A floating box and a floating box unit for a floating bridge

Abstract

The present invention discloses a floating box and a floating box unit for a floating bridge, relating to the technical field of floating foundation structures. It includes a floating box main body, which comprises at least one box body, and each box body is internally provided with a receiving cavity communicated with the water environment; a water inlet and drainage device, which is arranged in the receiving cavity and is used for forming a plurality of small cavities and adjusting the water levels in each small cavity according to the tide level so as to control the force balance of the floating box main body; and a plurality of tension legs, one end of each tension leg is connected to the floating box main body, and the other end is used for connecting to a seabed foundation. By means of the water inlet and drainage device arranged in the receiving cavity, a plurality of small cavities can be formed, and the water levels in each small cavity can be adjusted according to the tide level to control the force balance of the floating box main body. It can be adjusted in blocks and does not require the use of multiple pumping and drainage pumps, which can effectively reduce the noise during use and simplify the structure at the same time, solving the problems of serious noise during the use of multiple pumping and drainage pumps and complex structure of the floating box in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of floating infrastructure, and particularly relates to a floating box and a floating box unit for a floating bridge. Background Art

[0002] With the development of bridge technology, deep-water floating bridges have begun to show significant advantages in terms of construction cost, environmental protection, etc. In particular, long-span floating bridges based on tension leg platforms (Tension Leg Platform, which can be abbreviated as TLP) also have increasingly high application prospects.

[0003] However, in the application of tension leg platform foundations, roll and pitch motions are obvious. For long-span ocean floating bridges, due to the complex and changeable ocean environment, they will inevitably be subjected to various adverse environmental load effects, such as the combined effects caused by wind loads, wave loads, current loads, seismic loads, etc., which will cause different forms of responses or even instability of the tension leg floating platform foundation. At the same time, certain measures are also required to make the tension leg floating foundation applicable to various ocean engineering environments, so as to maintain the stability and normal use of the upper bridge structure. At the same time, as the number of ships on the waterway continues to increase and the ship types tend to be large-scale, the contradiction between the bridge and the passing ships has become increasingly prominent. Therefore, accidents of ships hitting bridge piers have also been increasing continuously. In the light case, it will cause damage to the ship and the bridge, affecting their service life. In the severe case, the ship will be destroyed and the bridge will collapse, causing heavy casualties and property losses. Long-span floating bridges also face similar problems.

[0004] In the prior art, the floating box is set as multiple blocks, and drainage pumps are arranged in each block. By draining the water in each block to adjust the force on the floating box, there are problems of serious noise when multiple drainage pumps are used and the complex structure of the floating box. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a floating box and a floating box unit for a floating bridge, which can solve the problems of serious noise when multiple drainage pumps are used and the complex structure of the floating box in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] On the one hand, a floating box for a floating bridge is provided, which includes:

[0008] A floating box main body, which includes at least one box body, and each said box body is provided with an accommodation cavity communicated with the water environment inside;

[0009] A water inlet and drainage device, which is arranged in the accommodation cavity, is used for forming a plurality of small cavities, and adjusting the water level in each said small cavity according to the tide level to control the force balance of the floating box main body;

[0010] Multiple tension legs, one end of each tension leg is connected to the floating box body, and the other end is used to be connected to the seabed foundation.

[0011] Based on the above technical solution,

[0012] In some optional solutions, the accommodation cavity is communicated with the water environment through the water inlet and outlet arranged on the side wall of the box body, and the water inlet and drainage device includes:

[0013] A rotating fan blade assembly, which is arranged in the accommodation cavity and is used to form multiple small cavities;

[0014] A rotating shaft arranged along the axial direction, which is connected to the rotating fan blade assembly and is used to drive the rotating fan blade assembly to rotate;

[0015] A driving motor, which is used to drive the rotating shaft to rotate, so as to drive the rotating fan blade assembly, and discharge the water in the small cavity to the outside through the water inlet and outlet, so as to adjust the water level in the small cavity.

[0016] In some optional solutions, each small cavity is provided with a ventilation valve, and the rotating fan blade assembly includes:

[0017] Multiple fan blades, which are circumferentially arranged at intervals on the rotating shaft, and the distance between adjacent fan blades is adjustable;

[0018] A control device, which controls the fan blades clamped on both sides of the water inlet and outlet to approach each other, and opens the ventilation valve corresponding to the small cavity outside the fan blade, so as to discharge the water in the small cavity inside the fan blade through the water inlet and outlet.

