Combined bidirectional mutual stirring device for construction zone expansion head mixing pile
The bidirectional mixing technology of the combined bidirectional mixing device solves the problems of complex, slow construction and high cost of existing mixing pile equipment, and achieves a fast and stable reinforcement effect on soft soil foundation. It ensures the concentricity and verticality of the enlarged head and the mixing pile, and improves the pile quality and anti-settlement ability.
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
- 2026-07-21
AI Technical Summary
Existing mixing pile equipment has problems such as complex equipment, long construction time, high cost, uncertain shape and size of enlarged head, and unstable pile quality when constructing large areas of soft soil foundations, making it difficult to effectively prevent settlement of soft soil foundations.
A combined bidirectional mixing device is adopted, including an enlarged head and a mixing head for the mixing pile. The construction of the long mixing pile and the enlarged head is completed in one go through bidirectional mixing technology, ensuring the concentricity and verticality of the enlarged head and the mixing pile. A simple shotcrete mechanism and low failure rate equipment are used to improve compressive and shear resistance.
It achieves rapid, stable, and low-cost reinforcement of soft soil foundations, with accurate enlarged head shape and size, high pile quality, and significantly improved anti-settlement effect.
Smart Images
Figure CN224531653U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pile driver 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 pile driver for mixing piles is relatively mature. During construction, the hoisting equipment drives the power head to rotate and drill through the mixing drill bit to stir the soil. At the same time, cement slurry is sprayed out through the slurry pipe in the drill rod and the nozzle on the mixing drill bit. After the cement slurry solidifies, it becomes a mixing pile.
[0003] Existing drill rod technology has evolved from unidirectional rotation to bidirectional rotation of the inner and outer drill rods; while existing mixing drill bits 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 upper hardened layer with this equipment needs to be completed in two stages. In particular, the hardened layer composed of cement-soil mixing piles on top of the mixing piles needs to be constructed vertically with alternating shallow and deep sections and horizontally with repeated alternations. The equipment is relatively complex, the amount of construction 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, while simultaneously using 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 upper jet grouting enlarges the head, so it is impossible to place the enlarged head at the upper end 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 mixing drill bit rotates forward to determine the diameter of the mixing pile, and reverses to determine the enlarged diameter, 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 type of pile driver is prone to mechanical failures, and there is a possibility that the mixing blades may not enlarge due to cement sticking to the soil or encountering obstacles such as rocks. This introduces 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, with its right-angle transition 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 equipment is drilled to the lower section of the mixing pile, especially when it is close 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 pile bearing capacity. Utility Model Content
[0010] The technical problem to be solved by this utility model is to provide a combined bidirectional mixing device for constructing mixing piles with enlarged heads. It has a simple structure, stable and reliable construction process, and low failure rate. By using the combined bidirectional mixing device to construct enlarged heads and mixing piles, it can ensure that the diameter of the enlarged heads is accurate and regular, the concentricity and verticality of the enlarged heads and mixing piles are good, and the compressive strength, shear strength and bearing capacity of the mixing piles with enlarged heads 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] The combined bidirectional mixing device has two mixing heads: one is an enlarged head mixing head, and the other is a mixing pile mixing head.
[0013] Multiple first outer stirring blades are fixed on the first stirring frame of the enlarged head's stirring head. The upper end of the first outer drill rod is connected to the power head, and the lower end of the first outer drill rod is connected to the first stirring frame.
[0014] The second mixing frame of the mixing head of the mixing pile is fixed with multiple second outer mixing blades. The upper end of the second outer drill rod is connected to the first mixing frame, and the lower end of the second outer drill rod is connected to the second mixing frame.
[0015] The second outer drill pipe is coaxial with the first outer drill pipe;
[0016] The inner drill rod rotates within the first and second outer drill rods, and the upper end of the inner drill rod is connected to the power head.
[0017] Multiple first inner stirring blades are fixed on the inner drill rod of the stirring head section of the enlarged head. The first inner stirring blades and the first outer stirring blades are staggered in height and stir each other in opposite directions.
[0018] Multiple second inner mixing blades are fixed on the inner drill rod of the mixing head section of the mixing pile. The second inner mixing blades and the second outer mixing blades are staggered in height and mix with each other in opposite directions.
[0019] The lower end of the inner drill rod is rotatably engaged with the lower connecting sleeve of the second mixing frame.
