Multi-power-head multi-layer mutual shearing mixing pile machine and using method thereof

Abstract

The invention discloses a multi-power-head multi-layer mutual-shearing mixing pile machine and a using method thereof.The multi-power-head multi-layer mutual-shearing mixing pile machine comprises a chassis, a drilling machine platform, a drilling tower, a sliding rail, a sliding frame, a power head assembly, a drill rod assembly and a drilling tool assembly, the power head assembly comprises power heads and power head connecting holes, and the drill rod assembly comprises an inner drill rod, an outer drill rod and a slurry conveying channel; the drilling tool assembly comprises an inner rod stirring wing, an outer rod stirring wing and a discharging channel opening, the inner rod stirring wing is fixed to the inner drilling rod and rotates along with rotation of the inner drilling rod, the outer rod stirring wing is fixed to the outer drilling rod and rotates along with rotation of the outer drilling rod, and the outer rod stirring wing and the inner rod stirring wing do not interfere with each other during rotation; the fixed position of a power head on the power head assembly can be changed on the sliding frame, so that the construction pile distance is changed, the construction efficiency is improved while the pile forming quality of the stirring pile is greatly improved, the requirements for various pile diameters and intervals are met, equipment investment optimization and equipment utilization maximization are achieved, and cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of underground construction machinery and equipment, and in particular to a multi-power head multi-layer mutual shearing mixing pile driver and a use method thereof. Background Art

[0002] In soft soil foundation treatment projects, mixing pile technology is widely used due to its high efficiency, economy and environmental protection. Traditional mixing pile machines usually use a single-layer drill rod structure for one-way mixing. The drill rod drives the mixing blade to rotate, and at the same time, a curing agent slurry is injected to mix the soil and slurry to form a pile body. After verification in domestic and foreign markets, the two-way mixing pile technology can significantly improve the strength and uniformity of the mixing piles compared with the one-way mixing piles, especially the pile body quality of the multi-layer shearing mixing piles has been significantly improved. However, the amount of soft soil foundation treatment is generally huge. For example, in the soft foundation reinforcement project of a highway, the full reinforcement work of several kilometers or even dozens of kilometers requires a large amount of equipment. In order to further improve the construction efficiency of the multi-layer shearing mixing piles and further reduce the cost of the process, it is very necessary to develop a process that can simultaneously inject two single mixing piles that do not affect each other.

[0003] Whether for the same project or different projects, the distance between piles may vary due to different design requirements and geological conditions. If equipment with fixed spacing is used, different mixing equipment needs to be replaced, which also increases construction costs. Even if only the power head and drilling system are replaced, it will also consume a lot of time and manpower.

[0004] Therefore, a multi-power head multi-layer mutual shearing mixing pile driver and a method of using the same are now proposed to solve the above problems. Summary of the Invention

[0005] The present invention overcomes the shortcomings of the existing technology and provides a multi-power head multi-layer mutual shearing mixing pile machine and its use method. On the basis of realizing multi-layer mutual shearing of deep soil to ensure the quality of the mixing pile body, the two power head components are placed on a positioning plate with adjustable spacing, and the single pile spacing can be flexibly adjusted according to different design requirements.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a multi-power head multi-layer mutual shear mixing pile driver, comprising: a chassis, a drilling rig platform, a drilling tower, a slide rail, a slide, a power head assembly, a drill rod assembly, and a drilling tool assembly; The drilling rig platform is installed on the chassis; The slide rail is fixed on the drilling tower; The slide includes a positioning plate and a claw, the positioning plate is provided with a plurality of positioning holes, and the claw can slide along the extension direction of the slide rail; The power head assembly includes a power head and a power head connecting hole, there are at least two power heads, and the power head connecting hole can be locked with the positioning hole; The drill rod assembly includes an inner drill rod, an outer drill rod, and a slurry delivery channel. There are one or more slurry delivery channels, and at least one of the slurry delivery channels is located inside the drill rod assembly. The drill tool assembly includes an inner rod stirring wing, an outer rod stirring wing, and a discharge channel. The inner rod stirring wing is fixed to the inner drill rod and rotates with the rotation of the inner drill rod. The outer rod stirring wing is fixed to the outer drill rod and rotates with the rotation of the outer drill rod. The outer rod stirring wing and the inner rod stirring wing do not interfere with each other when they rotate. The discharge channel opening is arranged on the side wall of the inner drill rod, and there are one or more discharge channel openings, and the discharge channel openings are correspondingly connected to the slurry delivery channel.

[0007] In a preferred embodiment of the present invention, a drill rod holder assembly is provided directly below the power head assembly, the drill rod holder assembly includes a positioning frame and a retainer, the positioning frame is connected to the claw, and the retainer is connected to the power head assembly; The position of the retaining frame changes as the claw slides along the slide rail, and the connection position between the retainer and the power head assembly is adjusted as the lateral position of the power head assembly changes.

