A lotus-shaped underwater packer

Abstract

The present invention provides a lotus-shaped underwater packer, comprising an annular sealing bag, a plurality of flap assemblies connected to the outside of the annular sealing bag by annular cloths, a holding component, a pulling component, and a grouting pipeline; the flap assembly includes a flap and a wing plate connected to one side of the flap, the wing plate being in contact with the other side of an adjacent flap; after grouting, the annular sealing bag presses the flap assembly to flip and seal the annular gap, and the wing plate seals the gap between adjacent flaps. The lotus-shaped underwater packer provided by the present invention can block gaps of any size. In addition, the wing plate can block the gap between adjacent flaps, not only preventing the annular sealing bag from falling through the gap between adjacent flaps, but also improving the support capacity of the annular sealing bag, achieving a good sealing effect and preventing grout leakage. Moreover, during grouting, the annular sealing bag presses one flap assembly to flip, and the other flap assemblies will automatically open in sequence, just like a lotus, without having to wait until the annular sealing bags are pressed one by one, and the force is evenly distributed, allowing for pre-support preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater packers, in particular to a lotus-shaped underwater packer. Background Art

[0002] Offshore fixed platforms typically consist of a topside module and a lower jacket. The jacket supports the topside module. The jacket is secured to the seabed using a sleeve fixed to the bottom of the jacket's main legs. The sleeve is secured using steel piles driven into the seabed. Cement slurry is poured between the sleeve and the steel piles to secure them.

[0003] The main functions of underwater packers used offshore are twofold: 1) to seal the annular space between the inner diameter surface of the sleeve and the outer diameter surface of the steel pile at the bottom of the sleeve during grouting after piling is completed, preventing the outflow of cement slurry; 2) for soft seabed surfaces, the packer itself or a supporting device is required to prevent the soft soil mud on the seabed from entering the annular space between the outer diameter of the steel pile and the inner diameter of the sleeve during the piling process to ensure that the cement slurry is not contaminated.

[0004] Currently, underwater packers used for offshore jacket installation are categorized by their operating type: active and passive. Traditional active packers primarily utilize inflatable packers. The advantages of inflatable packers are that during the insertion, installation, and driving of the steel pile, the packer remains uninflated, with its inner surface not in contact with the outer surface of the steel pile. Inflatable packers are only inflated through the air inlet line before grouting to seal the cement slurry. They are not restricted by the weight of the cement slurry (the height of the grouting cement column) or water depth; they can accommodate upward movement of the sleeve (during offshore jacket leveling operations) and moderate eccentricity of the steel pile; and they can withstand or avoid vibration during driving and vertical impact loads on the steel pile caused by the vertical movement of the offshore crane in wind and waves during the installation process. However, its disadvantages include: a complex system requiring a power station, high-pressure pipelines, an ROV (underwater vehicle) emergency interface, and supporting devices (such as horizontal rubber rings) to prevent soft seabed mud from entering the annular space between the outer diameter of the steel pile and the inner surface of the sleeve during piling, thereby protecting the cement slurry from contamination. If the pipeline is damaged, an ROV must be used to connect the hose underwater. Installation and commissioning on land is labor-intensive and costly, while offshore operations are complex and expensive. A large amount of residual hardware consumes anodes, and the presence of high-pressure pipelines jeopardizes divers' underwater operations. The cost is high, often several times higher than that of passive packers.

[0005] Passive packers primarily include mechanical and Crux packers. The advantages of passive packers include: they require no high-pressure pipelines, power systems, valve installation, or underwater ROV backup systems; they require no onshore commissioning or offshore operations; they simultaneously prevent mud from entering the annular space (one of the two required functions of an isolator); they have virtually no residual hardware to consume anodes, eliminating the various pipelines and valves that could compromise divers' underwater operations; onshore installation and commissioning can be completed at the manufacturer's expense, resulting in a low overall price. However, their main disadvantages include a higher breakage rate than active packers, and the high cost of repairing a damaged packer when used on deepwater jackets. Therefore, their application is limited by water depth, particularly for mechanical packers. The primary cause of breakage is vertical impact caused by the rapid descent of the steel pile or the vertical movement of the offshore crane in wind and waves. This can damage the sharp right-angled outer surface of the pile bottom, potentially leading to damage and failure of the packer's rubber components.

