Modularized quick-assembly steel sheet pile cofferdam and construction method thereof

Abstract

The application relates to the technical field of steel sheet pile cofferdam construction, and discloses a modularized quick assembly steel sheet pile cofferdam and a construction method thereof. The steel sheet pile cofferdam comprises a steel sheet pile body, one side of the steel sheet pile body is provided with a butt joint assembly, and the other side of the steel sheet pile body is provided with a plug-in assembly; the butt joint assembly comprises a butt joint seat fixedly installed on the outer side of the steel sheet pile body, a butt joint sleeve is rotatably installed on the outer side of the butt joint seat, and a connecting hole is formed in the top of the butt joint sleeve. The modularized quick assembly steel sheet pile cofferdam and the construction method thereof can effectively solve the problem that, in the prior art, due to the large length, limited rigidity and large weight of the steel sheet pile component, the steel sheet pile component is easily disturbed by factors such as water flow, wind wave and construction machinery vibration during hoisting and plug-in, so that the positions of two adjacent steel sheet piles need to be continuously calibrated manually during butt joint, thereby affecting the assembly efficiency of the steel sheet pile.

Description

Technical Field

[0001] This invention relates to the field of steel sheet pile cofferdam construction technology, specifically to a modular, rapid-assembly steel sheet pile cofferdam and its construction method. Background Technology

[0002] Steel sheet pile cofferdams are commonly used temporary water-retaining structures in water conservancy projects and bridge foundation construction. They are formed by sequentially splicing multiple steel sheet pile units to create a closed water-retaining system. They have the characteristics of high structural strength, reliable water-stopping performance, and reusability, and are widely used in deep foundation pit and underwater foundation construction scenarios.

[0003] The existing splicing of sheet piles generally adopts a side-locking plug-in structure, that is, a male and female lock are respectively set on both sides of a single sheet pile. When splicing adjacent sheet piles, the male lock is inserted into the inner cavity of the female lock along the axial direction of the pile body, thereby realizing the mechanical connection and water-stop sealing of adjacent piles. However, due to the large length, limited rigidity and heavy weight of the sheet pile components themselves, they are easily affected by factors such as water flow, wind and waves and vibration of construction machinery during hoisting and driving. As a result, during the docking process, it is necessary to manually continuously calibrate the positions of the two adjacent locks. Especially in underwater operations, complex geological environments or deep driving conditions, the space for manual calibration is limited and the operation is difficult, which directly affects the splicing efficiency and causes the overall construction cycle of the cofferdam to be significantly extended. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a modular rapid assembly steel sheet pile cofferdam and its construction method, which can effectively solve the problem that in the existing technology, due to the large length, limited rigidity and heavy weight of the steel sheet pile components, they are easily affected by factors such as water flow, wind waves and vibration of construction machinery during hoisting and driving, which leads to the need for manual calibration of the positions of adjacent steel sheet piles during the docking process, thus affecting the assembly efficiency of steel sheet piles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a modular, rapid-assembly steel sheet pile cofferdam and its construction method, comprising: The sheet pile body has a butt joint assembly on one side and a plug-in assembly on the other side. The docking assembly includes a docking seat fixedly installed on the outside of the steel sheet pile body, and a docking sleeve rotatably installed on the outside of the docking seat. The top of the docking sleeve is provided with a connection hole, which includes an integrally formed docking hole, a correction hole and a translation hole. The correction hole is tapered. The plug assembly includes a plug seat fixedly installed on the outside of the steel sheet pile body, and a plug post fixedly installed on the outside of the plug seat, and an abutment part is provided at the bottom of the plug post. The insertion post is equipped with a constraint mechanism for locking the mating sleeve.

[0006] Furthermore, the diameter of the mating hole is larger than the diameter of the translation hole, and the inner wall of the translation hole is in contact with the outer circumferential surface of the insertion post.

