N variable-diameter conical anchor cables capable of being locally arranged on soft rock
By designing an anchor cable with a conical anchor structure embedded in soft rock, the problem of insufficient bearing capacity of traditional anchor cables in soft rocks is solved, and higher anchoring force and long-term stability are achieved.
Patent Information
- Application Number
- CN202510447244.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2025-06-06
AI Technical Summary
Traditional anchor cables are insufficient in soft rock projects, and they are prone to relaxation and damage after long-term use, resulting in poor support effect.
A conical anchor cable with N larger diameters can be installed in soft rocks. A conical anchor structure is arranged on the steel strands embedded in the soft rock structure. The anchor structure consists of a steel bar bracket and a grouting body. The steel bar bracket is placed on the steel strands. The grouting body is coaxial with the steel strands and is conical. The steel bar bracket is cast and wrapped, and the small diameter end faces outside the soft rock body.
By changing the structural form of the anchor section, the anchoring performance of the anchor cable in soft rock is improved, making the anchoring force 2-5 times that of the traditional anchor cable, enhancing the support effect, reducing the possibility of slack, and ensuring long-term stability and safety.
Smart Images
Figure CN120099951A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of geotechnical engineering support and reinforcement, and in particular to a conical anchor cable with N enlarged diameters which can be installed locally in soft rocks. Background Art
[0002] In today's society, with the continuous development of the economy and the continuous growth of construction needs, infrastructure construction occupies a key position in the national development strategy. The scale of resource development, railways, roads and tunnels has expanded year by year, injecting strong impetus into social development. In these engineering constructions, anchor reinforcement technology has become a common means in the field of geotechnical engineering support due to its significant advantages such as small disturbance to the original rock, good stability, convenient construction, economic and safe, and is widely used in the reinforcement of tunnels, slopes, foundation pits and other projects.
[0003] However, the anchoring force and long-term reliability of existing anchor cables are the core indicators for measuring their support effects. However, traditional anchor cables mainly rely on the side friction of the anchoring section to bear the reinforcement load. Traditional anchor cables mainly rely on the side friction of the anchoring section as the anchoring force. For soft rock projects, there are often problems such as insufficient bearing capacity and relaxation and damage after long-term action. The side friction will gradually weaken, causing the bearing capacity of the anchor cable to decrease. In addition, the tensile strength, diameter, material of the anchor cable itself, the strength characteristics of the anchoring material, the bonding strength, the length of the anchoring section, and the physical and mechanical properties of the surrounding rock will affect the bearing capacity of the anchor cable. Especially under geological conditions such as soft rock and sandstone, the problem of insufficient anchoring force is more prominent, which seriously restricts the safety and stability of geotechnical engineering.
[0004] Therefore, the present application proposes a method in which N conical anchor cables with enlarged diameters can be installed locally in soft rock to solve the above-mentioned technical problems. Summary of the invention
[0005] The purpose of the present invention is to provide a conical anchor cable with variable diameter that can be installed in local soft rock. Through innovative structural design and working principle, the anchoring force can be effectively improved, and the support effect under complex geological conditions such as soft rock can be enhanced, thereby solving many problems faced by existing anchor cable technology in practical applications and providing more reliable safety guarantees for various geotechnical engineering projects.
[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a conical anchor cable with a variable diameter that can be installed in a soft rock part, comprising a steel strand embedded in a soft rock structure, a conical anchor structure is arranged on the steel strand, and the anchor structure is embedded in the soft rock structure;
[0007] The anchoring structure comprises a steel bar support arranged on the steel strand, the steel bar support and the poured concrete slurry form a conical grouting body, the grouting body is embedded in the soft rock structure, and the small diameter end of the grouting body faces outside the soft rock body;
[0008] The steel bar support includes a first fixing component and a second fixing component coaxially arranged on the steel strand, a plurality of supporting steel bars are obliquely arranged between the first fixing component and the second fixing component, and the grouting body is wrapped around the first fixing component, the second fixing component and the supporting steel bars.
[0009] Preferably, the first fixing assembly includes a first limiting anchor cable locked and fixed on the steel strand, the first limiting anchor cable is provided with a first bearing plate, and the end of the supporting steel bar is rotatably connected to the first bearing plate.
[0010] Preferably, the second fixing assembly includes a second limiting anchor cable locked and fixed on the steel strand, the second limiting anchor cable is provided with a second bearing plate, and one end of the supporting steel bar away from the first bearing plate is rotatably connected to the second bearing plate.
