Rotary excavating drill bit for hole forming of cast-in-place pile

Abstract

The rotary excavating drill bit comprises a drill cylinder, a drill rod is arranged in the drill cylinder, a cutting device is arranged at the bottom of the drill cylinder, a slurry overflowing opening is formed in the side wall of the drill cylinder, a power head pressing disc is arranged in the drill cylinder, a pressing and jacking rod is connected below the power head pressing disc, and a jacking and pressing plate is connected below the pressing and jacking rod. A limiting sleeve fixedly connected to the inner wall of the drilling barrel is arranged between the power head pressing disc and the top pressing plate, the bottom of the drilling rod is sleeved with the limiting sleeve, the limiting sleeve is fixedly connected with the bottom of the drilling rod, a mud discharging door is arranged on the top pressing plate in the drilling barrel, and the bottom end of the limiting sleeve is connected with a door opening structure used for opening the mud discharging door. According to the utility model, slurry remaining in the top pressure steel plate can be conveniently discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bored pile technical field, concretely relates to a rotary drilling head for bored pile hole forming. BACKGROUND

[0002] At present, in the construction process of the bored pile, it is usually necessary to use the rotary drilling head to drill, and the rotary drilling head is a comprehensive drilling equipment with strong multi-working-condition adaptability, and its core advantages are reflected in wide stratum adaptation range, high hole forming efficiency, strong environmental friendliness and flexible maneuverability.

[0003] However, when the traditional rotary drilling head is used in the construction of the cohesive soil layer, the cohesive soil is easily adhered to the drill cylinder during the drilling in the cohesive soil layer due to the strong viscosity of the cohesive soil.

[0004] The existing rotary drilling head is described in the Chinese patent application with the announcement number CN213898914U, and the power head pressure disc, the pressure top rod and the top pressure steel plate are arranged in the drill cylinder, the pressure top rod is driven by the power head pressure disc to push the top pressure steel plate to move, and thus the top pressure steel plate can push the cohesive soil in the drill cylinder out.

[0005] However, since the overflow port for discharging the mud in the drill cylinder is usually arranged on the drill cylinder, a part of the mud is left above the top pressure steel plate during the movement of the top pressure steel plate, and the overflow port is easily blocked by the cohesive soil, so that the mud is difficult to be discharged. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a rotary drilling head for bored pile hole forming, which is convenient for discharging the mud left in the top pressure steel plate.

[0007] To solve the above technical problems, the utility model adopts the following scheme:

[0008] A rotary drilling head for bored pile hole forming, comprising a drill cylinder, a drill rod arranged in the drill cylinder, a cutting device arranged at the bottom of the drill cylinder, an overflow port arranged on the sidewall of the drill cylinder, a power head pressure disc arranged in the drill cylinder, a pressure top rod connected below the power head pressure disc, a top pressure plate connected below the pressure top rod, a limiting sleeve fixedly connected to the inner wall of the drill cylinder and arranged between the power head pressure disc and the top pressure plate, the limiting sleeve being sleeved on the bottom of the drill rod and being fixedly connected to the bottom of the drill rod, a mud discharge door arranged on the top pressure plate in the drill cylinder, and an opening door structure connected to the bottom end of the limiting sleeve and used for opening the mud discharge door. The power head pressure disc itself adopts the prior art, and thus is not described herein. The function of the opening door structure and the mud discharge door is to discharge the mud entering above the top pressure plate from the overflow port.

[0009] Further, the top pressure plate is provided with a mounting groove for embedding the mud discharge door, and the mud discharge door is connected to the side facing the opening door structure and is provided with a stress structure for moving radially towards the drill cylinder by the opening door structure.

[0010] Further, the bottom end of the door opening structure is spherical. The door opening structure is in the shape of a rotary body, and the force receiving structure is located outside the axis of the door opening structure. The function is that, through the design of the shape of the door opening structure, the direction of the axial movement of the door opening structure is converted into the direction of the radial movement of the drill cylinder when the door opening structure contacts the force receiving structure.

