CN216892418U - Improved underwater packer - Google Patents

Abstract

The utility model provides an improved underwater packer, which comprises an external pile and a sleeve arranged in the external pile, wherein the external pile and the sleeve form an annular gap; the improved underwater packer comprises an annular sealing bag, a plurality of turning plates connected to the annular sealing bag, a pressing component, a traction component 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 and held by a pressing member to form a bottom sealing member, and the outlet of the grouting pipeline is connected with the inlet of the annular sealing bag; 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 utility model can be used for plugging any gap, simplifies the structure, has a good sealing effect and can effectively prevent slurry leakage.

Description

Improved underwater packer

Technical Field

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

Background

Offshore fixed platforms are typically made up of an upper block and a lower jacket. The jacket provides support to the upper block. The fixing structure of the conduit frame on the seabed is as follows: the sleeve is fixedly connected to the bottom of the main leg of the jacket, the sleeve is fixed to the 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 plugging 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 surface, a packer or a matched device is needed to prevent the 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, underwater packers used offshore for jacket installation are classified into two types, 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: during the processes of inserting, setting and piling of the steel pile, 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 pile, and the inflatable packer is inflated through an air inlet pipeline only after grouting so as to achieve the purpose of plugging cement paste through the inflated packer. The weight of the cement paste (the height of the grouting cement column) and the water depth are not limited; the possibility of allowing an upward movement of the sleeve (when the jacket is subjected to offshore levelling operations) and a moderate eccentricity of the steel pile; the vertical impact load of the steel pile caused by the vertical movement of the offshore crane in the stormy waves in the pile discharging process can be borne or avoided. But the disadvantages are: the system is complex, needs to be equipped with a power station, a high-pressure pipeline, an ROV (underwater robot) emergency interface and a matching device (such as a horizontal rubber ring) for preventing soft soil mud at the seabed from entering an annular space between the outer diameter of the steel pile and the inner surface of the sleeve during the piling process, so as to ensure that the cement paste is not polluted. The need to use an ROV (underwater robot) to inflate the connection hose underwater once the pipeline is damaged; the land installation and debugging workload is large, the cost is high, and the offshore operation is complex and the cost is high; a large amount of residual hardware consumes the anode, and the existence of a high-voltage pipeline jeopardizes underwater operation of divers; the cost is high, and is usually several times higher than the price of the passive packer.

The passive packers mainly include mechanical packers and Crux packers. The passive packer has the advantages that: high-pressure pipelines, power systems, valve installation and underwater ROV standby systems are not needed; land debugging and offshore operation are not required; simultaneously, the function of blocking mud from entering the annular space is achieved (one of two required functions of the isolator); there is essentially no residual hardware consuming anodes, and there are no various lines and valves that jeopardize the diver's underwater operation; the land installation and debugging work can be finished in a manufacturer, so the cost is low; the overall price is cheap. The defects mainly comprise: the damage rate is higher than that of an active packer, and when the active packer is used for a deepwater jacket, the cost for repairing the damaged packer is very high. The application is limited by the depth of the water, especially mechanical packers. The main reasons for the easy breakage are: the vertical impact generated by the rapid falling of the steel pile or the vertical movement of the offshore crane in the stormy waves causes the sharp right angle on the outer surface of the bottom of the steel pile to possibly cause the damage and the failure of the rubber part of the packer when the right angle is inserted into the top of the steel pile.

All underwater packers need to finish plugging the slurry in the grouting process by means of external force. The effective blocking of the mud can be realized by means of external force in different forms and aiming at gaps with different sizes, and the effective blocking is a core element which is used by all underwater packers to represent self functions. For the active inflatable packer, the external force by which it is assisted is: and high-pressure air is injected into each packer through an underwater pipeline by an air compressor arranged at the top of the conduit frame to complete the plugging of grouting. In the inflating process, the inflatable packer can automatically deform to realize the plugging of slurry aiming at gaps with different sizes.

