Steel caisson hoisting device for steel caisson cofferdam

Abstract

The application discloses a steel caisson hoisting device for steel caisson cofferdams, and relates to the technical field of steel wire rope lifting belts, which comprises a floating crane, a hoisting machine and a steel wire rope lifting belt, the hoisting machine is installed on the floating crane, the steel caisson is hoisted through the steel wire rope lifting belt, the steel wire rope lifting belt is composed of three parallelly arranged steel wire ropes, and a plurality of protective sleeves are arranged outside the steel wire rope lifting belt, the protective sleeves are used for protecting the steel wire rope lifting belt, and when the tensile cross section of the steel wire rope lifting belt is reduced, the protective sleeves slide downwards along the steel wire rope lifting belt and gather together, so that the steel wire rope lifting belt is prevented from suddenly breaking and causing harm to the workers; the protective sleeve comprises a first cover plate and a second cover plate, three first installation grooves are formed in the second cover plate, the first installation grooves are of the same curvature as the steel wire rope lifting belt, and are used for bearing part of the steel wire rope lifting belt, a fixing mechanism is arranged in the first cover plate, the fixing mechanism is used for bearing another part of the steel wire rope lifting belt, and the steel wire rope lifting belt is extruded in the direction of the first installation grooves, so that the steel wire rope lifting belt is fixedly installed in the first cover plate and the second cover plate.

Description

Technical Field

[0001] This invention relates to the field of wire rope sling technology, and in particular to a steel caisson hoisting device for steel caisson cofferdams. Background Technology

[0002] The Huangbudun Emergency Flood Control Project (Permanent Flood Control) is located in Huangbudun, Liangxi District, Wuxi City, a World Cultural Heritage site along the Grand Canal. This project includes flood control works, building renovation, flood wall construction, landscaping, and lighting. To minimize the impact on the existing Huangbudun structure, maintain its original appearance after renovation, reduce the influence of external factors on the revetment, and improve the safety factor of the pier, steel caisson cofferdams will be constructed around Huangbudun to ensure the successful implementation of the renovation project.

[0003] The construction sequence of the steel caisson cofferdam is as follows: steel caisson cofferdam fabrication - steel caisson cofferdam transportation - steel caisson cofferdam location layout - dredging and leveling of the steel caisson cofferdam location - steel caisson cofferdam hoisting - steel caisson cofferdam sinking - installation of locking fasteners - horizontal connection of steel caissons to form a cofferdam - dewatering and dredging inside the steel caisson cofferdam - filling soil inside the steel caisson cofferdam - dewatering the steel caisson cofferdam - repair of the revetment around Huangbudun - filling soil inside the steel caisson cofferdam - dismantling of the steel caisson cofferdam. Among these, the hoisting of the steel caisson cofferdam is a very important step, as it determines whether the steel caisson cofferdam is installed in place and provides a guarantee for the safety of subsequent operations.

[0004] This project uses a floating crane to lift the steel caisson cofferdam. The floating crane uses steel wire ropes to lift the steel caisson cofferdam. During the lifting process, the steel wire rope may break. The broken rope will suddenly contract under the tension, which may cause injury to nearby workers.

[0005] Based on this, the present invention designs a steel caisson hoisting device for steel caisson cofferdams to solve the above problems. Summary of the Invention

[0006] Technical problems to be solved:

[0007] To address the shortcomings of existing technologies, this invention provides a steel caisson hoisting device for steel caisson cofferdams, thereby solving the problem mentioned in the background art where floating cranes use wire ropes to hoist steel caisson cofferdams, and the wire ropes may break during the hoisting process. The broken rope body will suddenly contract under the action of tension, which may cause injury to nearby workers.

[0008] Technical solution:

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A steel caisson hoisting device for steel caisson cofferdams includes a floating crane, a hoisting machine, and a wire rope sling. The hoisting machine is mounted on the floating crane and hoists the steel caisson via the wire rope sling. The wire rope sling consists of three parallel wire ropes and is covered with several protective sleeves. The protective sleeves protect the wire rope sling and, when the tensile cross-section of the wire rope sling decreases, slide down and accumulate along the wire rope sling to prevent injury to workers in the event of accidental breakage of the wire rope sling.