[0011] Further, the force receiving structure is in the shape of a cylinder. When the mud discharge door is in a closed state, the top end of the section of the force receiving structure located in the projection of the door opening structure along the drill cylinder is in the shape of a convex cylindrical surface. The function is that, through the design of the shape of the force receiving structure, the radial movement of the force receiving structure is further facilitated.

[0012] Further, the top surface of the top pressing plate is in the shape of a concave funnel, and the mud discharge port is provided in the middle of the top pressing plate. The width of the mud discharge port is less than or equal to the width of the mud discharge door. The function is that, through the design of the shape of the top surface of the top pressing plate, the mud can be concentrated on the mud discharge port.

[0013] Further, the top surface of the top pressing plate is provided with a movable groove for the movement of the force receiving structure.

[0014] Further, the mud discharge door is provided with two, which are symmetrically arranged on the left and right sides of the door opening structure. The function is that, through the arrangement of the number of mud discharge doors, each mud discharge door only needs to move a small distance to form a relatively large opening.

[0015] Further, the installation groove and the mud discharge door are provided with a reset spring, the mud discharge door is provided with a spring cavity for placing the reset spring, and the installation cavity is provided with a support rod for embedding in the reset spring. The function is that, through the arrangement of the reset spring, the mud discharge door can be kept closed; through the arrangement of the spring cavity and the support rod, the reset spring can be fixed.

[0016] Further, the top pressing plate and the top pressing rod are connected through bolts, the top pressing plate is provided with through holes for the bolts to pass through and a sink for placing the head of the bolt, and the sink is provided with a cover. The cover is in interference fit with the sink, and the cover and the top pressing rod are respectively arranged on the opposite sides of the top pressing plate. The bottom surface of the cover is provided with a gripper for grabbing the cover.

[0017] Further, the limiting sleeve is provided with a through hole for the top pressing pipe to pass through.

[0018] The utility model has the beneficial effects:

[0019] 1. Through the arrangement of the mud discharge door and the door opening structure, the mud entering above the top pressing plate from the overflow port can be discharged.

[0020] 2. By designing the shape of the door opening structure, the door opening structure is converted from the axial movement direction of the drill cylinder to the radial movement direction of the drill cylinder when the door opening structure contacts the force receiving structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the embodiment 1;

[0022] Figure 2 is a sectional view of the embodiment 1; Figure 1 is an enlarged view of A in the embodiment 1;

[0023] Figure 3 is a sectional view of the embodiment 1;

[0024] Figure 4 is a sectional view of the embodiment 1.

[0025] Fig. 1 is a drill cylinder; Fig. 2 is a drill rod; Fig. 3 is a cutting device; Fig. 4 is a slurry overflow port; Fig. 5 is a power head pressure disc; Fig. 6 is a pressure rod; Fig. 7 is a pressure plate; Fig. 8 is a limiting sleeve; Fig. 9 is a mud discharge door; Fig. 10 is a door opening structure; Fig. 11 is a mounting groove; Fig. 12 is a force receiving structure; Fig. 13 is a mud discharge port; Fig. 14 is a movable groove; Fig. 15 is a return spring; Fig. 16 is a spring cavity; Fig. 17 is a support rod; Fig. 18 is a through hole; Fig. 19 is a sunken table; Fig. 20 is a cover; and Fig. 21 is a through hole. DETAILED DESCRIPTION

[0026] The utility model will be further described in detail below in combination with the embodiments and drawings, but the embodiments of the utility model are not limited thereto.

[0027] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the utility model is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] In the description of the utility model, still need to explain, unless another explicit provision and limitation, term '' set '' '' open '' '' install '' '' connect '' '' connection '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0029] Embodiment 1

