High-pressure flow type steel sheet pile cofferdam

Abstract

The application relates to a high-pressure flow-eroding steel sheet pile cofferdam. The application is suitable for the technical field of cofferdams. The technical scheme adopted by the application comprises the following: a plurality of steel sheet mechanisms, which are circumferentially closed to form the main structure of the steel sheet pile cofferdam, and are internally provided with a plurality of flow-eroding air channels; a plurality of linear close-contact components, which are arranged between adjacent steel sheet mechanisms in the same plane and can linearly splice the adjacent steel sheet mechanisms; a plurality of corner close-contact components, which are arranged at the corners of the steel sheet pile cofferdam and can splice the adjacent steel sheet mechanisms at the corners; a gas conveying component, which is arranged at the top of the steel sheet mechanism, is externally connected with a gas source, is connected with the input ends of the flow-eroding air channels and can convey pressurized gas flow into the flow-eroding air channels; and a high-pressure flow-eroding mechanism, which is arranged at the inner side of the steel sheet mechanism, and whose inner cavity is in communication with the output ends of the flow-eroding air channels and can erode the sand layer at the bottom of the steel sheet pile cofferdam under the action of the pressurized gas.

Description

Technical Field

[0001] This utility model relates to the field of cofferdam technology, and in particular to a high-pressure jet-flow steel sheet pile cofferdam. Background Technology

[0002] Cofferdams are a common type of maintenance structure in water conservancy projects. They have the functions of preventing water seepage and allowing soil to permeate, so as to facilitate drainage, excavation of foundation pits, and construction of buildings inside the cofferdam. Cofferdams mainly include steel pipe pile cofferdams and steel sheet pile cofferdams, with steel sheet pile cofferdams being the more widely used type.

[0003] In existing technologies, sheet pile cofferdams are typically assembled from several sheet piles. During use, sheet piles are driven into sand or soil layers in sequence to form the cofferdam structure. After the cofferdam construction is completed, the sheet piles need to be pulled out of the sand or soil layers for reuse.

[0004] However, due to the special geological environment underwater, once the sheet pile cofferdam is driven into the dense sand layer, the cohesiveness of the soil and the clamping force of the soil layer on the sheet pile greatly increase the difficulty of extracting the sheet pile. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a high-pressure jet-flow steel sheet pile cofferdam to address the above-mentioned problems.

[0006] The technical solution adopted in this utility model is: a high-pressure jet-flow type steel sheet pile cofferdam, comprising: Multiple steel plate structures are arranged in a circumferential manner to form the main structure of the steel sheet pile cofferdam. The interior of the steel plate structure is equipped with multiple air ducts. Multiple linearly connected components are arranged between adjacent steel plate mechanisms located in the same plane, enabling linear splicing of adjacent steel plate mechanisms; Multiple corner joint components are installed at the corners of the sheet pile cofferdam, which can connect adjacent sheet pile structures at the corners. The gas delivery assembly is located on the top of the steel plate structure and is connected to an external gas source. The gas delivery assembly is connected to the input end of each impingement air channel and can deliver pressurized airflow into the impingement air channel. The high-pressure flushing mechanism is located inside the steel sheet pile structure. The inner cavity of the high-pressure flushing mechanism is connected to the output end of the flushing air channel, which can flush the sand layer at the bottom of the steel sheet pile cofferdam under the action of pressurized gas.

[0007] In some embodiments, the steel plate mechanism includes an inner steel plate assembly and an outer steel plate assembly, which can be spliced ​​and connected by fastening bolts. Adjacent inner steel plate assemblies located in the same plane are sealed together by the linear tight connection assembly, and adjacent inner steel plate assemblies located at corners are sealed together by the corner tight connection assembly. The high-pressure flushing mechanism is installed on the inner side of the bottom of the outer steel plate assembly, and the outer steel plate assembly has flushing air passages with both ends connected to the gas supply assembly and the high-pressure flushing mechanism respectively.

[0008] In some embodiments, the inner steel plate assembly includes an inner steel plate body, the outer steel plate assembly includes an outer steel plate body, positioning connecting cylinders are connected to both sides of the inner steel plate body, a set of T-shaped limiting channels are symmetrically provided on the top wall of the inner steel plate body, a plurality of first mounting holes are opened on the surface of the inner steel plate body, an L-shaped fixing plate is connected to the top of the outer steel plate body, a second mounting hole is opened on the surface of the L-shaped fixing plate that corresponds one-to-one with the first mounting holes, and a T-shaped limiting member that can cooperate with the T-shaped limiting channel is connected to the wall of the outer steel plate body near the inner steel plate body, so that the inner steel plate body and the outer steel plate body can be inserted and cooperated through the T-shaped limiting channel and the T-shaped limiting member, and then the installation and fixing are completed by bolts passing through the first mounting holes and the second mounting holes.