[0011] Preferably, the distance between the first limiting anchor cable and the outlet end of the soft rock structure is greater than the distance between the second limiting anchor cable and the outlet end of the soft rock structure.
[0012] Preferably, a plurality of connecting steel bars corresponding to the supporting steel bars are rotatably arranged on the first bearing plate, and one end of the connecting steel bar away from the first bearing plate is rotatably connected to the end of the supporting steel bar.
[0013] Preferably, the deflection angle of the connecting steel bar on the second bearing plate is not greater than 90°, and the maximum deflection is perpendicular to the second bearing plate.
[0014] Preferably, a limiting block for limiting the angle of the connecting steel bars is provided on the second bearing plate.
[0015] Preferably, an anchor hole is opened on the soft rock structure, and an enlarged hole corresponding to the grouting body is arranged at the bottom of the anchor hole, and the grouting body is cast on site in the enlarged hole, and the hypotenuse of the grouting body abuts against the side wall of the enlarged hole.
[0016] Preferably, before construction, the first limiting anchor cable is locked and fixed on the steel strand, the second limiting anchor cable is slidably connected to the steel strand, and the supporting steel bars and the connecting steel bars are arranged parallel to the steel strand.
[0017] Preferably, during construction, the steel bar support is sent into the enlarged hole, and then the second limiting anchor cable is pushed to move toward the first limiting anchor cable, so that the connecting steel bar is perpendicular to the first bearing plate, and the supporting steel bar is obliquely supported between the connecting steel bar and the second bearing plate.
[0018] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a conical anchor cable with variable diameter that can be installed locally in soft rock, which is mainly used for soft rock reinforcement; its core structure includes a steel strand embedded in the soft rock structure, and a conical anchor structure is arranged on the steel strand; the anchor structure consists of a steel support and a grouting body, the steel support is sleeved on the steel strand, and includes a first fixing component and a second fixing component arranged coaxially, and a number of supporting steel bars are arranged obliquely between the two; the grouting body is coaxial with the steel strand and is conical, and is cast and wrapped around the steel support, with the small diameter end facing the outside of the soft rock body and embedded in the soft rock structure; the conical anchor structure changes the force-bearing mode of the traditional anchor cable that simply relies on lateral friction resistance. The soft rock is subjected to the extrusion force of the cone surface, and its vertical component provides pull-out resistance, and the horizontal force compacts the surrounding rock, thereby increasing the compressive strength of the surrounding rock. As the pull-out force increases, the surrounding rock strength is further enhanced, thereby improving the pull-out resistance, making the anchoring force 2-5 times that of traditional anchor cables, effectively solving the problem of insufficient bearing capacity of traditional anchor cables in soft rock projects; the first fixing component, the second fixing component and the supporting steel bars of the steel support together form a stable frame structure, which enhances the overall stability of the anchor structure. The grouting body wraps the steel support so that the various parts work together, reducing the possibility of loosening of the anchor cable during long-term use, and ensuring the long-term stability and safety of the soft rock reinforcement project.
[0019] The invention has a simple structure and is easy to use. By changing the structural form of the anchoring section, the anchoring performance of the anchor cable in soft rock is effectively improved, the safety is improved, and the construction efficiency is improved, thus providing an efficient and reliable solution for engineering anchoring in soft rock areas. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0021] Figure 1 This is a schematic diagram of a structure in which N conical anchor cables with increasing diameters can be installed in a local area of soft rock according to the present invention;
[0022] Figure 2 It is a schematic diagram of the anchoring structure of the present invention;
[0023] Figure 3 For the present invention Figure 2 A partial enlarged view of middle A;
[0024] Figure 4 For the present invention Figure 2 A partial enlarged view of middle C;
[0025] In the figure: 1. Steel strand; 2. Anchoring structure; 3. Soft rock structure; 11. Positioning hole; 12. Positioning block; 13. Positioning spring; 21. Steel bar support; 22. Grouting body; 211. First fixing assembly; 212. Second fixing assembly; 213. Supporting steel bar; 2111. First limiting anchor cable; 2112. First bearing plate; 2121. Second limiting anchor cable; 2122. Second bearing plate; 2123. Connecting steel bar; 2124. Positioning block; 31. Anchoring hole; 32. Enlarged hole. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] Reference Figure 1-Figure 4 As shown, this embodiment provides a conical anchor cable with a variable diameter that can be installed in a soft rock part, including a steel strand 1 embedded in a soft rock structure 3, a conical anchor structure 2 is arranged on the steel strand 1, and the anchor structure 2 is embedded in the soft rock structure 3;
[0029] The anchoring structure 2 includes a steel bar support 21 arranged on the steel strand 1, the steel bar support 21 is cast and wrapped with a conical grouting body 22 arranged coaxially with the steel strand 1, the grouting body 22 is embedded in the soft rock structure 3, and the small diameter end of the grouting body 22 faces outside the soft rock body;
[0030] The steel bar support 21 includes a first fixing component 211 and a second fixing component 212 coaxially arranged on the steel strand 1, and a plurality of supporting steel bars 213 are obliquely arranged between the first fixing component 211 and the second fixing component 212, and the grouting body 22 is wrapped around the first fixing component 211, the second fixing component 212 and the supporting steel bars 213.
