Rotary excavating device for PC pile rotary excavating

Abstract

The invention discloses a rotary excavating device for PC pile rotary excavating, which comprises a support rod, one side of the support rod is provided with two protruding parts with opposite positions, the two protruding parts are internally and rotatably provided with a screw rod, the screw rod is rotatably sleeved with a sliding seat in sliding connection with the support rod in a threaded manner, one side of the sliding seat is provided with a connecting plate, and the connecting plate is provided with a connecting rod. A drill bit is arranged at the lower end of the drill rod, the drill bit comprises a drill bit body with the interior being hollow and the upper end and the lower end being open, and a plurality of inclined drill bits which are annularly distributed with the lower end opening of the drill bit body as the circle center are arranged at the lower end of the drill bit body; the multiple inclined drill bits incline towards the position close to the center of the drill bit body, a rotating connector is arranged at the upper end of the drill rod, and the rotating connector is provided with a first conveying pipe used for conveying cement slurry. The drilling device has the beneficial effects that cement slurry is injected into a drilled hole while drilling is conducted, cement and original soil in the hole are fully mixed, and the drilling stability is improved.

Description

Technical Field

[0001] The present invention relates to the field of foundation construction, and specifically to a rotary drilling device for PC pile rotary drilling. Background Art

[0002] PC piles (pipe piles) generally refer to prestressed concrete pipe piles (pile foundation types). Reinforced concrete prestressed pipe piles, also known as precast concrete piles, are precast in a precast component processing factory, cured, transported to the construction site after reaching the design strength, driven into the soil with a pile driver, and then a bearing platform beam (slab) foundation is poured on the top of the pile. The concrete grade used for reinforced concrete precast piles should not be lower than 300#. The diameter of the stressed steel bars of the pile should not be less than 12 mm, and generally 4 - 8 main steel bars are arranged. In order to resist hammering and penetrate the soil layer, the stirrups should be densified at the top and tip of the pile, and the main steel bars at the pile tip should be bent up and welded to a core rod. Reinforced concrete precast piles have the advantages of simple production, high strength, large rigidity, and can be made into various cross-sectional shapes, and are a widely used pile type.

[0003] In the existing PC pile process, before embedding, it is necessary to drill the foundation. After drilling is completed, cement slurry is injected into the hole to fill the entire hole, and then the PC pile is placed into the hole. However, since the drilling and cement slurry injection are two separate steps in this process, the entire cement slurry and the original soil in the drilling hole are not fully mixed, and the entire drilling structure is not stable. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a rotary drilling device for PC pile rotary drilling, which combines the two steps of drilling and injecting cement slurry, realizes drilling while injecting cement slurry into the drilling hole, enables the cement to be fully mixed with the original soil in the hole, and improves the stability of the drilling.

[0005] The purpose of the present invention is achieved by the following technical solutions: A rotary drilling device for PC pile rotary drilling, including a support rod, two opposite protruding parts are arranged on one side of the support rod, a lead screw is rotatably arranged in the two protruding parts, a sliding seat slidably connected to the support rod is threadedly sleeved on the lead screw, a connecting plate is arranged on one side of the sliding seat, a drill rod with a hollow interior and open upper and lower ends is rotatably sleeved on the connecting plate, a drill bit is arranged at the lower end of the drill rod, the drill bit includes a drill bit body with a hollow interior and open upper and lower ends, a plurality of inclined drill bits annularly distributed with the lower end opening of the drill bit body as the center are arranged at the lower end of the drill bit body, and the plurality of inclined drill bits incline towards the center of the drill bit body. A rotary joint is arranged at the upper end of the drill rod, and the rotary joint is provided with a first conveying pipe for conveying cement slurry.

[0006] It also includes a crane. A load-bearing platform is arranged on one side of the crane close to the support rod. The load-bearing platform is rotatably connected to the lower end of the support rod. A hydraulic telescopic rod is hinged on the crane, and the hydraulic telescopic rod is rotatably connected to one end of the support rod.

[0007] Tooth plates are arranged on both sides of the drill bit body.

