Open caisson construction excavation equipment

Abstract

The utility model relates to the technical field of open caisson excavation, in particular to open caisson construction excavating equipment which comprises a vehicle body, a walking mechanism is installed at the bottom of the vehicle body, the front end of the vehicle body is connected with a first pitch angle adjusting assembly, the first pitch angle adjusting assembly is connected with a rotary excavating cutter set, and the rear portion of the outer wall of the rotary excavating cutter set is hinged to a first supporting rod. The first supporting rod is hinged to the vehicle body. The rear end of the vehicle body is connected with a second pitch angle adjusting assembly, the second pitch angle adjusting assembly is connected with a push shovel, the rear portion of the outer wall of the push shovel is hinged to a second supporting rod, and the second supporting rod is hinged to the vehicle body. A slurry suction pump is arranged on the vehicle body and located on the rear portion of the rotary excavating cutter set, the slurry suction pump is communicated with a slurry suction pipe and a slurry outlet pipe, the slurry suction pipe downwards extends to the bottom of the vehicle body, and the slurry outlet pipe upwards extends out of a well opening. Water spraying pipes are arranged on the two sides of the vehicle body, the water spraying directions of the water spraying pipes face the front end of the vehicle body, and the water spraying pipes on the two sides of the vehicle body communicate with the water inlet pipe. According to the utility model, workers do not need to go down to the well, the safety risk is reduced, and the equipment cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of caisson excavation technology, specifically to a caisson construction excavation equipment. Background Technology

[0002] A caisson is a widely used construction structure and method in civil engineering. It is typically a well-shaped structure made of materials such as reinforced concrete, brick, or steel. During construction, the caisson is first constructed on the ground, and then excavated or removed from within it, allowing it to gradually sink to the designed depth under its own weight. In the caisson sinking process, the removal of excavated soil from the caisson walls is a crucial step, directly affecting the progress, quality, and safety of the entire project.

[0003] Current construction methods for caisson sinking operations are divided into dewatering sinking and non-dewatering sinking. Dewatering sinking requires setting up dewatering wells around the caisson and using water pumps to lower the water level in the wells below the working surface. Then, construction workers go down into the well and work with excavators to remove earthwork, thereby pushing the caisson down. This method is not only expensive, but also requires extremely high safety management because it involves personnel working in the well, necessitating foolproof safety measures.

[0004] The non-drainage sinking method uses long-arm excavators to excavate on the ground, but its excavation depth is significantly limited by the mechanical performance of these excavators. Furthermore, this method still requires personnel to work in the shaft, resulting in high safety risks and significantly increased safety costs. Additionally, equipment used for underwater excavation of soil in shafts, such as grab buckets and hydraulic suction dredgers, also face problems such as high cost, low excavation efficiency, and significant personnel safety risks. While vertical shield tunneling offers improvements in safety and single-shaft construction efficiency, its high cost and low efficiency when multiple shafts are being constructed simultaneously have led to limited market acceptance. Utility Model Content

[0005] To address the technical problems of high cost of underground construction equipment and the need for workers to go down into the well in existing caisson sinking construction schemes, this utility model provides a caisson construction excavation equipment.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A caisson excavation device includes a vehicle body with a walking mechanism installed at the bottom. The front end of the vehicle body is connected to a pitch angle adjustment component, which is connected to a rotary drilling rig. The rear outer wall of the rotary drilling rig is hinged to a support rod, which is also hinged to the vehicle body. The rear end of the vehicle body is connected to a second pitch angle adjustment component, which is connected to a push blade. The rear outer wall of the push blade is hinged to a second support rod, which is also hinged to the vehicle body. A vertical support is installed on the top of the vehicle body, with a camera and a lighting fixture mounted on the top of the support. Cables and communication lines are installed on the top of the vehicle body, electrically connected to the camera and lighting fixture, and extending upwards out of the wellhead.

