Silt-back-preventing desilting sleeve suitable for wind power steel pipe pile under-mud cutting

Abstract

The invention discloses an anti-silting desilting sleeve suitable for under-mud cutting of a wind power steel pipe pile, and belongs to the technical field of wind power equipment.The anti-silting desilting sleeve comprises a gland and a sleeve body, the gland is arranged at the top of the sleeve body, the sleeve body is a hollow cylinder, the gland is integrally in a circular truncated cone shape, the gland is a hollow circular truncated cone, and a plurality of righting guide frames are arranged on the inner wall of the gland; the righting guide frame is vertically arranged around the inner wall of the gland by a circle. The method is suitable for removing and repairing various pile foundation type structures on the sea, the influence of back silting can be overcome from the source from the multi-angle consideration of economy, applicability and practicability, the desilting workload can be greatly reduced, and meanwhile the operation safety of divers is guaranteed. And great convenience is brought to follow-up cutting work of the wind field under-mud pile.

Description

Technical Field

[0001] The invention relates to the technical field of wind power equipment, and in particular to an anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud. Background Art

[0002] For platforms that are completely dismantled in waters within the territorial sea, the piles and other facilities remaining on the seabed should be cut to 4 meters below the seabed surface; the piles and other facilities remaining outside the territorial sea shall not hinder the use of other major marine functions.

[0003] At present, the removal method of steel pipe piles under mud in oil and gas platforms generally adopts mechanical removal method with relatively less impact on the environment. First, mud removal equipment is used from the top of the jacket to clean the mud surface to below the designed cutting position, and then a special mechanical cutting tool is lowered from the top of the jacket to cut from the designed position under the mud inside the steel pipe pile by mechanical cutting. Fewer resources are required and the cutting speed is faster.

[0004] With the rapid development of offshore wind power around the world, the removal of the jacket or single pile foundation, as an important supporting structure for offshore wind power, has received increasing attention. Due to the special design of the wind turbine jacket foundation, the top of the foundation steel pipe pile is the jacket tip, and the tip is mostly located near the mud surface or even several meters below the mud surface. Even if the upper jacket is cut off first, due to the existence of the jacket grouting section, the internal cutting equipment cannot enter the steel pipe pile from the top. If external cutting is used, according to the specifications, the cutting depth must be 4m below the mud surface. Even if the slope is considered at 1:2, the mud removal depth is 5m and the cutting position is 4m, the mud removal workload will reach 800m 3 , the desilting work of 4 steel pipe piles reached 3200m 3 If the impact of siltation or mud collapse is taken into account, the mud removal workload will exceed 4000m 3 .

[0005] Therefore, when cutting ordinary wind turbine conduit frames, there will be great obstacles whether cutting from the inside or the outside, resulting in many challenges in the mud cutting work during the removal of the wind turbine conduit frame foundation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an anti-silting and mud-removing sleeve. The copper sleeve is suitable for the demolition and repair of various pile-based structures at sea. It can overcome the influence of silt silting when cutting the conductor frame, and can greatly reduce the workload of silting, while ensuring the safety of divers' operations.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a backsilting and mud removal sleeve suitable for cutting under mud of wind power steel pipe piles, comprising a pressure cover and a sleeve body, a pressure cover is arranged on the top of the sleeve body, the sleeve body is a hollow cylinder, the pressure cover is truncated cone as a whole, the pressure cover is a hollow truncated cone, a plurality of straightening guide frames are arranged on the inner wall of the pressure cover, and the straightening guide frames are arranged vertically around the inner wall of the pressure cover.

