INTELLIGENT BIONIC SCOURING PROTECTION STRUCTURE FOR BUCKET FOUNDATION AND APPLICATION METHOD THEREFOR

Description

FIELD OF THE INVENTION

The present invention relates to the field of offshore wind power engineering, and in particular to an intelligent bionic scouring protection structure for a cylindrical foundation and an application method thereof.

BACKGROUND OF THE INVENTION

During an offshore wind power construction process, foundation scouring protection must be performed. A group cylindrical catheterostat foundation is comprehensively and locally distributed in a scouring range, and a scouring range thereof is large, but an overall scouring ditch is shallow, which is obviously different from a single-pile scouring ditch. A seabed scouring protection technology has always been one of important topics in the field of marine engineering in various countries.

The scouring protection for an existing cylindrical foundation is mostly hard protection measures, such as ripraps, geotextile bags (geotextile woven bags, geomembrane bags, etc. filled with concrete blocks, stones, sand and soil), underwater concrete bottom protection, concrete precast blocks (similar to a mechanism of stone blocks), steel reinforcement cages or geogrid cages filled with stones, sludge solidification and other technologies.

To sum up, when the existing hard scouring protection technology is applied in practice, throwing and filling accuracy is poor, and a protection effect is general, which may cause a damage to a barrel body, and the cylindrical foundation is of a thin-walled structure, which has a greater potential harm; a diameter of the cylindrical foundation is large, and a protection range of a group cylindrical foundation is wider, so that a construction time and a material cost will be greatly increased; and a disadvantage of secondary scouring exists around the hard protection, which will lead to repeated construction and a higher subsequent maintenance cost. However, an existing bionic scouring protection technology fixed by grid concrete or rivets is difficult to be applied in the field of offshore wind power due to a complicated bottom fixing structure, inconvenient construction and a higher construction cost.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings in the prior art, the present invention aims at providing an intelligent bionic scouring protection technology for a cylindrical foundation with flexibility, easy laying, little structural damage and strong durability.

In order to solve the above technical problems, the present invention proposes the following technical solution: an intelligent bionic scouring protection structure for a cylindrical foundation and an application method thereof, wherein the protection structure is formed by connecting bionic units; and

• • an uppermost layer of the bionic unit is a bionic grass bundle, a bottom end of the bionic grass bundle is sleeved inside a bundle tube, the bundle tube is fixedly connected with a fiber mesh layer through a binding wire, connecting rings are fixed at both ends of the fiber mesh layer through the binding wire, two adjacent fiber mesh layers are connected through the connecting ring; and
  • a bottom portion of the bionic unit is provided with a seabed connecting structure for fixing the whole protection structure.

each bionic grass bundle is composed of a plurality of bionic grass blades; and the bionic grass blades are made of elongated fiber materials.

The elongated fiber material is made of polyethylene or polypropylene; and every 5-10 bionic grass blades form one bionic grass bundle.

the bundle tube adopts a flexible opened thin tube; and the binding wire is made of an anticorrosive alloy material.

The fiber mesh layer is formed by interweaving horizontal and vertical fiber ribbons in a three-dimensional grid shape with a certain height.

The connecting ring is made of an anticorrosive steel wire rope.

The seabed connecting structure comprises a bionic root system and a balancing weight; and the bionic root system is bound with the fiber mesh layer through the binding wire; and

• • the bionic root system comprises a trunk and roots, a plurality of roots are uniformly distributed at each node of the trunk, and the roots are provided with a plurality of length-grade subdivision structures downwards.

The trunk and the roots are both made of fiber materials; and

• • the balancing weight is a cuboid concrete balancing weight, the balancing weight is made of heavy chains extending from inside to outside, each balancing weight is provided with four heavy chains, and the heavy chains are bound with the fiber mesh layer through the binding wires.

The bionic units are connected through the connecting ring to form a bionic protection belt, a specific arrangement form of the bionic protection belt is selected according to a form of the cylindrical foundation to be protected, and a circular arc or a box shape is selected; and

• • a height of the bionic grass bundle at an upper portion of the bionic protection belt is customized according to a size of a common wave current at a position where the cylindrical foundation is located, the arrangement form of the bionic protection belt is accurately adjusted according to an intelligent analysis and calculation result for the wave current in a special direction, and thus enhancing protection and ensuring that both a flow velocity and a wave height of the wave current are sharply declined after the wave current passes through the bionic protection belt.

