A bidirectional mixing device for improving the overall uniformity of pile body

Abstract

This utility model discloses a bidirectional mixing device for improving the overall uniformity of pile body, belonging to the field of pile foundation equipment. A power head drives the inner and outer drill rods to rotate in opposite directions. The lower ends of the inner and outer drill rods are connected to the inner and outer drill bits, respectively. A casing is coaxially mounted on the outer side of the outer drill rod, and two sets of large circulation structures are symmetrically arranged on the casing. Each large circulation structure includes: a transmission wheel between the casing and the power head, which drives a chain to rotate in a ring. A mixing plate is mounted on the chain, and ribs are welded to the casing and positioned between the chain rings. The blades of the inner drill bit are arranged in a sickle-shaped structure. This utility model, by setting up a large circulation structure, thoroughly mixes the entire pile, ensuring uniform overall pile strength. During radial mixing, the two layers of sickle-shaped blades on the inner drill bit create an inward and outward stirring effect, promoting thorough mixing of the solidified slurry within the radial range.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation equipment, and in particular to a bidirectional mixing device for improving the overall uniformity of the pile body. Background Technology

[0002] Soft soil refers to fine-grained soil naturally deposited in coastal areas, lakes, valleys, and riverbanks, characterized by high water content, large void ratio, high compressibility, and low shear strength. The construction of more and more highways, railways, and ports inevitably passes through soft soil foundation areas, and strengthening the foundation with cement-soil mixing piles is a common improvement measure. Two-way mixing piles utilize cement / hardener as the solidification material. Through specialized mixing machinery and grouting pumps, the soft soil and solidification material are forcibly mixed deep within the foundation. A series of physicochemical reactions between the solidification material and the soft soil cause the soft soil to harden into a composite foundation with integrity, water stability, and high bearing capacity.

[0003] Currently, the two major problems in bidirectional mixing construction are uneven mixing of the sprayed medium (cement slurry or powder) with the soil layer; and significant differences in geological parameters between different strata, leading to inconsistent pile quality at different depths when using the same curing material for reinforcement. Existing bidirectional mixing technologies often have spray nozzles located on the surface of the inner drill rod, which can cause slurry to accumulate and fill gaps, resulting in uneven pile strength after hardening, sometimes even with the pile center strength being significantly higher than the pile edge strength.

[0004] Therefore, it is essential to fundamentally improve the design of existing mixing equipment; otherwise, the applicability of the bidirectional mixing process will inevitably be limited. Based on this, the present invention proposes a bidirectional mixing device to improve the overall uniformity of the pile body. Summary of the Invention

[0005] To address the aforementioned technical problems in existing technologies, this utility model proposes a bidirectional mixing device to improve the overall uniformity of pile bodies, overcoming the shortcomings of existing technologies. When mixing piles cross different soil layers, the mixing effect is inconsistent; even after being uniformly mixed within the same stratum, the mixture cannot migrate longitudinally, meaning the upper and lower layers of solidified soil cannot be fully mixed to form a homogeneous material. By setting up a large circulation structure, the entire pile is thoroughly mixed uniformly, ensuring the overall strength of the pile body is uniform. During radial mixing, two layers of sickle-shaped blades on the inner drill bit create an inward and outward lifting effect, promoting thorough mixing of the solidified slurry within the radial range.

[0006] A bidirectional mixing device for improving the overall uniformity of pile body includes a power head, an inner drill rod, an outer drill rod, a casing, a drive wheel, a chain, ribs, an inner drill bit, and an outer drill bit. The power head drives the inner and outer drill rods to rotate in opposite directions. The lower ends of the inner and outer drill rods are connected to the inner and outer drill bits, respectively. A casing is coaxially arranged on the outer side of the outer drill rod, and two sets of large circulation structures are symmetrically arranged on the casing. The large circulation structure includes: a drive wheel between the casing and the power head, which drives the chain to rotate in a ring. A mixing plate is arranged on the chain, and ribs are welded to the casing and located between the rings of the chain. The blades of the inner drill bit are arranged in a sickle shape.

