CA3156369C - Flexible anchor rod - Google Patents
Flexible anchor rod Download PDFInfo
- Publication number
- CA3156369C CA3156369C CA3156369A CA3156369A CA3156369C CA 3156369 C CA3156369 C CA 3156369C CA 3156369 A CA3156369 A CA 3156369A CA 3156369 A CA3156369 A CA 3156369A CA 3156369 C CA3156369 C CA 3156369C
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- Canada
- Prior art keywords
- anchor rod
- flexible anchor
- conical
- connecting sleeve
- tray
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D21/008—Anchoring or tensioning means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0093—Accessories
Abstract
A flexible anchor rod, which is suitable for the field of coal mine tunnel support engineering. The flexible anchor rod comprises a flexible anchor rod body (B), a tray (C), a fixed torque nut (D), an anti-friction washer (E) and an anti-twist self-aligning ball head (F). The flexible anchor rod body (B) comprises a connecting sleeve (B4), a steel strand (B1), a limit cylinder (B3) and a friction-increasing wire spring (B2); the connecting sleeve (B4) is reliably fixed to the steel strand (B1) and the wire spring (B2) by means of an extrusion manner, and the limit cylinder (B3) is sleeved on the connecting sleeve (B4). The described flexible anchor rod is not limited by the height of the tunnel, and effectively enhances the support effect. The unique anti-twist structure solves the problem of the torsion of the rod body when the flexible anchor rod is preloaded, and improves the preloading force. The anchor rod improves construction speed by means of spiral preloading, and the support efficiency is high.
Description
Description Flexible Anchor Rod Technical Field The present invention relates to a flexible anchor rod, in particular to a flexible anchor rod used in the field of coal mine roadway support engineering.
Background Art At present, anchor rod supporting technology has been widely applied to coal mine roadways in China, the anchor rod supporting technology was initially used in rock roadways with relatively stable surrounding rocks; later, through improving the rigidity and strength of anchor rod materials, the anchor rod supporting technology could adapt to roadways with various harsh conditions, such as roadways with soft and fractured surrounding rocks and roadways disturbed by mining, etc. The anchor rod supporting mainly utilizes anchor rods driven into preformed boreholes in the surrounding rock of a roadway to integrate the shallow fractured surrounding rock mass with the deep stable rock mass, so as to attain a purpose of controlling the deformation of the roadway and realizing the safety and stability of the roadway.
The anchor rods are very important in the anchor rod supporting system, and there are a variety of anchor rods. With the complexity of roadway conditions, resin anchored pre-stressed anchor cables with small borehole diameter have also been developed and applied to coal mine sites. In summary, thanks to the diversity of anchor rods and anchor cables, the anchor rods and anchor cables can adapt to the complex site conditions of coal mines in China. However, owing to the limitation of roadway height, the length of anchor rods is limited to about 2 m, and the thickness of the anchoring areas with anchor rods is also limited to 2 m, which can't adapt to the complex geological conditions of the current roadways anymore. Although anchor cables can be long enough, the installation process of anchor cables is more complicated when compared with the installation process of anchor rods, and anchor cables have to be tensioned by means of a pump at later period, which restricts the advancing speed of coal roadway. Besides, the longer an anchor cable is, the greater the pre-tightening force is required; however, it is unable to apply sufficient pre-tightening force on site, and the anchoring areas anchored by means of anchor cables can't be reinforced effectively with the limited pre-tightening force, and the roadway deformation can't be controlled well. Therefore, it is urgent to develop an anchor rod that is flexible and installed quickly.
Contents of the Invention Technical Problem: in view of the drawbacks in the prior art, the present invention provides a flexible anchor rod, which is flexible so as to adapt to complex geological conditions, doesn't have to be tensioned by means of a pump, can be installed quickly, and attains a good supporting effect.
Technical Solution: in order to attain the above technical object, the flexible anchor rod provided by the present invention comprises a flexible anchor rod body, a tray, a fixed torque nut, an anti-friction washer and an anti-twist self-aligning ball head, wherein the tray is arranged at a tail section of the flexible anchor rod body, the tray is fixed by the fixed torque nut, and the anti-friction washer and the anti-twist self-aligning ball head are arranged between the tray and the fixed torque nut;
Date Recue/Date Received 2022-03-24 The flexible anchor rod body comprises a steel strand, a tail end of the steel strand is arranged in a connecting sleeve, the connecting sleeve comprises a tail end and a head end, a transition section between the tail end and the head end is provided with a lug boss having an annular structure, a limit cylinder is arranged on the lug boss, a face of the lug boss towards the head end is a vertical end face, a face of the lug boss towards the tail end is a conical face, an outer cylindrical surface of the tail end is provided with threads, the tail end is provided with rectangular grooves arranged in symmetry in an axial direction of the connecting sleeve, the head end is provided with an inner cylindrical hole connected with the steel strand, the steel strand is inserted into the inner 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 between the steel strand and the inner cylindrical hole, and the steel strand and the connecting sleeve are fastened together by squeezing an outer cylindrical surface of the head end of the connecting sleeve.
The limit cylinder comprises a conical cylinder body of the limit cylinder, which comprises a large opening and a small opening, wherein the large opening of the conical cylinder body of the limit cylinder is provided with a flanged edge, and the small opening is provided with an annular bayonet having an inner diameter smaller than the outer diameter of the lug boss by 0.5 to 2 mm;
the limit cylinder is sleeved from the tail end of the connecting sleeve, and the annular bayonet is deformed, beyond the conical end face of the lug boss, and is stuck on the vertical end face of the lug boss; and the limit cylinder is made of a hard plastic material.
