Construction method of anchor cable with multi-depth layered high-pressure grouting

Abstract

The present application relates to the technical field of anchor cable, disclose a kind of anchor cable construction method of multiple depth layered high-pressure grouting, comprising the following construction steps:1), anchor cable, first grouting pipe and high-pressure grouting pipe are simultaneously lowered into anchor hole, grouting gun is arranged in high-pressure grouting pipe;2), first grouting pipe is first grouted in anchor hole;3), grouting gun is moved to set position, grouting gun is in fixed state, grouting gun sprays slurry, and slurry is split into soil layer;4), grouting gun stops spraying slurry, and grouting gun is in active state;5), repeat construction steps 3) and 4), until split grouting of anchor hole is completed, high-pressure grouting pipe is cleaned;6), repeat construction step 5), until multiple split grouting of anchor hole is completed;It can realize segmented multiple split grouting, greatly improve grouting effect, and multiple split grouting can not be limited by times.

Description

Technical Field

[0001] This invention relates to the technical field of anchor cables, and more specifically, to an anchor cable construction method using multi-depth layered high-pressure grouting. Background Technology

[0002] Anchor cables reinforce rock masses or structures by applying prestress. They include an inner anchorage section, a free section, and an outer anchorage section. The inner anchorage section is fixed to stable rock strata, while the outer anchorage section includes an anchor and a concrete base to achieve stress locking.

[0003] During the construction process, after the anchor cable is lowered into the anchor hole, the anchor cable is grouted for the first time using the initial grouting pipe. The grout fills the anchor hole and fixes the anchor cable in the anchor hole. Subsequently, the anchor cable is grouted again using the high-pressure grouting pipe until the set number of grouting times and grouting requirements are met.

[0004] In existing technologies, during the supplementary grouting process, the entire high-pressure grouting pipe is sprayed with grout, making it impossible to perform segmented and multiple grouting. This makes it difficult to grout according to the actual situation, greatly reducing the grouting effect. Summary of the Invention

[0005] The purpose of this invention is to provide a method for anchor cable construction using multi-depth layered high-pressure grouting, which aims to solve the problem that high-pressure grouting pipes cannot achieve segmented and multiple grouting in the prior art.

[0006] This invention is implemented as follows: a multi-depth, layered, high-pressure grouting method for anchor cable construction, comprising the following construction steps: 1) Arrange the initial grouting pipe and the high-pressure grouting pipe on the anchor cable, and simultaneously lower the anchor cable, the initial grouting pipe and the high-pressure grouting pipe into the anchor hole; the inner end of the high-pressure grouting pipe is closed, and the outer periphery of the high-pressure grouting pipe is provided with multiple grouting holes; the outer periphery of the high-pressure grouting pipe is fitted with a movable elastic membrane layer, and the elastic membrane layer elastically covers the grouting holes. The high-pressure grouting pipe is equipped with a grouting gun, which is connected to a grouting pipe. The grouting gun has multiple grout outlet holes on its outer periphery. The grouting gun is fitted with two expansion rings that expand outward or contract inward, and the expansion rings are made of elastic material. The two expansion rings are arranged at an axial distance along the grouting gun, and the expansion rings are arranged around the circumference of the grouting gun, with a plurality of grout outlet holes located between the two expansion rings; 2) Initial grouting is performed in the anchor hole through the initial grouting pipe; 3) After moving the grouting gun to the set position in the high-pressure grouting pipe, drive the two expansion rings to expand elastically outward so that the expansion rings abut against the high-pressure grouting pipe, the grouting gun and the high-pressure grouting pipe are fixed relative to each other, and the grouting gun is in a fixed state; When the grouting gun is in a fixed state, the grouting gun and the high-pressure grouting pipe form an axially closed annular area. The grouting gun sprays grout into the annular area through the grout outlet. When the grouting pressure is greater than the set pressure value, the elastic membrane layer expands elastically outward, the grouting outlet is in the open state, and the grout is sprayed out through the grouting outlet and injected into the soil layer in a splitting manner. 4) The grouting gun stops spraying grout, the elastic membrane layer contracts inward elastically, and the grouting hole is in a closed state; the expansion ring contracts inward elastically, the grouting gun and the high-pressure grouting pipe move relative to each other, and the grouting gun is in a moving state; 5) Repeat construction steps 3) and 4) until the split grouting of the anchor hole is completed. Then clean the high-pressure grouting pipe and fill it with water before closing the check valve. 6) Repeat construction step 5) until the anchor hole has been grouted multiple times.

