WO2019205227A1 - 一种急倾斜煤层的柔性掩护支架采煤法 - Google Patents
一种急倾斜煤层的柔性掩护支架采煤法 Download PDFInfo
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- WO2019205227A1 WO2019205227A1 PCT/CN2018/089266 CN2018089266W WO2019205227A1 WO 2019205227 A1 WO2019205227 A1 WO 2019205227A1 CN 2018089266 W CN2018089266 W CN 2018089266W WO 2019205227 A1 WO2019205227 A1 WO 2019205227A1
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- flexible shield
- coal
- support
- coal mining
- water injection
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- 239000003245 coal Substances 0.000 title claims abstract description 114
- 238000005065 mining Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 239000000428 dust Substances 0.000 claims abstract description 4
- 238000005422 blasting Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 3
- 239000002360 explosive Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Definitions
- the invention discloses a coal mining method, in particular to a flexible shield support coal mining method for a steeply inclined coal seam.
- a flexible shield support coal mining method which comprises the following steps:
- each of the flexible shield brackets comprises an upper branch, a frame back and a lower branch which are sequentially connected, and the upper branch, the back of the frame and the lower branch are mounted by bolts, and the bolts are upper and lower,
- a steel wire rope is respectively installed between the splint and the upper support, the back of the frame and the lower support, and the wire rope is fixed between the two bolts and fastened by the clamp plate.
- the clamping plate (5) is inclined with respect to the longitudinal direction of the bottom plate (10), and the inclination angle is 30°-45°.
- each set of wire rope joints is staggered.
- the spacing between any two adjacent water injection holes in the step S2 is 5 meters, and the water injection hole depth is greater than the length of the dust-injection water sealing device by 1.5 meters to 3 meters.
- the blasting area is 5 meters long, one row per meter, two rows of blastholes per row, each blasthole depth is 0.8 meters, and the distance between the two blastholes in each row is 0.8 meters to 1.0 meters, making full use of the single hydraulic props. The flexibility is shifted.
- the upper support of the support frame is supported by the single hydraulic support column when moving the flexible shield bracket in the direction of the top plate, and the coal is supported under the armpit; the hydraulic support column is used when moving the flexible shield frame toward the bottom direction. Support the lower branch of the bracket and support the coal.
- the angle between the upper support and the back of the flexible cover is 140°, the angle between the lower support and the back of the frame is 135°, and the length of the upper support is 500 mm;
- the flexible shield includes a thin coal seam flexible shield and Thick coal seam flexible shield bracket, when the coal seam thickness is below 2.3m, the thin coal seam flexible shield bracket is used.
- the thick coal seam flexible shield bracket is used, and the thin coal seam flexible shield bracket single frame back
- the length is 850mm, the length of the lower branch is 450mm, the distance from the end of the upper branch to the end of the lower branch is 2800mm; the length of the upper cover of the thick coal seam flexible shield bracket is 900mm, the length of the back of the frame is 1200mm, and the length of the lower branch is 950mm.
- the distance from the end of the branch to the end of the lower leg is 2800 mm.
- the dust-reducing water injection sealing device in the step S2 comprises a water inlet joint, the water inlet joint is connected with one end of the expansion hose, the other end of the expansion hose is connected with the nozzle, and the one-way ball valve and the pressure are installed in the nozzle Adjust the spring.
- the invention has the beneficial effects that the flexible shield support coal mining method for the steeply inclined coal seam according to the present invention greatly increases the coal mining efficiency in the coal mining process in the steeply inclined coal seam by installing the flexible shield support.
- the safety of the worker is improved, and the shield bracket is reasonable in structure, convenient to install, and easy to maintain.
- a dust water sealer By installing a dust water sealer, the dust generated during the production process is less and the working environment becomes better.
- FIG. 1 is a schematic view showing the structure of a flexible shield support coal mining method for a steeply inclined coal seam according to the present invention
- Figure 2 is a perspective view of a perspective structure of Figure 1;
- Figure 3 is a schematic cross-sectional view of Figure 1;
- Figure 4 is a partially enlarged schematic view of Figure 1;
- Figure 5 is a schematic perspective view of the coal mining face
- Figure 6 is a schematic structural view of the flexible shield bracket
- Figure 7 is a schematic structural view of the dust-reducing water injection sealing device
- the method for mining a flexible shield support for a steeply inclined coal seam comprises the following steps:
- each of the flexible shield brackets 1 comprises an upper bracket 2, a shelf back 3, and a lower bracket 4 which are sequentially connected, and the upper bracket 2, the shelf back 3 and the lower bracket 4 are mounted by a bolt 7
- the bolts 7 are upper and lower, and the steel wire rope 6 is respectively installed between the clamp plate 5 and the upper support 2, the frame back 3 and the lower support 4, and the wire rope 6 is fixed between the two bolts 7 and fastened by the clamp plate 5.
