1. A suction bucket foundation structure assisting sinking by using a high-frequency vibration device comprises a suction bucket foundation and is characterized in that the suction bucket foundation is of a bucket-shaped structure consisting of a steel bucket wall and a top cover, and a cabin dividing plate is arranged in a bucket body to divide the suction bucket foundation into a plurality of cabins for negative pressure sinking and leveling; the top of each cabin is provided with a water-gas valve to control the negative pressure extraction condition; the suction bucket basis top cap upper portion sets up guide post and tapered guide structure, each cabin top sets up the aqueous vapor valve and all is in tapered guide structure inboard, the top cap sets up the annular contact support top surface that supplies high-frequency vibration device to place in tapered guide structure's periphery.

2. The foundation structure of a suction bucket assisted by a high frequency vibration device, as set forth in claim 1, wherein the high frequency vibration device is provided at an upper portion thereof with a hanging ring, and the high frequency vibration device is suspensibly placed on the top surface of the circular contact support of the top cover.

3. The suction bucket foundation structure for assisting sinking by means of the high frequency vibration device as set forth in claim 1, wherein the high frequency vibration device is a ring-shaped vibration device comprising a ring-shaped body having a bottom portion capable of coming into supporting contact with the top cover at a ring-shaped contact top surface of the tapered guide periphery, and a plurality of high frequency vibration units are uniformly arranged in the ring-shaped body.

4. The suction bucket foundation structure for assisting sinking by using a high frequency vibration device as claimed in claim 1, wherein a vibrator is provided at an upper portion of the high frequency vibration unit, a vibration mass block is provided at a bottom portion for transmitting vibration waves to the top cover through the ring-shaped body, the vibrator is provided therein with a motor and an eccentric wheel driven by the motor, the vibration mass block is connected to a vibration connection rod capable of performing a lifting motion, the vibration connection rod is connected to the eccentric wheel through a rotation connection rod and capable of performing a high frequency lifting motion by the driving of the rotating eccentric wheel, and the vibration connection rod is externally fitted with a return spring.

5. The foundation structure of a suction bucket assisted by a high frequency vibration device for sinking as claimed in claim 1, wherein the high frequency vibration unit is provided with a plurality of vibration masses, which are connected by mass connecting rods.

6. The suction bucket infrastructure for assisting sinking using a high frequency vibratory device of claim 1, further comprising: the guide post is arranged at the center of the top cover, a water and gas pipeline is arranged in the guide post, the barrel wall and the top cover are sealed, the upper part of the water and gas pipeline is connected with a vacuum pump on an installation ship, and negative pressure in the suction barrel foundation is extracted through the water and gas pipeline.

7. The suction bucket infrastructure for assisting sinking using a high frequency vibratory device of claim 1, further comprising: the jacket insert tip is inserted into the guide post at the top of the suction bucket foundation, the guide post is fixed by the inverted bracket, underwater grouting treatment is performed between the guide post and the inverted bracket, and the action strength between the guide post and the inverted bracket is enhanced.

8. A construction method of a foundation structure of a suction bucket sinking with the aid of a high-frequency vibration device, characterized in that the foundation structure of the suction bucket according to claim 1 including a cone-shaped guide structure and a jacket are prefabricated on land; the construction method comprises the following steps:

(1) accurately determining the sinking position of the suction bucket foundation through a positioning instrument, fixing a steel wire rope on the suction bucket foundation, hoisting the structure by using a floating crane and gradually putting the structure into water until the suction bucket foundation falls on the underwater seabed mud surface;

(2) under the action of self-weight, a suction bucket foundation sinks below a mud surface, a closed cavity is formed in the suction bucket, then a high-frequency vibration device is hung on the annular contact supporting top surface of the top of the suction bucket foundation under the guide of a conical guide structure, then the interior of the suction bucket is sucked to form negative pressure, the suction bucket is slowly pressed into foundation soil under the action of the negative pressure, and meanwhile, the vibration intensity and the frequency of the high-frequency vibration device are adjusted until the top cover of the suction bucket foundation reaches a specified depth;

(3) the high-frequency vibration device is adjusted away from the installed suction bucket foundation by using the floating crane on the installation ship and is repeatedly used for installing other suction bucket foundations;

(4) installing the rest suction bucket foundations according to the methods from (2) to (4);

(5) and placing the jacket in a guide column at the top of the suction bucket foundation by using the floating crane, performing underwater grouting between the jacket and the suction bucket foundation, and finishing the installation of the offshore electric platform supporting structure.

