Cast-in-situ bored pile cone rotary excavating drill bit

Abstract

The utility model provides a cast-in-situ bored pile cone rotary excavating drill bit which comprises a rotary excavating cone drill barrel, a cone drill bit, a cylinder and a tooth-shaped drill bit, and the cone drill bit and the cylinder are both arranged at the bottom of the rotary excavating cone drill barrel. The roller bit and the cylinder are uniformly distributed at 360 degrees along the circumferential direction of the bottom of the rotary excavating roller bit barrel; a connecting structure formed by the tooth-shaped drill bit and the cylindrical barrel deviates from the rotary excavating roller bit barrel body in the vertical direction to form an angle; the distance between the tooth-shaped drill bit and the bottom of the rotary excavating roller bit barrel body is larger than the distance between the roller bit and the bottom of the rotary excavating roller bit barrel body. Through the cooperation of the roller bit and the tooth-shaped drill bit and the detachable connection of the tooth-shaped drill bit and the cylinder, the drilling and hole-forming efficiency of the roller bit can be improved, the production cost of the bit can be reduced to a certain extent, and the service life of the roller bit can be prolonged.

Description

Technical Field

[0001] The utility model relates to the field of bored pile construction, in particular to a bored pile roller rotary drill bit. Background Art

[0002] With the continuous development of urban construction, the demand for large-scale bridge projects continues to increase. As an important part of foundation engineering, bored pile technology plays a key role in bridge engineering. Bored pile technology has been widely used in highway bridge engineering, tunnel bridge engineering, etc. due to its advantages such as high bearing capacity, high construction efficiency and strong adaptability. The core of bored pile technology is the type of drill bit in the hole forming process. Considering the hardness of the soil and rock in the area where the bridge is built, rotary drilling bits are often used for drilling holes.

[0003] At present, in the construction of bridge pile foundations and anti-slip piles in Guangxi and other regions of my country, hard granite is often encountered. The rock hardness is very high, which brings great challenges to the excavation of pile foundations. For this kind of slightly weathered and moderately weathered hard rock formations, roller bits are mainly used for drilling, but roller bits have the following phenomena during the drilling process:

[0004] (1) The production cost of a roller drill bit is very expensive, which is more than 20 times the production cost of an ordinary drill bit.

[0005] (2) The service life of the roller drill bit is relatively short. When the roller drill bit drills to a certain depth, the drill bit is worn flat by the soil layer, and the drill bits welded to the bottom of the rotary drilling barrel need to be replaced.

[0006] (3) When drilling in gravel layers, pebble layers or large boulders, the drill may get stuck. Utility Model Content

[0007] The purpose of the utility model is to provide a roller drill bit for bored piles, which can improve the drilling efficiency of the roller drill bit and reduce the production cost of the drill bit and increase the service life of the roller drill bit through the cooperation between the roller drill bit and the toothed drill bit and the detachable connection between the toothed drill bit and the cylindrical tube.

[0008] The technical solution to achieve the purpose of this utility model is as follows:

[0009] The utility model provides a bored cast-in-place pile rotary drill bit, comprising: a rotary drill cone barrel, a rotary drill bit, a cylindrical barrel and a toothed drill bit, wherein the rotary drill bit and the cylindrical barrel are both arranged at the bottom of the rotary drill cone barrel, and the rotary drill bit and the cylindrical barrel are evenly distributed at 360° along the circumferential direction of the bottom of the rotary drill cone barrel;

[0010] The connection structure formed by the toothed drill bit and the cylindrical barrel is offset from the rotary drill barrel in the vertical direction to form an angle;

[0011] The length of the toothed drill bit from the bottom of the rotary drilling cone drill barrel is greater than the length of the roller drill bit from the bottom of the rotary drilling cone drill barrel.

[0012] As a further limitation of the present invention, the cylindrical barrel is connected to the toothed drill bit, and the toothed drill bit is an ellipsoidal structure;

[0013] The roller drill bit is a spherical structure, and hard teeth are fixedly arranged on the outer surface of the roller drill bit.

[0014] As a further limitation of the present invention, it also includes a righting belt;

[0015] The straightening belt is arranged on the outer surface of the rotary drill cylinder.

[0016] As a further limitation of the present invention, the straightening belt closely fits the rock surface.

[0017] As a further limitation of the present invention, the cylindrical barrel and the toothed drill bit are detachably connected.

[0018] As a further limitation of the present invention, the distance between the toothed drill bit and the bottom of the rotary drill barrel is farther than the distance between the roller drill bit and the bottom of the rotary drill barrel.

[0019] As a further limitation of the present invention, the spiral direction of the toothed drill bit is consistent with that of the straightening belt.

