A sinking construction system and construction method for a bucket foundation

Abstract

The present invention belongs to the field of bucket foundations for offshore wind turbines, and provides a sinking construction system and a construction method for a bucket foundation. The system includes a monitoring system, a vacuum pump system, a hydraulic system, a leveling system, and a vacuum pump suction system. The multi-system collaborative intelligent operation of the present invention improves the hoisting work efficiency of the bucket foundation. The present invention plays an important role in the penetration of the bucket foundation, especially in the suction penetration stage. Through real-time monitoring and dynamic leveling, it ensures the reasonable and correct attitude of the bucket body during the penetration process of the bucket foundation, and solves the problem of attitude control during the sinking construction of the bucket foundation. After the bucket foundation is penetrated and installed, the present invention realizes automatic separation and rapid recovery of the installation device, greatly improving the installation construction efficiency of the bucket foundation.

Description

Technical Field

[0001] The invention belongs to the field of bucket foundations for offshore wind turbines, and particularly relates to a sinking construction system and a construction method for a bucket foundation. Background Art

[0002] Offshore wind energy has great development prospects because of its high annual operating hours and no waste of land resources. However, compared with onshore wind power equipment, the environment where offshore wind power equipment is located is more complex, and the capital, manpower, and material resources required will further increase. This is mainly reflected in the high construction costs of wind turbines and foundation structures and high later operation and maintenance costs. Therefore, the bucket foundation, which is simple in construction, economical, and reliable, has gradually attracted the attention of engineers and scholars and has great development prospects. The installation methods of bucket foundations are mainly divided into suction sinking, pressing sinking, and vibration sinking, among which the suction sinking method is more common. Suction sinking is to use a vacuum pump to create a pressure difference inside and outside the bucket to achieve sinking and positioning. It should be noted that since the foundation installation process is significantly affected by the wind and wave environment and geological conditions, problems such as the inclination of the sinking posture of the bucket foundation will inevitably occur during the installation process, and this phenomenon is particularly prominent during the installation of large-sized single bucket foundations. The posture control during the sinking process of the bucket foundation is a decisive factor for the success or failure of the construction. Therefore, it is necessary to study and propose a refined sinking construction technical method for the bucket foundation.

[0003] On the other hand, the recovery of the installation tools for suction sinking is a rather difficult problem in construction, which is mainly divided into two parts, namely the recovery of the vacuum pump and the recovery of the sinking penetration auxiliary device (such as the guiding frame during hoisting). Among them, for the recovery of the vacuum pump, it is necessary to arrange professional personnel to dive to the installation position of the bucket foundation to separate the connecting pipeline between the vacuum pump and the bucket foundation and the interface of the bucket foundation. The construction operation is complex and has a certain degree of danger. Therefore, it is necessary to propose a more convenient and safe device recovery method for the sinking construction of the bucket foundation. Summary of the Invention

[0004] To solve the above technical problems, the invention provides a sinking construction system and a construction method for a bucket foundation to solve the problems in the prior art. The technical solution adopted by the invention is as follows:

[0005] A sinking construction system for a bucket foundation includes a hydraulic system 3, a leveling system 4, and a vacuum pump suction system 5;

[0006] The hydraulic system 3 includes a bracket and a boom, the boom is installed on the bracket, and the leveling system 4 is arranged at the lifting end of the boom;

[0007] The leveling system 4 includes adsorption claws 4.1, a vacuum pump 4.2, telescopic rods 4.3, and an annular fixing frame. The annular fixing frame is sleeved on the barrel-shaped foundation. A plurality of the adsorption claws 4.1 are installed on the annular fixing frame. Each of the plurality of adsorption claws 4.1 is connected to a telescopic rod 4.3. The top of the telescopic rod 4.3 is rotatably connected to an annular top frame. The annular top frame is fixedly connected to the lifting end of the lifting arm. The telescopic rod 4.3 is used to drive the adsorption claws 4.1 to push the barrel-shaped foundation to shift, thereby realizing the leveling function.