[0007] Furthermore, the outer side of the docking sleeve is provided with a slot that communicates with the connecting hole. An adjusting block is fixedly installed on the outer side of the docking sleeve, and there are two adjusting blocks that are symmetrically distributed along the central surface of the docking sleeve. A locking groove is provided on the outer circumferential surface of the adjusting block, and there are multiple locking grooves that are distributed in a circumferential array along the central axis of the adjusting block.

[0008] Furthermore, the docking seat has an annular groove inside that fits against the outer side of the adjusting block, and the docking seat is fitted with a locking pin that fits against the inner wall of the locking groove through a mounting hole on its outer side, and the mounting hole and the annular groove are connected.

[0009] Furthermore, the constraint mechanism includes a movable groove formed in the plug-in seat and extending into the plug-in post. The plug-in seat has an assembly hole communicating with the movable groove. The movable groove is fitted with a movable frame by an elastic element disposed therein. An abutment pin that fits against the top of the movable frame is fitted in the assembly hole.

[0010] Furthermore, the outer side of the plug-in post is provided with a movable hole that communicates with the movable slot, and there are multiple movable holes arranged in an array along the central axis of the plug-in post. A locking block is rotatably connected in the movable hole, and a locking hole that fits against the outer side of the locking block is provided in the translation hole.

[0011] Furthermore, a toothed ring is fixedly installed on the outer side of the locking block, and a magnetic component is fixedly installed at the end of the locking block, and the magnetic component is magnetically connected to the inner wall of the locking hole.

[0012] Furthermore, the movable frame is provided with a clearance groove, and the clearance groove and the locking block are distributed in a one-to-one correspondence. A rack that meshes with the gear ring is fixedly installed in the clearance groove.

[0013] A construction method for a modular, rapid-assembly steel sheet pile cofferdam includes the following steps: S1. Loosen the locking pin of the docking seat to release the constraint of the adjusting block, rotate the docking sleeve to the target angle, and screw in the locking pin to make the docking sleeve mechanically locked. S2. Hoist the sheet piles to be assembled to the side of the driven pile body, align the insertion column with the docking hole of the docking sleeve and lower it. The insertion column contacts the docking hole, the correction hole and the translation hole in sequence. When the insertion column reaches the correction hole, the conical surface of the correction hole corrects the position of the insertion column until the insertion column moves to the bottom of the translation hole, and the initial assembly of the sheet pile body is completed. S3. After the main body of the steel sheet pile is driven into place, the abutment pin is screwed to release the axial constraint. The elastic element drives the moving frame to slide in the movable groove. Through the meshing transmission of the rack and gear ring, the locking block rotates outward from the movable hole and is embedded in the locking hole to form an interlock, thus completing the locking between the main bodies of the steel sheet pile. S4. Repeat S1 to S3 to assemble the next set of sheet piles.

[0014] The technical solution provided by this invention has the following advantages compared with the prior art: This invention includes a docking assembly and a plug-in assembly. The docking sleeve has an integrally formed connection hole, which includes a docking hole, a correction hole, and a translation hole with successively decreasing diameters. The diameter of the docking hole is larger than the outer diameter of the plug-in column, providing a large tolerance for the initial access space during hoisting operations and significantly reducing the alignment accuracy requirements. Subsequently, the arc-shaped end of the bottom of the plug-in column enters the cone-shaped correction hole. Under the guidance of the inner wall of the cone surface of the correction hole, a normal reaction force is generated. This component force smoothly pushes the plug-in column to retract towards the central axis, realizing automatic radial correction and self-centering of adjacent piles. This eliminates the need for repeated alignment by construction personnel and improves the assembly efficiency of the steel sheet pile body.

[0015] This invention incorporates a constraint mechanism within the plug-in post. After assembly, loosening the abutment pin releases the axial constraint, and the elastic element releases potential energy to push the moving frame to slide axially. The rack in the moving frame's clearance groove engages with the gear ring on the outer periphery of the locking block, causing the locking block to rotate out of the movable hole and engage with the locking hole on the inner wall of the translation hole, forming a mechanical barb-type interlocking structure. Simultaneously, the magnetic element at the end of the locking block magnetically attracts the inner wall of the locking hole, forming an auxiliary self-locking constraint. Under dynamic load, this magnetic attraction can prevent the locking block from undergoing slight rotation or dislocation.