[0006] All subsea packers require external force to seal the mud during the grouting process. The ability to effectively seal the mud using various forces and across gaps of varying sizes is a core element of all subsea packers' functionality. For active pneumatic packers, this external force comes from an air compressor mounted atop the jacket, which injects high-pressure air into each packer through underwater pipelines to seal the grout. During inflation, the packer automatically deforms to seal the mud across gaps of varying sizes.

[0007] Passive mechanical packers utilize external forces by applying lateral force during the insertion, installation, and driving of the pile into the sleeve. The pile exerts horizontal force on a rubber ring fixed to the sleeve's inner diameter and a curved steel bar bonded to the rubber ring by vulcanization. This horizontal force creates a rubber restoring force that acts as a seal against the cement slurry during grouting. Since mechanical packers are typically only used in shallow-water jacket installations, they typically operate in relatively small gaps. In practical applications, the annular rubber ring fixed to the sleeve's inner diameter (with an inner diameter smaller than the pile's outer diameter and located below the gap block) and the curved steel bar at the top or bottom of the fixed sleeve are susceptible to damage from the sharp right-angled outer surface of the pile during insertion and driving, leading to failure. Due to these structural design shortcomings, mechanical packers have a high overall breakage rate in practice, making them generally suitable only for shallow-water jacket installations and smaller-diameter piles.

[0008] The passive Crux packer utilizes external force through a rubber ring positioned horizontally below the gap block. The front of the rubber ring is connected to a large-diameter circular ring (with flexible reinforcement material added at the center) with an inner diameter smaller than the outer diameter of the steel pile. The rear ring is constrained by an annular restraining structure fixed to the inner diameter of the sleeve. During pile insertion, the bottom of the steel pile passes through the circular ring, squeezing and deforming the previously horizontal rubber ring into a vertically positioned one. Once the steel pile passes through the circular ring, the expansion of its inner diameter forces the ring to adhere tightly to the outer diameter of the pile, thereby preventing mud from entering the annular space. Simultaneously, the elastic restoring force generated by the rubber ring, squeezed into a vertical position, provides a seal against the cement slurry during grouting. When the packer is used in deepwater jacket installation, evenly spaced shear keys are typically installed on the outer diameter of the steel pile. These keys are welded to the outer diameter of the pile using steel bars to enhance the vertical shear resistance of the cement. The Crux packer's circular ring must allow passage of the steel pile where the shear keys are installed. A structural flaw in the Crux packer is that the horizontally mounted rubber ring is easily scratched or damaged by the sharp, right-angled outer surface of the steel pile during pile insertion. Statistics from offshore jacket installations show that Crux packers have a higher overall damage rate than inflatable packers.

[0009] In summary, various types of packers must rely on different forms of external forces to achieve their function of sealing the cement slurry during the grouting process. The traditional inflatable packers and passive packers currently in widespread use all have various deficiencies. Therefore, it is necessary to develop a new passive packer that relies on a different external force to seal the cement slurry during the grouting process and has a lower breakage rate during use than the traditional inflatable packers.