The passive mechanical packer adopts an external force mode as follows: during the process of inserting and piling the steel pile into the sleeve and the pile, the steel pile horizontally extrudes the rubber ring fixed on the inner diameter surface of the sleeve and the bent steel bar bonded with the rubber ring through vulcanization. These elastic rubber restoring forces due to horizontal squeezing are relied upon as plugging forces against the grout during grouting. Since mechanical packers are generally only suitable for shallow water jacket installations, the facing clearances are relatively small. In the practical application of the mechanical packer, an annular rubber ring (the inner diameter of which is smaller than the outer diameter of the steel pile and is positioned below a gap block) fixed on the inner diameter surface of a sleeve is easy to fail due to the damage of the sharp right angle of the outer surface of the bottom of the steel pile in the pile inserting and piling processes. Due to the structural design defects of the mechanical packer, the overall damage ratio of the mechanical packer in practical application is high, and the mechanical packer is only suitable for shallow water pipe jackets and steel piles with small diameters.

The passive Crux packer adopts an external force mode 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 (the circle center is added with flexible reinforcing materials), 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 restraining 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 horizontally arranged in the prior art is squeezed and transformed into the rubber ring arranged in the vertical direction. After the steel pile passes through the circular ring, the expansion of the inner diameter of the circular ring enables the circular ring to be tightly attached to the surface of the outer diameter of the steel pile, so that the effect of blocking mud from entering the annular space is achieved. Meanwhile, the elastic restoring force generated by the rubber ring extruded into a vertical state forms the plugging force to cement paste in the grouting process. When the packer is used for deepwater jacket installation, the outer diameter surface of the steel pile is usually provided with equally spaced shear keys, and the shear keys are welded on the outer diameter surface of the steel pile by using reinforcing bars for enhancing the shear resistance of cement in the vertical direction. The circular ring of the Crux packer must allow the passage of the steel piles in which the shear keys are installed. The structural design of the Crux packer has the following disadvantages: the horizontally arranged rubber ring is easily scratched or damaged by the sharp right angle on the outer surface of the bottom of the steel pile in the pile inserting process. The offshore jacket installation statistics show that: the overall failure rate of the Crux packer is higher than 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 traditional inflatable packer or passive packer widely applied in the market at present has the defects of different forms. Therefore, there is a need for a new passive packer that can block cement slurry during grouting by an external force different from the above-mentioned one, and that can be used at a lower breakage rate than the above-mentioned conventional inflatable packer.

U.S. patent No. 9,677,241, inventor James Lee, chinese name: the Li Jun firstly provides a novel passive packer in 2014 8, and the external force of the passive packer depends on the gravity of cement paste. The design principle of the utility model is as follows: the annular rubber bag is filled in the grouting process, and the pressure difference between the pressure generated by the gravity of cement paste (specific gravity: 1.92g/cm3) in the cavity and the pressure generated by the gravity of seawater outside the cavity of the annular rubber bag (specific gravity: 1.05g/cm3) is used as an external force to realize the plugging of the cement paste in the grouting process. Since the cement paste is liquid in the grouting process, the pressure difference can generate pressure in the vertical direction and also generate pressure with the same size as the pressure in the vertical direction in the horizontal direction. The vertical force 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 horizontal force forms the plugging force to cement paste in the grouting process through the positive pressure between the inner side surface of the annular rubber bag and the outer surface of the steel pile. With the increase of the pressure difference (the height of the cement column), the sealing effect of the inner surface of the annular rubber bag to the outer surface of the steel pile is improved. The plugging function in the grouting process is similar to the form of the traditional inflatable packer, but the external force 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 plugging pressure of the inner surface acting in the cavity (height of 0.4 meter) of the annular rubber bag to the outer surface of the steel pile is more 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 rubber belts added with the 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 among the rubber belts provide channels for cement slurry to enter the cavity of the annular rubber bag; the middle part of the annular rubber bag is an annular rubber sleeve which is added with fiber reinforced material and has the inner diameter slightly smaller than the diameter of the steel pile; the connecting section of the rubber sleeve and the rubber belt is a conical rubber layer; the bottom of the annular rubber bag is connected with a sealing structure which is fixed on the surface of the inner diameter 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 the patent successor to the new passive packer us patent mentioned above, us patent No. 9,970,171, inventor James Lee, chinese name, in 5 months 2017: the Lijun proposes two improved methods: 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 horizontal annular bottom plate functions to reduce the radial width of the gap and supports a portion of the vertical gravity with the annular bottom plate to reduce the load that the vertical gravity bears on the annular rubber bag side rubber layer and the connecting member on the sleeve inner diameter surface. The cone-shaped bottom supporting plate can play a similar function of a horizontal annular bottom supporting plate, and can also cooperate with the bottom structure of the annular rubber bag to block the gap. The function of blocking the gap 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 load 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 will bulge and deform greatly after the top of the gap is loaded by cement paste, so that local stress concentration is generated, and the thin rubber layer is easily damaged. The improvement is that a thickened rubber ring is added at the surface position of the thin rubber layer at the top of the gap, and the locally reinforced design can reduce the bulging and deformation of the gap section, thereby reducing the possibility of breakage. With the two improved inventions, the total weight of the annular rubber bag can be greatly reduced. The reduction of the total weight of the annular rubber bag not only can reduce the manufacturing cost, but also is convenient for transportation and field installation. In addition, the rubber ring which is locally thickened at the top of the gap can be combined with the conical bottom supporting plate to generate a function of blocking the gap, so that the reliability of the system for blocking cement slurry is further improved (a packer which is independent and has double-safety blocking is formed).

