Anchor cable, anchor cable device, anchor cable manufacturing method and grouting construction method

Abstract

The present invention relates to the field of civil engineering, and specifically to an anchor cable, an anchor cable device, an anchor cable manufacturing method and a grouting construction method. The anchor cable includes a hole-blocking grouting pipe, a primary grouting pipe, a secondary high-pressure grouting pipe, an exhaust pipe, an isolation frame, a guide cap and at least two strands; the length of the primary grouting pipe is greater than the length of the hole-blocking grouting pipe; the length of the exhaust pipe is greater than the length of the primary grouting pipe; the length of the secondary high-pressure grouting pipe is greater than the length of the exhaust pipe; the isolation frame is provided with a strand hole for the strand to pass through, a plugging grouting hole for the hole-blocking grouting pipe to pass through, a primary grouting hole for the primary grouting pipe to pass through, a secondary high-pressure grouting hole for the secondary high-pressure grouting pipe to pass through, and an exhaust hole for the exhaust pipe to pass through; the guide cap is arranged at the end of the strand and connected to at least two strands. The anchor cable provided by the present invention has a large tensile strength, can be used to anchor giant rock masses, and can be used to reinforce unstable rock masses on the arch of a large cave or the top of a large karst cave.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, and in particular to a vertical upward anchor cable in a tunnel or a large empty cave, an anchor cable device, an anchor cable manufacturing method and a grouting construction method. Background Art

[0002] Since the beginning of the 21st century, with the rapid development of my country's railway construction, more and more high-standard double-track railways with speeds of more than 200 km / h have been built. Especially in the mountainous areas of central and western China, the line selection is restricted by factors such as large curve radius and complex terrain and geological conditions. The scale of tunnels has increased rapidly, and more and more tunnels pass through karst. Since the karst cave wall is generally stable, there are unstable block falls in some parts. Therefore, how to deal with the risk of unstable block falls in karst areas is of great significance to ensure the safe construction and normal operation of tunnels.

[0003] At present, the main methods for dealing with falling blocks in the arch of railway and highway tunnels are: sprayed concrete support, anchor cable or anchor rod reinforcement, etc. Sprayed concrete support has a significant reinforcement effect on the surface surrounding rock, while the depth and anchoring force provided by traditional anchor cables or anchor rods are limited. If the above support methods are used to reinforce the surrounding rock of unstable rock blocks with a height of 15m in the arch, there will be great safety hazards during the construction and operation of the tunnel. Summary of the invention

[0004] The purpose of the present invention is to provide an anchor cable, an anchor cable device and a manufacturing method thereof and a grouting construction method to address the problems of low surrounding rock reinforcement depth and anchoring force of anchor cables or anchor rods in the prior art, so as to provide a long anchor cable construction method with convenient construction and controllable quality. The method has important engineering significance and practical value for reinforcing giant unstable blocks in karst caves, improving rock strata anchoring effects and solving vertical long anchor cable grouting problems.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides an anchor cable, comprising a hole-blocking grouting pipe, a primary grouting pipe, a secondary high-pressure grouting pipe, an exhaust pipe, an isolation frame, a guide cap, and at least two strands;

[0007] The length of the primary grouting pipe is greater than the length of the orifice plugging grouting pipe; the length of the exhaust pipe is greater than the length of the primary grouting pipe; the length of the secondary high-pressure grouting pipe is greater than the length of the exhaust pipe;

[0008] The isolation frame is provided with a strand hole for the strand to pass through, a plugging grouting hole for the hole plugging grouting pipe to pass through, a primary grouting hole for the primary grouting pipe to pass through, a secondary high-pressure grouting hole for the secondary high-pressure grouting pipe to pass through, and an exhaust hole for the exhaust pipe to pass through;

[0009] The guide cap is arranged at the end of the stranded wire and is connected to the at least two stranded wires.