The tray comprises a tray body and a stop post, the tray body consists of a circular flanged part and an arch part, a conical hole is provided at the center of the arch part, a larger end of the conical hole faces a top end of the arch part, and a conical surface of the conical hole is provided with a plurality of grooves evenly distributed along the circumference, the number of the grooves is 4 to 8; the stop post is fixed with the flanged part by welding or interference fitting.
The anti-twist self-aligning ball head comprises an arc surface and a planar surface, wherein the arc surface comprises a plurality of conical surfaces, a protrusion I is arranged between every two conical surfaces, the radius of the conical surfaces is the same as the radius of the conical hole, the width and height of the protrusions I are smaller than those of the grooves, and the number of protrusions I is the same as the number of the grooves; when the flexible anchor rod is pre-tightened, the protrusions I are embedded into the grooves to ensure the circumferential direction between the anti-twist self-aligning ball head and the tray is fixed; a circular hole is arranged at the center of the anti-twist self-aligning ball head, protrusions II are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II
is a rectangular structure, the width of the protrusions II is smaller than the width of the rectangular grooves by 0.5 to 1 mm, the height of the protrusions II is smaller than the width of the rectangular grooves by 0.5 to 1 mm, and the protrusions II are embedded in the rectangular grooves to limit the torsion of the flexible anchor rod body.
Beneficial effects: due to the utilization of the above technical solution, the present invention has the following advantages over the prior art:
(1) The anchor rod body formed by a steel strand is easy to bend, thus the problem that the length of anchor rods is limited by the height of roadways is solved; as the coal mining depth is increased, it is necessary to build thick anchored rock beams, and use long anchor rods with high strength to control the deformation of the roadways, the breaking load and length of the flexible anchor rod are two times higher than those of ordinary anchor rods, the flexible
Background Art At present, anchor rod supporting technology has been widely applied to coal mine roadways in China, the anchor rod supporting technology was initially used in rock roadways with relatively stable surrounding rocks; later, through improving the rigidity and strength of anchor rod materials, the anchor rod supporting technology could adapt to roadways with various harsh conditions, such as roadways with soft and fractured surrounding rocks and roadways disturbed by mining, etc. The anchor rod supporting mainly utilizes anchor rods driven into preformed boreholes in the surrounding rock of a roadway to integrate the shallow fractured surrounding rock mass with the deep stable rock mass, so as to attain a purpose of controlling the deformation of the roadway and realizing the safety and stability of the roadway.
The anchor rods are very important in the anchor rod supporting system, and there are a variety of anchor rods. With the complexity of roadway conditions, resin anchored pre-stressed anchor cables with small borehole diameter have also been developed and applied to coal mine sites. In summary, thanks to the diversity of anchor rods and anchor cables, the anchor rods and anchor cables can adapt to the complex site conditions of coal mines in China. However, owing to the limitation of roadway height, the length of anchor rods is limited to about 2 m, and the thickness of the anchoring areas with anchor rods is also limited to 2 m, which can't adapt to the complex geological conditions of the current roadways anymore. Although anchor cables can be long enough, the installation process of anchor cables is more complicated when compared with the installation process of anchor rods, and anchor cables have to be tensioned by means of a pump at later period, which restricts the advancing speed of coal roadway. Besides, the longer an anchor cable is, the greater the pre-tightening force is required; however, it is unable to apply sufficient pre-tightening force on site, and the anchoring areas anchored by means of anchor cables can't be reinforced effectively with the limited pre-tightening force, and the roadway deformation can't be controlled well. Therefore, it is urgent to develop an anchor rod that is flexible and installed quickly.
Contents of the Invention Technical Problem: in view of the drawbacks in the prior art, the present invention provides a flexible anchor rod, which is flexible so as to adapt to complex geological conditions, doesn't have to be tensioned by means of a pump, can be installed quickly, and attains a good supporting effect.
Technical Solution: in order to attain the above technical object, the flexible anchor rod provided by the present invention comprises a flexible anchor rod body, a tray, a fixed torque nut, an anti-friction washer and an anti-twist self-aligning ball head, wherein the tray is arranged at a tail section of the flexible anchor rod body, the tray is fixed by the fixed torque nut, and the anti-friction washer and the anti-twist self-aligning ball head are arranged between the tray and the fixed torque nut;
Date Recue/Date Received 2022-03-24 The flexible anchor rod body comprises a steel strand, a tail end of the steel strand is arranged in a connecting sleeve, the connecting sleeve comprises a tail end and a head end, a transition section between the tail end and the head end is provided with a lug boss having an annular structure, a limit cylinder is arranged on the lug boss, a face of the lug boss towards the head end is a vertical end face, a face of the lug boss towards the tail end is a conical face, an outer cylindrical surface of the tail end is provided with threads, the tail end is provided with rectangular grooves arranged in symmetry in an axial direction of the connecting sleeve, the head end is provided with an inner cylindrical hole connected with the steel strand, the steel strand is inserted into the inner 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 between the steel strand and the inner cylindrical hole, and the steel strand and the connecting sleeve are fastened together by squeezing an outer cylindrical surface of the head end of the connecting sleeve.
