Large diameter steel pipe pile scouring and solidification soil protection and construction method for offshore wind turbines

Abstract

The present invention relates to a protection and construction method for scouring and solidifying soil blanket of large-diameter steel pipe piles for offshore wind turbines. A reinforcing steel cylinder is arranged in a scouring pit at the bottom of the steel pipe pile of the wind turbine, which can provide effective protection for the steel pipe pile of the wind turbine and avoid direct scouring of the steel pipe pile of the wind turbine by water flow; an annular steel mesh is arranged below the solidifying soil blanket, and underwater concrete is injected into the mesh to avoid the injected underwater concrete being washed away by water flow, thereby improving the durability of the reinforced structure; the solidifying soil blanket is lowered into place as a whole through a suspension bracket to avoid wrinkles when sinking to the bottom of the water, thereby effectively ensuring that the solidifying soil blanket covers the scouring pit; the suspension bracket is sleeved on the steel pipe pile of the wind turbine through a floating steel cylinder, and the suspension bracket is controlled to float and sink along the steel pipe pile of the wind turbine by adjusting an air bag, thereby effectively solving the problems of hoisting and positioning.

Description

Technical Field

[0001] The invention belongs to the field of offshore wind turbine steel pipe pile reinforcement construction, and in particular relates to a soil scouring and solidification protection and construction method for large-diameter steel pipe piles of offshore wind turbines. Background Art

[0002] In order to effectively utilize marine wind energy, a large number of wind farms have been built in the ocean, and wind turbines are installed on large-diameter steel pipe piles. As the operating time increases, under the action of tides, the original pile protection and soil are washed away, forming scour pits around the steel pipe piles. In order to ensure the stable operation of wind turbines, it is necessary to reconstruct protective structures around the steel pipe piles. The traditional construction method is mainly to dump gravel, sandbags and other measures. Although this method is simple, it has poor durability and is easily damaged again after a period of scouring. To this end, engineering and technical personnel have proposed a comprehensive reinforcement technology of dumping gravel and solidifying soil. The scour pit is backfilled by dumping gravel, and a layer of solidifying soil is laid on the top of the dumping gravel to cover it, which effectively ensures the integrity of the dumping gravel and has a good reinforcement effect. However, this method also has some construction difficulties: the volume and position of the dumping gravel need to be accurately controlled, and the placement of the solidifying soil requires the use of large floating crane equipment, which is difficult and costly to construct. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a large-diameter steel pipe pile scouring and solidifying soil protection and construction method for offshore wind turbines.

[0004] This construction method for protecting the large-diameter steel pipe piles for offshore wind turbines by flushing and solidifying soil includes the following construction steps:

[0005] Step 1: With the fan steel pipe pile as the center, drive reinforcement steel pipe piles along the outer circumference of the scour pit;

[0006] Step 2: Sleeve the reinforcement steel cylinder onto the steel pipe pile of the fan; connect the inner end of the annular steel mesh to the reinforcement steel cylinder, and connect the grouting pipe 2 to the grouting port of the reinforcement steel cylinder;

[0007] Step 3: Sink the reinforcement steel cylinder into the seabed along the wind turbine steel pipe pile, and sink the annular steel mesh together with the reinforcement steel cylinder;

[0008] Step 4: Put the floating steel cylinder on the steel pipe pile of the wind turbine, discharge the water in the regulating airbag, make the floating steel cylinder float on the water surface, and then install the suspension bracket radially on the outside of the floating steel cylinder;

[0009] Step 5: Place supporting steel radially below the solidified soil, start the electric-controlled magnet on the suspension bracket to attract the supporting steel, and hang it on the suspension bracket;

[0010] Step 6: sink into the solidified soil blanket, and inject underwater concrete into the scouring pit below the solidified soil blanket through the grouting pipe to complete the reinforcement work of the scouring pit around the wind turbine steel pipe piles.

[0011] Preferably, in step 1, adjacent reinforced steel pipe piles are fitted together, the top heights of the reinforced steel pipe piles are kept consistent, and the top heights of the reinforced steel pipe piles are higher than the height of the seabed.

[0012] Preferably, in step 2, the reinforcement steel cylinder includes two semi-circular arc plates, and after the two semi-circular arc plates are put on the wind turbine steel pipe piles, the two semi-circular arc plates are welded into a whole to form a reinforcement steel cylinder; two semicircular annular steel meshes are tied, and then the inner ends of the annular steel meshes are inserted into the steel bar anchor holes on the reinforcement steel cylinder, and the two annular steel meshes are tied into a whole; a support ring plate is provided at the lower end of the reinforcement steel cylinder, and the support ring plate is supported on the bottom of the scouring pit; an anti-collision ring plate is provided at the upper end of the reinforcement steel cylinder, and steel bar anchor holes are provided on the edge of the anti-collision ring plate, and the steel bar anchor holes provide a fixed position for the annular steel mesh; a grouting port is provided in the middle of the anti-collision ring plate as an interface of a grouting pipe 2; a grouting hole is provided on the side wall of the reinforcement steel cylinder, and underwater concrete enters between the reinforcement steel cylinder and the wind turbine steel pipe pile through the grouting hole.