[0010] When the anchor cable provided by the present invention is used, a grout stopper is first installed at the anchor hole, and then the hole is sealed by grouting through a grouting pipe, and then two groutings are respectively performed through a primary grouting pipe and a secondary high-pressure grouting pipe, which effectively solves the problems of difficult grouting of traditional vertical anchor cables, poor grouting effect and incomplete grouting, improves the density of the slurry and the bonding strength with the rock and soil, and greatly improves the anchoring force. At least two steel strands are provided, and the tensile strength is greater, which can play a better role in reinforcing the unstable rock mass on the top wall of a large cave, and overcomes the defects of small reinforcement depth and weak tensile strength of traditional anchor rods.

[0011] The term "the guide cap is arranged at the end of the stranded wire and connected to the at least two stranded wires" means that one end of all the stranded wires is connected to the guide cap.

[0012] As a preferred solution of the present invention, at least two spacer frames are arranged at intervals along the length direction of the anchor cable.

[0013] As a preferred solution of the present invention, it also includes a centering bracket, which is sleeved outside the isolation frame and connected to the isolation frame. By providing the centering bracket, the anchor cable can be centered in the drill hole.

[0014] As a preferred solution of the present invention, a tightening ring is provided between two adjacent isolation frames, and the tightening ring is used to tighten the stranded wire. By providing the tightening ring, the anchor cable as a whole presents a jujube-shaped shape, and after grouting, the anchoring tension that the anchor cable can provide can be significantly increased.

[0015] In a second aspect, the present invention provides an anchor cable device, comprising a grout stopper, an anchor pier, an anchor and the above-mentioned anchor cable;

[0016] The anchor pier is arranged on the rock wall at the anchor hole, and the anchor pier comprises a pad assembly, and a central hole for the anchor cable to pass through is provided in the middle of the pad assembly;

[0017] The grout stopper is arranged at the anchor hole and abuts against the anchor pier;

[0018] The anchor is arranged outside the anchor pier and abuts against the anchor pier.

[0019] As a preferred embodiment of the present invention, the pad assembly includes pad one and pad two, pad one is anchored on the rock wall, pad one and pad two are overlapped and fixedly connected, and the size of pad one is larger than the size of pad two.

[0020] Through the above structure, on the one hand, the size of the pad one is larger than that of the pad two, so as to expand the force-bearing area, reduce the force on the rock wall per unit area, and avoid local rock compression and damage; on the other hand, by setting two pads, the overall thickness of the pad can be increased, avoiding shear damage caused by insufficient pad thickness when prestress is applied to the anchor cable.

[0021] As a preferred embodiment of the present invention, it also includes a leveling layer, a protective net and a steel fiber sprayed concrete layer;

[0022] The protection net is wrapped on the anchor pier, and the outside of the protection net is covered and closed by the steel fiber sprayed concrete layer; the leveling layer is arranged in the steel fiber sprayed concrete layer, and the surface of the leveling layer is flush with the surface of the rock wall.

[0023] Through the above structure, on the one hand, since the original cave rock wall cannot be smooth, a leveling layer is set to ensure that the pad can be closely attached to the rock wall surface, so as to ensure that the pad bears surface load rather than point load when the anchor cable prestress is applied; on the other hand, a steel fiber sprayed concrete layer is set to seal the anchor head to strengthen the safety protection of the anchor head.

[0024] In a third aspect, the present invention provides a method for manufacturing an anchor cable, comprising the following steps:

[0025] S1. Prepare the steel strands, set an isolation frame at a preset distance, and make the isolation frame pass through the hole-blocking grouting pipe, the primary grouting pipe, the secondary high-pressure grouting pipe and the exhaust pipe, and seal the hole-blocking grouting pipe, the primary grouting pipe, the secondary high-pressure grouting pipe and the exhaust pipe with glass glue;

[0026] S2. Install the guide cap at the end of the anchor cable.

[0027] As a preferred solution of the present invention, after the step S1 is completed, the following steps are also included:

[0028] S11. A centering bracket is set on the outer side of a part of the isolation frame, so that the centering bracket is fixedly connected to the isolation frame;

[0029] S12. Install a clamp ring between two adjacent isolation frames.

