CN116556352A - Improved underwater packer - Google Patents

Abstract

The invention provides an improved underwater packer, which comprises an outer pile and a sleeve arranged in the outer pile, wherein the outer pile and the sleeve form an annular gap, and the improved underwater packer is arranged in the annular gap; the improved underwater packer comprises an annular sealing bag, a plurality of turning plates connected to the annular sealing bag, a pressing and holding part, a traction part and a grouting pipeline; the outer side edge of the annular sealing bag is pulled by a pulling part, the inner side edge of the annular sealing bag is pressed by a pressing part to form a bottom sealing part, and the grouting pipeline outlet is connected with the annular sealing bag inlet; the pressing and holding component and the traction component are connected to the outer wall of the sleeve or the inner wall of the outer pile, and after grouting, the annular sealing bag presses the turning plate to turn over and block the annular gap. The improved underwater packer provided by the invention not only can be used for plugging gaps with any size, but also has the advantages of simplified structure, good sealing effect and capability of effectively preventing slurry leakage.

Description

Improved underwater packer

Technical Field

The invention relates to the technical field of underwater packers, in particular to an improved underwater packer.

Background

The offshore stationary platform is generally comprised of an upper block and a lower jacket. The jacket provides support for the upper block. The fixed structure of jacket on the seabed is: the sleeve is fixedly connected with the bottom of the jacket main leg, the sleeve is fixed with a steel pile driven into the seabed, and the sleeve and the steel pile are fixed through cement slurry poured into an annular gap between the sleeve and the steel pile.

The main functions of the marine underwater packer are two: 1) Grouting after piling is finished, and sealing an 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 to prevent cement paste from flowing out; 2) For soft soil seabed surfaces, a packer itself or a matched device is required to prevent soft soil mud on the seabed from entering an annular space between the outer diameter of the steel pile and the inner diameter of the sleeve in the piling process so as to ensure that cement paste is not polluted.

Currently, subsea packers for jacket installation at sea are classified into active packers and passive packers according to the type of operation. The traditional active packer mainly adopts an inflatable packer, and the inflatable packer has the advantages that: in the processes of inserting, discharging and piling the steel piles, the inflatable packer is in an uninflated state, the inner surface of the inflatable packer is not in contact with the outer surface of the steel piles, and the inflatable packer is inflated through the air inlet pipeline only after grouting, so that the purpose of plugging cement paste is achieved through the inflatable packer. Is not limited by the weight of cement paste (the height of a grouting cement column) and the water depth; the sleeve can be allowed to move upwards (when the jacket performs offshore leveling operation) and moderately decent of the steel pile; the vertical impact load of the steel pile caused by the vertical motion of the offshore crane in the stormy waves during the pile driving process and the steel pile driving process can be borne or avoided. But has the disadvantages that: the system is complex, a power station, a high-pressure pipeline, an ROV (underwater robot) emergency interface and a matched device (such as a horizontal rubber ring) are required to prevent soft soil mud on the sea floor from entering an annular space between the outer diameter of the steel pile and the inner surface of the sleeve in the piling process so as to ensure that cement paste is not polluted. An ROV (underwater robot) is required to inflate the connection hose underwater once the pipeline is damaged; the land installation and debugging workload is large, the cost is high, the offshore operation is complex, and the cost is high; the anode is consumed by a large amount of hardware which is remained, and the existence of the high-pressure pipeline endangers the underwater operation of divers; the cost is high, often several times higher than passive packers.