9. The construction method according to claim 8, wherein: the high-frequency vibration device transmits vibration to the top cover and then to the barrel wall and the subdivision plate by controlling the mass block and the annular main body, so that the aim of vibration resistance reduction is fulfilled.

10. The construction method according to claim 8, wherein: the top of the suction bucket foundation cabin is provided with a level meter which monitors the sinking process in real time, and the top of the suction bucket foundation is kept horizontal by adjusting the vibration frequency and amplitude output of each vibration unit of the water vapor extraction and frame skipping high-frequency vibration device of different cabins in the bucket.

Background

In recent years, offshore wind power resources have been developed from offshore to deep open sea. In order to ensure effective transmission of electric energy, an offshore electric platform is usually arranged in an offshore wind farm, the voltage of the electric energy generated in the wind farm is raised to 110kV or 220kV, and then the electric energy is transmitted to a onshore substation through a submarine high-voltage cable. As an electric energy collection center of an offshore wind farm, an offshore large-scale electric platform is a key facility for power transmission and transformation and is also a key for success or failure of the whole offshore wind farm. The traditional offshore electric platform supporting structure usually adopts a combination mode of a pile foundation and a jacket, but has the problems of high construction cost of the pile foundation, short construction window period, difficult pile forming of seabed of a shallow covering layer and the like. The suction bucket foundation and jacket combined structure is a new supporting form of an offshore electrical platform. The suction bucket is commonly used as the structure basis such as breakwater, pier, artificial island, offshore platform, and its last top is sealed, and the lower extreme is uncovered, and the key feature has: 1) the sinking and positioning of the suction bucket foundation are mainly realized by the dead weight and the negative pressure; 2) the suction bucket foundation is supported by the interaction between shallow soil and the foundation, and is different from a pile foundation which mainly depends on the interaction between a pile wall, a pile end and deep soil; 3) the suction bucket foundation can reduce the steel consumption, reduce the cost, shorten the offshore operation time and the like. However, in practical engineering, the suction bucket foundation sinks in place, the bucket soil interaction is complex, the sinking resistance of the suction bucket is large, and the suction bucket foundation cannot sink to a specified depth depending on the self weight of the suction bucket foundation and negative pressure. The projects and tests at home and abroad prove that the reason for the failure of most suction bucket foundations is that the suction bucket foundations are insufficient in bearing capacity due to the problems of inclination or insufficient sinking depth and the like in sinking. Therefore, a new suction bucket sinking structure and method are needed to be provided, so that the suction bucket sinking structure and method can be guaranteed to be installed and sunk in place to meet the design and precision requirements.

Disclosure of Invention

The invention aims to solve the problems of large sinking resistance, incapability of ensuring levelness and the like in the process of sinking and positioning a suction bucket foundation, provides a suction bucket foundation structure and a construction method utilizing a high-frequency vibration device to assist sinking, combines the conventional sinking mode of the suction bucket foundation and the auxiliary sinking of the high-frequency vibration device, exerts the characteristics of self weight combination of negative pressure sinking and the advantages of high-frequency vibration resistance reduction of the suction bucket, effectively reduces the sinking resistance and improves the sinking precision.

The invention utilizes a high-frequency vibration device to assist sinking, and the principle of the invention is that a high-acceleration vibration machine is used for controlling a connecting rod and a mass block, vertical vibration generated by machinery is transmitted to a suction bucket, so that the soil body structure around the bucket is weakened due to vibration, the frictional resistance between the bucket side and the soil body is reduced, and simultaneously, water and gas in the bucket are extracted to generate external pressure, so that the suction bucket is sunk into the soil by a specified depth. It should be noted that, in the process of the high-frequency vibration assisted negative pressure sinking, the resistance of the soil body to the barrel-shaped foundation is reduced, and along with the completion of the barrel-shaped foundation sinking, the high-frequency vibration makes the soil body in the barrel compact, which is helpful for improving the bearing capacity of the foundation.

According to a first aspect of the invention, there is provided a suction bucket foundation structure for assisting sinking using a high frequency vibration device.

