Mixing structure for curing slurry muck of empty pile section of cast-in-place pile

Abstract

The present application relates to the technical field of cast-in-place pile construction, and discloses a stirring structure for curing slurry muck of a cast-in-place pile empty pile section, which comprises a excavator with a removed excavating bucket, the excavator comprising a movable body and a swing arm, a power head being hingedly connected to the swing arm, a stirring drill rod being connected to the power head, and a stirring drill bit being arranged at the bottom of the stirring drill rod; a hollow cylinder is movably arranged on the outer periphery of the lower section, and the hollow cylinder is movably connected to the lower section; the power head drives the stirring drill rod and the stirring drill bit to synchronously rotate, slurry is sprayed out of a slurry outlet, high-pressure gas is sprayed out of a gas outlet, the drill rod blades and the drill bit blades synchronously stir the slurry muck and the curing slurry, and the hollow cylinder is in a free state and is pressed and rotated by the slurry muck. The slurry muck is rapidly cured by stirring the curing slurry and the slurry muck and spraying the high-pressure gas, and the strength of the original soil can be reached in a short time, thereby ensuring the normal walking of the mechanical equipment in the construction site.

Description

Technical Field

[0001] This invention patent relates to the technical field of cast-in-place pile construction, and more specifically, to a mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile. Background Technology

[0002] In urban construction pile foundation engineering, most building foundations utilize reinforced concrete bored piles 10. This involves first drilling a hole in the ground, then injecting bentonite slurry into the hole to form a protective wall. This slurry balances ground pressure and prevents hole wall collapse; injecting the prepared slurry into the pile hole effectively prevents wall collapse. After drilling to the designed pile bottom elevation, a reinforcing cage is installed in the slurry-filled hole, followed by the installation of a pouring pipe to pour concrete into the bottom of the hole, thus forming the reinforced concrete bored pile 10. Since the top of a typical bored pile 10 is located 10-20m below ground level, after pouring concrete to the designed pile top elevation, there is still a 10-20m depth of flowing slurry in the upper part of the pile hole. This area without reinforced concrete is usually called the empty pile section 20, which is generally filled with flowing bentonite slurry. Figure 1 As shown.

[0003] In existing technology, the mud from the empty pile section 20 is pumped to a mud pit using a mud pump, then transported off the site using a special tanker truck, and finally backfilled with slag. However, the slag mixes with the remaining mud in the pile hole to form a mud-slag mixture with a high water content, resulting in extremely low bearing capacity of the foundation at the pile hole location, making it impossible for large machinery to move around.

[0004] Alternatively, cement can be used to solidify the mud in the empty pile section 20. However, due to the insufficient reaction between cement and fine-particle mud, the cement content is high, the strength of the solidified mud is low, and the solidification reaction is slow, which is not conducive to large-scale application. Summary of the Invention

[0005] The purpose of this invention is to provide a mixing structure for solidifying mud and slag in empty pile sections, aiming to solve the problem of mud being difficult to handle in existing technologies.

[0006] The present invention is implemented as follows: a mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile includes an excavator that removes the bucket. The excavator includes a movable body and a swing arm connected to the body. A power head is hinged to the swing arm. A mixing drill rod is connected to the power head. A mixing drill bit that is driven to rotate synchronously by the mixing drill rod is provided at the bottom of the mixing drill rod.

[0007] The lower part of the mixing drill rod has a lower section placed in the empty pile section, and the mixing drill bit is connected to the bottom of the lower section; the outer periphery of the mixing drill bit is provided with a plurality of drill bit blades, and the plurality of drill bit blades are arranged at intervals along the circumference of the mixing drill bit; the outer periphery of the lower section is provided with a plurality of drill rod blades, and the plurality of drill rod blades are arranged at intervals along the circumference and axial direction of the lower section.

