Anti-scouring marine jacket suction foundation and mounting method thereof

Abstract

The invention discloses an anti-scouring marine jacket suction foundation and a mounting method thereof. According to the suction foundation, the energy conversion device driven by water flow is arranged in the main pipeline, water flow kinetic energy is converted into mechanical energy of the stirring rods, soil in the foundation is disturbed and broken, and the rotating speed of all the stirring rods is accurately controlled in combination with the recognition system, the acceleration system and the deceleration system; therefore, the suction foundation can stably sink below the mud surface of the seabed, and the anti-scouring capability and the construction reliability are effectively improved. The device is simple in structure, flexible to control and suitable for ocean jacket foundation engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore engineering foundation, and particularly relates to an anti-scouring offshore jacket suction foundation and a mounting method thereof. BACKGROUND

[0002] The present application relates to the technical field of offshore engineering foundation, and particularly relates to an anti-scouring offshore jacket suction foundation and a mounting method thereof.

[0003] With the development of offshore wind power towards deep water and large capacity, the jacket foundation gradually replaces the single pile foundation to become the mainstream form. The suction foundation is widely used in the offshore jacket due to the advantages of no need for piling, low construction noise, recyclability and the like.

[0004] However, the existing suction foundation still has the following problems in actual engineering: 1. prone to scour around the foundation under the action of wave flow, resulting in reduced bearing capacity; 2. prone to soil plug formation during the negative pressure sinking process, and it is difficult to reach the designed depth; 3. insufficient sinking stability of the foundation under the condition of soft soil on the seabed surface.

[0005] Sinking the suction foundation below the seabed mud surface is an effective measure to solve the above problems, but the existing schemes generally have problems such as difficulty in sealing, system interference, complex construction or high cost, and there is an urgent need for a new type of suction foundation scheme with reliable structure, precise control and economic feasibility. SUMMARY

[0006] The present application relates to the technical field of offshore engineering foundation, and particularly relates to an anti-scouring offshore jacket suction foundation and a mounting method thereof.

[0007] The technical scheme adopted by the present application is as follows:

[0008] By setting an energy conversion device driven by water flow inside the suction foundation, the water flow kinetic energy is used to drive the stirring rod and stirring blade to disturb the soil; and by using the identification system, acceleration system and deceleration system, the independent and precise control of the rotating speed of each stirring rod is realized, so as to ensure that the suction foundation is uniformly and stably sunk to below the seabed mud surface.

[0009] As a preferred embodiment of the present application, the suction foundation comprises a top cover and a side wall; a main pipeline is arranged below the top cover, and the main pipeline has a water inlet and a water outlet; at least one energy conversion device is arranged in the main pipeline; a stirring rod and a stirring blade are connected with the energy conversion device; the energy conversion device is used to convert the water flow kinetic energy flowing through the main pipeline into mechanical energy, so as to drive the stirring rod and the stirring blade to rotate, thereby disturbing and breaking the soil inside the suction foundation, and enabling the suction foundation to be sunk to below the seabed mud surface under the action of negative pressure.

[0010] As a preferred embodiment of the present application, the stirring rod does not penetrate the top cover, and the driving of the stirring rod is completely realized by the water flow in the main pipeline and the energy conversion device.

[0011] As a preferred embodiment of the present application, the suction foundation further comprises a self-weight sinking pneumatic valve and a suction sinking pneumatic valve arranged on the top cover, for discharging the mud-water mixture in different sinking stages.

[0012] As a preferred embodiment of the present application, the suction foundation further comprises an identification system comprising a main pipeline water pressure sensor and a shunt pipeline water pressure sensor, for obtaining the water flow pressure and calculating the corresponding stirring rod rotating speed.

[0013] As a preferred embodiment of the present application, the suction foundation further comprises a stirring rod speed reduction system comprising a shunt pipeline in communication with the main pipeline and an on-off device arranged in the shunt pipeline, and the reduction of the corresponding stirring rod rotating speed is realized by adjusting the shunt flow.

