying pretightening force to the full length grouted anchor; after installation of the full length grouted anchor at the outer side of the down trough of the upper section is finished, spraying a steel fiber flexible concrete spray layer on the outside coal wall of the upper section; after exploitation on a working face of the upper section is finished, transferring to an upside trough of a lower section for tunneling; and carrying out construction on the upside trough of the lower section according to a support sequence consistent to the coal body at one side of the down trough of the upper section. The method is achieved through three main steps of reinforcement of small pillars with two-ended cables, small pillar grouting and spraying of the steel fiber flexible concrete spray layer, so as to effectively prevent gas at the upper section from leaking to cross troughs of the working areas and the goaf, and thus effectively solving the technical problem of leakage of gas in deep high-stress gob-side entry driving.

Description

The anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving
Technical field
The present invention relates to mining well construction technology field, particularly relate to the anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving.
Background technology
Along with to the increase of coal demand and continuing to increase of mining depth, superficial part resource is day by day exhausted, the pit mining degree of depth extends to deep with the speed of the nearly 8 ~ 12m of every annual mean, and along with the increase year by year of the pit mining degree of depth and intensity, China mine enters deep mining in succession.Along with the increase of mining depth, engineering project disaster increases increasingly, as Rock Burst, roadway surrounding rock large deformation, stream become, temperature rise etc., grave danger is caused to the safety and high efficiency of deep resource.Since entering 21 century, gob side entry driving technology obtains to be widelyd popularize, and increasing mine adopts this technology.But along with the increasing of mining depth, gob side entry driving technology also receives huge challenge.
After entering deep, geological structure becomes complicated, selfweight stress increases, and coal and rock have accumulated large energy, under the particular surroundings of " three high disturbances ", the excavate and unload of underground coal and rock causes stress repeatedly to redistribute, and coal and rock destroys the mutability with dynamic response.When fender gob side entry driving implemented by deep-well, fender produces stress and concentrates, and distortion aggravation, its stability receives great threat.In addition, fender is in plasticity completely under high stress, cranny development, if do not taken measures, easily cause the leakage of harmful gas such as the gas in upper curtate goaf in this section tunnel and goaf, cause huge threat to the safety in production of this section.
The method of the fender anti-goaf gas seepage of prior art is generally by common bolt and cable anchor supporting coal column, sprays ordinary concrete at most on fender surface.Under the condition of high ground stress of deep, fender is broken serious, and the anchored force of anchor shaft anchor cable significantly reduces, and anchor pole, failure of cable are serious.The ordinary concrete fragility of spraying is large, and toughness is inadequate and impact strength is poor, produce the condition of large deformation at coal column under, and concrete spray coating serious cracking.Therefore, under deep-well condition of high ground stress, existing fender support technology lacks effective technological means for prevention fender gas seepage, needs further improvement and develops.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide the anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving, to solve the technical problem of deep heavily stressed gob side entry driving gas seepage.
For solving the problems of the technologies described above, the present invention program comprises:
The anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving, it comprises the following steps:
A, under upper curtate, crossheading lateral rib beats anchor cable hole, with Anchor Agent anchor hollow grouting cable anchor in boring, and installs wire lath, steel band and anchor cable pallet in hollow grouting cable anchor end, and to hollow grouting cable anchor applying pretightning force;
B, after the hollow grouting cable anchor installation outside crossheading under upper curtate, rib sprays steel fibre outside upper curtate soft
Property concrete spray coating;
After C, upper curtate work plane have been adopted, proceed to crossheading headwork on lower curtate;
D, on lower curtate in crossheading tunneling process, first the Anchor Agent put by dew on the hollow grouting cable anchor on lower curtate in crossheading is removed, then outside lower curtate, wire lath, steel band and anchor cable pallet are laid in the hollow grouting cable anchor end of rib, pretightning force being applied to hollow grouting cable anchor, being formed fender wearing reinforcing;
E, after the hollow grouting cable anchor installation outside crossheading on lower curtate, outside lower curtate, rib sprays steel fibre flexible concrete spray coating;
F, after crossheading sprays steel fibre flexible concrete spray coating on lower curtate, by hollow grouting cable anchor, grouting and reinforcing is carried out to the fender on crossheading under upper curtate and lower curtate between crossheading.