The limit cylinder comprises a conical cylinder body of the limit cylinder, which comprises a large opening and a small opening, wherein the large opening of the conical cylinder body of the limit cylinder is provided with a flanged edge, and the small opening is provided with an annular bayonet having an inner diameter smaller than the outer diameter of the lug boss by 0.5 to 2 mm;
the limit cylinder is sleeved from the tail end of the connecting sleeve, and the annular bayonet is deformed, beyond the conical end face of the lug boss, and is stuck on the vertical end face of the lug boss; and the limit cylinder is made of a hard plastic material.
The tray comprises a tray body and a stop post, the tray body consists of a circular flanged part and an arch part, a conical hole is provided at the center of the arch part, a larger end of the conical hole faces a top end of the arch part, and a conical surface of the conical hole is provided with a plurality of grooves evenly distributed along the circumference, the number of the grooves is 4 to 8; the stop post is fixed with the flanged part by welding or interference fitting.
The anti-twist self-aligning ball head comprises an arc surface and a planar surface, wherein the arc surface comprises a plurality of conical surfaces, a protrusion I is arranged between every two conical surfaces, the radius of the conical surfaces is the same as the radius of the conical hole, the width and height of the protrusions I are smaller than those of the grooves, and the number of protrusions I is the same as the number of the grooves; when the flexible anchor rod is pre-tightened, the protrusions I are embedded into the grooves to ensure the circumferential direction between the anti-twist self-aligning ball head and the tray is fixed; a circular hole is arranged at the center of the anti-twist self-aligning ball head, protrusions II are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II
is a rectangular structure, the width of the protrusions II is smaller than the width of the rectangular grooves by 0.5 to 1 mm, the height of the protrusions II is smaller than the width of the rectangular grooves by 0.5 to 1 mm, and the protrusions II are embedded in the rectangular grooves to limit the torsion of the flexible anchor rod body.
Beneficial effects: due to the utilization of the above technical solution, the present invention has the following advantages over the prior art:
(1) The anchor rod body formed by a steel strand is easy to bend, thus the problem that the length of anchor rods is limited by the height of roadways is solved; as the coal mining depth is increased, it is necessary to build thick anchored rock beams, and use long anchor rods with high strength to control the deformation of the roadways, the breaking load and length of the flexible anchor rod are two times higher than those of ordinary anchor rods, the flexible
2 Date Recue/Date Received 2022-03-24 anchor rod can effectively adapt to complex mine conditions;
(2) The flexible anchor rod body is connected with the connecting sleeve by squeezing, and the strength of the joint between the two parts can be up to 95% or more of the strength of the rod body, which can meet the requirement for use in the complex conditions on site;
(2) The flexible anchor rod body is connected with the connecting sleeve by squeezing, and the strength of the joint between the two parts can be up to 95% or more of the strength of the rod body, which can meet the requirement for use in the complex conditions on site;
(3) The flexible anchor rod is pre-tightened and mounted by means of a fixed torque nut and doesn't have to be tensioned by means of a pump; compared with the lock tensioning installation method of steel strands, the installation with a fixed torque nut can realize quick installation, and can greatly improve the supporting speed of the anchor rod, thus the advancing speed of the roadway is improved, and the working efficiency is effectively improved, at the same time, the manpower required for transporting equipment is also saved since it is unnecessary to carry a pump;
(4) The limit cylinder in the flexible anchor rod can accurately locate the installation position of the anchor rod, even if the depth of the anchor rod hole is extremely great, the installation length of the connecting sleeve of the flexible anchor rod can be ensured by utilizing the limit cylinder restrained outside the rock mass; thus, it will not lead to the failure of the flexible anchor rod, but has high reliability, besides, it is helpful to ensure a uniform exposed length of the anchor rods and realize the quality standardization of anchor rod supporting in coal mines;
(5) A thorny problem that the flexible anchor rod rotates with the nut when it is pre-tightened with a jumbolter is solved by a structure of grooves and lug bosses on the tray, self-aligning ball head and connecting sleeve of the flexible anchor rod, the flexible anchor rod can apply a greater pre-tightening force under the effect of the anti-friction washer, so that greater pre-tightening force of the anchor rod can be achieved, and the deformation of the roadway can be limited better.
Description of Drawings Fig. 1 is a sectional view of the flexible anchor rod body according to the present invention;
Fig. 2 is a partially enlarged sectional view of the flexible anchor rod body according to the present invention;
Fig. 3 is a sectional view of the connecting sleeve of the flexible anchor rod body according to the present invention;
Fig. 4 is a schematic outline diagram of the connecting sleeve of the flexible anchor rod body according to the present invention;
Fig. 5 is a sectional view of the limit cylinder according to the present invention;
Fig. 6 is a schematic diagram of the flexible anchor rod before pre-tightening according to the present invention;
Fig. 7 is a sectional view of the flexible anchor rod after pre-tightening according to the present invention;
Fig. 8 is a schematic diagram of the anchor rod hole for rock mass construction according to the present invention;
Fig. 9 is a schematic diagram of the tray according to the present invention;
Date Recue/Date Received 2022-03-24 Fig. 10 is a schematic diagram of the anti-twist self-aligning ball head according to the present invention;
Fig. 11 is a schematic diagram of the fixed torque nut according to the present invention;
In the figures: A - rock mass; Al - free face of rock mass; A2 - large hole section; A3 - small hole section; B - flexible anchor rod body; B1 - steel strand, B2 - friction-increasing wire spring, B3 -limit cylinder, B3a - flanged edge, B3b - annular bayonet, B3c - conical cylinder body of limit cylinder, B4 - connecting sleeve, B4a - tail end, B4b - head end, B4c -cylindrical hole, B4d -annular groove, B4e ¨ lug boss, B4f - rectangular groove, C - tray, Cl - tray body, Cla - conical hole, C lb - flanged part, C 1 c - arch part, C 1 d - groove, C2 - stop post;
D - fixed torque nut; D1 -nut body, D2 - fixed torque stop plate, E - anti-friction washer, F - anti-twist self-aligning ball head, Fl - conical surface, F2 - protrusion I, F3 - protrusion II, F4 -circular hole.
