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CN-121993238-A - Constant-resistance energy-absorbing anchor cable and application method thereof

CN121993238ACN 121993238 ACN121993238 ACN 121993238ACN-121993238-A

Abstract

The invention discloses a constant-resistance energy-absorbing anchor cable and an application method thereof. The constant-resistance energy-absorbing anchor cable comprises an anchor cable, a tray, a shrink sleeve, a pressure-releasing pipe and a lockset. One end of the anchor cable is anchored in the rock mass, the other end of the anchor cable passes through the pressure-yielding pipe and is fixed with the lockset, and the tray is abutted on the rock wall. The inner end of the shrink sleeve penetrates through the tray and is arranged in the rock mass. The pressure yielding pipe comprises a cylindrical pipe section, the pressure yielding pipe radially contracts and deforms in the contraction sleeve, a spiral structure is arranged on the outer wall of the cylindrical pipe section, the spiral direction of the spiral structure is opposite to that of the anchor cable, and the spiral structure and the anchor cable form a bidirectional torque balance structure. The rear end of the cylindrical pipe section is abutted to the lock. According to the invention, the spiral structure is arranged on the pressure-yielding pipe, so that the pressure-yielding pipe generates torsion opposite to the anchor cable in the extrusion deformation process in the shrink sleeve, and the opposite twisting directions of the pressure-yielding pipe and the anchor cable can offset the rotation torsion mutually, so that the stable extrusion deformation of the pressure-yielding pipe in the shrink sleeve is realized.

Inventors

  • WANG QI
  • JIANG BEI
  • WANG SHUAI

Assignees

  • 中国矿业大学(北京)
  • 北京力岩科技有限公司

Dates

Publication Date
20260508
Application Date
20260302

Claims (10)

  1. 1. The constant-resistance energy-absorbing anchor cable is characterized by comprising an anchor cable (2), a tray (3), a shrink sleeve (4), a pressure-releasing pipe (5) and a lockset (6); One end of the anchor cable (2) is anchored in the rock mass (1), and the other end of the anchor cable (2) passes through the yielding pipe (5) and is fixed with the lockset (6); The inner end of the shrinkage sleeve (4) penetrates through the tray (3) and is arranged in the rock mass (1), the outer end part of the shrinkage sleeve (4) is abutted against the outer side of the tray (3), the inner cavity of the shrinkage sleeve (4) is sequentially provided with a containing cavity (41), a reducing cavity (42) and a guiding cavity (43) from the outer side to the inner side, the diameter of the containing cavity (41) is larger than that of the guiding cavity (43), and the diameter of the reducing cavity (42) is gradually reduced from one side of the containing cavity (41) to one side of the guiding cavity (43); The compression pipe (5) radially contracts and deforms in the contraction sleeve (4), the compression pipe (5) comprises a cylindrical pipe section (51), the outer diameter of the cylindrical pipe section (51) is larger than that of the guide cavity (43), and the outer diameter of the cylindrical pipe section (51) is smaller than that of the large opening side of the reducing cavity (42), a spiral structure (53) is arranged on the outer wall of the cylindrical pipe section (51), the spiral direction of the spiral structure (53) is opposite to that of the anchor rope (2), and the spiral structure (53) and the anchor rope (2) form a bidirectional torque balance structure; The rear end of the cylindrical pipe section (51) is abutted against the lock (6); In the initial state, the front end of the cylindrical pipe section (51) is deformed in advance to extend out of the guide cavity (43), most of the cylindrical pipe section (51) is positioned in the accommodating cavity (41), and when the anchor cable (2) is stressed, the lock (6) extrudes the pressure-yielding pipe (5) so that the pressure-yielding pipe (5) moves forward in the shrink sleeve (4).
  2. 2. The constant-resistance energy-absorbing anchor cable according to claim 1, wherein an anchor hole (11) is formed in the rock body (1), a first reaming (12) and a second reaming (13) are coaxially formed at the outer end of the anchor hole (11) in sequence, the second reaming (13) is positioned at the outer side of the first reaming (12), and the diameter of the first reaming (12) is smaller than that of the second reaming (13); one end of the anchor cable (2) is anchored at the inner side of an anchor hole (11) of the rock mass (1); the inner end of the shrink sleeve (4) is abutted against the step surface, and the guide cavity (43) faces the first reaming (12).
  3. 3. The constant resistance energy absorbing anchor cable of claim 1, wherein the helical structure (53) is a single or multi-headed helical fin structure disposed on the outer wall of the cylindrical tube section (51); in the process that the cylindrical pipe section (51) enters the reducing cavity (42), the spiral fin structure is gradually separated from the outer wall of the cylindrical pipe section (51); the height of the spiral fin structure is 2-5 mm.
  4. 4. A constant resistance energy absorbing anchor cable according to claim 3, wherein the helical structure (53) is a helical groove formed in the outer wall of the cylindrical pipe section (51); The cross section of the spiral groove is one of a rectangular groove, a conical groove, a trapezoid groove or a semicircular groove.
  5. 5. The constant resistance energy-absorbing anchor cable according to claim 4, wherein the depth H of the spiral groove and the wall thickness W of the yielding pipe (5) are equal to or less than 5% W and equal to or less than 30% W.
  6. 6. The constant resistance energy absorbing anchor cable of claim 4, wherein when the cross section of the spiral groove is rectangular, the groove width D and the groove depth H satisfy d= (1-5) H.
  7. 7. The constant resistance energy-absorbing anchor cable according to claim 1, wherein the pre-deformation amount of the pressure pipe (5) is 5-35 mm.
  8. 8. The constant resistance energy-absorbing anchor cable according to claim 1, wherein the front end of the cylindrical pipe section (51) gradually contracts towards the end to form a truncated cone pipe section (52), and the truncated cone pipe section (52) is used for guiding the cylindrical pipe section (51) into the reducing cavity (42) of the shrink sleeve (4) to radially shrink and deform the pressure-releasing pipe (5).
  9. 9. The constant resistance energy-absorbing anchor cable according to claim 8, wherein the inclination angle phi of the diameter-variable cavity (42) of the shrink sleeve (4) is not deviated from the inclination angle alpha of the round table section of the yielding pipe by more than 5 degrees, and the inclination angle phi of the diameter-variable cavity (42) of the shrink sleeve (4) is in the range of (6-65 degrees).
  10. 10. The application method of the constant-resistance energy-absorbing anchor cable is based on the constant-resistance energy-absorbing anchor cable of any one of claims 1-9, and is characterized by comprising the following steps: S1, preassembling a yielding pipe (5) and a shrink sleeve (4) in a factory, applying pressure to the yielding pipe (5) through hydraulic equipment, and pre-deforming a truncated cone pipe section (52) of the yielding pipe (5) to extend out of a guide cavity (43); S2, drilling the rock mass (1) on site, and inserting an anchoring agent and the end part of the anchor cable (2) positioned at the inner side of the rock mass (1) to finish anchoring; s3, after the yielding pipe (5) and the shrink sleeve (4) are assembled into an integral structure, sequentially penetrating through the tray (3) and the anchor cable (2) along the axial direction of the anchor cable (2); The anchor cable (2) is penetrated in an inner cavity channel of the pressure-releasing pipe (5), and the shrink sleeve (4) is penetrated in a preset mounting through hole of the tray (3); S4, locking and connecting the anchor cable (2) and the yielding pipe (5) by using a lock (6) to form a constant-resistance system.