[0011] The protective sleeve includes a first cover plate and a second cover plate, which are fixedly connected. The wire rope sling is inserted into the first cover plate and the second cover plate. The second cover plate has three first mounting grooves, which have the same curvature as the wire rope sling and are used to support part of the wire rope sling. The first cover plate has a fixing mechanism, which supports another part of the wire rope sling and presses the wire rope sling towards the first mounting groove so that the wire rope sling is fixedly installed in the first cover plate and the second cover plate.

[0012] In one possible implementation, a movable cavity is formed within the first cover plate, and limiting grooves are formed on both sides of the movable cavity. The fixing mechanism includes a screw, a drive block, a handle, a mounting base, and a second mounting groove, wherein: the screw is threadedly connected to the first cover plate and extends into the movable cavity; the drive block is rotatably connected to the end of the screw located in the movable cavity via a bearing and is used to drive the mounting base; the handle is fixedly installed at the end of the screw away from the drive block and is used to drive the screw; the mounting base is slidably connected within the movable cavity and is fixedly installed on the side of the drive block away from the screw; three second mounting grooves are provided and are formed on the side of the mounting base away from the drive block, and the second mounting grooves have the same curvature as the wire rope sling; the mounting base carries another part of the wire rope sling through the second mounting grooves and presses the wire rope sling towards the first mounting groove, so that the wire rope sling is fixedly installed within the first and second cover plates.

[0013] In one possible implementation, the fixing mechanism further includes threaded holes, screws, and fixing blocks, wherein: a plurality of threaded holes are provided and are evenly distributed along the edge of the rotating handle; the screw is threaded into any one of the threaded holes; the fixing block is fixedly mounted on the first cover plate and is located directly below any one of the threaded holes; the screw passes through any one of the threaded holes and is screwed into the fixing block, thereby fixing the steel wire rope sling by fixing the rotating handle.

[0014] In one possible implementation, each of the first and second mounting slots is provided with a plurality of moving mechanisms. When the cross-sectional area of ​​the wire rope sling under tension decreases, the moving mechanisms extend out of the first and second mounting slots and roll into contact with the wire rope sling, so that the protective sleeve can slide down and gather along the wire rope sling.

[0015] In one possible implementation, the moving mechanism includes a lifting plate, a bracket, a rotating shaft, and a rotating wheel, wherein: the lifting plate is slidably connected in the inner cavity of the second cover plate and the mounting base; the bracket is fixedly installed on both sides of the lifting plate; the rotating shaft is rotatably connected between the two brackets through bearings; and the rotating wheel is sleeved on the rotating shaft and can roll along the wire rope sling.

[0016] In one possible implementation, the moving mechanism further includes a spring installed between the lifting plate and the bottom surface of the inner cavity of the second cover plate and the mounting base. The spring is used to drive the wheel to extend out of the inner cavity of the second cover plate and the mounting base and roll in connection with the wire rope sling when the tensile cross-section of the wire rope sling decreases. The surface of the wheel is provided with an arc-shaped surface, which has the same curvature as the wire rope sling.

[0017] In one possible implementation, the length of the lifting plate is greater than the inner cavity outlet of the second cover plate and the mounting base to prevent the lifting plate from detaching from the inner cavity; the mounting base is provided with limiting blocks on both sides, and the limiting blocks are slidably connected in the limiting groove.

[0018] In one possible implementation, a plurality of positioning rods are installed inside the movable cavity, and the positioning rods are inserted into the upper surface of the mounting base to maintain the stability of the mounting base during the sliding process; a first connecting block is provided on both sides of the outer wall of the first cover plate, and a second connecting block is provided on both sides of the outer wall of the second cover plate, the first connecting block and the second connecting block correspond to each other, and bolts pass through the first connecting block and the second connecting block to fix the first cover plate and the second cover plate together.

[0019] In one possible implementation, a polyurethane layer one is applied to the first mounting groove and the second mounting groove, and a polyurethane layer two is also applied to the wire rope sling, with the polyurethane layer one in contact with the polyurethane layer two.

[0020] Beneficial effects:

[0021] In this invention, the floating crane vessel lifts the steel caisson using wire rope slings and places it in a suitable position. Each wire rope sling needs to withstand a tensile force of not less than 1.36T, thus placing extremely high demands on the wire rope slings. However, after prolonged use, the wire rope slings may inevitably break due to accidents. In this case, the protective sleeve can protect the workers. When the tensile cross-section of the wire rope sling decreases, the sleeve slides down and gathers along the wire rope sling to prevent injury to workers in the event of an accidental breakage of the wire rope sling.

