Reinforcing device and reinforcing construction method for underwater structure

Abstract

The underwater structure is an underwater pile body, at least one defect exists on the pile body, the defect extends up and down by at least 20 cm, at least two limiting grooves are formed in the periphery of the pile body, clamping grooves are formed in the upper end face and the lower end face of each limiting groove, and a reinforcing system is installed on the periphery of the position of each limiting groove. According to the reinforcing device, under the double mechanisms of mechanical locking and grouting bonding, the bearing capacity and durability of the pile body are improved, the pile body is repaired and reinforced, a reinforcing construction method is further provided, and the reinforcing device has the advantages of being high in practicability and easy to popularize and apply. Corresponding construction methods are adopted for reinforcing the foundation problem and the pile body problem, the pile body is integrally reinforced, and the service life of the pile body is prolonged.

Description

Technical Field

[0001] The invention relates to a reinforcement device and a reinforcement construction method for an underwater structure. Background Art

[0002] Under the influence of water flow, impact of ships, ice, tides, seawater erosion, etc., underwater piles will suffer from concrete aging, peeling and cracking, and their bearing capacity will be greatly reduced. Therefore, underwater pile foundations are reinforced to improve the bearing capacity of old bridges and extend their service life. Underwater structure reinforcement generally uses the same building materials (wood, concrete, steel) used in the original building to complete the repair, which cannot fundamentally improve the structure's ability to resist corrosion and damage. Repeated repairs will be required in the future, which is expensive. The main method for repairing and reinforcing underwater structures is the underwater cofferdam plus expanded cross-section method. The underwater cofferdam isolates the water and uses concrete to seal the bottom. The cofferdam must be installed before construction and reinforcement is carried out in the absence of water. This method is difficult to construct, costly, time-consuming, and occupies a large amount of resources. It has an impact on the waterway and poses safety risks. Some underwater structures are restricted by the surrounding environmental conditions and cannot be repaired effectively and promptly. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a reinforcement device and reinforcement construction method for underwater structures. The reinforcement device improves the bearing capacity and durability of the pile body under the dual mechanism of mechanical locking and grouting bonding, and plays a role in repairing and reinforcing the pile body. It also provides a reinforcement construction method, and provides corresponding construction methods to reinforce the foundation problems and the pile body itself, thereby reinforcing the pile body as a whole and extending the service life of the pile body.

[0004] To achieve the above-mentioned purpose, the present invention provides a reinforcement device for an underwater structure, wherein the underwater structure is an underwater pile body, and there is at least one defect on the pile body, and the defect extends at least 20 cm above and below, and at least two limit grooves are opened on the periphery of the pile body, and the upper and lower end faces of the limit grooves are provided with clamping grooves, and a reinforcement system is installed around the limit groove position, and the reinforcement system is clamped with the clamping groove and reinforced with the limit groove through grouting.

[0005] Furthermore, the reinforcement system includes an outer protective sleeve, the inner wall of the outer protective sleeve is detachably connected to a reinforcement piece, the reinforcement piece includes a bottom sealing plate, the upper end of the bottom sealing plate is connected to a plurality of adjacent arc-shaped plates by fasteners, and the plurality of arc-shaped plates are spliced ​​to form a sleeve shape, and a reinforced seal is provided on the bottom sealing plate, and the reinforced seal is used to ensure the sealing between the bottom sealing plate and the outer wall of the pile body.

[0006] Furthermore, the outer protective sleeve is provided with a lifting lug, and the lifting lug is connected to the lowering structure.

[0007] Furthermore, the bottom sealing plate includes a first bottom plate and a second bottom plate, which are sealed together, and a positioning groove for placing the arc-shaped plate is provided on the first bottom plate and the second bottom plate, and a placement groove is provided on the inner side walls of the first bottom plate and the second bottom plate facing the positioning groove, and the placement groove and the positioning groove are connected by an arc-shaped through groove, and the parts of the first bottom plate and the second bottom plate close to the outside of the positioning groove are extended upward to provide an extension plate, and the extension plate and the bottom plate are integrally formed, a plurality of threaded holes are distributed circumferentially on the side wall of the extension plate, an elastic sealing strip is embedded in the inner side wall of the extension plate, and the reinforced seal is arranged in the positioning groove and the placement groove.

