High-strength muddy silty clay mixing pile
By injecting triethanolamine and damping pads into sludge silty clay mixing piles with high pressure spray pipes to buffer vibration, the problems of poor mixing quality and fast wear of the drill bit are solved, and the cement slurry strength and drill bit service life are improved.
Patent Information
- Application Number
- CN202421019026.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2024-12-24
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When the mixing piles used in existing geotechnical engineering are treated with sludge slurry clay foundations, the mixing quality is difficult to ensure, the coreing rate is low, the strength is insufficient, and the drill bit wears fast during rotation and impact, and its service life is short.
A high-strength silty silty clay mixing pile was designed, and triethanolamine was injected with high-pressure spraying pipe and high-pressure powdering pipe to shorten the initial settling time of cement, improve the strength of cement slurry, and buffer vibration through support springs and damping pads to extend Drill service life.
The combination speed and early strength of the mixing pile soil and cement are improved, the wear of the drill bit is reduced, and the service life is extended.
Smart Images
Figure CN222227266U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mixing piles, in particular to a high-strength muddy silty clay mixing pile. Background Art
[0002] Cement-soil mixing piles are a method for reinforcing saturated soft clay foundations. They use cement as a curing agent and a special mixing machine to force the soft soil and curing agent to mix deep in the foundation. A series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil into a high-quality foundation with integrity, water stability and a certain strength. An application number CN202110501716.X has been retrieved, which is a mixing pile for geotechnical engineering. The mixing piles proposed in the invention will force cement and soil to mix deep in the soil layer in situ in an internal and external coordination manner, and have an efficient mixing effect.
[0003] Similar to the mixing piles used in the above-mentioned geotechnical engineering: although the cement and soil are forced to be mixed in situ deep in the soil layer through internal and external coordination, it has a highly efficient mixing effect. However, first of all, when faced with soft soil foundations, especially silty clay with high compressibility, high water content, low strength, loose structure and easy liquefaction, and a soft plastic to fluid plastic state, it is easy to make the mixing quality difficult to ensure, resulting in problems such as low pile coring rate, insufficient strength, and long consolidation time. Secondly, when the drill bit generates vibration and impact force during the process of rotating and hitting hard objects in the foundation, it does not have a buffer mechanism, which can easily cause the drill bit to wear too quickly, thereby reducing its service life.
[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a high-strength silty clay mixing pile is proposed to achieve a more practical purpose. Utility Model Content
[0005] The purpose of the utility model is to provide a high-strength silty clay mixing pile to solve the above-mentioned mixing pile for geotechnical engineering proposed in the background technology. First, when facing a soft soil foundation, especially silty clay with high compressibility, high water content, low strength, loose structure and easy liquefaction, in a soft plastic to fluid plastic state, it is easy to make the mixing quality difficult to ensure, and there are problems such as low pile coring rate, insufficient strength and long consolidation time. Secondly, when the drill bit generates vibration and impact force during rotation and collision with hard objects in the foundation, it does not have a buffer mechanism, which makes the drill bit easy to wear too quickly, thereby reducing its service life.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength silty clay mixing pile, comprising a drill rod, mixing blades and a drill bit, the bottom outer wall of the drill rod is arranged with mixing blades, a high-pressure shotcrete pipe is arranged on one side of the inner part of the drill rod, the bottom end of the high-pressure shotcrete pipe extends to the outer wall of the drill rod and is provided with a shotcrete port, a high-pressure powder spraying pipe is arranged on one side of the high-pressure shotcrete pipe, the bottom end of the high-pressure powder spraying pipe extends to the outer wall of the drill rod and is provided with a powder spraying port, the bottom end of the drill rod is provided with a mounting groove, and the drill bit is embedded in the mounting groove.
[0007] Furthermore, a support spring is connected to the top inner wall of the installation groove, the bottom end of the support spring is in contact with the drill bit, the outer walls on both sides of the drill bit are provided with limiting grooves, and the inner walls on both sides of the installation groove are provided with movable cavities.
[0008] Furthermore, the inner walls of the two groups of movable cavities are connected to a rotating threaded cylinder through a bearing, and the rotating threaded cylinder is threadedly connected to a movable threaded rod at one end close to the drill bit. Adjustment knobs are provided at the bottom ends of both sides of the drill rod, and the adjustment output end of the adjustment knob is connected to the rotating threaded cylinder.
[0009] Furthermore, one end of the movable threaded rod away from the rotating threaded barrel is connected to a top block via a bolt, the top block is embedded in the limiting groove, and one side of the top block close to the movable threaded rod is arranged and connected to the limiting rod.
[0010] Furthermore, one end of the top block away from the movable threaded rod is connected to a damping pad, the outer wall of the damping pad abuts against the inner wall of the limiting groove, and the damping pad is made of rubber.
