Rapid hole forming and grouting reinforcement integrated equipment for micro pile group

Abstract

The invention relates to micro pile group rapid hole forming and grouting reinforcement integrated equipment which comprises a drill rod and a drill bit which is rotationally connected to the lower portion of the drill rod and is driven by a built-in driving mechanism, and the top of the drill bit is fixedly connected with a sleeve annularly arranged on the surface of the drill rod in a sleeving mode. The surface of the sleeve is slidably connected with a lifting ring driven by a driving mechanism to ascend and descend, and the lifting ring and the sleeve are sealed through a sealing structure. According to the micro pile group rapid hole forming and grouting reinforcement integrated equipment, after drilling is completed, a lifting ring is driven by an extrusion cylinder to move downwards, an extrusion plate is pushed to stretch out in the radial direction and synchronously rotate to tamp the inner wall of a pile hole through cooperation of an abutting block and the inclined face of a guide block, the instant wall protecting effect is achieved, and hole collapse is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of micropile groups, and specifically to an integrated device for rapid hole formation and grouting reinforcement of micropile groups. Background Art

[0002] The construction technology of micropiles is widely used in engineering fields such as foundation reinforcement and slope support, but the existing technology has the following pain points:

[0003] Separation of processes and low efficiency: The traditional process requires hole formation first and then separate grouting for the retaining wall. The steps are cumbersome and the cycle is long. The drilled pile holes are prone to collapse due to the influence of groundwater or loose soil layers, and manual intervention for temporary support is required, increasing construction risks and costs.

[0004] Insufficient retaining wall effect: Conventional retaining wall methods (such as casing following or mud retaining wall) rely on external devices or materials. The equipment is complex and difficult to adapt to narrow spaces. The stability of the retaining wall is poor, and it is prone to failure especially in loose sandy soil or water-rich strata.

[0005] Single-function equipment: The drilling and grouting equipment are separated, and tools need to be frequently replaced, resulting in construction interruption. Moreover, the coordination between the grouting pipe and the drilling equipment is poor, and problems such as uneven grouting or slurry leakage are likely to occur.

[0006] Insufficient sealing and reliability: There is no dynamic sealing design between the drill pipe and the retaining wall mechanism, and the mud is likely to invade the interior of the equipment, resulting in component jamming or wear and reducing the service life of the equipment.

[0007] Although the existing technology has tried to integrate the drilling and grouting functions, the retaining wall structure is complex and the switching efficiency is low. There is an urgent need for an integrated device with a compact structure and a rapid switching between hole formation and retaining wall modes. Summary of the Invention

[0008] In view of the deficiencies of the existing technology, the present invention provides an integrated device for rapid hole formation and grouting reinforcement of micropile groups, which solves the problems mentioned above.

[0009] To achieve the above objectives, the present invention is realized through the following technical solutions: An integrated device for rapid hole formation and grouting reinforcement of micropile groups, including a drill pipe and a drill bit rotatably connected below the drill pipe and driven by an internal drive mechanism. The top of the drill bit is fixedly connected with a sleeve that is circumferentially sleeved on the surface of the drill pipe. The surface of the sleeve is slidably connected with a lifting ring that is driven to lift by a drive mechanism. The lifting ring and the sleeve are sealed by a sealing structure;

[0010] The inner cavity of the lifting ring is slidably connected with a guide block through an inner groove. The side of the guide block penetrates and extends to the outside of the lifting ring. A pressing plate is fixedly connected to the side of the guide block. The pressing plate and the side of the inner groove are sealed by an elastic sealing belt. An elastic telescopic rod is fixedly connected to the inner cavity of the lifting ring. The end of the elastic telescopic rod is fixedly connected to the side of the guide block. A butting block is fixedly connected to the top of the drill bit. A notch adapted to the butting block is formed at the bottom of the inner groove. A guiding section plane is formed on the side of the butting block. A guiding surface parallel to the guiding section plane is formed on the side of the guide block. An empty groove adapted to the telescopic section of the elastic telescopic rod is formed in the middle of the butting block. When drilling a hole during use, the drill rod is lowered through the drill rig and the hole is drilled by the drill bit. At this time, the pressing plate is in a contracted state and does not contact the inner wall of the pile hole. When grouting is required after drilling, the inside of the pile hole is in an unstable state and is prone to collapse at this time. At this time, the drill bit is rotated to a fixed angle, driving the positioning block to rotate under the extrusion cylinder. Then the extrusion cylinder moves to extrude the positioning block, driving the lifting ring to move downward on the sleeve. The bottom end of the piston rod of the extrusion cylinder is fixedly connected with a friction section. The detachable friction section rubs against the positioning block to ensure continuous pressure on the lifting ring. The lifting ring moves downward, driving the lower butting block to be inserted into the inner groove. The guiding section plane of the butting block contacts the guiding surface of the guide block, pushing the guide block to pull the elastic telescopic rod to move towards the outside of the lifting ring. At this time, the guide block drives the pressing plate to extend, and the pressing plate presses against the inner wall of the pile hole. The rotation of the drill bit drives the pressing plate to rotate synchronously, extruding the inner wall of the pile hole and tamping it to make its forming effect more stable. The rotatable pressing plate is integrally integrated above the drill bit. While rotating synchronously with it, it will not affect the normal operation of the drill bit, and there is no need for additional power drive inside the drill bit, which can effectively ensure the service life in harsh environments and can quickly switch between two working states.

