A construction device and method for arc-shaped progressive trenching and soil extraction.

Abstract

This invention relates to the field of geotechnical engineering pile foundation equipment, and more particularly to a construction device and method for arc-shaped progressive trenching and soil extraction. The device includes an arc-shaped excavating roller mechanism, a coaxially arranged double-layer casing wall mechanism, and a soil conveying mechanism. The inlet end of the soil conveying mechanism is connected to the tail end of the arc-shaped excavating roller mechanism for conveying the excavated soil to the surface. The arc-shaped excavating roller mechanism is coaxially arranged within the construction cavity between the inner and outer sleeves of the double-layer casing wall mechanism. The double-layer casing wall mechanism and the arc-shaped excavating roller mechanism of this invention are used together to adapt to different soil types, such as loose soil and dense soil, overcoming the limitation of traditional equipment in adapting to only one soil type. The double-layer casing wall system forms a closed annular construction space, avoiding problems such as borehole wall collapse and soil leakage during excavation, thus improving the stability of deep construction.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering pile foundation equipment, and in particular to a construction device and method for arc-shaped progressive trenching and soil extraction. Background Technology

[0002] PCC piles (cast-in-place concrete large-diameter pipe piles) in geotechnical engineering are widely used in foundation reinforcement for various projects such as highways, railways, and ports due to their significant advantages, including high bearing capacity, small settlement deformation, good economy, energy saving, and emission reduction. As engineering construction expands into the complex soil layers of central and western China, the soil conditions are becoming increasingly diverse. The emergence of complex mixed soil layers such as sand, silty clay, and backfill soil places higher demands on the adaptability of PCC pile construction equipment and the quality of construction.

[0003] Current traditional PCC pile construction equipment and methods still have many technical shortcomings, making it difficult to meet the construction needs under complex working conditions. Traditional PCC pile construction equipment often uses a vibratory hammer to generate high-frequency vibration force to drive the inner and outer double-layer casings of a closed valve pile shoe to sink simultaneously, compressing the soil. Concrete is then poured into the annular cavity within the inner and outer double-layer casings of the closed valve pile shoe. The valve pile shoe is then released, and the inner and outer double-layer casings are vibrated and pulled up to form the PCC pile. This construction method suffers from poor soil adaptability, a single soil breaking method, a lack of targeted soil breaking design, high resistance during vibration sinking in dense soil layers, and an inability to flexibly adapt to soil layers with different physical properties.

[0004] In addition, traditional trenching machinery can only be used for excavating straight trenches and cannot excavate annular pile holes.

[0005] Therefore, existing technologies need to be improved. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a construction device and method for arc-shaped progressive trenching and soil extraction, which aims to solve the problem that current PCC piles cannot effectively excavate ring pile holes for various complex soil layers.

[0007] In a first aspect, the present invention provides a construction device for arc-shaped progressive trenching and soil extraction, comprising:

[0008] Arc-shaped excavating roller mechanism

[0009] A coaxially arranged double-layer sleeve wall protection mechanism is used to form an annular construction space and provide guidance and wall protection for the arc-shaped excavating roller mechanism;

[0010] A soil conveying mechanism, wherein the inlet end of the soil conveying mechanism is connected to the tail end of the arc-shaped excavating roller mechanism, is used to convey the excavated soil to the ground.

[0011] A power mechanism, connected to the arc-shaped excavating drum mechanism, is used to drive the arc-shaped excavating drum mechanism to perform rotational excavation and angle adjustment;

[0012] The arc-shaped excavating roller mechanism is coaxially disposed between the inner sleeve and the outer sleeve of the double-layer sleeve wall protection mechanism.

[0013] Optionally, the arc-shaped excavating roller mechanism can be adjusted between a horizontal state and an inclined state of up to 30 degrees relative to the horizontal plane. This facilitates the implementation of progressive, layered excavation.

[0014] Optionally, the arc-shaped excavating roller mechanism includes an arc-shaped support I and an arc-shaped support II arranged concentrically, and a plurality of excavating roller units disposed between the two.