[0013] Preferably, in step 3, the outer end of the annular steel mesh is inserted into the reinforced steel pipe pile.

[0014] Preferably, in step 4, the floating steel cylinder includes two semicircles, which are put on the steel pipe piles of the wind turbine and connected by clamps to form a floating steel cylinder; a plurality of regulating air bags are provided on the floating steel cylinder, and a drainage valve is provided on the upper part of the regulating air bags. The water intake in the regulating air bags is adjusted by the valves to control the buoyancy and sinking of the floating steel cylinder, and the water in the regulating air bags is discharged to make the floating steel cylinder float on the water surface, and then a suspension bracket is radially installed on the outer side of the floating steel cylinder, and the suspension bracket is fixed on the floating steel cylinder.

[0015] Preferably, in step 5, the solidified soil blanket includes two semicircular structures, the two semicircular structures of the solidified soil blanket are spread out on a flat-bed work boat, and supporting steel sections are radially placed under the semicircular structures of the solidified soil blanket, and then the flat-bed work boat loaded with the solidified soil blanket is driven to the bottom of the suspension bracket, and the electric-controlled magnets on the suspension bracket are respectively started to suck the supporting steel sections under the two semicircular structures of the solidified soil blanket, and then the two semicircular structures of the solidified soil blanket are connected into a whole using a steel cable; a buoy is tied to the end of the supporting steel section, and the buoy floats on the water surface. When the electric-controlled magnet is turned off to release the supporting steel section, the buoy will lift the supporting steel section.

[0016] As a preference, there are two methods for sinking the solidified soil blanket in step 6, namely:

[0017] Fill first and then sink: first fill the solidified soil into the solidified soil blanket, then turn off the electric control magnet to release the supporting steel, and sink the solidified soil blanket as a whole to the seabed and onto the annular steel bar net;

[0018] Sink first and then fill: first insert a grouting pipe into the solidified soil blanket, then turn off the electric control magnet to release the supporting steel, sink the solidified soil blanket as a whole to the seabed and land on the annular steel bar mesh, and then fill the solidified soil into the solidified soil blanket through the grouting pipe.

[0019] Preferably, in step 5, steel wire ropes are provided at both ends of the supporting steel section, and the steel wire ropes are tied to the suspension bracket. The supporting steel section is tied to the suspension bracket by setting the steel wire ropes to prevent the electric-controlled magnet from suddenly failing and causing the supporting steel section to detach and lose support for the solidified soil. When the electric-controlled magnet is turned off, the steel wire rope is untied from the suspension bracket.

[0020] The large diameter steel pipe pile scouring and solidifying soil protection for offshore wind turbines is obtained by any of the above-mentioned methods.

[0021] The beneficial effects of the present invention are:

[0022] 1) The present invention arranges a reinforcement steel cylinder in the scouring pit at the bottom of the wind turbine steel pipe pile, which can provide effective protection for the wind turbine steel pipe pile and prevent the wind turbine steel pipe pile from being directly scourred by water.

[0023] 2) The present invention arranges an annular steel mesh below the solidified soil and injects underwater concrete into it, thereby preventing the injected underwater concrete from being washed away by water flow, thereby improving the durability of the reinforced structure.

[0024] 3) The solidified soil of the present invention is lowered into place as a whole through the suspension bracket to avoid wrinkles when sinking to the bottom of the water, and effectively ensures that the solidified soil covers the scouring pit.

[0025] 4) The suspension bracket of the present invention is sleeved on the steel pipe pile of the wind turbine through a floating steel cylinder, and the suspension bracket is controlled to float up and sink along the steel pipe pile of the wind turbine by adjusting the airbag, which effectively solves the problem of hoisting and positioning.

[0026] 5) The solidified soil of the present invention is hung under the suspension bracket through the support steel, and the support steel is fixed and released by an electric-controlled magnet. The structure is simple and reliable, and the problem that the support steel cannot be unhooked is avoided; a float is tied to the support steel, and after being detached from the suspension bracket, it is hung in the water through the float, which solves the problem of recovery after detachment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the construction method of the present invention;

[0028] Figure 2 This is the construction process diagram of the large diameter steel pipe piles for wind turbines, which are first filled with solidified soil and then sunk;

[0029] Figure 3 This is the construction process diagram of the large diameter steel pipe piles for wind turbines, where the soil is first sunk and then filled;

[0030] Figure 4 It is a schematic diagram of the solidified soil being sunk;

[0031] Figure 5 It is a schematic diagram of the solidified soil being sunk into place;

[0032] Figure 6 It is a half-section view of the three-dimensional structure of the reinforced steel cylinder;

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of a circular floating steel cylinder;

[0034] Figure 8 It is a schematic diagram of the reinforced steel cylinder structure.