The anti-goaf gas leakage preventing method of described deep-well gob side entry driving, wherein, in steps A, under described upper curtate, outside crossheading, rib installs hollow grouting cable anchor, described hollow grouting cable anchor head has injected hole, and injected hole has protector, in order to avoid block injected hole in anchoring procedure.
The anti-goaf gas leakage preventing method of described deep-well gob side entry driving, wherein, in steps A, the steel band installed to described hollow grouting cable anchor end, described steel band is W steel band or M steel band, and the hollow grouting cable anchor often arranged is joined together by steel band.
The anti-goaf gas leakage preventing method of described deep-well gob side entry driving, wherein, in step B, under described upper curtate, outside crossheading, rib sprays steel fibre flexible concrete spray coating, described steel fibre flexible concrete spray coating is 20-40mm, the thick steel fibre for 0.5mm for being added to long in ordinary concrete.
The anti-goaf gas leakage preventing method of described deep-well gob side entry driving, wherein, in step D, described fender is section coal pillar width is 3-5m; Described to wearing reinforcing, be same hollow grouting cable anchor, reinforce the fender upper curtate on crossheading and lower curtate between crossheading from two ends.
The anti-goaf gas leakage preventing method of described deep-well gob side entry driving, wherein, in step F, described grouting serous fluid comprises Portland cement and slip casting additive, the water/binder ratio preparation of 0.75:1 pressed by Portland cement slurry, and slip casting additive accounts for 8% ~ 10% of grouting serous fluid weight.
The anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving provided by the invention, fender is reinforced by two-ended cables, fender slip casting and injection steel fibre flexible concrete spray coating three key steps realize, can effectively prevent upper curtate gas from leaking into work section crossheading and goaf, solve the technical problem of deep heavily stressed gob side entry driving gas seepage, a whole set of coal column its support reinforcement method can effectively prevent goaf gas seepage, reduce support material cost, accelerate the support speed of crossheading on lower curtate simultaneously, improve drivage efficiency, the present invention can reduce support material cost simultaneously, accelerate mine support speed, improve drivage efficiency, achieve the target of Technological Economy integration.
Accompanying drawing explanation
Fig. 1 is the structural representation of the work plane of the anti-goaf gas leakage preventing method of deep-well gob side entry driving of the present invention;
Fig. 2 is the construction schematic three dimensional views of the anti-goaf gas leakage preventing method of deep-well gob side entry driving of the present invention;
Wherein: 1, wire lath, 2, steel fibre flexible concrete spray coating, 3, steel band, 4, anchor cable pallet, 5, anchor rope rigging, 6, hollow grouting cable anchor, 7, injected hole, 8, fender, 9, crossheading under upper curtate, 10, crossheading on lower curtate, 11, upper curtate goaf, 12, entity coal.
Detailed description of the invention
The invention provides the anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides the anti-goaf gas leakage preventing method of a kind of deep-well gob side entry driving, as shown in Figures 1 and 2, it comprises the following steps:
A, under upper curtate, crossheading 9 lateral rib beats anchor cable hole, with Anchor Agent anchor hollow grouting cable anchor 6 in boring, and installs wire lath 1, steel band 3 and anchor cable pallet 4 in hollow grouting cable anchor 6 end, and applies pretightning force to hollow grouting cable anchor 6;
B, after hollow grouting cable anchor 6 installation outside crossheading under upper curtate 9, outside upper curtate, 9 ribs spray steel fibre flexible concrete spray coating 2;
After C, upper curtate work plane have been adopted, proceed to crossheading 10 headwork on lower curtate;
D, on lower curtate in crossheading 10 tunneling process, first the Anchor Agent put by dew on the hollow grouting cable anchor 6 on lower curtate in crossheading 10 is removed, then outside lower curtate, wire lath 1, steel band 3 and anchor cable pallet 4 are laid in hollow grouting cable anchor 6 end of rib, pretightning force being applied to hollow grouting cable anchor 6, being formed fender 8 wearing reinforcing;
E, after hollow grouting cable anchor 6 installation outside crossheading on lower curtate 10, outside lower curtate, rib sprays steel fibre flexible concrete spray coating 2;
F, after crossheading 10 sprays steel fibre flexible concrete spray coating 2 on lower curtate, carry out grouting and reinforcing by the fender 8 on crossheading 9 under hollow grouting cable anchor 6 pairs of upper curtates and lower curtate between crossheading 10.
