Urban caisson passive sinking "active regulation" sinking method

Abstract

The present application relates to the field of building installation, disclose a kind of urban caisson passive sinking " active regulation and control " sinking method, including regulation and control system, regulation and control system includes: protection box, it is set on ground, circulation mechanism is provided in the protection box;Connecting mechanism is connected with circulation mechanism, and the side of connecting mechanism is connected with multiple mutually spliced settlement mechanism, caisson main body, wherein multiple transversely arranged grouting holes are provided in the middle, internal pipe is connected in the grouting hole, multiple sequentially arranged vertical holes are provided on the caisson main body, vertical pipe is connected in the vertical hole, the caisson of the present application can be conveniently carried out sinking well work, while in the process of sinking well can be adjusted at any time multiple point, multidimensional, facilitate the adjustment of the posture of caisson main body, ensure the sinking well work is carried out, and can simplify excavation work, reduce the difficulty of overall work, adapt to different environment, different terrain sinking well and adjustment, wide applicability, easy to use.

Description

Technical Field

[0001] The present invention relates to the field of building installation, and in particular to a sinking method for "actively regulating" the passive sinking of an urban caisson. Background Art

[0002] A caisson is a shaft-like structure constructed by excavating soil within it. The soil is then lowered to the designed elevation by gravity, overcoming the frictional resistance of the shaft walls. The bottom is then sealed with concrete and the hole is filled, forming the foundation for a bridge pier or other structure. It is commonly used in the construction of foundation pits for large bridge piers, sewage pumping stations, large equipment foundations, civil air defense shelters, shield assembly shafts, and retaining devices for the hydraulic foundations of underground carriageways and stations. The geological conditions and surrounding environment of the pipe jacking work pit construction site are complex, making it difficult to control the verticality and stability of the caisson during construction. The deformation characteristics of the soil surrounding the caisson are difficult to grasp during actual construction. Consequently, settlement of the surrounding soil is a common problem during caisson construction. Furthermore, when excavating soil for caisson sinking in soil strata in unusual locations, the height difference between the inside and outside of the caisson can cause surrounding soil to flow into the caisson, causing the soil at the bottom of the caisson to bulge, making it difficult to sink the caisson and impacting subsequent construction. Summary of the Invention

[0003] In order to solve the technical problem of inconvenient construction adjustment, the present invention provides a sinking method of "active regulation" of passive sinking of urban caisson.

[0004] The present invention adopts the following technical solution to achieve: a sinking method of passive sinking "active regulation" of urban caisson, comprising the following steps:

[0005] S1: Geological survey to understand the distribution of underground soil layers, groundwater level and other information;

[0006] S2: Structural design, designing the appropriate caisson body size, shape and wall thickness according to geological conditions, and excavating the preliminary foundation pit on the ground;

[0007] S3: Install the platform ring in the foundation pit and hoist the caisson body at the bottom to connect it, and use its own gravity to lower the caisson body;

[0008] S4: Install the upper caisson, and install the control system on the caisson and connect it;

[0009] S5: Based on the measurement, make fine adjustments to the corresponding points to balance the caisson and reach the specified parameters;

[0010] S6: Water is injected through a high-pressure pipe to flush and soften the soil at the bottom, allowing the main body of the caisson to continue sinking;

[0011] S7: Remove part of the control system and install a new caisson body on the top caisson. After the installation is completed, the removed control system is installed and the next round of caisson is carried out.

[0012] S8: Continue to make fine adjustments by grouting at the deviation locations through measurement;

[0013] S9: Remove part of the control system and fill the corresponding holes with high-strength concrete.

