Combined bidirectional mixing device for constructing mixing piles with enlarged heads.
By designing a combined bidirectional mixing device, the complexity and uncertainty of existing mixing pile equipment during the construction of the enlarged head are solved, achieving efficient and stable soft soil foundation reinforcement and improving pile quality and bearing capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO ZHUANGTAI CONSTR CO LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-17
AI Technical Summary
Existing mixing pile equipment suffers from problems such as complex equipment, long construction time, high cost, uncertainty in the shape and size of the enlarged head, and unstable pile quality when constructing the enlarged head, making it difficult to effectively prevent settlement of soft soil foundations.
A combined bidirectional mixing device is adopted, including a bidirectional mixing device for mixing piles and a bidirectional mixing device for enlarged heads. Through the design of bidirectional rotating drill rods and mixing heads, the synchronous construction of enlarged heads and mixing piles is achieved, ensuring the regularity and concentricity of enlarged heads and improving compressive and shear resistance.
This method enables simultaneous construction of the enlarged head and the mixing pile, reducing construction costs and time, improving pile quality and anti-settlement effect, ensuring the accuracy of the shape and size of the enlarged head, and enhancing the bearing capacity of the mixing pile.
Smart Images
Figure CN224514195U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pile foundation construction technology, specifically a combined bidirectional mixing device for constructing mixing piles with enlarged heads. Background Technology
[0002] The existing cement-soil mixing pile is simply called a mixing pile. The construction machine for mixing piles is relatively mature. During the construction process, the winch drives the power head up and down, and the power head drives the drill rod to rotate. On one hand, cement slurry is sprayed out through the slurry pipe in the drill rod and the nozzle on the mixing drill head. On the other hand, the mixing drill head drills down and stirs the cement soil. After the cement slurry solidifies, it becomes a mixing pile.
[0003] The drill rods of existing pile drivers have evolved from unidirectional rotation to bidirectional rotation of the inner and outer drill rods; and the mixing drill bits of existing pile drivers have evolved from unidirectional rotation and bidirectional rotation of the upper and lower mixing blades to bidirectional mixing drill bits composed of inner blades and a mixing frame with fixed outer blades in the same height range.
[0004] In existing technologies, the reinforcement of large-area soft soil foundations, such as soft soil subgrades of highways and high-grade roads, soft soil foundations of airport runways, and soft soil foundations of urban plazas, uses different equipment for settlement prevention and reinforcement, but each has its own shortcomings:
[0005] In the early stages, ordinary pile drivers were used to construct multiple mixing piles, such as 10-24 meters deep and 500mm-1000mm in diameter, which were arranged at intervals to form an anti-settlement structure for soft soil foundations. However, the disadvantages were obvious. If the density was too low, the settlement between the gaps would be uneven, and the anti-settlement reinforcement effect would be unsatisfactory. If the density was too high, too many mixing piles would be needed, the cost would be too high, and there would be too much waste of materials.
[0006] Later, technicians used a mixing equipment to first construct several mixing piles of conventional depth, and then construct a hardened layer composed of several meters deep cement-soil mixing piles on top of these mixing piles. The construction of the cement-soil mixing piles and the hardened layer at the top of the mixing equipment needs to be completed in two stages. In particular, the hardened layer composed of cement-soil mixing piles at the top of the mixing piles needs to be constructed vertically in alternating shallow and deep sections and horizontally in a repeated staggered manner. The equipment is relatively complex, the amount of construction work is relatively large, the construction time is relatively long, the construction speed is relatively slow, and the cost of foundation treatment is relatively high.
[0007] Some technicians use bidirectional mixing drill bits to construct mixing piles, and simultaneously use high-pressure jet grouting devices to enlarge one or more large-diameter sections. However, high-pressure pressurization equipment has very high sealing requirements, and the pressure is difficult to stabilize. The diameter and regularity of the large-diameter section of the jet grouting are difficult to control accurately. In particular, soil collapse is prone to occur when the top jet grouting enlarges the head, so it is impossible to set the enlarged head at the top of each mixing pile. Therefore, it is still difficult to achieve the intended reinforcement effect of preventing soft soil foundation settlement.
[0008] Some technicians use a method where the diameter of the mixing pile is determined by the forward rotation of the mixing drill bit, and the diameter of the enlarged head is determined by the reverse rotation. This method is used to construct mixing piles with a T-shaped enlarged head at the top. Compared to existing technologies, this method improves the amount of work, construction time, construction speed, and foundation treatment costs. However, this mixing equipment is prone to mechanical failures, and there is a possibility that the mixing blades may not expand due to cement sticking to the soil or encountering obstacles such as rocks. In other words, there is uncertainty regarding the presence, shape, and size of the enlarged head, making it difficult to guarantee the reliability, stability, and accuracy of the construction process. Furthermore, the T-shaped enlarged head, which transitions at a right angle to the mixing pile, has significantly insufficient compressive and shear strength, resulting in an unsatisfactory anti-settlement reinforcement effect.
