Mining Impact-Resistant Anchor Cable with Built-in High-Strength Fiber Rope and its Construction Method

Abstract

This invention discloses a construction method for a mine impact-resistant anchor cable with built-in high-strength fiber rope, relating to the field of coal mine roadway support technology. The mine impact-resistant anchor cable includes: a cable body structure, an energy-dissipating structure, and auxiliary structures. The cable body structure consists of a steel pipe sleeve, a guide cone, and a high-strength fiber rope, which is a rope structure formed by multiple strands of fiber bundles wound together. It includes at least two energy-dissipating structures, each consisting of energy-dissipating reinforcing bars and fastening devices. The tensile breaking load of the energy-dissipating reinforcing bars is lower than the tensile load of the high-strength fiber rope, and the length at break is not greater than the length of the high-strength fiber rope between the fastening devices. After the energy-dissipating reinforcing bars fail, the high-strength fiber rope begins to bear the load. The auxiliary structures include an anchor cable tray and an anchoring lock. The anchor cable tray consists of a rubber pad with a honeycomb structure and a steel plate, and prestress is applied by an anchor cable tensioning machine.

Description

Technical Field

[0001] This invention relates to the field of coal mine roadway support technology, and in particular to a mine impact-resistant anchor cable with built-in high-strength fiber rope and its construction method. Background Technology

[0002] Anchor cables, as an active support structure, are widely used in the stability control of surrounding rock in underground mine roadways. Traditional anchor cables, made of wound steel strands, are limited by the tensile strength of the steel strands and can no longer meet the fundamental requirements of underground engineering for high-strength support structures. At the same time, the corrosion problem of steel has seriously affected the long-term stability of key projects using traditional steel anchor cables as the main support method, posing certain safety hazards. With the continuous increase in the depth of underground mining, the instantaneous breakage of steel anchor cables under impact energy has seriously threatened the personal safety of frontline coal miners. Therefore, developing a new type of anchor cable structure that combines high tensile strength, corrosion resistance, and impact resistance has become a fundamental requirement for the long-term development of deep roadway surrounding rock stability control technology. In recent years, fiber-reinforced composite materials have been widely used in civil engineering and underground engineering fields due to their advantages such as lightweight and high strength (specific strength more than 10 times that of steel wire of the same strength cross-section), corrosion resistance, and strong design flexibility. The high-strength mechanical properties of fiber-reinforced composite materials make it theoretically feasible to replace steel strands in the production of new anchor cable structures. However, compared with steel strand, fiber-reinforced composite materials have a smaller ultimate tensile breaking strain, and when used alone, they cannot meet the requirements of the support material deformation capacity for large deformation of the surrounding rock in deep impact roadways. Summary of the Invention

[0003] The purpose of this invention is to address the technical deficiencies of traditional anchor cable structures in the support process of deep mine rockburst roadways, and to provide a mine-use impact-resistant anchor cable with built-in high-strength fiber rope, which has high tensile strength, good corrosion resistance and impact resistance, so as to enhance the effectiveness of surrounding rock stability control in deep rockburst roadways and help coal mines produce safely and efficiently.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a mining impact-resistant anchor cable with an internal high-strength fiber rope, comprising a cable body structure, an energy-dissipating structure, and auxiliary structures. The cable body structure consists of a high-strength fiber rope, a steel pipe sleeve, and a guide cone. The high-strength fiber rope is a rope structure formed by multiple strands of fiber wound together. One end of the steel pipe sleeve is hollow, and the other end is a solid structure 10 cm in length. A guide hole is provided at the solid end of the steel pipe sleeve, penetrating the solid structure. One end of the guide cone is a positioning bolt, and the other end is a U-shaped buckle. The positioning bolt of the guide cone can extend through the guide hole at the solid end of the steel pipe sleeve to the outside of the steel pipe sleeve and be tightened using a positioning nut. The high-strength fiber rope passes through the U-shaped buckle at the other end of the guide cone and is then secured using a buckle bolt.

