A jack-up platform and a leg with an internal conduit and a boarding structure

Abstract

The present invention relates to the technical field of offshore platforms, and discloses a jack-up platform and a leg with an internal conduit and a boarding structure. The jack-up platform includes a main platform, at least three legs, and a lifting and fixing device. The main platform is installed on the legs in a lifting and moving manner. The lifting and fixing device is arranged on the main platform and is in transmission cooperation with the legs. The leg includes a tubular housing and a conduit fixed in the tubular housing. The shape of the conduit is J-shaped, and the conduit communicates with the side wall holes of the tubular housing. An opening is formed on one side of the tubular housing, and a partition plate and a side plate are arranged inside the opening to form a berthing area outside the opening. An upper chamber is further arranged inside the tubular housing. A berthing anti-collision column and a ladder are installed at the opening, and the ladder extends into the upper chamber. A boarding step ladder is installed in the upper chamber, and an inner platform is further arranged on the upper side of the upper chamber. The boarding step ladder extends to the inner platform. An operation and maintenance vessel can effectively abut against the berthing anti-collision column at the opening to ensure that personnel can safely and smoothly board the platform.

Description

Technical Field

[0001] The invention relates to the technical field of offshore platforms, in particular to a self-elevating platform and pile legs with built-in conduits and boarding structures. Background Art

[0002] As offshore wind power develops further into the deep sea, the scale of wind farms is getting larger and larger, resulting in the weight of the superstructure of the booster station gradually increasing. At present, the weight of a 1000MW wind farm booster station reaches more than 6500t. If the traditional jacket foundation is used, it will lead to a series of problems such as high installation cost of the booster station, long construction period, and shortage of construction resources.

[0003] The self-elevating booster station platform can save the large floating crane for lifting the superstructure and the pile-driving ship for piling, and will become the development direction of large booster station platforms in the future. Existing self-elevating platforms such as the Chinese utility model patent with authorization announcement number CN216275573U and authorization announcement date 2022.04.12 disclose a self-elevating fishing platform, which specifically includes a platform, a power source and at least three pile legs driven by the power source that can be raised and lowered, and a boarding ramp is provided on one side of the platform. The pile legs include a first position at the bottom for contacting the underwater ground and a second position at which the bottom leaves the underwater ground when raised. The boarding ramp includes a frame, and stairs are provided inside the frame. The boarding ramp facilitates people to get on and off the platform.

[0004] Existing self-elevating platforms are equipped with a boarding ladder on one side of the platform. However, it is difficult to implement landing by ship when the platform working surface is high, which cannot meet the working requirements of the offshore booster station. In addition, the operation and maintenance vessel cannot effectively approach the platform during landing, resulting in difficulty and risk for the operation and maintenance personnel to land. Summary of the invention

[0005] The technical problem to be solved by the present invention is that it is difficult to implement ship landing when the platform operating surface is high, which cannot meet the working requirements of the offshore booster station; and the operation and maintenance vessel cannot effectively approach the platform during landing, resulting in great difficulty and risk for the operation and maintenance personnel to land.

[0006] In order to solve the above technical problems, the present invention provides a self-elevating platform:

[0007] The self-elevating platform comprises a main platform, at least three pile legs and a lifting and fixing device, wherein the main platform is installed on at least three pile legs for lifting and movement, and the lifting and fixing device is arranged on the main platform, and the lifting and fixing device cooperates with the pile legs for driving the main platform to lift and move and fix the main platform;

[0008] The pile leg includes a tubular housing and a conduit. The conduit is fixedly arranged in the tubular housing. The shape of the conduit is J-shaped. One end of the conduit is at the upper part of the tubular housing, and the other end of the conduit communicates with the side wall hole of the tubular housing.

[0009] An opening is provided on one side of the tubular housing. A partition board and a side board are arranged inside the opening to form a berthing area outside the opening. An upper chamber is also provided inside the tubular housing, and the upper chamber is located above the opening.

[0010] A berthing anti-collision column and a ladder are installed at the opening. The ladder extends into the upper chamber. A boarding ladder is installed in the upper chamber, and an inner platform is also provided above the upper chamber. The boarding ladder extends to the inner platform.

[0011] Further, at least three conduits are provided. At least three conduits are symmetrically distributed about the central axis of the tubular housing. The upper ends of the conduits are fixedly inserted on the inner platform, and a first reinforcing plate is also provided between the lower ends of the conduits and the tubular housing.