[0008] The outer periphery of the stirring drill bit is provided with a slurry outlet for spraying solidified slurry and a high-pressure gas outlet for spraying gas; a hollow cylinder is movably fitted around the outer periphery of the lower section, the hollow cylinder is movably connected to the lower section, and the hollow cylinder and the lower section enclose a stirring area, in which multiple drill rod blades are located; the outer periphery of the hollow cylinder is provided with multiple outer periphery openings, which are arranged at intervals along the circumference of the lower section, and the stirring area communicates with the outside through the outer periphery openings;

[0009] When the lower section and the mixing drill bit are placed in the mud and slag of the empty pile section, the power head drives the mixing drill rod to rotate, the mixing drill bit rotates synchronously, the slurry outlet sprays out solidified slurry, the air outlet sprays out high-pressure gas, the drill rod blades and the drill bit blades mix the mud and slag and solidified slurry synchronously, and the hollow cylinder is in a free state and rotates under the pressure of the mud and slag.

[0010] Optionally, the outer periphery of the stirring drill bit is provided with a plurality of slurry outlets and a plurality of air outlets, and the plurality of slurry outlets and the plurality of air outlets are arranged in a staggered manner along the circumference of the stirring drill bit.

[0011] Optionally, along the axial direction of the stirring drill bit, adjacent slurry outlets and air outlets are arranged vertically offset; along the axial direction of the stirring drill bit, the air outlet extends vertically in a flat strip shape, and along the circumference of the stirring drill bit, the slurry outlet extends circumferentially in a flat strip shape.

[0012] Optionally, the outer periphery of the stirring drill bit is provided with an inclined ring, which is located above the drill bit blades, the slurry outlet and the air outlet, and is arranged around the outer periphery of the stirring drill bit; the inner end of the inclined ring is connected to the outer periphery of the stirring drill bit, and the outer end of the inclined ring is inclined downward away from the stirring drill bit; the inclined ring is provided with a plurality of through holes running vertically through it.

[0013] Optionally, an upper shaft is hinged to the swing arm, an upper seat is connected to the upper shaft, the swing arm is hinged to the middle of the upper shaft, and the upper seat is located below the upper shaft and is hinged to both ends of the upper shaft.

[0014] The upper seat is movably connected to the lower shaft, the middle part of the lower shaft is hinged to the upper seat, the power head is provided with a rotatably arranged lower seat, the lower seat is hinged to both ends of the lower seat, and the upper shaft and the lower shaft are arranged perpendicularly to each other.

[0015] As the swing arm swings up and down, the hinged linkage between the upper shaft, upper seat, lower shaft, and lower seat restricts the swing of the mixing drill rod and guides the mixing drill rod to move up and down in the empty pile section.

[0016] Optionally, the stirring drill rod is hollow and has a rod cavity extending axially from the stirring drill rod. The rod cavity is provided with a slurry outlet pipe and an air outlet pipe. The upper end of the slurry outlet pipe is connected to the grouting pump, and the lower end of the slurry outlet pipe is connected to the slurry outlet. The upper end of the air outlet pipe is connected to the air compressor, and the lower end of the air outlet pipe is connected to the air outlet.

[0017] Optionally, the bottom of the stirring drill bit is provided with a longitudinally arranged guide plate. Along the top-to-bottom direction of the guide plate, the two sides of the guide plate are arranged inwardly at an angle. The bottom of the guide plate is provided with a plurality of guide cone teeth, which are spaced apart along the length direction of the guide plate.

[0018] Optionally, a fan-shaped plate is provided on both sides of the guide plate. The upper end of the fan-shaped plate is hinged to the side of the guide plate, and the lower end of the fan-shaped plate extends downward and is inclined outward away from the guide plate. A return spring is provided between the fan-shaped plate and the guide plate, and the two ends of the return spring are respectively connected to the fan-shaped plate and the guide plate.

[0019] During the mixing process in the empty pile section, as the rotation speed changes, the two fan-shaped plates swing relative to or away from each other, mixing the mud, slag, and solidified slurry around the mixing drill bit.

[0020] Optionally, the top and bottom of the hollowed-out cylinder are respectively provided with horizontally arranged frames, the two horizontal frames are arranged vertically at intervals, and the lower section passes through the middle of the two horizontal frames and is rotatably connected to the horizontal frames.