[0011] As a further scheme of the present invention: Grouting pipes with grouting holes formed on the surfaces are fixedly connected to both sides of the drill rod. Grouting is carried out inside the micro-pile drilled by the drill bit through the grouting pipes.

[0012] As a further scheme of the present invention: The sealing structure includes an upper sealing belt fixedly arranged above the lifting ring and a lower sealing belt fixedly arranged below the lifting ring. The upper sealing belt is wrapped on the surface of the sleeve and is fixedly connected to the outer ring at the top of the sleeve. The lower sealing belt is sleeved on the surface of the drill bit and is fixedly connected to the outer ring at the top of the drill bit. Through the arrangement of the upper sealing belt and the lower sealing belt, effective sealing is carried out, and it will not be affected by the mud in the pile hole and will not interfere with the normal rotation of the drill bit.

[0013] As a further scheme of the present invention: The side of the pressing plate is arc-shaped, and the rotation trajectories of multiple pressing plates overlap to form a circle.

[0014] As a further solution of the present invention: The driving mechanism includes an extrusion cylinder fixed on the surface of the drill pipe. A positioning block adapted to the piston end of the extrusion cylinder is fixedly connected to the surface of the lifting ring. An inner groove is formed in the inner cavity of the positioning block to be adapted to the positioning of the piston rod end of the extrusion cylinder. When in use, the drill bit is rotated to a fixed angle, driving the positioning block to rotate under the extrusion cylinder. Then the extrusion cylinder moves to extrude the positioning block, driving the lifting ring to move downward on the sleeve. The bottom end of the piston rod of the extrusion cylinder is fixedly connected with a friction section. The lifting ring is continuously pressured by the friction between the detachable friction section and the positioning block.

[0015] As a further solution of the present invention: A plurality of guiding blocks and abutting blocks are provided, and they are arranged in a one-to-one correspondence up and down. The arrangement of multiple guiding blocks and abutting blocks can quickly switch the use state of the extrusion plate, and can quickly operate when shaft wall protection is required.

[0016] As a further solution of the present invention: When the extrusion plate moves outward to the limit, the inner diameter of the circle formed by the rotation trajectory is 1 cm larger than the diameter of the drill bit.

[0017] As a further solution of the present invention: The upper sealing strip, the lower sealing strip and the elastic sealing strip are all made of polyurethane material.

[0018] The present invention has the following beneficial effects compared with the prior art:

[0019] Seamless switching between hole forming and shaft wall protection:

[0020] Dynamic extrusion shaft wall protection: After the drilling is completed, the lifting ring is driven by the extrusion cylinder to move downward. Through the inclined surface cooperation between the abutting block and the guiding block, the extrusion plate is pushed to radially extend, and the inner wall of the pile hole is simultaneously rotated and tamped to form an immediate shaft wall protection effect and prevent the hole from collapsing.

[0021] Integrated structure: The shaft wall protection component is integrated above the drill bit, and the working mode can be switched without disassembling the drilling tool, shortening the construction period by more than 50%.

[0022] Efficient grouting and sealing guarantee:

[0023] Synchronous grouting reinforcement: Grouting pipelines are integrated on both sides of the drill pipe. After the hole is formed, the slurry is directly poured through the grouting holes. The slurry uniformly penetrates the soil layer along with the shaft wall tamping, improving the strength of the pile body.