[0009] In some embodiments, the high-pressure flushing mechanism includes a flushing guide assembly, a rectangular mounting port is provided at the bottom of the surface of the outer steel plate, and a flushing air passage communicating with the rectangular mounting port is provided vertically inside the outer steel plate, and the flushing guide assembly is installed inside the rectangular mounting port.

[0010] In some embodiments, the jet flow guiding assembly includes a plurality of hollow flow guiding boxes arranged in a vertical array and a telescopic jet flow assembly. The uppermost hollow flow guiding box is connected to the jet flow passage via a fixed pipe. Adjacent hollow flow guiding boxes are connected via vertical flow guiding pipes. The interior of the hollow flow guiding box is provided with a plurality of horizontally arranged flow guiding cylinders that can be connected to the vertical flow guiding pipes. The flow guiding cylinder has a guide port on the side away from the inner steel plate. The telescopic jet flow assembly is slidably installed inside the flow guiding cylinder. The telescopic jet flow assembly can slide outward under the action of the internal airflow and output pressurized airflow.

[0011] In some embodiments, the telescopic jet assembly includes a hollow jet section, the inner wall of the guide tube is provided with a limiting slide, the outer wall of the hollow jet section is provided with a guide member that can slide and cooperate with the limiting slide, the bottom of the guide tube is provided with a horizontal guide port, and the bottom of the hollow jet section is provided with a jet port that can communicate with the horizontal guide port.

[0012] In some embodiments, the linear tight-fitting assembly includes a linear tight-fitting plate, a first fixing member, and a first tight-fitting cylinder. The first tight-fitting cylinder is connected to both sides of the linear tight-fitting plate. The first tight-fitting cylinder can be tightly fitted onto the outside of the corresponding positioning connecting cylinder. A vertical notch is provided on the peripheral side of the first tight-fitting cylinder. The width of the vertical notch is the same as the thickness of the inner steel plate. A vertical mounting groove is symmetrically provided on the top of the inner steel plate. The first fixing member is symmetrically connected to the top of the linear tight-fitting plate. The first fixing member and the vertical mounting groove are connected by fastening bolts.

[0013] In some embodiments, the corner sealing assembly includes a corner sealing plate, a second fixing member, a second sealing cylinder, and a third sealing cylinder. The second sealing cylinder and the third sealing cylinder are respectively connected to both sides of the corner sealing plate. The second sealing cylinder and the third sealing cylinder can be sealed and fitted onto the outside of the corresponding positioning connecting cylinder. The peripheral surfaces of the second sealing cylinder and the third sealing cylinder are respectively provided with vertical notches. The planes in which the vertical notches are located are perpendicular to each other. The width of the vertical notches is the same as the thickness of the inner steel plate. The top of the inner steel plate is symmetrically provided with vertical mounting grooves. The top of the corner sealing plate is connected to the second fixing member. The second fixing member and the vertical mounting groove are connected by fastening bolts.

[0014] In some embodiments, the gas delivery assembly includes an annular delivery pipe, vertical gas delivery pipes, and gas delivery connectors. The annular delivery pipes are spliced ​​in a ring shape and arranged on the top of the outer steel plate assembly. The top of the annular delivery pipes is equipped with a gas delivery connector that can connect to an external gas supply device. The bottom of the annular delivery pipes is provided with a plurality of vertical gas delivery pipes that correspond one-to-one with the flushing air passages. The vertical gas delivery pipes are slidably installed inside the flushing air passages. The outer wall of the vertical gas delivery pipes is fitted with a support plate, and the support plate is connected to the top of the outer steel plate assembly by fastening bolts.

[0015] The beneficial effects of this utility model are: 1. After construction is completed, air is supplied to each flushing air channel through the air supply equipment. As the air pressure inside each hollow guide box gradually increases, the hollow flushing part inside each guide cylinder moves to the outside of the guide port until the guide part abuts against the inner end of the limiting slide. At this time, the flushing port on each hollow flushing part is connected to the outside of the hollow guide box. The high-pressure airflow output from each flushing port then flushes the sand layer at the bottom of the steel sheet pile cofferdam, thereby loosening the sand layer at the bottom of the steel sheet pile cofferdam. Under the action of the crane, it is easy to quickly lift the entire steel sheet pile cofferdam away from the sand layer.