[0021] The horizontal frame has multiple through-hole areas that connect to the stirring area; the outer periphery of the hollow cylinder has multiple longitudinal strips that are spaced apart along the circumference of the lower section, and the stirring area is formed by the longitudinal strips and the lower section, with the outer periphery openings formed between adjacent longitudinal strips.

[0022] The longitudinal strips are located between two horizontal frames, with their two ends respectively abutting the outer perimeter of the two horizontal frames.

[0023] Optionally, longitudinally arranged oscillating blades are provided on both sides of the longitudinal strip. The inner end of the oscillating blade is hinged to the longitudinal strip through a hinge shaft, and the outer end of the oscillating blade extends toward the middle of the stirring interval. The outer ends of two adjacent oscillating blades are staggered towards each other. A driving torsion spring is sleeved on the hinge shaft. When the oscillating blade is in a free state, the oscillating blade is located in the stirring interval.

[0024] During the mixing process in the empty pile section, the hollow cylinder is in a free state and rotates freely under the pressure of mud and slag. The swing plate swings back and forth under the pressure of mud and slag and the restoring force of the driving torsion spring, and simultaneously mixes the mud, slag and solidified slurry.

[0025] Compared with existing technologies, the mixing structure for solidifying mud and slag in the empty pile section of cast-in-place piles provided by this invention is very convenient to construct by modifying an excavator. Excavators are generally available on construction sites; when construction is needed, simply disassemble the bucket and replace it with a mixing drill rod, then connect it to the grouting pipe and high-pressure air pipe at the back end. This reduces the costs of bringing in and out of other mixing equipment and machinery costs, thus significantly reducing construction costs.

[0026] Simultaneously, slurry and high-pressure gas are delivered to the mixing drill bit, and then sprayed out through the air outlet and slurry outlet respectively. The drill bit blades and drill rod blades cut and mix the mud and slag and solidify the slurry. The compressed air delivered into the mud and slag has a lower density than the mud, so it rises in the mud. Through a series of tumbling, rising, rotating and convection actions, the solidified slurry reacts fully with the mud and slag, so that the mud and slag can be solidified quickly and reach the strength of the original soil in a short time, thereby ensuring the normal operation of the mechanical equipment on the construction site.

[0027] Furthermore, by movably connecting the hollow cylinder to the lower outer periphery of the mixing drill rod, it effectively prevents the drill rod blades and drill bit blades from being stirred against the borehole wall. Because the hollow cylinder is movably connected, it is in a free state when the mixing drill rod rotates; therefore, the hollow cylinder prevents the solidified slurry from rotating freely with the rotation of the drill bit blades and drill rod blades, ensuring that the solidified slurry and slag mud are mixed more evenly. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of a reinforced concrete bored pile in the prior art provided by the present invention;

[0029] Figure 2 This is a construction schematic diagram of the mixing structure for solidifying mud and slag in the empty pile section of the cast-in-place pile provided by the present invention;

[0030] Figure 3 This is a three-dimensional schematic diagram of the power head provided by the present invention;

[0031] Figure 4This is a three-dimensional schematic diagram of the bottom of the stirring drill rod and the stirring drill bit provided by the present invention;

[0032] Figure 5 This is a three-dimensional schematic diagram of the stirring drill bit provided by the present invention;

[0033] Figure 6 This is a three-dimensional schematic diagram of the hollowed-out cylinder provided by the present invention;

[0034] Figure 7 This is a front view schematic diagram of the guide plate provided by the present invention;

[0035] Figure 8 This is a partial schematic diagram of the longitudinal strip provided by the present invention;

[0036] Figure 9 This is a three-dimensional schematic diagram of the driving torsion spring provided by the present invention being sleeved on the hinge shaft. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0039] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention 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. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0040] Reference Figure 1-9 The image shown is a preferred embodiment of the present invention.

[0041] The present invention provides a mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile, including an excavator 100 with a bucket removed. The excavator 100 includes a movable body and a swing arm 110 connected to the body. A power head 200 is hinged to the swing arm 110. A mixing drill rod 300 is connected to the power head 200. A mixing drill bit 400 is provided at the bottom of the mixing drill rod 300 and rotates synchronously driven by the mixing drill rod 300.