[0007] Furthermore, in construction step 2), the grouting pressure of the first grouting pipe grouting in the anchor hole is 1MPa~2MPa; Furthermore, in construction step 2), the grouting pressure of the grouting gun is 2 MPa ~ 30 MPa.

[0008] Furthermore, in construction step 1), the inner end of the high-pressure grouting pipe has a closed end, the closed end has an inner end opening, and the inner end opening is provided with an elastic head, the elastic head closing the inner end opening.

[0009] Furthermore, in construction step 1), the closed end is fitted with a cap, the bottom of which covers the inner end opening and abuts against the elastic head from top to bottom; the outer periphery of the cap forms an outer periphery, which surrounds the outer periphery of the closed end, and an annular hoop is fitted around the outer periphery of the outer periphery, which fixes the outer periphery to the closed end.

[0010] Furthermore, in construction step 1), the top of the elastic head is recessed downwards to form a conical top groove, and the outer periphery of the top groove protrudes outwards to form an outer peripheral groove. The outer peripheral groove is arranged around the circumference of the elastic head. The bottom of the outer peripheral groove has a groove bottom wall, and the groove bottom wall is arranged inclined upwards along the direction from the inside to the outside. The top groove is formed on the upper part of the elastic head, and a rigid central shaft is built into the lower part of the elastic head. The bottom of the central shaft extends to the bottom of the elastic head, and the top of the central shaft extends to the bottom of the top groove and is exposed in the top groove. When the elastic head is subjected to downward pressure, the downward pressure is applied to the inner sidewall of the top groove and the bottom wall of the groove, generating radial pressure on the elastic head.

[0011] Furthermore, in construction step 1), the expansion ring includes an inner annular ring wall and an outer annular ring wall that expands elastically outward or contracts elastically inward. The inner annular ring wall is arranged around the circumference of the grouting gun and fixed to the outer circumference of the grouting gun. The outer annular ring wall is arranged around the circumference of the inner annular ring wall, and the outer annular ring wall and the inner annular ring wall form an annular cavity. In construction step 3), the internal pressure of the annular cavity is increased, and the outer annular wall expands elastically outward until the outer annular wall abuts against the high-pressure grouting pipe. The expansion ring is fixed on the high-pressure grouting pipe so that the grouting gun is in a fixed state. In construction step 4), the internal pressure of the annular cavity is reduced, and the outer annular wall elastically contracts inward until the outer annular wall disengages from the high-pressure grouting pipe, and the grouting gun is in an active state.

[0012] Furthermore, in the construction step 1), the outer ring wall is provided with a plurality of arc-shaped strips that are curved in an arc shape. The plurality of arc-shaped strips are arranged around the outer ring wall at intervals in the circumference. The plurality of arc-shaped strips enclose to form a discontinuously arranged deformable ring. The deformable ring is arranged at an angle to the axial direction of the grouting gun. In construction step 3), during the outward elastic expansion of the outer ring wall, multiple arc-shaped strips expand outward synchronously with the outer ring wall, and the deformable ring expands outward synchronously until the outer ring wall is fixed on the high-pressure grouting pipe, and the deformable ring supports the outer ring wall in an inclined manner. In construction step 4), during the process of the outer ring wall elastically contracting inward, multiple arc-shaped strips retract inward synchronously with the outer ring wall, and the deformed ring retracts inward synchronously until the outer ring wall detaches from the high-pressure grouting pipe.

[0013] Furthermore, in construction step 1), a plurality of deformable rings are formed in the outer ring wall, and the plurality of deformable rings are arranged at intervals along the axial direction of the grouting gun; the multiple deformable rings have different inclination angles from the axial direction of the grouting gun. In construction step 3), when the outer ring wall is fixed on the high-pressure grouting pipe, multiple deformable rings support the outer ring wall at multiple angles and positions.

