Prefabricated assembly type open caisson structure based on perturbation and construction method

Abstract

The invention relates to a prefabricated split mounting type open caisson structure based on perturbation and a construction method, the structure comprises an outer-ring cement-soil wall, an inner-ring cement-soil wall, a slurry groove, a sealing bottom, a groove bottom reinforcing cement-soil wall, wall protection slurry, grouting and a well body, and after the outer-ring cement-soil wall, the inner-ring cement-soil wall, the slurry groove and the groove bottom reinforcing cement-soil wall are machined, the well body is formed; the method comprises the following steps of: stirring and spraying slurry in a slurry groove to form wall protection slurry, putting a well body into the slurry groove, replacing the wall protection slurry with grouting, and finally mounting and sealing the bottom, so that the process is realized by the method. The outer-ring cement-soil wall, the inner-ring cement-soil wall, the slurry tank and the well body are arranged, loss of water and soil outside the well can be prevented, stability of the slurry tank can be guaranteed, the well body is controlled to sink, surrounding soil cannot be extruded, and therefore disturbance to the surrounding environment is small; the well body is composed of the prefabricated parts, the work efficiency and the quality of the prefabricated parts can be improved, the on-site construction workload is reduced, and the noise and dust pollution degree of an urban built-up area is reduced.

Description

Technical Field

[0001] This invention relates to the field of caisson structure technology, and in particular to a prefabricated assembled caisson structure based on micro-disturbance and its construction method. Background Technology

[0002] With the gradual development of urban construction, more and more municipal engineering projects need to be implemented in urban built-up areas. Pipe jacking, due to its relatively small impact on the surrounding environment, is widely used in power and water supply / drainage projects in urban built-up areas. However, the implementation of the associated pipe jacking shafts faces the following challenge: how to effectively reduce the impact of pipe jacking shaft implementation on urban built-up areas.

[0003] The invention patent with publication number CN111395375A discloses a caisson construction method based on thixotropic mud drag reduction, including construction preparation work, foundation pit excavation and sand cushion layer and plain concrete cushion layer construction, foundation pit excavation and sand cushion layer and plain concrete cushion layer construction, construction of the first, second and third sections of the caisson, first caisson sinking, construction of the fourth and fifth sections of the caisson, and second caisson sinking; the caisson adopts a non-drainage sinking process, the soil removal method is air suction with the assistance of divers, and the sinking assistance methods are pressure sinking and thixotropic mud drag reduction assistance; the caisson is sealed with plain concrete underwater, the caisson bottom plate is constructed, and the pipeline support, mud discharge well and tailwork construction are carried out; this patent has a significant impact on the surrounding soil disturbance.

[0004] Therefore, providing a caisson structure and construction method that minimizes disturbance to the surrounding environment is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a prefabricated assembled caisson structure and construction method based on micro-disturbance.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a prefabricated assembled caisson structure based on micro-disturbance is provided. The structure includes an outer ring cement-soil wall, an inner ring cement-soil wall, a mud trough, a bottom seal, a bottom-reinforcing cement-soil wall, wall-protecting mud, grouting, and a caisson body. The inner ring cement-soil wall is installed inside the outer ring cement-soil wall. The outer ring cement-soil wall is connected to the inner ring cement-soil wall via the mud trough. The bottom-reinforcing cement-soil wall is installed at the bottom of the mud trough and contacts both the outer and inner ring cement-soil walls. The caisson body is installed in the mud trough. The wall-protecting mud is installed in the mud trough. The grouting fills the space between the caisson body and the outer ring cement-soil wall. The bottom seal is installed inside the inner ring cement-soil wall.

[0008] After processing the outer ring cement-soil wall, inner ring cement-soil wall, mud trough, and bottom reinforced cement-soil wall, the mud slurry is stirred and sprayed in the mud trough to form a wall-protecting mud slurry. Then, the well body is placed in the mud trough, and the wall-protecting mud slurry is replaced with grouting. Finally, the bottom is installed.

[0009] As a preferred technical solution, the outer ring cement-soil wall, the inner ring cement-soil wall and the bottom reinforcement cement-soil wall all adopt three-axis mixing piles, and the mud tank adopts two-axis mixing piles.

[0010] As a preferred technical solution, the distance between the outer ring cement-soil wall and the inner ring cement-soil wall is greater than the thickness of the well body.

[0011] As a preferred technical solution, the bottom sealing includes bottom sealing concrete and a bottom plate, with the bottom plate installed on the bottom sealing concrete.