[0020] With the above structure, the combined bidirectional mixing device of this utility model for constructing mixing piles with enlarged heads has the following advantages:
[0021] This combined bidirectional mixing device completes the settlement reinforcement of a long mixing pile and the enlarged head at the top of the pile 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 foundations is relatively low.
[0022] The constructed enlarged head, mixing pile, and frustum transition section connecting the enlarged head and mixing pile have small physical and mechanical errors, requiring only conventional rather than high-pressure grouting mechanisms. The failure rate of the grouting and mixing head is low, and the construction process is reliable, stable, and accurate. This ensures that the shape and size of the enlarged head are regular and accurate, allowing the complete and regular enlarged head to be accurately placed at the top of each mixing pile. Furthermore, the compressive strength, shear strength, and bearing capacity of the enlarged head, frustum transition section, and mixing pile are all significantly improved, resulting in a remarkable technical effect in the reinforcement treatment to prevent settlement of soft soil foundations.
[0023] 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.
[0024] This combined bidirectional mixing device achieves good uniformity in pile mixing because the mixing piles are bidirectionally hinged by the mixing heads of the mixing pile bidirectional mixing device, and the enlarged head is bidirectionally mixed twice by the mixing heads of the mixing pile bidirectional mixing device and the enlarged head bidirectional mixing device. This not only reduces cement consumption but also significantly improves the pile quality of the mixing piles and the enlarged head, thus enhancing the remarkable technical effect of strengthening the foundation to prevent settlement of soft soil.
[0025] This combined bidirectional mixing device has a significant technical advantage that is not found in any existing mixing pile equipment: because the first and second outer drill rods are arranged vertically and on the same axis as if they were on the same vertical line, and most of the first drill rod that fixes the second inner transverse mixing blade of the mixing pile rotates and engages within the first and second outer drill rods, the construction process of the mixing pile is stable. This ensures good concentricity and verticality between the enlarged head and the lower, longer section of the mixing pile, significantly improving the pile quality and bearing capacity of the mixing pile and the enlarged head, and further guaranteeing the remarkable technical effect of reinforcement treatment to prevent settlement of soft soil foundations.
[0026] Furthermore, multiple first frame panels constitute the first mixing frame of the enlarged head's mixing head: 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 lower 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 upper end of the first inclined plate, and the lower end of the first inclined plate fixed to the upper end of the second outer drill rod. With this structure, the bidirectional mixing of the enlarged head improves the uniformity of mixing, relatively reducing cement consumption and significantly improving the pile formation quality of the enlarged head, further enhancing its compressive and shear resistance.
[0027] Furthermore, multiple second-frame panels constitute the second mixing frame of the mixing head for the mixing pile: the multiple second-frame panels are distributed circumferentially; the inner end of the second upper horizontal plate of each second-frame panel is fixed to the lower 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 second inclined plate, the lower end of the second inclined plate is fixed to the first lower connecting sleeve, and the first lower connecting sleeve is rotatably engaged with the lower end of the inner drill rod. With the above structure, even without a drill bit, the tapered lower end of the second mixing frame can adapt to the construction of mixing piles on most soft soil foundations. Moreover, the bidirectional mixing of the second mixing head improves the uniformity of mixing in the mixing pile, which can relatively reduce cement consumption and significantly improve the quality of the mixing pile, further enhancing its bearing capacity.
[0028] Furthermore, a drill bit is fixed to the lower end of the inner drill rod. This structure provides another type of mixing head for the mixing pile. The lower end of the mixing head, specifically the third mixing head, does not have an inclined plate but instead has a lower horizontal plate. However, a drill bit is placed below the third mixing head, increasing the drilling capacity and making it more adaptable to soft soil foundations. This also makes the mixing process of the mixing pile more stable, reliable, and with better uniformity.
