A planetary bidirectional mixing head for cement mixing pile construction

Abstract

The utility model discloses a planetary bidirectional stirring head for cement mixing pile construction, including hollow outer pole, the hollow inner pole is nested in the outer pole, the bottom fixed docking of outer pole is on the casing of gear box, and the inner pole inserts gear box inside and is fixed docking with the vertical main shaft of gear box, and the vertical main shaft is as the stirring main shaft, and is the hollow shaft of closed cone shape for the end, and the inner tube is coaxial fixed docking with the vertical main shaft top and the inner chamber is through, and the vertical main shaft is vertically provided with straight plate blade and the grouting pipe that communicates with the inner chamber of vertical main shaft, and the vertical main shaft has the auxiliary shaft through gear box switching, and the auxiliary shaft is as the auxiliary stirring axle, and is equipped with the auxiliary stirring blade on the auxiliary stirring axle. This stirring head can realize bidirectional stirring, and the structural form that the main stirring axle is combined with the auxiliary stirring axle has stronger stirring capacity and anti -bore -drill characteristic, especially when handling high water content silt, high plastic clay, contains thin sand interlayer or organic matter soil and so on complex stratum, has obvious advantage, and the quality of more guarantee is formed in a pile.

Description

Technical Field

[0001] This utility model relates to the technical field of cement mixing pile construction equipment, and in particular to a planetary bidirectional mixing head for cement mixing pile construction. Background Technology

[0002] Cement mixing piles (such as deep mixing piles and jet grouting piles) are a commonly used technology for reinforcing soft soil foundations and for preventing seepage and stopping water. Unidirectional mixing pile machines are commonly used in the market. The core component for achieving pile formation (consolidation) is the mixing drill bit on the drill rod. During construction, the drill bit rotates in one direction (usually clockwise) to cut and break up the in-situ soil until it sinks to the designed depth. Simultaneously, cement slurry (wet method) or cement powder (dry method) is continuously sprayed through the center or side channels of the drill rod. The blades on the drill bit forcefully mix the cement curing agent with the soil to form a uniform, continuous cement-soil pile with a certain strength.

[0003] Although unidirectional mixing technology is widely used and mature, rotation in one direction can cause soil and cement slurry (cement powder) to form obvious "laminar flow" or "vortex" effects in the mixing area. Soil and cement-based solidifying agents tend to move along the tangent of the blade rotation, failing to achieve sufficient radial and axial three-dimensional cross mixing. This results in the pile body easily forming a "layer cake" structure with uneven strength in the vertical direction, with weak bonding between layers. Within the pile diameter range, the cement slurry (cement powder) will also be unevenly distributed, with the central area potentially rich and the edge area insufficient, resulting in large dispersion in pile quality. In addition, the unidirectional rotating blades have a single rotational cutting action, which is difficult to fully cut and break up soil clumps in complex strata such as cohesive soil and organic soil. It often easily squeezes cohesive soil into clumps and wraps them between the blades or around the drill rod, forming "mud cakes" or "mud bags," which seriously hinder the rotation and lifting of the drill bit, i.e., the "drill sticking" phenomenon. To overcome the problems of uneven mixing and "drill sticking", the unidirectional mixing process often requires measures such as "secondary mixing" (i.e., sinking and mixing once, then lifting, and sinking and mixing again) or "re-mixing", which significantly increases the construction time per unit pile length, reduces construction efficiency, and increases costs. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model proposes a planetary bidirectional mixing head for cement mixing pile construction. This planetary bidirectional mixing head can achieve bidirectional mixing. Through the combination of the main mixing shaft and the auxiliary mixing shaft, it has stronger mixing capacity and anti-drilling characteristics. It has significant advantages, especially when dealing with complex strata such as high water content silt, high plastic clay, thin sand interlayers, or organic soil, and the quality of pile formation is more guaranteed.

[0005] A planetary bidirectional mixing head for cement mixing pile construction includes a hollow outer rod with a hollow inner rod nested inside. The bottom of the outer rod is fixedly connected to the housing of a gearbox. The inner rod is inserted into the gearbox and fixedly connected to the vertical main shaft of the gearbox. The vertical main shaft, serving as the mixing main shaft, is a hollow shaft with a closed conical end. The inner rod is coaxially fixedly connected to the top of the vertical main shaft and has a through cavity. The vertical main shaft is vertically provided with straight blades and a grouting pipe communicating with the inner cavity of the vertical main shaft. The vertical main shaft is connected to a secondary shaft via the gearbox. The secondary shaft serves as a secondary mixing shaft and is provided with secondary mixing blades.