[0020] As a further limitation of the present invention, the roller drill bit and the toothed drill bit are evenly distributed at the bottom of the rotary drilling roller drill barrel, and a line connecting the center of the roller drill bit and the center of the toothed drill bit to the bottom center of the rotary drilling roller drill barrel forms an angle of 30±5°.

[0021] As a further limitation of the present invention, it further comprises a square head, wherein the square head is arranged on the upper part of the rotary drill bit barrel.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The utility model of the bored pile roller drill bit has a rotary drilling roller drill barrel as the main structure, and the pile foundation is drilled by the roller drill bit welded at the bottom of the rotary drilling roller drill barrel. In order to expand the application range of the drill bit and speed up the drilling efficiency of the drill bit, a cylindrical barrel is welded at the bottom of the rotary drilling roller drill barrel, which is connected with the external thread of the toothed drill bit through the internal thread. For rock formations with lower hardness, the toothed drill bit can be directly used for crushing; when the formation is uneven, it can be processed with the toothed drill bit first, and then it can be disassembled and crushed with the roller drill bit, which can reduce unnecessary wear of the roller drill bit.

[0024] 2. The utility model welds a toothed drill bit at the bottom of the rotary drill cylinder, which forms an angle of 25° to 30° with the vertical direction of the cylinder. The deviation direction is consistent with the direction of the straightening belt welded on the outer surface of the rotary drill cylinder. The combination of the two can effectively improve the stability and drilling speed of the drill bit during drilling.

[0025] 3. The toothed drill bit of the utility model can cut rocks more effectively, reduce the risks of drill sticking and drill bit damage, and the combination of the toothed drill bit and the roller drill bit makes the drilling effect of the drill bit better; in terms of cost, since the toothed drill bit contacts the formation earlier than the roller drill bit, the toothed drill bit will be worn first during drilling, reducing the use of the roller drill bit, reducing wear, and thus reducing production costs; in terms of construction, the detachable form of the toothed drill bit will effectively shorten the construction preparation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a rotary drilling drill bit for bored piles provided by the utility model;

[0027] Figure 2 A schematic plan view of a rotary drilling bit for bored pile provided by the utility model;

[0028] Figure 3 A partial enlarged view of the bottom of a rotary drilling drill bit for bored piles provided by the utility model;

[0029] Figure 4 A bottom view of a rotary drilling drill bit for bored piles provided by the utility model;

[0030] Figure 5 A schematic diagram of the structure of the toothed drill bit and the cylindrical barrel provided by the utility model;

[0031] Figure numerals: 1-square head; 2-rotary drill barrel; 3-straightening belt; 4-hard teeth; 5-toothed drill bit; 6-cylindrical barrel; 7-rotary drill bit; 101-upper thread; 102-lower thread. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0033] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment of the utility model provides a bored cast-in-place pile rotary drill bit, comprising: a rotary drill cone barrel 2, a rotary drill bit 7, a cylindrical barrel 6 and a toothed drill bit 5, the rotary drill bit 7 and the cylindrical barrel 6 are both arranged at the bottom of the rotary drill cone barrel 2, and the rotary drill bit 7 and the cylindrical barrel 6 are evenly distributed 360° along the circumferential direction of the bottom of the rotary drill cone barrel 2; the connection structure formed by the toothed drill bit 5 and the cylindrical barrel 6 forms an angle with the rotary drill cone barrel 2 in the vertical direction; the length of the toothed drill bit 5 from the bottom of the rotary drill cone barrel 2 is greater than the length of the rotary drill bit 7 from the bottom of the rotary drill cone barrel 2.

[0034] The bored pile roller drill bit of the embodiment of the utility model has a rotary drilling roller drill barrel 2 as the main structure, and the pile foundation is formed by the roller drill bit 7 welded at the bottom of the rotary drilling roller drill barrel 2. In order to expand the application range of the drill bit and speed up the drilling efficiency of the drill bit, a cylindrical barrel 6 is welded at the bottom of the rotary drilling roller drill barrel 2, which is connected with the external thread of the toothed drill bit 5 through the internal thread. For rock formations with lower hardness, the toothed drill bit 5 can be directly used for crushing; when the formation is uneven, the toothed drill bit 5 can be used for processing first, and then it can be disassembled and crushed by the roller drill bit 7, which can reduce unnecessary wear of the roller drill bit 7. In addition, the cylindrical barrel 6 of the embodiment of the utility model is connected with the toothed drill bit 5 by a threaded manner, which is convenient for the disassembly of the toothed drill bit 5, and the combined use of the toothed drill bit 5 and the roller drill bit 7 can improve the drilling efficiency of the drill bit.

