Screw pile drilling structure and screw pile mold

Abstract

The spiral pile drilling structure comprises a pile body, a lower driving rod is inserted into the pile body in a penetrating mode, the upper end of the lower driving rod is fixedly connected with a drill rod connector, the drill rod connector is sleeved with a power head, and the side, close to the drill rod connector, of the power head is fixedly connected with a torsion disc; the pile tip is directly driven by the lower driving rod, then the pile tip drives the pile body of the threaded pile to be screwed into the soil layer, compared with the mode that the threaded pile is directly driven by a power head, the torque borne by the threaded pile body is greatly reduced, meanwhile, the torsion disc at the top has a free corner, and therefore the torque of the threaded pile body is greatly reduced. The free rotation angle can be adjusted according to the pile length of the threaded pile and the rigidity ratio of the threaded pile and the drill rod, and when the relative torsion angle of the top of the drill rod and the threaded pile reaches the free rotation angle, the torsion disc applies torque from the pile top through a pin bolt at the pile top to unload a threaded pile body.

Description

Technical Field

[0001] This invention relates to the field of helical piles, and specifically to a helical pile drilling structure and a helical pile mold. Background Technology

[0002] Existing concrete threaded piles have relatively low torsional strength, which cannot meet the requirements for rotary pressing into the soil layer, especially when penetrating a hard bearing layer where the required torque is very large. In other existing related patents, the torque of rotary pressing is often shared by using an inner anti-torsion steel pipe. However, the stiffness of high-strength concrete reaches 20% or even higher than that of steel, and the polar moment of inertia of the threaded pile is much greater than that of the inner steel pipe. The inner steel pipe can only share less than 20% of the torque, which still cannot significantly and effectively reduce the drilling torque of the concrete threaded pile. Therefore, this invention proposes a spiral pile drilling structure and spiral pile mold to solve the above problems. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a spiral pile drilling structure and a spiral pile mold. By directly driving the pile tip with a lower drive rod, the pile tip drives the threaded pile body to screw into the soil. Compared with the direct drive of the threaded pile by the power head, the torque borne by the threaded pile body is greatly reduced. At the same time, the torque plate at the top has a free rotation angle, which can be adjusted according to the length of the threaded pile and the stiffness ratio of the threaded pile to the drill rod. When the relative torsional angle between the top of the drill rod and the threaded pile reaches the free rotation angle, the torque plate applies torque from the top of the pile through the pin bolt at the top of the pile to unload the threaded pile body.

[0004] Technical solution

[0005] A spiral pile drilling structure includes a pile body, a lower drive rod inserted through the interior of the pile body, a drill rod connector fixedly connected to the upper end of the lower drive rod, a power head fitted into the drill rod connector, a torque disc fixedly connected to the side of the power head near the drill rod connector, a plurality of free-rotation notches arranged in a circular array on the torque disc, the torque disc being connected to the upper end of the pile body by pin bolts passing through the free-rotation notches, a pile tip fixedly connected to the bottom of the pile body, and a polygonal plug provided at the lower end of the lower drive rod, the polygonal plug driving the pile tip to rotate.

[0006] Furthermore, several connecting cylinders with internal threads are provided on the upper and lower end faces of the pile body. The lower connecting cylinder is fixedly connected to an inner polygonal hole plate through a first insert-type mechanical joint. The inner polygonal hole plate has several first threaded holes arranged in a ring array, and the first threaded holes are threadedly connected to the first insert-type mechanical joint. The inner polygonal hole plate is welded and fixed to the pile tip. The polygonal plug can be inserted into the middle of the inner polygonal hole plate. The pin bolt passes through the free-turn notch and is threadedly connected and fixed to the upper connecting cylinder.