[0030] In a fourth aspect, the present invention provides a grouting construction method, comprising the following steps:

[0031] A1. Drilling;

[0032] A2. Place the anchor cable into the drill hole, push it upwards and fix it temporarily;

[0033] A3. Install grout stopper at the anchor hole;

[0034] A4. Chisel away a certain depth of rock wall at the anchor hole mouth and apply a leveling layer;

[0035] A5. Install and fix the anchor pier;

[0036] A6. Orifice plugging grouting: grouting is carried out into the borehole through the orifice plugging grouting pipe. The grouting height exceeds the orifice plugging grouting pipe. If there is slurry backflowing from the plugging grouting pipe, grouting is stopped to ensure the borehole is sealed;

[0037] A7. After the hole plugging grouting is finally set, grouting is carried out in the borehole through the primary grouting pipe until the exhaust pipe returns to the grouting;

[0038] A8. Before the slurry initially sets, secondary high-pressure grouting is performed in the borehole through the secondary high-pressure grouting pipe;

[0039] A9. After the slurry has finally set and the strength reaches the designed strength, install the anchor, tension and lock it;

[0040] A10. Set up a protective net outside the anchor and then cover and seal it with sprayed steel fiber concrete.

[0041] The present invention can realize the vertical long anchor cable grouting construction through the above-mentioned drilling grouting construction method.

[0042] The anchoring structure has greater tensile strength, so it can reinforce the unstable rock mass at the top of large empty caves, overcoming the defects of traditional anchor reinforcement with small depth and weak tensile strength.

[0043] In traditional anchor cable grouting, a stopper is usually set at the anchor hole, and then grouting is directly performed. However, the anchor cable of the present invention is vertically upward, and for long anchor cables, if the traditional method is used, the stopper will be flushed out under the action of grouting pressure. Therefore, the present invention first grouts the hole section, uses the hole grouting plugging section as the stopper section, and then grouts the anchor cable.

[0044] Traditional anchor cables are only equipped with one grouting pipe, while the anchor cable of the present invention is vertically upward. If only one grouting pipe is provided, after the first grouting and the initial setting of the slurry, the second grouting cannot be performed; in addition, the anchor cable of the present invention is mainly aimed at long and large anchor cables, and the grouting section is long. After the first grouting, the slurry solidifies and shrinks, resulting in the top of the anchor cable being loose or having voids, which affects the stress of the anchor cable. Therefore, the anchor cable of the present invention is equipped with two grouting pipes, the length of the first grouting pipe is greater than the length of the orifice plugging grouting pipe; the length of the exhaust pipe is greater than the length of the first grouting pipe; the length of the secondary high-pressure grouting pipe is greater than the length of the exhaust pipe; after the initial setting of the first grouting, the secondary high-pressure grouting pipe is used for high-pressure grouting, which effectively solves the problems of difficult grouting of long and large vertical anchor cables, loose grouting, and poor effect, and improves the bonding strength between the slurry and the rock and soil body, thereby improving the anchoring force. In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are:

[0045] The present invention provides an anchor cable with greater tensile strength, thereby realizing an anchoring structure with greater tensile strength, which can reinforce giant unstable arch rock masses and overcome the defects of small reinforcement depth and weak tensile strength of traditional anchor rods.

[0046] The grouting construction method provided by the present invention can be implemented based on the above-mentioned anchor cables. It adopts a construction method of hole plugging and secondary grouting. Through the method of primary pressure grouting, secondary high-pressure grouting and exhaust pipe exhaust and slurry return, it effectively solves the problems of difficult traditional vertical grouting and poor grouting effect, improves the density of the slurry and the bonding strength with the rock and soil, and greatly improves the anchoring force. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic structural diagram of an anchor cable device in a specific embodiment of the present invention.

[0048] Figure 2 is along Figure 1 Cross-sectional view of section AA.

[0049] Figure 3 It is a schematic structural diagram of an isolation frame in a specific implementation manner of the present invention.