[0022] In this invention, the rotating handle drives the screw to spiral forward, and the screw drives the drive block through the bearing. The drive block drives the mounting seat to slide along the moving cavity. The mounting seat squeezes the wire rope sling towards the first mounting groove through the second mounting groove, so as to fix the wire rope sling in the first mounting groove and the second mounting groove, thereby achieving the purpose of fixing the wire rope sling in the first cover plate and the second cover plate.

[0023] In this invention, when the cross-sectional area of ​​the wire rope sling is reduced under tension, the wheel loses the compressive force of the wire rope sling. At this time, the spring drives the bracket, the rotating shaft and the wheel to extend out of the first and second mounting slots through the lifting plate, and makes the wheel close to the wire rope sling with the reduced cross-sectional area again. The wheel rolls along the wire rope sling, so as to achieve the purpose of the protective sleeve sliding down and gathering along the wire rope sling. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial three-dimensional structural diagram of the present invention;

[0026] Figure 3 This is a partial cross-sectional view of the present invention;

[0027] Figure 4 This is a three-dimensional structural diagram of the first cover plate in this invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the second cover plate in this invention;

[0029] Figure 6 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 7 for Figure 5 Enlarged view of point B in the middle.

[0031] Legend: 1. Floating crane; 2. Wire rope sling; 3. Steel caisson; 4. Protective sleeve; 41. First cover plate; 42. Second cover plate; 43. First connecting block; 44. Moving cavity; 45. Limiting groove; 46. Positioning rod; 47. Second connecting block; 48. First mounting groove; 5. Fixing mechanism; 51. Screw; 52. Drive block; 53. Rotating handle; 54. Mounting base; 55. Second mounting groove; 56. Limiting block; 57. Threaded hole; 58. Screw; 59. Fixing block; 6. Moving mechanism; 61. Lifting plate; 62. Bracket; 63. Rotating shaft; 64. Rotating wheel; 65. Arc-shaped surface; 66. Spring. Detailed Implementation

[0032] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0033] Please refer to the steel caisson hoisting device for steel caisson cofferdams. Figures 1-7 The system includes a floating crane vessel 1, a lifting machine, and a wire rope sling 2. The lifting machine is installed on the floating crane vessel 1 and lifts the steel caisson 3 using the wire rope sling 2. The wire rope sling 2 consists of three parallel wire ropes and is covered with several protective sleeves 4. The protective sleeves 4 are used to protect the wire rope sling 2 and, when the cross-sectional area of ​​the wire rope sling 2 decreases under tension, they slide down and gather along the wire rope sling 2 to prevent injury to workers in the event of an accidental breakage of the wire rope sling 2.

[0034] Through the above technical solution, in this invention, the floating crane 1 lifts the steel caisson 3 by means of steel wire rope slings 2 and places the steel caisson 3 in a suitable position; each steel wire rope sling 2 needs to withstand a tensile force of not less than 1.36T, so the requirements for the steel wire rope sling 2 are extremely high; however, after long-term use, the steel wire rope sling 2 will inevitably break due to accidents. At this time, the protective sleeve 4 can protect the staff. When the cross-sectional area of ​​the steel wire rope sling 2 under tension decreases, it slides down along the steel wire rope sling 2 and gathers, so as to prevent the steel wire rope sling 2 from accidentally breaking and endangering the staff.

[0035] In some examples, refer to Figure 1-7 As shown, the protective sleeve 4 includes a first cover plate 41 and a second cover plate 42, which are fixedly connected. The wire rope sling 2 is inserted into the first cover plate 41 and the second cover plate 42. The outer walls of the first cover plate 41 are provided with first connecting blocks 43 on both sides, and the outer walls of the second cover plate 42 are provided with second connecting blocks 47 on both sides. The first connecting blocks 43 and the second connecting blocks 47 correspond to each other. Bolts pass through the first connecting blocks 43 and the second connecting blocks 47 to fix the first cover plate 41 and the second cover plate 42 together.

