Jet grouting anchor cable construction drill bit

Abstract

This utility model discloses a rotary jet grouting anchor cable construction drill bit, including a drill bit body, with a drill rod connected to the upper end of the drill bit body. The drill bit body has a cavity for filling with high-pressure water, air, or cement grout. It also includes a ball bearing limiting device, which rotates with the drill bit body. An anchor cable disc is fitted onto the drill bit body and limited by the ball bearing limiting device. A wear-resistant protrusion is also included; the lower end of the drill bit body forms a spherical transition mounting surface with an embedding groove on this mounting surface, into which the wear-resistant protrusion is embedded, with a portion of the wear-resistant protrusion exposed outside the embedding groove. A high-pressure nozzle is also included; a stepped groove is machined on the surface of the drill bit body between the mounting surface and the ball bearing limiting device, and a mounting hole communicating with the cavity is machined at the bottom of the stepped groove. This product integrates drilling, reaming, simultaneous lowering of the anchor cable disc, and rotary jet grouting into one unit.

Description

Technical Field

[0001] This utility model relates to a drill bit for jet grouting anchor cable construction. Background Technology

[0002] In geotechnical engineering anchoring construction, jet grouting anchor cable technology is widely used due to its combination of the advantages of high-pressure jet grouting and anchor cable technology. However, existing jet grouting anchor cable construction drill bits and processes still have many shortcomings. First, traditional drill bits have a single function, and drilling, lowering the anchor cable disc (centering frame), and grouting operations often need to be carried out in separate steps, which is cumbersome and inefficient. Second, when synchronously bringing the anchor cable disc into the hole, simple mechanical pushing or welding methods are often used. The sliding friction between the drill bit and the anchor cable disc leads to high rotational resistance and high torque requirements, which not only aggravates the wear of the drill bit, but may even cause the anchor cable disc to twist or be damaged in severe cases, affecting construction quality and safety.

[0003] Based on the above problems, we designed a jet grouting anchor construction drill bit that can integrate drilling, hole enlargement, simultaneous lowering of anchor cable discs and jet grouting into one unit. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a jet grouting anchor construction drill bit that can integrate drilling, hole enlargement, simultaneous lowering of anchor cable discs and jet grouting into one unit.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A jet grouting anchor cable construction drill bit includes a drill bit body, with a drill rod connected to the upper end of the drill bit body. The drill bit body has a cavity inside for filling with high-pressure water, air, or cement slurry. It also includes...

[0007] A ball bearing limiting device, wherein the ball bearing limiting device rotates with the drill bit body, and the installed anchor cable disc is fitted onto the drill bit body and limited by the ball bearing limiting device;

[0008] The wear-resistant bump has a spherical transition at the lower end of the drill bit body to form a mounting surface. An embedding groove is provided on the mounting surface, and the wear-resistant bump is embedded in the embedding groove. A portion of the wear-resistant bump is exposed outside the embedding groove.

[0009] The high-pressure nozzle has a stepped groove machined on the surface of the drill bit body, located between the mounting surface and the ball bearing limiting device. A mounting hole communicating with the cavity is machined at the bottom of the stepped groove. The high-pressure nozzle is installed through the mounting hole. After installation, the outer end face of the high-pressure nozzle is sunk into the stepped groove.

[0010] Preferably, the end of the wear-resistant protrusion exposed outside the embedding groove is spherical or cylindrical.

[0011] Preferably, the ball bearing limiting device includes a thickened portion, the lower part of which is machined with a tapered guide surface for guiding the installation of the anchor cable disc. A fixed disc is coaxially disposed on the outside of the thickened portion, and a movable disc is detachably installed through the fixed disc. A ball bearing is sandwiched between the fixed disc and the movable disc, and the ball bearing protrudes to the outside of the movable disc. The lower end of the thickened portion passes through the anchor cable disc and contacts the upper surface of the anchor cable disc through the ball bearing.