[0015] Optionally, the excavating drum unit includes a drive shaft and a hollow conical drum coaxially disposed outside the drive shaft, wherein the hollow conical drum is smaller in the middle and larger on the outer perimeter along the radial direction of the double-layer sleeve wall protection mechanism.

[0016] Optionally, one end of the drive shaft is provided with a double row of sprockets, and the arc-shaped digging roller mechanism also includes multiple chains connected between the sprockets of two adjacent drive shafts.

[0017] Optionally, the excavating drum unit further includes an advanced soil-breaking structure disposed on the outer peripheral surface of the hollow conical drum.

[0018] Optionally, the arc length of the arc-shaped excavating roller mechanism is one-fifth to one-quarter of the circumference of the ring it is in, and the maximum excavation depth in one go is one-quarter to one-third of the outer diameter of the outer sleeve of the double-layer casing wall mechanism.

[0019] Optionally, the soil conveying mechanism includes a longitudinal conveying pipe and a transverse conveying pipe; the bottom end of the longitudinal conveying pipe is connected to the tail end of the arc-shaped excavating roller mechanism, and the top end is connected through the transverse conveying pipe; both the longitudinal conveying pipe and the transverse conveying pipe are equipped with a spiral conveying mechanism.

[0020] Optionally, there are six longitudinal conveying pipes, three of which are connected at their bottom ends to the arc-shaped excavating roller mechanism; there are two transverse conveying pipes, which intersect and are symmetrically connected to the longitudinal conveying pipes to form a conveying network.

[0021] Optionally, the double-layer casing wall protection mechanism includes an inner sleeve and an outer sleeve that can be independently pressed into the foundation, forming an annular construction cavity between them to accommodate the arc-shaped excavating roller mechanism.

[0022] Secondly, the present invention provides a construction method for arc-shaped progressive layered trenching and soil extraction, comprising the following steps:

[0023] S1. First, press the double-layer casing wall protection mechanism into the foundation where the trench is to be dug and the soil is to be extracted;

[0024] S2. Drive the arc-shaped excavating roller mechanism to tilt from a horizontal state to a digging angle, cut into the soil layer of the annular construction cavity of the double-layer casing wall mechanism, and dig laterally until its arc length path is completely cut.

[0025] S3. Return the arc-shaped excavating roller mechanism to a horizontal state, drive the arc-shaped excavating roller mechanism to rotate one revolution along the double-layer sleeve wall mechanism, cut out a layer of annular soil, and at the same time discharge the soil to the ground through the soil conveying mechanism to form an annular pile hole.

[0026] It should be noted that steps S2 and S3 can be repeated to excavate the next layer until the design depth is approached. During the final layer excavation, the inclination angle of the arc-shaped excavating roller mechanism is adjusted to accommodate the remaining soil layer height, completing the final excavation and forming a ring-shaped pile hole. Finally, concrete is poured into the formed ring-shaped pile hole to form a PCC pile.

[0027] Beneficial Effects: This invention provides a construction device and method for arc-shaped progressive trenching and soil extraction. The double-layer casing wall mechanism and arc-shaped excavating roller mechanism of this invention are used in conjunction, adaptable to different soil types such as loose soil and dense soil, overcoming the limitation of traditional equipment in adapting to only one soil type. The double-layer casing wall system forms a closed annular construction space, effectively isolating external soil and preventing problems such as borehole wall collapse and soil leakage during excavation, significantly improving the stability of deep construction. The fitted design of the inner and outer sleeves provides precise construction guidance for the arc-shaped excavating roller system, further ensuring construction safety.

[0028] The arc-shaped excavating roller mechanism of the present invention can adopt a progressive layered excavation mode, advancing construction layer by layer. The arc length of the transverse trench is precisely matched with the overall arc length of the arc-shaped excavating roller mechanism. After rotating and excavating for one revolution, a regular annular soil layer space can be formed, effectively controlling the dimensional deviation of the annular cavity of the PCC pile and significantly improving the quality of pile foundation forming.

