Biomimetic shearing reinforced hollow grouting anchor cable for storage and transportation in roll and method of use

Abstract

The present application relates to the field of anchor cable, in particular to a bionic shearing reinforced hollow grouting anchor cable capable of being coiled for storage and transportation and a use method thereof. The hollow grouting anchor cable comprises an anchor cable main body, the anchor cable main body comprises a grouting core tube and a steel strand wrapped outside the grouting core tube, the grouting core tube can be bent and coiled, a plurality of groups of bionic sleeve pipes are sleeved outside the anchoring section of the anchor cable main body, the bionic sleeve pipes of each group are nested with each other, the anchoring hole of the surrounding rock is a square hole, and the bionic sleeve pipes are in contact with the side wall of the anchoring hole. The grouting core tube is arranged to be capable of being bent and coiled, and the bionic sleeve pipes are sleeved outside the anchor cable main body, the bionic sleeve pipes are nested to form a hollow chain structure of the tail of a bionic rattlesnake, so that the anchor cable main body can be strengthened, the hollow grouting anchor cable of the present application can be coiled for transportation, and the main contradiction between coiled storage and transportation and shearing reinforcement is overcome; and the anchoring hole is arranged to be square, so that the anchoring effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of anchor cables, specifically to a rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable and its application method. Background Technology

[0002] With the widespread development of deep underground engineering, large deformations of surrounding rock in complex environments have seriously affected the excavation and service of underground engineering projects. Traditional support theories are constantly being improved, and anchor cable support plays an important role in the support of loose and broken surrounding rock, extremely soft rock strata, high-stress broken surrounding rock, and deep coal roadways in tunnels, mines, and underground engineering. Among them, anchor cable support involves installing anchor cables in the surrounding rock and grouting. The grout can penetrate into a large area of ​​rock mass and fissures around the borehole, forming an anchor body that binds the broken surrounding rock into a whole, improving the bearing capacity of the surrounding rock and thus greatly improving the support effect. Anchor cable support is widely used due to its characteristics of large anchoring radius, strong anchoring force, wide reinforcement range, large reinforcement depth, and higher prestress application.

[0003] Current anchoring devices include solid anchors and hollow grouting anchors. Hollow grouting anchors integrate anchoring and grouting, further enhancing load-bearing capacity. The tensile and shear strength of hollow grouting anchors plays a crucial role in anchoring stability. Some technologies use metal structures for the grouting pipe to enhance tensile and shear strength. However, anchors with metal grouting pipes cannot be rolled for transport, while those that can are relatively weak in tensile and shear strength, failing to balance transport and shear strengthening, thus affecting anchor performance. Furthermore, anchoring reliability is highly dependent on the anchoring method between the anchor and the rock strata. Traditional anchoring involves creating circular anchor holes in the rock strata, resulting in a circular anchor body. This circular anchor body lacks sufficient resistance to bending deformation, and in sedimentary rock formations, circular anchor holes are prone to issues like chipping and drill jamming during drilling, affecting hole quality and ultimately the final anchoring effect.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] In view of the shortcomings of the prior art, one of the objectives of this invention is to propose a rollable and transportable biomimetic shear-strengthened hollow grouting anchor cable to solve the problems of poor tensile and shear strength and difficulty in rollable transportation of existing hollow grouting anchor cables.

[0006] Another objective of this invention is to propose a method for using a rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable, thereby improving the anchoring form between the anchor cable and the surrounding rock and further enhancing the anchoring effect.

[0007] The biomimetic shear-strengthened hollow grouting anchor cable of the present invention, which can be rolled up and stored, adopts the following technical solution: it includes an anchor cable body, which is inserted into the anchor hole of the rock wall. The anchor cable body is divided into a free section and an anchoring section. The anchoring section is close to the bottom of the anchor hole. An isolation element is sleeved on the outside of the free section of the anchor cable body. A sealing ring is provided at the bottom of the isolation element. The anchor cable body includes a grouting core tube and steel strands wrapped around the outside of the grouting core tube. The part of the grouting core tube in the anchoring section is provided with grout outlets at intervals.