- the coal mining face 8 is blasted; a blasting zone is set at the coal mining face 8, and the blasting zone 15 is fired, and the depth direction of the blasthole 15 is maintained at an angle of 65°-70° with the coal mining face 8
- the blasthole 15 is filled with explosives, and the blasting area is blasted, and after blasting, it enters the coal mining face 8 for coal boring operation.
- the splint 5 in the step S1 is inclined with respect to the longitudinal direction of the bottom plate 10, and the inclination angle is 30°-45°.
- the spacing between any two adjacent water injection holes 14 in step S2 is 5 meters, and the depth of the water injection hole 14 is greater than the length of the dust-injection water sealing device 12 by 1.5 meters to 3 meters.
- step S3 the blasting area is 5 meters long, one row per meter, two blastholes 15 per row, each blasthole 15 has a depth of 0.8 meters, and the distance between the two blastholes 15 of each row is 0.8 meters to 1.0 meters, making full use of the single pillars. The flexibility is shifted.
- step S3 When the coal blasting operation is performed in step S3, when the flexible shield 1 is moved toward the top plate 9, the upper support 2 of the support is supported by the single hydraulic support column 11, and the coal is supported under the armpit; and the flexible shield is moved toward the bottom plate 10
- the hydraulic support column 11 supports the lower branch 4 of the bracket and supports the coal.
- the upper bracket 2 of the flexible shield bracket 1 has an angle of 140° with the back of the rack 3, the angle between the lower branch 4 and the back of the rack 3 is 135°, and the length of the upper branch 2 is 500 mm; the flexible shield bracket 1 Including thin coal seam flexible shield bracket and thick coal seam flexible shield bracket, when the coal seam thickness is below 2.3m, the thin coal seam flexible shield bracket is used.
- the thick coal seam flexible shield bracket When the coal seam thickness is 2.3m or more, the thick coal seam flexible shield bracket is used, the thin coal seam