[0012] Further, the conduit includes a vertically arranged section and a bent section which are fixedly connected. The vertically arranged section extends parallel to the axis direction of the tubular housing. A flared opening is provided at the lower end of the bent section, and the flared opening communicates with the side wall hole of the tubular housing.

[0013] Further, a central sleeve is provided inside the tubular housing. The central sleeve penetrates through the upper chamber and the berthing area from top to bottom. At least three conduits are fixedly installed in the central sleeve.

[0014] Further, two partition boards and two side boards are provided. The two partition boards are respectively arranged at the upper and lower parts of the opening. The two side boards are respectively arranged on both sides of the opening. The two partition boards and the two side boards are fixedly connected between the central sleeve and the tubular housing.

[0015] Further, a plurality of second reinforcing plates are also provided on the side of the side board facing away from the berthing area. The second reinforcing plates are fixedly connected between the central sleeve and the tubular housing. The plurality of second reinforcing plates are spaced apart along the axis direction of the tubular housing.

[0016] Further, the berthing anti-collision columns are spaced apart and arranged outside the central sleeve. A plurality of support rods are fixed between the berthing anti-collision columns and the central sleeve. The ladder extends parallel to the axial direction of the tubular housing, and the ladder is arranged inside the berthing anti-collision columns.

[0017] Furthermore, two fender anti-collision columns are arranged in parallel at intervals. The ladder includes a first section of ladder and a second section of ladder. The first section of ladder is arranged between the two fender anti-collision columns. The second section of ladder is arranged above the first section of ladder, and the second section of ladder extends into the interior of the upper chamber.

[0018] Furthermore, the boarding ladder is arranged spirally around the outer peripheral wall of the central sleeve, and the inner platform is provided with an avoidance opening corresponding to the boarding ladder; a manhole is further provided at the upper end of the tubular shell, and the manhole is arranged above the inner platform, and the manhole is higher than or flush with the upper surface of the main platform.

[0019] At the same time, the present invention also provides a leg with an internal conduit and a boarding structure:

[0020] The leg with an internal conduit and a boarding structure includes a tubular shell and a conduit. The conduit is fixedly arranged in the tubular shell. The shape of the conduit is J-shaped. One end of the conduit is at the upper part of the tubular shell, and the other end of the conduit is communicated with the side wall hole of the tubular shell;

[0021] An opening is provided on one side of the tubular shell, and a partition plate and a side plate are arranged inside the opening to form a fender area outside the opening; an upper chamber is further arranged inside the tubular shell, and the upper chamber is located above the opening;

[0022] A fender anti-collision column and a ladder are installed at the opening, and the ladder extends into the interior of the upper chamber; a boarding ladder is installed in the upper chamber, and an inner platform is further arranged above the upper chamber, and the boarding ladder extends to the inner platform.

[0023] Furthermore, at least three conduits are provided, and at least three conduits are centrally symmetrically distributed about the central axis of the tubular shell. The upper ends of the conduits are fixedly inserted on the inner platform, and a first reinforcing plate is further arranged between the lower ends of the conduits and the tubular shell.

[0024] Furthermore, the conduit includes a vertical section and a bent section fixedly connected. The vertical section extends in a direction parallel to the axis of the tubular shell, and a flared opening is arranged at the lower end of the bent section, and the flared opening is communicated with the side wall hole of the tubular shell.

[0025] Furthermore, a central sleeve is arranged inside the tubular shell. The central sleeve penetrates through the upper chamber and the fender area from top to bottom, and at least three conduits are fixedly installed in the central sleeve.

[0026] Furthermore, there are two partition plates and two side plates. The two partition plates are respectively arranged at the upper and lower parts of the opening, and the two side plates are respectively arranged on both sides of the opening. The two partition plates and the two side plates are fixedly connected between the central sleeve and the tubular housing.

[0027] Furthermore, on the side of the side plate facing away from the berthing area, a plurality of second reinforcing plates are also provided. The second reinforcing plates are fixedly connected between the central sleeve and the tubular housing, and the plurality of second reinforcing plates are spaced apart along the axial direction of the tubular housing.

[0028] Furthermore, the berthing anti-collision columns are arranged at intervals outside the central sleeve. A plurality of support rods are fixed between the berthing anti-collision columns and the central sleeve. The ladder extends parallel to the axial direction of the tubular housing and is arranged inside the berthing anti-collision columns.

