Rotary excavating pile drill bit for overlong secant pile in pebble water-rich stratum

Abstract

The utility model discloses a rotary excavating pile drill bit for a super-long secant pile in a pebble water-rich stratum, which comprises a barrel with a closed upper end and an open lower end. The upper bottom plate is mounted at the bottom end of the cylinder body and is hinged to the cylinder body; the lower bottom plate is symmetrically mounted on the upper bottom plate along the center of the cylinder body, and a double-door space allowing drilling slag to enter is formed between the upper bottom plate and the lower bottom plate in the circumferential direction of the cylinder body; the cutting teeth are mounted on the side edge of the lower bottom plate and are arranged in a downward inclined manner; the pressing rod mechanism comprises a shaft rod and a connecting plate, the connecting plate is connected between the lower bottom plates in the diameter direction of the barrel, the lower end of the shaft rod is hinged to the connecting plate, and the upper end of the shaft rod penetrates out of the closed end of the barrel and is used for being connected with a driving mechanism on the drilling machine. The upper bottom plate and the lower bottom plate are arranged at the lower end of the barrel body to form the double-bottom double-door drilling bucket, and the double-bottom double-door drilling bucket is suitable for hard strata, shell layers, compact clay layers and gravel-cobble layers and is high in adaptability to medium-hard and hard strata.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary drilling rigs, and in particular to a rotary drilling bit for ultra-long interlocking piles in pebble-rich water-bearing strata. Background Technology

[0002] Drilled cast-in-place piles have been widely used in various pile foundation projects, including subways, light rail, highways, railways, and water conservancy projects, due to their mature construction technology, high bearing capacity, and wide applicability. Drilled cast-in-place piles are generally constructed using two methods: impact drilling rigs and rotary drilling rigs. For hard strata, shell layers, dense clay layers, and gravel layers, rotary drilling rigs are generally used to form the holes, taking into account the on-site construction period.

[0003] Existing rotary drilling bits generally include open-body bits and double-bottom bits. Open-body bits, due to their excessively large bottom opening, are prone to significant cuttings falling off during the cutting removal process when the drill bucket is full of cuttings, thus reducing drilling efficiency, especially in poorly cemented gravel layers. Double-bottom bits are mainly suitable for sandy soils and poorly cemented gravel layers with small particle sizes. They are less suitable for medium-hard to hard strata such as hard strata, shell layers, dense clay layers, and gravel layers. Utility Model Content

[0004] This invention provides a rotary drilling bit for ultra-long interlocking piles in pebble-rich water-bearing strata, which solves the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model relates to a rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata, including...

[0007] The cylindrical body is closed at the top and open at the bottom.

[0008] The upper base plate is installed at the bottom end of the cylinder and hinged to the cylinder.

[0009] The lower bottom plate is symmetrically installed on the upper bottom plate along the center of the cylinder. A double-door space for drilling cuttings to enter is formed on the upper bottom plate between the lower bottom plate and the cylinder along the circumferential direction of the cylinder.

[0010] Cutting teeth are installed on the side of the lower base plate and tilted downwards.

[0011] The pressure rod mechanism includes a shaft and a connecting plate. The connecting plate is connected between the bottom plates along the diameter direction of the cylinder. The lower end of the shaft is hinged to the connecting plate, and the upper end extends out of the closed end of the cylinder for connection with the drive mechanism on the drilling rig.

[0012] This utility model relates to an ultra-long interlocking pile rotary drilling bit for gravelly, water-rich strata. Furthermore, the cylinder body is a straight cylinder structure with a consistent upper and lower diameter.

[0013] This utility model relates to an ultra-long interlocking pile rotary drilling bit for pebble-rich water-bearing strata. Furthermore, multiple patches are spaced apart on the circumferential wall of the cylinder.

[0014] In this utility model, an ultra-long interlocking pile is used in rotary drilling bits for pebble-rich water-bearing strata. Furthermore, multiple sets of the patch are arranged along the axial direction of the cylinder.

[0015] In this utility model, an ultra-long interlocking pile rotary drilling bit is used in pebble-rich water-bearing strata. Furthermore, the lower base plate is a triangular plate, and the cutting teeth are installed on the side of the lower base plate.

[0016] In this utility model, an ultra-long interlocking pile rotary drilling bit for pebble-rich water-bearing strata is further described. The lower base plate is a triangular pyramid structure, with one of the planes of the pyramid facing outwards and the tip of the pyramid located at the lowest end. The cutting teeth are installed on the side of the lower base plate.

