WO2020037817A1 - 一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法 - Google Patents

一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法 Download PDF

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WO2020037817A1
WO2020037817A1 PCT/CN2018/112377 CN2018112377W WO2020037817A1 WO 2020037817 A1 WO2020037817 A1 WO 2020037817A1 CN 2018112377 W CN2018112377 W CN 2018112377W WO 2020037817 A1 WO2020037817 A1 WO 2020037817A1
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roof
steel wire
rock
pipe
roadway
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PCT/CN2018/112377
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English (en)
French (fr)
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张农
谢正正
魏群
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中国矿业大学
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Publication of WO2020037817A1 publication Critical patent/WO2020037817A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14—Lining predominantly with metal

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  • the invention relates to a flexible steel wire bundle and a supporting method for constructing a thick layer rock beam of a roadway roof, and is particularly suitable for a roof supporting project of a coal mine.
  • the anchor rod is too short and the anchoring range is limited, which can no longer meet the requirements of deep roadway support.
  • the length of the anchor cable is too long and the prestress cannot be effectively diffused. The curse effect is limited.
  • Effective reinforcement within the scope of no anchor cable the anchor cable essentially plays the role of passive suspension of the anchoring area of the anchor rod. In actual engineering, the role of the anchor rod and the anchor cable to strengthen is even smaller. At the same time, the anchor cable is made of multiple strands of steel wire.
  • the purpose of the present invention is to overcome the shortcomings of the prior art, to provide a simple structure and strong reliability, which can determine the material specifications according to the range of the loose ring of the roof of the roadway, and can form a flexible steel wire bundle of the thick rock beam of the roof and Support methods.
  • the flexible steel wire bundle for constructing a thick rock beam on the roof of a roadway of the present invention includes a central pipe, and a plurality of parallel steel wires are arranged around the central pipe, and a gap between the parallel steel wires and the central pipe is provided.
  • An epoxy structural adhesive is provided, and a plurality of clamps are provided on the outside of a plurality of parallel steel wires;
  • the central pipe is composed of a steel pipe and a plastic pipe, wherein the tail end of the plastic pipe is sleeved on the front end of the steel pipe, and the front end of the steel pipe is provided with a plurality of uniformly distributed Multiple barbs are used to connect and fix the steel pipe to the plastic pipe.
  • the barbs are evenly distributed on the side of the steel pipe in 6 to 8 rows, each row being provided with 8 to 10 rows.
  • the front ends of the parallel steel wires are wedge-shaped surfaces. The plastic bag of the anchoring agent is broken, so that the anchoring agent is fully stirred.
  • the parallel steel wire is a cold-drawn low-carbon steel wire, the diameter of the steel wire is 5 mm to 8 mm, and the length of the parallel steel wire is 3500 mm to 4000 mm.
  • the length of the central tube is the same as the length of the parallel steel wires.
  • the thickness of the central tube wall is 1.5 mm to 2.5 mm and the length is 3000 mm to 4000 mm.
  • the length of the steel pipe is 400 mm to 600 mm, and the length of the plastic pipe is 3100 mm to 3600 mm.
  • the plastic pipe effectively maintains the flexibility of the entire steel wire bundle, the steel wire bundle can be bent, and the integrity of the steel wire bundle is maintained.
  • the barb inclination angle is 55 ° to 75 °, and the barb height is 0.2mm to 0.5mm.
  • the front end and the tail end of the multi-stranded parallel steel wire are welded and fixed, the welding length at the front end is 100 mm to 150 mm, the welding distance at the tail end is 50 mm to 80 mm, and the top end of the multi-stranded parallel steel wire is a wedge-shaped structure.
  • the multi-stranded parallel steel wires are provided with multiple clamps for fastening, and the number of clamps is 3 to 5.