[0024] Multiple sealing protections: The upper sealing strip, the lower sealing strip and the elastic sealing strip form a dynamic seal, isolating the intrusion of mud into the gap between the lifting ring and the sleeve, ensuring the long-term reliable operation of the equipment.

[0025] Compact structure and high adaptability:

[0026] Self-driven shaft wall protection mechanism: The extrusion plate is rotated and tamped by the rotation of the drill bit itself without an additional power source, simplifying the structure and reducing energy consumption.

[0027] Elastic adaptive design: The elastic telescopic rod and the reset mechanism enable the extrusion plate to automatically contract, adapt to different hole diameters and soil layer conditions, the diameter of the retaining wall can be adjusted, and it is compatible with the requirements of various pile types.

[0028] Durability and easy maintenance:

[0029] Application of wear-resistant materials: The polyurethane sealing belt is corrosion-resistant and wear-resistant, extending the sealing life; the friction section at the piston rod end of the extrusion cylinder can be replaced, reducing the maintenance cost.

[0030] Modular design: The guide blocks and the abutting blocks are grouped and corresponding, and local damage can be quickly replaced, reducing the downtime. Description of the drawings

[0031] Figure 1 It is a schematic structural diagram of the present invention;

[0032] Figure 2 It is a partial structural sectional view of the present invention;

[0033] Figure 3 It is the present invention Figure 2 The partial enlarged view at A in;

[0034] Figure 4 It is the bottom view of the structure of the lifting ring of the present invention;

[0035] Figure 5 It is the schematic structural diagram of the abutting block of the present invention.

[0036] In the figure: 1, drill pipe; 2, drill bit; 3, sleeve; 4, lifting ring; 5, elastic telescopic rod; 6, inner groove; 7, abutting block; 8, guiding section; 9, empty groove; 10, guide block; 11, extrusion plate; 12, elastic sealing belt; 13, guiding surface; 14, upper sealing belt; 15, lower sealing belt; 16, grouting pipeline; 17, extrusion cylinder. Detailed implementation manners

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0038] Please refer to Figures 1-5 , the present invention provides a technical solution: an integrated device for rapid hole formation and grouting reinforcement of a micro-pile group, including a drill pipe 1 and a drill bit 2 rotatably connected below the drill pipe 1 and driven by an internal drive mechanism. The top of the drill bit 2 is fixedly connected with a sleeve 3 circumferentially sleeved on the surface of the drill pipe 1. The surface of the sleeve 3 is slidably connected with a lifting ring 4 driven to lift by a drive mechanism. The lifting ring 4 and the sleeve 3 are sealed by a sealing structure;

[0039] The inner cavity of the lifting ring 4 is slidably connected with a guide block 10 through an inner groove 6. The side of the guide block 10 penetrates and extends to the outside of the lifting ring 4. A pressing plate 11 is fixedly connected to the side of the guide block 10. The pressing plate 11 and the side of the inner groove 6 are sealed by an elastic sealing belt 12. An elastic telescopic rod 5 is fixedly connected to the inner cavity of the lifting ring 4. The end of the elastic telescopic rod 5 is fixedly connected to the side of the guide block 10. A butting block 7 is fixedly connected to the top of the drill bit 2. A notch adapted to the butting block 7 is opened at the bottom of the inner groove 6. A guiding section plane 8 is opened on the side of the butting block 7. A guiding surface 13 parallel to the guiding section plane 8 is opened on the side of the guide block 10. An empty groove 9 adapted to the telescopic section of the elastic telescopic rod 5 is opened in the middle of the butting block 7. When drilling a hole during use, the drill rod 1 is lowered through a drilling rig and the hole is drilled through the drill bit 2. At this time, the pressing plate 11 is in a contracted state and does not contact the inner wall of the pile hole. When the hole drilling is completed and grouting is required, the inside of the pile hole is in an unstable state at this time and is prone to collapse. At this time, the drill bit 2 is rotated to a fixed angle, driving the positioning block to rotate under the extrusion cylinder 17. Then the extrusion cylinder 17 moves to extrude the positioning block, driving the lifting ring 4 to move downward on the sleeve 3. The bottom end of the piston rod of the extrusion cylinder 17 is fixedly connected with a friction section. The friction section is detachably used to friction with the positioning block to ensure continuous pressure on the lifting ring 4. The lifting ring 4 moves downward, driving the lower butting block 7 to be inserted into the inner groove 6. The guiding section plane 8 of the butting block 7 contacts the guiding surface 13 of the guide block 10, pushing the guide block 10 to pull the elastic telescopic rod 5 to move towards the outside of the lifting ring 4. At this time, the guide block 10 drives the pressing plate 11 to extend. The pressing plate 11 presses against the inner wall of the pile hole. The rotation of the drill bit 2 drives the pressing plate 11 to rotate synchronously, extruding the inner wall of the pile hole and tamping it, making its forming stability effect better. The rotatable pressing plate 11 is integrally integrated above the drill bit 2. While rotating synchronously with it, it will not affect the normal operation of the drill bit 2. And no additional power drive is required inside the drill bit 2, which can effectively ensure the service life in harsh environments and can quickly switch between two working states.

