High-pressure rotary jet grouting drill bit

Abstract

The high-pressure rotary jet grouting drill bit comprises a drill bit body and a hollow drill rod connected with a drilling machine, one end of the hollow drill rod is sleeved with a drill bit sleeve, an insertion hole is formed in the outer end of the drill bit sleeve, the drill bit body is inserted into the insertion hole, and a limiting disc of an integrated structure is arranged at the position, located in the insertion hole, of the lower end of the drill bit body. A water cavity is formed in the limiting disc, a groove is formed in the middle of the bottom of the limiting disc, a spray head protruding block is fixedly installed at the position, close to the limiting disc, of the hollow drill rod, the spray head protruding block is inserted into the groove and communicates with the water cavity, and a plurality of spray nozzle holes communicating with the water cavity are formed in the top of the drill bit sleeve in the perimeter direction. The structure is simple, installation is convenient, the drill bit can be conveniently replaced, and the replacement complexity is reduced; the water outlet direction of the nozzle hole is consistent with the drilling direction of the drill bit, so that the deviation of the drilling direction is effectively reduced; and through quick replacement of the drill bit, the working efficiency is improved, and meanwhile, the deviation of drilling levelness and perpendicularity can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and particularly relates to a high-pressure jet grouting drill bit. Background Art

[0002] For a high-pressure jet grouting pile, a high-pressure cement slurry is sprayed into the soil layer through a rotating nozzle to cut and mix the soil, and finally a continuous overlapping cement solid is formed. The jet grouting drill bit is a key component of the high-pressure jet grouting pile construction equipment.

[0003] At the present stage, the jet grouting drill bits used in high-pressure jet grouting pile construction are generally rod-shaped cavity structures. A conical tip is provided at the front end of the drill bit, and one or more nozzles are provided at the neck. Along with the rotation of the drill bit, high-pressure cement slurry is continuously sprayed from the nozzles to cut the surrounding soil, and the excess soil is discharged in an overflow manner.

[0004] Since the nozzles on the drill bit are usually arranged in an inclined shape, as the drilling depth increases, the water sprayed in an inclined shape will affect the drilling direction. At the same time, the drill bit will be worn after long-term use. The current drill bit is inconvenient to replace, resulting in the staff using the worn drill bit for a long time. If the severely worn drill bit is not replaced in time, it will also cause large deviations in the horizontal and verticality of the drilling. It is necessary to measure the horizontal and vertical of the jet grouting every 5m of drilling, which affects the drilling efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to provide a high-pressure jet grouting drill bit, by setting a drill bit sleeve, nozzle holes and alloy wing spray nozzles, to solve the problems of inconvenient disassembly of the drill bit body and large error of the nozzle affecting the drilling direction proposed in the above background art.

[0006] According to one aspect of the present disclosure, the following technical solution is provided: A high-pressure jet grouting drill bit includes a drill bit body and a hollow drill pipe connected to a drilling rig. One end of the hollow drill pipe is sleeved with a drill bit sleeve. The outer end of the drill bit sleeve is provided with a plug hole. The drill bit body is inserted into the plug hole. At the lower end of the drill bit body located in the plug hole, there is a limiting disk with an integral structure. A water cavity is arranged inside the limiting disk, and a groove is opened in the middle of the bottom of the limiting disk. A spray head convex block is fixedly installed at a position of the hollow drill pipe close to the limiting disk. The spray head convex block is inserted into the groove and communicated with the water cavity. A plurality of nozzle holes communicating with the water cavity are opened along the circumferential direction at the top of the drill bit sleeve.

[0007] For the high-pressure jet grouting drill bit according to at least one embodiment of the present disclosure, a limiting groove is opened inside the plug hole. An alloy wing is fixedly provided on one side of the drill bit body. The alloy wing is inserted into the limiting groove.

[0008] The high-pressure rotary jet grouting drill bit according to at least one embodiment of the present disclosure, a plurality of rib grooves are uniformly vertically formed on the inner side wall of the drill bit sleeve, and a plurality of convex ribs are fixedly arranged on the outer side of the hollow drill rod, and the convex ribs are inserted into the rib grooves at corresponding positions.

