Auxiliary device for rotary drilling of water-rich sandy gravel layer bridge pile foundation

Abstract

The utility model belongs to the technical field of bridge pile foundations, particularly relates to a rotary drilling auxiliary device for a bridge pile foundation in a water-rich sandy gravel layer, and provides the following scheme aiming at the problem that an existing rotary drilling rig does not have a proper device for treating water seepage and collapse in a drilled hole during drilling: the rotary drilling auxiliary device comprises a belt vehicle, a control box is arranged at the top of the belt vehicle, a power source and a controller are arranged in the control box, an angle adjusting mechanism is arranged at the front end of the belt vehicle, a drilling propelling mechanism is connected to the angle adjusting mechanism, and a rotary excavating mechanism is connected to the drilling propelling mechanism. In the rotary excavating process, the hydraulic rod is used for driving the arc-shaped extrusion plate to extrude the inner wall of a drill hole and conduct annular movement to trowell the inner wall, the stability of the inner wall of the drill hole can be improved, the probability of collapse of the inner wall is reduced, seepage water of the drill hole can be pumped out and discharged through work of the negative pressure pump, soaking of the seepage water of the drill hole is reduced, and the drilling efficiency is improved. The inner wall is further prevented from collapsing.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge pile foundations, in particular to a rotary drilling auxiliary device for bridge pile foundations in a water-rich sand and gravel layer. Background Art

[0002] The water-rich sand and gravel layer mainly concentrates water and a large amount of sand and gravel. It is difficult to perform rotary drilling in the water-rich sand and gravel layer. The main purpose is to prevent water seepage and collapse in the hole. Usually, a rotary drilling rig is used for drilling. Rotary drilling rigs have been widely used in construction at home and abroad due to their high efficiency, less pollution and full functions. It is a construction machinery suitable for hole-forming operations in building foundation projects.

[0003] The patent document with announcement number CN112377093A discloses a rotary drilling construction method involving deep concrete blocks and gravel layers and a special rotary drilling equipment. Different drill bits can be replaced according to different geology and different construction purposes, so that the drilled holes can effectively penetrate the unfavorable geological layers.

[0004] In the prior art, when a rotary drilling machine drills a water-rich sand and gravel layer, an auxiliary device is required to prevent water seepage and collapse inside the borehole. However, the existing rotary drilling rig does not have a suitable device to handle water seepage and collapse inside the borehole when drilling. Utility Model Content

[0005] The utility model aims to solve the shortcoming that the existing rotary drilling rig has no suitable device to deal with water seepage and collapse inside the borehole when drilling, and proposes a rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer comprises a belt cart. A control box is arranged on the top of the belt cart. A power supply and a controller are arranged inside the control box. An angle adjustment mechanism is arranged at the front end of the belt cart. A drilling propulsion mechanism is connected to the angle adjustment mechanism. A rotary drilling mechanism is connected to the drilling propulsion mechanism.

[0008] Preferably, the angle adjustment mechanism includes a hinge and a hydraulic cylinder; the hydraulic cylinder pushes the drilling propulsion mechanism to flip via the hinge, thereby adjusting the vertical angle of the drilling propulsion mechanism and further adjusting the drilling angle.

[0009] Preferably, the drilling advancement mechanism includes a slide rail, which is rotatably installed on the front end of the belt truck through a hinge and a hydraulic cylinder, a threaded rod is rotatably installed in the slide rail, the outer side of the threaded rod is threadedly connected with a vertical block, the vertical block is slidably installed in the slide rail, and a stepper motor is installed on the top of the slide rail, and the output shaft of the stepper motor is fixedly installed on the threaded rod; the stepper motor drives the threaded rod to rotate, and the threaded rod drives the vertical block to adjust the height, thereby driving the rotary drilling mechanism to advance rotary drilling.

[0010] Preferably, the rotary drilling mechanism includes a rectangular box, which is fixedly installed on the vertical block, and a hollow rod is vertically rotatably installed on the rectangular box through a sealed bearing, and a water outlet hole is opened on the part of the hollow rod located in the rectangular box, and the rectangular box is connected to a pipe, and the pipe is connected to a negative pressure water pump; when the negative pressure water pump is working, the inside of the rectangular box is in a negative pressure vacuum state through the pipe.

