A self-drilling grouting anchor rod

Abstract

The utility model relates to a self drilling formula grouting anchor rod, including the anchor rod body of axis extension along before and after direction, the front end threaded connection of anchor rod body has the drill bit, is provided with the grouting hole for with anchor rod body inner hole intercommunication on the drill bit, is provided with the drill bit threaded hole of realization with drill bit threaded connection in the drill bit, the front end of drill bit threaded hole is provided with the conical groove of little before big, the slot wall of grouting hole and conical groove links to each other, the anchor rod body front end articulates has at least three along the circumferential order arrangement's sectoral petal, when anchor rod body moves to the front limit position relative to drill bit, each sectoral petal splices into a conical plugging structure with conical groove adaptation. The utility model has solved the technical problem that the anchor rod is blocked in the prior art in the process that the drill bit drills into the earth, and the earth is entered into the drill bit and anchor rod through the grouting hole on the drill bit and causes.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction technology, and in particular to a self-drilling grouting anchor. Background Technology

[0002] Grouting anchors are a type of prestressed anchor, mainly used in geotechnical engineering for slope protection, foundation pit excavation, etc.

[0003] The traditional installation method for prestressed anchors involves first drilling a hole in the soil using a drilling rig. After drilling is complete, the drill rod is removed, and then the anchor (usually a hollow structure) is inserted into the hole. Subsequently, grout is injected into the hole through the hollow anchor. The grout fills the space between the anchor and the hole wall. After the grout solidifies, it tightly bonds the anchor and the surrounding soil and rock into a whole. This whole can effectively transfer the tensile and shear forces inside the soil and rock to the anchor.

[0004] Traditional anchor bolt construction requires drilling, removing the drill rod, and then inserting the anchor bolt, resulting in low overall anchoring efficiency. To address this, a self-drilling grouting anchor bolt has emerged, such as the "self-drilling grouting anchor bolt with a spiral drill bit" disclosed in Chinese patent CN220226940. This anchor bolt includes an anchor bolt body, with a drill bit at the front end of the anchor bolt body. The drill bit has a grouting hole connected to the inner hole of the anchor bolt.

[0005] In use, the anchor rod is directly connected to the drilling rig. The anchor rod rotates under the drive of the drilling rig, which in turn rotates the drill bit, thereby drilling a hole in the rock and soil. After drilling is completed, there is no need to remove the anchor rod or disconnect it from the drill bit. Grouting is then performed directly through the inner hole of the anchor rod. The grout is discharged through the grouting hole of the drill bit to the anchor rod and the support of the borehole wall, thus completing the grouting.

[0006] This new type of self-drilling grouting anchor rod uses the anchor rod itself as the drill rod, thus eliminating the step of removing the drill rod in existing technologies and improving grouting efficiency. However, since the grouting hole is located on the drill bit, during drilling, broken soil can clog the grouting hole. Broken soil can also enter the drill bit or even the anchor rod through the grouting hole, causing blockage inside the anchor rod and potentially leading to grouting failure. Utility Model Content

[0007] The purpose of this utility model is to provide a self-drilling grouting anchor bolt to solve the technical problem in the prior art where soil fragments enter the drill bit and anchor bolt through the grouting hole on the drill bit during drilling, causing anchor bolt blockage.

[0008] To solve the above-mentioned technical problems, the technical solution of the self-drilling grouting anchor bolt in this utility model is as follows:

[0009] A self-drilling grouting anchor bolt includes an anchor bolt body extending along the front-rear direction. A drill bit is threadedly connected to the front end of the anchor bolt body. The drill bit is provided with a grouting hole for communicating with the inner hole of the anchor bolt body. The drill bit is provided with a drill bit threaded hole for threaded connection with the drill bit. The front end of the drill bit threaded hole is provided with a conical groove that is smaller at the front and larger at the back. The grouting hole is connected to the groove wall of the conical groove. At least three fan-shaped petals arranged sequentially along the circumference are hinged to the front end of the anchor bolt body. When the anchor bolt body moves relative to the drill bit to the front limit position, the fan-shaped petals are assembled into a conical sealing structure that matches the conical groove.

[0010] Furthermore, there are three fan-shaped lobes, and the central angle of the larger end of each fan-shaped lobe is 120°.

[0011] Furthermore, each sector-shaped petal has a grouting position where, after the anchor rod body moves backward relative to the drill bit, it is flushed by grout to achieve communication between the grouting hole and the inner hole of the anchor rod body.

[0012] Furthermore, the front end face of the anchor bolt body is a tapered end face that is larger at the front and smaller at the back, and each fan-shaped lobe is connected to the tapered end face through a hinge structure.

[0013] The beneficial effects of this utility model are as follows: When in use, the anchor rod body has two working states relative to the drill bit. In the first working state, during drilling, the anchor rod body is continuously rotated forward relative to the drill bit until it can no longer be rotated. At this time, under the limiting action of the conical groove, each fan-shaped petal forms a conical sealing structure that matches the conical groove. That is to say, each grouting hole on the drill bit is blocked by the conical sealing structure. Therefore, during normal drilling, soil fragments will not enter the inner hole of the drill bit and the anchor rod body through the grouting holes. In the second working state, after drilling is completed, the anchor rod body is reversed and moves backward relative to the drill bit. At this time, the fan-shaped petals are no longer limited by the conical groove, and the front end of the fan-shaped petals can swing back and unfold. Grouting can be performed directly at this time. The grout flows through the gap between the fan-shaped petals and then through the grouting holes to the space between the anchor rod body and the borehole wall, and there will be no problem of soil fragments blocking the inner hole of the anchor rod body. Attached Figure Description

[0014] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding portions, wherein:

[0015] Figure 1 This is a schematic diagram of the cooperation between the anchor bolt body and the drill bit during the drilling process in this utility model;

[0016] Figure 2 yes Figure 1 Front view of the assembly of the various sector lobes;

[0017] Figure 3 This is a schematic diagram showing the interaction between the anchor bolt body and the drill bit during the grouting process.