[0008] The vacuum pump 4.2 is installed on the annular top frame. The vacuum pump 4.2 is communicated with the inside of the barrel-shaped foundation through the vacuum pump suction system 5.

[0009] Further, the vacuum pump suction system 5 includes a vacuum pump interface housing 5.1, an inner ring 5.2, a sealing ring 5.3, an air extraction duct 5.4, a compression piston 5.5, a towing rope 5.6, and a spring 5.7.

[0010] The vacuum pump interface housing 5.1 is sleeved on the barrel-shaped foundation. The inner ring 5.2 is slidably arranged on the inner wall surface of the vacuum pump interface housing 5.1. The inner ring 5.2 is located between the vacuum pump interface housing 5.1 and the barrel-shaped foundation.

[0011] The sealing ring 5.3 is arranged on the inner side of the end of the inner ring 5.2. The sealing ring 5.3 is located at one end of the barrel-shaped foundation. The other end of the barrel-shaped foundation is communicated with the vacuum pump 4.2 through the air extraction duct 5.4. A side pipe is connected in parallel to the air extraction duct 5.4. The compression piston 5.5 is arranged in the side pipe. The compression piston 5.5 is fixedly connected to the inner ring 5.2 through the towing rope 5.6. A stop block is fixedly arranged on the inner wall surface of the vacuum pump interface housing 5.1. The spring 5.7 is arranged between the stop block and the inner ring 5.2. The spring 5.7 is sleeved on the towing rope 5.6.

[0012] The present invention can use the monitoring system 1 to monitor the key parameters during the installation of the barrel-shaped foundation and the recovery of the lifting tool throughout the process, and accurately regulate the vacuum pump 4.2 and the hydraulic system 3 according to the monitored parameters. Among them, with the help of the vacuum pump system 4.2, the sinking rate of the barrel-shaped foundation can be effectively controlled, and the hydraulic system 3 can reasonably distribute and convey the appropriate pressure to each specific mechanical device (such as the telescopic operation of the lifting arm, etc.).

[0013] A construction method for the sinking of a barrel-shaped foundation includes the following steps:

[0014] The first step, ship anchoring: After the barrel-shaped foundation is transported to the construction site, the crane ship arrives at the designated position.

[0015] Step 2: Foundation hoisting: connect the suction claw 4.1 to the barrel foundation, and connect the vacuum pump 4.2 to the top of the barrel foundation through the vacuum duct 5.4 and the vacuum interface;

[0016] The third step is foundation penetration: it is divided into two stages, self-sinking into the mud and negative pressure penetration;

[0017] Self-sinking stage: When the bucket foundation is lowered to 2m from the mud surface, the posture of the bucket foundation is corrected by the suction claw 4.1. After confirmation, the bucket foundation is lowered until it self-sinks into the mud;

[0018] When the barrel foundation cannot continue to sink by its own weight, it will enter the negative pressure penetration stage after being left still for 3 hours: the vacuum pump 4.2 will evacuate the air and the monitoring system 1 will monitor the real-time pressure difference between the inside and outside of the barrel foundation and the sinking posture, so that the barrel foundation can be smoothly penetrated under the action of a reasonable pressure difference between the inside and outside;

[0019] Step 4: Device recovery:

[0020] After the barrel foundation is penetrated into place, various parameters of the barrel foundation are re-measured. After the parameters are verified to meet the design requirements, the vacuum pump 4.2 and the suction claw 4.1 are separated from the barrel foundation.

