A modular multi-segment high-strength grouting anchor pipe

Abstract

This utility model provides a modular multi-segment high-strength grouting anchor pipe, which can achieve free length adjustment and ensure uniform mixing of grout throughout the hole. It is used to further improve the reliability, adaptability and construction efficiency of anchoring projects. It includes at least two reinforced grouting anchor pipe units, a mixing centering connector connecting two adjacent reinforced grouting anchor pipe units, and a guide anchor head fixed at the end of the farthest reinforced grouting anchor pipe unit. The outer wall of the mixing centering connector is provided with a multi-segment mixing blade assembly for mixing grout and providing radial support force.

Description

Technical Field

[0001] This utility model relates to the field of anchoring, and more specifically, to a modular multi-segment high-strength grouting anchor pipe. Background Technology

[0002] In the field of geotechnical engineering anchoring, hollow grouted anchors are widely used as an important support component for the reinforcement and stabilization of slopes, tunnels, foundation pits, and other engineering projects. They consist of a hollow rod into which grout is injected. After the grout solidifies, it bonds with the rod and the surrounding soil and rock to form a solid anchor body, thus providing strong anchoring force.

[0003] Several design schemes exist in the prior art aimed at improving the strength of anchor bolts. For example, a high-strength hollow grouting anchor bolt with patent application number CN202421681177.8 uses multiple threaded ribbed steel bars welded circumferentially to the outer wall of a single hollow grouting pipe to form a composite reinforcement structure, effectively improving the overall tensile strength of the anchor bolt. This scheme utilizes a combined head and an alloy anchor head to respectively accommodate and fix the ends of the grouting pipe and the steel bars.

[0004] However, the following defects still exist during use, for example: 1. Existing technology uses a single fixed length design, which cannot flexibly adjust the length of the anchor rod according to actual engineering needs. Different lengths of rods need to be prefabricated for anchor holes of different depths, resulting in poor versatility and increased complexity of warehousing and construction management.

[0005] 2. The mixing function relies entirely on the front anchor head, and the mixing range is very limited. For long anchor rods, the grout in the middle and rear sections cannot be effectively and evenly mixed, which can easily lead to the grout body being not dense and having uneven strength, thus affecting the final anchoring quality.

[0006] 3. During the grouting process, the rod body is prone to sticking to the hole wall due to its own weight or pressure, resulting in uneven thickness of the protective layer formed after grouting, which will weaken the long-term durability of the anchor rod. Utility Model Content

[0007] The purpose of this invention is to provide a modular, multi-segment high-strength grouting anchor pipe, which can achieve free length adjustment and ensure uniform mixing of grout throughout the entire hole section, thereby further improving the reliability, adaptability, and construction efficiency of anchoring projects.

[0008] The embodiments of this utility model are implemented as follows: A modular multi-segment high-strength grouting anchor pipe includes: at least two reinforced grouting anchor pipe units, a mixing centering connector connecting adjacent reinforced grouting anchor pipe units, and a guide anchor head fixed to the end of the farthest reinforced grouting anchor pipe unit; the outer wall of the mixing centering connector is provided with a multi-segment mixing blade assembly for mixing grout and providing radial support force.

[0009] In a preferred embodiment of the present invention, the above-mentioned reinforced grouting anchor pipe unit includes a hollow grouting pipe body and multiple threaded ribbed steel bars. Multiple sets of grouting holes are spaced apart along the axial direction on the pipe wall of the grouting pipe body. Multiple threaded ribbed steel bars are welded to the outer wall of the grouting pipe body in the circumferential direction. The threaded ribbed steel bars cover the pipe wall area where no grouting hole sets are opened, and together with the grouting pipe body, they form a composite reinforcement structure.

[0010] In a preferred embodiment of the present invention, the above-mentioned stirring centering connector includes a connecting pipe body and a primary guide vane, a support vane group, a secondary guide vane, and a conical guide vane that are sequentially fixed to the outer wall of the connecting pipe body from the proximal end to the distal end; the primary guide vane and the secondary guide vane have the same rotation direction, the support vane group has the opposite rotation direction to the guide vane, and the rotation direction of the support vane group is the same as the rotation direction of the grouting anchor pipe.