[0029] Furthermore, there are two berthing anti-collision columns arranged in parallel at intervals. The ladder includes a first section of ladder and a second section of ladder. The first section of ladder is arranged between the two berthing anti-collision columns, and the second section of ladder is arranged above the first section of ladder and extends into the interior of the upper chamber.

[0030] Furthermore, the access ladder is arranged in a spiral shape around the outer peripheral wall of the central sleeve. The inner platform is provided with an avoidance opening corresponding to the access ladder; a manhole is also provided at the upper end of the tubular housing. The manhole is arranged above the inner platform and is higher than or flush with the upper surface of the main platform.

[0031] Compared with the prior art, the beneficial effects of the self-elevating platform, the pile leg with an internal conduit and a boarding structure in an embodiment of the present invention are as follows: The self-elevating platform adopts a design form of a main platform, at least three pile legs, and a lifting and fixing device. The main platform is installed on at least three pile legs in a lifting and moving manner, and the lifting and fixing device is arranged on the main platform and is in transmission cooperation with the pile legs; when the main platform needs to be lifted or lowered, the lifting and fixing device generates a driving force on the pile legs to enable the main platform to move up and down relative to the pile legs; after moving into place, the pile legs are locked by the lifting and fixing device to fix the relative position between the pile legs and the main platform, ensuring that the main platform is stably maintained at the set height of the pile legs.

[0032] Since the pile leg includes a tubular shell and a conduit fixed in the tubular shell, the conduit is in a J-shape, one end of the conduit is located at the upper part of the tubular shell, and the other end of the conduit is connected to the side wall hole of the tubular shell. A submarine cable channel is constructed inside the pile leg by using the conduit, and the submarine cable channel enters the conduit from the side wall hole. The submarine cable can be stripped after reaching the submarine cable anchoring device at the upper part of the tubular shell along the conduit. After stripping the armor, the submarine cable enters the first deck of the booster station along the inner platform. An opening is reserved at the pile leg corresponding to the first deck for the submarine cable to enter, and the opening can be combined with the manhole.

[0033] Among them, an opening is opened on one side of the tubular shell, and partitions and side panels are arranged on the inner side of the opening. The inner side of the opening is closed by the partitions and side panels, and a berthing area is formed outside the opening. The height position of the berthing area is set at the pile legs. The berthing area is equivalent to or slightly higher than the sea level, ensuring that the operation and maintenance vessels can effectively abut the berthing anti-collision columns at the opening, and the berthing and landing will not be affected by the high platform working surface, thereby meeting the working requirements of the offshore booster station.

[0034] Moreover, when the maintenance vessel is against the berthing area, the vessel is prevented from rising and falling too much relative to the platform, and the maintenance personnel can safely enter the inner side of the opening. The berthing area is integrated on the pile leg to prevent the normal lifting function of the pile leg from being affected by the protruding parts on the outside of the pile leg. In addition, the ladder extends to the interior of the upper chamber, and a boarding step ladder is installed in the upper chamber. An inner platform is also provided on the upper side of the upper chamber, and the boarding step ladder extends to the inner platform. The maintenance personnel enter the upper chamber through the ladder, and then use the boarding step ladder to go up to the inner platform. The inner platform is connected to the main platform, thereby achieving the purpose of personnel safely and smoothly boarding the first deck of the platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional schematic diagram of a self-elevating platform in an embodiment of the present invention;

[0036] Figure 2 is a three-dimensional cross-sectional view of a pile leg of a jack-up platform in an embodiment of the present invention;

[0037] Figure 3 is an internal structural diagram of a pile leg of a self-elevating platform in an embodiment of the present invention;

[0038] In the figure, 1 - main platform, 2 - leg, 21 - tubular shell, 211 - side wall hole, 212 - manhole, 22 - guide pipe, 221 - vertical section, 222 - bending section, 223 - bell mouth, 224 - first reinforcing plate, 23 - open end, 230 - berthing area, 231 - partition board, 232 - side plate, 233 - berthing anti-collision column, 234 - ladder, 2341 - first section of ladder, 2342 - second section of ladder, 235 - second reinforcing plate, 24 - upper chamber, 241 - boarding ladder, 242 - inner platform, 243 - avoidance opening, 25 - central sleeve, 3 - lifting fixing device. Detailed implementation manners