  • a method for supporting a flexible steel wire bundle for constructing a thick rock beam on the roof of a roadway the steps are as follows:
  • Step a Use the single-hole ultrasonic detection method to test the size of the loosening ring of the roof of the roadway, and determine the integrity of the surrounding rock of the roof by detecting the acoustic wave velocity, including whether there are cracks and damage in the surrounding rock of the roof;
  • Step b When the range of the roof loosening ring is measured from 0 to 400mm, the rock surrounding the roof of the roadway is determined to be a stable rock layer; when the range of the roof loosening ring is measured from 400mm to 1500mm, the roof rock of the roadway is determined to be the normal rock layer; The range of roof loosening circle is 1500 ⁇ 3000mm, then the roof rock of the roadway is judged as unstable rock layer, so the stability evaluation of the roadway at the current test point is completed;
  • Step c When judging the current roof rock layer is a stable rock layer, select 5 parallel steel wires with a length of 3000mm and equal length central tube to form a flexible steel wire bundle for backup; when judging the current roof stone layer is a general rock layer, select 6 lengths as 3000 ⁇ 3500mm parallel steel wires and equal-length central tubes constitute a flexible steel wire bundle for backup; when judging the current rocky roof rock layer is an unstable rock layer, select 7 parallel wires with a length of 3500 ⁇ 4000mm and equal-length central pipes to form a flexible steel wire bundle for backup. .
  • Step d Support the roadway after the current stability assessment.
  • the appropriate flexible steel wire bundle will be selected according to the current situation of the roadway.
  • the front end will be placed in the borehole to support the roof rock layer. Tensioning and pre-tensioning are performed to control the roadways of different roof types.
  • the present invention has the following advantages compared with the prior art:
  • Each parallel steel wire is arranged in parallel, and each parallel steel wire is uniformly stressed when used under load, which will not cause local stress concentration, and avoids safety accidents caused by parallel wire fracture.
  • the specifications of flexible steel wire bundles can be selected according to the geological conditions and mining environments of different coal mines.
  • the specifications of flexible steel wire bundles are the selection of central tubes of different diameters and different numbers of parallel steel wires, which greatly increases the scientificity of flexible steel wire bundle selection. , Flexibility and convenience.
  • the flexible steel wire bundle is a flexible material, and the length can exceed the height of the roadway.
  • the flexible steel wire bundle can form a thick rock beam on the roof of the roadway to ensure the safety and stability of the roadway.
  • the front ends of the multiple parallel steel wires of the flexible steel wire bundle are wedge-shaped surfaces, which can quickly and uniformly stir the resin medicine roll, and avoid the hidden danger of debonding of the steel wire bundle caused by uneven stirring of the resin medicine roll.
  • FIG. 1 is a schematic diagram of a flexible steel wire bundle according to the present invention.
  • Fig. 2 is a sectional view of the tail end of a flexible steel wire bundle according to the present invention.
  • Fig. 3 is a structural view of a flexible steel wire bundle central tube according to the present invention.
  • Fig. 4 is a cross-sectional view of a 5-strand steel wire of a flexible steel wire bundle according to the present invention.
  • Fig. 5 is a cross-sectional view of a seven-wire steel wire of a flexible steel wire bundle according to the present invention.
  • FIG. 6 is a front view of a wedge surface of a plurality of parallel steel wires of a flexible steel wire bundle according to the present invention.
  • FIG. 7 is a plan view of a wedge-shaped surface of a plurality of parallel steel wires of a flexible steel wire bundle according to the present invention.
  • the flexible steel wire bundle for constructing a thick rock beam on the roof of a roadway includes a central pipe 2, and the length of the central pipe 2 is the same as that of the parallel steel wire 1, and the thickness of the wall of the central pipe 2 is 1.5.
  • mm ⁇ 2.5mm, length is 3000mm ⁇ 4000mm, a plurality of parallel steel wires 1 are arranged around the central tube 2
  • the parallel steel wire 1 is a cold-drawn low-carbon steel wire, the diameter of the steel wire is 5mm-8mm, and the length of the parallel steel wire 1 is 3500mm-4000mm As shown in FIG.
  • the gap between the parallel steel wire 1 and the central pipe 2 is provided with an epoxy structural adhesive 6, and multiple parallel steel wires 1 are provided with a plurality of clamps 3 on the outside;
  • the central pipe 2 consists of a steel pipe 2- 1 and plastic pipe 2-2, the length of the steel pipe 2-1 is 400mm ⁇ 600mm, the length of the plastic pipe 2-2 is 3100mm ⁇ 3600mm, the plastic pipe 2-2 effectively maintains the overall flexibility of the steel wire bundle, the steel wire The bundle can bend and maintain the integrity of the steel wire bundle.