[0012] As a preferred technical solution, the bottom sealing concrete includes reinforcing bars, which are poured together with the bottom slab.

[0013] As a preferred technical solution, the structure further includes an annular channel composed of multiple prefabricated components, and the well body is composed of multiple annular channels.

[0014] As a preferred technical solution, the ring tracks are assembled using a staggered joint method.

[0015] As a preferred technical solution, the structure further includes embedded parts, studs, and water-stop steel plates. The embedded parts and water-stop steel plates are installed in the second annulus of the well body, and the studs are welded to the embedded parts.

[0016] As a preferred technical solution, the structure further includes a limiting unit, a limiting unit base, and a slot. The limiting unit is installed on the limiting unit base, the limiting unit base is installed next to the well body, and the slot is installed on the well body. The limiting unit and the slot cooperate with each other.

[0017] According to another aspect of the present invention, a construction method for a prefabricated assembled caisson structure based on micro-disturbance as described above is provided, the method specifically comprising:

[0018] S1. Level the site and process the outer ring cement-soil wall, the inner ring cement-soil wall, the bottom reinforced cement-soil wall and the mud slurry tank respectively.

[0019] S2. During the construction of the mud slurry tank, mud slurry is sprayed to replace the soil in the mud slurry tank with wall-protecting mud slurry.

[0020] S3. The well body, composed of prefabricated components, is lifted above the mud tank and lowered while the mud slurry for wall protection in the mud tank is discharged until the well body is in place.

[0021] S4. Use grouting to fill the space between the well body and the outer cement-soil wall;

[0022] S5. Excavate the internal soil of the inner ring cement-soil wall underwater, and after completion, pour the bottom seal underwater.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The invention includes an outer ring cement-soil wall, an inner ring cement-soil wall, a mud trough, and a well body, which can prevent the loss of water and soil outside the well and ensure the stability of the mud trough before sinking. During the sinking process, the well body sinks in a controlled manner in the mud trough and will not compress the surrounding soil. Therefore, it has little disturbance to the surrounding environment and can play a role in protecting the surrounding environment.

[0025] 2. The well body of the present invention is composed of prefabricated components, which can be produced in the factory. On the one hand, this is beneficial to improving work efficiency and the quality of prefabricated components, and on the other hand, it reduces the amount of on-site construction work, which can reduce the labor intensity of workers and reduce the degree of noise and dust pollution in urban built-up areas.

[0026] 3. The annular channels of the present invention are assembled in a staggered manner to avoid forming vertical through joints, and the staggered assembly improves the overall strength of the well body.

[0027] 4. The well body of the present invention sinks in a controlled manner in the mud tank, so there will be no sudden sinking or tilting; the soil inside the well is excavated underwater and the bottom sealing concrete is poured underwater, which can ensure the stability of the soil at the bottom of the pit and prevent the risk of sudden surge and heave.

[0028] 5. The present invention is provided with a limiting unit, a limiting unit foundation and a slot. Through the cooperation of the limiting unit and the slot, the well body can be further fixed. The limiting unit foundation can also be set in places with unstable foundation to improve the bearing capacity. Attached Figure Description

[0029] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0030] Figure 2 This is a partial planar schematic diagram of the present invention;

[0031] Figure 3 This is a schematic cross-sectional view of the prefabricated component of the present invention;

[0032] Figure 4 This is a schematic diagram of the limiting unit of the present invention;

[0033] Figure 5 This is a schematic diagram of the connection between the well body and the bottom plate of the present invention.

[0034] 11. Outer ring cement-soil wall; 12. Inner ring cement-soil wall; 13. Mud trough; 14. Trench bottom reinforced cement-soil wall; 21. Wall protection mud; 22. Well body; 23. Grouting; 24. Precast components; 25. Vertical joint; 26. Horizontal joint; 27. Slot; 31. Bottom sealing concrete; 32. Base plate; 33. Side wall; 41. Limiting unit; 42. Limiting unit foundation; 51. Embedded parts; 52. Studs; 53. Waterstop steel plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] Common construction methods for pipe jacking wells include the open-cut method with foundation pit support and the caisson method. The open-cut method with foundation pit support has advantages such as diverse construction methods and controllable environmental impact, but it also has disadvantages such as long construction period, large construction site, extensive on-site wet work, and high project costs. When implemented in soft soil areas or areas with high groundwater levels, the retaining structure needs to penetrate to a considerable depth below the pit bottom, and this part of the retaining structure becomes unusable after construction. This not only contradicts the current promotion of green and environmentally friendly concepts but also becomes an obstacle to long-term urban construction.

