A cylindrical foundation with an auxiliary sinking counterweight structure and its construction method

Abstract

The present invention discloses a cylindrical foundation with an auxiliary sinking counterweight structure, comprising a cylindrical foundation structure; the cylindrical foundation structure includes a column, a transition section and a suction bucket; a transition section is arranged at the top of the suction bucket; a column is arranged at the top of the transition section; the suction bucket includes a suction bucket outer wall with an open bottom; a suction bucket top is arranged at the top of the suction bucket outer wall; a plurality of water jet high-pressure pipes are arranged on the outer circumferential walls around the suction bucket outer wall; a circumferentially extended bladder is wrapped around the outer wall of the column; a counterweight support frame including a plurality of counterweight support rods is placed at the top of the column; counterweight bags are respectively suspended at the outer ends of each counterweight support rod; a circumferential counterweight structure around the top of the suction bucket is arranged radially around the top of the suction bucket top. The present invention also correspondingly provides a construction method for the cylindrical foundation. By arranging bladders, bags and membrane structures around the cylindrical foundation, the present invention increases the counterweight and the seepage path, assists the cylindrical foundation to sink and be in place, and ensures that the cylindrical foundation sinks to the designed depth under complex geological conditions.

Description

Technical Field

[0001] The present invention relates to the technical fields of wind energy engineering, new energy, and ocean engineering, and particularly relates to a cylindrical foundation with an auxiliary sinking counterweight structure and a construction method thereof. Background Art

[0002] Wind energy is an inexhaustible and renewable clean energy source. At present, wind power generation is one of the most promising sustainable projects.

[0003] At present, as a non-hydro new energy, offshore wind power plays an increasingly important role. Modern wind turbines mainly include a tower barrel and a wind turbine generator arranged at the top of the tower barrel, and the key to ensuring the safe and normal operation of the wind turbine is: the wind power foundation structure that supports the tower barrel, or what is commonly referred to as the wind turbine foundation. It should be noted that the tower barrel generally refers to the vertical section above the wind power foundation and is a conventional upper structure and does not belong to the internal structure of the foundation.

[0004] In order to develop offshore wind power safely, economically, efficiently, and on a large scale, it is particularly important to select a suitable foundation structure form. Among them, the cylindrical foundation structure can be prefabricated on land and can be quickly installed on site using a small pump valve system, and has been widely used in major wind farms around the world.

[0005] China has a long north-south coastline, and the geological differences in different sea areas are extremely large, which often brings great challenges to the on-site sinking and installation operations of offshore wind power cylindrical foundations. Especially when sinking and installing cylindrical foundations in sea areas with thick sandy soil layers and shallow stratified soil, various problems during the construction process, such as seepage failure, buckling of the barrel wall, and soil plugging, are often encountered, which further leads to the problem of being unable to sink the foundation to the designed depth.

[0006] The sinking process of the cylindrical foundation after it enters the soil is divided into the self-weight sinking stage and the differential pressure sinking stage. All the above problems in the construction are concentrated in the second differential pressure sinking stage. The main reason is that the self-weight of the cylindrical foundation sinks to a relatively shallow depth in the first stage, and then the pump valve is opened, resulting in the premature implementation of the second stage. At this time, the differential pressure is too small, and the cylindrical foundation cannot continue to sink. If the differential pressure is increased, problems such as soil seepage failure, buckling of the barrel wall, and soil plugging may occur. Summary of the Invention

[0007] The purpose of the present invention is to provide a cylindrical foundation with an auxiliary sinking counterweight structure and a construction method thereof in view of the technical defects existing in the prior art.

[0008] To this end, the present invention provides a cylindrical foundation with an auxiliary sinking counterweight structure, which includes a cylindrical foundation structure;

[0009] The cylindrical foundation structure includes a column, a transition section, and a suction barrel;

[0010] At the top of the cylindrical suction cylinder, a transition section in the shape of a frustum of a cone is fixedly arranged.

[0011] At the top of the transition section, a vertically distributed column is fixedly arranged.

[0012] Among them, the suction cylinder includes an annular suction cylinder outer wall with an open bottom.

[0013] At the top of the suction cylinder outer wall, a circular suction cylinder top is fixedly arranged.

[0014] Among them, on the outer circumferential wall of the suction cylinder outer wall, a plurality of vertically distributed and hollow water jet high-pressure pipes are arranged at equal intervals.

[0015] The bottom of the water jet high-pressure pipe is flush with the bottom of the suction cylinder outer wall.

[0016] The bottom of the water jet high-pressure pipe is open.

[0017] Among them, on the outer circumferential wall of the column in the radial direction, a circumferentially extended bladder is wrapped.

[0018] The bottom of the circumferentially extended bladder is in contact with the top of the transition section.

[0019] Among them, at the central position of the top of the column, a counterweight support frame is placed.

[0020] The counterweight support frame includes a plurality of counterweight support rods evenly distributed along the circumferential direction.

[0021] The outer end of each counterweight support rod protrudes outward from the top of the column, and at least one counterweight bag is respectively suspended.

[0022] Around the top of the suction cylinder top in the radial direction, a circumferential counterweight structure on the top of the cylinder is arranged.

[0023] The circumferential counterweight structure on the top of the cylinder is used to increase the counterweight around the top of the suction cylinder top in the radial direction.

[0024] Preferably, the cylindrical foundation structure is a support structure with an open bottom inserted into the soil and the upper part exposed above the water surface.

[0025] Preferably, the suction cylinder is a steel or concrete structure with an open bottom, a closed top, and closed side walls around.

[0026] Preferably, the circumferential counterweight structure on the top of the cylinder specifically includes: a plurality of vertical expansion bladders and a plurality of horizontal expansion bladders.

[0027] At the radial circumferential edge of the top of the suction cylinder top, the bottoms of a plurality of vertical expansion bladders are connected at equal intervals along the circumferential direction.

[0028] At the top radial peripheral edge of the suction cylinder top, at positions corresponding to the outer sides of each vertical expansion bladder, the inner ends of a horizontal expansion bladder are respectively connected;

[0029] Among them, between any two adjacent vertical expansion bladders and between any two adjacent horizontal expansion bladders, they are respectively connected by a geotextile membrane.

