WO2020143154A1 - 一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法 - Google Patents

一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法 Download PDF

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WO2020143154A1
WO2020143154A1 PCT/CN2019/088695 CN2019088695W WO2020143154A1 WO 2020143154 A1 WO2020143154 A1 WO 2020143154A1 CN 2019088695 W CN2019088695 W CN 2019088695W WO 2020143154 A1 WO2020143154 A1 WO 2020143154A1
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Prior art keywords
anchor
anchor ring
anchor rod
ring
tray
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PCT/CN2019/088695
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English (en)
French (fr)
Inventor
冯晓巍
汪明坤
张农
何青源
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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Publication of WO2020143154A1 publication Critical patent/WO2020143154A1/zh
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet

Definitions

  • the invention relates to a bolt supporting method, in particular to a section suitable for soft rock large-deformation roadway or a section that needs to be supported by pressure-absorbing support, a deformation-energy-absorbing anchor ring for protecting the safety of miners, and prevention of bolt ejection from breaking Anchor support method.
  • Bolt support technology plays an extremely important role in the field of coal mine support in my country, with obvious economic and technical benefits, so it is widely promoted and applied.
  • many mines can encounter soft rock large deformation tunnels or tunnels with impact tendency such as rock bursts.
  • Such tunnels have high original rock stress and complicated stress disturbance, and most tunnels have to bear once Or multiple excavation disturbances.
  • most projects tend to adopt dense support, lengthened support, super support and other solutions to deal with this problem, but it has brought a series of problems such as increased cost, complicated operation, and slow construction period.
  • the purpose of the present invention is to overcome the shortcomings in the prior art, to provide a method of simple and easy to operate, low cost, strong adaptability, deformation prevention energy absorption anchor ring that can prevent accidents and prevention of anchor rod breakage
  • the ejection bolt support method is especially suitable for soft rock high-stress roadways or roadways with impact tendency.
  • the deformable energy-absorbing anchor ring and the anchor rod supporting method for preventing the ejection of the anchor rod from breakage include anchor rods that extend into the borehole and are fixed by an anchoring agent, and are sequentially arranged on the exposed anchor rods of the hole with wire mesh,
  • the tray and the nut are provided with two holes at the tail end of the anchor rod that are crossed in a cross shape at the tail of the anchor rod, and an anchor ring is provided between the tray and the nut.
  • the opposite holes on the rod, the contact ends of the anchor ring with the tray and the nut are flat, respectively are the fitting surface of the anchor ring nut end and the anchor ring tray end fitting surface, and the outer arc surfaces on both sides of the anchor ring fitting surface Two fluorescent bands are laid respectively on the top.
  • the inner diameter of the anchor ring is 90-110mm, the outer diameter is 120-140mm, the height of the anchor ring in the axial direction is 30-50mm, the diameter of the opposite hole of the anchor rod is 19-23mm, the anchor
  • the opposite holes of the ring are divided into anchor ring nut end openings and anchor ring tray end openings, and rubber washers are set in the opposite hole holes, respectively, anchor ring nut end opening rubber washers and anchor ring tray end opening rubbers washer.
  • the width of the anchor ring opposite hole and the end of the anchor ring is 50-60mm, and the length is equal to the height of the anchor ring in the axial direction; the end of the anchor ring and the end of the anchor ring The width is 30-40mm, and the length is equal to the height of the anchor ring in the axial direction.
  • the two fluorescent bands (3) are arranged symmetrically.
  • the center angle of the anchor ring is 90° along the outer circumference of the anchor ring.
  • the center line is perpendicular to the axis of the opposite hole of the anchor ring.
  • the inside of the plastic fluorescent tape is divided into two rooms: the inner layer is the inner layer of the fluorescent tape encapsulated with ester compounds and fluorescent dyes (3-1), and the outer layer is the outer layer of the fluorescent tape encapsulated with peroxide (3- 2), the inner layer (3-1) of the fluorescent band machine glass is located in the middle.
  • the anchor ring is made of alloy steel with a yield strength of 180-200MPa.