[0014] As a further improvement of the above solution, the control system includes: a protection box, which is set on the ground and has a circulation mechanism inside; a connecting mechanism, which is connected to the circulation mechanism, and one side of the connecting mechanism is connected to a plurality of mutually spliced ​​settlement mechanisms;

[0015] As a further improvement of the above solution, the sinking mechanism includes: a caisson body, a plurality of grouting holes arranged horizontally in the middle, the grouting holes are connected to internal pipes, and a plurality of vertical holes arranged in the forward direction are provided on the caisson body, the vertical holes are connected to vertical pipes;

[0016] As a further improvement of the above scheme, a connecting unit is arranged in the caisson body; the connecting unit includes: a connecting sleeve three, which is fixedly connected to one end of the internal pipe, the other end of the connecting sleeve three is connected to the external pipe, the other end of the external pipe is connected to a connecting sleeve four, the middle of the connecting sleeve four is rotatably connected to the slurry pipe, and the top of the slurry pipe is rotatably connected to the connecting sleeve one; an extraction pipe is arranged in the slurry pipe, the outer side of the extraction pipe is fixedly connected to a support rod fixedly connected to the slurry pipe, and one end of the extraction pipe is rotatably connected to the connecting sleeve two; an excavation unit, which is connected to the extraction pipe at the bottom.

[0017] As a further improvement of the above scheme, the excavation unit includes: a stage-shaped ring, on which a plurality of conducting tubes are fixedly connected, one end of the conducting tubes extends into the vertical hole at the bottom for connection; a rotating column, which is rotatably sleeved on the bottom end of the conducting tube, and a plurality of fixed nozzles are fixedly connected to the outside of the rotating column; a power box, which is fixedly connected in the rotating column, the input end of the power box is connected to a feed pipe connected to the conducting tube, the power output end of the power box is transmission-connected to transmission box 2, the output end of transmission box 2 is transmission-connected to transmission box 1, the output end of transmission box 1 is connected to a pulling column, and the other end of the pulling column is fixedly connected to a moving nozzle that is slidably sleeved with the fixed nozzle.

[0018] As a further improvement of the above solution, a spray hole is provided on one side of the fixed nozzle, the cross section of the trapezoidal ring is stepped, and the liquid output end of the power box is located inside the trapezoidal ring.

[0019] As a further improvement of the above scheme, the connecting mechanism includes: a dispersion ring, which is connected to the vertical pipe at the top, and one side of the dispersion ring is connected to a high-pressure pipe connected to the circulation mechanism; a dispersion sleeve, which is connected to the connecting sleeve 1 at the top, one side of the dispersion sleeve is connected to the slurry pipe, and the top of the dispersion sleeve is connected to a sealing cover; a suction pipe, one end of which is connected to the circulation mechanism, and the other end of the suction pipe is connected to the connecting sleeve 2 at the top.

[0020] As a further improvement of the above solution, a stabilizing ring is sleeved on the outer side of the dispersion sleeve, a plurality of telescopic rods are fixedly connected to the outer side of the stabilizing ring, and one end of the telescopic rod is connected to a support column.

[0021] As a further improvement of the above scheme, the circulation mechanism includes: a sewage pump, which is fixedly connected to the protection box, the input end of the sewage pump is connected to the suction pipe, the output end of the sewage pump is connected to the lifting pipe, and the other end of the lifting pipe is connected to the filter box fixedly connected to the protection box; a guide pipe, which is connected to the filter box, and the other end of the guide pipe is connected to the filter press located in the protection box; a clean water pipe, one end of which is connected to the bottom of the filter box, and the other end is connected to the purification box fixedly connected to the protection box, and the clean water end of the filter press is connected to the purification box; a connecting pipe, one end of which is connected to the purification box, and the other end is connected to the booster located in the protection box, and one end of the booster is connected to the high-pressure pipe.

[0022] As a further improvement of the above solution, the slurry pipe water injection pressure booster is 200~1000bar, and the grouting slurry is concrete or polymer filling material.

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

[0024] 1. Through the mutual cooperation between multiple devices, the caisson work can be carried out conveniently. At the same time, multi-point and multi-dimensional adjustments can be made at any time during the caisson process to facilitate the adjustment of the caisson main body posture, ensure the progress of the caisson work, simplify the excavation work, and reduce the difficulty of the overall work.