[0008] Furthermore, the reinforced seal includes an airbag arranged in the positioning groove and the placement groove, the airbag is connected to an inflation pipe, and the inflation pipe is connected to an external inflation system.

[0009] Furthermore, the arc-shaped plate has a cavity, and a slidingly connected limit block is provided in the cavity corresponding to the limit groove. The interior of the limit block is communicated with the cavity, and a telescopic clamping piece is provided on the limit block. The inner wall of the outer protective sleeve is provided with a pushing piece corresponding to the limit block. The limit block is driven by the pushing piece to move and match the limit groove to synchronously retract the clamping piece and engage with the clamping slot. The limit block and the inner wall of the arc-shaped plate that fits the pile body both have holes.

[0010] Furthermore, the pushing member includes a step plate arranged on the inner wall of the outer protective sleeve, and the step plate is vertically slidably connected to a pushing rod, and the pushing rod is connected to a rotating rod. The rotating rod is fixed to the upper position of the inner wall of the outer protective sleeve by a limiting ring, and the pushing rod is moved up and down by rotating the rotating rod. An annular groove is provided at the lower position of the inner wall of the outer protective sleeve for the elastic sealing ring on the outside of the arc plate to engage and seal.

[0011] Furthermore, the arc-shaped plate has an annular limiting groove with a notch on one side, and a limiting column is provided on the other side corresponding to the annular limiting groove. The limiting column has a vertical channel along the length direction and is connected to the groove opened at the bottom of the arc-shaped plate, and the inflation pipe is arranged in the vertical channel.

[0012] Furthermore, the limiting groove is spiral or ring-shaped.

[0013] A construction method for underwater structure reinforcement is also provided, comprising the following steps:

[0014] S1: Divers or underwater robots inspect the underwater pile to identify any problems with the underwater structure. These problems are categorized as foundational issues and pile issues. For foundational issues, cement mixing piles are driven around the soil surrounding the pile to form a composite foundation with the existing foundation.

[0015] S2: Determine the location and size of the defect on the pile body, clean the outer surface of the pile body by extending 20 cm above and below the defect, and make corresponding grooves according to the pile body to form a limit groove. The upper and lower end surfaces of the limit groove are opened with slots. The shape of the limit groove is determined according to the location and construction difficulty;

[0016] S3: Assemble the reinforcement pieces around the pile body above water, then install the outer protective sleeve around the reinforcement pieces. The reinforcement pieces and the outer protective sleeve are sealed by a sealing ring, and the upper and lower limit positions are achieved by the sealing ring. Then, the outer protective sleeve and the reinforcement pieces are moved to the defective position by lowering the structure.

[0017] S4: Inflate the airbag inside the bottom sealing plate through the reinforced sealing member on the bottom sealing plate, and seal the bottom sealing plate with the pile body and the curved plate through the airbag. Then, the water in the outer protective sleeve and the reinforcement is pumped out through the pumping equipment.

[0018] S5: The limit block is matched with the limit groove by pushing the pusher downward, and the telescopic clamp on the limit block is engaged with the clamping groove to realize the connection between the reinforcement member and the pile body, and then grouting is performed inside the reinforcement member by the grouting equipment;

[0019] S6: After grouting is completed and the forming is completed, the structure is lowered to recover the outer protective sleeve to complete the reinforcement of the underwater pile body.

[0020] Beneficial effects: This application realizes the precise installation of the reinforcement by combining the limiting grooves and card slots on the pile body with the limiting blocks and telescopic card blocks of the reinforcement, provides temporary fixation before grouting, and avoids position displacement due to water flow, buoyancy and other factors during underwater operations; then during the grouting operation, grouting is used for supplementary reinforcement. The slurry fills the surface defects of the pile body and can penetrate through the holes on the arc plate and the limiting plate to form an anchor effect, thereby enhancing the interface bonding force. Under the dual mechanism of mechanical locking and grouting bonding, the bearing capacity and durability of the pile body are improved, thereby repairing and reinforcing the pile body.