Therefore, the invention adopts the following technical scheme: a suction bucket foundation structure assisting sinking by using a high-frequency vibration device comprises a suction bucket foundation and is characterized in that the suction bucket foundation is of a bucket-shaped structure consisting of a steel bucket wall and a top cover, and a cabin dividing plate is arranged in a bucket body to divide the suction bucket foundation into a plurality of cabins for negative pressure sinking and leveling; the top of each cabin is provided with a water-gas valve to control the negative pressure extraction condition; the suction bucket basis top cap upper portion sets up guide post and tapered guide structure, each cabin top sets up the aqueous vapor valve and all is in tapered guide structure inboard, the top cap sets up the annular contact support top surface that supplies high-frequency vibration device to place in tapered guide structure's periphery.

Further, a hanging ring is arranged on the upper portion of the high-frequency vibration device, and the high-frequency vibration device can be placed on the annular contact supporting top surface of the top cover in a hanging mode.

Further, the high-frequency vibration device is an annular vibration device and comprises an annular main body, the bottom of the annular main body can be in supporting contact with the top cover on the annular contact top surface of the periphery of the conical guide, and a plurality of high-frequency vibration units are uniformly arranged in the annular main body.

Furthermore, the upper part of the high-frequency vibration unit is provided with a vibrator, a vibration mass block is arranged at the bottom and used for transmitting vibration waves to the top cover through the annular main body, a motor and an eccentric wheel driven by the motor are arranged in the vibrator, the vibration mass block is connected with a vibration connecting rod capable of doing lifting motion, the vibration connecting rod is connected with the eccentric wheel through a rotating connecting rod and can do high-frequency lifting motion under the driving of the rotating eccentric wheel, and a reset spring is sleeved outside the vibration connecting rod.

Furthermore, the high-frequency vibration unit is provided with a plurality of vibration mass blocks, and the vibration mass blocks are connected through mass block connecting rods.

Furthermore, the guide post is arranged at the center of the top cover, a water and gas pipeline is arranged in the guide post, the barrel wall and the top cover are sealed, the upper part of the water and gas pipeline is connected with a vacuum pump on an installation ship, and negative pressure in the suction barrel foundation is extracted through the water and gas pipeline.

Furthermore, the jacket inserting tip is inserted into the guide post at the top of the suction bucket foundation, the guide post is fixed by the inverted bracket, underwater grouting treatment is carried out between the jacket inserting tip and the guide post, and the action strength between the jacket inserting tip and the guide post is enhanced.

According to a second aspect of the present invention, there is provided a construction method of a foundation structure of a sinking suction bucket using a high frequency vibration device for assisting the sinking suction bucket.

Therefore, the invention adopts the following technical scheme:

a construction method for assisting a sinking suction barrel foundation structure by using a high-frequency vibration device is characterized in that the suction barrel foundation structure comprising a conical guide structure and a jacket are prefabricated on land; the construction method comprises the following steps:

(1) accurately determining the sinking position of the suction bucket foundation through a positioning instrument, fixing a steel wire rope on the suction bucket foundation, hoisting the structure by using a floating crane and gradually putting the structure into water until the suction bucket foundation falls on the underwater seabed mud surface;

(2) under the action of self-weight, a suction bucket foundation sinks below a mud surface, a closed cavity is formed in the suction bucket, then a high-frequency vibration device is hung on the annular contact supporting top surface of the top of the suction bucket foundation under the guide of a conical guide structure, then the interior of the suction bucket is sucked to form negative pressure, the suction bucket is slowly pressed into foundation soil under the action of the negative pressure, and meanwhile, the vibration intensity and the frequency of the high-frequency vibration device are adjusted until the top cover of the suction bucket foundation reaches a specified depth;

(3) the high-frequency vibration device is adjusted away from the installed suction bucket foundation by using the floating crane on the installation ship and is repeatedly used for installing other suction bucket foundations;

(4) installing the rest suction bucket foundations according to the methods from (2) to (4);

(5) and placing the jacket in a guide column at the top of the suction bucket foundation by using the floating crane, performing underwater grouting between the jacket and the suction bucket foundation, and finishing the installation of the offshore electric platform supporting structure.