[0021] Furthermore, the required negative pressure in the bucket foundation is calculated by the following method:

[0022] When the bucket foundation is sunk and placed, the sinking resistance at the penetration depth z is:

[0023] R=R side +R tip =A wall ·α·s u +(N c ·s u,tip +γ'·z)A tip (1)

[0024] Among them, A wall A is the sum of the contact areas between the inner and outer walls of the barrel and the soil; tip is the base bottom area; s u is the average direct shear undrained shear strength at penetration depth; α is the friction coefficient of the barrel wall; s u,tip is the average undrained shear strength of bucket end triaxial compression, triaxial tension and direct shear; γ' is the effective weight of soil; N c is the bearing capacity coefficient under plane strain conditions; z is the penetration depth;

[0025] The negative pressure required for the bucket foundation to sink is:

[0026] Δu n =(R-W') / A c (2)

[0027] Wherein: W' is the basic floating weight; A c is the negative pressure loading plane area inside the bucket;

[0028] The maximum allowable negative pressure for sinking is:

[0029] Δu a = N c ·s u,tip + A in ·α·s u / A c (3)

[0030] Wherein, A in is the contact area between the inner wall of the bucket and the soil body.

[0031] The present invention has the following beneficial effects:

[0032] (1) The multi-system collaborative and intelligent operation of the present invention improves the hoisting work efficiency of the bucket foundation;

[0033] (2) The present invention plays an important role in the penetration of the bucket foundation, especially in the suction penetration stage. By real-time monitoring and dynamic leveling, it ensures the reasonable and correct attitude of the bucket body during the penetration process of the bucket foundation, and solves the problem of controlling the construction attitude of the bucket foundation during sinking;

[0034] (3) After the bucket foundation is penetrated and installed, the present invention realizes automatic separation and rapid recovery of the installation device, greatly improving the installation construction efficiency of the bucket foundation. Description of the Drawings

[0035] Figure 1 is the overall structure schematic diagram;

[0036] Figure 2 is the leveling system schematic diagram;

[0037] Figure 3 is the vacuum pump suction system schematic diagram;

[0038] Figure 4 is the method flow chart of the present invention. Detailed Embodiments

[0039] Next, in combination with the Figures 1-4 in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. If not specifically specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0040] A sinking construction system for a bucket foundation includes a monitoring system 1, a vacuum pump system 2, a hydraulic system 3, a leveling system 4, and a vacuum pump suction system 5;

[0041] The hydraulic system 3 includes a bracket and a boom. The boom is installed on the bracket, and a leveling system 4 is provided at the lifting end of the boom.

[0042] The leveling system 4 includes adsorption claws 4.1, a vacuum pump 4.2, telescopic rods 4.3, and an annular fixing frame. The annular fixing frame is sleeved on the barrel-shaped foundation. A plurality of the adsorption claws 4.1 are installed on the annular fixing frame. Each of the plurality of adsorption claws 4.1 is connected to a telescopic rod 4.3. The top of the telescopic rod 4.3 is rotatably connected to an annular top frame. The annular top frame is fixedly connected to the lifting end of the boom. The telescopic rod 4.3 is used to drive the adsorption claw 4.1 to push the barrel-shaped foundation to offset, so as to realize the leveling function. An electromagnetic adsorption device 4.1.1 is provided at the end of the adsorption claw 4.1 for abutting against the barrel-shaped foundation.

[0043] The vacuum pump 4.2 is installed on the annular top frame. The vacuum pump 4.2 is communicated with the inside of the barrel-shaped foundation through the vacuum pump suction system 5.

[0044] The vacuum pump 4.2 is connected to the vacuum pump system 2 and is used to control the operation of the vacuum pump 4.2. The monitoring system 1, the vacuum pump system 2, and the hydraulic system 3 are installed on the platform of the construction ship. The monitoring system 1 mainly includes attitude monitoring, negative pressure monitoring, and displacement monitoring. Among them, the target of attitude monitoring is to monitor the barrel body attitude during the whole process of the barrel-shaped foundation being hoisted and sunk, which is mainly realized by the barrel top inclination angle measured by a two-way inclinometer. The target of negative pressure monitoring is to monitor the pressure difference inside and outside the barrel during the whole process of the barrel-shaped foundation sinking, which is mainly realized by the pressure sensors installed inside and outside the barrel top. The target of displacement monitoring is to monitor the relative position between the adsorption claw 4.1 and the barrel-shaped foundation, which is mainly realized by a displacement sensor. The telescopic rod 4.3 can be a hydraulic rod, which is connected to the hydraulic system 3 to provide hydraulic pressure.