[0018] Figure 4 It is a picture Figure 3 Front view of the assembly of the various sector lobes;

[0019] Figure 5 yes Figure 3 Enlarged view of point A;

[0020] 1. Inner hole of anchor bolt body; 2. Anchor bolt body; 3. Drill bit; 4. Fan-shaped flap; 5. Grouting hole; 6. Conical groove; 7. Hinged structure; 8. Conical end face; 9. Grout channel; 10. Drill bit threaded hole. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0022] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0023] An example of a self-drilling grouting anchor bolt in this utility model. Figures 1-5 As shown:

[0024] The anchor body 2 extends along the front-rear direction, and the front end of the anchor body 2 is threadedly connected to a drill bit 3. The rear end of the anchor body 2 is used to connect to a drilling rig. The connection between the anchor body and the drilling rig is existing technology and will not be described in detail here.

[0025] The drill bit 3 is provided with a grouting hole 5 for communicating with the inner hole 1 of the anchor body. In this embodiment, the drill bit is provided with a drill bit threaded hole 10 for threaded connection with the front end of the drill bit. The axis of the drill bit threaded hole extends in the front-rear direction. The front end of the drill bit threaded hole is provided with a tapered groove 6 that is smaller at the front and larger at the back. The tapered groove 6 is coaxial with the drill bit threaded hole 10. The grouting hole 5 is connected to the groove wall of the tapered groove 6.

[0026] The front end face of the anchor bolt body is a tapered end face 8 that is larger at the front and smaller at the back. Three fan-shaped petals 4 are connected to the tapered end face 8 by a hinge structure 7, which is arranged sequentially along the circumference of the anchor bolt body. In this embodiment, the hinge structure is a hinge structure, and the rear end of each fan-shaped petal is connected to the tapered end face 8 by a hinge.

[0027] The cross-sectional shape of the fan-shaped petals is arc-shaped. The rear end of the fan-shaped petal 4 is the large end, and the front end of the fan-shaped petal is the small end. The central angle of the large end of each fan-shaped petal is 120°.

[0028] When the anchor bolt body moves to its front limit position relative to the drill bit, each of the four sector-shaped segments assembles into a conical sealing structure that fits the conical groove. For example... Figures 1-2 As shown, the fan-shaped petals are assembled together to form a complete conical sealing structure. This conical sealing structure is adapted to the conical groove on the drill bit, so it can seal each grouting hole 5 on the conical groove.

[0029] During use, the anchor rod body rotates with the drill bit while drilling ahead. Throughout the drilling process, the grouting hole 5 is sealed by the conical sealing structure, which effectively prevents soil fragments from entering the inner hole of the drill bit and anchor rod body through the grouting hole during drilling.

[0030] After drilling into place, reverse the anchor bolt body, as follows: Figure 3 As shown, the anchor body moves backward relative to the drill bit, and the fan-shaped petals dislodge from the conical groove. Then, grouting can be performed through the inner hole 1 of the anchor body. As the grout flows forward, it pushes open the fan-shaped petals and flows through the grout channels 9 between the fan-shaped petals into the conical groove 6. Then, it flows through the grouting hole to the space between the anchor body and the drill hole, completing the anchoring process.

[0031] In this invention, by setting a fan-shaped petal at the front end of the anchor rod body, the problem of soil fragments clogging the inner hole of the anchor rod body during drilling is effectively avoided; at the same time, it can also ensure smooth grouting.

[0032] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0034] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A self-drilling grouting anchor bolt, comprising an anchor bolt body extending along its axis in a front-rear direction, a drill bit threadedly connected to the front end of the anchor bolt body, the drill bit having a grouting hole for communicating with the inner bore of the anchor bolt body, characterized in that: The drill bit has a threaded hole for connecting with the drill bit thread. The front end of the threaded hole has a tapered groove that is smaller at the front and larger at the back. The grouting hole is connected to the groove wall of the tapered groove. The front end of the anchor rod body has at least three fan-shaped petals arranged sequentially along the circumference. When the anchor rod body moves relative to the drill bit to the front limit position, the fan-shaped petals are assembled into a conical sealing structure that matches the tapered groove.

2. The self-drilling grouting anchor bolt according to claim 1, characterized in that: There are three fan-shaped lobes, and the central angle of the larger end of each fan-shaped lobe is 120°.

3. The self-drilling grouting anchor bolt according to claim 1, characterized in that: Each sector-shaped petal has a grouting position where, after the anchor rod body moves backward relative to the drill bit, it is flushed by grout to achieve communication between the grouting hole and the inner hole of the anchor rod body.

4. The self-drilling grouting anchor bolt according to any one of claims 1 to 3, characterized in that: The front end face of the anchor bolt body is a tapered end face that is larger at the front and smaller at the back, and each fan-shaped lobe is connected to the tapered end face through a hinge structure.

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