[0019] In some optional solutions, the rotating fan blade assembly further includes two closing devices, and the two closing devices are respectively located on the upper and lower sides of the fan blade, and the closing device includes:

[0020] A closing plate, which is arranged on the rotating shaft;

[0021] A driving mechanism, which drives the closing plate to move in the axial direction. When the fan blade rotates to the set position, the driving mechanism drives the closing plate to press on the upper side of the fan blade to form the small cavity.

[0022] In some optional solutions, an annular anti-collision device is sleeved outside the floating box body.

[0023] In some optional solutions, a wave-dissipating sleeve ring is installed on the anti-collision device, and wave-dissipating holes are arranged on the wave-dissipating sleeve ring.

[0024] In some optional solutions, the wave-dissipating sleeve ring is detachably connected to the anti-collision device.

[0025] In some alternative embodiments, the anti-collision device is connected to the outer side of the floating box body through a plurality of buffers.

[0026] In some alternative embodiments, the floating box body includes six said boxes, one of which is located in the middle of the floating box body, and the remaining boxes are arranged at intervals along the circumferential direction of the box at the center.

[0027] On the other hand, a floating box unit is provided, which includes three floating boxes of the above-mentioned type for a floating bridge.

[0028] Compared with the prior art, the advantages of the present invention are as follows:

[0029] When using the floating box for a floating bridge, at least one box is connected to form a floating box body. An accommodation cavity communicating with the water environment is provided inside each box. Through the water inlet and drainage device arranged in the accommodation cavity, a plurality of small cavities are formed to adjust the water level in each small cavity according to the tide level, so as to control the force balance of the floating box body. One end of multiple tension legs is connected to the floating box body, and the other end is connected to the seabed foundation. Through the water inlet and drainage device arranged in the accommodation cavity, a plurality of small cavities can be formed, and the water level in each small cavity can be adjusted according to the tide level to control the force balance of the floating box body. It can be adjusted in blocks and does not require the use of multiple pumping and drainage pumps, which can effectively reduce the noise during use and simplify the structure at the same time, solving the problems of serious noise during the use of multiple pumping and drainage pumps and the complex structure of the floating box in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of a floating box for a floating bridge according to the present invention;

[0032] Figure 2 It is a schematic structure diagram of an embodiment of a floating box for a floating bridge according to the present invention;

[0033] Figure 3 It is a schematic front view structure diagram of an embodiment of a floating box for a floating bridge according to the present invention at the design water level;

[0034] Figure 4 It is a schematic front view structure diagram of an embodiment of a floating box for a floating bridge according to the present invention;

[0035] Figure 5Schematic bottom view of an embodiment of a floating box for a floating bridge according to the present invention;

[0036] Figure 6 Schematic top view of an embodiment of a floating box for a floating bridge according to the present invention;

[0037] Figure 7 Schematic view of the structure of the box body in an embodiment of a floating box for a floating bridge according to the present invention;

[0038] Figure 8 Schematic view of the structure of the tension leg in an embodiment of a floating box for a floating bridge according to the present invention;

[0039] Figure 9 Schematic view of the structure of the anti-collision device in an embodiment of a floating box for a floating bridge according to the present invention;

[0040] Figure 10 Arrangement schematic of an embodiment of a floating box unit according to the present invention.

[0041] In the figure: 1. Floating box main body; 11. Box body; 111. Water inlet and outlet; 2. Water inlet and drainage device; 21. Rotating shaft; 22. Rotating fan blade assembly; 221. Fan blade; 222. Sealing device; 3. Tension leg; 31. Vertical tension leg; 32. Lateral tension leg; 4. Anti-collision device; 5. Wave-dissipating collar; 51. Wave-dissipating hole; 6. Buffer; 7. Passage. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0043] The following further describes in detail an embodiment of a floating box and a floating box unit for a floating bridge according to the present invention with reference to the accompanying drawings.