[0014] Furthermore, in construction step 3), the expansion ring has an inward ring facing the annular area, the inward ring is connected to the outer ring wall and the outer ring wall respectively, the inward ring is arranged around the circumference of the grouting gun, and the inward rings of the two expansion rings are arranged facing each other. The inner ring is provided with multiple rigid inclined ring pieces, which are arranged around the circumference of the grouting gun and nested in sequence; the inclined ring pieces are arranged inclined towards the outer ring wall in the direction from bottom to top. After the outer ring is fixed to the high-pressure grouting pipe, during the process of the grouting gun spraying grout into the annular area through the grout outlet, the grout in the annular area presses against the inclined ring plate to apply radial pressure to the outer ring wall.

[0015] Compared with the prior art, the anchor cable construction method of multi-depth layered high-pressure grouting provided by the present invention arranges grouting guns in high-pressure grouting pipes. After the first grouting is completed using the first grouting pipe, when supplementary grouting is required, the grouting guns are moved to a set position in the high-pressure grouting pipe, and the grouting guns are fixed in a fixed state using expansion rings. The grouting guns can then achieve point-splitting grouting. In this way, by moving the grouting guns multiple times in the high-pressure grouting pipe, segmented and multiple splitting grouting can be achieved, which greatly improves the grouting effect. Secondly, after the split grouting of the anchor hole is completed, the grout in the high-pressure grouting pipe is discharged to avoid the problem of grout residue in the high-pressure grouting pipe blocking the pipe and preventing subsequent split grouting. This ensures that the high-pressure grouting pipe is unobstructed. After each grouting is completed, this method can be used to achieve multiple split grouting. Theoretically, as long as the grout in the high-pressure grouting pipe is completely discharged, there is no limit to the number of split grouting operations. In addition, the outer periphery of the high-pressure grouting pipe is fitted with an elastic structure, which can flexibly open or close the grouting hole, restrict the backflow of grout, and greatly improve the grouting effect. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the anchor cable construction method for multi-depth layered high-pressure grouting provided by the present invention. Figure 2 This is a schematic diagram of the structure for segmented multiple splitting grouting construction of anchor cables provided by the present invention; Figure 3 This is an internal schematic diagram of the closed end and the elastic head provided by the present invention; Figure 4 This is an internal schematic diagram of the grouting gun fixed in the high-pressure grouting pipe provided by the present invention; Figure 5 This is a schematic diagram of the internal structure of the expansion ring provided by the present invention; Figure 6This is a front view schematic diagram of the axially inclined arrangement of the deformation ring and the grouting gun provided by the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0019] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Reference Figure 1-6 The image shows a preferred embodiment of the present invention.

