CN219406836U - Buoy assembly for offshore platform and offshore platform - Google Patents

Abstract

The disclosure provides a buoy assembly for an offshore platform and the offshore platform, wherein the buoy assembly comprises N cylinders with buoyancy and a beam fixing structure for fixing the N cylinders, and N is a positive integer greater than 1; the pontoon comprises a drum made of a light-weight material having a density less than sea water. When the pontoon assembly is positioned in the sea, the barrel can provide buoyancy for the pontoon assembly; meanwhile, the beam fixing structure is used for fixing the barrel, and the weight of the pontoon assembly can be reduced because the beam fixing structure only uses a small amount of steel materials.

Description

Buoy assembly for offshore platform and offshore platform

Technical Field

The present disclosure relates to the field of buoys, and more particularly, but not exclusively, to a buoy assembly for an offshore platform and an offshore platform.

Background

The offshore floating structure is a foundation for constructing an offshore platform, and the existing offshore floating structure is usually a steel hull and is formed by combining a plurality of steel pontoons. For example, a column floating type wind power foundation, and the inside of a steel ship body is designed in a form of a stiffened plate, so as to provide buoyancy, stability and resistance to external water pressure for the floating body or bear other internal and external loads.

Steel structural pontoons are typically heavy, relatively expensive to build and material, and are also susceptible to seawater corrosion; the inflatable rubber buoy for replacing the steel buoy has short service cycle, can not keep an inflated state for a long time, and has a certain influence on safety due to the possibility of damage caused by the composition of a rubber structure.

Disclosure of Invention

The present disclosure provides a buoy assembly for an offshore platform and an offshore platform to improve safety of buoy use.

In a first aspect, the present disclosure provides a buoy assembly for an offshore platform, comprising: the buoyancy device comprises N buoys with buoyancy and a beam fixing structure for fixing the N buoys, wherein N is a positive integer greater than 1; the pontoon comprises a drum made of a lightweight material having a density less than sea water.

In some possible embodiments, the pontoon further comprises a protective structure, the protective structure being wrapped around the outer surface of the pontoon; when the pontoon assembly is positioned in the sea, the barrel supports the protective structure so that the protective structure is not deformed.

In some possible embodiments, the beam-fixing structure comprises: the central upright post, the binding structure and the top cover structure; the N buoys encircle the central upright post and are fixed on the periphery of the central upright post through the binding of the binding structure; the top cap structure sets up the top at N flotation pontoon, and when the flotation pontoon subassembly was located the sea water, top cap structure was spacing to N flotation pontoon.

In some possible embodiments, the N pontoons are symmetrically disposed about the central column.

In some possible embodiments, the N buoys are distributed in Y layers in a vertical direction perpendicular to the sea level, where Y is an integer greater than or equal to 1 and less than or equal to N; the number of pontoons in each layer is the same and the pontoons in the Y layer share a central upright post.

In some possible embodiments, pontoons of adjacent layers are connected in a vertical direction perpendicular to the sea level; wherein, the one end that upper strata flotation pontoon kept away from top cap structure is connected with the one end that lower floor flotation pontoon is close to top cap structure.

In some possible embodiments, a surrounding wall structure is arranged between the two buoys connected at the upper and lower layers; the enclosing wall structure is coated on the connecting part of the two pontoons and forms a sealing space with the outer surfaces of the two pontoons.

In some possible embodiments, the pontoon assembly further comprises: a ballast structure for balancing the buoyancy and gravity of the pontoon assembly; the ballast structure is arranged at one end of the beam fixing structure immersed in the seawater.

In some possible embodiments, the cartridge employs at least one of the following materials: foam, plastic pipe, polypropylene pipe, acrylonitrile-butadiene-styrene copolymer carbon fiber.

In some possible embodiments, the pontoon is made of a lightweight material that is resistant to corrosion.

In a second aspect, the present disclosure provides an offshore platform comprising: a walking frame platform; one or more pontoon assemblies according to the first aspect; the pontoon assembly is fixedly connected with the walking frame platform and is used for providing buoyancy for the walking frame platform.