[0006] As a preferred embodiment of the above technical solution, the gearbox is a reversing gearbox, which includes a vertical main shaft and two transverse secondary shafts symmetrically arranged relative to the vertical main shaft. The transverse secondary shafts are secondary stirring shafts, and the vertical main shaft and the transverse secondary shafts are driven by a gear set inside the reversing gearbox.

[0007] As a preferred embodiment of the above technical solution, the gearbox is a transmission gearbox, which includes a vertical main shaft and two vertical secondary shafts parallel to both sides of the vertical main shaft. The vertical secondary shafts are secondary stirring shafts, and the vertical main shaft and the vertical secondary shafts are driven by a gear set inside the transmission gearbox.

[0008] As a preferred embodiment of the above technical solution, the top of the vertical sub-shaft is positioned by a gearbox, and the bottom is connected to a positioning plate, with the middle of the positioning plate being limited by the vertical main shaft.

[0009] As a preferred embodiment of the above technical solution, the straight blades are provided in multiple sets, and the cross-section of the straight blades is set at a certain angle to the cross-section of the vertical main shaft.

[0010] As a preferred embodiment of the above technical solution, the straight blades are provided in multiple groups, and each group of straight blades includes two straight blades arranged opposite to each other, and the two straight blades in the same group have the same angle with the cross section of the vertical main shaft and opposite inclination.

[0011] As a preferred embodiment of the above technical solution, the two adjacent sets of straight blades are arranged in a cross shape.

[0012] As a preferred embodiment of the above technical solution, the auxiliary stirring blades are provided in multiple sets, each set of the auxiliary stirring blades including two auxiliary stirring blades arranged opposite each other. The auxiliary stirring blades are L-shaped, and the plane of the connection section between the auxiliary stirring blade and the auxiliary stirring shaft coincides with the cross-section of the auxiliary stirring shaft.

[0013] As a preferred embodiment of the above technical solution, the adjacent sets of auxiliary stirring blades are arranged in a cross shape.

[0014] As a preferred embodiment of the above technical solution, the grouting pipe is disposed close to the upper surface of the last straight blade on the vertical main shaft, and the length of the grouting pipe is less than the length of the straight blade.

[0015] The beneficial effects of this utility model are as follows:

[0016] Compared to unidirectional mixing, this planetary bidirectional mixing head enables bidirectional mixing. Its structure, combining a main mixing shaft and a secondary mixing shaft, provides stronger mixing capabilities and anti-drill-clamping characteristics, resulting in smoother drill rod descent and lifting, and higher construction efficiency. The bidirectional shearing motion effectively replaces and compacts the soil, leading to more regular piles with less diameter fluctuation and better verticality, reducing irregularities such as "string of candied hawthorns" or localized necking and widening. It is particularly advantageous when dealing with complex strata such as high-water-content silt, high-plasticity clay, thin sand interlayers, or organic soils, ensuring higher pile quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1.

[0018] Figure 2 This is the front view of Embodiment 1.

[0019] Figure 3 This is a side view of Embodiment 1.

[0020] Figure 4 This is a schematic diagram of the structure of Example 2.

[0021] The attached diagram is labeled as follows: 1-Outer rod, 2-Inner rod, 3-Gearbox, 4-Vertical main shaft, 5-Straight blade, 6-Grouting pipe, 7-Secondary shaft, 8-Secondary mixing blade, 9-Positioning plate. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Example 1

[0024] like Figure 1The diagram shows a planetary bidirectional mixing head for cement mixing pile construction, comprising a hollow outer rod 1, inside which a hollow inner rod 2 is nested. The bottom of the outer rod 1 is fixedly connected to the housing of a gearbox 3. The inner rod 2 is inserted into the gearbox 3 and fixedly connected to the vertical main shaft 4 of the gearbox 3. The vertical main shaft 4 serves as the mixing main shaft and is a hollow shaft with a closed conical end. The inner rod 2 is coaxially fixedly connected to the top of the vertical main shaft 4 and its inner cavity is open. The vertical main shaft 4 is vertically provided with straight blades 5 and a grouting pipe 6 communicating with the inner cavity of the vertical main shaft 4. The vertical main shaft 4 is connected to a secondary shaft 7 via the gearbox 3. The secondary shaft 7 serves as a secondary mixing shaft and is provided with secondary mixing blades 8.