[0008] A cutting plate is arranged on the side wall of the lower end of the drill bit body, and a plurality of cutting heads are arranged on the cutting plate.

[0009] A motor is arranged on the support rod. The output end of the motor is connected with a first gear. The two ends of the first gear are respectively meshed with a second gear for conveying cement slurry and a third gear for driving the screw rod and the drill rod to rotate.

[0010] A conveying channel is formed on the protruding part relatively close to the drill rod. Both ends of the conveying channel are open. A conveying impeller is arranged in the conveying channel. A fourth gear is rotatably arranged inside the support rod. The fourth gear is in transmission connection with the second gear. A fifth gear is meshed on one side of the fourth gear. The fifth gear is connected with the conveying impeller through a first connecting rod.

[0011] An electric telescopic rod is arranged on the second gear. The end of the electric telescopic rod is detachably connected with the fourth gear.

[0012] A synchronous groove is formed on the fourth gear. The end of the electric telescopic rod is provided with a synchronous tooth matched with the synchronous groove.

[0013] A transmission rod is arranged on the third gear. A first sprocket is fixedly sleeved on the transmission rod. The first sprocket is in chain transmission connection with a second sprocket. The second sprocket is connected with the screw rod. A sixth gear is arranged at the end of the transmission rod. A seventh gear is meshed on one side of the sixth gear. The seventh gear is connected with an eighth gear through a second connecting rod. A ninth gear is meshed on one side of the eighth gear. The ninth gear is slidably sleeved on the drill rod and is rotatably connected with the protruding part.

[0014] A through hole matched with the shape and size of the drill rod is formed on the ninth gear. Limit through grooves are formed at both ends of the through hole. Limit parts corresponding to the shape, size and position of the limit through grooves are arranged at both ends of the drill rod.

[0015] The beneficial effects of the present invention are as follows: By arranging a drill rod and a drill bit body with a hollow interior and open upper and lower ends, when the drill bit body performs rotary excavation work, the injected cement slurry can be ejected from the lower end of the drill bit body, realizing injecting material while drilling, so that the cement slurry and the original soil in the drill hole are combined, improving the structural stability of the drill hole.

[0016] By arranging a cutting plate, a toothed plate, etc. on the periphery of the drilling body, the drilling difficulty is reduced, and at the same time, the cement slurry and the original soil in the drilling are further fully mixed.

[0017] By arranging a second gear and a third gear, one motor is enabled to drive the drill bit body to drill and inject cement slurry simultaneously.

[0018] By arranging an electric telescopic rod, when the drill bit is only moving up and down without drilling, the cement slurry is prevented from spraying out of the drill bit body. Description of the Drawings

[0019] Figure 1 Schematic diagram of the present invention; Figure 2 is Figure 1 Enlarged view of part A in Figure 3 Cross-sectional view of the drill bit; Figure 4 Schematic connection diagram of the limit through groove; Reference numerals: 1, support rod; 2, protrusion; 3, lead screw; 4, sliding seat; 5, connecting plate; 6, drill pipe; 7, drill bit body; 8, inclined drill bit; 9, rotary joint; 10, crane; 11, load-bearing platform; 12, hydraulic telescopic rod; 13, toothed plate; 14, cutting plate; 15, cutting head; 16, motor; 17, first gear; 18, second gear; 19, third gear; 20, conveying channel; 21, conveying impeller; 22, fourth gear; 23, fifth gear; 24, first connecting rod; 25, electric telescopic rod; 26, synchronous teeth; 27, transmission rod; 28, first sprocket; 29, chain; 30, second sprocket; 31, sixth gear; 32, seventh gear; 33, second connecting rod; 34, eighth gear; 35, ninth gear; 36, through hole; 37, limit through groove; 38, limiting part; 39, drill bit. Detailed Description of the Invention

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the orientation concepts of "left", "right", "up", "down", "front", "back", "inside", and "outside" in the following solutions are all relative directions, and will not be listed one by one here.