The passive packer mainly comprises a mechanical packer and a Crux packer. The passive packer has the advantages that: high pressure pipelines, power systems, valve installations and underwater ROV backup systems are not required; no land commissioning and offshore operations are required; at the same time, acts as a barrier to mud entering the annular space (one of the two required functions of the isolator); the anode is consumed by residual hardware, and various pipelines and valves which harm the underwater operation of a diver are avoided; the land installation and debugging work can be completed by manufacturers, and the cost is low; the overall price is low. The defects are mainly that: the damage rate is higher than that of the active packer, and when the active packer is used for a deep water jacket, the repair cost after the packer is damaged is very high. The application is limited by the depth of water, especially mechanical packers. The main reasons for the easy breakage are: the steel pile can fall down quickly or the vertical impact generated by the vertical motion of the offshore crane in stormy waves, so that the right angle with sharp outer surface of the bottom of the steel pile can possibly cause the damage and failure of the rubber component of the packer when the steel pile is inserted into the top of the steel pile.

All underwater packers need to complete the plugging of mud in the grouting process by means of external force. The effective plugging of mud by means of different forms of external force and for gaps with different sizes is a core element of all underwater packers used for representing the functions of the underwater packer. For an active inflatable packer, the external force is as follows: the air compressor arranged at the top of the jacket is used for injecting high-pressure air into each packer through an underwater pipeline to complete grouting plugging. In the inflation process, the inflatable packer can automatically deform to realize the blocking of mud aiming at gaps with different sizes.

The passive mechanical packer is provided with the following modes by means of external force: in the process of inserting the steel piles into the sleeve, discharging the steel piles and piling, the steel piles laterally and horizontally squeeze the rubber rings fixed on the inner diameter surface of the sleeve and the bent steel bars bonded with the rubber rings through vulcanization. These elastic rubber restoring forces due to horizontal extrusion are relied upon as blocking forces for cement slurries during grouting. Since mechanical packers are typically only suitable for shallow water jacket installations, the facing gap is relatively small. In the practical application of the mechanical packer, an annular rubber ring (with the inner diameter smaller than the outer diameter of the steel pile and positioned below the gap block) fixed on the inner diameter surface of the sleeve is easy to damage the sharp right angle of the outer surface of the bottom of the steel pile in the pile inserting and piling processes to cause failure when the top of the bent steel rod is fixed or the bottom of the bent steel rod is fixed. Due to the defect of the mechanical packer in structural design, the overall breakage rate of the mechanical packer in practical application is relatively high, and the mechanical packer is only suitable for shallow water jackets and steel piles with relatively small diameters.

The mode of the passive Crux packer by external force is as follows: a rubber ring horizontally arranged and positioned below the gap block; the front part of the rubber ring is connected with a large-diameter circular ring (a flexible reinforcing material is added at the center of the circle), and the inner diameter of the circular ring is smaller than the outer diameter of the steel pile; the rear annular structure is constrained by an annular constraining structure fixed on the inner diameter surface of the sleeve. The bottom of the steel pile passes through the circular ring during pile insertion, and the rubber ring previously horizontally placed is extruded and deformed into a rubber ring placed in a vertical direction. When the steel pile passes through the circular ring, the expansion of the inner diameter of the steel pile enables the circular ring to be closely attached to the outer diameter surface of the steel pile, so that the annular ring plays a role in blocking mud from entering the annular space. Meanwhile, the elastic restoring force generated by the rubber ring extruded into the vertical state forms the plugging force on cement paste in the grouting process. When the packer is used for installing a deepwater jacket, the outer diameter surface of the steel pile is usually provided with equidistant shear keys, and steel bars are welded on the outer diameter surface of the steel pile to enhance the shearing resistance of cement in the vertical direction. The circular ring of the Crux packer must allow the passage of steel piles to which shear keys are attached. The Crux packer has the following defects in structural design: the horizontally arranged rubber ring is easily scratched or damaged by the sharp right angle of the outer surface of the bottom of the steel pile in the pile inserting process. The marine jacket installation statistics indicate that: the overall failure rate of the Crux packer is higher than that of the inflatable packer.