[0029] Furthermore, multiple third-frame panels constitute the third mixing frame of another mixing head for the mixing pile: the multiple frames are distributed circumferentially; the inner end of the third upper horizontal plate of each third frame panel is fixed to the lower end of the second outer drill rod, the outer end of the third upper horizontal plate is fixed to the upper end of the third vertical plate, the lower end of the third vertical plate is fixed to the outer end of the third lower horizontal plate, the inner end of the third lower horizontal plate is fixed to the second lower connecting sleeve, and the second lower connecting sleeve is rotatably engaged with the lower end of the second inner drill rod; multiple third outer mixing blades are fixed to the third mixing frame of the mixing head of the mixing pile, and multiple third inner mixing blades are fixed to the inner drill rod located in the mixing head section of the mixing pile. The third inner mixing blades and the third outer mixing blades are staggered in height and mix towards each other. With the above structure, when a drill bit is installed, the mixing head of the mixing pile can be replaced by the third mixing head to better adapt to different soil conditions and improve the mixing quality of the mixing pile. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the combined bidirectional stirring device of this utility model. Figure 1 The first drill pipe in the diagram is drawn with its length 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 This is a schematic diagram of the structure of Embodiment 2 of the combined bidirectional stirring device of this utility model. Figure 4 The first drill pipe in the diagram is drawn with its length omitted.
[0034] Figure 5 yes Figure 4 A magnified structural diagram of C.
[0035] Figure 6 Enlarged structural diagram of the power head housing (omitting the power head housing) Figure 1 ( Figures 6-1 The drill rod in 0 is drawn with its length omitted.
[0036] Figure 7 This is an enlarged structural diagram omitting the power head housing. Figure 2 (and Figure 6 (Different angles)
[0037] Figure 8 This is a schematic diagram of a pile driver equipped with the combined bidirectional mixing device of Embodiment 2 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).
[0038] As shown in the figure:
[0039] 1. Pile driver; 11. Traveling mechanism; 12. Construction platform; 13. Tower; 14. Winch mechanism; 15. Control room;
[0040] 21. Agitator head of enlarged head; 211. First agitator frame; 2111. First outer agitator blade; 2112. First frame leaf; 21121. First upper horizontal plate; 21122. First upper connecting sleeve; 21123. First vertical plate; 21124. First inclined plate; 21125. First lower horizontal plate; 22. First outer drill rod; 23. First inner agitator blade;
[0041] 31. A mixing head for a mixing pile; 311. A second mixing frame; 3111. A second outer mixing blade; 3112. A second frame leaf; 31121. A second upper horizontal plate; 31122. A second upper connecting sleeve; 31123. A second vertical plate; 31124. A second inclined plate; 31125. A first lower connecting sleeve; 32. A second outer drill rod; 33. A second inner mixing blade; 34. An inner drill rod.
[0042] 41. Another mixing head of the mixing pile; 411. Third mixing frame; 4111. Third outer mixing blade; 4112. Third frame leaf; 41121. Third upper horizontal plate; 41122. Third upper connecting sleeve; 41123. Third vertical plate; 41124. Second lower horizontal plate; 41125. Second lower connecting sleeve; 42. Flange; 43. Third inner mixing blade; 44. Bolts and nuts.
[0043] 5. Power head; 51. Power head housing; 52. Inner drill pipe motor; 53. Inner drill pipe gearbox; 54. Inner drill pipe drive gear; 55. Inner drill pipe driven gear; 56. Outer drill pipe motor; 57. Outer drill pipe gearbox; 58. Outer drill pipe drive gear; 59. Outer drill pipe driven gear.
[0044] 61. First spray nozzle; 62. Second spray nozzle; 63. Connector;
[0045] 7. Soil; 71. Enlarged head; 72. Frustum transition section; 73. Mixing pile;
[0046] 8. Drill bit; 81. Drill tip; 82. Drill bit body; 83. Drill bit agitator blades. Detailed Implementation
[0047] 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.
[0048] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 Figure 7 and Figure 8 As shown.
[0049] The existing pile driver 1 for constructing mixing piles may include a traveling mechanism 11, a construction platform 12, a tower 13 or column, a winch mechanism 14, and an operator's cab 15, etc.
[0050] This utility model relates to an embodiment of a combined bidirectional mixing device for constructing mixing piles with enlarged heads. The combined bidirectional mixing device has two mixing heads: one is the mixing head 21 of the enlarged head, and the other is the mixing head of the mixing pile. The mixing head of the mixing pile can be one mixing head 31 and another mixing head 41 of the mixing pile, as described below.