[0009] Furthermore, when the mixing drill bit of all the above-mentioned mixing pile construction equipment is drilled to the lower section of the mixing pile, especially when the mixing pile is quickly drilled to the predetermined depth, the construction process is unstable due to the large distance between the mixing drill bit and the power head. The concentricity and verticality of the enlarged head of the pile and the lower section of the longer mixing pile are affected to a certain extent, which affects the pile quality and the bearing capacity of the pile. Utility Model Content
[0010] The technical problem to be solved by this utility model is to provide a combined bidirectional interlocking device for constructing mixing piles with enlarged heads. It has a simple structure, stable and reliable construction process, and low failure rate. When constructing enlarged heads and mixing piles using this combined bidirectional interlocking device, it can ensure that the diameter of the enlarged head is accurate and regular, the concentricity and perpendicularity of the enlarged head and the mixing pile are good, and the compressive strength, shear strength and bearing capacity of the mixing pile with the enlarged head are greatly enhanced, resulting in a significant reinforcement effect against settlement of soft soil foundations.
[0011] The technical solution of this utility model is to provide a combined bidirectional mixing device for constructing mixing piles with enlarged heads.
[0012] There are two sets of bidirectional mixing devices: one set is a bidirectional mixing device for mixing piles, and the other set is a bidirectional mixing device for enlarged heads.
[0013] The first power head of the bidirectional mixing device for mixing piles is located above the second power head of the bidirectional mixing device for enlarged head. The first drill rod of the bidirectional mixing device for mixing piles passes through the first drill rod passage on the second power head of the bidirectional mixing device for enlarged head. The second mixing head for mixing out the enlarged head is below the second power head. The first mixing head for mixing out the mixing pile is below the second mixing head. The drill bit is below the first mixing head.
[0014] The second stirring head includes multiple second vertical plates that stir out a large diameter enlarged head and multiple inclined plates that stir out a frustum transition section from the outside upper to the inside lower, with each inclined plate fixed to the bottom end of each second vertical plate.
[0015] The first outer drill rod and the second inner drill rod slide together within the inner hole.
[0016] With the above structure, the combined bidirectional mixing device of this utility model for constructing mixing piles with enlarged heads has the following advantages:
[0017] This device combines the advantages of existing mixing equipment while overcoming their respective disadvantages:
[0018] This device can complete the construction of a long mixing pile and the enlarged head at the top for the settlement reinforcement of soft soil foundation in a single drilling and mixing operation. The equipment is relatively simple, the amount of construction work is relatively small, the construction time is relatively short, the construction speed is relatively fast, the construction efficiency is relatively high, the cement and energy consumption is relatively small, and the cost of settlement reinforcement treatment for soft soil foundation is relatively low.
[0019] This device employs a second mixing head, consisting of multiple upper vertical plates and multiple lower inclined plates, to mix the enlarged head and the frustum transition section connecting the mixing piles. This results in minimal physical and mechanical errors, requiring only a conventional, rather than high-pressure, grout delivery mechanism. The failure rate of the grouting and mixing head is low, ensuring a reliable, stable, and accurate construction process. It also ensures the enlarged head has a regular shape and accurate dimensions, allowing for precise placement of the complete and regular enlarged head at the top of each mixing pile. This significantly enhances the technical effectiveness of reinforcing soft soil foundations to prevent settlement.
[0020] Because the expansion head and the mixing pile produced by the combined bidirectional mixing device of this apparatus are connected by a frustum transition section, its compressive strength and shear strength are greatly improved.
[0021] This device also improves the uniformity of pile mixing by having the mixing piles bidirectionally interlocked through the mixing pile bidirectional interlocking device, and the enlarged head undergoes two bidirectional interlocking processes through both the mixing pile bidirectional interlocking device and the enlarged head bidirectional interlocking device. This not only reduces cement consumption but also significantly improves the pile quality of the mixing piles and the enlarged head, further enhancing the remarkable technical effect of reinforcement treatment to prevent settlement of soft soil foundations.
[0022] This device also possesses a significant technical advantage that none of the existing mixing pile equipment possesses: The combined bidirectional mixing device, installed on the pile driver's tower, is arranged from top to bottom as follows: the first power head of the first bidirectional mixing device, the second power head of the second bidirectional mixing device, the second mixing head of the second bidirectional mixing device, the first mixing head of the first bidirectional mixing device, and the drill bit. Specifically, after the first drill rod comes down from the first power head, it passes through the second power head and then slides into the inner hole of the second inner drill rod, providing a longer support section for the first drill rod. This makes the mixing pile construction process more stable, ensuring excellent concentricity and verticality between the enlarged head and the longer section of the mixing pile. This further improves the pile formation quality and bearing capacity of the mixing pile and the enlarged head, and further guarantees the significant technical effect of reinforcement treatment to prevent soft soil foundation settlement.
[0023] Furthermore, the upper ends of both the first inner drill rod and the second outer drill rod are connected to the first power head. The structure of the first mixing head includes: at least a plurality of first inner mixing blades fixed to the lower end of the first inner drill rod; a first mixing frame fixed to the lower end of the first outer drill rod; and a plurality of first outer mixing blades, staggered in height from the first inner mixing blades and bidirectionally mixing with each other, fixed inside the first mixing frame; the drill bit is fixed to the bottom end of the first inner drill rod. This structure further improves the uniformity of bidirectional mixing in the mixing pile, resulting in better pile formation quality and stronger bearing capacity.