[0010] In August 2014, inventor James Lee, also known as Li Jun, first proposed a new passive packer in U.S. Patent No. 9,677,241. This device relies on the external force of the cement slurry's own gravity. The design principle of this device is to utilize the pressure differential between the gravity of the cement slurry (specific gravity: 1.92 g / cm³) within the cavity of an annular rubber bag during grouting and the gravity of the seawater (specific gravity: 1.05 g / cm³) outside the annular rubber bag as an external force to seal the cement slurry during grouting. Because the cement slurry is liquid during grouting, this pressure differential generates not only vertical pressure but also horizontal pressure of equal magnitude. The vertical force is transmitted through the rubber layer on the side of the annular rubber bag to the connector mounted on the inner diameter surface of the sleeve. The horizontal force, generated by the positive pressure between the inner surface of the annular rubber bag and the outer surface of the steel pile, creates a sealing force against the cement slurry during grouting. As this pressure differential increases (as the height of the cement column increases), the sealing effect of the inner surface of the annular rubber bag on the outer surface of the steel pile increases. This sealing function during the grouting process is similar to that of traditional inflatable packers, but relies on different external forces. For example, if the steel pile diameter is 2.13 meters and the underwater height of the cement column is 12 meters, the total sealing pressure of the cement slurry on the outer surface of the steel pile from the inner surface of the annular rubber bag cavity (0.4 meters high) will exceed 20 tons.

[0011] The annular rubber bags mentioned in the above-mentioned new passive seals all have the following basic characteristics: the annular rubber bag is coaxial with the outer steel sleeve; the bottoms of multiple rubber belts with fiber reinforcement materials are connected to the top of the annular rubber bag; the top of each rubber belt is connected to a corresponding fixing piece installed on the inner diameter surface of the sleeve; the gap between the rubber belts provides a channel for cement slurry to enter the annular rubber bag cavity; the middle part of the annular rubber bag is an annular rubber sleeve with fiber reinforcement material and an inner diameter slightly smaller than the diameter of the steel pile; the connecting section between the rubber sleeve and the rubber belt is a conical rubber layer; the bottom of the annular rubber bag is connected to the inner diameter surface of the sleeve with the help of a sealing structure fixed to the inner diameter surface of the sleeve near the bottom, and a sealed cement slurry containing cavity is formed between the inner diameter of the sleeve and the outer diameter of the steel pile.

[0012] In May 2017, in a follow-up patent application to the aforementioned new passive packer, U.S. Patent No. 9,970,171, inventor James Lee, also known by his Chinese name Li Jun, proposed two improvements: 1) Adding a horizontal annular support plate or a conical support plate fixed to the inner diameter surface of the sleeve below the sealing structure at the bottom of the annular rubber bag. The horizontal annular support plate reduces the radial width of the gap and partially supports vertical gravity, thereby reducing the load exerted by vertical gravity on the rubber layer on the side of the annular rubber bag and the connecting components on the inner diameter surface of the sleeve. In addition to performing similar functions to the horizontal annular support plate, the conical support plate also cooperates with the bottom structure of the annular rubber bag to block the gap. This gap-blocking function creates a novel method for sealing cement slurry during grouting, improving the system's reliability in terms of cement slurry blocking. Due to the presence of a horizontal annular or conical base plate, the load on the side and bottom rubber layers of the annular rubber bag can be significantly reduced, and the thickness of the side and bottom rubber layers can be correspondingly reduced. However, when subjected to the cement slurry load at the top of the gap, the thin rubber layer with reduced thickness will bulge and deform significantly, causing localized stress concentration and potentially damaging the thin rubber layer. The proposed improvement involves adding a thickened rubber ring to the surface of the thin rubber layer at the top of the gap. This localized reinforcement reduces bulging and deformation in the gap section, thereby reducing the likelihood of damage. With these two improvements, the overall weight of the annular rubber bag can be significantly reduced. Reducing the overall weight of the annular rubber bag not only reduces manufacturing costs but also facilitates transportation and on-site installation. In addition, the locally thickened rubber ring at the top of the gap can also be combined with the conical bottom support plate to produce a plugging function for the gap, thereby further improving the reliability of the system in sealing the cement slurry (forming an independent double-safety plugging packer).