The annular rubber bag mentioned by the novel passive packer or the improved passive packer needs to have 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 at 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 price for this 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 a sharp right angle of the outer surface of the bottom of the steel pile during insertion, pile discharging and pile driving of the steel pile; 2) the traditional rubber layer and the fixed connection parts on the inner surface of the sleeve must bear the main gravity of cement paste; 3) at the top of the gap, it must assume not only the structural support function across the gap under pressure, but also the grout sealing function of different gap sizes.

Jacket offshore installations have been in the past 60 years old and experienced. The size of the gap between the sleeve at the bottom of the deepwater jacket and the steel pile is standardized. Most steel piles used in deepwater jackets are around 2 meters in diameter, 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 also 50 mm. If a horizontal annular bottom support plate with the width of 40mm is adopted (the radial width of the annular bottom support plate must be smaller than the width of the gap block), the designed gap which must be blocked at the bottom of the annular rubber bag of the packer is 60mm (the maximum gap is 50mm +50mm-40 mm). A gap of this size is adequate with the improved passive packer described above.

The installation of offshore wind turbines is a new industry that has recently developed. Offshore wind turbines are generally composed of an upper and a lower part: the upper part is a blade and motor part; the lower part is a supporting structure, and the lower part supporting structure usually adopts a structure of a single steel pile or a plurality of steel piles with large diameter. When a multi-steel-pile structure is adopted, the respective piling operation of a plurality of steel piles is usually completed firstly, then the steel piles are used as sleeves for inserting the bottom vertical sections of a plurality of main legs of a fan support during offshore operation (the bottoms of the sleeves are driven into the sea bottom, and the tops of the sleeves are higher than the horizontal plane), meanwhile, an underwater packer is arranged at the lower parts of the bottom vertical sections of the main legs, and a grouting pipeline system is arranged on the surface of the inner diameter of the bottom of the main legs. Because the piling of the steel piles is independently finished, the precision control of the distance between the steel piles is limited, and the generated distance error is possibly larger, so that the requirement on the treatment capacity of the clearance of the packer is correspondingly larger. The offshore wind turbine is usually installed in a shallow sea area, and the storm during offshore installation operation is very small.