[0045] The leveling system 4 refers to a system for dynamically leveling the barrel body attitude during the sinking process of the barrel-shaped foundation, which is realized by the coordinated adjustment of the telescopic of the telescopic rod 4.3 and the pumping speed of the vacuum pump 4.2. The leveling system 4 aims to ensure that the barrel-shaped foundation always maintains an ideal attitude during the penetration process to achieve precise positioning and stable penetration. In addition, in order to facilitate the recovery of the device after the barrel-shaped foundation sinks, the separation of the adsorption claw 4.1 from the barrel-shaped foundation is mainly achieved by cutting off the power supply to the electromagnetic adsorption device 4.1.1 on the adsorption claw 4.1, so that the suction force of the adsorption claw 4.1 on the barrel-shaped foundation is weakened and the separation of the two is realized. The adsorption claw 4.1 is movably connected to the annular fixing frame, and the extrusion of the barrel-shaped foundation is realized by the telescopic of the telescopic rod 4.3, so that one or more of the adsorption claws 4.1 push the barrel-shaped foundation to offset. The boom is a prior art and can be telescoped and rotated. Its lifting end is the lifting tool at the end of the lifting rope, and the lifting tool is fixedly connected to the annular top frame.

[0046] Further, the vacuum pump suction system 5 includes a vacuum pump interface housing 5.1, an inner ring 5.2, a sealing ring 5.3, an air extraction conduit 5.4, a compression piston 5.5, a traction rope 5.6, and a spring 5.7;

[0047] The vacuum pump interface housing 5.1 is sleeved on the barrel-shaped foundation. The inner ring 5.2 is slidably arranged on the inner wall surface of the vacuum pump interface housing 5.1, and the inner ring 5.2 is located between the vacuum pump interface housing 5.1 and the barrel-shaped foundation;

[0048] The sealing ring 5.3 is arranged on the inner side of the end of the inner ring 5.2. The sealing ring 5.3 is located at one end of the barrel-shaped foundation. The other end of the barrel-shaped foundation is connected to the vacuum pump 4.2 through the air extraction conduit 5.4. A side pipe is connected in parallel to the air extraction conduit 5.4, and the compression piston 5.5 is arranged in the side pipe. The compression piston 5.5 is fixedly connected to the inner ring 5.2 through the traction rope 5.6. A stop block is fixedly arranged on the inner wall surface of the vacuum pump interface housing 5.1, and the spring 5.7 is arranged between the stop block and the inner ring 5.2. The spring 5.7 is sleeved on the traction rope 5.6.

[0049] The vacuum pump 4.2 is docked with the air extraction port of the barrel-shaped foundation. The air extraction port of the barrel-shaped foundation is connected to the vacuum pump 4.2 at the sealing ring 5.3. The sealing ring 5.3 is made of steel sheet and has a certain elasticity. When the vacuum pump works, the gas and water in the barrel are sucked along the conduit 5.4. When the air extraction conduit 5.4 sucks air, it will drive the compression piston 5.5 to move. The compression piston 5.5 will drive the traction rope 5.6 and stretch the inner ring 5.2 to move. The spring 5.7 is compressed. When the inner ring 5.2 is pulled backward, it will tighten the front sealing film, thus achieving the locking function during air extraction and realizing the automatic sealing of the interface when the vacuum pump 4.2 sucks air. Among them, it is through between the sealing ring 5.3 and the air extraction conduit 5.4. When the vacuum pump 4.2 works and sucks air, it sucks air from the direction of the air extraction conduit 5.4 and extracts the air in the foundation through the sealing ring 5.3.