In the present disclosure, a pontoon assembly includes N pontoons having buoyancy and a beam fixing structure for fixing the N pontoons, the pontoons including a barrel made of a light-weight material having a density less than seawater, the barrel being capable of providing buoyancy to the pontoon assembly; meanwhile, the pontoon is fixed by using the beam fixing structure, and the weight of the pontoon assembly can be reduced because the beam fixing structure only uses a small amount of steel materials; the inside barrel that sets up of protection architecture makes the flotation pontoon subassembly lighter, easy to assemble, dismantles and change to the security is higher.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic view of a steel pontoon structure according to the related art;

FIG. 2 is a first structural schematic diagram of a buoy assembly for an offshore platform in an embodiment of the disclosure;

FIG. 3 is a second structural schematic diagram of a buoy assembly for an offshore platform in an embodiment of the disclosure;

FIG. 4 is a third structural schematic diagram of a buoy assembly for an offshore platform in an embodiment of the disclosure;

fig. 5 is a fourth structural schematic diagram of a buoy assembly for an offshore platform in an embodiment of the disclosure.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus consistent with some aspects of the disclosure as detailed in the accompanying claims.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

In order to illustrate the technical solutions described in the present disclosure, the following description is made by specific embodiments.

The offshore platform can be fixed or actively floating on the sea surface and can provide an offshore work platform for production work or other activities. The method is widely applied to providing a fixed observation platform for building lighthouses, radar tables, hydrological observation stations and the like, and providing a large-scale operation platform for building offshore wharfs, drilling and production of submarine petroleum and oil gas, fishing, energy power generation and the like.

The primary structure that enables the offshore platform to float on the sea surface is a buoyant structure, typically a buoyant pontoon. The existing offshore floating structures are mostly steel pontoon structures in the form of three columns or four columns, and the steel pontoon structures are mainly formed by combining a plurality of steel hollow cylinders. Such as the three column form steel pontoon structure shown in fig. 1. The pontoon structure comprises three hollow steel pontoons 11 and connecting columns 12 for fixing the pontoons. The end of the pontoon, which is immersed in the sea surface, is provided with an opening. The steel pontoon 11 may also be internally ribbed to provide buoyancy, stability and resistance to external water pressure, or to withstand other internal and external loads. However, steel buoys have the disadvantages of heavy weight, high material and construction costs, susceptibility to seawater corrosion, high difficulty in processing, and high process requirements.

In addition to the steel pontoon, the rubber inflatable pontoon is also applied to the floating of offshore platforms and ships on a large scale, but the rubber pontoon has the problems of short service period, incapability of keeping an inflated state for a long time (namely, the inflatable pontoon naturally spreads air), and possibility of damage due to the composition characteristics of a rubber structure, and has a certain influence on safety.

To solve the above problems, embodiments of the present application provide a buoy assembly for an offshore platform, which can be applied to the above offshore platform to provide a buoyancy force floating on the sea surface for the offshore platform.

FIG. 2 is a first structural schematic diagram of a pontoon assembly for an offshore platform according to an embodiment of the disclosure, and referring to FIG. 2, pontoon assembly 20 comprises: n buoys 201 with buoyancy and a tie-down structure 202 for fixing the N buoys 201; the N pontoons 201 are constructed of a light weight material having a density less than the seawater, and the barrel 2011 is configured to provide buoyancy to the pontoon assembly 20 when the pontoon assembly 20 is positioned in the seawater. Wherein N is a positive integer greater than 1.

Illustratively, referring to fig. 2, there are 6 buoys 201 (i.e., n=6) in buoy assembly 20, and these 6 buoys 201 are made up of cylinders 2011, i.e., there are 6 cylinders 2011 in buoy assembly 20. In fig. 2, buoy 201 in buoy assembly 20 is composed of only cylinder 2011. At the same time, these 6 cylinders 2011 are fixed by the beam fixing structure 202.

It should be noted that, buoy assembly 20 in fig. 2 includes 6 buoys 201, which is only an example, buoys 201 in buoy assembly 20 may be other numbers, and the number of buoys 201 and the size of buoys 201 may be specifically set according to the amount of buoyancy required by the offshore platform, which is not specifically limited in this embodiment of the disclosure.