[0031] The present invention discloses a conical anchor cable with N variable diameters that can be installed locally in soft rock, and is mainly used for reinforcing soft rock. Its core structure includes a steel strand 1 embedded in a soft rock structure 3, and a conical anchoring structure is arranged on the steel strand 1; the anchoring structure is composed of a steel bar support 21 and a grouting body 22, and the steel bar support 21 is sleeved on the steel strand 1, and includes a first fixing component 211 and a second fixing component 212 that are coaxially arranged, and a number of supporting steel bars 213 are arranged obliquely between the two; the grouting body 22 is coaxial with the steel strand 1 and is conical, and is cast and wrapped around the steel bar support 21, with the small diameter end facing the outside of the soft rock body and embedded in the soft rock structure 3; the conical anchoring structure changes the force-bearing mode of the traditional anchor cable that simply relies on lateral friction resistance. The soft rock is subjected to the extrusion force of the cone surface, and its vertical component provides pull-out resistance, and the horizontal force compacts the surrounding rock, thereby increasing the compressive strength of the surrounding rock. As the pull-out force increases, the surrounding rock strength is further enhanced, thereby improving the pull-out resistance, making the anchoring force 2-55 times that of the traditional anchor cable, effectively solving the problem of insufficient bearing capacity of the traditional anchor cable in soft rock engineering; the first fixing component 211, the second fixing component 212 and the supporting steel bar 213 of the steel bar bracket 21 together form a stable frame structure, which enhances the overall stability of the anchor structure, and the grouting body 22 wraps the steel bar bracket 21, so that each part works together, reducing the possibility of the anchor cable becoming loose during long-term use, and ensuring the long-term stability and safety of the soft rock reinforcement project. The present invention has a simple structure and is easy to use. By changing the structural form of the anchoring section, the anchoring performance of the anchor cable in the soft rock structure 3 is effectively improved, the safety is improved, and the construction efficiency is improved, providing an efficient and reliable solution for engineering anchoring in soft rock areas.
[0032] Further optimization scheme, the first fixing assembly 211 includes a first limit anchor cable 2111 locked and fixed on the steel strand 1, a first bearing plate 2112 is arranged on the first limit anchor cable 2111, and the end of the support steel bar 213 is rotatably connected to the first bearing plate 2112. The first fixing assembly 211 is composed of the first limit anchor cable 2111 locked on the steel strand 1 and the first bearing plate 2112 thereon, and the end of the support steel bar 213 is rotatably connected to the first bearing plate 2112; during installation, the first limit anchor cable 2111 is first locked on the steel strand 1, and the first bearing plate 2112 is installed, so that the steel strand 1 and the first bearing plate 2112 can be locked and connected together; then the support steel bar 213 is rotatably connected to the first bearing plate 2112 by bolts, so that the support steel bar 213 can flexibly adjust the angle, which is convenient for installation and adapting to different working conditions.
[0033] Further optimization scheme, the second fixing assembly 212 includes a second limiting anchor cable 2121 locked and fixed on the steel strand 1, a second bearing plate 2122 is arranged on the second limiting anchor cable 2121, and the end of the support steel bar 213 away from the first bearing plate 2112 is rotatably connected to the second bearing plate 2122. The second fixing assembly 212 is composed of the second limiting anchor cable 2121 locked on the steel strand 1 and the second bearing plate 2122 thereon, and the end of the support steel bar 213 is rotatably connected to the second bearing plate 2122; during installation, the second limiting anchor cable 2121 is first locked on the steel strand 1, and the second bearing plate 2122 is installed, so that the steel strand 1 and the second bearing plate 2122 can be locked and connected together; then the support steel bar 213 is rotatably connected to the second bearing plate 2122 by bolts, so that the support steel bar 213 can flexibly adjust the angle, which is convenient for installation and adapting to different working conditions.