[0036] Through the above technical solution, the first connecting block 43 and the second connecting block 47 are connected together, and then bolts are used to fix the first connecting block 43 and the second connecting block 47 together, so as to fix the first cover plate 41 and the second cover plate 42 together, thereby achieving the purpose of fixing the protective sleeve 4 to the wire rope sling 2.

[0037] In some examples, refer to Figure 1-7 As shown, the second cover plate 42 has three first mounting grooves 48. The first mounting grooves 48 have the same curvature as the wire rope sling 2 and are used to support part of the wire rope sling 2. The first cover plate 41 has a fixing mechanism 5. The fixing mechanism 5 is used to support another part of the wire rope sling 2 and to squeeze the wire rope sling 2 towards the first mounting grooves 48 so that the wire rope sling 2 is fixedly installed in the first cover plate 41 and the second cover plate 42.

[0038] Through the above technical solution, in this invention, a portion of the wire rope sling 2 is placed in the first mounting groove 48 on the second cover plate 42, and the fixing mechanism 5 is driven to squeeze the wire rope sling 2 in the direction of the first mounting groove 48, so as to firmly install the wire rope sling 2 in the first cover plate 41 and the second cover plate 42.

[0039] In some examples, refer to Figure 1-7 As shown, a movable cavity 44 is formed inside the first cover plate 41, and limit grooves 45 are formed on both sides of the movable cavity 44. The fixing mechanism 5 includes a screw 51, a drive block 52, a handle 53, a mounting base 54, and a second mounting groove 55. Specifically: the screw 51 is threaded onto the first cover plate 41 and extends into the movable cavity 44; the drive block 52 is rotatably connected to the end of the screw 51 located in the movable cavity 44 via a bearing and is used to drive the mounting base 54; the handle 53 is fixedly installed on the end of the screw 51 away from the drive block 52 and is used to... A drive screw 51 is slidably connected to the moving cavity 44 and fixedly installed on the side of the drive block 52 away from the screw 51. Three second mounting grooves 55 are provided and opened on the side of the mounting base 54 away from the drive block 52. The second mounting grooves 55 have the same curvature as the wire rope sling 2. The mounting base 54 carries another part of the wire rope sling 2 through the second mounting grooves 55 and presses the wire rope sling 2 towards the first mounting groove 48 so that the wire rope sling 2 is fixedly installed in the first cover plate 41 and the second cover plate 42.

[0040] Through the above technical solution, the mounting base 54 in the fixing mechanism 5 of the present invention has a second mounting groove 55, which is used to cover another part of the wire rope sling 2; the rotating handle 53 drives the screw 51 to spiral forward, and the screw 51 drives the driving block 52 through the bearing. The driving block 52 drives the mounting base 54 to slide along the moving cavity 44. The mounting base 54 squeezes the wire rope sling 2 towards the first mounting groove 48 through the second mounting groove 55, so as to fix the wire rope sling 2 in the first mounting groove 48 and the second mounting groove 55, thereby achieving the purpose of fixing the wire rope sling 2 in the first cover plate 41 and the second cover plate 42; the bearing is provided so that when the screw 51 spirals forward, the mounting base 54 is driven to slide along the moving cavity 44 through the driving block 52, and there will be no rotation.

[0041] In some examples, refer to Figure 1-7 As shown, polyurethane layer one is applied to the first mounting groove 48 and the second mounting groove 55, and polyurethane layer two is also applied to the wire rope sling 2. Polyurethane layer one is in contact with polyurethane layer two.

[0042] Through the above technical solution, the contact between polyurethane layer one and polyurethane layer two in this invention helps to increase the friction between the protective sleeve 4 and the wire rope sling 2, and prevents the polyurethane on the wire rope sling 2 from being worn due to the action of heavy objects.

[0043] In some examples, refer to Figure 1-7 As shown, the mounting base 54 is provided with limiting blocks 56 on both sides, and the limiting blocks 56 are slidably connected in the limiting groove 45; a number of positioning rods 46 are installed in the moving cavity 44, and the positioning rods 46 are inserted into the upper surface of the mounting base 54 to maintain the stability of the mounting base 54 during the sliding process.