[0006] The energy-dissipating structure consists of a fastening device and energy-dissipating reinforcing bars. The fastening device is a Y-shaped structure, composed of a hollow screw, a locking nut, and a fastening core. The Y-shaped structure can be divided into a single-branch side and a symmetrical branch side. The minimum outer diameter of the fastening core is smaller than the inner diameter of the hollow screw, allowing it to be placed inside the hollow screw. The energy-dissipating reinforcing bar is passed through the single branch of the Y-shaped structure of the fastening device. By tightening the locking nut, the fastening core gradually shrinks, thus securing the energy-dissipating reinforcing bar. In addition to securing the energy-dissipating reinforcing bar, the fastening device also secures the high-strength fiber rope. The specific operating steps are as follows: After extending and aligning the high-strength fiber rope that makes up the cable structure along the length of the steel pipe sleeve, the two free ends of the high-strength fiber rope are passed through the two symmetrical branches of the fastening device, sequentially through the locking nut, the fastening core, and the hollow screw. Then, the fastening core is inserted into the hollow screw, and the locking nut is rotated to secure the high-strength fiber rope.

[0007] The ultimate tensile breaking load of the energy-dissipating reinforcing bar in the energy-dissipating structure is less than the tensile load provided by the high-strength fiber rope, but its tensile breaking strain is greater than that of the high-strength fiber rope. Because the length of the energy-dissipating reinforcing bar is less than the length of the high-strength fiber rope fixing between the two fastening devices, the energy-dissipating reinforcing bar breaks when the external force acting on it exceeds its ultimate breaking load. Subsequently, the high-strength fiber rope begins to bear the load, during which the energy-dissipating reinforcing bar dissipates energy.

[0008] The aforementioned auxiliary structure includes an anchor cable tray and an anchoring lock, wherein the anchor cable tray is composed of a rubber pad layer with a honeycomb structure and a steel plate, and the anchoring lock is composed of a group of wedge-shaped steel plates.

[0009] Preferably, the high-strength fiber rope constituting the cable structure is a fiber bundle made of ultra-high molecular weight polyethylene fiber material, carbon fiber, glass fiber and basalt fiber wound together, with a uniaxial tensile strength of not less than 1000 MPa and a tensile breaking strain of not less than 2%.

[0010] Preferably, the high-strength fiber rope constituting the cable structure is a fiber rope with a length not less than 2.5 times the length of the steel pipe sleeve. The diameter of the fiber rope can be adjusted according to actual engineering needs to increase the expected tensile bearing capacity.

[0011] Preferably, the steel pipe sleeve constituting the cable structure is made of high-strength steel (strength not less than 500 MPa), the outer diameter of the steel pipe sleeve is not less than 20 mm, the thickness is not less than 3 mm, and the length is based on the actual designed anchor cable length.

[0012] Preferably, the diameter of the positioning bolt of the guide cone that makes up the steel pipe sleeve is not greater than the diameter of the guide hole of the steel pipe sleeve.

[0013] Preferably, the mining impact-resistant anchor cable with built-in high-strength fiber rope includes at least two energy-dissipating structures.

[0014] Preferably, the number of fastening devices constituting the energy-consuming structure is not less than four.

[0015] Preferably, the distance between the two fastening devices in a group is not less than 1000mm, and the length of the high-strength fiber rope that secures the two fastening devices is not less than 1000mm.

[0016] Preferably, the length of the energy-consuming steel bar that breaks under tension in the energy-consuming structure is not greater than the length of the high-strength fiber rope between the fastening devices, and the length fixed by the fastening core is not less than 100mm.

[0017] Preferably, the anchor cable tray has a circular cross-section and is composed of a honeycomb-structured rubber pad layer and two steel plates of identical shape.

[0018] The present invention also provides a construction method for a mining impact-resistant anchor cable with built-in high-strength fiber rope as described in any of the preceding claims, characterized by comprising the following steps:

[0019] S1: After passing the high-strength fiber rope through the U-shaped buckle of the guide cone, use buckle bolts to fix it;

[0020] S2: Straighten the high-strength fiber rope along the length of the steel pipe sleeve to ensure that the two free ends of the high-strength fiber rope passing through the U-shaped buckle are of the same length.

[0021] S3: The high-strength fiber rope is fixed by the fastening device in the energy-consuming structure. It passes through the locking nut, the fastening core and the hollow screw in sequence. After tightening the locking nut, the first fixed section of the high-strength fiber rope is formed.