  • the hole at the tail of the anchor is provided with two cross-shaped holes at the tail end of the anchor, the hole diameter is 3-5mm, the distance between the two holes is 20-30mm, and the outer hole is 10-30mm from the end of the anchor .
  • the specific support steps are as follows:
  • the present invention is especially suitable for soft rock high-stress roadways or roadways with impact tendency, has deformation energy absorption characteristics, adapts to rock deformation; can pre-warn broken catapults of key parts of the bolt support system, and adopt measures in time to prevent accidents occur.
  • the fluorescent band also deforms with the deformation of the anchor ring. When the deformation range exceeds the bending limit of the plexiglass, the inner layer liquid and the outer layer liquid mix to produce a fluorescent effect.
  • Figure 1 is a cross-sectional view of the present invention when it is actually applied
  • Figure 2 is a three-dimensional view of the tail end of the present invention when it is actually applied;
  • FIG. 3 is a three-dimensional view of the anchor ring at the fitting end of the nut of the present invention.
  • FIG. 4 is a three-dimensional view of the anchoring ring at the fitting end of the tray in the present invention.
  • FIG. 5 is a cross-sectional view when the anchor ring is deformed in the actual application of the present invention.
  • FIG. 6 is a top view of FIG. 5 in the present invention.
  • the deformable energy-absorbing anchor ring and the anchor supporting device for preventing the ejection of the anchor rod from breaking include the anchor rod 1 that extends into the borehole 8 and is fixed by the anchoring agent 9 and is sequentially arranged at the orifice A barbed wire 7, a tray 6 and a nut 4 are provided on the exposed anchor rod 1.
  • Two tail holes 5 at the rear end of the anchor rod 1 are provided at the tail of the anchor rod 1 and are arranged between the tray 6 and the nut 4
  • Anchor ring 2 which has a facing hole pierced on the anchor rod 1
  • the contact end of the anchor ring 2 with the tray 6 and the nut 4 is a plane, which is the fitting surface of the nut end of the anchor ring and the anchor, respectively
  • Two fluorescent bands 3 are respectively laid on the outer circular arc surfaces of the upper and lower sides of the bonding surface of the ring tray end and the anchor ring 2.
  • the inner diameter of the anchor ring 2 is 90-110mm, the outer diameter is 120-140mm, the height of the anchor ring in the axial direction is 30-50mm, and the diameter of the opposite hole of the anchor rod 1 is 19-23mm
  • the opposite holes of the anchor ring are divided into the anchor hole end opening 2-1 and the anchor ring tray end opening 2-4, and the opposite hole holes are all covered with rubber washers, which are respectively the anchor ring nut end opening rubber washers 2-2 and Anchor ring tray end rubber gasket 2-5.
  • the opposite hole of the anchor ring 2 is attached to the tray 6 and the width of the end fitting surface 2-6 of the end of the anchor ring is 50-60mm, the length is equal to the height of the anchor ring in the axial direction; the end of the anchor ring is attached to the nut 4
  • the width of the fitting surface 2-3 of the nut end is 30-40mm, and the length is equal to the height of the anchor ring in the axial direction.
  • the two fluorescent bands 3 are arranged symmetrically.
  • the center angle of the anchor ring is 90° along the outer circumference of the anchor ring.
  • the center line is perpendicular to the axis of the opposite hole of the anchor ring.
  • Part is the inner and outer houses, the inner layer is the inner layer of the fluorescent bandage encapsulated with ester compounds and fluorescent dyes 3-1, the outer layer is the outer layer of the fluorescent bandage encapsulated with peroxides 3-2, the inner part of the fluorescent bands is the machine glass Layer 3-1 is located in the middle.
  • the ester compound uses bis-oxalate, and the peroxide is hydrogen peroxide. When the two are mixed, energy will be released, which will be transferred to the fluorescent pigment molecules, and the fluorescent dye will then release energy in the form of visible light.
  • the anchor ring 2 is made of alloy steel and has a yield strength of 180-200 MPa.
  • the rear end of the anchor rod 1 is provided with two cross-shaped cross-shaped anchor end openings 5 with a hole diameter of 3-5mm, the distance between the two holes is 20-30mm, and the outer hole is 10 away from the end of the anchor -30mm.