[0021] It also provides a reinforcement construction method, and makes corresponding reinforcement for both foundation problems and problems with the pile itself. For foundation problems, cement mixing is used to form a composite foundation to improve the bearing capacity of the soil around the pile. The pile support is repaired and reinforced through a reinforcement system, and the pile body is reinforced as a whole, thereby extending the service life of the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the reinforcement molding of the reinforcement device;

[0023] Figure 2 This is a top view of the reinforcement system installed on the pile;

[0024] Figure 3 It is a schematic diagram of the matching between the limiting block and the pile limiting groove;

[0025] Figure 4 This is a schematic diagram of the internal reinforcement system;

[0026] Figure 5 is a schematic diagram of a curved plate;

[0027] Figure 6 Schematic diagram of the connection between the outer protective sleeve and the curved plate.

[0028] Figure markings: 1. Limiting groove; 2. Card slot; 3. Reinforcement system; 4. Outer protective sleeve; 5. Reinforcement member; 51. Bottom sealing plate; 52. Arc plate; 53. Reinforced seal; 531. Airbag; 532. Inflation pipe; 6. Lifting ear; 7. First bottom plate; 8. Second bottom plate; 9. Positioning groove; 10. Placement groove; 11. Extension plate; 12. Limiting block; 13. Telescopic clamp; 14. Pushing member; 141. Step plate; 142. Pushing rod; 143. Rotating rod; 15. Annular limiting groove; 16. Limiting column; 161. Vertical channel. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0030] Traditional reinforcement also includes external concrete reinforcement, steel hoop reinforcement, carbon fiber cloth reinforcement, and casing reinforcement. A specific example of traditional methods and steps: water isolation is required through a cofferdam, and then construction is carried out within the cofferdam. A layer of underwater epoxy resin glue is evenly applied to the surface of the pile as a base adhesive. The fiberglass cloth is wrapped layer by layer along the circumference of the pile. When wrapping each layer, ensure that the cloth surface is flat and wrinkle-free, and the overlap width is not less than 100mm. Epoxy resin glue is applied simultaneously during the wrapping process to ensure that the fiber cloth is completely soaked and to avoid residual bubbles. After wrapping is completed, wait for the glue to cure (the underwater curing time needs to be adjusted according to the characteristics of the glue type, usually 24-48 hours), and protect the pile from water impact during the curing period.

[0031] Another method involves applying a release agent to the surface of a preformed fiberglass sleeve (to facilitate subsequent removal of the external protective structure) and applying adhesive to the inside. The sleeve is lowered to the defective location on the pile body using a lowering device. Divers or robots then assist in splicing the sleeve, securing the joint with clamps or tie wraps to ensure a tight seal. The gap between the sleeve and the pile body is then filled with adhesive.

[0032] Refer to Figure 1As shown, the present application provides a reinforcement device for an underwater structure that is different from the above-mentioned prior art. The underwater structure is an underwater pile body. There is at least one defect on the pile body. At least two limit grooves 1 extend above and below the defect. The limit groove 1 is spiral or annular in shape. The present application preferably has an annular shape. The upper and lower end surfaces of the limit groove 1 are provided with a clamping groove 2. A reinforcement system 3 is installed on the periphery of the limit groove 1. The reinforcement system 3 is clamped with the clamping groove 2 and reinforced with the limit groove 1 through grouting.

[0033] Refer to Figure 1 、 Figure 4 As shown, the reinforcement system 3 includes an outer protective sleeve 4, which includes a first arc-shaped sleeve and a second arc-shaped sleeve. The first arc-shaped sleeve and the second arc-shaped sleeve can be formed by snapping or binding to ensure that the connection is sealed. The first arc-shaped cylinder and the second arc-shaped cylinder are both provided with grooves at the lower position of the inner walls. The grooves are used for the sealing ring of the outer wall of the reinforcement 5 to engage and seal, and at the same time serve as a connection between the outer protective sleeve 4 and the reinforcement 5. The reinforcement 5 includes a bottom sealing plate 51, and the bottom sealing plate 51 includes a first bottom plate 7 and a second bottom plate 8. The first bottom plate 7 and the second bottom plate 8 are sealed and fastened together. A positioning groove 9 for placing the arc plate 52 is provided on the first bottom plate 7 and the second bottom plate 8. A placement groove 10 is provided on the inner side wall of the first bottom plate 7 and the second bottom plate 8 facing the positioning groove 9. The placement groove 10 is connected to the positioning groove 9 through an arc-shaped through groove. The part of the first bottom plate 7 and the second bottom plate 8 close to the outside of the positioning groove 9 extends upward to provide an extension plate 11, and the extension plate 11 is integrally formed with the bottom plate. A plurality of threaded holes are distributed circumferentially on the side wall of the extension plate 11, and an elastic sealing strip is embedded in the inner wall of the extension plate 11.

