Pile foundation underreaming drill bit
By designing a pile foundation expansion drill bit, the pile end expansion drill bit is achieved by combining the expansion drill bit connecting rod and piston sleeve, the pile end bottom expansion drill bit is solved, and the existing drill bit cannot fully utilize the bearing capacity of concrete and rock, and the pile end bearing capacity and resource utilization efficiency are improved.
Patent Information
- Application Number
- CN202421602154.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-08
AI Technical Summary
The holes drilled by existing drill bits are the same in diameter, which makes it impossible to fully utilize the bearing capacity of concrete and rocks, resulting in waste of resources and increasing carbon emissions.
A pile foundation expansion drill bit is designed. By combining the expansion drill bit connecting rod and the piston sleeve, before the pile bottom expansion drill bit is fully expanded during the drilling process, the outer cylinder frame provides a pressure greater than its own weight, pushing the pile bottom expansion drill bit to extend outward, and drill downwards after full expansion, completing the pile end bottom expansion.
Through the pile end bottom expansion technology, the bearing capacity of the pile end is significantly improved, the concrete usage is reduced, carbon emissions are reduced, and the efficient utilization of resources is achieved.
Smart Images
Figure CN222797458U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering pile foundation construction, in particular to a pile foundation bottom expansion drill bit. Background Art
[0002] Urban construction is developing rapidly, and various construction projects are intensive. Commonly used equal-section piles cannot give full play to the bearing capacity of concrete and rock, resulting in waste of resources and increased carbon emissions. Expanded bottom piles are a new type of pile. By expanding the hole at the bottom of the pile through pressure or mechanical means, only a small amount of concrete is added to obtain a significant increase in the compressive or tensile bearing capacity, increase the effective bearing area, and thus improve the bearing capacity of the pile end. Therefore, a pile foundation expansion drill bit is needed.
[0003] The holes drilled by existing drill bits have the same diameter, which results in the inability to fully utilize the bearing capacity of concrete and rock, causing waste of resources and increased carbon emissions. Utility Model Content
[0004] The purpose of the utility model is to provide a pile foundation bottom expansion drill bit to solve the problem that the holes drilled by the existing drill bits mentioned in the above background technology have the same diameter, which leads to the failure to fully exert the bearing capacity of concrete and rock, resulting in resource waste and increased carbon emissions. To achieve the above purpose, the utility model provides the following technical solutions: a pile foundation bottom expansion drill bit, including a bottom expansion drill bit connecting rod, the bottom of the outer wall of the bottom expansion drill bit connecting rod is fixedly connected to a latch plate, the two sides of the latch plate are fixedly connected to latch rods, the outer surface of the latch rod is sleeved with a pile bottom expansion drill bit, the other end of the latch rod is threadedly connected to a latch nut, and the interior of the pile bottom expansion drill bit is provided with an engaging groove.
[0005] Further preferably, the outer surface of the bottom expansion drill bit connecting rod is sleeved with a piston sleeve, and a connecting head is arranged above the piston sleeve. By installing the bottom expansion drill bit connecting rod, before the pile bottom expansion drill bit is fully expanded during drilling, the external pressure applied by the outer cylinder frame is greater than the deadweight pressure of the bottom expansion drill bit connecting rod, the excavation speed of the outer cylinder frame is greater than the excavation speed of the bottom of the bottom expansion drill bit connecting rod, and the rock surface at the bottom expansion drill bit connecting rod presses against the bottom expansion drill bit connecting rod, pushing the pile bottom expansion drill bit to extend outward.
[0006] Further preferably, the outer surface of the piston sleeve is fixedly connected to an outer cylinder frame, and an upper snap-in is provided on the outer surface of the outer cylinder frame. The pile bottom expansion drill bit is matched with the upper snap-in, and the upper snap-in provides vertical pressure for the pile bottom expansion drill bit, and the outer cylinder frame provides horizontal thrust for the pile bottom expansion drill bit to expand the hole at the pile end. When the pile bottom expansion drill bit is fully extended, the piston sleeve limits the vertical movement of the bottom expansion drill bit connecting rod, and the pressure of the outer cylinder frame and the bottom expansion drill bit connecting rod is consistent, and the hole is drilled downward to the designed depth synchronously, thereby completing the pile end bottom expansion.