In some possible embodiments, the barrel 2011 may employ at least one of the following materials: foam, plastic pipe, polypropylene pipe, acrylonitrile-butadiene-styrene copolymer carbon fiber.

It will be appreciated that the barrel 2011 may be a lighter weight, less dense material, i.e., a material that floats in sea water.

Fig. 3 is a schematic diagram of a second structure of a buoy assembly for an offshore platform according to an embodiment of the disclosure, referring to fig. 3, buoy 201 may further include a protection structure 2012, that is, buoy 201 is formed by a barrel 2011 and a protection structure 2012, and protection structure 2012 is wrapped on an outer surface of barrel 2011; when buoy assembly 20 is in sea water, barrel 2011 supports protective structure 2012 such that protective structure 2012 is not deformed.

It will be appreciated that N guard structures 2012 have a closed hollow cavity with a barrel 2011 inside, and that barrel 203 supports pontoon 201 when the pontoon assembly is in seawater, so that pontoon 201 is not deformed.

Illustratively, referring to fig. 3, there are 6 buoys 201 (i.e., n=6) in buoy assembly 20, and each of these 6 buoys 201 includes a cylinder 2011 and a guard structure 2012. In fig. 3, a cylinder 2011 and a protection structure 2012 constitute a buoy 201 in a buoy assembly 20. At the same time, these 6 pontoons 201 are fixed by a beam fixing structure 202.

Barrel 2011 may support the profile of buoy 201 inside guard structure 2012, leaving the profile of buoy 201 full.

In some possible embodiments, the guard structure 2012 is made of a lightweight material that is resistant to corrosion.

It will be appreciated that since the pontoon assembly 20 is partially submerged in sea water, which is highly corrosive, the guard 2012 may be made of a material that is resistant to corrosion in order to ensure a longer life span of the pontoon assembly 20. For example, it may be made of polytetrafluoroethylene (poly tetra fluoroethylene, PTFE), rubber, or the like.

It should be noted that buoy 201 may have any shape that can be placed in beam-fixing structure 202, such as an ellipsoid, a cylinder, a sphere, etc., and the embodiments of the present disclosure are not limited in particular.

The cylinder 2011 is placed in the hollow cavity of the protection structure 2012, and because the cylinder 2011 is made of a material with light weight and low density, the buoyancy provided by the cylinder 2011 can be maintained, and the function of supporting the protection structure 2012 can be achieved, so that the pontoon 201 cannot deform under the impact of sea waves.

It should be noted that, when buoy assembly 20 is located in the sea, buoy 201 will receive pressure from the sea, so buoy 201 is easy to deform, and the protection structure 2012 is used to cover the outside of barrel 2011 (i.e. barrel 2011 is placed in the hollow cavity of protection structure 2012), so that buoy 201 has a fixed profile, is not easy to be deformed due to the extrusion of the sea, and can bear a larger load. In addition, buoy 201 with cylinder 2011 inside is lighter and convenient to install, detach and replace.

In some possible embodiments, the beam-fixing structure 202 may include: a ligating structure and a top cover structure; the N buoys are fixed together through the binding of the binding structure; the top cap structure sets up the top at N flotation pontoon, and when the flotation pontoon subassembly was located the sea water, the top cap structure was used for spacing N flotation pontoons.

It will be appreciated that referring to FIG. 2, and taking N equal to 6 as an example, lashing structure 2021 secures 6 pontoons 201 together by lashing. Fig. 4 is a schematic diagram of a third configuration of a pontoon assembly for an offshore platform according to an embodiment of the disclosure, and referring to fig. 4, a top cover structure 2022 of a beam-fixing structure 202 is located above a pontoon 201, and the top cover structure 2022 can limit the pontoon 201 so that the pontoon 201 has a uniform height in a vertical direction perpendicular to the sea level when the pontoon assembly 20 is located in the sea.