[0035] Explanation of the reference numerals: 11-water surface, 12-seabed, 13-steel pipe piles for wind turbines, 14-scouring pit, 21-floating steel cylinder, 22-adjusting airbag, 23-valve, 24-hoop, 25-suspension bracket, 26-supporting steel, 27-floating ball, 28-electrically controlled magnet, 29-steel wire rope, 31-solidified soil blanket, 32-grouting pipe one, 33-solidified soil, 41-reinforced steel cylinder, 42-anti-collision ring plate, 43-support ring plate, 44-rebar anchor hole, 45-grouting port, 46-grouting pipe two, 47-grouting hole, 48-underwater concrete, 51-annular steel mesh, 52-reinforced steel pipe piles. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0037] Embodiment 1

[0038] As an example, Figure 1 As shown, this offshore wind turbine large diameter steel pipe pile scouring and solidifying soil protection construction method includes the following construction steps:

[0039] Step 1: With the wind turbine steel pipe pile 13 as the center, drive the reinforcement steel pipe pile 52 along the outer circumference of the scouring pit 14;

[0040] Step 2, put the reinforcement steel cylinder 41 on the wind turbine steel pipe pile 13; connect the inner end of the annular steel mesh 51 to the reinforcement steel cylinder 41, and connect the grouting pipe 46 to the grouting port 45 of the reinforcement steel cylinder 41;

[0041] Step 3, sink the reinforcement steel cylinder 41 into the seabed 12 along the wind turbine steel pipe pile 13, and the annular steel mesh 51 is sunk together with the reinforcement steel cylinder 41;

[0042] Step 4: Put the floating steel cylinder 21 on the wind turbine steel pipe pile 13, discharge the water in the regulating airbag 22, make the floating steel cylinder 21 float on the water surface, and then install the suspension bracket 25 radially outside the floating steel cylinder 21;

[0043] Step 5: Place the support steel 26 radially below the solidified soil quilt 31, start the electric-controlled magnet 28 on the suspension bracket 25 to attract the support steel 26, and hang it on the suspension bracket 25;

[0044] Step 6: sink into the solidified soil blanket 31, and inject underwater concrete 48 into the scouring pit below the solidified soil blanket 31 through the grouting pipe 32 to complete the reinforcement operation of the scouring pit around the wind turbine steel pipe pile 13.

[0045] Embodiment 2

[0046] As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific construction method for protecting the soil by scouring and solidifying large-diameter steel pipe piles for offshore wind turbines:

[0047] Step 1: With the fan steel pipe pile 13 as the center, drive a small diameter reinforcement steel pipe pile 52 along the outer circumference of the scouring pit 14; Figure 1 shown.

[0048] Step 2: Put two semicircular reinforcement steel cylinders 41 on the wind turbine steel pipe pile 13, and then weld the two semicircular reinforcement steel cylinders 41 into a whole;

[0049] Step 3, tie two semicircular annular steel meshes 51, then insert the inner end of the annular steel mesh 51 into the steel bar anchor hole 44 on the reinforcement steel cylinder 41, and tie the two annular steel meshes 51 into a whole, and connect the grouting pipe 46 to the grouting port 45 on the reinforcement steel cylinder 41;

[0050] Step 4, sink the reinforcement steel cylinder 41 into the seabed 12 along the wind turbine steel pipe pile 13, and the annular steel mesh 51 is sunk together with the reinforcement steel cylinder 41;

[0051] Step 5: Put two semicircular floating steel cylinders 21 on the wind turbine steel pipe pile 13, and then tighten the bolts on the clamp 24 to form a whole; discharge the water in the regulating airbag 22 to make the floating steel cylinder 21 float on the water surface, and then install the suspension bracket 25 radially on the outer side of the floating steel cylinder 21, and the suspension bracket 25 is fixed on the floating steel cylinder 21;

[0052] Step 6: Spread the semicircular solidified soil blanket 31 on the flatbed work boat, and place the supporting steel 26 radially below the solidified soil blanket 31. Then, drive the flatbed work boat loaded with the solidified soil blanket 31 to the bottom of the suspension bracket 25, start the electric-controlled magnet 28 on the suspension bracket 25 to attract the supporting steel 26, and then drive the flatbed transport boat away. Hang another semicircular solidified soil blanket 31 on the suspension bracket 25 according to the above method, and then use a steel cable to connect the two semicircular solidified soil blankets 31 into a whole.