[0011] Preferably, a rotary drilling spiral blade is provided on the outer side of the hollow rod below the rectangular box, a cone head is provided at the bottom end of the hollow rod, a plurality of water suction holes are opened on the outer side of the hollow rod near the cone head, and metal meshes are fixed on the outer sides of the plurality of water suction holes by screws; the hollow rod is connected with the rectangular box through the water outlet hole, and the water inlet hole on the hollow rod can suck the drilled water into the rectangular box, and then discharge it through the pipeline and the negative pressure water pump, thereby reducing the degree of drilled water seepage, and the arranged metal mesh can play a filtering role when pumping water to prevent soil from entering the hollow rod.

[0012] Preferably, a hydraulic rod is installed on the outside of the hollow rod, and an arc-shaped extrusion plate is fixedly installed on the outside of the hydraulic rod, and both ends of the arc-shaped extrusion plate are provided with inclined surfaces; the hydraulic rod drives the arc-shaped extrusion plate to squeeze the inner wall of the borehole, and makes a circular motion to smooth the inner wall, which can improve the stability of the inner wall of the borehole and reduce the probability of inner wall collapse.

[0013] Preferably, a distribution box is installed on the top of the rectangular box, and a driving unit for providing rotary drilling power to the hollow rod is arranged in the distribution box. The driving unit includes a servo motor, a first gear and a second gear. The servo motor is installed inside the distribution box, and the first gear is installed on the output shaft of the servo motor. The outer side of the hollow rod is provided with a second gear, and the first gear is meshed with the second gear; the servo motor drives the hollow rod to rotate through the first gear and the second gear.

[0014] Compared with the prior art, the advantages of the utility model are:

[0015] In this solution, the stepper motor drives the threaded rod to rotate, the threaded rod drives the vertical block to adjust the height, the vertical block drives the hollow rod to move downward through the rectangular box, the servo motor drives the hollow rod to rotate through the first gear and the second gear, the hollow rod drives the rotary excavation spiral blade to rotate, the hollow rod drives the rotary excavation spiral blade to drill, during the rotary excavation process, the hydraulic rod drives the arc extrusion plate to squeeze the inner wall of the borehole, and the circular motion is performed to smooth the inner wall, which can improve the stability of the inner wall of the borehole and reduce the probability of inner wall collapse;

[0016] The negative pressure water pump of this scheme works, and makes the rectangular box in a negative pressure vacuum state through the pipeline, and is connected with the rectangular box through the water outlet hole. The water inlet hole on the hollow rod can suck the drilling water into the rectangular box, and then discharge it through the pipeline and the negative pressure water pump, thereby reducing the drilling water seepage degree, reducing the immersion of the seepage water, and further preventing the collapse of the inner wall;

[0017] During the rotary drilling process of the utility model, a hydraulic rod is used to drive an arc-shaped extrusion plate to squeeze the inner wall of the borehole, and a circular motion is performed to smooth the inner wall, which can improve the stability of the inner wall of the borehole and reduce the probability of inner wall collapse. By using a negative pressure pump, seepage water in the borehole can be pumped out and discharged, reducing the immersion of seepage water in the borehole and further preventing the collapse of the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer proposed by the utility model;

[0019] Figure 2 This is a schematic structural diagram of part A of a rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer proposed by the utility model;

[0020] Figure 3 This is a schematic structural diagram of part B of a rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer proposed by the utility model;

[0021] Figure 4 This is a three-dimensional structural schematic diagram of the hollow rod, rotary excavator spiral blade and arc-shaped extrusion plate proposed in the utility model;

[0022] Figure 5 This is a three-dimensional structural schematic diagram of the hydraulic rod and the arc-shaped extrusion plate proposed by the utility model.

[0023] In the figure: 1. belt car; 11. hinge; 12. hydraulic cylinder; 2. control box; 3. drilling propulsion mechanism; 31. slide rail; 32. threaded rod; 33. vertical block; 34. stepping motor; 4. rotary drilling mechanism; 41. rectangular box; 42. hollow rod; 421. metal mesh; 422. cone head; 43. rotary drilling spiral blade; 44. water outlet; 45. pipeline; 46. negative pressure water pump; 47. distribution box; 48. drive unit; 481. servo motor; 482. first gear; 483. second gear; 491. hydraulic rod; 492. arc extrusion plate; 493. inclined plane. DETAILED DESCRIPTION

[0024] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all of the embodiments.

