MICP grouting anchor

Abstract

The utility model relates to an MICP grouting anchor. By optimizing the structural design, efficient injection and uniform distribution of the microbial liquid and the cementing liquid are realized. The liquid inlet part is designed to be conveniently connected with a grouting machine, and smooth input of materials is ensured; the connecting part enhances the structural stability, supports multi-point grouting, and improves the reinforcing efficiency; the grouting part of the insertion part is combined with the conical tip, and the permeation through holes are supplemented, so that slurry permeation and soil combination are effectively promoted, and the anchoring effect is enhanced. The MICP grouting anchor is small in size and simple and efficient in overall design, the construction efficiency is improved, and the stability and durability of an anchoring structure are remarkably enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of biological grouting, and more specifically relates to a MICP grouting anchor Background Technique

[0002] The technology of spraying ecological substrate with net hanging refers to an ecological restoration technology that uses an automatic hanging and spraying machine to spray an ecological substrate formed by mixing plant seeds, fertilizers, water retention agents, etc. onto the slope to be greened with a net laid, and after later maintenance and management, the vegetation seeds germinate and grow to form a relatively dense vegetation community. The technology of spraying ecological substrate with net hanging has the advantages of simple operation, wide coverage area, low economic cost, etc., and is widely used in the field of slope ecological restoration. However, after spraying ecological substrate with net hanging on the bare slope with loose soil, the surface soil of the slope is prone to softening under the action of rainfall infiltration, and under continuous action, the sprayed substrate and the softened loose soil on the slope surface will be washed away with the runoff, seriously affecting the effect of ecological restoration

[0003] In recent years, microbial mineralization technology has shown remarkable effects in improving the stability of soil slopes, has high engineering application value, and has received extensive attention in the geotechnical engineering field. Among them, the research on microbial solidification technology based on the urea hydrolysis mechanism has developed rapidly, and the MICP grouting reinforcement technology has been developed and applied. The MICP grouting reinforcement technology injects mineralized bacterial liquid and cementing liquid into the soil. The urease secreted by the mineralized bacteria hydrolyzes urea into ammonium ions (NH4 + ) and carbonate ions (CO3 2- ), which combine with free calcium ions (Ca 2+ ) in the soil to generate calcium carbonate crystals (CaCO3), enhance the connection between soil particles, improve the strength of the soil, reduce the permeability and porosity, so as to achieve the purpose of strengthening the soil. The MICP grouting technology has technical advantages such as small disturbance to the formation, good reinforcement effect, adjustable reaction rate, and environmental friendliness, and is considered an effective new method for ecological and economic reinforcement of slopes

[0004] In the existing technology of spraying ecological substrate with net hanging, net hanging bolts are often used for slope net hanging. However, the consumption of net hanging bolts is large and grouting reinforcement is required, the operation is complicated, and there is a problem of high construction cost. The existing MICP grouting technology performs slope mineralization reinforcement by arranging grouting ducts on the slope surface and then injecting mineralized bacterial liquid and cementing liquid into the formation through a high-pressure grouting machine. After completion, the ducts need to be disassembled, the construction process is relatively complicated, and microbial grouting has characteristics such as large slurry fluidity and long grouting duration, and there is a lack of a portable grouting structure matching it Summary of the Utility Model

[0005] In view of the above technical problems, the present utility model provides a MICP grouting anchor bolt, aiming to endow it with the dual functions of firmly hanging a mesh and carrying out MICP grouting and solidifying and reinforcing the surface soil of the slope. At the same time, the installation method of the MICP grouting anchor bolt is simple, facilitating grouting operation, and there is no need to disassemble after grouting, which can greatly simplify the processes of hanging the mesh and solidifying the slope surface.