[0011] In a preferred embodiment of the present invention, the above-mentioned support blade group includes three or four blades evenly distributed circumferentially, the outer diameter of which matches the diameter of the guide blade.

[0012] In a preferred embodiment of this utility model, the aforementioned conical guide vane is a conical structure formed by gradually tapered guide vanes spirally disposed on the pipe wall of the connecting pipe body, and the direction of rotation is the same as that of the first-stage / second-stage guide vanes. In a preferred embodiment of the present invention, the guide anchor head includes an anchor head body, a semi-circular truncated sphere, a cylinder, and a pointed cone connected in sequence. The lower diameter of the semi-circular truncated sphere is the same as the diameter of the anchor head body, the diameter of the cylinder is the same as the upper diameter of the semi-circular truncated sphere, and the bottom diameter of the pointed cone is the same as the diameter of the cylinder.

[0013] In a preferred embodiment of this utility model, the pointed cone is provided with helical teeth.

[0014] In a preferred embodiment of the present invention, the anchor head body and the cylinder are provided with gradually tapering guide vanes spirally disposed on the cylinder.

[0015] The beneficial effects of this utility model embodiment are: 1. The grouting anchor pipe adopts a modular design, which allows for flexible increase or decrease in the number and total length of anchor pipe units according to different geological conditions and anchoring depth requirements. It has strong versatility and avoids the inconvenience of transportation and installation of traditional single long anchor rods, reducing manufacturing and logistics costs, and making construction more flexible and efficient. 2. The grouting pipe still adopts a composite reinforced structure. The grouting pipe body and multiple threaded ribbed steel bars welded circumferentially to the outer wall work together to form a strong skeleton. The threaded ribbed steel bars not only greatly enhance the tensile, compressive and shear strength of the grouting pipe body, enabling it to withstand higher formation pressure and anchoring force, but also cover the pipe wall area without holes, compensating for the strength loss caused by opening grouting holes; 3. Adjacent reinforced grouting anchor pipe units are connected by a mixing center connector to optimize the grouting effect during the screwing process and ensure uniform thickness of the grouting body around the anchor pipe. 4. The guide anchor head is replaced with a pointed cone-shaped anchor head with spiral teeth, which has stronger drilling guidance and higher construction accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the modular multi-segment high-strength grouting anchor pipe structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the stirring centering connector structure according to an embodiment of the present invention; Icons: Reinforced grouting anchor pipe unit 1; Grouting pipe body 11; Threaded ribbed steel bar 12; Grouting hole group 13; Mixing center connector 2; Connecting pipe body 21; First through hole 211; First annular groove 212; First-stage guide vane 22; Support vane group 23; Second-stage guide vane 24; Conical guide vane 25; Guide anchor head 3; Anchor head body 31; Second slot 311; Second annular groove 321; Semi-circular spherical body 32; Cylinder 33; Gradual diameter guide vane 331; Pointed cone 34; Helical tooth 341; Split-type arc-shaped combination block 4; Block 41; Semi-circular spherical body 42. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] First Embodiment Please refer to Figure 1 and 2This embodiment provides a modular multi-segment high-strength grouting anchor pipe, including: at least two reinforced grouting anchor pipe units 1, a stirring centering connector 2 connecting two adjacent reinforced grouting anchor pipe units 1, and a guide anchor head 3 fixed to the end of the farthest reinforced grouting anchor pipe unit 1; the outer wall of the stirring centering connector 2 is provided with a multi-segment stirring blade assembly for stirring grout and providing radial support force.

[0025] The new grouting anchor pipe adopts a modular design, which can be adapted to different anchoring depth requirements. By flexibly increasing or decreasing the number of grouting anchor pipe units 1, the overall length of the grouting anchor pipe can be changed, making it more versatile.

[0026] Meanwhile, a mixing center connector 2 is also provided between the reinforced grouting anchor pipe units 1, which can effectively mix the cement slurry during the rotation grouting process, making it more uniform and preventing segregation.

[0027] The reinforced grouting anchor pipe unit 1 includes a hollow grouting pipe body 11 and multiple threaded ribbed steel bars 12. Multiple sets of grouting hole groups 13 are provided axially at intervals on the pipe wall of the grouting pipe body 11. Multiple threaded ribbed steel bars 12 are welded circumferentially to the outer wall of the grouting pipe body 11. The threaded ribbed steel bars 12 cover the pipe wall area where no grouting hole groups 13 are opened, and together with the grouting pipe body 11, they form a composite reinforcement structure.