[0008] The above structural design uses the vehicle body as the core load-bearing platform, providing the installation foundation for other components and ensuring coordinated operation. The walking mechanism allows the equipment to move flexibly at the bottom of the well. Pitch angle adjustment components one and two control the working angles of the excavating and bulldozing components. The rotary drilling rig is used to break the soil into fine particles, and the pusher is used to collect and stockpile particles and debris. Cameras and lighting enable remote visual monitoring, while cables and communication lines ensure equipment operation and information transmission. This solution solves the technical problems of high equipment cost and the need for workers to enter the well in existing caisson sinking construction schemes. It eliminates the need for workers to enter the well, reducing safety risks and simultaneously lowering equipment costs to some extent.

[0009] As a preferred implementation method for excavation equipment for caisson construction, both pitch adjustment component one and pitch adjustment component two are telescopic structures; one end of pitch adjustment component one is hinged to the top of the vehicle body, and the other end is hinged to the top of the outer wall of the rotary drilling rig; one end of pitch adjustment component two is hinged to the top of the vehicle body, and the other end is hinged to the top of the outer wall of the pusher.

[0010] By employing the above structural design, the pitch adjustment components one and two, through telescopic extension, can change the relative angle between the rotary drilling rig and the pusher blade and the vehicle body. This allows for flexible adjustment of the pitch angle of the rotary drilling rig and the pusher blade to adapt to different construction conditions, improving the efficiency and accuracy of excavation and bulldozing operations. For example, when a larger entry angle of the rotary drilling rig is needed in harder soil layers, the telescopic rod of the pitch adjustment component one can be extended, allowing the rotary drilling rig to cut into the soil at a more vertical angle, enhancing the breaking effect. When adjusting the pusher blade angle is needed for clearing excavated soil, the telescopic rod of the pitch adjustment component two can be adjusted to optimize the pusher blade's shoveling and piling posture. The telescopic pitch adjustment components one and two are simple in structure, highly efficient in operation, have high control precision, and are easy to maintain, greatly improving the equipment's adaptability to complex construction environments.

[0011] As a preferred implementation method for excavation equipment in caisson construction, the driving component of the rotary drilling cutter group is a hydraulic motor. A hydraulic oil pipe is provided on the top of the vehicle body. The hydraulic oil pipe extends upward out of the wellhead and is connected to the hydraulic pump station. The hydraulic oil pipe can deliver hydraulic oil to the hydraulic motor.

[0012] Compared to traditional electric drives, the hydraulically driven rotary drilling cutter group employs the above structural design, offering higher and more stable output torque, easily meeting the breaking requirements of soils with varying hardness. In the underwater environment of caisson construction, the hydraulic system's sealing and waterproofing properties ensure normal operation, preventing short circuits and electrical leaks caused by water immersion in the electric equipment.

[0013] As a preferred implementation of excavation equipment for caisson construction, the traveling mechanism is a tracked structure, and the driving component of the traveling mechanism is a hydraulic motor II. Hydraulic oil pipes can deliver hydraulic oil to the hydraulic motor II. The traveling mechanism is hydraulically driven and can operate underwater.

[0014] The above-described structural design increases the contact area between the equipment and the well bottom surface, effectively reducing the pressure exerted by the equipment on the ground and preventing it from sinking into soft ground. On uneven well bottoms, the tracks adapt to ground undulations, ensuring equipment stability. The hydraulic motor dual-drive system utilizes the smoothness of hydraulic transmission to make the tracks run more smoothly, enabling stepless speed regulation and flexible adjustment of the equipment's travel speed according to construction needs. Simultaneously, the hydraulic drive offers high reliability in underwater environments, ensuring stable movement of the equipment in complex well bottom conditions and providing excellent mobile support for excavation operations.

[0015] As a preferred implementation of excavation equipment for caisson construction, the pitch adjustment component one includes a hydraulic cylinder one, the pitch adjustment component two includes a hydraulic cylinder two, and the hydraulic oil pipe can deliver hydraulic oil to the hydraulic cylinder one and the hydraulic cylinder two.