[0006] To achieve the above object, in a first aspect, the present utility model provides a MICP grouting anchor bolt, comprising:

[0007] A liquid inlet part, a connecting part and an inserting part, wherein,

[0008] The liquid inlet part is used for connecting the infusion pipe of the grouting machine to input the microbial liquid and the cementing liquid;

[0009] The inserting part is vertically communicated with the liquid inlet part and extends along the direction of grouting inflow;

[0010] The connecting part is communicated with two or more of the relatively parallel inserting parts and two or more of the liquid inlet parts, and is perpendicular to the vertical plane formed by the inserting part and the liquid inlet part;

[0011] The liquid inlet part includes a grouting port and a slurry inlet hole, and is used for connecting the infusion pipe led out by the grouting machine to input the microbial liquid and the cementing liquid into the inserting part;

[0012] The inserting part sequentially includes a grouting part and a taper tip connected to each other along the direction of increasing distance from the liquid inlet part. A penetration through hole is provided at a position of the grouting part close to the taper tip.

[0013] In some embodiments, an external thread is provided at one end of the grouting part close to the liquid inlet part. In a more preferred embodiment, such an external thread is a steel wall thread structure to enhance the friction performance between the slope soil and the MICP grouting anchor bolt, and improve the firmness and structural stability of the MICP grouting anchor bolt for reinforcing the hanging mesh.

[0014] In some embodiments, the outer side wall at one end of the grouting part close to the taper tip is smooth. Such a design reduces the resistance during the process of pressing the MICP grouting anchor bolt into the slope soil, and at the same time can accelerate the smooth penetration of the microbial liquid and the cementing liquid into the soil, improving the penetration efficiency and anchoring quality.

[0015] In some embodiments, the inner diameter of the grouting port is larger than the inner diameter of the slurry inlet hole. Such a setting effectively reduces the pressure drop during grouting, ensures that the microbial liquid and the cementing liquid can enter the interior of the MICP grouting anchor bolt more quickly and smoothly, improves the grouting efficiency and uniformity, and lays a solid foundation for the reinforcement effect.

[0016] In some embodiments, the inner diameter of the insertion part is less than or equal to the inner diameter of the grout inlet hole. In these embodiments, it is ensured that the grout can be fully and evenly distributed to the distal end of the MICP grouting anchor and fully penetrate into the soil during the grouting process, reducing the loss and accumulation of the grout during the flow process, and improving the grouting efficiency and reinforcement quality.

[0017] In some embodiments, the number of the penetration through-holes is more than 1, the inner diameter is 1-2 mm, and the distance between the centers of every two penetration through-holes is 1-1.5 cm. The large number, moderate inner diameter and uniform distribution of the penetration through-holes significantly enhance the penetration ability and coverage range of the grouting liquid, ensuring that the grout is in full contact with and tightly combined with the surrounding soil, thereby improving the anchoring effect and structural stability. Such a design carefully considers the grouting efficiency and reinforcement quality, providing a strong guarantee for project safety.

[0018] In some further improved embodiments, the number of the penetration through-holes opened in a transverse section of the grouting part is more than 2. Since the horizontal permeability of the soil mass is greater than the vertical permeability, such a setting makes the curing effect of horizontal grouting more uniform, thus better taking into account the grouting efficiency and reinforcement quality.

[0019] In some embodiments, the connecting part is one of the shapes of "─", "┴" or "┼". Such a rich design greatly improves the structural diversity and adaptability of the anchor. Different-shaped connecting parts meet specific construction requirements, enhance the bonding force between the anchor and the soil mass, and improve the stability and bearing capacity of the overall structure. When the connecting part is of the "─" shape, the whole MICP grouting anchor presents a shape similar to "Π", which is suitable for softer hanging net materials; when the connecting part is of the "┴" or "┼" shape, the MICP grouting anchor can reinforce hanging net materials in more than two directions. Therefore, it is more suitable for relatively hard hanging net materials. Different MICP grouting anchors can be flexibly selected according to different construction scenarios and the hanging net materials used, providing a reliable solution for projects under complex geological conditions.

[0020] In some embodiments, the inner diameter of the grout inlet hole is 6-8 mm, and the length of the insertion part is 30-45 cm. The optimized setting of the inner diameter of the grout inlet hole and the length of the insertion part ensures the high efficiency of the grouting operation and the depth of the anchor. A smaller inner diameter can prevent the grout from flowing too fast in the pipeline and reduce the pressure loss. It is suitable for grouts with high fluidity such as microbial liquid and cementitious liquid. The appropriate inner diameter promotes the smooth injection of the grout, while the reasonable length ensures the stable anchoring of the anchor in the soil. The two work together to effectively improve the anchoring effect and structural stability.

