High-constant-resistance energy-absorbing grouting anchor rod
Through the design of high constant resistance energy-absorbing grouting anchors, the ribbed hollow anchor rod and bearing bead frame structure are used to achieve high bearing capacity and adhesion, which solves the failure problem of traditional grouting anchor rods in high stress areas, provides continuous support and crack repair, and improves the stability and safety of the slope.
Patent Information
- Application Number
- CN202510914309.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-08-12
AI Technical Summary
Traditional grouting anchor rods are prone to shear slipping of anchor interfaces or rod body breaking in high ground stress areas, which cannot adapt to dynamic stress fluctuations, and fail under the action of rock bursts and other dynamics, which cannot meet the ductile support needs in high stress areas, and the penetration and reinforcement effect on cracked rock mass is limited.
High constant resistance energy-absorbing grouting anchor rods are adopted, including ribbed hollow anchor rods, bearing bead frames and column tube structures. They buffer energy absorption through ball cutting, provide high bearing capacity and bonding force, and achieve graded buffering with inverted triangle structure, absorb and transfer the deformation energy of surrounding rocks, and grouting and repairing the cracked surrounding rocks.
Provide continuous constant resistance in high-stress areas, effectively control surrounding rock deformation, enhance support efficiency, reduce failure risk, and improve slope stability and safety.
Smart Images
Figure CN120465992A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of grouting anchor rods, in particular to a high-constant-resistance energy-absorbing grouting anchor rod suitable for high-stress rock masses. Background Art
[0002] Slope stability issues are currently a frequent concern in highway, railway, water conservancy, and mountainous urban construction projects. In open-pit mines, hydropower projects, and transportation infrastructure, stability control of high and steep rock slopes is a core challenge for engineering safety. As resource development progresses deeper, open-pit slopes increasingly face the combined effects of high geostress, frequent dynamic disturbances (such as blasting vibrations and rockbursts), and complex hydrogeological conditions.
[0003] While traditional grouting anchors can provide a certain level of support, they are prone to shear slippage at the anchoring interface or rod breakage in high-stress areas. This is especially true when the rock mass is subjected to excavation unloading or blasting vibrations. The anchors are unable to adapt to dynamic stress fluctuations, resulting in accelerated prestress loss and a sharp drop in support efficiency. In the face of these engineering disasters, conventional anchors primarily rely on rigid support and lack the ability to dissipate impact loads. Furthermore, when open-pit slopes are subjected to dynamic forces such as blasting vibrations and energy release from rock fractures, the anchor system is prone to instantaneous overload failure, making it unable to meet the ductile support requirements under "strong disturbance-large deformation" conditions. Furthermore, existing grouting processes have limited effectiveness in penetrating and reinforcing fractured rock masses. The bond strength between the grouting body and the high-stress rock mass rapidly decays with repeated loading, making it difficult to form a stable energy transfer path. Therefore, developing a grouting anchor with high constant resistance, energy absorption and buffering capabilities, and long-term anchoring capacity has become an urgent need in the field of open-pit slope support. Summary of the Invention
[0004] In response to the above-mentioned technical deficiencies, the purpose of the present invention is to provide a high constant resistance energy-absorbing grouting anchor rod, which has high bearing capacity, high bonding strength, and a large deformation capacity to absorb and transfer the energy generated by the deformation of the surrounding rock. At the same time, it can also perform grouting repairs on cracked surrounding rocks and control the deformation of the surrounding rock.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A high constant resistance energy absorption grouting anchor rod, comprising a grouting anchor rod assembly and a high constant resistance energy absorption assembly; the grouting anchor rod assembly comprises a drill bit, a ribbed hollow anchor rod, a grouting plug, a pad, a butterfly tray and a pre-tightening nut, the ribbed hollow anchor rod comprises a head threaded hollow anchor rod, a middle ribbed hollow anchor rod and a bottom threaded hollow anchor rod; the head threaded hollow anchor rod is connected to the drill bit, the middle ribbed hollow anchor rod is sequentially installed with a grouting plug, a pad, a high constant resistance energy absorption assembly, another A pad and a butterfly tray, a pre-tightening nut is provided at the bottom end of the butterfly tray, and the pre-tightening nut is connected to the bottom threaded hollow anchor rod; the high constant resistance energy absorption component includes a bearing bead rack and a column barrel, the bearing bead rack and the column barrel are both sleeved on the outside of the middle ribbed hollow anchor rod, the bearing bead rack includes a retaining frame and a number of balls, and the several balls are connected together through the retaining frame; the inner surface of the upper part of the column barrel is an inverted triangular slope, and the balls are initially located between the outer wall of the ribbed hollow anchor rod and the inner wall of the column barrel slope.
[0006] Furthermore, the head threaded hollow anchor rod and the bottom threaded hollow anchor rod are both processed with threads, a high constant resistance energy absorption component installation area with a smooth surface is reserved on the middle ribbed hollow anchor rod, and the remaining area is processed into a ribbed shape, and a grouting channel is provided inside the ribbed hollow anchor rod.