[0034] Further optimization scheme, the distance between the first limit anchor cable 2111 and the outlet end of the soft rock structure 3 is greater than the distance between the second limit anchor cable 2121 and the outlet end of the soft rock structure 3. The distance between the first limit anchor cable 2111 and the outlet end of the soft rock structure 3 is greater than the distance between the second limit anchor cable 2121 and the outlet end, forming a reasonable spatial layout, so that the conical casting body formed by casting is arranged along the anchor hole 31, so that the anchor structure is more evenly stressed in the soft rock structure 3, and the anchoring effect is improved.
[0035] Further optimization scheme, a plurality of connecting steel bars 2123 corresponding to the supporting steel bars 213 are rotatably arranged on the first bearing plate 2112, and one end of the connecting steel bar 2123 away from the first bearing plate 2112 is rotatably connected to the end of the supporting steel bar 213. The first bearing plate 2112 has connecting steel bars 2123 corresponding to the supporting steel bars 213, one end of the connecting steel bar 2123 is rotatably connected to the first bearing plate 2112 by bolts, and the other end is rotatably connected to the end of the supporting steel bar 213 by bolts, so that the angles of the supporting steel bars 213 and the connecting steel bars 2123 are adjustable, increasing the flexibility and adjustability of the structure, being able to better adapt to the complex environment of soft rock, and enhancing the adaptability of the structure.
[0036] Further optimization scheme, the deflection angle of the connecting steel bar 2123 on the second bearing plate 2122 is not greater than 90°, and the maximum deflection is perpendicular to the second bearing plate 2122; the second bearing plate 2122 is provided with a limit block 2124 for limiting the angle of the connecting steel bar 2123. The deflection angle of the connecting steel bar 2123 on the second bearing plate 2122 is not greater than 90°, and the maximum deflection is perpendicular to the second bearing plate 2122. The angle is limited to ensure structural stability and reliability, and to avoid excessive deformation affecting the anchoring effect; the limit block 2124 is provided at the connection position between the connecting steel bar 2123 and the second bearing plate 2122, and is used to limit the angle of the connecting steel bar 2123, so that when the steel bar bracket 21 is unfolded, the connecting steel bar 2123 is in a horizontal state, forming a triangular support structure with the supporting steel bar 213, ensuring structural stability, and improving construction quality and anchoring performance.
[0037] Further optimization scheme, anchor hole 31 is opened on soft rock structure 3, and enlarged hole 32 corresponding to grouting body 22 is set at the bottom of anchor hole 31, and grouting body 22 is cast on site in enlarged hole 32, and the hypotenuse of grouting body 22 abuts against the side wall of enlarged hole 32. An anchor hole 31 and enlarged hole 32 at the bottom of anchor hole 31 are opened in soft rock structure 3 at the anchoring position. When in use, anchor hole 31 and enlarged hole 32 are first drilled in soft rock, and steel support 21 is put in, so that steel support 21 enters into enlarged hole 32, and then concrete is poured in enlarged hole 32 to form conical grouting body 22, and the hypotenuse of grouting body 22 abuts against the side wall of enlarged hole 32, so as to increase the contact area and friction between grouting body 22 and soft rock and improve anchoring force; on-site casting makes grouting body 22 better combined with soft rock.
[0038] Further optimization scheme, before construction, the first limit anchor cable 2111 is locked and fixed on the steel strand 1, the second limit anchor cable 2121 is slidably connected to the steel strand 1, and the support steel bar 213 and the connecting steel bar 2123 are arranged parallel to the steel strand 1. Before construction, the first limit anchor cable 2111 is locked on the steel strand 1, and the second limit anchor cable 2121 is slidably connected to the steel strand 1, and the distance between the first limit anchor cable 2111 and the second limit anchor cable 2121 is increased, so that the support steel bar 213 and the connecting steel bar 2123 are parallel to the steel strand 1, which is convenient for sending the steel bar bracket 21 as a whole into the anchor hole 31 and the enlarged hole 32, thereby improving construction efficiency and facilitating subsequent operations.