[0014] As a preferred embodiment of the present application, the suction foundation further comprises a stirring rod speed increasing system comprising a speed increasing system inlet pipeline and a speed increasing system outlet pipeline, and the stirring rod rotating speed is increased by providing additional water flow to the corresponding energy conversion device.

[0015] The present application also provides a method for installing an anti-scouring offshore jacket suction foundation, for installing the anti-scouring offshore jacket suction foundation as described above, in combination with Figures 4-12 As shown, the installation method comprises the following steps:

[0016] S1, normal installation process of the suction foundation.

[0017] Step S1-1, mud contact and self-weight sinking stage. The suction foundation is hoisted into position, and the bottom contacts the seabed. The self-weight sinking is started, so that the suction foundation sinks into the soil by gravity, and the mud-water mixture in the self-weight sinking stage is discharged from the suction foundation.

[0018] Step S1-2, suction sinking stage. The self-weight sinking stops, and the suction sinking starts. The water pump is turned on to make the suction foundation sink, until the stirring blades contact the soil inside the suction foundation.

[0019] Step S1-3, suction stirring sinking stage. The water pump is used to pump water in the pipeline, and the water flow drives the stirring blades to rotate and cut the soil through the energy conversion device. In this process, the soil is cut while the suction foundation is sinking by negative pressure, until the suction foundation sinks to the designated position below the mud surface.

[0020] Step S1-4, after the completion of the sinking, close the suction foundation top cover on the mouth can be water exchange, complete the above operation will be removed and recycled water pump.

[0021] S2, the use of the identification system in the installation process;

[0022] S2-1, the main pipe stirring rod speed identification method, the main pipe is driven by the water pump to have a certain flow rate in the pipe, at this time the main pipe water flow has a certain flow rate V1, the main pipe water pressure sensor generates pressure data P1, the pressure P1 and the main pipe water flow rate V1 have a corresponding relationship, through the corresponding relationship, the main pipe water flow rate V1 can be obtained according to P1. Again, A is the cross-sectional area of the main pipe, the main pipe flow is Q1, and Q1 is obtained according to A*V1. The flow Q of the energy conversion device is Q, and Q is obtained according to Q1=A*V1. The stirring rod speed is V, and the flow Q of the energy conversion device and the stirring rod speed V have a corresponding relationship, and V can be obtained according to Q through the corresponding relationship. Therefore, the stirring rod speed V can be obtained according to the pressure data P1 generated by the main pipe water pressure sensor through the above calculation.

[0023] S2-2, the shunt pipe water flow identification method, open the on-off device, the shunt pipe will produce water flow rate V2, at this time the shunt pipe water pressure sensor generates pressure data P2, the pressure P2 and the shunt pipe water flow rate V2 have a corresponding relationship, through the corresponding relationship, the shunt pipe water flow rate V2 can be obtained according to P2. The shunt pipe flow is Q2, and Q2 is obtained according to Q2=A*V2. A is the cross-sectional area of the on-off device, which is known and can be adjusted in size. Therefore, the shunt pipe flow Q2 can be obtained according to the pressure data P2 generated by the shunt pipe water pressure sensor, and P2 and Q2 are positively correlated. According to the size of the flow in the shunt pipe, the degree of deceleration of the shunt pipe to the water flow in the main pipe can be judged. When the shunt pipe has a large degree of shunt, P2 is large at this time, and Q2 is large according to the above analysis, at this time the shunt pipe has a large flow, which leads to a small flow Q1 in the main pipe, which leads to a small flow of the energy conversion device in the main pipe, so the stirring rod speed is small at this time. When the shunt pipe has a small degree of shunt, P2 is small at this time, and Q2 is small according to the above analysis, at this time the shunt pipe has a small flow, which leads to a large flow Q1 in the main pipe, which leads to a large flow of the energy conversion device in the main pipe, so the stirring rod speed is large at this time.