[0050] Figure 4 It is a schematic diagram of the distance between the end of each grouting pipe in the anchor cable and the bottom of the hole in a specific embodiment of the present invention.

[0051] Figure 5 yes Figure 1 A partial enlarged view of part B in the middle.

[0052] Figure 6 yes Figure 1 A partial enlarged view of part C in the middle.

[0053] Figure 7 It is a schematic structural diagram of a pad assembly in a specific embodiment of the present invention.

[0054] Icons: 1-anchor cable; 2-anchor hole; 3-isolation frame; 4-centering bracket; 5-tightening ring; 6-guide cap; 7-exhaust pipe; 7a-exhaust hole; 8-hole plugging grouting pipe; 8a-hole plugging grouting hole; 9-primary grouting pipe; 9a-primary grouting hole; 10-secondary high-pressure grouting pipe; 10a-secondary high-pressure grouting hole; 11-pad one; 12-pad two; 13-anchor; 14-bolt rod; 15-washer; 16-nut; 17-protective net; 18-protective net anchor hole; 19-bolt hole; 20-steel fiber sprayed concrete; 21-corner weld; 22-stranded wire; 22a-stranded wire hole. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] Example 1

[0058] See also Figure 1-Figure 7 The embodiment of the present invention provides an anchor cable 1, which includes a hole plugging grouting pipe 8, a primary grouting pipe 9, a secondary high-pressure grouting pipe 10, an exhaust pipe 7, an isolation frame 3, a guide cap 6 and at least two strands 22. In this embodiment, the number of the strands 22 is nine.

[0059] The length of the secondary high-pressure grouting pipe 10 is greater than the length of the exhaust pipe 7, the length of the exhaust pipe 7 is greater than the length of the primary grouting pipe 9, and the length of the primary grouting pipe 9 is greater than the length of the orifice plugging grouting pipe 8. Through the above structure, when the anchor cable 1 is placed in the anchor hole 2, the distance between the secondary high-pressure grouting pipe 10 and the bottom of the hole is less than the distance between the exhaust pipe 7 and the bottom of the hole, the distance between the exhaust pipe 7 and the bottom of the hole is less than the distance between the primary grouting pipe 9 and the bottom of the hole, and the distance between the orifice plugging grouting pipe 8 and the bottom of the hole is greater than the distance between the primary grouting pipe 9 and the bottom of the hole.

[0060] The isolation frame 3 is provided with a stranded wire hole 22a for the stranded wire 22 to pass through, a hole plugging grouting hole 8a for the hole plugging grouting pipe 8 to pass through, a primary grouting hole 9a for the primary grouting pipe 9 to pass through, a secondary high-pressure grouting hole 10a for the secondary high-pressure grouting pipe 10 to pass through, and an exhaust hole 7a for the exhaust pipe 7 to pass through.

[0061] Specifically, the number of the stranded wire holes 22 a is equal to the number of the stranded wires 22 . In this embodiment, nine stranded wire holes 22 a are provided, eight of which are evenly distributed on the isolation frame 3 , and the other is provided at the center of the isolation frame 3 .

[0062] The hole-sealing grouting hole 8a, the primary grouting hole 9a, the secondary high-pressure grouting hole 10a, and the exhaust hole 7a are arranged in the area surrounded by the eight stranded wire holes 22a.

[0063] The guide cap 6 is disposed at the end of the stranded wire 22 and connected to the nine stranded wires 22 , thereby connecting the ends of the nine stranded wires 22 together.

[0064] At least two spacer frames 3 are arranged at intervals along the length direction of the anchor cable 1. Specifically, in this embodiment, one spacer frame 3 is arranged every 1 meter.

[0065] A centering bracket 4 is also sleeved on some of the isolation frames 3, and the centering bracket 4 is fixedly connected to the isolation frames 3. Specifically, in this embodiment, one centering bracket 4 is provided for every three isolation frames 3, that is, one centering bracket 4 is provided every 4 meters.