[0024] Furthermore, multiple first frame panels constitute the first mixing frame for producing small-diameter mixing piles: the multiple first frame panels are distributed circumferentially, with the inner end of the first upper horizontal plate of each first frame panel fixed to the bottom end of the first outer drill rod, the outer end of the first upper horizontal plate fixed to the upper end of the first vertical plate, the lower end of the first vertical plate fixed to the outer end of the first lower horizontal plate, and the inner end of the first lower horizontal plate fixed to a first lower connecting sleeve, which is rotatably engaged with the bottom end of the second inner drill rod. With this specific structure, the first mixing frame achieves better uniformity in the mixing of the mixing piles, relatively reducing cement consumption and significantly improving the quality of the mixing piles, thereby further enhancing their load-bearing capacity.
[0025] Furthermore, the upper ends of both the second inner drill rod and the second outer drill rod are connected to the second power head. The structure of the second mixing head includes: multiple second inner mixing blades fixed to the lower end of the second inner drill rod; a second mixing frame fixed to the lower end of the second outer drill rod; and multiple second outer mixing blades, staggered in height from the second inner mixing blades and bidirectionally mixing, fixed inside the second mixing frame. The second mixing frame includes an upper vertical plate that mixes out a large-diameter enlarged head and a lower inclined plate that mixes out a frustum transition section from the upper outer edge to the lower inner edge. This structure further improves the uniformity of bidirectional mixing of the enlarged head, resulting in better pile quality, increased compressive and shear strength, and significantly enhanced technical effectiveness in preventing soft soil foundation settlement.
[0026] Furthermore, multiple second-frame panels constitute a second mixing frame for mixing the enlarged head with a large diameter and a frustum-shaped transition section. These second-frame panels are distributed circumferentially. The inner end of the second upper horizontal plate of each second-frame panel is fixed to the bottom end of the second outer drill rod. The outer end of the second upper horizontal plate is fixed to the upper end of the second vertical plate. The lower end of the second vertical plate is fixed to the upper end of the inclined plate. The lower end of the inclined plate is fixed to a second lower connecting sleeve, which rotatably engages with the bottom end of the second inner drill rod. This specific structure of the second mixing frame improves the uniformity of mixing at the enlarged head, further reducing cement consumption, significantly improving the quality of the enlarged head, enhancing its compressive and shear resistance, and enhancing the remarkable technical effect of strengthening the foundation against soft soil settlement.
[0027] Furthermore, the inclined plate is either a straight inclined plate with a smooth outer surface or an inclined stepped plate with multiple steps. With the above structure, the two types of conical transition surfaces produced by the second mixing head can significantly improve the compressive strength, shear strength, and bearing capacity of the mixing pile with the enlarged head. Of course, the straight inclined plate is preferred.
[0028] Furthermore, the second inner drill rod and the second inner driven gear are circumferentially fixed by a gear-type spline; the second outer drill rod and the second outer driven gear are also circumferentially fixed by a gear-type spline. With this structure, the second drill rod exhibits better mechanical properties, flexibility, concentricity, and reliability, further improving construction speed and efficiency, and ultimately enhancing the pile quality of the enlarged head.
[0029] Furthermore, the axes of the first inner drill rod, the first outer drill rod, the second inner drill rod, and the second outer drill rod, from the inside out, are all on the same vertical line. With this structure, the concentricity and reliability of the drill rods are improved, further enhancing the pile formation quality of the enlarged head and the mixing pile. Attached Figure Description
[0030] Figure 1This is a schematic diagram of the structure of the device of this utility model installed on the pile driver. Figure 1 The first drill pipe in the diagram is drawn with its height or length omitted; Figures 1-3 and Figure 14 Steel wire rope omitted; Figure 1 Figure 4 , Figure 13 and Figure 14 (Some bolts and nuts have been omitted).
[0031] Figure 2 yes Figure 1 A magnified structural diagram of A in the diagram.
[0032] Figure 3 yes Figure 1 A magnified structural diagram of B in the diagram.
[0033] Figure 4 yes Figure 1 A magnified structural diagram of C.
[0034] Figure 5 This is a schematic diagram of the inclined plate in the second stirring head, which uses an inclined step plate.
[0035] Figure 6 Is adopted Figure 5 A schematic diagram of the structure of the enlarged head, the mixing pile, and the transition surface of the step formed by the second mixing head composed of the inclined stepped plate.
[0036] Figure 7 yes Figure 1 A magnified structural diagram of D in the diagram.
[0037] Figure 8 yes Figure 2 Enlarged structural diagram after removing the background of the piling machine equipment and the power head housing Figure 1 ( Figures 8-12 The drill rod in the image is drawn with its length omitted.