- the length of the flexible cover bracket single frame back 3 is 850mm, the length of the lower support 4 is 450mm, the distance from the end of the upper branch 2 to the end of the lower branch 4 is 2800mm; the length of the upper cover of the thick coal seam flexible shield bracket is 900mm,
- the back of the frame 3 has a length of 1200 mm, the length of the lower leg 4 is 950 mm, and the distance from the end of the upper leg 2 to the end of the lower leg 4 is 2800 mm.
- the dust-removing water-filling sealer 12 in the step S2 includes a water inlet joint 16 connected to one end of the expansion hose 17, and the other end of the expansion hose 17 is connected to the nozzle 18, and the nozzle 18 is installed inside.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
一种急倾斜煤层的柔性掩护支架采煤法,包括安装柔性掩护支架(1)、采煤工作面(8)煤壁注水、采煤工作面爆破、拆卸柔性掩护支架。通过安装柔性掩护支架使在急倾斜煤层的采煤过程中,增加了采煤效率,提高了工人的安全性,而且掩护支架结构合理、安装方便、便于维护。通过安装降尘注水封孔器(12),使在生产过程中产生的粉尘更少,工作环境变好。
Description
本发明公开了一种采煤方法,具体涉及一种急倾斜煤层的柔性掩护支架采煤法。
在进行急倾斜煤层的采煤过程中,随着矿井开采的深度逐渐加深,对于掘进面进行支撑,制造一个安全的采煤区域是很重要的一部分;通常在进行掘进区域的支撑方式为液压柱支撑,对掘进区域及巷道顶部通过支撑板等进行支撑,但随着工作面的加长,顶煤控制难度加大,支架容易失稳倒架的问题尤为严重,工作面生产瘫痪导致掘进工作停滞,且存在安全隐患,不利于工作面的恢复和安全生产,目前在对急倾斜煤层进行开采时需要一种安全高效的采煤法。
发明内容
本发明的目的在于提供一种急倾斜煤层的柔性掩护支架采煤法,以解决上述背景技术中提出的现有技术的不足,该装置能够通过柔性掩护支架将急倾斜煤层采煤区域进行支撑,提供生产的安全性及生产效率。
为了实现上述目的,本发明采取的技术方案是:一种柔性掩护支架采煤法,其特征在于,包括以下步骤:
S1、安装柔性掩护支架;每个柔性掩护支架单体包括依次连接的上支、架背、下支,所述上支、架背和下支通过螺栓安装夹板,所述螺栓为上下两个,夹板与上支、架背和下支之间分别安装钢丝绳,钢丝绳固定在两颗螺栓之间并通过夹板紧固。将多个所述柔性掩护支架单体沿采煤工作面长度延伸方向依次排列,用所述夹板和所述螺栓将依次排列的多个所述柔性掩护支架单体用钢丝绳进行固定; 所述柔性掩护支架单体的上支顶部与顶板相接,下支底部与底板相接,所述上支和所述底板之间设有用于支撑柔性掩护支架的单体液压支撑柱;柔性掩护支架和单体液压支撑柱安装完后使采煤工作面与水平面22呈25°-30°内夹角,用柔性掩护支架1隔空采空区,工人在掩护支架下采煤。
S2、采煤工作面煤壁注水;由于煤层松软容易产生煤尘,在采煤工作面上采用降尘注水封孔器注水措施,在工作面上支之间设置注水管,注水管上设有阀门20,注水管末端设有降尘注水封孔器,采煤工作面8设有注水孔,煤层注水时将降尘注水封孔器插入注水孔,打开注水管阀门20进行注水。
S3、采煤工作面爆破;在采煤工作面设置爆破区,对所述爆破区进行打炮眼,炮眼深度延伸方向与采煤工作面保持65°-70°内夹角,向炮眼内填充炸药,对上述爆破区进行爆破,爆破后进入采煤工作面进行扒煤作业。
S4、拆卸柔性掩护支架;随着采煤工作面的推进,及时拆除尾部多余的柔性掩护支架单体,逐根回收,柔性掩护支架架尾悬挂警示牌。
所述步骤S1中夹板(5)相对底板(10)长度方向倾斜放置,倾斜角为30°-45°。
所述步骤S1中各组钢丝绳接头错开。
所述步骤S2中任意相邻两个所述注水孔之间的间距为5米,注水孔深度大于降尘注水封孔器长度1.5米至3米。
所述步骤S3中爆破区长5米,每米一排,每排两个炮眼,每个炮眼深度为0.8米,每排的两个炮眼间距为0.8米至1.0米,充分利用单体液压支柱的伸缩性进行移架。
所述步骤S3中进行扒煤作业时,向顶板方向移动柔性掩护支架时用单体液压 支撑柱支撑支架的上支,扒下支煤;向底方向移动柔性掩护架时用单体液压支撑柱支撑支架的下支,扒上支煤。