[0066] A tightening ring 5 is also provided on the anchor cable 1 between two adjacent spacer frames 3. The tightening ring 5 is used to tighten the stranded wire 22 between the two adjacent spacer frames 3, so that the anchor cable 1 presents a jujube-shaped structure.

[0067] The working principle of the anchor cable 1 provided in the embodiment of the present invention is:

[0068] When in use, place the anchor cable 1 in the anchor hole 2, first install a grouting plug at the mouth of the anchor hole 2, then grouting is performed through the grouting hole 8a to seal the hole mouth, and then a pressure grouting is performed through the primary grouting hole 9a. Before the initial setting of the primary grouting liquid, a secondary high-pressure grouting is performed through the secondary high-pressure grouting hole 10a to make the slurry in the anchor hole 2 full and dense.

[0069] The beneficial effects of the anchor cable 1 provided by the embodiment of the present invention are:

[0070] It has greater tensile strength and plays a better role in reinforcing unstable rock masses on the top walls of large caves, overcoming the defects of traditional anchor reinforcement, such as small depth and weak tensile strength.

[0071] Example 2

[0072] See also Figure 1-Figure 7 The embodiment of the present invention provides an anchor cable device, which includes an anchor pier, an anchor 13 and the anchor cable 1 in the first embodiment.

[0073] The anchor pier is used to be placed on the anchor hole 2, and the anchor pier includes a pad assembly, which is in contact with the anchor 13, and a central hole is provided in the middle of the pad assembly for passing the anchor cable 1. The pad assembly is also provided with a connecting hole, and the end of the anchor cable 1 away from the guide cap 6 is connected to the anchor 13.

[0074] The pad assembly includes a pad 11 and a pad 2 12, the pad 11 and the pad 2 12 are overlapped and fixedly connected, the pad 11 is larger than the pad 2 12, and the connection hole is provided on the pad 11. The pad 11 is anchored on the rock wall by bolts.

[0075] Specifically, the backing plate 11 and the backing plate 2 12 are connected by a fillet weld 21 .

[0076] The anchor cable 1 device also includes a leveling layer, a protective net 17 and 20 layers of steel fiber sprayed concrete; the protective net 17 is coated on the anchor pier, and the outside of the protective net 17 is covered and closed with the 20 layers of steel fiber sprayed concrete; the leveling layer is arranged inside the 20 layers of steel fiber sprayed concrete, the surface of the leveling layer is flush with the surface of the rock wall, and the edge of the protective net 17 is used to anchor into the bedrock.

[0077] Furthermore, bolt holes 19 and protective net anchor holes 18 are provided on the bedrock. The bolt holes 19 are used to cooperate with the connection holes, so as to facilitate the connection of the pad 11 to the bedrock. After the pad 11 is connected to the bolt holes 19, cement can be poured into the bolt holes 19 for filling. The edge of the protective net 17 is anchored into the protective net anchor hole 18. After anchoring, cement slurry is poured into the protective net anchor hole 18 for filling.

[0078] The beneficial effects of the anchor cable 1 device provided by the embodiment of the present invention are:

[0079] This anchor cable device is based on the anchor cable 1 provided in Example 1, which has greater tensile strength and is better for reinforcing unstable rock masses on the top wall of large caves, overcoming the defects of traditional anchor rods with small reinforcement depth and weak tensile strength.

[0080] Example 3

[0081] The embodiment of the present invention provides a grouting construction method, which comprises the following steps:

[0082] A1. Drilling;

[0083] Specifically, the hole position is determined by on-site construction, and the drilling rig is used for precise positioning, drilling, hole cleaning and inspection.

[0084] A2. Place anchor cable 1 into the drill hole, push it upwards and temporarily fix it

[0085] Place the prepared anchor cable 1 into the drill hole;

[0086] Furthermore, the distance between the exhaust pipe 7 and the bottom of the hole is greater than the distance between the primary grouting pipe 9 and the secondary high-pressure grouting pipe 10 and the bottom of the hole, and the distance between the orifice plugging grouting pipe 8 and the bottom of the hole is less than the distance between the primary grouting pipe 9 and the secondary high-pressure grouting pipe 10.