[0024] S2-3, the identification system troubleshooting method, the suction foundation suction stirring sinking stage, when one or more energy conversion devices in the main pipeline stop rotating due to the greater resistance of the lower stirring rod, stop pumping at this time, open all the shutoff devices in the shunt pipe to have a certain flow rate in the shunt pipe, and then close the shutoff devices of each shunt pipe in turn. First, if the water flow rate in the main pipeline does not change much after closing a shutoff device, it proves that the stirring blade below the energy conversion device has less resistance and runs normally without the need for acceleration. If the water flow rate in the main pipeline decreases significantly or even stops after closing a shutoff device, it can be judged that the stirring rod below the energy conversion device corresponding to the shunt pipe has greater resistance and needs to be accelerated. Then, according to this method, the shutoff devices are closed in turn for troubleshooting. After troubleshooting, all stirring rods that need to be accelerated are accelerated in turn using the stirring rod acceleration system. After acceleration, continue to pump and sink.

[0025] S3, the use method of the stirring rod deceleration system during installation

[0026] During the suction foundation suction stirring sinking stage, if the suction foundation tilts during sinking, the rotational speed of the energy conversion device on the low side of the suction foundation needs to be reduced to make the suction foundation sink uniformly. Open the shutoff device to reduce the flow through the corresponding energy conversion device to achieve deceleration of the energy conversion device. The opening degree of the shutoff device is based on the real-time change of the rotational speed of the energy conversion device obtained by the identification system.

[0027] S4, the use method of the stirring rod acceleration system to increase the rotational speed of the energy conversion device during installation

[0028] Based on the original flow rate, use a water pump to pump and drain water through the corresponding pumping and draining pipes on both sides of the energy conversion device that needs to be accelerated. At this time, the flow through the energy conversion device includes the initial flow generated by the water pump pumping and the additional flow generated by the water pump pumping. The flow through the flow conversion device increases, which can increase the rotational speed of the stirring rod below the corresponding energy conversion device.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] (1) Avoids the problem of sealing failure of the suction foundation. By connecting the water pump to the water inlet and outlet, the kinetic energy of the water flow is converted into mechanical energy of the stirring rod, which in turn drives the stirring blade to disturb the soil, and there is no problem of penetrating the top cover of the foundation, so there is no problem of sealing failure;

[0031] (2) By separately arranging the pipelines, differential stirring control can be realized for non-homogeneous soil. The setting of the stirring rod acceleration system and the stirring rod deceleration system can realize precise control of the acceleration and deceleration of each stirring blade, effectively cope with the spatial inhomogeneity problem of the seabed soil, and realize uniform sinking;

[0032] (3) The negative pressure sinking system and the soil breaking system can operate independently without interfering with each other;

[0033] (4) Good economic efficiency. After construction, there is a switch at the connection between the water pipe and the suction tank to recycle the external water pipe and water pump. The energy conversion device has a low cost. Although it is left inside the foundation after the foundation is installed, there is no problem of high overall cost. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain this application and do not constitute an undue limitation of the invention. In the drawings:

[0035] Figure 1 Overall front view of the invention

[0036] Figure 2 Overall top view of the invention

[0037] Figure 3 Detailed structural diagram of the invention

[0038] Figure 4 Schematic diagram of suction foundation installation process

[0039] Figure 5 Schematic diagram of the anti-erosion principle of this invention

[0040] Figure 6 : Diagram of the identification system usage process

[0041] Figure 7 Schematic diagram of the stirring rod deceleration system

[0042] Figure 8 Schematic diagram of the first energy conversion device accelerating.

[0043] Figure 9 Schematic diagram of the second energy conversion device accelerating the process.

[0044] Figure 10 Schematic diagram of the third energy conversion device accelerating the process.

[0045] Figure 11 Schematic diagram of the fourth energy conversion device.

[0046] Figure 12 Schematic diagram of the fifth energy conversion device.