[0039] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] As Figures 1 to 3As shown in the figure, a jack-up platform according to an embodiment of the present invention includes a main platform 1, at least three leg columns 2, and a lifting and fixing device 3. The main platform 1 is installed on at least three leg columns 2 in a lifting and moving manner. The lifting and fixing device 3 is arranged on the main platform 1 and is in transmission cooperation with the leg columns 2 for driving the main platform 1 to lift and move and fixing the main platform 1. The leg column 2 includes a tubular shell 21 and a guide pipe 22. The guide pipe 22 is fixedly arranged in the tubular shell 21. The shape of the guide pipe 22 is J-shaped. One end of the guide pipe 22 is located at the upper part of the tubular shell 21, and the other end of the guide pipe 22 is communicated with a side wall hole 211 of the tubular shell 21.

[0044] An opening 23 is formed on one side of the tubular shell 21. A partition plate 231 and a side plate 232 are arranged inside the opening 23 to form a berthing area 230 outside the opening 23. An upper chamber 24 is further arranged inside the tubular shell 21. The upper chamber 24 is located above the opening 23. A berthing anti-collision column 233 and a ladder 234 are installed at the opening 23. The ladder 234 extends into the upper chamber 24. An access ladder 241 is installed in the upper chamber 24. An inner platform 242 is further arranged above the upper chamber 24. The access ladder 241 extends to the inner platform 242.

[0045] The jack-up platform adopts a design form of a main platform 1, at least three leg columns 2, and a lifting and fixing device 3. The main platform 1 is installed on at least three leg columns 2 in a lifting and moving manner. The lifting and fixing device 3 is arranged on the main platform 1 and is in transmission cooperation with the leg columns 2. When the main platform 1 needs to be lifted or lowered, the lifting and fixing device 3 generates a driving force on the leg columns 2 to make the main platform 1 lift and move relative to the leg columns 2. When the movement is in place, the leg columns 2 are locked by the lifting and fixing device 3 to fix the relative position between the leg columns 2 and the main platform 1, ensuring that the main platform 1 is stably maintained at the set height of the leg columns 2.

[0046] Since the leg column 2 includes a tubular shell 21 and a guide pipe 22 fixedly arranged in the tubular shell 21, and the shape of the guide pipe 22 is J-shaped. One end of the guide pipe 22 is located at the upper part of the tubular shell 21, and the other end of the guide pipe 22 is communicated with a side wall hole 211 of the tubular shell 21. A submarine cable channel is constructed inside the leg column 2 by using the guide pipe 22. The submarine cable enters the guide pipe 22 from the side wall hole 211. The submarine cable can reach a submarine cable anchoring device (not shown in the figure) at the upper part of the tubular shell 21 along the guide pipe 22 and then be stripped of its armor. The armored cable after stripping the armor enters the first deck of the booster station along the inner platform 242. An opening is reserved at the position of the leg column 2 corresponding to the first deck for the submarine cable to enter. This opening can be combined with a manhole 212.

[0047] Among them, an opening 23 is opened on one side of the tubular shell 21, and a partition 231 and a side plate 232 are arranged on the inner side of the opening 23. The inner side of the opening 23 is closed by the partition 231 and the side plate 232, and a berthing area 230 is formed outside the opening 23. The height position of the berthing area 230 at the pile leg 2 is set. The berthing area 230 is equivalent to or slightly higher than the sea level, ensuring that the operation and maintenance vessels can effectively abut the berthing anti-collision column 233 at the opening 23, and will not affect the berthing and landing due to the high platform working surface, thereby meeting the working requirements of the offshore booster station.

[0048] Moreover, when the maintenance vessel is against the berthing area 230, the vessel is prevented from rising and falling too much relative to the platform, and the maintenance personnel can safely enter the inner side of the opening 23. The berthing area 230 is integrated on the pile leg 2 to prevent the normal lifting function of the pile leg 2 from being affected by the protruding parts on the outside of the pile leg 2. In addition, the ladder 234 extends to the interior of the upper chamber 24, and a boarding ladder 241 is installed in the upper chamber 24. An inner platform 242 is also provided on the upper side of the upper chamber 24, and the boarding ladder 241 extends to the inner platform 242. The maintenance personnel enter the upper chamber 24 through the ladder 234, and then use the boarding ladder 241 to go up to the inner platform 242. The inner platform 242 is connected to the main platform 1, thereby achieving the purpose of personnel safely and smoothly boarding the first deck of the platform.