[0030] Preferably, the geotextile membrane is fixedly connected to the radial peripheral edge of the suction cylinder top;

[0031] The inner and outer sides of each vertical expansion bladder are adhesively bonded or sewn to the geotextile membrane to jointly form a circumferential airtight structure;

[0032] The upper and lower sides of the horizontal expansion bladder are adhesively bonded or sewn to the geotextile membrane;

[0033] The vertical expansion bladder, the geotextile membrane and the suction cylinder top jointly form a space that is circumferentially and bottom airtight and top open.

[0034] Preferably, at the top of the inner end of each horizontal expansion bladder, a horizontal expansion bladder inlet is provided as the feed port of the horizontal expansion bladder;

[0035] At the center position of the outer end of each horizontal expansion bladder, a horizontal expansion bladder outlet is provided as the discharge port of the horizontal expansion bladder;

[0036] Among them, at the center position of the top of each vertical expansion bladder, a vertical expansion bladder inlet is provided;

[0037] At the outer side of the bottom of each vertical expansion bladder, a vertical expansion bladder outlet is provided;

[0038] Among them, at the outer side of the top of the circumferential extension bladder, a circumferential extension bladder inlet is opened;

[0039] At the outer side of the bottom of the circumferential extension bladder, a circumferential extension bladder outlet is opened;

[0040] Among them, the counterweight bag is a hollow and closed bag structure, and a counterweight belt inlet is provided at its top;

[0041] A counterweight bag outlet is provided at the bottom of the counterweight bag.

[0042] Preferably, the counterweight structure around the cylinder top may specifically include an annular expansion bladder;

[0043] The annular expansion bladder is fixedly adjacent to the top radial peripheral edge of the suction cylinder top;

[0044] The annular expansion bladder includes a plurality of vertical annular bladders vertically distributed and a plurality of horizontal annular bladders horizontally distributed;

[0045] Any two adjacent vertical annular bladders are connected (with a connection channel);

[0046] Any two adjacent horizontal annular sacs are connected (with a connection channel);

[0047] The innermost horizontal annular sac is connected to the lowermost vertical annular sac.

[0048] In addition, the present invention also provides a construction method for the cylindrical foundation with the auxiliary sinking counterweight structure described above, which includes the following steps:

[0049] The first step is to pre-fabricate the columns, transition sections, and suction buckets in the offshore wind farm, and then assemble them into a cylindrical foundation structure;

[0050] Among them, the suction bucket includes an annular suction bucket outer wall with an open bottom;

[0051] At the top of the suction bucket outer wall, a circular suction bucket top is fixedly arranged;

[0052] The second step is to connect each sac structure including the horizontal expansion sac, vertical expansion sac, and circumferential extension sac to the cylindrical foundation structure. Among them, after the horizontal expansion sac is connected to the geotextile membrane, it is placed on the outermost side of the top of the suction bucket top in the suction bucket to facilitate horizontal extension, and the geotextile membrane is hermetically connected to the top of the suction bucket top; after the vertical expansion sac is circumferentially connected to the geotextile membrane, it is placed on the top of the suction bucket top to facilitate vertical extension; and the circumferential extension sac is arranged around the column in the cylindrical foundation structure; at the same time, a plurality of water jet high-pressure pipes are also arranged on the outer sides of the four sides of the suction bucket outer wall, and the corresponding high-pressure water delivery pipelines are connected;

[0053] The third step is to place a horizontally telescopic counterweight support frame on the top of the column, and hang a preset number of counterweight bags at the outer ends of each counterweight support rod in the counterweight support frame;

[0054] The fourth step is to transport the cylindrical foundation structure to the target sea area at the designated position in the offshore wind farm by barge dry transportation or wet towing floating transportation for preparation of installation;

[0055] The fifth step is for the cylindrical foundation structure. First, perform the self-weight sinking stage, and then perform the auxiliary counterweight sinking stage in the sixth step;

[0056] The sixth step is to perform the auxiliary counterweight sinking stage of the cylindrical foundation structure: add counterweights to each sac structure including the horizontal expansion sac, vertical expansion sac, and circumferential extension sac and the counterweight bags by filling, and the counterweights include water and / or sea sand;

[0057] Step 7: Execute the differential pressure sinking stage of the cylindrical foundation structure: At the target sea area of the designated position in the offshore wind farm, adopt the existing differential pressure sinking method to continue sinking the cylindrical foundation structure to the seabed. Among them, the overall height of the cylindrical foundation structure is higher than the water depth of the target sea area.

[0058] Preferably, after Step 7, the following steps may further be included:

[0059] Step 8: Water jet assisted sinking operation: For the high-pressure water pipe of the water jet pre-buried on the outer wall of the suction cylinder, inject high-pressure water into the high-pressure water pipe to break up the soil layer under the bottom of the cylindrical foundation structure.

[0060] Preferably, after Step 8, the following steps may further be included:

[0061] Step 9: Recover the bladder structure: Disassemble and recover the vertical telescopic bladder, circumferential extension bladder, counterweight bag and counterweight support frame.

[0062] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a cylindrical foundation with an auxiliary sinking counterweight structure and its construction method. Its design is scientific. By arranging bladders, bags and membrane structures around the cylindrical foundation, and by increasing the counterweight and increasing the seepage path, it is used to assist the cylindrical foundation to sink and be in place, which can effectively solve the problem that the cylindrical foundation cannot be sunk to the designed depth in complex geological conditions, and has great practical significance.

[0063] The technical solution of the present invention is based on the principle of temporarily increasing the structural counterweight and improving the seepage path, and fully considers the convenience, economy of the counterweight materials available at sea and the early utilization of the erosion protection film. By filling sand or water into the recoverable bladders and bags to increase the counterweight, the sinking resistance of the cylindrical foundation is overcome; and the self-extendable erosion protection film is used to advance the erosion operation to the sinking stage for construction, which can not only assist the sinking of the cylindrical foundation, but also be used as the erosion protection measure for the cylindrical foundation in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is a three-dimensional structural schematic diagram of the cylindrical foundation that needs to be assisted in sinking and counterweighted by the present invention;

[0065] Figure 2 is a front view of the cylindrical foundation that needs to be assisted in sinking and counterweighted by the present invention;

[0066] Figure 3 is a three-dimensional structural schematic diagram of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention before extension;

[0067] Figure 4 is a front view of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention before extension;

[0068] Figure 5 The top view of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention before extension;

