A pile driving underwater grouting connecting structure

Abstract

This invention relates to the field of offshore wind power piling technology and discloses an underwater grouting connection structure for piling. The structure includes a grouting pipe, one end of which is fixedly connected to a support base. A main sleeve is fixedly connected to one side of the support base. The sealing mechanism includes an outer ring body, one end of which is fixedly connected to the main sleeve. An inner ring pipe is fixedly connected to the inner wall of the outer ring body. A transmission rod is fixedly connected to one side of the outer ring body, and the end of the transmission rod away from the outer ring body is fixedly connected to the inner wall of the inner ring pipe. The protective component includes an arc-shaped pad, which is fixedly connected to the inner wall of the inner ring pipe. A connecting pipe is fixedly connected to the right side of the arc-shaped pad, and a protective pad is fixedly connected to one end of the connecting pipe. By setting up the sealing mechanism, wear-resistant teeth push outward along the sliding groove on the inner wall of the inner ring pipe, with the tooth tips embedding and pressing against the inner wall of the steel pipe pile. This significantly increases the static friction between the sealing structure and the pile wall, preventing the upward counter-pressure of the grout during the grouting process from pushing the sealing structure and causing slippage.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power piling technology, specifically to an underwater grouting connection structure for piling. Background Technology

[0002] Underwater grouting connection structures are a core structural form used in marine engineering (offshore wind power, offshore oil platforms, etc.) to connect jacket foundations and steel pipe piles. High-strength grout is injected into the annular gap between the steel pipe piles and the jacket legs (or sleeves). After the grout solidifies, a rigid whole is formed, achieving a reliable connection and load transfer between the upper and lower structures.

[0003] Patent application CN202021103343.8 discloses an underwater grouting connection structure for offshore wind power piling, including a steel pipe pile and a guide frame. The support leg of the guide frame is inserted into the top cavity inside the steel pipe pile, and an annular grouting cavity is formed between the support leg and the steel pipe pile. The inner wall of the steel pipe pile is sealed to the outer wall of the support leg by a sealing ring. The outer periphery of the support leg is provided with guide ribs along the radial direction. The support leg is connected to the grouting guide pipe, and the end of the grouting guide pipe is divided into upper and lower grouting pipes.

[0004] However, this patent also has the following shortcomings: when the guide frame is lowered into the steel pipe pile, it only relies on the fixed guide rib for limitation and has no adaptive buffer correction structure. It is affected by ocean current disturbance and verticality deviation of pile foundation construction. During grouting operation, the grouting material generates continuous upward counter pressure, which can easily push the sealing ring to slide upward, causing the bottom seal to fail. At the same time, the external ocean current directly washes the grouting outlet, and the high-speed water flow will disperse the newly injected initial set grouting material, causing the surface grout to separate into layers. In view of this situation, an underwater grouting connection structure for pile driving is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater grouting connection structure for piling, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an underwater grouting connection structure for piling, including a grouting pipe, one end of which is fixedly connected to a support base, and one side of which is fixedly connected to a main sleeve, and a sealing mechanism is provided at the end of the main sleeve away from the support base;

[0007] The sealing mechanism includes:

[0008] An outer ring body is fixedly connected to one end of the main sleeve. An inner ring tube is fixedly connected to the inner wall of the outer ring body. A transmission rod is fixedly connected to one side of the outer ring body. The end of the transmission rod away from the outer ring body is fixedly connected to the inner wall of the inner ring tube. A protective component is provided on the inner wall of the inner ring tube.

[0009] The protective components include:

[0010] An arc-shaped pad is fixedly connected to the inner wall of the inner ring tube. A connecting pipe is fixedly connected to the right side of the arc-shaped pad, and a protective pad is fixedly connected to one end of the connecting pipe. Airflow passes through the transmission groove inside the connecting pipe and fills the cavity of the protective pad, causing the protective pad, which has elastic expansion and contraction characteristics, to expand outward.

