Deep soft soil foundation stability assisted sinking-posture controllable large caisson

Abstract

The utility model relates to a kind of deep soft soil foundation stable sinking-attitude controllable large-scale open caisson, comprising: double-row water-resisting curtain pile, double-row sinking stabilizing pile, single-row sinking stabilizing pile, foundation and large-scale open caisson;The large-scale open caisson is from first section open caisson, second section open caisson, third section open caisson and fourth section open caisson from bottom to top and is composed of.The beneficial effects of the utility model are: by setting support beam in the middle position of first section open caisson lower part in deep soft soil foundation, double-section blade foot is set under beam, single-section blade foot under well wall and double-section blade foot under support beam are all set sinking stabilizing pile to control large-scale open caisson sinking speed, realize open caisson steady vertical sinking;Ring beam is set at each section segment connection of open caisson, and the integrity of each section segment connection is enhanced, the rigidity of large-scale open caisson is enhanced, the deformation cracking phenomenon under the action of inclination, deviation, rotation and distortion when open caisson sinks is reduced, and the quality of open caisson is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of large caisson engineering, and in particular to a large caisson with stable sinking aid and controllable attitude on a deep soft soil foundation. Background Technology

[0002] Caisson construction is a popular construction technology in my country for structures such as vertical shafts, underground storage facilities, water intake and drainage pumping stations, and tunnel boring machines (TBMs) and pipe jacking shafts. Compared with the traditional methods of excavating foundation pits and constructing the main structure using either the conventional or reverse construction methods, it offers advantages such as greater burial depth, stronger integrity, better stability, a larger bearing area, and the ability to withstand larger vertical and horizontal loads. Furthermore, caisson construction has minimal impact on the foundations of adjacent buildings, especially those underground structures in soft soil. In actual construction, the accuracy of sinking large caissons has become a key aspect of project quality control.

[0003] In existing technologies, the following problems exist in the fabrication and sinking of large caissons in deep soft soil and silt layers:

[0004] 1. Caisson sinking often employs methods such as weight-assisted sinking, drainage sinking, or non-drainage sinking followed by a single bottom sealing. When the caisson's weight reaches more than 60%, the sinking rate gradually increases due to low frictional resistance, making it difficult to control the sinking speed and accuracy. This can lead to caisson shifting or tilting, failing to meet design requirements.

[0005] 2. Because the caisson is constructed and sunk in sections, the installation of the inner formwork support system is difficult during the section-by-section pouring process, resulting in low formwork efficiency and a long construction period.

[0006] 3. Because the caisson is constructed by segmented casting, the connection between the segments is not firm and the overall rigidity is poor. During sinking, the caisson wall cracks due to tilting, offsetting, rotation and torsion, which affects the quality of the caisson.

[0007] 4. Some caissons are used for pipe jacking construction in the later stage, which requires the setting of reserved holes. The steel sleeve inside the reserved hole of the caisson wall is not firmly connected to the wall. During the later pipe jacking construction, the steel sleeve is easy to fall off under the action of vibration, which affects the pipe jacking construction operation.

[0008] 5. When large caissons are being lowered, the soil layers at different parts of the foundation are not uniform, resulting in different lowering speeds for each part of the caisson. This can lead to caisson shifting or tilting. Traditional correction measures are inefficient and cannot correct the attitude in real time.

[0009] Therefore, there is an urgent need to design a simple and effective large caisson with stable sinking and controllable attitude for deep soft soil foundations. Utility Model Content

[0010] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a large caisson with stable sinking and controllable attitude in deep soft soil foundation.