[0007] Further preferably, a lower bayonet is provided on the outer surface of the outer cylinder frame, and the pile bottom expansion drill bit is matched with the lower bayonet. By installing the lower bayonet, the pile bottom expansion drill bit can be attached to the lower end of the upper bayonet and the upper end of the lower bayonet.
[0008] Further preferably, a drill bit movable opening is opened on the outer surface of the outer cylinder frame, and one end of the pile expansion bottom drill bit passes through the drill bit movable opening and extends to the outside of the drill bit movable opening. Then, the drill bit movable opening is installed to realize the movement of extending and recovering the pile expansion bottom drill bit at the drill bit movable opening.
[0009] Further preferably, a limiting groove is provided at the other end of the latch plate, and a limiting block is fixedly connected to the bottom of the inner wall of the outer cylinder frame, and the limiting block is adapted to the limiting groove. By installing the limiting groove, the limiting groove at the front end of the latch plate can be supported on the limiting block at the bottom of the inner wall of the outer cylinder frame. Then, when the pile foundation bottom expansion drill bit is lifted and retracted from the drill hole, the pile bottom expansion drill bit is retracted by utilizing the deadweight of the bottom expansion drill bit connecting rod, the pile bottom expansion drill bit and the components on the latch plate, thereby providing convenience for recovering the drill bit.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] In the utility model, by installing the bottom expansion drill rod, before the pile bottom expansion drill bit is fully extended during drilling, the external pressure of the outer cylinder frame is greater than the deadweight pressure of the bottom expansion drill rod, the excavation speed of the outer cylinder frame is greater than the excavation speed of the bottom expansion drill rod, the rock surface at the bottom expansion drill rod supports the bottom expansion drill rod, pushes the pile bottom expansion drill bit to extend outward, and the upper clamping mouth provides vertical pressure for the pile bottom expansion drill bit, and the outer cylinder frame provides horizontal thrust for the pile bottom expansion drill bit to expand the pile end, and when the pile bottom expansion drill bit is fully extended, the piston sleeve limits the vertical movement of the bottom expansion drill rod, the pressure of the outer cylinder frame and the bottom expansion drill rod is consistent, and the hole is drilled downward to the designed depth synchronously, thereby completing the pile end bottom expansion.
[0012] In the utility model, by installing the limiting groove, the limiting groove at the front end of the latch plate can be placed on the limiting block at the bottom of the inner wall of the outer cylinder frame. Then, when the pile foundation bottom expansion drill bit is lifted and retracted from the drill hole, the pile bottom expansion drill bit is retracted by utilizing the deadweight of the bottom expansion drill bit connecting rod, the pile bottom expansion drill bit and the components on the latch plate, thereby providing convenience for recovering the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;
[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model from top view;
[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;
[0016] Figure 4 This is a schematic diagram of the utility model in a top-down expanded cross-sectional structure;
[0017] Figure 5 This is a schematic diagram of the expanded cross-sectional structure of the utility model.
[0018] In the figure: 1. bottom expansion drill connecting rod; 2. latch plate; 3. latch rod; 4. pile bottom expansion drill; 5. latch nut; 6. fitting groove; 7. piston sleeve; 8. connector; 9. outer cylinder frame; 10. upper clamping joint; 11. lower clamping joint; 12. drill movable opening; 13. limit groove; 14. limit block. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figure 1-Figure 5 The utility model provides a technical solution: a pile foundation bottom expansion drill bit, including a bottom expansion drill bit connecting rod 1, a latch plate 2 is fixedly connected to the bottom of the outer wall of the bottom expansion drill bit connecting rod 1, latch rods 3 are fixedly connected to both sides of the latch plate 2, a pile bottom expansion drill bit 4 is sleeved on the outer surface of the latch rod 3, a latch nut 5 is threadedly connected to the other end of the latch rod 3, and an engaging groove 6 is opened inside the pile bottom expansion drill bit 4.