In summary, various packers must rely on external forces of different forms to complete the plugging function of cement slurry in the grouting process. The conventional inflatable packer or the passive packer widely applied to the market at present have the defects of different forms. Therefore, it is necessary to invent a new passive packer which has to rely on different external forces to achieve the plugging of cement paste during grouting and to make the damage rate during use lower than the conventional inflatable packer.

U.S. patent No. 9,677,241, inventor James Lee, chinese name: li Jun, in 2014, 8 months, first proposes a novel passive packer, and the external force supported by the packer is the gravity of cement slurry. The design principle of the invention is as follows: the pressure difference between the pressure generated by the gravity of cement paste (specific gravity: 1.92g/cm 3) in the cavity and the pressure generated by the gravity of seawater outside the cavity of the annular rubber bag (specific gravity: 1.05g/cm 3) is used as a depending external force to realize the blocking of the cement paste in the grouting process. Since the cement slurry is liquid during grouting, the pressure difference can generate pressure in the vertical direction and the same pressure in the horizontal direction as the pressure in the vertical direction. The force in the vertical direction is transmitted to the connecting piece arranged 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 is generated by positive pressure between the inner side surface of the annular rubber bag and the outer surface of the steel pile, so that the blocking force on cement paste in the grouting process is formed. With the increase of the pressure difference (the increase of the height of the cement column), the sealing effect of the inner surface of the annular rubber bag on the outer surface of the steel pile is improved. The plugging function in the grouting process is similar to that of the traditional inflatable packer, but the external force is different. For example, if the steel pile has a diameter of 2.13 m and the cement column has a height under water of 12 m, the total plugging pressure of the inner surface acting in the cavity of the annular rubber bag (height 0.4 m) to the cement slurry on the outer surface of the steel pile is greater than 20 tons.

The annular rubber bags mentioned by the novel passive packer all have the following basic characteristics: the annular rubber bag is coaxial with the outer steel sleeve; the bottoms of the plurality of rubber belts added with fiber reinforced materials are connected with the top of the annular rubber bag; the top of each rubber belt is connected with a corresponding fixing piece arranged on the inner diameter surface of the sleeve; the gaps between the rubber belts provide channels for cement slurry to enter the annular rubber bag cavity; the middle part of the annular rubber bag is provided with an annular rubber sleeve which is added with fiber reinforced materials and has an inner diameter slightly smaller than the diameter of the steel pile; the connecting section of the rubber sleeve and the rubber belt is a cone-shaped rubber layer; the bottom of the annular rubber bag is connected with a sealing structure which is fixed on the inner diameter surface of the sleeve near the bottom, and a sealed cement paste accommodating cavity is formed between the inner diameter of the sleeve and the outer diameter of the steel pile.

In 5 months 2017, the inventor James Lee, chinese name, in the following patents of the above new passive packer us patent, us patent No. 9,970,171: li Jun, two-point improvement method is proposed: 1) A horizontal annular bottom supporting plate or a cone-shaped bottom supporting plate fixed on the inner diameter surface of the sleeve is additionally arranged below the sealing structure at the bottom of the annular rubber bag. The function of the horizontal annular bottom plate is to reduce the radial width of the gap and to utilize the annular bottom plate to support part of the vertical direction gravity to reduce the load that the vertical direction gravity bears on the annular rubber bag side rubber layer and the connecting member on the inner diameter surface of the sleeve. The cone-shaped bottom support plate can play a similar function as the horizontal annular bottom support plate, and can also cooperate with the annular rubber bag bottom structure to generate a blocking function on the gap. The gap blocking function creates a brand new method for blocking cement paste in the grouting process, and can improve the reliability of the system in the aspect of cement paste blocking; because of the existence of the horizontal annular bottom supporting plate or the cone-shaped bottom supporting plate, the loads of the side rubber layer and the bottom rubber layer of the annular rubber bag can be greatly reduced, and the thickness of the side rubber layer and the thickness of the bottom rubber layer of the annular rubber bag can be correspondingly and greatly reduced. However, the thin rubber layer with reduced thickness is subject to the phenomena of bulge and large deformation after the top of the gap is loaded by cement paste, so that local stress concentration is generated, and the thin rubber layer is easy to break. The proposed improvement is to add a thickened rubber ring to the surface of the thin rubber layer at the top of the gap, and this locally reinforced design reduces the bulge and deformation in the gap section, thereby reducing the possibility of breakage. With the two improved inventions, the overall weight of the annular rubber bag can be greatly reduced. The overall weight of the annular rubber bag is reduced, so that the manufacturing cost can be reduced, and the annular rubber bag is convenient to transport and install on site. In addition, the rubber ring which is locally thickened at the top of the gap can be combined with the cone-shaped bottom support plate to generate a blocking function on the gap, so that the reliability of the system for blocking cement paste is further improved (a packer with independent double-insurance blocking is formed).