[0008] In a preferred embodiment of the present invention, the positioning frame is provided with a plurality of positioning frame positioning holes, the bottom end of the retainer is provided with a plurality of retainer connecting holes, and the positioning frame and the retainer are connected through the positioning frame positioning holes and the retainer connecting holes.

[0009] In a preferred embodiment of the present invention, the positioning holes are evenly arranged at equal intervals along the horizontal direction of the positioning plate.

[0010] In a preferred embodiment of the present invention, the outer rod stirring blade includes an upper wing plate, the upper wing plate is connected to the outer drill rod, and the connection between the upper wing plate and the outer drill rod can form an angle θ, and the angle θ is less than 90°.

[0011] In a preferred embodiment of the present invention, vertical teeth can be provided on the upper wing plate.

[0012] In a preferred embodiment of the present invention, the drilling rig platform is provided with a support arm, and the drilling tower is connected to the drilling rig platform via the support arm.

[0013] In a preferred embodiment of the present invention, it further includes a movable crossbeam frame and a sliding hanger block slidably connected to the movable crossbeam frame. The movable crossbeam frame is connected to the top of the power head assembly through the sliding hanger block, and the connection method is a detachable connection.

[0014] In a preferred embodiment of the present invention, a pulley mechanism is provided at the top end of the movable crossbeam frame, and the pulley mechanism is detachably connected to the movable crossbeam frame.

[0015] In a preferred embodiment of the present invention, the chassis adopts a crawler structure or a walking structure.

[0016] Another technical solution adopted by the present invention is a method for using a multi-power head multi-layer mutual shearing mixing pile driver. The method is used for the multi-power head multi-layer mutual shearing mixing pile driver, comprising the following steps: S1. Equipment installation and commissioning: After installing the chassis, drilling platform, support arm, drilling tower, slide rails, etc., fix the slide rails on the drilling tower and install the sliding claws of the slide on the slide rails to ensure that the slide can slide smoothly; According to the required pile spacing, the power head assembly is connected and locked with the positioning holes at appropriate positions on the carriage positioning plate through the power head connection holes using bolts or screws; Install the mobile crossbeam frame, connect the power head assembly to the mobile crossbeam frame through the sliding hanger block, and debug the pulley mechanism; Install the drill rod assembly, assemble the inner drill rod and the outer drill rod, and ensure that the slurry delivery channel is unobstructed. Fix the inner rod stirring wing of the drill tool assembly to the inner drill rod, and fix the outer rod stirring wing to the outer drill rod; Install the drill rod holder assembly directly below the power head assembly and adjust the connection position of the holder according to the position of the power head assembly; Debug the equipment as a whole and check the operation of each component to ensure that the power head can normally drive the drill rod assembly and drill tool assembly to rotate, and the slurry delivery channel can deliver slurry normally; S2. Construction operation: According to the design requirements, adjust the position of the drilling rig platform or the platform rotation angle so that the central axes of the multiple sets of drilling tool assemblies are aligned with the center of the pile; Start the power head to drive the inner and outer drill rods to rotate, and the inner and outer rod stirring wings perform multi-layer mutual shear mixing on the soil; The slurry is transported to the mixing area through the slurry delivery channel, and the slurry flows out through the discharge channel on the side wall of the inner drill pipe and is fully mixed with the stirred soil; After completing the construction of one pile position, move the equipment to the next pile position and repeat the above operation until the construction task of the entire project is completed.

[0017] In a preferred embodiment of the present invention, during the S2 construction operation, the drill rod holder assembly supports and positions the drill rod assembly.

[0018] The present invention solves the defects existing in the background technology and has the following beneficial effects: (1) Reduced investment and doubled work efficiency: The present invention realizes the design of multiple power heads by configuring the power head assembly to include multiple power heads and power head connecting holes, which are locked with the positioning holes on the slide. The multiple power heads can change their fixed positions on the slide assembly to change the construction pile spacing. Compared with the existing technology, the multiple power head structures that share a drilling rig platform and a drilling tower greatly reduce the equipment investment compared with multiple separate devices. Two or more piles can be piled at one time, which increases the work efficiency by 1 or more times compared with a single device.

[0019] (2) The quality of pile formation is greatly improved: The present invention arranges the drill tool assembly into an inner rod stirring wing and an outer rod stirring wing. The inner rod stirring wing is fixed to the inner drill rod and rotates with the rotation of the inner drill rod. The outer rod stirring wing is fixed to the outer drill rod and rotates with the rotation of the outer drill rod. The outer rod stirring wing and the inner rod stirring wing do not interfere with each other when they rotate, thereby realizing a multi-layer shearing stirring drill tool. The inner rod stirring wing and the outer rod stirring wing do not interfere with each other when they rotate and work together. They can shear and stir different layers of soil, so that the soil and slurry are fully mixed, thereby improving the quality and stability of the pile.

