Foundation cast-in-place pile construction device
By combining nested drilling units and hammer heads, the problem of easy collapse of pile holes in sandy layers was solved, and stable construction and high-quality forming of cast-in-place piles were achieved.
Patent Information
- Application Number
- CN202423095202.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-16
AI Technical Summary
The existing long spiral drilling and grouting pile construction technology is prone to pile hole collapse in sandy layers, resulting in high difficulty in grouting and poor forming quality.
The drilling unit adopts a nested type, including an internal main drill rod and a drill barrel sleeved outside the main drill rod. The outer surface of the main drill rod is equipped with large spiral blades, and the outer wall of the drill barrel is equipped with small spiral blades. The power mechanism synchronously or intermittently drives the main drill rod and the drill barrel, and together with the hammer head, it realizes stable drilling and diameter expansion of the pile hole.
It effectively prevents pile hole collapse, reduces construction difficulty, ensures the quality of cast-in-place piles, and improves the forming effect.
Smart Images
Figure CN223497829U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cast-in-place pile construction technology, and specifically to a foundation cast-in-place pile construction device. Background Technology
[0002] The existing construction technology for long spiral bored piles is as follows:
[0003] 1. The long screw drilling rig rotates and drills, bringing out the soil in the pile hole to the designed depth;
[0004] 2. After drilling, pull out the pile pipe and use the cohesion of the soil to keep the soil on the sidewall of the hole from collapsing, or use special equipment and technology to protect the wall with mud.
[0005] 3. Pour concrete and vibrate it to form piles.
[0006] The disadvantage of this construction technique is that it does not provide ideal protection for the soil on the sidewalls of the pile hole, especially when the groundwater level is high and the foundation soil contains a lot of sand, the collapse of the hole wall is more serious. How to form and pour cast-in-place piles in sandy layers has become a problem that must be solved. Utility Model Content
[0007] This utility model provides a foundation grouting pile construction device, which improves upon the problems of thick sand layers, easy collapse of pile holes, high difficulty in grouting piles, and poor quality of grouting piles after molding.
[0008] To solve the above problems, the technical solution of this utility model is as follows:
[0009] A foundation grouting pile construction device includes a spiral drilling rig device, wherein the power mechanism of the spiral drilling rig device is connected to a nested drilling unit.
[0010] The nested drilling unit includes a built-in main drill rod and a drill cylinder sleeved outside the main drill rod. The outer surface of the main drill rod is provided with large helical blades, and the outer wall of the drill cylinder is provided with small helical blades.
[0011] The main drill rod and drill barrel are coaxially arranged, and the power mechanism is configured to drive the rotation of the main drill rod and drill barrel. The lower end of the main drill rod passes through the bottom of the drill barrel to form an extension section. The auger drilling rig includes a first auger drilling rig body, and the power mechanism includes a first drive motor. A first movable seat is fixedly connected to the top of the first drive motor. A linear guide rail is provided on one side of the first movable seat, and the first movable seat is slidably connected to the linear guide rail.
[0012] Preferably, the power mechanism synchronously drives the main drill pipe and drill barrel or intermittently drives the main drill pipe and drill barrel.
[0013] Preferably, the top of the linear guide rail is provided with a guide wheel mechanism, and the top of the first movable seat is connected to the winch of the first auger drill body by a wire rope passing around the guide wheel mechanism.
[0014] Preferably, the structure of the power mechanism that synchronously drives the main drill pipe and the drill barrel is as follows: the top end of the drill barrel is coaxially provided with a first connecting cylinder, the bottom edge of the first connecting cylinder is provided with a first outer flange, and the top edge of the drill barrel is provided with a second outer flange.
[0015] The first outer flange and the second outer flange are fixedly connected by a first bolt and nut assembly. The top end of the first connecting cylinder is fixedly connected to the outer wall of the main drill rod by a plurality of equally spaced stiffening connecting plates. The top end of the main drill rod is fixedly connected to the end of the output shaft of the first drive motor.