[0038] Figure 9 yes Figure 2 Enlarged structural diagram after removing the equipment background and power head housing Figure 2 (and Figure 8 (Different angles)
[0039] Figure 10 yes Figure 3 Enlarged structural diagram after removing the equipment background and power head housing Figure 1 .
[0040] Figure 11 yes Figure 3 Enlarged structural diagram after removing the equipment background and power head housing Figure 2 (and Figure 10 (Different angles)
[0041] Figure 12 yes Figure 11 The exploded structure diagram of the second inner drill pipe driven gear and the second outer drill pipe driven gear is shown (omitted). Figure 11 (e.g., motors, gearboxes, and drive gears).
[0042] Figure 13 This is a schematic diagram showing the structure of the first drill pipe passage and the inner hole of the second inner drill pipe displayed by the second power head.
[0043] Figure 14 This is a schematic diagram of a pile driver equipped with the combined bidirectional mixing device of this utility model constructing a mixing pile with an enlarged head (the first drill rod is drawn with its height or length omitted; the enlarged head, the conical transition surface, and the cement and soil inside the mixing pile are omitted).
[0044] As shown in the figure:
[0045] 1. Pile driver; 11. Traveling mechanism; 12. Construction platform; 13. Tower; 14. Winch mechanism; 15. Control room;
[0046] 2. Two-way mixing device for mixing piles, 21. First power head, 211. First power head housing, 212. First inner drill rod motor, 213. First inner drill rod gearbox, 214. First inner drill rod drive gear, 215. First inner drill rod driven gear, 216. First outer drill rod motor, 217. First outer drill rod gearbox, 218. First outer drill rod drive gear, 219. First outer drill rod driven gear, 22. First drill rod, 221. First inner drill rod, 222. First outer drill rod, 23. First mixing head, 231. First inner mixing blade, 232. First mixing frame, 2321. First upper connecting sleeve, 2322. First lower connecting sleeve, 2323. First frame leaf, 23231. First upper horizontal plate, 23232. First vertical plate, 23233. First lower horizontal plate, 233. First outer mixing blade;
[0047] 3. Expanding head bidirectional stirring device; 31. Second power head; 311. Second power head housing; 312. Second inner drill rod motor; 313. Second inner drill rod gearbox; 314. Second inner drill rod drive gear; 315. Second inner drill rod driven gear; 316. Second outer drill rod motor; 317. Second outer drill rod gearbox; 318. Second outer drill rod drive gear; 319. Second outer drill rod driven gear; 3100. First drill rod passage; 32. Second drill rod; 321. Second inner drill rod; 3211. Inner hole; 322. Second outer drill rod; 33. Second stirring head; 331 332. Second inner stirring blade; 3321. Second stirring frame; 3322. Second upper connecting sleeve; 3323. Second lower connecting sleeve; 3323. Second frame leaf; 33231. Second upper horizontal plate; 33232. Second vertical plate; 33233. Inclined plate; 33234. Second lower horizontal plate; 33235. Inclined step plate; 333. Second outer stirring blade; 34. Gear spline; 341. Second inner drill rod gear spline; 342. Second inner drill rod driven gear gear spline; 343. Second outer drill rod gear spline; 344. Second outer drill rod driven gear gear spline.
[0048] 4. Drill bit; 41. Drill tip; 42. Drill bit body; 43. Drill bit agitator blades;
[0049] 5. Soil, 51. Enlarged head, 52. Frustum transition section, 53. Mixing pile, 54. Frustum step transition section;
[0050] 61. Grout delivery pipe; 62. Connector; 63. Grout nozzle. Detailed Implementation
[0051] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0052] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown.
[0053] The present invention relates to a preferred embodiment of a combined bidirectional mixing device for constructing mixing piles with enlarged heads. The pile driver 1 equipped with the combined bidirectional mixing device of the present invention includes a prior art walking mechanism 11, such as a walking mechanism, a construction platform 12, an operating room 15 installed on the construction platform 12, a tower 13 fixed on the construction platform 12, a grout delivery pipe and a grout spraying nozzle, and a power head of the bidirectional mixing device driven by a winch mechanism 14 and vertically slidingly fitted on the tower 13.
[0054] The present invention relates to a preferred embodiment of a combined bidirectional mixing device for constructing mixing piles with enlarged heads. The bidirectional mixing device consists of two sets: one set is a bidirectional mixing device 2 for mixing piles, and the other set is a bidirectional mixing device 3 for enlarged heads.
[0055] The first power head 21 of the bidirectional mixing device 2 for mixing piles is located above the second power head 31 of the bidirectional mixing device 3 for enlarged heads. The first drill rod 22 of the bidirectional mixing device 2 for mixing piles passes through the first drill rod passage 3100 on the second power head 31 of the bidirectional mixing device 3 for enlarged heads. The second mixing head 33 for mixing out the enlarged head 51 is below the second power head 31, and the first mixing head 23 for mixing out the mixing pile 53 is below the second mixing head 33.
[0056] The upper end of the first inner drill rod 221 is connected to the first power head 21, and the upper end of the first outer drill rod 222 is also connected to the first power head 21.