[0035] Please continue reading Figure 1 , Figure 2 and Figure 3 The cylindrical barrel 6 of the utility model embodiment is connected to the toothed drill bit 5. The toothed drill bit 5 is an ellipsoidal structure and is used to break rocks with lower hardness such as strongly weathered granite. The roller drill bit 7 is a spherical structure and hard teeth 4 are fixed on the outer surface of the roller drill bit 7. The hard teeth 4 are used to break hard rocks such as slightly weathered granite. The structure formed by the toothed drill bit 5 and the cylindrical barrel 6 deviates from the vertical direction of the barrel by a certain angle, and the deviation direction is consistent with the direction of the spirally distributed straightening belt 3, which is conducive to improving the drilling efficiency of the drill bit. Please continue to read Figure 3 and Figure 4The roller drill bit 7 and the toothed drill bit 5 of the utility model embodiment are evenly distributed at the bottom of the rotary drilling roller drill barrel 2, and the line connecting the center of the roller drill bit 7 and the center of the toothed drill bit 5 to the bottom center of the rotary drilling roller drill barrel 2 is at an angle of 30±5°, ensuring that the soil layer is fully broken when the roller drill bit 7 and the toothed drill bit 5 are used in combination.

[0036] Please continue reading Figure 1 and Figure 2 The bored pile rotary drill bit of the utility model embodiment further comprises a straightening belt 3, which is welded on the outer surface of the bored pile rotary drill bit and is spirally distributed. The straightening belt 3 is arranged on the outer surface of the rotary drill barrel 2. Preferably, the straightening belt 3 is closely attached to the rock surface.

[0037] See also Figure 5 In the embodiment of the utility model, the cylindrical barrel 6 and the toothed drill bit 5 are preferably detachably connected. In the embodiment of the utility model, the roller drill bit 7 and the cylindrical barrel 6 are preferably welded at the lower part of the rotary drilling roller drill barrel 2. The cylindrical barrel 6 has threads inside, and the toothed drill bit 5 has threads on the outer surface. The two parts are connected by threads, which is convenient for loading and unloading the toothed drill bit 5. The roller drill bit 7 and the cylindrical barrel 6 are evenly distributed at the bottom of the rotary drilling roller drill barrel 2.

[0038] The distance between the toothed drill bit 5 and the bottom of the rotary drill barrel 2 is farther than the distance between the toothed drill bit 7 and the bottom of the rotary drill barrel 2. In this way, the toothed drill bit 5 can be used preferentially to break the formation. Furthermore, in the embodiment of the utility model, the spiral direction of the toothed drill bit 5 is preferably consistent with that of the straightening belt 3. The spiral direction is at an angle of 25° to 30° with the vertical direction of the barrel.

[0039] The number of the roller drill bits 7 and the toothed drill bits 5, the drill bit radius and the number of hard teeth 4 on the surface of the roller drill bits 7 in the embodiment of the utility model can be flexibly selected according to the hardness of the soil layer. When the hardness of the soil layer is very large, multiple roller drill bits 7 and toothed drill bits 5 can be set, and the radius of the drill bits and the number of hard teeth 4 can be appropriately increased; when the hardness of the soil layer is relatively small, the number of roller drill bits 7 and toothed drill bits 5 can be appropriately reduced, and the radius of the drill bits and the number of hard teeth 4 can be reduced.