[0016] Preferably, the auger drilling rig device further includes a second auger drilling rig body located on the opposite side of the first auger drilling rig body, and the power mechanism further includes a second drive motor;
[0017] The structure of the power mechanism that intermittently drives the main drill rod and drill barrel is as follows: the linear guide rails of the first spiral drilling machine body and the second spiral drilling machine body are symmetrically arranged on both sides of the pile hole; the two ends of the first moving seat are respectively slidably connected to the corresponding linear guide rails; the top of the drill barrel is also provided with a second connecting cylinder; the bottom of the second connecting cylinder is provided with a third outer flange; the third outer flange and the second outer flange at the top of the drill barrel are fixedly connected by a second bolt and nut assembly.
[0018] The first movable seat is slidably connected to two linear guide rails below it. A connecting plate is connected between the two second movable seats in the transverse direction. The connecting plate has a through hole for the second connecting cylinder to pass through. A first fixing ring is coaxially fixed on the lower surface of the connecting plate where the lower port of the through hole is located.
[0019] The outer wall of the second connecting cylinder is coaxially fixedly connected to a second fixing ring. The first fixing ring and the second fixing ring are connected by a tension bearing. A driven gear is coaxially fixedly connected to the outer wall of the second connecting cylinder below the second fixing ring. The lower end of the connecting plate is fixedly connected to a second drive motor.
[0020] The output shaft of the second drive motor is fixedly connected to a drive gear, which meshes with a driven gear. An electric telescopic mechanism is also longitudinally connected between the first movable seat and the second movable seat.
[0021] Preferably, the outer end of the small helical blade is in sliding engagement with the inner wall of the drill barrel; the stroke of the electric telescopic mechanism is the same as the length of the extension section.
[0022] Preferably, the drill barrel is further equipped with a hammer head, which includes a column and a fourth outer flange located at the bottom of the column. The fourth outer flange is fixedly connected to the second outer flange by a third bolt and nut assembly, and a fixing block is provided at the top of the column.
[0023] This utility model has the following beneficial effects:
[0024] This utility model provides a foundation cast-in-place pile construction device, which solves the problems of easy collapse of pile holes, high difficulty in casting, and poor quality of cast-in-place piles due to thick sand layers during the construction process. This utility model can avoid pile hole collapse, reduce construction difficulty, and ensure the quality of cast-in-place piles. Attached Figure Description
[0025] Figure 1 A schematic diagram of the equipment structure corresponding to Method 1 of this utility model;
[0026] Figure 2 A partial cross-sectional view of the equipment corresponding to Method 1 of this utility model;
[0027] Figure 3 A schematic diagram of the structure after the main drill rod is removed using the method of this utility model;
[0028] Figure 4 A schematic diagram of the structure of Method 1 of this utility model, in which the drill barrel is hammered to the bottom of the pile hole;
[0029] Figure 5 A schematic diagram of the structure after removing the hammer head in Method 1 of this utility model;
[0030] Figure 6 A schematic diagram of the structure of the cast-in-place pile after casting according to the method of this utility model;
[0031] Figure 7 A magnified schematic diagram of a portion of the structure at point A of this utility model;
[0032] Figure 8 A schematic diagram of the implementation structure of Method 2 of this utility model;
[0033] Figure 9 A magnified schematic diagram of a portion of the structure at point B of this utility model.