[0008] The grouting core tube can be bent and coiled. Several sets of bionic sleeves are spaced along the axial direction on the outside of the anchoring section of the anchor cable body. There are multiple sets in each set. The cross-sectional shape of the bionic sleeve perpendicular to its axis is circular and thin in the middle and thick at both ends. Multiple bionic sleeves in each set are nested together. The bionic sleeves are made of metal.

[0009] The anchoring hole is a square hole, and the bionic sleeve can contact the side of the anchoring hole.

[0010] Optionally, the bionic sleeve corresponds to the grout outlet, and a support drum is provided on the anchor cable body. The support drum is inserted into the steel strand along the radial direction of the anchor cable body, and the grouting core tube is made of plastic.

[0011] Alternatively, the support drum can be hourglass shaped.

[0012] Optionally, the grouting core tube includes a first tube and a second tube connected to each other. The first tube is in the free section and the second tube is in the anchoring section. The first tube is made of plastic. The second tube includes a reinforcing cylinder and a connecting tube connected to each other. The reinforcing cylinder and the connecting tube are arranged alternately. The reinforcing cylinder is made of metal. The connecting tube is made of the same material as the first tube. The grout outlet is located on the reinforcing cylinder and is evenly distributed along the circumference of the reinforcing cylinder. The bionic sleeve is fitted onto the connecting tube.

[0013] Optionally, the side wall of the reinforcing cylinder is provided with several circumferentially distributed support and limiting rods, which extend radially along the reinforcing cylinder and extend out of the steel strand, with the slurry outlet corresponding to the support and limiting rods.

[0014] Optionally, four support limit rods are provided and supported at the four corners of the anchor hole.

[0015] Optionally, the middle part of the reinforcing cylinder is a cylindrical cylinder, and the two sides are symmetrical conical cylinders. The large end of the conical cylinder is connected to the cylindrical cylinder. The support and limiting rod is set on the cylindrical cylinder, and the slurry outlet is opened on the side wall of the conical cylinder near the anchor hole.

[0016] Optionally, an anchor head with a tapered tip is provided at the bottom of the anchor cable body.

[0017] Optionally, the side length of the anchor hole is 6-10 mm larger than the outer diameter of the anchor cable body.

[0018] The method for using rollable and transportable biomimetic shear-reinforced hollow grouting anchor cables, specifically including the following steps:

[0019] Step 1: Excavate a tunnel at the predetermined location in the surrounding rock;

[0020] Step 2: Drill square anchor holes on the inclined rock wall of the tunnel and clean the anchor holes.

[0021] Step 3: Insert the anchor cable body into the anchor hole and perform end anchoring;

[0022] Step 4: Apply preload to the anchor cable body;

[0023] Step 5: Perform a grouting injection into the anchor hole. The grouting injection is performed under normal pressure.

[0024] Step 6: After the initial setting of the first grouting, a second grouting is performed through the grouting core tube. The second grouting is high-pressure grouting.

[0025] Step 7: After the secondary grouting has solidified, apply tension to the anchor cable body.

[0026] The beneficial effects of this invention are as follows: The biomimetic shear-strengthened hollow grouting anchor cable of this invention, which can be rolled up and stored, strengthens the anchor cable body by setting the grouting core tube to be able to be bent and coiled, and by wearing a biomimetic sleeve on the outside of the anchor cable body to enhance the tensile and shear resistance, thereby improving the anchoring strength. At the same time, because the nested biomimetic sleeve forms a hollow chain-like structure that resembles the tail of a rattlesnake, the anchor cable body can be bent within a certain angle range, thus enabling the hollow grouting anchor cable of this invention to be rolled up and transported, overcoming the main contradiction between rolled up storage and transportation and shear strengthening.

[0027] Furthermore, the main structure of the grouting core tube is designed as a bendable plastic tube, allowing the anchor cable body to be bent. This facilitates the packaging, storage, and transportation of the grouting anchor cable of this invention, improving transportation convenience. The anchoring section of the grouting core tube has a metal reinforcing cylinder, with the grout outlet located within the reinforcing cylinder. This reinforcing cylinder directly strengthens the grout outlet of the grouting core tube, further improving the tensile and shear strength of weak points in the anchor cable body. Simultaneously, a biomimetic sleeve is fitted onto the connecting pipe to provide auxiliary reinforcement to other parts of the anchor cable body. In other words, this embodiment optimizes the structure of the grouting core tube, enabling the invention to be packaged and transported while ensuring the tensile and shear strength of the anchor cable, thereby improving the reliability of the final anchoring.