[0013] The annular rubber bag mentioned in the above-mentioned new passive packer or improved passive packer needs to perform three basic functions: 1) The inner diameter of the annular rubber bag must be smaller than the diameter of the steel pile to prevent the soft soil mud on the seabed from entering the annular space between the outer diameter of the steel pile and the inner diameter of the sleeve during the piling process. The price paid for this is that the inner surface of the annular rubber bag must contact the outer surface of the steel pile during the insertion, driving and piling of the steel pile, especially the sharp right-angled contact with the outer surface of the bottom of the steel pile; 2) The traditional rubber layer and the fasteners on the inner surface of the sleeve must bear the main gravity of the cement slurry; 3) The top of the gap must not only bear the structural support function across the gap under pressure, but also bear the cement slurry sealing function of a certain gap size.

[0014] Jacket installation offshore has a history and experience spanning over 60 years. The size of the gap between the bottom sleeve and the steel pile of a deepwater jacket has been standardized. Most steel piles used for deepwater jackets have a diameter of approximately 2 meters, which falls within the diameter of the corresponding sleeve. The radial width of the traditionally designed gap block is 50 mm, and the maximum allowable eccentricity of the steel pile is also 50 mm. If a 40 mm wide horizontal annular bottom support plate is used (the radial width of the annular bottom support plate must be less than the width of the gap block), the design gap that must be sealed at the bottom of the annular rubber bag of the aforementioned packer is 60 mm (maximum gap = 50 mm + 50 mm - 40 mm). This size of gap can be handled using the aforementioned improved passive packer.

[0015] The installation of offshore wind turbines is a recently emerging industry. Offshore wind turbines typically consist of two parts: the upper part houses the blades and motor; the lower part is the support structure, which typically utilizes either a single large-diameter steel pile or multiple piles. When using multiple piles, each pile is typically driven individually. These piles then serve as sleeves inserted into the vertical sections of the turbine's multiple main legs during offshore installation (the bottom of the sleeve is driven into the seabed, and the top is elevated above sea level). Subsea packers are installed at the bottom of the vertical sections of the main legs, and the grouting system is installed on the inner diameter surface of the main legs. Because the piles are driven independently, the precision of the distance between them is limited, resulting in significant distance errors, which in turn places greater demands on the packer's clearance capacity. Offshore wind turbine installation is typically performed in shallow waters, where wind and waves are relatively low.

[0016] Subsea packers used in wind turbine installations may require clearances ranging from 120mm to 300mm. Passive packers based on an annular rubber bag bottom structure (with fiber reinforcement to enhance the rubber layer's structural strength) are unable to meet these large clearances. This extremely large clearance is a major challenge for subsea packers used in offshore wind turbine installations. Summary of the Invention

[0017] The purpose of the present invention is to disclose a lotus-shaped underwater sealer that can seal gaps of any size. In addition, the wing plates can seal gaps between adjacent flaps, which not only prevents the annular sealing bag from falling from the gaps between adjacent flaps, but also improves the supporting capacity of the annular sealing bag, has a good sealing effect, and avoids leakage. During grouting, the annular sealing bag presses one of the flap assemblies to flip over, and the other flap assemblies will actively open in turn, just like a lotus. There is no need to wait until the annular sealing bags are pressed one by one, and the force is evenly distributed, so support preparations can be made in advance.

[0018] To achieve the above-mentioned purpose, the present invention provides a lotus-shaped underwater packer, comprising an outer pile and a sleeve arranged in the outer pile, the outer pile and the sleeve forming an annular gap, and the lotus-shaped underwater packer is installed on the upper surface of a horizontal annular support plate at the bottom of the sleeve in the annular gap; the lotus-shaped underwater packer comprises an annular sealing bag, a flap assembly connected to the outside of the annular sealing bag by a plurality of ring cloths, a pressing component, a pulling component, and a grouting pipeline; the outer edge of the annular sealing bag is pulled by the pulling component, the inner side bottom of the annular sealing bag is pressed by the pressing component, and the grouting pipeline outlet and the annular sealing bag inlet are connected; the pressing component and the pulling component are connected to the outer wall of the sleeve or the inner wall of the outer pile; the flap assembly comprises a flap and a wing plate connected to one side of the flap, the wing plate fits the other side of the adjacent flap; after grouting, the annular sealing bag presses the flap assembly to flip and seal the annular gap, and the wing plate seals the gap between adjacent flaps.