[0069] Figure 6a The structural schematic diagram of the circumferential extension bladder in a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention;

[0070] Figure 6b The structural schematic diagram of the counterweight bag in a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention;

[0071] Figure 7a The structural schematic diagram of the horizontal expansion bladder in a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention;

[0072] Figure 7b The structural schematic diagram of the vertical expansion bladder in a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention;

[0073] Figure 8 The three - dimensional structural schematic diagram of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention in Embodiment 1 after the auxiliary sinking counterweight structure and the anti - erosion structure are extended;

[0074] Figure 9 The front view of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention in Embodiment 1 after the auxiliary sinking counterweight structure and the anti - erosion structure are extended;

[0075] Figure 10 The three - dimensional structural schematic diagram of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention in Embodiment 2 after the auxiliary sinking counterweight structure and the anti - erosion structure are extended;

[0076] Figure 11 The front view of a cylindrical foundation with an auxiliary sinking counterweight structure provided by the present invention in Embodiment 2 after the auxiliary sinking counterweight structure and the anti - erosion structure are extended;

[0077] In the figure, 1 is the cylindrical foundation structure, 2 is the column, 3 is the transition section, 4 is the suction bucket, 5 is the suction bucket top;

[0078] 6 is the outer wall of the suction bucket, 7 is the horizontal expansion bladder, 8 is the vertical expansion bladder, 9 is the geotextile membrane, 10 is the circumferential extension bladder;

[0079] 11 is the counterweight bag, 12 is the counterweight support frame, 13 is the high - pressure water jet pipe, 14 is the inlet of the circumferential extension bladder, 15 is the outlet of the circumferential extension bladder;

[0080] 16 is the inlet of the counterweight belt, 17 is the outlet of the counterweight bag, 18 is the inlet of the horizontal expansion bladder, 19 is the outlet of the horizontal expansion bladder, and 20 is the inlet of the vertical expansion bladder;

[0081] 21 is the outlet of the vertical expansion bladder, and 22 is the annular expansion bladder. Detailed implementation manners

[0082] To make the technical means for implementing the present invention easier to understand, the following further details the present application with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the related application and do not limit the application. Additionally, it should be noted that for the sake of description, only parts related to the present application are shown in the drawings.

[0083] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and embodiments.

[0084] It should be noted that in the description of the present application, terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application.

[0085] In addition, it should be noted that in the description of the present application, unless otherwise clearly specified and limited, terms such as "installation" should be understood in a broad sense. For example, it can be fixedly installed or detachably installed.

[0086] For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0087] See Figures 1 to 11 , the present invention provides a cylindrical foundation with an auxiliary sinking counterweight structure, including a cylindrical foundation structure 1;

[0088] The cylindrical foundation structure 1 includes a column 2, a transition section 3, and a suction bucket 4;

[0089] At the top of the cylindrical suction bucket 4, a frustum-shaped transition section 3 is fixedly arranged;

[0090] At the top of the transition section 3, a vertically distributed column 2 is fixedly arranged;

[0091] Among them, the suction bucket 4 includes an annular suction bucket outer wall 6 with an open bottom;

[0092] At the top of the outer wall 6 of the suction cylinder, a circular suction cylinder top 5 is fixedly arranged.

[0093] Among them, on the outer wall around the outer wall 6 of the suction cylinder, a plurality of vertically distributed and hollow water jet high-pressure pipes 13 are arranged at equal intervals;

[0094] The bottom of the water jet high-pressure pipe 13 is flush with the bottom of the outer wall 6 of the suction cylinder;

[0095] The bottom of the water jet high-pressure pipe 13 is open;

[0096] Among them, around the outer wall in the radial direction of the column 2, a circumferentially extended bladder 10 is wrapped;

[0097] The bottom of the circumferentially extended bladder 10 is in contact with the top of the transition section 3;

[0098] Among them, at the central position of the top of the column 2, a counterweight support frame 12 is placed;

[0099] The counterweight support frame 12 includes a plurality of counterweight support rods 120 (not limited to Figure 3 the six shown)

[0100] The outer end of each counterweight support rod 120 (that is, the end on the side far from the central position of the top of the column 2) protrudes outward from the top of the column 2, and at least one counterweight bag 11 is respectively suspended;

[0101] It should be noted that the number of counterweight bags 11 suspended by all the counterweight support rods 120 is the same to ensure balanced counterweight.

[0102] Around the top in the radial direction of the suction cylinder top 5, a circumferential counterweight structure is arranged;

[0103] The circumferential counterweight structure is used to increase the counterweight around the top in the radial direction of the suction cylinder top 5.

[0104] In the present invention, it should be noted that the tower barrel generally refers to the upright section above the wind power foundation, which is a conventional upper structure and does not belong to the internal structure of the foundation. For the present invention, the column 2 is a part of the foundation structure connected to the tower barrel, and the two (that is, the column 2 and the tower barrel) are connected by a flange and bolts, and this connection method is a well-known connection method in the art and will not be elaborated here.

[0105] In the present invention, it should be noted that the cylindrical foundation structure 1 is a support structure with an open bottom entering the soil and the upper part exposed above the water surface. The column 2 is a structure connecting the upper structure of the foundation and the foundation structure; the transition section 3 is a transition structure for transmitting the upper load to the suction cylinder 4;

[0106] In the present invention, specifically, the suction cylinder 4 is a steel or concrete structure with an open bottom and a closed top and peripheral side walls.

[0107] It should be noted that the top 5 of the suction cylinder is the top cover structure of the suction cylinder 4;

[0108] The outer wall 6 of the suction cylinder is the outer structure on the radial periphery of the suction cylinder 4.

[0109] In the present invention, in terms of specific implementation, refer to Figure 3 、 Figure 4 and Figure 9 and Figure 10 , the weight structure around the top of the cylinder adopted in the present invention may specifically include: a plurality of vertical expansion bags 8 and a plurality of horizontal expansion bags 7 in the first embodiment;

[0110] The radial four peripheral edges at the top of the suction cylinder top 5 are connected to the bottoms of a plurality of vertical expansion bags 8 at equal intervals along the circumferential direction;

[0111] The radial four peripheral edges at the top of the suction cylinder top 5 are also respectively connected to the inner ends of a horizontal expansion bag 7 at positions corresponding to the outside of each vertical expansion bag 8;

[0112] Among them, any two adjacent vertical expansion bags 8 and any two adjacent horizontal expansion bags 7 are respectively connected by a geotextile membrane 9.