[0051] At least one or more first outer stirring blades 2111 are fixed on the first stirring frame 211 of the enlarged stirring head 21. As described below, each first frame 2112 has two first outer stirring blades 2111, for a total of six. One blade in each frame can be a horizontal stirring blade, and another blade in each frame can be an oblique stirring blade. The upper end of the first outer drill rod 22 is connected to the power head 5, and the lower end of the first outer drill rod 22 is connected to the first stirring frame 211.
[0052] The second mixing frame 311 of the mixing head 31 of the mixing pile is fixed with multiple second outer mixing blades 3111. As described below, each second frame 3112 is fixed with one, for a total of three second outer mixing blades 3111, which can be horizontal mixing blades. The upper end of the second outer drill rod 32 is connected to the first mixing frame 211, and the lower end of the second outer drill rod 32 is connected to the second mixing frame 311.
[0053] The second outer drill pipe 32 is coaxial with the first outer drill pipe 22.
[0054] The inner drill rod 34 is rotatably fitted within the first outer drill rod 22 and the second outer drill rod 32, and the upper end of the inner drill rod 34 is connected to the power head 5.
[0055] Multiple first inner stirring blades 23 are fixed on the inner drill rod 34 of the stirring head 21 section of the enlarged head. There are three first inner stirring blades 23, corresponding to the two first outer stirring blades 2111 of each blade, for a total of nine first inner stirring blades 23. The first inner stirring blades 23 and the first outer stirring blades 2111 are staggered in height and stir each other in opposite directions. All first inner stirring blades 23 can be horizontal stirring blades.
[0056] Multiple second inner mixing blades 33 are fixed on the inner drill rod 34 of a mixing head 31 section of the mixing pile. There are six second inner mixing blades 33, such as two blades corresponding to one second outer mixing blade 2111 of each blade. The second inner mixing blades 33 and the second outer mixing blades 3111 are staggered in height and stir each other in opposite directions. All second inner mixing blades 33 can be horizontal mixing blades.
[0057] The lower end of the inner drill rod 34 is rotatably engaged with the second lower connecting sleeve 31225 of the second stirring frame 311.
[0058] Multiple first frame panels 2112 constitute the first stirring frame 211 of the stirring head 21 of the enlarged head, such as three first frame panels 2112 constituting the first stirring frame 211 of the stirring head 21 of the enlarged head. The specific structure is described as follows: the multiple first frame panels 2112 are distributed circumferentially, preferably evenly distributed circumferentially, such as the angle between the width bisectors of adjacent first frame panels 2112 being 120° to each other; the inner end of the first upper horizontal plate 21121 of each first frame panel 2112 is fixed to the lower end of the first outer drill rod 22, such as a first upper connecting sleeve 21122 fixed to the lower end of the first outer drill rod 22, with the first upper horizontal plate 21121 fixed to the first upper connecting sleeve 21122. Alternatively, the first upper connecting sleeve 21122 can be omitted, and the inner end of the first upper horizontal plate can be directly connected to the lower end of the first outer drill rod 22. The ends are fixed; the outer end of the first upper horizontal plate 21121 is fixed to the upper end of the first vertical plate 21123, and the lower end of the first vertical plate 21123 is fixed to the upper end of the first inclined plate 21124; the lower end of the first inclined plate 21124 is fixed to the upper end of the second drill rod 32. This can have two structures: the lower end of the first inclined plate 21124 is fixed to the outer end of the first lower horizontal plate 21125, and the inner end of the first lower horizontal plate 21125 is fixed to the upper end of the second outer drill rod 32; or the first lower horizontal plate 21125 is omitted, and the lower end of the first inclined plate is directly fixed to the lower end of the second outer drill rod. The stirring head 21 of the enlarged head can be called the first stirring head. The stirring head 21 of the enlarged head is used to stir the large-diameter enlarged head 71 and the frustum transition section 72.
