Stirring pile planting drill bit used on gravel-cobble stratum

Abstract

The utility model relates to a stirring pile planting drill bit used on a gravel-cobble stratum, which comprises a stirring drill bit, the stirring drill bit is fishtail-shaped, the center of the stirring drill bit is provided with a mounting groove, and a connecting pipe unit used for connecting the stirring drill bit with a drill rod is fixedly mounted in the mounting groove; a guniting opening is formed in the bottom of the connecting pipe unit, the guniting opening faces the bottom of the mounting groove and is located on the rear side of the stirring drill bit, and a guniting gap is reserved between the guniting opening and the bottom of the mounting groove; drill tips are fixedly installed on the two side edges of the stirring drill bit respectively, the drill tips and the central axis of the stirring drill bit are distributed in an included angle mode, the drill tip on one side is located on the front face of one side of the stirring drill bit, and the drill tip on the other side is located on the back face of the other side of the stirring drill bit. Long drill teeth are arranged at the bottom of the stirring drill bit, and the long drill teeth and the shaft core line of the stirring drill bit are distributed in parallel; the utility model has the advantages that the drilling efficiency is improved, the stability of the drill bit is enhanced, the loss is reduced, and the spouting port is prevented from being blocked.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile driving construction, and particularly relates to a mixing pile driving bit for cobble stratum. Background Technique

[0002] Mixing pile driving is a new pile foundation construction technology that is pollution-free, low-cost, high-efficiency, and has good engineering quality. First, a deep mixing machine is used to cut and mix the soil and then inject cement slurry. High-speed cutting and mixing are carried out according to the preset grouting volume and cutting and mixing times to form a fluid cement-soil pile. Secondly, precast piles are implanted into the cement-soil pile to form a composite pile foundation. Compared with the traditional bored cast-in-place pile process, mixing pile driving has low cost, no soil extraction, no mud discharge, and high construction efficiency. Compared with the traditional precast concrete pile process, mixing pile driving does not produce soil extrusion effect and can penetrate hard interlayers. It is a pile foundation scheme that has been widely promoted in recent years.

[0003] At present, when drilling in cobble stratum, problems such as rapid bit wear, poor stability, low drilling efficiency, and easy blockage of the slurry spraying port by crushed stones are often encountered. These problems significantly affect the construction efficiency and cost. There is a lack of a bit in the prior art that can effectively solve these problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and provide a mixing pile driving bit for cobble stratum to improve the drilling efficiency, enhance the bit stability, reduce the loss, and prevent the slurry spraying port from being blocked.

[0005] The purpose of the utility model is achieved by the following technical solutions. This mixing pile driving bit for cobble stratum includes a mixing bit. The mixing bit is fish-tail shaped. An installation groove is provided at the center of the mixing bit. A connecting pipe unit for connecting the mixing bit and the drill pipe is fixedly installed in the installation groove. A slurry spraying port is provided at the bottom of the connecting pipe unit. The slurry spraying port faces the bottom of the installation groove and is located at the rear side of the mixing bit. And a slurry spraying gap is left between the slurry spraying port and the bottom of the installation groove. Drill tips are respectively and fixedly installed on both sides of the mixing bit. The drill tips are distributed at an angle with the axis line of the mixing bit. One of the drill tips is located on one side of the front surface of the mixing bit, and the other drill tip is located on the other side of the rear surface of the mixing bit. Long drill teeth are provided at the bottom of the mixing bit. The long drill teeth are distributed parallel to the axis line of the mixing bit.

[0006] The beneficial effects of the present utility model are as follows: Compared with the prior art, through the fish-tail shape design of the mixing drill bit, the integrity and stability of the drill bit are improved. The drill tip and long drill teeth design improves the drilling efficiency in the crushed stone layer. The installation groove design in the middle and the improvement of the slurry spraying port effectively prevent the blockage problem. At the same time, the optimized path for the mixing soil body to pass through further improves the construction efficiency.