[0040] In practical applications, please continue to refer to Figures 1 to 5The utility model discloses a rotary drill bit for bored cast-in-place piles, comprising a square head 1, a rotary drill barrel 2 and a rotary drill bit 7 welded at the bottom. A plurality of spiral straightening belts 3 are evenly welded on the outside of the rotary drill barrel 2, and the spiral design can improve the operation accuracy and safety during the drilling process, making the drilling operation smoother and more efficient. A cylindrical barrel 6 is evenly welded on the bottom of the rotary drill barrel 2, and the lower thread 102 inside the cylindrical barrel is connected to the upper thread 101 on the outer surface of the toothed drill bit 5. When only the rotary drill bit 7 is used, it can be directly disassembled and installed conveniently. When the drill bit is drilling a hole for the pile foundation, the rotary drill bit 7 welded at the bottom of the rotary drill barrel 2 and the toothed drill bit 5 connected to the cylindrical barrel 6 begin to break the soil layer. When the hardness of the broken soil layer is relatively small, the toothed drill bit 5 will be drilled and broken first because it is closer to the soil layer first; when the hardness of the broken soil layer is relatively large, the toothed drill bit 5 can be disassembled, and the roller drill bit 7 is used for drilling because a large number of hard teeth 4 are distributed on the surface of the roller drill bit 7 to improve the drilling efficiency; when the soil layer is uneven or there are gravel and large isolated rocks, the toothed drill bit 5 can be used to break and level the soil layer first, because the toothed drill bit 5 is connected to the cylindrical tube 6, it can be disassembled and replaced when the drill bit is ground flat, and the toothed drill bit 5 has no hard teeth on the surface, so the manufacturing cost is low. The toothed drill bit 5 is used until the soil layer is leveled and then the roller drill bit 7 is used for drilling, which reduces the wear of the roller drill bit 7 and reduces the production cost. The straightening belt 3 welded on the outer surface of the rotary roller drill barrel 2 is spiral, which can effectively reduce the shaking and swinging of the drill bit when the drill bit is drilling, and improve the accuracy of drilling. The roller drill bit 7 and the toothed drill bit 5 welded at the bottom of the rotary drilling roller drill barrel 2 can be used in combination to speed up the drilling efficiency. The cylindrical barrel 6 welded at the bottom of the rotary drilling roller drill barrel 2 has a lower thread 102 inside that is screwed with an upper thread 101 on the outer surface of the toothed drill bit 5, which is convenient for disassembly of the toothed drill bit. The toothed drill bit 5 is farther away from the barrel bottom 2 than the roller drill bit 7, so the toothed drill bit 5 can be used first to break the stratum, reducing the wear and use of the roller drill bit 7. The toothed drill bit 5 is consistent with the spiral direction of the straightening belt 3, and is approximately 25° to 30° with the vertical direction of the barrel, which effectively reduces the shaking and swinging of the drill bit. The roller drill bit 7 and the toothed drill bit 5 are evenly distributed at the bottom of the barrel 2, and the line connecting the center of the roller drill bit 7 and the center of the toothed drill bit 5 to the center of the bottom of the barrel is at an angle of 30°, ensuring that the soil layer is fully broken when the roller drill bit 7 and the toothed drill bit 5 are used in combination. The number of roller drill bits 7 and toothed drill bits 5, the drill bit radius and the number of hard teeth 4 on the surface of the roller drill bit can be flexibly selected according to the hardness of the soil layer. When the hardness of the soil layer is very large, multiple roller drill bits 7 and toothed drill bits 5 can be set, and the drill bit radius and the number of hard teeth 4 can be appropriately increased; when the hardness of the soil layer is relatively small, the number of roller drill bits 7 and toothed drill bits 5 can be appropriately reduced, and the drill bit radius and the number of hard teeth 4 can be reduced.

[0041] The toothed drill bit introduced in the embodiment of the utility model can cut rocks more effectively, reducing the risk of drill bit sticking and drill bit damage. At the same time, the combination with the roller drill bit further improves the drilling effect of the drill bit; in terms of cost, since the toothed drill bit contacts the formation first, it is first worn during the drilling process, which reduces the demand for the roller drill bit, thereby reducing wear and production costs; in terms of construction, the detachable design of the toothed drill bit can effectively reduce the construction preparation time and facilitate quick installation.

[0042] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rotary drill bit for bored piles, characterized in that: include: A rotary drilling derrick barrel, a rotary drill bit, a cylindrical barrel and a toothed drill bit, wherein the rotary drill bit and the cylindrical barrel are both arranged at the bottom of the rotary drilling derrick barrel, and the rotary drill bit and the cylindrical barrel are evenly distributed 360° along the circumferential direction of the bottom of the rotary drilling derrick barrel; The connection structure formed by the toothed drill bit and the cylindrical barrel is offset from the rotary cone drill barrel in the vertical direction to form an angle; The length of the toothed drill bit from the bottom of the rotary drilling cone drill barrel is greater than the length of the roller drill bit from the bottom of the rotary drilling cone drill barrel.

2. A bored pile rotary drill bit according to claim 1, characterized in that: The cylindrical tube is connected to the toothed drill bit, and the toothed drill bit is an ellipsoid structure; The roller drill bit is a spherical structure, and hard teeth are fixedly arranged on the outer surface of the roller drill bit.

3. The bored pile rotary drill bit according to claim 1, characterized in that: Also included are righting belts; The straightening belt is arranged on the outer surface of the rotary drill cylinder.

4. A bored pile rotary drill bit according to claim 3, characterized in that: The straightening belt fits closely to the rock surface.

5. The bored pile rotary drill bit according to claim 1, characterized in that: The cylindrical barrel and the toothed drill bit are detachably connected.

6. The bored pile rotary drill bit according to claim 1, characterized in that: The distance between the toothed drill bit and the bottom of the rotary drill barrel is farther than the distance between the roller drill bit and the bottom of the rotary drill barrel.

7. The bored pile rotary drill bit according to claim 3, characterized in that: The spiral direction of the toothed drill bit is consistent with that of the straightening belt.

8. The bored pile rotary drill bit according to claim 1, characterized in that: The roller drill bit and the toothed drill bit are evenly distributed at the bottom of the rotary drill barrel, and the line connecting the center of the roller drill bit and the center of the toothed drill bit to the bottom center of the rotary drill barrel forms an angle of 30±5°.

9. The bored pile rotary drill bit according to claim 1, characterized in that: It also includes a square head, which is arranged on the upper part of the rotary drill bit cylinder.

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