【導(dǎo)讀】采提供了借鑒經(jīng)驗。進率和維修費用,降低成本,而且簡化了生產(chǎn)系統(tǒng),實現(xiàn)了集中生產(chǎn)。冒落狀態(tài),造成煤矸混合,使采出率降低。②頂煤厚度較小,易產(chǎn)生離層、斷裂,造成。直接頂冒頂,控制端面頂煤是中厚煤層放頂煤開采取得成功的關(guān)鍵技術(shù)之一。斷層,落差152ｍ;下部境界Ｆ8斷層,落差21ｍ。所采煤層為7#煤,賦存穩(wěn)定,煤層。中硬,煤厚4～,平均,煤層傾角平均24°。接底為泥巖,厚。工作面內(nèi)受Ｆ6-6和Ｆ8斷層的影響,伴生的小斷層比較發(fā)。礦井瓦斯等級為低瓦斯礦井,煤層自然發(fā)火期為6～12個月。阻力為1800ｋＮ,最大控頂距為,最小控頂距為。頂鋪金屬菱形網(wǎng),網(wǎng)寬,長,材料為10#鍍鋅鐵絲,架,移架速度慢時應(yīng)降低割煤速度。經(jīng)試驗確定工作面放煤工藝為兩采一放,放煤步距為,采用。立即封網(wǎng),網(wǎng)口采用“#”型封口。循環(huán)作業(yè)方式采用三八制,兩班生產(chǎn)一班檢修?，F(xiàn)象,支架部件損壞嚴重。區(qū)漏風(fēng)等措施,回采期間未出現(xiàn)煤層自然發(fā)火現(xiàn)象。

　　

【正文】 ng suitably moves the support for suitably, also must further enhance the ZWM grid support stability, prevented the support loses face, pushes the accident occurrence. (3) Working surface picks high must control strictly, after the superelevation the rack is not steady, simultaneously can create goes against the coal excessively to be thin, causes puts when the coal the percentage of refuse content rise, picks Gao Guodi to be able to create the stabilizing bar and the Liang build bees saddleshaped, moves a difficulty, affects the security and the production. (4) Aims at 7177 working surface management the characteristic, should use “in the supports and protections, protect, controls, the proper attention to both steadily”, by “protects, controls” the primarily principle. 7177 working surface support load is not big, the support has the enough at the beginning of design to support the strength and the working resistance, in order to control goes against the coal the stability, maintains certain initially supports the strength and the reasonable working resistance is necessary, also namely “”.“Protects” the main purpose is the maximum limit control goes against the coal to brave to leak, accidents and so on coal wall cavein of sides of a mine tunnel occurs, simultaneously is “” the creation good condition, therefore “protects” is “” the premise, protects goes against not well on a not zeal, on the one 15 hand should reduce the end surface to control the zenith distance as far as possible, strengthens the working surface support end surface supports and protections ability, controls above working surface machine to go against the coal not to brave to fall。 On the other hand needs the prompt supports and protections, the implementation scratches goes against moves the frame, the enhancement protects goes against.“Controls” namely controls the prop to drill the bottom, enhances the supports and protections system rigidity, adopts the plan should be floats the ledger wall the coal cleaning up to be clean, or defers to the ledger wall resistant to pression to enter the intensity, puts on shoes to the prop, when necessity may use measures and so on bottom millstone.“Steady” namely guaranteed the support the stability, prevented the crooked frame, loses face, ceases the accident the ZWM grid support own on heavy under light, is the unstable structure, the support beam column position and the entire frame condition, puts the support the synthesis to be more nimble than, once therefore operates carelessly, the beam column position is unreasonable, supports and protects the resistance to be insufficient lightly, the heavy piece of damage support even appears loses face the accident, therefore the worker technology and the management level play the very major role in the support use, should strengthen the working surface production management, must control the good prop topbeam position, the relative relations and the phase, prevented the prop weles the mountain insufficiently, the support crooked, the topbeam flees the position and so on. (5) This grid support both may with machine pick the coordination and to be 16 possible to pick the coordination with the artillery, its initial investment only quite Yu Zong puts the support total investment 1/5 to 1/8 about, it has the volume small, the weight light, the structure simple, the installment and the transportation convenient, the operation easy and so on the merits, to returns to picks the geological condition plex and side the horn block section coal bed has the good nimble patibility, therefore in the present coal mine economy universal difficult situation, it suits in the small coal the ZWM support to put correctly goes against the coal and takes the efficient measure, may display its nimble, the patibility fully strong, the cost low, the semiautomation, the security and the high production highly effective merit.