[0087] In this embodiment, the exhaust pipe 7 of the anchor cable 1 is 0.1 meters away from the bottom of the hole, and the distance between the primary grouting pipe 9 and the secondary high-pressure grouting pipe 10 of the anchor cable 1 and the bottom of the hole is 0.6 meters. The length of the hole-sealing grouting pipe 8 is 5 meters;

[0088] A3. Install grout stoppers at the second anchor hole;

[0089] A4. Chisel away a certain depth of rock wall at the two anchor holes and apply a leveling layer;

[0090] A5. Install and fix the anchor pier;

[0091] A6. Orifice plugging grouting: grouting is performed in the borehole through the orifice plugging grouting pipe 8. The grouting height exceeds the orifice plugging grouting pipe 8. If there is slurry backflowing from the plugging grouting pipe, the grouting is stopped to ensure the borehole is sealed;

[0092] A7. Primary pressure grouting: before the initial setting of the grouting for plugging the hole, grouting is performed in the borehole through the primary grouting pipe 9, and the air is exhausted through the exhaust pipe 7 until the exhaust pipe 7 is filled with grouting;

[0093] Specifically, during the process of step A7, the grouting shall not be stopped midway, and the grouting in the hole must be full and dense until there is no bubble in the grouting return from the exhaust pipe 7 at the bottom of the hole. In this embodiment, the grouting pressure used in step A3 can be selected to be 0.6-0.8MPa.

[0094] A8. Secondary high-pressure grouting: before the primary grouting liquid sets, secondary high-pressure grouting is performed in the borehole through the secondary high-pressure grouting pipe 10;

[0095] Specifically, during step A8, the hole is filled with slurry fully and densely, and the grouting pressure is determined according to the on-site grouting test.

[0096] A9. After the slurry has finally set and the strength reaches the designed strength, install the anchor 13, tension it and lock it;

[0097] A10. A protective net 17 is set outside the anchor 13, and then steel fiber sprayed concrete 20 is used to cover and seal it.

[0098] Specifically, in step A9 and step A10, the mortar leveling layer at the upper end of the drilling hole is installed, the pad 11, the pad 2 12 and the anchor 13 are installed, the anchor cable 1 is tensioned and locked at the hole, and the steel fiber concrete 20 is sealed; preferably, the bolt hole 19 and the connection hole on the pad assembly are connected by the bolt rod 14, and then the washer 15 and the nut 16 are added to the pad assembly, so as to realize the connection between the pad assembly and the bedrock. The edge of the protective net 17 is anchored into the protective net anchor hole 18.

[0099] Preferably, the bolt holes 19 and the protective net anchor holes 18 are filled with cement grout.

[0100] After the above steps are completed, the anchor cable device provided in Example 2 is formed at the construction site.

[0101] Preferably, before step A1 is performed, a method for manufacturing the anchor cable 1 is performed, and the method for manufacturing the anchor cable 1 comprises the following steps:

[0102] S1. Prepare the steel strand 22, set an isolation frame 3 at a preset distance, and make the isolation frame 3 pass through the hole to block the grouting pipe 8, the primary grouting pipe 9, the secondary high-pressure grouting pipe 10 and the exhaust pipe 7, and seal the four pipes with glass glue;

[0103] Specifically, in the present embodiment, the preset distance is one meter, that is, an isolation frame 3 is arranged every one meter. The number of steel strands 22 is nine, so that the nine steel strands 22 pass through the nine strand holes 22a on the isolation frame 3 respectively. The orifice plugging grouting pipe 8 passes through the orifice plugging grouting hole 8a on the isolation frame 3. The primary grouting pipe 9 passes through the primary grouting hole 9a on the isolation frame 3. The secondary high-pressure grouting pipe 10 passes through the secondary high-pressure grouting hole 10a on the isolation frame 3. The exhaust pipe 7 passes through the exhaust hole 7a on the isolation frame 3. After the above-mentioned pipes pass through the isolation frame 3, the holes on the isolation frame 3 are sealed with glass glue.