[0050] The vacuum pump is separated from the air extraction port of the bucket foundation. When the suction penetration operation is completed or it is necessary to stop vacuum pumping for other reasons, the air and water flow velocity sucked by the vacuum pump slows down to a standstill, the air extraction stops at the air extraction conduit 5.4, the force required for the piston movement in the compression device 5.5 disappears, the traction force of the traction rope 5.6 on the inner ring 5.2 disappears. Due to the disappearance of the traction force, the elastic potential energy of the spring 5.7 is released to push the inner ring 5.2 to rebound, and its restraint on the sealing ring 5.3 disappears, causing the sealing ring 5.3 to loosen from the air extraction port of the bucket foundation. Then, with the lifting of the hoisting device, the separation is completed. At this time, the automatic separation of the vacuum pump 4.2 from the air extraction port at the top of the bucket of the bucket foundation is achieved when the air extraction stops. The vacuum pump interface housing 5.1 only serves to wrap the components of the air extraction device and there is no link for removal. The sealing ring 5.3 does not move upward, and the inner ring 5.2 moves upward to compress and tighten the sealing ring 5.3, and there is no interference between the inner ring 5.2 and the air extraction conduit 5.4.

[0051] A method for sinking construction of a bucket foundation includes the following steps:

[0052] The first step, ship anchoring: After the bucket foundation is transported to the construction site, the crane ship uses on-board GPS and ship positioning software for precise positioning, arrives at the designated position of the machine, and in order to reduce the problems of hoisting safety and inconvenience caused by the hull shaking during hoisting, it is necessary to drop the anchor and stay in position. The crane ship stays in position against the current at the position of the machine.

[0053] The second step, foundation hoisting: Connect the adsorption claws 4.1 to the bucket foundation. Six arc-shaped claws are evenly distributed around the top of the bucket. Rubber pads are arranged inside the claws to increase the friction force and prevent scratching the bucket wall. In particular, a magnetic suction chuck base is provided at the hinge of the telescopic rod 4.3 and the adsorption claw 4.1, ensuring a firm connection between the lifting tool and the bucket foundation, and ensuring the attitude dynamic leveling during the process of the foundation penetrating into the seabed and penetrating to the predetermined depth. Connect the vacuum pump 4.2 to the vacuum interface and energize it to firmly connect the air extraction conduit 5.4 to the vacuum interface at the top of the bucket foundation.

[0054] The third step, foundation penetration: The process of the bucket foundation penetrating is divided into two stages, namely self-sinking into the mud and negative pressure penetration. In the stage of self-sinking into the mud, when the bucket foundation is lowered to 2 m from the mud surface, record the monitoring data of the two-way inclinometer and combine the water flow direction and velocity data, and use the adsorption claws to dynamically correct the attitude of the bucket foundation. After confirmation, continue to lower the bucket foundation to self-sink into the mud until a bucket-soil sealing condition for suction sinking can be formed (the penetration depth into the mud exceeds 2 m). During the process of forming the sealing condition, pay attention to observing the attitude of the bucket foundation to avoid the phenomenon of excessive tilting of the bucket body. When the level exceeds the standard, adjust the boom and the adsorption claws until the attitude of the bucket foundation meets the requirements and then lower it again;

[0055] When the bucket foundation can no longer sink by its own weight, it is left to stand for another 3 hours to ensure the formation of a seal, and then it enters the negative pressure penetration stage. At this time, the vacuum pump 4.2 is activated for negative pressure sinking. The vacuum pump 4.2 pumps air, and the monitoring system 1 monitors the real-time air pressure difference inside and outside the bucket foundation and the sinking attitude, so that the bucket foundation can be smoothly penetrated under the action of a reasonable internal and external pressure difference.