[0025] In this embodiment, the gearbox 3 is a reversing gearbox, which includes a vertical main shaft 4 and two transverse secondary shafts 7 symmetrically arranged relative to the vertical main shaft 4. The transverse secondary shafts 7 are secondary stirring shafts, and the vertical main shaft 4 and the transverse secondary shafts 7 are driven by a gear set inside the reversing gearbox.

[0026] In this embodiment, the straight blade 5 is provided in multiple sets, and the straight blade 5 is set at a certain angle to the cross section of the vertical main shaft 4.

[0027] In this embodiment, the straight blades 5 are provided in multiple groups, and each group of straight blades 5 includes two straight blades 5 arranged opposite each other. The two straight blades 5 in the same group have equal angles with the cross-section of the vertical main shaft 4 and opposite inclinations. Figure 2 As shown.

[0028] In this embodiment, the two adjacent sets of straight blades 5 are arranged in a cross shape.

[0029] In this embodiment, the auxiliary stirring blades 8 are provided in multiple sets, and each set of auxiliary stirring blades 8 includes two auxiliary stirring blades 8 arranged opposite each other. The auxiliary stirring blades 8 are L-shaped, and the plane on the auxiliary stirring blade 8 where the connection section with the auxiliary stirring shaft is located coincides with the cross-section of the auxiliary stirring shaft.

[0030] In this embodiment, adjacent sets of auxiliary stirring blades 8 are arranged in a cross shape, such as... Figure 3 As shown.

[0031] In this embodiment, the grouting pipe 6 is disposed close to the upper surface of the last straight blade 5 on the vertical main shaft 4, and the length of the grouting pipe 6 is less than the length of the straight blade 5.

[0032] Example 2

[0033] The difference between this embodiment and Embodiment 1 is that:

[0034] In this embodiment, the gearbox 3 is a transmission gearbox, which includes a vertical main shaft 4 and two vertical secondary shafts 7 parallel to both sides of the vertical main shaft 4. The vertical secondary shafts 7 are secondary stirring shafts, and the vertical main shaft 4 and the vertical secondary shafts 7 are driven by a gear set inside the transmission gearbox.

[0035] In this embodiment, the top of the vertical sub-shaft is positioned by the gearbox 3, and the bottom is connected to a positioning plate 9. The middle of the positioning plate 9 is limited by the vertical main shaft 4. Figure 4 As shown.

[0036] The reversing gearbox and transmission gearbox used in Embodiment 1 and Embodiment 2 are both existing technologies, and their structure and working principle will not be further described here.

[0037] The planetary bidirectional mixing head is installed on the bidirectional cement mixing pile machine. The bidirectional cement mixing pile machine has two concentrically nested drill rods, namely the outer drill rod and the inner drill rod. The outer drill rod is a round pipe with a larger diameter, and its end is connected to the outer rod 1 of the planetary bidirectional mixing head. The inner drill rod is a round pipe with a relatively smaller diameter, which is concentrically nested inside the outer drill rod. The inner cavity of the inner drill rod contains the grouting main pipe. The inner drill rod is connected to the inner rod 2 of the bidirectional mixing head. The grouting main pipe is connected to the cavity of the inner rod 2, and then connected to the grouting pipe 6 fixed on the straight blade 5, forming a channel for injecting cement slurry (or cement powder) into the soil. The outer and inner drill pipes can rotate simultaneously in both directions, driving the inner rod 2 and outer rod 1 of the planetary bidirectional stirring head installed at the end of the drill pipe to rotate in both directions. This, in turn, drives the straight blades 5 and gearbox 3 on the planetary bidirectional stirring head installed at the end of the drill pipe to rotate in both directions. The auxiliary stirring blades 8 are distributed on the auxiliary stirring shaft. When the gearbox 3 rotates, the auxiliary stirring shaft and auxiliary stirring blades 8 also rotate around the axis centered on the inner rod 2, just like planets revolving around the sun. The gearbox 3 has a reversible transmission function. When the vertical main shaft 4 of the gearbox 3 rotates together with the inner rod 2, the auxiliary stirring shaft of the gearbox 3 will also rotate, thereby driving the auxiliary stirring shaft and auxiliary stirring blades 8 to rotate in both directions. The rotation around the auxiliary mixing shaft occurs, much like the rotation of a planet. The bidirectional rotation of the straight blades 5 and gearbox 3 on the planetary bidirectional mixing head, as well as the auxiliary mixing shaft and auxiliary mixing blades 8 fixed thereon, around the inner rod 2 is called revolution. The rotation of the auxiliary mixing shaft and auxiliary mixing blades 8 around the auxiliary mixing shaft is called rotation. The revolution and rotation occur simultaneously, much like the motion of a planet in the solar system. While each mixing component of the planetary bidirectional mixing head is performing "planetary motion", the grouting pipe 6 sprays out cement slurry (or cement powder). The straight blades 5, auxiliary mixing shaft, and auxiliary mixing blades 8 on the planetary bidirectional mixing head rotate in multiple directions to cut and mix the soil.