The underwater packer for installing the fan has the clearance requirement of possibly 120-300 mm. In the face of such large gaps, the above passive packers based on the annular rubber bag bottom structure (adding fiber reinforcement to reinforce the structural strength of the rubber layer) are insufficient. The major challenge faced by subsea packers for offshore installation of wind turbines is the above-mentioned oversized clearance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to disclose an improved underwater packer which can block gaps with any size, 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 inside the outer pile, the outer pile and the sleeve forming an annular gap, the improved underwater packer being installed on an 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 of the annular sealing bag is pulled by a pulling part, the inner side of the annular sealing bag is pressed and held by a pressing part, and the outlet of the grouting pipeline is connected with the inlet of the annular sealing bag; 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 and holding 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 and held by the annular upper plate and the annular lower plate together, 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 tightly attached to the outer wall of the sleeve or the inner wall of the outer pile.

In some embodiments, the first steel ring is sleeved on the first stud and presses and holds the annular sealing bag, and the first steel ring is pressed and held by the annular upper plate and the annular lower plate together.

In some embodiments, the annular upper plate and the annular lower plate press-fit surfaces are concavo-convex.

In some embodiments, the tension member comprises a plurality of second steel loops, a plurality of elastic tension cords, a plurality of third steel loops; 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 installed 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 piece, and two ends of the strip-shaped bag piece 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 seabed sludge adhered to 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 an annular support plate upper surface.

In some embodiments, a plurality of reinforcing plates are attached to the outer surface of the flap.

Compared with the prior art, the utility model has the beneficial effects that: the improved underwater packer provided by the utility model can be used for plugging any gap, simplifies the structure, has a good sealing effect and can effectively prevent slurry leakage.

Drawings

FIG. 1 is a schematic illustration of an improved subsea packer according to the present invention in an unset state;

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

FIG. 3 is a schematic illustration of another embodiment of an improved subsea packer according to the present invention in an unsintered 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 pressing member according to the present invention;

FIG. 6 is a schematic view of the construction of the tension member of the present invention;

FIG. 7 is a schematic view of the construction of the annular sealed 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 is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

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 external pile 1 is inserted into a sea bottom line b, and the top ends of the external pile 1 and the sleeve 2 exceed a sea level a.

The improved subsea packer is installed in the annular gap 8. The use of the improved subsea 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, i.e. the outer pile 1 centre line and the sleeve 2 centre line may or may not overlap.

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 a grouting pipeline 7.

The pressing and holding part 5 and the pulling part 4 are connected on 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 wind turbine, as shown in fig. 1 and 2, the pressing and holding part 5 and the pulling part 4 are connected to the outer wall of the sleeve 2, and when the improved underwater packer is used for offshore installation of a jacket, as shown in fig. 3 and 4, the pressing and holding part 5 and the pulling part 4 are connected to the inner wall of the outer pile 1, the working principle of the two installation modes is the same, and for avoiding redundancy, in this embodiment, the installation mode in which the pressing and holding part 5 and the pulling part 4 are connected to the outer wall of the sleeve 2 is specifically described.

The bottom of sleeve 2 is equipped with conical plug 21, be equipped with annular rubber cleaning plate 22 on the plug 21, annular rubber cleaning plate 22 and the laminating of outer stake 1 inner wall for clean outer stake 1 inner wall 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-shaped bag, and two ends of the strip-shaped bag sheet 30 are connected by a zipper and sealed by sealant to prevent slurry leakage. A plurality of third steel rings 33 are arranged on the upper edge of the strip-shaped bag sheet 30, namely the outer side edge 31 of the annular sealing bag 3, and an annular strip 34 is arranged on the lower edge of the strip-shaped bag sheet 30, namely the inner side edge 32 of the annular sealing bag 3.

As shown in fig. 7 and 8, the turning plates 6 are uniformly distributed on the annular sealing bag 3 at intervals, and the turning plates 6 are connected with a plurality of reinforcing plates 62, so that the bearing capacity of the turning plates 6 is greatly improved, supporting force can be provided for the annular sealing bag 3, and the annular sealing bag 3 is prevented from dropping to cause slurry leakage. The turning plate 6 is a curved surface turning plate. The novel sealing device further comprises a second bolt 61 and a second nut 610 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 move synchronously. In addition, a sealing gasket is 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 part 4, and the inner side edge 32 of the annular sealing bag 3 is pressed and held by the pressing and holding part 5, so that the annular sealing bag 3 is supported, the annular sealing bag 3 keeps a normal shape, the annular sealing bag is prevented from being paralyzed and softened, and grouting is facilitated.