所述柔性掩护支架的所述上支与架背内夹角为140°,下支与架背内夹角为135°,上支长度为500mm;所述柔性掩护支架包括薄煤层柔性掩护支架和厚煤层柔性掩护支架,当煤层厚度在2.3m以下时使用薄煤层柔性掩护支架,当煤层厚度在2.3m或2.3m以上时使用厚煤层柔性掩护支架,所述薄煤层柔性掩护支架单体架背长度为850mm,下支长度为450mm,上支的端部到下支的端部距离为2800mm;厚煤层柔性掩护支架单体上支长度为900mm,架背长度1200mm,下支长度为950mm,上支的端部到下支的端部距离为2800mm。
所述步骤S2中所述降尘注水封孔器包括进水接头,进水接头与膨胀软管的一端连接,所述膨胀软管的另一端与喷嘴连接,所述喷嘴内安装单向球阀和压力调整弹簧。
本发明的有益效果是:本发明所述的一种急倾斜煤层的柔性掩护支架采煤法,通过安装柔性掩护支架使在急倾斜煤层的采煤过程中,极大的增加了采煤效率,提高了工人的安全性,而且该掩护支架结构合理、安装方便、便于维护。通过安装尘注水封孔器,使在生产过程中产生的粉尘更少,工作环境变好。
图1是本发明所述一种急倾斜煤层的柔性掩护支架采煤法结构示意图;
图2是图1的一种立体结构示意图;
图3是图1剖面结构示意图;
图4是图1局部放大结构示意图;
图5是所述采煤工作面立体结构示意图;
图6是所述柔性掩护支架结构示意图;
图7是所述降尘注水封孔器结构示意图;
附图标记:1柔性掩护支架、2上支、3架背、4下支、5夹板、6钢丝绳、7螺栓、8采煤工作面、9顶板、10底板、11液压支撑柱、12降尘注水封孔器、13注水管、14注水孔、15炮眼、16进水接头、17膨胀软管、18喷嘴、19单向球阀、20阀门、21钢丝绳接头、22水平面、23压力调整弹簧。
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用与限定本发明。
本发明所述一种急倾斜煤层的柔性掩护支架采煤法,包括以下步骤:
S1、安装柔性掩护支架1;每个柔性掩护支架1单体包括依次连接的上支2、架背3、下支4,所述上支2、架背3和下支4通过螺栓7安装夹板,所述螺栓7为上下两个,夹板5与上支2、架背3和下支4之间分别安装钢丝绳6,钢丝绳6固定在两颗螺栓7之间并通过夹板5紧固。将多个所述柔性掩护支架1单体沿采煤工作面8长度延伸方向依次排列,用所述夹板5和所述螺栓7将依次排列的多个所述柔性掩护支架1单体用钢丝绳6进行固定;所述柔性掩护支架1单体的上支2顶部与顶板9相接,下支4底部与底板10相接,所述上支2和所述底板10之间设有用于支撑柔性掩护支架1的单体液压支撑柱11;柔性掩护支架1和单体液压支撑柱11安装完后使采煤工作面8与水平面22呈25°-30°内夹角,用柔性掩护支架1隔空采空区,工人在柔性掩护支架1下采煤。
S2、采煤工作面8煤壁注水;由于煤层松软容易产生煤尘,在采煤工作面8 上采用降尘注水封孔器12注水措施,在工作面上支2之间设置注水管13,注水管13上设有阀门20,注水管13末端设有降尘注水封孔器12,采煤工作面8设有注水孔14,煤层注水时将降尘注水封孔器12插入注水孔14,打开注水管阀门20进行注水。
S3、采煤工作面8爆破;在采煤工作面8设置爆破区,对所述爆破区进行打炮眼15,炮眼15深度延伸方向与采煤工作面8保持65°-70°内夹角,向炮眼15内填充炸药,对上述爆破区进行爆破,爆破后进入采煤工作面8进行扒煤作业。
S4、拆卸柔性掩护支架1;随着采煤工作面8的推进,及时拆除尾部多余的柔性掩护支架1单体,逐根回收,柔性掩护支架1架尾悬挂警示牌。
如图3所示,为使夹板更好的紧固钢丝绳6,所述步骤S1中所述夹板5相对底板10长度方向倾斜放置,所述倾斜角为为30°-45°。
所述柔性掩护支架单体上竖直方向安装四排钢丝绳6,所述每排钢丝绳接头21水平错开,避免不同排钢丝绳接头21出现在同根柔性掩护支架单体,因为钢丝绳接头21处是所述柔性掩护支架1拉力的薄弱点,如果一根柔性掩护支架单体有多个钢丝绳接头,则有可能使钢丝绳接头21断开。
如图5所示,步骤S2中任意相邻两个所述注水孔14之间的间距为5米,注水孔14深度大于降尘注水封孔器12长度1.5米至3米。
步骤S3中爆破区长5米,每米一排,每排两个炮眼15,每个炮眼15深度为0.8米,每排的两个炮眼15间距为0.8米至1.0米,充分利用单体支柱的伸缩性进行移架。
步骤S3中进行扒煤作业时,向顶板9方向移动柔性掩护支架1时用单体液压支撑柱11支撑支架的上支2,扒下支煤;向底板10方向移动柔性掩护架时用单体 液压支撑柱11支撑支架的下支4,扒上支煤。
所述柔性掩护支架1的所述上支2与架背3内夹角为140°,下支4与架背3内夹角为135°,上支2长度为500mm;所述柔性掩护支架1包括薄煤层柔性掩护支架和厚煤层柔性掩护支架,当煤层厚度在2.3m以下时使用薄煤层柔性掩护支架,当煤层厚度在2.3m或2.3m以上时使用厚煤层柔性掩护支架,所述薄煤层柔性掩护支架单体架背3长度为850mm,下支4长度为450mm,上支2的端部到下支4的端部距离为2800mm;厚煤层柔性掩护支架单体上支2长度为900mm,架背3长度1200mm,下支4长度为950mm,上支2的端部到下支4的端部距离为2800mm。