[0025] 2. Through water circulation injection, it can save water resources while adapting to smaller caissons and reducing the area for laying surrounding equipment. It can adapt to caissons in different environments and terrains and can be adjusted. It has wide adaptability and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the front side of the present invention;

[0028] Figure 3 This is a schematic diagram of the overall structure of the rear side of the present invention;

[0029] Figure 4 It is a schematic diagram of the front structure of the circulation mechanism;

[0030] Figure 5 It is a schematic diagram of the rear structure of the circulation mechanism;

[0031] Figure 6 This is a schematic diagram of the main structure of the caisson from a bird's-eye view;

[0032] Figure 7 This is a schematic diagram of the main structure of the caisson when viewed from above;

[0033] Figure 8 Schematic diagram of the connecting mechanism structure;

[0034] Figure 9 This is a schematic diagram of the excavation unit structure;

[0035] Figure 10 This is a schematic diagram of the local structure of the excavation unit;

[0036] Figure 11 It is a partial cross-section diagram of the excavation unit;

[0037] Figure 12 This is a partial upward-looking schematic diagram of the excavation unit.

[0038] Description of main symbols:

[0039] 01. Protective box; 02. Suction pipe; 03. Slurry pipe; 04. Dispersion ring; 05. Support column; 06. Telescopic rod; 07. Vertical pipe; 08. Grouting hole; 09. Platform ring; 11. Caisson body; 12. Stabilization ring; 13. High-pressure pipe; 14. Controller; 15. Water tank; 16. Filter box; 17. Sewage pump; 20. Booster; 21. Connecting pipe; 22. Purification box; 23. Filter press; 24. Diversion pipe; 26. Lifting pipe ; 27. Dispersion sleeve; 28. Sealing cover; 29. ​​Internal tube; 30. External tube; 31. Connecting sleeve one; 32. Connecting sleeve two; 33. Extraction tube; 34. Connecting sleeve three; 35. Slurry tube; 36. Connecting sleeve four; 38. Vertical hole; 39. Conducting tube; 40. Rotating column; 41. Fixed nozzle; 42. Moving nozzle; 43. Injection hole; 44. Transmission box one; 45. Power box; 46. Transmission box two; 47. Pumping column; 48. Feeding pipe. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0041] Example:

[0042] Please combine Figure 1-12 A sinking method for passive sinking of urban caissons with "active regulation" is provided. The regulation method is implemented based on a regulation system, wherein the regulation system includes: a protection box 01, which is set on the ground. A circulation mechanism is provided in the protection box 01. The protection box 01 provides protection and limited support, and the circulation mechanism performs corresponding water circulation work to reduce the use of water resources;

[0043] The connecting mechanism is connected to the circulation mechanism, and one side of the connecting mechanism is connected with multiple mutually spliced ​​settlement mechanisms. The connecting mechanism is connected to ensure the overall penetration, and the settlement mechanism performs main body settlement and peripheral limitation work.

[0044] The settlement mechanism includes:

[0045] The caisson body 11 is provided with a plurality of grouting holes 08 arranged horizontally in the middle, and the grouting holes 08 are connected to the internal pipe 29. The caisson body 11 is provided with a plurality of vertical holes 38 arranged in the forward direction, and the vertical holes 38 are connected to the vertical pipe 07. The caisson body 11 is made of reinforced concrete material to protect the periphery of the foundation pit. The grouting holes 08 and the vertical holes 38 facilitate the installation of the internal pipe 29 and the vertical pipe 07. The internal pipe 29 and the vertical pipe 07 are made of steel material and are connected. At the same time, after the installation is completed, a certain rigid support is provided;

[0046] The connecting unit is provided in the caisson body 11 and is used for connection at the top.

