WO2020151162A1 - Procédé de construction pour tige d'ancrage souple - Google Patents

Procédé de construction pour tige d'ancrage souple Download PDF

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Publication number
WO2020151162A1
WO2020151162A1 PCT/CN2019/090616 CN2019090616W WO2020151162A1 WO 2020151162 A1 WO2020151162 A1 WO 2020151162A1 CN 2019090616 W CN2019090616 W CN 2019090616W WO 2020151162 A1 WO2020151162 A1 WO 2020151162A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
tray
anchor rod
ball head
flexible anchor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/090616
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English (en)
Chinese (zh)
Inventor
张农
谢正正
魏群
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
Original Assignee
China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT, China University of Mining and Technology Beijing CUMTB filed Critical China University of Mining and Technology CUMT
Priority to CA3156371A priority Critical patent/CA3156371C/fr
Publication of WO2020151162A1 publication Critical patent/WO2020151162A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006—Anchoring-bolts made of cables or wires
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/003—Machines for drilling anchor holes and setting anchor bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • 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
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the 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
    • E21D21/0086—Bearing plates

Definitions

  • the invention relates to a construction method of a flexible anchor rod, and is especially suitable for a construction method of a flexible anchor rod used in the field of coal mine tunnel support engineering.
  • Bolt support technology has been widely used in coal mine roadways in our country. At first, it was first used in rock tunnels with relatively stable surrounding rocks. Later, by improving the stiffness and strength of bolt materials, the bolt support technology can adapt to soft and broken surrounding rocks. Roadways and mines affect roadways with various bad conditions.
  • Bolt support mainly uses bolts to drive into the preset boreholes of the surrounding rock of the roadway, and combine the shallow broken surrounding rock mass with the deep stable rock mass to achieve the purpose of controlling roadway deformation and achieving roadway safety and stability.
  • the longer the anchor cable length the greater the pre-tightening force required. Therefore, sufficient pre-tightening force cannot be applied on site, and limited pre-tightening force cannot effectively reinforce the anchoring area of the anchor cable, and roadway deformation cannot be better controlled.
  • the flexible anchor rod used includes a flexible anchor rod body, a tray, a fixed torque nut, an anti-friction washer and an anti-twist self-aligning ball head.
  • the tray is set at the tail of the flexible anchor body, and the fixed torque nut fixes the tray.
  • the flexible anchor rod body includes a steel strand, the tail end of the steel strand is arranged in a connecting sleeve, the connecting sleeve includes a tail end and a head end, and the transition section between the tail end and the head end is provided with a ring-shaped boss ,
  • the boss is provided with a limit cylinder, the surface of the boss facing the head end is a vertical end surface, the surface of the boss facing the tail end is a tapered surface, the outer cylindrical surface of the tail end has threads, and the end is provided with a symmetrical arrangement along the connecting sleeve shaft
  • the head end of the rectangular groove is provided with an inner cylindrical hole connected with the steel strand.
  • the steel strand is inserted into the cylindrical hole of the connecting sleeve.
  • the bottom of the inner cylindrical hole is provided with an annular groove.
  • a friction-increasing wire spring is arranged in the middle, and the fastening between the steel strand and the connecting sleeve is realized by squeezing the outer cylindrical surface of the connecting sleeve;
  • the limit cylinder includes a conical cylinder body of the limit cylinder.
  • the conical cylinder body of the limit cylinder includes two openings, one large and one small.
  • the large opening on the conical cylinder of the limit cylinder is provided with a flange and a small opening. Equipped with a ring bayonet, the inner diameter of the ring bayonet is less than the outer diameter of the boss 0.5 ⁇ 2mm, the limit cylinder is sleeved by the end of the connecting sleeve, the ring bayonet deforms and crosses the tapered end face of the boss and is clamped in the vertical of the boss On the end face, the limit cylinder is made of hard plastic material;
  • the tray includes a tray body and a stop column.
  • the tray body is composed of a round flange and an arch.
  • the center of the arch is provided with a tapered hole, and the large end of the tapered hole faces the top of the arch, and
  • the tapered surface of the tapered hole is provided with multiple grooves evenly distributed along the circumference, the number of grooves is 4 to 8, and the stop column is fixed to the flanging part by welding or interference connection;
  • the anti-twist self-aligning ball head includes a curved surface and a flat surface, wherein the curved surface includes a plurality of tapered surfaces, and a protrusion I is arranged between every two tapered surfaces.
  • the radius of the tapered surface is the same as that of the tapered hole.
  • the radius and the height of the protrusion I are the same as that of the groove.
  • the number of protrusions I is the same as the number of grooves.
  • the circular hole is provided with a convex II distributed on the opposite side.
  • the cross-section of the convex II is a rectangular structure, and the width of the convex II is 0.5-1mm smaller than the width of the rectangular groove.