[0007] Preferably, the connecting unit includes a steel pipe and a flange. The steel pipe is welded and fixed on the groove wall of the installation groove. The flange is welded and fixed on the upper end surface of the steel pipe. And a number of reinforcing ribs are welded between the flange and the side wall of the steel pipe at equal intervals. Through the setting of the above structure, the mixing drill bit can be connected and fixed to the drill pipe through the flange. At the same time, the setting of the reinforcing ribs is beneficial to improving the strength of the connecting unit.

[0008] Preferably, a slurry spraying pipe is installed in the center of the steel pipe. One end of the slurry spraying pipe penetrates through the center of the flange. The other end of the slurry spraying pipe is communicated with the slurry spraying port. Through the setting of the above structure, the slurry spraying port can be communicated with the external slurry spraying equipment, facilitating high-pressure slurry spraying.

[0009] Preferably, a reinforcing rib that can play a strengthening role is welded and fixed between the side wall of the steel pipe and the body of the mixing drill bit.

[0010] Preferably, two symmetrically distributed positioning pins are provided on the end surface of the flange. By setting the positioning pins, when the mixing drill bit is installed on the drill pipe through the flange, accurate positioning can be achieved, and the transmission force and stability can also be enhanced.

[0011] Preferably, two holes that are beneficial for the mixing soil body to pass through are opened on the body of the mixing drill bit, and the holes are symmetrically distributed along the axis of the mixing drill bit. Such a setting can facilitate the passage of the mixing soil body, reduce the mixing resistance, and further improve the construction efficiency.

[0012] Preferably, there are two long drill teeth, which are symmetrically distributed along the axis of the mixing drill bit. One of the long drill teeth is located on the front side of one side of the mixing drill bit, and the other long drill tooth is located on the reverse side of one side of the mixing drill bit. Through the setting of the above structure, it can play a role in guiding tunneling and improve the drilling efficiency in the crushed stone layer. Description of the Drawings

[0013] Figure 1 is a three-dimensional structural schematic diagram of the mixing pile planting drill bit of the present utility model.

[0014] Figure 2 is a front view structural schematic diagram of the mixing pile planting drill bit of the present utility model.

[0015] Figure 3 isFigure 2 Schematic diagram of the A-A sectional structure

[0016] The reference numerals in the drawings are respectively: 1, mixing drill bit; 2, connecting pipe unit; 3, slurry spraying gap; 4, drill tip; 5, long drill teeth; 6, slurry spraying pipe; 11, installation groove; 12, hole; 21, slurry spraying port; 22, steel pipe; 23, flange; 24, reinforcing rib; 25, rib; 26, positioning pin Specific embodiments

[0017] The following will introduce the present utility model in detail with reference to the drawings: As shown Figures 1 to 3 in the figure, the present utility model includes a mixing drill bit 1, the mixing drill bit 1 is fish-tail shaped, an installation groove 11 is provided in the center of the mixing drill bit 1, and a connecting pipe unit 2 for connecting the mixing drill bit 1 with a drill pipe is fixedly installed in the installation groove 11; a slurry spraying port 21 is provided at the bottom of the connecting pipe unit 2, the slurry spraying port 21 faces the bottom of the installation groove 11 and is located at the rear side of the mixing drill bit 1, and a slurry spraying gap 3 is left between the slurry spraying port 21 and the bottom of the installation groove 11, which can realize downward slurry spraying to prevent the slurry spraying port 21 from being stressed and blocked by crushed stones; drill tips 4 are respectively fixedly installed on both sides of the mixing drill bit 1, the drill tips 4 are distributed at an angle with the axis line of the mixing drill bit 1, and the included angle a is 15°, one of the drill tips 4 is located on the front side of one side of the mixing drill bit 1, and the other drill tip 4 is located on the reverse side of the other side of the mixing drill bit 1; long drill teeth 5 are provided at the bottom of the mixing drill bit 1, and the long drill teeth 5 are distributed parallel to the axis line of the mixing drill bit 1. The above-mentioned drill tip 4 is a conical drill tip, and the angle of the drilling cone surface of the drill tip is designed to be 90°, which is suitable for efficient drilling in gravel sand strata