[0016] This invention achieves angle adjustment through the rotational connection between the docking sleeve and the docking seat. During adjustment, the locking pin on the outside of the docking seat is unscrewed to release the fitting constraint, and the docking sleeve can rotate freely along its own central axis. After rotating the docking sleeve to match the orientation of the slot according to the angle requirement, the locking pin is screwed back in to embed into the corresponding locking groove, forming a rigid physical locking constraint. The attitude switching and locking of multiple angles can be completed by simply loosening, rotating and tightening the screw. Moreover, the physical locking structure can effectively resist the insertion torque and circumferential disturbance, giving the cofferdam structure a strong ability to adapt to irregular boundaries, greatly shortening the corner operation time and improving the closure efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional separation structure of the docking component according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the docking sleeve according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the plug-in assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the three-dimensional separation structure of the plug-in assembly according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the abutment portion according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the three-dimensional separation structure of the locking block and the movable frame according to an embodiment of the present invention; Figure 8 This is a schematic cross-sectional view of the docking sleeve and plug-in post according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the assembly plan of the steel sheet pile body according to an embodiment of the present invention; Figure 10 This is a flowchart illustrating the construction method for assembling the main body of the steel sheet pile according to an embodiment of the present invention.

[0019] The labels in the diagram represent: 1. Sheet pile body; 2. Connecting assembly; 21. Connecting seat; 211. Ring groove; 212. Mounting hole; 213. Locking pin; 22. Connecting sleeve; 23. Connecting hole; 231. Connecting hole; 232. Alignment hole; 233. Translation hole; 24. Slot; 25. Adjusting block; 251. Locking slot; 3. Insertion assembly; 31. Insertion seat; 32. Insertion post; 321. Abutment part; 33. Restraint mechanism; 331. Movable slot; 332. Assembly hole; 333. Elastic element; 334. Moving frame; 3341. Clearance slot; 3342. Rack; 335. Abutment pin; 336. Movable hole; 337. Locking block; 3371. Gear ring; 3372. Magnetic element; 338. Locking hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example: Please see Figures 1-9 This invention provides a technical solution: a modular, rapid-assembly steel sheet pile cofferdam, comprising: The sheet pile body 1 has a butt joint assembly 2 on one side and a plug-in assembly 3 on the other side. The docking assembly 2 includes a docking seat 21 fixedly installed on the outside of the steel sheet pile body 1, and a docking sleeve 22 is rotatably installed on the outside of the docking seat 21. A connection hole 23 is provided on the top of the docking sleeve 22. The connection hole 23 includes an integrally formed docking hole 231, a correction hole 232 and a translation hole 233. The correction hole 232 is tapered. The plug assembly 3 includes a plug seat 31 fixedly installed on the outside of the sheet pile body 1, and a plug post 32 fixedly installed on the outside of the plug seat 31, and the bottom of the plug post 32 is provided with an abutment part 321. The insertion post 32 is equipped with a constraint mechanism 33 for locking the docking sleeve 22.

[0023] The diameter of the mating hole 231 is larger than the diameter of the translation hole 233, and the inner wall of the translation hole 233 fits against the outer circumferential surface of the insertion post 32.

[0024] The outer side of the docking sleeve 22 is also provided with a slot 24 that communicates with the connecting hole 23. An adjusting block 25 is fixedly installed on the outer side of the docking sleeve 22. There are two adjusting blocks 25, which are symmetrically distributed along the center plane of the docking sleeve 22. A locking groove 251 is provided on the outer circumferential surface of the adjusting block 25. There are multiple locking grooves 251, which are distributed in a circular array along the central axis of the adjusting block 25.