[0020] (3) Small resistance to drill lifting: The top pulling force of a multi-power head drill rig is significantly higher than that of a single-power head drill rig. The present invention sets an upper wing plate between the outer rod stirring wing and the outer drill rod, and connects the upper wing plate to the outer drill rod. The connection forms an angle θ, and the angle θ is less than 90°. When the drill bit is lifted, the rotation trajectory of the uppermost wing plate will be a conical surface, which can produce a splitting effect on the soil above the drill bit, effectively reducing the pulling resistance and making the lifting smoother.

[0021] In addition, vertical teeth can be set on the upper wing plate. The vertical teeth can increase the pre-tearing and loosening effect of the upper soil during the lifting process, and can also effectively reduce the pulling resistance. It has a significant effect in particular for breaking the buried drilling condition caused by the initial setting of the solidified soil during the long mixing construction process.

[0022] (4) Enhanced adaptability of the equipment: Through the coordination of the positioning holes on the slide and the connection holes of the power head, the coordination of the positioning frame and the connection holes of the retainer, and the setting of the movable crossbeam frame and the sliding hanger, the position of the power head assembly can be flexibly adjusted, thereby realizing flexible adjustment of the pile spacing. At the same time, it can also give priority to ensuring the verticality and stability of the drill rod during construction, and can adapt to different spacing design requirements in the same project or different projects. The adaptability of the pile driver is stronger and wider.

[0023] (5) More reasonable force: Through the setting of the movable crossbeam frame and the sliding hanger, a set of steel wire ropes and pulleys can be used to directly pull the tops of multiple power heads synchronously, so that the force point and force direction of the steel wire rope are closer to the center of gravity of the power head, drill rod and drill bit in the same plane. The force of each structure is more direct and reasonable, avoiding the horizontal component of the power head, drill rod and drill bit, thereby avoiding additional friction on the slide rail, thereby improving the safety of the equipment and extending the service life of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and examples; Figure 1 It is a side view of a three-dimensional structural diagram of a pile mixing machine according to a preferred embodiment of the present invention; Figure 2 1 is a front view of a pile mixing machine drilling tool according to a preferred embodiment of the present invention; Figure 3 is a side view of a pile mixing machine drilling tool according to a preferred embodiment of the present invention; Figure 4 This is a diagram of the connection structure of the pile mixing machine in operation according to a preferred embodiment of the present invention; Figure 5 It is a preferred embodiment of the present invention Figure 4 A magnified view of the structure at point A; Figure 6 It is a preferred embodiment of the present invention Figure 4 A magnified view of the structure at point B in FIG; Figure 7 It is a preferred embodiment of the present invention Figure 4 A magnified view of the structure at point C in FIG; Figure 8 is a structural diagram of a drilling tool assembly according to a preferred embodiment of the present invention; Figure 9 is another structural diagram of a drilling tool assembly according to a preferred embodiment of the present invention; Figure 10 It is another structural diagram of a drilling tool assembly according to a preferred embodiment of the present invention.

[0025] In the picture: 1. Chassis; 2. Drilling platform; 3. Drilling tower; 4. Slide rail; 5. Slide; 501. Positioning plate; 502. Claw; 503. Positioning hole; 6. Power head assembly; 601. Power head; 602. Power head connection hole; 7. Drill rod assembly; 701. Inner drill rod; 702. Outer drill rod; 703. Slurry delivery channel; 8. Drill assembly; 801. Inner stirring blade; 802. Outer stirring blade; 802-1. Upper blade plate; 802-2. Angle θ; 802-3. Vertical teeth; 803. Discharge channel; 9. Beam frame; 10. Sliding hanger block; 11. Cage assembly; 1101. Positioning frame; 1102. Cage; 1103. Positioning frame positioning hole; 1104. Cage connection hole; 12. Pulley mechanism. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figure 1-10 As shown, a multi-power head multi-layer shear mixing pile driver includes: a chassis 1, a drilling rig platform 2, a drilling tower 3, a slide rail 4, a slide 5, a power head 601 assembly 6, a drill rod assembly 7, and a drilling tool assembly 8.

[0030] The drilling rig platform 2 is installed on the chassis 1, the slide rail 4 is fixed on the drilling tower 3, the slide 5 includes a positioning plate 501 and a claw 502, the positioning plate 501 is provided with a plurality of positioning holes 503, the claw 502 can slide along the extension direction of the slide rail 4 of the drilling tower 3, the power head assembly 6 includes a power head 601, a power head connecting hole 602, the power head connecting hole 602 can be locked with the positioning hole 503, the drill rod assembly 7 includes an inner drill rod 701, an outer drill rod 702, and a slurry delivery channel 703, the slurry delivery channel 703 is one or more, at least one slurry delivery channel 703 is located inside the drill rod assembly 7, the drill tool assembly 8 includes an inner rod stirring wing 801, an outer rod stirring wing 802, a discharge channel 803, and an inner rod The stirring wing 801 is fixed on the inner drill rod 701 and rotates with the rotation of the inner drill rod 701. The outer rod stirring wing 802 is fixed on the outer drill rod 702 and rotates with the rotation of the outer drill rod 702. The outer rod stirring wing 802 and the inner rod stirring wing 801 do not interfere with each other when rotating. The discharge channel opening 803 is set on the side wall of the inner drill rod 701. There are one or more discharge channel openings 803. The discharge channel openings 803 are correspondingly connected to the slurry delivery channel 703. A multi-layer shearing and stirring drill tool is adopted. The inner rod stirring wing 801 and the outer rod stirring wing 802 do not interfere with each other when rotating and work together, which can perform shearing and stirring on different layers of soil, so that the soil and slurry are fully mixed, thereby improving the quality and stability of the pile.