[0028] Furthermore, the reinforcing cylinder is designed as a shuttle-shaped structure, with the grout outlet located on the conical inclined surface of the reinforcing cylinder, allowing the grout to be sprayed out at an angle. The resulting anchor body has a barbed structure, further improving the reliability of the anchoring.

[0029] The present invention provides a method for using a rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable. The anchoring hole is designed as a square hole. A square hole of the same size has a larger moment of inertia than a circular hole, resulting in a stronger resistance to bending deformation in the final anchor body. This further enhances the anchoring system's ability to resist bending deformation. Furthermore, when drilling in sedimentary rock formations, square holes are less prone to chipping or jamming, resulting in greater stability, easier construction, and better hole quality. Simultaneously, the biomimetic sleeve is positioned to contact the side of the anchoring hole, allowing for centering and positioning of the anchor cable, thus improving its stability during insertion and grouting.

[0030] Furthermore, the present invention employs an anchoring process of end anchoring - applying prestress - primary atmospheric pressure grouting - secondary high pressure grouting - applying tension force, thereby achieving full prestressed anchoring and improving the anchoring effect. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram illustrating the use of the biomimetic shear-strengthened hollow grouting anchor cable of the present invention, which can be rolled up and stored.

[0033] Figure 2 for Figure 1 Sectional view of AA;

[0034] Figure 3 for Figure 2 Enlarged view at point B in the middle;

[0035] Figure 4 This is a schematic diagram of the structure of a rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to an embodiment of the present invention;

[0036] Figure 5 for Figure 4 Enlarged view at point C;

[0037] Figure 6 for Figure 4 The front view;

[0038] Figure 7 for Figure 6 Enlarged view at point E in the middle;

[0039] Figure 8 for Figure 6 DD section view;

[0040] Figure 9 for Figure 1 Enlarged view at point F;

[0041] Figure 10 This is an anchoring effect diagram according to an embodiment of the present invention;

[0042] Figure 11 A schematic diagram of the structure of a rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable provided in another embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the structure of a rollable, shear-strengthened hollow grouting anchor cable provided in another embodiment of the present invention.

[0044] In the picture:

[0045] 01. Surrounding rock; 011. Anchor hole; 02. Waist beam; 03. Tensioning seat; 04. Auxiliary grouting pipe; 05. Concrete pipe;

[0046] 100. Anchor cable body; 110. Grouting core pipe; 111. First pipe; 112. Reinforcing cylinder; 1121. Support limiting rod; 1122. Grout outlet; 113. Connecting pipe; 120. Steel strand;

[0047] 200. Isolation component; 210. Sealing ring;

[0048] 300. Bionic sleeve;

[0049] 400. Anchor head;

[0050] 500. Support drum. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] like Figures 1 to 11 As shown, the biomimetic shear-strengthened hollow grouting anchor cable (hereinafter referred to as hollow grouting anchor cable) that can be rolled up and stored and transported according to the embodiments of the present invention is suitable for external anchor support system. When establishing external anchor support system, a roadway is excavated in the surrounding rock 01, and an anchoring hole 011 is opened obliquely downward in the roadway rock wall. The hollow grouting anchor cable of the present invention is inserted into the anchoring hole 011.

[0053] Specifically, it includes an anchor cable body 100, which includes a grouting core tube 110 and a steel strand 120 wrapped around the outside of the grouting core tube 110. The steel strand 120 is made of multiple strands of smooth, round prestressed steel wire. An anchor head 400 is provided at the bottom of the anchor cable body 100. The anchor head 400 has a conical tip. When the anchor cable body 100 is inserted into the anchor hole 011, the anchor head 400 can play a guiding role, which facilitates the smooth insertion of the anchor cable body 100. When the anchor cable body 100 reaches the bottom of the anchor hole 011, the conical tip of the anchor head 400 can also be inserted into the surrounding rock 01, making the positioning of the anchor cable body 100 more reliable.