[0034] 1. Soil at the construction site; 2. Main body of the first auger drilling rig; 3. Winch; 4. Guide wheel mechanism; 5. Wire rope; 6. First moving seat; 7. First drive motor; 8. First connecting cylinder; 9. First outer flange; 10. Second outer flange; 11. Stiffening connecting plate; 12. Main drill rod; 13. Drill barrel; 14. Small auger blade; 15. Large auger blade; 16. Drill bit; 17. Hole; 18. Pile hole; 19. Column; 20. Fixing block; 21. Fourth outer flange; 22. Cast-in-place pile; 23. Linear guide rail; 24. Second moving seat; 25. Electric telescopic mechanism; 26. Second connecting cylinder; 27. First fixing ring; 28. Second fixing ring; 29. Tension bearing; 30. Through hole; 31. Second drive motor; 32. Drive gear; 33. Driven gear. Detailed Implementation
[0035] The following is a detailed description of the embodiments of this utility model in a step-by-step manner. This description is only a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
[0036] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.
[0037] In the initial embodiment, the present invention provides a foundation grouting pile construction device, such as... Figure 1-9 As shown, the device includes a spiral drilling rig. The power mechanism of the spiral drilling rig is connected to a nested drilling unit. The nested drilling unit includes a built-in main drill rod 12 and a drill cylinder 13 sleeved around the main drill rod 12. The outer surface of the main drill rod 12 is provided with large spiral blades 15, and the outer wall of the drill cylinder 13 is provided with small spiral blades 14. The main drill rod 12 and the drill cylinder 13 are coaxially arranged. The power mechanism is configured to drive the rotation of the main drill rod 12 and the drill cylinder 13. The lower end of the main drill rod 12 passes through the bottom 13 of the drill cylinder to form an extension section. The large spiral blades are large in size and are used to drill the main body of the pile hole, such as... Figure 1 As shown, the main body is the hole 17 drilled by the main drill rod 12, while the small helical blade 14 is only used to enlarge the diameter of the hole 17. Since the main drill rod 12 has already drilled the main body of the pile hole 18, the subsequent diameter enlargement process has relatively little resistance and can be completed smoothly through the drill barrel 13. The dimensions of the large and small helical blades can be set as needed.
[0038] In a further embodiment, such as Figure 1-9 As shown, the power mechanism synchronously drives the main drill rod and drill barrel or intermittently drives them. This embodiment provides two drilling methods, both applicable to drilling and casting-in-place piles in sandy geological conditions.
[0039] In a further embodiment, such as Figure 1-9 As shown, the auger drilling rig includes a first auger drilling rig body 2, and the power mechanism includes a first drive motor 7. A first movable seat 6 is fixedly connected to the top of the first drive motor 7. A longitudinally arranged linear guide rail 23 is provided on one side of the first movable seat 6. The first movable seat 6 is slidably connected to the linear guide rail 23. A guide wheel mechanism 4 is provided at the top of the linear guide rail 23. The top of the first movable seat 6 is connected to the winch 3 of the first auger drilling rig body 2 via a steel wire rope 5 passing over the guide wheel mechanism 4. The structure of the first auger drilling rig body can refer to commercially available products. This embodiment provides one implementation method, namely, the winch 3 pulls the first movable seat up and down along the linear guide rail 23, and the first drive motor is used as the power source to drive drilling. The linear guide rail is fixedly connected to the end of the first auger drilling rig body. According to common designs, a counterweight is provided on the base plate of the first auger drilling rig body.
[0040] In a further embodiment, such as Figure 1-7 As shown, the structure of the power mechanism synchronously driving the main drill rod 12 and the drill barrel 13 is as follows: a first connecting cylinder 8 is coaxially provided at the top of the drill barrel 13; a first outer flange 9 is provided at the bottom edge of the first connecting cylinder 8; a second outer flange 10 is provided at the top edge of the drill barrel 13; the first outer flange 9 and the second outer flange 10 are fixedly connected by a first bolt and nut assembly; the top of the first connecting cylinder 8 is fixedly connected to the outer wall of the main drill rod 12 by multiple equally spaced stiffening connecting plates 11; and the top of the main drill rod 12 is fixedly connected to the end of the output shaft of the first drive motor 7. The mud and sand drilled out by the main drill rod mainly pass through the drill barrel and the first connecting cylinder, and are discharged through the gaps between adjacent stiffening connecting plates. The soil drilled out by the drill barrel is discharged from the pile hole port outside the drill barrel. When the first drive motor rotates, it synchronously drives the main drill rod and the drill barrel to rotate, realizing the synchronous drilling and diameter expansion of the hole.