[0029] This invention, combined with the rotating excavation and precise adjustment of the arc-shaped excavating drum mechanism, significantly improves construction efficiency. The well-designed structure of each mechanism facilitates the integration of automated control modules, laying the foundation for intelligent monitoring and control of the construction process, reducing reliance on manual labor, and improving the level of construction standardization. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an arc-shaped excavating roller mechanism and a double-layer casing wall protection mechanism according to one embodiment.

[0031] Figure 2This is a schematic diagram of the construction state of an arc-shaped excavating roller mechanism and a double-layer casing wall protection mechanism according to one embodiment.

[0032] Figure 3 This is a schematic diagram of the structure of a soil conveying mechanism according to one embodiment.

[0033] Figure 4 This is a schematic diagram of the structure of an arc-shaped excavating roller mechanism according to one embodiment.

[0034] Figure 5 This is a schematic diagram of the structure of a digging roller unit according to one embodiment.

[0035] Figure 6 This is a reference diagram showing the usage state of one embodiment. Detailed Implementation

[0036] This invention provides a construction device and method for arc-shaped progressive trenching and soil extraction. To make the objectives, technical solutions, and advantages of the embodiments of this invention clearer, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this invention and are not intended to limit the embodiments of this invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0037] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0038] Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] Based on existing technologies, a new type of PCC pile construction equipment and method that combines adaptability, precision and efficiency is needed to address the pain points of traditional PCC piles, which has become an urgent need for the development of current geotechnical engineering pile foundation construction technology.

[0040] Based on this, this embodiment provides a construction device for arc-shaped progressive trenching and soil extraction, such as... Figure 1 , Figure 2 , Figure 3 , Figure 6As shown, it includes:

[0041] Arc-shaped excavating roller mechanism 1,

[0042] The coaxially arranged double-layer sleeve wall protection mechanism 2 is used to form an annular construction space and provide guidance and wall protection for the arc-shaped excavating roller mechanism 1;

[0043] Soil conveying mechanism 3, the inlet end of which is connected to the tail end of the arc-shaped excavating roller mechanism 1, is used to convey the excavated soil to the ground.

[0044] A power mechanism is connected to the arc-shaped excavating drum mechanism 1 and is used to drive the arc-shaped excavating drum mechanism 1 to perform rotational excavation and angle adjustment.

[0045] The arc-shaped excavating roller mechanism 1 is coaxially disposed between the inner sleeve and the outer sleeve of the double-layer sleeve wall protection mechanism 2.

[0046] It should be noted that the arc-shaped excavating drum mechanism in this embodiment, driven by a power mechanism, rotates and cuts the soil along a set trajectory. Its "arc" design causes the excavation face to unfold in a curved manner, gradually forming a smooth, continuous annular trench, adapting to the annular cavity shape required for PCC piles. The excavation angle is adjustable, facilitating adaptation to different soil layers and pile diameter requirements. The double-layer casing wall mechanism presses down synchronously during excavation, forming a stable annular construction space between the outer and inner casings. This structure not only effectively isolates the surrounding soil and prevents borehole collapse but also provides precise radial and axial guidance for the excavating drum, ensuring the verticality and concentricity of the pile path. The excavated soil is transported to the surface in real time via a conveying mechanism (such as a screw conveyor or mud pump pipe) connected to the tail end of the drum. This achieves simultaneous excavation and soil removal, avoiding the interruptions of repeated drilling and slag removal in traditional processes, and ensuring the continuity of construction. The power mechanism can adjust the drum speed, torque, and inclination angle in real time based on soil resistance and tunneling feedback, thus flexibly responding to different geological conditions such as soft soil, clay, and sand layers, achieving adaptive construction through "sensing-adjustment-optimization." Therefore, this embodiment results in high-quality piles with excellent geometric accuracy. The arc-shaped tunneling combined with casing guidance forms a continuous and smooth arc-shaped pile wall, significantly improving the overall integrity of the pile and the concrete bond strength. The double-layer casing effectively prevents borehole collapse and necking, and the pile diameter and verticality are highly controllable, making it particularly suitable for deep piles and complex strata. Construction efficiency is greatly improved, with integrated continuous operation of tunneling, soil extraction, and casing protection, reducing process transitions and downtime in traditional methods. Immediate soil delivery avoids sediment accumulation at the bottom of the borehole, reduces the need for secondary borehole cleaning, and shortens the pile formation cycle. With minimal environmental impact and safe construction, the closed-loop tunneling and soil removal system reduces mud spillage and soil scattering, minimizing pollution to the construction site and surrounding environment. The casing wall significantly reduces ground disturbance, ensuring controllable impact on adjacent buildings and underground pipelines, making it suitable for urban areas and sensitive environments. The modular design allows for adjustments to tunneling parameters and drum configuration based on geological conditions, demonstrating outstanding ability to handle complex strata. Continuous cutting and efficient soil removal reduce mechanical idling and repetitive actions, thus lowering energy consumption. Therefore, this arc-shaped progressive trenching and soil removal construction device, through structural innovation and process integration, fundamentally improves upon the common problems of low efficiency, poor accuracy, and significant environmental impact in traditional PCC pile construction. Its "arc-shaped tunneling + synchronous casing + continuous soil removal" operation mode embodies a deep integration of adaptability, precision, and efficiency. It is not only suitable for conventional PCC pile construction but also provides a new technical path for pile foundation engineering under irregular pile, inclined pile, and complex strata conditions, possessing significant value for widespread application.