[0022] S4: Repeat the above steps to complete the segmented fixing of the high-strength fiber rope;

[0023] S5: Separate the high-strength fiber ropes on both sides of the fastening device fixed in the energy-dissipating structure, and fix the energy-dissipating steel bars through the fastening clip core;

[0024] S6: Repeat the above steps to complete the installation of all energy-consuming steel bars;

[0025] S7: Place the guide cone of the high-strength fiber rope that has been fixed above into the steel pipe sleeve, so that the positioning bolt at one end of the guide cone passes through the guide hole left at the solid end of the steel pipe sleeve.

[0026] S8: Use a positioning nut to fix the positioning bolt that passes through the solid end of the steel pipe sleeve;

[0027] S9: Place the already connected cable structure and energy-dissipating structure into the drilled holes in the roadway roof and anchor them using resin anchoring agent.

[0028] S10: After the anchoring agent has cured, leave the free end of the high-strength fiber rope outside the steel pipe sleeve and pass it through the anchor cable tray. Use the anchoring lock to anchor and apply prestress.

[0029] Compared with the prior art, the advantages and positive effects of the present invention include the following aspects:

[0030] (1) High-strength fiber rope has the mechanical properties of being lightweight, high-strength and corrosion-resistant, which can realize the development of underground support structures toward high strength while minimizing the labor intensity of workers;

[0031] (2) The external steel pipe sleeve can protect the internal high-strength fiber rope, especially in resisting the shear force during the lateral deformation of the surrounding rock;

[0032] (3) The high-strength fiber rope is a whole rope structure. After passing through the U-shaped buckle of the guide cone, it forms an integral load-bearing structure, thus avoiding the occurrence of stress concentration.

[0033] (4) The energy-dissipating steel bars used in the energy-dissipating structure have a lower strength than the high-strength fiber rope, and play a role in consuming energy during the process of the energy-dissipating steel bars being pulled apart. After the energy-dissipating steel bars are pulled apart, the high-strength fiber rope begins to play a load-bearing role, which can realize the staged release of energy in the rockburst roadway;

[0034] (5) The anchor cable tray composed of a honeycomb structured rubber pad and steel plate can absorb the accumulated energy under impact load to the maximum extent and protect the entire support structure. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments are briefly described below. It should be noted that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other related drawings based on these drawings without any creative effort.

[0036] Figure 1 This is an overall schematic diagram of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the steel pipe sleeve of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the internal structure of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the guide cone structure of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the connection method between the guide cone and the steel pipe sleeve of the mining impact-resistant anchor cable with built-in high-strength fiber rope in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the fastening device structure of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention.

[0042] Figure 7 This is a partially enlarged view of the fastening core of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the auxiliary structure of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the wedge-shaped steel sheet of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention.

[0045] Reference numerals: 1-Cable structure; 11-Steel pipe sleeve; 111-Guide hole; 12-Guide cone; 121-Positioning bolt; 122-Positioning nut; 123-U-shaped buckle; 124-Buckling bolt; 13-High-strength fiber rope; 2-Energy dissipation structure; 21-Fastening device; 211-Hollow screw; 212-Positioning nut; 213-Fastening core; 22-Energy dissipation steel bar; 3-Auxiliary structure; 31-Anchor cable tray; 311-Rubber pad; 312-Steel plate; 32-Anchoring lock; 321-Wedge-shaped steel plate. Detailed Implementation

[0046] The structure of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to an embodiment of the present invention is described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

[0047] The purpose of this invention is to provide a mine-use impact-resistant anchor cable with built-in high-strength fiber rope to address the technical deficiencies of traditional anchor cable support structures in the support process of roadways prone to rockburst. By using lightweight, high-strength, and corrosion-resistant high-strength fiber rope, the requirements of rockburst roadways for high-strength support structures are met. The presence of an energy-dissipating structure effectively absorbs and releases the energy accumulated in the surrounding rock under impact loads. The anchor cable tray, composed of a honeycomb-structured rubber pad and steel plate, also effectively mitigates the impact of impact energy on the support structure.

[0048] To make the above-mentioned objects, features and advantages of the present invention clearer, further detailed description is provided below in conjunction with the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] This invention relates to a mining impact-resistant anchor cable with an embedded high-strength fiber rope, such as... Figure 1 As shown, it includes: cable structure 1, energy dissipation structure 2, and auxiliary structure 3.