[0047] The connection unit includes:

[0048] The third connecting sleeve 34 is fixedly connected to one end of the internal tube 29, and the other end of the third connecting sleeve 34 is connected to the external tube 30, and the other end of the external tube 30 is connected to the fourth connecting sleeve 36. The middle of the fourth connecting sleeve 36 is connected to the slurry tube 35 by rotation, and the top of the slurry tube 35 is connected to the first connecting sleeve 31 by rotation. The third connecting sleeve 34 is connected, and the third connecting sleeve 34 is connected to the external tube 30, thereby achieving conduction with the fourth connecting sleeve 36 and the slurry tube 35. At the same time, the fourth connecting sleeve 36 can rotate outside the 35 and cooperate with the bending or deformation of the external tube 30, so that the third connecting sleeve 34 can be connected to different 29 to achieve conduction grouting, wherein 30 adopts a deformable pipe similar to a gooseneck tube;

[0049] The extraction pipe 33 is arranged in the slurry pipe 35. The outer side of the extraction pipe 33 is fixedly connected to a support rod fixedly connected to the slurry pipe 35. One end of the extraction pipe 33 is rotatably sleeved with a second connecting sleeve 32. The extraction pipe 33 is connected. The second connecting sleeve 32 ensures the connection, so that multiple extraction pipes 33 are connected.

[0050] The excavation unit is connected to the extraction pipe 33 at the bottom, and performs the excavation of the main body.

[0051] The mining unit includes:

[0052] The platform ring 09 is fixed with multiple conducting pipes 39. One end of the conducting pipe 39 extends into the vertical hole 38 at the bottom for connection. The platform ring 09 shields the periphery. The conducting pipe 39 is connected to the vertical hole 38 in the caisson body 11 to achieve the conduction of high-pressure water for subsequent transmission.

[0053] The rotating column 40 is rotatably sleeved on the bottom end of the guide tube 39. A plurality of fixed nozzles 41 are fixedly connected to the outer side of the rotating column 40. The rotating column 40 ensures the installation of the fixed nozzles 41 and ensures the subsequent high-pressure injection.

[0054] The power box 45 is fixedly connected to the rotating column 40. The input end of the power box 45 is connected to the feed pipe 48 connected to the guide pipe 39. The power output end of the power box 45 is connected to the transmission box 2 46. The output end of the transmission box 2 46 is connected to the transmission box 1 44. The output end of the transmission box 1 44 is connected to the pumping column 47, and the other end of the pumping column 47 is fixedly connected to the mobile nozzle 42 that is slidably connected to the fixed nozzle 41. The high-pressure water flow introduced into the vertical hole 38 passes through the guide pipe 39 and the feed pipe 48 and enters the power box 45. The power box 4 5 is equipped with a paddle, which rotates under the impetus of the water flow, thereby driving the power output end to transmit the power, and at the same time, the high-pressure water overflows through the outlet of the power box 45 and enters the rotating column 40, and is further sprayed through the fixed nozzle 41 and the movable nozzle 42 to perform high-pressure washing on the surrounding soil, softening the soil structure, so that the caisson body 11 sinks. At the same time, the power is output through the transmission box 2 46, etc., driving the pumping column 47 to move back and forth, and then driving the periodic movement of the movable nozzle 42 to impact the surrounding area and perform auxiliary work.

[0055] A spray hole 43 is provided on one side of the fixed nozzle 41 . The cross section of the trapezoidal ring 09 is stepped, and the liquid output end of the power box 45 is located inside the trapezoidal ring 09 .

[0056] The connection mechanism includes:

[0057] The dispersion ring 04 is connected to the vertical pipe 07 at the top. One side of the dispersion ring 04 is connected to a high-pressure pipe 13 connected to the circulation mechanism. The bottom of the dispersion ring 04 is provided with a mounting hole. The mounting hole cooperates with the vertical pipe 07 to realize the installation between the dispersion ring 04 and the vertical pipe 07. High-pressure water is introduced into the high-pressure pipe 13 for water supply.

[0058] The dispersion sleeve 27 is connected to the top connection sleeve 31. One side of the dispersion sleeve 27 is connected to the slurry pipe 03. The top of the dispersion sleeve 27 is connected to the sealing cover 28. The dispersion sleeve 27 is connected so that it is connected to the connection sleeve 31 and the extraction pipe 33. The slurry pipe 03 is connected to the external device to supply slurry, and then grouting is performed at the corresponding position to adjust the angle of the caisson body 11.