[0011] According to the above technical solution, the protective component further includes a mounting column. One end of the mounting column is fixedly connected to the right side of the arc-shaped pad. A wear-resistant tooth is fixedly connected to the end of the mounting column away from the arc-shaped pad. The wear-resistant tooth contacts the inner wall of the inner ring tube. A connecting cylinder is fixedly connected to the inner wall of the arc-shaped pad. A transmission rod is fixedly connected to the top of the connecting cylinder. The end of the transmission rod away from the connecting cylinder is fixedly connected to the inner wall of the inner ring tube. A positioning mechanism is provided at one end of the inner ring tube. A limiting mechanism is provided at one end of the main sleeve. A driving cylinder is fixedly connected to the top of the support base. A guide tube is fixedly connected to the inner wall of the driving cylinder. The end of the guide tube away from the driving cylinder is fixedly connected to the inner wall of the main sleeve. When the protective pad expands, it drives the mounting column to move outward synchronously. The wear-resistant tooth is pushed outward along the sliding groove on the inner wall of the inner ring tube.

[0012] According to the above technical solution, the protective pad has a cavity inside, the protective pad has an elastic expansion and contraction function, the bottom of the wear-resistant tooth has a sliding groove, the inside of the connecting pipe has a transmission groove, and the inside of the arc-shaped pad has a guide groove. The airflow passes through the transmission groove inside the connecting pipe and fills the cavity of the protective pad, causing the protective pad with elastic expansion and contraction characteristics to expand outward.

[0013] According to the above technical solution, the positioning mechanism includes a ring base, which is fixedly connected to one end of the inner ring tube. A telescopic cylinder is fixedly connected to the inner wall of the ring base, and an adjusting rod is fixedly connected to the inner wall of the telescopic cylinder. A limit ring is fixedly connected to the surface of the adjusting rod, and a snap-fit ​​assembly is provided on the surface of the ring base. The ring base is fixedly installed at the bottom end of the inner ring tube and moves down synchronously with the inner ring tube.

[0014] According to the above technical solution, the snap-fit ​​assembly includes a mounting base, which is fixedly connected to the surface of the ring base. A buffer plate is fixedly connected to one end of the mounting base, and a side baffle is fixedly connected to the end of the buffer plate away from the mounting base. A connecting rod is fixedly connected to the inner wall of the side baffle, and a buffer disc is fixedly connected to the end of the connecting rod away from the inner wall of the side baffle. The connecting rod transmits the force of the side baffle to the buffer disc, and the elastic deformation of the buffer disc absorbs the downward impact.

[0015] According to the above technical solution, the limiting mechanism includes a drive box, which is fixedly connected to one end of the inner ring tube. A protective cover is rotatably connected to the inner wall of the drive box via a rotating shaft. A feed pipe is fixedly connected to the top of the protective cover. The end of the feed pipe away from the protective cover is fixedly connected to the inner wall of the main sleeve. A transmission device is fixedly connected to one side of the protective cover. A flow divider is fixedly connected to the inner wall of the protective cover. A flow guide assembly is provided at the bottom of the protective cover. The transmission device drives the protective cover to rotate around the rotating shaft inside the drive box and unfold to a preset angle, forming a semi-closed protective cavity outside the grout outlet.

[0016] According to the above technical solution, the flow guiding component includes a pad base, which is fixedly connected to the bottom of the protective cover. An arc-shaped plate is fixedly connected to the bottom of the pad base, and a compression wheel is fixedly connected to the inner wall of the arc-shaped plate. A telescopic strip is fixedly connected to the bottom of the compression wheel, and the end of the telescopic strip away from the compression wheel is fixedly connected to one side of the pad base. The pad base is fixed to the bottom of the protective cover, and when the slurry flows downward, it pushes the arc-shaped plate to open outward.

[0017] According to the above technical solution, the compression wheel has an elastic buffering function, the telescopic strip has a compression and reset characteristic, and the inner wall of the diversion plate is provided with a discharge groove. The compression wheel undergoes elastic deformation under pressure, which, together with the compression and reset elasticity of the telescopic strip, forms a flexible buffer for the outflowing slurry.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention, by setting up a positioning mechanism, transmits the force of the side baffle to the buffer plate through the connecting rod. The elastic deformation of the buffer plate absorbs the impact of lowering, automatically corrects the lateral offset of the main casing, ensures the coaxiality of the main casing and the steel pipe pile, and makes the circumferential width of the annular gap between them uniform. This fundamentally solves the problems of difficult lowering and alignment, as well as installation eccentricity and uneven gap. By setting up this mechanism, structural collision damage is avoided, the operational difficulty of lowering the jacket is greatly reduced, and the time for offshore alignment operations is shortened.