[0034] The upper ends of the first base plate 7 and the second base plate 8 are connected to a plurality of adjacent arc-shaped plates 52 by fasteners. The plurality of arc-shaped plates 52 are spliced ​​together to form a sleeve. The arc-shaped plates 52 have a cavity. A sliding limit block 12 is provided in the cavity corresponding to the limit groove 1. The interior of the limit block 12 is connected to the cavity. The limit block 12 is provided with a telescopic clamp 13. The telescopic clamp 13 is a spring-connected clamp. The inner wall of the outer protective sleeve 4 is provided with a pusher 14 corresponding to the limit block 12. The pusher 14 drives the limit block 12 to move and match the limit groove 1, and the telescopic clamp is engaged with the clamping groove 2. The connection between the pile body and the reinforcement 5 is strengthened and the firmness of the pile body and the reinforcement 5 is strengthened by slurry molding. In order to facilitate the connection of the slurry with the outer wall of the pile body and the cavity of the reinforcement 5, the limit block 12 and the inner wall of the arc-shaped plate 52 that is in contact with the pile body are both provided with holes. Alternatively, in order to further strengthen the tightness between the reinforcement member 5 and the pile body, a tapered channel can be provided on the inner wall of the arc plate 52 toward the pile body, and the pile body is provided with a tapered groove corresponding to the tapered channel, and grouting is injected into the tapered channel to achieve a strengthened connection.

[0035] Refer to Figure 5As shown, one side of the arc-shaped plate 52 is provided with an annular limiting groove 151 with a notch, and the other side corresponding to the annular limiting groove 151 is provided with a limiting column 16, and the limiting column 16 is provided with a vertical channel 161 along the length direction to communicate with the groove opened at the bottom of the arc-shaped plate 52, and the reinforced seal 53 includes an inflation pipe 532, and the inflation pipe 532 is arranged in the vertical channel 161, and the inflation pipe 532 is connected to the airbag 531, and the airbag 531 is arranged in the positioning groove 9 and the placement groove 10. By inflating the airbag 531, the airbag 531 will expand to fill the groove at the bottom of the arc-shaped plate 52, and the airbag 531 arranged in the placement groove 10 will stretch laterally and then close to the outer wall of the pile body to achieve sealing, thereby preventing water from entering the reinforcement 5.

[0036] Refer to Figure 4 、 Figure 6 As shown, the pushing member 14 includes a step plate 141 arranged on the inner wall of the outer protective sleeve 4, and a pushing rod 142 is vertically slidably connected to the step plate 141, and the pushing rod 142 is connected to the rotating rod 143. The rotating rod 143 is fixed to the upper position of the inner wall of the outer protective sleeve 4 by a limiting ring, and the up and down movement of the pushing rod 142 is achieved by rotating the rotating rod 143. An annular groove is provided at the lower position of the inner wall of the outer protective sleeve 4 for the elastic sealing ring on the outside of the arc plate 52 to engage and seal. The lower end of the pushing rod 142 is inclined, which fits into the inclined surface of the end of the limit block 12 to facilitate pushing the limit block 12 to move horizontally.