  • the tail end of the plastic pipe 2-2 is sleeved on the front end of the steel pipe 2-1. As shown in FIG.
  • Barb 2-3 barb 2-3 has an inclination angle of 55 ° to 75 °, barb 2-3 has a height of 0.2mm to 0.5mm, barb 2-3 is used to connect steel pipe 2-1 to plastic pipe 2-2 fixed
  • the barbs 2-3 are evenly distributed in 6 to 8 rows on the side of the steel pipe 2-1, each row being provided with 8 to 10 rows; the front ends of the parallel steel wires 1 are wedge-shaped surfaces 8 for breaking the plastic bag of the anchoring agent, Allow the anchoring agent to stir thoroughly.
  • the front end and the tail end of the multi-stranded parallel steel wire 1 are welded and fixed.
  • the welding length of the front end is 100 mm to 150 mm and the welding distance at the end is 50 mm to 80 mm.
  • the multi-stranded parallel steel wire 1 is provided with a plurality of clamps for fastening, and the number of clamps is 3 to 5.
  • a method for supporting a flexible steel wire bundle for constructing a thick rock beam on the roof of a roadway the steps are as follows:
  • Step a Use the single-hole ultrasonic detection method to test the size of the loosening ring of the roof of the roadway, and determine the integrity of the surrounding rock of the roof by detecting the acoustic wave velocity, including whether there are cracks and damage in the surrounding rock of the roof;
  • Step b When the range of the roof loosening ring is measured from 0 to 400mm, the rock surrounding the roof of the roadway is determined to be a stable rock layer; when the range of the roof loosening ring is measured from 400mm to 1500mm, the roof rock of the roadway is determined to be the normal rock layer; The range of roof loosening circle is 1500 ⁇ 3000mm, then the roof rock of the roadway is judged as unstable rock layer, so the stability evaluation of the roadway at the current test point is completed;