[0019] In some embodiments, the wing panel is connected to the inner side of the flap, and the wing panel is in contact with the inner side of the adjacent flap.

[0020] In some embodiments, the flap and the wing plate are both curved, a rubber rod is provided at the top end of the flap, and an elastic sealing strip is provided at the top end of the wing plate.

[0021] In some embodiments, a wire ring is further included. A plurality of steel hole seats are provided at the bottom of the flap, and the wire ring passes through the steel hole seat on each flap in sequence.

[0022] In some embodiments, the holding component includes an annular support plate, an annular lower plate connected to the annular support plate, a first stud connected to the annular lower plate, an annular upper plate sleeved on the first stud and pressed against the annular lower plate, and a first nut screwed on the first stud and pressing the annular upper plate; the annular sealing bag is sleeved on the first stud and is pressed by the annular upper plate and the annular lower plate, and the annular support plate is connected to the outer wall of the sleeve or the inner wall of the outer pile.

[0023] In some embodiments, a vertical annular strip is provided on the inner side of the annular sealing bag, and the vertical annular strip is in close contact with the outer wall of the sleeve or the inner wall of the outer pile.

[0024] In some embodiments, the invention further comprises a first steel ring which is sleeved on the first stud and presses the annular sealing bag, wherein the first steel ring is pressed by the annular upper plate and the annular lower plate.

[0025] In some embodiments, the pressing surfaces of the annular upper plate and the annular lower plate are concave-convex matched.

[0026] In some embodiments, the pulling component includes several second steel rings, several elastic pulling ropes, and several third steel rings; the second steel rings are connected to the outer wall of the sleeve or the inner wall of the outer pile, the top end of the elastic pulling rope is connected to the second steel ring, the third steel ring is installed on the annular sealing bag, and the bottom end of the elastic pulling rope is connected to the third steel ring.

[0027] In some embodiments, the annular sealed bag is formed by folding a strip-shaped bag sheet, and two ends of the strip-shaped bag sheet are connected by a waterproof zipper.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the lotus-shaped underwater seal provided by the present invention can seal gaps of any size. In addition, the wing plates can seal gaps between adjacent flaps, which not only prevents the annular sealing bag from falling from the gaps between adjacent flaps, but also improves the supporting capacity of the annular sealing bag, has a good sealing effect, and avoids leakage. During grouting, the annular sealing bag presses one of the flap assemblies to flip over, and the other flap assemblies will actively open in turn, just like a lotus. There is no need to wait until the annular sealing bags are pressed one by one, and the force is evenly distributed, so support preparations can be made in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a lotus-shaped underwater packer in the present invention in an un-grouted state;

[0030] Figure 2 This is a schematic structural diagram of a lotus-shaped underwater packer after grouting shown in the present invention;

[0031] Figure 3 This is a structural schematic diagram of another embodiment of a lotus-shaped underwater packer of the present invention in a non-grouting state;

[0032] Figure 4 This is a schematic structural diagram of another embodiment of a lotus-shaped underwater packer after grouting shown in the present invention;

[0033] Figure 5 It is a structural schematic diagram of the pressing component shown in the present invention;

[0034] Figure 6 It is a structural schematic diagram of the pulling component shown in the present invention;

[0035] Figure 7 This is a schematic structural diagram of the annular sealing bag shown in the present invention;

[0036] Figure 8 It is a structural schematic diagram of the flap assembly shown in the present invention;

[0037] Figure 9 for Figure 8 A top view of

[0038] Figure 10 It is a structural schematic diagram of the flap shown in the present invention;