  • the height of the protrusion II is 0.5-1mm smaller than the width of the rectangular groove, and the protrusion II is embedded in the rectangular groove to limit the torsion of the flexible anchor body;
  • Step a Construct stepped bolt holes in the rock mass, where the stepped bolt holes close to the excavation surface are large sections, and the rest of the stepped bolt holes are small sections, and the diameter of the large section is larger than that after the head end extrusion
  • the diameter of the large hole section is 4-10mm, and the depth of the large hole section meets the requirements of the flanging of the limit cylinder after the flexible anchor body is inserted into the anchor hole to closely fit the excavation surface;
  • Step b Put the anchoring agent into the stepped hole of the anchor rod, press the flexible anchor body against the anchoring agent, use the front part of the flexible anchor body to push the anchoring agent into the bottom of the stepped hole of the anchor rod, and use the anchor drill to rotate and set the torque
  • the nut then drives the flexible anchor body and the anti-twist aligning ball head to rotate together, and while rotating, the flexible anchor is pushed by the bolt drill to stir the anchoring agent evenly, rotate and advance until the flanging of the limit cylinder fits tightly before opening
  • the bolter rig stops rotating and stays for 30 seconds to wait for the anchoring agent to solidify;
  • Step c Start the bolting machine to drive the fixed torque nut to rotate and destroy the fixed torque structure of the fixed torque nut, so that the fixed torque nut continues to be screwed in along the connecting sleeve and tighten the anti-friction washer, anti-twist self-aligning ball head, and the tray to make the tray
  • the upper stop post is stuck to the excavation surface to prevent the tray from rotating.
  • the protrusion I on the self-aligning ball head is stuck with the groove on the tray, thereby preventing the anti-twist self-aligning ball head from rotating and the anti-twist self-aligning ball
  • the head restricts the rotation of the connecting sleeve and thus the rotation of the flexible anchor rod body through the protrusion II, so that the flexible anchor rod body does not rotate when the anchor rod drill applies a pre-tightening force, and the pre-tightening force is 60-100 kN.
  • Step d Withdraw the bolt drill and repeat steps a to c to construct the next flexible bolt.
  • the present invention Due to the adoption of the above technical solution, the present invention has the following advantages compared with the prior art:
  • the bolt body used can be bent, which solves the problem that the length of the bolt is restricted by the height of the roadway. With the continuous increase of the depth of the coal, it is necessary to build thick anchored rock beams, and high-strength long bolts are needed to control the roadway. Deformation, the breaking load and length of flexible bolts are 2 times higher than ordinary bolts, which can adapt to the complex mine environment;
  • the limit tube in the flexible anchor rod can accurately locate the installation position of the anchor rod. Even if the bolt hole is too deep, the limit tube can be used to constrain the outside of the rock mass to ensure the installation length of the flexible anchor rod connecting sleeve. It will not cause the flexible bolt to fail, and at the same time help to ensure a uniform exposed length of the bolt, and realize the quality standardization of coal mine bolt support;
  • the tray the self-aligning ball head and the connecting sleeve, the groove and the boss are used to fasten each other to solve the thorny problem of the flexible bolt following the nut rotation when the bolter is pre-tightened, and the anti-friction washer makes the flexible
  • the anchor rod can exert a larger pre-tightening force to achieve a greater anchor pre-tightening force and better restrain the deformation of the roadway.
  • Figure 1 is a cross-sectional view of the flexible anchor body of the present invention.
  • Figure 2 is a partial enlarged cross-sectional view of the flexible anchor body of the present invention.
  • Figure 3 is a cross-sectional view of the connecting sleeve of the flexible anchor body of the present invention.
  • Figure 4 is a schematic diagram of the appearance of the connecting sleeve of the flexible anchor body of the present invention.
  • Figure 5 is a cross-sectional view of the limiting cylinder of the present invention.
  • Fig. 6 is a schematic diagram of the unpretensioned state of the flexible anchor rod of the present invention.
  • Figure 7 is a cross-sectional view of the flexible anchor rod of the present invention after pretensioning.
  • Fig. 8 is a schematic diagram of an anchor hole for rock mass construction according to the present invention.
  • Figure 9 is a schematic view of the tray of the present invention.
  • Figure 10 is a schematic diagram of the anti-twist self-aligning ball head of the present invention.
  • Figure 11 is a schematic diagram of the fixed torque nut of the present invention.
  • a flexible anchor rod of the present invention includes a flexible anchor rod body B, a tray C, a constant torque nut D, an anti-friction washer E and an anti-twist self-aligning ball Head F, where the tray C is set at the tail of the flexible anchor body B, the fixed torque nut D fixes the tray C, and the anti-friction washer E and the anti-twist self-aligning ball head F are arranged between the tray C and the fixed torque nut D;
  • the flexible anchor rod body B includes a steel strand B1, the tail end of the steel strand B1 is arranged in a connecting sleeve B4, the connecting sleeve B4 includes a tail end B4a and a head end B4b, and the end between the tail end B4a and the head end B4b