[0025] The docking seat 21 has an annular groove 211 inside that fits against the outer side of the adjusting block 25. The docking seat 21 is fitted with a locking pin 213 that fits against the inner wall of the locking groove 251 through a mounting hole 212 on its outer side. The mounting hole 212 and the annular groove 211 are connected.

[0026] The restraint mechanism 33 includes a movable groove 331 formed in the plug-in seat 31 and extending into the plug-in post 32. The plug-in seat 31 has an assembly hole 332 that communicates with the movable groove 331. The movable groove 331 is fitted with a movable frame 334 through an elastic member 333 disposed therein. An abutment pin 335 that fits against the top of the movable frame 334 is fitted in the assembly hole 332.

[0027] The outer side of the plug-in post 32 is provided with a movable hole 336 that communicates with the movable slot 331. Multiple movable holes 336 are provided and arranged in an array along the central axis of the plug-in post 32. A locking block 337 is rotatably connected in the movable hole 336. A locking hole 338 that fits against the outer side of the locking block 337 is provided in the translation hole 233.

[0028] A toothed ring 3371 is fixedly installed on the outer side of the locking block 337, and a magnetic component 3372 is fixedly installed on the end of the locking block 337. The magnetic component 3372 is magnetically connected to the inner wall of the locking hole 338.

[0029] The movable frame 334 has a clearance groove 3341, and the clearance groove 3341 and the locking block 337 are distributed in a one-to-one correspondence. A rack 3342 that meshes with the gear ring 3371 is fixedly installed in the clearance groove 3341.

[0030] Working principle and advantages of this modular, rapid-assembly steel sheet pile cofferdam: Because steel sheet pile components are long, have limited stiffness, and are heavy, they are easily affected by factors such as water flow, wind and waves, and vibrations from construction machinery during hoisting and driving. This results in the need for manual calibration of the positions of adjacent interlocking points during the connection process. This is especially true in underwater operations, complex geological environments, or deep driving conditions, where the space for manual calibration is limited and the operation is difficult.

[0031] When assembling adjacent sheet pile bodies 1, the docking component 2 of the first sheet pile body 1 that has been driven is in the preset position. The second sheet pile body 1 to be assembled is hoisted to the vicinity of the docking position by hoisting equipment. It is only necessary to make the insertion column 32 and the connection hole 23 of the docking sleeve 22 roughly aligned before it can be lowered.

[0032] The connecting hole 23 of the connecting sleeve 22 is composed of a connecting hole 231, a conical correction hole 232 and a translation hole 233 connected in sequence. The diameter of the connecting hole 231 is larger than the outer diameter of the insert post 32, providing a large tolerance initial access space for the insert post 32, which greatly reduces the accuracy requirements for hoisting and positioning. As the steel sheet pile body 1 continues to be lowered, the abutting part 321 of the insert post 32 contacts the inner wall of the conical surface of the conical correction hole 232. The guiding effect of the conical surface applies a radial correction force to the insert post 32, which drives the steel sheet pile body 1 to be assembled to produce radial micro-adjustment, so that the axis of the insert post 32 gradually coincides with the axis of the connecting hole 23, completing the automatic correction and positioning of adjacent piles without the need for manual intervention to repeatedly calibrate the position of the steel sheet pile body 1.

[0033] The abutment portion 321 at the bottom of the insertion post 32 is composed of an arc and a cone shape. When the arc segment contacts the inner wall of the cone-shaped correction hole 232, a smooth sliding pair of arc and cone surfaces is formed. Compared with a straight surface or sharp edge, when the arc end is subjected to downward gravity, the normal reaction force generated by the cone surface of the correction hole 232 can be smoothly decomposed into axial and radial components along the tangent direction of the arc surface. This smooth transition of line contact or point contact avoids stress concentration and mechanical interference caused by the sharp corner getting stuck at a certain point on the cone surface. At the same time, when the cone segment at the foremost end enters the soil layer, the cone geometry can effectively convert the axial downward kinetic energy of the pile into radial compressive force on the surrounding soil, forcing the soil directly below the pile end to be pushed outward, thereby significantly reducing the pile end resistance.