[0056] During the penetration and sinking process, special attention should be paid to the control and adjustment of the bucket foundation attitude. The sinking attitude of the bucket foundation is recorded by a two-way inclinometer. When the horizontal deviation approaches the limit of the design requirement (2‰), according to the actual inclination situation, the vacuum pump 4.2 and the leveling system 4 work together. The vacuum pump 4.2 will control the internal and external pressure difference of the bucket foundation at an appropriate value to slow down the penetration speed of the foundation. Synchronously, the leveling system 4 will adjust the telescopic rods 4.3 on the six adsorption claws 4.1 according to the horizontal deviation to bring the level back to the design threshold, and then the penetration operation will be carried out again. According to the monitored sinking attitude of the bucket foundation body, the above-mentioned coordinated operation of the vacuum pump 4.2 and the leveling system 4 is repeated until the level of the bucket foundation in place reaches the design allowable range. The design allowable range includes that after the foundation sinking is completed, the top rotation angle of the foundation should be measured, and the deviation of the top rotation angle of the foundation should be ensured to be ≤2‰; after the foundation sinking is completed, the top level of the foundation should be measured, and the horizontal deviation should be ensured to be ≤3‰;

[0057] Step 4, device recovery:

[0058] When the bucket foundation is penetrated in place, the parameters of the bucket foundation are re-measured. After the parameters are verified to meet the design requirements, after issuing the device recovery instruction, two parts of the recovery operation will be carried out, that is, the separation of the vacuum pump 4.2 from the bucket foundation and the separation of the adsorption claws 4.1 from the bucket foundation.

[0059] Furthermore, the negative pressure required inside the bucket foundation is calculated by the following method:

[0060] When the bucket foundation is sunk and placed, the resistance received by the foundation needs to be considered. Based on the effective stress and bearing capacity theory, the sinking resistance of the bucket foundation at the penetration depth z:

[0061] R = R side +R tip = A wall ·α·s u +(N c ·s u,tip +γ'·z)A tip (1)

[0062] Among them, Awall is the sum of the contact areas between the inner and outer walls of the bucket and the soil; Atip is the bottom area of the foundation; s uis the average direct shear undrained shear strength of the penetration depth; α is the coefficient of skin friction of the bucket wall, and it is recommended to take 1 / St (St is the soil sensitivity); su,tip is the average undrained shear strength of triaxial compression, triaxial tension, and direct shear at the bucket tip; γ' is the effective unit weight of the soil; Nc is the bearing capacity coefficient under plane strain conditions, which can be taken as 6.2 - 9 according to the penetration depth-diameter ratio of the bucket foundation; z is the penetration depth.

[0063] Accordingly, the negative pressure required for the bucket foundation to sink is:

[0064] Δu n =(R - W') / A c (2)

[0065] Where: W' is the buoyant weight of the foundation; A c is the plane area of negative pressure loading inside the bucket.

[0066] When the applied negative pressure is too large, the soil at the bucket tip flows into the bucket, generating an excessive soil plug, which affects the penetration of the foundation. Therefore, the maximum allowable negative pressure for sinking is:

[0067] Δu a =N c ·s u,tip +A in ·α·s u / A c (3)

[0068] Where, A in is the contact area between the inner wall of the bucket and the soil.

[0069] The magnitude of the load required for leveling is related to the actual inclination and changes dynamically. The leveling force applied by the telescopic rod 4.3 should increase gradually from 0.

