Drill bit structure of cast-in-situ bored pile

Abstract

The drill bit structure of the cast-in-situ bored pile relates to the technical field of cast-in-situ bored piles and comprises a main shaft, a plurality of side wings are fixed to the outer side wall of the main shaft, stabilizing rings are fixed to the peripheries of the side wings, a positioning groove is formed in the bottom end of the main shaft, and a drill tip part is arranged in the positioning groove; a mounting hole is formed in the outer side wall of the drill tip part in a penetrating manner, a water outlet hole is formed in the bottom of the outer side wall of the main shaft, the water outlet hole and the mounting hole are opposite to each other, a mounting pipe is arranged in the water outlet hole and the mounting hole in a penetrating manner, a water pipe is arranged in the main shaft, and the lower end of the water pipe is inserted into the drill tip part and is inserted into the mounting pipe. The drill tip part can be conveniently disassembled, assembled and replaced, the whole drill bit is prevented from being replaced, waste is reduced, and cost is reduced; and the mounting pipe and the water pipe simultaneously play roles in locking and discharging water, so that the space utilization rate is increased.

Description

Technical Field

[0001] This application relates to the field of bored pile technology, and in particular to a drill bit structure for bored piles. Background Technology

[0002] Drilled piles are piles constructed by creating a hole in the foundation soil on-site using methods such as mechanical drilling, steel pipe extrusion, or manual digging, then placing a reinforcing cage inside and pouring concrete. Specialized drill bits are required when drilling the pile hole. Simultaneously, the drill bit is flushed with mud through an outlet and cooled.

[0003] Utility model patent CN206035386U discloses a three-wing double-waist hoop drill bit for bored piles with a traction drill rod, including an upper waist hoop, a lower waist hoop, wing plates, a drill rod, and a traction drill. The drill rod is vertically arranged and is connected to the upper and lower waist hoops, which are coaxially spaced, by multiple radially arranged wing plates. The bottom end of the drill rod is threaded coaxially connected to the traction drill. The upper part of the traction drill has a circular hole. Multiple drill teeth are fixedly installed at intervals on the bottom of the traction drill, the lower end face of the wing plate, the lower end face of the lower waist hoop, and the inclined section formed by the wing plate at the transition end between the lower and upper waist hoops. The end of each drill tooth is inlaid with an alloy.

[0004] Regarding the aforementioned technologies, the tip of the drill bit at the bottom of the bored pile is the first part to come into contact with hard objects such as rocks, making it a vulnerable part. If the entire drill bit is replaced directly after the tip is damaged, the cost is too high and it is wasteful. Utility Model Content

[0005] This application provides a drill bit structure for bored piles, which allows for independent replacement of the drill tip at the bottom of the drill bit, thereby reducing costs and avoiding waste.

[0006] The drill bit structure for bored piles provided in this application adopts the following technical solution:

[0007] A drill bit structure for bored piles includes a main shaft, with multiple side wings fixed to the outer side wall of the main shaft, and a stabilizing ring fixed to the outer periphery of the side wings. A positioning groove is provided at the bottom end of the main shaft, and a drill tip is provided in the positioning groove. An installation hole is provided through the outer side wall of the drill tip. A water outlet is provided at the bottom of the outer side wall of the main shaft. The water outlet and the installation hole are directly opposite each other. An installation pipe is provided through the water outlet and the installation hole. A water pipe is provided inside the main shaft, and the lower end of the water pipe is inserted into the drill tip and then into the installation pipe.

[0008] By adopting the above technical solution, when it is necessary to remove the drill tip, first pull up the water pipe to detach its lower end from the mounting pipe, thus releasing the lock on the mounting pipe. Then, pull the mounting pipe horizontally to release the lock on the drill tip, allowing the drill tip to move downwards and separate from the spindle. After the drill tip is repaired or replaced, the locking process is reversed.

[0009] Optionally, the mounting tube is a rectangular tube, and the top surface of the mounting tube is provided with a socket for inserting a water supply pipe.

[0010] By adopting the above technical solution, and by setting a rectangular installation tube, the contact position between the installation tube and the water pipe is a standard ring, which facilitates the setting of the sealing ring inside the socket and avoids the rotation angle of the installation tube, making it easy to connect and insert the water pipe into the socket.

[0011] Optionally, the bottom of the side wall of the water pipe is provided with a water passage hole, which is located inside the installation pipe.