[0047] In one embodiment, the arc-shaped excavating roller mechanism 1 is adjustable between a horizontal state and an inclined state of up to 30 degrees relative to the horizontal plane. This facilitates progressive, layered excavation.

[0048] It should be noted that the power mechanism can precisely adjust the construction inclination angle according to specific construction conditions, or coarsely adjust the inclination angle and tunneling pressure in three ranges: hard soil, conventional soil, and soft soil, achieving rapid control. If tunneling encounters hard soil, the angle can be precisely adjusted to a smaller value, increasing the tunneling pressure, or a rapid coarse adjustment can be made to select the minimum inclination angle (level 1) and maximum pressure (level 3) for rapid excavation. If tunneling encounters soft soil, the angle can be adjusted to a larger value, reducing the tunneling pressure, or a rapid coarse adjustment can be made to select the maximum inclination angle (level 3) and minimum pressure (level 1) for rapid excavation while reducing energy consumption. If tunneling encounters conventional soil, a moderate angle and moderate tunneling pressure can be precisely adjusted, or a rapid coarse adjustment can be made to select the moderate inclination angle and moderate pressure (level 2) for rapid excavation.

[0049] In one implementation, such as Figure 4 As shown, the arc-shaped excavating roller mechanism 1 includes an arc-shaped support 1-1 and an arc-shaped support 1-2 arranged concentrically, and a plurality of excavating roller units 1-3 disposed between the two.

[0050] In this embodiment, two concentric arc-shaped supports constitute the main load-bearing frame of the entire arc-shaped excavating drum mechanism 1. They not only provide precise installation and positioning references for all excavating drum units, but more importantly, form a high-rigidity arc-shaped beam structure. When excavating in non-uniform strata, this structure can effectively resist the lateral torsional forces caused by the uneven hardness of the soil layers, ensuring the geometric accuracy and operational stability of the entire excavation arc surface, which is the foundation for achieving precise hole formation. The excavating drum units adopt a modular design. Each excavating drum unit can be installed, disassembled, and maintained independently. If a unit is damaged or the cutter type needs to be changed for a specific stratum, a single module can be quickly replaced, greatly improving the maintainability and adaptability of the equipment and reducing downtime.

[0051] In one implementation, such as Figure 4 As shown, the excavating drum unit 1-3 includes a drive shaft 1-3-1 and a hollow conical drum 1-3-2 coaxially disposed outside the drive shaft 1-3-1. The hollow conical drum 1-3-2 is smaller in the middle and larger on the outer perimeter in the radial direction of the double-layer sleeve wall protection mechanism 2.