Further, in steps A, under described upper curtate, outside crossheading 9, rib installs hollow grouting cable anchor 6, and described hollow grouting cable anchor 6 head has injected hole 7, and injected hole 7 has protector, in order to avoid block injected hole 7 in anchoring procedure.
And in steps A, the steel band 3 installed to described hollow grouting cable anchor 6 end, described steel band 3 is W steel band or M steel band, and the hollow grouting cable anchor 6 often arranged is joined together by steel band 3, changes surrouding rock stress state and coordinated anchor cable stressed.
In another preferred embodiment of the present invention, in step B, under described upper curtate, outside crossheading, rib sprays steel fibre flexible concrete spray coating 2, described steel fibre flexible concrete spray coating, be 20-40mm, the thick steel fibre for 0.5mm for being added to long in ordinary concrete, steel fibre flexible concrete spray coating improves 54-100% than the tensile strength of ordinary concrete at the same level, and first crack strength improves 160-500%, impact fatigue intensity improves 8-15 doubly, and the dynamic pressure that opposing is adopted in the face of it destroys.And in step D, described fender is section coal pillar width is 3-5m; Described to wearing reinforcing, for same hollow grouting cable anchor 6, reinforce the fender 8 upper curtate on crossheading 9 and lower curtate between crossheading 10 from two ends, thus reduce the quantity that anchor cable uses, solve broken coal stream line anchored force low, the problem of failure of cable simultaneously.In step F, described grouting serous fluid comprises Portland cement and slip casting additive, and the water/binder ratio preparation of 0.75:1 pressed by Portland cement slurry, and slip casting additive accounts for 8% ~ 10% of grouting serous fluid weight.Described grouting serous fluid can select PO32.5 Portland cement to starch, the water/binder ratio preparation of 0.75:1 pressed by cement paste, slip casting additive is ACZ-I type cement injection additive, ACZ-1 additive has the effect of absorption dispersion diminishing, obviously can reduce the viscosity of cement grout, the property noted and the Grouting Seepage in Rockmass that improve cement grout reinforce anti-permeability performance, and ACZ-1 additive can significantly improve cement paste consolidating strength, Seed harvest is made to have early strong, high-strength characteristic, Effect of Grouting can be made to be played as early as possible, prevent gas seepage.
In order to further describe the present invention, below enumerating more detailed embodiment and being described.
Reinforce fender by hollow grouting cable anchor 6 to wearing, crack in fender is closed in injected hole 7 slip casting of hollow grouting cable anchor 6, fender rib sprays the technical measures that steel fibre flexible concrete spray coating 2 forms three layers of main anti-goaf gas seepage, effectively reduce deep-well goaf gas seepage.
Hollow grouting cable anchor 6 is the hollow screw body of rod adopting steel strands wound, is provided with rigidity Grouting Pipe, hollow grouting cable anchor 6 is provided with injected hole 7 in the body of rod.Hollow grouting cable anchor 6 is fixed on fender 8 two ends by pallet 4 and anchor rope rigging 5, the high-tensile characteristic of anchor cable steel strand can be made full use of, realizing there is the coal column on two scope of freedoms to wearing reinforcing, compensate for the anchor pole shortcoming that anchoring effect is not good in the coal body of fragmentation.
Hollow grouting cable anchor specification of the present invention is Φ 20 ~ 22mm, and length is determined according to coal pillar width, according to an array pitch
(800-1500) × (1500-2000) mm arranges, coordinates the pallet 4 of 300mm × 300mm × 16mm to use.Wire lath 1 adopts Ф 6mm, the wire lath of mesh 100 × 100mm, and steel band 3 adopts W type or M steel band of model.Spatially, hollow grouting cable anchor 6 realize to fender 8 two scope of freedoms to wearing reinforcing, complexed metal net 1 and steel band 3, realize the combined supporting to Fragmentation Coal Pillar, as shown in Figure 2, effectively controls coal column deformation instability.
