An improved underwater packer

Abstract

The present invention provides an improved underwater packer, which comprises an outer pile and a sleeve disposed inside the outer pile. An annular gap is formed between the outer pile and the sleeve, and the improved underwater packer is installed in the annular gap. The improved underwater packer includes an annular sealing bag, a plurality of flap plates connected to the annular sealing bag, a pressing member, a pulling member, and a grouting pipeline. The outer side edge of the annular sealing bag is pulled by the pulling member, and the inner side edge of the annular sealing bag is pressed by the pressing member to form a bottom sealing member. The outlet of the grouting pipeline is connected to the inlet of the annular sealing bag. The pressing member and the pulling member are connected to the outer wall of the sleeve or the inner wall of the outer pile. After grouting, the annular sealing bag presses the flap plates to turn over and block the annular gap. The improved underwater packer provided by the present invention can not only block gaps of any size, but also simplifies the structure, has a good sealing effect, and can effectively prevent grout leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of subsea packers, and particularly to an improved subsea packer. Background Art

[0002] An offshore fixed platform generally consists of an upper deck and a lower jacket. The jacket provides support for the upper deck. The fixing structure of the jacket on the seabed is as follows: sleeves are fixedly connected to the bottoms of the main legs of the jacket, and the sleeves are fixed to steel piles driven into the seabed. The fixation between the sleeve and the steel pile is achieved by cement slurry poured into the annular gap between them.

[0003] The main functions of a subsea packer used in the sea are two: 1) After pile driving, grouting is carried out, and the bottom of the sleeve completes the sealing of the annular space between the inner surface of the sleeve diameter and the outer surface of the steel pile diameter to prevent the cement slurry from flowing out; 2) For the soft soil seabed surface, a 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 pile driving, so as to ensure that the cement slurry is not contaminated.

[0004] Currently, subsea packers used for jacket installation in the sea are classified into two types according to the working type: active packers and passive packers. The traditional active packer mainly uses an inflatable packer. The advantages of the inflatable packer are as follows: During the processes of steel pile insertion, pile driving, and lower pile, the inflatable packer is in an uninflated state, and its inner surface does not contact the outer surface of the steel pile. Only after grouting, it is inflated through an air inlet pipeline to achieve the purpose of sealing the cement slurry through the inflated packer. It is not restricted by the weight of the cement slurry (the height of the grouting cement column) and water depth; it can allow the upward movement of the sleeve (when the jacket is leveled at sea) and moderate eccentricity of the steel pile; it can withstand or avoid the vibration during pile driving and the vertical impact load of the steel pile caused by the vertical movement of the offshore crane in the wind and waves during the lower pile process. However, its disadvantages are as follows: The system is complex, and it requires a power station, high-pressure pipelines, ROV (remotely operated vehicle) emergency interfaces, and supporting devices (such as installing horizontal rubber rings) 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 surface of the sleeve during pile driving, so as to ensure that the cement slurry is not contaminated. Once the pipeline is damaged, an ROV (remotely operated vehicle) is required to connect the inflatable hose underwater; the onshore installation and commissioning workload is large and the cost is high, and the offshore operation is complex and the cost is high; there are a large number of residual hardware parts consuming anodes, and the existence of high-pressure pipelines endangers the underwater operation of divers; the cost is high, and it is usually several times higher than the price of passive packers.

[0005] Passive packers mainly include mechanical packers and Crux packers. The advantages of passive packers are as follows: they do not require high-pressure pipelines, power systems, valve installations, and underwater ROV backup systems; they do not require onshore commissioning and offshore operations; they can also prevent mud from entering the annulus (one of the two required functions of the isolator); there are basically no residual hardware-consuming anodes, and there are no pipelines and valves that endanger underwater diver operations; onshore installation and commissioning work can be completed at the manufacturer with low costs; the overall price is cheap. The main disadvantages are: the breakage rate is higher than that of active packers. When used in deepwater jacket platforms, the repair cost after the packer is damaged is very high. Therefore, its application is limited by water depth, especially for mechanical packers. The main reason for easy breakage is that during the rapid fall of the steel pile or the vertical movement of the offshore crane in the wind and waves, the sharp right angle on the outer surface of the bottom of the steel pile may cause damage and failure of the rubber components of the packer when the steel pile is inserted into the top of the steel pile.