[0016] 2. Since the first tight-fitting cylinder is sealed and fitted outside the corresponding positioning connecting cylinder, and the width of the vertical notch is consistent with the thickness of the inner steel plate, the first tight-fitting cylinder fitted on the positioning connecting cylinder will not detach from the positioning connecting cylinder in the horizontal direction. This enables stable assembly between the linear tight-fitting component and the inner steel plate component. At the same time, due to the small size of the vertical notch, the area covered by the first tight-fitting cylinder on the positioning connecting cylinder is large, which can effectively increase the tightness of the connection between the linear tight-fitting component and the inner steel plate component, thereby reducing the entry of water and sand from outside the cofferdam into the cofferdam and interfering with construction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the steel sheet pile cofferdam in this application.

[0018] Figure 2 for Figure 1 A partial structural diagram.

[0019] Figure 3 This is a schematic diagram of the gas transmission assembly in this application.

[0020] Figure 4 This is a diagram showing the coordination relationship between the steel plate mechanism and the high-pressure jetting mechanism in this application.

[0021] Figure 5 This is a structural schematic diagram of the inner steel plate assembly in this application.

[0022] Figure 6 This is a schematic diagram of the structure of the outer steel plate assembly in this application.

[0023] Figure 7 This is a schematic diagram of the high-pressure jetting mechanism in this application.

[0024] Figure 8 This is a diagram showing the fit between the hollow guide box and the telescopic jet assembly in this application.

[0025] Figure 9 This is a schematic diagram of the flow guiding component in this application.

[0026] Figure 10 This is a schematic diagram of the telescopic jet assembly in this application.

[0027] Figure 11 This is a schematic diagram of the linear close-fitting component in this application.

[0028] Figure 12 This is a schematic diagram of the corner joint assembly in this application.

[0029] Explanation of reference numerals in the attached figures: 1. Steel plate structure; 2. Inner steel plate assembly; 3. Outer steel plate assembly; 4. Linear tight-fitting assembly; 5. Corner tight-fitting assembly; 6. High-pressure flushing mechanism; 7. Flushing air passage; 8. Gas delivery assembly; 9. Inner steel plate body; 10. Positioning connecting cylinder; 11. T-shaped limiting channel; 12. Vertical mounting slot; 13. First mounting hole; 14. Outer steel plate body; 15. L-shaped fixing plate; 16. Second mounting hole; 17. T-shaped limiting component; 18. Flushing guide assembly; 19. Hollow guide box; 20. Guide port; 21. Rectangular mounting port; 22. Linear joint plate; 23. First fixing component; 24. First joint cylinder; 25. Vertical notch; 26. Corner joint plate; 27. Second fixing component; 28. Second joint cylinder; 29. ​​Third joint cylinder; 30. Flow guide cylinder; 31. Horizontal flow guide port; 32. Limiting slide; 33. Vertical flow guide pipe; 34. Fixing pipe; 35. Telescopic jet assembly; 36. Hollow jet section; 37. Guide component; 38. Jet port; 39. Annular conveying pipe; 40. Gas delivery connector; 41. Vertical gas delivery pipe; 42. Support plate.

[0030] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

[0031] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.

[0032] "First," "second," etc. As used in this article, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0034] For a specific implementation example, please refer to Implementation Example 1. Figure 1-12A high-pressure jetting type sheet pile cofferdam includes several sheet pile mechanisms 1 arranged in a circumferential array, several linear closely connected components 4 arranged in a circumferential array, corner closely connected components 5, a high-pressure jetting mechanism 6, and a gas supply component 8. Each sheet pile mechanism 1 consists of an inner sheet pile component 2 and an outer sheet pile component 3, which are connected by fastening bolts. Linear closely connected components 4 are positioned between adjacent sheet pile mechanisms 1 and are sealed to the inner sheet pile components 2 on both sides. The sheet pile cofferdam is formed by assembling the sheet pile mechanisms 1, linear closely connected components 4, and corner closely connected components 5. The corner closely connected components 5 are located at the four corners of the sheet pile cofferdam and are sealed to the inner sheet pile components 2 on both sides. The high-pressure jetting mechanism 6 is arranged in a one-to-one correspondence with each sheet pile mechanism 1 and is installed inside the outer sheet pile component 3. The outer sheet pile component 3 includes a jetting air passage 7 communicating with the inner cavity of the high-pressure jetting mechanism 6. The gas delivery assembly 8 is installed on top of the assembled sheet pile cofferdam, and the gas delivery assembly 8 is connected to each flushing gas channel 7.