Embodiments Hereunder the embodiments of the present invention will be further detailed with reference to the accompanying drawings.
As shown in Figs. 1, 2, 3 and 4, the flexible anchor rod provided by the present invention comprises a flexible anchor rod body B, a tray C, a fixed torque nut D, an anti-friction washer E and an anti-twist self-aligning ball head F, wherein the tray C is arranged at a tail section of the flexible anchor rod body B, the tray C is fixed by the fixed torque nut D, 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 comprises a steel strand B 1, a tail end of the steel strand B1 is arranged in a connecting sleeve B4, the connecting sleeve B4 comprises a tail end B4a and a head end B4b, a transition section between the tail end B4a and the head end B4b is provided with a lug boss B4e having an annular structure, a limit cylinder B3 is arranged on the lug boss B4e, a face of the lug boss B4e towards the head end B4b is a vertical end face, a face of the lug boss B4e towards the tail end B4a is a conical face, an outer cylindrical surface of the tail end B4a is provided with threads, the tail end B4a is provided with rectangular grooves B4f arranged in symmetry in an axial direction of the connecting sleeve B4, the head end B4b is provided with an inner cylindrical hole B4c connected with the steel strand Bl, the inner wall of the inner cylindrical hole B4c is provided with threads, and the bottom of the inner cylindrical hole is provided with an annular groove B4d, the steel strand B1 is inserted into the inner cylindrical hole B4c of the connecting sleeve B4, a friction-increasing wire spring B2 is arranged between the steel strand B1 and the inner cylindrical hole B4c, and the steel strand B1 and the connecting sleeve B4 are fastened together by squeezing an outer cylindrical surface of the head end B4b of the connecting sleeve B4.
As shown in Fig. 5, the limit cylinder B3 comprises a conical cylinder body B3c of the limit cylinder, the conical cylinder body B3c of the limit cylinder comprises a large opening and a small opening, wherein the large opening of the conical cylinder body B3c of the limit cylinder is provided with a flanged edge B3 a, 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 lug boss B4e by 0.5 to 2 mm; the limit cylinder B3 is sleeved from the tail end B4a of the connecting sleeve B4, and the annular bayonet B3b is deformed, beyond the conical end face of the lug boss B4e, and is stuck on the vertical end face of the lug boss B4e; and the limit cylinder B3 is made of a hard plastic material.
Date Recue/Date Received 2022-03-24 As shown in Fig. 9, the tray C comprises a tray body Cl and a stop post C2, the tray body Cl consists of a circular flanged part C lb and an arch part Clc, a conical hole Cla is provided at the center of the arch part Clc, a larger end of the conical hole Cl a faces a top end of the arch part Clc, and a conical surface of the conical hole Clc is provided with a plurality of grooves Cld evenly distributed along the circumference, the number of the grooves Cld is 4 to 8; the stop post C2 is fixed with the flanged part C lb by welding or interference fitting.
As shown in Fig. 10, the anti-twist self-aligning ball head F comprises an arc surface and a planar surface, wherein the arc surface comprises a plurality of conical surfaces Fl, a protrusion I F2 is arranged between every two conical surfaces Fl, the radius of the conical surfaces Fl is the same as the radius of the conical hole Cla, the width and height of the protrusions I F2 are smaller than those of the grooves Cld, and the number of protrusions I F2 is the same as the number of the grooves Cld; when the flexible anchor rod is pre-tightened, the protrusions I
F2 are embedded into the grooves Cld to ensure the circumferential direction between the anti-twist self-aligning ball head F and the tray C is fixed ; a circular hole F4 is arranged at the center of the anti-twist self-aligning ball head F, protrusions II F3 are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II F3is a rectangular structure, the width of the protrusions II F3 is smaller than the width of the rectangular grooves B4f by 0.5 to 1 mm, the height of the protrusions II F3 is smaller than the width of the rectangular grooves B4f by 0.5 to 1 mm, and the protrusions II F3 are embedded in the rectangular grooves B4f to limit the torsion of the flexible anchor rod body B.
As shown in Fig. 11, the fixed torque nut D comprises a nut body D1 and a fixed torque stop plate D2.