  • the transition section is provided with a ring-shaped boss B4e, the boss B4e is equipped with a limiting cylinder B3, the surface of the boss B4e facing the head end B4b is a vertical end surface, and the surface of the boss B4e facing the tail end B4a is a tapered surface.
  • the tail end B4a is provided with a symmetrically arranged rectangular groove B4f along the axial direction of the connecting sleeve B4, and the head end B4b is provided with an inner cylindrical hole B4c and an inner cylindrical hole B4c connected with the steel strand B1
  • the inner wall is provided with threads and the bottom of the hole is provided with an annular groove B4d.
  • the steel strand B1 is inserted into the cylindrical hole B4c of the connecting sleeve B4, and a friction increasing wire spring B2 is arranged between the steel strand B1 and the cylindrical hole B4c, which is connected by extrusion
  • the outer cylindrical surface of the head end B4b of the sleeve B4 realizes the fastening between the steel strand B1 and the connecting sleeve B4.
  • the limit cylinder B3 includes a conical conical cylinder body B3c of the confinement cylinder.
  • the conical cylinder body B3c of the confinement cylinder includes two openings, one large and one small.
  • the opening is provided with a flange B3a, and the small opening is provided with an annular bayonet B3b.
  • the inner diameter of the annular bayonet B3b is smaller than the outer diameter of the boss B4e by 0.5-2mm.
  • the limit cylinder B3 is sleeved by the end B4a of the connecting sleeve B4, and has a ring shape.
  • the bayonet B3b deforms and passes over the tapered end surface of the boss B4e to be clamped on the vertical end surface of the boss B4e, and the limiting cylinder B3 is made of hard plastic material.
  • the tray C includes a tray body C1 and a stop column C2.
  • the tray body C1 is composed of a circular flanged portion C1b and an arch C1c.
  • the center of the arch C1c is provided with a tapered hole C1a ,
  • the large end of the tapered hole C1a faces the top end of the arch C1c, and the tapered surface of the tapered hole C1c is provided with multiple grooves C1d evenly distributed along the circumference.
  • the number of grooves C1d is 4-8.
  • the movable column C2 is fixed to the flange part C1b by welding or interference connection.
  • the anti-twist self-aligning ball head F includes a curved surface and a flat surface.
  • the curved surface includes a plurality of tapered surfaces F1.
  • a protrusion IF2 is provided between each two tapered surfaces F1.
  • the radius of the surface F1 is the same as the radius of the tapered hole C1a, the width and height of the protrusion IF2 are smaller than that of the groove C1d, and the number of the protrusion IF2 is the same as the number of the groove C1d.
  • the protrusion IF2 The embedded groove C1d ensures that the anti-twist ball head F and the tray C are fixed in the circumferential direction.
  • the center of the anti-twist self-aligning ball head F is provided with a circular hole F4.
  • the circular hole is provided with a cross-section of the convex II F3 and the convex II F3 distributed on the opposite side. It is a rectangular structure, the width of the protrusion IIF3 is 0.5-1mm smaller than the width of the rectangular groove B4f, and the height of the protrusion IIF3 is 0.5-1mm smaller than the width of the rectangular groove B4f.
  • the protrusion IIF3 is embedded in the rectangular groove B4f to limit the twisting of the flexible anchor body B .
  • the constant torque nut D includes a nut body D1 and a constant torque baffle D2
  • Step a Construct stepped bolt holes in rock mass A.
  • the stepped bolt hole near the excavation surface A1 is the large hole section A2, the remaining stepped bolt holes are the small hole section A3, and the diameter of the large hole section A2 is larger than
  • the extruded diameter of the head B4b is 4-10mm, and the depth of the large hole section A2 meets the requirements of the flexible bolt body B being inserted into the bolt hole.
  • the flanging of the limit cylinder B3 closely fits the excavation surface A1;
  • Step b Put the anchoring agent into the stepped hole of the anchor rod, press the flexible anchor body B against the anchoring agent, use the front part of the flexible anchor body B to push the anchoring agent into the bottom of the stepped hole of the anchor rod, and use the bolt drill to rotate
  • the fixed torque nut D then drives the flexible bolt body B and the anti-twist aligning ball head F to rotate together, and while rotating, the flexible bolt is pushed by the bolt drill to stir the anchoring agent evenly, rotate and advance until the limit cylinder B3 turns over After the edge is closely attached to the face A1 near the excavation, the bolter will stop rotating and stay for 30 seconds to wait for the anchoring agent to solidify;
  • Step c Start the bolting machine to drive the fixed torque nut D to rotate and destroy the fixed torque structure of the fixed torque nut D, so that the fixed torque nut D continues to be screwed in along the connecting sleeve B4 and tighten the anti-friction washer E and anti-twist self-aligning ball head F.
  • Pallet C so that the stop post C2 on the pallet C is stuck to the excavation surface A1 to prevent the pallet C from rotating.
  • the protrusion IF2 on the self-aligning ball head F is stuck with the groove C1d on the pallet C, thereby preventing The anti-twist self-aligning ball head F rotates, and the anti-twist self-aligning ball head F restricts the rotation of the connecting sleeve B4 through the protrusion IIF3, thereby restricting the rotation of the flexible anchor body B, so that the flexible anchor body is exerted by the anchor drill. B does not rotate, and the pre-tightening force is 60-100kN.
  • Step d Withdraw the bolt drill and repeat steps a to c to construct the next flexible bolt.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Piles And Underground Anchors (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