[0034] The main function of the conical correction hole 232 is to guide and force correction, while the arc-shaped end face of the insertion post 32 can smoothly conform to the conical surface. Under the action of gravity and the downward pressure of the pile driver, the conical inner wall of the correction hole 232 generates a normal reaction force on the arc-shaped end. This component force will smoothly push the insertion post 32 to converge towards the central axis. At the same time, when the arc-shaped end of the insertion post 32 contacts the wall of the conical hole, the initial state is point contact or near-line contact, which gradually transitions as it is lowered. Compared with a flat end face or an end with a sharp edge, this curved surface contact greatly reduces the sliding friction resistance, which can effectively prevent the insertion post 32 from mechanically interfering or jamming due to the sharp corner getting stuck at a certain point on the conical surface when it is lowered under external force interference, thus ensuring the continuity of the lowering action.

[0035] After calibration, the insertion post 32 enters the translation hole 233 section. The inner diameter of the translation hole 233 matches the outer diameter of the insertion post 32, and their outer circumferences form a tight fit, restricting the radial displacement of the insertion post 32 and keeping the two sheet pile bodies 1 in a parallel posture. During subsequent driving operations, the cooperation between the translation hole 233 and the insertion post 32 continuously maintains the relative positional accuracy of the two, preventing external interference such as water flow and vibration from causing pile displacement and ensuring the stability of the splicing posture during driving.

[0036] During this process, since the insertion post 32 is fixed on the insertion seat 31, and the volume and radial dimension of the insertion seat 31 are usually larger than the insertion post 32, if the connecting sleeve 22 is a closed cylindrical structure, when the insertion post 32 is inserted into the connecting hole 23 and lowered to a certain depth, the insertion seat 31 will abut against the top or outer wall of the connecting sleeve 22, causing the insertion post 32 to be unable to continue to descend. By opening a slot 24 that communicates with the connecting hole 23, a special clearance space is provided for the insertion seat 31, so that it can be smoothly embedded into the slot 24 along with the insertion post 32, thereby ensuring that the insertion post 32 can be completely lowered to the design depth. Only when the insertion seat 31 smoothly enters the slot 24 to make clearance can the sides of the two sheet pile bodies 1 achieve a physical seamless fit. This ensures that the insertion column 32 can be fully inserted into the translation hole 233 section. During the subsequent pile driving process, the two sheet piles can strictly maintain a parallel state, effectively preventing the pile body from tilting or relatively shifting due to the obstruction of the insertion seat 31, and maintaining the overall verticality and assembly accuracy of the cofferdam.

[0037] After the main body 1 of the assembled sheet pile is driven into place, the axial constraint of the abutment pin 335 in the assembly hole 332 on the moving frame 334 is released by screwing. The elastic element 333 in the movable groove 331 releases elastic potential energy and pushes the moving frame 334 to slide axially along the insertion column 32. The rack 3342 in the clearance groove 3341 is engaged with the gear ring 3371 on the outer periphery of the locking block 337. The axial movement of the moving frame 334 is converted into the rotational movement of the locking block 337 through the meshing transmission of the gear and gear ring 3371. This causes the locking block 337 to rotate outward from the movable hole 336 around its own central axis and be inserted into the locking hole 338 on the inner wall of the translation hole 233, forming a mechanical locking structure and realizing the rapid locking and fixing of adjacent sheet pile main bodies 1.

[0038] During the operation of the constraint mechanism 33, the movable frame 334 needs to slide linearly along the axial direction of the plug post 32 under the drive of the elastic element 333, while the locking block 337 rotates around its own axis. The clearance groove 3341 opened in the movable frame 334 can provide space for the locking block 337, so that the movable frame 334 can smoothly pass through or cover the area of ​​the locking block 337 when sliding back and forth, effectively eliminating mechanical interference and jamming during the movement.