The annular rubber bags mentioned for the new passive packer or the modified passive packer are required to be responsible for 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 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, and the cost is that the inner side surface of the annular rubber bag must be in contact with the outer surface of the steel pile, particularly in contact with the sharp right angle of the outer surface of the bottom of the steel pile during pile insertion, pile driving and pile driving; 2) The conventional rubber layer and the fixed connection on the inner surface of the sleeve must bear the main gravity of cement paste; 3) At the top of the gap, not only must structural support function across the gap under pressure be assumed, but also the grout sealing function of different gap sizes.

Jacket installations have been in the past and experienced for over 60 years. The size of the gap between the bottom sleeve of the deepwater jacket and the steel pile is standardized. Most steel piles for deep water jackets have diameters of around 2 meters and are within the diameter of the corresponding sleeve. The radial width of the gap block is 50mm in the traditional design, and the maximum allowable eccentricity of the steel pile is 50mm. If a 40mm wide horizontal annular bottom plate is used (the radial width of the annular bottom plate must be smaller than the width of the gap block), the designed gap that must be blocked at the bottom of the packer annular rubber bag is 60mm (maximum gap = 50mm +50mm-40 mm). Gaps of this size are adequate with the improved passive packers described above.

The installation of offshore wind turbines is a recently developed emerging industry. Offshore wind turbines are generally composed of an upper and a lower part: the upper part is a blade and a motor part; the lower part is a supporting structure, and the lower supporting structure is usually a structure of a single steel pile or a plurality of steel piles with large diameter. When a plurality of steel piles are adopted, the piling operation of each steel pile is usually finished, then the steel piles are used as sleeves for inserting the vertical sections at the bottoms of the main legs of the fan support during offshore operation (the bottoms of the sleeves are driven into the sea floor, the tops of the sleeves are higher than the water level), meanwhile, the underwater packer is arranged at the lower part of the vertical sections at the bottoms of the main legs, and the grouting pipeline system is arranged on the surface of the inner diameter of the bottoms of the main legs. Because piling of the steel piles is completed independently, the accuracy control of the distance between the steel piles is limited, and the generated distance error can be large, so that the requirement on the gap treatment capacity of the packer is correspondingly large. The offshore wind turbine is usually installed in shallow water, and the wind waves are very small during offshore installation operation.

The underwater packer for installing the fan can meet the requirement of 120-300 mm on the clearance. The above-described passive packers based on annular rubber bag bottom structures (incorporating fiber reinforced materials to enhance the structural strength of the rubber layer) are difficult to adequately address in the face of such large gaps. The main challenge faced by subsea packers for offshore installation of fans is the above-mentioned ultra-large gap.

Disclosure of Invention

The invention aims to disclose an improved underwater packer which not only can seal gaps with any size, but also simplifies the structure, has good sealing effect and can effectively prevent slurry leakage.