[0017] In this utility model, an ultra-long interlocking pile rotary drilling bit for pebble-rich water-bearing strata is further described, wherein the lower bottom plate is set obliquely downward from the side wall of the cylinder to the axis of the cylinder.

[0018] In this utility model, an ultra-long interlocking pile rotary drilling bit is used in pebble-rich water-bearing strata. Furthermore, the inclination angle of the cutting teeth is 30-45°.

[0019] In this utility model, the ultra-long interlocking pile rotary drilling bit for pebble-rich water-bearing strata further features a cutting tooth bottom elevation that gradually increases from the side wall of the cylinder to the cylinder axis.

[0020] This utility model relates to an ultra-long interlocking pile rotary drilling bit for gravelly, water-rich strata. Furthermore, the pressure rod mechanism includes a drive rod, a guide rod, and a connecting rod. The drive rod and guide rod are connected to the connecting rod, and the upper ends of both the drive rod and guide rod extend from the closed end of the cylinder. The drive rod is used to connect to the drive mechanism on the drilling rig. The shaft is located at the axial position of the cylinder, and its upper end is connected to the connecting rod.

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] 1. This application provides an upper bottom plate and a lower bottom plate at the lower end of the cylinder to form a double-bottom, double-door drill bit, which is suitable for hard strata, shell layers, dense clay layers and gravel layers, and has strong adaptability to medium-hard to hard strata;

[0023] 2. A symmetrical double-door structure is formed on the upper bottom plate. Drill cuttings enter the cylinder through the double-door structure, which improves the cuttings removal efficiency. The symmetrical double doors ensure that the drilling cuttings enter evenly during the rotation of the sand-removing drill bucket, making the drilling cuttings in the drill bucket cylinder evenly distributed and ensuring the balance and stability of the sand-removing drill bucket.

[0024] 3. The bottom elevation of the cutting teeth is gradually increased. When the drill bit is drilling, the center tooth drills first to form a U-shape, and the cutting teeth on both sides follow to drill in sequence. The next cutting tooth cuts into the vicinity of the inner hollow position formed by the previous cutting tooth, which improves the rock breaking ability. When the drill bit deviates, the center tooth located in the groove can form anti-deviation resistance to avoid hole deviation.

[0025] 4. The bottom plate is designed as a triangular pyramid structure, which enhances the strength and durability of the bottom plate. On the other hand, the inclined plane formed on the bottom plate guides the drill cuttings, gradually swirling them into the cylinder.

[0026] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a plan view of the bottom surface of the cylinder of this utility model;

[0029] Figure 3 This is a schematic diagram of the pressure bar mechanism of this utility model.

[0030] Figure label:

[0031] 1. Cylinder body; 2. Patch; 3. Connecting square head; 4. Upper base plate; 5. Lower base plate; 6. Cutting tooth; 7. Drive rod; 8. Guide rod; 9. Connecting rod; 10. Shaft; 11. Connecting plate. Detailed Implementation

[0032] like Figures 1-3 As shown, this utility model discloses a rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata, comprising:

[0033] The cylinder is closed at the top and open at the bottom. It is a straight cylinder with a uniform diameter from top to bottom, providing excellent guidance. In uneven geological formations or strata with loose rocks, the straight cylinder adheres closely to the borehole wall, acting as a guide. Furthermore, multiple patches are spaced around the circumference of the outer wall of the cylinder. These patches are arranged in two groups, one near the bottom and one near the top. Preferably, the patches are evenly spaced along the outer wall of the cylinder. These patches increase the fit between the cylinder wall and the pile hole, improving the verticality of the pile and ensuring that the horizontal deviation of the borehole does not exceed 5 cm and the vertical deviation does not exceed 1 / 300. Secondly, each bucket of the straight cylinder can hold more excavated soil, allowing for a 5-10 cm greater advance per bucket compared to a cone-shaped cylinder, increasing the amount of soil removed per batch by 12%, thereby improving construction efficiency and accelerating the construction period.

[0034] The connecting square head is formed at the closed end of the cylinder and located at the center of the cylinder. It is used to connect with the drilling rig and drive the cylinder to carry out drilling work.

[0035] The system consists of an upper base plate and a lower base plate. The upper base plate is installed at the bottom of the cylinder and is hinged to the cylinder via a shaft, allowing it to rotate along the hinge. The lower base plate is symmetrically positioned on the upper base plate along the center of the cylinder and is fixedly connected to it. The gap between the two lower base plates along the circumference of the cylinder creates a double-door space on the upper base plate for drill cuttings to enter. The sidewalls of the lower base plate are equipped with several downward-sloping cutting teeth at 30-45° angles, symmetrically arranged about the axis of the cylinder. During drill bit rotation, drill cuttings enter through the double doors formed by the upper and lower base plates, improving the efficiency of cuttings removal. The symmetrically positioned double doors ensure that drill cuttings enter the cylinder evenly during drill bit rotation and cuttings removal, resulting in uniform distribution of drill cuttings within the cylinder and guaranteeing the balance and stability of cuttings removal.