[0007] Preferably, the power head structure includes a motor, an inner drill rod drive shaft, an inner drill rod gear, an outer drill rod drive shaft, an outer drill rod gear, a slurry pipe, and a large circulation structure drive motor. The motor drives the inner and outer drill rod drive shafts to rotate. The inner drill rod drive shaft meshes with the inner drill rod gear for transmission, and the outer drill rod drive shaft meshes with the outer drill rod gear for transmission. The slurry pipe is externally connected to a faucet structure and internally connected to the inner drill rod, transferring slurry to the inner drill bit and ejecting it.

[0008] Preferably, the transmission wheel is fixed by a transmission shaft, one end of which is connected to the large circulation structure drive motor, and the other end is connected to the sleeve through a bearing.

[0009] Preferably, the inner drill pipe, outer drill pipe, and casing are all arranged coaxially, with the casing located outside the outer drill pipe. The casing and the outer drill pipe are sealed by a sealing sleeve. The channel between the casing and the outer drill pipe serves as a high-pressure gas channel, and a gas nozzle is installed on the casing. Whether to add gas is determined according to the construction situation.

[0010] Preferably, the length of the rib is the clearance height between the two drive wheels, the outermost edge of the rib is the same as the outermost edge of the outer drill bit, and the rib has holes along its length. The spacing of the holes can be selected according to different project requirements.

[0011] Preferably, the internal drill bit is provided with at least two layers of blades, both of which are sickle-shaped structures, but the two layers of blades are bent in opposite directions.

[0012] The beneficial technical effects of this utility model are as follows:

[0013] When mixing piles cross different soil layers, the mixing effect is inconsistent. Once the soil in the same stratum is mixed evenly, it cannot migrate longitudinally, meaning that the solidified soil in the upper and lower layers cannot be fully mixed to form a homogeneous material. By setting up a large circulation structure, the entire pile is fully mixed and uniform, ensuring the overall strength of the pile body is uniform. During radial mixing, the two layers of sickle-shaped blades on the inner drill bit create an inward and outward lifting effect, promoting the full mixing of the solidified grout within the radial range. Attached Figure Description

[0014] Figure 1This is a cross-sectional schematic diagram of a bidirectional mixing device for improving the overall uniformity of a pile body according to the present invention.

[0015] Figure 2 This is a side view of a bidirectional mixing device for improving the overall uniformity of a pile body, according to the present invention.

[0016] Figure 3 This is a schematic diagram of the internal drill bit structure in a bidirectional mixing device for improving the overall uniformity of a pile body, according to this utility model.

[0017] Figure 4 This is a schematic diagram of the circulation of solidified slurry on opposite sides during the use of a bidirectional mixing device for improving the overall uniformity of the pile body, according to this utility model.

[0018] Figure 5 This is a schematic diagram showing the same-side circulation of solidified slurry during the use of a bidirectional mixing device for improving the overall uniformity of the pile body, according to this utility model.

[0019] Among them, 1-power head, 2-inner drill rod, 3-outer drill rod, 4-casing, 5-transmission wheel, 6-chain, 7-rib plate, 8-inner drill bit, 9-outer drill bit, 11-motor, 12-inner drill rod drive shaft, 13-inner drill rod gear, 14-outer drill rod drive shaft, 15-outer drill rod gear, 16-grout pipe, 17-large circulation structure drive motor. Detailed Implementation

[0020] Example

[0021] like Figures 1-5 As shown, a bidirectional mixing device for improving the overall uniformity of pile body includes a power head 1, an inner drill rod 2, an outer drill rod 3, a casing 3, a transmission wheel 5, a chain 6, a rib plate 7, an inner drill bit 8, and an outer drill bit 9. The power head 1 drives the inner drill rod 2 and the outer drill rod 3 to rotate in opposite directions. The lower ends of the inner drill rod 2 and the outer drill rod 3 are connected to the inner drill bit 8 and the outer drill bit 9, respectively. The casing 3 is coaxially arranged on the outer side of the outer drill rod 3, and two sets of large circulation structures are symmetrically arranged on the casing 3. The large circulation structure includes: a transmission wheel 5 arranged between the casing 3 and the power head 1, the transmission wheel 5 driving the chain 6 to rotate in a ring, a mixing plate arranged on the chain 6, and rib plates 7 welded to the casing 3 and located between the rings of the chain 6; the blades of the inner drill bit 8 are arranged in a sickle-shaped structure.