[0049] In this embodiment, at least three conduits 22 are provided, and at least three conduits 22 are centrally symmetrically distributed about the central axis of the tubular housing 21. The upper end of the conduit 22 is inserted and fixed on the inner platform 242, and a first reinforcing plate 224 is further provided between the lower end of the conduit 22 and the tubular housing 21. At least three conduits 22 form submarine cable channels in different directions, which facilitate multiple submarine cables to enter the pile leg 2 from different directions, and the first reinforcing plate 224 enhances the structural reliability between the conduit 22 and the tubular housing 21.

[0050] As a further preferred solution, the conduit 22 includes a vertical section 221 and a curved section 222 that are fixedly connected, the vertical section 221 extending and arranged parallel to the axial direction of the tubular housing 21, and a bell mouth 223 is provided at the lower end of the curved section 222, and the bell mouth 223 is connected to the side wall hole 211 of the tubular housing 21. The bell mouth 223 corresponds to the seabed mud surface, and the conduit 22 adopts a J-shaped design to ensure that the submarine cable can be inserted more smoothly.

[0051] Inside the tubular housing 21, a central sleeve 25 is provided. The central sleeve 25 penetrates through the upper chamber 24 and the berthing area 230 from top to bottom. At least three conduits 22 are fixedly installed inside the central sleeve 25. Moreover, there are two partition plates 231 and two side plates 232. The two partition plates 231 are respectively arranged at the upper and lower parts of the opening 23, and the two side plates 232 are respectively arranged on both sides of the opening 23. The two partition plates 231 and the two side plates 232 are fixedly connected between the central sleeve 25 and the tubular housing 21. The upper and lower partition plates 231 and the left and right side plates 232 construct a closed berthing area 230 at the opening 23, ensuring that the local structural strength of the leg 2 at the opening 23 is not weakened.

[0052] On the side of the side plate 232 facing away from the berthing area 230, a plurality of second reinforcing plates 235 are further provided. The second reinforcing plates 235 are fixedly connected between the central sleeve 25 and the tubular housing 21. The plurality of second reinforcing plates 235 are spaced apart along the axial direction of the tubular housing 21. Through the plurality of second reinforcing plates 235, the local strength at the opening 23 can be further improved, ensuring the overall height of the leg 2.

[0053] In this embodiment, the berthing anti-collision columns 233 are arranged at intervals outside the central sleeve 25. A plurality of struts are fixed between the berthing anti-collision columns 233 and the central sleeve 25. The ladder 234 extends parallel to the axial direction of the tubular housing 21 and is arranged inside the berthing anti-collision columns 233. There are two berthing anti-collision columns 233 arranged in parallel at intervals. The ladder 234 includes a first section of ladder 2341 and a second section of ladder 2342. The first section of ladder 2341 is arranged between the two berthing anti-collision columns 233, and the second section of ladder 2342 is arranged above the first section of ladder 2341 and extends into the upper chamber 24.

[0054] In addition, the access ladder 241 is arranged in a spiral shape around the outer peripheral wall of the central sleeve 25. The inner platform 242 is provided with an avoidance opening 243 corresponding to the access ladder 241. At the upper end of the tubular housing 21, a manhole 212 is further provided. The manhole 212 is arranged above the inner platform 242 and is higher than or flush with the upper surface of the main platform 1. Using the access ladder 241 for climbing is more convenient. The design of the avoidance opening 243 on the inner platform 242 can prevent bumping injuries. Personnel on the inner platform 242 can enter the first deck of the main platform 1 smoothly through the manhole 212.

[0055] The working process of the present invention is divided into two parts. First, at least three conduits 22 are fixedly arranged in the tubular housing 21, and the conduits 22 are in the shape of a J type. The conduits 22 construct a submarine cable channel inside the leg 2. The submarine cable can enter the conduit 22 from the bell mouth 223 at the lower end of the conduit 22. After the submarine cable reaches the submarine cable anchoring device (not shown in the figure) on the inner platform 242 and is armored stripped, the armored-stripped submarine cable passes through the manhole 212 and enters the first deck of the booster station, that is, the first deck of the main platform 1.