When buoy assembly 20 is located in the sea, buoyancy generated by buoy 201 may be transferred from the outer wall of buoy 201 to cap structure 2022 connected to the outer wall of buoy 201, and then transferred from cap structure 2022 to the entire buoy assembly 20, so that buoy assembly 20 may float in the sea.

In some possible embodiments, referring to fig. 3, the tie down structure 202 may include a central post 2023 in addition to the ligating structure 2021 and the cap structure 2022; n pontoons 201 surround the center column 2023 and fix the periphery of the center column 2023 by lashing of the lashing structure 2021.

It will be appreciated that the beam-fixing structure 202 may include: a lashing structure 2021, a roof structure 2022, and a center post 2023. In the horizontal direction, the center column 2023 is located at the center position of the N buoys 201, so to speak, the N buoys 201 are wound around the center column 2023, and the N buoys 201 are symmetrically placed.

In some possible implementations, the center post 2023 and the top cover structure 2022 may be steel materials, and the ligature structure 2021 may be a locking tie, a bayonet tie, a fishbone tie, a ligature strap, etc., as embodiments of the disclosure are not specifically limited thereto. The central upright post can be hollow and cylindrical, so that the purpose of saving steel materials can be achieved.

It will be appreciated that in the beam-fixing structure 202 of the pontoon assembly 20, only the central column 2023 and the top cover structure 2022 are made of steel material, and the banding structure 2021 is made of band material, so that the use of steel materials of the entire pontoon assembly 20 can be greatly reduced, thereby saving cost.

In some possible embodiments, N pontoons 201 are symmetrically disposed about center column 2023.

It will be appreciated that N pontoons 201 are disposed around center column 2023, and that N pontoons 201 are symmetrically distributed in the diameter direction of center column 2023. In this manner, the buoyancy provided by the pontoon assembly 20 in the vertical sea level direction is the same as well as the gravity.

In some possible embodiments, the N buoys 201 are distributed in Y layers in a vertical direction perpendicular to the sea level, where Y is an integer greater than or equal to 1 and less than or equal to N; the number of pontoons 201 per deck is the same and pontoons 201 of the Y deck share a central column 2023.

It will be appreciated that buoy assembly 20 may include Y-level buoy 201, where Y is an integer greater than or equal to 1 and less than or equal to N, and where Y-level buoy 201 shares a central column 2023, it may be said that each level of buoy 201 in Y-level buoy 201 is symmetrically disposed about the same central column 2023. Fig. 5 is a schematic diagram of a fourth configuration of a pontoon assembly for an offshore platform according to an embodiment of the disclosure, and referring to fig. 5, when Y is equal to 2, i.e., there are 2 pontoons 201 in pontoon assembly 20, the pontoons 201 share a central column 2023.

In some possible embodiments, pontoons 201 of adjacent layers distributed up and down in a vertical direction perpendicular to the sea level are connected; wherein the end of upper buoy 201 remote from roof structure 2022 is connected to the end of lower buoy 201 near roof structure 2022.

It will be appreciated that when pontoons 201 in pontoon assembly 20 are more than one deck, pontoons 201 of adjacent decks are joined end-to-end. The pontoons 201 are arranged in multiple layers, the number of pontoons 201 on each layer is the same, the occupied area of the pontoon assembly 20 in the direction parallel to the sea level can be effectively reduced under the condition that the number of pontoons 01 is kept unchanged, and the dimension requirements of the offshore platform can be better met.

In some possible embodiments, a wall structure is provided between two pontoons 201 connected in upper and lower layers; the enclosing wall structure is wrapped on the connecting part of the two pontoons 201, and forms a sealed space with the outer surfaces of the two pontoons 201.

It will be appreciated that, referring to fig. 5, the enclosure wall structure 41 is wrapped around the connection portions of two pontoons 201 adjacent to each other in the first and second layers, and encloses a sealed space with the outer surfaces of the pontoons 201. Because pontoons 201 are ellipsoids, a plurality of pontoons 201 cannot be completely attached together. When the pontoon assembly 20 is designed in a multi-layer structure, the contact surface between two pontoons 201 adjacent to each other is provided with a certain gap, the sea water has a certain fluidity, the height of the pontoon 201 from the water surface line is changed to change the buoyancy to which the pontoon 201 is subjected, and the gap exists between the two pontoons 201 in the vertical direction of the sea surface, so that the two pontoons 201 are subjected to inconsistent buoyancy, and therefore, the two pontoons 201 need to be connected into a whole by arranging the enclosing wall structure 41.