[0113] In the present invention, in terms of specific implementation, the bottom of each vertical expansion bag 8 is fixedly connected to the top edge of the suction cylinder top 5 through a splint;

[0114] The inner and outer sides of each vertical expansion bag 8 are adhesively bonded or sewn and woven with the geotextile membrane 9 to jointly form a circumferential closed structure.

[0115] In the present invention, in terms of specific implementation, the inner end of the horizontal expansion bag 7 is fixedly connected to the radial four peripheral edges at the top of the suction cylinder top 5 through a splint;

[0116] The upper and lower sides of the horizontal expansion bag 7 are adhesively bonded or sewn and woven with the geotextile membrane 9.

[0117] It should be noted that for the present invention, refer to Figure 8 As shown, the vertical expansion bag 8, the geotextile membrane 9 and the top of the suction cylinder top 5 jointly form a space 100 that is closed in the circumferential and bottom directions and open at the top. The vertical expansion bag 8 does not communicate with the inside of the horizontal expansion bag 7, and the two are independent of each other.

[0118] In terms of specific implementation, the geotextile membrane 9 is fixedly connected to the radial four peripheral edges of the suction cylinder top 5.

[0119] In terms of specific implementation, at the top of the inner end of each horizontal expansion bag 7, a horizontal expansion bag inlet 18 is provided as the feed inlet of the horizontal expansion bag 7;

[0120] At the center position of the outer end of each horizontal expansion bladder 7, a horizontal expansion bladder outlet 19 is provided as the discharge port of the horizontal expansion bladder 7.

[0121] Specifically, at the center position of the top of each vertical expansion bladder 8, a vertical expansion bladder inlet 20 is provided as the feed port;

[0122] At the outer side of the bottom of each vertical expansion bladder 8, a vertical expansion bladder outlet 21 is provided as the discharge port.

[0123] It should be noted that the horizontal expansion bladder 7 is a hollow structure made of soft materials such as rubber, cloth or plastic. When it is not filled inside, its structure is in a flattened state; materials such as gas, seawater, and sea sand can be filled inside it. When the filler enters its internal space, the horizontal expansion bladder 7 can extend along the horizontal direction and has a certain stiffness when tightened.

[0124] The vertical expansion bladder 8 has the same structure as the horizontal expansion bladder 7. It is a hollow structure made of soft materials such as rubber, cloth or plastic. When it is not filled inside, its structure is in a flattened state; gas can be filled inside it using an air compressor, seawater can be filled inside it using a water pump, or sea sand can be filled inside it using a sand pump. When the filler enters its internal space, the vertical expansion bladder 8 can extend vertically and has a certain stiffness when tightened.

[0125] The geotextile membrane 9 is a thin film structure. It is connected to the horizontal expansion bladder 7 and the vertical expansion bladder 8 and is connected to the side of the suction cylinder top 5. See Figure 3 As shown, when the horizontal expansion bladder 7 and the vertical expansion bladder 8 are not extended, the geotextile membrane 9 is in a folded state; see Figure 8 As shown, when the horizontal expansion bladder 7 and the vertical expansion bladder 8 are extended, the geotextile membrane 9 unfolds accordingly and forms a continuous whole together with the expansion bladders (i.e., the horizontal expansion bladder 7 and the vertical expansion bladder 8).

[0126] Among them, the geotextile membrane 9 is connected to the horizontal expansion bladder 7 and the vertical expansion bladder 8 respectively by gluing or sewing.

[0127] In the present invention, specifically, at the outer side of the top of the circumferential expansion bladder 10, a circumferential expansion bladder inlet 14 is opened as the feed port;

[0128] At the outer side of the bottom of the circumferential expansion bladder 10, a circumferential expansion bladder outlet 15 is opened as the discharge port.

[0129] It should be noted that the circumferential extension bladder 10 is a closed hollow bladder structure wrapped around the outer wall of the column 2 in the radial direction. Its top is provided with a circumferential extension bladder inlet 14, and its bottom is provided with a circumferential extension bladder outlet 15. Materials such as gas, seawater, and sea sand can be filled inside it. When filled with gas, the buoyancy and stability of the overall cylindrical foundation can be improved. When filled with seawater and / or sea sand, the counterweight of the cylindrical foundation can be increased.

[0130] It should be noted that for the present invention, the circumferential extension bladder 10 is closely attached to the outside of the column 2 and is connected or glued by hooks. The circumferential extension bladder 10 is in a deflated state initially. After being in place, gas can be filled inside it using an air compressor, or seawater can be filled inside it using a water pump, or materials such as sea sand can be filled inside it using a sand pump. When the filling material enters its internal space, the circumferential extension bladder 10 can extend circumferentially.

[0131] It should be noted that the counterweight support frame 12 is located at the top of the column 2 and can be horizontally telescoped. When it is necessary to add counterweight to the counterweight bag 11, the counterweight support rod 120 of the counterweight support frame 12 extends, and the counterweight bag 11 is hung on the outer end of the counterweight support rod 120 (the outer end of the counterweight support rod 120 has a hanging hole for connecting the hanging rope on the counterweight bag 11), and the weight increased by filling the counterweight bag 11 with sea sand and the like is transmitted to the column 2.

[0132] For the present invention, in order to avoid the mutual collision and influence between the counterweight bag 11 and the circumferential extension bladder 10 after they are both filled and expanded with the increase in volume, a horizontally telescoping counterweight support frame 12 is provided at the top of the column 2. When it is necessary to add counterweight to both at the same time, the counterweight support frame 12 extends horizontally.

[0133] Specifically, the telescoping structure of the counterweight support frame 12 is a conventional telescoping structure. For example, as shown in Figure 8 each counterweight support rod 120 in the counterweight support frame 12 includes a hollow support tube 121 and an insertion rod 122. The insertion rod 122 is inserted into the support tube 121. Therefore, the horizontal telescoping amount of the counterweight support frame 12 can be adjusted by adjusting the length of the insertion rod 122 inserted into the support tube 121.

[0134] In the present invention, specifically, the counterweight bag 11 is a hollow closed bag structure, and its top is provided with a counterweight bag inlet 16 as the feed inlet;

[0135] the bottom of the counterweight bag 11 is provided with a counterweight bag outlet 17 as the discharge outlet;

[0136] It should be noted that seawater or sea sand and other counterweight materials can be filled inside the counterweight bag 11 to temporarily increase the counterweight of the cylindrical foundation structure of the present invention.