[0006] All underwater packers need to rely on external forces to complete the plugging of the mud during the grouting process. The ability to effectively plug the mud by relying on different forms of external forces and for gaps of different sizes is the core element representing the function of all underwater packers. For active inflatable packers, the external force it relies on is: an air compressor installed at the top of the jacket injects high-pressure air into each packer through an underwater pipeline to complete the plugging of the grouting. During the inflation process, the inflatable packer can automatically deform according to gaps of different sizes to achieve the plugging of the mud.

[0007] The way passive mechanical packers rely on external forces is: during the process of inserting the steel pile into the sleeve, the lower pile, and driving the pile, the steel pile exerts a lateral horizontal extrusion on the rubber ring fixed on the inner diameter surface of the sleeve and the bent steel bar bonded to the rubber ring through vulcanization. The elastic rubber restoring force formed by this horizontal extrusion is relied on as the plugging force for the cement slurry during the grouting process. Since mechanical packers are usually only applicable to the installation of shallow water jacket platforms, the gaps faced are relatively small. In the actual application of mechanical packers, the annular rubber ring fixed on the inner diameter surface of the sleeve (with an inner diameter smaller than the outer diameter of the steel pile and located below the gap block), whether the top or bottom of the bent steel bar is fixed, is easily damaged by the sharp right angle on the outer surface of the bottom of the steel pile during the pile insertion and driving processes, resulting in failure. Due to the above-mentioned deficiencies in the structural design of mechanical packers, their overall breakage rate in actual applications is relatively high, and they are usually only suitable for shallow water jacket platforms and steel piles with relatively small diameters.

[0008] The way the passive Crux packer utilizes external force is as follows: There is a rubber ring horizontally placed below the spacer block; the front part of the rubber ring is connected to a large-diameter circular ring (with flexible reinforcing material added at the center), and the inner diameter of the circular ring is smaller than the outer diameter of the steel pile; the rear annular structure is restricted by an annular restricting structure fixed on the inner diameter surface of the sleeve. During the pile insertion process, the bottom of the steel pile passes through the circular ring and squeezes the previously horizontally placed rubber ring into a vertically placed rubber ring. After the steel pile passes through the circular ring, the expansion of its inner diameter causes the circular ring to closely adhere to the outer diameter surface of the steel pile, thus preventing mud from entering the annular space. At the same time, the elastic restoring force generated by the rubber ring squeezed into a vertical state forms the plugging force for the cement slurry during the grouting process. When the packer is used for the installation of deep-water jacket, shear keys are usually installed at equal intervals on the outer diameter surface of the steel pile, welded with steel bars on the outer diameter surface of the steel pile to enhance the shear resistance of the cement in the vertical direction. The circular ring of the Crux packer must allow the steel pile with shear keys installed to pass through. The deficiency in the structural design of the Crux packer is that the horizontally placed rubber ring is easily scratched or damaged by the sharp right angle on the outer surface of the bottom of the steel pile during the pile insertion process. The statistical data of offshore jacket installation shows that the overall breakage rate of the Crux packer is higher than that of the inflatable packer.

[0009] In summary, various packers must rely on different forms of external force to complete the plugging function of the cement slurry during the grouting process. There are deficiencies in different forms in the widely used traditional inflatable packers or passive packers on the current market. Therefore, it is necessary to invent a new type of passive packer, which must rely on external force different from the above to achieve the plugging of the cement slurry during the grouting process, and the breakage rate during its use should be lower than that of the above traditional inflatable packers.

[0010] U.S. Patent No. 9,677,241, inventor James Lee, Chinese name: Li Jun, first proposed a new type of passive packer in August 2014, which relies on the external force of the gravity of the cement slurry itself. The design principle of this invention is: by injecting an annular rubber bag during the grouting process, the pressure difference between the pressure generated by the gravity of the cement slurry (specific gravity: 1.92 g / cm3) in the cavity and the pressure generated by the gravity of the seawater outside the annular rubber bag cavity (specific gravity: 1.05 g / cm3) is used as the external force to achieve the sealing of the cement slurry during the grouting process. Since the cement slurry is liquid during the grouting process, this pressure difference will generate pressure not only in the vertical direction but also in the horizontal direction, and the pressure in the horizontal direction is the same as that in the vertical direction. The force in the vertical direction is transmitted to the connecting piece installed on the inner diameter surface of the sleeve through the side rubber layer of the annular rubber bag, and the force in the horizontal direction forms the sealing force of the cement slurry during the grouting process through the normal pressure between the inner surface of the annular rubber bag and the outer surface of the steel pile. As this pressure difference increases (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 will increase accordingly. The sealing function during this grouting process is similar to the form of the traditional inflatable packer, but the external force relied on is different. For example, if the diameter of the steel pile is 2.13 meters and the underwater height of the cement column is 12 meters, the total sealing pressure of the inner surface of the cavity (height 0.4 meters) of the annular rubber bag on the outer surface of the steel pile against the cement slurry is greater than 20 tons.