[0009] The high-pressure rotary jet grouting drill bit according to at least one embodiment of the present disclosure, the drill bit sleeve is connected to the hollow drill rod by bolts.

[0010] The high-pressure rotary jet grouting drill bit according to at least one embodiment of the present disclosure, a washer is sleeved on the surface of the nozzle bump, and the washer is located between the limiting disc and the end of the hollow drill rod.

[0011] The high-pressure rotary jet grouting drill bit according to at least one embodiment of the present disclosure, the cross sections of the groove and the nozzle bump are both in the shape of a Reuleaux triangle.

[0012] The technical effects and advantages of the present utility model:

[0013] The structure is simple and the installation is convenient, which can facilitate the replacement of the drill bit and reduce the complexity of replacement;

[0014] The water outlet direction of the nozzle hole is consistent with the drilling direction of the drill bit, effectively reducing the deviation of the drilling direction;

[0015] By quickly replacing the drill bit, the working efficiency is improved, and at the same time, the deviation of the drilling level and verticality can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings illustrate exemplary embodiments of the present disclosure and are used in conjunction with the description thereof to explain the principles of the present disclosure. The drawings are included to provide a further understanding of the present disclosure and are incorporated into and constitute a part of this specification.

[0017] Figure 1 is an overall structural schematic diagram of a high-pressure rotary jet grouting drill bit according to an embodiment of the present disclosure.

[0018] Figure 2 is a cross-sectional view of a high-pressure rotary jet grouting drill bit according to an embodiment of the present disclosure.

[0019] Figure 3 is a structural schematic diagram of the drill bit sleeve of a high-pressure rotary jet grouting drill bit according to an embodiment of the present disclosure.

[0020] The specific reference numerals in the drawings are as follows:

[0021] 1, hollow drill rod; 11, convex rib; 12, nozzle bump, 2, drill bit sleeve; 21, nozzle hole; 22, limiting notch; 23, rib groove; 24, insertion hole; 3, drill bit body; 31, alloy wing; 32, groove; 33, limiting disc, 331, water cavity, 4, washer. Detailed implementation mode

[0022] For descriptive purposes, the present disclosure may use spatial relative terms such as "under", "below", "beneath", "lower", "above", "over", "upper", and "side (e.g., as in "side wall")" to describe the relationship between one component and another (other) component as shown in the drawings. In addition to the orientation depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacturing. For example, if the device in the drawing is flipped, the component described as "under" or "beneath" another component or feature will then be positioned "above" the other component or feature. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. In addition, the device can be positioned otherwise (e.g., rotated 90 degrees or at other orientations), and accordingly, the spatial relative descriptive terms used herein are interpreted.

[0023] As Figures 1-3 shown, a high-pressure jet grouting drill bit in the present disclosure includes a drill bit body 3 and a hollow drill pipe 1 connected to a drill rig. One end of the hollow drill pipe 1 is sleeved with a drill bit sleeve 2. The outer end of the drill bit sleeve 2 is provided with a socket hole 24. The drill bit body 3 is inserted into the socket hole 24. A limiting disk 33 with an integral structure is arranged inside the drill bit body 3 at the lower end in the socket hole 24. A water cavity 331 is arranged inside the limiting disk 33, and a groove 32 is opened in the middle of the bottom of the limiting disk 33. A nozzle bump 12 is fixedly installed on the hollow drill pipe 1 near the limiting disk 33. The nozzle bump 12 is inserted into the groove 32 and communicated with the water cavity 331. A plurality of nozzle holes 21 communicating with the water cavity 331 are opened along the circumferential direction at the top of the drill bit sleeve 2. The hollow drill pipe 1 is externally connected to a slurry pipe. The slurry can enter the water cavity 331 through the nozzle bump 12 on the hollow drill pipe 1 and then be sprayed out through the nozzle holes 21.