[0007] Furthermore, when multiple pile sections need to be connected, the upper and lower pile sections are fixedly connected by a second insert-type mechanical joint. The upper end of the second insert-type mechanical joint is inserted into the connecting cylinder on the lower side of the upper pile section, and the lower end of the second insert-type mechanical joint is inserted into the connecting cylinder on the upper side of the lower pile section. An intermediate drive rod is inserted into the upper pile section. The upper end of the intermediate drive rod is fixedly connected to a connecting joint that can be adapted to the power head, and the lower end of the intermediate drive rod is provided with a connecting slot that can be adapted to the drill pipe joint.

[0008] In another embodiment, a plurality of end plate tensioning holes are provided in the upper and lower end faces of the pile body, and an end plate with an inner polygonal hole is fixedly connected to the upper and lower end faces of the pile body. The lower end plate is fixed to the pile tip by welding, and the polygonal plug is inserted into the inner polygonal hole of the end plate. A plurality of second threaded holes are provided on the end plate, which are directly opposite to the tensioning holes of the end plate. The pin bolt passes through the free rotation notch and is threadedly connected and fixed to the second threaded hole of the upper end plate.

[0009] Furthermore, when multiple pile sections need to be connected, the upper and lower pile sections are fixedly connected by a third insert-type mechanical joint. The upper end of the third insert-type mechanical joint is connected to the second threaded hole on the lower side of the upper pile section, and the lower end of the third insert-type mechanical joint is connected to the second threaded hole on the upper side of the lower pile section. An intermediate drive rod is inserted into the upper pile section. The upper end of the intermediate drive rod is fixedly connected to a connecting joint that can be adapted to the power head, and the lower end of the intermediate drive rod is provided with a connecting slot that can be adapted to the drill pipe joint.

[0010] Furthermore, a spiral rib is provided on the pile tip.

[0011] A spiral pile drilling structure includes a spiral pile mold comprising two pipe pile molds. The interior of each pipe pile mold is provided with a plurality of inner lining molds. A connecting screw hole is provided on the side of each inner lining mold near the inner side of the pipe pile mold. A through hole is provided on the pipe pile mold, and a bolt is inserted into the through hole and threaded into the connecting screw hole to fix the inner lining mold.

[0012] In another embodiment, a spiral pile drilling structure includes two pipe pile molds, wherein a plurality of fixed liner molds are fixedly arranged inside the pipe pile molds, and a plurality of movable liner molds are fixedly connected to the fixed liner molds by strong magnets.

[0013] Beneficial effects

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] By directly driving the pile tip with the lower drive rod, and then the pile tip drives the threaded pile body to screw into the soil, the torque borne by the threaded pile body is greatly reduced compared with the direct drive of the threaded pile by the power head. At the same time, the torque plate at the top has a free rotation angle, which can be adjusted according to the length of the threaded pile and the stiffness ratio of the threaded pile to the drill rod. When the relative torsional angle between the top of the drill rod and the threaded pile reaches the free rotation angle, the torque plate applies torque from the top of the pile through the pin bolts at the top of the pile to unload the threaded pile body. The maximum torque of the pile body can be further reduced by up to 50%. The movable liner can solve the problem of demolding when the joint angle between the threaded pile and the pipe pile mold is less than 90 degrees. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a first embodiment of a spiral pile drilling structure according to the present invention;

[0017] Figure 2 This is a schematic diagram of the multi-pile connection structure in Example 1;

[0018] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0019] Figure 4 This is a schematic diagram of the multi-pile connection structure in Example 2;

[0020] Figure 5 This is a schematic diagram of the connection structure between the lower drive rod and the middle drive rod.

[0021] Figure 6 This is a schematic diagram of the torsion disc.

[0022] Figure 7 This is a schematic diagram of the end plate structure;

[0023] Figure 8 This is a schematic diagram of a circular plate with an internal polygonal hole.

[0024] Figure 9 This is a schematic diagram of the structure of an insertion mechanical connector;

[0025] Figure 10 This is a schematic diagram of the structure of a spiral pile mold;

[0026] Figure 11 This is a schematic diagram of the exploded structure of a spiral pile mold;

[0027] Figure 12 This is a structural schematic diagram of the pile.