  • Step c As shown in FIG. 4, when judging the current roadway roof rock layer as a stable rock layer, select five parallel steel wires 1 with a length of 3000mm and an equal-length central pipe 2 to form a flexible steel wire bundle for backup; when judging that the current roadway roof rock layer is normal For rock formations, six parallel steel wires 1 with a length of 3000 to 3500 mm and equal-length central pipes 2 are selected to form a flexible steel wire bundle for backup. As shown in Figure 5, when the current roof rock layer is judged as an unstable rock layer, seven lengths are selected as 3500 ⁇ 4000mm parallel steel wire 1 and equal-length central pipe 2 constitute a flexible steel wire bundle for backup.
  • Step d Support the roadway after the current stability assessment.
  • the appropriate flexible steel wire bundle will be selected according to the current situation of the roadway.
  • the front end will be placed in the borehole to support the roof rock layer. Tensioning and pre-tensioning are performed to control the roadways of different roof types.

Abstract

一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法，适用于煤矿顶板支护工程。钢丝束包括中心管（2），围绕中心管（2）设置有多根平行钢丝（1），钢丝（1）与中心管（2）之间的缝隙处设有环氧结构胶（6），多根平行钢丝（1）外侧设有多个卡箍（3）；中心管（2）由钢管（2-1）与塑管（2-2）构成，钢管（2-1）前端利用倒刺（2-3）将钢管（2-1）与塑管（2-2）连接固定；平行钢丝（1）前端均为楔形面（8），用于搅破锚固剂塑料袋，使锚固剂得到充分搅拌。柔性钢丝束规格可根据不同煤矿顶板松动圈范围进行选择，增加了柔性钢丝束选择的灵活性和科学性；柔性钢丝束工作受载时，每根钢丝受力均匀，不会产生局部应力集中，避免了钢丝断裂造成的安全事故。

Description

一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法 技术领域
本发明涉及一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法，尤其适用于煤矿顶板支护工程。
背景技术
我国浅部煤炭资源逐渐枯竭，煤炭资源开发由浅部向深部发展是客观的必然规律，我国煤矿开采深度以每年8～12m的速度增加，国有大中型煤矿平均开采深度已达到400m以上，并且有几十个煤矿开采深度超过1000m，最深达到1300m；同时，为了满足大型矿井采煤及掘进设备的运输要求，需要的巷道断面尺寸也非常大，造成巷道的维护与管理非常困难，巷道复修率居高不下，严重制约了矿井的高效安全生产。
深部巷道开挖后，岩体应力将会进行大幅度的调整，围岩会发生变形破坏，岩体塑性区范围也会延伸到深处。现有的锚杆支护系统中，锚杆太短，锚固范围也是有限，已经不能满足深部巷道支护的要求；并且，锚索长度过长，预应力不能有效的扩散，加持作用有限，形不成锚索范围内的有效加固，锚索实质上起到被动悬吊锚杆锚固区的作用，在实际工程中，锚杆锚索协同强化的作用更小，同时，锚索是由多股钢丝缠绕而成，在高地应力环境下极有可能有应力集中，具有抽丝断裂的安全隐患。因此，目前急需一种适合深部煤炭开采的可形成巷道顶板厚层岩梁的支护材料。
发明内容
技术问题：本发明的目的是克服已有技术中的不足，提供一种结构简单，可靠性强，可根据巷道顶板松动圈范围确定材料规格，并能形成顶板厚层岩梁的柔性钢丝束及支护方法。
技术方案：为实现上述技术目的，本发明的用于构建巷道顶板厚层岩梁的柔性钢丝束，包括中心管，围绕中心管设置有多根平行钢丝，平行钢丝与中心管之间的缝隙处设有环氧结构胶，多根平行钢丝外侧设有多个卡箍；所述中心管由钢管与塑管构成，其中塑管尾端套在钢管的前端，钢管前端设有多个均匀分布的多个倒刺，倒刺用于将钢管与塑管连接固定，所述的倒刺在钢管侧面上均匀分布6～8排，每排设置8～10个；平行钢丝前端均为楔形面，用于搅破锚固剂塑料袋，使锚固剂得到充分搅拌。