[0008] Preferably, the pressure cover and the sleeve body are connected by a connecting piece, and at least 4 connecting pieces are provided, and the connecting pieces are evenly distributed around the periphery of the connection between the pressure cover and the sleeve body. The connecting piece includes a turntable, a turntable column, a "T"-shaped plate, a U-shaped groove and a stud. The turntable column is provided at the center of the turntable, and the front end of the turntable column is fixedly connected to the stud. The turntable column is provided on the "T"-shaped plate through a base, and the U-shaped groove is provided on the "T"-shaped plate. A through hole is provided on the U-shaped groove, and the stud passes through the through hole. The bottom of the "T"-shaped plate is welded to the sleeve body, and an external fin plate is welded to the bottom of the pressure cover. A screw hole is provided at the bottom of the external fin plate. The external fin plate is inserted into the U-shaped groove, and the stud is screwed into the screw hole of the external fin plate. The top of the U-shaped groove has two sides open outward to facilitate the insertion of the external fin plate.

[0009] Preferably, the gland is formed by a plurality of vertical steels, and arc brackets are arranged horizontally on the top, bottom and middle for enclosure and reinforcement, and at least four gland lifting ears are evenly distributed around the top of the gland.

[0010] Preferably, a straightening guide frame is arranged on the inner wall of the vertical steel of the pressure cover, and the straightening guide frame is formed by four profiles. The straightening guide frame and the vertical steel of the pressure cover are combined to form an irregular pentagon, and the outer sides of the connection between the two brackets of the straightening guide frame are rounded, and elbow plates are arranged on the inner sides, which play a reinforcing role.

[0011] Preferably, a weight frame is provided on the top of the gland, and a weight block is placed on the weight frame.

[0012] Preferably, a plurality of reinforcing ribs are vertically arranged on the outer surface of the sleeve body, and the reinforcing ribs are evenly distributed on the outer surface of the sleeve body.

[0013] Preferably, a plurality of reinforcing ring plates are laterally arranged on the outer surface of the sleeve body.

[0014] Preferably, the reinforcing ring plate at the bottom end of the sleeve body is beveled inward at an angle of 45° to reduce the mud entry area and reduce the mud entry resistance of the sleeve body.

[0015] Preferably, a plurality of sleeve lifting ears are arranged on the periphery of the top of the sleeve body.

[0016] A method for using an anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud, comprising the following steps: (1) Before entering the water, the gland and sleeve body are installed on the ship deck through the connectors, and a ballast frame of a predetermined tonnage is welded above the gland using a counterweight; (2) The crane connects the gland lifting lugs with a sling to lift the entire sleeve into the water, and lowers it accurately to the steel pipe pile of the structure to be cut; (3) After the weight has entered the mud to a predetermined depth, the diver goes into the water to unscrew the turntable column on the connector. At this time, the sleeve body is separated from the gland, and the crane then lifts the upper part of the sleeve (i.e., the weight and gland) out of the water; (4) Divers clean the mud layer between the steel pipe pile and the sleeve body. After cleaning, a mud removal tool with a reamer is placed into the sleeve to perform underwater mud removal. (5) After the sludge in the sleeve body is removed, the steel pipe pile to be cleaned is exposed, and the underwater cutting equipment is installed until the cutting is completed and the steel pipe pile is lifted off; (6) After the mud removal and cutting work is completed, the sleeve body is lifted from the mud to the water surface by the lifting equipment. After that, the sleeve body is cleaned, maintained and stored for subsequent use.

[0017] By adopting the technical solution of the present invention, the following beneficial effects can be obtained: (1) The anti-silting and desilting sleeve is suitable for soft muddy seabeds in the marine engineering field. It can solve the problem that it is difficult to directly use trenchers to excavate silt in deep water and soft seabeds. Compared with traditional mechanical desilting methods, this method can avoid dependence on large-scale desilting equipment: such as trenchers and grabs, and can adapt to complex and changeable seabed conditions and construction environments.

[0018] (2) Since mud removal is carried out inside the sleeve, the seabed disturbance area is minimized, thereby reducing the impact on the marine ecology. Compared with traditional mechanical dredging and trenching methods, this method is more environmentally friendly and minimizes the impact on the marine soil.

[0019] (3) The desilting sleeve has a low cost, effectively shortens the construction period, and improves the construction efficiency during the short offshore operation window. Due to the quick disassembly design and flexible righting guide, it can be adjusted according to different mud penetration depths and mud qualities, thereby improving construction efficiency, shortening the construction period, and reducing the operating costs of medium and large ships at sea.