[0021] In some embodiments, the MICP grouting anchor bolt further includes a cover body, which is adapted to the grouting port. The MICP grouting anchor bolt is designed with an additional cover body that fits tightly with the grouting port, effectively preventing the leakage of the grout after grouting is completed, maintaining the pressure inside the grouting anchor bolt. At the same time, the cover body also has the functions of dust prevention and waterproofing.

[0022] Different from the prior art, the MICP grouting anchor bolt provided by the above technical solution realizes the efficient injection and uniform distribution of microbial liquid and cementing liquid through optimized structural design. Its liquid inlet part is designed to facilitate the connection of the grouting machine to ensure the smooth input of materials; the connection part enhances the structural stability, supports multi-point grouting, and improves the reinforcement efficiency; the grouting part of the insertion part is combined with the taper tip, supplemented by permeation through-holes, effectively promoting the penetration of the grout and its combination with the soil, and enhancing the anchoring effect. This MICP grouting anchor bolt is small in size and the overall design is simple and efficient, which not only improves the construction efficiency but also significantly enhances the stability and durability of the anchoring structure.

[0023] The above relevant descriptions of the utility model content are only an overview of the technical solutions of this application. In order to enable those of ordinary skill in the art to more clearly understand the technical solutions of this application, and then to be implemented according to the content recorded in the description and the drawings, and in order to make the above objects, other objects, features and advantages of this application more easily understood, the following will be described in conjunction with the specific embodiments and drawings of this application. Brief Description of the Drawings

[0024] The drawings are only used to illustrate the principles, implementation methods, applications, features and effects of the specific embodiments and other related contents of this application, and should not be considered as a limitation to this application.

[0025] In the accompanying drawings of the specification:

[0026] Figure 1 It is a schematic structural diagram of a MICP grouting anchor bolt provided for Embodiment 1;

[0027] Figure 2 It is a top view schematic diagram of the MICP grouting anchor bolt for Embodiment 1;

[0028] Figure 3 It is a top view schematic diagram of the MICP grouting anchor bolt in another specific embodiment;

[0029] Figure 4 It is a top view schematic diagram of the MICP grouting anchor bolt in other specific embodiments;

[0030] Figure 5 It is a schematic structural diagram of the MICP grouting anchor bolt in other specific embodiments;

[0031] Figure 6 It is a usage state diagram of a MICP grouting anchor bolt provided by the present utility model.

[0032] The reference numerals in the above-mentioned drawings are explained as follows:

[0033] 1. Liquid inlet part; 11. Grouting port; 12. Slurry inlet hole;

[0034] 2. Connection part;

[0035] 3. Insertion part; 31. Grouting part; 311. External thread; 3122. Penetration through-hole; 32. Tapered tip;

[0036] 4. Cover body. Detailed implementation manners

[0037] To describe in detail the possible application scenarios, technical principles, specific implementable solutions, achievable purposes and effects of the present application, etc., the following is described in detail with reference to the specific examples listed and in conjunction with the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0038] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present application.

[0040] In the description of the present application, the phrase "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.

[0041] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary or secondary, or order relationship between these entities or operations.

[0042] Without further limitation, in this application, the terms "including", "comprising", "having" or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method or product that includes the said elements. Thus, a process, method or product that includes a series of elements may include not only those defined elements, but also other elements not expressly listed, or elements inherent to such process, method or product.

[0043] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood not to include the recited number; expressions such as "above", "below", "within" are understood to include the recited number. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically defined.

[0044] In the description of the embodiments of this application, the spatially related terms used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or drawing. This is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of this application.