[0035] In some implementation schemes, such as Figure 4 , Figure 5 and Figure 6 As shown, the inner steel plate assembly 2 includes an inner steel plate body 9. Positioning connecting cylinders 10 are fixed on both sides of the inner steel plate body 9. Two T-shaped limiting grooves 11 are symmetrically opened on the top of the inner steel plate body 9. A vertical mounting groove 12 is opened on the top of the inner steel plate body 9. The interior of the vertical mounting groove 12 has a threaded structure. Several first mounting holes 13 are opened on the surface of the inner steel plate body 9. The inner wall of the first mounting holes 13 has a threaded structure.

[0036] Furthermore, the outer steel plate assembly 3 also includes an outer steel plate body 14. An L-shaped fixing plate 15 is fixedly installed on the top of the outer steel plate body 14. The surface of the L-shaped fixing plate 15 is provided with a second mounting hole 16 that matches the first mounting hole 13. The first mounting hole 13 and the second mounting hole 16 are connected by fastening bolts. A T-shaped limiting member 17 that cooperates with the T-shaped limiting channel 11 is fixed on the side of the outer steel plate body 14 near the inner steel plate body 9. Through the cooperation of the T-shaped limiting member 17 and the T-shaped limiting channel 11, the outer steel plate body 14 and the inner steel plate body 9 can be quickly assembled, so that the outer steel plate body 14 will not detach from the inner steel plate body 9 in the horizontal direction.

[0037] In some implementation schemes, such as Figure 7 and Figure 9As shown, the high-pressure jetting mechanism 6 includes a jetting guide assembly 18. The jetting guide assembly 18 includes several hollow guide boxes 19 arranged in a vertical array, with several guide openings 20 on the side of the hollow guide boxes 19 away from the inner steel plate 9. A rectangular mounting opening 21 is provided on the surface of the outer steel plate 14 near the bottom. The hollow guide boxes 19 are fixedly installed inside the rectangular mounting opening 21, and the jetting air passage 7 inside the outer steel plate 14 communicates with the rectangular mounting opening 21.

[0038] In some implementation schemes, such as Figure 2 and Figure 11 As shown, the linear tight-fitting assembly 4 includes a linear tight-fitting plate 22. A first fixing member 23 is fixedly installed on the top of the linear tight-fitting plate 22. The first fixing member 23 is connected to the corresponding vertical mounting groove 12 by fastening bolts, which can prevent the linear tight-fitting plate 22 from detaching from the inner steel plate 9 along the vertical square. A first tight-fitting cylinder 24 is fixed on both sides of the linear tight-fitting plate 22. The first tight-fitting cylinder 24 is tightly fitted outside the corresponding positioning connecting cylinder 10. A vertical notch 25 is opened on the periphery of the first tight-fitting cylinder 24. The width of the vertical notch 25 is the same as the thickness of the inner steel plate 9. Since the first tight-fitting cylinder 24 is sealed, The first tight-fitting cylinder 24, fitted onto the outside of the corresponding positioning connecting cylinder 10, with the width of the vertical notch 25 matching the thickness of the inner steel plate 9, ensures that the first tight-fitting cylinder 24 will not detach from the positioning connecting cylinder 10 in the horizontal direction. This achieves stable assembly between the linear tight-fitting component 4 and the inner steel plate component 2. Furthermore, due to the small size of the vertical notch 25, the area covered by the first tight-fitting cylinder 24 on the positioning connecting cylinder 10 is large, which effectively increases the tightness of the connection between the linear tight-fitting component 4 and the inner steel plate component 2, thereby reducing the intrusion of water and sand from outside the cofferdam into the cofferdam and interfering with construction.