La présente invention concerne un procédé de construction pour une tige d'ancrage souple, approprié pour une utilisation dans le domaine de l'ingénierie de support de tunnel de mine de charbon. Le procédé comprend les étapes consistant à : construire un trou de tige d'ancrage étagé dans une masse rocheuse (A) ; presser un corps de tige d'ancrage souple (B) contre un agent d'ancrage solide et le pousser dans le fond du trou de tige d'ancrage étagé, faire tourner un écrou de couple fixe (D) pour entraîner le corps de tige d'ancrage souple (B) et une tête de bille de centrage anti-torsion (F) à tourner et à avancer ensemble jusqu'à ce qu'une machine de forage de tige d'ancrage s'arrête de tourner après qu'une bride d'un cylindre de limitation (B3) est étroitement fixée à une face d'excavation (A1), puis attendre que l'agent d'ancrage solide se solidifie ; entraîner l'écrou de couple fixe (D) pour tourner et rompre la structure de couple fixe de l'écrou de couple fixe (D), de telle sorte que l'écrou de couple fixe (D) continue à se visser vers l'intérieur le long d'un manchon de liaison (B4) et comprimer une rondelle anti-frottement (E), la tête de bille de centrage anti-torsion (F), et un plateau (C), de telle sorte qu'un montant d'arrêt (C2) sur le plateau (C) se fixe à la face d'excavation (A1) et empêche la rotation du plateau (C), empêchant efficacement la rotation de la tête de bille de centrage anti-torsion (F), la tête de bille de centrage anti-torsion (F) limitant la rotation du manchon de liaison (B4) au moyen d'une saillie II (F3) pour ainsi limiter la rotation du corps de tige d'ancrage souple (B), de telle sorte que le corps de tige d'ancrage souple (B) ne tourne pas lorsque la machine de forage de tige d'ancrage applique une force de pré-tension. Le présent procédé de construction a une vitesse de construction rapide et une efficacité de support élevée.
PCT/CN2019/090616 2019-01-25 2019-06-11 Procédé de construction pour tige d'ancrage souple Ceased WO2020151162A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA3156371A CA3156371C (fr) 2019-01-25 2019-06-11 Procede de construction pour tige d'ancrage souple