所述的平行钢丝为冷拔低碳钢丝，钢丝直径为5mm～8mm，平行钢丝长度为3500mm～4000mm。
所述的中心管长度与平行钢丝长度相同，中心管管壁厚度为1.5mm～2.5mm，长度为 3000mm～4000mm。
所述的钢管长度为400mm～600mm，所述的塑管长度为3100mm～3600mm，塑管有效保持钢丝束整体的柔性，钢丝束能够弯曲，并保持钢丝束的整体性。
倒刺倾角为55°～75°，倒刺高度为0.2mm～0.5mm。
所述的多股平行钢丝前端和尾端焊接固定，前端焊接长度为100mm～150mm，尾端焊接距离为50mm～80mm，多股平行钢丝顶端为楔形面结构。
所述的多股平行钢丝上设有多个卡箍紧固，卡箍数量为3～5个。
一种用于构建巷道顶板厚层岩梁的柔性钢丝束的支护方法，其步骤如下：
步骤a：利用单孔超声波检测法测试巷道顶板松动圈的大小，通过检测得到的声波波速判断顶板围岩完整性，包括顶板围岩是否存在裂隙和破坏；
步骤b：当测得顶板松动圈范围为0～400mm，则判断巷道顶板围岩为稳定岩层；当测得顶板松动圈范围为400mm～1500mm，则判断巷道顶板围岩为一般岩层；当测得顶板松动圈范围为1500～3000mm，则判断巷道顶板围岩为不稳定岩层，从而完成当前试验点巷道的稳定性评估；
步骤c：当判断当前巷道顶板岩层为稳定岩层时，选取5根长度为3000mm的平行钢丝和等长中心管构成柔性钢丝束备用；当判断当前巷道顶板岩层为一般岩层时，选取6根长度为3000～3500mm的平行钢丝和等长中心管构成柔性钢丝束备用；当判断当前巷道顶板岩层为不稳定岩层时，选取7根长度为3500～4000mm的平行钢丝和等长中心管构成柔性钢丝束备用。
步骤d：在当前稳定性评估后的巷道进行支护，将根据当前巷道情况选择合适的柔性钢丝束将其前端放入到钻孔中支护到顶板岩层当中，用张拉泵对柔性钢丝束进行张拉预紧，从而达到控制不同顶板类型的巷道。
有益效果：由于采用了上述技术方案，本发明与现有技术相比具有如下优点：
(1)每根平行钢丝平行设置，使用受载时每根平行钢丝受力均匀，不会产生局部应力集中，避免了平行钢丝断裂造成的安全事故。
(2)柔性钢丝束规格可根据不同煤矿的地质条件、开采环境进行选择，并且柔性钢丝束规格的是选择不同直径的中心管及不同数量的平行钢丝，大大增加了柔性钢丝束选择的科学性、灵活性和方便性。
(3)柔性钢丝束是柔性材料，长度可以超出巷道的高度，利用柔性钢丝束可形成巷道顶板厚层岩梁，保证巷道的安全稳定。
(4)柔性钢丝束多根平行钢丝前端均为楔形面，可以快速均匀的搅拌树脂药卷，避免了因树脂药卷搅拌不均而引起的钢丝束脱粘隐患。
附图说明
图1是本发明的柔性钢丝束示意图。
图2是本发明的柔性钢丝束尾端剖面图。
图3是本发明的柔性钢丝束中心管结构图。
图4是本发明的柔性钢丝束5股钢丝截面图。
图5是本发明的柔性钢丝束7股钢丝截面图。
图6是本发明的柔性钢丝束多根平行钢丝前端楔形面主视图。
图7是本发明的柔性钢丝束多根平行钢丝前端楔形面俯视图。
图中：1、多根平行钢丝；2、中心管；2-1、钢管；2-2、塑管；2-3、倒刺；3、卡箍；4、前端；5、尾端；6、环氧结构胶；7、焊接处；8、楔形面。
具体实施方式
下面结合附图对本发明的一个实施例作进一步的描述：
如图1所示，本发明的用于构建巷道顶板厚层岩梁的柔性钢丝束，包括中心管2，所述的中心管2长度与平行钢丝1长度相同，中心管2管壁厚度为1.5mm～2.5mm，长度为3000mm～4000mm，围绕中心管2设置有多根平行钢丝1所述的平行钢丝1为冷拔低碳钢丝，钢丝直径为5mm～8mm，平行钢丝1长度为3500mm～4000mm，如图2所示，平行钢丝1与中心管2之间的缝隙处设有环氧结构胶6，多根平行钢丝1外侧设有多个卡箍3；所述中心管2由钢管2-1与塑管2-2构成，所述的钢管2-1长度为400mm～600mm，所述的塑管2-2长度为3100mm～3600mm，塑管2-2有效保持钢丝束整体的柔性，钢丝束能够弯曲，并保持钢丝束的整体性，其中塑管2-2尾端套在钢管2-1的前端，如图3所示，钢管2-1前端设有多个均匀分布的多个倒刺2-3，倒刺2-3倾角为55°～75°，倒刺2-3高度为0.2mm～0.5mm，倒刺2-3用于将钢管2-1与塑管2-2连接固定，所述的倒刺2-3在钢管2-1侧面上均匀分布6～8排，每排设置8～10个；平行钢丝1前端均为楔形面8，用于搅破锚固剂塑料袋，使锚固剂得到充分搅拌。述的多股平行钢丝1前端和尾端焊接固定，前端焊接长度为100mm～150mm，尾端焊接距离为50mm～80mm，如图6和图7所示，多股平行钢丝1顶端为楔形面结构，所述的多股平行钢丝1上设有多个卡箍紧固，卡箍数量为3～5个。
一种用于构建巷道顶板厚层岩梁的柔性钢丝束的支护方法，其步骤如下：
步骤a：利用单孔超声波检测法测试巷道顶板松动圈的大小，通过检测得到的声波波速判断顶板围岩完整性，包括顶板围岩是否存在裂隙和破坏；