[0039] It is worth noting that in the initial state before the sheet pile body 1 is lowered and driven, the constraint mechanism 33 is in a pre-tightened and retracted state. Specifically, the abutment pin 335 is located in the initial screw-lock position of the assembly hole 332, applying the maximum axial clamping force to the moving frame 334, forcing the moving frame 334 to be compressed and retracted to the limit retracted position of the movable groove 331. At this time, the elastic element 333 in the movable groove 331 bears the maximum compressive load, and this compression is strictly controlled within the allowable deformation range of the elastic element 333, ensuring that the elastic material does not undergo plastic yielding or fatigue damage. Driven by the moving frame 334, the rack 3342 meshes with the gear ring 3371, and the locking block 337 is completely retracted and concealed inside the movable hole 336 of the insertion post 32, realizing the physical concealment of the constraint mechanism 33. Since the plug pin 32 needs to pass through the large-diameter mating hole 231, the conical correction hole 232, and the fitting translation hole 233 in sequence, the locking block 337 is completely housed in the movable hole 336, so that when the plug pin 32 enters the connection hole 23, its outer peripheral surface remains smooth and continuous, avoiding mechanical collision, scratching or jamming between the protruding locking block 337 and the inner wall or the edge of the hole of the mating sleeve 22, ensuring the smooth execution of the conical surface guidance and self-centering process.

[0040] When the constraint mechanism 33 performs the locking action, the locking block 337 rotates and embeds into the locking hole 338 on the inner wall of the translation hole 233. At this time, the magnetic component 3372 assembled at the end of the locking block 337 generates a magnetic attraction with the inner wall of the locking hole 338, forming an auxiliary magnetic self-locking constraint to maintain the steady state of the locking mechanism. At the same time, the locking block 337, based on the arc-shaped geometric configuration, and the arc-shaped locking hole 338 with the same mating surface engage with each other, constructing a mechanical barbed interlocking structure inside the mating sleeve 22. This barbed interlocking structure can effectively resist the axial pull-out force and radial displacement disturbance caused by external loads, significantly enhancing the mechanical connection strength and system stability of adjacent sheet pile splicing nodes.

[0041] The locking block 337 of the mechanical barb provides the primary structural locking force, while the magnetic attraction of the magnetic component 3372 serves as the auxiliary holding force. Under dynamic loads such as continuous vibration of construction machinery or impact of water flow, the magnetic attraction can effectively prevent the locking block 337 from rotating slightly or dislodging, ensuring that the mechanical barb is always in the optimal engagement position and avoiding locking failure caused by vibration. At the same time, the arc-shaped barb structure allows the locking block 337 and the locking hole 338 to form a large area of ​​arc surface fit. When the cofferdam is subjected to axial tensile force, the arc-shaped barb can provide strong mechanical pull-out resistance; when subjected to radial disturbance, the arc-shaped mating surface can effectively resist shear force and prevent relative slippage of adjacent piles.

[0042] In the construction of cofferdams for foundation pits, traditional construction methods require the introduction of corner piles at specific angles to achieve zigzag or vertical assembly of adjacent sheet pile bodies 1 for the corner areas of rectangular or irregularly shaped foundation pits. Due to the differences in geometric boundary conditions in different construction areas, the prefabrication angle of the corner piles needs to be customized and matched. This results in a wide variety of prefabricated components, complicated on-site selection, and high difficulty in hoisting, positioning, and driving irregularly shaped corner piles, significantly reducing the construction efficiency of cofferdam assembly.

[0043] In this invention, for the corner splicing of the cofferdam, the circumferential angle of the connecting sleeve 22 can be adjusted to adapt to different corner requirements. The specific process is as follows: Before assembling the main body 1 of the sheet pile, the construction workers, with the help of auxiliary tools, unscrew the locking pin 213 in the mounting hole 212 of the docking seat 21, releasing the locking pin 213 from the locking groove 251 on the adjusting block 25. At this time, the docking sleeve 22 can rotate freely along its own central axis in the docking seat 21. The construction workers rotate the docking sleeve 22 according to the required rotation angle, so that the orientation of the groove 24 matches the insertion direction of the pile body to be spliced. After the angle adjustment is completed, the locking pin 213 is screwed back in and embedded into the corresponding locking groove 251, completing the circumferential locking of the docking sleeve 22.