[0021] The anchor cable construction method using multi-depth, layered, high-pressure grouting includes the following construction steps: 1) A primary grouting pipe 300 and a high-pressure grouting pipe 200 are arranged on the anchor cable 400. The anchor cable 400, the primary grouting pipe 300 and the high-pressure grouting pipe 200 are simultaneously lowered into the anchor hole 100. The inner end of the high-pressure grouting pipe 200 is closed, and a check valve is installed at the outer end of the high-pressure grouting pipe 200. Multiple grouting holes 203 are provided on the outer periphery of the high-pressure grouting pipe 200. A movable elastic membrane layer 209 is sleeved on the outer periphery of the high-pressure grouting pipe 200, and the elastic membrane layer 209 elastically covers the grouting holes 203. The high-pressure grouting pipe 200 is equipped with a grouting gun 500, which is connected to a grouting pipe. The grouting gun 500 has multiple grout outlet holes on its outer periphery. The grouting gun 500 is fitted with two expansion rings 600 that expand outward or contract inward, and the expansion rings 600 are made of elastic material. Two expansion rings 600 are arranged at intervals along the axial direction of the grouting gun 500, and the expansion rings 600 are arranged around the circumference of the grouting gun 500. Multiple grout outlet holes are located between the two expansion rings 600. 2) Initial grouting is performed in anchor hole 100 through initial grouting pipe 300; 3) After the grouting gun 500 is moved to the set position in the high-pressure grouting pipe 200, the two expansion rings 600 are driven to expand elastically outward so that the expansion rings 600 abut against the high-pressure grouting pipe 200, and the grouting gun 500 and the high-pressure grouting pipe 200 are relatively fixed, and the grouting gun 500 is in a fixed state; when the grouting gun 500 is in a fixed state, the grouting gun 500 and the high-pressure grouting pipe 200 form an axially closed annular area 501. The grouting gun 500 sprays grout into the annular area 501 through the grout outlet. When the grouting pressure is greater than the set pressure value, the elastic membrane layer 209 expands elastically outward, the grouting hole 203 is in the open state, and the grout is sprayed out through the grouting hole 203 and injected into the soil layer in a splitting manner. 4) The grouting gun 500 stops spraying grout, the elastic membrane layer 209 contracts inward, and the grouting hole 203 is closed; the expansion ring 600 contracts inward, and the grouting gun 500 and the high-pressure grouting pipe 200 move relative to each other, so the grouting gun 500 is in an active state. 5) Repeat construction steps 3) and 4) until the split grouting of anchor hole 100 is completed. Then clean the high-pressure grouting pipe 200 so that it is filled with water and then close the check valve. 6) Repeat construction step 5) until multiple splitting grouting operations are completed in anchor hole 100.

[0022] The above-mentioned multi-depth layered high-pressure grouting anchor cable construction method involves arranging a grouting gun 500 in the high-pressure grouting pipe 200. After the initial grouting is completed using the initial grouting pipe 300, when supplementary grouting is required, the grouting gun 500 is moved to a set position in the high-pressure grouting pipe 200, and the expansion ring 600 is used to fix the grouting gun 500 in a fixed state. The grouting gun 500 can then achieve point-to-point splitting grouting, realizing multi-depth layered high-pressure grouting. In this way, by moving the grouting gun 500 multiple times in the high-pressure grouting pipe 200, segmented and multiple splitting grouting can be achieved, greatly improving the grouting effect. Secondly, after the split grouting of the anchor hole 100 is completed, the grout in the high-pressure grouting pipe 200 is discharged. This can prevent the grout from remaining in the high-pressure grouting pipe 200 and blocking it, which would prevent subsequent split grouting from continuing. By ensuring that the high-pressure grouting pipe 200 is unobstructed, this method can be used to achieve multiple split groutings after each grouting is completed. Theoretically, as long as the grout in the high-pressure grouting pipe 200 is completely discharged, there is no limit to the number of split groutings. In addition, an elastic membrane layer 209 is fitted around the outer periphery of the high-pressure grouting pipe 200, which can flexibly open or close the grouting hole 203, restrict the backflow of grout, and greatly improve the grouting effect.

[0023] In this embodiment, the two expansion rings 600 have the function of elastically expanding outward and elastically contracting inward. The elastic deformation of the expansion rings 600 is achieved by external pressure or pressure reduction. When the expansion rings 600 elastically expand outward, the position of the grouting gun 500 is fixed, and the grouting position is fixed. When the expansion rings 600 elastically contract inward, the grouting gun 500 is movable and can move within the high-pressure grouting pipe 200. The movement and positioning can be achieved by the external length of the grouting gun 500 or by a positioning device.

[0024] Before grouting, the grouting gun 500 moves to the designated position in the high-pressure grouting pipe 200 and pressurizes the two expansion rings 600 so that the expansion rings 600 expand elastically outward. The expansion rings 600 are fixed to the high-pressure grouting pipe 200, and the grouting gun 500 is fixed in the designated position. Grouting is performed using the grouting gun 500. The grout enters the high-pressure grouting pipe 200 through the grout outlet. When the pressure of the grout reaches a certain value, the grout breaks through the restriction of the elastic membrane layer 209 on the grouting hole 203 and is injected into the soil. When the pressure is sufficient, splitting grouting of the soil can be achieved. When the grouting gun 500 stops grouting, the grout injected into the soil is prevented from returning to the high-pressure grouting pipe 200 due to the resistance of the elastic membrane layer 209 of the grouting hole 203 on the high-pressure grouting pipe 200.