[0037] The technical solution of the present application adopts a combination of mechanical clamping and grouting to form double reinforcement, which is a technical solution different from the traditional glass fiber sleeve construction reinforcement principle of glass fiber cloth plus adhesive wrapping the pile body. It avoids the problem of adhesive in the traditional glass fiber sleeve causing bonding strength attenuation due to long-term immersion, and upgrades the traditional flexible bonding to mechanical fixation plus rigid filling, which can adapt to complex underwater environments and especially solves the problem of bonding reliability; avoids the traditional steel plate hoop reinforcement method that requires welding or bolt connection, and the problem of poor underwater welding quality; avoids the passive wrapping of the external concrete reinforcement method, transforms the passive into active anchoring, and improves pull-out resistance; avoids the problem of low positioning accuracy of the casing reinforcement method.

[0038] The present application also combines the dynamic sealing of the inflatable airbag with the material sealing of the sealing strip and sealing ring to form a dry working construction environment, solve the problem of traditional grouting being disturbed by water flow, and improve the grouting quality.

[0039] A construction method for underwater structure reinforcement is also provided, comprising the following steps:

[0040] S1: Divers or underwater robots inspect the underwater pile to identify any problems with the underwater structure. These problems are categorized as foundational issues and pile issues. For foundational issues, cement mixing piles are driven around the soil surrounding the pile to form a composite foundation with the existing foundation.

[0041] S2: Determine the location and size of the defect on the pile body, clean the outer surface of the pile body by extending 20 cm above and below the defect, and make corresponding grooves according to the pile body to form a limiting groove 1. The upper and lower end surfaces of the limiting groove 1 are opened with a clamping groove 2. The shape of the limiting groove 1 is determined according to the location and construction difficulty;

[0042] S3: Assemble the reinforcement members on the periphery of the above-water pile body, and then install the outer protective sleeve 4 on the periphery of the reinforcement member 5. The reinforcement member 5 and the outer protective sleeve 4 are sealed by a sealing ring and the upper and lower limit are achieved by the sealing ring. Then, the outer protective sleeve 4 and the reinforcement member 5 are moved to the defect position by the lowering structure;

[0043] S4: The airbag 531 in the bottom sealing plate 51 is inflated through the reinforced sealing member 53 on the bottom sealing plate 51, and the bottom sealing plate 51 is sealed against the pile body and the curved plate 52 by the airbag 531. Then, the water in the outer protective sleeve 4 and the reinforcement member 5 is pumped out by the pumping equipment.

[0044] S5: The limit block 12 is matched with the limit groove 1 by pushing the pusher 14 downward, and the telescopic clamp 13 on the limit block 12 is engaged with the clamping groove 2 to realize the connection between the reinforcement member 5 and the pile body, and then grouting is performed inside the reinforcement member 5 by the grouting equipment;

[0045] S6: After grouting is completed and the forming is completed, the structure is lowered to recover the outer protection sleeve 4 to complete the reinforcement of the underwater pile body.

[0046] Based on the above reinforcement device and construction method, a specific explanation is given by taking the limit groove 1 as an example of a ring. Divers or underwater robots inspect the underwater pile body to determine the problems existing in the underwater structure. The problems are divided into foundation problems and problems with the pile body itself. For foundation problems, cement mixing piles are driven around the soil around the pile to first locate the pile driving position. Different positioning methods are used according to whether the pile body is in shallow water or deep water. In shallow water areas, a total station can be used in conjunction with a buoy to locate the pile driving position. In deep water areas, after the position is located, the submersible drill rig is lowered by a crane and the drill rig is started. The drill rod is paused after reaching the designed depth and grouting and mixing are started. While lifting the drill rod, the high-pressure grouting pump is turned on for grouting. The cement mixing pile is reinforced to form a composite foundation with the original foundation, thereby increasing the stiffness of the soil and thereby ensuring the stability of the connection between the bottom of the pile body and the foundation.