[0020] (4) The docking mode and turntable handle structure design effectively reduce the possibility of divers being stuck in the limit position during underwater disassembly, and avoid unnecessary cutting work, thereby improving the safety and reliability of construction. In addition, the design of the straightening guide helps to guide the sleeve sinking path to remain parallel to the pile leg axis, effectively controlling the offset of the tower in the steel pipe pile, and ensuring that the minimum gap between the inner wall of the sleeve and the steel pipe pile is greater than 1m.

[0021] (5) If there is no inner wall support of the sleeve, the slope ratio needs to be verified when excavating 5m deep silt. The slope ratios corresponding to different mud types are not consistent. This causes an exponential increase in the excavation volume. After using the silt-returning sleeve, it can ensure that there is no risk of silt collapse inside, and ensure that the safety personnel can safely install and remove the high-pressure water cutting equipment inside the sleeve. There is no silt or floating mud covering the cutting process, and the entire process is clearly visible.

[0022] (6) This method has wide applicability in the marine engineering field, especially for soft muddy seabed environments. When dealing with pile foundation structures in deep water and soft seabed conditions, traditional excavation methods face great challenges. This problem can be effectively solved by using anti-silting mud removal sleeves. It can assist mud removal equipment to efficiently remove silt and perform pile leg cutting operations, providing a reliable working space for the demolition and repair of offshore wind power and other pile-based offshore structures. Whether in a complex marine environment or under different construction conditions, this method can exert its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following is a brief description of the contents and symbols in the drawings of this specification: Figure 1 This is a schematic diagram of the structure of the desilting sleeve; Figure 2 for Figure 1 The structural diagram of the connecting parts; Figure 3 for Figure 1 Structural schematic diagram of the central straightening guide frame; Figure 4 This is the usage status of this sleeve Figure 1 ; Figure 5 This is the usage status of this sleeve Figure 2 ; The marks in the above figures are: 1. Sleeve body; 2. Gland; 3. Straightening guide frame; 31. Toggle plate; 4. Connector; 41. "T"-shaped plate; 42. Turntable; 43. Turntable column; 44. Stud; 45. U-shaped groove; 46. External fin; 5. Arc bracket; 6. Gland lifting ear; 7. Strengthening rib; 8. Strengthening ring plate; 9. Sleeve lifting ear. DETAILED DESCRIPTION

[0024] The following is a detailed description of the embodiments of the present invention, such as the shapes and structures of the components involved, the relative positions and connection relationships between the components, the functions and working principles of the components, etc., with reference to the accompanying drawings.

[0025] like Figure 1As shown, the anti-backsilting and mud-removing sleeve suitable for cutting under mud of wind power steel pipe piles includes a pressure cap 2 and a sleeve body 1. The pressure cap 2 is arranged on the top of the sleeve body 1. The sleeve body 1 is a hollow cylinder. The pressure cap 2 is truncated cone-shaped as a whole. The pressure cap 2 is a hollow truncated cone. A plurality of straightening guide frames 3 are arranged on the inner wall of the pressure cap 2. The straightening guide frames 3 are arranged vertically around the inner wall of the pressure cap 2.

[0026] like Figure 2 , 3 As shown, the gland 2 and the sleeve body 1 are connected by a connecting piece 4, and at least four connecting pieces 4 are provided, and the connecting pieces 4 are evenly distributed around the periphery of the connection between the gland 2 and the sleeve body 1, and the connecting piece 4 comprises a turntable 42, a turntable column 43, a "T"-shaped plate 41, a U-shaped groove 45 and a stud 44. The turntable column 43 is provided at the center of the turntable 42, and the front end of the turntable column 43 is fixedly connected to the stud 44, and the turntable column 43 is provided on the "T"-shaped plate 41 through a base, and the U-shaped groove 45 is provided on the "T"-shaped plate 41, and a through hole is provided on the U-shaped groove 45, and the stud 44 passes through the through hole, and the bottom of the "T"-shaped plate 41 is welded to the sleeve body 1, and an external fin plate 46 is welded to the bottom of the gland 2, and a screw hole is provided at the bottom of the external fin plate 46, and the external fin plate 46 is inserted into the U-shaped groove 45, and the stud 44 is screwed into the screw hole of the external fin plate 46, and the two sides of the top of the U-shaped groove 45 are open outwards to facilitate the insertion of the external fin plate 46. The gland 2 is formed by multiple vertical steels, and arc brackets 5 are horizontally arranged on the top, bottom and middle for enclosure and reinforcement. At least four gland lifting ears 6 are evenly distributed around the top of the gland 2 for lifting the gland 2.