Illustratively, the enclosure wall structure 41 may be a flexible steel sheet, or other waterproof material having toughness. The wall structure 41 may be fixed to the connection portion between two pontoons 201 by bonding, or may be fixed to the pontoons 201 by externally providing a tightening structure, which is not particularly limited in the embodiment of the disclosure.

In some possible embodiments, the buoy assembly 20 can further include: a ballast structure for balancing the buoyancy and gravity of the pontoon assembly 20; the ballast structure is disposed at an end of the beam-fixing structure 202 submerged in the sea.

It will be appreciated that, referring to fig. 4, to balance the buoyancy of the pontoon assembly 20 and the weight of the pontoon assembly 20 itself, and to design the depth at which the pontoon assembly 20 acts below sea level based on design requirements, ballast structures 31 may be added to the pontoon assembly 20 to lower the center of gravity of the pontoon assembly 20, the ballast structures 31 being disposed at the end of the beam-fixing structure 202 submerged in the sea and connected to a central column 2023 in the beam-fixing structure 202.

It should be noted that, the offshore platform providing different functions needs to be fixed at different locations on the sea, for example, the offshore terminal needs to provide an offshore platform above the sea level, the lighthouse using tidal power needs to have the generator set submerged below the sea level, and so on. Thus, by adding ballast structures of different weights and sizes to enable the pontoon assembly 20 to float in seawater at different depths, the pontoon assembly 20 is made to meet the different functional requirements of the offshore platform.

Illustratively, the ballast structure 31 may be cast using concrete. The ballast structure 31 is manufactured by concrete pouring, so that the manufacturing cost is low, the pouring shape can be matched with the shape of the pontoon 201, the ballast structure 31 and the pontoon 201 can be in bending fit, and the ballast structure 31 and the pontoon 201 are integrated, and no gap exists in the middle. There is no inconsistency in the buoyancy experienced due to the change in the water surface line, improving the stability of the pontoon assembly 20.

In one embodiment, referring to fig. 3-4, buoy assembly 20 is illustrated with N equal to 6, lashing structure 2021 being a lashing strap, and barrel 2011 being foam. As shown in fig. 3 to 4, buoy assembly 20 includes 6 buoys 201, 1 center column 2023, lashing strap 2022, cap structure 2022, rubber made protective structure 2012, foam made cylinder 2011 and ballast structure 31. Tie-down straps 2022 secure 6 pontoons 201 around center column 2023, and these 6 pontoons 201 are symmetrically disposed such that buoyancy provided by pontoon assembly 20 in the vertical direction is uniform; the top cover structure 2022 is located above the 6 buoys 201, when the buoy assembly 20 is located in the sea, the buoys 201 are floated upwards by buoyancy, the top cover structure 2022 can fix the 6 buoys 201 at the same height and make the buoys 20 subjected to buoyancy in the vertical direction perpendicular to the sea level uniform, in addition, the 6 buoys 201 transmit the buoyancy from the buoys 201 to the top cover structure 2022 through contact with the top cover structure 2022, and then to the whole buoy assembly 20, and the buoy assembly 20 can provide buoyancy for the offshore platform; buoy 201 is composed of barrel 2011 and protection structure 2022, barrel 2011 made of foam can support protection structure 2022 with hollow cavity, so that buoy 201 cannot deform under the impact of sea wave, and barrel 2011 made of foam has small weight and low density and can keep buoyancy of buoy 201; in order to balance the buoyancy and gravity of buoy assembly 20, a ballast structure 31 is further arranged at the bottom of buoy 201, ballast structure 31 is formed by pouring concrete, and is attached to the shape of the outer wall of buoy 201, and ballast structure 31 is connected with a central upright 2023 for fixing the ballast structure.