[0044] In the above process, corner assembly only requires three basic actions—loosening, rotating, and tightening—using auxiliary tools to complete the attitude switching and locking of the docking sleeve 22. The entire process requires no disassembly of the main structural components or replacement of non-standard corner piles, greatly reducing on-site construction difficulty, significantly shortening the operation time at the corner, and improving the overall closure efficiency of the cofferdam. Furthermore, since the outer circumferential surface of the adjusting block 25 is provided with multiple locking grooves 251 arranged in a circular array along the central axis, the connecting sleeve 22 can be deflected at multiple angles after unlocking. This allows the standard sheet pile body 1 to flexibly match the corner requirements of foundation pits with different geometric shapes, giving the cofferdam structure a strong terrain adaptability. At the same time, after the angle adjustment is completed, the locking pin 213 is screwed back into and embedded in the corresponding locking groove 251, forming a mechanical rigid fitting constraint. This physical locking structure can effectively resist the torque and circumferential disturbances caused by water flow and mechanical vibration during the subsequent insertion and lowering process, ensuring that the connecting sleeve 22 will not deflect or loosen during piling and service, thus guaranteeing the high precision and high reliability of the splicing node at the corner.

[0045] Please see Figure 10 Another aspect of the present invention provides a construction method for modular rapid assembly of steel sheet pile cofferdams, comprising the following steps: S1. Loosen the locking pin 213 of the docking seat 21 to release the constraint of the adjusting block 25, rotate the docking sleeve 22 to the target angle, and screw in the locking pin 213 so that the docking sleeve 22 completes mechanical locking; S2. Hoist the sheet pile to be assembled to the side of the driven pile body, align the insertion column 32 with the docking hole 231 of the docking sleeve 22 and lower it. The insertion column 32 contacts the docking hole 231, the correction hole 232 and the translation hole 233 in sequence. When the insertion column 32 reaches the correction hole 232, the conical surface of the correction hole 232 corrects the position of the insertion column 32 until the insertion column 32 moves to the bottom of the translation hole 233, and the initial assembly of the sheet pile body 1 is completed. S3. After the sheet pile body 1 is driven into place, the abutment pin 335 is screwed to release the axial constraint. The elastic element 333 drives the moving frame 334 to slide in the movable groove 331. Through the meshing of the rack 3342 and the gear ring 3371, the locking block 337 rotates out from the movable hole 336 and is embedded in the locking hole 338 to form an interlock, thus completing the locking between the sheet pile bodies 1. S4. Repeat S1 to S3 to assemble the next set of sheet pile main body 1.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular, rapid-assembly steel sheet pile cofferdam, characterized in that, include: A sheet pile body (1) is provided with a docking assembly (2) on one side and a plug-in assembly (3) on the other side. The docking assembly (2) includes a docking seat (21) fixedly installed on the outside of the sheet pile body (1), and a docking sleeve (22) is rotatably installed on the outside of the docking seat (21). The top of the docking sleeve (22) is provided with a connection hole (23). The connection hole (23) includes an integrally formed docking hole (231), a correction hole (232) and a translation hole (233). The correction hole (232) is tapered. The plug assembly (3) includes a plug seat (31) fixedly installed on the outside of the sheet pile body (1), and a plug post (32) is fixedly installed on the outside of the plug seat (31), and the bottom of the plug post (32) is provided with an abutment part (321). The insertion post (32) is equipped with a constraint mechanism (33) for locking the docking sleeve (22).

2. The modular rapid assembly steel sheet pile cofferdam according to claim 1, characterized in that: The diameter of the mating hole (231) is larger than the diameter of the translation hole (233), and the inner wall of the translation hole (233) is in contact with the outer circumferential surface of the plug (32).