[0011] The annular rubber bags mentioned in the above new type of passive packer all have the following basic characteristics: The annular rubber bag is coaxial with the outer steel sleeve; the bottoms of multiple rubber bands with fiber reinforcement materials are connected to the top of the annular rubber bag; the top of each rubber band is connected to the corresponding fixing piece installed on the inner diameter surface of the sleeve; the gaps between the rubber bands provide a channel for the cement slurry to enter the cavity of the annular rubber bag; the middle part of the annular rubber bag is an annular rubber sleeve with fiber reinforcement materials and an inner diameter slightly smaller than the diameter of the steel pile; the connection section between the rubber sleeve and the rubber band is a conical rubber layer; the bottom of the annular rubber bag is connected by a sealing structure fixed near the bottom on the inner diameter surface of the sleeve and forms a sealed cement slurry accommodating cavity between the inner diameter of the sleeve and the outer diameter of the steel pile.

[0012] In May 2017, in a subsequent patent to the above-mentioned new type of passive packer in the United States Patent, U.S. Patent No. 9,970,171, the inventor James Lee, Chinese name: Li Jun, proposed two improvement methods: 1) Add a horizontal annular bottom support plate or a conical bottom support plate fixed on the inner diameter surface of the sleeve below the bottom sealing structure of the annular rubber bag. The function of the horizontal annular bottom support plate is to reduce the radial width of the gap and use the annular bottom support plate to support part of the vertical gravity to reduce the load on the side rubber layer of the annular rubber bag and the connecting components on the inner diameter surface of the sleeve. In addition to the similar functions of the horizontal annular bottom support plate, the conical bottom support plate can also cooperate with the bottom structure of the annular rubber bag to block the gap. This gap-blocking function creates a new method for plugging cement slurry during the grouting process and can improve the reliability of the system in plugging cement slurry; due to the presence of the horizontal annular bottom support plate or the conical bottom support plate, the load on the side rubber layer and the bottom rubber layer of the annular rubber bag can be significantly reduced, and the thickness of the side rubber layer and the bottom rubber layer of the annular rubber bag can be correspondingly reduced significantly. However, the thin rubber layer with reduced thickness will bulge and deform greatly after being loaded with cement slurry at the top of the gap, resulting in local stress concentration and easily causing damage to the thin rubber layer. The proposed improvement is to add a thickened rubber ring at the surface position of the thin rubber layer at the top of the gap. This locally strengthened design can reduce the bulge and deformation in the gap section, thereby reducing the possibility of damage. With the above two improved inventions, the overall weight of the annular rubber bag can be significantly reduced. Reducing the overall weight of the annular rubber bag can not only reduce the manufacturing cost, but also facilitate transportation and on-site installation. In addition, the thickened rubber ring locally thickened at the top of the gap can also be combined with the conical bottom support plate to generate a gap-blocking function, thereby further improving the reliability of the system in plugging cement slurry (forming an independent packer with double-insurance plugging).

[0013] The annular rubber bags mentioned in the above new type of passive packer or improved passive packer need 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 soft soil and 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. For this purpose, 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 angle of the outer surface at the bottom of the steel pile; 2) The traditional rubber layer and the fixing parts on the inner surface of the sleeve must bear the main gravity of the cement slurry; 3) At the top of the gap, it must not only bear the structural support function across the gap under pressure, but also bear the cement slurry sealing function for different gap sizes.

[0014] The offshore installation of jacket platforms has a history and experience of more than 60 years. The gap between the bottom sleeve of the deep-water jacket and the steel pile has been standardized. The diameter of most steel piles used for deep-water jackets is about 2 meters, which is within the diameter of the corresponding sleeve. The radial width of the traditional design of the gap block is 50 mm, and the maximum allowable eccentricity of the steel pile is also 50 mm. If a horizontal annular bottom plate with a width of 40 mm (the radial width of the annular bottom plate must be less than the width of the gap block) is used, the design gap that must be blocked at the bottom of the above-mentioned packer annular rubber bag is 60 mm (maximum gap = 50 mm + 50 mm - 40 mm). Such a gap size can be handled by the above-mentioned improved passive packer.

