Foundation scouring protection device based on waste fan blades

Abstract

The utility model discloses a foundation scour protection device based on waste fan blades. The foundation scour protection device comprises a foundation pile and an energy dissipation pile group arranged on the upstream of the foundation pile. The optimal distance S from the energy dissipation pile group to the foundation pile is equal to 2D, and D is the diameter of the foundation pile; the ratio of the arrangement range D0 of the energy dissipation pile group to the diameter D of the foundation pile is 0.6-1; the arrangement mode of the energy dissipation pile group is a circle, a square or an equilateral triangle; the ratio of the height H0 of the energy dissipation pile group above the seabed surface to the water depth H of the seabed surface is 0.2-0.4; and the energy dissipation pile group adopts a plurality of blade columns which are formed by disassembling waste fan blades and have the same length and different cross section shapes. According to the utility model, the cut waste fan blades are used as basic scouring protection, so that the waste fan blades are fully utilized, and the recovery cost of the fan blades is reduced.

Description

Technical Field

[0001] The utility model relates to a foundation scouring protection device based on waste fan blades. Background Art

[0002] Scour is a natural phenomenon in which the soil around the bridge foundation is continuously eroded by water flow. This process will carry away the seabed materials near the foundation, resulting in the foundation being exposed or the elevation of the covering soil being lowered, weakening the lateral support of the foundation soil to the foundation, affecting the dynamic characteristics of the foundation, reducing the design bearing capacity of the foundation, and thus causing the collapse and damage of the structure. In order to reduce the risk of disasters caused by scour and alleviate the adverse effects caused by scour, engineering design and construction personnel need to adopt reasonable scour prevention and control measures. A large number of offshore wind farms, cross-sea bridges and other hydraulic structures in my country that have entered the foundation construction and subsequent commissioning stage are facing the problem of foundation scour, and it is urgent to strengthen the research on scour protection mechanisms and key technologies in related fields.

[0003] The rapid growth of the wind power industry has led to an increasing demand for wind turbine blades. The pollution caused by these blades after retirement cannot be ignored. Usually, the material weight of wind turbine blades per megawatt installed capacity is about 12 to 15 tons. The design life of wind turbine blades is about 20 years. Even if they are in full service, the carbon fiber reinforced composite material CFRP in retired blades still retains a high strength. The main material of wind turbine blades is glass fiber reinforced composite materials, which have problems such as difficult recycling technology and high cost. There is no ideal large-scale recycling method at home and abroad, so the systematic and high-value utilization of waste wind turbine blades is imminent. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a basic scour protection device based on waste fan blades. The waste fan blades are cut and used as basic scour protection, so that the waste fan blades are put to good use and the recycling cost of the fan blades is reduced.

[0005] The purpose of the utility model is achieved as follows: a foundation scour protection device based on waste fan blades, comprising a foundation pile and an energy dissipation pile group arranged upstream of the foundation pile; wherein,

[0006] The optimal distance S from the energy dissipation pile group to the foundation pile is 2D, where D is the diameter of the foundation pile;

[0007] The layout range of the energy dissipation pile group is D 0 The ratio to the diameter D of the foundation pile is 0.6 to 1;

[0008] The energy dissipation pile group is arranged in a circular, square or equilateral triangle manner;

[0009] The height H of the energy dissipation pile group above the seabed 0The ratio to the water depth H is 0.2 to 0.4;

[0010] The energy dissipation pile group adopts a plurality of blade columns which are disassembled from waste wind turbine blades and have the same length but different cross-sectional shapes.

[0011] The above-mentioned basic scour protection device based on waste fan blades, wherein the surface of each blade column is coated with a wear-resistant and corrosion-resistant coating.

[0012] In the above-mentioned foundation scour protection device based on waste wind turbine blades, the blade column is installed on the seabed through a mounting base, and the mounting base adopts a gravity base, a suction bucket base or a pile foundation.

[0013] The above-mentioned foundation scour protection device based on waste wind turbine blades, wherein the blade column is installed on the seabed by hammering, static pressure or negative pressure sinking

[0014] The utility model is characterized in that the waste fan blades are disassembled into a plurality of blade columns as an energy dissipation pile group of the foundation piles, so as to reduce the speed of the incoming flow in an energy dissipation manner and reduce the scouring energy, so that the scouring of the incoming flow mainly acts on the energy dissipation pile group in front of the foundation piles, thereby preventing the foundation piles at the rear from being harmed by scouring, making full use of the waste fan blades and reducing the recycling cost of the fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an elevation view of the foundation scour protection device based on waste fan blades of the utility model;

[0016] Figure 2 It is a plan view of the foundation scour protection device based on waste fan blades of the utility model;

[0017] Figure 3a It is a structural schematic diagram of the waste blades used in the utility model;

[0018] Figure 3b It is a cross-sectional view of the waste blades used in the utility model;

[0019] Figure 4 It is a structural schematic diagram of a first installation method of a blade column in a foundation scour protection device based on waste fan blades of the utility model;

[0020] Figure 5 It is a structural schematic diagram of a second installation method of a blade column in a foundation scour protection device based on waste fan blades of the utility model;

[0021] Figure 6It is a structural schematic diagram of a third installation method of a blade column in a foundation scour protection device based on waste fan blades of the utility model; DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] See also Figures 1 to 6 The utility model discloses a foundation scour protection device based on waste wind turbine blades, comprising a foundation pile 1 and an energy dissipation pile group 2 arranged upstream of the foundation pile 1 .