  • the fluorescent band deforms accordingly.
  • the fluorescent band 3 in the middle of the fluorescent band 3 has the organic glass inner layer 3-1 Cracked, the ester compound and fluorescent dye in the inner layer 3-1 of the fluorescent band organic glass reacted with the peroxide in the outer layer 3-2 of the fluorescent band to release fluorescence; the greater the deformation of the anchor ring 2, the fluorescent band The larger the rupture range of the inner glass layer 3-1, the stronger the intensity of fluorescence, which indicates that the anchor ring 2 is subjected to more stress, and the greater the probability of the ejection of the anchor rod breaking;

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

公开了一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，尤其适用于软岩大变形巷道或需采用吸能让压支护的地段。该方法将锚杆(1)穿过开有对向孔的锚环(2)，并通过托盘(6)与螺母(4)对岩体(10)施加压力，阻止变形。当锚杆受力增大时，锚环在对向孔方向产生变形，从而起到吸能作用。利用锚环外侧对向布置的荧光带(3)即可观测出锚环变形幅度，预判锚杆受力大小并对潜在部位的骤然破断起到警示作用。在锚环变形过大或者荧光范围过大时，将防弹射铁丝(11)穿过锚杆尾部两个交叉布置的开孔(5)，并在铁丝网(7)上拧紧固定。若锚杆在任一关键位置破断后，两个交叉布置的防弹射铁丝即可阻拦锚杆往巷道空间内的弹射，避免伤人。还公开了一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，其结构简单，操作方便，经济成本低、安全可靠，效果好。

Description

一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法 技术领域
本发明涉及一种锚杆支护方法，尤其是一种适用于软岩大变形巷道或需采用吸能让压支护的地段、保护矿工安全的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法。
背景技术
锚杆支护技术在我国煤矿支护领域起着极为重要的作用，具有明显的经济技术效益，因此被广泛推广应用。近年来，随着煤矿开采深度的增加，在很多矿井都能够遇到软岩大变形巷道或者具有岩爆等冲击倾向巷道，此类巷道原岩应力高，应力扰动复杂，且多数巷道要承受一次或者多次采掘扰动。当前多数工程倾向于采用密集支护、加长支护、超强支护等方案来应对这一问题，但是随之而来带来了成本升高，操作复杂，工期缓慢等一系列问题。
毋庸置疑的是，在上述工程技术背景下，锚杆支护技术仍旧具有较高的普遍适用性。为了应对并适应上述工程地质条件，近年来诸多国内外学者都提出：软岩高应力条件下或者具有冲击倾向的巷道支护要求支护构件具备一定的让压变形能力，要求支护构件能够适应岩体的变形。例如，我国何满潮院士所提出的恒阻大变形锚杆，还有挪威科技大学Charlie C.Li教授所提出的D型锚杆，这些锚杆在应用于软岩高应力巷道和冲击倾向巷道时都取得了非常理想的经济技术效果，具有非常广泛的影响力。