[0039] To further optimize the solution, during construction, the steel bar support 21 is sent into the enlarged hole 32, and then the second limit anchor cable 2121 is pushed to move toward the first limit anchor cable 2111, so that the connecting steel bar 2123 is perpendicular to the first bearing plate 2112, and the supporting steel bar 213 is tilted and supported between the connecting steel bar 2123 and the second bearing plate 2122. During construction, the steel bar support 21 is sent into the enlarged hole 32, and the second limit anchor cable 2121 is pushed to move toward the first limit anchor cable 2111, so that the connecting steel bar 2123 is perpendicular to the first bearing plate 2112, and the supporting steel bar 213 is tilted and supported, and the conical steel bar support 21 is unfolded in the enlarged hole 32 to adapt to the shape of the enlarged hole 32, forming a stable anchoring structure, improving the anchoring force and stability, and then pouring concrete in the enlarged hole 32 to form a conical casting body to wrap the steel bar support 21 to form a whole.
[0040] In one embodiment of the present application, referring to the attached Figure 4 As shown, the outer wall of the steel strand 1 is provided with a plurality of positioning holes 11 arranged in an annular shape, and a positioning block 12 is slidably connected in the positioning hole 11. The side of the positioning block 12 facing the outside of the soft rock structure 3 is provided with an inclined slope, and the side facing the inside of the soft rock structure 3 is a horizontal structure. The positioning block 12 is elastically retracted in the positioning hole 11 by a positioning spring 13; when not subjected to external force, the positioning spring 13 pushes the positioning block 12 out of the positioning hole 11; when installing, the second fixing component 212 moves toward the first fixing component 211, and the second limit anchor cable 2121 first contacts the positioning block The inclined surface of 12 pushes the positioning block 12 to retract into the positioning hole 11, compressing the positioning spring 13, so that the second limit anchor cable 2121 and the second bearing plate 2122 pass through, until the end face of the second bearing plate 2122 passes over the positioning hole 11, and the second bearing plate 2122 loses the squeezing of the positioning block 12, and the positioning spring 13 resets to pop out the positioning block 12, and the horizontal surface of the positioning block 12 is against the end face of the second bearing plate 2122 to jam the second bearing plate 2122 to prevent the second bearing plate 2122 from rebounding, thereby facilitating the formation of the steel bar bracket 21 required by the present application.
[0041] In one embodiment of the present application, the bearing capacity calculation theory of N conical anchor cables with enlarged diameters that can be installed in the soft rock of the present application is determined by the following formula:
[0042] T=T 1 +T 2
[0043] Where: T is the bearing capacity of the conical anchor cable, T 1 is the lateral friction resistance of the steel strand 1; T 2 is the lateral friction of the anchoring structure.
[0044] at the same time,
[0045] T 1 =2πr1 L 1 τ 1
[0046] In the formula, r 1 is the radius of the steel strand 1, L 1 is the effective anchorage length of the steel strand 1, τ 1 is the lateral friction between the steel strand 1 and the soft rock structure 3, which is equivalent to the shear strength of the column surface, and its expression is τ 1 =P i1 tanφ+c,P i1 is the normal stress on the side of steel strand 1.
[0047] Secondly,
[0048] T 2 =π(R 2 -r 2 )σ+(R+r)1τ s / 2
[0049] In the formula, τ s is the friction force between the steel strand 1 and the soft rock structure 3, and its expression is: τ s =P i2 tanφ+c.
[0050] Among them, P i2 is the surface normal stress of the grouting body 22;
[0051] is the internal friction angle between the grouting body 22 and the soft rock structure 3;
[0052] σ is the compressive strength of soft rock;
[0053] R is the bottom diameter of the grouting body 22;
[0054] c- is the cohesion between concrete and soft rock structure 3.
[0055] Solution summary:
[0056] The patent of this invention changes the structural form of the anchoring section, and compared with the traditional anchor cable, the anchoring force is greater, the long-term stability is more reliable, and it is safer. It is mainly used in the reinforcement of mining, various slopes, tunnels and dams, underground projects, and deep foundation pit support projects. This anchoring structure firstly expands the hole diameter in a part of the conventional anchoring hole 31 through a hole expansion device, and then installs the expanded cone to form an expanded hole 32; since its diameter is much larger than the borehole diameter, for soft rock, by increasing the pull-out force, the soft rock structure 3 is subjected to the vertical positive pressure of the surface of the expanded cone, and the positive pressure can be decomposed into a vertical component force parallel to the steel strand 1, namely the pull-out force, and a horizontal force directly compacting the soft rock structure 3, thereby increasing the compressive strength of the soft rock structure 3; and as the pull-out force increases, the horizontal component stress on the soft rock structure 3 increases, thereby further enhancing the strength of the soft rock structure 3 and also increasing the pull-out force; its working principle is similar to that of a triaxial test, and the greater the confining pressure, the greater the ability to withstand the maximum principal stress, thereby changing the bearing capacity of the soft rock structure 3 and ensuring that the reinforcement project is safer. The height of the cone is then determined based on the strength of the rock and the design pull-out resistance value; when the rock is weak, the height of the cone is appropriately increased, and the bearing capacity of the anchor cable will increase; when the rock is strong, the height of the cone is determined according to the design value, and then the material and quantity of the reinforcement, that is, the strength of the grouting body 22, is determined according to the bearing capacity, thereby ensuring the safety and reliability of its support. After specific simulation and verification, the anchoring force of the conical anchor cable in this embodiment is 2-5 times that of the traditional anchor cable, and the force is more uniform.