[0037] Compared to the open-cut method for foundation pit support, the caisson method offers advantages such as faster construction speed, lower project cost, and less abandoned work. However, conventional caisson methods have a significant impact on the surrounding environment during the sinking process, and this impact becomes even more pronounced when sudden sinking occurs or corrective measures are taken due to tilting. Furthermore, conventional caisson methods typically employ segmented casting and sinking, resulting in a certain amount of wet work still being done on-site. For these reasons, the application of the caisson method in urban built-up areas is significantly limited.

[0038] This invention provides a prefabricated assembled caisson structure and construction method based on micro-disturbance. The invention includes an outer ring of cement-soil walls, an inner ring of cement-soil walls, a mud trough, and a caisson body. This design prevents soil and water loss outside the caisson and ensures the stability of the mud trough before sinking. During sinking, the caisson body sinks in a controlled manner within the mud trough, preventing compression of the surrounding soil and minimizing environmental disturbance. The staggered joint assembly between the rings avoids vertical through joints, improving the overall strength of the caisson body. The caisson body is composed of prefabricated components, which can be manufactured in a factory. This improves efficiency and the quality of prefabricated components, reduces on-site construction work, alleviates labor intensity, and lowers noise and dust pollution levels in urban built-up areas. The well body of this invention sinks in a controlled manner within a mud tank, thus preventing sudden sinking or tilting. The underwater excavation of the soil within the well and the underwater pouring of the bottom sealing concrete ensure the stability of the soil at the bottom of the pit, eliminating the risk of sudden surges or heaves. This invention incorporates a limiting unit, a limiting unit foundation, and a locking groove. The cooperation of the limiting unit and the locking groove further secures the well body. Furthermore, the limiting unit foundation can be installed in areas of unstable foundation to improve bearing capacity.

[0039] Example 1

[0040] like Figures 1-5 As shown, a prefabricated assembled caisson structure based on micro-disturbance is disclosed. The structure includes an outer ring cement-soil wall 11, an inner ring cement-soil wall 12, a mud trough 13, a bottom seal, a bottom-reinforcing cement-soil wall 14, wall-protecting mud 21, grouting 23, and a caisson body 22. The inner ring cement-soil wall 12 is installed inside the outer ring cement-soil wall 11. The outer ring cement-soil wall 11 is connected to the inner ring cement-soil wall 12 through the mud trough 13. The bottom-reinforcing cement-soil wall 14 is installed at the bottom of the mud trough 13 and contacts both the outer ring cement-soil wall 11 and the inner ring cement-soil wall 12. The caisson body 22 is installed in the mud trough 13. The wall-protecting mud 21 is installed in the mud trough 13. The grouting 23 fills the space between the caisson body 22 and the outer ring cement-soil wall 11. The bottom seal is installed inside the inner ring cement-soil wall 12.

[0041] After processing the outer ring cement-soil wall 11, the inner ring cement-soil wall 12, the mud tank 13, and the bottom reinforced cement-soil wall 14, the mud is stirred and sprayed in the mud tank 13 to form the wall protection mud 21. Then, the well body 22 is placed in the mud tank 13, and the wall protection mud 21 is replaced with grouting 23. Finally, the bottom is installed.

[0042] A construction method for a prefabricated assembled caisson structure based on micro-disturbance, the method specifically comprising:

[0043] S1. Level the site and process the outer ring cement-soil wall 11, the inner ring cement-soil wall 12, the bottom reinforced cement-soil wall 14, and the mud trough 13 respectively.

[0044] S2. During the construction of the mud slurry tank 13, mud slurry is sprayed to replace the soil in the mud slurry tank 13 with wall-protecting mud slurry 21.

[0045] S3. The well body 22, composed of prefabricated components 24, is lifted above the mud tank 13 and lowered while the wall-protecting mud 21 in the mud tank 13 is discharged until the well body 22 is lowered into place.

[0046] S4. Use grouting 23 to fill the space between the well body 22 and the outer cement-soil wall 11;

[0047] S5. Excavate the internal soil of the inner ring cement-soil wall 12 underwater. After completion, pour the bottom seal underwater.