[0030] A rotary drilling head for bored pile hole forming, as shown in Figure 1 It comprises a drill barrel 1, a drill rod 2 is arranged in the drill barrel 1, a cutting device 3 is arranged at the bottom of the drill barrel 1, a slurry overflow port 4 is arranged on the sidewall of the drill barrel 1, a power head pressure disc 5 is arranged in the drill barrel 1, a pressure top rod 6 is connected below the power head pressure disc 5, a top pressure plate 7 is connected below the pressure top rod 6, a limiting sleeve 8 fixedly connected to the inner wall of the drill barrel 1 is arranged between the power head pressure disc 5 and the top pressure plate 7, the limiting sleeve 8 is sleeved on the bottom of the drill rod 2 and is fixedly connected to the bottom of the drill rod 2, the top pressure plate 7 is provided with a mud discharge door 9 in the drill barrel 1, and an opening door structure 10 for opening the mud discharge door 9 is connected to the bottom end of the limiting sleeve 8. The cutting device 3 adopts the prior art, and details are not repeated. The cutting device 3 comprises the drill rod 2, a cross cutting beam and a drill bit pick, the cross cutting beam is fixed to the bottom of the drill barrel 1, the drill bit pick is fixed to the bottom of the drill barrel 1 and is arranged obliquely, and the power head pressure disc 5 is movably sleeved on the drill rod 2. Through the arrangement of the mud discharge door 9 and the opening door structure 10, the mud in the upper part of the top pressure plate 7 entering from the overflow port can be discharged.

[0031] Specifically, as shown in Figure 2 The top pressure plate 7 is provided with a mounting groove 11 for embedding the mud discharge door 9, and the mud discharge door 9 is connected to the side of the opening door structure 10 and is provided with a stress structure 12 for being pushed by the opening door structure 10 to move radially towards the drill barrel 1.

[0032] Specifically, as shown in Figure 4 The bottom end of the opening door structure 10 is spherical. The opening door structure 10 is in the shape of a rotary body, and the stress structure 12 is located outside the axis of the opening door structure 10. Through the design of the shape of the opening door structure 10, when the opening door structure 10 is in contact with the stress structure 12, the opening door structure 10 can be conveniently converted from the axial movement direction of the drill barrel 1 to the radial movement direction of the drill barrel 1.

[0033] Specifically, as shown in Figure 3As shown, the force bearing structure 12 is in the shape of a cylinder, and in the state that the mud discharging door 9 is closed, the top end of the section of the force bearing structure 12 within the projection of the door opening structure 10 along the axis of the drill cylinder 1 is in the shape of a convex cylindrical surface. Its function is to further facilitate the movement of the force bearing structure 12 along the radial direction of the drill cylinder 1 by the design of the shape of the force bearing structure 12.

[0034] Specifically, as shown in Figure 3 As shown, the top surface of the top pressing plate 7 is in the shape of a concave funnel, and a mud discharging port 13 is provided in the middle of the top pressing plate 7, and the width of the mud discharging port 13 is less than or equal to the width of the mud discharging door 9. Its function is to facilitate the concentration of mud on the mud discharging port 13 by the design of the shape of the top surface of the top pressing plate 7.

[0035] Specifically, as shown in Figure 3 As shown, the top surface of the top pressing plate 7 is provided with a movable slot 14 for the movement of the force bearing structure 12.

[0036] Specifically, as shown in Figure 1 As shown, the mud discharging door 9 is provided with two, which are symmetrically arranged on the left and right sides of the door opening structure 10. Its function is to make each mud discharging door 9 only move a small distance to form a relatively large opening by the number of mud discharging doors 9.

[0037] Specifically, as shown in Figure 2 As shown, the installation slot 11 and the mud discharging door 9 are provided with a reset spring 15, the mud discharging door 9 is provided with a spring cavity 16 for placing the reset spring 15, and the installation cavity is provided with a support rod 17 for embedding in the reset spring 15. Its function is that the reset spring 15 can be used to keep the mud discharging door 9 closed, and the spring cavity 16 and the support rod 17 can be used to fix the reset spring 15.

[0038] Specifically, as shown in Figure 2 As shown, the top pressing plate 7 and the top pressing rod 6 are connected by bolts, the top pressing plate 7 is provided with through holes 18 for the bolts to pass through and sink pads 19 for placing the heads of the bolts, and the sink pads 19 are provided with covers 20. The cover 20 is in interference fit with the sink pad 19, and the cover 20 and the top pressing rod are respectively arranged on the opposite sides of the top pressing plate 7, and the bottom surface of the cover 20 is provided with a gripper for grabbing the cover 20.

[0039] Specifically, as shown in Figure 4 As shown, the limiting sleeve 8 is provided with a through hole 21 for the top pressing rod to pass through.