As shown in fig. 5, 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 uniformly connected to the annular lower plate 52 at intervals, an annular upper plate 55 fitted over the first studs 53 and press-fitted with 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 on the first stud 53 and is jointly pressed and held by an annular upper plate 55 and an 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 are in staggered contact, so that accurate positioning is facilitated.

The inboard edge 32 of annular sealing bag 3 is equipped with annular strip 34, annular strip 34 and the inseparable laminating of sleeve 2 outer wall play sealed effect, prevent that annular sealing bag 3 and sleeve 2 outer wall clearance from leaking the thick liquid.

The sealing device further comprises a first steel ring 56 which is sleeved on the first stud 53 and presses and holds the annular sealing bag 3, the first steel ring 56 is pressed and held by the annular upper plate 55 and the annular lower plate 52, a sealing effect is achieved, and slurry leakage in a gap between the outer walls of the annular sealing bag 3 and the first stud 53 is prevented.

As shown in fig. 6, the pulling member 4 comprises a plurality of second steel rings 42, a plurality of elastic tension cords 41, and a plurality of third steel rings 33. The second steel ring 42 is connected to the outer wall of the sleeve 2 and is uniformly distributed on the outer wall of the sleeve 2 at intervals, the top end of the elastic tensioning rope 41 is connected to the second steel ring 42, the third steel ring 33 is installed on the annular sealing bag 3, and the bottom end of the elastic tensioning rope 41 is connected to the third steel ring 33. The elastic tensioning line 41 has a certain elasticity, so as to adapt to the state of the annular sealing bag 3. The elastic tensioning line 41 is preferably a nylon line.

The grouting line 7 is installed on the inner wall of the sleeve 2, and the outlet of the grouting line 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 is pressed to turn the turning plate 6 to turn over and seal the annular gap 8, specifically, the bottom end of the turning plate assembly is abutted to a junction point between 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 is abutted to the inner wall of the outer pile 1 to seal the annular gap 8, and the annular sealing bag 3 is partially attached to the inner wall of the outer pile 1.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by 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 of the annular sealing bag is pulled by a pulling part, the inner side of the annular sealing bag is pressed and held by a pressing part, and the outlet of the grouting pipeline is connected with the inlet of the annular sealing bag; the pressing and holding component and the drawing 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 plug the annular gap.

2. The improved underwater packer as claimed in claim 1, wherein the pressing 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 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 and held by the annular upper plate and the annular lower plate together, and the annular supporting plate is connected to the outer wall of the sleeve or the inner wall of the outer pile.

3. An improved underwater packer as claimed in claim 2, wherein the inner side of the annular sealing bag is provided with an annular strip which is in close contact with 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 disposed over the first stud and pressing against the annular sealing pocket, the first steel ring being pressed together by the annular upper plate and the annular lower plate.

5. An improved underwater packer as in claim 4 wherein the upper and lower annular plates have mating surfaces that are concave-convex.

6. An improved underwater packer as in claim 1, wherein the tension member comprises a plurality of second steel rings, a plurality of elastic tension cords, 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 installed on the annular sealing bag, and the bottom end of the elastic tensioning rope is connected to the third steel ring.

7. An improved underwater packer as in claim 1, wherein the annular sealing bag is formed by folding a strip-shaped bag piece, and both ends of the strip-shaped bag piece are connected by a zipper.

8. An improved underwater packer as claimed in claim 1, wherein 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 seabed sludge adhered to the inner surface of the sleeve, and the annular rubber cleaning plate is attached to the inner wall of the outer pile.

9. An improved subsea packer as in claim 2, where the bottom end of the flap abuts an upper surface of an annular support plate.

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

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