[0040] Grouting pipes 16 with grouting holes on their surfaces are fixedly connected to both sides of the drill rod 1. Grouting is carried out inside the micro-piles drilled by the drill bit 2 through the grouting pipes 16.

[0041] The sealing structure includes an upper sealing belt 14 fixedly arranged above the lifting ring 4 and a lower sealing belt 15 fixedly arranged below the lifting ring 4. The upper sealing belt 14 is wrapped on the surface of the sleeve 3 and is fixedly connected to the outer ring at the top of the sleeve 3. The lower sealing belt 15 is sleeved on the surface of the drill bit 2 and is fixedly connected to the outer ring at the top of the drill bit 2. Through the arrangement of the upper sealing belt 14 and the lower sealing belt 15, effective sealing is carried out, and it will not be affected by the mud in the pile hole and will not interfere with the normal rotation of the drill bit 2.

[0042] The side of the extrusion plate 11 is arc-shaped, and the rotation trajectories of multiple extrusion plates 11 overlap to form a circle.

[0043] The driving mechanism includes an extrusion cylinder 17 fixed on the surface of the drill pipe 1. A positioning block adapted to the piston end of the extrusion cylinder 17 is fixedly connected to the surface of the lifting ring 4. An inner groove is provided in the inner cavity of the positioning block to be adapted to the positioning of the piston rod end of the extrusion cylinder 17. When in use, the drill bit 2 is rotated to a fixed angle, driving the positioning block to rotate below the extrusion cylinder 17. Then, the extrusion cylinder 17 moves to squeeze the positioning block, driving the lifting ring 4 to move downward on the sleeve 3. The bottom end of the piston rod of the extrusion cylinder 17 is fixedly connected with a friction section, and the lifting ring 4 is continuously pressured by the friction between the detachable friction section and the positioning block.

[0044] A plurality of guide blocks 10 and abutting blocks 7 are provided, and they are arranged in a one-to-one correspondence up and down. With the arrangement of the plurality of guide blocks 10 and the abutting blocks 7, the use state of the extrusion plate 11 can be quickly switched, and the operation can be quickly carried out when the retaining wall needs to be constructed.

[0045] When the extrusion plate 11 moves outward to the limit, the inner diameter of the circle formed by the rotation trajectory is 1 cm larger than the diameter of the drill bit 2.

[0046] The upper sealing strip 14, the lower sealing strip 15 and the elastic sealing strip 12 are all made of polyurethane material.

[0047] Seamless switching between hole formation and retaining wall:

[0048] Dynamic extrusion retaining wall: After the drilling is completed, the lifting ring 4 is driven by the extrusion cylinder 17 to move downward. Through the cooperation of the abutting block 7 with the inclined surfaces 8 and 13 of the guide block 10, the extrusion plate 11 is pushed to radially extend, and the inner wall of the pile hole is synchronously rotated and tamped to form an immediate retaining wall effect to prevent the hole from collapsing.

[0049] Integrated structure: The retaining wall assembly is integrated above the drill bit 2, and the working mode can be switched without disassembling the drilling tool, shortening the construction period by more than 50%.

[0050] Efficient grouting and sealing guarantee:

[0051] Synchronous grouting reinforcement: Grouting pipes 16 are integrated on both sides of the drill pipe 1. After the hole is formed, the slurry is directly poured through the grouting holes. The slurry uniformly penetrates the soil layer along with the tamping of the retaining wall, improving the strength of the pile body.

[0052] Multiple sealing protections: The upper sealing strip 14, the lower sealing strip 15 and the elastic sealing strip 12 form a dynamic seal, isolating the intrusion of the slurry into the gap between the lifting ring 4 and the sleeve 3, ensuring the long-term reliable operation of the equipment.