[0012] Preferably, the thickened portion and the drill bit body are integrally formed by turning.

[0013] Preferably, a guide plate is formed at the bottom of the tapered guide surface, and the guide plate slopes downward to transition to the mounting surface.

[0014] Preferably, a plurality of spherical grooves are distributed in a ring at the bottom of the fixed disk, and the ball bearings are assembled in the spherical grooves. The top of the movable disk is machined with stepped holes corresponding to the spherical grooves. A portion of the ball bearings extends to the outside of the movable disk through the stepped holes. A plurality of screws are arranged in a ring at the upper end of the movable disk, and the screws penetrate upward through the fixed disk and are fitted with nuts.

[0015] Preferably, a protruding ring is machined at the bottom of the fixed plate, located on the outer side of the spherical groove. The protruding ring is coaxial with the stepped hole and is inserted into the stepped hole.

[0016] Preferably, a cleaning hole penetrating the spherical groove is provided on the top of the fixed plate.

[0017] 1. The beneficial effects of this utility model are: highly integrated functions and doubled construction efficiency: This product, through its unique structural design, integrates three major functions—high-pressure jet grouting for hole enlargement, simultaneous anchor cable disc implantation, and high-pressure grouting consolidation—onto a single drill bit, achieving "one drill for multiple uses." It can complete drilling, anchor cable disc placement, and grouting operations in one go, completely changing the cumbersome process of traditional step-by-step construction, greatly improving construction efficiency, and shortening the construction period.

[0018] 2. Significantly Reduced Friction and Stable, Reliable Operation: The core innovation of this product lies in its use of a ball bearing limiting device. This device utilizes rolling friction between the balls and the upper surface of the anchor cable disc, completely replacing traditional sliding friction. This significantly reduces rotational resistance (torque) during drill bit propulsion, resulting in smoother operation and effectively preventing problems such as anchor cable disc twisting, damage, or drill rod jamming caused by excessive torque, thus ensuring construction quality and equipment safety.

[0019] 3. Modular design of key components, extremely low maintenance cost: As a wear part, the ball bearing is clamped by a detachable movable disc and a fixed disc structure. After wear, it can be quickly opened and replaced, making operation simple.

[0020] 4. Easy to clean: The cleaning holes designed on the ball limit device allow for rinsing with a high-pressure water gun during construction breaks or after the project is completed. This effectively removes mud and debris that have invaded the area around the balls, preventing them from getting stuck and failing, and ensuring the long-term reliable operation of the rolling mechanism. It is especially suitable for construction in strata with high mud and sand content. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is the front view of the present invention;

[0023] Figure 2 This is the front view of the product when assembled with the anchor cable disc;

[0024] Figure 3 This is a side view of the product when it is used with the anchor cable disc;

[0025] Figure 4 for Figure 1 Sectional view at point A in the middle. Detailed Implementation

[0026] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0027] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0028] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. 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.

[0029] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] See Figures 1 to 4 The drill bit shown is for jet grouting anchor cable construction, including a drill bit body 1 (made of high-strength alloy steel), with a drill rod connected to the upper end of the drill bit body 1. The drill bit body 1 has a cavity inside for filling with high-pressure water, air, or cement slurry. The cavity has a smooth, streamlined design to reduce fluid resistance and ensure delivery efficiency. It also includes...

[0032] The ball bearing limiting device 2 rotates with the drill bit body 1, and the installed anchor cable disc 3 is fitted onto the drill bit body 1 and limited by the ball bearing limiting device 2.

[0033] The wear-resistant bump 4 is formed by a spherical transition at the lower end of the drill bit body 1 to form a mounting surface 101. An embedding groove is provided on the mounting surface 101. The wear-resistant bump 4 is embedded in the embedding groove, and a portion of the wear-resistant bump 4 (made of hard alloy, such as tungsten steel) is exposed outside the embedding groove. The wear-resistant bump 4 is installed by an interference fit.