[0028] Figure 13 for Figure 10 Top view of the inner lining mold and the pipe pile mold;

[0029] Figure 14 This is a schematic diagram of the disassembled structure of the inner lining mold;

[0030] Figure 15 A schematic diagram of another embodiment of the spiral pile mold;

[0031] Figure 16 Exploded view of another embodiment of the helical pile mold;

[0032] Figure 17 for Figure 15 Top view of the movable liner, fixed liner, and pipe pile mold;

[0033] Figure 18 This is a schematic diagram showing the disassembled structure of the movable and fixed liner molds.

[0034] Attached icon number

[0035] 1. Pile body; 2. Lower drive rod; 3. Drill rod connector; 4. Connecting cylinder; 5. Polygonal plug; 6. Inner polygonal hole plate; 7. Pile tip; 8. Torque disc; 9. Power head; 11. Spiral rib; 12. End plate; 13. End plate tensioning hole; 14. First insertion mechanical connector; 15. Second insertion mechanical connector; 16. Third insertion mechanical connector; 17. Pin bolt; 18. Intermediate drive rod; 19. Connecting hole groove; 20. Connecting joint; 21. Free rotation notch; 22. Second threaded hole; 23. First threaded hole; 24. Inner liner mold; 25. Connecting screw hole; 26. Through hole; 27. Bolt; 28. Pipe pile mold; 29. ​​Movable liner mold; 30. Fixed liner mold. Detailed Implementation

[0036] To better illustrate the content of this invention, the following description is provided in conjunction with the accompanying drawings and examples:

[0037] have Figures 1-18 As shown, this invention discloses a spiral pile drilling structure, including a pile body 1. A lower drive rod 2 is inserted through the interior of the pile body 1. A drill rod connector 3 is fixedly connected to the upper end of the lower drive rod 2. A power head 9 is fitted into the drill rod connector 3. A torque disk 8 is fixedly connected to the side of the power head 9 near the drill rod connector 3. Several free-rotation notches 21 are arranged in a circular array on the torque disk 8. The torque disk 8 is connected to the upper end of the pile body 1 by a pin bolt 17 passing through the free-rotation notches 21. A pile tip 7 is fixedly connected to the bottom of the pile body 1. A polygonal plug 5 is provided at the lower end of the lower drive rod 2. The polygonal plug 5 drives the pile tip 7 to rotate.

[0038] Furthermore, several connecting cylinders 4 with internal threads are provided on the upper and lower end faces of the pile body 1. The lower connecting cylinder 4 is fixedly connected to an inner polygonal hole plate 6 through a first insert-type mechanical joint 14. Several first threaded holes 23 are arranged in a ring array on the inner polygonal hole plate 6. The first threaded holes 23 are threadedly connected to the first insert-type mechanical joint 14. The inner polygonal hole plate 6 is welded and fixed to the pile tip 7. The polygonal plug 5 can be inserted into the middle of the inner polygonal hole plate 6. The pin bolt 17 passes through the free-turning notch 21 and is threadedly connected and fixed to the upper connecting cylinder 4.

[0039] Furthermore, when multiple pile sections need to be connected, the upper and lower pile sections 1 are fixedly connected by a second insert-type mechanical joint 15. The upper end of the second insert-type mechanical joint 15 is inserted into the connecting cylinder 4 on the lower side of the upper pile section 1, and the lower end of the second insert-type mechanical joint 15 is inserted into the connecting cylinder 4 on the upper side of the lower pile section 1. An intermediate drive rod 18 is inserted into the upper pile section 1. The upper end of the intermediate drive rod 18 is fixedly connected to a connecting joint 20 that can be adapted to the power head 9, and the lower end of the intermediate drive rod 18 is provided with a connecting slot 19 that can be adapted to the drill pipe joint 3.