[0042] The lower part of the mixing drill rod 300 has a lower section placed in the empty pile section, and the mixing drill bit 400 is connected to the bottom of the lower section; the outer periphery of the mixing drill bit 400 is provided with a plurality of drill bit blades 410, and the plurality of drill bit blades 410 are arranged at intervals along the circumference of the mixing drill bit 400; the outer periphery of the lower section is provided with a plurality of drill rod blades 310, and the plurality of drill rod blades 310 are arranged at intervals along the circumference and axial direction of the lower section.

[0043] The outer periphery of the mixing drill bit 400 is provided with a slurry outlet 402 for spraying solidified slurry and an air outlet 401 for spraying high-pressure gas; a hollow cylinder 500 is movably sleeved on the outer periphery of the lower section, the hollow cylinder 500 is movably connected to the lower section, and the hollow cylinder 500 and the lower section enclose a mixing area, in which multiple drill rod blades 310 are located; the outer periphery of the hollow cylinder 500 is provided with multiple outer periphery openings, which are arranged at intervals along the circumference of the lower section, and the mixing area is connected to the outside through the outer periphery openings;

[0044] When the lower section and the mixing drill bit 400 are placed in the mud and slag of the empty pile section, the power head 200 drives the mixing drill rod 300 to rotate, the mixing drill bit 400 rotates synchronously, the slurry outlet sprays out solidified slurry, the air outlet 401 sprays out high-pressure gas, the drill rod blade 310 and the drill bit blade 410 mix the mud and slag and solidified slurry synchronously, and the hollow cylinder 500 is in a free state and rotates under the pressure of the mud and slag.

[0045] The aforementioned mixing structure for solidifying slurry and slag in the empty pile section of cast-in-place piles is very convenient to construct by modifying an excavator 100. Excavators 100 are commonly found on construction sites; when needed, simply disassemble the bucket and replace it with a mixing drill rod 300, then connect it to the slurry outlet pipe 41 and high-pressure air pipe at the back end. This reduces the costs of bringing in and out other mixing equipment and other machinery, thus significantly lowering construction costs.

[0046] Simultaneously, slurry and high-pressure gas are delivered to the mixing drill bit 400, and then sprayed out through the air outlet 401 and slurry outlet 402 respectively. The drill bit blades 410 and drill rod blades 310 cut and mix the mud and slag and solidify the slurry. The compressed air delivered into the mud and slag has a lower density than the mud, so it rises in the mud. Through a series of tumbling, rising, rotating and convection actions, the solidified slurry reacts fully with the mud and slag, so that the mud and slag can be solidified quickly and reach the strength of the original soil in a short time, thereby ensuring the normal operation of the mechanical equipment on the construction site.

[0047] Furthermore, by movably connecting the hollow cylinder 500 to the lower outer periphery of the mixing drill rod 300, the drill rod blades 310 and drill bit blades 410 are effectively prevented from being stirred against the borehole wall. Because the hollow cylinder 500 is movably connected, it is in a free state when the mixing drill rod 300 rotates; therefore, the hollow cylinder 500 prevents the solidified slurry from rotating freely with the rotation of the drill bit blades 410 and drill rod blades 310, ensuring that the solidified slurry and slag mud are mixed more evenly.

[0048] (1) Composition of the curing slurry:

[0049] The curing slurry is prepared by mixing a curing agent with water. According to the weight ratio, the curing agent includes 10-35 parts cement clinker, 5-20 parts quicklime, 20-50 parts slag powder, 10-20 parts fly ash, 5-20 parts desulfurized gypsum, 0.8-1.5 parts sodium sulfate, and 1-5 parts high-efficiency water-reducing agent. Thus, all components used in this curing slurry are commercially available products or industrial emissions, resulting in low production costs. Furthermore, the amount of the solidified body incorporated is small, leading to high strength, minimal shrinkage, and rapid setting time.