[0022] Preferably, the power head 1 structure includes a motor 11, an inner drill rod drive shaft 12, an inner drill rod gear 13, an outer drill rod drive shaft 14, an outer drill rod gear 15, a slurry pipe 16, and a large circulation structure drive motor 17. The motor 11 drives the inner drill rod drive shaft 12 and the outer drill rod drive shaft 14 to rotate. The inner drill rod drive shaft 12 meshes with the inner drill rod gear 13 for transmission, and the outer drill rod drive shaft 14 meshes with the outer drill rod gear 15 for transmission. The slurry pipe 16 is externally connected to a faucet structure and internally connected to the inner drill rod 2, transferring slurry to the inner drill bit 8 and ejecting it.

[0023] Preferably, the transmission wheel 5 is fixed by a transmission shaft, one end of which is connected to the large circulation structure drive motor 17, and the other end is connected to the sleeve 3 by a bearing.

[0024] Preferably, the inner drill rod 2, the outer drill rod 3, and the casing 3 are all arranged coaxially, with the casing 3 located outside the outer drill rod 3. The casing 3 and the outer drill rod 3 are sealed by a sealing sleeve. The channel between the casing 3 and the outer drill rod 3 serves as a high-pressure gas channel, and a gas nozzle is installed on the casing 3 to determine whether to add gas based on the construction situation.

[0025] Preferably, the length of the rib plate 7 is the clearance height between the two drive wheels 5, the outermost edge of the rib plate 7 is the same as the outermost edge of the outer drill bit 9, and the rib plate 7 is provided with holes along its length direction. The holes with different spacing can be selected to open according to different project requirements.

[0026] Preferably, the inner drill bit 8 has at least two layers of blades, both of which are sickle-shaped, but the two layers of blades are bent in opposite directions. Example

[0027] like Figures 1-5 As shown, a bidirectional mixing device for improving the overall uniformity of pile body includes a power head 1, an inner drill rod 2, an outer drill rod 3, a casing 3, a transmission wheel 5, a chain 6, a rib plate 7, an inner drill bit 8, and an outer drill bit 9. The power head 1 drives the inner drill rod 2 and the outer drill rod 3 to rotate in opposite directions. The lower ends of the inner drill rod 2 and the outer drill rod 3 are connected to the inner drill bit 8 and the outer drill bit 9, respectively. The casing 3 is coaxially arranged on the outer side of the outer drill rod 3, and two sets of large circulation structures are symmetrically arranged on the casing 3. The large circulation structure includes: a transmission wheel 5 arranged between the casing 3 and the power head 1, the transmission wheel 5 driving the chain 6 to rotate in a ring, a mixing plate arranged on the chain 6, and rib plates 7 welded to the casing 3 and located between the rings of the chain 6; the blades of the inner drill bit 8 are arranged in a sickle-shaped structure. When mixing piles cross different soil layers, the mixing effect is inconsistent. Once the same stratum is mixed evenly, it cannot migrate longitudinally, meaning that the upper and lower solidified soil layers cannot be fully mixed to form a homogeneous material. By setting up a large circulation structure, the entire pile is fully mixed and uniform, ensuring the overall strength of the pile body is uniform. During radial mixing, the two layers of sickle-shaped blades on the inner drill bit 8 create an inward and outward lifting effect, promoting the full mixing of the solidified grout within the radial range.

[0028] Preferably, the power head 1 structure includes a motor 11, an inner drill rod drive shaft 12, an inner drill rod gear 13, an outer drill rod drive shaft 14, an outer drill rod gear 15, a slurry pipe 16, and a large circulation structure drive motor 17. The motor 11 drives the inner drill rod drive shaft 12 and the outer drill rod drive shaft 14 to rotate. The inner drill rod drive shaft 12 meshes with the inner drill rod gear 13 for transmission, and the outer drill rod drive shaft 14 meshes with the outer drill rod gear 15 for transmission. The slurry pipe 16 is externally connected to a faucet structure and internally connected to the inner drill rod 2, transferring slurry to the inner drill bit 8 and ejecting it.

[0029] Preferably, the transmission wheel 5 is fixed by a transmission shaft, one end of which is connected to the large circulation structure drive motor 17, and the other end is connected to the sleeve 3 by a bearing.