[0025] Reference Figure 1-5 A rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer comprises a belt cart 1. A control box 2 is arranged on the top of the belt cart 1. A power supply and a controller are arranged inside the control box 2. An angle adjustment mechanism is arranged at the front end of the belt cart 1. A drilling propulsion mechanism 3 is connected to the angle adjustment mechanism. A rotary drilling mechanism 4 is connected to the drilling propulsion mechanism 3. The angle adjustment mechanism comprises a hinge 11 and a hydraulic cylinder 12. The hydraulic cylinder 12 pushes the drilling propulsion mechanism 3 to flip by relying on the hinge 11, so as to adjust the vertical angle of the drilling propulsion mechanism 3 and then adjust the drilling angle.

[0026] In this embodiment, the drilling advancement mechanism 3 includes a slide rail 31, which is rotatably installed at the front end of the belt car 1 through a hinge 11 and a hydraulic cylinder 12. A threaded rod 32 is rotatably installed in the slide rail 31, and a vertical block 33 is threadedly connected to the outer side of the threaded rod 32. The vertical block 33 is slidably installed in the slide rail 31. A stepper motor 34 is installed on the top of the slide rail 31, and the output shaft of the stepper motor 34 is fixedly installed on the threaded rod 32; the stepper motor 34 drives the threaded rod 32 to rotate, and the threaded rod 32 drives the vertical block 33 to adjust the height, thereby promoting the rotary drilling mechanism 4 to advance rotary drilling.

[0027] In this embodiment, the rotary drilling mechanism 4 includes a rectangular box 41, which is fixedly installed on the vertical block 33. A hollow rod 42 is vertically rotatably installed on the rectangular box 41 through a sealed bearing. A water outlet 44 is provided on the part of the hollow rod 42 located in the rectangular box 41. A pipe 45 is connected to the rectangular box 41, and a negative pressure water pump 46 is connected to the pipe 45. When the negative pressure water pump 46 is working, the inside of the rectangular box 41 is in a negative pressure vacuum state through the pipe 45.

[0028] In this embodiment, the outer part of the hollow rod 42 located below the rectangular box 41 is provided with a rotary drilling spiral blade 43, and the bottom end of the hollow rod 42 is provided with a cone head 422. A plurality of water suction holes are opened on the outer side of the hollow rod 42 near the cone head 422, and metal meshes 421 are fixed on the outer sides of the plurality of water suction holes by screws; the hollow rod 42 is connected with the rectangular box 41 through the water outlet hole 44, and the water inlet hole on the hollow rod 42 can suck the water seepage from the borehole into the rectangular box 41, and then discharge it through the pipe 45 and the negative pressure water pump 46, thereby reducing the degree of water seepage from the borehole. The provided metal mesh 421 can play a filtering role when pumping water to prevent soil from entering the hollow rod 42.

[0029] In this embodiment, a hydraulic rod 491 is installed on the outside of the hollow rod 42, and an arc-shaped extrusion plate 492 is fixedly installed on the outside of the hydraulic rod 491. Both ends of the arc-shaped extrusion plate 492 are provided with inclined surfaces 493; the hydraulic rod 491 drives the arc-shaped extrusion plate 492 to squeeze the inner wall of the borehole, and makes a circular motion to smooth the inner wall, which can improve the stability of the inner wall of the borehole and reduce the probability of inner wall collapse.

[0030] In this embodiment, a distribution box 47 is installed on the top of the rectangular box 41, and a drive unit 48 for providing rotary drilling power to the hollow rod 42 is arranged in the distribution box 47. The drive unit 48 includes a servo motor 481, a first gear 482 and a second gear 483. The servo motor 481 is installed inside the distribution box 47, and the first gear 482 is installed on the output shaft of the servo motor 481. The outer side of the hollow rod 42 is provided with a second gear 483, and the first gear 482 is meshed with the second gear 483; the servo motor 481 drives the hollow rod 42 to rotate through the first gear 482 and the second gear 483.