[0047] in,

[0048] 1-Suction foundation; 11-Top cover; 12-Side wall; 13-Self-weight sinking pneumatic valve; 14-Suction sinking pneumatic valve; 15-Geotextile bag;

[0049] 2-main pipe; 21-main pipe water inlet; 22-main pipe water outlet; 23-energy conversion device; 231-first energy conversion device; 232-second energy conversion device; 233-third energy conversion device; 234-fourth energy conversion device; 235-fifth energy conversion device; 24-stirring rod; 25-stirring blade;

[0050] 3-recognition system; 31-main pipe water pressure sensor; 32-shunt pipe water pressure sensor;

[0051] 4-stirring rod deceleration system; 41-shunt pipe; 42-opening and closing device;

[0052] 5-stirring rod acceleration system; 51-stirring rod acceleration system water inlet; 52-stirring rod acceleration system water outlet; 53-stirring rod acceleration system water inlet pipe; 54-stirring rod acceleration system water outlet pipe; 541-first stirring rod acceleration system water outlet pipe; 542-second stirring rod acceleration system water outlet pipe; 543-third stirring rod acceleration system water outlet pipe; 544-fourth stirring rod acceleration system water outlet pipe; 545-fifth stirring rod acceleration system water outlet pipe. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0054] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0055] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of the present specification, the description referring to the terms "one embodiment", "an example", or "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0058] The present application provides an anti-scouring offshore jacket suction foundation Figures 1-3 , comprising 1 - suction foundation, 2 - main pipeline, 3 - identification system, 4 - mixing rod deceleration system, 5 - mixing rod acceleration system.

[0059] 1 - suction foundation comprises 11 top cover, 12 side wall, 13 self-weight sinking pneumatic valve, 14 suction sinking pneumatic valve, 15 - geotextile bag. 11 top cover is located at the top of the suction foundation, 12 side wall is located at the side of the suction foundation, 13 automatic sinking pneumatic valve and 14 suction sinking pneumatic valve are respectively located on both sides of the 11 top cover. 13 automatic sinking pneumatic valve and 14 suction sinking pneumatic valve respectively discharge mud-water mixture in the self-weight sinking stage and the suction sinking stage to make 1 suction foundation sink, and water pipes are attached above the 13 automatic sinking pneumatic valve and the 14 suction sinking pneumatic valve. 15 geotextile bag is arranged at the edge above the 11 top cover, the geotextile bag is water-permeable and sand-impermeable, and is used for containing soil sucked out by negative pressure in the mixing process to avoid pollution of the soil sucked out by negative pressure to the marine environment.

[0060] 2—Main pipe includes 21 main pipe water inlet, 22 main pipe water outlet, 23 energy conversion device, 231 first energy conversion device, 232 second energy conversion device, 233 third energy conversion device, 234 fourth energy conversion device, 235 fifth energy conversion device, 24 stirring rod, 25 stirring blade. 2 main pipe is welded below 11 top cover, which has the effect of strengthening 11 top cover. 21 main pipe water inlet and 22 main pipe water outlet are located on 11 top cover, which are used for water inlet and outlet of 2 main pipe. Water pipes are attached above 21 main pipe water inlet and 22 main pipe water outlet. 23 energy conversion devices are arranged in 2 main pipe. 24 stirring rod is connected below 23 energy conversion device. 25 stirring blade is connected below 24 stirring rod. 23 energy conversion device can convert water flow energy generated by water pump into mechanical energy inside 23 energy conversion device, which can drive 24 stirring rod and 25 stirring blade to rotate and stir soil. The inside of 23 energy conversion device is communicated with water flow of main pipe. When 23 energy conversion device stops working, the pressure of water inside 23 energy conversion device is the sum of atmospheric pressure and the pressure of water at that depth.