[0070] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, variations, modifications, and substitutions made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A sinking construction system for a barrel foundation, characterized in that: It includes a hydraulic system (3), a leveling system (4) and a vacuum pump suction system (5); The hydraulic system (3) comprises a bracket and a boom, the boom is mounted on the bracket, and the leveling system (4) is arranged at the lifting end of the boom; The leveling system (4) comprises a suction claw (4.1), a vacuum pump (4.2), a telescopic rod (4.3), and an annular fixing frame; the annular fixing frame is sleeved on a barrel-shaped foundation, a plurality of the suction claws (4.1) are mounted on the annular fixing frame, the plurality of the suction claws (4.1) are respectively connected to the telescopic rod (4.3), the top of the telescopic rod (4.3) is rotatably connected to an annular top frame, the annular top frame is fixedly connected to the lifting end of the boom, and the telescopic rod (4.3) is used to drive the suction claw (4.1) to push the barrel-shaped foundation to deflect, thereby realizing a leveling function; The vacuum pump (4.2) is installed on the annular top frame, and the vacuum pump (4.2) is connected to the interior of the barrel foundation through the vacuum pump suction system (5); The vacuum pump suction system (5) comprises a vacuum pump interface housing (5.1), an inner ring (5.2), a sealing ring (5.3), an air extraction duct (5.4), a compression piston (5.5), a traction rope (5.6) and a spring (5.7); The vacuum pump interface housing (5.1) is sleeved on a barrel-shaped foundation, the inner ring (5.2) is slidably arranged on an inner wall surface of the vacuum pump interface housing (5.1), and the inner ring (5.2) is located between the vacuum pump interface housing (5.1) and the barrel-shaped foundation; The sealing ring (5.3) is arranged on the inner side of the end of the inner ring (5.2), and the sealing ring (5.3) is located at one end of the barrel-shaped foundation. The other end of the barrel-shaped foundation is connected to the vacuum pump (4.2) through the exhaust duct (5.4). The exhaust duct (5.4) is connected in parallel with a side tube. The compression piston (5.5) is arranged in the side tube. The compression piston (5.5) is fixedly connected to the inner ring (5.2) through the traction rope (5.6). A stopper is fixedly arranged on the inner wall surface of the vacuum pump interface shell (5.1). The spring (5.7) is arranged between the stopper and the inner ring (5.2), and the spring (5.7) is sleeved on the traction rope (5.6).

2. A method for sinking a barrel foundation, applied to a barrel foundation sinking construction system according to claim 1, characterized in that: The following steps are involved: The first step is ship anchoring: after the barrel foundation is transported to the construction site, the crane ship arrives at the designated position; Step 2: Foundation hoisting: connect the suction claw (4.1) to the barrel foundation, and connect the vacuum pump (4.2) to the top of the barrel foundation through the air extraction duct (5.4) and the vacuum interface; The third step is foundation penetration: it is divided into two stages, self-sinking into the mud and negative pressure penetration; Self-sinking stage: When the bucket foundation is lowered to 2m from the mud surface, the posture of the bucket foundation is corrected by the suction claws (4.1). After confirmation, the bucket foundation is lowered until it sinks into the mud. When the bucket foundation cannot continue to sink by its own weight, it will enter the negative pressure penetration stage after being left to stand for another 3 hours: the vacuum pump (4.2) will evacuate the air and the monitoring system (1) will monitor the real-time pressure difference between the inside and outside of the bucket foundation and the sinking posture, so that the bucket foundation can be smoothly penetrated under the action of a reasonable pressure difference between the inside and outside; Step 4: Device recovery: After the barrel foundation is penetrated into place, various parameters of the barrel foundation are re-measured. After the parameters are verified to meet the design requirements, the vacuum pump (4.2) and the suction claw (4.1) are separated from the barrel foundation.

3. The sinking construction method of a barrel foundation according to claim 2, characterized in that: The required negative pressure in the bucket foundation is calculated by the following method: When the barrel foundation is sunk, the penetration depth of the barrel foundation is z Sinking resistance: ； in, A wall It is the sum of the contact areas between the inner and outer walls of the barrel and the soil; A tip is the base bottom area; is the average direct shear undrained shear strength at the penetration depth; α is the friction coefficient of the barrel wall; s u,tip is the average undrained shear strength of barrel end triaxial compression, triaxial tension, and direct shear; is the effective weight of soil; N c is the bearing capacity coefficient under plane strain conditions; z is the penetration depth; The negative pressure required for the bucket foundation to sink is: ； in: As the basic floating weight; It is the negative pressure loading plane area in the barrel; The maximum allowable negative pressure for sinking is: ； in, It is the contact area between the inner wall of the barrel and the soil.

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