另外一方面，当锚杆受力超过自身强度时，将会发生锚杆突然断裂现象，从而在瞬间将产生很大的冲击力。这种冲击力源自岩体变形能量，岩体变形将这种能量集聚于锚杆杆体上，迫使后者在杆体上承受非常高的预拉力。在断裂的瞬间，岩体外部构件将会像“离弦的箭”或者“子弹”一样射向巷道开放空间，对开放空间内的作业人员和设备产生巨大伤害。不管是螺母弹射还是破断杆体弹射，都具有巨大安全隐患，我国淮南矿区、山东新汶矿区等每年由于巷道锚杆支护部件骤然弹射造成的设备损伤和人员伤亡事故时有发生。
针对上述问题，目前还没有一套健全的科学预警系统或措施。部分煤矿采用给锚杆尾部“带帽”或者“缠绕铁丝”的方式来阻止潜在断裂弹射，具有一定盲目性和不可预测性。而将所有锚杆支护系统都采用这一方式，则有些锚杆支护系统在巷道正常服役期间最终并未发生实际弹射，这样一来会造成作业时间长，拖慢掘进速度等问题。
发明内容
技术问题：本发明的目的是要克服现有技术中存在的不足之处，提供一种方法简单易操作、成本低、适应性强、能防止事故发生的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，尤其适用于软岩高应力巷道或具有冲击倾向巷道。
技术方案：本发明的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，包括伸入钻孔内并经锚固剂固定的锚杆、依次布置在孔口外露锚杆上铁丝网、托盘和螺母，在所述的锚杆尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔，在托盘和螺母之间设有锚环，所述锚环上开有穿套在锚杆上的对向孔，锚环与托盘和螺母的接触端为平面，分别为锚环螺母端贴合面和锚环托盘端贴合面，锚环贴合面上下两侧的外圆弧面上分别敷设有两条荧光带。
所述的锚环的内径为90-110mm，外径为120-140mm，锚环沿着轴向方向的高度为30-50mm，穿套在锚杆上的对向孔孔径为19-23mm，锚环的对向孔分为锚环螺母端开孔和锚环托盘端开孔，对向孔孔内均套装有橡胶垫圈，分别为锚环螺母端开孔橡胶垫圈和锚环托盘端开孔橡胶垫圈。
所述锚环对向孔与托盘贴合一端锚环托盘端贴合面的宽度为50-60mm，长度等同于锚环轴向方向的高度；与螺母贴合一端锚环螺母端贴合面的宽度为30-40mm，长度等同于锚环轴向方向的高度。
所述的两条荧光带(3)对称设置，荧光带(3)沿着锚环外周敷设范围所对应锚环圆心角为90°，中心连线与锚环对向孔轴线相互垂直，每条塑料荧光带内部分为内外两屋，内层为封装有酯类化合物和荧光染料的荧光带有机玻璃内层(3-1)，外层为封装有过氧化物的荧光带外层(3-2)，荧光带有机玻璃内层(3-1)位于中部。
所述的锚环由合金钢制成，屈服强度为180-200MPa。
所述锚杆尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔的孔径为3-5mm，两个孔的间距为20-30mm，其中外侧孔距离锚杆端头为10-30mm。
一种使用权利要求1所述的装置的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，包括在预定岩体位置按照既定规程钻孔、塞入锚固剂、钻进锚杆；具体支护步骤如下：
(1)将托盘压覆在钻孔孔口处的铁丝网上，检查锚环上对向孔的锚环螺母端开孔和锚环托盘端开孔内锚环螺母端开孔橡胶垫圈和锚环托盘端开孔橡胶垫圈的位置，检查荧光带的贴合固定情况，而后先将锚环的锚环托盘端贴合面一侧的锚环托盘端开孔穿入锚杆，再将与锚环螺母端贴合面一侧的锚环螺母端开孔穿入锚杆，将锚环压紧托盘；
(2)将螺母穿过锚杆尾部，拧紧在锚环上，按已有技术利用机具施加到规定的扭矩；