[0027] like Figure 1 As shown, a straightening guide frame 3 is arranged on the inner wall of the vertical steel of the gland 2. The straightening guide frame 3 is formed by four profiles. The straightening guide frame 3 and the vertical steel of the gland 2 form an irregular pentagon. The outer side of the connection between the two brackets of the straightening guide frame 3 is rounded, and the inner side is provided with a toggle plate 31. The toggle plate 31 plays a reinforcing role. The number of the straightening guide frames 3 is half of the number of the vertical steel of the gland 2, and they are arranged at intervals. Figure 4 , 5 As shown, when the deadweight of the sleeve body 1 and the gland 2 is not enough to press the device into the mud, a ballast frame is arranged on the top of the gland 2, and a ballast block is placed on the ballast frame.

[0028] like Figure 1 As shown, a plurality of reinforcing ribs 7 are vertically arranged on the outer surface of the sleeve body 1, and the reinforcing ribs 7 are evenly distributed on the outer surface of the sleeve body 1. A plurality of reinforcing ring plates 8 are horizontally arranged on the outer surface of the sleeve body 1. The reinforcing ring plate 8 at the bottom end of the sleeve body 1 is beveled inward at an angle of 45° to reduce the mud entry area and reduce the mud entry resistance of the sleeve body 1. A plurality of sleeve lifting ears 9 are arranged on the outer periphery of the top of the sleeve body 1 for lifting the sleeve body 1.

[0029] When in use, the sleeve body 1 and the pressure cover 2 are assembled on the shore, and the entire sleeve is slowly lowered underwater using a crane. The straightening guide frame 3 can form a sliding guide with the pile leg to be removed before the mud removal sleeve body 1 contacts the mud surface, thereby facilitating the sinking path of the entire sleeve to remain parallel to the axial direction of the pile leg, and the lateral displacement of the surrounding areas is limited to a specified range centered on the pile leg to be removed.

[0030] The bottom reinforcing ring plate 8 of the desilting sleeve body 1 is beveled at an angle of 45° inward to reduce the mud entry area, thereby reducing the mud entry resistance. The 16 reinforcing ribs 7 are beveled at an angle of 45° inward at the bottom to also reduce the mud entry resistance and prevent pausing during the deep descending process.

[0031] The main body of the gland 2 is welded with non-standard H-shaped steel. In the case of poor mud quality (such as relatively hard mud containing more granular sand or a large number of marine calcium carbonate shells), the total weight of the sleeve itself is not enough to support its self-weight sinking. A counterweight can be placed on the gland as needed to increase the overall weight so that the self-weight immersion depth can reach the expected immersion depth of 5m. After the self-weight immersion is completed, remove the gland 2. Place the air-lift mud removal equipment with a reamer into the annular seam between the steel pipe pile and the sleeve body 1. The annular seam spacing is about 1.5m, and the diameter of the air-lift mud removal equipment is about 1m. The 1m spacing ensures that divers can subsequently install high-pressure water cutting equipment.

[0032] After the cutting is completed, the cut steel pipe pile (including the grouting section) is lifted. Then the four sleeve lifting ears 9 on the top of the sleeve body 1 are connected, and the sleeve body 1 is lifted off the seabed to carry out the mud removal and removal work of the next steel pipe pile.