[0054] The anchor cable body 100 is divided into a free section and an anchoring section. The anchoring section is located near the bottom of the anchoring hole 011. A spacer 200 is sleeved on the outside of the free section of the anchor cable body 100. A sealing ring 210 is provided at the bottom of the spacer 200. The sealing ring 210 can prevent grout from entering between the spacer 200 and the anchor cable body 100. By setting the spacer 200 and the sealing ring 210, the free section can be isolated from the grout, which facilitates the tensioning of the anchor cable body 100. In one embodiment, the spacer 200 preferably adopts a sleeve structure.

[0055] The grouting core tube 110 is provided with grout outlets 1122 at intervals in the anchoring section. The grout injected through the grouting core tube 110 can pass through the grout outlets 1122 and be injected into the anchoring hole 011 through the gaps in the steel strand 120.

[0056] When establishing an external anchoring system, after the anchor cable body 100 is inserted into the anchoring hole 011, it is end-anchored. Specifically, an auxiliary grouting pipe 04 is inserted into the anchoring hole 011, and resin-coated anchoring agent is sent to the bottom of the anchoring hole 011 through the auxiliary grouting pipe 04. The anchor cable body 100 is rotated by a drilling rig to stir the resin-coated anchoring agent to improve its uniformity. Then, it is allowed to solidify. After the resin-coated anchoring agent stabilizes, the end anchoring is completed.

[0057] Then, force transmission equipment is installed on the sidewall of the tunnel. Support piles (not shown in the figure) are set on the rock wall of the tunnel. A waist beam 02 is installed on the support piles. A tensioning seat 03 is set on the waist beam 02. Openings are set on the waist beam 02 and the tensioning seat 03. The steel anchor cable body 100 passes through the openings through the waist beam 02 and the tensioning seat 03. An anchor is installed on the tensioning seat 03. The anchor cable body 100 is tensioned by the anchor cable tensioning device (jack) to apply pre-tightening force to the anchor cable and make the anchor cable tensile.

[0058] Grouting is performed into the anchor hole 011 through the auxiliary grouting pipe 04. The first grouting uses gravity grouting to inject cement mortar. The grout reaches the bottom of the anchor hole 011 along the auxiliary grouting pipe 04 and gradually rises from the bottom of the anchor hole 011. During the grouting process, the auxiliary grouting pipe 04 is pulled outward while grouting until grout emerges from the opening of the anchor hole 011, completing the first grouting. At the same time, the auxiliary grouting pipe 04 is removed. After the first grouting is completed, wait for the grout to initially set and form the anchor body, and then perform the second grouting.

[0059] The secondary grouting adopts a high-pressure grouting method, injecting grout into the grouting core tube 110 under high pressure. Under high pressure, the grout flows out through the grout outlet 1122, splitting the anchor body of the primary grouting and entering the surrounding rock 01 along the crack. After the secondary grouting is completed, the grout fills the surrounding rock 01 around the anchor body of the primary grouting and the cracks of the anchor body of the primary grouting, and finally forms a larger diameter anchor body in the anchoring section of the anchor cable body 100, completing the fixation of the hollow grouting anchor cable in the surrounding rock 01.

[0060] Subsequently, tension is applied to the anchor cable body 100 using an anchor cable tensioning device. Because the anchoring section of the anchor cable body 100 is firmly connected to the surrounding rock 01 through grouting and mechanical locking, the reverse tension is transmitted to the pile, thereby limiting the displacement of the pile and sharing the pressure of the surrounding rock 01.

[0061] It should be further explained that multiple hollow grouting anchor cables are installed at intervals on the same side and at the same height of the rock wall. These multiple hollow grouting anchor cables pass through the same waist beam 02. As the tunnel is gradually excavated, an external anchor support system is gradually established. This external anchor support system provides reliable support, enabling stable control of the tunnel and ensuring the safety of tunnel construction. This invention employs an anchoring process of end anchoring – applying prestress – primary atmospheric pressure grouting – secondary high pressure grouting – applying tension, achieving full prestressed anchoring and improving the anchoring effect.