[0045] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, the said "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0046] Please refer to Figure 1-2, the MICP grouting anchor provided in this embodiment includes a liquid inlet part 1, a connecting part 2, and an insertion part 3. Among them, the liquid inlet part 1 is used to connect the infusion pipe of the grouting machine to input the microbial solution and the cementing solution; the insertion part 3 is vertically connected to the liquid inlet part 1 and extends along the direction of grouting flow; the connecting part 2 is connected to two or more insertion parts and two or more liquid inlet parts 1 arranged relatively parallelly, and is perpendicular to the vertical plane formed by the insertion part 3 and the liquid inlet part 1; the liquid inlet part 1 includes a grouting port 11 and a slurry inlet hole 12. The grouting port 11 is located at the top of the anchor and is in the shape of a hollow funnel. The outer edge of the hollow funnel is larger than the tube body of the U-shaped MICP grouting anchor, that is, the inner diameter of the grouting port is larger than the inner diameter of the slurry inlet hole, and it is used to connect the infusion pipe of the grouting machine; the slurry inlet hole 12 is a hole in the center of the hollow funnel, and its size is the same as that of the tube body of the U-shaped MICP grouting anchor, and it is used for the microbial solution and the cementing solution to enter, and is used to connect the infusion pipe led out by the grouting machine to input the microbial solution and the cementing solution into the insertion part 3; the insertion part 3 successively includes a grouting part 31 and a taper tip 32 along the direction from small to large of the distance from the liquid inlet part 1. A penetration through hole 3122 is provided at a position where the grouting part 31 is close to the taper tip 32.

[0047] The above-mentioned MICP grouting anchor is vertically connected by a through tube cavity from the grouting port downwards until the taper tip. The taper tip can be a conical tip, a triangular pyramid tip, a quadrangular pyramid tip, etc. with the top facing downwards, which are multi-pyramid tips that are easy to press into the mesh material. The connecting part 2 is a hollow smooth steel pipe structure, which is used to connect the liquid inlet part 1 and the insertion part 3 to maintain the overall structural stability. The insertion part 3 is used to penetrate into the soil body to ensure the fitting and stability of the mesh and the slope surface. At the same time, MICP grouting reinforcement can be carried out to improve the stability of the surface soil layer of the slope and reduce the permeability of the soil body. The MICP grouting anchor does not need to be disassembled and adopts a pressing method, which is easy to penetrate into the soil body, making the installation work more convenient and fast, and is conducive to on-site installation.

[0048] After the microbial mineralization solution and the cementing solution enter from the liquid inlet part 1, they flow along the tube cavity into the insertion part. Under the action of the grouting pressure, the microbial solution and the cementing solution flow out from the penetration through hole 3122 and are injected into the soil body. Since the lateral permeability of the soil body is greater than the longitudinal permeability, the curing effect of lateral grouting is more uniform.

[0049] Please refer to Figure 3 , in some improved embodiments, an external thread 311 is provided at one end of the grouting part 31 close to the liquid inlet part 1. More preferably, it is a steel wall external thread structure, which can further enhance the friction performance between the soil body and the MICP grouting anchor and improve the firmness of the anchor to reinforce the mesh.

[0050] In the above two specific embodiments, the outer side walls of one end of the grouting part 31 close to the cone tip 32 are both smooth, which can reduce the resistance during the process of pressing the MICP grouting anchor into the slope soil, and at the same time can accelerate the smooth penetration of the microbial liquid and the cementing liquid into the soil, improving the penetration efficiency and the anchoring quality.

[0051] In some embodiments, the inner diameter of the insertion part is less than or equal to the inner diameter of the slurry inlet hole. This can ensure that the slurry can be fully and evenly distributed to the distal end of the MICP grouting anchor and fully penetrate into the soil during the grouting process, reducing the loss and accumulation of the slurry during the flow process, and improving the grouting efficiency and the reinforcement quality.

[0052] The number of the penetration through holes is more than 1, the inner diameter is 1-2 mm, and the distance between the centers of every two penetration through holes is 1-1.5 cm. The large number of penetration through holes, the moderate inner diameter and the uniform distribution significantly enhance the penetration ability and the coverage range of the grouting liquid, ensuring that the slurry is in full contact with and tightly combined with the surrounding soil, thereby improving the anchoring effect and the structural stability.