After the suction bucket foundation sinks due to self weight, the foundation and the soil body form a sealed cabin, then water in the bucket is pumped by a vacuum pump to be pumped, and pressure difference is formed between the upper surface and the lower surface of the top cover of the suction bucket foundation; the high-frequency vibration device is placed above the top cover of the suction bucket foundation along the conical guide of the top cover, the penetration resistance is reduced by controlling the vibration intensity and frequency of the high-frequency vibration device, the soil squeezing effect is reduced, the sinking speed and angle of the suction bucket foundation are effectively controlled, the levelness of the suction bucket foundation is controlled within a design range, and the suction bucket foundation and the guide pipe frame form an integral structure by means of guide brackets, underwater grouting and other measures.

The high-frequency vibration device transmits vibration to the top cover and then to the barrel wall and the subdivision plate by controlling the mass block and the annular main body, so that the aim of vibration resistance reduction is fulfilled.

Furthermore, a level meter is arranged at the top of the suction bucket foundation cabin, the sinking process is monitored in real time, and the top of the suction bucket foundation is kept horizontal by adjusting the water vapor extraction of different cabins in the bucket and adjusting the vibration frequency and amplitude output of each vibration unit of the high-frequency vibration device.

Compared with the prior art, the invention has the following beneficial effects:

(1) the penetration resistance of the suction bucket foundation is effectively reduced, the whole process is also supported to be monitored in real time, and the penetration precision of the suction bucket foundation is improved through negative pressure and vibration auxiliary control; (2) the characteristics of high construction speed of the suction bucket foundation self weight and negative pressure sinking are fully utilized, the construction efficiency is effectively improved, and the construction cost is reduced; (3) the foundation structure is suitable for coastal soft soil, sea areas with complex geological conditions and complex ocean conditions; (4) the high-frequency vibration device can be repeatedly used; (5) the foundation structure is convenient to dismantle, the suction bucket, the jacket and the like can be recovered, and no marine environmental pollution risk exists. Therefore, the invention has simple structure, convenient construction and operation, material and construction period saving, effective cost reduction and good popularization and application prospect.

Drawings

Figure 1 is a three dimensional view of a suction bucket foundation embodiment of the present invention.

Figure 2 is a top view of a basic embodiment of the suction bucket of the present invention.

Figure 3 is a cross-sectional view of a suction bucket foundation embodiment of the present invention.

FIG. 4 is a schematic view of the high frequency vibration device of the present invention.

FIG. 5 is a schematic elevation view of the present invention as applied to an offshore electrical platform.

Detailed Description

In order to further explain the contents, characteristics and effects of the present invention, the following detailed description of the present invention is made with reference to the accompanying drawings:

(1) as shown in fig. 1 to 5, in the present embodiment, four suction bucket foundations and a jacket are provided as a supporting structure of an offshore electrical platform, the diameter of each suction bucket is 10m, the height of each suction bucket is 10m, the thickness of each base bucket wall is 1 mm, the thickness of each base bucket top cover is 2 mm, a plurality of bay boards 3 are provided inside a bucket body, and reinforcing plates or reinforcing ribs are further provided inside the bucket body to prevent buckling of a steel plate caused by negative pressure. The plate 3 of subdivision is 35mm thick, sets up 7 cabins in the bucket and is used for basic negative pressure leveling, and every cabin top sets up cabin aqueous vapor valve 8. The top cover 2 of the base barrel is welded with a conical guide 6 for installing an annular high-frequency vibration device in place, the conical guide 6 takes a central guide post 7 at the top of the ejector rod as the installation and in-place guide, each water-gas valve 8 is arranged at the inner side of the conical guide 6, and the top cover is provided with an annular contact supporting top surface 20 for placing the high-frequency vibration device at the periphery of the conical guide structure 6.