[0104] After S1 is completed, the following steps are also included:

[0105] S11. A centering bracket 4 is provided outside a portion of the isolation frame 3 so that the centering bracket 4 is fixedly connected to the isolation frame 3;

[0106] Specifically, a centering bracket 4 is provided every three isolation frames 3, that is, a centering bracket 4 is provided every four meters.

[0107] S12. Install a clamp ring 5 between two adjacent isolation frames 3.

[0108] S2. Install the guide cap 6 at the end of the anchor cable 1 so that the guide cap 6 is connected to the ends of all the steel strands 22.

[0109] The order of step S11, step S12 and step S2 can be swapped.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grouting construction method, characterized in that: The anchor cable (1) comprises a hole-blocking grouting pipe (8), a primary grouting pipe (9), a secondary high-pressure grouting pipe (10), an exhaust pipe (7), an isolation frame (3), a guide cap (6) and at least two strands (22); The length of the primary grouting pipe (9) is greater than the length of the orifice plugging grouting pipe (8); the length of the exhaust pipe (7) is greater than the length of the primary grouting pipe (9); the length of the secondary high-pressure grouting pipe (10) is greater than the length of the exhaust pipe (7); the isolation frame (3) is provided with a stranding wire hole (22a) for the stranding wire (22) to pass through, an orifice plugging grouting hole (8a) for the orifice plugging grouting pipe (8) to pass through, a primary grouting hole (9a) for the primary grouting pipe (9) to pass through, a secondary high-pressure grouting hole (10a) for the secondary high-pressure grouting pipe (10) to pass through, and an exhaust hole (7a) for the exhaust pipe (7) to pass through; The guide cap (6) is arranged at the end of the stranded wire (22) and is connected to the at least two stranded wires (22); When the anchor cable (1) is placed in the anchor hole (2), the distance between the secondary high-pressure grouting pipe (10) and the bottom of the hole is smaller than the distance between the exhaust pipe (7) and the bottom of the hole, the distance between the exhaust pipe (7) and the bottom of the hole is smaller than the distance between the primary grouting pipe (9) and the bottom of the hole, and the distance between the hole-sealing grouting pipe (8) and the bottom of the hole is larger than the distance between the primary grouting pipe (9) and the bottom of the hole; The following steps are involved: A1. Drilling; A2. Place the anchor cable (1) into the drill hole, push it upwards into place and temporarily secure it; A3. Install a grout stopper at the anchor hole (2); A3. Chisel away a certain depth of rock wall at the mouth of the anchor hole (2) and apply a leveling layer; A4. Install and fix the anchor pier; A5. Orifice plugging grouting, grouting is performed in the borehole through the orifice plugging grouting pipe (8), the grouting height overflows the orifice plugging grouting pipe (8), and the grouting is stopped when there is slurry backflowing from the plugging grouting pipe to ensure that the borehole is sealed; A6. After the hole-sealing grouting has finally set, grouting is performed in the borehole through the primary grouting pipe (9) until the exhaust pipe (7) returns to grouting; A7. Before the slurry initially sets, secondary high-pressure grouting is performed in the borehole through a secondary high-pressure grouting pipe (10); A8. After the slurry has finally set and the strength reaches the designed strength, the anchor (13) is installed, tensioned and locked; A9. A protective net (17) is set outside the anchor (13), and then covered and sealed with sprayed steel fiber concrete.

2. The grouting construction method according to claim 1, characterized in that: At least two spacer frames (3) are arranged at intervals along the length direction of the anchor cable (1).

3. The grouting construction method according to claim 2, characterized in that: The anchor cable (1) further comprises a centering bracket (4), wherein the centering bracket (4) is sleeved on the outside of the isolation frame (3) and connected to the isolation frame (3).

4. The grouting construction method according to claim 2, characterized in that: A tightening ring (5) is provided between two adjacent isolation frames (3), and the tightening ring (5) is used to tighten the stranded wire (22).

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