In order to achieve the above object, the present invention provides an improved underwater packer comprising an outer pile and a sleeve disposed in the outer pile, wherein the outer pile and the sleeve form an annular gap, and the improved underwater packer is mounted on the upper surface of an annular support plate in the annular gap; the improved underwater packer comprises an annular sealing bag, a plurality of turning plates connected to the annular sealing bag, a pressing and holding part, a traction part and a grouting pipeline; the outer side edge of the annular sealing bag is pulled by a pulling member, the inner side edge of the annular sealing bag is pressed by a pressing member, and the grouting pipeline outlet is connected with the annular sealing bag inlet; the pressing and holding component and the traction component are connected to the outer wall of the sleeve or the inner wall of the outer pile, and after grouting, the annular sealing bag presses the turning plate to turn over and block the annular gap.

In some embodiments, the pressing component comprises an annular supporting plate, an annular lower plate connected to the annular supporting plate, a first stud connected to the annular lower plate, an annular upper plate sleeved on the first stud and pressed with 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 supporting plate is connected to the outer wall of the sleeve or the inner wall of the outer pile.

In some embodiments, the inner side edge of the annular sealing bag is provided with an annular strip, and the annular strip is closely attached to the outer wall of the sleeve or the inner wall of the outer pile.

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

In some embodiments, the annular upper plate and annular lower plate are in a press fit with a concave-convex engagement.

In some embodiments, the pulling member comprises a plurality of second steel rings, a plurality of elastic tensioning cords, and a plurality of third steel rings; the second steel ring is connected to the outer wall of the sleeve or the inner wall of the outer pile, the top end of the elastic tensioning rope is connected to the second steel ring, the third steel ring is arranged on the annular sealing bag, and the bottom end of the elastic tensioning rope is connected to the third steel ring.

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

In some embodiments, the bottom end of the sleeve is provided with a plug, the upper end of the plug is provided with an annular rubber cleaning plate for removing the seabed sludge stuck on the inner surface of the sleeve, and the annular rubber cleaning plate is attached to the inner wall of the outer pile.

In some embodiments, the flap bottom end abuts the annular support plate upper surface.

In some embodiments, a plurality of reinforcing plates are connected to the outer surface of the turning plate.

Compared with the prior art, the invention has the beneficial effects that: the improved underwater packer provided by the invention not only can be used for plugging gaps with any size, but also has the advantages of simplified structure, good sealing effect and capability of effectively preventing slurry leakage.

Drawings

FIG. 1 is a schematic illustration of an unglued configuration of an improved underwater packer of the present invention;

FIG. 2 is a schematic diagram of an improved underwater packer of the present invention after grouting;

FIG. 3 is a schematic illustration of an alternative embodiment of an improved subsea packer of the present invention in an unglued state;

FIG. 4 is a schematic illustration of another embodiment of an improved subsea packer of the present invention after grouting;

FIG. 5 is a schematic view of the structure of the pressing member of the present invention;

fig. 6 is a schematic view of the construction of the pulling member of the present invention;

FIG. 7 is a schematic view of the configuration of the annular seal bag of the present invention;

fig. 8 is a schematic structural view of the flap according to the present invention.

Detailed Description

The present invention will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present invention, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present invention by those skilled in the art.

An improved underwater packer as shown in figures 1-8 comprises an outer pile 1 and a sleeve 2 placed inside the outer pile 1, said outer pile 1 and sleeve 2 forming an annular gap 8. The bottom end of the outer pile 1 is inserted into a seabed line b, and the top ends of the outer pile 1 and the sleeve 2 exceed the seabed line a.

The improved subsea 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 external pile 1 from any position, i.e. the central line of the external pile 1 and the central line of the sleeve 2 can be overlapped or not overlapped.

The improved underwater packer comprises an annular sealing bag 3, a plurality of turning plates 6 connected to the annular sealing bag 3, a pressing and holding part 5, a traction part 4 and grouting pipelines 7.