As shown in Figs. 6 and 7, a construction method for the flexible anchor rod comprises the following steps:
step a: drilling a stepped anchor rod hole in a rock mass A, wherein the stepped anchor rod hole near the excavation face Al is the large hole section A2, while the rest sections of the stepped anchor rod hole are the small hole sections A3, the diameter of the large hole section A2 is greater than the diameter of the squeezed head end B4b by 4 to 10 mm, and the depth of the large hole section A2 meets a requirement that the flanged edge of the limit cylinder B3 is tightly attached to the excavation face Al after the flexible anchor rod body B is inserted into the anchor rod hole;
step b: placing an anchoring agent into the stepped anchor rod hole, pressing the flexible anchor rod body B against the anchoring agent, pushing the anchoring agent to the bottom of the stepped anchor rod hole by means of the front part of the flexible anchor rod body B, rotating the fixed torque nut D by means of a jumbolter so as to drive the flexible anchor rod body B and the anti-twist self-aligning ball head F to rotate together, while pushing the flexible anchor rod by means of the jumbolter to stir the anchoring agent homogeneously, rotating and advancing further till the flanged edge of the limit cylinder B3 is tightly attached to the excavation face Al, then stopping the jumbolter, and waiting for 30 seconds for the anchoring agent to cure;
step c: starting the jumbolter 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 further screws in and presses the anti-friction washer E, the anti-twist self-aligning ball head F and the tray C along the connecting sleeve B4, so that the stop post C2 on the tray C is stuck to the excavation face Al to prevent the tray C from rotating; at this point, the protrusions I F2 on the anti-twist self-aligning ball head F
are stuck into the grooves Cld in the tray C, thereby prevent the anti-twist self-aligning ball head Date Recue/Date Received 2022-03-24 F from rotating, the anti-twist self-aligning ball head F limits the rotation of the connecting sleeve B4 via the protrusions II F3, and thereby limits the rotation of the flexible anchor rod body B, so that the flexible anchor rod body B doesn't rotate when the jumbolter applies the pre-tightening force, which is 60 to 100 l(N;
step d: withdrawing the jumbolter and repeating the steps ac to construct for a next flexible anchor rod.
Description of Drawings Fig. 1 is a sectional view of the flexible anchor rod body according to the present invention;
Fig. 2 is a partially enlarged sectional view of the flexible anchor rod body according to the present invention;
Fig. 3 is a sectional view of the connecting sleeve of the flexible anchor rod body according to the present invention;
Fig. 4 is a schematic outline diagram of the connecting sleeve of the flexible anchor rod body according to the present invention;
Fig. 5 is a sectional view of the limit cylinder according to the present invention;
Fig. 6 is a schematic diagram of the flexible anchor rod before pre-tightening according to the present invention;
Fig. 7 is a sectional view of the flexible anchor rod after pre-tightening according to the present invention;
Fig. 8 is a schematic diagram of the anchor rod hole for rock mass construction according to the present invention;
Fig. 9 is a schematic diagram of the tray according to the present invention;
Date Recue/Date Received 2022-03-24 Fig. 10 is a schematic diagram of the anti-twist self-aligning ball head according to the present invention;
Fig. 11 is a schematic diagram of the fixed torque nut according to the present invention;
In the figures: A - rock mass; Al - free face of rock mass; A2 - large hole section; A3 - small hole section; B - flexible anchor rod body; B1 - steel strand, B2 - friction-increasing wire spring, B3 -limit cylinder, B3a - flanged edge, B3b - annular bayonet, B3c - conical cylinder body of limit cylinder, B4 - connecting sleeve, B4a - tail end, B4b - head end, B4c -cylindrical hole, B4d -annular groove, B4e ¨ lug boss, B4f - rectangular groove, C - tray, Cl - tray body, Cla - conical hole, C lb - flanged part, C 1 c - arch part, C 1 d - groove, C2 - stop post;
D - fixed torque nut; D1 -nut body, D2 - fixed torque stop plate, E - anti-friction washer, F - anti-twist self-aligning ball head, Fl - conical surface, F2 - protrusion I, F3 - protrusion II, F4 -circular hole.
Embodiments Hereunder the embodiments of the present invention will be further detailed with reference to the accompanying drawings.
As shown in Figs. 1, 2, 3 and 4, the flexible anchor rod provided by the present invention comprises a flexible anchor rod body B, a tray C, a fixed torque nut D, an anti-friction washer E and an anti-twist self-aligning ball head F, wherein the tray C is arranged at a tail section of the flexible anchor rod body B, the tray C is fixed by the fixed torque nut D, 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 comprises a steel strand B 1, a tail end of the steel strand B1 is arranged in a connecting sleeve B4, the connecting sleeve B4 comprises a tail end B4a and a head end B4b, a transition section between the tail end B4a and the head end B4b is provided with a lug boss B4e having an annular structure, a limit cylinder B3 is arranged on the lug boss B4e, a face of the lug boss B4e towards the head end B4b is a vertical end face, a face of the lug boss B4e towards the tail end B4a is a conical face, an outer cylindrical surface of the tail end B4a is provided with threads, the tail end B4a is provided with rectangular grooves B4f arranged in symmetry in an axial direction of the connecting sleeve B4, the head end B4b is provided with an inner cylindrical hole B4c connected with the steel strand Bl, the inner wall of the inner cylindrical hole B4c is provided with threads, and the bottom of the inner cylindrical hole is provided with an annular groove B4d, the steel strand B1 is inserted into the inner cylindrical hole B4c of the connecting sleeve B4, a friction-increasing wire spring B2 is arranged between the steel strand B1 and the inner cylindrical hole B4c, and the steel strand B1 and the connecting sleeve B4 are fastened together by squeezing an outer cylindrical surface of the head end B4b of the connecting sleeve B4.