[0011] Furthermore, an injection pipe is provided in the middle of the high-pressure shotcrete pipe and the high-pressure powder spraying pipe, and the bottom end of the injection pipe extends to the outer wall of the drill rod and is connected to a drug injection port. The injection port, shotcrete port and powder spraying port are all in the same straight line, and the outer wall of the drill bit is arranged with spiral blades.
[0012] Compared with the prior art, the utility model has the following beneficial effects: a high-strength muddy silty clay mixing pile, triethanolamine can be injected into cement slurry through the injection port for mixing, thereby shortening the initial setting time of cement, allowing the mixing pile soil and cement to combine quickly, and improving the strength of cement slurry, especially the early strength, by compressing and shrinking the support spring to absorb the impact force generated by the collision of the drill bit and then rebounding, and cooperating with the damping effect of the damping pad to reduce the shock generated by the rebound of the support spring, thereby achieving a buffering effect on the drill bit, the specific contents are as follows:
[0013] An injection pipe is arranged in the middle of the high-pressure grouting pipe and the high-pressure powder spraying pipe. The injection pipe can be connected to a computer-controlled high-pressure air pump and a triethanolamine agent tank. The bottom end of the injection pipe extends to the outer wall of the drill pipe and is connected to an injection port. Triethanolamine can be injected into the cement slurry for mixing through the injection port. The content is about 0.3% to 0.5%. When triethanolamine reacts with other substances in cement, it consumes a lot of water and generates a lot of heat. In this way, the water content in the mixing pile construction becomes less due to chemical reaction and evaporation, thereby shortening the initial setting time of the cement. The soil of the mixing pile combines quickly with cement, which can improve the strength of the cement slurry, especially the early strength. When the drill bit generates vibration and impact force during rotation and impacting hard objects in the foundation, the drill bit shrinks into the installation groove, and the support spring shrinks under pressure to absorb the impact force generated by the collision of the drill bit and then rebounds. The friction between the damping pad on the outer wall of the top block and the inner wall of the limit groove produces a certain damping effect, thereby reducing the shock caused by the rebound of the support spring, thereby achieving a buffering effect on the drill bit, thereby reducing the damage caused by excessive wear of the drill bit after rotation and impacting hard objects in the foundation, and improving the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the main structure of a high-strength silty clay mixing pile of the utility model;
[0015] Figure 2 This is a schematic diagram of the front view structure of a high-strength silty clay mixing pile of the utility model;
[0016] Figure 3 This is a schematic diagram of the structure of the movable cavity of a high-strength silty clay mixing pile of the utility model;
[0017] Figure 4 The utility model is a schematic diagram of the structure of a high-strength muddy silty clay mixing pile drill bit.
[0018] In the figure: 1. drill rod; 2. stirring blade; 3. high-pressure spraying pipe; 31. spraying port; 4. high-pressure powder spraying pipe; 41. powder spraying port; 5. mounting slot; 6. drill bit; 7. support spring; 8. limit slot; 9. movable chamber; 10. rotating threaded cylinder; 11. moving threaded rod; 12. adjusting knob; 13. top block; 14. limit rod; 15. damping pad; 16. injection pipe; 17. injection port; 18. spiral blade. 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 technicians in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figure 1 - Figure 4 The utility model provides a technical solution: a high-strength muddy silty clay mixing pile, comprising a drill rod 1, a mixing blade 2 and a drill bit 6. The mixing blades 2 are arranged on the bottom outer wall of the drill rod 1. The drill rod 1 is the pillar of the entire system and is usually made of high-strength steel. After the drill rod 1 is connected by a lifting device, the rotation and propulsion force is transmitted from the ground equipment to the drill bit 6. The mixing blades 2 play a stirring role. When the drill rod 1 rotates, the mixing blades 2 stir the surrounding soil, and cooperate with the pile mixing soil to quickly combine with cement to mix them into a slurry. A high-pressure spraying pipe 3 is arranged on one side of the inner part of the drill rod 1. The bottom end of the high-pressure spraying pipe 3 extends to the outer wall of the drill rod 1 and a spraying port 3 is arranged. 1. A high-pressure powder spraying pipe 4 is arranged on one side of the high-pressure spraying pipe 3. The bottom end of the high-pressure powder spraying pipe 4 extends to the outer wall of the drill rod 1 and is provided with a powder spraying port 41. The high-pressure spraying pipe 3 can be connected to a computer-controlled high-pressure slurry pump and a slurry making device and sprayed out through the spraying port 31. The high-pressure powder spraying pipe 4 is connected to a computer-controlled high-pressure air pump and a cement storage tank and then sprayed out through the powder spraying port 41. Cement in different states can be sprayed according to different soil layers to reasonably improve work efficiency and achieve the best foundation treatment effect. A mounting groove 5 is arranged at the bottom end of the drill rod 1. The mounting groove 5 plays an installation positioning role. A drill bit 6 is embedded in the mounting groove 5. The drill bit 6 is used to crush and cut the soil for subsequent mixing and grouting operations.