An application method of the intelligent bionic scouring protection structure for the cylindrical foundation comprises the following steps of:

• • step 1: obtaining basic protection parameters: obtaining a specific foundation size of the cylindrical foundation to be protected, wave current and geological parameters of a sea area where the cylindrical foundation is located;
  • step 2: calculating specific construction parameters: by an intelligent analysis and calculation system, determining the arrangement form of the bionic protection belt and the height of the bionic grass bundle according to the size of the cylindrical foundation to be protected and a sea condition in the sea area in step 1, determining whether to require to enhance the protection against the waves in a specific direction, and calculating clear construction parameters;
  • step 3: performing connecting preparation for the bionic unit on land: after completing automatic analysis and calculation by the calculation system in step 2, connecting the bionic unit to a bionic protection belt with a certain length on land, and then hoisting to a construction ship, and transporting the bionic protection belt to a construction sea area by the construction ship;
  • step 4: performing seabed pretreatment: digging a buried trench at a position where the bionic protection belt being scheduled to be installed on the seabed; and
  • step 5: installing the bionic protection belt: using a crane to hoist the bionic protection belt to the buried trench at the scheduled installation position according to a calculation rate, adjusting a depth in real time through a positioning device, and backfilling foundation soil to a height of the fiber mesh layer after adjustment until completing laying of the bionic protection belt.

The present invention has the following beneficial effects.

1. According to the present invention, an upper layer, a middle layer and a lower layer take flexible fiber materials as a main body, so that an impact on the cylindrical foundation structure is small, and a problem that hard protection will cause damage to an anticorrosive coating or structure is solved; and flexible bionic protection does not have a secondary scouring problem in hard protection, so that multiple constructions are not needed.

2. According to the present invention, foundation soil can be filled in a three-dimensional grid cushion layer in the middle layer, and a bionic root system structure in the lower layer is easy to be buried, which increases the construction efficiency and solves a problem that the previous bionic protection structure is too complicated and difficult to apply; and the middle layer and the lower layer are integrated with a seabed foundation, which plays a reinforcing role.

3. According to the present invention, the upper layer, the middle layer and the lower layer are divided, and the material is mainly durable and anticorrosive flexible fiber material, which replaces the previous hard scouring protection such as ripraps and sand bags; a bottom portion of the protection structure is mainly based on a bionic root structure, and is supplemented by a simple concrete fixing structure, which replaces the previous bionic grass fixed with rivets or lattice type concrete.

4. According to the present invention, a height of the bionic grass bundle at an upper portion of the bionic protection belt is customized according to a size of a common wave current at a position where the cylindrical foundation is located, the arrangement form of the bionic protection belt is accurately adjusted according to an intelligent analysis and calculation result for the wave current in a special direction, and thus enhancing protection and ensuring that both a flow velocity and a wave height of the wave current are sharply declined after the wave current passes through the bionic protection belt.

5. The arrangement of the bionic protection belt in the present invention can be selected in an arc shape or a box shape according to the form of the foundation to be protected; the bionic protection belt is formed by splicing a plurality of protection units, so that the form and range of the protection belt can be intelligently adjusted according to characteristics of waves and currents; and the bionic protection belt is protected around the cylindrical foundation in a circular ring shape, which prevents the seabed foundation soil from being scoured by the wave current.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further illustrated in conjunction with the accompanying drawings and the embodiments.

FIG. 1 refers to an overall schematic structural diagram of a protection structure according to the present invention.

FIG. 2 refers to a local structural diagram of a position of a connecting ring according to the present invention.

FIG. 3 is a partial enlarged drawing of the protection structure according to the present invention.

FIG. 4 is a top view of the arrangement for the protection structure according to the present invention.

FIG. 5 is a schematic diagram of a protection principle during the operation of the protection structure according to the present invention.

FIG. 6 is a flow chart of an intelligent analysis and calculation system in a specific application method of the protection structure according to the present invention.

FIG. 7 is a layout diagram of the protection structure applied to a frequent wave current according to the present invention.

FIG. 8 is a layout diagram of the protection structure applied to a seasonal wave current according to the present invention.

In the drawings: 1—bionic grass bundle, 2—binding wire, 3—bundle tube, 4—connecting ring, 5—fiber mesh layer, 6—trunk, 7—root, 8—balancing weight, 9—heavy chain, 10—cylindrical foundation, 11—bionic protection belt, 12—foundation soil, and 13—wave current.

DETAILED DESCRIPTION OF SOME EMBODIMENTS

The embodiments of the present invention will be further illustrated in conjunction with the accompanying drawings.

Embodiment 1

Referring to FIG. 1 to FIG. 8, an intelligent bionic scouring protection structure for a cylindrical foundation, wherein the protection structure is formed by connecting bionic units; an uppermost layer of the bionic unit is a bionic grass bundle 1, a bottom end of the bionic grass bundle 1 is sleeved inside a bundle tube 3, the bundle tube 3 is fixedly connected with a fiber mesh layer 5 through a binding wire 2, connecting rings 4 are fixed at both ends of the fiber mesh layer 5 through the binding wire, two adjacent fiber mesh layers 5 are connected through the connecting ring 4; and a bottom portion of the bionic unit is provided with a seabed connecting structure for fixing the whole protection structure. The above protection structure with an upper layer, a middle layer and a lower layer is adopted to replace traditional hard scouring protection such as ripraps and sand bags, which solves a problem that hard protection will cause damage to an anticorrosive coating or structure.

Further, each bionic grass bundle 1 is composed of a plurality of bionic grass blades; and the bionic grass blades are made of elongated fiber materials. The bionic grass bundle 1 is adopted to float under an action of waves, thereby buffering an impact of the waves and playing a good anti-scouring effect.