The ring-shaped vibrating device comprises a ring-shaped main body 50, the bottom of the ring-shaped main body 50 can be in supporting contact with the top surface of the ring-shaped contact support of the top cover 2 at the periphery of the cone-shaped guide 6, four groups of high-frequency vibration units 5 are uniformly arranged in the annular main body, a vibrator 14 is arranged at the upper part of each high-frequency vibration unit 5, a vibration mass block 12 is arranged at the bottom, for transmitting vibration waves to the top cover 2 through the ring-shaped body 50, a motor and an eccentric wheel driven by the motor are provided in the vibrator 14, the vibration mass 12 is connected with a vibration connection rod 16 capable of making a lifting motion, the vibration connection rod 16 is connected with the eccentric wheel through a rotation connection rod, the high-frequency vibration unit 5 is provided with a lifting guide structure of a vibration connecting rod 16 at the upper part, the vibration connecting rod 16 is sleeved with a return spring 13, if a plurality of vibrating masses 12 are provided, the vibrating masses 12 are connected to each other by mass connecting rods 17. The annular vibration device is placed on an annular contact part 20 of the base top cover 2 along the conical guide 6 and is concentric with the base top cover 2 and the base barrel wall 1 (barrel body), and the high-frequency vibration unit 5 generates high-frequency vibration through the synergistic action of the vibrator 14, the vibration mass block 12, the connecting spring 13, the vibration connecting rod 16 and the mass block connecting rod 17 to assist the suction barrel foundation to sink and be in place. The vibration frequency of the dither device is determined by the speed of the motor and the speed ratio of the motor transmission.

(2) As shown in fig. 1 and 2, the foundation barrel wall 1, the foundation roof 2, the foundation subdivision plate 3, the roof taper guide 6, the cabin water-gas valve 8 and other barrel foundation structures can be prefabricated and assembled on the land, and the suction barrel foundation, the annular vibration device and the jacket 18 are transported to the designated position of the offshore wind farm by the offshore installation vessel.

(3) After accurate positioning, the suction bucket foundation is lifted by using the floating crane and is gradually placed into water until the bucket wall 1 and the subdivision plate 3 of the suction bucket foundation are inserted below the mud surface of the seabed, so that a closed space is formed between the suction bucket foundation and the mud surface.

(4) The annular vibration device 5 is hoisted by using a floating crane on the installation ship, slowly put down along the conical guide 6 of the top cover and placed on the upper part of the top cover 2 of the suction bucket foundation.

(5) Then, a vacuum pump and a water vapor pipeline 11 on the installation ship are used for extracting water vapor in the suction bucket foundation, connecting pipe fittings of water vapor valves 8 at the tops of all sub-cabins are connected into the guide columns 7 through hoses and are connected with the water vapor pipeline 11 led into the guide columns 7, the opening and closing of the water vapor valves 8 of the cabins are controlled through equipment on the installation ship, and the water vapor extraction amount of different cabins is controlled; meanwhile, electrical equipment on the ship is adjusted and installed, voltage and current in the vibrator 14 are controlled, so that the rotating speed of an eccentric wheel in the vibrator is controlled, the vibration connecting rod 16, the connecting spring 13 and the vibration mass block 12 are driven to cause vertical vibration, and the vibration is transmitted to the suction bucket top cover 2, the foundation bucket wall 1 and the foundation subdivision plate 3, so that the suction bucket foundation is assisted to sink.

(6) The level gauge 4 is installed in the center of the top cover, the levelness of the suction bucket foundation is monitored through the level gauge 4 and is transmitted to a control room of the installation ship, and if the suction bucket foundation is unevenly settled, effective leveling is carried out through a high-frequency vibration device and negative pressure. Different dithering devices may control their voltage and current separately.

(7) After the suction bucket foundation is installed at a specified depth, 4 lifting lugs 15 of the vibration device are connected by using a floating crane on an installation ship, and the annular vibration device 50 is lifted.

(8) The remaining suction bucket foundation is installed in place according to the previous procedure.

(9) And hoisting the jacket 18 to the top of the installed suction bucket foundation, connecting the bottom of the jacket 18 foundation and the top of the suction bucket foundation by using the guide post 7, the inverted bracket 9 and the insertion tip 10 arranged at the center of the top cover 2, and enhancing the action strength between the two parts by using an underwater grouting method.

(10) So far, the suction bucket foundation and the jacket are completed by the installation of the supporting structure, and the installation and the electrical debugging of the upper block 19 of the offshore electrical platform are carried out.

The invention breaks through the traditional suction bucket negative pressure sinking method, introduces the high-frequency vibration device to assist the sinking method, has safe and reliable structure and convenient construction method, and is very suitable for serving as a supporting structure of ocean engineering structures such as an offshore electrical platform and the like.

The above embodiment is merely a preferred embodiment of the present invention, and those skilled in the art will understand that modifications or substitutions of technical solutions or parameters in the embodiment can be made without departing from the principle and essence of the present invention, and all of them shall be covered by the protection scope of the present invention.