[0039] Figure 11 This is a schematic diagram of the installation structure of the flap assembly shown in the present invention (closed before grouting);

[0040] Figure 12 This is a schematic diagram of the installation structure of the flap assembly shown in the present invention (opened after grouting);

[0041] Figure 13 It is a structural schematic diagram of another flap assembly shown in the present invention. DETAILED DESCRIPTION

[0042] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0043] like Figure 1-12 The lotus-shaped underwater packer shown includes an outer pile 1 and a sleeve 2 disposed within the outer pile 1, wherein the outer pile 1 and the sleeve 2 form an annular gap 8. The bottom end of the outer pile 1 is inserted into the seabed line b, and the top ends of the outer pile 1 and the sleeve 2 are both above the sea surface line a.

[0044] The lotus-shaped underwater packer is installed in the annular gap 8. The use of the lotus-shaped underwater packer is not limited by the size of the annular gap 8. The sleeve 2 can be inserted into the outer pile 1 from any position, that is, the center line of the outer pile 1 and the center line of the sleeve 2 can overlap or not.

[0045] The lotus-shaped underwater packer includes an annular sealing bag 3 , a plurality of flap assemblies connected to the outside of the annular sealing bag 3 , a pressing component 5 , a pulling component 4 , and a grouting pipeline 7 .

[0046] The pressing component 5 and the pulling component 4 are connected to the outer wall of the sleeve 2 or the inner wall of the outer pile 1. Specifically, when the lotus-shaped underwater packer is used for offshore installation of wind turbines, Figure 1 and 2 As shown, the pressing component 5 and the pulling component 4 are connected to the outer wall of the sleeve 2. When the lotus-shaped underwater packer is used for offshore installation of a jacket, as shown in FIG. Figure 3 and 4 As shown, the pressing component 5 and the pulling component 4 are connected to the inner wall of the outer pile 1. The working principles of the two installation methods are the same. To avoid redundancy, in this embodiment, the installation method in which the pressing component 5 and the pulling component 4 are connected to the outer wall of the sleeve 2 is specifically described.

[0047] A conical plug 21 is provided at the bottom end of the sleeve 2 , and an annular rubber cleaning plate 22 is provided on the plug 21 . The annular rubber cleaning plate 22 is in contact with the inner wall of the outer pile 1 and is used for pre-cleaning the inner wall of the outer pile 1 .

[0048] like Figure 7 As shown, the annular sealed bag 3 is formed by folding a strip of bag 30. The annular sealed bag 3 resembles a circular pocket bag. The two ends of the strip of bag 30 are connected by a waterproof zipper and sealed with sealant to prevent leakage. Several third steel rings 33 are provided on the upper edge of the strip of bag 30, i.e., the outer edge 31 of the annular sealed bag 3. Vertical annular strips 34 are provided on the lower edge of the strip of bag 30, i.e., the inner edge 32 of the annular sealed bag 3.

[0049] like Figure 8-12 As shown, the flap assembly is evenly spaced and arranged around the annular sealing bag 3. The flap assembly includes a flap 6 and a wing plate 63 connected to one side of the flap 6. The wing plate 63 is connected to the inner side of the flap 6. Specifically, the flap 6 and the wing plate 63 are connected by bolts and nuts.

[0050] The wing plate 63 is attached to the other side of the adjacent flap 6, specifically, the wing plate 63 is attached to the inner side of the adjacent flap 6. The flap 6 and the wing plate 63 are both curved, so as to facilitate enclosing the annular sealing bag 3.

[0051] The bottom end of the flap assembly abuts the junction of the annular support plate 51 and the annular lower plate 52. It also includes a wire ring 65. A steel hole seat 64 is provided at the bottom of the flap 6. The wire ring 65 passes through the steel hole seat 64 on each flap 6 in sequence, which serves to fix the bottom position of the flap assembly, so that the bottom end of the flap assembly always abuts the junction of the annular support plate 51 and the annular lower plate 52, allowing the flap assembly to rotate around this junction as a fulcrum. After grouting, the flap assembly is flipped over, and the steel hole seat 64 rotates around the wire ring 65.