[0018] The connecting unit 2 includes a steel pipe 22 and a flange 23, the steel pipe 22 is welded and fixed on the groove wall of the installation groove 11, the flange 23 is welded and fixed on the upper end surface of the steel pipe 22, and a number of reinforcing ribs 24 are welded between the flange 23 and the side wall of the steel pipe 22 and are distributed at equal intervals

[0019] A slurry spraying pipe 6 is installed in the center of the steel pipe 22, one end of the slurry spraying pipe 6 penetrates through the center of the flange 23, and the other end of the slurry spraying pipe 6 communicates with the slurry spraying port 21

[0020] A rib 25 that can play a strengthening role is welded and fixed between the side wall of the steel pipe 22 and the body of the mixing drill bit 1

[0021] Two symmetrically distributed positioning pins 26 are provided on the end surface of the flange 23

[0022] Two holes 12 that are beneficial for the mixing soil to pass through are provided on the body of the mixing drill bit 1, and the holes 12 are symmetrically distributed along the axis line of the mixing drill bit 1

[0023] There are two long drill teeth 5, which are symmetrically distributed along the axis of the mixing drill bit 1. One long drill tooth 5 is located on the front side of one side of the mixing drill bit 1, and the other long drill tooth 5 is located on the reverse side of one side of the mixing drill bit 1.

[0024] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A stirring pile drilling bit for use in gravel formations, comprising a stirring drilling bit (1), characterized in that: The stirring drill bit (1) is in a fishtail shape. A mounting groove (11) is provided at the center of the stirring drill bit (1). A connecting pipe unit (2) for connecting the stirring drill bit (1) to a drill rod is fixedly installed in the mounting groove (11). A grouting port (21) is provided at the bottom of the connecting pipe unit (2). The grouting port (21) faces the bottom of the mounting groove (11) and is located at the rear side of the stirring drill bit (1). A grouting port (21) is provided between the grouting port (21) and the bottom of the mounting groove (11). The stirring drill bit (1) has a slurry gap (3); drill tips (4) are respectively installed and fixed on both sides of the stirring drill bit (1), and the drill tips (4) are distributed at an angle with the axis of the stirring drill bit (1), wherein the drill tip (4) on one side is located on the front side of one side of the stirring drill bit (1), and the drill tip (4) on the other side is located on the reverse side of the other side of the stirring drill bit (1); a long drill tooth (5) is provided at the bottom of the stirring drill bit (1), and the long drill tooth (5) is distributed in parallel with the axis of the stirring drill bit (1).

2. The mixing pile drilling bit for gravel formation according to claim 1, characterized in that: The connecting pipe unit (2) comprises a steel pipe (22) and a flange (23); the steel pipe (22) is welded and fixed to the groove wall of the installation groove (11); the flange (23) is welded and fixed to the upper end surface of the steel pipe (22); and a plurality of reinforcing ribs (24) distributed at equal intervals are welded between the flange (23) and the side wall of the steel pipe (22).

3. The mixing pile drilling bit for gravel formation according to claim 2, characterized in that: A spraying pipe (6) is installed at the center of the steel pipe (22), one end of the spraying pipe (6) penetrates the center of the flange (23), and the other end of the spraying pipe (6) penetrates the spraying port (21).

4. The mixing pile drilling bit for gravel formation according to claim 2, characterized in that: A rib (25) capable of playing a reinforcing role is welded and fixed between the side wall of the steel pipe (22) and the body of the stirring drill bit (1).

5. The mixing pile drilling bit for gravel formation according to claim 2, characterized in that: Two symmetrically distributed positioning pins (26) are provided on the end surface of the flange (23).

6. The mixing pile drilling bit for gravel formation according to claim 1, characterized in that: The body of the stirring drill bit (1) is provided with two holes (12) which are convenient for stirring soil to pass through, and the holes (12) are symmetrically distributed along the axis of the stirring drill bit (1).

7. The mixing pile drilling bit for gravel formation according to claim 1, characterized in that: The long drill teeth (5) are provided with two and are symmetrically distributed along the axis of the stirring drill bit (1), wherein one of the long drill teeth (5) is located on the front side of the stirring drill bit (1), and the other long drill tooth (5) is located on the reverse side of the stirring drill bit (1).

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