As shown in Fig. 5, the limit cylinder B3 comprises a conical cylinder body B3c of the limit cylinder, the conical cylinder body B3c of the limit cylinder comprises a large opening and a small opening, wherein the large opening of the conical cylinder body B3c of the limit cylinder is provided with a flanged edge B3 a, 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 lug boss B4e by 0.5 to 2 mm; the limit cylinder B3 is sleeved from the tail end B4a of the connecting sleeve B4, and the annular bayonet B3b is deformed, beyond the conical end face of the lug boss B4e, and is stuck on the vertical end face of the lug boss B4e; and the limit cylinder B3 is made of a hard plastic material.
Date Recue/Date Received 2022-03-24 As shown in Fig. 9, the tray C comprises a tray body Cl and a stop post C2, the tray body Cl consists of a circular flanged part C lb and an arch part Clc, a conical hole Cla is provided at the center of the arch part Clc, a larger end of the conical hole Cl a faces a top end of the arch part Clc, and a conical surface of the conical hole Clc is provided with a plurality of grooves Cld evenly distributed along the circumference, the number of the grooves Cld is 4 to 8; the stop post C2 is fixed with the flanged part C lb by welding or interference fitting.
As shown in Fig. 10, the anti-twist self-aligning ball head F comprises an arc surface and a planar surface, wherein the arc surface comprises a plurality of conical surfaces Fl, a protrusion I F2 is arranged between every two conical surfaces Fl, the radius of the conical surfaces Fl is the same as the radius of the conical hole Cla, the width and height of the protrusions I F2 are smaller than those of the grooves Cld, and the number of protrusions I F2 is the same as the number of the grooves Cld; when the flexible anchor rod is pre-tightened, the protrusions I
F2 are embedded into the grooves Cld to ensure the circumferential direction between the anti-twist self-aligning ball head F and the tray C is fixed ; a circular hole F4 is arranged at the center of the anti-twist self-aligning ball head F, protrusions II F3 are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II F3is a rectangular structure, the width of the protrusions II F3 is smaller than the width of the rectangular grooves B4f by 0.5 to 1 mm, the height of the protrusions II F3 is smaller than the width of the rectangular grooves B4f by 0.5 to 1 mm, and the protrusions II F3 are embedded in the rectangular grooves B4f to limit the torsion of the flexible anchor rod body B.
As shown in Fig. 11, the fixed torque nut D comprises a nut body D1 and a fixed torque stop plate D2.
As shown in Figs. 6 and 7, a construction method for the flexible anchor rod comprises the following steps:
step a: drilling a stepped anchor rod hole in a rock mass A, wherein the stepped anchor rod hole near the excavation face Al is the large hole section A2, while the rest sections of the stepped anchor rod hole are the small hole sections A3, the diameter of the large hole section A2 is greater than the diameter of the squeezed head end B4b by 4 to 10 mm, and the depth of the large hole section A2 meets a requirement that the flanged edge of the limit cylinder B3 is tightly attached to the excavation face Al after the flexible anchor rod body B is inserted into the anchor rod hole;
step b: placing an anchoring agent into the stepped anchor rod hole, pressing the flexible anchor rod body B against the anchoring agent, pushing the anchoring agent to the bottom of the stepped anchor rod hole by means of the front part of the flexible anchor rod body B, rotating the fixed torque nut D by means of a jumbolter so as to drive the flexible anchor rod body B and the anti-twist self-aligning ball head F to rotate together, while pushing the flexible anchor rod by means of the jumbolter to stir the anchoring agent homogeneously, rotating and advancing further till the flanged edge of the limit cylinder B3 is tightly attached to the excavation face Al, then stopping the jumbolter, and waiting for 30 seconds for the anchoring agent to cure;
step c: starting the jumbolter 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 further screws in and presses the anti-friction washer E, the anti-twist self-aligning ball head F and the tray C along the connecting sleeve B4, so that the stop post C2 on the tray C is stuck to the excavation face Al to prevent the tray C from rotating; at this point, the protrusions I F2 on the anti-twist self-aligning ball head F
are stuck into the grooves Cld in the tray C, thereby prevent the anti-twist self-aligning ball head Date Recue/Date Received 2022-03-24 F from rotating, the anti-twist self-aligning ball head F limits the rotation of the connecting sleeve B4 via the protrusions II F3, and thereby limits the rotation of the flexible anchor rod body B, so that the flexible anchor rod body B doesn't rotate when the jumbolter applies the pre-tightening force, which is 60 to 100 l(N;
step d: withdrawing the jumbolter and repeating the steps ac to construct for a next flexible anchor rod.
6 Date Recue/Date Received 2022-03-24
Claims (4)
1. A flexible anchor rod, characterized in that: comprising a flexible anchor rod body (B), a tray (C), a fixed torque nut (D), an anti-friction washer (E) and an anti-twist self-aligning ball head (F), wherein the tray (C) is arranged at a tail section of the flexible anchor rod body (B), the tray (C) is fixed by the fixed torque nut (D) , 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) comprises a steel strand (B1), a tail end of the steel strand (B1) is arranged in a connecting sleeve (B4), the connecting sleeve (B4) comprises a tail end (B4a) and a head end (B4b), a transition section between the tail end (B4a) and the head end (B4b) is provided with a lug boss (B4e) having an annular structure, a limit cylinder (B3) is arranged on the lug boss (B4e), a face of the lug boss (B4e) towards the head end (B4b) is a vertical end face, a face of the lug boss (B4e) towards the tail end (B4a) is a conical face, an outer cylindrical surface of the tail end (B4a) is provided with threads, the tail end (B4a) is provided with rectangular grooves (B4f) arranged in symmetry in an axial direction of the connecting sleeve (B4), the head end (B4b) is provided with an inner cylindrical hole (B4c) connected with the steel strand (B1), the bottom of the inner cylindrical hole (B4c) is provided with an annular groove (B4d), the steel strand (B1) is inserted into the inner cylindrical hole (B4c) of the connecting sleeve (B4), a friction-increasing wire spring (B2) is arranged between the steel strand (B1) and the inner cylindrical hole (B4c), and the steel strand (B1) and the connecting sleeve (B4) are fastened together by squeezing an outer cylindrical surface of the head end (B4b) of the connecting sleeve (B4).