[0044] As Figures 1 - 8 shown, on the one hand, a floating box for a floating bridge is provided, which includes:

[0045] A floating box main body 1, which includes at least one box body 11, and each box body 11 is internally provided with a containing cavity communicating with the water environment;

[0046] A water inlet and drainage device 2, which is arranged in the containing cavity and is used to form a plurality of small cavities and adjust the water levels in each small cavity according to the tide level to control the force balance of the floating box main body 1;

[0047] Multiple tension legs 3, one end of each tension leg 3 is connected to the floating box body 1, and the other end is used to connect to the seabed foundation.

[0048] When using the floating box for the floating bridge, at least one box body 11 is connected to form the floating box body 1. An accommodation cavity communicating with the water environment is provided inside each box body 11. Through the water inlet and outlet device 2 arranged in the accommodation cavity, multiple small cavities are formed to adjust the water level in each small cavity according to the tide level, so as to control the force balance of the floating box body 1. One end of multiple tension legs 3 is connected to the floating box body 1, and the other end is connected to the seabed foundation. Through the water inlet and outlet device 2 arranged in the accommodation cavity, multiple small cavities can be formed, and the water level in each small cavity can be adjusted according to the tide level to control the force balance of the floating box body 1. It can be adjusted in blocks and does not require the use of multiple pumping and drainage pumps, which can effectively reduce the noise during use, simplify the structure at the same time, and solve the problems of serious noise during the use of multiple pumping and drainage pumps and the complex structure of the floating box in the prior art.

[0049] In this example, the tide level is observed by the monitoring device, and the use of the water inlet and outlet device 2 is controlled by a computer program, saving labor costs. The tension leg 3 is a soft-connected steel strand, which is divided into a vertical tension leg 31 and a lateral tension leg 32 according to the position. Both forms of tension legs can provide different-direction structural stiffness for the long-span floating bridge and complement each other to a certain extent.

[0050] According to Archimedes' buoyancy formula: F buoy = G row = ρ liquid * g * V row, changing the drainage volume can achieve the control of the buoyancy of the floating box.

[0051] As Figure 1 shown, in some optional embodiments, the accommodation cavity communicates with the water environment through the water inlet and outlet 111 provided on the side wall of the box body 11. The water inlet and outlet device 2 includes:

[0052] A rotating fan blade assembly 22, which is arranged in the accommodation cavity and is used to form multiple small cavities;

[0053] A rotating shaft 21 arranged along the axial direction, which is connected to the rotating fan blade assembly 22 and is used to drive the rotating fan blade assembly 22 to rotate;

[0054] A driving motor, which is used to drive the rotating shaft 21 to rotate, so as to drive the rotating fan blade assembly 22 to discharge the water in the small cavity through the water inlet and outlet 111 to adjust the water level in the small cavity.

[0055] In this embodiment, a water inlet and outlet 111 is provided on the side wall of the box body 11. The accommodation cavity is communicated with the water environment through the water inlet and outlet 111. The water inlet and drainage device 2 includes a rotating fan blade assembly 22, a rotating shaft 21 and a driving motor. The rotating fan blade assembly 22 corresponds to the box body 11 one by one and is arranged in the accommodation cavity. Multiple small cavities are formed in cooperation with the inner wall of the box body 11. The rotating shaft 21 is arranged along the axial direction and is connected to the rotating fan blade assembly 22. The driving motor drives the rotating shaft 21 to rotate to drive the rotating fan blade assembly 22. The centrifugal force generated by the rotating fan blade assembly 22 on the water causes the water in the small cavity to be discharged outward from the water inlet and outlet 111, so as to adjust the water level in the small cavity. The adjustment method is simple and there is no need to set a pumping and drainage pump.

[0056] In this example, the water inlet and outlet 111 is a two-way valve.

[0057] As Figure 1 shown, in some optional embodiments, each small cavity is provided with a ventilation valve. The rotating fan blade assembly 22 includes:

[0058] Multiple fan blades 221, which are circumferentially arranged at intervals on the rotating shaft 21, and the distance between adjacent fan blades 221 is adjustable;

[0059] A control device, which controls the fan blades 221 clamped on both sides of the water inlet and outlet 111 to approach each other, and opens the ventilation valve corresponding to the small cavity outside the fan blade 221, so as to discharge the water in the small cavity inside the fan blade 221 through the water inlet and outlet 111.