It is two-way to wearing reinforcing that hollow grouting cable anchor 6 of the present invention can not only realize coal column, but also by injected hole 7, adopt high-strength nonshrink injecting paste material, high grouting pressure implements high-strength grouting and reinforcing to coal column.Grouting serous fluid selects PO32.5 Portland cement to starch, and the water/binder ratio preparation of 0.75:1 pressed by cement paste, and adds the ACZ-I type cement injection additive of 8% ~ 10%, grouting pressure 3 ~ 8MP.ACZ-I additive has the effects such as diminishing, microdilatancy, enhancing, overcome the problems such as current grouting serous fluid water/binder ratio is high, intensity is low, curing shrinkage, pumping resistance are large, that can improve cement grout pours into ability, expand slurries filling radius, improve weak, the impervious effect of loose rock mass grouting and reinforcing.And ACZ-I additive can significantly improve cement paste consolidating strength, Seed harvest is made to have early strong, high-strength characteristic, can block by the diffusion of slurries the passage that leaks out be made up of coal column internal crack, crack while effectively controlling coal column distension side, loosening its globality of raising, prevent gas seepage.
In the present invention, the concrete spray coating sprayed in fender 8 both sides is steel fibre flexible concrete spray coating 2, namely on the basis of ordinary concrete, adds 1% steel fibre.When the volume of steel fibre is 1% time, its tensile strength improves 40%, and rupture strength improves 60%, and shear strength improves 50%.The intensity that flexible concrete spray coating can bear is larger, and not easily fragmentation is collapsed, and one is that two is to close rib, prevents the weathering of air and water for the effect of shutoff country rock is played in slip casting.
Its concrete implementation step is as follows:
Step 1: as shown in Figure 1, first under upper curtate in crossheading 9 tunneling process, outside (forming coal column side) to rib drilling, and hanging metal net 1, in order to ensure to determine boring and anchor cable position smoothly when tunneling crossheading 10 on lower curtate, the degree of depth of boring is greater than prearranged pillar width 300mm-500mm.Behind cleaning finishing drilling hole, hollow grouting cable anchor 6 and resin explosive roll are imported boring, anchor cable diameter of phi 20 ~ 22mm, length will be guaranteed to be greater than prearranged pillar width 300mm-500mm.Then agitating resin Anchor Agent, loads onto cone rubber stop grouting plug (conehead inwards), W steel band 3 and pallet 4, then rotates anchor rope rigging 5 and carry out sealing of hole and stretch-draw pretension.
Step 2: under upper curtate after crossheading 9 hollow grouting cable anchor 6, wire lath 1 and steel band 3 installation, rib outside this crossheading is sprayed to the steel fibre flexible concrete spray coating 2 of interpolation 1% steel fibre, sprayed mortar operation lags behind " hollow grouting cable anchor-wire lath-steel band " operation 10 ~ 20m, jetting thickness about 100mm.
Step 3: as shown in Figure 1, after under upper curtate, crossheading 9 has been adopted, on lower curtate in crossheading 10 tunneling process, the coal column removing crossheading 9 side on lower curtate exposes the resin explosive roll of hollow grouting cable anchor 6 end, expose injected hole 7, then according to the supporting sequence construction identical with crossheading under upper curtate 9 side coal body.Hanging metal net on rib, the in-built upper conical rubber stop grouting plug (conehead inwards) of boring, and W steel band and pallet are installed, rotating anchor rope rigging is again fixed on rib by steel band and pallet, and apply certain pretightning force, what now namely complete coal column two scope of freedoms is two-way to wearing reinforcing.
Step 4: at construction complete primary school coal column 8 to after wearing reinforcing, then crossheading 10 coal body side spray penetrates steel fibre flexible concrete spray coating 2 on lower curtate.Sprayed mortar operation lags behind " hollow grouting cable anchor-wire lath-steel band " operation 10 ~ 20m, steel fibre flexible concrete spray coating 2 thickness about 100mm.Eject request evenly, without crack.
Step: 5: after steel fibre flexible concrete spray coating 2 is stable, implement slip casting to fender 8, grouting serous fluid selects PO32.5 Portland cement to starch, and the water/binder ratio preparation of 0.75:1 pressed by cement paste, add ACZ-I type cement injection additive 8% ~ 10%, grouting pressure 3 ~ 8MP.When carrying out high-pressure slip-casting, first unload the plug of hollow grouting cable anchor 6 afterbody, slurry casting machine is connected on the internal thread of hollow grouting cable anchor 6 afterbody, slowly tighten slurry casting machine, by grouting pipeline, slurry casting machine is connected with grouting pump, and check the Grouting Pipe that is connected with grouting pump and casting head whether unimpeded, in slip casting process, each boring should disposablely fill, if stalled midway, may Grouting Pipe be blocked, after slip casting fills first, can grouting pump be closed, wait for 2 ~ 3min slip casting again, until again fill and sealing of hole.As shown in Figure 2, because fender 8 Integral-crushing degree is more serious, the injected hole 7 of hollow grouting cable anchor 6 is evenly distributed on anchor cable, make slurries while being full of boring, realizing full length fastening, spread in boring surrounding rock crack, adhesive solidification effect is played to country rock, prevents the seepage of goaf gas.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this manual; made all equivalently to substitute, obvious variant, within the essential scope all dropping on this manual, protection of the present invention ought to be subject to.