[0038] The multi-directional rotating straight blades 5, the auxiliary mixing shaft, and the auxiliary mixing blades 8 create a "kneading," "tearing," and "turning" effect on the soil, more effectively breaking down the soil's granular structure and stratification. This allows the cement slurry (or cement powder) to be mixed more fully and evenly with the soil in both horizontal and vertical directions, resulting in a more complete hydration reaction. This significantly reduces the occurrence of mixing blind zones and inhomogeneous materials (such as soil clumps and cement blocks), reduces local enrichment of cement slurry (or cement powder) or insufficient contact with the soil, improves cement utilization, and ensures that the cement-soil pile body is more uniform in material composition and physical and mechanical properties (strength, modulus) along the pile length and diameter. It also reduces weak points and defects, making the pile body a more integrated composite foundation reinforcement or seepage prevention curtain.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A planetary bidirectional mixing head for cement mixing pile construction, characterized in that: The device includes a hollow outer rod, within which a hollow inner rod is nested. The bottom of the outer rod is fixedly connected to the housing of a gearbox. The inner rod is inserted into the gearbox and fixedly connected to the vertical main shaft of the gearbox. The vertical main shaft serves as a stirring main shaft and is a hollow shaft with a closed conical end. The inner rod is coaxially fixedly connected to the top of the vertical main shaft and its inner cavity is open. The vertical main shaft is vertically provided with straight blades and a grouting pipe communicating with the inner cavity of the vertical main shaft. The vertical main shaft is connected to a secondary shaft via the gearbox. The secondary shaft serves as a secondary stirring shaft and is provided with secondary stirring blades.

2. The planetary bidirectional mixing head for cement mixing pile construction according to claim 1, characterized in that: The gearbox is a reversible gearbox, which includes a vertical main shaft and two transverse secondary shafts symmetrically arranged relative to the vertical main shaft. The transverse secondary shafts are secondary stirring shafts. The vertical main shaft and the transverse secondary shafts are driven by a gear set inside the reversible gearbox.

3. The planetary bidirectional mixing head for cement mixing pile construction according to claim 1, characterized in that: The gearbox is a transmission gearbox, which includes a vertical main shaft and two vertical secondary shafts parallel to both sides of the vertical main shaft. The vertical secondary shafts are secondary stirring shafts. The vertical main shaft and the vertical secondary shafts are driven by a gear set inside the transmission gearbox.

4. A planetary bidirectional mixing head for cement mixing pile construction according to claim 3, characterized in that: The top of the vertical sub-shaft is positioned by a gearbox, and the bottom is connected to a positioning plate. The middle of the positioning plate is limited by the vertical main shaft.

5. A planetary bidirectional mixing head for cement mixing pile construction according to claim 1, characterized in that: The straight blades are provided in multiple sets, and the straight blades are set at a certain angle to the cross-section of the vertical main shaft.

6. A planetary bidirectional mixing head for cement mixing pile construction according to claim 5, characterized in that: The straight blades are provided in multiple groups. Each group of straight blades includes two straight blades arranged opposite each other. The two straight blades in the same group have the same angle with the cross section of the vertical main shaft and are inclined in opposite directions.

7. A planetary bidirectional mixing head for cement mixing pile construction according to claim 6, characterized in that: The adjacent groups of straight blades are arranged in a cross shape.

8. A planetary bidirectional mixing head for cement mixing pile construction according to claim 1, characterized in that: The auxiliary stirring blades are provided in multiple sets, and each set of auxiliary stirring blades includes two auxiliary stirring blades arranged opposite each other. The auxiliary stirring blades are L-shaped, and the plane where the connection section of the auxiliary stirring blade is located coincides with the cross-section of the auxiliary stirring shaft.

9. A planetary bidirectional mixing head for cement mixing pile construction according to claim 8, characterized in that: The adjacent sets of auxiliary stirring blades are arranged in a cross shape.

10. A planetary bidirectional mixing head for cement mixing pile construction according to claim 1, characterized in that: The grouting pipe is positioned close to the upper surface of the last straight blade on the vertical main shaft, and the length of the grouting pipe is less than the length of the straight blade.

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