[0059] First embodiment: Multiple second frame panels 3112 constitute the second mixing frame 311 of a mixing head 31 in a mixing pile, such as three second frame panels 3112 constituting the second mixing frame 311 of a mixing head 31 in a mixing pile. The specific structure is described as follows: Multiple second frame panels are distributed along the circumference, preferably evenly distributed along the circumference, such as the included angle between the width bisectors of adjacent second frame panels 3112 being 120° to each other; the inner end of the second upper horizontal plate 31121 of each second frame panel 3112 is fixed to the lower end of the second outer drill rod 32, such as a second upper connecting sleeve 31122 fixed to the lower end of the second outer drill rod 32, and the inner end of the second upper horizontal plate 31121 fixed to the second upper connecting sleeve 31122. Alternatively, the second upper connecting sleeve 31122 can be omitted, and the inner end of the second upper horizontal plate can be directly fixed to the lower end of the second outer drill rod 32. The outer end of the second upper horizontal plate 31121 is fixed to the upper end of the second vertical plate 31123, the lower end of the second vertical plate 31123 is fixed to the upper end of the second inclined plate 31124, and the lower end of the second inclined plate 31124 is fixed to the first lower connecting sleeve 31225. This can be achieved in two structures: the lower end of the second inclined plate 31224 is directly fixed to the first lower connecting sleeve 31225, or the lower end of the second inclined plate is fixed to the outer end of a lower horizontal plate, and the inner end of the lower horizontal plate is fixed to the first lower connecting sleeve 31225. The first lower connecting sleeve 31225 is rotatably engaged with the lower end of the inner drill rod 34. A mixing head 31 of the mixing pile can be called a second mixing head. The mixing head 31 of the mixing pile is used to mix a small-diameter mixing pile 73 with a frustum-shaped lower end. A circular sealing plate can be provided at the lower end of the inner drill rod 34.
[0060] Another embodiment, namely the second embodiment, is possible:
[0061] A drill bit 8 may be fixed at the lower end of the inner drill rod 34. The drill bit 8 is fixed at the lower end of the inner drill rod 34 and may include a drill tip 81 at the lowermost end, such as a drill tip 81 of a triangular plate, a drill body 82 at the upper end of the drill tip 81, and drill stirring blades 83 symmetrically arranged on both sides of the drill body 82.
[0062] A flange 42 can be installed on the second outer drill rod 32, and multiple bolts and nuts 44 are used to fix the flange 42. The second outer drill rods 32 above and below the flange 42 are coaxial. With the above structure, the mixing head of the mixing pile can be replaced according to actual needs, making it more adaptable.
[0063] Multiple third frame panels 4112 constitute the third mixing frame 411 of another mixing head 41 of the mixing pile. For example, three third frame panels 4112 constitute the third mixing frame 411 of another embodiment. The specific structure is described as follows: multiple third frame panels are distributed along the circumference, preferably evenly distributed along the circumference, such as the included angle between the width bisectors of two adjacent third frame panels 4112 is 120°; the inner end of the third upper horizontal plate 41121 of each third frame panel 4112 is fixed to the lower end of the second outer drill rod 32, such as a third upper connecting sleeve 41122 fixed to the lower end of the second outer drill rod 32, and the inner end of the third upper horizontal plate 41121 is fixed to the third upper connecting sleeve 41122. Alternatively, the third upper connecting sleeve 41122 can be omitted, and the inner end of the third upper horizontal plate can be directly fixed to the lower end of the second outer drill rod 32; the outer end of the third upper horizontal plate 41121 can be fixed to the upper end of the third vertical plate 41123, the lower end of the third vertical plate 41123 can be fixed to the outer end of the second lower horizontal plate 41124, the inner end of the second lower horizontal plate 41124 can be fixed to the second lower connecting sleeve 41125, and the second lower connecting sleeve 41125 can be rotatably engaged with the lower end of the inner drill rod 34. Multiple third outer mixing blades 4111 are fixed on the third mixing frame 411 of the other mixing head 41 of the mixing pile. For example, one third outer mixing blade is fixed on each third frame 4112, for a total of three third outer mixing blades. Multiple third inner mixing blades 43 are fixed on the inner drill rod 34 located in the other mixing head 41 section of the mixing pile. For example, two third inner mixing blades 43, for a total of six, correspond to one third outer mixing blade 4111 on each frame. The third inner mixing blades 43 and the third outer mixing blades 4111 are staggered in height and stir each other. The third outer mixing blades 4111 can be transverse mixing blades, and the third inner mixing blades 43 can be transverse mixing blades. The other mixing head 41 of the mixing pile in this other embodiment can be called the third mixing head. The third mixing frame 411 is also used to mix and produce small-diameter mixing piles 73, but it does not have a frustum lower end.