[0052] In this embodiment, the conical drum's "smaller in the middle and larger at the outer perimeter" shape perfectly matches its combined motion of revolving around a center and rotating within the annular cavity. During tunneling, the linear velocity of the outer edge of the drum is greater than that of the inner edge. The outer edge is responsible for the main cutting edge and requires a higher cutting speed; the inner edge focuses more on trimming the already formed arc surface and guiding the soil to the conveying mechanism. The conical structure naturally creates this velocity gradient, optimizing cutting efficiency.

[0053] In one implementation, such as Figure 4As shown, one end of the drive shaft 1-3-1 is provided with a double row of sprockets 1-3-4, and the arc-shaped digging roller mechanism 1 also includes multiple chains 1-4 connected between the sprockets of two adjacent drive shafts 1-3-1.

[0054] In this embodiment, a chain connects the sprockets of all drum units, forming a closed chain drive system. This ensures that the rotation of all excavating drums is strictly synchronized, avoiding uneven cutting, soil blockage, or mechanism jamming caused by slippage or speed differences in individual drums. The double-row sprocket design enhances the smoothness of the transmission and its load-bearing capacity. The entire arc-shaped mechanism may only require one or a few hydraulic motors or electric motors as the main power source, distributing power evenly and reliably to each cutting point through this chain drive network. This design simplifies the layout of the power system and improves reliability.

[0055] In one implementation, such as Figure 5 As shown, the excavating drum unit 1-3 also includes an advanced soil-breaking structure 1-3-3 disposed on the outer peripheral surface of the hollow conical drum 1-3-2.

[0056] In this embodiment, the advanced soil-breaking structure 1-3-3 acts as a "pioneer," pre-breaking, chiseling, or loosening hard soil, gravel, thin rock layers, or cemented layers before the main drum body cuts. These "pioneer" structures withstand the most severe impacts and wear, allowing the subsequent conical drum body to more smoothly strip and transport large volumes of soil, effectively protecting the main cutting surface, extending the overall lifespan, and significantly improving the equipment's ability to tackle complex geological formations and its adaptability.

[0057] In one embodiment, the arc length of the arc-shaped excavating roller mechanism 1 is one-fifth to one-quarter of the circumference of the ring it is in, and the maximum excavation depth in one go is one-quarter to one-third of the outer diameter of the outer sleeve of the double-layer casing wall protection mechanism 2.

[0058] The arc length of the arc-shaped excavating roller mechanism 1 is equal to the circumference of the ring it is in. It can adjust the arc length, angle, and excavation depth according to the actual designed construction pile diameter, wall thickness, and pile length to achieve maximum excavation efficiency.

[0059] In this embodiment, the quarter-circle arc (i.e., the 90° arc segment) can form a sufficiently large, continuous, and stable cutting arc surface within the annular space. This ensures that a smooth and continuous borehole wall is formed with each excavation, which is crucial for controlling the roundness of the pile hole. Simultaneously, the longer arc surface provides a larger load-bearing foundation, making the mechanism operate more smoothly. Reasonable size and flexibility: This length avoids the enormous volume, weight, and drive power requirements associated with using semi-circular or full-circular structures. It makes the mechanism relatively compact, facilitating arrangement and angle adjustment within the annular gap of the double-layer casing. It also reserves space for possible more advanced control strategies such as "multi-segment staggered-phase combined excavation." Therefore, it can achieve maximum excavation efficiency by adjusting the arc length, angle, and excavation depth according to the actual designed pile diameter, wall thickness, pile length, and excavation depth.

[0060] In one implementation, such as Figure 3 As shown, the soil conveying mechanism 3 includes a longitudinal conveying pipe 3-1 and a transverse conveying pipe 3-2; the bottom end of the longitudinal conveying pipe 3-1 is connected to the tail end of the arc-shaped excavating roller mechanism 1, and the top end is connected through the transverse conveying pipe 3-2; both the longitudinal conveying pipe 3-1 and the transverse conveying pipe 3-2 are equipped with a spiral conveying mechanism.