[0011] This type of large caisson with stable, sinking-aiding, and attitude-controllable design on a deep, soft soil foundation includes: double-row impermeable curtain piles, double-row sinking-aiding stabilizing piles, a single-row sinking-aiding stabilizing pile, a foundation, and a large caisson. The large caisson, from bottom to top, consists of a first caisson section, a second caisson section, a third caisson section, and a fourth caisson section. Each of the first, second, third, and fourth caisson sections is equipped with a ring beam at the top, and pressure sensors are installed on the outer walls of each caisson section. A double-row impermeable curtain is installed around the large caisson. The first section of the caisson has a ring beam at the bottom of its wall, with a single-cut edge fixed at the bottom of the ring beam. A support beam is connected inside the ring beam, with a double-cut edge fixed at the bottom of the support beam. Double-row sinking stabilizing piles and single-row sinking stabilizing piles are driven into the foundation. The single-cut edge is supported on the double-row sinking stabilizing piles, and the double-cut edge is supported on the single-row sinking stabilizing piles. The second section of the caisson has a reserved hole, with a steel collar fixed inside. The steel collar is connected to the ring beams on both sides of the reserved hole through connecting bars.

[0012] Preferably, the double-row impermeable curtain piles, double-row sinking stabilizing piles, and single-row sinking stabilizing piles all adopt a high-pressure jet grouting pile structure; the bottom depth of the double-row impermeable curtain piles is at least m deeper than the bottom depth of the large caisson, and the bottom depth of the double-row sinking stabilizing piles and single-row sinking stabilizing piles is at least m deeper than the bottom depth of the large caisson; the width of the double-row sinking stabilizing piles is at least 100% greater than the width of the ring beam, and the width of the single-row sinking stabilizing piles is at least 50% greater than the width of the support beam.

[0013] Preferably, the large caisson has a square structure, the bottoms of the single-cut edge and the double-cut edge are located on the same plane, the two ends of the support beam are connected to the two long sides of the ring beam at the bottom of the first section of the caisson, and the support beam and the ring beam at the bottom of the first section of the caisson are set flush on the upper and lower sides.

[0014] Preferably, when pouring the first, second, third, or fourth caisson sections, specially designed embedded parts are fixed to the inner wall of the ring beam at the top of the first, second, third, or fourth caisson sections. The specially designed embedded parts have grooves that match the size of the steel pipes. Steel pipes are fixed between the specially designed embedded parts through the grooves. Steel plates are laid on the steel pipes, and supporting scaffolding is erected on the steel plates. The templates for the next caisson section are supported inside the supporting scaffolding, and the templates are fixed together by tie rods.

[0015] Preferably, a brick wall is built inside the steel collar, and a grid-shaped steel channel is provided on the inner side of the brick wall. The ends of the grid-shaped steel channel are welded and fixed to the steel collar.

[0016] Preferably, the pressure sensors are evenly spaced around the walls of the first, second, third, and fourth caissons; and evenly spaced on the cutting surfaces of the single-cut and double-cut edges.

[0017] Preferably, when the first, second, third, or fourth caisson is sunk, the top sidewall of the ring beam at the top of the first, second, third, or fourth caisson is fixed with a corbel by a high-strength tie rod that passes through the ring beam. The corbel is connected to a steel strand, and the steel strand is connected to a tensioning end after being turned by a steering wheel. The tensioning end is fixed to the foundation outside the double-row water-resistant curtain piles.

[0018] Preferably, the large caisson has a square structure, the ring beam has a square structure, and multiple sets of brackets are installed on the four sides of the ring beam.

[0019] Preferably, the first section of the large caisson is cast with a caisson bottom seal, and a caisson bottom plate is cast on the caisson bottom seal.

[0020] The beneficial effects of this utility model are:

[0021] 1) This utility model achieves stable and vertical sinking of the caisson by setting a support beam at the middle position of the lower part of the first section of the caisson in the deep soft soil foundation, setting a double-cut edge under the beam, and setting sinking-aiding and stabilizing piles at both the single-cut edge under the caisson wall and the double-cut edge under the support beam to control the sinking speed of the large caisson.

[0022] 2) This utility model sets ring beams at the connection of each section of the caisson to enhance the integrity of the connection between each section, thereby increasing the rigidity of the large caisson and reducing the deformation and cracking caused by tilting, offset, rotation and torsion when the caisson sinks, thus ensuring the quality of the caisson.