(3)观察锚环的变形，锚环变形时荧光带随之变形，锚环沿对向孔直径方向变形超过30％时，荧光带内中部的荧光带有机玻璃内层开始破裂，荧光带有机玻璃内层中的酯类化合物和荧光染料渗出与有机玻璃内层外的荧光带外层中的过氧化物发生反应，释放荧光；锚环变形越大，荧光带有机玻璃内层破裂范围越大，荧光显现强度越强，预示锚环承受应力越大，潜在发生锚杆断裂弹射概率就越大；
(4)当锚环在对向孔方向的变形超过三分之二时，或荧光带内荧光扩散范围超过荧光带长度三分之二时，分别用两根防弹射铁丝穿过锚杆尾部的穿孔，防弹射铁丝两端分别拧紧固定在托盘附近的铁丝网上，两根防弹射铁丝呈现十字形交叉分布状；
(5)当锚杆杆体应力达到承载极限而引发锚杆断裂时，无论是托盘、螺母的骤然弹射，还是锚环的骤然弹射，都将被十字形交叉分布的防弹射铁丝所阻拦。
有益效果：本发明尤其适用于软岩高应力巷道或具有冲击倾向巷道，具有变形吸能特性，适应岩体变形；能够预警锚杆支护系统关键部位的破断弹射，并及时采用措施，防止事故发生。与现有技术相比的优点：
1)具有变形吸能优势。通过采用在托盘与螺母之间增设锚环，锚环的屈服强度低于锚杆屈服强度，优先于锚杆产生变形。锚环在对向孔轴向方向上产生变形，能够变“不可缩支护”为“可缩支护”或“柔性支护”，增强了锚杆支护系统对岩体变形的适应性，协调了岩体变形与锚杆变形的不一致性，延缓了锚杆支护系统在过大岩体变形下的提前失效。此外，锚环的对向孔内均套有橡胶垫圈，避免了锚杆杆体与对向孔孔壁之间的硬接触，也避免了锚环在变形过程中对锚杆杆体产生应力集中。
2)具有破断弹射预警功能。锚环外壁对向固定的荧光带内部有过氧化物、酯类化合物和荧光染料，其中过氧化物为外层，酯类化合物和荧光染料通过有机玻璃包装为内层。荧光带随着锚环变形也变形，变形幅度超过有机玻璃弯曲极限时，内层液体与外层液体混合，产生荧光效应。锚环变形越大，有机玻璃破裂范围越大，荧光显现强度越强，预示锚环承受应力越大，潜在发生锚杆断裂弹射概率就越大。
(3)具有破断防弹射功能。当锚环在对向孔方向的变形超过三分之二时，或荧光带内荧光扩散范围超过荧光带长度三分之二时，分别用两根防弹射铁丝穿过锚杆尾部穿孔，并拧紧固定在托盘附近的铁丝网上。当锚杆杆体应力达到承载极限而引发锚杆断裂时，无论是托盘、螺母的骤然弹射，还是锚环、锚杆的骤然弹射，都能够被十字形交叉分布的防弹射铁丝所阻拦。能够提高井下人员和设备的安全性。依托于该锚环，无需在安设每根锚杆时都加装防弹射铁丝，只需要后期对具有弹射可能性的锚杆加装防弹射铁丝，从而提高施工工效。
(4)成本低，方法简单易操作，适应性强。
附图说明
图1是本发明实际应用时的剖面图；
图2是本发明实际应用时尾端的三维图；
图3是本发明中锚环在螺母贴合端的三维图；
图4是本发明中锚环在托盘贴合端的三维图；
图5是本发明实际应用中当锚环发生变形时的剖面图；
图6是本发明中图5的俯视图。
1-锚杆，2-锚环，3-荧光带，4-螺母，5-锚杆尾端开孔，6-托盘，7-铁丝网，8-钻孔，9-锚固剂，10-岩体，11-防弹射铁丝。
2-1-锚环螺母端开孔，2-2-锚环螺母端开孔橡胶垫圈，2-3-锚环螺母端贴合面，2-4-锚环托盘端开孔，2-5-锚环托盘端开孔橡胶垫圈，2-6-锚环托盘端贴合面，3-1-荧光带有机玻璃内层，3-2-荧光带外层。
具体实施方式
下面结合附图中的实施例对本发明作进一步描述：
如图1所示，本发明的变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，包括伸入钻孔8内并经锚固剂9固定的锚杆1、依次布置在孔口外露锚杆1上铁丝网7、托盘6和螺母4，在所述的锚杆1尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔5，在托盘6和螺母4之间设有锚环2，所述锚环2上开有穿套在锚杆1上的对向孔，锚环2与托盘6和螺母4的接触端为平面，分别为锚环螺母端贴合面和锚环托盘端贴合面，锚环2贴合面上下两侧的外圆弧面上分别敷设有两条荧光带3。