[0016] With the above structural design, the hydraulic cylinder has a fast response speed and can complete the angle adjustment in a short time, meeting the requirements for rapid operation response during construction, and is also convenient for underwater operations.

[0017] As a preferred implementation of excavation equipment for caisson construction, the vehicle body is equipped with a slurry pump located at the rear of the rotary drilling rig. The slurry pump is connected to a slurry suction pipe and a slurry discharge pipe. The slurry suction pipe extends downward to the bottom of the vehicle body, and the slurry discharge pipe extends upward to the wellhead. Water spray pipes are installed on both sides of the vehicle body, with the water spray direction facing the front of the vehicle body. Both water spray pipes on both sides are connected to a water inlet pipe, which extends upward to the wellhead. The water spray pipes are used to assist in cutting the soil and prevent the rotary drilling rig from damaging the well wall. The slurry suction pipe, slurry pump, and slurry discharge pipe are used to pump fine particles and mud out of the wellhead.

[0018] With the above structural design, the water spray pipe is connected to the water inlet pipe, introducing water from the wellhead with the spray direction facing the front of the vehicle. During rotary drilling rig operation, the high-pressure water jet from the water spray pipe impacts the soil, loosening it beforehand due to the impact force and wetting effect of the water, reducing soil hardness, decreasing the cutting resistance of the rotary drilling rig, and preventing direct collision between the rig and the well wall. This auxiliary cutting method not only improves excavation efficiency but also protects the equipment and well wall structure, ensuring construction safety and project quality. The slurry pump draws in fine particles and mud generated by the rotary drilling rig breaking up the soil through the suction pipe, and then discharges it from the wellhead through the discharge pipe. Simultaneously, the water in the discharged mud, after mud-water separation, can be sent back to the water inlet pipe, achieving water resource recycling.

[0019] As a preferred method for excavation equipment in caisson construction, the grout pump is a hydraulic grout pump, and the hydraulic oil pipe can deliver hydraulic oil to the grout pump.

[0020] Compared with electric slurry pumps, hydraulic drive is not affected by the underwater humid environment and can operate stably. It can also extract fine particles and mud from the bottom of the well more efficiently.

[0021] As a preferred implementation method for excavation equipment in caisson construction, a pipeline fixing beam is installed above the wellhead, and three pipeline fixing pulleys are installed at the bottom of the pipeline fixing beam. The slurry pipe, hydraulic oil pipe, and cable and communication pipelines are respectively routed around the pipeline fixing pulleys, with the hydraulic oil pipe and cable and communication pipelines all routed around the same pipeline fixing pulley. The pipeline fixing pulleys can support the pipelines.

[0022] With the above structural design, the pipeline fixing pulley disperses the weight of the pipeline through contact with the pipeline, thus avoiding damage caused by concentrated stress at the wellhead due to the pipeline's own weight.

[0023] As a preferred implementation method for excavation equipment in caisson construction, the pipeline fixing beam and the pipeline fixing pulley are rotatably connected through a pulley rotation structure, so that the pipeline fixing pulley can rotate around the vertical rotation axis.

[0024] The above-mentioned structural scheme allows the pipeline fixing pulley to rotate around the vertical rotation axis. When the vehicle moves inside the caisson, the pipeline fixing pulley can automatically adjust its angle according to the direction of vehicle movement to deflect, so that the pipeline always stays in a reasonable extension direction, preventing the pipeline from getting tangled, protecting the integrity of the pipeline, extending the service life of the pipeline, and also facilitating the free movement of equipment inside the caisson, thus improving the convenience and efficiency of construction.

[0025] As a preferred method for excavating equipment for caisson construction, a steel wire rope is connected to the top of the vehicle body, which extends upward to the wellhead and connects to the winch.