[0040] In another embodiment, a plurality of end plate tensioning holes 13 are provided in the upper and lower end faces of the pile body 1. An end plate 12 with an inner polygonal hole is fixedly connected to the upper and lower end faces of the pile body 1. The lower end plate 12 is fixed to the pile tip 7 by welding. The polygonal plug 5 is inserted into the inner polygonal hole of the end plate 12. A plurality of second threaded holes 22 are provided on the end plate 12, which are directly opposite to the end plate tensioning holes 13. The pin bolt 17 passes through the free rotation notch 21 and is threadedly connected and fixed to the second threaded hole 22 of the upper end plate 12.

[0041] Furthermore, when multiple pile sections need to be connected, the upper and lower pile sections 1 are fixedly connected by a third insert-type mechanical joint 16. The upper end of the third insert-type mechanical joint 16 is connected to the second threaded hole 22 on the lower side of the upper pile section 1, and the lower end of the third insert-type mechanical joint 16 is connected to the second threaded hole 22 on the upper side of the lower pile section 1. An intermediate drive rod 18 is inserted into the upper pile section 1. The upper end of the intermediate drive rod 18 is fixedly connected to a connecting joint 20 that can be adapted to the power head 9, and the lower end of the intermediate drive rod 18 is provided with a connecting slot 19 that can be adapted to the drill pipe joint 3.

[0042] Furthermore, a spiral rib 11 is provided on the pile tip 7.

[0043] A spiral pile drilling structure includes a spiral pile mold comprising two pipe pile molds 28. The interior of each pipe pile mold 28 is provided with a plurality of inner lining molds 24. A connecting screw hole 25 is provided on the side of each inner lining mold 24 near the inner side of the pipe pile mold 28. A through hole 26 is provided through the pipe pile mold 28. A bolt 27 is inserted into the through hole 26 and threaded to the connecting screw hole 25 to fix the inner lining mold 24.

[0044] In another embodiment, a spiral pile drilling structure includes two pipe pile molds 28, and a plurality of fixed liner molds 30 are fixedly arranged inside the pipe pile molds 28. The fixed liner molds 30 are fixedly connected to a plurality of movable liner molds 29 by strong magnets.

[0045] Specifically, in Embodiment 1, when installing the first insert mechanical connector 14, the first insert mechanical connector 14 is first screwed into the lower connecting cylinder 4, and then the lower end of the first insert mechanical connector 14 is inserted into the inner polygonal hole circular plate 6 to achieve the connection of the pile tip 7.

[0046] At this time, the pile tip 7 is directly driven by the lower drive rod 2. The lower drive rod 2 drives the inner polygonal hole plate 6 to rotate and further drives the pile tip 7 to rotate, thereby realizing the feeding of the pile body 1 and reducing the torque on the pile body 1.

[0047] At the same time, when the power head 9 rotates, it drives the upper end of the pile body 1 to rotate through the pin bolt 17, further reducing the torque on the pile body 1;

[0048] In the second embodiment, the pile tip 7 is directly welded and fixed to the end plate 12. The polygonal plug 5 of the lower drive rod 2 directly drives the pile tip 7 to rotate through the lower end plate 12, thereby realizing the feeding of the pile body 1 and reducing the torque on the pile body 1.

[0049] At the same time, when the power head 9 rotates, it drives the upper end plate 12 and the upper end of the pile body 1 to rotate through the pin bolt 17, further reducing the torque on the pile body 1 during drilling.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the technical solutions of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A spiral pile drilling structure, characterized in that: The pile includes a pile body (1), a lower drive rod (2) is inserted through the inside of the pile body (1), a drill rod connector (3) is fixedly connected to the upper end of the lower drive rod (2), a power head (9) is fitted into the drill rod connector (3), a torque disk (8) is fixedly connected to the side of the power head (9) near the drill rod connector (3), a number of free rotation notches (21) are arranged in a ring array on the torque disk (8), the torque disk (8) is connected to the upper end of the pile body (1) by a pin bolt (17) passing through the free rotation notch (21), a pile tip (7) is fixedly connected to the bottom of the pile body (1), a polygonal plug (5) is provided at the lower end of the lower drive rod (2), and the polygonal plug (5) drives the pile tip (7) to rotate.