[0034] The high-pressure nozzle 5 has a stepped groove 102 machined on the surface of the drill bit body 1 at a position between the mounting surface 101 and the ball bearing limiting device 2. A mounting hole communicating with the cavity is machined at the bottom of the stepped groove 102. The high-pressure nozzle 5 is installed through the mounting hole (the installation method is threaded connection). After installation, the outer end face of the high-pressure nozzle 5 is sunk into the stepped groove 102.

[0035] In the above technical solution, when the drill bit body 1 drills into the ground, it rotates and expands the hole through the high-pressure nozzle 5 to form a grouting hole with a diameter larger than that of the drill bit body 1. When the drill bit body 1 rotates and drills, it simultaneously pushes the anchor cable disc 3 into the anchor hole.

[0036] When the anchor plate 3 reaches the embedment depth, the cement grout is fed into the drill bit body 1 through the drill rod and sprayed out in a rotating manner through the high-pressure nozzle 5. While spraying out the cement grout, the drill rod is raised at a uniform speed to complete the rotary grouting.

[0037] The drill bit body 1 automatically separates from the anchor cable disc 3 as it retracts outward.

[0038] The specially designed ball bearing limiting device 2 reduces the friction area when in contact with the anchor cable disc 3, thereby reducing the rotational resistance of the drill bit body 1.

[0039] See Figure 3 As shown, the end of the wear-resistant protrusion 4 exposed outside the embedding groove is spherical or cylindrical.

[0040] In this embodiment, the exposed end of the wear-resistant bump 4 is spherical.

[0041] The choice between spherical or cylindrical shapes depends on the actual construction needs.

[0042] See Figure 3 and Figure 4 As shown, the ball bearing limiting device 2 includes a thickened part 21. The lower part of the thickened part 21 is machined with a tapered guide surface 22 for guiding the installation of the anchor cable disc 3. A fixed disc 23 is coaxially arranged on the outside of the thickened part 21. A movable disc 24 is detachably installed through the fixed disc 23. A ball bearing 25 is sandwiched between the fixed disc 23 and the movable disc 24. The ball bearing 25 protrudes to the outside of the movable disc 24. The lower end of the thickened part 21 passes through the anchor cable disc 3 and contacts the upper surface of the anchor cable disc 3 through the ball bearing 25.

[0043] In the above technical solution, a fixed disk 23 and a movable disk 24 are used to clamp the ball bearing 25.

[0044] After the ball bearing 25 wears out, the movable disc 24 can be removed and the ball bearing 25 can be replaced.

[0045] The thickened part 21 and the drill bit body 1 are integrally formed by turning.

[0046] Compared to welding, machining a single piece of material results in higher overall material integrity.

[0047] See Figure 3 As shown, a guide plate 221 is machined at the bottom of the tapered guide surface 22, and the guide plate 221 slopes downward to transition to the mounting surface 101.

[0048] The guide plate 221 can guide the installation of the anchor plate 3.

[0049] See Figure 4As shown, a plurality of spherical grooves 231 are distributed in a ring at the bottom of the fixed disk 23. The ball bearing 25 is assembled in the spherical groove 231. The top of the movable disk 24 is machined with a stepped hole 241 corresponding to the spherical groove 231. Part of the ball bearing 25 extends to the outside of the movable disk 24 after passing through the stepped hole 241. A plurality of screws 242 are arranged in a ring at the upper end of the movable disk 24. The screws 242 penetrate upward through the fixed disk 23 and are fitted with nuts 243.

[0050] In the above technical solution, the ball bearing 25 can be positioned by the spherical groove 231. Considering the sand and dust during the drilling process, as well as the frictional thermal expansion of the ball bearing 25, a clearance fit is adopted.

[0051] To replace ball bearing 25, simply remove nut 243 and then remove movable plate 24 to replace the ball bearing.

[0052] See Figure 4 As shown, a protruding ring 232 is machined at the bottom of the fixed plate 23, located on the outside of the spherical groove 231. The protruding ring 232 is coaxial with the stepped hole 241 and is inserted into the stepped hole 241.