[0025] After the expansion ring 600 on the grouting gun 500 is depressurized, it will automatically contract inward elastically and separate from the high-pressure grouting pipe 200. Then the grouting gun 500 is moved to the next designated position, and the above grouting process is repeated. By doing so, segmented grouting of the anchor cable 400 can be achieved, which is to achieve multi-depth layered grouting.

[0026] After the grouting of the anchor cable 400 segments is completed, the inside of the high-pressure grouting pipe 200 is cleaned by injecting water using a grouting gun 500. After cleaning, the end of the high-pressure grouting pipe 200 is closed.

[0027] After a period of time, the above-mentioned segmented grouting process is repeated to perform segmented grouting on anchor cable 400 again. Based on the grouting parameters of the previous grouting, such as grouting pressure and flow rate, the parameters for this segmented grouting are determined. After this segmented grouting, the high-pressure grouting pipe 200 is cleaned and sealed again. This process is repeated to achieve multiple segmented splitting grouting of anchor cable 400.

[0028] As an extended embodiment, in construction step 2), the grouting pressure of the first grouting pipe 300 grouting in the anchor hole 100 is 1MPa~2MPa, the grouting pressure of the grouting gun 500 is 5MPa~30MPa, and the maximum withstand pressure of the high-pressure grouting pipe 200 is 40MPa.

[0029] In this embodiment, fluid, gas, etc., can be injected into the expansion ring 600 to cause the expansion ring 600 to expand elastically outward. The grouting gun 500 can perform fracturing grouting at atmospheric pressure, high pressure, and ultra-high pressure.

[0030] As an extended embodiment, in construction step 1), the inner end of the high-pressure grouting pipe 200 has a closed end 201, the closed end 201 has an inner end opening, and the inner end opening is provided with an elastic head 202, which closes the inner end opening.

[0031] As an extended embodiment, in construction step 1), the closed end 201 is fitted with a cap 210, the bottom of the cap 210 covers the inner end opening, and abuts against the elastic head 202 from top to bottom; the outer periphery of the cap 210 forms an outer periphery 203, the outer periphery 203 surrounds the outer periphery of the closed end 201, and an annular hoop 204 surrounds the outer periphery 203, which fixes the outer periphery 203 to the closed end 201.

[0032] In this way, when the elastic head 202 is inserted into the inner end opening, the inner end opening is closed, and the cap 210 is fitted on the closed end 201. The cap 210 further restricts the elastic head 202, and the annular clamp 204 fixes the cap 210 on the closed end 201, thus achieving double closure of the inner end opening.

[0033] As an extended embodiment, in construction step 1), the top of the elastic head 202 is recessed downwards to form a conical top groove 205, and the outer periphery of the top groove 205 protrudes outwards to form an outer peripheral groove 206. The outer peripheral groove 206 is arranged around the circumference of the elastic head 202. The bottom of the outer peripheral groove 206 has a groove bottom wall 207, and the groove bottom wall 207 is arranged inclined upwards along the direction from the inside to the outside. A top groove 205 is formed on the upper part of the elastic head 202, and a rigid central shaft 211 is built into the lower part of the elastic head 202. The bottom of the central shaft 211 extends to the bottom of the elastic head 202, and the top of the central shaft 211 extends to the bottom of the top groove 205 and is exposed in the top groove 205.

[0034] During the process of the elastic head 202 bearing downward pressure, the downward pressure is applied to the inner wall of the top groove 205 and the bottom wall 207 of the groove, generating radial pressure on the elastic head 202. In addition, since the lower part of the elastic head 202 has a built-in central shaft 211, the elastic head 202 undergoes elastic deformation around the central shaft 211 as the deformation center during the deformation process, so as to ensure the uniformity of the elastic deformation of the elastic head 202.

[0035] In this way, when the elastic head 202 is subjected to downward pressure, the downward pressure generates radial pressure on the elastic head 202, so that the elastic head 202 is more firmly pressed against the closed end 201, further stabilizing and pressing the elastic head 202 so that the elastic head 202 is not easy to detach.