[0057] The specific structure of the first stirring head 23 can be as follows: the lower end of the first inner drill rod 221 is fixed with multiple first inner stirring blades 231, such as two first inner stirring blades 231; the lower end of the first outer drill rod 222 is fixed with a first stirring frame 232; and the inner side of the first stirring frame 232, such as the inner side of the first frame 2323, is fixed with multiple first outer stirring blades 233 that are staggered in height from the first inner stirring blades 231 and stir each other in both directions.
[0058] The specific structure of the first mixing frame 232 can be as follows: multiple or three first frame panels 2323 form the first mixing frame 232 that mixes the mixing pile 53 with a small diameter; the three first frame panels 2323 are evenly distributed along the circumference, such that the included angle between the width bisectors of two adjacent first frame panels 2323 is 120°; the inner end of the first upper horizontal plate 23231 of each first frame panel 2323 is fixed to a first upper connecting sleeve 2321, and the first upper connecting sleeve 2321 is fixed to the first outer... The bottom end of drill rod 222, or alternatively, without the first upper connecting sleeve, can be directly fixed to the bottom end of the first outer drill rod 222. The outer end of the first upper horizontal plate 23231 is fixed to the upper end of the first vertical plate 23232, the lower end of the first vertical plate 23232 is fixed to the outer end of the first lower horizontal plate 23233, and the inner end of the first lower horizontal plate 23233 is fixed to a first lower connecting sleeve 2322. The first lower connecting sleeve 2322 is rotatably engaged with the bottom end of the first inner drill rod 221. Multiple first inner stirring blades 231 are distributed circumferentially along the first inner drill rod 221, and can be evenly distributed. For example, the included angle between the width bisectors of adjacent vertically arranged first inner stirring blades 231 can be 120° to each other. Both the first inner stirring blades 231 and the first outer stirring blades 233 can be transverse stirring blades. The first inner stirring blade 231 can be in three vertical rows, with two blades in each row; the first outer stirring blade 233 corresponds to the first inner stirring blade, such as one first outer stirring blade 233 fixed inside each first frame 2323, for a total of three first outer stirring blades 233.
[0059] The drill bit 4 is fixed to the bottom end of the first inner drill rod 221. The drill bit 4 may include a drill tip 41 at the bottom end, such as the drill tip 41 of a triangular plate. The top of the drill tip 41 is the drill bit body 42, and drill bit stirring blades 43 are symmetrically arranged on both sides of the drill bit body 42. The grouting nozzle 63 may be provided on the drill bit body 42, and the grouting nozzle 63 is connected to the grouting pipe 61 provided in the first inner drill rod 221.
[0060] The second drill pipe 32 includes a second inner drill pipe 321 and a second outer drill pipe 322. The upper end of the second inner drill pipe 321 is connected to the second power head 31, and the upper end of the second outer drill pipe 322 is also connected to the second power head 31.
[0061] The specific structure of the second stirring head 33 can be as follows: multiple second inner stirring blades 331 are fixed at the lower end of the second inner drill rod 321. A second stirring frame 332 is fixed at the lower end of the second outer drill rod 322. Multiple second outer stirring blades 333 are fixed on the inner side of the second stirring frame 332, such as the inner side of the second frame 3323, and are staggered in height from the second inner stirring blades 331 and stir each other in both directions.
[0062] The second stirring head 33 includes multiple second vertical plates 33232 that stir out a large diameter enlarged head 51 and multiple inclined plates 33233 that stir out a frustum transition section 52 from the outside upper to the inside lower, with each inclined plate 33233 fixed to the bottom end of each second vertical plate 33232.
[0063] The specific structure of the second stirring frame 332 can be as follows: multiple or even three second frame panels 3323 form the second stirring frame 332 that stirs the large-diameter enlarged head 51 and the frustum transition section 52; the three second frame panels 3323 can be evenly distributed along the circumference, such as the included angle between the width bisectors of adjacent second frame panels 3323 being 120°; the inner end of the second upper horizontal plate 33231 of each second frame panel 3323 is fixed to a second upper connecting sleeve 3321, and the second upper connecting sleeve 3321 is fixed to the bottom end of the second outer drill rod 322. Of course, the second upper connecting sleeve can be omitted. The second upper horizontal plate is directly fixed to the bottom end of the second outer drill rod; the outer end of the second upper horizontal plate 33231 is fixed to the upper end of the second vertical plate 33232, the lower end of the second vertical plate 33232 is fixed to the upper end of the inclined plate 33233, the lower end of the inclined plate 33233 is fixed to the outer end of the second lower horizontal plate 33234, and the inner end of the second lower horizontal plate 33234 is fixed to a second lower connecting sleeve 3322. Alternatively, the second lower horizontal plate can be omitted, and the lower end of the inclined plate can be directly fixed to the second lower connecting sleeve 3322. The second lower connecting sleeve 3322 is rotatably engaged with the bottom end of the second inner drill rod 321. Multiple second inner stirring blades 331 are distributed along the circumference of the second inner drill rod 321 and can be evenly distributed. For example, if the included angle of the width bisectors of adjacent vertically arranged second inner stirring blades 331 is 120°, there can be three rows, with three second inner stirring blades 331 arranged vertically in each row. All second inner stirring blades 331 can be horizontal stirring blades. The second outer stirring blade 333 fixed inside each of the multiple or three second frame pages 3323 of the second stirring frame 332 can be two blades. That is, one second outer stirring blade 333 fixed on the second vertical plate 33232 can be a horizontal stirring blade, and one second outer stirring blade 333 fixed on the inclined plate 33233 can be an inclined stirring blade with the outer bottom and the inner top.