所述的锚环2的内径为90-110mm，外径为120-140mm，锚环沿着轴向方向的高度为30-50mm，穿套在锚杆1上的对向孔孔径为19-23mm，锚环的对向孔分为锚环螺母端开孔2-1和锚环托盘端开孔2-4，对向孔孔内均套装有橡胶垫圈，分别为锚环螺母端开孔橡胶垫圈2-2和锚环托盘端开孔橡胶垫圈2-5。
所述锚环2对向孔与托盘6贴合一端锚环托盘端贴合面2-6的宽度为50-60mm，长度等同于锚环轴向方向的高度；与螺母4贴合一端锚环螺母端贴合面2-3的宽度为30-40mm，长度等同于锚环轴向方向的高度。
所述的两条荧光带3对称设置，荧光带3沿着锚环外周敷设范围所对应锚环圆心角为90°，中心连线与锚环对向孔轴线相互垂直，每条塑料荧光带内部分为内外两屋，内层为封装有酯类化合物和荧光染料的荧光带有机玻璃内层3-1，外层为封装有过氧化物的荧光带外层3-2，荧光带有机玻璃内层3-1位于中部。所述的酯类化合物采用双草酸酯，过氧化物为过氧化氢，两者混合后将释放能量，从而传递给荧光颜料分子，荧光染料而后以可见光的形式释放能量。
所述的锚环2由合金钢制成，屈服强度为180-200MPa。
所述锚杆1尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔5的孔径为3-5mm，两个孔的间距为20-30mm，其中外侧孔距离锚杆端头为10-30mm。
本发明的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，具体步骤如下：
1.预定岩体10的位置按照既定规程钻孔8，吹孔排除岩屑，塞入锚固剂9，钻进锚杆1；
2.将托盘6压覆在钻孔孔口处的铁丝网7上，检查锚环2上对向孔的锚环螺母端开孔2-1和锚环托盘端开孔2-4内锚环螺母端开孔橡胶垫圈2-2和锚环托盘端开孔橡胶垫圈2-5的位置，检查荧光带3的贴合固定情况，而后先将锚环2的锚环托盘端贴合面2-6一侧的锚环托盘端开孔2-4穿入锚杆1，再将锚环螺母端贴合面2-3一侧的锚环螺母端开孔2-1穿入锚杆，将锚环2压紧托盘；
3.将螺母4穿过锚杆尾部，拧紧在锚环上，并通过锚杆1尾部螺纹拧紧在锚环2上，利用施工机具施加到规定扭矩，锁紧螺母；
4.观察锚环2的变形，锚环变形时荧光带随之变形，锚环2沿对向孔直径方向的变形超过30％时，荧光带3内中部的荧光带有机玻璃内层3-1破裂，荧光带有机玻璃内层3-1中的酯类化合物和荧光染料渗出与荧光带外层3-2中的过氧化物发生反应，释放荧光；锚环2变形越大，荧光带有机玻璃内层3-1破裂范围越大，荧光显现强度越强，预示锚环2承受应力越大，潜在发生锚杆断裂弹射概率就越大；
5.当锚环2在对向孔方向的变形超过三分之二时，或荧光带3内荧光扩散范围超过荧光带长度三分之二时，分别用两根防弹射铁丝11穿过锚杆尾部的穿孔5，防弹射铁丝7两端分别拧紧固定在托盘附近的铁丝网7上，两根防弹射铁丝11呈现十字形交叉分布状；
6.当锚杆1杆体应力达到承载极限而引发锚杆断裂时，无论是托盘6、螺母4的骤然弹射，还是锚环1的骤然弹射，都将被十字形交叉分布的防弹射铁丝所阻拦，能够有效的保护井下设备与人员的安全。

Claims (7)

  1. 一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，包括伸入钻孔(8)内并经锚固剂(9)固定的锚杆(1)、依次布置在孔口外露锚杆(1)上铁丝网(7)、托盘(6)和螺母(4)，其特征在于：在所述的锚杆(1)尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔(5)，在托盘(6)和螺母(4)之间设有锚环(2)，所述锚环(2)上开有穿套在锚杆(1)上的对向孔，锚环(2)与托盘(6)和螺母(4)的接触端为平面，分别为锚环螺母端贴合面(2-3)和锚环托盘端贴合面(2-6)，锚环(2)贴合面上下两侧的外圆弧面上分别敷设有两条荧光带(3)。