[0023] 3) This utility model sets up specially made embedded parts in the ring beam as support points for the subsequent segment formwork system, and lays steel plates on the specially made embedded parts, which improves the formwork efficiency of the subsequent segments and saves construction time.

[0024] 4) The steel sleeve ring inside the reserved hole of the caisson of this utility model is connected to the upper and lower ring beams through connecting bars, which enhances the firmness of the connection between the steel sleeve ring and the well wall, solves the problem that the steel sleeve ring is easy to fall off under vibration during the later pipe jacking construction, and effectively ensures the smooth operation of the later pipe jacking construction. Attached Figure Description

[0025] Figure 1 This is a plan view of the layout of large caisson water-stop curtain piles and sinking-aiding stabilizing piles;

[0026] Figure 2 This is a structural diagram of the first section of the caisson supported by single and double-cut edge footing on sinking-aiding and stabilizing piles;

[0027] Figure 3 This is a diagram showing the supporting beams and single / double-cut edge structures installed inside the lower ring beam of the first section of the caisson;

[0028] Figure 4 This is a structural diagram of the formwork system for subsequent segments after special embedded parts are installed inside the ring beam to provide auxiliary support.

[0029] Figure 5 It is a structural drawing of specially designed embedded parts;

[0030] Figure 6 This is a plan view showing the steel pipes supported by specially designed embedded parts inside the ring beam;

[0031] Figure 7 This is a diagram of the overall structure for stabilizing and sinking large caissons in deep soft soil foundations.

[0032] Figure 8 This is a cross-sectional view of the brick wall-grid steel structure inside the reserved opening in the caisson wall;

[0033] Figure 9 This is a front view of the brick wall-grid steel structure inside the reserved opening in the caisson wall;

[0034] Figure 10 This is a plan view of the brick wall-grid steel structure inside the reserved opening in the caisson wall;

[0035] Figure 11 This is a diagram of the overall structure of a large caisson with a corbel tensioning structure on top for attitude adjustment on a deep soft soil foundation.

[0036] Figure 12 Detailed diagram of the structure for attitude adjustment using a corbel tensioning structure at the top of a large caisson;

[0037] Figure 13 This is a diagram showing the bottom of a large caisson being sealed after sinking into place on a deep, soft soil foundation.

[0038] Explanation of reference numerals in the attached drawings: 1-Double-row waterproof curtain pile; 2-Double-row sinking stabilizing pile; 3-Single-row sinking stabilizing pile; 4-Single-cut edge; 5-Double-cut edge; 6-Foundation; 7-Ring beam; 8-Support beam; 9-Pressure sensor; 10-First section of caisson; 11-Special embedded part; 12-Steel pipe; 13-Steel plate; 14-Second section of caisson; 15-Supporting scaffold; 16-Formwork; 17-Tie rod; 18-Groove; 19-Steel collar; 20-Brick wall; 21-Well-shaped channel steel; 22-Third section of caisson; 23-Fourth section of caisson; 24-Connecting reinforcement; 25-Corner; 26-High-strength tie rod; 27-Steering wheel; 28-Steel strand; 29-Tensioning end; 30-Caison bottom seal; 31-Caison bottom plate; 32-Large caisson. Detailed Implementation