[0048] In this embodiment, the technical concept of the present invention is as follows: The outer ring cement-soil wall 11 and the inner ring cement-soil wall 12 are constructed first. After meeting the strength requirements, the soil of the outer ring cement-soil wall 11 and the inner ring cement-soil wall 12 is replaced with wall-protecting mud slurry 21, forming a mud slurry trough 13. The well body 22 is composed of prefabricated components 24, assembled in sections on the ground, and waterproofing measures are taken. The assembled portion of the well body 22 is hoisted above the mud slurry trough 13, and while sinking, the wall-protecting mud slurry 21 inside the mud slurry trough 13 is discharged. After the well body 22 is assembled and sunk into place, grouting 23 is used to fill the gap between the well body 22 and the outer ring cement-soil wall 11. Subsequently, the soil inside the inner ring cement-soil wall 12 is excavated using an underwater excavation method, and the bottom sealing concrete 31 is implemented using an underwater pouring method. After the bottom sealing concrete 31 meets the strength requirements, the mud inside the caisson, the bottom slab 32, and the side walls 33 can be removed.

[0049] The outer ring cement-soil wall 11, the inner ring cement-soil wall 12, and the bottom reinforced cement-soil wall 14 all adopt triaxial mixing piles, while the mud tank 13 adopts biaxial mixing piles.

[0050] The distance between the outer ring cement-soil wall 11 and the inner ring cement-soil wall 12 is greater than the thickness of the well body 22.

[0051] The bottom sealing includes bottom sealing concrete 31 and bottom plate 32, with the bottom plate 32 installed on the bottom sealing concrete 31.

[0052] The bottom sealing concrete 31 includes reinforcing bars, which are poured together with the bottom slab 32.

[0053] The structure also includes an annular channel composed of multiple prefabricated components 24, and the well body 22 is composed of multiple annular channels.

[0054] The ring tracks are assembled using a staggered joint method.

[0055] The structure also includes an embedded part 51, a stud 52, and a water-stop steel plate 53. The embedded part 51 and the water-stop steel plate 53 are installed in the second annulus of the well body 22, and the stud 52 is welded to the embedded part 51.

[0056] The structure also includes a limiting unit 41, a limiting unit base 42, and a slot 27. The limiting unit 41 is installed on the limiting unit base 42, the limiting unit base 42 is installed next to the well body 22, and the slot 27 is installed on the well body 22. The limiting unit 41 and the slot 27 cooperate with each other.

[0057] In this embodiment, it specifically includes:

[0058] 1) Before construction, the site must be leveled and obstacles within the construction area must be removed. In this embodiment, the outer ring cement-soil wall 11 uses triaxial mixing piles, constructed by connecting one hole, with the pile bottom located 6.0m below the bottom slab 32; the inner ring cement-soil wall 12 uses triaxial mixing piles, implemented with an overlap of 250mm, with the pile bottom located 1.0m below the well body 22; the net distance between the two is 140mm greater than the thickness of the well body 22. Since the bottom of the proposed well body 22 is located in a soft soil layer, trench bottom reinforcement measures are required. The trench bottom reinforcement cement-soil wall 14 uses triaxial mixing piles, with an overlap of 250mm, and the pile length extends 3.0m below the bottom of the mud slurry trench 13. The reinforcement depth of the trench bottom reinforcement cement-soil wall 14 is not less than 3.0m.

[0059] The outer ring cement-soil wall 11, the inner ring cement-soil wall 12, the bottom reinforced cement-soil wall 14, and the mud slurry tank 13 can all be constructed using various equipment. The outer ring cement-soil wall 11, the inner ring cement-soil wall 12, and the bottom reinforced cement-soil wall 14 are cement-soil reinforced bodies, which are formed by spraying cement slurry during the mixing process. After a period of time, they can solidify to form a reinforced soil body with a certain strength, which is used to retain soil and stop water, and increase the stability of the mud slurry tank.

[0060] 2) Processing the mud tank 13. A twin-shaft mixing pile construction method is used. During the mixing process, a specific ratio of wall-protecting mud 21 is sprayed to replace the soil in the tank. Before the well body 22 sinks, the mud and sediment at the bottom of the mud tank 13 should be replaced to ensure the specific gravity of the bottom mud is no greater than 1.2. In strata dominated by cohesive soil, the wall-protecting mud 21 can be prepared according to the following ratio: 10% bentonite, 0.02% CMC (cohesive modifier), and 0.5% Na2CO3 (soda ash). In strata dominated by sandy soil, the wall-protecting mud 21 can be prepared according to the following ratio: 12% bentonite, 0.05% CMC (cohesive modifier), and 0.5% Na2CO3 (soda ash). The newly prepared wall-protecting mud 21 should have a specific gravity of 1.03–1.10, a viscosity of 22s–30s, and a pH of 8–9.