[0052] After grouting, the annular sealing bag 3 presses the flap assembly to flip and seal the annular gap 8, and the wing plate 63 blocks the gap between the adjacent flaps 6. On the one hand, it prevents the annular sealing bag 3 from falling from the gap between the adjacent flaps 6, improves the supporting capacity of the annular sealing bag 3, has a good sealing effect, and avoids leakage. On the other hand, during grouting, the annular sealing bag 3 presses one of the flap assemblies to flip, and the other flap assemblies will open actively in turn, like a lotus. There is no need to wait until the annular sealing bags 3 are pressed one by one, and the force is evenly distributed, so support preparations can be made in advance.

[0053] The flap 6 is connected to several reinforcing plates 62, further enhancing its load-bearing capacity and providing support for the annular sealing bag 3, preventing it from falling and potentially leaking. The flap 6 also includes a second bolt 61 and a second nut 610 threaded onto the bolt 61. The second bolt 61 passes through the annular sealing bag 3 and the flap 6 in sequence, engaging the second nut 610 to connect them, allowing the flap 6 and the annular sealing bag 3 to move synchronously. Furthermore, a sealing gasket is attached to the second bolt 61 to provide a seal and prevent leakage.

[0054] The outer side 31 of the annular sealing bag 3 is pulled by the pulling component 4, and the inner side 32 of the annular sealing bag 3 is pressed by the pressing component 5, thereby supporting the annular sealing bag 3 and keeping the annular sealing bag 3 in a normal shape to prevent it from collapsing and facilitate grouting.

[0055] like Figure 5 As shown, the holding component 5 includes an annular support plate 51, an annular lower plate 52 welded to the annular support plate 51, a plurality of first studs 53 evenly spaced and connected to the annular lower plate 52, an annular upper plate 55 that is sleeved over the first studs 53 and pressed against the annular lower plate 52, and a first nut 54 screwed onto the first studs 53 and pressing the annular upper plate 55. The annular sealing bag 3 is sleeved over the first studs 53 and is held together by the annular upper plate 55 and the annular lower plate 52. The annular support plate 51 is connected to the outer wall of the sleeve 2. The pressed surfaces of the annular upper plate 55 and the annular lower plate 52 have a concave-convex fit and staggered contact, facilitating accurate positioning.

[0056] An annular strip 34 is provided on the inner side 32 of the annular sealing bag 3 , and the annular strip 34 fits tightly against the outer wall of the sleeve 2 to seal and prevent leakage of slurry from the gap between the annular sealing bag 3 and the outer wall of the sleeve 2 .

[0057] It also includes a first steel ring 56 that is sleeved on the first stud 53 and presses the annular sealing bag 3. The first steel ring 56 is pressed by the annular upper plate 55 and the annular lower plate 52 to play a sealing role and prevent slurry from leaking between the gap between the annular sealing bag 3 and the outer wall of the first stud 53.

[0058] like Figure 6 As shown, the pulling component 4 includes a plurality of second steel rings 42, a plurality of elastic pulling ropes 41, and a plurality of third steel rings 33. The second steel rings 42 are connected to the outer wall of the sleeve 2 and are evenly spaced around the outer wall of the sleeve 2. The top end of the elastic pulling rope 41 is connected to the second steel ring 42. The third steel ring 33 is installed on the annular sealing bag 3. The bottom end of the elastic pulling rope 41 is connected to the third steel ring 33. The elastic pulling rope 41 has a certain elasticity to facilitate adapting to the state of the annular sealing bag 3. In this embodiment, the elastic pulling rope is preferably a nylon rope.

