Drill bit structure for soft soil roadbed

Abstract

The utility model relates to the technical field of roadbed construction, in particular to a drill bit structure for a soft soil roadbed, which comprises a main drill bit, blades, a plurality of end drills and a plurality of crushing drills, the main drill bit is frustum-shaped, the blades are spirally arranged on the outer side of the main drill bit, the end drills are connected with the ends of the main drill bit and form 45-degree angles with a soil cutting surface, and the crushing drills are arranged on the outer side of the main drill bit. And a plurality of crushing drills are connected to the blades. According to the drill bit, the end drill is arranged at the end of the main drill bit in the protruding mode, the drilling angle of the main drill bit is reduced, the drilling strength is improved, the hard ground can be drilled more easily, after the hard ground is drilled through the end drill firstly, follow-up main drill bit punching operation is facilitated, the hole forming time is shortened to the maximum extent, and the drilling efficiency is improved. The crushing drill bit II is arranged on the outer end face of the blade and is parallel to the blade, the crushing drill bit II can crush solids with large particle sizes in the drilling process, and the possibility of drill jamming in the construction process is reduced to the maximum extent.

Description

Technical Field

[0001] This utility model relates to the field of roadbed construction technology, and in particular to a drill bit structure for soft soil roadbeds. Background Technology

[0002] During the construction of high-speed railways, due to the relatively soft subgrade in some sections, it is necessary to drill holes in the subgrade to install bolt piles. In the existing drill bit structure, the end of the drill bit is flat. During the drilling process, due to the hard surface geology of the soft soil subgrade, the drill bit takes a long time to drill the ground layer. In addition, the process of removing drilling cuttings is difficult, which leads to the drill getting stuck. Ultimately, this results in poor hole quality after drilling. Utility Model Content

[0003] In view of the technical problems existing in the background art, the purpose of this utility model is to provide a drill bit structure for soft soil subgrade, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A drill bit structure for soft soil subgrade includes a main drill bit, blades, several end drills, and several breaking drills. The main drill bit is truncated cone-shaped, the blades are spirally arranged on the outside of the main drill bit, the several end drills are connected to the ends of the main drill bit and are arranged at a 45° angle to the cutting surface, and the several breaking drills are connected to the blades.

[0006] Preferably, the outer end face of the blade is provided with several grooves, which are evenly distributed.

[0007] Preferably, the breaker bit includes a breaker bit I, which is disposed at the cut surface position at the end of the blade.

[0008] Preferably, the cutting surface of the breaker bit I is at a 45° angle to the cutting surface.

[0009] Preferably, the breaker bit includes a breaker bit II, which is disposed at the outer end face of the blade and is parallel to the blade.

[0010] Preferably, the system also includes a drill pipe, which is plugged into the main drill bit.

[0011] Preferably, the drill bit has a connector at its end, and the connector has protrusions around its perimeter.

[0012] Preferably, the drill rod is provided with a slot, the cross-sectional shape of which is the same as that of the connector rod, and the connector rod is connected in the slot.

[0013] This utility model has the following advantages and beneficial effects:

[0014] In this invention, the end drill is set at a 45° angle to the cutting surface, and the end drill protrudes from the end of the main drill bit. During drilling, several end drills first contact the ground, reducing the drilling angle of the main drill bit and increasing the drilling intensity, making it easier to drill through hard ground. After the end drills first drill through the hard ground, it is convenient for the subsequent drilling operation of the main drill bit, greatly reducing the time for hole formation. The crushing drill bit II is set at the outer end face of the blade and is parallel to the blade. The crushing drill bit II can crush larger particles during the drilling process, greatly reducing the possibility of the drill getting stuck during construction. Attached Figure Description

[0015] Figure 1 This is a front view of a drill bit structure for soft soil roadbed proposed in this utility model;

[0016] Figure 2 This is a top view of a drill bit structure for soft soil roadbed proposed in this utility model;

[0017] Figure 3 This is a schematic diagram of the main drill bit structure of a drill bit structure for soft soil roadbed proposed in this utility model;

[0018] Figure 4 This is a schematic diagram of the drill rod structure for a drill bit structure for soft soil roadbed proposed in this utility model.

[0019] Reference numerals: 2-Main drill bit, 21-Connecting rod, 22-Protrusion, 3-Blade, 31-Groove, 4-Drill rod, 41-Slot, 42-Card slot, 5-End drill, 6-Crushing drill bit I, 7-Crushing drill bit II. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Example

[0023] like Figure 3 , Figure 4As shown, a drill bit structure for soft soil subgrade includes a main drill bit 2, a drill rod 4, blades 3, several end drills 5, and several breaking drills. The drill rod 4 is the main shaft of the drilling rig. The main drill bit 2 is truncated cone-shaped. The drill rod 4 and the main drill bit 2 are connected by an insertion joint. The end of the main drill bit 2 is provided with an insertion rod 21. The insertion rod 21 is surrounded by protrusions 22, which are trapezoidal in structure. The drill rod 4 is provided with a slot 41. The slot 41 is surrounded by grooves 42. The grooves 42 and the slot 41 are connected. The cross-sectional shape of the slot 41 is... The cross-sectional shape of the connector rod 21 is the same, and the shapes of the slot 42 and the protrusion 22 are the same. The protrusion 22 and the slot 42 reduce friction through the bevel engagement. The main drill bit 2 is connected to the slot 41 of the drill rod 4 through the connector rod 21. The trapezoidal structure can effectively distribute the load when under force, and is especially good at bearing unidirectional lateral force. The inclined sidewall will generate friction when subjected to pressure in a specific direction, forming a self-locking effect. It can maintain a stable position without additional fasteners. The main drill bit 2 and the drill rod 4 can ensure good stability after being connected by the connector.