Claims (6)

1. the anti-goaf gas leakage preventing method of deep-well gob side entry driving, it comprises the following steps:
A, under upper curtate, crossheading lateral rib beats anchor cable hole, with Anchor Agent anchor hollow grouting cable anchor in boring, and installs wire lath, steel band and anchor cable pallet in hollow grouting cable anchor end, and to hollow grouting cable anchor applying pretightning force;
B, after the hollow grouting cable anchor installation outside crossheading under upper curtate, outside upper curtate, rib sprays steel fibre flexible concrete spray coating;
After C, upper curtate work plane have been adopted, proceed to crossheading headwork on lower curtate;
D, on lower curtate in crossheading tunneling process, first the Anchor Agent put by dew on the hollow grouting cable anchor on lower curtate in crossheading is removed, then outside lower curtate, wire lath, steel band and anchor cable pallet are laid in the hollow grouting cable anchor end of rib, pretightning force being applied to hollow grouting cable anchor, being formed fender wearing reinforcing;
E, after the hollow grouting cable anchor installation outside crossheading on lower curtate, outside lower curtate, rib sprays steel fibre flexible concrete spray coating;
F, after crossheading sprays steel fibre flexible concrete spray coating on lower curtate, by hollow grouting cable anchor, grouting and reinforcing is carried out to the fender on crossheading under upper curtate and lower curtate between crossheading.
2. the anti-goaf gas leakage preventing method of deep-well gob side entry driving according to claim 1, it is characterized in that, in steps A, under described upper curtate, outside crossheading, rib installs hollow grouting cable anchor, described hollow grouting cable anchor head has injected hole, injected hole has protector, in order to avoid block injected hole in anchoring procedure.
3. anti-goaf gas leakage preventing method according to claim 1, is characterized in that, in steps A, the steel band installed to described hollow grouting cable anchor end, described steel band is W steel band or M steel band, and the hollow grouting cable anchor often arranged is joined together by steel band.
4. the anti-goaf gas leakage preventing method of deep-well gob side entry driving according to claim 1, it is characterized in that, in step B, under described upper curtate, outside crossheading, rib sprays steel fibre flexible concrete spray coating, described steel fibre flexible concrete spray coating is 20-40mm, the thick steel fibre for 0.5mm for being added to long in ordinary concrete.
5. the anti-goaf gas leakage preventing method of deep-well gob side entry driving according to claim 1, is characterized in that, in step D, described fender is section coal pillar width is 3-5m; Described to wearing reinforcing, be same hollow grouting cable anchor, reinforce the fender upper curtate on crossheading and lower curtate between crossheading from two ends.
6. the anti-goaf gas leakage preventing method of deep-well gob side entry driving according to claim 1, it is characterized in that, in step F, described grouting serous fluid comprises Portland cement and slip casting additive, the water/binder ratio preparation of 0.75:1 pressed by Portland cement slurry, and slip casting additive accounts for 8% ~ 10% of grouting serous fluid weight.
CN201510924377.0A 2015-12-14 2015-12-14 Method for preventing goaf gas leakage in deep shaft gob-side entry driving Pending CN105422128A (en)

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CN106884655A (en) * 2017-01-10 2017-06-23 山东建筑大学 A kind of two-way reinforcement means of gob side entry driving coal column
CN107060811A (en) * 2017-06-20 2017-08-18 嘉兴学院 The bracing means of thin coal pillar between a kind of tunnel
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CN110700883A (en) * 2019-09-23 2020-01-17 兖矿新疆矿业有限公司 Gob-side entry driving prevention and control method for large-dip-angle coal seam composite disaster small coal pillar

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CN201972707U (en) * 2010-12-20 2011-09-14 惠兴田 Reinforced concrete gob-side isolation wall of sandwich anchor
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Application publication date: 20160323