[0053] Compact structure and high adaptability:

[0054] Self-driven retaining wall mechanism: The extrusion plate 11 is driven to rotate and ram by the rotation of the drill bit 2 itself, without the need for an additional power source, simplifying the structure and reducing energy consumption.

[0055] Elastic adaptive design: The elastic telescopic rod 5 and the reset mechanism enable the extrusion plate 11 to automatically contract, adapting to different hole diameters and soil layer conditions. The retaining wall diameter can be adjusted to exceed the drill bit diameter by 1 cm, compatible with the requirements of various pile types.

[0056] Durability and easy maintenance:

[0057] Application of wear-resistant materials: The sealing belt made of polyurethane material is corrosion-resistant and wear-resistant, extending the sealing life; the piston rod end of the extrusion cylinder 17 can be replaced with a friction section, reducing maintenance costs.

[0058] Modular design: The guide block 10 and the abutting block 7 are in group correspondence, and local damage can be quickly replaced, reducing downtime.

[0059] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An integrated device for rapid hole formation and grouting reinforcement of a micro-pile group, comprising a drill pipe (1) and a drill bit (2) rotatably connected below the drill pipe (1) and driven by a built-in driving mechanism, characterized in that: A sleeve (3) is fixedly connected to the top of the drill bit (2) and is circumferentially sleeved on the surface of the drill pipe (1). A lifting ring (4) driven by a driving mechanism to lift is slidably connected to the surface of the sleeve (3), and the lifting ring (4) and the sleeve (3) are sealed by a sealing structure. A guiding block (10) is slidably connected to the inner cavity of the lifting ring (4) through an inner groove (6). The side of the guiding block (10) penetrates and extends to the outside of the lifting ring (4). A pressing plate (11) is fixedly connected to the side of the guiding block (10). The pressing plate (11) and the side of the inner groove (6) are sealed by an elastic sealing belt (12). An elastic telescopic rod (5) is fixedly connected to the inner cavity of the lifting ring (4). The end of the elastic telescopic rod (5) is fixedly connected to the side of the guiding block (10). A butting block (7) is fixedly connected to the top of the drill bit (2). A notch adapted to the butting block (7) is formed at the bottom of the inner groove (6). A guiding section plane (8) is formed on the side of the butting block (7). A guiding surface (13) parallel to the guiding section plane (8) is formed on the side of the guiding block (10). An empty groove (9) adapted to the telescopic section of the elastic telescopic rod (5) is formed in the middle of the butting block (7).

2. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 1, characterized in that: Grouting pipes (16) with grouting holes formed on the surfaces are fixedly connected to both sides of the drill pipe (1).

3. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 1, characterized in that: The sealing structure includes an upper sealing belt (14) fixedly arranged above the lifting ring (4) and a lower sealing belt (15) fixedly arranged below the lifting ring (4). The upper sealing belt (14) covers the surface of the sleeve (3) and is fixedly connected to the outer ring at the top end of the sleeve (3). The lower sealing belt (15) is sleeved on the surface of the drill bit (2) and is fixedly connected to the outer ring at the top end of the drill bit (2).

4. The integrated equipment for rapid hole formation and grouting reinforcement of a micro-pile group according to claim 1, characterized in that: The side of the pressing plate (11) is arc-shaped, and the overlapping rotation trajectories of a plurality of pressing plates (11) form a circle.

5. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 1, characterized in that: The driving mechanism includes an extrusion cylinder (17) fixedly arranged on the surface of the drill pipe (1). A positioning block adapted to the piston end of the extrusion cylinder (17) is fixedly connected to the surface of the lifting ring (4). An inner groove is formed in the inner cavity of the positioning block to be adapted to the positioning of the piston rod end of the extrusion cylinder (17).

6. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 1, characterized in that: A plurality of guiding blocks (10) and butting blocks (7) are provided, and they are arranged in a one-to-one correspondence up and down.

7. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 1, characterized in that: When the pressing plate (11) moves outwards to the limit, the inner diameter of the circle formed by the rotation trajectory is 1 cm larger than the diameter of the drill bit (2).

8. The integrated equipment for rapid hole formation and grouting reinforcement of a micropile group according to claim 3, characterized in that: The upper sealing belt (14), the lower sealing belt (15) and the elastic sealing belt (12) are all made of polyurethane material.

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