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910073740.0 2019-01-25
CN201910073740.0A CN109488355B (zh) 2019-01-25 2019-01-25 一种柔性锚杆的施工方法

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WO2020151162A1 true WO2020151162A1 (fr) 2020-07-30

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CN (1) CN109488355B (fr)
CA (1) CA3156371C (fr)
WO (1) WO2020151162A1 (fr)

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CN112377231A (zh) * 2020-11-18 2021-02-19 贵州工程应用技术学院 一种煤矿支护用的让压闭锁环
CN113090312A (zh) * 2021-04-29 2021-07-09 湖南科技大学 一种可施加预紧力的让压锚杆及其使用方法
CN115110978A (zh) * 2022-06-17 2022-09-27 成都现代万通锚固技术有限公司 一步式锚杆机机装接头、包含该接头的锚杆及其安装方法
CN115492620A (zh) * 2022-09-22 2022-12-20 陕西欣阳美航实业有限公司 一种可以检测不同地质的矿用锚杆装置及其生产方法
CN116398204A (zh) * 2023-03-23 2023-07-07 成都现代万通锚固技术有限公司 一步式锚杆机机装接头、包含该接头的锚杆及其安装方法
CN117585951A (zh) * 2023-10-09 2024-02-23 汪峻峰 用于锚喷支护的薄喷封闭组合物、锚喷支护装置和施工方法
CN118959059A (zh) * 2024-09-29 2024-11-15 中国矿业大学 一种自进式分级让压锚杆装置及其使用方法
CN119145893A (zh) * 2024-11-19 2024-12-17 石家庄铁道大学 互嵌式隧道让压支护结构及施工方法

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CN109488355B (zh) * 2019-01-25 2019-09-03 中国矿业大学 一种柔性锚杆的施工方法
CN110130962B (zh) * 2019-07-01 2020-06-16 尤洛卡（山东）矿业科技有限公司 一种可回收大托盘
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CN113957996B (zh) * 2021-11-17 2023-05-23 甘肃天水绿色装配式建筑产业发展有限公司 一种高韧性预应力装配式混凝土建筑结构
CN114136255B (zh) * 2021-11-30 2024-02-02 重庆大学 一种测点自锁结构及带有该测点自锁结构的多点位移计
CN114718622B (zh) * 2022-04-19 2025-10-17 攀枝花学院 高预紧力锚索
CN115680733B (zh) * 2022-11-09 2025-05-27 贵州盘江煤电集团技术研究院有限公司 一种巷道掘进单一化自动支护方法
CN115539101A (zh) * 2022-11-10 2022-12-30 中铁隆昌铁路器材有限公司 一种定预应力锚杆安装装置及其安装工艺
WO2024173981A1 (fr) * 2023-02-21 2024-08-29 Hardrock Mining Solutions Pty Ltd Outil d'installation pour l'insertion d'un boulon d'ancrage
CN116771503A (zh) * 2023-06-19 2023-09-19 中国航发湖南动力机械研究所 进气锥安装结构、航空发动机转子系统和航空发动机
CN117266904B (zh) * 2023-10-17 2025-08-29 中国矿业大学 一种集数字化监测的柔性中空锚杆及施工工法
CN119754825B (zh) * 2024-12-20 2025-11-28 中煤科工(天津)岩层智控科技有限公司 钻锚一体化锚杆钻车

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