[0031] The power head assembly 6 includes a power head 601, the power head 601 is at least two, the power head connection hole 602, the power head connection hole 602 can be locked with the positioning hole 503, the drill rod assembly 7 includes an inner drill rod 701, an outer drill rod 702, a slurry delivery channel 703, the slurry delivery channel 703 is one or more, at least one slurry delivery channel 703 is located inside the drill rod assembly 7, the drill tool assembly 8 includes an inner rod stirring wing 801, an outer rod stirring wing 802, and a discharge channel port 803, the inner rod stirring wing 801 is fixed on the inner drill rod 701, and the inner drill rod 7 is connected to the outer drill rod 702. 01 rotates, the outer rod stirring wing 802 is fixed on the outer drill rod 702, and rotates with the rotation of the outer drill rod 702. The outer rod stirring wing 802 and the inner rod stirring wing 801 do not interfere with each other when they rotate. Compared with the existing technology, through the design of multiple power heads 601 and multiple power heads 601 can change the fixed position on the slide assembly 5 to change the construction pile spacing, and share the structure of a drilling rig platform 2 and a drilling tower 3. Compared with multiple separate devices, the equipment investment is greatly reduced, and two or more piles can be formed at a time, which is 1 times or more times more efficient than a single device.

[0032] In a preferred embodiment of the present invention, a drill rod holder assembly 11 is provided just below the power head 601 assembly 6. The drill rod holder assembly 11 includes a positioning frame 1101 and a retainer 1102. The positioning frame 1101 is connected to the claw 502, and the retainer 1102 is connected to the power head 601 assembly 6. The position of the retainer changes as the claw 502 slides along the slide rail 4. The connection position of the retainer 1102 and the power head 601 assembly 6 changes as the lateral position of the power head 601 assembly 6 changes. A plurality of positioning frame positioning holes 1103 are provided on the positioning frame 1101, and a plurality of retainer connection holes 1103 are provided at the bottom of the retainer 1102. Connecting hole 1104, the positioning frame 1101 and the retainer 1102 are connected through the positioning frame positioning hole 1103 and the retainer connecting hole 1104. Through the cooperation of the positioning hole 503 on the slide 5 and the power head connecting hole 602, the cooperation of the positioning frame 1101 and the retainer connecting hole 1104, and the setting of the movable crossbeam frame 9 and the sliding hanger 10, the position of the power head assembly 6 can be flexibly adjusted, thereby realizing flexible adjustment of the pile spacing, and at the same time, it can give priority to ensuring the verticality and stability of the drill rod during construction, and can adapt to different spacing design requirements in the same project or different projects. The pile driver has stronger and wider adaptability.

[0033] In a preferred embodiment of the present invention, the positioning holes 503 are evenly arranged at equal intervals along the horizontal direction of the positioning plate 501. Specifically, the positioning holes 503 are symmetrically distributed along the central axis of the positioning plate 501 and are evenly arranged at equal intervals of 50 mm horizontally.

[0034] In a preferred embodiment of the present invention, the outer rod stirring wing 802 includes an upper wing plate 802-1, which is connected to the outer drill rod 702. The connection between the upper wing plate 802-1 and the outer drill rod 702 can form an angle θ802-2, and the angle θ802-2 is less than 90°. By arranging the upper wing plate 802-1 between the outer rod stirring wing 802 and the outer drill rod 702, and setting the angle θ802-2 at the connection between the upper wing plate 802-1 and the outer drill rod 702 to be less than 90°, when the drill bit is lifted, the rotation trajectory of the uppermost wing plate 802-1 will be a conical surface, which can produce a splitting effect on the soil above the drill bit, effectively reducing the pulling resistance, and making the lifting smoother.

[0035] In a preferred embodiment of the present invention, vertical teeth 802-3 can be provided on the upper wing plate 802-1. The vertical teeth 802-3 can increase the pre-tearing and loosening effect of the upper soil during the lifting process, and can also effectively reduce the pulling resistance, especially for breaking the long mixing construction process and the initial setting of the solidified soil, which leads to buried drilling conditions.