[0036] Furthermore, the lower base plate is obliquely downward from the cylinder wall to the cylinder axis; in one embodiment of this application, the lower base plate is triangular, preferably, the lower base plate is set as a triangular pyramid structure, one of the planes of the pyramid structure is set outward, and the tip of the triangular pyramid is located at the lowest end, which on the one hand enhances the strength of the lower base plate and makes it more durable, and on the other hand, the inclined plane formed on the lower base plate has a guiding effect on the drill cuttings, gradually spiraling the drill cuttings into the cylinder.

[0037] The cutting teeth include side teeth and center teeth. The center teeth are located on the innermost side of the bottom plate. The bottom surface of the cutting teeth gradually increases from the side wall of the cylinder to the axis of the cylinder. The center teeth have a guiding function. When the drill bit is drilling, the center teeth drill first to form a U-shape. The cutting teeth on both sides follow and drill to achieve sequential drilling. The next cutting tooth cuts into the vicinity of the inner hollow position formed by the previous cutting tooth, which improves the rock breaking ability. When the drill bit deviates, the center teeth located in the groove can form anti-deviation resistance to avoid deviation of the hole.

[0038] The pressure rod mechanism, used to drive the upper base plate to open and close, includes a drive rod, a guide rod, a connecting rod, a shaft, and a connecting plate. The drive rod and the guide rod are connected to both ends of the connecting rod, and the upper ends of the drive rod and the guide rod both extend from the closed end of the cylinder. The drive rod and the guide rod are symmetrically arranged about the center of the cylinder. The drive rod is used to connect to the drive mechanism on the drilling rig and serves as the force-applying member of the pressure rod mechanism. The shaft is located at the axis of the cylinder, with its upper end connected to the connecting rod and its lower end hinged to the connecting plate. The connecting plate is triangular and connects between the two lower base plates. The drive rod drives the shaft to move up and down, thereby driving the upper base plate to open and close.

[0039] A guide plate is fixed to the connecting square head, and the drive rod passes through the guide plate and connects to the drive mechanism on the drilling rig.

[0040] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata, characterized in that: include The cylindrical body is closed at the top and open at the bottom. The upper base plate is installed at the bottom end of the cylinder and hinged to the cylinder. The lower bottom plate is symmetrically installed on the upper bottom plate along the center of the cylinder. A double-door space for drilling cuttings to enter is formed on the upper bottom plate between the lower bottom plate and the cylinder along the circumferential direction of the cylinder. Cutting teeth are installed on the side of the lower base plate and tilted downwards. The pressure rod mechanism includes a shaft and a connecting plate. The connecting plate is connected between the bottom plates along the diameter direction of the cylinder. The lower end of the shaft is hinged to the connecting plate, and the upper end extends out of the closed end of the cylinder for connection with the drive mechanism on the drilling rig.

2. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The cylinder is a straight cylindrical structure with the same diameter at the top and bottom.

3. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: Multiple patches are spaced apart on the peripheral wall of the cylinder.

4. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 3, characterized in that: Multiple sets of patches are arranged along the axial direction of the cylinder.

5. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The lower base plate is a triangular plate, and the cutting teeth are installed on the side of the lower base plate.

6. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The lower base plate is a triangular pyramid structure, with one of its planes facing outwards and the tip of the pyramid located at the lowest point. The cutting teeth are installed on the side of the lower base plate.

7. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 5 or 6, characterized in that: The bottom plate is set obliquely downward from the side wall of the cylinder to the axis of the cylinder.

8. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The inclination angle of the cutting teeth is 30-45°.

9. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The elevation of the bottom surface of the cutting tooth gradually increases from the side wall of the cylinder to the axis of the cylinder.

10. The rotary drilling bit for ultra-long interlocking piles in gravelly, water-rich strata according to claim 1, characterized in that: The pressure rod mechanism also includes a drive rod, a guide rod, and a connecting rod. The drive rod and the guide rod are connected to the connecting rod. The upper ends of the drive rod and the guide rod both extend out from the closed end of the cylinder. The drive rod is used to connect to the drive mechanism on the drilling rig. The shaft is located at the axis of the cylinder, and its upper end is connected to the connecting rod.

Images