[0060] In this embodiment, the specific structure of the rotating fan blade assembly 22 is described. The rotating fan blade assembly 22 includes multiple fan blades 221 and a control device. The multiple fan blades 221 are circumferentially arranged at intervals on the rotating shaft 21, and the distance between adjacent fan blades 221 is adjustable. The control device controls the fan blades 221 clamped on both sides of the water inlet and outlet 111 to approach each other, and opens the ventilation valve corresponding to the small cavity outside the fan blade 221. By the mutual approach of the fan blades 221 on both sides, pressure is applied to the small cavity inside the fan blade 221, so as to discharge the water in the small cavity inside the fan blade 221 through the water inlet and outlet 111. Opening the ventilation valve corresponding to the small cavity outside the fan blade 221 can prevent damage to the structure caused by pressure changes in adjacent small cavities, so as to realize the individual adjustment of the water level in each small cavity.

[0061] In this example, considering the problem of sealing, a water isolation layer made of flexible material is provided on the rotating shaft 21, and the fan blades 221 are connected by flexible material. A flexible water isolation layer is also provided at the connection between the fan blade 221 and the upper side of the accommodation cavity, so as to ensure the sealing of each small cavity when the fan blades 221 on both sides approach each other.

[0062] As Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 andFigure 9 As shown, in some alternative embodiments, the rotating blade assembly 22 further includes two closing devices 222, which are respectively located on the upper and lower sides of the blade 221. The closing device 222 includes:

[0063] A closing plate, which is arranged on the rotating shaft 21;

[0064] A driving mechanism, which drives the closing plate to move in the axial direction. When the blade 221 rotates to a set position, the driving mechanism drives the closing plate to press against the upper side of the blade 221 to form a small cavity.

[0065] In this embodiment, the rotating blade assembly 22 further includes a closing device 222, which is located on the upper and lower sides of the blade 221. The rotating blade assembly 22 includes a closing plate and a driving mechanism. The closing plate is arranged on the rotating shaft 21, and the driving mechanism drives the closing plate to move in the height direction. When water inlet is required, the blade 221 rotates to the set position, and the driving mechanism drives the closing plate to press against the upper side of the blade 221 to form a small cavity. When the water needs to be discharged as a whole, the driving mechanism drives the closing plate away from the blade 221, and the rotating blade assembly 22 accelerates to rotate, and the water in the accommodating cavity is discharged by centrifugal force, which facilitates the rotation of the rotating blade assembly 22 and reduces the friction received by the blade 221.

[0066] As Figures 1 - 6 shown, in some alternative embodiments, an annular anti-collision device 4 is sleeved outside the floating box body 1.

[0067] In this embodiment, an annular anti-collision device 4 is sleeved outside the floating box body 1, which can increase the buoyancy of the whole structure for balance control adjustment in water, and at the same time can also increase the anti-overturning force arm of the whole structure. Since the torque is equal to the product of the force arm and the force, when the required torque remains unchanged, the larger the force arm, the smaller the required force. Therefore, by increasing the anti-overturning force arm, the pre-tension of the tension leg 3 and the requirement of the floating box body 1 for the remaining buoyancy can be reduced, and the number of tension legs 3 used, the quality requirement and the manufacturing difficulty are reduced. The anti-collision device 4 can also be used as the floating stability system of the whole structure. The relatively large area in the horizontal direction can play a role similar to that of a heaving plate, thereby reducing the heaving phenomenon of the floating box body 1 and the upper bridge structure, and at the same time enhancing the stability and anti-overturning ability of the whole structure and increasing the performance of resisting wind and wave loads.

[0068] In this example, the anti-collision device 4 is an annular hollow box body, and titanium alloy plate materials with a thickness of 20 - 30 cm can be used for welding production to enhance the anti-buckling ability of the floating box body 1 and the anti-impact performance of the anti-collision device 4, and ensure the sealing performance between the floating box body 1 and the anti-collision device 4. On the other hand, the cross-sectional area of the floating box body 1 can also be increased through the anti-collision device 4 to improve the buoyancy of the floating box.