2. The spiral pile drilling structure according to claim 1, characterized in that: The pile body (1) has several internally threaded connecting cylinders (4) on its upper and lower end faces. The lower connecting cylinder (4) is fixedly connected to an inner polygonal hole plate (6) through a first insert mechanical connector (14). The inner polygonal hole plate (6) has several first threaded holes (23) arranged in a ring array. The first threaded holes (23) are threadedly connected to the first insert mechanical connector (14). The inner polygonal hole plate (6) is welded and fixed to the pile tip (7). The polygonal plug (5) can be inserted into the middle of the inner polygonal hole plate (6). The pin bolt (17) passes through the free-turn notch (21) and is threadedly connected and fixed to the upper connecting cylinder (4).

3. The spiral pile drilling structure according to claim 2, characterized in that: When multiple pile sections need to be connected, the upper and lower pile sections (1) are fixedly connected by a second insert-type mechanical joint (15). The upper end of the second insert-type mechanical joint (15) is inserted into the connecting cylinder (4) on the lower side of the upper pile section (1), and the lower end of the second insert-type mechanical joint (15) is inserted into the connecting cylinder (4) on the upper side of the lower pile section (1). An intermediate drive rod (18) is inserted into the upper pile section (1). The upper end of the intermediate drive rod (18) is fixedly connected to a connecting joint (20) that can be adapted to the power head (9), and the lower end of the intermediate drive rod (18) is provided with a connecting slot (19) that can be adapted to the drill pipe joint (3).

4. The spiral pile drilling structure according to claim 1, characterized in that: The pile body (1) has several end plate tensioning holes (13) in the upper and lower end faces. The pile body (1) is fixedly connected to the end plate (12) with an inner polygonal hole. The lower end plate (12) is fixed to the pile tip (7) by welding. The polygonal plug (5) is inserted into the inner polygonal hole of the end plate (12). The end plate (12) has several second threaded holes (22) that are directly opposite to the end plate tensioning holes (13). The pin bolt (17) passes through the free rotation notch (21) and is threadedly connected to the second threaded hole (22) of the upper end plate (12).

5. The spiral pile drilling structure according to claim 4, characterized in that: When multiple pile sections need to be connected, the upper and lower pile sections (1) are fixedly connected by a third insert mechanical joint (16). The upper end of the third insert mechanical joint (16) is connected to the second threaded hole (22) on the lower side of the upper pile section (1), and the lower end of the third insert mechanical joint (16) is connected to the second threaded hole (22) on the upper side of the lower pile section (1). An intermediate drive rod (18) is inserted into the upper pile section (1). The upper end of the intermediate drive rod (18) is fixedly connected to a connecting joint (20) that can be adapted to the power head (9), and the lower end of the intermediate drive rod (18) is provided with a connecting hole groove (19) that can be adapted to the drill pipe joint (3).

6. The spiral pile drilling structure according to claim 1, characterized in that: The pile tip (7) is provided with a spiral rib (11).

7. A spiral pile mold for a spiral pile drilling structure according to any one of claims 1-6, characterized in that: The device includes two pipe pile molds (28), and several inner lining molds (24) are laid inside the pipe pile molds (28). A connecting screw hole (25) is provided on the side of the inner lining mold (24) near the inner side of the pipe pile mold (28). A through hole (26) is provided on the pipe pile mold (28). A bolt (27) is inserted into the through hole (26) and threaded to the connecting screw hole (25) to fix the inner lining mold (24).

8. A spiral pile mold for a spiral pile drilling structure according to any one of claims 1-6, characterized in that: It includes two pipe pile molds (28), and several fixed liner molds (30) are fixedly installed inside the pipe pile molds (28). Several movable liner molds (29) are fixedly connected to the fixed liner molds (30) by strong magnets.

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