[0021] In this embodiment, Figure 1 , Figure 3 and Figure 5 As shown, the outer surface of the bottom drill bit connecting rod 1 is sleeved with a piston sleeve 7, and a connecting head 8 is arranged above the piston sleeve 7. By installing the bottom drill bit connecting rod 1, before the pile bottom drill bit 4 is fully expanded during drilling, the external pressure of the outer cylinder frame 9 is greater than the deadweight pressure of the bottom drill bit connecting rod 1, and the excavation speed of the outer cylinder frame 9 is greater than the excavation speed of the bottom of the bottom drill bit connecting rod 1. The rock surface at the bottom drill bit connecting rod 1 presses against the bottom drill bit connecting rod 1, pushing the pile bottom drill bit 4 to extend outward.
[0022] In this embodiment, Figure 1 , Figure 3 and Figure 5As shown, the outer surface of the piston sleeve 7 is fixedly connected to the outer cylinder frame 9, and the outer surface of the outer cylinder frame 9 is provided with an upper snap-in 10, the pile bottom expansion drill bit 4 is adapted to the upper snap-in 10, and the upper snap-in 10 provides vertical pressure for the pile bottom expansion drill bit 4, and the outer cylinder frame 9 provides horizontal thrust for the pile bottom expansion drill bit 4 to expand the pile end. When the pile bottom expansion drill bit 4 is fully extended, the piston sleeve 7 limits the vertical movement of the bottom expansion drill bit connecting rod 1, and the outer cylinder frame 9 and the bottom expansion drill bit connecting rod 1 have the same pressure, and the hole is drilled downward to the designed depth synchronously, thereby completing the pile end bottom expansion.
[0023] In this embodiment, Figure 1 , Figure 3 and Figure 5 As shown, a lower bayonet 11 is provided on the outer surface of the outer cylinder frame 9, and the pile expansion bottom drill bit 4 is matched with the lower bayonet 11. By installing the lower bayonet 11, the pile expansion bottom drill bit 4 can be attached to the lower end of the upper bayonet 10 and the upper end of the lower bayonet 11.
[0024] In this embodiment, Figure 2 , Figure 3 and Figure 4 As shown, a drill bit movable opening 12 is opened on the outer surface of the outer cylinder frame 9, and one end of the pile expansion bottom drill bit 4 passes through the drill bit movable opening 12 and extends to the outside of the drill bit movable opening 12. Then, the drill bit movable opening 12 is installed, so that the pile expansion bottom drill bit 4 can be extended and recovered at the drill bit movable opening 12.
[0025] In this embodiment, Figure 2 , Figure 3 and Figure 5 As shown, a limiting groove 13 is provided at the other end of the latch plate 2, and a limiting block 14 is fixedly connected to the bottom of the inner wall of the outer cylinder frame 9, and the limiting block 14 is adapted to the limiting groove 13. By installing the limiting groove 13, the limiting groove 13 at the front end of the latch plate 2 can be supported on the limiting block 14 at the bottom of the inner wall of the outer cylinder frame 9. Then, when the pile bottom expansion drill bit 4 is lifted and retracted from the borehole, the pile bottom expansion drill bit 4 is retracted by utilizing the deadweight of the bottom expansion drill bit connecting rod 1, the pile bottom expansion drill bit 4 and the components on the latch plate 2, thereby providing convenience for recovering the drill bit.