[0041] In a further embodiment, such as Figure 8 , 9As shown, the auger drilling rig device also includes a second auger drilling rig body (not marked in the figure, its structure is the same as the first auger drilling rig body) located on the opposite side of the first auger drilling rig body 2. The power mechanism also includes a second drive motor 31. The structure of the power mechanism intermittently driving the main drill rod 12 and the drill barrel 13 is as follows: the linear guide rails 23 of the first auger drilling rig body 2 and the second auger drilling rig body are symmetrically arranged on both sides of the pile hole. The two ends of the first movable seat 6 are slidably connected to the corresponding linear guide rails 23. The top of the drill barrel 13 is also provided with a second connecting cylinder 26. The bottom end of the second connecting cylinder 26 is provided with a third outer flange (not marked in the figure). The third outer flange is fixedly connected to the second outer flange 10 at the top of the drill barrel by a second bolt and nut assembly. The two linear guide rails 23 below the first movable seat 6 are respectively slidably connected to the two second movable seats 24. A connecting plate (not marked in the figure) is connected laterally between the first moving seat 6 and the second moving seat 24. The connecting plate has a through hole 30 for passing through the second connecting cylinder 26. A first fixing ring 27 is coaxially fixed on the lower surface of the connecting plate where the lower end of the through hole 30 is located. A second fixing ring 28 is coaxially fixed to the outer wall of the second connecting cylinder 26. The first fixing ring 27 and the second fixing ring 28 are connected by a tension bearing 29. A driven gear 33 is coaxially fixed to the outer wall of the second connecting cylinder 26 where the second fixing ring 28 is located. The lower end of the connecting plate is fixedly connected to the second drive motor 31. A drive gear 32 is fixedly connected to the output shaft of the second drive motor 31. The drive gear 32 and the driven gear 33 are meshed. An electric telescopic mechanism 25 (such as an electric cylinder, hydraulic cylinder, pneumatic cylinder, or other telescopic device) is also longitudinally connected between the first moving seat 6 and the second moving seat 24. When the second drive motor starts, the drive gear drives the driven gear to rotate, which in turn drives the second connecting cylinder to rotate, which in turn drives the drill barrel to rotate. As the drilling progresses, the electric telescopic mechanism 25 extends until the required drilling stroke is reached.
[0042] In a further embodiment, such as Figure 1-9 As shown, the outer end of the small helical blade 15 is slidably fitted with the inner wall of the drill barrel 13; the stroke of the electric telescopic mechanism 25 is the same as the length of the extension section.
[0043] In a further embodiment, such as Figure 3 As shown, the drill barrel 13 is also equipped with a hammer head, which includes a column 19 and a fourth outer flange 21 located at the bottom of the column 19. The fourth outer flange 21 is fixedly connected to the second outer flange 10 by a third bolt and nut assembly. A fixing block 20 is provided at the top of the column 19. When the drill bit of the main drill rod reaches the bottom of the pile hole, the main drill rod can be removed. Due to the limited length of the extension section, the low resistance of the sand layer, and the fact that the hole has already been drilled by the main drill rod, the drill barrel can reach the pile hole depth by hammering.
[0044] Based on the above embodiments, this embodiment discloses a construction method for a foundation cast-in-place pile construction device, such as... Figure 1-9 As shown, there are two methods: Method 1, which involves synchronously driving the main drill pipe and drill barrel with a power mechanism, and Method 2, which involves intermittently driving the main drill pipe and drill barrel.