[0053] The number of the penetration through holes opened in a transverse section of the grouting part is more than 2. Since the horizontal permeability of the soil is greater than the vertical permeability, such a setting makes the solidification effect of the horizontal grouting more uniform, thus better taking into account the grouting efficiency and the reinforcement quality.

[0054] In some embodiments, the MICP grouting anchor further includes a cover body 4, and the cover body 4 is adapted to the grouting port. The MICP grouting anchor is provided with a cover body design, which is closely adapted to the grouting port, effectively preventing the slurry from leaking after the grouting is completed, maintaining the pressure inside the grouting anchor, and being dustproof and waterproof.

[0055] Please refer to Figure 2 、 Figure 4 、 Figure 5 . The connecting part can be in the shape of "─" ( Figure 2) One of the "┴" type or "┼" type. Such rich designs greatly enhance the structural diversity and adaptability of the anchor bolts. The connecting parts of different shapes meet specific construction requirements, enhance the bonding force between the anchor bolts and the soil, and improve the stability and bearing capacity of the overall structure. When the connecting part is of the "─" type, the overall shape of the MICP grouting anchor bolt is similar to the shape of "Π", which is suitable for softer mesh materials; when the connecting part is of the "┴" type or "┼" type, the MICP grouting anchor bolt can reinforce the mesh materials in more than two directions. Therefore, it is more suitable for relatively rigid mesh materials. Different MICP grouting anchor bolts can be flexibly selected according to different construction scenarios and the mesh materials used. In the shallow mineralization step, the number of grouting times is not less than 3 times. The pressures and times for different grouting times are different. The pressure for the first grouting is 0.2 - 0.3 MPa, and the grouting time is 5 - 10 min. The pressure for the second grouting is 0.3 - 0.5 MPa, and the grouting time is 10 - 15 min. The pressure for the third grouting is 0.5 - 1.0 MPa, and the grouting time is 15 - 30 min. The specific range depends on the soil type and engineering requirements. Different soil layer types and topographies need to adjust the grouting pressure and time to ensure effective grouting and consolidation effects. The invention and use of this MICP grouting anchor bolt provide a reliable solution for projects under complex geological conditions.

[0056] Please refer to Figure 6 the shown usage state of the MICP grouting anchor bolt of the present utility model. After cleaning the slope surface, lay the geogrid mats from top to bottom. Adjacent two rolls of geogrid mats are respectively connected and fixed with U-shaped MICP grouting anchor bolts with an insertion part length of 30 - 45 cm and resin gaskets. At least 10 cm of overlap is required at the intersection of the two meshes to obtain a meshed slope;

[0057] Surface microbial mineralization: Use a spray gun to first spray the Sporosarcina pasteurii bacterial solution on the surface of the meshed slope. After 6 h, spray the 0.25 mol / L cementing solution. Repeat the above alternating spraying 3 times to obtain a surface spraying calcified layer with a thickness of 10 cm;

[0058] Shallow microbial mineralization: Use a grouting machine with controllable grouting pressure and grouting time to inject the Sporosarcina pasteurii bacterial solution into the U-shaped MICP grouting anchor bolts through multiple grouting connecting pipes. After 6 h, inject the 0.5 mol / L cementing solution. Repeat the above alternating grouting 3 times to obtain a shallow liquid diffusion layer with a mineralization thickness of 28 cm;

[0059] Deep geotechnical body anchoring: For the unstable parts of the slope geotechnical body, drive the system anchor bolts 6 with a length of 2 m and inject cement slurry to form a grouted body to anchor the unstable geotechnical body to obtain a deep grouting reinforcement layer;

[0060] Greening substrate spraying and maintenance: Use a soil spraying machine to spray the mineralized greening substrate slurry onto the surface calcified layer of the slope surface once until the geogrid is completely covered. The thickness of the sprayed greening substrate is 2 cm to form a greening substrate layer, and then non-woven fabric is attached for maintenance. During the maintenance period, water is appropriately sprayed according to the moisture condition of the slope surface.