[0044] Through the above technical solution, the setting of the limiting block 56 slidingly connected in the limiting groove 45 in the present invention limits the sliding range of the mounting seat 54 and prevents the mounting seat 54 from leaving the moving cavity 44; the setting of the positioning rod 46 inserted into the upper surface of the mounting seat 54 is conducive to maintaining the stability of the mounting seat 54 during the sliding process along the moving cavity 44 and is conducive to fixing the wire rope sling 2.

[0045] In some examples, refer to Figure 1-7 As shown, the fixing mechanism 5 also includes threaded holes 57, screws 58 and fixing blocks 59, wherein: several threaded holes 57 are provided and are evenly distributed on the edge of the handle 53; screws 58 are threaded into any of the threaded holes 57; fixing blocks 59 are fixedly installed on the first cover plate 41 and are located directly below any of the threaded holes 57; screws 58 pass through any of the threaded holes 57 and are screwed into the fixing blocks 59, thereby fixing the wire rope sling 2 by fixing the handle 53.

[0046] Through the above technical solution, when the handle 53 is rotated to the position, the screw 58 passes through the threaded hole 57 corresponding to the fixing block 59 and is screwed into the fixing block 59 to fix the handle 53, so as to prevent the screw 51 from reversing and affecting the fixing of the protective sleeve 4 to the wire rope sling 2; the threaded hole 57 is provided with several, so as to facilitate the adjustment of the rotation position of the handle 53 according to the size of the wire rope sling 2, so as to fix the handle 53 at different rotation positions.

[0047] The process of securing the protective sleeve 4 to the wire rope sling 2:

[0048] First, a portion of the wire rope sling 2 is placed into the first mounting groove 48 on the second cover plate 42. Next, the first connecting block 43 and the second connecting block 47 are joined together, and then bolts are used to fix the first connecting block 43 and the second connecting block 47 together. Then, the screw 51 is driven to spiral forward by the rotating handle 53. Next, the screw 51 drives the mounting seat 54 to slide along the moving cavity 44 towards the second cover plate 42 through the driving block 52. Then, the mounting seat 54 squeezes the wire rope sling 2 through the second mounting groove 55, fixing the wire rope sling 2 in the first mounting groove 48 and the second mounting groove 55. After the rotating handle 53 is rotated into place, finally, the screw 58 is passed through the threaded hole 57 corresponding to the fixing block 59 and screwed into the fixing block 59 to fix the rotating handle 53, thus achieving the purpose of fixing the wire rope sling 2 in the first cover plate 41 and the second cover plate 42.

[0049] In some examples, refer to Figure 1-7 As shown, the first mounting groove 48 and the second mounting groove 55 are each provided with a number of moving mechanisms 6. When the cross-sectional area of ​​the wire rope sling 2 is reduced by tension, the moving mechanism 6 extends out of the first mounting groove 48 and the second mounting groove 55 and rolls with the wire rope sling 2 so that the protective sleeve 4 can slide down and gather along the wire rope sling 2 to prevent the wire rope sling 2 from harming the workers.

[0050] Through the above technical solution, when the cross-sectional area of ​​the wire rope sling 2 under tension decreases, the moving mechanism 6 installed in the first mounting groove 48 and the second mounting groove 55 will extend out of the first mounting groove 48 and the second mounting groove 55 and roll along the wire rope sling 2 to achieve the purpose of the protective sleeve 4 sliding down and gathering along the wire rope sling 2 to prevent the wire rope sling 2 from suddenly contracting under the action of tension and causing injury to nearby workers.

[0051] In some examples, refer to Figure 1-7As shown, the moving mechanism 6 includes a lifting plate 61, a bracket 62, a rotating shaft 63, and a rotating wheel 64. The lifting plate 61 is slidably connected in the inner cavity of the second cover plate 42 and the mounting base 54. The bracket 62 is fixedly installed on both sides of the lifting plate 61. The rotating shaft 63 is rotatably connected between the two brackets 62 through a bearing. The rotating wheel 64 is sleeved on the rotating shaft 63 and can roll along the wire rope sling 2.

[0052] Through the above technical solution, in this invention, the rotating wheel 64 is rotatably connected to the bracket 62 via the rotating shaft 63. When the rotating wheel 64 extends out of the first mounting groove 48 and the second mounting groove 55, the rotating wheel 64 will roll along the wire rope sling 2 to achieve the purpose of the protective sleeve 4 sliding down and gathering along the wire rope sling 2; the lifting plate 61 is used to support the bracket 62, the rotating shaft 63 and the rotating wheel 64.