[0020] 2. This invention, through the setting of a sealing mechanism, has wear-resistant teeth that push outward along the sliding groove on the inner wall of the inner ring pipe, with the tooth tips embedding into and pressing against the inner wall of the steel pipe pile. This significantly increases the static friction between the sealing structure and the pile wall, preventing the upward counter-pressure of the grout during grouting from pushing the sealing structure and causing slippage. The outer ring body and the inner ring pipe are fixedly connected by a transmission rod, forming a double-layer rigid support frame to resist the lateral impact of external ocean currents, ensuring the structural stability of the sealing end, and fundamentally solving the defects of poor bottom sealing, grout leakage, and insufficient grouting section height.

[0021] 3. This invention, by setting a limiting mechanism, fixes the pad base to the bottom of the protective cover. When the grout flows downward, it pushes the arc plate to open outward. The compression wheel is compressed and generates elastic deformation. Combined with the compression and reset elasticity of the telescopic strip, it forms a flexible buffer for the flowing grout, reduces the impact force of the falling grout, avoids disturbing the initial set grout that has been injected at the bottom, and at the same time limits the diffusion velocity of the grout, ensuring that the grout rises and fills smoothly and uniformly along the annular gap, significantly improving the quality of grouting and pile formation under complex underwater sea conditions.

[0022] 4. By setting up a flow guiding component, the present invention continuously maintains an expanded and sealed state through the protective pad, blocking seawater from seeping into the interface between the grout and the steel pipe, preventing seawater erosion from causing interface cracks and grout spalling. The rigid support layer formed by the arc-shaped pad, the mounting column and the wear-resistant teeth can uniformly transmit interface stress, buffer the volume expansion force caused by steel corrosion, avoid the expansion of corrosion products to crack the grout, break the vicious cycle of corrosion and cracking, and significantly improve the long-term durability of the structure in the high-salt marine environment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a partial schematic diagram of the main sleeve of the present invention;

[0025] Figure 3 This is a perspective view of the sealing mechanism of the present invention;

[0026] Figure 4 This is a cross-sectional view of the protective component of the present invention;

[0027] Figure 5 This is a cross-sectional structural schematic diagram of the positioning mechanism of the present invention;

[0028] Figure 6 This is a perspective view of the snap-fit ​​assembly of the present invention;

[0029] Figure 7 This is a perspective view of the limiting mechanism of the present invention;

[0030] Figure 8 This is a perspective view of the flow guiding component of the present invention.

[0031] In the diagram: 1. Grouting pipe; 2. Support base; 3. Drive cylinder; 4. Guide pipe; 5. Main sleeve; 6. Sealing mechanism; 601. Outer ring body; 602. Inner ring pipe; 603. Transmission rod; 604. Protective component; 6041. Arc-shaped pad; 6042. Connecting cylinder; 6043. Transfer rod; 6044. Connecting pipe; 6045. Protective pad; 6046. Mounting column; 6047. Wear-resistant teeth; 7. Positioning mechanism; 701. Ring base; 702. Telescopic cylinder; 7 03. Adjusting rod; 704. Limiting ring; 705. Snap-fit ​​assembly; 7051. Mounting base; 7052. Buffer plate; 7053. Side baffle; 7054. Connecting rod; 7055. Buffer plate; 8. Limiting mechanism; 801. Drive box; 802. Protective cover; 803. Feed pipe; 804. Transmission device; 805. Diverter plate; 806. Guide assembly; 8061. Pad base; 8062. Arc plate; 8063. Compression wheel; 8064. Telescopic strip. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Example 1: See Figures 1-4 The present invention provides a technical solution: an underwater grouting connection structure for piling, including a grouting pipe 1, a support base 2 fixedly connected to one end of the grouting pipe 1, a main sleeve 5 fixedly connected to one side of the support base 2, and a sealing mechanism 6 provided at the end of the main sleeve 5 away from the support base 2.