[0047] As for the pile body itself, due to the effects of water flow force, ship collision, tidal seawater corrosion, etc., the concrete is aged, peeled off, cracked, etc., resulting in reduced bearing capacity. Therefore, in this application, it is also necessary to repair and reinforce the damaged parts of the pile body itself. The divers clean and groove the parts that need to be repaired and reinforced on the periphery of the pile body to form a limit groove 1, and provide a card groove 2 on the upper and lower end surfaces of the limit groove 1. When the divers are processing the pile body, the water staff simultaneously assemble the reinforcement system 3 to the pile body. After the pile body is cleaned and processed, the reinforcement system 3 is lowered to the position to be reinforced through the lowering structure (the lowering structure is an existing technology and will not be described in detail here). The bottom of the reinforcement member 5 is sealed by the reinforced sealing member 53. After sealing, the reinforcement system 3 forms a sleeve shape with an open upper end. The water in the reinforcement system 3 is pumped out by a water pump, so that a dry working environment is formed in the casting cavity formed by the splicing of multiple arc plates and the outer wall of the pile body. The dry working environment has higher grouting molding quality than the wet working environment. The rotating rod is then rotated to move the push rod downward. The lower end of the push rod is inclined, which can push the limit block to move horizontally, allowing the telescopic clip on the limit block to engage the retaining groove of the pile body. The limit block has multiple holes, and the inner plate of the curved plate is provided with holes. The lowering structure of the outer protective sleeve and the reinforcement member are locked with the pile body, ensuring that the entire reinforcement system is not affected by water and cannot shift its position underwater, ensuring that the grouting can accurately cover the position of the pile body to be reinforced. By lowering the grouting pipe into the cavity of the curved plate for grouting, the slurry will pass through the holes to connect the curved plate to the outer surface of the pile body, and can also fill the surface defects of the pile body through the holes. This solves the problem of the prior art of repairing the pile body first and then reinforcing it with a fiberglass sleeve and adhesive, thereby accelerating construction efficiency. After the grouting is completed and the slurry is formed and fixed, the lowering structure recovers the outer protective sleeve and applies it to other reinforcement members to reinforce other pile bodies.

Claims

1. A reinforcement device for an underwater structure, wherein the underwater structure is an underwater pile, and the pile has at least one defect, characterized in that: At least two limiting grooves (1) are provided on the periphery of the pile body extending at least 20 cm above and below the defect, and the upper and lower end surfaces of the limiting groove (1) are provided with clamping grooves (2). A reinforcement system (3) is installed on the periphery of the limiting groove (1), and the reinforcement system (3) is clamped with the clamping groove (2) and reinforced with the limiting groove (1) through grouting.

2. The underwater structure reinforcement device according to claim 1, characterized in that: The reinforcement system (3) comprises an outer protective sleeve (4), the inner wall of the outer protective sleeve (4) is detachably connected to a reinforcement member (5), the reinforcement member (5) comprises a bottom sealing plate (51), the upper end of the bottom sealing plate (51) is connected to a plurality of adjacent arc-shaped plates (52) by fasteners, and the plurality of arc-shaped plates (52) are spliced ​​to form a sleeve shape, and a reinforcement seal (53) is provided on the bottom sealing plate (51), and the reinforcement seal (53) is used to ensure the sealing between the bottom sealing plate (51) and the outer wall of the pile body.

3. The underwater structure reinforcement device according to claim 2, characterized in that: A lifting lug (6) is provided on the wall of the outer protective sleeve (4), and the lifting lug (6) is connected to the lowering structure.

4. The underwater structure reinforcement device according to claim 3, characterized in that: The bottom sealing plate (51) comprises a first bottom plate (7) and a second bottom plate (8), the first bottom plate (7) and the second bottom plate (8) are sealed and connected to each other, a positioning groove (9) for placing the arc plate (52) is provided on the first bottom plate (7) and the second bottom plate (8), a placement groove (10) is provided on the inner side wall of the first bottom plate (7) and the second bottom plate (8) facing the positioning groove (9), the placement groove (10) and the positioning groove (9) are connected through an arc-shaped through groove, the first bottom plate (7) and the second bottom plate (8) are provided with an extension plate (11) extending upward from the outer side of the positioning groove (9), and the extension plate (11) and the bottom plate are integrally formed, a plurality of threaded holes are distributed on the side wall of the extension plate (11), an elastic sealing strip is embedded in the inner side wall of the extension plate (11), and the reinforcing seal (53) is arranged in the positioning groove (9) and the placement groove (10).

5. The underwater structure reinforcement device according to claim 4, characterized in that: The reinforced seal (53) includes an air bag (531) disposed in the positioning groove (9) and the placement groove (10); the air bag (531) is connected to an inflation pipe (532); and the inflation pipe (532) is connected to an external inflation system.