[0050] (2) Curing principle:

[0051] The cement clinker is ordinary Portland cement clinker with a strength of not less than 42.5 MPa and a specific surface area ≥ 400 m². 2 / kg; the calcium oxide (CaO) content in the quicklime is above 90%; the slag powder is S95 grade slag powder, which is mineral waste slag that has been calcined at high temperature, and its specific surface area is ≥400m². 2 / kg, exhibiting high activity; the fly ash used is Grade I fly ash, with a calcium oxide (CaO) content of 5-10%; the desulfurized gypsum is anhydrite, with a calcium sulfate (CaSO4) content ≥90% and a specific surface area ≥300m². 2 / kg, in dry powder form.

[0052] When silicate cement clinker is added to slurry, due to the high water content of the slurry and the flaky nature of the montmorillonite mineral particles, physical and chemical hydrolysis and hydration reactions occur with the silicate cement clinker. Although a partial skeleton is formed, the flaky montmorillonite mineral particles are too small, resulting in a large number of voids in the polymer skeleton, which need to be filled by other materials.

[0053] Fly ash contains a large amount of active SiO2, Al2O3, Fe2O3, etc., making it acidic. This acidity can neutralize alkaline mud and slag, allowing for a more complete reaction between cement and alkaline mud and slag. Furthermore, due to its fine particle size, fly ash effectively fills the voids formed between cement and montmorillonite minerals, further improving the strength of the cement-soil mixture.

[0054] Quicklime is primarily used to absorb water, reducing the moisture content of mud from over 120% to 60-80%, which significantly reduces the amount of cement and fly ash required. Simultaneously, when lime is mixed with soil, a pozzolanic reaction occurs. This reaction causes the active silica minerals in the soil to form hydrated calcium aluminate and calcium silicate cements under the alkaline activation of the lime, further increasing the strength and stiffness of the reinforced soil.

[0055] Slag powder is a waste residue produced through high-temperature calcination. It possesses high activity, especially when finely ground alone, which significantly increases its hydration activity. While slag powder reacts generally with soil particles on its own, the addition of alkaline materials like gypsum, acting as an alkaline activator, allows it to chemically react with SiO2 in the soil to form calcium silicate hydrate (CSH). CSH can bind unreacted particles, causing them to agglomerate, deposit, and gradually harden, eventually transforming into a brittle, hardened mass.

[0056] Desulfurized gypsum is alkaline. When used as an alkaline activator, it reacts with fine soil particles together with slag powder. This not only accelerates the reaction between slag powder and soil particles, but also has the dual function of cementing soil particles and expanding to fill pores.

[0057] When used for solidification treatment of mud and slag, the added powder is 15-25% of the mud weight, which greatly reduces the amount of solidifier compared to the 30-45% addition of ordinary cement. The silicate cement clinker in the solidifier reacts with the montmorillonite minerals in the mud to form a skeleton. Under the activation of alkaline gypsum, the activity of the mineral powder is greatly increased, and it also forms agglomerates with montmorillonite and other minerals in the mud. Fly ash fills the gaps between the agglomerates and the skeleton, while quicklime reduces the water content of the mud and, on the other hand, reacts with soil particles to form calcium aluminate and calcium silicate cementing materials, which further improve the strength.

[0058] In this embodiment, the outer periphery of the stirring drill bit 400 is provided with multiple slurry outlets 402 and multiple air outlets 401. Along the circumference of the stirring drill bit 400, the multiple slurry outlets 402 and multiple air outlets 401 are arranged in a staggered sequence. In this way, the slurry is solidified by the turbulence, rise, and rotation of high-pressure gas, making the solidified slurry and mud and soil more uniformly mixed.

[0059] Specifically, along the axial direction of the mixing drill bit 400, adjacent slurry outlets 402 and air outlets 401 are arranged in a staggered vertical position; along the axial direction of the mixing drill bit 400, the air outlet 401 extends vertically in a flat strip shape, and along the circumference of the mixing drill bit 400, the slurry outlet extends circumferentially in a flat strip shape. This makes the mixing more uniform.