[0021] A support spring 7 is connected to the top inner wall of the installation groove 5. The support spring 7 plays a shock-absorbing role. It absorbs the vibration and impact force generated by the drill bit 6 during rotation and impact on hard objects in the foundation and then contracts. The bottom end of the support spring 7 abuts against the drill bit 6. Limiting grooves 8 are provided on the outer walls on both sides of the drill bit 6. The limiting grooves 8 play a limiting role. Active cavities 9 are provided on the inner walls on both sides of the installation groove 5.
[0022] The inner walls of the two groups of movable cavities 9 are connected with a rotating threaded cylinder 10 through bearings. The end of the rotating threaded cylinder 10 close to the drill bit 6 is threadedly connected with a movable threaded rod 11. The rotating threaded cylinder 10 can drive the movable threaded rod 11 to move horizontally when it is rotated. Adjustment knobs 12 are provided at the bottom ends of both sides of the drill rod 1. The adjustment output end of the adjustment knob 12 is connected to the rotating threaded cylinder 10. By rotating the adjusting knob 12, the rotating threaded cylinder 10 can be driven to rotate.
[0023] The end of the movable threaded rod 11 away from the rotating threaded barrel 10 is connected with a top block 13 by a bolt, and the top block 13 is embedded in the limiting groove 8. The top block 13 cooperates with the limiting groove 8 to limit the installation of the drill bit 6. The top block 13 is arranged on the side close to the movable threaded rod 11 and is connected to the limiting rod 14. The limiting rod 14 plays a limiting role to prevent the top block 13 and the movable threaded rod 11 from rotating with the rotating threaded barrel 10. When the drill bit 6 needs to be disassembled, rotating the adjusting knob 12 can drive the rotating threaded barrel 10 to rotate, and rotating the rotating threaded barrel 10 can drive the movable threaded rod 11 to translate. After the movable threaded rod 11 moves and drives the fixed top block 13 out of the limiting groove 8, the drill bit 6 can be taken out, which is convenient for replacing the drill bit 6 with excessive wear and consumption.
[0024] The end of the top block 13 away from the movable threaded rod 11 is connected to a damping pad 15, the outer wall of the damping pad 15 abuts against the inner wall of the limiting groove 8, the damping pad 15 is made of rubber material, and the damping pad 15 plays a damping role. When the drill bit 6 generates vibration and impact force during rotation and collision with hard objects in the foundation, the drill bit 6 shrinks into the installation groove 5, and the support spring 7 shrinks under pressure to absorb the impact force generated by the collision of the drill bit 6 and then rebounds. The friction between the damping pad 15 on the outer wall of the top block 13 and the inner wall of the limiting groove 8 produces a certain damping effect, thereby reducing the shock caused by the rebound of the support spring 7, thereby achieving a buffering effect on the drill bit 6, thereby reducing the damage caused by excessive wear of the drill bit 6 after rotation and collision with hard objects in the foundation, and improving the service life of the drill bit 6.
[0025] An injection pipe 16 is provided in the middle of the high-pressure grouting pipe 3 and the high-pressure powder spraying pipe 4. The injection pipe 16 can be connected to a computer-controlled high-pressure air pump and a triethanolamine agent tank. The bottom end of the injection pipe 16 extends to the outer wall of the drill pipe 1 and is connected to an injection port 17. Triethanolamine can be injected into the cement slurry for mixing through the injection port 17. The content is about 0.3% to 0.5%. When triethanolamine reacts with other substances in cement, it consumes a lot of water and emits a lot of heat. In this way, the moisture in the mixing pile construction becomes less due to chemical reaction and evaporation, thereby shortening the initial setting time of cement, allowing the mixing pile soil to combine with cement quickly, and improving the strength of cement slurry, especially the early strength. The injection port 17, the grouting port 31 and the powder spraying port 41 are all on the same straight line. The outer wall of the drill bit 6 is arranged with spiral blades 18, and the spiral blades 18 facilitate the drill bit to drill down.