[0059] One end of the suction pipe 02 is connected to the circulation mechanism, and the other end of the suction pipe 02 is connected to the top connecting sleeve 2 32. The suction pipe 02 is used to pump sewage and flow water along with the operation of the circulation mechanism to realize the transfer of sludge.

[0060] The outer side of the dispersion sleeve 27 is sleeved with a stabilizing ring 12, and the outer side of the stabilizing ring 12 is fixedly connected with multiple telescopic rods 06. One end of the telescopic rod 06 is connected to the support column 05. The stabilizing ring 12 is connected for stability, and the telescopic rod 06 can be telescoped. At the same time, a sensor is provided inside to measure the amount of telescopic expansion and contraction, thereby providing auxiliary support for the pipeline.

[0061] The circulation mechanism includes:

[0062] The sewage pump 17 is fixedly connected to the protection box 01, the input end of the sewage pump 17 is connected to the suction pipe 02, the output end of the sewage pump 17 is connected to the lifting pipe 26, the other end of the lifting pipe 26 is connected to the filter box 16 fixedly connected to the protection box 01, the sewage pump 17 performs the corresponding connection pumping, so that the bottom silt is transferred and enters the filter box 16 through the lifting pipe 26. The filter box 16 is provided with a filter plate to filter the water body. The silt that has been initially filtered enters the guide pipe 24. The water flows into the filter press 23, and the guide pipe 24 is connected to the filter box 16. The other end of the guide pipe 24 is connected to the filter press 23 located in the protection box 01. The clean water pipe has one end connected to the bottom of the filter box 16 and the other end connected to the purification box 22 fixedly connected to the protection box 01. The clean water end of the filter press 23 is connected to the purification box 22. The clean water pipe is used for transfer, and then the clean water from the filter box 16 and the water in the filter press 23 enter the purification box 22 for final filtration.

[0063] One end of the connecting pipe 21 is connected to the purification box 22, and the other end is connected to the booster 20 located in the protection box 01. One end of the booster 20 is connected to the high-pressure pipe 13. The water filtered by the purification box 22 is then extracted and pressurized by the booster 20 and enters the high-pressure pipe 13 for transportation. The booster 20 is equipped with a high-pressure pump and a booster for extraction and pressurization.

[0064] A water tank 15 and a controller 14 are connected to the protection box 01. One side of the water tank 15 is connected to a one-way pipe connected to the purification box 22. The one-way pipe is connected to a flow control valve and a one-way valve. Water is stored in the water tank 15 for early water supply. The controller 14 performs data processing and signal transmission on the whole.

[0065] The implementation principle of the embodiment of the present application is as follows: when working, excavation is carried out at the base layer, and then a stage-shaped ring 09 is installed in the foundation pit, and then a corresponding number of caisson bodies 11 are installed, and a dispersion ring 04, a suction pipe 02 and a dispersion sleeve 27 are installed on the top caisson body 11 to achieve connection, and then the power is turned on, so that the external water is pumped through the external water, and then enters the dispersion ring 04 through the high-pressure pipe 13, and further passes through multiple vertical pipes 07 and sealing covers 28, enters the guide pipe 39, and then passes through the feed pipe 48 and the power box 45 to achieve drive, and the high-pressure water is sprayed through the rotating column 40, the fixed nozzle 41 and the moving nozzle 42 to soften and dissolve the soil, and the caisson body 11 is lowered by the action of gravity, and at the same time, with the push of the pumping column 47 and the injection of the injection hole 43, the rotating column 40 rotates, and the moving nozzle 42 shakes to achieve auxiliary work, and the mud and water are washed and accumulated in the caisson body In the body 11, after being pumped by the sewage pump 17, the internal muddy water enters the filter box 16 through the extraction pipe 33, the suction pipe 02 and the lifting pipe 26 for the first filtration, and then through the action of gravity, the cement-containing soil enters the filter press 23 through the diversion pipe 24 for filtration, the soil is initially dried, and then loaded for transportation. The clean water in the filter press 23 and the clean water in the filter box 16 enter the purification box 22 through the purification pipe for another filtration, and is pumped and pressurized by the supercharger 20 and enters the high-pressure pipe 13 to realize circulation, thereby reducing the replenishment of external water and saving water resources. After the caisson body 11 sinks to a certain angle, the dispersion ring 04 and the dispersion sleeve 27 are removed, and then other prefabricated caisson bodies 11 are hoisted and installed on the top caisson body 11, and then the dispersion ring 04 and the dispersion sleeve 27 are installed to circulate until it reaches the designated position. The caisson bodies 11 installed at one time can be one or more.