[0061] The mud tank 13 initially contains soil, which is then mixed and sprayed to form a protective mud slurry 21. The well body 22 is then placed inside the mud tank 13. At this point, the mud tank 13 contains the protective mud slurry 21, the well body 22, and the protective mud slurry 21. The outer layer of protective mud slurry 21 (between the outer cement-soil wall 11 and the well body 22) is then replaced with grout 23. After the grout solidifies, it increases the side friction resistance of the well wall.

[0062] 3) Segmented Assembly of the Well Body 22. The well body 22 is divided into several rings from bottom to top. Each ring is assembled from several prefabricated components 24. The prefabricated components 24 are equipped with vertical joints 25 and horizontal joints 26. The upper and lower rings are assembled in a staggered manner to avoid forming vertical through joints 25. The well body 22 is divided into several segments according to the actual site conditions. Waterproofing measures should also be implemented as required during the assembly process. In this embodiment, the prefabricated components 24 are reinforced concrete components. They are assembled in segments of three rings (4.5m each). Each ring is 1.5m high and each ring consists of 6 identical prefabricated components 24. The horizontal joints 26 of the same ring are located on the same horizontal plane and are connected by bolts. The thickness of the prefabricated components 24 should be consistent along the vertical direction. When reinforced concrete components are used, the reinforcement should be segmented according to the internal force. When steel components are used, the steel thickness should be adjusted according to the internal force.

[0063] 4) Segmented sinking of the well body 22. From bottom to top, lifting points should be reserved on the outer side of the prefabricated components 24 of the lowest ring, and slots 27 should be reserved on the outer side of the prefabricated components 24 of the uppermost ring of each segment. The assembled well body 22 is lifted above the mud tank 13, and the mud slurry 21 for wall protection in the mud tank 13 is discharged while sinking. After the well body 22 is sunk, it should be about 1.0m above the ground. Then, the limiting unit 41 is screwed into the slot 27. When the well body 22 is deep, lifting points can be set on the lowest layer of prefabricated components 24 of the well body 22, and it can be decided whether to add more lifting points according to the actual situation. When the bearing capacity of the site foundation is insufficient, a limiting unit foundation 42 can be set to prevent the well body 22 from sinking suddenly or other lifting accidents.

[0064] 5): The well body 22 is lowered into place. The installation of the annulus is repeated until the well body 22 is lowered into place. In this embodiment, the assembly and lowering are performed four times each.

[0065] 6): Grouting 23 fills the space between the well body 22 and the outer cement-soil wall 11. Grouting 23 uses cement grout with a water-cement ratio of 0.45–0.55 and a pressure controlled between 0.2 MPa and 0.4 MPa. In this embodiment, grouting is performed at the bottom of the well body 22 and 12m above it.

[0066] 7): Underwater excavation of the soil inside the inner ring cement-soil wall 12. Underwater excavation can be carried out using underwater soil grabbing or hydraulic dredging. The excavation sequence should preferably be from the center to the perimeter. During the excavation process, the water level inside the caisson should be higher than the external groundwater level.

[0067] 8): Underwater pouring of bottom sealing concrete 31 and bottom slab 32. The pouring sequence of bottom sealing concrete 31 should start from the lowest point and gradually expand outwards. Due to the large planar dimensions of the caisson, multiple guide pipes need to be arranged for symmetrical pouring. Reinforcing bars are pre-installed in the bottom sealing concrete 31 and will be poured together with the bottom slab 32 later. In this embodiment, the well body 22 is used as a permanent structural sidewall. Embedded parts 51 are installed inside the well body 22 in the second ring. Before pouring the bottom slab, studs 52 are welded to the embedded parts 51, and a water-stop steel plate 53 is added. When the well body 22 is used as a temporary support structure, other underground structures such as the sidewall 33 can be constructed according to the usage requirements; the water-stop steel plate 53 is used to increase the waterproofing capacity of the caisson.

[0068] Conventional caisson methods have significant environmental impacts during construction and require segmented, wet-work casting, limiting their application in urban areas. The trench wall reinforcement and mud trough design of this invention prevent soil erosion and ensure controlled sinking of the well within the mud trough, minimizing environmental disturbance and protecting the surrounding environment. Furthermore, the use of prefabricated components allows for factory production, improving efficiency and quality while reducing labor intensity and pollution in urban areas.