[0045] like Figure 1-7 As shown, method one includes the following steps:
[0046] (11) The drill barrel 13 is sleeved on the outside of the main drill rod 12. The top end of the drill barrel 13 is fixedly connected to the outer wall of the main drill rod 12 through the first connecting cylinder 8. The first drive motor 7 is started to start drilling. During the drilling process, the main drill rod 12 is used to drill the main body of the pile hole 18, and the drill barrel 13 is used to expand the diameter of the hole 17 drilled by the main drill rod by screwing in the drill. Finally, it is used to form the pile hole 18 of the required size.
[0047] (12) When the drill bit 16 of the main drill rod 12 reaches the depth of the bottom of the pile hole 18, stop the first drive motor 7, remove the first bolt and nut assembly, and take the main drill rod 12 together with the first connecting cylinder out of the drill cylinder 13.
[0048] (13) such as Figure 4 As shown, a hammer head is connected to the top of the drill barrel 13, and the drill barrel is hammered to the depth of the bottom of the pile hole 18 by a hammering device.
[0049] (14) such as Figure 5 , 6 As shown, the hammer head is removed, and concrete is poured into the drill barrel 13 and cured to form.
[0050] (15) such as Figure 6 As shown, the drill pipe 13 is removed by lifting equipment, and concrete grout is poured into the gap between the cast-in-place pile 22 and the pile hole 18 (the cast-in-place pile and the pile hole are supported by pads, and then the gap is filled).
[0051] It should be noted that, considering the significant amount of mud and sand falling to the bottom of the pile hole during the hammer drilling process, the depth of the hole drilled by the main drill rod can be slightly deeper than the bottom depth of the pile hole to accommodate the mud and sand generated during the diameter expansion. Generally speaking, the amount of mud and sand generated by the hammer expansion in the extension section is relatively small, and this error can be ignored. Alternatively, a hammering device can be placed inside the drill barrel to compact the mud and sand at the bottom of the drill barrel.
[0052] like Figure 8 , 9 As shown, the second method includes the following steps:
[0053] (21) The first spiral drilling machine body 2 and the second spiral drilling machine body are arranged on both sides of the preset pile hole position, so that the two ends of the first moving seat 6 are slidably connected to the two linear guide rails 23, and the two second moving seats 24 are fixedly connected by a connecting plate. The main drill rod passes through the through hole 30, and the drill cylinder 13 is sleeved on the outside of the main drill rod 12 and connected to the drill cylinder 13 through the second connecting cylinder 26. The second connecting cylinder 26 passes through the through hole 30 and is rotatably connected to the connecting plate through the tension bearing 29. At this time, the driving gear 32 and the driven gear 33 are meshed and connected.
[0054] (22) The first drive motor 7 starts first. When the extension section is completely in the soil, the first drive motor 7 stops and the second drive motor 31 starts, so that the drill barrel 13 rotates downward along the inner wall of the hole 17 drilled by the main drill rod and expands the diameter of the hole. During this process, the electric telescopic mechanism 25 extends until the stroke of the extension section is reached and the second drive motor 31 stops. Then, the first drive motor 7 is started again, so that the main drill rod 12 drills the hole 17 of the extension section length. Then the second drive motor 31 is started again to expand the diameter. This process is repeated until the pile hole 18 is formed.
[0055] (23) Remove the second bolt and nut assembly, and remove the main drill rod 12 and the second connecting cylinder 26 on its outer side to the construction position (at this time, the second moving seat can be connected by the first spiral drilling machine body 2 and the second spiral drilling machine body through a wire rope). Pour concrete into the drill cylinder 13, and after curing, remove the drill cylinder 13 and pour concrete grout into the gap between the outer wall of the cast-in-place pile 22 and the pile hole 18 (support the cast-in-place pile and the pile hole with a pad, and then fill the gap).