[0028] The grouting pipe body 11 works together with multiple threaded ribbed steel bars 12 welded circumferentially to its outer wall. Compared with the previous integrated reinforced grouting anchor pipe, fewer threaded ribbed steel bars 12 need to be welded, saving costs while forming a strong skeleton. At the same time, the number of grouting hole groups 13 is greater, resulting in faster grouting efficiency. In this embodiment, the reinforced grouting anchor pipe unit 1 is provided with three groups of grouting hole groups 13 and three groups of threaded ribbed steel bars 12, distributed at intervals.

[0029] The threaded ribbed steel bars 12 not only greatly enhance the tensile, compressive, and shear strength of the grouting pipe body 11, enabling it to withstand higher formation pressure and anchoring force, but also cover the un-drilled pipe wall area, compensating for the strength loss caused by drilling grouting holes. This structure ensures that the entire anchor pipe has extremely high overall rigidity and stability under complex geological conditions, and is not easily deformed or damaged.

[0030] The mixing center connector 2 includes a connecting pipe body 21 and a primary guide vane 22, a support vane group 23, a secondary guide vane 24, and a conical guide vane 25, which are fixed to the outer wall of the connecting pipe body 21 from the proximal end to the distal end. The primary guide vane 22 and the secondary guide vane 24 have the same rotation direction, while the support vane group 23 has the opposite rotation direction to the guide vane. The rotation direction of the support vane group 23 is the same as that of the grouting anchor pipe.

[0031] Both ends of the connecting pipe body 21 are ports for connecting to the reinforced grouting anchor pipe unit 1. A first through hole 211, threadedly connected to the grouting pipe body 11, is provided at the center of each port. A first annular groove 212 for accommodating the threaded ribbed steel bar 12 is provided near the port side of the first through hole 211. After assembly, a split-type arc-shaped combination clamping block 4 can be inserted between the annular groove and the threaded ribbed steel bar 12 to further enhance the stability of the connecting pipe body 21.

[0032] The primary guide vane 22 and the secondary guide vane 24 adopt a reverse spiral design, which is opposite to the direction of rotation of the support vane group 23. When rotating, they generate an upward axial lift force to guide the sinking cement or other anchoring agent upward, thereby balancing the settlement caused by gravity and ensuring that the hole area is fully filled.

[0033] Based on the primary guide vane 22 and the secondary guide vane 24, a conical guide vane 25 was also designed. The conical guide vane 25 is a tapered structure formed by gradually tapering guide vanes spirally arranged on the pipe wall of the connecting pipe body 21. The direction of rotation is the same as that of the primary / secondary guide vanes 24, so that the guide vanes with oppositely tapering diameters form a contraction-expansion flow channel. This causes the cement fluid to experience a pressure reduction due to the expansion of the cross-section during flow, thereby reducing splashing by slowing down the flow velocity. At the same time, the diameter of the conical guide vane 25 decreases from large to small, increasing the local flow velocity through cross-sectional contraction and enhancing the scouring and filling of the hole wall by the anchoring agent.

[0034] Support blade groups 23, similar in structure to turbine blades, are arranged between the multi-stage guide vanes. During rotation, the blades contact the borehole wall, generating radial support force to eliminate the eccentric moment caused by the anchor bolt's own weight or borehole deviation. In this embodiment, the support blade group 23 includes three or four blades evenly distributed circumferentially, with an outer diameter matching the diameter of the guide vanes.

[0035] The guide anchor 3 adopts a new design, which includes an anchor body 31, a semi-circular spherical body 32, a cylinder 33 and a pointed cone 34 connected in sequence. The lower diameter of the semi-circular spherical body 32 is the same as the diameter of the anchor body 31, the diameter of the cylinder 33 is the same as the upper diameter of the semi-circular spherical body 32, and the bottom diameter of the pointed cone 34 is the same as the diameter of the cylinder 33.