[0061] In this embodiment, the soil conveying path is clearly divided into a "vertical lifting section" (longitudinal pipe) and a "horizontal transfer section" (transverse pipe). The screw conveyor mechanism is particularly suitable for these two working conditions: it can effectively overcome gravity to push the soil upward in the longitudinal pipe; and it can smoothly collect and transport the soil to the designated unloading point in the transverse pipe. This segmented, dedicated pipe design makes the conveying efficiency much higher than that of a single complex path.

[0062] In one embodiment, there are six longitudinal conveying pipes 3-1, three of which are connected at their bottom ends to the arc-shaped excavating roller mechanism 1; there are two transverse conveying pipes 3-2, which are symmetrically connected to the longitudinal conveying pipes 3-1 to form a conveying network.

[0063] In this embodiment, six longitudinal conveying pipes (three of which are operational) are symmetrically connected to two transverse conveying pipes, forming a highly symmetrical and balanced fluid conveying network. This ensures that the soil cut from different sections of the arc-shaped excavator drum is collected and lifted evenly and rapidly, avoiding uneven load on the excavator head caused by localized soil accumulation. The symmetrical convergence of the two transverse pipes further balances the flow rate and pressure from each longitudinal pipe, resulting in continuous and stable final soil discharge.

[0064] In one implementation, such as Figure 1 As shown, the double-layer sleeve wall protection mechanism 2 includes an inner sleeve and an outer sleeve that can be independently pressed into the foundation, and an annular construction cavity is formed between the two to accommodate the arc-shaped excavating roller mechanism 1.

[0065] This embodiment also provides a construction method for arc-shaped progressive layered trenching and soil extraction, including the following steps:

[0066] S1. First, press the double-layer sleeve wall protection mechanism 2 into the foundation where the trench is to be dug and the soil is to be extracted;

[0067] S2. Drive the arc-shaped excavating drum mechanism 1 from the horizontal state to an excavation angle, cut into the soil layer of the annular construction cavity of the double-layer casing wall protection mechanism 2, and excavate laterally until its arc length path is completely cut.

[0068] S3. Return the arc-shaped excavating roller mechanism 1 to a horizontal state, drive the arc-shaped excavating roller mechanism 1 to rotate one revolution along the double-layer sleeve wall protection mechanism 2, cut out a layer of annular soil, and at the same time discharge the soil to the ground through the soil conveying mechanism 3 to form an annular pile hole.

[0069] It should be noted that steps S2 and S3 can be repeated to excavate the next layer until the design depth is approached. During the final layer excavation, the inclination angle of the arc-shaped excavating roller mechanism 1 is adjusted to accommodate the remaining soil layer height, completing the final excavation and forming a ring-shaped pile hole. Finally, concrete is poured into the formed ring-shaped pile hole to form a PCC pile.

[0070] In summary, this invention provides a construction device and method for arc-shaped progressive trenching and soil extraction. The double-layer casing wall mechanism and arc-shaped excavating roller mechanism of this invention are used in conjunction, adaptable to different soil types such as loose soil and dense soil, overcoming the limitation of traditional equipment in adapting to only one soil type. The double-layer casing wall system forms a closed annular construction space, effectively isolating external soil and preventing problems such as borehole wall collapse and soil leakage during excavation, significantly improving the stability of deep construction. The fitted design of the inner and outer sleeves provides precise construction guidance for the arc-shaped excavating roller system, further ensuring construction safety.

[0071] The arc-shaped excavating roller mechanism of the present invention can adopt a progressive layered excavation mode, advancing construction layer by layer. The arc length of the transverse trench is precisely matched with the overall arc length of the arc-shaped excavating roller mechanism. After rotating and excavating for one revolution, a regular annular soil layer space can be formed, effectively controlling the dimensional deviation of the annular cavity of the PCC pile and significantly improving the quality of pile foundation forming.

[0072] The rotating excavation and precise adjustment of the arc-shaped excavating drum mechanism in this invention significantly improves construction efficiency. The well-designed structure of each mechanism facilitates the integration of automated control modules, laying the foundation for intelligent monitoring and control of the construction process. This also helps reduce reliance on manual labor and improve the level of construction standardization.