[0026] Working principle: When using a high-strength muddy silty clay mixing pile, the rotation and propulsion force is transmitted from the ground equipment to the drill bit 6 after the drill rod 1 is connected through the lifting equipment. The mixing blade 2 plays a stirring role. When the drill rod 1 rotates, the mixing blade 2 stirs the surrounding soil, and the pile soil and cement are quickly combined to mix them into a slurry. The high-pressure spraying pipe 3 can be connected to the computer-controlled high-pressure slurry pump and slurry making equipment and sprayed through the spraying port 31. The high-pressure powder spraying pipe 4 is connected to the computer-controlled high-pressure air pump and the cement storage tank and sprayed through the powder spraying port 41. , according to different soil layers, cement in different states can be sprayed to reasonably improve work efficiency and achieve the best foundation treatment effect. The bottom end of the drill rod 1 is provided with a mounting groove 5, which plays a role in installation and positioning. The drill bit 6 is embedded in the mounting groove 5. The drill bit 6 is used to break and cut the soil to facilitate subsequent mixing and grouting operations. When the drill bit 6 needs to be disassembled, the adjusting knob 12 can be turned to drive the rotating threaded barrel 10 to rotate, and the rotating threaded barrel 10 can drive the movable threaded rod 11 to translate, and the movable threaded rod 11 moves to drive the fixed top block 13 to move. The drill bit 6 can be taken out after it comes out of the limiting groove 8, which is convenient for replacing the drill bit 6 with excessive wear and tear. When the drill bit 6 generates vibration and impact force during rotation and collision with hard objects in the foundation, the drill bit 6 contracts into the installation groove 5, and the support spring 7 contracts under pressure to absorb the impact force generated by the collision of the drill bit 6 and then rebounds. The friction between the damping pad 15 on the outer wall of the top block 13 and the inner wall of the limiting groove 8 produces a certain damping effect, thereby reducing the shock caused by the rebound of the support spring 7, thereby achieving a buffering effect on the drill bit 6, thereby reducing the rotation and After hitting the hard objects in the foundation, the drill bit 6 is damaged due to excessive wear. To increase the service life of the drill bit 6, triethanolamine can be injected into the cement slurry through the injection port 17 for mixing, with a content of about 0.3% to 0.5%. When triethanolamine reacts with other substances in the cement, it will consume a lot of water and generate a lot of heat. In this way, the moisture in the mixing pile construction becomes less due to chemical reaction and evaporation, thereby shortening the initial setting time of the cement, allowing the mixing pile soil to combine with the cement quickly, and can improve the strength of the cement slurry, especially the early strength.
Claims
1. A high-strength muddy silty clay mixing pile, comprising a drill rod (1), a mixing blade (2) and a drill bit (6), characterized in that: The bottom outer wall of the drill rod (1) is provided with stirring blades (2), a high-pressure grouting pipe (3) is provided on one side of the interior of the drill rod (1), the bottom end of the high-pressure grouting pipe (3) extending to the outer wall of the drill rod (1) is provided with a grouting port (31), a high-pressure powder spraying pipe (4) is provided on one side of the high-pressure grouting pipe (3), the bottom end of the high-pressure powder spraying pipe (4) extending to the outer wall of the drill rod (1) is provided with a powder spraying port (41), a mounting groove (5) is provided at the bottom end of the drill rod (1), the drill bit (6) is embedded in the mounting groove (5), and the top inner wall of the mounting groove (5) is connected to A support spring (7), the bottom end of the support spring (7) abuts against the drill bit (6), both sides of the outer wall of the drill bit (6) are provided with limit grooves (8), both sides of the inner wall of the mounting groove (5) are provided with movable cavities (9), the inner walls of the two groups of movable cavities (9) are connected to a rotating threaded cylinder (10) through a bearing, one end of the rotating threaded cylinder (10) close to the drill bit (6) is threadedly connected to a movable threaded rod (11), and both sides of the bottom end of the drill rod (1) are provided with adjustment knobs (12), and the adjustment output end of the adjustment knob (12) is connected to the rotating threaded cylinder (10).
2. A high-strength muddy silty clay mixing pile according to claim 1, characterized in that: One end of the movable threaded rod (11) away from the rotating threaded cylinder (10) is connected to a top block (13) via a bolt. The top block (13) is embedded in the limiting groove (8). The top block (13) is arranged on a side close to the movable threaded rod (11) and is connected to a limiting rod (14).
3. A high-strength muddy silty clay mixing pile according to claim 2, characterized in that: One end of the top block (13) away from the movable threaded rod (11) is connected to a damping pad (15), the outer wall of the damping pad (15) abuts against the inner wall of the limiting groove (8), and the damping pad (15) is made of rubber.
4. A high-strength muddy silty clay mixing pile according to claim 3, characterized in that: A drug injection pipe (16) is provided in the middle of the high-pressure grouting pipe (3) and the high-pressure powder spraying pipe (4); the bottom end of the drug injection pipe (16) extends to the outer wall of the drill rod (1) and is connected to a drug injection port (17); the drug injection port (17), the grouting port (31) and the powder spraying port (41) are all located on the same straight line; and spiral blades (18) are arranged on the outer wall of the drill bit (6).