[0022] A rotary drilling device for PC pile rotary drilling, refer to Figures 1 - 4, including a crane 10 and a support rod 1 with a hollow interior. A load-bearing platform 11 is provided on the front side of the crane 10. The load-bearing platform 11 is rotatably connected to the lower right side of the support rod 1. A hydraulic telescopic rod 12 is rotatably arranged on the crane 10, and the upper end of the hydraulic telescopic rod 12 is rotatably connected to the middle right side of the support rod 1.

[0023] Two protruding parts 2 are arranged on the left side of the support rod 1. The right half of the protruding part 2 is hollow inside and communicates with the inside of the support rod 1. A lead screw 3 is rotatably arranged between the two protruding parts 2. A sliding seat 4 is threadedly sleeved on the lead screw 3. The sliding seat 4 is slidably connected to the left side of the support rod 1. A connecting plate 5 is arranged on the left side of the sliding seat 4, and a drill rod 6 is rotatably sleeved on the connecting plate 5. The lower end of the drill rod 6 rotates and slidably passes through the protruding part 2 and the end is provided with a drill bit 39. The drill rod 6 is hollow inside with upper and lower ports. A rotary joint 9 is arranged at the upper end of the drill rod 6.

[0024] The drill bit 39 includes a drill bit body 7 with a hollow interior and upper and lower openings. The inside of the drill bit body 7 communicates with the inside of the drill rod 6. Three inclined drill bits 8 are arranged at the lower end of the drill bit body 7, which are evenly distributed in a ring with the axis of the drill bit body 7 as the center. The inclined drill bits 8 are inclined from the end far from the axis of the drill bit body 7 towards the end close to the axis of the drill bit body 7, and the inclination angle is 45°. Two toothed plates 13 are arranged on both sides of the drill bit body 7. A cutting plate 14 is arranged on the lower left side of the drill bit 7 body, and a plurality of cutting heads 15 are arranged on the cutting plate 14.

[0025] An L-shaped conveying channel 20 is opened at the upper protruding part 2. The left end and the lower end of the conveying channel 20 are open. The lower end of the conveying channel 20 is connected to the rotary joint 9 through a flexible and bendable first conveying pipe. The left end of the conveying channel 20 is communicated with a storage tank for storing cement slurry arranged on the crane. A conveying impeller 21 is rotatably arranged in the conveying channel 20. When the conveying impeller 21 rotates, the cement slurry in the storage tank is driven by the conveying impeller 21 and sprayed out from the lower end of the drill bit body 7.

[0026] A motor 16 is arranged on the right side of the support rod 1. The output end of the motor 16 is located inside the support rod 1, and a first gear 17 is arranged at the output end. The first gear 17 meshes with a second gear 18 and a third gear 19 on the upper and lower sides. A fourth gear 22 parallel to the second gear 18 and located directly above it is rotatably arranged inside the support rod 1. An electric telescopic rod 25 is arranged on the second gear 18. A synchronous tooth 26 is arranged at the upper end of the electric telescopic rod 25. A synchronous groove matching the synchronous tooth 26 is opened at the lower end of the fourth gear 22. When the synchronous tooth 26 is inserted into the synchronous groove, the electric telescopic rod 25 is rigidly connected to the fourth gear 22. A fifth gear 23 meshes with one side of the fourth gear 22, and the fifth gear 23 is connected to the conveying impeller 21 through a first connecting rod 24.

[0027] A transmission rod 27 is provided at the lower end of the third gear 19. A first sprocket 28 is fixedly sleeved on the transmission rod 27. The first sprocket 28 is drivingly connected to a second sprocket 30 through a chain 29. The second sprocket 30 is connected to the lead screw 3. A sixth gear 31 is provided at the lower end of the transmission rod 27. A seventh gear 32 is meshed with one side of the sixth gear 31. A second connecting rod 33 is provided on the seventh gear 32. An eighth gear 34 is provided at the end of the second connecting rod 33. A ninth gear 35 is meshed with one side of the eighth gear 34. The ninth gear 35 is rotatably connected to the protruding portion 2 at the lower end and is slidably sleeved on the drill rod 6.