[0066] During the sinking process of the caisson main body 11, due to external factors, the caisson main body 11 is relatively offset. At this time, special slurry can be supplied from the outside to enter the dispersion sleeve 27 through the slurry pipe 03, and then enter the external space of the caisson main body 11 through the extraction pipe 33, the external pipe 30, the connecting sleeve 34, and the internal pipe 29 to perform filling and support, adjust the designated position of the caisson main body 11, ensure the dynamic balance of the caisson main body 11, and simplify the process.

[0067] In embodiment 2, the sinking method comprises the following steps:

[0068] S1: Geological survey to understand the distribution of underground soil layers, groundwater level and other information;

[0069] S2: Structural design: Design the appropriate caisson size, shape and wall thickness based on geological conditions. Excavate the foundation pit in the early stage on the ground. The size of the caisson is set according to the specific excavation and support needs. Prefabrication is also carried out at the designated location to meet the requirements.

[0070] S3: Install the bottom layer protection in the foundation pit, and hoist the bottom caisson to connect it. Use its own gravity to lower the caisson. The bottom layer protection is synchronized with the size of the caisson and prefabricated in the early stage.

[0071] S4: Install the upper caisson, and install the control system on the caisson and connect it;

[0072] S5: Based on the measurement, make fine adjustments to the corresponding points to balance the caisson and reach the specified parameters;

[0073] S6: Water is injected through a high-pressure pipe to flush and soften the soil at the bottom, allowing the main body of the caisson to continue sinking;

[0074] S7: Remove part of the control system and install a new caisson body on the top caisson. After the installation is completed, the removed control system is installed and the next round of caisson is carried out.

[0075] S8: Continue to make fine adjustments by grouting at the deviation locations through measurement;

[0076] S9: Remove part of the control system and fill the corresponding holes with high-strength concrete.

[0077] The slurry pipe 03 has a water injection pressure booster of 200~1000bar, and the grouting slurry is concrete or polymer filling material.

[0078] The implementation principle of the embodiment of this application is:

[0079] Through the corresponding sinking method, the corresponding sinking adjustment is achieved to ensure the verticality and stability of the caisson body 11 and to ensure subsequent use.