[0036] In a preferred embodiment of the present invention, the drilling rig platform 2 is provided with a support arm, and the drilling tower 3 is connected to the drilling rig platform 2 via the support arm.

[0037] In a preferred embodiment of the present invention, it further includes a movable crossbeam frame 9 and a sliding hanger 10 slidably connected to the movable crossbeam frame 9. The movable crossbeam frame 9 is connected to the top of the power head assembly 6 through the sliding hanger 10. The connection method is a detachable connection, preferably a pin connection. A pulley mechanism 12 is provided at the top of the movable crossbeam frame 9. The pulley mechanism 12 is detachably connected to the movable crossbeam frame 9. Through the arrangement of the movable crossbeam frame 9 and the sliding hanger 10, a set of steel wire ropes and pulleys are used to directly and synchronously pull the tops of multiple power heads 601, so that the force point and force direction of the steel wire rope are closer to the center of gravity of the power head 601, drill rod, and drill bit in a plane, and the force of each structure is more direct and reasonable, avoiding the generation of horizontal force components on the power head 601, drill rod, and drill bit, thereby avoiding additional friction on the slide rail 4, thereby improving the safety of the equipment and extending the service life of the machine.

[0038] In a preferred embodiment of the present invention, the chassis 1 adopts a crawler structure or a walking structure, which is convenient for movement on a strip-shaped construction site and helps to speed up construction efficiency.

[0039] A method for using a multi-power head multi-layer shear mixing pile driver includes the following steps: S1. Equipment installation and commissioning: After installing the chassis 1, drilling platform 2, support arm, drilling tower 3, slide rail 4, etc., fix the slide rail 4 on the drilling tower 3, install the claw 502 of the slide 5 on the slide rail 4, and ensure that the slide 5 can slide smoothly; According to the required pile spacing, the power head assembly 6 is connected and locked with the positioning holes 503 at appropriate positions on the carriage positioning plate 501 through the power head connection hole 602 using bolts or screws; Install the mobile crossbeam frame 9, connect the power head assembly 6 to the mobile crossbeam frame 9 through the sliding hanger 10, and debug the pulley mechanism 12; Install the drill rod assembly 7, assemble the inner drill rod 701 and the outer drill rod 702, and ensure that the slurry delivery channel 703 is unobstructed. Fix the inner rod stirring wing 801 of the drill tool assembly 8 to the inner drill rod 701, and fix the outer rod stirring wing 802 to the outer drill rod 702; Install the drill rod holder assembly 11 just below the power head assembly 6, and adjust the connection position of the holder 1102 according to the position of the power head assembly 6; The equipment is debugged as a whole, and the operation of each component is checked to ensure that the power head 601 can normally drive the drill rod assembly 7 and the drill tool assembly 8 to rotate, and the slurry delivery channel 703 can normally deliver slurry.

[0040] S2, construction operation: according to the design requirements, adjust the position of the drilling rig platform 2 or the platform rotation angle so that the central axes of the multiple sets of drilling tool assemblies 8 are aligned with the pile center; Start the power head 601 to drive the inner drill rod 701 and the outer drill rod 702 to rotate, and the inner rod stirring blade 801 and the outer rod stirring blade 802 perform multi-layer mutual shear mixing on the soil; The slurry is transported to the mixing area through the slurry delivery channel 703, and the slurry flows out through the discharge channel opening 803 on the side wall of the inner drill rod 701 and is fully mixed with the stirred soil.

[0041] After completing the construction of one pile position, the equipment is moved to the next pile position and the above operation is repeated until the construction task of the entire project is completed. During the construction process, the drill rod holder assembly 11 supports and positions the drill rod assembly 7. The power mechanism and construction method for connecting and disconnecting drill rods at low altitude avoid the need to handle the upper joint of the drill rod to be installed or disconnected at high altitude. The entire process of connecting or disconnecting drill rods is completed at an appropriate working height from the ground, ensuring the safety and convenience of construction.

[0042] Example 1: The soft foundation treatment project of a highway in a hilly area was constructed using full-soil reinforcement. The designed diameter of the mixing pile was 700mm. Due to the undulation of the stratum, the thickness of the soft soil varied in different sections. In order to ensure that the bearing capacity of the roadbed met the design requirements, different mixing pile design parameters were used for construction. Pile type 1 was: pile length 12m, pile spacing 1.5m; pile type 2 was: pile length 15m, pile spacing 1.2m. The total construction volume of the mixing piles was 100,000 meters, and the required construction period was 30 days. Calculations showed that 12 conventional unidirectional mixing pile equipment were required. After scheme comparison, a multi-power head multi-layer mutual shear mixing pile machine with adjustable pile spacing and a pile frame height of 20m was adopted, requiring only 6 equipment to be brought on site.