[0064] The upper horizontal plate, vertical plate, inclined plate, and / or lower horizontal plate of the frame are fixed to each other. They can be fixed by welding adjacent plates at right angles, and the corners between the expanded head 71 and the frustum transition section 72, and between the frustum transition section 72 and the mixing pile 73 can be right angles. Alternatively, the frame can be formed by bending a long strip plate, with arc transitions between corners, and the corners between the hinged expanded head and the frustum transition section, and between the frustum transition section and the mixing pile can be arc angles. Alternatively, adjacent plates can be fixed by welding at right angles, but with a missing corner at the outer angle, and the corners between the expanded head and the frustum transition section, and between the frustum transition section and the mixing pile can be corners with an inner convex ring.
[0065] The fixing can be achieved by using multiple bolts or by welding.
[0066] In an embodiment of the present invention, a combined bidirectional mixing device for constructing mixing piles with enlarged heads is provided, wherein the power head 5 is connected to and driven by the wire rope of the winch mechanism 14 and is vertically slidably fitted on the tower 13 of the pile driver 1.
[0067] An embodiment of the combined bidirectional mixing device for constructing mixing piles with enlarged heads according to this utility model may further include a grouting pipe fixed inside the inner drill rod 34. The upper end of the grouting pipe may have a connector 63 for connecting to the grout inlet pipe. The grout inlet pipe is connected to a grout pump and a grout pool located on the ground. The lower end of the grouting pipe may be connected to a plurality of first grouting ports 61 located on the first lower connecting sleeve 31125 or to a plurality of second grouting ports 62 located on the drill bit cylinder 82 of the drill bit 8.
[0068] The specific structure of the power head 5 and the specific structure connecting the upper end of the inner drill rod 34 and the upper end of the first outer drill rod 22 to the power head 5 can be as follows: the inner drill rod motor 52 and the outer drill rod motor 56, each with its own gearbox, are vertically and parallelly fixed inside the power head housing 51. The inner drill rod drive gear 54, coaxially fixed on the output shaft of the inner drill rod gearbox 53, meshes horizontally with the inner drill rod driven gear 55, coaxially fixed on the upper end of the inner drill rod 34. The outer drill rod drive gear 58, coaxially fixed on the output shaft of the outer drill rod gearbox 57, meshes horizontally with the outer drill rod driven gear 59, coaxially fixed on the upper end of the first outer drill rod 22. Relatively speaking, the outer drill rod driven gear 59 and the outer drill rod drive gear 58 are at the bottom, and the inner drill rod driven gear 55 and the inner drill rod drive gear 54 are at the top.
[0069] When the piling machine 1 equipped with the combined bidirectional mixing device of this utility model for constructing mixing piles with enlarged heads is in operation, the winch of the hoisting mechanism 14 on the construction platform 12 is connected to the power head 5 via a steel wire rope. The hoisting mechanism drives the power head 5 up or down. When driving it up, the steel wire rope is loosened, and the power head 5, inner drill rod 34, first outer drill rod 22, first mixing head, second outer drill rod 32, and second or third mixing head descend by their own weight. The power head 5 drives the first and second or third mixing heads to mix bidirectionally, thus agitating the cement-soil mixture, while cement slurry is sprayed from the grouting nozzle simultaneously. After both the mixing pile 73 and the enlarged head 71 reach the predetermined depth, they are rotated and simultaneously lifted, first pulling out the first mixing head, then pulling out the second mixing head. After the cement slurry solidifies, or after the cement slurry-mixed soil solidifies, it becomes a mixing pile 73 with an enlarged head 71 and a frustum-shaped transition section 72. In layman's terms, the lower section of the enlarged head 71, the frustum-shaped transition section 72, and the upper section of the mixing pile 73, when viewed from the front, resemble a funnel shape. The piling machine 1 can be moved laterally and longitudinally to construct the mixing piles 73, each equipped with an enlarged head 71 and a frustum-shaped transition section 72, one pile at a time, thereby completing the soft soil foundation section by section. Figure 8 The soil shown in Figure 7 is reinforced to prevent settlement. Figure 8 It is convenient to display and takes up space Figure 8Due to the small area, the actual construction can be reversed, that is, the pile driver 1 can be placed on the outside of the soil 7 of the already constructed enlarged head 71, truncated cone transition section 72 and mixing pile 73.