[0026] The above-mentioned structural design facilitates the lifting and lowering of the vehicle body. Compared with other lifting methods, the combination of winch and wire rope is simple to operate, safe and reliable, and can accurately control the lifting height and speed of the vehicle body, improving the flexibility of equipment operation and construction efficiency, and ensuring the smooth progress of the construction process.

[0027] The beneficial effects of this utility model include:

[0028] It enables unmanned, automated excavation underground, with high excavation efficiency, a wide excavation range, reduced safety risks, and lower equipment costs.

[0029] The equipment adopts a fully hydraulic drive system, which enables it to operate stably underwater, breaking through the application limitations of traditional electric equipment in high-pressure and highly corrosive underwater scenarios. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a caisson construction excavation device located inside a caisson, according to a specific embodiment of this utility model.

[0032] Figure 2 This is a side view of a caisson construction excavation device according to a specific embodiment of the present utility model.

[0033] List of components and reference numerals:

[0034] 1. Vehicle body; 2. Traveling mechanism; 3. Pitch angle adjustment component one; 4. Rotary drilling cutter assembly; 5. Support rod one; 6. Pitch angle adjustment component two; 7. Push blade; 8. Support rod two; 9. Slurry pump; 10. Slurry outlet pipe; 11. Water spray pipe; 12. Water inlet pipe; 13. Hydraulic motor one; 14. Hydraulic oil pipe; 15. Hydraulic pump station; 16. Hydraulic motor two; 17. Support frame; 18. Camera; 19. Lighting lamp; 20. Cable and communication pipeline; 21. Pipeline fixing beam; 22. Pipeline fixing pulley; 23. Pulley rotation structure; 24. Wire rope; 25. Winch; 26. Pipeline conveyor frame. Detailed Implementation

[0035] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. 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.

[0036] Reference Figure 1-2 This embodiment proposes a caisson excavation equipment, including a vehicle body 1. A traveling mechanism 2 is installed at the bottom of the vehicle body 1. Two parallel, vertically arranged supports 17 are installed on the top of the vehicle body 1. Each support 17 has a camera 18 and a lighting lamp 19 installed at its top. A cable and communication pipeline 20 is provided on the top of the vehicle body 1, which is electrically connected to the camera 18 and the lighting lamp 19. The cable and communication pipeline 20 extends upwards out of the well opening. A hydraulic oil pipe 14 is provided on the top of the vehicle body 1, which extends upwards out of the well opening and is connected to a hydraulic pump station 15. A steel wire rope 24 is connected to the top of the vehicle body 1, which extends upwards to the well opening and is connected to a winch 25.

[0037] The vehicle body 1 is equipped with a grout pump 9, which is located at the rear of the rotary drilling cutter group 4. The grout pump 9 is connected to the grout suction pipe and the grout discharge pipe 10. The grout suction pipe extends downward to the bottom of the vehicle body 1, and a grout suction head is connected to the bottom of the grout suction pipe. The grout discharge pipe 10 extends upward to the wellhead. A pipeline conveying frame 26 is provided next to the wellhead to facilitate the conveying of grout through the grout discharge pipe 10.

[0038] Water spray pipes 11 are provided on both sides of the vehicle body 1. The water spray direction of the water spray pipes 11 is towards the front of the vehicle body 1. The water spray pipes 11 on both sides of the vehicle body 1 are connected to the water inlet pipe 12 through a three-way pipe. The water inlet pipe 12 extends upward out of the wellhead. Both the water spray pipe 11 and the water inlet pipe 12 are high-pressure water pipes. The water spray end of the water spray pipe 11 is connected to a high-pressure nozzle.

[0039] A pipeline fixing beam 21 is provided above the wellhead. Three pipeline fixing pulleys 22 are installed at the bottom of the pipeline fixing beam 21. The slurry pipe 10, hydraulic oil pipe 14 and cable and communication pipeline 20 pass around the pipeline fixing pulleys 22 in a corresponding manner. The hydraulic oil pipe 14 and the cable and communication pipeline 20 pass around the same pipeline fixing pulley 22.