[0060] An inclined ring 440 is provided on the outer periphery of the mixing drill bit 400. The inclined ring 440 is located above the drill bit blade 410, the slurry outlet 402, and the air outlet 401, and is arranged around the outer periphery of the mixing drill bit 400. The inner end of the inclined ring 440 is connected to the outer periphery of the mixing drill bit 400, and the outer end of the inclined ring 440 is inclined downward away from the mixing drill bit 400. The inclined ring 440 has multiple through holes 403 extending vertically. In this way, the inclined ring 440 can be regarded as a flange, and the mixing drill bit 400 is fixed to the bottom of the mixing drill rod 300 by inserting anchor bolts in the through holes 403.

[0061] An upper shaft 210 is hinged to the swing arm 110, and an upper seat 220 is connected to the upper shaft 210. The swing arm 110 is hinged to the middle of the upper shaft 210, and the upper seat 220 is located below the upper shaft 210 and is hinged to both ends of the upper shaft 210.

[0062] The upper seat 220 is movably connected to the lower shaft 230, and the middle part of the lower shaft 230 is hinged to the upper seat 220. The power head 200 is provided with a rotatably arranged lower seat 240, which is hinged to both ends of the lower seat 240. The upper shaft 210 and the lower shaft 230 are arranged perpendicularly to each other.

[0063] As the swing arm 110 swings up and down, the hinged linkage between the upper shaft 210, upper seat 220, lower shaft 230, and lower seat 240 restricts the swing of the mixing drill rod 300 and guides the mixing drill rod 300 to move up and down in the empty pile section. In this way, it is ensured that when the excavator 100 swing arm 110 is raised, the mixing drill rod 300 can be adjusted in any direction to maintain a vertical state.

[0064] The stirring drill rod 300 is hollow and has a rod cavity extending axially from it. The rod cavity contains a slurry outlet pipe 41 and an air outlet pipe 31. The upper end of the slurry outlet pipe 41 is connected to the grouting pump 40, and the lower end is connected to the slurry outlet 402. The upper end of the air outlet pipe 31 is connected to the air compressor 30, and the lower end is connected to the air outlet 401. Thus, the slurry outlet pipe 41 transports the solidified slurry, and the air outlet pipe 31 transports high-pressure gas, achieving both slurry and gas discharge.

[0065] The bottom of the stirring drill bit 400 is provided with a longitudinally arranged guide plate 420. Along the top-to-bottom direction of the guide plate 420, the two sides of the guide plate 420 are arranged inwardly. The bottom of the guide plate 420 is provided with multiple guide conical teeth 430, which are spaced apart along the length of the guide plate 420. The vertical orientation is ensured by the action of the guide plate 420 and the guide conical teeth 430.

[0066] In this embodiment, fan plates 421 are provided on both sides of the guide plate 420. The upper end of the fan plate 421 is hinged to the side of the guide plate 420, and the lower end of the fan plate 421 extends downward and is inclined outward away from the guide plate 420. A return spring 441 is provided between the fan plate 421 and the guide plate 420. The two ends of the return spring 441 are respectively connected to the fan plate 421 and the guide plate 420.

[0067] During the mixing process of the mixing drill bit 400 in the empty pile section, the two fan plates 421 oscillate relative to or away from each other as the rotation speed changes, mixing the mud, slag, and solidified slurry around the mixing drill bit 400. The return spring 441 causes the two fan plates 421 to oscillate repeatedly relative to or away from each other, ensuring continuous mixing of the mud, slag, and solidified slurry around the mixing drill bit 400.

[0068] Specifically, the top and bottom of the hollow cylinder 500 are respectively provided with horizontally arranged frames 520, the two horizontal frames 520 are arranged vertically and alternately, and the lower section passes through the middle of the two horizontal frames 520 and is rotatably connected to the horizontal frames 520.

[0069] The horizontal frame 520 has multiple hollow areas that run vertically through it, and the hollow areas connect to the stirring area; the outer periphery of the hollow cylinder 500 has multiple longitudinal strips 510, which are arranged at intervals along the circumference of the lower section. The multiple longitudinal strips 510 and the lower section enclose the stirring area, and the adjacent longitudinal strips 510 form an outer periphery opening.