[0051] like Figure 2-5 As shown, the cable structure 1 consists of a steel pipe sleeve 11, a guide cone 12, and a high-strength fiber rope 13. One end of the steel pipe sleeve 11 is hollow, and the other end is a solid structure 10 cm long. A guide hole 111 is provided at the solid end of the steel pipe sleeve 11, penetrating the solid structure. One end of the guide cone 12 has a positioning bolt 121, and the other end has a U-shaped buckle 123. The positioning bolt 121 of the guide cone 12 can extend through the guide hole 111 at one end of the steel pipe sleeve 12 to the outside of the steel pipe sleeve 11, and is secured using a positioning nut 122. The other end of the guide cone 12 has a U-shaped buckle 123, through which the high-strength fiber rope 13 passes and is secured using a buckle bolt 124.

[0052] like Figure 6-7As shown, a mining impact-resistant anchor cable with built-in high-strength fiber rope includes at least two energy-dissipating structures 2. Each energy-dissipating structure 2 consists of a fastening device 21 and an energy-dissipating reinforcing bar 22. The fastening device 21 is a Y-shaped structure, including a hollow screw 211, a locking nut 212, and a fastening core 213. The minimum outer diameter of the fastening core 213 is smaller than the inner diameter of the hollow screw 211. The energy-dissipating reinforcing bar 22 is passed through a single branch of the Y-shaped structure of the fastening device 21, and the fastening core 213 is gradually reduced by tightening the locking nut 212, thereby fixing the energy-dissipating reinforcing bar 22.

[0053] like Figure 6-7 As shown, the fastening device 21, in addition to fixing the energy-dissipating steel bar 22, is also used to fix the high-strength fiber rope 13. The specific operation steps are as follows: After extending and aligning the high-strength fiber rope 13, which constitutes the cable structure 1, along the length direction of the steel pipe sleeve 11, the two free ends of the high-strength fiber rope 13 are respectively passed through the two symmetrical branches of the fastening device 21, and then sequentially through the locking nut 212, the fastening core 213, and the hollow screw 211. After inserting the fastening core 213 into the hollow screw 211, the locking nut 212 is rotated to achieve segmented fixing of the high-strength fiber rope 13. Each mining impact-resistant anchor cable with built-in high-strength fiber rope includes at least two energy-dissipating structures 2. Since the ultimate tensile breaking load of the energy-dissipating steel bar 22 in the energy-dissipating structure 2 is less than the tensile load provided by the high-strength fiber rope 13, but its tensile breaking strain is greater than that of the high-strength fiber rope 13. Because the length of the energy-dissipating reinforcing bar 22 is less than the length of the high-strength fiber rope 13 fixed between the two fastening devices 21, the energy-dissipating reinforcing bar 22 breaks when the external force acting on it exceeds its ultimate breaking load. Subsequently, the high-strength fiber rope 13 begins to bear the load, during which the energy-dissipating reinforcing bar 22 plays a role in dissipating energy.

[0054] like Figure 8-9 As shown, the auxiliary structure 3 includes an anchor cable tray 31 and an anchoring lock 32. The anchor cable tray 31 is composed of a rubber pad layer 311 with a honeycomb structure and two steel plates 312 with identical shapes; the anchoring lock 32 is composed of a group of wedge-shaped steel plates 321.

[0055] Example 2

[0056] The present invention also provides a construction method for a mining impact-resistant anchor cable with an embedded high-strength fiber rope as described in Embodiment 1 above, characterized by comprising the following steps:

[0057] Step 1: After passing the high-strength fiber rope 13 through the U-shaped buckle 123 of the guide cone 12, fix it with the buckle bolt 124;

[0058] Step 2: Straighten the high-strength fiber rope 13 along the length of the steel pipe sleeve 11, ensuring that the two free ends of the high-strength fiber rope 13 passing through the U-shaped buckle 123 are of the same length;

[0059] Step 3: Fix the high-strength fiber rope 13 through the fastening device 21 in the energy dissipation structure 2, and pass it through the locking nut 212, the fastening core 213 and the hollow screw 211 in sequence. After tightening the locking nut 212, the first fixed section of the high-strength fiber rope 13 is formed.