[0061] 3—Identification system includes 31 main pipe water pressure sensor, 32 shunt pipe water pressure sensor. 31 main pipe water pressure sensor is arranged in 2 main pipe near the water outlet side of 23 energy conversion device. 32 shunt pipe water pressure sensor is arranged in 41 shunt pipe near the water outlet side of 42 opening and closing device. 31 main pipe water pressure sensor and 32 shunt pipe water pressure sensor are used to monitor the pressure in 2 main pipe and 41 shunt pipe respectively.

[0062] 4—Stirring rod speed reduction system includes 41 shunt pipe and 42 opening and closing device. 41 shunt pipe is welded on 2 main pipe. 42 opening and closing device is arranged inside 41 shunt pipe. 42 opening and closing device can control the size of cross-sectional area of water flow in shunt pipe. The size of cross-sectional area of 41 shunt pipe is equal to that of main pipe. The size of cross-sectional area of 42 opening and closing device can be controlled by remote control to control the size of cross-sectional area of water flow.

[0063] 5 - The stirring rod acceleration system comprises a 51 stirring rod acceleration system water inlet, a 52 stirring rod acceleration system water outlet, a 53 stirring rod acceleration system water inlet pipe, a 531 first stirring rod acceleration system water inlet pipe, a 532 second stirring rod acceleration system water inlet pipe, a 533 third stirring rod acceleration system water inlet pipe, a 534 fourth stirring rod acceleration system water inlet pipe, a 535 fifth stirring rod acceleration system water inlet pipe, a 54 stirring rod acceleration system water outlet pipe, a 541 first stirring rod acceleration system water outlet pipe, a 542 second stirring rod acceleration system water outlet pipe, a 543 third stirring rod acceleration system water outlet pipe, a 544 fourth stirring rod acceleration system water outlet pipe, and a 545 fifth stirring rod acceleration system water outlet pipe. The 51 stirring rod acceleration system water inlet and the 52 stirring rod acceleration system water outlet are arranged on the 11 top cover. The 53 stirring rod acceleration system water inlet pipe is provided with a plurality of pipes, the number of which is one less than the number of the 23 energy conversion devices; the plurality of 53 stirring rod acceleration system water inlet pipes are welded on the 11 top cover, one end of the plurality of 53 stirring rod acceleration system water inlet pipes is connected to the 51 stirring rod acceleration system water inlet, and the other end is welded on the 2 main pipelines on the water outlet side of the 23 energy conversion devices. The 54 stirring rod acceleration system water outlet pipe is provided with a plurality of pipes, the number of which is equal to the number of the 23 energy conversion devices; the plurality of 54 stirring rod acceleration system water outlet pipes are welded on the 11 top cover, one end of the plurality of 54 stirring rod acceleration system water outlet pipes is connected to the 52 stirring rod acceleration system water outlet, and the other end is welded on the 2 main pipelines on the water inlet side of the 23 energy conversion devices.

[0064] The application also provides a method for installing an anti-scouring offshore jacket suction foundation, which is used for installing the anti-scouring offshore jacket suction foundation. Figures 4-12 As shown in the drawings, the installation method comprises the following steps:

[0065] S1, normal suction foundation installation process Figures 4-5 ).

[0066] Specifically, the normal suction foundation installation process S1 specifically comprises the following steps:

[0067] Step S1-1, mud contact and self-weight sinking stage. The suction foundation is hoisted into position, and the bottom contacts the seabed. The 13 self-weight sinking pneumatic valve is opened, and the 14 suction sinking pneumatic valve is closed, so that the suction foundation sinks into the soil by gravity, and the mud-water mixture in the self-weight sinking stage is discharged from the 13 self-weight sinking pneumatic valve.

[0068] Step S1-2, suction sinking stage. The self-weight sinking stops, the 13 self-weight sinking pneumatic valve is closed, the 14 suction sinking pneumatic valve is opened, the water pump is opened for suction, the 1 suction foundation is sunk, and the 24 stirring blade contacts the soil in the 1 suction foundation.