[0015] The installation of offshore wind turbines is an emerging industry developed recently. Offshore wind turbines usually consist of two parts: the upper part is the blade and motor part; the lower part is the support structure, and the lower support structure usually adopts the structure of a large-diameter single steel pile or multiple steel piles. When the structure of multiple steel piles is adopted, usually the piling operations of each steel pile are completed first, and then these steel piles are inserted into the sleeves (the bottom of the sleeves is driven into the seabed and the top is above the water level) at the vertical sections at the bottoms of the multiple main legs as the support for the wind turbine during offshore operations. At the same time, the underwater packer is installed at the lower part of the vertical section at the bottom of the main leg, and the grouting pipeline system is installed on the surface of the inner diameter at the bottom of the main leg. Since the piling of the steel piles is completed independently, the precision control of the distance between them is relatively limited, and the resulting distance error may be relatively large, thus leading to a relatively high requirement for the gap handling ability of the packer. The installation of offshore wind turbines is usually carried out in shallow waters, and the wind and waves during offshore installation operations are very small.

[0016] For the underwater packer used in the installation of wind turbines, the gap requirement may reach 120 mm to 300 mm. Facing such a large gap, the above-mentioned passive packer based on the bottom structure of the annular rubber bag (adding fiber reinforcing materials to enhance the structural strength of the rubber layer) is difficult to handle. The main challenge faced by the underwater packer used in the offshore installation of wind turbines is the above-mentioned extremely large gap. Summary of the Invention

[0017] The purpose of the present invention is to disclose an improved underwater packer, which can not only block gaps of any size, but also simplifies the structure, has a good sealing effect, and can effectively prevent grout leakage.

[0018] To achieve the above object, the present invention provides an improved underwater packer, which includes an outer pile and a sleeve disposed inside the outer pile. An annular gap is formed between the outer pile and the sleeve, and the improved underwater packer is installed on the upper surface of an annular support plate in the annular gap. The improved underwater packer includes an annular sealing bag, a plurality of flap plates connected to the annular sealing bag, a pressing member, a pulling member, and a grouting pipeline. The outer side edge of the annular sealing bag is pulled by the pulling member, the inner side edge of the annular sealing bag is pressed by the pressing member, and the outlet of the grouting pipeline is connected to the inlet of the annular sealing bag. The pressing member and the pulling member are connected to the outer wall of the sleeve or the inner wall of the outer pile. After grouting, the annular sealing bag presses the flap plates to turn over and block the annular gap.

[0019] In some embodiments, the pressing member 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 jointly 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.

[0020] In some embodiments, an annular strip is provided on the inner side edge of the annular sealing bag, and the annular strip is in close fit with the outer wall of the sleeve or the inner wall of the outer pile.

[0021] In some embodiments, a first steel ring sleeved on the first stud and pressing the annular sealing bag is further included, and the first steel ring is jointly pressed by the annular upper plate and the annular lower plate.

[0022] In some embodiments, the pressing surfaces of the annular upper plate and the annular lower plate are in concave-convex fit.

[0023] In some embodiments, the pulling member includes a plurality of second steel rings, a plurality of elastic tension ropes, and a plurality of 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 ends of the elastic tension ropes are connected to the second steel rings, the third steel rings are installed on the annular sealing bag, and the bottom ends of the elastic tension ropes are connected to the third steel rings.

[0024] In some embodiments, the annular sealing bag is formed by folding a strip-shaped bag piece, and the two ends of the strip-shaped bag piece are connected by a zipper.

[0025] In some embodiments, a plug is provided at the bottom end of the sleeve, and an annular rubber cleaning plate is provided at the upper end of the plug for removing the seabed silt adhered to the inner surface of the sleeve. The annular rubber cleaning plate is in fit with the inner wall of the outer pile.

[0026] In some embodiments, the bottom end of the flap plate abuts against the upper surface of the annular support plate.