The holding part 5 and the traction part 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 a fan, as shown in fig. 1 and 2, the pressing part 5 and the pulling part 4 are connected to the outer wall of the sleeve 2, when the improved underwater packer is used for offshore installation of a jacket, as shown in fig. 3 and 4, the pressing part 5 and the pulling part 4 are connected to the inner wall of the outer pile 1, and the two installation modes have the same working principle, so that the detailed description is given for the installation mode that the pressing part 5 and the pulling part 4 are connected to the outer wall of the sleeve 2 in the embodiment.

The bottom end of the sleeve 2 is provided with a conical plug 21, the plug 21 is provided with an annular rubber cleaning plate 22, and the annular rubber cleaning plate 22 is attached to the inner wall of the outer pile 1 and used for cleaning the inner wall of the outer pile 1 in advance.

As shown in fig. 7, the annular sealing bag 3 is formed by folding a strip-shaped bag sheet 30, the annular sealing bag 3 is similar to an annular bag, and two ends of the strip-shaped bag sheet 30 are connected through a zipper and sealed by sealant, so that slurry leakage is prevented. The upper edge of the strip-shaped bag sheet 30, namely the outer side edge 31 of the annular sealing bag 3, is provided with a plurality of third steel rings 33, and the lower edge of the strip-shaped bag sheet 30, namely the inner side edge 32 of the annular sealing bag 3, is provided with an annular strip 34.

As shown in fig. 7 and 8, the turnplates 6 are uniformly distributed on the annular sealing bag 3 at intervals, and the turnplates 6 are connected with a plurality of reinforcing plates 62, so that the bearing capacity of the turnplates 6 is greatly improved, supporting force can be provided for the annular sealing bag 3, and slurry leakage caused by falling of the annular sealing bag 3 is prevented. The turning plate 6 is a curved surface turning plate. The device further comprises a second bolt 61 and a second nut 610 which is screwed on the second bolt 61, wherein the second bolt 61 sequentially penetrates through the annular sealing bag 3 and the turning plate 6 and is matched with the second nut 610 to realize connection of the annular sealing bag 3 and the turning plate 6, so that the turning plate 6 and the annular sealing bag 3 can synchronously move. In addition, a sealing gasket is further arranged on the second bolt 61 to play a role in sealing and prevent slurry leakage.

The outer side edge 31 of the annular sealing bag 3 is pulled by the pulling component 4, and the inner side edge 32 of the annular sealing bag 3 is pressed by the pressing component 5, so that the annular sealing bag 3 is supported, the annular sealing bag 3 is kept in a normal shape, the annular sealing bag is prevented from being soft, and grouting is facilitated.

As shown in fig. 5, the holding member 5 includes an annular support plate 51, an annular lower plate 52 welded on the annular support plate 51, a plurality of first studs 53 uniformly connected to the annular lower plate 52 at intervals, an annular upper plate 55 sleeved on the first studs 53 and pressed with 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 stud 53 and is pressed by the annular upper plate 55 and the annular lower plate 52 together, and the annular supporting plate 51 is connected to the outer wall of the sleeve 2. The press fit surfaces of the annular upper plate 55 and the annular lower plate 52 are in concave-convex fit and are in staggered contact, so that accurate positioning is facilitated.

The inner side edge 32 of the annular sealing bag 3 is provided with an annular strip 34, the annular strip 34 is tightly attached to the outer wall of the sleeve 2, so that a sealing effect is achieved, and slurry leakage in a gap between the annular sealing bag 3 and the outer wall of the sleeve 2 is prevented.

The sealing device also comprises a first steel ring 56 which is sleeved on the first stud 53 and presses the annular sealing bag 3, wherein the first steel ring 56 is pressed by the annular upper plate 55 and the annular lower plate 52 to play a role in sealing, so that slurry leakage between the annular sealing bag 3 and the outer wall of the first stud 53 is prevented.