Further, the elongated fiber material is made of polyethylene or polypropylene; and every 5-10 bionic grass blades form one bionic grass bundle 1. Adopting polyethylene or polypropylene in a flexible structure ensures to float with the wave.

Further, the bundle tube 3 adopts a flexible opened thin tube; and the binding wire 2 is made of an anticorrosive alloy material. The bundle tube 3 can be used to reliably connect the bionic grass bundle 1 and prevent the bionic grass bundle from falling off.

Further, the fiber mesh layer 5 is formed by interweaving horizontal and vertical fiber ribbons in a three-dimensional grid shape with a certain height. By adopting the three-dimensional mesh fiber mesh layer 5, the foundation soil can be filled, thereby enhancing the fixation reliability of the whole bionic grass bundle 1. In addition, the three-dimensional mesh can play a good role in protecting the seabed and preventing scouring to enhance the protection effect.

Further, the connecting ring 4 is made of an anticorrosive steel wire rope. The anticorrosive steel wire rope has a good anticorrosive effect, thus prolonging a service life of the anticorrosive steel wire and ensuring the connecting reliability.

Further, the seabed connecting structure comprises a bionic root system and a balancing weight 8; and the bionic root system is bound with the fiber mesh layer 5 through the binding wire; the bionic root system comprises a trunk 6 and roots 7, a plurality of roots 7 are uniformly distributed at each node of the trunk 6, the roots 7 are provided with a plurality of length-grade subdivision structures downwards; and the trunk 6 and the roots 7 are both made of fiber materials. A bottom portion of the protection structure is mainly based on a bionic root structure, and is supplemented by a simple concrete fixing structure, which replaces the previous bionic grass fixed with rivets or lattice type concrete, thereby simplifying a bottom fixing construction process and reducing a construction difficulty. The bionic root system is adopted to enhance a fixing effect of the whole fiber mesh layer 5, so that the whole bionic root system can be reliably fixed on the seabed.

Further, the balancing weight 8 is a cuboid concrete balancing weight, the balancing weight 8 is made of heavy chains 9 extending from inside to outside, each balancing weight 8 is provided with four heavy chains 9, and the heavy chains 9 are bound with the fiber mesh layer 5 through the binding wires. A connecting effect between the seabed connecting structure and the seabed is improved to some extent by the balancing weight 8.

Further, the bionic units are connected through the connecting ring 4 to form a bionic protection belt 11, a specific arrangement form of the bionic protection belt 11 is selected according to a form of the cylindrical foundation 10 to be protected, and a circular arc or a box shape is selected. By choosing different combination types, different protection requirements can be adapted, which enhances the adaptability.

Further, a height of the bionic grass bundle 1 at an upper portion of the bionic protection belt 11 is customized according to a size of a common wave current 13 at a position where the cylindrical foundation 10 is located, the arrangement form of the bionic protection belt 11 is accurately adjusted according to an intelligent analysis and calculation result for the wave current in a special direction, and thus enhancing protection and ensuring that both a flow velocity and a wave height of the wave current are sharply declined after the wave current 13 passes through the bionic protection belt 11.

Embodiment 2

An application method of the intelligent bionic scouring protection structure for the cylindrical foundation comprises the following steps of:

• • step 1: obtaining basic protection parameters: obtaining a specific foundation size of the cylindrical foundation 10 to be protected, wave current and geological parameters of a sea area where the cylindrical foundation is located;
  • step 2: calculating specific construction parameters: by an intelligent analysis and calculation system, determining the arrangement form of the bionic protection belt 11 and the height of the bionic grass bundle 1 according to the size of the cylindrical foundation to be protected and a sea condition in the sea area in step 1, determining whether to require to enhance the protection against the waves in a specific direction, and calculating clear construction parameters;
  • step 3: performing connecting preparation for the bionic unit on land: after completing automatic analysis and calculation by the calculation system in step 2, connecting the bionic unit to a bionic protection belt 11 with a certain length on land, and then hoisting to a construction ship, and transporting the bionic protection belt 11 to a construction sea area by the construction ship;
  • step 4: performing seabed pretreatment: digging a buried trench at a position where the bionic protection belt 11 being scheduled to be installed on the seabed; and
  • step 5: installing the bionic protection belt 11: using a crane to hoist the bionic protection belt 11 to the buried trench at the scheduled installation position according to a calculation rate, adjusting a depth in real time through a positioning device, and backfilling foundation soil to a height of the fiber mesh layer 5 after adjustment until completing laying of the bionic protection belt 11.

Embodiment 3

Referring to FIG. 7, when the frequent wave current exists on one side, the outer arc bionic protection belt 11 is additionally arranged on one side with the frequent wave current, so as to protect the cylindrical foundation 10, and finally achieve the best protection effect.

Embodiment 4

Referring to FIG. 8, in view of a seasonal wave current, the outer arc bionic protection belt 11 is additionally arranged on an outer ring at the side where the seasonal wave current is located, so as to protect the cylindrical foundation 10, and finally achieve the best protection effect.