[0043] The specific construction method is as follows: After installing the chassis 1, drilling platform 2, support arm, drilling tower 3, and slide rail 4, secure the slide rail 4 to the drilling tower 3 and install the claw 502 of the slide 5 on the slide rail 4 to ensure that the slide 5 can slide smoothly. According to the pile spacing of 1.5m and 1.2m, the power head assembly 6 is set to the starting position. The slide 5 positioning plate 501 is bolted to the power head assembly 6 through the connection hole of the power head assembly 6 and the positioning hole 503 of the slide 5 positioning plate 501, and the adjustment distance of the claw 502 of the slide 5 on the slide rail 4 is ensured to be 1.5m and 1.2m.

[0044] Install the movable crossbeam frame 9, connect the power head assembly 6 to the movable crossbeam frame 9 through the sliding hanger 10, and debug the pulley mechanism 12 to ensure that the pulley mechanism 12 can operate normally, then install the drill rod assembly 7, assemble the inner drill rod 701 and the outer drill rod 702, and check the slurry delivery channel 703 to ensure that the slurry delivery channel 703 is unobstructed, fix the inner rod stirring wing 801 of the drill tool assembly 8 on the inner drill rod 701, and fix the outer rod stirring wing 802 on the outer drill rod 702, install the drill rod holder assembly 11 directly below the power head assembly 6, adjust the connection position of the retainer 1102 according to the position of the power head assembly 6, and ensure that the drill rod holder assembly 11 is located directly below the power head assembly 6.

[0045] Debug the equipment as a whole, check the operation of each component, ensure that the power head 601 can drive the drill rod assembly 7 and the drill tool assembly 8 to rotate normally, and the slurry delivery channel 703 can deliver slurry normally, adjust the position of the drilling rig platform 2 or the platform rotation angle so that the center axes of the two sets of drill tool assemblies 8 are aligned with the centers of the two piles respectively.

[0046] Start the power head 601, which drives the inner drill rod 701 and the outer drill rod 702 to rotate. The inner rod stirring wings 801 and the outer rod stirring wings 802 perform multi-layer shear mixing on the soil. The slurry is transported to the mixing area through the slurry delivery channel 703. The slurry flows out through the discharge channel 803 on the side wall of the inner drill rod 701 and is fully mixed with the stirred soil, which greatly improves the pile quality and efficiency.

[0047] The drilling tool used in this embodiment is as follows Figure 9 As shown, an upper wing plate 802-1 is set between the outer rod stirring wing 802 and the outer drill rod 702, and the upper wing plate 802-1 is connected to the outer drill rod 702, forming an angle θ802-2 at the connection, and the angle θ802-2 is less than 90°. When the drill bit is lifted, the rotation trajectory of the uppermost wing plate 802-1 will be a conical surface, which can produce a splitting effect on the soil above the drill bit, effectively reducing the pulling resistance and making the lifting smoother.

[0048] The spacing between the two sets of drilling tools can be adjusted through a series of detachable and positionable structures to meet the different spacing requirements of the design. Two pile drivers of the same model with different power head 601 spacings can be used to specifically construct a certain spacing to improve work efficiency. Alternatively, one pile driver can be used to construct mixing piles with different parameters in succession by adjusting the power head 601 spacing in the middle, thereby reducing machinery investment and lowering costs.

[0049] Example 2: The working conditions different from Example 1 are: the design depth of the mixing piles is twice that of Example 1, the construction time of a single pile is doubled, the solidified material is ejected when drilling, and as time goes by, initial setting begins to occur, and the resistance to pulling out the drill increases. At the same time, as the depth increases, the soil layer becomes harder, and the resistance to pulling out the drill at deep depths further increases.

[0050] In this working condition, the drilling rig structure used is basically the same as that of the first embodiment, the only difference is that a different drilling tool assembly 8 is used, such as Figure 10 As shown, vertical teeth 802-3 are fixed on the uppermost wing plate 802-1 of the outer rod stirring wing 802. During the process of lifting the drill, due to the rotation of the outer drill rod 702, the vertical teeth 802-3 can pre-crack and loosen the initially solidified soil above the drill assembly 8, which greatly reduces the resistance to lifting the drill, reduces the burden on the lifting equipment, and makes the drill lifting smoother.

[0051] Example 3: A soft foundation treatment project for a large industrial plant in a plain area was under construction. The treatment method was full-floor reinforcement. The designed diameter of the mixing pile was 700mm, the designed mixing depth was 25m, the pile-to-pile spacing was 1.5m, the total construction volume of the mixing pile was 100,000 meters, and the required construction period was 30 days. Calculations showed that 12 conventional one-way mixing pile equipment were required, and the depth exceeded 10m. The construction quality of conventional mixing pile machines was difficult to guarantee. After comparing the options, a three-power head 601 multi-layer mutual shear mixing pile machine with adjustable pile spacing was adopted, the pile frame height was 30m, and 4 equipment were brought into the site.