[0073] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A construction device for arc-shaped progressive trenching and soil extraction, characterized in that, include: Arc-shaped excavating roller mechanism (1). The coaxial double-layer sleeve wall protection mechanism (2) is used to form an annular construction cavity and provide guidance and wall protection for the arc-shaped excavating roller mechanism (1); Soil conveying mechanism (3), the inlet end of which is connected to the tail end of the arc-shaped excavating roller mechanism (1), is used to convey the excavated soil to the ground. The power mechanism is connected to the arc-shaped excavating drum mechanism (1) and is used to drive the arc-shaped excavating drum mechanism (1) to perform rotational excavation and angle adjustment; The arc-shaped excavating roller mechanism (1) is coaxially arranged in the construction cavity between the inner sleeve and the outer sleeve of the double-layer sleeve wall protection mechanism (2); The arc-shaped excavating roller mechanism (1) includes an arc-shaped support one (1-1), an arc-shaped support two (1-2) arranged concentrically, and a plurality of excavating roller units (1-3) arranged between the two. The excavating drum unit (1-3) includes a drive shaft (1-3-1) and a hollow conical drum (1-3-2) coaxially disposed outside the drive shaft (1-3-1). The hollow conical drum (1-3-2) is smaller in the middle and larger on the outer periphery in the radial direction of the arc-shaped excavating drum mechanism (1). One end of the drive shaft (1-3-1) is provided with a double row of sprockets (1-3-4), and the arc-shaped digging roller mechanism (1) also includes multiple chains (1-4) connected between the sprockets of two adjacent drive shafts (1-3-1). The excavating drum unit (1-3) also includes an advanced soil-breaking structure (1-3-3) disposed on the outer peripheral surface of the hollow conical drum (1-3-2).

2. The construction device for arc-shaped progressive trenching and soil extraction according to claim 1, characterized in that, The arc-shaped excavating roller mechanism (1) can be adjusted between a horizontal state and an inclined state of up to 30 degrees relative to the horizontal plane.

3. The construction device for arc-shaped progressive trenching and soil extraction according to claim 1, characterized in that, The arc length of the arc-shaped excavating roller mechanism (1) is one-fifth to one-quarter of the circumference of the ring it is in, and the maximum excavation depth in one go is one-quarter to one-third of the outer diameter of the outer sleeve of the double-layer casing wall mechanism (2).

4. The construction device for arc-shaped progressive trenching and soil extraction according to claim 1, characterized in that, The soil conveying mechanism (3) includes a longitudinal conveying pipe (3-1) and a transverse conveying pipe (3-2); the bottom end of the longitudinal conveying pipe (3-1) is connected to the tail end of the arc-shaped digging roller mechanism (1), and the top end is connected through the transverse conveying pipe (3-2); both the longitudinal conveying pipe (3-1) and the transverse conveying pipe (3-2) are equipped with a spiral conveying mechanism.

5. The construction device for arc-shaped progressive trenching and soil extraction according to claim 4, characterized in that, The longitudinal conveying pipes (3-1) consist of six pipes, three of which are connected at their bottom ends to the arc-shaped excavating roller mechanism (1); the transverse conveying pipes (3-2) consist of two pipes, which are symmetrically connected to the longitudinal conveying pipes (3-1) to form a conveying network.

6. A construction method for arc-shaped progressive layered trenching and soil extraction, characterized in that, The construction device for arc-shaped progressive trenching and soil removal according to any one of claims 1-5 includes the following steps: S1. First, press the double-layer sleeve wall protection mechanism (2) into the foundation where the trench is to be dug and the soil is to be extracted; S2, drive the arc-shaped excavating drum mechanism (1) to tilt from the horizontal state to a digging angle, cut into the soil layer of the annular construction cavity of the double-layer casing wall mechanism (2), and dig laterally until its arc length path is completely cut; S3. Restore the arc-shaped excavating roller mechanism (1) to a horizontal state, drive the arc-shaped excavating roller mechanism (1) to rotate one revolution along the double-layer sleeve wall protection mechanism (2) to cut out a layer of annular soil, and at the same time discharge the soil to the ground through the soil conveying mechanism (3) to form an annular pile hole.

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