[0027] In some embodiments, a number of reinforcing plates are connected to the outer surface of the flap.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: The improved underwater packer provided by the present invention can not only block gaps of any size, but also simplifies the structure, has a good sealing effect, and can effectively prevent slurry leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. is a schematic structural diagram of an improved underwater packer in an ungrouted state according to the present invention;

[0030] Figure 2 FIG. is a schematic structural diagram of an improved underwater packer after grouting according to the present invention;

[0031] Figure 3 FIG. is a schematic structural diagram of another embodiment of an improved underwater packer in an ungrouted state according to the present invention;

[0032] Figure 4 FIG. is a schematic structural diagram of another embodiment of an improved underwater packer after grouting according to the present invention;

[0033] Figure 5 FIG. is a schematic structural diagram of a holding member according to the present invention;

[0034] Figure 6 FIG. is a schematic structural diagram of a pulling member according to the present invention;

[0035] Figure 7 FIG. is a schematic structural diagram of an annular sealing bag according to the present invention;

[0036] Figure 8 FIG. is a schematic structural diagram of a flap according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

[0038] As Figure 1-8 shown, an improved underwater packer includes an outer pile 1 and a sleeve 2 disposed within the outer pile 1. An annular gap 8 is formed between the outer pile 1 and the sleeve 2. The bottom end of the outer pile 1 is inserted into the seabed line b, and both the top ends of the outer pile 1 and the sleeve 2 exceed the sea surface line a.

[0039] The improved underwater packer is installed in the annular gap 8. The use of the improved underwater packer is not limited by the size of the annular gap 8, and 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 overlap.

[0040] The improved underwater packer comprises an annular sealing bag 3 , a plurality of flaps 6 connected to the annular sealing bag 3 , a pressing component 5 , a pulling component 4 , and a grouting pipeline 7 .

[0041] 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 improved 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 improved subsea packer is used for offshore installation of a jacket, 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.

[0042] 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 .

[0043] like Figure 7 As shown, the annular sealed bag 3 is formed by folding a strip bag sheet 30, and the annular sealed bag 3 is similar to an annular pocket bag. The two ends of the strip bag sheet 30 are connected by a zipper and sealed with a sealant to prevent leakage. A plurality of third steel rings 33 are provided on the upper side of the strip bag sheet 30, i.e., the outer side 31 of the annular sealed bag 3, and an annular strip 34 is provided on the lower side of the strip bag sheet 30, i.e., the inner side 32 of the annular sealed bag 3.

[0044] like Figure 7 and 8 As shown, the flap 6 is evenly spaced and arranged on the annular sealing bag 3. A plurality of reinforcing plates 62 are connected to the flap 6, which greatly improves the bearing capacity of the flap 6 and can provide support for the annular sealing bag 3 to prevent the annular sealing bag 3 from falling and causing leakage. The flap 6 is a curved flap. It also includes a second bolt 61 and a second nut 610 screwed on the second bolt 61. The second bolt 61 passes through the annular sealing bag 3 and the flap 6 in sequence and cooperates with the second nut 610 to achieve the connection between the two, so that the flap 6 and the annular sealing bag 3 can move synchronously. In addition, a sealing gasket is also provided on the second bolt 61 to play a sealing role and prevent leakage.

[0045] The outer side 31 of the annular sealing bag 3 is pulled by a pulling member 4, and the inner side 32 of the annular sealing bag 3 is pressed by a pressing member 5, so as to support the annular sealing bag 3, keep the annular sealing bag 3 in a normal shape, prevent it from sagging, and facilitate grouting.

[0046] As Figure 5 shown, the pressing member 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 connected to the annular lower plate 52 at uniform intervals, an annular upper plate 55 sleeved on the first studs 53 and pressed against the annular lower plate 52, and a first nut 54 screwed on the first studs 53 and pressing the annular upper plate 55. The annular sealing bag 3 is sleeved on the first studs 53 and is jointly pressed by the annular upper plate 55 and the annular lower plate 52, and the annular support plate 51 is connected to the outer wall of the sleeve 2. The pressing surfaces of the annular upper plate 55 and the annular lower plate 52 are in concave-convex fit and in misaligned contact, which is convenient for accurate positioning.

[0047] An annular strip 34 is provided on the inner side 32 of the annular sealing bag 3, and the annular strip 34 is closely attached to the outer wall of the sleeve 2, playing a sealing role to prevent slurry leakage from the gap between the annular sealing bag 3 and the outer wall of the sleeve 2.