[0062] It is understandable that, in order to improve the strength of hollow grouting anchor cables, the grouting core tube 110 is set as a metal tube in related technologies to improve strength and increase the tensile and shear resistance of hollow grouting anchor cables. However, because the anchor cable is long, after setting the grouting core tube 110 as a metal tube, the anchor cable cannot be rolled up for transportation, making transportation extremely inconvenient.

[0063] In the embodiments provided by the present invention, the grouting core tube 110 is configured to be bent and coiled. Several sets of bionic sleeves 300 are spaced along the axial direction on the outer side of the anchoring section of the anchor cable body 100. There are multiple sets in each set. The cross-sectional shape of the bionic sleeve 300 perpendicular to its axis is circular and thinner in the middle and thicker at both ends. A single bionic sleeve 300 is similar to a gourd shape or the rattle ring of a rattlesnake's tail. Preferably, the outer diameter of its crest is 3-6 mm larger than the outer diameter of its trough, and the wall thickness is 1-3 mm. Multiple bionic sleeves 300 in each set are nested with each other. After several sets of bionic sleeves 300 are nested, a hollow chain-like structure similar to the tail of a rattlesnake is formed. The bionic sleeve 300 is made of metal, specifically carbon steel.

[0064] In this embodiment, the grouting core tube 110 is configured to be bent and coiled, and a biomimetic sleeve 300 is fitted on the outside of the anchor cable body 100 to strengthen the anchor cable body 100, thereby improving its tensile and shear resistance and thus increasing its anchoring strength. At the same time, because the biomimetic sleeve 300 is nested to form a hollow chain-like structure that resembles the tail of a rattlesnake, the anchor cable body 100 can be bent within a certain angle range, enabling the hollow grouting anchor cable of the present invention to be rolled up for transportation, thus overcoming the main contradiction between rolled storage and transportation and shear strengthening.

[0065] Furthermore, the anchor hole 011 is a square hole. It is understandable that the moment of inertia of the cross section is a key parameter for measuring the ability to resist bending deformation. The larger the value, the stronger the bending resistance.

[0066] The moment of inertia of a circular cross-section (diameter d) about its centroidal principal axis (an axis of arbitrary diameter) is: ;

[0067] The moment of inertia of a square cross-section (side length d) about its centroidal principal axis (parallel to the side) is: ;

[0068] The moment of inertia of a square is about 1.7 times that of a circle (0.0833 / 0.0491≈1.7), meaning that a square has a stronger resistance to bending.

[0069] In this embodiment, the anchoring hole 011 is set as a square hole. A square hole of the same size has a larger moment of inertia than a circular hole, resulting in a stronger resistance to bending deformation of the final anchor body. This further improves the anchoring system's ability to resist bending deformation. Moreover, when drilling in sedimentary rock formations, square holes are less prone to chipping or getting stuck, resulting in greater stability.

[0070] It should be explained that when drilling square anchor holes 011 in the rock face, Rellow drill bits can be used. Rellow drill bits achieve square hole machining through the geometric properties of the Rellow triangle. When the drill bit rotates, the three vertices of the Rellow triangle slide within the square boundary, forming an approximately square cutting path.

[0071] Furthermore, the bionic sleeve 300 can contact the side of the anchor hole 011, thereby supporting and positioning the anchor cable body 100, so that the anchor cable is always in the center position during the insertion of the anchor hole 011 and the grouting process. Moreover, because the middle diameter of the bionic sleeve 300 is small, it is conducive to the flow of grout and can fill more grout, thus improving the anchoring effect.

[0072] Furthermore, the two ends of the bionic sleeve 300 can be configured such that one end is larger than the other. During nesting, several bionic sleeves 300 are nested sequentially with their larger ends inside the smaller ends. In this nesting configuration, the larger end of the bionic sleeve 300 contacts the side of the anchoring hole 011 to position the anchor cable. Alternatively, the bionic sleeve 300 can be configured to include both a large sleeve and small sleeves, with one large sleeve fitted over two adjacent small sleeves, forming a double-layer staggered nesting. In this nesting configuration, both ends of the large sleeve are of equal size and contact the side of the anchoring hole 011 to position the anchor cable.