[0053] The insertion of the convex ring 232 into the stepped hole 241 can increase the positioning accuracy of the movable plate 24 and the fixed plate 23.

[0054] See Figure 4 As shown, a cleaning hole 233 is provided on the top of the fixed plate 23, which penetrates the spherical groove 231.

[0055] After construction is completed, the ball bearings 25 can be cleaned by flushing them into the spherical groove 231 through the cleaning hole 233 using a high-pressure water gun.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0061] 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 jet grouting anchor construction drill bit, comprising a drill bit body (1), the upper end of which is connected to a drill rod, the drill bit body (1) having an internal cavity for filling with high-pressure water, air, or cement slurry, characterized in that: It also includes, The ball limiting device (2) rotates with the drill bit body (1), and the installed anchor cable disc (3) is fitted onto the drill bit body (1) and limited by the ball limiting device (2). The wear-resistant protrusion (4) has a spherical transition at the lower end of the drill bit body (1) to form a mounting surface (101). An embedding groove is provided on the mounting surface (101). The wear-resistant protrusion (4) is embedded in the embedding groove, and a portion of the wear-resistant protrusion (4) is exposed outside the embedding groove. The high-pressure nozzle (5) has a stepped groove (102) machined on the surface of the drill bit body (1) at a position between the mounting surface (101) and the ball bearing limiting device (2). A mounting hole communicating with the cavity is machined at the bottom of the stepped groove (102). The high-pressure nozzle (5) is installed through the mounting hole. After installation, the outer end face of the high-pressure nozzle (5) sinks into the stepped groove (102).

2. The jetting anchor construction drill bit of claim 1, wherein: The end of the wear-resistant bump (4) exposed outside the embedding groove is spherical or cylindrical.

3. The jetting anchor construction drill bit of claim 1, wherein: The ball bearing limiting device (2) includes a thickened part (21). The lower part of the thickened part (21) is machined with a tapered guide surface (22) for guiding the installation of the anchor cable disc (3). A fixed disc (23) is coaxially arranged on the outside of the thickened part (21). A movable disc (24) is detachably installed through the fixed disc (23). A ball bearing (25) is sandwiched between the fixed disc (23) and the movable disc (24). The ball bearing (25) protrudes to the outside of the movable disc (24). The lower end of the thickened part (21) passes through the anchor cable disc (3) and contacts the upper surface of the anchor cable disc (3) through the ball bearing (25).

4. The jet grouting anchor construction drill bit according to claim 3, characterized in that: The thickened part (21) and the drill bit body (1) are integrally formed by turning.

5. The jet grouting anchor construction drill bit according to claim 4, characterized in that: A guide plate (221) is machined at the bottom of the tapered guide surface (22), and the guide plate (221) slopes downward to transition to the mounting surface (101).

6. The jet grouting anchor construction drill bit according to claim 5, characterized in that: Multiple spherical grooves (231) are distributed in a ring at the bottom of the fixed disk (23). The ball (25) is assembled in the spherical groove (231). The top of the movable disk (24) is machined with stepped holes (241) corresponding to the spherical grooves (231). Part of the ball (25) extends to the outside of the movable disk (24) after passing through the stepped holes (241). Multiple screws (242) are arranged in a ring at the upper end of the movable disk (24). The screws (242) penetrate the fixed disk (23) upward and are fitted with nuts (243).

7. The jet grouting anchor construction drill bit according to claim 6, characterized in that: At the bottom of the fixed plate (23), a protruding ring (232) is machined on the outside of the spherical groove (231). The protruding ring (232) is coaxial with the stepped hole (241) and is inserted into the stepped hole (241).

8. The jet grouting anchor construction drill bit according to claim 7, characterized in that: A cleaning hole (233) is provided on the top of the fixed plate (23) and penetrates the spherical groove (231).

Images