[0137] In the present invention, in a specific implementation, the water jet high-pressure pipe 13 is pre-buried in the outer wall 6 of the suction cylinder.

[0138] It should be noted that the water jet high pressure pipe 13 is a high pressure pipe pre-buried in the outer wall 6 of the suction cylinder, and opens at the bottom of the water jet high pressure pipe 13. When the cylinder foundation is not well sunk into the soil, the soil at the lower end of the cylinder foundation can be flushed away by injecting high pressure water of a certain pressure into the pipe (i.e., the water jet high pressure pipe 13), thereby reducing the resistance at the lower end of the cylinder foundation; at the same time, the through path formed by the high pressure water rising along the cylinder wall (i.e., the outer wall 6 of the suction cylinder) can reduce the frictional resistance on the cylinder wall side, which is conducive to ensuring that the cylinder foundation sinks into place.

[0139] In a specific implementation, the tops of the multiple water jet high-pressure pipes 13 are open and connected to the same annular high-pressure water delivery pipe;

[0140] The high-pressure water delivery pipe is provided with a water inlet, which is connected to the water outlet of the high-pressure water pump located outside through a hollow connecting pipe;

[0141] Of course, the top openings of the multiple water jet high-pressure pipes 13 can also be directly connected to the water outlet of a high-pressure water pump located outside through a hollow connecting pipe.

[0142] In the present invention, the specific implementation is as follows: Figure 10 , Figure 11 As shown, the weight structure around the top of the cylinder used in the present invention may specifically include an annular telescopic bag 22 in the second embodiment;

[0143] The annular telescopic bag 22 is fixed to the radial edges of the top of the suction cylinder top 5;

[0144] The annular telescopic capsule 22 includes a plurality of vertical annular capsules 221 distributed vertically and a plurality of horizontal annular capsules 222 distributed horizontally;

[0145] Any two adjacent vertical annular capsules 221 are connected (have a connecting passage);

[0146] Any two adjacent horizontal annular capsules 222 are connected (have a connecting channel);

[0147] A horizontal annular capsule 222 located at the innermost side and a vertical annular capsule 221 located at the lowermost side are connected (having a connecting passage).

[0148] It should be noted that the annular telescopic bladder 22 is a hollow structure made of soft materials such as rubber, cloth or plastic. The annular telescopic bladder 22 includes a plurality of hollow annular bladders, which is a connecting structure in which a plurality of hollow annular bladders communicate vertically or circumferentially. Its interior can gradually expand as fillers such as gas, seawater, and sea sand enter, forming a continuous closed structure.

[0149] In order to construct the cylindrical foundation with the auxiliary sinking weight structure provided by the present invention, the present invention also provides a construction method for the cylindrical foundation with the auxiliary sinking weight structure, which specifically includes the following steps:

[0150] The first step is to pre-fabricate the columns 2, transition sections 3, and suction cylinders 4 outside the offshore wind farm (i.e., the construction site of the offshore wind turbine generator), such as onshore factories or other manufacturing sites such as wharves, and then assemble them into the cylindrical foundation structure 1.

[0151] Among them, the suction cylinder 4 includes an annular suction cylinder outer wall 6 with an open bottom.

[0152] At the top of the suction cylinder outer wall 6, a circular suction cylinder top 5 is fixedly arranged.

[0153] The second step is to connect each bladder structure (such as fabricated in a factory), including the horizontal telescopic bladder 7, the vertical telescopic bladder 8, and the circumferential extension bladder 10, to the cylindrical foundation structure 1. Among them, after the horizontal telescopic bladder 7 is connected to the geotextile membrane 9, it is placed on the outermost side of the top of the suction cylinder top 5 in the suction cylinder 4 to facilitate horizontal extension, and the geotextile membrane 9 is hermetically connected to the top of the suction cylinder top 5; after the vertical telescopic bladder 8 is circumferentially connected to the geotextile membrane 9, it is placed on the top of the suction cylinder top 5 to facilitate vertical extension; and the circumferential extension bladder 10 is arranged around the column in the cylindrical foundation structure 1; at the same time, a plurality of water jet high-pressure pipes 13 are also arranged on the outer periphery of the suction cylinder outer wall 6, and the corresponding high-pressure water delivery pipelines are connected.

[0154] The third step is to place a horizontally telescopic counterweight support frame 12 on the top of the column 2, and hang a preset number of counterweight bags 11 on the outer ends of each counterweight support rod 120 in the counterweight support frame 12.

[0155] The fourth step is to transport the cylindrical foundation structure 1 to the target sea area at the designated position of the offshore wind farm by barge dry transportation or wet tow floating transportation for preparation of installation.

[0156] The fifth step is for the cylindrical foundation structure 1 to first execute the self-weight sinking stage, and then execute the auxiliary counterweight sinking stage in the sixth step.

[0157] It should be noted that when the cylindrical foundation structure 1 is in place and ready for installation, its conventional earth-entering sinking process is divided into two stages: self-weight sinking and pressure difference sinking. In the first stage, after the self-weight sinking of the cylindrical foundation structure 1 is completed, the pressure difference sinking stage of the second stage is not entered here first, but the auxiliary counterweight sinking stage of the sixth step is first executed; then, the pressure difference sinking stage of the second stage is executed in the ninth step;

[0158] The sixth step is to execute the auxiliary counterweight sinking stage of the cylindrical foundation structure 1: add counterweight (such as water or sea sand, etc.) by filling each bag structure including the horizontal telescopic bag 7, the vertical telescopic bag 8 and the annular extension bag 10 and the counterweight bag 11.