[0039] In some implementation schemes, such as Figure 2 and Figure 12 As shown, the corner joint assembly 5 includes a corner joint plate 26. A second fixing member 27 is fixedly installed on the top of the corner joint plate 26. The second fixing member 27 is connected to the corresponding vertical mounting groove 12 by fastening bolts, which can prevent the corner joint plate 26 from detaching from the inner steel plate body 9 in the vertical direction. A second joint cylinder 28 and a third joint cylinder 29 are fixed on opposite sides of the corner joint plate 26, respectively. Vertical notches 25 are opened on the periphery of the second joint cylinder 28 and the third joint cylinder 29. The vertical notches 25 on the second joint cylinder 28 and the third joint cylinder 29 are perpendicular to each other to realize the connection of the two inner steel plate assemblies 2 in the vertical direction. The second joint cylinder 28 and the third joint cylinder 29 are respectively sealed and fitted outside the corresponding positioning connecting cylinder 10.

[0040] Specific embodiment two, based on specific embodiment one, such as Figure 8As shown, a guide tube 30 corresponding to the guide port 20 is fixedly installed in the inner cavity of the hollow guide box 19. The guide tube 30 is connected to the corresponding guide port 20. Horizontal guide ports 31 and limiting slides 32 are respectively opened on the periphery of the guide tube 30. The horizontal guide ports 31 are connected to the inner cavity of the hollow guide box 19. Two adjacent hollow guide boxes 19 are connected by vertical guide tubes 33. A fixed tube 34 is connected to the top of the hollow guide box 19 above the flow guide assembly 18. The fixed tube 34 is installed inside the flow channel 7 to ensure that the external airflow can enter the fixed tube 34 along the flow channel 7, and then enter the inner cavity of the hollow guide box 19 above through the fixed tube 34. Then, it is dispersed into the inner cavity of each hollow guide box 19 through the vertical guide tubes 33, and then enters each guide tube 30 through each horizontal guide port 31.

[0041] In some implementation schemes, such as Figure 8 and Figure 10 As shown, the high-pressure flushing mechanism 6 also includes a telescopic flushing assembly 35. The telescopic flushing assembly 35 includes a hollow flushing section 36 tightly fitted to the inner wall of the guide tube 30. A guide member 37, which is slidably connected to the limiting slide 32, is fixedly disposed on the periphery of the hollow flushing section 36. A flushing port 38, communicating with its inner cavity, is opened at the bottom of the hollow flushing section 36. The flushing port 38 is connected to the horizontal guide port 31. In the initial state, the outer end of the hollow flushing section 36 is flush with the outer wall of the hollow guide box 19, and the outer wall of the hollow guide box 19 is flush with the outer surface of the outer steel plate 14. The flushing port 38 is completely inside the guide tube 30 and is always connected to the horizontal guide port 31.

[0042] In some implementation schemes, such as Figure 3 As shown, the gas delivery assembly 8 includes an annular delivery pipe 39. A gas delivery connector 40 is fixedly installed at the top of the annular delivery pipe 39, and a vertical gas delivery pipe 41 corresponding to the flushing air passage 7 is fixedly installed at the bottom of the annular delivery pipe 39. The vertical gas delivery pipe 41 is slidably fitted inside the corresponding flushing air passage 7. The support plate 42 fixed to the periphery of the vertical gas delivery pipe 41 is connected to the L-shaped fixing plate 15 by fastening bolts. The gas delivery connector 40 is used to connect to an external gas supply device, which delivers air to the annular delivery pipe 39, and then disperses it into each vertical gas delivery pipe 41.

[0043] The implementation principle of a high-pressure jet-flow steel sheet pile cofferdam is as follows: After fitting the T-shaped limiting piece 17 on the outer steel plate 14 into the T-shaped limiting groove 11 on the inner steel plate 9 from top to bottom, the outer steel plate 14 and the inner steel plate 9 are then fixed together with fastening bolts. This achieves rapid assembly between the outer steel plate 14 and the inner steel plate 9. Next, the bottom of the hollow guide box 19 below the jet flow guide assembly 18 is attached to the bottom of the rectangular mounting port 21, and the entire jet flow guide assembly 18 is pushed upwards so that the fixing tube 34 is inserted into the jet flow passage 7. The entire flow guide assembly 18 is fixed inside the rectangular mounting opening 21 by welding or fasteners, thus assembling the steel plate mechanism 1 and the high-pressure flow mechanism 6. Then, the first connecting cylinder 24 on the linear connecting plate 22 is slidably fitted from top to bottom onto the positioning connecting cylinder 10 on the inner steel plate body 9. After the initial assembly of the linear connecting assembly 4 and the steel plate mechanism 1 is completed, the linear connecting assembly 4 and the steel plate mechanism 1 are fixed together with fastening bolts. The same method is used to achieve the initial assembly of the corner connecting assembly 5 and the steel plate mechanism 1, and they are fixed together with fastening bolts. Finally, the entire air supply assembly 8 is fixedly installed on the top of the assembled cofferdam. After welding lifting lugs to the surface of the assembled steel sheet pile cofferdam, the entire steel sheet pile cofferdam is lifted into the construction water area by a crane. After the water and sand inside the steel sheet pile cofferdam are cleared, construction can begin. After construction is completed, air is supplied to each flow channel 7 through the air supply equipment. The air pressure inside each hollow guide box 19 increases accordingly. As the flow gradually increases, the hollow jetting section 36 inside each guide tube 30 moves outward toward the guide port 20 until the guide member 37 abuts against the inner end of the limiting slide 32. At this time, the jetting port 38 on each hollow jetting section 36 is connected to the outside of the hollow guide box 19. The high-pressure airflow output from each jetting port 38 then scours the sand layer at the bottom of the sheet pile cofferdam, thereby loosening the sand layer at the bottom of the sheet pile cofferdam. Under the action of the crane, it is easy to quickly lift the entire sheet pile cofferdam away from the sand layer.