所述步骤S2中降尘注水封孔器12包括进水接头16,进水接头16与膨胀软管17的一端连接,所述膨胀软管17的另一端与喷嘴18连接,所述喷嘴18内安装单向球阀19和压力调整弹簧23。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内做做的任何修改、等同替换和改进等,均包含在本发明的保护范围之内。
Claims (8)
- 一种急倾斜煤层的柔性掩护支架采煤法,其特征在于,包括以下步骤:S1、安装柔性掩护支架(1);每个柔性掩护支架(1)单体包括依次连接的上支(2)、架背(3)、下支(4),所述上支(2)、架背(3)和下支(4)内侧面通过螺栓(7)安装夹板(5),所述螺栓(7)为上下两个,夹板(5)与上支(2)、架背(3)和下支(4)之间分别安装钢丝绳(6),钢丝绳(6)固定在两颗螺栓(7)之间并通过夹板(5)紧固。将多个所述柔性掩护支架(1)单体沿采煤工作面(8)长度延伸方向依次连接,用所述夹板(5)和所述螺栓(7)将依次排列的多个所述柔性掩护支架(1)单体用钢丝绳(6)进行固定;所述柔性掩护支架(1)单体的上支(2)顶部与顶板(9)相接,下支(4)底部与底板(10)相接,所述上支(2)和所述底板(10)之间设有用于支撑柔性掩护支架(1)的单体液压支撑柱(11);柔性掩护支架(1)和单体液压支撑柱(11)安装完后使采煤工作面(8)与水平面22呈25°-30°内夹角,用柔性掩护支架(1)隔空采空区,工人在掩护支架下采煤。S2、采煤工作面(8)煤壁注水;由于煤层松软容易产生煤尘,在采煤工作面(8)上采用降尘注水封孔器(12)注水措施,在工作面上支(2)之间设置注水管(13),注水管(13)上设有阀门(20),注水管(13)末端设有降尘注水封孔器(12),采煤工作面(8)设有注水孔(14),煤层注水时将降尘注水封孔器(12)插入注水孔(14),打开注水管阀门(20)进行注水。S3、采煤工作面(8)爆破;在采煤工作面(8)设置爆破区,对所述爆破区进行打炮眼(15),炮眼(15)深度延伸方向与采煤工作面(8)保持65°-70°内夹角,向炮眼(15)内填充炸药,对上述爆破区进行爆破,爆破后进入采煤工作面(8)进行扒煤作业。S4、拆卸柔性掩护支架(1);随着采煤工作面(8)的推进,及时拆除尾部多余的柔性掩护支架(1)单体,逐根回收,柔性掩护支架(1)架尾悬挂警示牌。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,步骤S1中所述夹板(5)相对底板(10)长度方向倾斜放置,倾斜角为30°-45°。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,所述步骤S1中 各组钢丝绳接头(21)错开。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,步骤S2中任意相邻两个所述注水孔(14)之间的间距为5米,注水孔(14)深度大于降尘注水封孔器(12)长度1.5米至3米。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,步骤S3中爆破区长5米,每米一排,每排两个炮眼(15),每个炮眼(15)深度为0.8米,每排的两个炮眼(15)间距为0.8米至1.0米,充分利用单体液压支撑住(11)的伸缩性进行移架。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,步骤S3中进行扒煤作业时,向顶板(9)方向移动柔性掩护支架(1)时用单体液压支撑柱(11)支撑支架的上支(2),扒下支煤;向底板(10)方向移动柔性掩护架时用单体液压支撑柱(11)支撑支架的下支(4),扒上支煤。
- 根据权利要求1所述的柔性掩护支架采煤法,其特征在于,柔性掩护支架(1)的所述上支(2)与架背(3)内夹角为140°,下支(4)与架背(3)内夹角为135°,上支(2)长度为500mm;所述柔性掩护支架(1)包括薄煤层柔性掩护支架和厚煤层柔性掩护支架,当煤层厚度在2.3m以下时使用薄煤层柔性掩护支架,当煤层厚度在2.3m或2.3m以上时使用厚煤层柔性掩护支架,薄煤层柔性掩护支架单体架背(3)长度为850mm,下支(4)长度为450mm,上支(2)的端部到下支(4)的端部距离为2800mm;厚煤层柔性掩护支架单体上支(2)长度为900mm,架背(3)长度1200mm,下支(4)长度为950mm,上支(2)的端部到下支(4)的端部距离为2800mm。
- 根据权利要求1所述的柔性掩护支架(1)采煤法,其特征在于,步骤S2中所述降尘注水封孔器(12)包括进水接头(16),进水接头(16)与膨胀软管(17)的一端连接,所述膨胀软管(17)的另一端与喷嘴(18)连接,所述喷嘴(18)内安装单向球阀(19)和压力调整弹簧(23)。
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