[0159] In the present invention, the sixth step specifically includes the following two sub-steps:

[0160] The first sub-step is to fill the expansion bag and add auxiliary counterweights. First, inject seawater or sea sand into the horizontal expansion bag 7. At this time, the horizontal expansion bag 7 will extend horizontally with the geotextile membrane 9 connected to it, and fall under the action of its own weight. The horizontal expansion bag 7 contacts the seabed surface around the outer wall 6 of the suction tube. Secondly, the vertical expansion bag 8 is extended in the same way (that is, seawater or sea sand is also injected into the vertical expansion bag 8), so that a space 100 with an open top and closed bottom and surroundings is formed between the vertical expansion bag 8, the geotextile membrane 9, the suction tube top 5, the transition section 3, and the column 2 (see Figure 8 As shown), the space 100 is then filled with sea sand to increase the auxiliary weight of the basic structure; then, the annular extension bag outlet 15 at the bottom of the annular extension bag 10 is closed, and seawater or sea sand is injected into the annular extension bag inlet 14 to increase the weight;

[0161] In the second sub-step, the counterweight support frame 12 is extended horizontally, and the counterweight bag outlet 17 at the bottom of each counterweight bag 11 is closed, and the counterweight is increased by injecting seawater or sea sand into the counterweight belt inlet 16 at the top of each counterweight bag 11.

[0162] It should be noted that after implementing the first sub-step and the second sub-step, since each bag structure including the horizontal telescopic bag 7, the vertical telescopic bag 8 and the annular extension bag 10 and the counterweight bag 11 are filled with counterweight seawater or sea sand as counterweight, with the increase of additional auxiliary counterweight of the cylindrical foundation structure 1, the cylindrical foundation structure 1 will overcome a part of the resistance borne by the cylindrical foundation structure and continue to sink into the ground to a certain depth; compared with the conventional sinking method without counterweight, the addition of auxiliary counterweight will increase the depth of the first stage foundation's own weight into the ground.

[0163] In the present invention, the horizontal telescopic bag 7 and the vertical telescopic bag 8 are expandable structures that are hollow inside and can be filled with gas, liquid, and sea sand. After the filler enters the bag structure, a support structure with a certain rigidity is formed, and the geotextile membrane 9 connected thereto can be unfolded together to form a shape structure in a designed working state. An air compressor can be used to fill gas inside, or a water pump can be used to fill seawater inside, or a sand pump can be used to fill sea sand and other materials inside.

[0164] Among them, the annular extension bag 10 is an expandable structure that is hollow inside and can be filled with liquid or sea sand. It is mainly considered to increase the counterweight weight during the sinking stage of the foundation structure. A water pump can be used to fill seawater inside it, or a sand pump can be used to fill sea sand and other materials inside it.

[0165] Step 7: Execute the pressure difference sinking stage of the cylindrical foundation structure 1: In the target sea area of the designated position of the offshore wind farm, adopt the existing pressure difference sinking method to continue to sink the cylindrical foundation structure 1 to the seabed, wherein the overall height of the cylindrical foundation structure 1 is higher than the water depth of the target sea area;

[0166] It should be noted that after the fifth step of the cylindrical foundation structure 1 sinking under its own weight and the sixth step of the auxiliary counterweight sinking stage are completed, the second stage of pressure difference sinking begins; at this time, since the horizontal telescopic bag 7 is extended with the geotextile membrane 9 after filling and falls under the action of its own weight, it will contact the seabed surface around the outer wall 6 of the suction cylinder, and a certain enclosed space is formed between the three, so that when the pressure difference sinking is carried out, the original infiltration path along the outer wall 6 of the suction cylinder (i.e., the cylinder wall) is greatly extended, and at the same time, it has a certain protective effect on the surface soil of the seabed covered by the geotextile membrane 9, and plays a role in preventing infiltration damage, thereby increasing the internal and external available pressure difference value during the sinking process.

[0167] It should also be noted that the pressure difference sinking method (i.e. negative pressure sinking method) refers to the use of a pump to extract the air and water inside the suction cylinder 4 that have not entered the seabed surface soil space, thereby forming a negative pressure space lower than the external air pressure in the space. The internal and external pressure difference forms a driving force, thereby causing the foundation to sink, reducing the auxiliary sinking method. The negative pressure sinking method is a well-known technology that is mature in the existing technology and will not be repeated here.

[0168] In the present invention, in specific implementation, after the seventh step, the following steps may also be included:

[0169] The eighth step is water jet breaking the ground to assist the sinking operation: for the water jet high-pressure pipe 13 pre-buried in the outer wall 6 of the suction cylinder, high-pressure water is injected into the water jet high-pressure pipe 13 to scatter the soil layer below the bottom of the cylindrical foundation structure 1, which is beneficial to reduce the resistance of the soil layer, and then the sinking construction can continue, ensuring that the cylindrical foundation structure 1 is sunk to the designed depth.

[0170] It should be noted that, under normal circumstances, the cylindrical foundation structure 1 can be sunk to the designed depth by using the self-weight of the cylindrical foundation structure 1, the auxiliary counterweight in the present invention, and differential pressure sinking. However, if a relatively hard local hard soil layer is encountered during sinking and construction cannot continue through counterweight and differential pressure, the high-pressure water pipe 13 of the water jet buried on the outer wall 6 of the suction cylinder can be activated. By injecting high-pressure water into the high-pressure water pipe 13 of the water jet, the soil layer under the bottom of the cylindrical foundation structure 1 can be broken up to reduce the soil layer resistance, and then the sinking construction can continue, ensuring that the cylindrical foundation structure 1 can be sunk to the designed depth.

[0171] In the present invention, specifically, after the eighth step, the following steps may further be included:

[0172] The ninth step, recovering the bladder structure: disassembling and recovering the vertical telescopic bladder 8, the circumferential extension bladder 10, the counterweight bag 11, and the counterweight support frame 12.

[0173] It should be noted that after the cylindrical foundation structure 1 is sunk to the designed depth by using one or more combined methods such as the self-weight of the cylindrical foundation structure 1, auxiliary counterweight, differential pressure sinking, and water jet breaking soil for auxiliary sinking, the sand or water inside the bladder structure itself and inside the surrounding cabin can be discharged through reverse operation; at this time, the horizontal telescopic bladder 7 and the geotextile membrane 9 are closely attached to the seabed and will continue to be used as the anti-scouring measures for the cylindrical foundation structure 1 during the operation period and will not be recovered after the sinking construction is completed. The remaining vertical telescopic bladder 8, circumferential extension bladder 10, counterweight bag 11, counterweight support frame 12, etc. will be recovered and reused.

[0174] In the present invention, it should be noted that for the cylindrical foundation provided by the present invention, after the vertical telescopic bladder 8, the circumferential extension bladder 10, the counterweight bag 11, and the counterweight support frame 12 are disassembled and recovered, the column 2 of the present invention, as a part of the foundation structure connected to the tower barrel, can be connected to the tower barrel through a flange and bolts, and the connection method is a well-known connection method in the art and will not be elaborated herein.