[0069] Step S1-3, suction stirring sinking stage. Open 21 main pipeline water inlet and 22 main pipeline water outlet respectively, use water pump to pump water at 22 main pipeline water outlet, water flow drives the lower connected 24 stirring rod and 25 stirring blade to rotate and cut the soil through 23 energy conversion device, at this time 14 suction sinking pneumatic valve is in suction state. In this process, suction and cutting are carried out at the same time, until 1 suction foundation sinks to the designated position below the mud surface.

[0070] Step S1-4, after sinking is completed, close 21 main pipeline water inlet, 22 main pipeline water outlet, 13 dead weight sinking pneumatic valve, 14 suction sinking pneumatic valve, 21 acceleration system water inlet and 22 acceleration system water outlet on the top cover of 1 suction foundation 11, after the above operation, the water pump is removed and recycled.

[0071] S2, use method of installation process identification system (such as Figure 6 Dotted arrow shown);

[0072] The use method S2 of the installation process identification system specifically comprises:

[0073] S2-1, main pipeline stirring rod rotating speed identification method, 2 main pipeline 22 main pipeline water outlet is connected with water pump to pump water, 21 main pipeline water inlet is water, at this time, 2 main pipeline water flow has a certain flow rate V1, 31 main pipeline water pressure sensor generates pressure data P1, the pressure P1 has a corresponding relationship with the flow rate V1 of the 2 main pipeline water flow, through the corresponding relationship, the flow rate V1 of the main pipeline water flow can be obtained according to P1. Again, A is the cross-sectional area of 2 main pipeline, the flow rate of 2 main pipeline is Q1, according to Q1=A*V1, Q1 is obtained. The flow rate Q of the energy conversion device in this section is Q1=A*V1, and the flow rate Q of the energy conversion device in this section is Q1=A*V1. The stirring rod rotating speed is Vrod, because the flow rate Q of the energy conversion device in this section has a corresponding relationship with the stirring rod rotating speed Vrod, through the corresponding relationship, the stirring rod rotating speed Vrod can be obtained according to Q, and according to the above calculation, the stirring rod rotating speed Vrod can be obtained according to the pressure data P1 generated by the 31 main pipeline water pressure sensor.

[0074] S2-2, the shunt pipe water flow rate identification method, the 42 opening and closing valve is opened, the water flow rate V2 is generated in the 41 shunt pipe, at this time the 32 shunt pipe water pressure sensor generates the pressure data P2, the pressure P2 has the corresponding relationship with the 41 shunt pipe water flow rate V2, through the corresponding relationship, the 41 shunt pipe water flow rate V2 can be obtained according to P2. The 41 shunt pipe flow rate is Q2, Q2 is obtained according to Q2=A*V2, A is the cross-sectional area of the 42 opening and closing device, the cross-sectional area is known and can be adjusted in size. According to the above, the 41 shunt pipe flow rate Q2 can be obtained according to the pressure data P2 generated by the 32 shunt pipe water pressure sensor, and P2 and Q2 are positively correlated. According to the flow rate in the 41 shunt pipe, the deceleration degree of the 41 shunt pipe to the water flow in the 2 main pipe can be judged. When the shunt degree of the shunt pipe is larger, P2 is larger at this time, and Q2 is larger according to the above analysis, the shunt flow rate of the 41 shunt pipe is larger at this time, which leads to the smaller flow rate Q1 of the main pipe, which leads to the smaller water flow rate of the 23 energy conversion device in the 2 main pipe, so the stirring rod speed is smaller at this time. When the shunt degree of the shunt pipe is smaller, P2 is smaller at this time, and Q2 is smaller according to the above analysis, the shunt flow rate of the 41 shunt pipe is smaller at this time, which leads to the larger flow rate Q1 of the main pipe, which leads to the larger water flow rate of the 23 energy conversion device in the 2 main pipe, so the stirring rod speed is larger at this time.