3. The modular rapid assembly steel sheet pile cofferdam according to claim 1, characterized in that: The outer side of the docking sleeve (22) is also provided with a slot (24) that communicates with the connecting hole (23). An adjusting block (25) is fixedly installed on the outer side of the docking sleeve (22). There are two adjusting blocks (25) and they are symmetrically distributed along the center plane of the docking sleeve (22). A locking groove (251) is provided on the outer circumferential surface of the adjusting block (25). There are multiple locking grooves (251) and they are arranged in a circular array along the central axis of the adjusting block (25).

4. A modular, rapid-assembly steel sheet pile cofferdam according to claim 3, characterized in that: The docking seat (21) has an annular groove (211) that fits against the outer side of the adjusting block (25) inside. The docking seat (21) is equipped with a locking pin (213) that fits against the inner wall of the locking groove (251) through a mounting hole (212) on its outer side. The mounting hole (212) and the annular groove (211) are connected.

5. A modular, rapid-assembly steel sheet pile cofferdam according to claim 4, characterized in that: The constraint mechanism (33) includes a movable groove (331) formed in the plug-in seat (31) and extending into the plug-in post (32). The plug-in seat (31) has an assembly hole (332) communicating with the movable groove (331). The movable groove (331) is fitted with a movable frame (334) by an elastic element (333) provided inside it. The assembly hole (332) is fitted with an abutment pin (335) that fits against the top of the movable frame (334).

6. A modular, rapid-assembly steel sheet pile cofferdam according to claim 5, characterized in that: The outer side of the plug (32) is provided with a movable hole (336) that communicates with the movable groove (331), and the movable hole (336) is provided in multiple arrays along the central axis of the plug (32). A locking block (337) is rotatably connected in the movable hole (336), and a locking hole (338) that fits against the outer side of the locking block (337) is provided in the translation hole (233).

7. A modular, rapid-assembly steel sheet pile cofferdam according to claim 6, characterized in that: A toothed ring (3371) is fixedly installed on the outer side of the locking block (337), and a magnetic component (3372) is fixedly installed at the end of the locking block (337), and the magnetic component (3372) is magnetically connected to the inner wall of the locking hole (338).

8. A modular, rapid-assembly steel sheet pile cofferdam according to claim 7, characterized in that: The movable frame (334) has a clearance groove (3341) inside, and the clearance groove (3341) and the locking block (337) are distributed in a one-to-one correspondence. A rack (3342) that meshes with the gear ring (3371) is fixedly installed in the clearance groove (3341).

9. The construction method for a modular rapid assembly steel sheet pile cofferdam according to claim 8, characterized in that: Includes the following steps: S1. Loosen the locking pin (213) of the docking seat (21) to release the constraint of the adjusting block (25), rotate the docking sleeve (22) to the target angle, and screw in the locking pin (213) so that the docking sleeve (22) completes mechanical locking; S2. Hoist the sheet pile to be assembled to the side of the driven pile body, align the insertion column (32) with the docking hole (231) of the docking sleeve (22) and lower it. The insertion column (32) contacts the docking hole (231), the correction hole (232) and the translation hole (233) in sequence. When the insertion column (32) reaches the correction hole (232), the cone surface of the correction hole (232) corrects the position of the insertion column (32) until the insertion column (32) moves to the bottom of the translation hole (233) to complete the preliminary assembly of the sheet pile body (1). S3. After the sheet pile body (1) is driven into place, the abutment pin (335) is screwed to release the axial constraint. The elastic element (333) drives the moving frame (334) to slide in the movable groove (331). Through the meshing transmission of the rack (3342) and the gear ring (3371), the locking block (337) rotates out from the movable hole (336) and is embedded in the locking hole (338) to form an interlock, thus completing the locking between the sheet pile bodies (1). S4. Repeat S1 to S3 to assemble the next set of sheet pile main body (1).

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