[0059] The grouting line 7 is installed on the inner wall of the sleeve 2, and the outlet of the grouting line 7 is connected to the inlet of the annular sealing bag 3, thereby facilitating grouting into the annular sealing bag 3. After grouting, the annular sealing bag 3 presses the flap assembly to flip over and seal the annular gap 8. Specifically, the bottom end of the flap assembly abuts against the annular support plate 51. Under the pressure of the annular sealing bag 3, the flap assembly rotates toward the inner wall of the outer pile 1 with the bottom end of the flap assembly as a fulcrum. Finally, the top end of the flap assembly abuts against the inner wall of the outer pile 1 to seal the annular gap 8, and the annular sealing bag 3 partially adheres to the inner wall of the outer pile 1.

[0060] like Figure 13 As shown, in order to achieve better sealing performance, a rubber rod 66 can be further provided at the top of the flap 6, and an elastic sealing strip 631 is provided at the top of the wing plate 63. When the flap assembly is opened, the rubber rod 66 and the elastic sealing strip 631 form a good seal with the inner wall of the outer pile 1.

[0061] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0062] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lotus-shaped underwater packer, characterized in that: It includes an outer pile and a sleeve placed in the outer pile, wherein the outer pile and the sleeve form an annular gap, and the lotus-shaped underwater packer is installed on the upper surface of a horizontal annular support plate at the bottom of the sleeve in the annular gap; The lotus-shaped underwater packer includes an annular sealing bag, a plurality of flap assemblies connected to the outside of the annular sealing bag, a pressing component, a pulling component, and a grouting pipeline; The outer side of the annular sealing bag is pulled by a pulling component, and the inner bottom of the annular sealing bag is pressed by a holding component. The grouting pipeline outlet is connected to the annular sealing bag inlet; the holding component and the pulling component are connected to the outer wall of the sleeve or the inner wall of the outer pile; The flap assembly includes a flap and a wing plate connected to one side of the flap, and the wing plate is attached to the other side of the adjacent flap; After grouting, the annular sealing bag presses the flap assembly to flip and seal the annular gap, and the wing plate seals the gap between adjacent flaps; The wing plate is connected to the inner side of the flap, and the wing plate is attached to the inner side of the adjacent flap; The flap and wing plate are both curved, a rubber rod is provided at the top of the flap, and an elastic sealing strip is provided at the top of the wing plate; The bottom of the flap is provided with a plurality of steel hole seats, and the wire ring passes through the steel hole seat on each flap in turn; The pressing component includes an annular support plate, an annular lower plate connected to the annular support plate, a first stud connected to the annular lower plate, an annular upper plate sleeved on the first stud and pressed against the annular lower plate, and a first nut screwed on the first stud and pressing the annular upper plate; the annular sealing bag is sleeved on the first stud and pressed by the annular upper plate and the annular lower plate, and the annular support plate is connected to the outer wall of the sleeve or the inner wall of the outer pile; The inner side of the annular sealing bag is provided with a vertical annular strip, and the vertical annular strip is tightly fitted to the outer wall of the sleeve or the inner wall of the outer pile; The annular sealed bag is formed by folding a strip bag piece, and two ends of the strip bag piece are connected by a waterproof zipper.

2. The lotus-shaped underwater packer according to claim 1, characterized in that: It also includes a first steel ring which is sleeved on the first stud and presses the annular sealing bag, wherein the first steel ring is pressed by the annular upper plate and the annular lower plate.

3. The lotus-shaped underwater packer according to claim 2, characterized in that: The pressing surfaces of the annular upper plate and the annular lower plate are concave-convex matched.

4. The lotus-shaped underwater packer according to claim 1, characterized in that: The pulling component includes several second steel rings, several elastic pulling ropes, and several third steel rings; the second steel rings are connected to the outer wall of the sleeve or the inner wall of the outer pile, the top end of the elastic pulling rope is connected to the second steel ring, the third steel ring is installed on the annular sealing bag, and the bottom end of the elastic pulling rope is connected to the third steel ring.

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