[0075] S2-3, the identification system troubleshooting method, 1 suction basis suction stirring sinking stage, when one or more 23 energy conversion devices in the 2 main pipe stop rotating because the resistance of the 24 stirring rod below is larger, at this time the 14 suction sinking pneumatic valve is closed to stop the suction of the suction basis, all 42 opening and closing devices in the 41 shunt pipe are opened, after all 42 opening and closing devices are opened, at this time all water flow in the 41 shunt pipe has a certain flow rate, then the 42 opening and closing valves in each 41 shunt pipe are closed in turn. First, if the water flow rate in the 2 main pipe does not change much after closing a certain 42 opening and closing valve, it proves that the resistance of the blade below the energy conversion device is smaller and the operation is normal and does not need to be accelerated. If the water flow rate in the 2 main pipe is seriously reduced or even stagnant after closing a certain 42 opening and closing valve, it can be judged that the resistance of the 24 stirring rod below the 23 energy conversion device corresponding to the 41 shunt pipe is larger and needs to be accelerated. Then according to this method, the 42 opening and closing valves are closed in turn for troubleshooting, after troubleshooting, all 24 stirring rods that need to be accelerated are accelerated in turn by using the 5 stirring rod acceleration system. After acceleration, the water pump of the 14 suction sinking pneumatic valve continues to suck and sink.

[0076] S3, the stirring rod deceleration system use method during installation (such as Figure 7 The dashed arrow is shown);

[0077] 1 suction foundation suction under stirring sinking phase, when the 1 suction foundation sinking occurs tilt, at this time, the 1 suction foundation low side 23 energy conversion device speed is reduced, the 1 suction foundation is uniformly sunk. Open 42 opening and closing device, reduce the flow through the corresponding 23 energy conversion device, realize the deceleration of 23 energy conversion device, the opening degree of 42 opening and closing device changes in real time according to the 23 energy conversion device speed obtained by 3 identification system.

[0078] S4, the use method of the stirring rod acceleration system for improving the speed of the first energy conversion device during installation (such as Figure 8 dotted arrow shown);

[0079] Open 52 stirring rod acceleration system outlet and 21 main pipeline inlet, 541 acceleration system pump water pipe pump water, at this time, the flow through 231 includes the initial flow generated by pump suction 22 and the additional flow generated by pump suction 52, the flow is increased, and the 24 stirring rod speed under 231 first energy conversion device is increased.

[0080] S5, the use method of the stirring rod acceleration system for improving the speed of the second energy conversion device during installation (such as Figure 9 dotted arrow shown);

[0081] Open 52 stirring rod acceleration system outlet and 51 stirring rod acceleration system inlet, 542 acceleration system pump water pipe pump water, the flow through 232 includes the initial flow generated by pump suction 22 and the additional flow generated by pump suction 52 stirring rod acceleration system, the flow is increased, and the 24 stirring rod speed under 232 second energy conversion device is increased.

[0082] S6, the use method of the stirring rod acceleration system for improving the speed of the third energy conversion device during installation (such as Figure 10 dotted arrow shown);

[0083] Open 52 stirring rod acceleration system outlet and 51 stirring rod acceleration system inlet, 543 acceleration system pump water pipe pump water, the flow through 233 includes the initial flow generated by pump suction 22 and the additional flow generated by pump suction 52 stirring rod acceleration system, the flow is increased, and the 24 stirring rod speed under 233 third energy conversion device is increased.

[0084] S7, the use method of the stirring rod acceleration system for improving the speed of the fourth energy conversion device during installation (such as Figure 11 dotted arrow shown);

[0085] Open 52 stirring rod acceleration system outlet and 51 stirring rod acceleration system water inlet, 544 acceleration system pump water pipe water pump, flow through 234 including the initial flow generated by the pump suction 22 and pump suction the additional flow generated by the 52 stirring rod acceleration system, the flow increases, can improve 234 fourth energy conversion device under 24 stirring rod speed.