[0012] By adopting the above technical solution, water in the water pipe is transported into the installation pipe through the water passage hole, and water can still flow out of the water passage hole even if the lower end of the water pipe is blocked.

[0013] Optionally, the inner wall of the main shaft is fixed with several stabilizers, and the water pipe passes through the stabilizers and is slidably connected to the stabilizers.

[0014] By adopting the above technical solution, the water pipe is confined to the middle of the main shaft by the stabilizer, and the stabilizer can guide the vertical sliding of the water pipe.

[0015] Optionally, the outer wall of the water pipe is provided with an annular groove, and a sealing ring is provided in the annular groove, the sealing ring being located at the insertion hole.

[0016] By adopting the above technical solution, a seal is established between the outer wall of the water pipe and the inner wall of the installation pipe through the sealing ring, thus preventing water leakage.

[0017] Optionally, a horizontally arranged reinforcing plate is fixed to the inner wall of the mounting tube.

[0018] By adopting the above technical solution, the reinforcing plate is used to improve the bending strength of the installation pipe.

[0019] Optionally, the reinforcing plate has several through holes.

[0020] By adopting the above technical solution, the through holes are used for free water flow, reducing the obstruction of water by the reinforcing plate.

[0021] Optionally, multiple side teeth are fixed on the side wing.

[0022] By adopting the above technical solution and using multiple side teeth, the drilling effect is ensured.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. It allows for easy disassembly and replacement of the drill tip, avoiding the need to replace the entire drill bit, reducing waste and lowering costs;

[0025] 2. The installation pipe and water pipe serve the functions of locking and water outlet, improving space utilization. Attached Figure Description

[0026] Figure 1 This is a perspective view of the drill bit structure of a bored pile according to an embodiment;

[0027] Figure 2 This is a cross-sectional view of an embodiment;

[0028] Figure 3 yes Figure 2 Enlarged view of point A;

[0029] Figure 4 This is a partial exploded view of an embodiment.

[0030] Explanation of reference numerals in the attached drawings: 1. Spindle; 2. Side wing; 21. Side tooth; 22. Stabilizing ring; 11. Positioning groove; 3. Drill tip; 31. Mounting hole; 12. Water outlet hole; 4. Mounting pipe; 5. Water pipe; 13. Stabilizing frame; 41. Insertion hole; 51. Sealing ring; 52. Water passage hole; 42. Reinforcing plate; 43. Through hole. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 This embodiment discloses a drill bit structure for bored piles, including a main shaft 1, a plurality of side wings 2 fixed on the outer side wall of the main shaft 1, a plurality of side teeth 21 fixed on the side wings 2, the drilling effect is ensured by the side teeth 21, a stabilizing ring 22 is fixed on the outer periphery of the side wings 2, and the main shaft 1 is a thick-walled hollow structure.

[0033] Reference Figure 2 The bottom end of the spindle 1 is provided with a positioning groove 11, and a drill tip 3 is provided in the positioning groove 11. The top end of the drill tip 3 is positioned by the positioning groove 11. A mounting hole 31 is provided through the outer wall of the drill tip 3. The mounting hole 31 is opened radially along the drill tip 3. A water outlet hole 12 is provided at the bottom of the outer wall of the spindle 1. The water outlet hole 12 and the mounting hole 31 are directly opposite each other. A mounting tube 4 is provided through both the water outlet hole 12 and the mounting hole 31.

[0034] A water pipe 5 is installed inside the spindle 1. The lower end of the water pipe 5 is inserted into the drill tip 3 and into the mounting tube 4. Several stabilizers 13 are fixed on the inner wall of the spindle 1. The water pipe 5 passes through the stabilizers 13 and is slidably connected to the stabilizers 13. The stabilizers 13 limit the water pipe 5 to the middle of the spindle 1, and the water pipe 5 can slide up and down under tension.

[0035] Reference Figure 3 and Figure 4 The water outlet 12 and mounting hole 31 are both rectangular holes. The mounting pipe 4 is a rectangular tube, and its top surface has a insertion hole 41 for the water supply pipe 5. An annular groove is formed on the outer wall of the water pipe 5, located at the lower part of the pipe. A sealing ring 51 is installed inside the groove, located at the insertion hole 41. The sealing ring 51 creates a seal between the outer wall of the water pipe 5 and the inner wall of the mounting pipe 4, preventing leakage. By using a rectangular mounting pipe 4, the contact point between the mounting pipe 4 and the water pipe 5 is a standard annular shape, facilitating the installation of the sealing ring 51 and preventing rotation of the mounting pipe 4, thus facilitating the insertion of the water pipe 5 into the insertion hole 41.