6. The underwater structure reinforcement device according to claim 5, characterized in that: The arc-shaped plate (52) has a cavity, and a slidingly connected limit block (12) is provided in the cavity corresponding to the limit groove (1). The interior of the limit block (12) is communicated with the cavity, and a telescopic clamping piece (13) is provided on the limit block (12). The inner wall of the outer protective sleeve (4) is provided with a pusher (14) corresponding to the limit block (12). The limit block (12) is driven by the pusher (14) to move and match the limit groove (1), and the telescopic clamping piece is clamped with the clamping groove (2). The limit block (12) and the inner wall of the arc-shaped plate (52) that is in contact with the pile body are both provided with holes.

7. The underwater structure reinforcement device according to claim 6, characterized in that: The pushing member (14) includes a step plate (141) arranged on the inner wall of the outer protective sleeve (4), a pushing rod (142) is vertically slidably connected to the step plate (141), and the pushing rod (142) is connected to a rotating rod (143). The rotating rod (143) is fixed to the upper position of the inner wall of the outer protective sleeve (4) through a limiting ring, and the pushing rod (142) is moved up and down by rotating the rotating rod (143). An annular groove is provided at the lower position of the inner wall of the outer protective sleeve (4) for the elastic sealing ring outside the arc plate (52) to be engaged and sealed.

8. The underwater structure reinforcement device according to claim 7, characterized in that: One side of the arc-shaped plate (52) is provided with an annular limiting groove (15) with a notch, and the other side is provided with a limiting column (16) corresponding to the annular limiting groove (15). The limiting column (16) is provided with a vertical channel (161) along the length direction and is connected to the groove opened at the bottom of the arc-shaped plate (52). The inflation pipe (532) is arranged in the vertical channel (161).

9. The underwater structure reinforcement device according to claim 8, characterized in that: The limiting groove (1) is in a spiral or ring shape.

10. A construction method for reinforcing an underwater structure according to claim 9, characterized in that: The following steps are involved: S1: Divers or underwater robots inspect the underwater pile to identify any problems with the underwater structure. These problems are categorized into two types: foundation problems and problems with the pile itself. For foundation problems, cement mixing piles are driven around the soil surrounding the pile to form a composite foundation with the existing foundation. S1: Divers or underwater robots inspect the underwater pile to identify any problems with the underwater structure. These problems are categorized as foundational issues and pile issues. For foundational issues, cement mixing piles are driven around the soil surrounding the pile to form a composite foundation with the existing foundation. S2: Determine the position and size of the defect on the pile body, clean the outer surface of the pile body by extending 20 cm above and below the defect, and make corresponding grooves according to the pile body to form a limiting groove (1), the upper and lower end surfaces of the limiting groove (1) are opened with a clamping groove (2), and the shape of the limiting groove (1) is determined according to the position and construction difficulty; S3: assembling the reinforcement member (5) on the outer periphery of the pile body above water, and then installing the outer protective sleeve (4) on the outer periphery of the reinforcement member (5), the reinforcement member (5) and the outer protective sleeve (4) are sealed by a sealing ring and the upper and lower limit are achieved by the sealing ring, and then the outer protective sleeve (4) and the reinforcement member (5) are moved to the defect position by lowering the structure; S4: Inflate the airbag (531) in the bottom sealing plate (51) through the reinforced sealing member (53) on the bottom sealing plate (51), and seal the bottom sealing plate (51) with the pile body and the curved plate (52) through the airbag (531), and then pump out the water in the outer protective sleeve (4) and the reinforcement member (5) through the pumping equipment; S5: The limiting block (12) is matched with the limiting groove (1) by pushing the pushing member (14) downwards, and the telescopic clamping member (13) on the synchronous limiting block (12) is clamped with the clamping groove (2) to realize the connection between the reinforcement member (5) and the pile body, and then grouting is performed inside the reinforcement member (5) by grouting equipment; S6: After the grouting is completed and the forming is completed, the structure is lowered and the outer protective sleeve (4) is recovered to complete the reinforcement of the underwater pile body.

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