[0175] It should be noted that for the present invention, the above-provided structural system and supporting construction method of the present invention are not limited to the above-mentioned offshore wind turbine generators. Similarly, it is also applicable to other energy platforms.

[0176] In the present invention, referring to Figure 10 、 Figure 11 As shown, for the anti-scouring structure composed of the horizontal telescopic bladder 7 and the geotextile membrane 9, and the auxiliary counterweight hoop structure composed of the vertical telescopic bladder 8 and the geotextile membrane 9, it can be replaced by a continuous annular telescopic bladder 22, thus saving the multi-body connection of the geotextile membrane 9 and the bladder structure. It can be used as an alternative solution. At that time, according to the actual situation, a suitable counterweight extension structure can be selected.

[0177] Based on the above technical solutions, for the present invention, in order to avoid the problem that the cylindrical foundation cannot be sunk to the designed depth in complex geological conditions and to avoid the technical problems mentioned in the background art, the present invention temporarily weights the cylindrical foundation structure by using materials such as sand and water that can be conveniently obtained at the offshore wind farm site, thereby increasing the depth of the cylindrical foundation sinking into the soil by its own weight in the first stage. This is an effective technical measure to assist the sinking of the cylindrical foundation; in addition, during the differential pressure sinking in the second stage of the present invention, in order to further avoid the seepage failure of the soil around the cylinder wall, the erosion protection membrane is set in advance, thereby increasing the soil seepage path under the differential pressure between the inside and outside of the cylinder, improving the applicable differential pressure and avoiding seepage failure, and ensuring the safety of the entire sinking and installation stage.

[0178] Compared with the prior art, the cylindrical foundation with an auxiliary sinking weight structure and its construction method provided by the present invention have the following beneficial effects:

[0179] 1. The present invention makes full use of the convenience and recyclability of the fillable bladder structure. Without increasing the transportation capacity of the installation ship, it makes full use of raw materials such as seawater and sea sand that are relatively easy to obtain during the construction of the offshore wind farm as filling materials, and can quickly, pollution-free and economically achieve the weight loading during the foundation sinking process.

[0180] 2. The combined anti-erosion structure of the fillable bladder structure and the geotextile membrane adopted by the present invention not only plays an anti-erosion role in advance, but also increases the seepage path inside and outside the cylinder during the sinking process, improves the available internal and external pressure differences, and avoids the occurrence of seepage failure of the soil around the cylindrical foundation during the sinking process.

[0181] 3. The present invention solves the problem that the cylindrical foundation cannot be sunk to the designed depth in complex geological conditions by the most economical and environmentally friendly method.

[0182] In summary, compared with the prior art, the cylindrical foundation with an auxiliary sinking weight structure and its construction method provided by the present invention are scientifically designed. By arranging bladder, bag and membrane structures around the cylindrical foundation, and by increasing the weight and the seepage path, it assists the cylindrical foundation to sink and be in place, and can effectively solve the problem that the cylindrical foundation cannot be sunk to the designed depth in complex geological conditions, which has great practical significance.

[0183] The technical solution of the present invention is based on the principle of temporarily increasing the structural weight and improving the seepage path, and fully considers the convenience, economy of the available weight materials at sea and the early utilization of the erosion protection membrane. By filling sand or water into the recyclable bladder and bag to increase the weight, it overcomes the sinking resistance of the cylindrical foundation; and uses the self-expandable erosion protection membrane to advance the erosion operation to the sinking stage for construction, which can not only assist the sinking of the cylindrical foundation, but also be used as the erosion protection measure for the cylindrical foundation in the later stage.

[0184] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cylindrical foundation with an auxiliary sinking counterweight structure, characterized in that Comprising a cylindrical foundation structure (1); The cylindrical foundation structure (1) includes a column (2), a transition section (3) and a suction bucket (4); A frustum-shaped transition section (3) is fixedly arranged at the top of the cylindrical suction bucket (4); A vertically distributed column (2) is fixedly arranged at the top of the transition section (3); The suction bucket (4) includes an annular suction bucket outer wall (6) with an open bottom; A circular suction bucket top (5) is fixedly arranged at the top of the suction bucket outer wall (6); A plurality of vertically distributed and hollow water jet high-pressure pipes (13) are arranged at equal intervals on the outer periphery of the suction bucket outer wall (6); The bottom of the water jet high-pressure pipe (13) is flush with the bottom of the suction bucket outer wall (6); The bottom of the water jet high-pressure pipe (13) is open; Wherein, a circumferentially extended bladder (10) is wrapped around the outer periphery of the column (2) in the radial direction; A circumferential counterweight structure is arranged around the top of the suction bucket top (5) in the radial direction; The circumferential counterweight structure is used to increase the counterweight around the top of the suction bucket top (5) in the radial direction; The circumferential counterweight structure includes a plurality of vertically telescopic bladders (8) and a plurality of horizontally telescopic bladders (7); The bottoms of a plurality of vertically telescopic bladders (8) are connected at equal intervals along the circumferential direction to the outer periphery of the top of the suction bucket top (5); The inner ends of a plurality of horizontally telescopic bladders (7) are respectively connected to the outer periphery of the top of the suction bucket top (5) at positions corresponding to the outside of each vertically telescopic bladder (8); Wherein, any two adjacent vertically telescopic bladders (8) and any two adjacent horizontally telescopic bladders (7) are respectively connected by a geotextile membrane (9); A horizontal telescopic bladder inlet (18) is arranged at the top of the inner end of each horizontal telescopic bladder (7) as the feed inlet of the horizontal telescopic bladder (7); A horizontal telescopic bladder outlet (19) is arranged at the center of the outer end of each horizontal telescopic bladder (7) as the discharge outlet of the horizontal telescopic bladder (7); Wherein, a vertical telescopic bladder inlet (20) is arranged at the center of the top of each vertical telescopic bladder (8); A vertical telescopic bladder outlet (21) is arranged at the outside of the bottom of each vertical telescopic bladder (8); A circumferential extended bladder inlet (14) is opened at the outside of the top of the circumferentially extended bladder (10); A circumferential extended bladder outlet (15) is opened at the outside of the bottom of the circumferentially extended bladder (10); The circumferentially extended bladder (10) is a closed and hollow bladder structure, which is used to extend circumferentially when the filler enters its internal space, and is used to increase the buoyancy of the cylindrical foundation or increase the counterweight of the cylindrical foundation; The bottom of the circumferentially extended bladder (10) is in contact with the top of the transition section (3); Wherein, a counterweight support frame (12) is placed at the center of the top of the column (2); The counterweight support frame (12) includes a plurality of horizontally telescopic counterweight support rods (120) distributed at equal intervals along the circumferential direction; The outer end of each counterweight support rod (120) protrudes outward from the top of the column (2), and at least one counterweight bag (11) is respectively suspended; The counterweight bag (11) is a hollow and closed bag structure, and a counterweight bag inlet (16) is arranged at its top; A counterweight bag outlet (17) is arranged at the bottom of the counterweight bag (11); Each counterweight support rod (120) includes a hollow support tube (121) and an insertion rod (122), and the insertion rod (122) is inserted into the support tube (121); A counterweight support frame (12) is used to horizontally extend when the circumferential extension bladder (10) and the counterweight bag (11) need to be counterweighted, so as to avoid the mutual collision between the counterweight bag (11) and the circumferential extension bladder (10) after they are simultaneously filled and opened, and the volume expands and increases.