[0044] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A high-pressure jet-flow type steel sheet pile cofferdam, characterized in that, include: Multiple steel plate structures (1) are arranged in a circumferential manner to form the main structure of the steel sheet pile cofferdam. Multiple air passages (7) are provided inside the steel plate structure (1). Multiple linearly connected components (4) are arranged between adjacent steel plate mechanisms (1) located in the same plane, which can linearly splice adjacent steel plate mechanisms (1); Multiple corner joint components (5) are installed at the corners of the steel sheet pile cofferdam, which can connect adjacent steel sheet structures (1) at the corners. The gas delivery assembly (8) is located on the top of the steel plate structure (1) and is connected to an external gas source. The gas delivery assembly (8) is connected to the input end of each jet air channel (7) and can deliver pressurized airflow into the jet air channel (7). The high-pressure flushing mechanism (6) is located inside the steel plate mechanism (1). The inner cavity of the high-pressure flushing mechanism (6) is connected to the output end of the flushing air channel (7), which can flush the sand layer at the bottom of the steel sheet pile cofferdam under the action of pressurized gas.

2. The high-pressure jet-flow steel sheet pile cofferdam according to claim 1, characterized in that: The steel plate mechanism (1) includes an inner steel plate assembly (2) and an outer steel plate assembly (3). The inner steel plate assembly (2) and the outer steel plate assembly (3) can be spliced ​​and connected by fastening bolts. The inner steel plate assemblies (2) located in the same plane and adjacent to each other are sealed together by the linear tight connection assembly (4). The inner steel plate assemblies (2) located at the corner and adjacent to each other are sealed together by the corner tight connection assembly (5). The high pressure flushing mechanism (6) is installed on the bottom inner side of the outer steel plate assembly (3). The outer steel plate assembly (3) has flushing air passages (7) with two ends respectively connected to the gas supply assembly (8) and the high pressure flushing mechanism (6).

3. A high-pressure jet-flow steel sheet pile cofferdam according to claim 2, characterized in that: The inner steel plate assembly (2) includes an inner steel plate body (9), and the outer steel plate assembly (3) includes an outer steel plate body (14). Positioning connecting cylinders (10) are connected to both sides of the inner steel plate body (9). A set of T-shaped limiting channels (11) are symmetrically provided on the top wall of the inner steel plate body (9). Multiple first mounting holes (13) are opened on the surface of the inner steel plate body (9). An L-shaped fixing plate (15) is connected to the top of the outer steel plate body (14). The surface of the L-shaped fixing plate (15) has openings for… The outer steel plate (14) has a second mounting hole (16) that corresponds one-to-one with the first mounting hole (13). The outer steel plate (14) is connected to the wall of the inner steel plate (9) with a T-shaped limiting member (17) that can cooperate with the T-shaped limiting channel (11). This allows the inner steel plate (9) and the outer steel plate (14) to be inserted and fitted through the T-shaped limiting channel (11) and the T-shaped limiting member (17). The installation and fixing are then completed by using bolts passing through the first mounting hole (13) and the second mounting hole (16).