[0069] Compared to conventional caissons, this invention causes less disturbance to the surrounding environment and can reduce settlement by more than 40%; due to the use of prefabricated components 24, it can also save construction time and reduce environmental pollution.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A prefabricated assembled caisson structure based on micro-disturbance, characterized in that, The structure includes an outer ring cement-soil wall (11), an inner ring cement-soil wall (12), a mud trough (13), a bottom seal, a bottom reinforcement cement-soil wall (14), a wall-protecting mud slurry (21), grouting (23), and a well body (22). The inner ring cement-soil wall (12) is installed inside the outer ring cement-soil wall (11). The outer ring cement-soil wall (11) is connected to the inner ring cement-soil wall (12) through the mud trough (13). The bottom reinforcement cement-soil wall (14) is installed at the bottom of the mud trough (13) and contacts the outer ring cement-soil wall (11) and the inner ring cement-soil wall (12) respectively. The well body (22) is installed in the mud trough (13). The wall-protecting mud slurry (21) is installed in the mud trough (13). The grouting (23) fills the space between the well body (22) and the outer ring cement-soil wall (11). The bottom seal is installed inside the inner ring cement-soil wall (12). After processing the outer ring cement-soil wall (11), the inner ring cement-soil wall (12), the mud tank (13), and the bottom reinforced cement-soil wall (14), the mud is stirred and sprayed in the mud tank (13) to form the wall protection mud (21). Then the well body (22) is placed in the mud tank (13), and the wall protection mud (21) is replaced with grouting (23). Finally, the bottom is installed.

2. The prefabricated assembled caisson structure based on micro-disturbance according to claim 1, characterized in that, The outer ring cement-soil wall (11), the inner ring cement-soil wall (12) and the bottom reinforced cement-soil wall (14) all adopt three-axis mixing piles, and the mud tank (13) adopts two-axis mixing piles.

3. The prefabricated assembled caisson structure based on micro-disturbance according to claim 1, characterized in that, The distance between the outer ring cement-soil wall (11) and the inner ring cement-soil wall (12) is greater than the thickness of the well body (22).

4. The prefabricated assembled caisson structure based on micro-disturbance according to claim 1, characterized in that, The bottom sealing includes bottom sealing concrete (31) and a bottom plate (32), the bottom plate (32) being installed on the bottom sealing concrete (31).

5. A prefabricated assembled caisson structure based on micro-disturbance according to claim 4, characterized in that, The bottom sealing concrete (31) includes reinforcing bars, which are cast together with the bottom slab (32).

6. The prefabricated assembled caisson structure based on micro-disturbance according to claim 1, characterized in that, The structure also includes an annular channel composed of multiple prefabricated components (24), and the well body (22) is composed of multiple annular channels.

7. A prefabricated assembled caisson structure based on micro-disturbance according to claim 6, characterized in that, The ring tracks are assembled using a staggered joint method.

8. A prefabricated assembled caisson structure based on micro-disturbance according to claim 6, characterized in that, The structure also includes an embedded part (51), a stud (52) and a water-stop steel plate (53), the embedded part (51) and the water-stop steel plate (53) are installed in the second annulus of the well body (22), and the stud (52) is welded to the embedded part (51).

9. A prefabricated assembled caisson structure based on micro-disturbance according to claim 1, characterized in that, The structure also includes a limiting unit (41), a limiting unit base (42), and a slot (27). The limiting unit (41) is installed on the limiting unit base (42), the limiting unit base (42) is installed next to the well body (22), and the slot (27) is installed on the well body (22). The limiting unit (41) and the slot (27) cooperate.

10. A construction method for a prefabricated assembled caisson structure based on micro-disturbance as described in any one of claims 1-9, characterized in that, The method specifically includes: S1. Level the site and process the outer ring cement-soil wall (11), the inner ring cement-soil wall (12), the bottom reinforced cement-soil wall (14), and the mud trough (13). S2. During the construction of the mud slurry tank (13), mud slurry is sprayed to replace the soil in the mud slurry tank (13) with wall-protecting mud slurry (21). S3. The well body (22) composed of prefabricated components (24) is lifted above the mud tank (13) and lowered while the wall-protecting mud (21) in the mud tank (13) is discharged until the well body (22) is lowered into place. S4. Use grouting (23) to fill the space between the well body (22) and the outer cement-soil wall (11); S5. Excavate the internal soil of the inner ring cement-soil wall (12) underwater, and after completion, pour the bottom seal underwater.

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