[0073] In one embodiment, reference is made to Figure 11 The bionic sleeve 300 corresponds to the slurry outlet 1122, and the slurry sprayed from the slurry outlet 1122 flows out through the gaps between multiple bionic sleeves 300.

[0074] In this embodiment, the bionic sleeve 300 is positioned at the grout outlet 1122. Since the grout outlet 1122 is a weak point in the anchor cable structure, local reinforcement of this weak point in the hollow grouting anchor cable improves its bending and shear resistance. Simultaneously, in this embodiment, the grouting core tube 110 is made of plastic, such as PVC / PE, which allows for bending and coiling and provides some support, facilitating the winding of the steel strand 120. Combined with the hollow chain-like structure of the bionic rattlesnake tail formed by the nested bionic sleeve 300, this strengthens the structure while facilitating roll-up transportation.

[0075] Furthermore, a support drum 500 is provided on the anchor cable body 100. The support drum 500 is inserted into the steel strand 120 along the radial direction of the anchor cable body 100, thereby opening a certain grout passage gap in the steel strand 120. The support drum 500 corresponds to the grout outlet 1122 and is set near the grout outlet 1122 to facilitate the outflow of grout.

[0076] Furthermore, the support drum 500 is hourglass-shaped, with its diameter gradually expanding from the middle to both sides. The preferred bottom diameter is 10~15mm, the height is 8~15mm, and the middle section is 5~10mm, which facilitates the positioning of the support drum 500. The support drum 500 is made of polyhexamethylene adipamide, which has good lubricity and reduces the stress concentration of the nearby steel strand 120. The crushing breaking force is equivalent to the pre-tightening force of the anchor cable, generally 200~300kN.

[0077] In another embodiment, refer to Figure 1 , Figure 4 , Figure 5 and Figure 9 The grouting core pipe 110 includes a first pipe 111 and a second pipe connected together. The first pipe 111 is in the free section and the second pipe is in the anchoring section. The first pipe 111 can be bent and can be made of plastic material, such as PVC / PE plastic pipe. It can be coiled and has a certain support capacity, which is convenient for the steel strand 120 to be wound. The second pipe includes a reinforcing cylinder 112 and a connecting pipe 113 connected together. The reinforcing cylinder 112 and the connecting pipe 113 are alternately arranged. The reinforcing cylinder 112 is made of metal and the connecting pipe 113 is made of the same material as the first pipe 111. The grout outlet 1122 is set on the reinforcing cylinder 112 and is evenly distributed along the circumference of the reinforcing cylinder 112. The bionic sleeve 300 is sleeved on the connecting pipe 113.

[0078] In this embodiment, the main structure of the grouting core tube 110 is a bendable plastic tube, allowing the anchor cable body 100 to be bent. This facilitates the packaging, storage, and transportation of the hollow grouting anchor cable of this invention, improving transportation convenience. Furthermore, the grouting core tube 110 has a metal reinforcing cylinder 112 in the anchoring section, with the grout outlet 1122 located within the reinforcing cylinder 112. The reinforcing cylinder 112 directly strengthens the grout outlet 1122 of the grouting core tube 110, further enhancing the tensile and shear strength of the weak points in the anchor cable body 100. Simultaneously, the biomimetic sleeve 300 is fitted onto the connecting pipe 113 to provide auxiliary reinforcement to other parts of the anchor cable body 100. In other words, this embodiment optimizes the structure of the grouting core tube 110, enabling both packaged transportation and ensuring the tensile and shear strength of the anchor cable, thereby improving the reliability of the final anchoring. Compared to the embodiment in which the bionic sleeve 300 is fitted onto the grout outlet 1122, the anchor cable body 100 of this embodiment has higher strength and can meet the construction requirements for greater strength support. Those skilled in the art can select a suitable solution according to their needs.