[0053] In some examples, refer to Figure 1-7 As shown, the moving mechanism 6 also includes a spring 66, which is installed between the lifting plate 61 and the bottom surface of the inner cavity of the second cover plate 42 and the mounting base 54. The spring 66 is used to drive the rotating wheel 64 to extend out of the inner cavity of the second cover plate 42 and the mounting base 54 and roll in connection with the wire rope sling 2 when the cross-sectional area of ​​the wire rope sling 2 is reduced under tension. The rotating wheel 64 has an arc-shaped surface 65 on its surface, which has the same curvature as the wire rope sling 2.

[0054] Through the above technical solution, when the cross-sectional area of ​​the wire rope sling 2 decreases under tension, the wheel 64 loses the compressive force of the wire rope sling 2. At this time, the spring 66 drives the bracket 62, the shaft 63 and the wheel 64 to extend out of the first mounting groove 48 and the second mounting groove 55 through the lifting plate 61, and makes the wheel 64 close to the wire rope sling 2 with the reduced cross-section again. The wheel 64 rolls along the wire rope sling 2, so as to realize the purpose of the protective sleeve 4 sliding down and gathering along the wire rope sling 2. The arc surface 65 is set with the same arc as the wire rope sling 2, which makes it easy for the wheel 64 to roll smoothly along the wire rope sling 2.

[0055] In some examples, refer to Figure 1-7 As shown, the length of the lifting plate 61 is greater than the inner cavity outlet of the second cover plate 42 and the mounting base 54 to prevent the lifting plate 61 from detaching from the inner cavity.

[0056] Through the above technical solution, the length of the lifting plate 61 in this invention is greater than the inner cavity outlet of the second cover plate 42 and the mounting base 54, which can prevent the lifting plate 61 from detaching from the inner cavity and ensure the stability of the moving mechanism 6.

[0057] The sliding process of the protective sleeve 4 along the wire rope sling 2:

[0058] When the cross-sectional area of ​​the wire rope sling 2 decreases under tension, the wheel 64 loses the compressive force of the wire rope sling 2. First, the spring 66 drives the bracket 62, the shaft 63 and the wheel 64 to extend out of the first mounting groove 48 and the second mounting groove 55 through the lifting plate 61. Then, the wheel 64 presses against the wire rope sling 2 with the reduced cross-section and rolls along the wire rope sling 2 through the arc surface 65, so as to achieve the purpose of the protective sleeve 4 sliding down and gathering along the wire rope sling 2.

[0059] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A steel caisson hoisting device for steel caisson cofferdams, comprising a floating crane (1), a hoisting machine, and a wire rope sling (2), wherein the hoisting machine is installed on the floating crane (1) and hoists the steel caisson (3) via the wire rope sling (2), characterized in that: The wire rope sling (2) is composed of three parallel wire ropes and is covered with several protective sleeves (4). The protective sleeves (4) are used to protect the wire rope sling (2) and, when the cross-sectional area of ​​the wire rope sling (2) is reduced under tension, they slide down and gather along the wire rope sling (2) to prevent the wire rope sling (2) from accidentally breaking and endangering the workers. The protective sleeve (4) includes a first cover plate (41) and a second cover plate (42). The first cover plate (41) and the second cover plate (42) are fixedly connected, and the wire rope sling (2) is inserted into the first cover plate (41) and the second cover plate (42). The second cover plate (42) has three first mounting grooves (48). The first mounting grooves (48) have the same curvature as the wire rope sling (2) and are used to support part of the wire rope sling (2). The first cover plate (41) has a fixing mechanism (5). The fixing mechanism (5) is used to support another part of the wire rope sling (2) and to squeeze the wire rope sling (2) towards the first mounting groove (48) so that the wire rope sling (2) is fixedly installed in the first cover plate (41) and the second cover plate (42). The fixing mechanism (5) includes a mounting base (54) and a second mounting groove (55). The mounting base (54) carries another part of the wire rope sling (2) through the second mounting groove (55) and squeezes the wire rope sling (2) towards the first mounting groove (48) so that the wire rope sling (2) is fixedly installed in the first cover plate (41) and the second cover plate (42). The first mounting groove (48) and the second mounting groove (55) are each provided with a plurality of moving mechanisms (6). When the cross-sectional area of ​​the wire rope sling (2) is reduced under tension, the moving mechanism (6) extends out of the first mounting groove (48) and the second mounting groove (55) and rolls with the wire rope sling (2) so that the protective sleeve (4) slides down and gathers along the wire rope sling (2). The moving mechanism (6) includes a lifting plate (61), a bracket (62), a rotating shaft (63), and a rotating wheel (64), wherein: The lifting plate (61) is slidably connected in the inner cavity of the second cover plate (42) and the mounting base (54); The bracket (62) is fixedly installed on both sides of the lifting plate (61); The rotating shaft (63) is rotatably connected between the two brackets (62) via bearings; The wheel (64) is fitted on the shaft (63) and can roll along the wire rope sling (2); The moving mechanism (6) also includes a spring (66), which is installed between the lifting plate (61) and the bottom surface of the inner cavity of the second cover plate (42) and the mounting base (54). The spring (66) is used to drive the wheel (64) to extend out of the inner cavity of the second cover plate (42) and the mounting base (54) and roll in connection with the wire rope sling (2) when the tensile cross section of the wire rope sling (2) decreases. The surface of the wheel (64) is provided with an arc-shaped surface (65), and the arc-shaped surface (65) has the same curvature as the wire rope sling (2).