In the embodiment of the disclosure, the pontoon assembly comprises N pontoons with buoyancy and a beam fixing structure for fixing the N pontoons, wherein the pontoons comprise a barrel made of a light-weight material with density less than that of seawater, and the barrel can provide buoyancy for the pontoon assembly; meanwhile, the pontoon is fixed by using the beam fixing structure, and the weight of the pontoon assembly can be reduced because the beam fixing structure only uses a small amount of steel materials; the inside barrel that sets up of protection architecture makes the flotation pontoon subassembly lighter, easy to assemble, dismantles and change to the security is higher.

Based on the same inventive concept, embodiments of the present disclosure provide an offshore platform including: a row rack platform, one or more pontoon assemblies 20 as described above; wherein, pontoon assembly 20 is fixedly connected with the row frame platform for providing buoyancy to the row frame platform.

By way of example, the offshore platform may be an offshore power generation platform for wind power generation, the offshore power generation platform comprising a racking platform and a pontoon assembly, the pontoon assembly being connected to the racking platform, the offshore power generation platform providing buoyancy through the pontoon assembly during use such that at least a portion of the offshore power generation platform is above sea level.

It will be understood by those skilled in the art that the sequence number of each step in the above embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present disclosure.

The above-described embodiments are only for illustrating the technical aspects of the present disclosure, and are not limiting thereof; although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the disclosure, and are intended to be included in the scope of the present disclosure.

Claims (10)

1. A pontoon assembly for an offshore platform, comprising: the buoyancy-based floating device comprises N buoys and a beam fixing structure for fixing the N buoys, wherein N is a positive integer greater than 1;

the pontoon comprises a drum made of a lightweight material having a density less than sea water.

2. The pontoon assembly according to claim 1, wherein the pontoon further comprises a protective structure, the protective structure being wrapped around an outer surface of the column; when the pontoon assembly is positioned in the sea, the barrel supports the protective structure such that the protective structure is not deformed.

3. A pontoon assembly according to claim 1 or 2, wherein the beam-fixing structure comprises: the central upright post, the binding structure and the top cover structure;

the N pontoons encircle the central upright post and are fixed on the periphery of the central upright post through the binding of the binding structure;

the top cover structure is arranged above the N buoys, and limits the N buoys when the buoy assembly is positioned in seawater.

4. The pontoon assembly according to claim 3, wherein the pontoon assembly comprises a plurality of floating members,

the N buoys are symmetrically placed around the center column.

5. The pontoon assembly according to claim 3, wherein the pontoon assembly comprises a plurality of floating members,

the N buoys are distributed in a Y layer in the vertical direction perpendicular to the sea level, and the value of Y is an integer which is more than or equal to 1 and less than or equal to N;

the number of pontoons in each layer is the same and one central upright is shared.

6. The pontoon assembly according to claim 5, wherein the pontoon assembly comprises a plurality of floating members,

in the vertical direction perpendicular to the sea level, the pontoons of adjacent layers distributed up and down are connected;

wherein, upper pontoon keeps away from the one end of top cap structure is connected with the one end that lower floor's pontoon is close to the top cap structure.

7. The pontoon assembly according to claim 6, wherein the pontoon assembly comprises a plurality of floating members,

a surrounding wall structure is arranged between the two buoys connected with the upper layer and the lower layer;

the surrounding wall structure is coated on the connecting part of the two pontoons and forms a sealing space with the outer surfaces of the two pontoons.

8. A pontoon assembly according to claim 3, wherein the pontoon assembly further comprises: a ballast structure for balancing the buoyancy and gravity of the pontoon assembly; the ballast structure is arranged at one end of the beam fixing structure immersed in the seawater.

9. The pontoon assembly according to claim 1, wherein the barrel is made of at least one of: foam, plastic pipe, polypropylene pipe, acrylonitrile-butadiene-styrene copolymer carbon fiber.

10. An offshore platform, comprising:

a walking frame platform;

one or more buoy assemblies according to any one of claims 1 to 9;

the pontoon assembly is fixedly connected with the walking frame platform and is used for providing buoyancy for the walking frame platform.