[0040] The pipeline fixing beam 21 and the pipeline fixing pulley 22 are rotatably connected via a pulley rotation structure 23, allowing the pipeline fixing pulley 22 to rotate around a vertical rotation axis. The pulley rotation structure 23 may include two vertically coaxial rotating shafts connected by a rotary bearing. The upper rotating shaft is connected to the pipeline fixing beam 21, and the lower rotating shaft is rotatably connected to the pulley shaft of the pipeline fixing pulley 22. The upper rotating shaft can be movably connected to the pipeline fixing beam 21, allowing it to move and be fixed along the pipeline fixing beam 21.

[0041] The front end of the vehicle body 1 is connected to the pitch angle adjustment component 3, the pitch angle adjustment component 3 is connected to the rotary drilling cutter group 4, the rear part of the outer wall of the rotary drilling cutter group 4 is hinged to the support rod 5, the support rod 5 is hinged to the vehicle body 1, the driving component of the rotary drilling cutter group 4 is the hydraulic motor 13, and the hydraulic oil pipe 14 can deliver hydraulic oil to the hydraulic motor 13.

[0042] The rear end of the vehicle body 1 is connected to the pitch angle adjustment component 2 6, the pitch angle adjustment component 2 6 is connected to the pusher 7, the rear part of the outer wall of the pusher 7 is hinged to the support rod 2 8, and the support rod 2 8 is hinged to the vehicle body 1.

[0043] Both pitch adjustment components 1 and 2 are telescopic structures. One end of pitch adjustment component 1 is hinged to the top of the vehicle body 1, and the other end is hinged to the top of the outer wall of the rotary drilling rig 4. One end of pitch adjustment component 2 is hinged to the top of the vehicle body 1, and the other end is hinged to the top of the outer wall of the pusher blade 7. Specifically, pitch adjustment component 1 includes hydraulic cylinder 1, and pitch adjustment component 2 includes hydraulic cylinder 2. Hydraulic oil pipe 14 can deliver hydraulic oil to hydraulic cylinder 1 and hydraulic cylinder 2.

[0044] In this embodiment, the walking mechanism 2 is a tracked structure, and the driving component of the walking mechanism 2 is a hydraulic motor 16. The hydraulic oil pipe 14 can deliver hydraulic oil to the hydraulic motor 16. The slurry pump 9 is a hydraulic slurry pump, and the hydraulic oil pipe 14 can deliver hydraulic oil to the slurry pump 9.

[0045] Work process:

[0046] First, the winch 25 controls the steel wire rope 24 connected to the top of the vehicle body 1 to smoothly lift the vehicle body 1 to the bottom of the caisson. At this time, the pipeline fixing beam 21 above the wellhead and the pipeline fixing pulley 22 at the bottom will provide reasonable support and guidance for the slurry pipe 10, hydraulic oil pipe 14, cable and communication pipeline 20 and water inlet pipe 12, etc., to ensure that each pipeline is not damaged during the equipment's descent into the well and can be smoothly lowered to the bottom of the well with the equipment.

[0047] After the vehicle body 1 reaches the bottom of the well, the walking mechanism 2 is activated. Since the walking mechanism 2 is a tracked structure driven by a hydraulic motor 16, hydraulic oil pipe 14 delivers hydraulic oil from the wellhead hydraulic pump station 15 to the hydraulic motor 16, driving the tracks. The tracked structure effectively distributes the equipment weight, adapts to soft or uneven well bottom surfaces, and allows the equipment to move flexibly to the designated excavation location. During movement, the camera 18 and lighting 19 mounted on the top of the bracket 17 of the vehicle body 1 are activated, transmitting the well bottom image to the surface monitoring terminal via cable and communication line 20, allowing operators to monitor the equipment's location and surrounding conditions in real time.