As shown in fig. 6, 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, the outer wall of the sleeve 2 is uniformly surrounded by the second steel rings 42 at intervals, the top ends of the elastic tensioning ropes 41 are connected to the second steel rings 42, the third steel rings 33 are mounted on the annular sealing bags 3, and the bottom ends of the elastic tensioning ropes 41 are connected to the third steel rings 33. The elastic tightening rope 41 has a certain elasticity, so that the state of the annular sealing bag 3 can be conveniently adapted. The elastic tightening rope 41 is preferably a nylon rope.

The grouting pipeline 7 is arranged on the inner wall of the sleeve 2, and the outlet of the grouting pipeline 7 is connected with the inlet of the annular sealing bag 3, so that grouting into the annular sealing bag 3 is facilitated. After grouting, the annular sealing bag 3 presses the turning plate 6 to turn over and block the annular gap 8, specifically, the bottom end of the turning plate assembly is abutted to the junction point of the annular supporting plate 51 and the annular lower plate 52, under the pressing of the annular sealing bag 3, the turning plate 6 rotates towards the inner wall of the outer pile 1 by taking the bottom end of the turning plate 6 as a fulcrum, finally, the top end of the turning plate 6 abuts against the inner wall of the outer pile 1 to block the annular gap 8, and the annular sealing bag 3 is partially attached to the inner wall of the outer pile 1.

The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. An improved underwater packer is characterized by comprising an outer pile and a sleeve arranged in the outer pile, wherein the outer pile and the sleeve form an annular gap, and the improved underwater packer is arranged on the upper surface of an annular supporting plate in the annular gap;

the improved underwater packer comprises an annular sealing bag, a plurality of turning plates connected to the annular sealing bag, a pressing and holding part, a traction part and a grouting pipeline; the outer side edge of the annular sealing bag is pulled by a pulling member, the inner side edge of the annular sealing bag is pressed by a pressing member, and the grouting pipeline outlet is connected with the annular sealing bag inlet; the pressing and holding component and the traction component are connected to the outer wall of the sleeve or the inner wall of the outer pile, and after grouting, the annular sealing bag presses the turning plate to turn over and block the annular gap.

2. The improved underwater packer of claim 1, wherein the holding member comprises 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 with the annular lower plate, and a first nut screwed on the first stud and holding 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 supporting plate is connected to the outer wall of the sleeve or the inner wall of the outer pile.

3. The improved underwater packer of claim 2, wherein the inner side of the annular sealing bag is provided with an annular strip, and the annular strip is tightly attached to the outer wall of the sleeve or the inner wall of the outer pile.

4. The improved subsea packer of claim 3, further comprising a first steel ring sleeved on the first stud and holding the annular seal bag, the first steel ring being held together by the annular upper plate and the annular lower plate.

5. The improved subsea packer of claim 4, where the annular upper plate and annular lower plate are in a land relief fit.

6. The improved underwater packer of claim 1, wherein the pulling member comprises a plurality of second steel rings, a plurality of elastic tensioning lines, and a plurality of third steel rings; the second steel ring is connected to the outer wall of the sleeve or the inner wall of the outer pile, the top end of the elastic tensioning rope is connected to the second steel ring, the third steel ring is arranged on the annular sealing bag, and the bottom end of the elastic tensioning rope is connected to the third steel ring.

7. The improved underwater packer of claim 1, wherein the annular sealing bag is formed by folding a strip-shaped bag sheet, and two ends of the strip-shaped bag sheet are connected through a zipper.

8. The improved underwater packer of claim 1, wherein a plug is provided at the bottom end of the sleeve, an annular rubber cleaning plate is provided at the upper end of the plug for removing seabed sludge stuck on the inner surface of the sleeve, and the annular rubber cleaning plate is attached to the inner wall of the outer pile.

9. The improved underwater packer of claim 2, wherein the bottom end of the flap abuts the upper surface of the annular support plate.

10. The improved underwater packer of claim 9, wherein a plurality of reinforcing plates are attached to the outer surface of the flap.