Claims
1. A foundation pile construction device, characterized in that: Includes a spiral drilling rig, wherein the power mechanism of the spiral drilling rig is connected to a nested drilling unit; The nested drilling unit includes a built-in main drill rod and a drill cylinder sleeved outside the main drill rod. The outer surface of the main drill rod is provided with large helical blades, and the outer wall of the drill cylinder is provided with small helical blades. The main drill rod and drill barrel are coaxially arranged, and the power mechanism is configured to drive the rotation of the main drill rod and drill barrel. The lower end of the main drill rod passes through the bottom of the drill barrel to form an extension section. The auger drilling rig includes a first auger drilling rig body, and the power mechanism includes a first drive motor. A first movable seat is fixedly connected to the top of the first drive motor. A linear guide rail is provided on one side of the first movable seat, and the first movable seat is slidably connected to the linear guide rail.
2. The foundation grouting pile construction device as described in claim 1, characterized in that: The power mechanism can synchronously drive the main drill pipe and drill barrel or intermittently drive the main drill pipe and drill barrel.
3. The foundation grouting pile construction device as described in claim 2, characterized in that: The linear guide rail is equipped with a guide wheel mechanism at its top, and the top of the first movable seat is connected to the winch of the first auger drill body via a wire rope that passes around the guide wheel mechanism.
4. The foundation grouting pile construction device as described in claim 3, characterized in that: The structure of the power mechanism that synchronously drives the main drill pipe and the drill barrel is as follows: the top of the drill barrel is coaxially provided with a first connecting cylinder, the bottom edge of the first connecting cylinder is provided with a first outer flange, and the top edge of the drill barrel is provided with a second outer flange. The first outer flange and the second outer flange are fixedly connected by a first bolt and nut assembly. The top end of the first connecting cylinder is fixedly connected to the outer wall of the main drill rod by a plurality of equally spaced stiffening connecting plates. The top end of the main drill rod is fixedly connected to the end of the output shaft of the first drive motor.
5. The foundation grouting pile construction device as described in claim 3, characterized in that: The aforementioned auger drilling rig device also includes a second auger drilling rig body located on the opposite side of the first auger drilling rig body, and the power mechanism also includes a second drive motor; The structure of the power mechanism that intermittently drives the main drill rod and drill barrel is as follows: the linear guide rails of the first spiral drilling machine body and the second spiral drilling machine body are symmetrically arranged on both sides of the pile hole; the two ends of the first moving seat are respectively slidably connected to the corresponding linear guide rails; the top of the drill barrel is also provided with a second connecting cylinder; the bottom of the second connecting cylinder is provided with a third outer flange; the third outer flange and the second outer flange at the top of the drill barrel are fixedly connected by a second bolt and nut assembly. The first movable seat is slidably connected to two linear guide rails below it. A connecting plate is connected between the two second movable seats in the transverse direction. The connecting plate has a through hole for the second connecting cylinder to pass through. A first fixing ring is coaxially fixed on the lower surface of the connecting plate where the lower port of the through hole is located. The outer wall of the second connecting cylinder is coaxially fixedly connected to a second fixing ring. The first fixing ring and the second fixing ring are connected by a tension bearing. A driven gear is coaxially fixedly connected to the outer wall of the second connecting cylinder below the second fixing ring. The lower end of the connecting plate is fixedly connected to a second drive motor. The output shaft of the second drive motor is fixedly connected to a drive gear, which meshes with a driven gear. An electric telescopic mechanism is also longitudinally connected between the first movable seat and the second movable seat.
6. The foundation grouting pile construction device as described in claim 5, characterized in that: The outer end of the small helical blade slides against the inner wall of the drill barrel; the stroke of the electric telescopic mechanism is the same as the length of the extension section.
7. The foundation grouting pile construction device as described in claim 4, characterized in that: The drill barrel is also equipped with a hammer head, which includes a column and a fourth outer flange located at the bottom of the column. The fourth outer flange is fixedly connected to the second outer flange by a third bolt and nut assembly, and a fixing block is provided at the top of the column.