[0069] As Figure 1 and Figure 9 shown, in some alternative embodiments, a wave-dissipating collar 5 is installed on the anti-collision device 4, and wave-dissipating holes 51 are provided on the wave-dissipating collar 5.

[0070] In this embodiment, a wave-dissipating collar 5 is installed on the anti-collision device 4, and wave-dissipating holes 51 are provided on the wave-dissipating collar 5, which is beneficial to giving full play to the role of the wave-dissipating collar 5 and further reducing the wave load. When the incident wave acts on the structure, the complex climbing path causes the wave to break, thereby dissipating energy.

[0071] As Figure 9 shown, in some alternative embodiments, the wave-dissipating collar 5 is detachably connected to the anti-collision device 4.

[0072] In this embodiment, the wave-dissipating collar 5 is fixedly embedded on the outside of the anti-collision device 4 by an inlay method and can be disassembled and replaced, which is convenient for the maintenance of the structure and factory prefabrication to a certain extent. The outer surface of the anti-collision device 4 is an arc surface, and the inner surface is a vertical surface. The design of the outer arc surface helps to hinder the wave climbing to a certain extent, reduce the load of the wave on the upper foundation, and at the same time make the wave easier to enter the wave-dissipating holes 51 for dissipation.

[0073] As Figure 1 、 Figure 2 and Figure 6 shown, in some alternative embodiments, the anti-collision device 4 is connected to the outside of the floating box main body 1 by a plurality of buffers 6.

[0074] In this embodiment, when the anti-collision device 4 is subjected to wave force, or the floating box main body 1 is displaced in the horizontal or vertical direction due to the influence of the bridge load, the buffer 6 can provide a buffering effect to maintain the structural stability of the floating box main body 1 and the upper bridge, improve the anti-overturning performance of the floating box main body 1, and reduce the pitching and rolling of the bridge.

[0075] As Figure 1 and Figure 7 shown, in some alternative embodiments, the floating box main body 1 includes six boxes 11, one of which is located in the middle of the floating box main body 1, and the remaining boxes 11 are arranged at intervals circumferentially around the box 11 at the center.

[0076] In this embodiment, the floating box main body 1 includes six boxes 11, one of which is located in the middle of the floating box main body 1, and the remaining boxes 11 are arranged at intervals circumferentially around the box 11 at the center, which can increase the buoyancy of the floating box main body 1 while improving the stability of the floating box main body 1.

[0077] As Figures 1 - 6 [[ID=4

[0078] When using this floating box unit, at least one box body 11 is connected to form a floating box main body 1. An accommodation cavity communicating with the water environment is provided inside each box body 11. Through the water inlet and drainage device 2 arranged in the accommodation cavity, a plurality of small cavities are formed to adjust the water levels in each small cavity according to the tide level, so as to control the force balance of the floating box main body 1. One end of multiple tension legs 3 is connected to the floating box main body 1, and the other end is connected to the seabed foundation. Through the water inlet and drainage device 2 arranged in the accommodation cavity, a plurality of small cavities can be formed, and the water levels in each small cavity can be adjusted according to the tide level to control the force balance of the floating box main body 1. It can be adjusted in blocks and does not require the use of multiple pumping and drainage pumps, which can effectively reduce the noise during use and simplify the structure at the same time, solving the problems of serious noise when multiple pumping and drainage pumps are used and the complex structure of the floating box in the prior art.

[0079] In this example, three floating boxes for the floating bridge are arranged in a triangle to enhance the structural stability. A passage 7 for construction workers to walk is provided between adjacent floating boxes for the floating bridge and is located above the water surface, which is used to meet the emergency needs when accidents such as ship collisions and structural failures occur nearby, and can also be used by maintenance personnel for the inspection and detection of the structure. A guardrail is provided outside the passage 7 to prevent people from falling. One lateral tension leg 32 of each floating box for the floating bridge shares an anchoring point at the center of the triangle to enhance the structural stiffness and improve the environmental protection and economic performance of the structure.

[0080] As Figure 10 shown, multiple floating box units are arranged according to the span of the long-span floating bridge they carry. At the same time, the top view directions of each floating box unit are arranged in a reasonable curve with the minimum bending moment formed at each position of the long-span floating bridge according to the maximum wave force in the area where they are located, further reducing the influence of the external force on the bending moment formed on the structure.