[0061] By using MICP grouting anchor bolts, a multi-level slope reinforcement structure of geogrid + microbial solidified surface calcified layer + U-shaped MICP grouting anchor bolt shallow liquid diffusion layer is well realized, which solves the problem that the adhesion between the greening substrate of the slope and the surface soil layer is poor and is prone to interface separation under the action of surface runoff, resulting in the peeling of the substrate layer.

[0062] In summary, the MICP grouting anchor bolt provided by the present utility model realizes the efficient injection and uniform distribution of microbial liquid and cementing liquid through optimized structural design. The design of its liquid inlet part is convenient for connecting the grouting machine to ensure the smooth input of materials; the connecting part enhances the structural stability, supports multi-point grouting, and improves the reinforcement efficiency; the grouting part of the insertion part is combined with the taper tip, supplemented by penetration through holes, which effectively promotes the penetration of the slurry and the combination with the soil, and enhances the anchoring effect. The MICP grouting anchor bolt is small in volume, and the overall design is simple and efficient. It not only improves the construction efficiency, but also significantly enhances the stability and durability of the anchoring structure. The installation method is simple, which is convenient for grouting operation. After grouting, it does not need to be disassembled, which can greatly simplify the geogrid and slope surface solidification processes, and optimize the construction and performance of the slope anti-scour greening substrate.

[0063] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of this application, the patent protection scope of this application cannot be limited thereby. Any technical solutions obtained by equivalent structural or equivalent process substitution or modification based on the essential concept of this application and using the content recorded in the text and drawings of the specification of this application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of this application.

Claims

1. A MICP grouting anchor bolt, characterized in that, Comprising: A liquid inlet part (1), a connecting part (2) and an insertion part (3), wherein The liquid inlet part (1) is used for connecting the infusion pipe of the grouting machine to input the microbial bacterial liquid and the cementing liquid; The insertion part (3) is vertically connected to the liquid inlet part (1) and extends along the grouting inflow direction; The connecting part (2) is connected to two or more of the relatively parallelly arranged insertion parts (3) and two or more of the liquid inlet parts (1), and is perpendicular to the vertical plane formed by the insertion part (3) and the liquid inlet part (1); The liquid inlet part (1) includes a grouting port (11) and a slurry inlet hole (12), and is used for connecting the infusion pipe led out by the grouting machine to input the microbial bacterial liquid and the cementing liquid into the insertion part (3); The insertion part (3) sequentially includes a grouting part (31) and a conical tip (32) connected to each other along the direction from small to large of the distance from the liquid inlet part (1), and a penetration through hole (3122) is arranged at a position of the grouting part (31) close to the conical tip (32).

2. The MICP grouting anchor bolt according to claim 1, wherein, An external thread (311) is arranged at one end of the grouting part (31) close to the liquid inlet part (1).

3. The MICP grouting anchor bolt according to claim 1, characterized in that The outer side wall of one end of the grouting part (31) close to the conical tip (32) is smooth.

4. The MICP grouting anchor bolt according to claim 1, wherein The inner diameter of the grouting port (11) is larger than the inner diameter of the slurry inlet hole (12).

5. The MICP grouting anchor bolt according to claim 1, characterized in that, The inner diameter of the insertion part (3) is less than or equal to the inner diameter of the slurry inlet hole (12).

6. The MICP grouting anchor bolt according to claim 1, wherein The number of the penetration through holes (3122) is more than 1, the inner diameter is 1-2 mm, and the distance between the centers of every two penetration through holes (3122) is 1-1.5 cm.

7. The MICP grouting anchor bolt according to claim 6, wherein The number of the penetration through holes (3122) arranged in a transverse section of the grouting part (31) is more than 2.

8. The MICP grouting anchor bolt according to claim 1, wherein, The connecting part (2) is one of a "─” shape, a "┴” shape or a "┼” shape.

9. The MICP grouting anchor bolt according to claim 1, characterized in that, The inner diameter of the slurry inlet hole (12) is 6-8 mm, and the length of the insertion part (3) is 30-45 cm.

10. The MICP grouting anchor bolt according to claim 1, characterized in that, It further includes a cover body (4), and the cover body (4) is adapted to the grouting port (11).

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