[0048] It further includes a first steel ring 56 sleeved on the first studs 53 and pressing the annular sealing bag 3. The first steel ring 56 is pressed by the annular upper plate 55 and the annular lower plate 52, playing a sealing role to prevent slurry leakage from the gap between the annular sealing bag 3 and the outer wall of the first studs 53.

[0049] As Figure 6 shown, the pulling member 4 includes a plurality of second steel rings 42, a plurality of elastic tension 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 distributed around the outer wall of the sleeve 2 at intervals. The top ends of the elastic tension ropes 41 are connected to the second steel rings 42, the third steel rings 33 are installed on the annular sealing bag 3, and the bottom ends of the elastic tension ropes 41 are connected to the third steel rings 33. The elastic tension ropes 41 have a certain elasticity, which is convenient for adapting to the state of the annular sealing bag 3. The elastic tension ropes 41 are preferably nylon ropes.

[0050] The grouting pipeline 7 is installed on the inner wall of the sleeve 2, and the outlet of the grouting pipeline 7 is connected to the inlet of the annular sealing bag 3, so as to facilitate grouting into the annular sealing bag 3. After grouting, the annular sealing bag 3 presses the flap 6 to turn over and block the annular gap 8. Specifically, the bottom end of the flap assembly abuts against the intersection point of the annular support plate 51 and the annular lower plate 52. Under the pressing of the annular sealing bag 3, the flap 6 rotates towards the inner wall of the outer pile 1 with the bottom end of the flap 6 as the fulcrum. Finally, the top end of the flap 6 abuts against the inner wall of the outer pile 1 to achieve the blocking of the annular gap 8, and a part of the annular sealing bag 3 is attached to the inner wall of the outer pile 1.

[0051] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation manners of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation manners or modifications made without departing from the technical spirit of the present invention shall be included within the protection scope of the present invention.

[0052] In addition, it should be understood that although this specification is described according to implementation manners, not every implementation manner only includes an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

Claims

1. An improved underwater packer, characterized in that, it includes an outer pile and a sleeve placed inside the outer pile. An annular gap is formed between the outer pile and the sleeve. The improved underwater packer is installed on the upper surface of an annular support plate in the annular gap; the improved underwater packer includes an annular seal bag, several flap plates connected to the annular seal bag, a pressing member, a pulling member, and a grouting pipeline; the outer side edge of the annular seal bag is pulled by the pulling member, the inner side edge of the annular seal bag is pressed by the pressing member, and the outlet of the grouting pipeline is connected to the inlet of the annular seal bag; the pressing member and the pulling member are connected to the outer wall of the sleeve or the inner wall of the outer pile. After grouting, the annular seal bag presses the flap plates to turn over and block the annular gap; the pressing member 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 seal bag is sleeved on the first stud and is jointly pressed by the annular upper plate and the annular lower plate. The annular support plate is connected to the outer wall of the sleeve or the inner wall of the outer pile; an annular strip is provided on the inner side edge of the annular seal bag, and the annular strip is closely attached to the outer wall of the sleeve or the inner wall of the outer pile; it further includes a first steel ring sleeved on the first stud and pressing the annular seal bag, and the first steel ring is jointly pressed by the annular upper plate and the annular lower plate; the pressing surfaces of the annular upper plate and the annular lower plate are in concave-convex fit.

2. The improved underwater packer according to claim 1, characterized in that, the pulling member includes several second steel rings, several elastic tension 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 ends of the elastic tension ropes are connected to the second steel rings, the third steel rings are installed on the annular seal bag, and the bottom ends of the elastic tension ropes are connected to the third steel rings.

3. The improved underwater packer according to claim 1, characterized in that, the annular seal bag is formed by folding a strip-shaped bag piece, and the two ends of the strip-shaped bag piece are connected by a zipper.

4. The improved underwater packer according to claim 1, characterized in that, a plug is provided at the bottom end of the sleeve, and an annular rubber cleaning plate is provided at the upper end of the plug for removing the seabed silt adhered to the inner surface of the sleeve, and the annular rubber cleaning plate is attached to the inner wall of the outer pile.

5. The improved underwater packer according to claim 1, characterized in that, the bottom end of the flap plate abuts against the upper surface of the annular support plate.

6. The improved underwater packer according to claim 5, characterized in that, several reinforcing plates are connected to the outer surface of the flap plate.

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