[0079] Furthermore, the side wall of the reinforcing cylinder 112 is provided with several circumferentially distributed support and limiting rods 1121. The support and limiting rods 1121 extend radially along the reinforcing cylinder 112 and extend beyond the steel strand 120. The grout outlet 1122 corresponds to the support and limiting rod 1121. The support and limiting rod 1121 causes the steel strand 120 to be stripped open at the reinforcing cylinder 112 with several grouting gaps. When grouting is injected into the grouting core tube 110, the grout can be injected between the anchor hole 011 and the anchor cable body 100 through the grout outlet 1122 and the aforementioned grouting gaps. At the same time, when the anchor cable body 100 is inserted into the anchor hole 011 of the surrounding rock 01, the support and limiting rod 1121 can be supported on the surrounding rock 01, thereby supporting and centering the anchor cable body 100. Furthermore, there are four support and limiting rods 1121, which are supported at the four corners of the anchor hole 011 to support and position the anchor cable.

[0080] Furthermore, the reinforcing cylinder 112 is spindle-shaped. Specifically, the middle part of the reinforcing cylinder 112 is a cylindrical body, and the two sides are symmetrical conical bodies. The large end of the conical body is connected to the cylindrical body, forming a spindle-shaped structure. The supporting limiting rod 1121 is set on the cylindrical body, and the grout outlet 1122 is opened on the side wall of the conical body near the opening of the anchoring hole 011. With this configuration, when grouting is performed through the grouting core tube 110, the grout is sprayed out obliquely through the grout outlet 1122, and the grouting direction forms a certain angle with the anchoring direction. This results in the final anchor body formed after the secondary grouting solidifies into a concrete pipe 05 with a barbed shape (refer to...). Figure 10 This increases the anchoring strength; at the same time, because the grout is discharged at an angle during grouting, the reaction force of the grout on the reinforcing cylinder 112 has a downward component, which makes the anchor cable body 100 tend to move downward along the anchoring hole 011, preventing the anchor cable body 100 from moving upward during grouting, making the positioning of the anchor cable body 100 in the anchoring hole 011 more reliable, and further improving the reliability of the final anchoring.

[0081] This invention also provides a method for using a rollable, shear-strengthened hollow grouting anchor cable, the method specifically including:

[0082] Step 1: Excavate a tunnel at the predetermined location 01 in the surrounding rock;

[0083] Step 2: Drill a square anchor hole 011 on the inclined rock wall of the tunnel and clean the anchor hole 011. Use a Leroy drill bit to drill the hole, and the side length of the anchor hole 011 is 6~10mm larger than the outer diameter of the anchor cable body 100. After drilling, use high pressure air to clean the soil and rock debris in the anchor hole 011.

[0084] Step 3: Insert the anchor cable body 100 into the anchor hole 011 and perform end anchoring; during insertion, the anchor head 400 provides guidance, and at the same time, the support limiting rod 1121 and / or the bionic sleeve 300 center and position the anchor cable body 100. After insertion, the resin cartridge anchoring agent is sent into the bottom of the hole using the auxiliary grouting pipe 04. Then, the anchor cable body 100 is driven to rotate by the drilling rig to stir the resin cartridge anchoring agent. After the resin cartridge anchoring agent has stabilized for about 30 minutes, the end anchoring is completed.

[0085] Step 4: Apply preload to the anchor cable body 100 using an anchor cable tensioning device;

[0086] Step 5: Perform a grouting injection into anchor hole 011. The grouting injection is performed under normal pressure. After the grout overflows from the opening of anchor hole 011, stop the grouting and wait for initial setting.

[0087] Step 6: After the initial setting of the first grouting, a second grouting is performed through the grouting core tube 110. The second grouting is high-pressure grouting, in which a set amount of grout is injected into the grouting core tube 110 at a set pressure to split the anchor body formed by the first grouting.

[0088] Step 7: After the secondary grouting has solidified, a tensioning device is used to apply tension to the anchor cable body 100 to achieve full prestressed anchoring, establish an external tension anchoring system, and complete the fixation of the pile group.

[0089] Reference Figure 12 As shown, the present invention also provides another embodiment to adapt to different construction needs, which is different from the foregoing embodiment. Figure 11 The difference in the described implementation is that the isolation element 200 uses return cotton, and the return cotton is set shorter, and the shape of the return cotton is adapted to the shape of the anchor hole 011.