[0033] The design of the reinforcing ribs 7 and the reinforcing ring plate 8 on the sleeve body 1 can ensure the stability and strength of the sleeve under mud and optimize the structural weight. At the same time, the bevel treatment of the reinforcing ring plate and the reinforcing ribs at the bottom of the sleeve further reduces the resistance to entering mud and improves work efficiency.

[0034] The device can be quickly assembled on the ship deck. After the work is completed, it is easy to disassemble and remove underwater, and can adapt to different mud depths and mud qualities. This design enables the sleeve to cope with various complex working environments and improves its practicality in different sea areas.

[0035] The whole device is a large steel structure. To reduce the manufacturing precision requirement, the upper gland 2 and the sleeve body 1 are connected to each other only by the connector 4. Therefore, the overall machining precision requirement of the structure is not high. After the manufacturing is completed, the assembly and matching are carried out in the manufacturing plant, which can reduce the manufacturing cycle and save the manufacturing cost.

[0036] Eight straightening guide frames 3 are designed on the upper part of the gland 2. The straightening guide of the upper cover can contact the pile legs of the cut steel pipe pile before the lower sleeve contacts the mud surface, and guide the pile legs to keep the steel pipe pile in the center of the mud removal sleeve during the lowering process. In addition, combined with the ship's offshore beacon positioning, the position of the sleeve can be further accurately determined, improving construction accuracy and safety.

[0037] The diver operates to tighten the turntable 42 so that the stud 44 is screwed into the docking hole between the outer fin plate 46 and the U-shaped groove 45. This docking method greatly reduces the possibility of underwater force jamming and avoids unnecessary underwater cutting work.

[0038] The main body of the gland 2 is welded with thick non-standard H-shaped steel plates, which can provide sufficient support in sea areas with poor mud quality. If the weight of the gland 2 is not enough to support the sinking of the sleeve body 1, a counterweight can be installed on top to further increase the overall weight. This design is particularly important in the case of poor mud quality.

[0039] A small number of pressure relief holes with a diameter of about 100 mm are opened on the side wall of the sleeve body 1 to appropriately release the pressure on the external side wall, reduce the side extrusion force on the sleeve, and improve the stability of the sleeve structure.

[0040] The gland design allows the desilting sleeve to be smoothly pressed into a depth of 5m (cutting depth of 4m under mud) by superimposing a maximum pressure of 200 tons on the gland when it is under most mud (calculation shows that the shear strength is less than 100Kpa). It can be assembled on the deck and then quickly pressed in. After pressing into the specified depth, the diver removes the connector 4 and lifts the maximum ballast of about 200T together with the gland. This greatly improves the construction efficiency and eliminates the complex mud flushing system.

[0041] The method for using the anti-silting and mud-removing sleeve for cutting wind power steel pipe piles under mud comprises the following steps: (1) Before entering the water, the gland 2 and the sleeve body 1 are installed on the ship deck through the connecting parts, and a ballast frame of a predetermined tonnage is welded above the gland 2 using a counterweight; (2) The crane connects the gland lifting lug 6 with a sling to lift the entire sleeve into the water, and lowers it accurately to the steel pipe pile of the structure to be cut; (3) After the weight has entered the mud to a predetermined depth, a diver enters the water and unscrews the turntable column 43 on the connector. At this time, the sleeve body 1 is separated from the gland 2, and the upper part of the sleeve (i.e., the weight and gland) is lifted out of the water by a crane; (4) The diver cleans the mud layer between the steel pipe pile and the sleeve body 1. After the cleaning is completed, a mud removal tool with a reamer is placed into the sleeve to perform underwater mud removal; (5) After the sludge in the sleeve body 1 is removed, the steel pipe pile to be cleaned is exposed, and underwater cutting equipment is installed until the cutting is completed and the steel pipe pile is lifted off; (6) After the mud removal and cutting work is completed, the sleeve body 1 is lifted from under the mud to the water surface by a lifting device, and then the sleeve body 1 is cleaned, maintained and stored for subsequent use.

[0042] (7) During the entire construction process, various parameters are monitored and recorded in real time to ensure the accuracy and safety of the construction.