[0036] The sealing mechanism 6 includes an outer ring body 601, which is fixedly connected to one end of the main sleeve 5. An inner ring tube 602 is fixedly connected to the inner wall of the outer ring body 601. A transmission rod 603 is fixedly connected to one side of the outer ring body 601. The end of the transmission rod 603 away from the outer ring body 601 is fixedly connected to the inner wall of the inner ring tube 602. A protective component 604 is provided on the inner wall of the inner ring tube 602. After the structure is in place, it is connected to the external high-pressure gas circuit through the drive cylinder 3 at the top of the support base 2. The gas is introduced into the main sleeve 5 through the guide pipe 4, and then sent into the guide groove inside the arc-shaped pad 6041 by the connecting cylinder 6042 fixedly supported by the transmission rod 6043.

[0037] The protective component 604 includes an arc-shaped pad 6041, which is fixedly connected to the inner wall of the inner ring pipe 602. A connecting pipe 6044 is fixedly connected to the right side of the arc-shaped pad 6041. A protective pad 6045 is fixedly connected to one end of the connecting pipe 6044. Airflow passes through the transmission groove inside the connecting pipe 6044 and fills the cavity of the protective pad 6045, causing the protective pad 6045, which has elastic expansion and contraction characteristics, to expand outward until it is tightly pressed against the inner wall of the steel pipe pile, forming a circumferentially continuous annular sealing band, which completely blocks the communication between the bottom of the annular gap and the external seawater.

[0038] The protective assembly 604 also includes a mounting post 6046, one end of which is fixedly connected to the right side of the arc-shaped pad 6041. A wear-resistant tooth 6047 is fixedly connected to the end of the mounting post 6046 away from the arc-shaped pad 6041, and the wear-resistant tooth 6047 contacts the inner wall of the inner ring tube 602. A connecting cylinder 6042 is fixedly connected to the inner wall of the arc-shaped pad 6041, and a transmission rod 6043 is fixedly connected to the top of the connecting cylinder 6042. The end of the transmission rod 6043 away from the connecting cylinder 6042 is fixedly connected to the inner wall of the inner ring tube 602. A fixed... Positioning mechanism 7, a limiting mechanism 8 is provided at one end of the main sleeve 5, a driving cylinder 3 is fixedly connected to the top of the support seat 2, a guide pipe 4 is fixedly connected to the inner wall of the driving cylinder 3, and the end of the guide pipe 4 away from the driving cylinder 3 is fixedly connected to the inner wall of the main sleeve 5. When the protective pad 6045 expands, it drives the mounting column 6046 to move outward synchronously. The wear-resistant teeth 6047 push outward along the sliding groove of the inner wall of the inner ring pipe 602, and the tooth tip is embedded in the inner wall of the steel pipe pile, which greatly increases the static friction between the sealing structure and the pile wall, and prevents the upward counter pressure of the grout during the grouting process from pushing the sealing structure to slip.

[0039] Traditional fixed rubber sealing rings rely solely on the pre-tightening force of the assembly to adhere to the pile wall, without a mechanical interlocking structure. During grouting operations, the grout material generates continuous upward counter-pressure, which can easily push the sealing ring upward, causing the bottom seal to fail and a large amount of high-strength grout material to leak out from the bottom of the gap. Therefore, protective component 604 is required.

[0040] The protective pad 6045 has an internal cavity and is elastically expandable. The bottom of the wear-resistant tooth 6047 has a sliding groove. The connecting pipe 6044 has a transmission groove. The arc-shaped pad 6041 has a flow guide groove. The outer ring body 601 and the inner ring pipe 602 are fixedly connected by a transmission rod 603 to form a double-layer rigid support frame to resist the lateral impact of external ocean currents and ensure the structural stability of the sealing end. This fundamentally solves the defects of poor bottom sealing, grout leakage, and insufficient grouting section height.