[0028] A through hole 36 matching the size and shape of the drill rod 6 is formed in the ninth gear 35. Limit through grooves 37 are formed at both ends of the through hole 36. Limit portions 38 matching the shape, quantity, position and size of the limit through grooves 37 are provided on the circumferential side of the drill rod 6. The drill rod 6 is arranged through the ninth gear 35, and the limit portions 38 are slidably installed at the positions matching the limit through grooves 37.

[0029] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above description or the technology or knowledge in the relevant field. And the changes and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A rotary drilling device for PC pile rotary drilling, comprising a support rod. On one side of the support rod, there are two protruding parts opposite to each other. A lead screw is rotatably arranged in the two protruding parts. A sliding seat slidably connected to the support rod is threadedly sleeved on the lead screw. A connecting plate is arranged on one side of the sliding seat, and it is characterized in that, A drill pipe with a hollow interior and open upper and lower ends is rotatably sleeved on the connecting plate. A drill bit is provided at the lower end of the drill pipe. The drill bit includes a drill bit body with a hollow interior and open upper and lower ends. A plurality of inclined drill bits are provided at the lower end of the drill bit body, which are annularly distributed with the lower opening of the drill bit body as the center. The plurality of inclined drill bits are inclined towards the center of the drill bit body. A rotary joint is provided at the upper end of the drill pipe, and the rotary joint is provided with a first conveying pipe for conveying cement slurry.

2. The rotary drilling device for PC piles according to claim 1, characterized in that: It further includes a crane. A load-bearing platform is provided on one side of the crane close to the support rod. The load-bearing platform is rotatably connected to the lower end of the support rod. A hydraulic telescopic rod is hinged on the crane, and the hydraulic telescopic rod is rotatably connected to one end of the support rod.

3. The rotary drilling device for PC pile rotary drilling according to claim 1, characterized in that: Tooth plates are provided on both sides of the drill bit body.

4. A rotary drilling device for PC pile rotary drilling according to claim 1, characterized in that: A cutting plate is provided on the side wall of the lower end of the drill bit body, and a plurality of cutting heads are provided on the cutting plate.

5. The rotary drilling device for PC pile rotary drilling according to claim 1, characterized in that: A motor is provided on the support rod. The output end of the motor is connected to a first gear. A second gear for conveying cement slurry and a third gear for driving the screw rod and the drill pipe to rotate are respectively meshed at both ends of the first gear.

6. The rotary drilling device for PC pile rotary drilling according to claim 5, wherein: A conveying channel is opened on the protruding part relatively close to the drill pipe. The conveying channel has open ends at both ends. A conveying impeller is provided in the conveying channel. A fourth gear is rotatably provided inside the support rod. The fourth gear is in transmission connection with the second gear. A fifth gear is meshed on one side of the fourth gear. The fifth gear is connected to the conveying impeller through a first connecting rod.

7. The rotary drilling device for PC pile rotary drilling according to claim 6, characterized in that: An electric telescopic rod is provided on the second gear, and the end of the electric telescopic rod is detachably connected to the fourth gear.

8. The rotary drilling device for PC pile rotary drilling according to claim 7, characterized in that: A synchronous groove is opened on the fourth gear, and a synchronous tooth matching the synchronous groove is provided at the end of the electric telescopic rod.

9. The rotary drilling device for PC pile rotary drilling according to claim 5, characterized in that: A transmission rod is provided on the third gear. A first sprocket is fixedly sleeved on the transmission rod. The first sprocket is connected to a second sprocket through a chain drive. The second sprocket is connected to the screw rod. A sixth gear is provided at the end of the transmission rod. A seventh gear is meshed on one side of the sixth gear. The seventh gear is connected to an eighth gear through a second connecting rod. A ninth gear is meshed on one side of the eighth gear. The ninth gear is slidably sleeved on the drill pipe and is rotatably connected to the protruding part.

10. A rotary drilling device for PC pile rotary drilling according to claim 9, characterized in that: The ninth gear is provided with a through hole matching the shape and size of the drill pipe. Limit through grooves are opened at both ends of the through hole. Limit parts matching the shape, size and position of the limit through grooves are provided at both ends of the drill pipe.

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