[0048] After the vehicle body 1 is in place, soil excavation begins. The hydraulic motor 13, the drive component of the rotary drilling rig 4, draws hydraulic oil from the hydraulic pump station 15 at the wellhead via hydraulic oil pipe 14, driving the rotary drilling rig 4 to rotate at high speed. Based on the hardness of the soil underground and the images fed back by the camera 18, the operator adjusts the speed and torque of the rotary drilling rig 4 by controlling the hydraulic oil flow and pressure. For harder soil layers, the hydraulic oil flow and pressure can be increased, allowing the rotary drilling rig 4 to break the soil with greater torque and speed, crushing it into fine particles. At the same time, the water spray pipes 11 on both sides of the vehicle body 1 begin to operate. The water inlet pipe 12 introduces water into the water spray pipes 11, which spray high-pressure water jets towards the front of the vehicle body 1, impacting the soil. Utilizing the impact force and wetting effect of the water, the soil is pre-loosened, reducing soil hardness and cutting resistance of the rotary drilling rig 4, while also preventing the rotary drilling rig 4 from directly colliding with the well wall and causing damage.

[0049] During the soil excavation and crushing process, the pitch angle adjustment component 3 (including hydraulic cylinder 1) obtains hydraulic oil through the hydraulic oil pipe 14 to control the pitch angle of the rotary cutting tool assembly 4 and improve excavation efficiency.

[0050] Simultaneously, the slurry pump 9 begins operation. Located at the rear of the rotary drilling rig 4, the slurry pump 9 draws in fine particles and slurry generated by the rotary drilling rig 4 through the suction pipe, and then discharges them through the discharge pipe 10 to the wellhead. The discharged slurry undergoes mud-water separation, with the separated water sent to the water inlet pipe 12, achieving water resource recycling. Throughout this process, the powerful suction and stable operation of the slurry pump 9 ensure the efficient execution of the excavated soil removal work.

[0051] After the rotary drilling rig 4 breaks up the soil, the pusher 7 begins operation. The pitch angle adjustment assembly 2 6 (including hydraulic cylinder 2) receives hydraulic oil through hydraulic pipe 14 to control the pitch angle of the pusher 7. The operator adjusts the extension length of hydraulic cylinder 2 of the pitch angle adjustment assembly 2 6 according to the soil accumulation, allowing the pusher 7 to concentrate and pile up the fine particles and debris broken up by the rotary drilling rig 4 at a suitable angle for subsequent cleanup.

[0052] After completing the excavation and debris removal in one area, the traveling mechanism 2 is restarted, and the equipment moves to the next work area. The steps of rotary drilling rig 4, debris removal, and pusher 7 are repeated to continue the caisson excavation. During the movement of the vehicle body 1, the pipeline fixing pulleys 22 on the pipeline fixing beam 21 at the wellhead will automatically adjust their angles according to the direction of movement of the vehicle body 1 to prevent pipeline entanglement and ensure that all pipelines can work normally while the equipment moves freely inside the caisson.

[0053] After the excavation work for the caisson is completed, the winch 25 controls the wire rope 24 to smoothly lift the vehicle body 1 from the bottom of the caisson to the top. After the vehicle body 1 is lifted to the top, the equipment is thoroughly inspected and maintained to prepare for the next construction operation.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sinking well construction earth excavation apparatus comprising a vehicle body (1) having a travelling mechanism (2) mounted on the bottom thereof, characterized in that, The front end of the vehicle body (1) is connected to the pitch angle adjustment component one (3), the pitch angle adjustment component one (3) is connected to the rotary drilling cutter group (4), the rear part of the outer wall of the rotary drilling cutter group (4) is hinged to the support rod one (5), and the support rod one (5) is hinged to the vehicle body (1); the rear end of the vehicle body (1) is connected to the pitch angle adjustment component two (6), the pitch angle adjustment component two (6) is connected to the pusher (7), the rear part of the outer wall of the pusher (7) is hinged to the support rod two (8), and the support rod two (8) is hinged to the vehicle body (1); A vertical bracket (17) is installed on the top of the vehicle body (1). A camera (18) and a lighting lamp (19) are installed on the top of the bracket (17). A cable and communication line (20) is provided on the top of the vehicle body (1). The cable and communication line (20) is electrically connected to the camera (18) and the lighting lamp (19). The cable and communication line (20) extends upward out of the wellhead.