Description

Constant-resistance energy-absorbing anchor cable and application method thereof Technical Field The invention relates to the technical field of geotechnical engineering reinforcement, in particular to a constant-resistance energy-absorbing anchor cable and an application method thereof. Background Along with the continuous expansion of the construction scale of underground engineering, the construction depth of the engineering is continuously increased, and in the deep engineering construction of tunnels, roadways, chambers and the like, complex geological conditions such as high stress, extremely soft rock, strong disturbance, fault zones and the like are faced, so that the surrounding rock on site is easy to deform and destroy. The traditional anchor cable is easy to break due to insufficient deformation and energy absorption capacity, and engineering safety and stability are seriously threatened. The existing large-deformation anchor cable technology breaks through the limitation of the traditional structure to a certain extent, but has various defects that part of the technology (such as patent CN 215256268U) depends on metal plastic deformation to realize yielding, and when the anchor cable (spiral structure steel strand) bears axial tension, the anchor cable is influenced by the spiral form of the space of the anchor cable, so that reverse torque can be generated. The torsion action can cause the anchor cable to twist, so as to drive the deformation assembly (such as the shrinkage tube in the pipe jacking type structure) matched with the anchor cable to synchronously rotate. Because the shrinkage tube and the constraint ring need to be coaxially extruded to realize stable radial shrinkage, and the coaxiality of the shrinkage tube and the constraint ring can be damaged by eccentricity caused by torsion, the shrinkage tube is unevenly extruded and deformed in the constraint ring, particularly, partial areas are excessively extruded to cause early crushing, partial areas are insufficiently contacted to cause sudden drop of resistance, and finally, the constant resistance yielding characteristic of the anchor cable is invalid, and the energy absorption stability is greatly reduced. What is needed is an anchor cable that can effectively solve the problem of torsion eccentricity of the anchor cable and realize stable high-strength constant-resistance yielding so as to meet the requirements of complex geotechnical engineering on efficient and reliable support. Disclosure of Invention In order to solve the problems, the invention provides the constant-resistance energy-absorbing anchor cable and the application method thereof, and the constant-resistance energy-absorbing anchor cable can effectively solve the problem of torsion and eccentricity of the anchor cable and realize the anchor cable with stable high-strength constant-resistance yielding so as to meet the requirements of complex geotechnical engineering on efficient and reliable support. According to a first aspect of the invention, a constant-resistance energy-absorbing anchor cable is provided, and comprises an anchor cable, a tray, a shrink sleeve, a pressure-releasing pipe and a lockset; One end of the anchor cable is anchored in the rock mass, and the other end of the anchor cable passes through the yielding pipe and is fixed with the lockset; the inner end of the shrink sleeve penetrates through the tray and is arranged in the rock mass, and the outer end part of the shrink sleeve is abutted against the outer side of the tray; The pressure-yielding pipe radially contracts and deforms in the contraction sleeve, and comprises a cylindrical pipe section, wherein the outer diameter of the cylindrical pipe section is larger than the diameter of the guide cavity, and the outer diameter of the cylindrical pipe section is smaller than the diameter of the large opening side of the reducing cavity; the rear end of the cylindrical pipe section is abutted against the lock; In the initial state, the front end of the cylindrical pipe section is deformed in advance and extends out of the guide cavity, most of the cylindrical pipe section is positioned in the accommodating cavity, and when the anchor cable is stressed, the lock presses the pressure-yielding pipe to enable the pressure-yielding pipe to move forward in the shrink sleeve. According to the constant-resistance energy-absorbing anchor cable, an anchor hole is formed in a rock body, a first reaming and a second reaming are sequentially and coaxially formed at the outer end of the anchor hole, the second reaming is positioned at the outer side of the first reaming, and the diameter of the first reaming is smaller than that of the second reaming; one end of the anchor cable is anchored at the inner side of the anchor hole of the rock mass; The inner end of the shrink sleeve is abutted to the step surface, and the guide cavity faces the first reaming. According to the constant-resistance energy-absorbi