[0052] The specific construction method is as follows: After installing the chassis 1, drilling platform 2, support arm, drilling tower 3, and slide rail 4, secure the slide rail 4 to the drilling tower 3 and install the claw 502 of the slide 5 on the slide rail 4 to ensure that the slide 5 can slide smoothly. Based on the pile spacing of 1.5m, set the power head assembly 6 to the starting position, and bolt the slide 5 positioning plate 501 to the power head assembly 6 through the connecting hole of the power head assembly 6 and the positioning hole 503 of the slide 5 positioning plate 501, ensuring that the adjustment distance of the claw 502 of the slide 5 on the slide rail 4 is 1.5m.

[0053] Install the movable crossbeam frame 9, connect the power head assembly 6 to the movable crossbeam frame 9 through the sliding hanger 10, and debug the pulley mechanism 12 to ensure that the pulley mechanism 12 can operate normally, then install the drill rod assembly 7, assemble the inner drill rod 701 and the outer drill rod 702, and check the slurry delivery channel 703 to ensure that the slurry delivery channel 703 is unobstructed, fix the inner rod stirring wing 801 of the drill tool assembly 8 on the inner drill rod 701, and fix the outer rod stirring wing 802 on the outer drill rod 702, install the drill rod holder assembly 11 directly below the power head assembly 6, adjust the connection position of the retainer 1102 according to the position of the power head assembly 6, and ensure that the drill rod holder assembly 11 is located directly below the power head assembly 6.

[0054] Debug the equipment as a whole, check the operation of each component, ensure that the power head 601 can drive the drill rod assembly 7 and the drill tool assembly 8 to rotate normally, and the slurry delivery channel 703 can deliver slurry normally, adjust the position of the drilling rig platform 2 or the platform rotation angle so that the center axes of the two sets of drill tool assemblies 8 are aligned with the centers of the two piles respectively.

[0055] Start the power head 601, which drives the inner drill rod 701 and the outer drill rod 702 to rotate. The inner rod stirring wings 801 and the outer rod stirring wings 802 perform multi-layer shear mixing on the soil. The slurry is transported to the mixing area through the slurry delivery channel 703. The slurry flows out through the discharge channel 803 on the side wall of the inner drill rod 701 and is fully mixed with the stirred soil, which greatly improves the pile quality and efficiency.

[0056] The drilling tool used in this embodiment is as follows Figure 8 As shown, the angle θ802-2 between the top wing plate 802-1 and the outer drill rod 702 is 45°, and vertical teeth 802-3 are also fixed to the top wing plate 802-1. The combined effect of tilting the top wing plate 802-1 and adding vertical teeth 802-3 reduces the upward pull resistance, which is more beneficial for the construction of large-diameter mixing piles.

[0057] The three power heads 601 on the power head assembly 6 of the present invention can change their fixed positions on the slide 5 assembly to change the construction pile spacing. The drill rod assembly 7 includes inner and outer drill rods 702 and a slurry delivery channel 703, which respectively drive the inner and outer rod stirring wings 802 of the drill tool assembly 8 to rotate in opposite directions without interfering with each other. This can greatly improve the quality of the mixing piles while significantly improving the construction efficiency, and meet the design requirements of various pile diameters and spacings, thereby optimizing equipment investment and maximizing equipment utilization, and effectively reducing costs.

[0058] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patented invention. It should be noted that those skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention. These variations and improvements are equivalent modifications and improvements to the above embodiments based on the essential technology of the present invention and fall within the scope of protection of the present invention.

Claims

1. A multi-power head multi-layer shear mixing pile driver, characterized in that: include: Chassis (1), drilling rig platform (2), drilling tower (3), slide rail (4), slide (5), power head assembly (6), drill rod assembly (7), drilling tool assembly (8); The drilling rig platform (2) is mounted on the chassis (1); The slide rail (4) is fixed on the drilling tower (3); The slide (5) comprises a positioning plate (501) and a claw (502); the positioning plate (501) is provided with a plurality of positioning holes (503); and the claw (502) is capable of sliding along the extension direction of the slide rail (4); The power head assembly (6) comprises a power head (601) and a power head connecting hole (602), there are at least two power heads (601), and the power head connecting hole (602) can be locked with the positioning hole (503); The drill rod assembly (7) comprises an inner drill rod (701), an outer drill rod (702), and a slurry delivery channel (703). There are one or more slurry delivery channels (703), and at least one of the slurry delivery channels (703) is located inside the drill rod assembly (7); The drill tool assembly (8) comprises an inner rod stirring wing (801), an outer rod stirring wing (802), and a discharge channel (803); the inner rod stirring wing (801) is fixed to the inner drill rod (701) and rotates along with the rotation of the inner drill rod (701); the outer rod stirring wing (802) is fixed to the outer drill rod (702) and rotates along with the rotation of the outer drill rod (702); the outer rod stirring wing (802) and the inner rod stirring wing (801) do not interfere with each other during rotation; The discharge channel opening (803) is arranged on the side wall of the inner drill rod (701), there are one or more discharge channel openings (803), and the discharge channel openings (803) are correspondingly connected to the slurry delivery channel (703).