[0070] Multiple longitudinal strips 510 are located between two horizontal frames 520, with the two ends of each longitudinal strip 510 corresponding to the outer periphery of the two horizontal frames 520. In this way, the multiple longitudinal strips 510 and the horizontal frames 520 enclose and form a hollow cylinder 500 with multiple circumferential intervals.

[0071] In this embodiment, longitudinally arranged oscillating plates 530 are respectively provided on both sides of the longitudinal strip 510. The inner end of the oscillating plate 530 is hinged to the longitudinal strip 510 through the hinge shaft 531. The outer end of the oscillating plate 530 extends towards the middle of the stirring interval. The outer ends of two adjacent oscillating plates 530 are staggered towards each other. A driving torsion spring 532 is sleeved on the hinge shaft 531. When the oscillating plate 530 is in a free state, the oscillating plate 530 is located in the stirring interval.

[0072] During the mixing process of the mixing drill bit 400 in the empty pile section, the hollow cylinder 500 is in a free state and rotates freely under the pressure of mud and soil. The swing plate 530 swings back and forth under the pressure of mud and soil and the restoring force of the drive torsion spring 532, and simultaneously mixes the mud, soil and solidified slurry.

[0073] The design of the oscillating plate 530 allows for uniform mixing of mud, slag, and solidified slurry in the mixing interval. This is not limited to the installation method shown in the figure below. As can be seen from the installation method shown in the figure below, a drive torsion spring 532 is sleeved on the hinge shaft 531, and both ends of the drive torsion spring 532 extend into the oscillating plate 530, thereby enabling the oscillating plate 530 to oscillate back and forth and ensuring continuous mixing.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixing structure for solidifying mud and slag in the empty pile section of cast-in-place piles, characterized in that, The excavator includes a bucket removal excavator, the excavator includes a movable body and a swing arm connected to the body, a power head is hinged to the swing arm, a mixing drill rod is connected to the power head, and a mixing drill bit is provided at the bottom of the mixing drill rod and rotated synchronously by the mixing drill rod. The lower part of the mixing drill rod has a lower section placed in the empty pile section, and the mixing drill bit is connected to the bottom of the lower section; the outer periphery of the mixing drill bit is provided with a plurality of drill bit blades, and the plurality of drill bit blades are arranged at intervals along the circumference of the mixing drill bit; the outer periphery of the lower section is provided with a plurality of drill rod blades, and the plurality of drill rod blades are arranged at intervals along the circumference and axial direction of the lower section. The outer periphery of the stirring drill bit is provided with a slurry outlet for spraying solidified slurry and a high-pressure gas outlet for spraying gas; a hollow cylinder is movably fitted around the outer periphery of the lower section, the hollow cylinder is movably connected to the lower section, and the hollow cylinder and the lower section enclose a stirring area, in which multiple drill rod blades are located; the outer periphery of the hollow cylinder is provided with multiple outer periphery openings, which are arranged at intervals along the circumference of the lower section, and the stirring area communicates with the outside through the outer periphery openings; When the lower section and the mixing drill bit are placed in the mud and slag of the empty pile section, the power head drives the mixing drill rod to rotate, the mixing drill bit rotates synchronously, the slurry outlet sprays out solidified slurry, the air outlet sprays out high-pressure gas, the drill rod blades and the drill bit blades mix the mud and slag and solidified slurry synchronously, and the hollow cylinder is in a free state and rotates under the pressure of the mud and slag. The outer periphery of the stirring drill bit is provided with a plurality of slurry outlets and a plurality of air outlets, and the plurality of slurry outlets and the plurality of air outlets are arranged in a staggered manner along the circumference of the stirring drill bit. Along the axial direction of the stirring drill bit, adjacent slurry outlets and air outlets are arranged vertically and vertically in a staggered manner; along the axial direction of the stirring drill bit, the air outlet extends vertically and vertically in a flat strip shape, and along the circumference of the stirring drill bit, the slurry outlet extends circumferentially in a flat strip shape. The bottom of the stirring drill bit is provided with a longitudinally arranged guide plate. Along the top-to-bottom direction of the guide plate, the two sides of the guide plate are arranged inwardly. The bottom of the guide plate is provided with multiple guide cone teeth, which are spaced apart along the length of the guide plate. The guide plate has fan-shaped plates on both sides. The upper end of the fan-shaped plate is hinged to the side of the guide plate, and the lower end of the fan-shaped plate extends downward and is inclined outward away from the guide plate. A return spring is provided between the fan-shaped plate and the guide plate, and the two ends of the return spring are respectively connected to the fan-shaped plate and the guide plate. During the mixing process in the empty pile section, as the rotation speed changes, the two fan-shaped plates swing relative to or away from each other, mixing the mud, slag, and solidified slurry around the mixing drill bit. The top and bottom of the hollow cylinder are respectively provided with horizontally arranged frames, and the two horizontal frames are arranged vertically at intervals. The lower section passes through the middle of the two horizontal frames and is rotatably connected to the horizontal frames. The horizontal frame has multiple through-hole areas that connect to the stirring area; the outer periphery of the hollow cylinder has multiple longitudinal strips that are spaced apart along the circumference of the lower section, and the stirring area is formed by the longitudinal strips and the lower section, with the outer periphery openings formed between adjacent longitudinal strips. The longitudinal strips are located between two horizontal frames, and the two ends of the longitudinal strips are respectively connected to the outer periphery of the two horizontal frames; The longitudinal strip has longitudinally arranged oscillating blades on both sides. The inner end of the oscillating blade is hinged to the longitudinal strip through a hinge shaft. The outer end of the oscillating blade extends toward the middle of the stirring interval. The outer ends of two adjacent oscillating blades are staggered towards each other. A driving torsion spring is sleeved on the hinge shaft. When the oscillating blade is in a free state, the oscillating blade is located in the stirring interval. During the mixing process in the empty pile section, the hollow cylinder is in a free state and rotates freely under the pressure of mud and slag. The swing plate swings back and forth under the pressure of mud and slag and the restoring force of the driving torsion spring, and simultaneously mixes the mud, slag and solidified slurry.