[0043] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud, characterized by: It includes a gland and a sleeve body, wherein a gland is arranged on the top of the sleeve body, the sleeve body is a hollow cylinder, the gland is in the shape of a truncated cone as a whole, the gland is a hollow truncated cone, a plurality of straightening guide frames are arranged on the inner wall of the gland, and the straightening guide frames are arranged vertically around the inner wall of the gland.

2. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 1 is characterized in that: The gland and the sleeve body are connected by a connecting piece, and at least four connecting pieces are provided, and the connecting pieces are evenly distributed around the periphery of the connection between the gland and the sleeve body. The connecting piece includes a turntable, a turntable column, a "T"-shaped plate, a U-shaped groove and a stud. The turntable column is provided at the center of the turntable, and the front end of the turntable column is fixedly connected to the stud. The turntable column is provided on the "T"-shaped plate through a base, and the U-shaped groove is provided on the "T"-shaped plate. A through hole is provided on the U-shaped groove, and the stud passes through the through hole. The bottom of the "T"-shaped plate is welded to the sleeve body, and an external fin plate is welded to the bottom of the gland. A screw hole is provided at the bottom of the external fin plate. The external fin plate is inserted into the U-shaped groove, and the stud is screwed into the screw hole of the external fin plate. Both sides of the top of the U-shaped groove are open outward to facilitate the insertion of the external fin plate.

3. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 1 is characterized in that: The gland is formed by enclosing a plurality of vertical steels, and arc brackets are horizontally arranged on the top, bottom and middle for enclosing and reinforcing, and at least four gland lifting ears are evenly distributed around the top of the gland.

4. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 3 is characterized in that: A straightening guide frame is arranged on the inner wall of the vertical steel of the gland, and the straightening guide frame is formed by four profiles. The straightening guide frame and the vertical steel of the gland form an irregular pentagon. The outer sides of the connection between the two brackets of the straightening guide frame are rounded, and toggle plates are arranged on the inner sides, which play a reinforcing role.

5. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 4 is characterized in that: A weight frame is arranged on the top of the pressure cover, and a weight block is placed on the weight frame.

6. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 1 is characterized in that: A plurality of reinforcing ribs are vertically arranged on the outer surface of the sleeve body, and the reinforcing ribs are evenly distributed on the outer surface of the sleeve body.

7. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 6 is characterized in that: A plurality of reinforcing ring plates are arranged transversely on the outer surface of the sleeve body.

8. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 7 is characterized in that: The reinforcing ring plate at the bottom end of the sleeve body is beveled inward at an angle of 45° to reduce the mud entry area and reduce the mud entry resistance of the sleeve body.

9. The anti-silting and mud-removing sleeve suitable for cutting wind power steel pipe piles under mud according to claim 8, characterized in that: A plurality of sleeve lifting ears are arranged on the periphery of the top of the sleeve body.

10. A method for using an anti-silting and desilting sleeve suitable for cutting wind power steel pipe piles under mud, characterized in that: The following steps are involved: (1) Before entering the water, the gland and sleeve body are installed on the ship deck through the connectors, and a ballast frame of a predetermined tonnage is welded above the gland using a counterweight; (2) The crane connects the gland lifting lugs with a sling to lift the entire sleeve into the water, and lowers it accurately to the steel pipe pile of the structure to be cut; (3) After the weight has entered the mud to a predetermined depth, the diver goes into the water to unscrew the turntable column on the connector. At this time, the sleeve body is separated from the gland, and the crane then lifts the upper part of the sleeve (i.e., the weight and gland) out of the water; (4) Divers clean the mud layer between the steel pipe pile and the sleeve body. After cleaning, a mud removal tool with a reamer is placed into the sleeve to perform underwater mud removal. (5) After the sludge in the sleeve body is removed, the steel pipe pile to be cleaned is exposed, and the underwater cutting equipment is installed until the cutting is completed and the steel pipe pile is lifted off; (6) After the mud removal and cutting work is completed, the sleeve body is lifted from the mud to the water surface by the lifting equipment. After that, the sleeve body is cleaned, maintained and stored for subsequent use.

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