2. The cylindrical foundation with an auxiliary sinking counterweight structure according to claim 1, characterized in that, The cylindrical foundation structure (1) is a support structure with an open bottom for entering the soil and an upper part exposed above the water surface.

3. The cylindrical foundation with an auxiliary sinking counterweight structure according to claim 1, characterized in that, The suction caisson (4) is a steel or concrete structure with a closed top and surrounding side walls.

4. The cylindrical foundation with an auxiliary sinking counterweight structure as described in claim 1, wherein The geotextile membrane (9) is fixedly connected to the radial peripheral edges of the top of the suction caisson (5); The inner and outer sides of each vertical expansion bladder (8) are adhesively bonded or sewn to the geotextile membrane (9) to jointly form a circumferential airtight structure; The upper and lower sides of the horizontal expansion bladder (7) are adhesively bonded or sewn to the geotextile membrane (9); The vertical expansion bladder (8), the geotextile membrane (9) and the top of the suction caisson (5) jointly form a space (100) that is circumferentially and bottom airtight and top open.

5. The cylindrical foundation with an auxiliary sinking counterweight structure according to claim 1, characterized in that, The counterweight structure around the top of the cylinder includes an annular expansion bladder (22); The annular expansion bladder (22) is fixedly connected to the radial peripheral edges of the top of the suction caisson top (5); The annular expansion bladder (22) includes a plurality of vertically distributed vertical annular bladders (221) and a plurality of horizontally distributed horizontal annular bladders (222); Any two adjacent vertical annular bladders (221) are connected to each other; Any two adjacent horizontal annular bladders (222) are connected to each other; The innermost horizontal annular bladder (222) and the lowermost vertical annular bladder (221) are connected to each other.

6. A construction method of a cylindrical foundation with an auxiliary sinking counterweight structure as described in any one of claims 1 to 5, characterized in that, It includes the following steps: The first step is to pre-fabricate the columns (2), transition sections (3), and suction caissons (4) in an offshore wind farm, and then assemble them into a cylindrical foundation structure (1); Among them, the suction caisson (4) includes an annular suction caisson outer wall (6) with an open bottom; A circular suction caisson top (5) is fixedly arranged at the top of the suction caisson outer wall (6); The second step is to connect each bladder structure including the horizontal expansion bladder (7), the vertical expansion bladder (8) and the circumferential extension bladder (10) pre-fabricated to the cylindrical foundation structure (1). Among them, after the horizontal expansion bladder (7) is connected to the geotextile membrane (9), it is placed at the outermost edge of the top of the suction caisson top (5) in the suction caisson (4) to facilitate horizontal extension, and the geotextile membrane (9) is hermetically connected to the top of the suction caisson top (5); after the vertical expansion bladder (8) is circumferentially connected to the geotextile membrane (9), it is placed on the top of the suction caisson top (5) to facilitate vertical extension; and the circumferential extension bladder (10) is arranged around the columns in the cylindrical foundation structure (1); at the same time, a plurality of water jet high-pressure pipes (13) are also arranged on the outer sides of the four sides of the suction caisson outer wall (6), and the corresponding high-pressure water delivery pipelines are connected; The third step is to place a horizontally retractable counterweight support frame (12) on the top of the column (2), and hang a preset number of counterweight bags (11) on the outer end of each counterweight support rod (120) in the counterweight support frame (12); Step 4: transport the cylindrical foundation structure (1) to the target sea area of the designated position of the offshore wind farm by barge dry transport or wet towing and floating transport, and prepare for installation; Step 5: For the cylindrical foundation structure (1), firstly perform the self-weight sinking stage, and then perform the auxiliary counterweight sinking stage of Step 6; The sixth step is to perform the auxiliary weight sinking stage of the cylindrical foundation structure (1): adding weight by filling each bag structure including the horizontal telescopic bag (7), the vertical telescopic bag (8) and the annular extension bag (10) and the weight bag (11), wherein the weight includes water and / or sea sand; The seventh step is to execute the pressure difference sinking stage of the cylindrical foundation structure (1): in the target sea area of the designated machine position of the offshore wind farm, the existing pressure difference sinking method is adopted to continue to sink the cylindrical foundation structure (1) to the seabed, wherein the overall height of the cylindrical foundation structure (1) is higher than the water depth of the target sea area.

7. The construction method of the cylindrical foundation with an auxiliary sinking counterweight structure according to claim 6, characterized in that, After step 7, the following steps are included: Step 8: Water jet soil breaking and auxiliary sinking operation: For the water jet high-pressure pipe (13) pre-buried in the outer wall (6) of the suction cylinder, high-pressure water is injected into the water jet high-pressure pipe (13) to scatter the soil layer below the bottom of the cylindrical foundation structure (1).

8. The construction method of the cylindrical foundation with an auxiliary sinking counterweight structure as described in claim 7, characterized in that, After step 8, the following steps are included: The ninth step is to recover the capsule structure: disassemble and recover the vertical telescopic capsule (8), the annular extension capsule (10), the counterweight bag (11) and the counterweight support frame (12).

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