[0064] The inclined plate 33233 is preferably... Figure 4 The outer surface of the plate shown is a smooth, straight, sloping plate, and the frustum transition section 52 is preferably a smooth frustum transition section. Of course, it could also be... Figure 5 The diagram shows a sloping step plate 33225 with multiple steps. The second frame 3323, composed of multiple sloping step plates 33225 and other plates, is stirred to form a frustum-shaped step transition section 54 with multiple diameter steps.
[0065] The second upper horizontal plate 33231 is fixed to the second vertical plate 33232, the second vertical plate 33232 is fixed to the inclined plate 33233, and the inclined plate 33233 is fixed to the second lower horizontal plate 33234. This can be achieved by repeatedly bending a long strip plate, with all corners being arc-shaped transition surfaces. The angle between the expanded head 51 and the frustum transition section 52 is an arc angle, as is the angle between the frustum transition section 52 and the mixing pile 53. Of course, the plates can also be aligned and welded together, with the corners being right angles or obtuse angles.
[0066] The first outer drill rod 222 and the inner hole 3211 of the second inner drill rod 321 are in sliding fit.
[0067] Two rolling bearings can be provided between the first inner drill rod 221 and the first outer drill rod 222, and two rolling bearings can also be provided between the second inner drill rod 321 and the second outer drill rod 322, so that the rotation is more flexible and the concentricity is better.
[0068] The specific structure of the first power head 21 and the specific structure connecting the upper ends of the first inner drill rod 221 and the upper ends of the first outer drill rod 222 to the first power head 21 can be as follows: The lower ends of the first inner drill rod motor 212 and the second outer drill rod motor 216, each with its own gearbox, are vertically and parallelly fixed inside the first power head housing 211. The first inner drill rod drive gear 214, coaxially fixed on the output shaft of the first inner drill rod gearbox 213, meshes horizontally with the first inner drill rod driven gear 215, coaxially fixed on the top end of the first inner drill rod 221. The first outer drill rod drive gear 218, coaxially fixed on the output shaft of the first outer drill rod gearbox 217, meshes horizontally with the first outer drill rod driven gear 219, coaxially fixed on the top end of the first outer drill rod 222. Relatively speaking, the first outer drill rod driven gear 219 and the first outer drill rod drive gear 218 are at the bottom, and the first inner drill rod driven gear 215 and the first inner drill rod drive gear 214 are at the top.
[0069] The specific structure of the second power head 31 and the specific structure connecting the upper ends of the second inner drill rod 321 and the upper ends of the second outer drill rod 322 to the second power head 31 can be as follows: the lower ends of the second inner drill rod motor 312 and the second outer drill rod motor 316, each with its own gearbox, are vertically and parallelly fixed inside the second power head housing 311. The second inner drill rod drive gear 314, coaxially fixed on the output shaft of the second inner drill rod gearbox 313, meshes horizontally with the second inner drill rod driven gear 315, coaxially fixed on the top end of the second inner drill rod 321. The second outer drill rod drive gear 318, coaxially fixed on the output shaft of the second outer drill rod gearbox 317, meshes horizontally with the second outer drill rod driven gear 319, coaxially fixed on the top end of the second outer drill rod 322. Relatively speaking, the second outer drill rod driven gear 319 and the second outer drill rod drive gear 318 are below, and the second inner drill rod driven gear 315 and the second inner drill rod drive gear 314 are above.
[0070] The second inner drill rod 321 and the second inner drill rod driven gear 315 can be circumferentially fixed or circumferentially limited by a gear spline 34. The gear spline 34 can be exemplified by the mutually meshing gear spline 341 of the second inner drill rod and gear spline 342 of the second inner drill rod driven gear. Similarly, the second outer drill rod 322 and the second outer drill rod driven gear 319 can also be circumferentially fixed by a gear spline 34. The gear spline 34 can be exemplified by the mutually meshing gear spline 343 of the second outer drill rod and gear spline 344 of the second outer drill rod driven gear. It is easy to understand that, except for this section which uses the aforementioned gear spline 34 for circumferential fixation, the fixation of the other gears to the drill rod can be achieved by a key and keyway, thus mutually circumferentially limiting each other.
[0071] The axes of the first inner drill rod 221, the first outer drill rod 222, the second inner drill rod 321, and the second outer drill rod 322, from the inside out, can all be on the same vertical line. With this structure, the concentricity and reliability of the drill rods are improved, further enhancing the pile formation quality of the enlarged head and the mixing pile.