the flexible anchor rod body (B) comprises a steel strand (B1), a tail end of the steel strand (B1) is arranged in a connecting sleeve (B4), the connecting sleeve (B4) comprises a tail end (B4a) and a head end (B4b), a transition section between the tail end (B4a) and the head end (B4b) is provided with a lug boss (B4e) having an annular structure, a limit cylinder (B3) is arranged on the lug boss (B4e), a face of the lug boss (B4e) towards the head end (B4b) is a vertical end face, a face of the lug boss (B4e) towards the tail end (B4a) is a conical face, an outer cylindrical surface of the tail end (B4a) is provided with threads, the tail end (B4a) is provided with rectangular grooves (B4f) arranged in symmetry in an axial direction of the connecting sleeve (B4), the head end (B4b) is provided with an inner cylindrical hole (B4c) connected with the steel strand (B1), the bottom of the inner cylindrical hole (B4c) is provided with an annular groove (B4d), the steel strand (B1) is inserted into the inner cylindrical hole (B4c) of the connecting sleeve (B4), a friction-increasing wire spring (B2) is arranged between the steel strand (B1) and the inner cylindrical hole (B4c), and the steel strand (B1) and the connecting sleeve (B4) are fastened together by squeezing an outer cylindrical surface of the head end (B4b) of the connecting sleeve (B4).
2. The flexible anchor rod according to claim 1, wherein the limit cylinder (B3) comprises a conical cylinder body (B3 c) of the limit cylinder, the conical cylinder body (B3c) of the limit cylinder comprises a large opening and a small opening, wherein the large opening of the conical cylinder body (B3c) of the limit cylinder is provided with a flanged edge (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 lug boss (B4e) by 0.5 to 2 mm; the limit cylinder (B3) is sleeved from the tail end (B4a) of the connecting sleeve (B4), and the annular bayonet (B3b) is deformed, beyond the conical end face of the lug boss (B4e), and is stuck on the vertical end face of the lug boss (B4e); and the limit cylinder (B3) is made of a hard plastic material.
3. The flexible anchor rod according to claim 1, wherein the tray (C) comprises a tray body (C1) and a stop post (C2), the tray body (C1) consists of a circular flanged part (C1b) and an arch part (C1c), a conical hole (Cla) is provided at the center of the arch part (C1c), a larger end of the conical hole (Cla) faces a top end of the arch part (C1c), and a conical surface of the conical hole (C1c) is provided with a plurality of grooves (C1d) evenly distributed along the circumference, the number of grooves (Cld) is 4 to 8, the stop post (C2) is fixed with the flanged part (Clb) by welding or interference fitting.
4. The flexible anchor rod according to claims 1, 2 or 3, wherein the anti-twist self-aligning ball head (F) comprises an arc surface and a planar surface, wherein the arc surface comprises a plurality of conical surfaces (F1), a protrusion I (F2) is arranged between every two conical surfaces (F 1), the radius of the conical surfaces (F 1) is the same as the radius of the conical hole (C 1 a), the width and height of the protrusions I (F2) are smaller than those of the grooves (C 1 d), and the number of protrusions I (F2) is the same as the number of the grooves (C 1 d);
when the flexible anchor rod is pre-tightened, the protrusions I (F2) are embedded into the grooves (C 1 d) to ensure the circumferential direction between the anti-twist self-aligning ball head (F) and the tray (C) is fixed, a circular hole (F4) is arranged at the center of the anti-twist self-aligning ball head (F), protrusions II (F3) are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II
(F3) has a rectangular structure, the width of the protrusions II (F3) is smaller than the width of the rectangular grooves (B4f) by 0.5 to 1 mm, the height of the protrusions II (F3) is smaller than the width of the rectangular grooves (B4f) by 0.5 to 1 mm, and the protrusions II (F3) are embedded in the rectangular grooves (B4f) to limit the torsion of the flexible anchor rod body (B).