[0007] Furthermore, the drill bit is a hollow structure, and the drill bit is threadedly connected to the hollow anchor rod through a sleeve and a head thread; the slurry outlet of the drill bit is arranged below the left and right sides of the drill bit.
[0008] Furthermore, the ball radius D is determined by the inclined height a of the inner surface of the cylinder, the inner diameter s of the cylinder and the diameter d of the anchor rod, which satisfies the following formula: .
[0009] The beneficial effects of the present invention are: The present invention provides high tensile resistance and continuously provides constant resistance in the face of low stress support environment through the coordinated arrangement of ribbed hollow anchor rods, bearing bead racks, column tubes and the inverted triangle structure on the inner surface of the column tubes. When facing strong or intense impacts, the column tubes and anchor rods are cut by balls, and with the cooperation of the inverted triangle structure, graded buffering and energy absorption are achieved, which can effectively control the deformation of the tunnel surrounding rock.
[0010] The slurry outlets of the present invention are arranged below the left and right sides of the drill bit, which can effectively prevent gravel from entering the rod body and effectively control the deformation of the tunnel surrounding rock through the grouting sealing + absorption and yield support method. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0012] Figure 1 A schematic structural diagram of a high constant resistance energy absorbing grouting anchor provided by the present invention; Figure 2 A schematic structural diagram of a ribbed hollow anchor rod is provided for an embodiment of the present invention; Figure 3 A schematic structural diagram of a drill bit provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of a high constant resistance energy absorbing component provided in an embodiment of the present invention.
[0013] Description of reference numerals: 1-drill bit, 2-slurry outlet, 3-ribbed hollow anchor, 4-grouting channel, 5-slurry stopper, 6-pad, 7-column, 8-bearing bead holder, 9-butterfly tray, 10-pre-tightening nut, 11-bottom threaded hollow anchor, 12-high constant resistance energy absorption component installation area, 13-head threaded hollow anchor, 14-middle ribbed hollow anchor, 15-sleeve, 16-column inner surface inclined height a, 17-anchor outer diameter d, 18-column inner diameter s, 19-ball, 20-cage. DETAILED DESCRIPTION
[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example
[0015] like Figure 1-Figure 4As shown, a high constant resistance energy absorption grouting anchor comprises a grouting anchor assembly and a high constant resistance energy absorption assembly. The grouting anchor assembly comprises a drill bit 1, a ribbed hollow anchor 3, a grouting plug 5, a pad 6, a butterfly tray 7 and a pre-tightening nut 10. The ribbed hollow anchor comprises a head threaded hollow anchor 13, a middle ribbed hollow anchor 14 and a bottom threaded hollow anchor 11. The head threaded hollow anchor 13 is threadedly connected to the drill bit 1 through a sleeve 15. The middle ribbed hollow anchor 14 is connected to the grouting plug 5, a pad 6 from top to bottom. , a high constant resistance energy absorption component, another pad 6 and a butterfly tray 9 are connected; a pre-tightening nut 10 is provided at the bottom end of the butterfly tray, and the pre-tightening nut 10 is connected to the bottom threaded hollow anchor rod 11; the high constant resistance energy absorption component includes a bearing bead rack 8 and a column tube 7, and the bearing bead rack 8 and the column tube 7 are both sleeved on the outside of the middle ribbed hollow anchor rod 14, and the bearing bead rack 8 includes a retaining frame 20 and a ball 19, and several balls 19 are connected together through the retaining frame 20; the ball 19 is located between the outer wall of the middle ribbed hollow anchor rod 14 and the inner wall of the column tube 7.
[0016] Optionally, the head and bottom of the ribbed hollow anchor rod 3 are processed into a threaded shape, and the thread direction is left-handed; a 35 cm smooth area is reserved in the middle of the ribbed hollow anchor rod 3 for installing the slurry stopper 5, the pad 6, the high constant resistance energy absorption component and the butterfly tray 9; the remaining area is processed into a ribbed shape, and a grouting channel 4 with a diameter of 15 mm is reserved inside the ribbed hollow anchor rod 3.
[0017] Optionally, the drill bit 1 adopts a hollow structure and is connected to the ribbed hollow anchor rod 3 using a threaded connection method. The slurry outlet 2 of the drill bit 1 is arranged below the left and right sides of the drill bit 1, and the diameter of the slurry outlet 2 is 3 mm.
[0018] Optionally, the height of the high constant resistance energy absorbing component is 20 cm, the inner surface of the upper part of the column 7 is an inverted triangular slope, and the ball 19 is initially located between the outer wall of the ribbed hollow anchor rod 3 and the inner wall of the slope of the column 7.