2. The multi-power head multi-layer shear mixing pile driver according to claim 1, characterized in that: A drill rod holder assembly (11) is provided directly below the power head assembly (6), the drill rod holder assembly (11) comprising a positioning frame (1101) and a retainer (1102), the positioning frame (1101) being connected to the travel claw (502), and the retainer (1102) being connected to the power head assembly (6); The position of the retaining frame assembly (11) changes as the claw (502) slides along the slide rail (4), and the connection position of the retainer (1102) and the power head assembly (6) is adjusted as the lateral position of the power head assembly (6) changes.

3. The multi-power head multi-layer shear mixing pile driver according to claim 2, characterized in that: The positioning frame (1101) is provided with a plurality of positioning frame positioning holes (1103), the bottom end of the retainer (1102) is provided with a plurality of retainer connection holes (1104), and the positioning frame (1101) and the retainer (1102) are connected via the positioning frame positioning holes (1103) and the retainer connection holes (1104).

4. The multi-power head multi-layer shear mixing pile driver according to claim 1, characterized in that: The positioning holes (503) are evenly arranged at equal intervals along the horizontal direction of the positioning plate (501).

5. The multi-power head multi-layer shear mixing pile driver according to claim 1, characterized in that: The outer rod stirring wing (802) comprises an upper wing plate (802-1), the upper wing plate (802-1) is connected to the outer drill rod (702), and an angle θ (802-2) can be formed at the connection between the upper wing plate (802-1) and the outer drill rod (702), and the angle θ (802-2) is less than 90°.

6. The multi-power head multi-layer shear mixing pile driver according to claim 5, characterized in that: The upper wing plate (802-1) can be provided with vertical teeth (802-3).

7. The multi-power head multi-layer shear mixing pile driver according to claim 1, characterized in that: It also includes a movable crossbeam frame (9) and a sliding hanger (10) slidably connected to the movable crossbeam frame (9); the movable crossbeam frame (9) is connected above the power head assembly (6) via the sliding hanger (10), and the connection method is a detachable connection.

8. The multi-power head multi-layer shear mixing pile driver according to claim 7, characterized in that: A pulley mechanism (12) is provided at the top end of the movable crossbeam frame (9), and the pulley mechanism (12) is connected to the movable crossbeam frame (9) in a detachable manner.

9. A method for using a multi-power head multi-layer shear mixing pile driver, characterized by: The method of use is used for the multi-power head multi-layer mutual shear mixing pile driver according to any one of claims 1 to 8, comprising the following steps: S1. Equipment installation and commissioning: After installing the chassis, drilling platform, support arm, drilling tower, slide rail, etc., fix the slide rail (4) on the drilling tower (3), install the claw (502) of the slide (5) on the slide rail (4), and ensure that the slide (5) can slide smoothly; According to the required pile spacing, the power head assembly (6) is connected and locked with the positioning holes (503) at appropriate positions on the positioning plate (501) of the slide (5) through the power head connection hole (602) using bolts or screws; Install the movable crossbeam frame (9), connect the power head assembly (6) to the movable crossbeam frame (9) through the sliding hanger (10), and debug the pulley mechanism (12); Install the drill rod assembly (7), assemble the inner drill rod (701) and the outer drill rod (702), and ensure that the slurry delivery channel (703) is unobstructed. Fix the inner rod stirring wing (801) of the drill tool assembly (8) to the inner drill rod (701), and fix the outer rod stirring wing (802) to the outer drill rod (702); Install the drill rod holder assembly (11) directly below the power head assembly (6), and adjust the connection position of the holder (1102) according to the position of the power head assembly (6); Debug the entire equipment and check the operation of each component to ensure that the power head (601) can normally drive the drill rod assembly (7) and the drill tool assembly (8) to rotate, and the slurry delivery channel (703) can normally deliver slurry; S2. Construction operation: According to the design requirements, adjust the position of the drilling rig platform or the platform rotation angle so that the central axes of the multiple sets of drilling tool assemblies are aligned with the center of the pile; The power head (601) is started to drive the inner drill rod (701) and the outer drill rod (702) to rotate, and the inner rod stirring blade (801) and the outer rod stirring blade (802) perform multi-layer mutual shear stirring on the soil; The slurry is transported to the mixing area through the slurry transport channel (703), and the slurry flows out through the discharge channel opening (803) on the side wall of the inner drill rod (701) and is fully mixed with the stirred soil; After completing the construction of one pile position, move the equipment to the next pile position and repeat the above operation until the construction task of the entire project is completed.

10. The method for using a multi-power head multi-layer shear mixing pile driver according to claim 9, characterized in that: During the S2 construction operation, the drill rod holder assembly (11) supports and positions the drill rod assembly (7).

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