[0056] Second, an open mouth 23 is formed on one side of the tubular housing 21. A berthing area 230 is formed outside the open mouth 23 in combination with the partition plate 231 and the side plate 232. An upper chamber 24 is also provided inside the tubular housing 21, and the upper chamber 24 is located above the open mouth 23. The maintenance ship can effectively abut against the berthing anti-collision column 233 at the open mouth 23, and it will not be affected by the high platform working surface when berthing and landing; when the ship is berthed in place, the maintenance personnel can safely enter the inside of the open mouth 23, then climb up through the ladder 234 to enter the upper chamber 24, and then use the boarding step ladder 241 to reach the inner platform 242, and finally achieve the purpose of safely and smoothly boarding the first deck of the platform.

[0057] A leg with an internal conduit and a boarding structure according to an embodiment of the present invention is the same as the leg in the self-elevating platform in the above-mentioned embodiment of the invention, and will not be described in detail here.

[0058] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An elevating platform, characterized in that, It includes a main platform, at least three leg columns and a lifting and fixing device. The main platform is installed on at least three leg columns in a liftable and movable manner. The lifting and fixing device is arranged on the main platform and is in transmission cooperation with the leg columns to drive the main platform to lift and move and fix the main platform. The leg column includes a tubular shell and a conduit. The conduit is fixedly arranged in the tubular shell. The shape of the conduit is J-shaped. One end of the conduit is at the upper part of the tubular shell, and the other end of the conduit is communicated with the side wall hole of the tubular shell. An opening is arranged on one side of the tubular shell. A partition plate and a side plate are arranged inside the opening to form a berthing area outside the opening. An upper chamber is also arranged inside the tubular shell, and the upper chamber is located on the upper side of the opening. A berthing anti-collision column and a ladder are installed at the opening. The ladder extends into the upper chamber. A boarding ladder is installed in the upper chamber, and an inner platform is also arranged on the upper side of the upper chamber. The boarding ladder extends to the inner platform.

2. The jack-up platform according to claim 1, characterized in that, At least three conduits are arranged. At least three conduits are symmetrically distributed about the central axis of the tubular shell. The upper ends of the conduits are inserted and fixed on the inner platform, and a first reinforcing plate is also arranged between the lower ends of the conduits and the tubular shell.

3. The jack-up platform according to claim 2, characterized in that, The conduit includes a vertically arranged section and a bent section which are fixedly connected. The vertically arranged section extends parallel to the axis direction of the tubular shell. A flared opening is arranged at the lower end of the bent section, and the flared opening is communicated with the side wall hole of the tubular shell.

4. The jack-up platform according to claim 3, characterized in that, A central sleeve is arranged inside the tubular shell. The central sleeve penetrates through the upper chamber and the berthing area from top to bottom. At least three conduits are fixedly installed in the central sleeve.

5. The jack-up platform according to claim 4, characterized in that, Two partition plates and two side plates are arranged. The two partition plates are respectively arranged at the upper and lower parts of the opening. The two side plates are respectively arranged on both sides of the opening. The two partition plates and the two side plates are fixedly connected between the central sleeve and the tubular shell.

6. The jack-up platform according to claim 5, characterized in that, A plurality of second reinforcing plates are also arranged on the side of the side plate facing away from the berthing area. The second reinforcing plates are fixedly connected between the central sleeve and the tubular shell. The plurality of second reinforcing plates are spaced apart along the axis direction of the tubular shell.

7. The jack-up platform according to claim 4, characterized in that, The berthing anti-collision columns are arranged at intervals outside the central sleeve. A plurality of support rods are fixed between the berthing anti-collision columns and the central sleeve. The ladder extends parallel to the axial direction of the tubular shell, and the ladder is arranged inside the berthing anti-collision columns.

8. The jack-up platform according to claim 7, characterized in that, Two berthing anti-collision columns are arranged in parallel at intervals. The ladder includes a first section of ladder and a second section of ladder. The first section of ladder is arranged between the two berthing anti-collision columns. The second section of ladder is arranged above the first section of ladder, and the second section of ladder extends into the upper chamber.

9. The jack-up platform according to claim 4, characterized in that, The access ladder is arranged in a spiral shape around the outer peripheral wall of the central sleeve, and the inner platform is provided with an avoidance opening corresponding to the access ladder; a manhole is further provided at the upper end of the tubular housing, the manhole is arranged on the upper side of the inner platform, and the manhole is higher than or flush with the upper surface of the main platform.

10. A leg with an internal conduit and a boarding structure, characterized in that, The leg is the leg of the jack-up platform according to any one of claims 1 to 9.

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