[0041] Example 2: Based on Example 1, please refer to the following... Figures 5-6 The present invention provides a technical solution: the positioning mechanism 7 includes a ring base 701, one end of which is fixedly connected to the inner ring tube 602. A telescopic cylinder 702 is fixedly connected to the inner wall of the ring base 701, and an adjusting rod 703 is fixedly connected to the inner wall of the telescopic cylinder 702. A limiting ring 704 is fixedly connected to the surface of the adjusting rod 703. A snap-fit ​​component 705 is provided on the surface of the ring base 701. The entire connection structure is fixedly connected to the support leg of the guide frame through the main sleeve 5. As the guide frame is lowered into the inner cavity of the steel pipe pile, the positioning mechanism 7 first contacts the pile wall to complete the pre-positioning and automatic centering during the lowering process. The ring base 701 is fixedly installed at the bottom end of the inner ring tube 602 and moves down synchronously with the inner ring tube 602. The telescopic cylinders 702, which are evenly arranged in the circumference, synchronously drive the adjusting rod 703 to extend outward. The limiting ring 704 limits the maximum extension stroke of the adjusting rod 703 to prevent excessive extension and jamming. The end of the adjusting rod 703 first abuts against the inner wall of the steel pipe pile to complete the initial coaxiality correction.

[0042] The snap-fit ​​assembly 705 includes a mounting base 7051, which is fixedly connected to the surface of the ring base 701. A buffer plate 7052 is fixedly connected to one end of the mounting base 7051, and a side baffle 7053 is fixedly connected to the end of the buffer plate 7052 away from the mounting base 7051. A connecting rod 7054 is fixedly connected to the inner wall of the side baffle 7053, and a buffer disc 7055 is fixedly connected to the end of the connecting rod 7054 away from the inner wall of the side baffle 7053. Simultaneously, the snap-fit ​​assembly 705 on the outer periphery of the ring base 701 is synchronously fitted against the pile wall, and the mounting base 7051 is fixed to the surface of the ring base 701. On the surface, the buffer plate 7052 undergoes elastic deformation under pressure, pushing the side baffle 7053 to fit tightly against the inner wall of the steel pipe pile; the connecting rod 7054 transmits the force of the side baffle 7053 to the buffer plate 7055, and the elastic deformation of the buffer plate 7055 absorbs the impact of the lowering, automatically corrects the lateral offset of the main sleeve 5, ensures the coaxiality of the main sleeve 5 and the steel pipe pile, and makes the circumferential width of the annular gap between them uniform. This fundamentally solves the problems of difficult lowering and alignment, as well as eccentric installation and uneven gaps, avoids structural collision damage, greatly reduces the operational difficulty of lowering the jacket, and shortens the time for offshore alignment operations.

[0043] When the guide frame is lowered into the steel pipe pile, it relies solely on the fixed guide ribs for positioning without an adaptive buffer correction structure. Due to ocean current disturbances and deviations in the verticality of the pile foundation construction, the support legs are prone to eccentricity with the steel pipe pile. Therefore, it is necessary to install a snap-fit ​​component 705.

[0044] Example 3: Based on Example 1, please refer to the following... Figures 7-8 The present invention provides a technical solution: the limiting mechanism 8 includes a drive box 801, which is fixedly connected to one end of the inner ring pipe 602. The inner wall of the drive box 801 is rotatably connected to a protective cover 802 via a rotating shaft. The top of the protective cover 802 is fixedly connected to a feed pipe 803. The end of the feed pipe 803 away from the protective cover 802 is fixedly connected to the inner wall of the main sleeve 5. A transmission device 804 is fixedly connected to one side of the protective cover 802. A diverter plate 805 is fixedly connected to the inner wall of the protective cover 802. A flow guide component 806 is provided at the bottom of the protective cover 802. After the sealing test is qualified, the grouting operation is started. The high-strength grout is input through the grouting pipe 1, enters the inner cavity of the main sleeve 5 through the support seat 2, and is then transported to the inside of the protective cover 802 of the limiting mechanism 8 through the feed pipe 803. The drive unit 804 drives the protective cover 802 to rotate and unfold to a preset angle around the shaft inside the drive box 801, forming a semi-enclosed protective cavity outside the grout outlet to prevent external ocean currents from directly impacting the grouting area. After the grout enters the protective cover 802, it is distributed to all directions through the evenly spaced discharge channels on the diversion plate 805, ensuring that the grout is evenly distributed into all directions of the annular gap, avoiding grout segregation and local void defects caused by single-inlet feeding.