2. The steel caisson hoisting device for steel caisson cofferdams according to claim 1, characterized in that: The first cover plate (41) has a movable cavity (44) inside, and limit grooves (45) are provided on both sides of the movable cavity (44). The fixing mechanism (5) also includes a screw (51), a drive block (52), and a handle (53), wherein: The screw (51) is threaded onto the first cover plate (41) and extends into the movable cavity (44); The drive block (52) is rotatably connected to the end of the screw (51) located in the moving cavity (44) via a bearing, and is used to drive the mounting base (54). The handle (53) is fixedly installed at the end of the screw (51) away from the drive block (52) and is used to drive the screw (51). The mounting base (54) is slidably connected in the movable cavity (44) and fixedly installed on the side of the drive block (52) away from the screw (51); The second mounting slot (55) is provided in three parts and is located on the side of the mounting base (54) away from the drive block (52). The second mounting slot (55) has the same curvature as the wire rope sling (2).

3. The steel caisson hoisting device for steel caisson cofferdams according to claim 2, characterized in that: The fixing mechanism (5) further includes a threaded hole (57), a screw (58), and a fixing block (59), wherein: The threaded holes (57) are provided in several places and are evenly distributed on the edge of the handle (53); The screw (58) is threaded into any of the threaded holes (57), and the fixing block (59) is fixedly installed on the first cover plate (41) and located directly below any of the threaded holes (57); The screw (58) passes through any of the threaded holes (57) and is screwed into the fixing block (59), thereby fixing the wire rope sling (2) by fixing the handle (53).

4. The steel caisson hoisting device for steel caisson cofferdams according to claim 2, characterized in that: The length of the lifting plate (61) is greater than the inner cavity outlet of the second cover plate (42) and the mounting base (54) to prevent the lifting plate (61) from detaching from the inner cavity; The mounting base (54) is provided with limiting blocks (56) on both sides, and the limiting blocks (56) are slidably connected in the limiting groove (45).

5. A steel caisson hoisting device for a steel caisson cofferdam according to claim 2, characterized in that: A plurality of positioning rods (46) are installed in the movable cavity (44). The positioning rods (46) are inserted into the upper surface of the mounting base (54) to maintain the stability of the mounting base (54) during the sliding process. The first cover plate (41) has a first connecting block (43) on both sides of its outer wall, and the second cover plate (42) has a second connecting block (47) on both sides of its outer wall. The first connecting block (43) corresponds to the second connecting block (47), and the bolt passes through the first connecting block (43) and the second connecting block (47) to fix the first cover plate (41) and the second cover plate (42) together.

6. The steel caisson hoisting device for steel caisson cofferdams according to claim 1, characterized in that: The first mounting groove (48) and the second mounting groove (55) are coated with a polyurethane layer one, and the steel wire rope sling (2) is also coated with a polyurethane layer two, and the polyurethane layer one is in contact with the polyurethane layer two.

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