[0036] As an extended embodiment, in construction step 1), the expansion ring 600 includes an inner annular wall 603 and an outer annular wall 602 that expands elastically outward or contracts elastically inward. The inner annular wall 603 is arranged around the circumference of the grouting gun 500 and is fixed to the outer circumference of the grouting gun 500. The outer annular wall 602 is arranged around the circumference of the inner annular wall 603, and the outer annular wall 602 and the inner annular wall 603 enclose an annular cavity 601. In construction step 3), the internal pressure of the annular cavity 601 is increased, and the outer annular wall 602 expands elastically outward until the outer annular wall 602 abuts against the high-pressure grouting pipe 200, and the expansion ring 600 is fixed on the high-pressure grouting pipe 200 so that the grouting gun 500 is in a fixed state. In construction step 4), the internal pressure of the annular cavity 601 is reduced, and the outer annular wall 602 elastically contracts inward until the outer annular wall 602 disengages from the high-pressure grouting pipe 200, and the grouting gun 500 is in an active state.

[0037] In this way, the internal pressure of the annular cavity 601 can be increased by injecting high-pressure media, such as various liquids or gases, or the internal pressure of the annular cavity 601 can be reduced by extracting high-pressure media, which is convenient to operate.

[0038] As an extended embodiment, in construction step 1), the outer ring wall 602 is provided with a plurality of arc-shaped strips 606 that are curved in an arc shape. The plurality of arc-shaped strips 606 are arranged around the outer ring wall 602 at intervals in the circumference. The plurality of arc-shaped strips 606 enclose to form a discontinuously arranged deformable ring 607. The deformable ring 607 is arranged at an inclination to the axial direction of the grouting gun 500. In construction step 3), during the outward elastic expansion of the outer ring wall 602, multiple arc-shaped strips 606 expand outward synchronously with the outer ring wall 602, and the deformable ring 607 expands outward synchronously until the outer ring wall 602 is fixed on the high-pressure grouting pipe 200, and the deformable ring 607 supports the outer ring wall 602 in an inclined manner. In construction step 4), during the process of the outer ring wall 602 elastically contracting inward, multiple arc-shaped strips 606 retract inward synchronously with the outer ring wall 602, and the deformed ring 607 retracts inward synchronously until the outer ring wall 602 detaches from the high-pressure grouting pipe 200.

[0039] First, by arranging multiple arc-shaped strips 606 to form an inclined deformable ring 607, the outward elastic expansion or inward elastic contraction of the outer ring wall 602 can be positioned. Secondly, when the outer ring wall 602 expands elastically outward, the deformable ring 607 also expands outward simultaneously. The deformable ring 607 can tilt to support the high-pressure grouting pipe 200, and when the expansion ring 600 is subjected to compressive force, it can make the outer ring wall 602 more firmly fixed in the high-pressure grouting pipe 200, avoiding loosening or slippage.

[0040] As an extended embodiment, in construction step 1), a plurality of the aforementioned deformable rings 607 are formed in the outer annular wall 602, and the plurality of deformable rings 607 are arranged at intervals along the axial direction of the grouting gun 500; the multiple deformable rings 607 have different inclination angles from the axial direction of the grouting gun 500. In construction step 3), when the outer ring wall 602 is fixed on the high-pressure grouting pipe 200, multiple deformable rings 607 support the outer ring wall 602 at multiple angles and positions.

[0041] By arranging multiple deformation rings 607 with different inclination directions, support for the outer ring wall 602 can be formed at multiple positions and angles, so that the outer ring wall 602 is more firmly fixed on the high-pressure grouting gun 500, and further avoids deformation of the outer ring wall 602 in the fixed state.