[0024] like Figures 1-4 As shown, the end drill 5 is connected to the end of the main drill bit 2 by welding. The end drill 5 is set at a 45° angle to the cutting surface. The end drill 5 protrudes from the end of the main drill bit 2. The end drill 5 is made of self-sharpening tungsten carbide alloy. During drilling, several end drills 5 first contact the ground, reducing the force of the main drill bit 2 during drilling, making it easier to drill through hard ground. After the end drills 5 drill through the hard ground first, it is convenient for the subsequent drilling operation of the main drill bit 2, which greatly reduces the time for hole formation.

[0025] like Figures 1-4 As shown, the blade 3 is spirally arranged on the outside of the main drill bit 2. During drilling, the drill bit rotates into the stratum under the action of drilling pressure, cutting the stratum in a spiral line. The soil debris scraped off is transported back to the borehole opening along the spiral blade 3. Several grooves 31 are provided on the outer end face of the blade 3. The grooves 31 are evenly arranged. During drilling, some of the soil debris scraped off can flow in the grooves 31, reducing the squeezing pressure of the soil debris on the blade 3, which can make the drilling process smoother and more stable. At the same time, the grooves 31 make the blade 3 toothed, which facilitates better cutting of the hole circumference during drilling, further improving the quality of the screw pile hole formation.

[0026] like Figures 1-4As shown, several rock breakers are connected to blade 3. The rock breakers are also made of self-sharpening tungsten carbide alloy. The rock breakers include rock breaker bit I6 and rock breaker bit II7. Rock breaker bit I6 is set at the cutting surface of the end of blade 3. Rock breaker bit I6 is at a 45° angle to the cutting surface. When the end drill 5 drills through the ground, the drill bit descends as a whole. If rock breaker bit I6 is not set, the ground will exert a large stress on the cutting surface of blade 3, which may easily cause blade 3 to break and affect the quality of drilling. After setting rock breaker bit I6 facing the cutting direction, rock breaker bit I6 contacts the ground first during the descent of the drill bit and breaks the ground, reducing the stress of the ground on blade 3, protecting the quality of blade 3 to the greatest extent, and making the drilling process smoother.

[0027] like Figures 1-3 As shown, the crushing drill bit II7 is located at the outer end face of the blade 3 and is arranged along the outer spiral line of the blade 3. The crushing drill bit II7 can crush large-diameter objects during the drilling process, which greatly reduces the possibility of the drill getting stuck during construction.

[0028] During drilling, drill rod 4 rotates counterclockwise one revolution, descending by one pitch. To maintain the stability of drill rod 4 during the descent, the drilling rig adjusts the speed of the large winch releasing the wire rope in real time according to the rotation speed of the power head, ensuring that the descent speed of drill rod 4 matches the speed of the wire rope release. That is, drill rod 4 rotates one revolution and descends by one pitch, compressing the soil to form a threaded shape. After the drill bit reaches the designed depth, the piling machine rotates clockwise to lift drill rod 4, maintaining the speed of drill rod 4 rotating clockwise one revolution and rising by one pitch to compress the soil and form the threaded space. Simultaneously with the clockwise lifting of the drill rod, concrete is injected into the hole to fill the threaded space in the soil, forming the concrete threaded section of the pile body.

[0029] This is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drill bit structure for soft soil roadbeds, characterized in that, It includes a main drill bit, blades, several end drills and several breakers. The main drill bit is in the shape of a frustum. The blades are spirally arranged on the outside of the main drill bit. Several end drills are connected to the ends of the main drill bit and are arranged at a 45° angle to the cutting surface. Several breakers are connected to the blades.

2. The drill bit structure for soft soil subgrade according to claim 1, characterized in that: The outer end face of the blade is provided with several grooves, which are evenly distributed.

3. The drill bit structure for soft soil subgrade according to claim 1, characterized in that: The breaker drill includes a breaker drill bit I, which is disposed at the cut surface position at the end of the blade.

4. The drill bit structure for soft soil subgrade according to claim 3, characterized in that: The cutting surface of the crushing drill bit I is at a 45° angle to the soil cutting surface.

5. The drill bit structure for soft soil subgrade according to claim 1, characterized in that: The breaker drill also includes a breaker drill bit II, which is disposed at the outer end face of the blade.

6. The drill bit structure for soft soil subgrade according to claim 1, characterized in that: It also includes a drill pipe, which is plugged into the main drill bit.

7. A drill bit structure for soft soil subgrade according to claim 6, characterized in that: The drill bit has a connector rod at its end, and the connector rod has protrusions around its perimeter.

8. A drill bit structure for soft soil subgrade according to claim 7, characterized in that: The drill rod is provided with a slot, the cross-sectional shape of which is the same as that of the connector rod, and the connector rod is connected in the slot.

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