[0031] Working principle: when in use, turn on the power supply and controller, the belt car 1 can move automatically, which is the existing technology and will not be described in detail here. The stepper motor 34 drives the threaded rod 32 to rotate, and the threaded rod 32 drives the vertical block 33 to adjust the height. The vertical block 33 drives the hollow rod 42 to move downward through the rectangular box 41. The servo motor 481 drives the hollow rod 42 to rotate through the first gear 482 and the second gear 483. The hollow rod 42 drives the rotary digging spiral blade 43 to rotate, and the hollow rod 42 drives the rotary digging spiral blade 43 to drill. During the rotary digging process, the hydraulic rod 491 drives the arc-shaped extrusion plate 492 to squeeze the inner wall of the drilled hole, making a circular motion to squeeze the inner wall. Smoothing the wall can improve the stability of the inner wall of the borehole and reduce the probability of inner wall collapse. If water seepage occurs, the negative pressure water pump 46 works to make the rectangular box 41 in a negative pressure vacuum state through the pipe 45, and is connected to the rectangular box 41 through the water outlet 44. The water inlet hole on the hollow rod 42 can suck the water seeping from the borehole into the rectangular box 41, and then discharge it through the pipe 45 and the negative pressure water pump 46, thereby reducing the degree of water seepage from the borehole, reducing the immersion of the seepage water, and further preventing the collapse of the inner wall. All structures in the present application can be selected in terms of material and length according to actual usage. The accompanying drawings are all schematic structural diagrams, and the specific actual dimensions can be appropriately adjusted.

[0032] The above is only a preferred specific implementation of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of this embodiment within the technical scope disclosed in this embodiment, which should be covered by the protection scope of this embodiment.

Claims

1. A rotary drilling auxiliary device for bridge pile foundation in a water-rich sand and gravel layer, comprising a belt truck (1), a control box (2) is arranged on the top of the belt truck (1), a power supply and a controller are arranged inside the control box (2), and the characteristics are as follows: The front end of the belt vehicle (1) is provided with an angle adjustment mechanism, the angle adjustment mechanism is connected to a drilling propulsion mechanism (3), and the drilling propulsion mechanism (3) is connected to a rotary drilling mechanism (4).

2. The rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer according to claim 1 is characterized in that: The angle adjustment mechanism comprises a hinge (11) and a hydraulic cylinder (12).

3. The rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer according to claim 1 is characterized in that: The drilling propulsion mechanism (3) comprises a slide rail (31), and the slide rail (31) is rotatably mounted on the front end of the belt vehicle (1) via a hinge (11) and a hydraulic cylinder (12).

4. The rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer according to claim 3 is characterized in that: A threaded rod (32) is rotatably mounted in the slide rail (31), a vertical block (33) is threadedly connected to the outer side of the threaded rod (32), and the vertical block (33) is slidably mounted in the slide rail (31). A stepper motor (34) is mounted on the top of the slide rail (31), and an output shaft of the stepper motor (34) is fixedly mounted on the threaded rod (32).

5. The rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer according to claim 4 is characterized in that: The rotary drilling mechanism (4) comprises a rectangular box (41), the rectangular box (41) is fixedly mounted on the vertical block (33), a hollow rod (42) is vertically rotatably mounted on the rectangular box (41) via a sealed bearing, a water outlet hole (44) is provided on the portion of the hollow rod (42) located in the rectangular box (41), the rectangular box (41) is connected to a pipeline (45), and the pipeline (45) is connected to a negative pressure water pump (46).

6. The auxiliary device for rotary drilling of bridge pile foundation in water-rich sand and gravel layer according to claim 5 is characterized in that: The outer portion of the hollow rod (42) located below the rectangular box (41) is provided with a rotary excavation spiral blade (43), the bottom end of the hollow rod (42) is provided with a cone head (422), and a plurality of water absorption holes are provided on the outer side of the hollow rod (42) near the cone head (422), and metal meshes (421) are fixedly installed on the outer sides of the plurality of water absorption holes by screws.

7. The auxiliary device for rotary drilling of bridge pile foundation in water-rich sand and gravel layer according to claim 5 is characterized in that: A hydraulic rod (491) is installed on the outer side of the hollow rod (42), and an arc-shaped extrusion plate (492) is fixedly installed on the outer side of the hydraulic rod (491), and both ends of the arc-shaped extrusion plate (492) are provided with inclined surfaces (493).

8. The rotary drilling auxiliary device for bridge pile foundation in water-rich sand and gravel layer according to claim 5 is characterized in that: A power distribution box (47) is installed on the top of the rectangular box (41), and a driving unit (48) for providing rotary drilling power to the hollow rod (42) is arranged inside the power distribution box (47). The driving unit (48) comprises a servo motor (481), a first gear (482) and a second gear (483). The servo motor (481) is installed inside the power distribution box (47), and the first gear (482) is installed on the output shaft of the servo motor (481). The second gear (483) is sleeved on the outer side of the hollow rod (42), and the first gear (482) is meshed with the second gear (483).

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