[0081] To sum up, when using this floating box for the floating bridge, at least one box body 11 is connected to form a floating box main body 1. An accommodation cavity communicating with the water environment is provided inside each box body 11. Through the water inlet and drainage device 2 arranged in the accommodation cavity, a plurality of small cavities are formed to adjust the water levels in each small cavity according to the tide level, so as to control the force balance of the floating box main body 1. One end of multiple tension legs 3 is connected to the floating box main body 1, and the other end is connected to the seabed foundation. Through the water inlet and drainage device 2 arranged in the accommodation cavity, a plurality of small cavities can be formed, and the water levels in each small cavity can be adjusted according to the tide level to control the force balance of the floating box main body 1. It can be adjusted in blocks and does not require the use of multiple pumping and drainage pumps, which can effectively reduce the noise during use and simplify the structure at the same time, solving the problems of serious noise when multiple pumping and drainage pumps are used and the complex structure of the floating box in the prior art.

[0082] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0083] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0084] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A pontoon for a floating bridge, characterized in that: include: A buoyancy tank body (1) comprising at least one box body (11), each box body (11) being provided with a receiving cavity in communication with a water environment; An inlet and outlet device (2) is provided in the accommodating cavity and is used to form a plurality of small cavities and to adjust the water level in each of the small cavities according to the tide level so as to control the force balance of the buoyancy tank body (1); A plurality of tension legs (3), each of the tension legs (3) having one end connected to the buoyancy box body (1) and the other end used for connecting to a seabed foundation; The accommodating cavity is in communication with the water environment via a water inlet and outlet (111) provided on the side wall of the box body (11), and the water inlet and outlet device (2) comprises: A rotating fan blade assembly (22), which is arranged in the accommodating cavity and is used to form a plurality of the small cavities; A rotating shaft (21) arranged in an axial direction, connected to the rotating blade assembly (22), and used to drive the rotating blade assembly (22) to rotate; a driving motor for driving the rotating shaft (21) to rotate, thereby driving the rotating fan blade assembly (22) to discharge the water in the small cavity outwardly through the water inlet and outlet (111) to adjust the water level in the small cavity; Each of the small cavities is provided with a vent valve, and the rotating fan blade assembly (22) comprises: a plurality of fan blades (221) arranged on the rotating shaft (21) at circumferential intervals, wherein the distance between adjacent fan blades (221) is adjustable; A control device controls the fan blades (221) disposed on both sides of the water inlet and outlet (111) to move closer to each other, and opens the vent valve corresponding to the small cavity outside the fan blade (221) to discharge water in the small cavity inside the fan blade (221) through the water inlet and outlet (111).

2. A pontoon for a floating bridge according to claim 1, characterized in that: The rotating fan blade assembly (22) further comprises two closing devices (222), the two closing devices (222) being located on the upper and lower sides of the fan blade (221), respectively, and the closing devices (222) comprising: a closing plate disposed on the rotating shaft (21); A driving mechanism drives the closing plate to move in an axial direction, and when the fan blade (221) rotates to a set position, the driving mechanism drives the closing plate to press against the upper side of the fan blade (221) to form the small cavity.

3. A pontoon for a floating bridge according to claim 1, characterized in that: An annular anti-collision device (4) is sleeved on the outer side of the buoyancy tank body (1).

4. A pontoon for a floating bridge according to claim 3, characterized in that: A wave-absorbing collar (5) is installed on the anti-collision device (4), and a wave-absorbing hole (51) is provided on the wave-absorbing collar (5).

5. A pontoon for a floating bridge according to claim 4, characterized in that: The wave-absorbing collar (5) is detachably connected to the anti-collision device (4).

6. A pontoon for a floating bridge according to claim 3, characterized in that: The anti-collision device (4) is connected to the outer side of the buoyancy tank body (1) via a plurality of buffers (6).

7. A pontoon for a floating bridge according to claim 1, characterized in that: The buoyancy tank body (1) comprises six boxes (11), one of which is located in the middle of the buoyancy tank body (1), and the remaining boxes (11) are arranged at intervals along the circumference of the box (11) at the center.

8. A pontoon unit, characterized in that: The floating bridge comprises three pontoons according to any one of claims 1 to 7.

Images