[0039] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0040] Example 1

[0041] As one embodiment, a large caisson with stable sinking and attitude controllable design for deep soft soil foundations is proposed, such as... Figure 1-13 As shown, the structure includes double-row impermeable curtain piles 1, double-row sinking stabilizing piles 2, single-row sinking stabilizing piles 3, foundation 6, and a large caisson 32. The large caisson 32 is composed of a first caisson section 10, a second caisson section 14, a third caisson section 22, and a fourth caisson section 23 from bottom to top. The large caisson 32 has a square structure. The top of the first caisson section 10, the second caisson section 14, the third caisson section 22, and the fourth caisson section 23 are all equipped with ring beams 7, and pressure sensors 9 are installed on the outer walls of each caisson section. Double-row impermeable curtain piles 1 are driven around the large caisson 32. The first section of the caisson 10 has a ring beam 7 at the bottom of the wall, and a single-cut edge 4 is fixed at the bottom of the ring beam 7. A support beam 8 is connected inside the ring beam 7, and a double-cut edge 5 is fixed at the bottom of the support beam 8. Double-row sinking stabilizing piles 2 and single-row sinking stabilizing piles 3 are driven into the foundation 6. The single-cut edge 4 is supported on the double-row sinking stabilizing piles 2, and the double-cut edge 5 is supported on the single-row sinking stabilizing piles 3. The second section of the caisson 14 has a reserved hole, and a steel collar 19 is fixed inside the reserved hole. The steel collar 19 is connected to the ring beams 7 on both sides of the reserved hole through connecting bars 24.

[0042] like Figure 1-3 As shown, the structure includes double-row waterproof curtain piles 1, double-row sinking stabilizing piles 2, single-row sinking stabilizing piles 3, single-cut edge foot 4, double-cut edge foot 5, foundation 6, ring beam 7, support beam 8, pressure sensor 9, first section caisson 10, and large caisson 32. The large caisson 32 has a square structure. Double-row waterproof curtain piles 1 are installed around the large caisson 32. A ring beam 7 is installed at the lower part of the wall of the first section caisson 10. A single-cut edge foot 4 is installed at the lower part of the ring beam 7. A support beam 8 is installed inside the ring beam 7. The support beam 8 is connected to the two long sides of the ring beam 7 at the lower part of the first section caisson 10 and is flush with the top and bottom. A double-cut edge foot 5 is installed at the lower part of the support beam 8. The single-cut edge foot 4 is aligned with the lower part of the double-cut edge foot 5.

[0043] Double-row sinking stabilizing piles 2 and single-row sinking stabilizing piles 3 are installed within the foundation 6. All three piles (double-row water-impermeable curtain piles 1, double-row sinking stabilizing piles 2, and single-row sinking stabilizing piles 3) adopt a high-pressure jet grouting pile structure. The double-row water-impermeable curtain piles 1 are at least 8m deeper than the sinking depth of the large caisson 32, and the double-row sinking stabilizing piles 2 and single-row sinking stabilizing piles 3 are at least 6m deeper than the sinking depth of the large caisson 32. The single-cut edge foot 4 is supported on the double-row sinking stabilizing piles 2, and the double-cut edge foot 5 is supported on the single-row sinking stabilizing piles 3. The width of the double-row sinking stabilizing piles 2 is at least 100% larger than the width of the ring beam 7, and the width of the single-row sinking stabilizing piles 3 is at least 50% larger than the width of the support beam 8.

[0044] The first section of the caisson 10 is controlled to sink by breaking down the double-row sinking stabilizing piles 2 and the single-row sinking stabilizing piles 3 in stages. The double-row sinking stabilizing piles 2 at the bottom of the caisson wall are broken down first, using symmetrical breaking, breaking down 10cm each time, first clockwise and then counterclockwise. After the double-row sinking stabilizing piles 2 are broken down 10cm, the single-row sinking stabilizing piles 3 in the middle of the caisson are broken down, breaking down 10cm each time, to prevent sinking too quickly and ensure that the large caisson 32 sinks steadily and vertically.

[0045] like Figure 4-6 As shown, when pouring the first section 10, the second section 14, the third section 22, or the fourth section 23 of the caisson, a specially designed embedded part 11 is fixed to the inner wall of the ring beam 7 at the top of the first section 10, the second section 14, the third section 22, or the fourth section 23 of the caisson. The specially designed embedded part 11 is provided with a groove 18, and the groove 18 matches the size of the steel pipe 12. The steel pipe 12 is fixed between the specially designed embedded parts 11 through the groove 18. A steel plate 13 is laid on the steel pipe 12, and a supporting scaffold 15 is erected on the steel plate 13. The template 16 of the next section of the caisson is supported in the supporting scaffold 15, and the templates 16 are fixed together by tie rods 17.