[0070] It is easy to understand that the mixing pile 73 with the enlarged head 71 is also called the mixing pile 73 with the enlarged head 71. 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 operating room 15. The cylinder of the walking mechanism 11, the winch of the hoisting mechanism 14, the inner drill rod motor 52, the outer drill rod motor 56, etc. are all electrically connected to and driven by the control device, such as the main controller or computer. The power head housing 51 is also called the power head shell. The inner drill rod 34 and the outer drill rod, such as the first outer drill rod 22 and the second outer drill rod 32, are both made of steel pipe, and the grout delivery pipe can be made of plastic pipe. The reinforcement treatment for soft soil foundation anti-settlement is also called the solidification treatment for soft soil foundation anti-settlement. The vertical plate is also called the vertical plate. The mixing blade can be called a block or a piece, that is, the two terms block and piece are interchangeable. The frame 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 a transmission, reduction gearbox, or reducer. Coaxial fixing means coaxial axis fixing. The enlarged head 71 is also called the enlarged head of the mixing pile. The frustum transition section 72 is also called the frustum conical transition section, frustum-shaped transition section, frustum transition surface, or frustum-shaped transition surface. It is easy to understand that the frustum transition section 72 can be a smooth frustum transition section or a frustum stepped transition surface with multiple steps; of course, a smooth frustum transition surface is preferred. It is easy to understand that a smooth frustum transition section is composed of straight inclined plates, while a frustum stepped transition surface is composed of inclined stepped plates with multiple steps on the outer side.
[0071] 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.
[0072] 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: The combined bidirectional mixing device has two mixing heads: one is an enlarged head mixing head, and the other is a mixing pile mixing head. Multiple first outer stirring blades are fixed on the first stirring frame of the enlarged head's stirring head. The upper end of the first outer drill rod is connected to the power head, and the lower end of the first outer drill rod is connected to the first stirring frame. The second mixing frame of the mixing head of the mixing pile is fixed with multiple second outer mixing blades. The upper end of the second outer drill rod is connected to the first mixing frame, and the lower end of the second outer drill rod is connected to the second mixing frame. The second outer drill pipe is coaxial with the first outer drill pipe; The inner drill rod rotates within the first and second outer drill rods, and the upper end of the inner drill rod is connected to the power head. Multiple first inner stirring blades are fixed on the inner drill rod of the stirring head section of the enlarged head. The first inner stirring blades and the first outer stirring blades are staggered in height and stir each other in opposite directions. Multiple second inner mixing blades are fixed on the inner drill rod of the mixing head section of the mixing pile. The second inner mixing blades and the second outer mixing blades are staggered in height and mix with each other in opposite directions. The lower end of the inner drill rod is rotatably engaged with the lower connecting sleeve of the second mixing frame.
2. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: The first stirring frame of the enlarged stirring head consists of multiple first frame pages: the multiple first frame pages are distributed along the circumference, the inner end of the first upper horizontal plate of each first frame page is fixed to the lower 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 upper end of the first inclined plate, and the lower end of the first inclined plate is fixed to the upper end of the second outer drill rod.
3. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: Multiple second frame panels constitute the second mixing frame of a mixing head for the mixing pile: 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 lower 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 second inclined plate, the lower end of the second inclined plate is fixed to the first lower connecting sleeve, and the first lower connecting sleeve is rotatably engaged with the lower end of the inner drill rod.
4. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 1, characterized in that: The drill bit is fixed at the lower end of the inner drill rod.
5. The combined bidirectional mixing device for constructing mixing piles with enlarged heads according to claim 4, characterized in that: Multiple third frame panels constitute the third mixing frame of another mixing head of the mixing pile: the multiple frame panels are distributed along the circumference; the inner end of the third upper horizontal plate of each third frame panel is fixed to the lower end of the second outer drill rod, the outer end of the third upper horizontal plate is fixed to the upper end of the third vertical plate, the lower end of the third vertical plate is fixed to the outer end of the third lower horizontal plate, the inner end of the third lower horizontal plate is fixed to the second lower connecting sleeve, and the second lower connecting sleeve is rotatably engaged with the lower end of the second inner drill rod; multiple third outer mixing blades are fixed to the third mixing frame of the mixing head of the mixing pile, and multiple third inner mixing blades are fixed to the inner drill rod located in the mixing head section of the mixing pile. The third inner mixing blades and the third outer mixing blades are staggered in height and stir each other in opposite directions.