[0024] The optimal distance S=2D from the energy dissipation pile group 2 to the foundation pile 1, where D is the diameter of the foundation pile 1; the maximum local scour depth of the foundation pile 1 is the smallest, and the energy dissipation pile group 2 has the best protective effect on the foundation pile 1. As the arrangement distance of the energy dissipation pile group 2 continues to increase, the protective effect of the energy dissipation pile group 2 on the foundation pile 1 gradually decreases.

[0025] Arrangement range D of energy dissipation pile group 2 0 The ratio of the diameter D of the foundation pile 1 is 0.6 to 1; when D 0 When / D = 0.6, the maximum local scour depth of foundation pile 1 is the largest, and the scour depth around energy dissipation pile group 2 is the smallest. 0 As D increases, the scouring depth around the energy dissipation pile group 2 increases linearly, and the maximum local scouring depth of foundation pile 1 gradually decreases. 0 When / D = 1, the maximum local scouring depth of the foundation pile tends to be stable. If the layout range of the energy dissipation pile group 2 is further increased, the maximum local scouring depth of the foundation pile 1 will no longer decrease significantly. The layout of the energy dissipation pile group 2 is circular, square or equilateral triangle; the layout range D 0 This is the diameter of a circle, the side length of a square, or the side length of an equilateral triangle.

[0026] The height H of the energy dissipation pile group 2 above the seabed 0 The ratio of water depth H is 0.2 to 0.4; when H 0 When / H=0.2, the local scour pit depth of energy dissipation pile group 2 and foundation pile 1 is the smallest overall; when H 0 When / H is between 0.2 and 0.4, the scouring depth of energy dissipation pile group 2 and foundation pile 1 does not change significantly; 0 As / H continues to increase, the scouring of energy dissipation pile group 2 and foundation pile 1 evolves violently, and the scouring depth and scouring range increase significantly.

[0027] The energy dissipation pile group 2 uses a plurality of blade columns 20 of the same length but different cross-sectional shapes, which are disassembled from waste wind turbine blades; the surface of each blade column 20 is coated with a wear-resistant and corrosion-resistant coating;

[0028] The blade column 20 is installed on the seabed through a mounting base; the mounting base adopts a gravity base 3 (see Figure 4 ), suction bucket base 4 (see Figure 5 ) or pile foundation 5 (see Figure 6 );

[0029] The blade column 20 can also be installed on the seabed by hammering, static pressure or negative pressure sinking.

[0030] The utility model discloses a foundation scour protection device based on waste fan blades, which comprises the following steps during construction:

[0031] Step 1: predict the scour depth based on existing theories, determine the scour protection scheme for foundation piles, and arrange energy dissipation pile groups upstream of the foundation piles;

[0032] Step 2: Determine the disassembly plan of the blades according to the size of the waste wind turbine blades and the local water depth and scouring conditions, and physically cut the waste blades on land according to the disassembly plan; when cutting the waste blades, first cut the waste blades horizontally along the length direction into several blade segments of similar length (see Figure 3a ), and then cut along the cross section of each blade segment into a plurality of blade columns 20 with different cross-sectional shapes (see Figure 3b ); The length of each blade column 20 should ensure that after deducting the length of the connection section with the mounting base, the height H of the blade column 20 above the seabed surface 0 The ratio of the water depth H is between 0.2 and 0.4; forming a plurality of blade columns 20, and coating the surface of the blade columns 20 with a layer of wear-resistant and corrosion-resistant coating, such as polymer, metal alloy, etc., after the cutting is completed;

[0033] Step 3: Determine the installation form of the blade column according to the site geological conditions and engineering equipment; the blade column can be installed by gravity base installation, suction bucket base suction sinking installation, and pile foundation hammering or static pressure installation;

[0034] When the gravity base 3 is installed, the root of the blade column 20 can be inserted into the reserved hole at the top of the gravity base 3 and cast directly (see Figure 4 ).

[0035] When the suction bucket base 4 or the pile foundation 5 is used for installation, the root of the blade column 20 is connected to the connection between the suction bucket base 4 or the pile foundation 5 by pouring concrete (see Figure 5 and Figure 6 ).

[0036] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A foundation scour protection device based on waste wind turbine blades, comprising a foundation pile and an energy dissipation pile group arranged upstream of the foundation pile; characterized in that: The optimal distance S from the energy dissipation pile group to the foundation pile is 2D, where D is the diameter of the foundation pile; The ratio of the arrangement range D0 of the energy dissipation pile group to the diameter D of the foundation pile is 0.6 to 1; The energy dissipation pile group is arranged in a circular, square or equilateral triangle manner; The ratio of the height H0 of the energy dissipation pile group above the seabed surface to the water depth H is 0.2 to 0.4; The energy dissipation pile group adopts a plurality of blade columns which are disassembled from waste wind turbine blades and have the same length but different cross-sectional shapes.

2. The foundation scour protection device based on waste fan blades according to claim 1 is characterized in that: The surface of each blade column is coated with a wear-resistant and corrosion-resistant coating.

3. The foundation scour protection device based on waste fan blades according to claim 1 is characterized in that: The blade column is installed on the seabed through a mounting base, and the mounting base adopts a gravity base, a suction bucket base or a pile foundation.

4. The foundation scour protection device based on waste fan blades according to claim 1 is characterized in that: The blade column is installed on the seabed by hammering, static pressure or negative pressure sinking.

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