  2. 根据权利要求1所述的一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，其特征在于：所述的锚环(2)的内径为90-110mm，外径为120-140mm，锚环沿着轴向方向的高度为30-50mm，穿套在锚杆(1)上的对向孔孔径为19-23mm，锚环的对向孔分为锚环螺母端开孔(2-1)和锚环托盘端开孔(2-4)，对向孔孔内均套装有橡胶垫圈，分别为锚环螺母端开孔橡胶垫圈(2-2)和锚环托盘端开孔橡胶垫圈(2-5)。
  3. 根据权利要求1或2所述的一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，其特征在于：所述锚环(2)对向孔与托盘(6)贴合一端锚环托盘端贴合面(2-6)的宽度为50-60mm，长度等同于锚环轴向方向的高度；与螺母(4)贴合一端锚环螺母端贴合面(2-3)的宽度为30-40mm，长度等同于锚环轴向方向的高度。
  4. 根据权利要求1所述的一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护装置，其特征在于：所述的两条荧光带(3)对称设置，荧光带(3)沿着锚环外周敷设范围所对应锚环圆心角为90°，中心连线与锚环对向孔轴线相互垂直，每条塑料荧光带内部分为内外两层，内层为封装有酯类化合物和荧光染料的荧光带有机玻璃内层(3-1)，外层为封装有过氧化物的荧光带外层(3-2)，荧光带有机玻璃内层(3-1)位于中部。
  5. 根据权利要求1所述的一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，其特征在于：所述的锚环(2)由合金钢制成，屈服强度为180-200MPa。
  6. 根据权利要求1所述的一种变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，其特征在于：所述锚杆(1)尾部开设有两个间隔呈十字形交叉的锚杆尾端开孔(5)的孔径为3-5mm，两个孔的间距为20-30mm，其中外侧孔距离锚杆端头为10-30mm。
  7. 一种使用权利要求1所述的装置的变形吸能锚环和防止锚杆断裂弹射的锚杆支护方法，包括在预定岩体位置按照既定规程钻孔、塞入锚固剂、钻进锚杆；其特征在于，具体支护步骤如下：
    (1)将托盘(6)压覆在钻孔孔口处的铁丝网(7)上，检查锚环(2)上对向孔的锚环螺母端开孔(2-1)和锚环托盘端开孔(2-4)内锚环螺母端开孔橡胶垫圈(2-2)和锚环托盘 端开孔橡胶垫圈(2-5)的位置，检查荧光带(3)的贴合固定情况，而后先将锚环(2)的锚环托盘端贴合面(2-6)一侧的锚环托盘端开孔(2-4)穿入锚杆(1)，再将与锚环螺母端贴合面(2-3)一侧的锚环螺母端开孔(2-1)穿入锚杆(1)，将锚环(2)压紧托盘(6)；
    (2)将螺母(4)穿过锚杆尾部，拧紧在锚环(2)上，按已有技术利用机具施加到规定的扭矩；
    (3)观察锚环(2)的变形，锚环(2)变形时荧光带(3)随之变形，锚环(2)沿对向孔直径方向变形超过30％时，荧光带(3)内的荧光带有机玻璃内层(3-1)开始破裂，荧光带有机玻璃内层(3-1)中的酯类化合物和荧光染料渗出与有机玻璃外的荧光带外层(3-2)中的过氧化物发生反应，释放荧光；锚环(2)变形越大，荧光带有机玻璃内层(3-1)破裂范围越大，荧光显现强度越强，预示锚环(2)承受应力越大，潜在发生锚杆断裂弹射概率就越大；
    (4)当锚环(2)在对向孔方向的变形超过三分之二时，或荧光带(3)内荧光扩散范围超过荧光带长度三分之二时，分别用两根防弹射铁丝穿过锚杆尾部的穿孔，防弹射铁丝两端分别拧紧固定在托盘附近的铁丝网上，两根防弹射铁丝呈现十字形交叉分布状；
    (5)当锚杆杆体应力达到承载极限而引发锚杆断裂时，无论是托盘(6)、螺母(4)的骤然弹射，还是锚环(1)的骤然弹射，都将被十字形交叉分布的防弹射铁丝所阻拦。
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