[0030] Preferably, the inner drill rod 2, outer drill rod 3, and casing 3 are all arranged coaxially, with the casing 3 located outside the outer drill rod 3. The casing 3 and the outer drill rod 3 are sealed together by a sealing sleeve. The channel between the casing 3 and the outer drill rod 3 serves as a high-pressure gas channel, and a gas nozzle is installed on the casing 3. Whether to add gas is determined according to the construction situation. By adding gas, the solidified slurry is further mixed by using gas lifting.

[0031] Preferably, the length of the rib plate 7 is the clearance height between the two drive wheels 5, and the outermost edge of the rib plate 7 is the same as the outermost edge of the outer drill bit 9. The two rib plates 7 divide the pile body into two parts, and the longitudinal movement of the chain 6 causes the solidified grout to migrate longitudinally. When the two chains 6 rotate in the same direction, the solidified grout in one space separated by the rib plate 7 migrates upward, while the solidified grout in the other space migrates downward, thus forming a large circulation of the entire pile. The rib plate 7 has holes along its length. The spacing of the holes can be selected according to different project requirements. The holes on the rib plate 7 are set to change the circulation depth. For example, if the entire pile crosses few strata, mainly two strata, then the hole spacing can be set larger. When the two chains 6 rotate in opposite directions, the solidified grout in the two spaces separated by the rib plate 7 migrates half upward and half downward, thus forming a large circulation of half the pile.

[0032] Preferably, the inner drill bit 8 has at least two layers of blades, both of which are sickle-shaped, but the two layers of blades bend in opposite directions. The different bending directions of the two layers of blades mean that the inward turning and outward turning do not occur in the same layer. This allows for radial migration and stirring, followed by further migration, resulting in a better mixing effect.

[0033] In the description of the embodiments of this utility model, it should be understood that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.

[0034] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model are also within the protection scope of the present utility model.

Claims

1. A bidirectional mixing apparatus for improving the uniformity of a pile body, characterized by, It includes a power head, inner drill rod, outer drill rod, casing, drive wheel, chain, rib plate, inner drill bit, and outer drill bit. The power head drives the inner and outer drill rods to rotate in opposite directions. The lower ends of the inner and outer drill rods are connected to the inner and outer drill bits, respectively. A casing is coaxially mounted on the outer side of the outer drill rod. Two sets of large circulation structures are symmetrically arranged on the casing. The large circulation structure includes: a drive wheel between the casing and the power head, which drives the chain to rotate in a ring. A stirring plate is mounted on the chain. Ribs are welded to the casing and positioned between the chain rings. The blades of the inner drill bit are designed in a sickle shape.

2. The bidirectional mixing apparatus for improving the uniformity of the whole pile body according to claim 1, characterized in that, The power head structure includes a motor, an inner drill rod drive shaft, an inner drill rod gear, an outer drill rod drive shaft, an outer drill rod gear, a slurry pipe, and a large circulation structure. The motor drives the inner and outer drill rod drive shafts to rotate. The inner drill rod drive shaft meshes with the inner drill rod gear for transmission, and the outer drill rod drive shaft meshes with the outer drill rod gear for transmission. The slurry pipe is externally connected to the faucet structure and internally connected to the inner drill rod, transferring the slurry to the inner drill bit and ejecting it.

3. The bidirectional mixing apparatus for improving the uniformity of the whole pile body according to claim 1, characterized in that, The drive wheel is fixed by a drive shaft. One end of the drive shaft is connected to the drive motor of the large circulation structure, and the other end is connected to the sleeve through a bearing.

4. The bidirectional mixing apparatus for improving the uniformity of the whole pile body according to claim 1, characterized in that, The inner drill pipe, outer drill pipe, and casing are all arranged coaxially. The casing is located outside the outer drill pipe, and the casing and the outer drill pipe are sealed by a sealing sleeve. The channel between the casing and the outer drill pipe serves as a high-pressure gas channel, and a gas nozzle is installed on the casing. Whether to add gas depends on the construction situation.

5. The bidirectional mixing apparatus for improving the uniformity of the whole pile body according to claim 1, characterized in that, The length of the rib plate is the clearance height between the two drive wheels. The outermost edge of the rib plate is the same as the outermost edge of the outer drill bit. Holes are provided along the length of the rib plate, and different spacing holes are selected to be opened according to different project requirements.

6. The bidirectional mixing apparatus for improving the uniformity of the whole pile body according to claim 1, characterized in that, The internal drill bit has at least two layers of blades, both of which are sickle-shaped, but the two layers of blades are bent in opposite directions.

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