[0040] The working principle of the embodiment is explained as follows: when the mud remaining on the top pressing plate 7 needs to be discharged, the power head pressure disc 5 controls the top pressing rod 6 to drive the top pressing plate 7 to move upward, so that the stress structure 12 contacts the door opening structure 10. Through the contact between the cylindrical surface on the stress structure 12 and the curved surface on the door opening structure 10, the door opening structure 10 pushes the stress structure 12 to the left and right sides, that is, the stress structure 12 drives the mud discharge door 9 to be pushed open along the radial direction of the drilling cylinder 1, so that the mud above the top pressing plate 7 can be discharged from the mud discharge port 13.

[0041] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. According to the technical essence of the present application, any simple modification, equivalent replacement, improvement, etc. of the above embodiment within the spirit and principles of the present application still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A rotary drilling bit for forming bored piles, comprising a drill barrel (1), a drill rod (2) inside the drill barrel (1), a cutting device (3) at the bottom of the drill barrel (1), an overflow port (4) on the side wall of the drill barrel (1), a power head pressure plate (5) inside the drill barrel (1), a top pressure rod (6) connected below the power head pressure plate (5), and a top pressure plate (7) connected below the top pressure rod (6), characterized in that: A limiting sleeve (8) is fixedly connected to the inner wall of the drill barrel (1) between the power head pressure plate (5) and the top pressure plate (7). The limiting sleeve (8) is sleeved outside the bottom of the drill rod (2) and the bottom of the drill rod (2) is fixedly connected. The drill barrel (1) is provided with a mud discharge door (9) on the top pressure plate (7). The bottom end of the limiting sleeve (8) is connected to an opening structure (10) for opening the mud discharge door (9).

2. The rotary drilling bit for forming cast-in-place piles according to claim 1, characterized in that: The top pressure plate (7) is provided with an installation groove (11) for embedding the mud discharge door (9). The mud discharge door (9) is connected to a force-bearing structure (12) on the side facing the opening structure (10) for being pushed by the opening structure (10) to move radially toward the drill barrel (1).

3. A rotary drilling bit for forming cast-in-place piles according to claim 2, characterized in that: The bottom of the door opening structure (10) is spherical.

4. A rotary drilling bit for forming cast-in-place piles according to claim 3, characterized in that: The force-bearing structure (12) is columnar. When the mud discharge gate (9) is closed, the top of the section of the force-bearing structure (12) located in the projection of the opening structure (10) along the axial direction of the drill barrel (1) is a convex cylindrical surface.

5. A rotary drilling bit for forming cast-in-place piles according to claim 2, characterized in that: The top surface of the top pressure plate (7) is concave funnel-shaped, and a mud discharge port (13) is provided through the middle of the top pressure plate (7). The width of the mud discharge port (13) is less than or equal to the width of the mud discharge gate (9).

6. A rotary drilling bit for forming cast-in-place piles according to claim 5, characterized in that: The top surface of the top pressure plate (7) is provided with a movable groove (14) for the movement of the force-bearing structure (12).

7. A rotary drilling bit for forming cast-in-place piles according to claim 2, characterized in that: There are two mud discharge gates (9), which are symmetrically arranged on the left and right sides of the opening structure (10).

8. A rotary drilling bit for forming cast-in-place piles according to claim 7, characterized in that: A reset spring (15) is provided between the mounting groove (11) and the mud discharge gate (9). The mud discharge gate (9) is provided with a spring cavity (16) for placing the reset spring (15). The mounting cavity is provided with a support rod (17) for embedding the reset spring (15).

9. A rotary drilling bit for forming cast-in-place piles according to claim 1, characterized in that: The top pressure plate (7) is connected to the top pressure rod (6) by bolts. The top pressure plate (7) is provided with a through hole (18) for the bolt to pass through and a countersunk platform (19) for placing the head of the bolt. The countersunk platform (19) is provided with a cover (20).

10. A rotary drilling bit for forming cast-in-place piles according to claim 1, characterized in that: The limiting sleeve (8) is provided with a through hole (21) for the pressure jacking pipe to pass through.

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