when the flexible anchor rod is pre-tightened, the protrusions I (F2) are embedded into the grooves (C 1 d) to ensure the circumferential direction between the anti-twist self-aligning ball head (F) and the tray (C) is fixed, a circular hole (F4) is arranged at the center of the anti-twist self-aligning ball head (F), protrusions II (F3) are arranged in the circular hole and distributed on the opposite sides, the cross section of the protrusions II
(F3) has a rectangular structure, the width of the protrusions II (F3) is smaller than the width of the rectangular grooves (B4f) by 0.5 to 1 mm, the height of the protrusions II (F3) is smaller than the width of the rectangular grooves (B4f) by 0.5 to 1 mm, and the protrusions II (F3) are embedded in the rectangular grooves (B4f) to limit the torsion of the flexible anchor rod body (B).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073743.4A CN109538266B (en) | 2019-01-25 | 2019-01-25 | Flexible anchor rod |
| CN201910073743.4 | 2019-01-25 | ||
| PCT/CN2019/090615 WO2020151161A1 (en) | 2019-01-25 | 2019-06-11 | Flexible anchor rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3156369A1 CA3156369A1 (en) | 2020-07-30 |
| CA3156369C true CA3156369C (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CA3156369A Active CA3156369C (en) | 2019-01-25 | 2019-06-11 | Flexible anchor rod |
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| Country | Link |
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| CN (1) | CN109538266B (en) |
| CA (1) | CA3156369C (en) |
| WO (1) | WO2020151161A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538266B (en) * | 2019-01-25 | 2023-10-03 | 中国矿业大学 | Flexible anchor rod |
| CN112502759A (en) * | 2021-01-06 | 2021-03-16 | 福州大学 | Bendable anchor rod for tunnel surrounding rock support in narrow space and construction method |
| CN113047879B (en) * | 2021-03-17 | 2023-03-17 | 湖南科技大学 | Extendable double-yielding anchor cable structure and use method thereof |
| CN113153397B (en) * | 2021-04-28 | 2023-06-27 | 中交第二航务工程局有限公司 | Sleeve device for controlling outcrop length of tunnel anchor rod and use method thereof |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160615A (en) * | 1978-03-23 | 1979-07-10 | The International Nickel Company, Inc. | Cable rock anchor |
| DE8812655U1 (en) * | 1988-10-08 | 1989-03-30 | Dyckerhoff & Widmann Ag, 8000 Muenchen, De | |
| US5054146A (en) * | 1988-12-08 | 1991-10-08 | Videx-Wire Products (Pty.) Limited | Anchor bolt |
| DE4204533C2 (en) * | 1992-02-15 | 1994-03-17 | Gd Anker Gmbh & Co Kg | Injection drill anchor |
| CN2448927Y (en) * | 2000-06-29 | 2001-09-19 | 宋改缺 | Steel stranded wire anchor rod |
| AUPS266202A0 (en) * | 2002-05-30 | 2002-06-20 | Industrial Rollformers Pty Limited | Threaded bar |
| CA2543755C (en) * | 2006-04-18 | 2012-12-11 | Mansour Mining Inc. | Detachable anchor bolt mixing head for use in mine roof support systems and method of using same |
| CN201013395Y (en) * | 2007-01-10 | 2008-01-30 | 山西潞安矿业(集团)有限责任公司 | Positive anchor type reclaimable resin round bar anchor rod |
| CN201013394Y (en) * | 2007-01-10 | 2008-01-30 | 山西潞安矿业(集团)有限责任公司 | Inverse anchor type reclaimable resin round bar anchor rod |
| AT504211B1 (en) * | 2007-03-12 | 2008-04-15 | Atlas Copco Mai Gmbh | Anchor i.e. adhesive anchor, has anchor rod forming continuous thread in threaded bore, as soon as anchor rod fits tightly in bore hole, when anchor nut is rotated relative to anchor rod |
| CN101994315B (en) * | 2010-10-16 | 2012-02-01 | 山东科技大学 | Full-length adhesive prestressed anchor rod and construction method thereof |
| CN202560272U (en) * | 2012-02-15 | 2012-11-28 | 于守东 | Flexible anchor pole |
| CN102900448A (en) * | 2012-09-26 | 2013-01-30 | 天地科技股份有限公司 | Anti-self-locking anchor-bolt support plate |
| CN202926355U (en) * | 2012-10-31 | 2013-05-08 | 于守东 | Hollow grouting anchor cable for mine |
| CN205135679U (en) * | 2015-10-28 | 2016-04-06 | 天地科技股份有限公司 | Slip casting anchor bar |
| CN105350994B (en) * | 2015-10-28 | 2017-10-03 | 天地科技股份有限公司 | A kind of grouted anchor bar and its application method |
| CN205778967U (en) * | 2016-06-07 | 2016-12-07 | 于守东 | A kind of flexible roof bolt |
| CN105937403A (en) * | 2016-06-07 | 2016-09-14 | 于守东 | Flexible anchor rod |
| CN106337692B (en) * | 2016-11-25 | 2018-08-24 | 中国矿业大学 | It is a kind of be suitable for weak coal petrography from boring from anchor extensible anchor pole and its anchoring process |
| CN206860215U (en) * | 2017-04-17 | 2018-01-09 | 安徽福淮矿山科技有限公司 | A kind of antifriction pad and pallet |
| CN107060854A (en) * | 2017-04-17 | 2017-08-18 | 安徽福淮矿山科技有限公司 | A kind of antifriction pad and pallet and its method for testing of related bolt pretension size |
| CN108049402B (en) * | 2018-01-25 | 2023-06-16 | 西南科技大学 | Prestressed anchor rod |
| CN209621351U (en) * | 2019-01-25 | 2019-11-12 | 中国矿业大学 | A kind of flexible roof bolt |
| CN109538266B (en) * | 2019-01-25 | 2023-10-03 | 中国矿业大学 | Flexible anchor rod |
-
2019
- 2019-01-25 CN CN201910073743.4A patent/CN109538266B/en active Active
- 2019-06-11 CA CA3156369A patent/CA3156369C/en active Active
- 2019-06-11 WO PCT/CN2019/090615 patent/WO2020151161A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN109538266A (en) | 2019-03-29 |
| CA3156369A1 (en) | 2020-07-30 |
| WO2020151161A1 (en) | 2020-07-30 |
| CN109538266B (en) | 2023-10-03 |
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