[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0058] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A method for installing N conical anchor cables with increasing diameters in a soft rock area, characterized in that: It comprises a steel strand (1) embedded in a soft rock structure (3), a conical anchoring structure (2) is arranged on the steel strand (1), and the anchoring structure (2) is embedded in the soft rock structure (3); The anchoring structure (2) comprises a steel bar support (21) arranged on the steel strand (1), the steel bar support (21) and the poured concrete slurry form a conical grouting body (22), the grouting body (22) is embedded in the soft rock structure (3), and the small diameter end of the grouting body (22) faces outside the soft rock body; The steel bar support (21) comprises a first fixing component (211) and a second fixing component (212) coaxially arranged on the steel strand (1), a plurality of supporting steel bars (213) are obliquely arranged between the first fixing component (211) and the second fixing component (212), and the grouting body (22) is wrapped around the first fixing component (211), the second fixing component (212) and the supporting steel bars (213).
2. According to claim 1, N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: The first fixing assembly (211) comprises a first limiting anchor cable (2111) which is locked and fixed on the steel strand (1); a first bearing plate (2112) is provided on the first limiting anchor cable (2111); and an end of the supporting steel bar (213) is rotatably connected to the first bearing plate (2112).
3. The soft rock local area according to claim 2 can be equipped with N conical anchor cables with enlarged diameters, characterized in that: The second fixing assembly (212) comprises a second limiting anchor cable (2121) locked and fixed on the steel strand (1), a second bearing plate (2122) being provided on the second limiting anchor cable (2121), and an end of the supporting steel bar (213) away from the first bearing plate (2112) being rotatably connected to the second bearing plate (2122).
4. The soft rock local area according to claim 3 can be equipped with N conical anchor cables with enlarged diameters, characterized in that: The distance between the first position-limiting anchor cable (2111) and the outlet end of the soft rock structure (3) is greater than the distance between the second position-limiting anchor cable (2121) and the outlet end of the soft rock structure (3).
5. According to claim 3, N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: A plurality of connecting steel bars (2123) corresponding to the supporting steel bars (213) are rotatably arranged on the first bearing plate (2112), and one end of the connecting steel bars (2123) away from the first bearing plate (2112) is rotatably connected to the end of the supporting steel bars (213).
6. The method of claim 5, wherein N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: The deflection angle of the connecting steel bar (2123) on the second bearing plate (2122) is not greater than 90°, and the maximum deflection is perpendicular to the second bearing plate (2122).
7. The method of claim 6, wherein N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: The second bearing plate (2122) is provided with a limiting block (2124) for limiting the angle of the connecting steel bar (2123).
8. The method of claim 5, wherein N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: An anchor hole (31) is provided on the soft rock structure (3), and an enlarged hole (32) corresponding to the grouting body (22) is provided at the bottom end of the anchor hole (31); the grouting body (22) is cast on site in the enlarged hole (32), and the hypotenuse of the grouting body (22) abuts against the side wall of the enlarged hole (32).
9. The method of claim 8 wherein N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: Before construction, the first limiting anchor cable (2111) is locked and fixed on the steel strand (1), the second limiting anchor cable (2121) is slidably connected to the steel strand (1), and the supporting steel bars (213) and the connecting steel bars (2123) are arranged parallel to the steel strand (1).
10. The method of claim 9 wherein N conical anchor cables with enlarged diameters can be installed locally in soft rock, characterized in that: During construction, the steel bar support (21) is inserted into the enlarged hole (32), and then the second limiting anchor cable (2121) is pushed to move toward the first limiting anchor cable (2111), so that the connecting steel bar (2123) is perpendicular to the first bearing plate (2112), and the supporting steel bar (213) is obliquely supported between the connecting steel bar (2123) and the second bearing plate (2122).