[0026] The use method and advantages of the utility model: When the pile foundation bottom expansion drill bit is used, the working process is as follows:
[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, firstly, by installing the bottom expansion drill bit connecting rod 1, before the pile bottom expansion drill bit 4 is fully extended during drilling, the external pressure of the outer cylinder frame 9 is greater than the deadweight pressure of the bottom expansion drill bit connecting rod 1, and the excavation speed of the outer cylinder frame 9 is greater than the excavation speed of the bottom expansion drill bit connecting rod 1. The rock surface at the bottom expansion drill bit connecting rod 1 supports the bottom expansion drill bit connecting rod 1, pushing the pile bottom expansion drill bit 4 to extend outward, and the upper clamping mouth 10 provides vertical pressure for the pile bottom expansion drill bit 4, and the outer cylinder frame 9 provides horizontal thrust for the pile bottom expansion drill bit 4 to expand the pile end. When the pile bottom expansion drill bit 4 is fully extended, the piston sleeve 7 limits the vertical movement of the bottom expansion drill bit connecting rod 1, and the pressure of the outer cylinder frame 9 and the bottom expansion drill bit connecting rod 1 is consistent, and drilling downward synchronously. The hole is drilled to the designed depth, thereby completing the bottom expansion of the pile end. Then, by installing the lower bayonet 11, the pile bottom expansion drill bit 4 can be close to the lower end of the upper bayonet 10 and the upper end of the lower bayonet 11. Then, by installing the drill bit movable opening 12, the pile bottom expansion drill bit 4 can be extended and recovered at the drill bit movable opening 12. Then, by installing the limiting groove 13, the limiting groove 13 at the front end of the latch plate 2 can be supported on the limiting block 14 at the bottom of the inner wall of the outer cylinder frame 9. Then, when the pile bottom expansion drill bit 4 is lifted and recovered from the drill hole, the pile bottom expansion drill bit 4 is retracted by the deadweight of the bottom expansion drill bit connecting rod 1, the pile bottom expansion drill bit 4 and the components on the latch plate 2, thereby providing convenience for recovering the drill bit.
[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Technical staff in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A pile foundation bottom expansion drill bit, comprising a bottom expansion drill bit connecting rod (1), characterized in that: The bottom of the outer wall of the bottom expansion drill bit connecting rod (1) is fixedly connected with a latch plate (2), and the two sides of the latch plate (2) are fixedly connected with latch rods (3). The outer surface of the latch rod (3) is sleeved with a pile bottom expansion drill bit (4), and the other end of the latch rod (3) is threadedly connected with a latch nut (5), and the interior of the pile bottom expansion drill bit (4) is provided with an engaging groove (6).
2. A pile foundation bottom expansion drill bit according to claim 1, characterized in that: The outer surface of the bottom-expanding drill bit connecting rod (1) is sleeved with a piston sleeve (7), and a connecting head (8) is arranged above the piston sleeve (7).
3. A pile foundation bottom expansion drill bit according to claim 2, characterized in that: The outer surface of the piston sleeve (7) is fixedly connected to an outer cylinder frame (9), and an upper bayonet (10) is provided on the outer surface of the outer cylinder frame (9), and the pile bottom expansion drill bit (4) is adapted to the upper bayonet (10).
4. A pile foundation bottom expansion drill bit according to claim 3, characterized in that: The outer surface of the outer cylinder frame (9) is provided with a lower bayonet (11), and the pile bottom expansion drill bit (4) is adapted to the lower bayonet (11).
5. A pile foundation bottom expansion drill bit according to claim 4, characterized in that: The outer surface of the outer cylinder frame (9) is provided with a drill bit movable opening (12), and one end of the pile bottom expansion drill bit (4) penetrates the drill bit movable opening (12) and extends to the outside of the drill bit movable opening (12).
6. A pile foundation bottom expansion drill bit according to claim 3, characterized in that: A limiting groove (13) is provided at the other end of the latch plate (2), and a limiting block (14) is fixedly connected to the bottom of the inner wall of the outer cylinder frame (9), and the limiting block (14) is adapted to the limiting groove (13).