[0036] Compared to previous anchor heads, the combined guide anchor head 3, with a pointed cone 34, a cylinder 33, and a frustum sphere at the tip, can effectively reduce drilling resistance, guide the anchor pipe along the predetermined trajectory, and prevent deviation from the borehole.

[0037] The end face of the anchor head body 31 is also provided with a second slot 311 that is threadedly connected to the grouting pipe body 11. A second annular groove 321 for accommodating the threaded ribbed steel bar 12 is provided near the port side of the second slot 311. After assembly, a split arc-shaped combination locking block 4 can be used to lock into the position between the second annular groove 321 and the threaded ribbed steel bar 12 to further enhance the stability of the connecting pipe body 21.

[0038] One end of the split-type arc-shaped combination clamping block 4 is provided with a clamping block 41 that matches the gap shape of the threaded ribbed steel bar 12 and the second annular groove 321, and the other end is a semi-circular truncated cone 42. After the two split-type arc-shaped combination clamping blocks 4 are spliced ​​together, they are fastened with bolts to form a truncated cone, reducing the entry of cement and other materials into the guide anchor head 3 / mixing center connector 2.

[0039] Furthermore, a spiral tooth 341 is provided on the pointed cone 34. The anchor head body 31 and the cylinder 33 are provided with a gradually tapered guide vane 331 spirally arranged on the cylinder to enhance their ability to break rocks and soil. Their spiral state can discharge the broken soil backward, improve drilling efficiency, and ensure the quality of hole formation.

[0040] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A modular, multi-segment high-strength grouting anchor pipe, characterized in that, include: The system includes at least two reinforced grouting anchor pipe units, a mixing centering connector connecting two adjacent reinforced grouting anchor pipe units, and a guide anchor head fixed to the end of the farthest reinforced grouting anchor pipe unit; the outer wall of the mixing centering connector is provided with a multi-segment mixing blade assembly for mixing slurry and providing radial support force.

2. The modular multi-segment high-strength grouting anchor pipe according to claim 1, characterized in that, The reinforced grouting anchor pipe unit includes a hollow grouting pipe body and multiple threaded ribbed steel bars. Multiple sets of grouting holes are spaced apart along the axial direction on the pipe wall of the grouting pipe body. Multiple threaded ribbed steel bars are welded to the outer wall of the grouting pipe body in the circumferential direction. The threaded ribbed steel bars cover the pipe wall area where no grouting hole sets are opened, and together with the grouting pipe body, they form a composite reinforcement structure.

3. The modular multi-segment high-strength grouting anchor pipe according to claim 1, characterized in that, The stirring centering connector includes a connecting pipe body and, from the proximal end to the distal end, a primary guide vane, a support vane group, a secondary guide vane, and a conical guide vane, which are sequentially fixed to the outer wall of the connecting pipe body. The primary guide vane and the secondary guide vane have the same rotation direction, while the support vane group has the opposite rotation direction to the guide vane. The rotation direction of the support vane group is the same as that of the grouting anchor pipe.

4. The modular multi-segment high-strength grouting anchor pipe according to claim 3, characterized in that, The support blade assembly includes three or four blades evenly distributed circumferentially, the outer diameter of which matches the diameter of the guide blades.

5. The modular multi-segment high-strength grouting anchor pipe according to claim 3, characterized in that, The conical guide vane is a tapered structure formed by gradually tapering guide vanes spirally arranged on the pipe wall of the connecting pipe body, and the direction of rotation is the same as that of the first-stage / second-stage guide vanes.

6. The modular multi-segment high-strength grouting anchor pipe according to claim 1, characterized in that, The guide anchor head includes an anchor head body, a semi-circular truncated sphere, a cylinder, and a pointed cone connected in sequence. The bottom diameter of the semi-circular truncated sphere is the same as the diameter of the anchor head body, the diameter of the cylinder is the same as the top diameter of the semi-circular truncated sphere, and the bottom diameter of the pointed cone is the same as the diameter of the cylinder.

7. The modular multi-segment high-strength grouting anchor pipe according to claim 6, characterized in that, The pointed cone is provided with helical teeth.

8. The modular multi-segment high-strength grouting anchor pipe according to claim 6, characterized in that, The anchor head body and the cylinder are provided with gradually tapering guide vanes spirally mounted on the cylinder.

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