[0090] The following construction process was used in this embodiment:

[0091] a. Use a Lelo drill bit to drill a square anchor hole 011 into the surrounding rock 01. After drilling, use high-pressure air to clean the rock cuttings in the anchor hole 011.

[0092] b. The resin cartridge anchoring agent is sent into the bottom of the anchor hole 011 through the grouting core tube 110. The agent is stirred for a certain period of time using a drilling rig. After the resin cartridge anchoring agent has stabilized for 30 minutes, the anchor cable tensioning device is used to apply pre-tightening force to the anchor cable.

[0093] c. Using the grouting gun of the dual-liquid grouting pump, inject the grouting anchoring agent into the hole along the grouting core tube 110. When the grouting anchoring agent overflows from the hole of the grouting core tube 110, stop grouting and wait for the grout to solidify to achieve full prestressed anchoring.

[0094] This technology is easy to implement and is suitable for reinforcing surrounding rock and improving its bearing capacity.

[0095] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable, characterized in that, The anchor cable body is inserted into the anchor hole in the rock wall. The anchor cable body is divided into a free section and an anchoring section. The anchoring section is close to the bottom of the anchor hole. An isolation element is sleeved on the outside of the free section of the anchor cable body. A sealing ring is set at the bottom of the isolation element. The anchor cable body includes a grouting core tube and steel strands wrapped around the outside of the grouting core tube. The part of the grouting core tube in the anchoring section is provided with grout outlets at intervals. The grouting core tube can be bent and coiled. Several sets of bionic sleeves are spaced along the axial direction on the outside of the anchoring section of the anchor cable body. There are multiple sets in each set. The cross-sectional shape of the bionic sleeve perpendicular to its axis is circular and thin in the middle and thick at both ends. Multiple bionic sleeves in each set are nested together. The bionic sleeves are made of metal. The anchoring hole is a square hole, and the bionic sleeve can contact the side of the anchoring hole; The grouting core tube includes a first tube and a second tube connected together. The first tube is in the free section and the second tube is in the anchoring section. The first tube is made of plastic. The second tube includes a reinforcing cylinder and a connecting tube connected together. The reinforcing cylinder and the connecting tube are arranged alternately. The reinforcing cylinder is made of metal. The connecting tube is made of the same material as the first tube. The grout outlet is located on the reinforcing cylinder and is evenly distributed along the circumference of the reinforcing cylinder. A bionic sleeve is fitted onto the connecting tube.

2. The rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to claim 1, characterized in that, The side wall of the reinforcing cylinder is provided with several circumferentially distributed support and limiting rods. The support and limiting rods extend radially along the reinforcing cylinder and extend out of the steel strand. The slurry outlet corresponds to the support and limiting rod.

3. The rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to claim 2, characterized in that, There are four support limit rods, which are supported at the four corners of the anchor hole.

4. The rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to claim 2, characterized in that, The middle part of the reinforcing cylinder is a cylindrical body, and the two sides are symmetrical conical bodies. The large end of the conical body is connected to the cylindrical body. The support and limiting rod is set on the cylindrical body, and the slurry outlet is opened on the side wall of the conical body near the anchor hole.

5. The rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to claim 1, characterized in that, An anchor head with a conical tip is provided at the bottom of the anchor cable body.

6. The rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to claim 1, characterized in that, The side length of the anchor hole is 6~10mm longer than the outer diameter of the anchor cable body.

7. A method for using rollable, shear-strengthened hollow grouting anchor cables, characterized in that: The use of the rollable, transportable, biomimetic shear-strengthened hollow grouting anchor cable according to any one of claims 1-6 specifically includes the following steps: Step 1: Excavate a tunnel at the predetermined location in the surrounding rock; Step 2: Drill square anchor holes on the inclined rock wall of the tunnel and clean the anchor holes. Step 3: Insert the anchor cable body into the anchor hole and perform end anchoring; Step 4: Apply preload to the anchor cable body; Step 5: Perform a grouting injection into the anchor hole. The grouting injection is performed under normal pressure. Step 6: After the initial setting of the first grouting, a second grouting is performed through the grouting core tube. The second grouting is high-pressure grouting. Step 7: After the secondary grouting has solidified, apply tension to the anchor cable body.

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