步骤b：当测得顶板松动圈范围为0～400mm，则判断巷道顶板围岩为稳定岩层；当测得顶板松动圈范围为400mm～1500mm，则判断巷道顶板围岩为一般岩层；当测得顶板松动圈范围为1500～3000mm，则判断巷道顶板围岩为不稳定岩层，从而完成当前试验点巷道的稳定性评估；
步骤c：如图4所示，当判断当前巷道顶板岩层为稳定岩层时，选取5根长度为3000mm的平行钢丝1和等长中心管2构成柔性钢丝束备用；当判断当前巷道顶板岩层为一般岩层时，选取6根长度为3000～3500mm的平行钢丝1和等长中心管2构成柔性钢丝束备用；如图5所示，当判断当前巷道顶板岩层为不稳定岩层时，选取7根长度为3500～4000mm的平行钢丝1和等长中心管2构成柔性钢丝束备用。
步骤d：在当前稳定性评估后的巷道进行支护，将根据当前巷道情况选择合适的柔性钢丝束将其前端放入到钻孔中支护到顶板岩层当中，用张拉泵对柔性钢丝束进行张拉预紧，从而达到控制不同顶板类型的巷道。

Claims (8)

  1. 一种用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：它包括中心管(2)，围绕中心管(2)设置有多根平行钢丝(1)，多根平行钢丝(1)与中心管(2)之间的缝隙处设有环氧结构胶(6)，多根平行钢丝(1)外侧设有多个卡箍(3)；所述中心管(2)由钢管(2-1)与塑管(2-2)构成，其中塑管(2-2)尾端套在钢管(2-1)的前端，钢管(2-1)前端设有多个均匀分布的多个倒刺(2-3)，倒刺(2-3)用于将钢管(2-1)与塑管(2-2)连接固定，多根平行钢丝(1)前端均为楔形面(8)，用于搅破锚固剂塑料袋，使锚固剂得到充分搅拌。
  2. 根据权利要求1所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的多根平行钢丝(1)为冷拔低碳钢丝，钢丝直径为5mm～8mm，多根平行钢丝(1)长度为3500mm～4000mm。
  3. 根据权利要求1所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的中心管(2)长度与多根平行钢丝(1)长度相同，中心管(2)管壁厚度为1.5mm～2.5mm，长度为3000mm～4000mm。
  4. 根据权利要求3所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的钢管(2-1)长度为400mm～600mm，所述的塑管(2-2)长度为3100mm～3600mm，塑管(2-2)有效保持钢丝束整体的柔性，钢丝束能够弯曲，并保持钢丝束的整体性。
  5. 根据权利要求1所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的倒刺(2-3)在钢管(2-1)侧面上均匀分布6～8排，每排设置8～10个，倒刺(2-3)倾角为55°～75°，倒刺(2-3)高度为0.2mm～0.5mm。
  6. 根据权利要求1所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的多根平行钢丝(1)前端和尾端焊接固定，前端焊接长度为100mm～150mm，尾端焊接距离为50mm～80mm，多根平行钢丝(1)前端为楔形面结构。
  7. 根据权利要求1所述的用于构建巷道顶板厚层岩梁的柔性钢丝束，其特征在于：所述的多根平行钢丝(1)上设有多个卡箍紧固，卡箍数量为3～5个。
  8. 一种使用权利要求1所述用于构建巷道顶板厚层岩梁的柔性钢丝束的支护方法，其特征在于步骤如下：
    步骤a：利用单孔超声波检测法测试巷道顶板松动圈的大小，通过检测得到的声波波速判断顶板围岩完整性，包括顶板围岩是否存在裂隙和破坏；
    步骤b：当测得顶板松动圈范围为0～400mm，则判断巷道顶板围岩为稳定岩层；当测得顶板松动圈范围为400mm～1500mm，则判断巷道顶板围岩为一般岩层；当测得顶板松动圈范围为1500～3000mm，则判断巷道顶板围岩为不稳定岩层，从而完成当前试验点巷道的稳定性评估；
    步骤c：当判断当前巷道顶板岩层为稳定岩层时，选取5根长度为3000mm的平行钢丝(1)和等长中心管(2)构成柔性钢丝束备用；当判断当前巷道顶板岩层为一般岩层时，选取6根长度为3000～3500mm的平行钢丝(1)和等长中心管(2)构成柔性钢丝束备用；当判断当前巷道顶板岩层为不稳定岩层时，选取7根长度为3500～4000mm的平行钢丝(1)和等长中心管(2)构成柔性钢丝束备用。
    步骤d：在当前稳定性评估后的巷道进行支护，将根据当前巷道情况选择合适的柔性钢丝束将其前端放入到钻孔中支护到顶板岩层当中，用张拉泵对柔性钢丝束进行张拉预紧，从而达到控制不同顶板类型的巷道。
PCT/CN2018/112377 2018-08-20 2018-10-29 一种用于构建巷道顶板厚层岩梁的柔性钢丝束及支护方法 WO2020037817A1 (zh)

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