[0046] like Figure 7-9 As shown, a brick wall 20 is built inside the steel collar 19, and a grid-like channel steel 21 is provided on the inner side of the brick wall 20. The ends of the grid-like channel steel 21 are welded and fixed to the steel collar 19; the pressure sensors 9 are evenly spaced around the walls of the first section caisson 10, the second section caisson 14, the third section caisson 22, and the fourth section caisson 23; the pressure sensors 9 are evenly spaced on the cutting surfaces of the single-cutting edge 4 and the double-cutting edge 5; as shown... Figure 11-13As shown, when the first section caisson 10, the second section caisson 14, the third section caisson 22, or the fourth section caisson 23 sinks, the top sidewall of the ring beam 7 at the top of the first section caisson 10, the second section caisson 14, the third section caisson 22, or the fourth section caisson 23 is fixed with a corbel 25 by a high-strength tie rod 26 that passes through the ring beam 7. The corbel 25 is connected to a steel strand 28. The steel strand 28 is turned by a steering wheel 27 and then connected to a tensioning end 29. The tensioning end 29 is fixed on the foundation 6 outside the double-row water-resistant curtain pile 1. The large caisson 32 has a square structure, and the ring beam 7 has a square structure. Multiple sets of corbels 25 are installed on the four sides of the ring beam 7. The first section caisson 10 of the large caisson 32 is cast with a caisson bottom seal 30, and a caisson bottom plate 31 is cast on the caisson bottom seal 30.

[0047] Example 2

[0048] As another embodiment, this second embodiment proposes, based on the first embodiment, a more specific method for stabilizing and sinking large caissons with controllable attitude in deep soft soil foundations, such as... Figure 1-13 As shown, the structure includes: 1. Double-row water-resistant curtain piles; 2. Double-row sinking stabilizing piles; 3. Single-row sinking stabilizing piles; 4. Single-cut edge foot; 5. Double-cut edge foot; 6. Foundation; 7. Ring beam; 8. Support beam; 9. Pressure sensor; 10. First section caisson; 11. Specially made embedded parts; 12. Steel pipe; 13. Steel plate; 14. Second section caisson; 15. Supporting scaffolding; 16. Template; 17. Tie rods; 18. Groove; 19. Steel collar; 20. Brick wall; 21. Well-shaped channel steel; 22. Third section caisson; 23. Fourth section caisson; 24. Connecting reinforcement; 25. Corbel; 26. High-strength tie rods; 27. Steering wheel; 28. Steel strand; 29. ​​Tensioning end; 30. Caisson bottom seal; 31. Caisson bottom plate; 32. Large caisson. Figure 1 and Figure 2 As shown, the double-row impermeable curtain piles 1, double-row sinking stabilizing piles 2, and single-row sinking stabilizing piles 3 all adopt high-pressure jet grouting pile structures; the bottom depth of the double-row impermeable curtain piles 1 is at least 8m deeper than the bottom depth of the large caisson 32, and the bottom depth of the double-row sinking stabilizing piles 2 and single-row sinking stabilizing piles 3 is at least 6m deeper than the bottom depth of the large caisson 32; the width of the double-row sinking stabilizing piles 2 is at least 100% greater than the width of the ring beam 7, and the width of the single-row sinking stabilizing piles 3 is at least 50% greater than the width of the support beam 8; as Figure 3 As shown, the large caisson 32 has a square structure. The bottoms of the single-cut edge foot 4 and the double-cut edge foot 5 are located on the same plane. The two ends of the support beam 8 are connected to the two long sides of the ring beam 7 at the bottom of the first section of the caisson 10. The support beam 8 and the ring beam 7 at the bottom of the first section of the caisson 10 are set flush on the upper and lower sides.