2. A caisson construction earth excavation apparatus according to claim 1, wherein Both pitch adjustment assembly one and pitch adjustment assembly two are telescopic structures; One end of the pitch adjustment assembly is hinged to the top of the vehicle body (1), and the other end is hinged to the top of the outer wall of the rotary drilling cutter group (4); One end of the pitch adjustment component 2 is hinged to the top of the vehicle body (1), and the other end is hinged to the top of the outer wall of the pusher (7).

3. A caisson construction earth excavation apparatus according to claim 1, wherein The driving component of the rotary drilling cutter group (4) is a hydraulic motor (13). The top of the vehicle body (1) is equipped with a hydraulic oil pipe (14). The hydraulic oil pipe (14) extends upward out of the wellhead and is connected to the hydraulic pump station (15). The hydraulic oil pipe (14) can deliver hydraulic oil to the hydraulic motor (13).

4. A caisson construction earth excavation apparatus according to claim 3, wherein The walking mechanism (2) is a tracked structure. The driving component of the walking mechanism (2) is a hydraulic motor (16). The hydraulic oil pipe (14) can deliver hydraulic oil to the hydraulic motor (16).

5. The excavation equipment for caisson construction according to claim 3, characterized in that, The pitch adjustment assembly one includes a hydraulic cylinder one, the pitch adjustment assembly two includes a hydraulic cylinder two, and the hydraulic oil pipe (14) can deliver hydraulic oil to the hydraulic cylinder one and the hydraulic cylinder two.

6. A caisson construction earth excavation apparatus according to claim 3, wherein The vehicle body (1) is equipped with a grout pump (9), which is located at the rear of the rotary drilling cutter group (4). The grout pump (9) is connected to the grout suction pipe and the grout outlet pipe (10). The grout suction pipe extends downward to the bottom of the vehicle body (1), and the grout outlet pipe (10) extends upward to the wellhead. Both sides of the vehicle body (1) are equipped with water spray pipes (11). The water spray direction of the water spray pipes (11) is towards the front end of the vehicle body (1). The water spray pipes (11) on both sides of the vehicle body (1) are connected to the water inlet pipe (12), and the water inlet pipe (12) extends upward to the wellhead.

7. A caisson construction earth excavation apparatus according to claim 6 wherein, The suction pump (9) is a hydraulic suction pump, and the hydraulic oil pipe (14) can deliver hydraulic oil to the suction pump (9).

8. A caisson construction earth excavation apparatus according to claim 6, wherein A pipeline fixing beam (21) is provided above the wellhead. Three pipeline fixing pulleys (22) are installed at the bottom of the pipeline fixing beam (21). The slurry pipe (10), hydraulic oil pipe (14) and cable and communication pipeline (20) pass around the pipeline fixing pulleys (22) in a corresponding manner. The hydraulic oil pipe (14) and the cable and communication pipeline (20) pass around the same pipeline fixing pulley (22).

9. A caisson construction earth excavation apparatus according to claim 8, wherein The pipeline fixing beam (21) and the pipeline fixing pulley (22) are rotatably connected by the pulley rotation structure (23), so that the pipeline fixing pulley (22) can rotate around the rotation axis in the vertical direction.

10. A caisson construction earth excavation apparatus according to claim 1, wherein A steel wire rope (24) is connected to the top of the vehicle body (1). The steel wire rope (24) extends upward to the wellhead and is connected to the winch (25).

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