[0072] The first drill pipe passage 3100 on the second power head 31, as described above, is generally located on the cover plate of the second power head 31 and can have two structures, one of which is... Figure 4 The first design features a through hole on the cover plate of the second power head 31, allowing the first outer drill rod 222 to pass through. There is a significant gap between the first outer drill rod 222 and the wall of the through hole. The second design features a perforated cover plate of the second power head 31, also providing a large gap for the first outer drill rod 222 to pass through. It is easy to understand that the upper end of the second inner drill rod 321 is on the second power head 31, and there is no obstruction between the inner hole 3211 at the upper end of the second inner drill rod 321 and the first drill rod passage 3100 on the cover plate of the second power head 31. Therefore, the first outer drill rod 222 only needs to pass through the first drill rod passage 3100 and the inner hole 3211 at the upper end of the second inner drill rod 321 to pass through the second power head 31. The passage is also called a channel.
[0073] The top end of the grout delivery pipe 61, which is fixed inside the drill rod, such as the first inner drill rod 221, has a connector 62 for connecting to the grout inlet pipe. The grout inlet pipe is connected to the grout pump and grout pool located on the ground. The bottom end of the grout delivery pipe 61 is connected to multiple grout spraying ports 63 on the drill bit 4, such as multiple grout spraying ports 63 located on the drill bit body 42 described below.
[0074] The preferred embodiment of this utility model, a combined bidirectional mixing device for constructing mixing piles with enlarged heads, can be implemented using the following construction steps after installation on a pile driver:
[0075] 1) The walking mechanism 11 is operated to align the axis of the drill bit 4 of the combined bidirectional mixing device of the pile driver 1 with the construction position of the mixing pile 53. Of course, the mixing pile 53 refers to the mixing pile 53 with an enlarged head 51 at the top and the enlarged head 51 and the mixing pile 53 are a frustum transition section 52.
[0076] 2) Operation of the bidirectional mixing device 2 for mixing piles: Power is turned on to make the first power head 21 rotate. At the same time, the winch mechanism 14 is controlled to drive the uppermost first power head 21 and drive the lowermost bidirectional mixing head 23 and drill bit 4 to rotate and drill down through the first inner drill rod 221 and the first outer drill rod 222 of the first drill rod 22 and mix. Multiple grouting nozzles 63 on the drill bit 4 spray grout at the same time to construct the mixing pile 53.
[0077] Operating the bidirectional stirring device 3 of the enlarged head: Turn on the power to make the second power head 31 rotate, and at the same time control the winch mechanism 14 to drive the second power head 31 located below the first power head 21, and drive the second inner drill rod 321 and the second outer drill rod 322 located above the first stirring head 23 to rotate and stir downwards, thus constructing the enlarged head 51.
[0078] 3) Operation: The mixing pile bidirectional mixing device 2 moves downward to construct the mixing pile 53, and the enlarged head bidirectional mixing device 3 moves downward to construct the enlarged head 51; or the mixing pile bidirectional mixing device 2 moves downward to construct the mixing pile 53, and the enlarged head bidirectional mixing device 3 rotates in place or stops in place; or the mixing head bidirectional mixing device 2 rotates in place or stops in place when it reaches the predetermined depth, and the enlarged head bidirectional mixing device 3 moves downward to construct the enlarged head; until the mixing pile 51 constructed by the mixing pile bidirectional mixing device 2 reaches the predetermined depth, and the enlarged head 51 constructed by the enlarged head bidirectional mixing device 3 reaches the predetermined depth, at this time, at the connection between the enlarged head 51 and the mixing pile 53, the second mixing head 33, which includes multiple upper second vertical plates 33232 and multiple lower inclined plates 33233, stirs out the enlarged head 51 and the frustum transition section 52 connecting the mixing pile 53.
[0079] 4) Operation: Stop spraying grout at the spray nozzle 63, and keep the first power head 21, the first inner drill rod 221, the first outer drill rod 222, the first mixing head 23 and the drill bit 4 rotating. At the same time, keep the second power head 31, the second inner drill rod 321, the second outer drill rod 322 and the second mixing head 33 rotating. The mixing pile bidirectional mixing device 2 moves upward first, followed by the enlarged head bidirectional mixing device 3, or both devices, namely the mixing pile bidirectional mixing device 2 and the enlarged head bidirectional mixing device 3, move upward simultaneously until the drill bit at the bottom of the first power head 21, the second power head 31, the second mixing head 33, the first mixing head 23 and the drill bit 4 arranged from top to bottom, is lifted above the ground. Then, turn off the power supply to the winch mechanism 14 and the first power head 21 and the second power head 31.
[0080] The walking mechanism is moved laterally and steps 1)-4) are repeated. After the construction of one row of mixing piles 53 with enlarged heads 51 is completed, the piles are moved longitudinally backward and steps 1)-4) are repeated to construct the second row of mixing piles 53 with enlarged heads 51. Then, mixing piles 53 with enlarged heads 51 are constructed row by row until the reinforcement treatment of the soft soil foundation for anti-settlement is completed piece by piece.