[0049] like Figure 4-6As shown, the system includes a ring beam 7, a first section of the caisson 10, a specially designed embedded part 11, a steel pipe 12, a steel plate 13, a second section of the caisson 14, supporting scaffolding 15, formwork 16, tie rods 17, and grooves 18. For each section of the caisson being poured, a specially designed embedded part 11 is installed within its top ring beam 7. A groove 18 is provided on the specially designed embedded part 11, and a steel pipe 12 is placed within the specially designed embedded part 11. The groove 18 matches the size of the steel pipe 12. A steel plate 13 is laid on the steel pipe 12, and supporting scaffolding 15 is erected on the steel plate 13. The supporting scaffolding 15 assists in supporting the formwork 16 of the second section of the caisson 14. Tie rods 17 are installed between the formwork 16 in the supporting system for tensioning.

[0050] like Figure 7-10 As shown, the structure includes a foundation 6, a ring beam 7, a first caisson 10, a second caisson 14, a steel collar 19, a brick wall 20, a grid-like channel steel 21, and connecting bars 24. A pre-reserved hole is set in the second caisson 14 at the designed location. A steel collar 19 is installed in the pre-reserved hole. The steel collar 19 is connected to the ring beams 7 on the upper and lower sides via connecting bars 24. A brick wall 20 is built inside the steel collar 19. The brick wall 20 is located on the outside of the caisson and supports the soil of the foundation 6 during sinking. A grid-like channel steel 21 is installed on the inside of the brick wall 20. Both ends of the grid-like channel steel 21 are welded to the steel collar 19. The grid-like channel steel 21 is located on the inside of the caisson and supports and reinforces the brick wall 20.

[0051] like Figure 7 and Figure 11 As shown, the structure includes a single-cutting edge 4, a double-cutting edge 5, a ring beam 7, a pressure sensor 9, a first caisson 10, a second caisson 14, a third caisson 22, a fourth caisson 23, and a large caisson 32. The large caisson 32 can be composed of 2, 3, 4...n segments cast in sections, and is not limited to the first caisson 10, second caisson 14, third caisson 22, and fourth caisson 23 segments. The ring beam 7 serves as the dividing line between the first caisson 10, second caisson 14, third caisson 22, and fourth caisson 23. Pressure sensors 9 are installed around each caisson segment to monitor the lateral soil pressure. The pressure sensors 9 are evenly spaced around the caisson wall of each caisson segment, with an adjacent spacing of 3m. They are also evenly spaced on the cutting surfaces of the single-cutting edge 4 and the double-cutting edge 5, with an adjacent spacing of 2m.

[0052] like Figure 11-12As shown, the structure includes a ring beam 7, pressure sensor 9, fourth caisson section 23, bracket 25, high-strength tie rod 26, steering wheel 27, steel strand 28, tensioning end 29, etc. Each caisson section is monitored in real-time using a total station for indicators such as caisson attitude, sinking depth, corner height difference, caisson tilt, offset, and rotation. During sinking, brackets 25 are installed on the top ring beam 7. The large caisson 32 has a square structure, and the top ring beam 7 also has a square structure. Each square... Multiple sets of brackets 25 are installed on each of the four sides. The brackets 25 are fixed to the ring beam 7 by high-strength tie rods 26, which pass through the ring beam 7. Steel strands 28 are set on the brackets 25. The steel strands 28 are connected to the tensioning end 29 after being turned by the steering wheel 27. When the well body tilts, the steel strands 28 on the brackets 25 in the opposite direction of the well body tilt are tensioned to control the attitude of the caisson in each direction, so as to realize timely correction of the attitude of the large caisson 32.

[0053] like Figure 13 As shown, it includes a first section of caisson 10, a double-cut edge foot 5, a support beam 8, a caisson bottom seal 30, and a caisson bottom plate 31. After the first section of caisson 10 sinks to the designed position, concrete is poured for the caisson bottom seal 30. The caisson bottom seal 30 completely encloses the double-cut edge foot 5 and the support beam 8. The caisson bottom plate 31 is then poured on the caisson bottom seal 30.