[0060] Step 4: Repeat the above steps to complete the segmented fixing of the high-strength fiber rope 13;

[0061] Step 5: Separate the high-strength fiber ropes 13 fixed on both sides of the fastening device 21 in the energy dissipation structure 2, and fix the energy dissipation steel bar 22 through the fastening core 213;

[0062] Step 6: Repeat the above steps to complete the installation of all energy-consuming steel bars 22;

[0063] Step 7: Place the guide cone 12 of the high-strength fiber rope 13 that has been fixed above into the steel pipe sleeve 11, so that the positioning bolt 121 at one end of the guide cone 12 passes through the guide hole 111 left at the solid end of the steel pipe sleeve 11.

[0064] Step 8: Use the positioning nut 122 to fix the positioning bolt 121 that passes through the solid end of the steel pipe sleeve 11;

[0065] Step 9: Place the already connected cable structure 1 and energy dissipation structure 2 into the drilled holes in the tunnel roof and anchor them using resin anchoring agent.

[0066] Step 10: After the anchoring agent has cured, the free end of the high-strength fiber rope 13 left outside the steel pipe sleeve 11 is passed through the anchor cable tray 31, and anchored and prestressed using the anchoring lock 32.

[0067] Although embodiments of the present invention have been given and described, it is understood that the above embodiments are exemplary. For those skilled in the art, any changes, modifications, substitutions, and variations made to the embodiments of the present invention within the principles and spirit of the present invention should be included within the scope of protection of the present invention. In summary, the content described in this specification should not be construed as limiting the present invention to anchoring and applying prestress.

Claims

1. A construction method for a mining impact-resistant anchor cable with an embedded high-strength fiber rope, the mining impact-resistant anchor cable comprising: The cable structure comprises a steel pipe sleeve, a guide cone, and a high-strength fiber rope; the high-strength fiber rope is a fiber bundle made of ultra-high molecular weight polyethylene fiber, carbon fiber, glass fiber, and basalt fiber wound together; at least two energy-dissipating structures, each consisting of a fastening device and energy-dissipating reinforcing bars; and an auxiliary structure comprising an anchor cable tray and an anchoring lock; the fastening device is a Y-shaped structure consisting of a hollow screw, a locking nut, and a fastening core, wherein the minimum outer diameter of the fastening core is smaller than the inner diameter of the hollow screw; the construction method includes the following steps: Step 1: After passing the high-strength fiber rope through the U-shaped buckle of the guide cone, secure it with buckle bolts; Step 2: Straighten the high-strength fiber rope along the length of the steel pipe sleeve, ensuring that the two free ends of the high-strength fiber rope passing through the U-shaped buckle are of the same length; Step 3: Fix the high-strength fiber rope through the fastening device in the energy-dissipating structure, passing it through the locking nut, fastening core and hollow screw in sequence, and tightening the locking nut to form the first fixed section of the high-strength fiber rope; Step 4: Repeat the above steps to complete the segmented fixing of the high-strength fiber rope; Step 5: Separate the high-strength fiber ropes on both sides of the fastening device fixed in the energy-dissipating structure, and fix the energy-dissipating steel bar with the fastening clip core; Step 6: Repeat the above steps to complete the installation of all energy-consuming steel bars; Step 7: Place the guide cone of the high-strength fiber rope that has been fixed above into the steel pipe sleeve, so that the positioning bolt at one end of the guide cone passes through the guide hole left at the solid end of the steel pipe sleeve. Step 8: Secure the positioning bolt that passes through the solid end of the steel pipe sleeve using a positioning nut; Step 9: Place the already connected cable structure and energy dissipation structure into the drilled holes in the tunnel roof and anchor them using resin anchoring agent. Step 10: After the anchoring agent has cured, leave the free end of the high-strength fiber rope outside the steel pipe sleeve and pass it through the anchor cable tray. Use the anchoring lock to anchor and apply prestress.

2. The construction method of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to claim 1, characterized in that: The guide cone has a positioning bolt at one end and a U-shaped buckle at the other end.

3. The construction method of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to claim 1, characterized in that: The ultimate tensile breaking load of the energy-consuming steel bar is less than the tensile load provided by the high-strength fiber rope, and the length at which it breaks tensilely is not greater than the length of the high-strength fiber rope between the fastening devices.

4. The construction method of the mining impact-resistant anchor cable with built-in high-strength fiber rope according to claim 1, characterized in that: The anchor cable tray is composed of a rubber pad layer with a honeycomb structure and two steel plates of identical shape.

Images