[0045] The flow guiding component 806 includes a base 8061, which is fixedly connected to the bottom of the protective cover 802. An arc-shaped plate 8062 is fixedly connected to the bottom of the base 8061. A compression wheel 8063 is fixedly connected to the inner wall of the arc-shaped plate 8062. A telescopic strip 8064 is fixedly connected to the bottom of the compression wheel 8063. One end of the telescopic strip 8064 away from the compression wheel 8063 is fixedly connected to one side of the base 8061. The base 8061 is fixed to the bottom of the protective cover 802. When the grout flows downward, it pushes the arc-shaped plate 8062 to open outward. The compression wheel 8063 is compressed and undergoes elastic deformation. Combined with the compression and reset elasticity of the telescopic strip 8064, it forms a flexible buffer for the outflowing grout, reduces the impact force of the falling grout, avoids disturbing the initial set grout that has been injected at the bottom, and limits the diffusion velocity of the grout. This ensures that the grout rises and fills the pile smoothly and uniformly along the annular gap, significantly improving the quality of grouting and pile formation under complex underwater sea conditions.

[0046] Conventional double grouting pipes discharge grout directly from a single point, causing concentrated impact on localized areas. The uneven distribution of grout within the annular gap makes it easy for air bubbles to accumulate and voids to form. Therefore, a limiting mechanism is required.

[0047] The compression wheel 8063 has an elastic buffering function, the telescopic strip 8064 has a compression and reset characteristic, and the inner wall of the diversion plate 805 has a discharge groove. After the grout is poured to the design height, the feeding stops, and the protective cover 802 remains in the unfolded state. It cooperates with the sealing mechanism 6 at the bottom to form a relatively closed protective space at the upper and lower ends of the grouting section, continuously isolating the scouring and disturbance of the external ocean current, ensuring that the grout completes its initial setting and solidification in a stable environment, and preventing the initial setting grout from being dispersed by the ocean current and the surface grout from segregating. The protective pad 6045 continuously maintains an expanded and sealed state, blocking seawater from seeping into the interface between the grout and the steel pipe, preventing seawater erosion from causing interface cracks and grout peeling. The rigid support layer formed by the arc-shaped pad 6041, the mounting column 6046 and the wear-resistant teeth 6047 can uniformly transmit interface stress, buffer the volume expansion force generated by steel corrosion, prevent corrosion products from expanding and cracking the grout, break the vicious cycle of corrosion and cracking, and significantly improve the long-term durability of the structure in the high-salt marine environment.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A piling underwater grouting connection structure, comprising a grouting pipe (1), one end of which is fixedly connected to a support base (2), and one side of which is fixedly connected to a main sleeve (5), characterized in that, The main sleeve (5) is provided with a sealing mechanism (6) at the end away from the support seat (2); The sealing mechanism (6) includes: An outer ring body (601) is fixedly connected to one end of the main sleeve (5). An inner ring tube (602) is fixedly connected to the inner wall of the outer ring body (601). A transmission rod (603) is fixedly connected to one side of the outer ring body (601). The end of the transmission rod (603) away from the outer ring body (601) is fixedly connected to the inner wall of the inner ring tube (602). A protective component (604) is provided on the inner wall of the inner ring tube (602). The protective component (604) includes: An arc-shaped pad (6041) is fixedly connected to the inner wall of the inner ring tube (602). A connecting pipe (6044) is fixedly connected to the right side of the arc-shaped pad (6041). A protective pad (6045) is fixedly connected to one end of the connecting pipe (6044). The connecting pipe (6044) is used to transmit gas into the interior of the protective pad (6045).