[0080] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A sinking method for passive sinking of urban caisson with "active regulation", characterized in that: The following steps are involved: S1: Geological survey to understand the distribution of underground soil layers and groundwater level information; S2: Structural design, designing appropriate caisson size, shape and wall thickness according to geological conditions, and excavating the initial foundation pit on the ground; S3: Install bottom protection in the foundation pit and hoist the bottom caisson to connect it. Use its own gravity to lower the caisson. At the same time, control the system to destroy the bottom soil and make the caisson continue to sink. S4: Install the upper caisson, and install the control system on the caisson and connect it; S5: Based on the measurement, make fine adjustments to the corresponding points to balance the caisson and reach the specified parameters; S6: Water is injected through the control system to flush and soften the soil at the bottom again, allowing the caisson to continue sinking; S7: Remove part of the control system and install a new caisson on the top caisson. After the installation is completed, the removed control system is installed and the next round of caisson is carried out; S8: Continue to make fine adjustments by grouting at the deviation locations through measurement; S9: Remove part of the control system and fill the corresponding holes with high-strength concrete; The control method is implemented based on a control system; Wherein, the control system includes: A protection box is provided on the ground, wherein a circulation mechanism is provided in the protection box; A connecting mechanism is connected to the circulation mechanism, and one side of the connecting mechanism is connected to a plurality of mutually spliced ​​settling mechanisms; The sedimentation mechanism comprises: The caisson body is provided with a plurality of grouting holes arranged transversely in the middle, the grouting holes are connected to internal pipes, and the caisson body is provided with a plurality of vertical holes arranged in the forward direction, the vertical holes are connected to vertical pipes; A connecting unit is provided in the caisson body; The connecting unit includes: Connecting sleeve three is fixedly connected to one end of the inner tube, the other end of the connecting sleeve three is connected to the outer tube, the other end of the outer tube is connected to connecting sleeve four, the middle of the connecting sleeve four is rotatably connected to the slurry tube, and the top end of the slurry tube is rotatably connected to connecting sleeve one; An extraction pipe is arranged in the slurry pipe, the outer side of the extraction pipe is fixedly connected to a support rod fixedly connected to the slurry pipe, and one end of the extraction pipe is rotatably sleeved with a second connecting sleeve; an excavation unit connected to the bottom-most extraction pipe; The excavation unit comprises: A platform-shaped ring, to which a plurality of conducting tubes are fixedly connected, one end of each conducting tube extending into a vertical hole at the bottom for connection; A rotating column is rotatably sleeved on the bottom end of the guide tube, and a plurality of fixed nozzles are fixedly connected to the outer side of the rotating column; A power box is fixedly connected to the rotating column, the input end of the power box is connected to a feed pipe connected to the guide pipe, the power output end of the power box is transmission-connected to a transmission box 2, the output end of the transmission box 2 is transmission-connected to a transmission box 1, the output end of the transmission box 1 is connected to a twitching column, and the other end of the twitching column is fixedly connected to a moving nozzle that is slidably sleeved with a fixed nozzle; A spray hole is provided on one side of the fixed nozzle, the cross section of the trapezoidal ring is stepped, and the liquid output end of the power box is located inside the trapezoidal ring; The connecting mechanism comprises: A dispersion ring connected to the vertical pipe at the top, one side of which is connected to a high-pressure pipe connected to the circulation mechanism; A dispersion sleeve is connected to the connecting sleeve at the top, a slurry pipe is connected to one side of the dispersion sleeve, and a sealing cover is connected to the top of the dispersion sleeve; One end of the suction pipe is connected to the circulation mechanism, and the other end of the suction pipe is connected to the connecting sleeve 2 at the top.

2. The sinking method of the passive sinking "active regulation" of an urban caisson as claimed in claim 1 is characterized in that: The outer side of the dispersion sleeve is sleeved with a stabilizing ring, the outer side of the stabilizing ring is fixedly connected with a plurality of telescopic rods, and one end of the telescopic rod is connected with a supporting column.

3. The sinking method of passive sinking of an urban caisson with "active regulation" as claimed in claim 1 is characterized in that: The circulation mechanism comprises: A sewage pump is fixedly connected to the protection box, the input end of the sewage pump is connected to the suction pipe, the output end of the sewage pump is connected to a lifting pipe, and the other end of the lifting pipe is connected to a filter box fixedly connected to the protection box; A flow guide pipe connected to the filter box, wherein the other end of the flow guide pipe is connected to the filter press located in the protection box; A clean water pipe, one end of which is connected to the bottom of the filter box, and the other end is connected to a purification box fixedly connected to the protection box, and the clean water end of the filter press is connected to the purification box; One end of the series pipe is connected to the purification box, and the other end is connected to the booster located in the protection box. One end of the booster is connected to the high-pressure pipe.

4. The sinking method of the passive sinking "active regulation" of an urban caisson as claimed in claim 3 is characterized in that: A water tank and a controller are connected in the protection box. One side of the water tank is connected to a one-way pipe connected to the purification box. The one-way pipe is connected to a flow control valve and a one-way valve.

5. The sinking method of passive sinking of an urban caisson with "active regulation" as claimed in claim 1 is characterized in that: The slurry pipe injection pressure booster is 200~1000bar, and the grouting slurry is concrete or polymer filling material.

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