[0042] As an extended embodiment, in construction step 3), the expansion ring 600 has an inner ring 604 facing the annular region 501. The inner ring 604 is connected to the outer ring wall 602 and the outer ring wall 602 respectively. The inner ring 604 is arranged around the circumference of the grouting gun 500, and the inner rings 604 of the two expansion rings 600 are arranged facing each other. Multiple rigid inclined ring pieces 605 are provided on the inner ring 604. The inclined ring pieces 605 are arranged around the circumference of the grouting gun 500, and the multiple inclined ring pieces 605 are nested in sequence. Along the direction of the inclined ring pieces 605 from bottom to top, the inclined ring pieces 605 are inclined towards the outer ring wall 602. After the outer ring is fixed on the high-pressure grouting pipe 200, during the process of the grouting gun 500 spraying grout into the annular region 501 through the grout outlet, the grout in the annular region 501 presses against the inclined ring plate 605 to apply radial pressure to the outer ring wall 602.

[0043] In this way, by forming inclined ring pieces 605, during the high-pressure grouting process, the grout will squeeze the inclined ring pieces 605, and the pressure on the outer ring wall 602 between the inclined ring pieces 605 can make the outer ring wall 602 more firmly fixed in the high-pressure grouting pipe 200, and the pressure on the inner ring 604 is distributed in multiple positions, so that the expansion ring 600 is more firmly fixed on the high-pressure grouting pipe 200.

[0044] 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 within the protection scope of the present invention.

Claims

1. A method for anchor cable construction using multi-depth layered high-pressure grouting, characterized in that, The construction steps include the following: 1) Arrange the initial grouting pipe and the high-pressure grouting pipe on the anchor cable, and simultaneously lower the anchor cable, the initial grouting pipe and the high-pressure grouting pipe into the anchor hole; the inner end of the high-pressure grouting pipe is closed, and the outer periphery of the high-pressure grouting pipe is provided with multiple grouting holes; the outer periphery of the high-pressure grouting pipe is fitted with a movable elastic membrane layer, and the elastic membrane layer elastically covers the grouting holes. The high-pressure grouting pipe is equipped with a grouting gun, which is connected to a grouting pipe. The grouting gun has multiple grout outlet holes on its outer periphery. The grouting gun is fitted with two expansion rings that expand outward or contract inward, and the expansion rings are made of elastic material. The two expansion rings are arranged at an axial distance along the grouting gun, and the expansion rings are arranged around the circumference of the grouting gun, with a plurality of grout outlet holes located between the two expansion rings; 2) Initial grouting is performed in the anchor hole through the initial grouting pipe; 3) After moving the grouting gun to the set position in the high-pressure grouting pipe, drive the two expansion rings to expand elastically outward so that the expansion rings abut against the high-pressure grouting pipe, the grouting gun and the high-pressure grouting pipe are fixed relative to each other, and the grouting gun is in a fixed state; When the grouting gun is in a fixed state, the grouting gun and the high-pressure grouting pipe form an axially closed annular area. The grouting gun sprays grout into the annular area through the grout outlet. When the grouting pressure is greater than the set pressure value, the elastic membrane layer expands elastically outward, the grouting outlet is in the open state, and the grout is sprayed out through the grouting outlet and injected into the soil layer in a splitting manner. 4) The grouting gun stops spraying grout, the elastic membrane layer contracts inward elastically, and the grouting hole is in a closed state; the expansion ring contracts inward elastically, the grouting gun and the high-pressure grouting pipe move relative to each other, and the grouting gun is in a moving state; 5) Repeat construction steps 3) and 4) until the split grouting of the anchor hole is completed. Then clean the high-pressure grouting pipe and fill it with water before closing the check valve. 6) Repeat construction step 5) until the anchor hole has been grouted multiple times.

2. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 1, characterized in that, In construction step 2), the grouting pressure of the first grouting pipe in the anchor hole is 1 MPa to 2 MPa.

3. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 1, characterized in that, In construction step 2), the grouting pressure of the grouting gun is 2 MPa ~ 30 MPa.

4. The anchor cable construction method using multi-depth layered high-pressure grouting as described in any one of claims 1 to 3, characterized in that, In construction step 1), the inner end of the high-pressure grouting pipe has a closed end, the closed end has an inner end opening, and the inner end opening is provided with an elastic head, which closes the inner end opening.

5. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 4, characterized in that, In construction step 1), the closed end is fitted with a cap, the bottom of which covers the inner end opening and abuts against the elastic head from top to bottom; the outer periphery of the cap forms an outer periphery, which surrounds the outer periphery of the closed end, and an annular hoop is fitted around the outer periphery of the outer periphery, which fixes the outer periphery to the closed end.

6. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 4, characterized in that, In construction step 1), the top of the elastic head is recessed downwards to form a conical top groove, and the outer periphery of the top groove protrudes outwards to form an outer peripheral groove. The outer peripheral groove is arranged around the circumference of the elastic head. The bottom of the outer peripheral groove has a groove bottom wall, and the groove bottom wall is arranged inclined upwards along the direction from the inside to the outside. The top groove is formed on the upper part of the elastic head, and a rigid central shaft is built into the lower part of the elastic head. The bottom of the central shaft extends to the bottom of the elastic head, and the top of the central shaft extends to the bottom of the top groove and is exposed in the top groove. When the elastic head is subjected to downward pressure, the downward pressure is applied to the inner sidewall of the top groove and the bottom wall of the groove, generating radial pressure on the elastic head.

7. The anchor cable construction method using multi-depth layered high-pressure grouting as described in any one of claims 1 to 3, characterized in that, In construction step 1), the expansion ring includes an inner annular ring wall and an outer annular ring wall that expands elastically outward or contracts elastically inward. The inner annular ring wall is arranged around the circumference of the grouting gun and is fixed to the outer circumference of the grouting gun. The outer annular ring wall is arranged around the circumference of the inner annular ring wall, and the outer annular ring wall and the inner annular ring wall form an annular cavity. In construction step 3), the internal pressure of the annular cavity is increased, and the outer annular wall expands elastically outward until the outer annular wall abuts against the high-pressure grouting pipe. The expansion ring is fixed on the high-pressure grouting pipe so that the grouting gun is in a fixed state. In construction step 4), the internal pressure of the annular cavity is reduced, and the outer annular wall elastically contracts inward until the outer annular wall disengages from the high-pressure grouting pipe, and the grouting gun is in an active state.

8. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 7, characterized in that, In construction step 1), the outer ring wall is provided with multiple arc-shaped strips that are curved in an arc shape. The multiple arc-shaped strips are arranged around the outer ring wall at intervals in the circumference. The multiple arc-shaped strips enclose and form a discontinuously arranged deformable ring. The deformable ring is arranged at an angle to the axial direction of the grouting gun. In construction step 3), during the outward elastic expansion of the outer ring wall, multiple arc-shaped strips expand outward synchronously with the outer ring wall, and the deformable ring expands outward synchronously until the outer ring wall is fixed on the high-pressure grouting pipe, and the deformable ring supports the outer ring wall in an inclined manner. In construction step 4), during the process of the outer ring wall elastically contracting inward, multiple arc-shaped strips retract inward synchronously with the outer ring wall, and the deformed ring retracts inward synchronously until the outer ring wall detaches from the high-pressure grouting pipe.

9. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 8, characterized in that, In construction step 1), a plurality of deformable rings are formed in the outer ring wall, and the plurality of deformable rings are arranged at intervals along the axial direction of the grouting gun; the multiple deformable rings have different inclination angles from the axial direction of the grouting gun. In construction step 3), when the outer ring wall is fixed on the high-pressure grouting pipe, multiple deformable rings support the outer ring wall at multiple angles and positions.

10. The anchor cable construction method of multi-depth layered high-pressure grouting as described in claim 7, characterized in that, In construction step 3), the expansion ring has an inward ring facing the annular area. The inward ring is connected to the outer ring wall and the outer ring wall respectively. The inward ring is arranged around the circumference of the grouting gun, and the inward rings of the two expansion rings are arranged facing each other. The inner ring is provided with multiple rigid inclined ring pieces, which are arranged around the circumference of the grouting gun and nested in sequence; the inclined ring pieces are arranged inclined towards the outer ring wall in the direction from bottom to top. After the outer ring is fixed to the high-pressure grouting pipe, during the process of the grouting gun spraying grout into the annular area through the grout outlet, the grout in the annular area presses against the inclined ring plate to apply radial pressure to the outer ring wall.

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