[0036] A water passage hole 52 is provided at the bottom of the side wall of the water pipe 5. The water passage hole 52 penetrates the water pipe 5 radially and is located inside the installation pipe 4. After the water pipe 5 is fully inserted into the installation pipe 4, the bottom end of the water pipe 5 contacts the inner bottom wall of the installation pipe 4 to form a positioning, and the water in the water pipe 5 is transported into the installation pipe 4 through the water passage hole 52.

[0037] A horizontally arranged reinforcing plate 42 is fixed to the inner wall of the mounting pipe 4, and several through holes 43 are provided on the reinforcing plate 42. The reinforcing plate 42 is located in the middle of the mounting pipe 4 and is used to improve the bending strength of the mounting pipe 4. The reinforcing plate 42 is fixed to the inner wall of the mounting pipe 4 by welding. The through holes 43 are used to allow water to flow freely and reduce the obstruction of water by the reinforcing plate 42.

[0038] Unless otherwise specified, all components of this drill bit are made of metal.

[0039] The implementation principle of a drill bit structure for a bored pile according to an embodiment of this application is as follows: when it is necessary to remove the drill tip 3, first pull up the water pipe 5 so that the lower end of the water pipe 5 is separated from the installation pipe 4, thereby releasing the lock on the installation pipe 4. Then, pull out the installation pipe 4 horizontally to release the lock on the drill tip 3. Then the drill tip 3 can move downward and separate from the main shaft 1.

[0040] After the drill tip 3 is repaired or replaced, insert the drill tip 3 into the positioning groove 11, and then insert the installation pipe 4 into the water outlet 12 and the mounting hole 31 to prevent the drill tip 3 from falling off. Then, move the water pipe 5 downward and insert it into the installation pipe 4 to lock it in place and prevent the installation pipe 4 from moving on its own. When the drill bit is working, the water in the water pipe 5 flows into the installation pipe 4 and then is discharged outward through the end of the installation pipe 4.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drill bit structure of a cast-in-place bored pile, comprising a main shaft (1), a plurality of side wings (2) are fixed to the outer side wall of the main shaft (1), and a stabilizing ring (22) is fixed to the outer periphery of the side wings (2), characterized in that: The bottom end of the main shaft (1) is provided with a positioning groove (11), the positioning groove (11) is provided with a drill tip (3), the outer side wall of the drill tip (3) is provided with a mounting hole (31), the bottom of the outer side wall of the main shaft (1) is provided with a water outlet hole (12), the water outlet hole (12) and the mounting hole (31) are opposite to each other, the water outlet hole (12) and the mounting hole (31) are provided with a mounting pipe (4) penetrating through, the main shaft (1) is provided with a water pipe (5), the lower end of the water pipe (5) is inserted into the drill tip (3) and the mounting pipe (4).

2. The drill bit structure of a cast-in-place pile according to claim 1, characterized in that: The mounting pipe (4) is a rectangular pipe, the top surface of the mounting pipe (4) is provided with a jack (41) for inserting the water pipe (5).

3. The drill bit structure of a cast-in-place pile according to claim 1, characterized in that: The side wall of the water pipe (5) is provided with a water passing hole (52), and the water passing hole (52) is located in the mounting pipe (4).

4. The drill bit structure of a cast-in-place pile according to claim 1, characterized in that: The inner wall of the main shaft (1) is fixedly provided with a plurality of stabilizing frames (13), the water pipe (5) penetrates through the stabilizing frame (13) and is in sliding connection with the stabilizing frame (13).

5. The drill bit structure of a cast-in-place pile according to claim 2, characterized in that: The outer side wall of the water pipe (5) is provided with a ring groove, the ring groove is provided with a sealing ring (51), and the sealing ring (51) is located at the jack (41).

6. The drill bit structure of a cast-in-place pile according to claim 1, characterized in that: The inner wall of the mounting pipe (4) is fixedly provided with a horizontally arranged reinforcing plate (42).

7. A drill bit structure for a cast-in-place pile according to claim 6, wherein: A plurality of through holes (43) are formed in the reinforcing plate (42).

8. The drill bit structure of a cast-in-place pile according to claim 1, characterized in that: A plurality of side teeth (21) are fixedly arranged on the side wing (2).

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