[0054] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A large caisson with stable sinking and controllable attitude in deep soft soil foundation, characterized in that, include: The foundation comprises double-row impermeable curtain piles, double-row sinking stabilizing piles, single-row sinking stabilizing piles, a foundation, and a large caisson. The large caisson, from bottom to top, consists of a first caisson section, a second caisson section, a third caisson section, and a fourth caisson section. Each of the first, second, third, and fourth caisson sections has a ring beam at its top, and pressure sensors are installed on the outer walls of each caisson section. Double-row impermeable curtain piles are driven around the large caisson. A ring beam is located at the bottom of the first caisson section, with a single-cut edge fixed to the bottom of the ring beam. A support beam is connected inside the ring beam, with a double-cut edge fixed to the bottom of the support beam. Double-row sinking stabilizing piles and single-row sinking stabilizing piles are driven into the foundation. The single-cut edge supports the double-row sinking stabilizing piles, and the double-cut edge supports the single-row sinking stabilizing piles. A pre-drilled hole is opened in the second caisson section, and a steel collar is fixed inside the pre-drilled hole. The steel collar is connected to the ring beams on both sides of the pre-drilled hole via connecting bars.

2. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, The double-row impermeable curtain piles, double-row sinking stabilizing piles, and single-row sinking stabilizing piles all adopt high-pressure jet grouting pile structures; the bottom depth of the double-row impermeable curtain piles is at least m deeper than the bottom depth of the large caisson, and the bottom depth of the double-row sinking stabilizing piles and single-row sinking stabilizing piles is at least m deeper than the bottom depth of the large caisson; the width of the double-row sinking stabilizing piles is at least 100% greater than the width of the ring beam, and the width of the single-row sinking stabilizing piles is at least 50% greater than the width of the support beam.

3. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, The large caisson has a square structure. The bottoms of the single-cut and double-cut edges are located on the same plane. The two ends of the support beam are connected to the two long sides of the ring beam at the bottom of the first section of the caisson. The support beam and the ring beam at the bottom of the first section of the caisson are set flush on the upper and lower sides.

4. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, When pouring the first, second, third, or fourth section of the caisson, specially designed embedded parts are fixed to the inner wall of the ring beam at the top of the first, second, third, or fourth section of the caisson. The specially designed embedded parts have grooves that match the size of the steel pipes. Steel pipes are fixed between the specially designed embedded parts through the grooves. Steel plates are laid on the steel pipes, and supporting scaffolding is erected on the steel plates. The templates for the next section of the caisson are supported in the supporting scaffolding, and the templates are fixed together by tie rods.

5. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, A brick wall is built inside the steel collar, and a grid-shaped steel channel is provided on the inner side of the brick wall. The ends of the grid-shaped steel channel are welded and fixed to the steel collar.

6. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, The pressure sensors are evenly spaced around the walls of the first, second, third, and fourth caissons; the pressure sensors are evenly spaced on the cutting surfaces of the single-cut and double-cut edges.

7. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, When the first, second, third, or fourth caisson is lowered, the top sidewall of the ring beam at the top of the first, second, third, or fourth caisson is fixed with a corbel by a high-strength tie rod that runs through the ring beam. The corbel is connected to a steel strand, and the steel strand is connected to a tensioning end after being turned by a steering wheel. The tensioning end is fixed to the foundation outside the double-row water-resistant curtain piles.

8. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 7, characterized in that, The large caisson has a square structure, and the ring beam has a square structure. Multiple sets of brackets are installed on the four sides of the ring beam.

9. The large caisson with stable sinking and attitude controllable in deep soft soil foundation as described in claim 1, characterized in that, The first section of the large caisson is sealed with a caisson bottom, and a caisson bottom slab is poured on the caisson bottom.

Images