2. The underwater grouting connection structure for piling as described in claim 1, characterized in that: The protective assembly (604) further includes a mounting post (6046), one end of which is fixedly connected to the right side of the arc-shaped pad (6041). A wear-resistant tooth (6047) is fixedly connected to the end of the mounting post (6046) away from the arc-shaped pad (6041). The wear-resistant tooth (6047) contacts the inner wall of the inner ring tube (602). A connecting cylinder (6042) is fixedly connected to the inner wall of the arc-shaped pad (6041). A transmission rod (6043) is fixedly connected to the top of the connecting cylinder (6042). The transmission rod (6043) is located away from the connecting cylinder (6041). One end of the 042) is fixedly connected to the inner wall of the inner ring tube (602). One end of the inner ring tube (602) is provided with a positioning mechanism (7). One end of the main sleeve (5) is provided with a limiting mechanism (8). The top of the support base (2) is fixedly connected with a drive cylinder (3). The inner wall of the drive cylinder (3) is fixedly connected with a guide pipe (4). The end of the guide pipe (4) away from the drive cylinder (3) is fixedly connected to the inner wall of the main sleeve (5). The protective pad (6045) is used to extend and retract outward and drive the wear-resistant teeth (6047) to slide and rub against the inner wall of the inner ring tube (602).

3. The underwater grouting connection structure for piling according to claim 2, characterized in that: The protective pad (6045) has a cavity inside and has elastic expansion and contraction function. The bottom of the wear-resistant tooth (6047) has a sliding groove. The connecting pipe (6044) has a transmission groove inside. The arc-shaped pad (6041) has a flow guide groove inside. The connecting cylinder (6042) is used to transmit gas into the arc-shaped pad (6041).

4. The underwater grouting connection structure for piling according to claim 2, characterized in that: The positioning mechanism (7) includes a ring base (701), which is fixedly connected to one end of an inner ring tube (602). A telescopic cylinder (702) is fixedly connected to the inner wall of the ring base (701), and an adjusting rod (703) is fixedly connected to the inner wall of the telescopic cylinder (702). A limit ring (704) is fixedly connected to the surface of the adjusting rod (703), and a snap-fit ​​assembly (705) is provided on the surface of the ring base (701). The adjusting rod (703) is used for insertion and fixing with the inside of the steel pipe pile.

5. The underwater grouting connection structure for piling according to claim 4, characterized in that: The snap-fit ​​assembly (705) includes a mounting base (7051), which is fixedly connected to the surface of the ring base (701). A buffer plate (7052) is fixedly connected to one end of the mounting base (7051). A side baffle (7053) is fixedly connected to the end of the buffer plate (7052) away from the mounting base (7051). A connecting rod (7054) is fixedly connected to the inner wall of the side baffle (7053). A buffer disc (7055) is fixedly connected to the end of the connecting rod (7054) away from the inner wall of the side baffle (7053). The buffer disc (7055) is used to provide elastic buffering for the internal fixing points of the steel pipe pile.

6. The underwater grouting connection structure for piling according to claim 2, characterized in that: The limiting mechanism (8) includes a drive box (801), which is fixedly connected to one end of the inner ring tube (602). The inner wall of the drive box (801) is rotatably connected to a protective cover (802) via a rotating shaft. The top of the protective cover (802) is fixedly connected to a feed pipe (803). The end of the feed pipe (803) away from the protective cover (802) is fixedly connected to the inner wall of the main sleeve (5). A transmission device (804) is fixedly connected to one side of the protective cover (802). A flow divider (805) is fixedly connected to the inner wall of the protective cover (802). A flow guide assembly (806) is provided at the bottom of the protective cover (802). The protective cover (802) is used to limit and protect the slurry.

7. The underwater grouting connection structure for piling according to claim 6, characterized in that: The flow guiding assembly (806) includes a base (8061), which is fixedly connected to the bottom of the protective cover (802). An arc-shaped plate (8062) is fixedly connected to the bottom of the base (8061). A compression wheel (8063) is fixedly connected to the inner wall of the arc-shaped plate (8062). A telescopic strip (8064) is fixedly connected to the bottom of the compression wheel (8063). One end of the telescopic strip (8064) away from the compression wheel (8063) is fixedly connected to one side of the base (8061). The arc-shaped plate (8062) is used to protect the slurry.

8. The underwater grouting connection structure for piling according to claim 7, characterized in that: The compression wheel (8063) has an elastic buffer function, the telescopic strip (8064) has a compression and reset characteristic, and the inner wall of the diversion plate (805) is provided with a discharge groove. The diversion plate (805) is used to discharge slurry into the protective cover (802).

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