[0019] Optionally, the ball radius D is determined by the height a (16) of the inner surface of the cylinder, the inner diameter s (18) of the cylinder, and the diameter d (17) of the anchor rod, and satisfies the following formula: ; Where: s is the inner diameter of the cylinder 18, d is the diameter of the anchor rod 17, and a is the height of the inclined surface of the inner surface of the cylinder 16.
[0020] The specific implementation process is as follows: in a high-stress deformation tunnel deep underground in a coal mine, a hole is drilled according to a predetermined position and hole depth; the drill bit 1 is installed on the threaded hollow anchor rod 13 at the head, inserted into the drill hole, and the anchor rod is sent to the predetermined position; the slurry stopper 5, the pad 6, the bearing bead holder 8, the column 7, the pad 6, the butterfly tray 9 are installed in sequence, and the warning nut 10 is tightened at the threaded end of the anchor rod; if the anchor rod needs to be prestressed, a tensioning pre-tightening machine is used to achieve a high pre-tightening of the anchor rod in a tensioned state, and the butterfly tray 9 is in a top pressure state at the inner edge of the surrounding rock tunnel; after completing the above steps, a grouting pump is used to inject slurry from the grouting port at the bottom of the anchor rod, and the slurry reaches the bottom of the anchor rod through the grouting channel 4, gradually filling the borehole and the rock wall gaps, completing the process. Grouting work; after the slurry solidifies, when the impact ground pressure tunnel deep underground in the coal mine releases strong or intense impact elastic energy, when the tunnel surrounding rock is deformed, the anchor rod and the pad 6 are instantly tensioned. In order to prevent the anchor rod and the tray from failing and being scrapped due to simply resisting the strong dynamic pressure, partial absorption and pressure relief are required. At this time, the anchor rod is stretched axially, causing the ball 19 in the high constant resistance energy absorption component to cut the column 7 and the anchor rod. The ball 19 is gradually embedded in the column 7 as the anchor rod is stretched. As the embedding depth of the ball 19 increases, the support resistance provided by the anchor rod steadily increases, thereby achieving the purpose of absorbing pressure relief and providing high constant resistance.
[0021] The present invention provides high tensile resistance and continuously provides constant resistance when facing a low stress support environment through the coordinated arrangement of the ribbed hollow anchor rod 4, the bearing bead rack 8, the column tube 7 and the inverted triangle structure on the inner surface of the column tube 7. When facing a strong impact or an intense impact, the column tube 7 and the anchor rod are cut by the ball 19, and with the cooperation of the inverted triangle structure, graded buffering and energy absorption are achieved, which can effectively control the deformation of the tunnel surrounding rock, enhance the impact resistance and safety of the tunnel, and reduce the tunnel repair cost and the catastrophic impact of impact ground pressure.
[0022] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.
Claims
1. A high constant resistance energy absorbing grouting anchor, characterized in that: It includes a grouting anchor assembly and a high constant resistance energy absorption assembly; the grouting anchor assembly includes a drill bit, a ribbed hollow anchor, a grouting plug, a pad, a butterfly tray and a pre-tightening nut, the ribbed hollow anchor includes a head threaded hollow anchor, a middle ribbed hollow anchor and a bottom threaded hollow anchor; the head threaded hollow anchor is connected to the drill bit, and the middle ribbed hollow anchor is sequentially installed with a grouting plug, a pad, a high constant resistance energy absorption assembly, another pad and a butterfly tray from top to bottom. The butterfly tray is provided with a pre-tightening nut at the bottom end, and the pre-tightening nut is connected to the bottom threaded hollow anchor rod; the high constant resistance energy absorption component includes a bearing bead rack and a column barrel, and the bearing bead rack and the column barrel are both sleeved on the outside of the middle ribbed hollow anchor rod, and the bearing bead rack includes a retaining frame and a number of balls, and the several balls are connected together through the retaining frame; the inner surface of the upper part of the column barrel is an inverted triangular slope, and the balls are initially located between the outer wall of the ribbed hollow anchor rod and the inner wall of the column barrel slope.
2. A high constant resistance energy absorbing grouting anchor according to claim 1, characterized in that: The head threaded hollow anchor rod and the bottom threaded hollow anchor rod are both processed with threads. A high constant resistance energy absorption component installation area with a smooth surface is reserved on the middle ribbed hollow anchor rod, and the remaining area is processed into a ribbed shape. A grouting channel is set inside the ribbed hollow anchor rod.
3. The high constant resistance energy absorbing grouting anchor according to claim 1, characterized in that: The drill bit is a hollow structure, and the drill bit is threadedly connected to the hollow anchor rod with a sleeve and a head thread; the slurry outlets of the drill bit are arranged below the left and right sides of the drill bit.
4. The high constant resistance energy absorbing grouting anchor according to claim 1, characterized in that: The ball radius D is determined by the height a of the inclined surface of the inner surface of the cylinder, the inner diameter s of the cylinder and the diameter d of the anchor rod, and satisfies the following formula: 。