[0081] It is easy to understand that the pile driver 1 can also be called a drilling rig, a mixing drilling rig, or a mixing drilling equipment. The pile driver 1 may also include a control device in the operator's cab 15. The cylinders of the traveling mechanism 11, the winch of the hoisting mechanism 14, the first inner drill rod motor 212, the first outer drill rod motor 216, the second inner drill rod motor 312 and the second outer drill rod motor 316, the slurry pump, etc., are all electrically connected to and driven by the control device, such as a main controller or a computer. The power head housing 211 is also called the power head shell. The first inner drill rod 221, the first outer drill rod 222, the second inner drill rod 321 and the second outer drill rod 322 are all made of steel pipes, and the slurry delivery pipe 61 can be made of plastic pipe. The reinforcement treatment of soft soil foundation is also called the solidification treatment of soft soil foundation. The vertical plate is also called the vertical plate. The horizontal plate is also called the horizontal plate. The frame leaf is also called the frame leaf. Multiple leaves include two or more leaves, such as two leaves, three leaves or four leaves. The gearbox is also called the gearbox or reduction gearbox or reducer. Coaxial fixing refers to fixing along the same axis. The enlarged head 51 is also called the enlarged head of the mixing pile. The frustum transition section 52 is also called the frustum-cone transition section, frustum transition surface, or frustum-cone transition surface. The fixing can be achieved by welding or by using multiple screws or bolts / nuts.
[0082] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.
[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A combined bidirectional mixing device for constructing mixing piles with enlarged heads, characterized in that: There are two sets of bidirectional mixing devices: one set is a bidirectional mixing device for mixing piles, and the other set is a bidirectional mixing device for enlarged heads. The first power head of the bidirectional mixing device for the mixing pile is located above the second power head of the enlarged head bidirectional mixing device, and the first drill rod of the bidirectional mixing device for the mixing pile passes through the first drill rod passage on the second power head of the enlarged head bidirectional mixing device. The second mixing head for mixing out the enlarged head is below the second power head; the first mixing head for mixing out the mixing pile is below the second mixing head; and the drill bit is below the first mixing head. The second stirring head includes multiple second vertical plates that stir out a large diameter enlarged head and multiple inclined plates that stir out a frustum transition section from the outside upper to the inside lower, with each inclined plate fixed to the bottom end of each second vertical plate. The first outer drill rod and the second inner drill rod slide together within the inner hole.
2. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: The upper ends of the first inner drill rod and the upper ends of the second outer drill rod are both connected to the first power head; the structure of the first stirring head includes: at least a plurality of first inner stirring blades fixed at the lower end of the first inner drill rod, a first stirring frame fixed at the lower end of the first outer drill rod, and a plurality of first outer stirring blades that are staggered in height from the first inner stirring blades and stir each other in both directions fixed inside the first stirring frame; the drill bit is fixed at the bottom end of the first inner drill rod.
3. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 2, characterized in that: Multiple first frame panels constitute the first mixing frame for mixing piles with small diameters: multiple first frame panels are distributed circumferentially, the inner end of the first upper horizontal plate of each first frame panel is fixed to the bottom end of the first outer drill rod, the outer end of the first upper horizontal plate is fixed to the upper end of the first vertical plate, the lower end of the first vertical plate is fixed to the outer end of the first lower horizontal plate, the inner end of the first lower horizontal plate is fixed to a first lower connecting sleeve, and the first lower connecting sleeve is rotatably engaged with the bottom end of the second inner drill rod.
4. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 2, characterized in that: The upper ends of the second inner drill rod and the second outer drill rod are both connected to the second power head; the structure of the second stirring head includes: multiple second inner stirring blades fixed at the lower end of the second inner drill rod, a second stirring frame fixed at the lower end of the second outer drill rod, and multiple second outer stirring blades that are staggered in height from the second inner stirring blades and stir each other in both directions fixed inside the second stirring frame; the second stirring frame includes a second vertical plate in the upper part that stirs out a large-diameter enlarged head and an inclined plate in the lower part that stirs out a frustum transition section from the outside upper to the inside lower.
5. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 4, characterized in that: Multiple second frame panels constitute a second stirring frame for stirring out a large-diameter enlarged head and a frustum transition section: the multiple second frame panels are distributed along the circumference, the inner end of the second upper horizontal plate of each second frame panel is fixed to the bottom end of the second outer drill rod, the outer end of the second upper horizontal plate is fixed to the upper end of the second vertical plate, the lower end of the second vertical plate is fixed to the upper end of the inclined plate, the lower end of the inclined plate is fixed to a second lower connecting sleeve, and the second connecting sleeve is rotatably engaged with the bottom end of the second inner drill rod.
6. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 5, characterized in that: The inclined plate is a straight inclined plate with a smooth outer surface, or an inclined stepped plate with multiple steps.
7. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: The second inner drill rod and the second inner driven gear are circumferentially fixed by a gear-type spline; the second outer drill rod and the second outer driven gear are also circumferentially fixed by a gear-type spline.
8. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: The first inner drill pipe axis, the first outer drill pipe axis, the second inner drill pipe axis, and the second outer drill pipe axis are all on the same vertical line from the inside to the outside.