The invention relates to an advanced support method for gob-side retaining roadway working face. The steps are as follows: a row of anchor rope trusses are constructed along the roadway direction within the end bolts of the original supporting steel strip at the upper and lower shoulders of gob-side retaining roadway; W steel strips are connected with anchor rope trusses by W steel strips; W steel strips have two end holes under the anchor rope truss and overlap with anchor rope truss holes; W steel strips have an equal strong thread in the middle hole. Steel resin bolt, resin bolt with W guard plate, high-strength anchor plate pressure on W steel belt to support; along goaf retaining roadway upper shoulder original support steel belt end bolt, along the roadway direction construction of a row of single anchor cable; at the top of the middle of the lower part of the roadway, along the roadway direction construction of a row of single anchor cable, single anchor cable in the front and back of two rows of steel belt. The invention reduces the input of supporting materials, reduces the deformation of roadways and increases the support strength.
【技术实现步骤摘要】
一种沿空留巷工作面的超前支护方法
本专利技术涉及一种沿空留巷工作面的超前支护方法,适用于沿空留巷的采煤工作面两巷超前加固,属于煤矿安全生产领域。
技术介绍
沿空留巷的采煤工作面两巷采用锚网带支护,工作面开采时,上巷上、下帮各采用一排单体液压支柱配金属铰接顶梁进行超前支护,超前支护长度不低于50m,单体液压支柱初撑力不低于90KN,支柱穿铁鞋。经过对对各阶段巷道变形量观测数据对比发现,采用单体支柱配铰接顶梁加强支护时,巷道变形量较大,水平移近量达到342mm,顶板下沉量达到103mm,底板底鼓量达到263mm;原支护方法支护强度不高,支护材料占用量较大,职工劳动强度大,生产效率较低、材料费用投入较大。
技术实现思路
本专利技术的目的在于提供一种沿空留巷工作面的超前支护方法,本专利技术巷道的变形量明显减少,支护强度增加。本专利技术的技术方案如下:一种沿空留巷工作面的超前支护方法,步骤如下:沿空留巷上巷下肩原支护钢带端头锚杆以里,沿巷道走向施工一排锚索桁架,锚索桁架长度2.2m,锚索间距1.8m;锚索桁架与锚索桁架之间,采用长×宽×厚=2200×280×2.75mm的W钢带连接,W钢带两端头孔眼压在锚索桁架下与锚索桁架孔眼重叠,W钢带中间眼孔打一条MSGLD-400/20×2400mm(X)等强螺纹钢式树脂锚杆,树脂锚杆配合W护板、高强锚盘压在W钢带上进行支护;沿空留巷上巷上肩原支护钢带端头锚杆以里,沿巷道走向施工一排单根锚索,锚索间距2.7m;巷道顶部中间偏下部位置,沿巷道走向施工一排单根锚索,单根锚索打设在前后两排钢带中间,梁长1.2m,锚索间距2.7m。进一步 ...
【技术保护点】
1.一种沿空留巷工作面的超前支护方法,其特征在于,超前支护方法如下:沿空留巷上巷下肩原支护钢带端头锚杆以里,沿巷道走向施工一排锚索桁架,锚索桁架长度2.2m,锚索间距1.8m;锚索桁架与锚索桁架之间,采用长×宽×厚=2200×280×2.75mm的W钢带连接,W钢带两端头孔眼压在锚索桁架下与锚索桁架孔眼重叠,W钢带中间眼孔打一条MSGLD‑400/20×2400mm(X)等强螺纹钢式树脂锚杆,树脂锚杆配合W护板、高强锚盘压在W钢带上进行支护;沿空留巷上巷上肩原支护钢带端头锚杆以里,沿巷道走向施工一排单根锚索,锚索间距2.7m;巷道顶部中间偏下部位置,沿巷道走向施工一排单根锚索,单根锚索打设在前后两排钢带中间,梁长1.2m,锚索间距2.7m。
【技术特征摘要】
1.一种沿空留巷工作面的超前支护方法,其特征在于,超前支护方法如下:沿空留巷上巷下肩原支护钢带端头锚杆以里,沿巷道走向施工一排锚索桁架,锚索桁架长度2.2m,锚索间距1.8m;锚索桁架与锚索桁架之间,采用长×宽×厚=2200×280×2.75mm的W钢带连接,W钢带两端头孔眼压在锚索桁架下与锚索桁架孔眼重叠,W钢带中间眼孔打一条MSGLD-400/20×2400mm(X)等强螺纹钢式树脂锚杆,树脂锚杆配合W护板、高强锚盘压在W钢带上进行支护;沿空留巷上巷上肩原支护钢带端头锚杆以里,沿巷道走向施工一排单根锚索,锚索间距2.7m;巷道顶部中间偏下部位置,沿巷道走向施工...
【专利技术属性】
技术研发人员:刘纯文,聂凤祥,周吉利,任勇杰,李仁永,刘峰,倪萌,刘祖太,
申请(专利权)人:莱芜市万祥矿业有限公司,
类型:发明
国别省市:山东,37
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