[0024] To prevent the drill bit body 3 from rotating, in this embodiment, a limiting notch 22 is opened on the inner side of the socket hole 24. An alloy wing 31 with an integral structure is fixedly arranged on one side of the drill bit body 3. The alloy wing 31 is inserted into the limiting notch 22.

[0025] Furthermore, to prevent the drill bit sleeve 2 from rotating on the hollow drill pipe 1, in this embodiment, a plurality of rib grooves 23 are uniformly vertically opened on the inner side wall of the drill bit sleeve 2. A plurality of ribs 11 are fixedly arranged on the outer side of the hollow drill pipe 1. The ribs 11 are inserted into the rib grooves 23 at corresponding positions.

[0026] In this embodiment, the drill bit sleeve 2 is connected to the hollow drill pipe 1 by bolts.

[0027] Further, to ensure the sealing performance, in this embodiment, a gasket 4 is sleeved on the surface of the nozzle bump 12, and the gasket 4 is located between the limit disc 33 and the end of the hollow drill rod 1.

[0028] In this embodiment, the cross-sections of the groove 32 and the nozzle bump 12 are both in the shape of a Reuleaux triangle.

[0029] The specific operation steps are as follows: Connect the hollow drill rod 1 to the driving shaft of the drilling equipment and simultaneously connect the slurry pipe; Insert the hollow drill rod 1 into the drill bit sleeve 2 and fix it with screws or bolts, so that the nozzle bump 12 thereon is inserted into the groove 32 of the drill bit body 3; The hollow drill rod 1 drives the drill bit sleeve 2 and the drill bit body 3 to rotate; During the rotation, the slurry is transported through the internal holes of the nozzle bump 12 to the water cavity 331 of the limit disc 33; The water cavity 331 is communicated with the nozzle hole 21 at the upper part of the drill bit sleeve 2, and the nozzle hole 21 can vertically eject the slurry; After drilling for a certain period of time, remove the drill bit sleeve 2 from the hollow drill rod 1, and then the drill bit body 3 can be replaced.

[0030] In the description of this specification, the descriptions with reference to the terms "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present disclosure and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications can be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A high-pressure rotary jet grouting drill bit, comprising a drill bit body and a hollow drill rod connected to a drilling rig, characterized in that: A drill sleeve is sleeved on one end of the hollow drill rod, and a plug-in hole is provided on the outer end of the drill sleeve. The drill body is inserted in the plug-in hole. A limit plate of an integrated structure is provided at the lower end of the drill body located in the plug-in hole. A water cavity is provided inside the limit plate, and a groove is provided in the middle part of the bottom of the limit plate. A nozzle block is fixedly installed on the hollow drill rod near the limit plate. The nozzle block is inserted in the groove and connected with the water cavity. A plurality of nozzle holes connected with the water cavity are provided on the top of the drill sleeve along the circumference direction.

2. The high-pressure rotary jet grouting drill bit according to claim 1, characterized in that: A limiting slot is provided on the inner side of the plug-in hole, and an alloy wing with an integral structure is fixedly provided on one side of the drill body, and the alloy wing is inserted into the limiting slot.

3. The high-pressure rotary jet grouting drill bit according to claim 1, characterized in that: The inner side wall of the drill head sleeve is evenly and vertically provided with a plurality of rib grooves, and the outer side of the hollow drill rod is fixedly provided with a plurality of convex ribs, which are inserted into the rib grooves at corresponding positions.

4. The high-pressure rotary jet grouting drill bit according to claim 1, characterized in that: The drill bit sleeve is connected with the hollow drill rod through bolts.

5. The high-pressure rotary jet grouting drill bit according to claim 1, characterized in that: A washer is sleeved on the surface of the nozzle convex block, and the washer is located between the limiting plate and the end of the hollow drill rod.

6. The high-pressure rotary jet grouting drill bit according to claim 1, characterized in that: The cross-sections of the groove and the nozzle protrusion are both in the shape of a Lello triangle.

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