4. A high-pressure jet-flow steel sheet pile cofferdam according to claim 3, characterized in that: The high-pressure flushing mechanism (6) includes a flushing guide assembly (18). The bottom surface of the outer steel plate (14) is provided with a rectangular mounting port (21). The interior of the outer steel plate (14) is provided with a flushing air passage (7) that connects to the rectangular mounting port (21) along the vertical direction. The flushing guide assembly (18) is installed in the rectangular mounting port (21).

5. A high-pressure jet-flow steel sheet pile cofferdam according to claim 4, characterized in that: The jet flow guiding assembly (18) includes multiple hollow flow guiding boxes (19) arranged in a vertical array and telescopic jet flow assembly (35). The uppermost hollow flow guiding box (19) is connected to the jet flow channel (7) via a fixed pipe (34). Adjacent hollow flow guiding boxes (19) are connected via vertical flow guiding pipes (33). The hollow flow guiding box (19) is provided with multiple horizontally arranged flow guiding cylinders (30) that can be connected to the vertical flow guiding pipes (33). The flow guiding cylinder (30) is provided with a guide port (20) on the side away from the inner steel plate (9). The telescopic jet flow assembly (35) is slidably provided inside the flow guiding cylinder (30). The telescopic jet flow assembly (35) can slide outward under the action of the internal airflow and output pressurized airflow.

6. A high-pressure jet-flow steel sheet pile cofferdam according to claim 5, characterized in that: The telescopic jet assembly (35) includes a hollow jet section (36), the inner wall of the guide tube (30) is provided with a limiting slide (32), the outer wall of the hollow jet section (36) is provided with a guide member (37) that can slide with the limiting slide (32), the bottom of the guide tube (30) is provided with a horizontal guide port (31), and the bottom of the hollow jet section (36) is provided with a jet port (38) that can connect with the horizontal guide port (31).

7. A high-pressure jet-flow steel sheet pile cofferdam according to claim 3, characterized in that: The linear tight-fitting assembly (4) includes a linear tight-fitting plate (22), a first fixing member (23) and a first tight-fitting cylinder (24). The first tight-fitting cylinder (24) is connected to both sides of the linear tight-fitting plate (22). The first tight-fitting cylinder (24) can be tightly fitted onto the outside of the corresponding positioning connecting cylinder (10). A vertical notch (25) is provided on the periphery of the first tight-fitting cylinder (24). The width of the vertical notch (25) is the same as the thickness of the inner steel plate (9). A vertical mounting groove (12) is symmetrically provided on the top of the inner steel plate (9). The first fixing member (23) is symmetrically connected to the top of the linear tight-fitting plate (22). The first fixing member (23) and the vertical mounting groove (12) are connected by fastening bolts.

8. A high-pressure jet-flow steel sheet pile cofferdam according to claim 3, characterized in that: The corner sealing assembly (5) includes a corner sealing plate (26), a second fixing member (27), a second sealing cylinder (28), and a third sealing cylinder (29). The corner sealing plate (26) is connected to the second sealing cylinder (28) and the third sealing cylinder (29) on both sides respectively. The second sealing cylinder (28) and the third sealing cylinder (29) can be sealed and fitted outside the corresponding positioning connecting cylinder (10). The second sealing cylinder (28) and the third sealing cylinder (29) are respectively provided with vertical notches (25) on their peripheral surfaces. The planes in which the vertical notches (25) are located are perpendicular to each other. The width of the vertical notches (25) is the same as the thickness of the inner steel plate (9). The top of the inner steel plate (9) is symmetrically provided with vertical mounting grooves (12). The top of the corner sealing plate (26) is connected to the second fixing member (27). The second fixing member (27) and the vertical mounting groove (12) are connected by fastening bolts.

9. A high-pressure jet-flow steel sheet pile cofferdam according to claim 2, characterized in that: The gas delivery assembly (8) includes an annular delivery pipe (39), a vertical gas delivery pipe (41), and a gas delivery connector (40). The annular delivery pipe (39) is spliced ​​in a ring shape and arranged on the top of the outer steel plate assembly (3). The top of the annular delivery pipe (39) is equipped with a gas delivery connector (40) that can connect to an external gas supply device. The bottom of the annular delivery pipe (39) is provided with multiple vertical gas delivery pipes (41) that correspond one-to-one with the flushing air passage (7). The vertical gas delivery pipes (41) are slidably installed inside the flushing air passage (7). The outer wall of the vertical gas delivery pipe (41) is fitted with a support plate (42). The support plate (42) is connected to the top of the outer steel plate assembly (3) by fastening bolts.

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