2. The mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile as described in claim 1, characterized in that, The outer periphery of the stirring drill bit is provided with an inclined ring, which is located above the drill bit blades, the slurry outlet and the air outlet, and is arranged around the outer periphery of the stirring drill bit; the inner end of the inclined ring is connected to the outer periphery of the stirring drill bit, and the outer end of the inclined ring is inclined downward away from the stirring drill bit; the inclined ring is provided with multiple through holes running vertically through it.

3. The mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile as described in claim 1, characterized in that, The swing arm is hinged to an upper shaft, and an upper seat is connected to the upper shaft. The swing arm is hinged to the middle of the upper shaft, and the upper seat is located below the upper shaft and is hinged to both ends of the upper shaft. The upper seat is movably connected to the lower shaft, the middle part of the lower shaft is hinged to the upper seat, the power head is provided with a rotatably arranged lower seat, the lower seat is hinged to both ends of the lower seat, and the upper shaft and the lower shaft are arranged perpendicularly to each other. As the swing arm swings up and down, the hinged linkage between the upper shaft, upper seat, lower shaft, and lower seat restricts the swing of the mixing drill rod and guides the mixing drill rod to move up and down in the empty pile section.

4. The mixing structure for solidifying mud and slag in the empty pile section of a cast-in-place pile as described in claim 1, characterized in that, The stirring drill rod is hollow and has a rod cavity extending axially from the stirring drill rod. The rod cavity is provided with a slurry outlet pipe and an air outlet pipe. The upper end of the slurry outlet pipe is connected to the grouting pump, and the lower end of the slurry outlet pipe is connected to the slurry outlet. The upper end of the air outlet pipe is connected to the air compressor, and the lower end of the air outlet pipe is connected to the air outlet.

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