[0086] S8, the use method of the fifth energy conversion device speed increasing of the stirring rod acceleration system in the installation process (such as Figure 12 Dotted arrow shown);

[0087] Open 52 stirring rod acceleration system outlet and 51 stirring rod acceleration system water inlet, 545 acceleration system pump water pipe water pump, flow through 235 including the initial flow generated by the pump suction 22 and pump suction the additional flow generated by the 52 stirring rod acceleration system, the flow increases, can improve 235 fifth energy conversion device under 24 stirring rod speed.

[0088] The places not mentioned in the application can be realized by using or referring to the existing technology.

[0089] The above only describes the embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. An erosion-resistant suction foundation for a marine jacket, characterized in that, include: A suction base body, the suction base body including a top cover and side walls; a main pipeline disposed below the top cover, the main pipeline having an inlet and an outlet; At least one energy conversion device installed in the main pipeline; a stirring rod and stirring blades connected to the energy conversion device; the energy conversion device is used to convert the kinetic energy of the water flowing through the main pipeline into mechanical energy to drive the stirring rod and stirring blades to rotate, thereby disturbing and breaking the soil inside the suction foundation, so that the suction foundation sinks and penetrates below the seabed mud surface under negative pressure.

2. The erosion-resistant suction foundation for a marine jacket as described in claim 1, characterized in that: The stirring rod does not penetrate the top cover, and the stirring rod is driven entirely by the water flow and energy conversion device in the main pipeline. The edge of the top cover is also provided with a water-permeable but sand-impermeable geotextile bag for collecting the soil discharged from the stirring.

3. The erosion-resistant suction foundation for a marine jacket as described in claim 1, characterized in that: The suction base also includes a self-weight sinking pneumatic valve and a suction sinking pneumatic valve installed on the top cover, used to discharge mud-water mixture at different sinking stages.

4. The erosion-resistant suction foundation for a marine jacket as described in claim 1, characterized in that: The suction base also includes an identification system, which includes a main pipeline water pressure sensor and a branch pipeline water pressure sensor, used to acquire water flow pressure and calculate the corresponding stirring rod speed.

5. The erosion-resistant suction foundation for a marine jacket as described in claim 1, characterized in that: The suction base also includes a stirring rod deceleration system, which includes a diversion pipe connected to the main pipeline and an opening and closing device installed in the diversion pipe. The speed of the corresponding stirring rod is reduced by adjusting the diversion flow rate.

6. The erosion-resistant suction foundation for a marine jacket as described in claim 1, characterized in that: The suction base also includes a stirring rod acceleration system, which includes an acceleration system inlet pipe and an acceleration system outlet pipe, and increases the stirring rod speed by providing additional water flow to the corresponding energy conversion device.

7. An installation method using the suction foundation described in any one of claims 1-6, characterized in that: (1) Mud contact and self-weight sinking stage. The suction foundation is hoisted into place and its bottom contacts the seabed. Self-weight sinking begins, allowing the suction foundation to sink into the mud by gravity. The mud-water mixture during the self-weight sinking stage is discharged from the suction foundation. (2) Suction sinking stage. When the self-weight sinking stops, the suction sinking begins. Turn on the water pump to draw water and make the suction foundation sink until the mixing blades contact the soil inside the suction foundation. (3) Suction mixing and settling stage. A water pump is used to draw water into the pipeline. The water flows through the energy conversion device and drives the mixing blades to rotate and cut the soil. During this process, the soil is cut while being drawn down by negative pressure until the suction foundation settles to the designated position below the mud surface. (4) After the sinking is completed, close the port on the top cover of the suction foundation that allows water exchange. After completing the above operations, remove and recycle the water pump.

8. The installation method according to claim 7, characterized in that, During the suction-stirring co-sinking stage, the rotation speed of each stirring rod is monitored in real time by the identification system, and the different stirring rods are accelerated or decelerated according to the monitoring results.

9. The installation method according to claim 7, characterized in that: When a tilting of the suction foundation is detected, the speed of the stirring rod on the lower side of the suction foundation can be reduced while the speed of the stirring rod on the higher side of the suction foundation is increased, so that the suction foundation can be restored to a uniform settling state.

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