[0053] Step 7: There are two ways to sink the solidified soil blanket 31. One is to first fill the solidified soil 33 into the solidified soil blanket 31, and then turn off the electro-magnet 28 to release the supporting steel 26, so that the solidified soil blanket 31 is sunk to the seabed as a whole and falls on the annular steel mesh 51; the other is to insert a grouting pipe 32 into the solidified soil blanket 31, and then turn off the electro-magnet 28 to release the supporting steel 26, so that the solidified soil blanket 31 is sunk to the seabed as a whole and falls on the annular steel mesh 51, and then fill the solidified soil 33 into the solidified soil blanket 31 through the grouting pipe 32;

[0054] Step 8: After the solidified soil blanket 31 is placed in place on the seabed, underwater concrete 48 is injected into the scouring pit below the solidified soil blanket 31 through the grouting pipe 1 32 to complete the reinforcement operation of the scouring pit around the wind turbine steel pipe pile 13.

[0055] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0056] Embodiment 3

[0057] As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, a more specific construction method for protecting the soil by scouring and solidifying large-diameter steel pipe piles for offshore wind turbines:

[0058] In step 1, the small-diameter reinforced steel pipe piles 52 are tightly fitted together, and the top height is kept constant and higher than the height of the seabed 12 .

[0059] In step 2 and step 3, Figure 6As shown, a support ring plate 43 is provided at the lower end of the reinforcement steel cylinder 41, and the support ring plate 43 is supported at the bottom of the scouring pit 14 to prevent the reinforcement steel cylinder 41 from sinking into the scouring pit 14; an anti-collision ring plate 42 is provided at the upper end of the reinforcement steel cylinder 41, and a steel bar anchor hole 44 is provided at the edge of the anti-collision ring plate 42. The steel bar anchor hole 44 can provide a fixed position for the annular steel mesh 51 to prevent the annular steel mesh 51 from separating from the reinforcement steel cylinder 41; a grouting port 45 is provided in the middle of the anti-collision ring plate 42 to provide an interface for a grouting pipe 46; a grouting hole 47 is provided on the side wall of the reinforcement steel cylinder 41 to facilitate the injection of underwater concrete 48 into between the reinforcement steel cylinder 41 and the wind turbine steel pipe pile 13 through the grouting hole 47, thereby improving the bonding strength between the reinforcement structure and the wind turbine steel pipe pile 13 and improving the reinforcement effect.

[0060] In step 4, the outer end of the annular steel mesh 51 is inserted into the reinforced steel pipe pile 52.

[0061] In step 5, Figure 7 As shown, a plurality of regulating air bags 22 are provided on the floating steel cylinder 21 , and a drainage valve 23 is provided on the upper part of the regulating air bags 22 . The water intake in the regulating air bags 22 is adjusted by the valve 23 to control the floating steel cylinder 21 to float or sink.

[0062] In step 6, Figure 3 and Figure 4 As shown, a float 27 is attached to the end of the support steel 26, and the float 27 floats on the water surface 11. When the electric-controlled magnet 28 is turned off to release the support steel 26, the float 27 will lift the support steel 26 to prevent it from sinking to the bottom of the water.

[0063] In step 6, Figure 8 As shown, steel wire ropes 29 are provided at both ends of the support steel 26, and the steel wire ropes 29 are tied to the suspension bracket 25. By arranging the steel wire ropes 29 to tie the support steel 26 to the suspension bracket 25, it is possible to prevent the electro-magnet 28 from suddenly failing, causing the support steel 26 to detach uncontrollably and lose support for the solidified soil 31. When closing the electro-magnet 28, the steel wire ropes 29 must be untied from the suspension bracket 25.

[0064] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for protecting the soil by flushing and solidifying large-diameter steel pipe piles for offshore wind turbines, characterized in that: The construction steps include: Step 1: With the wind turbine steel pipe pile as the center, drive reinforcement steel pipe piles along the outer circumference of the scour pit; Step 2: Sleeve the reinforcement steel cylinder onto the steel pipe pile of the fan; connect the inner end of the annular steel mesh to the reinforcement steel cylinder, and connect the grouting pipe 2 to the grouting port of the reinforcement steel cylinder; Step 3: Sink the reinforcement steel cylinder into the seabed along the wind turbine steel pipe pile, and sink the annular steel mesh together with the reinforcement steel cylinder; Step 4: Put the floating steel cylinder on the steel pipe pile of the wind turbine, discharge the water in the regulating airbag, make the floating steel cylinder float on the water surface, and then install the suspension bracket radially on the outside of the floating steel cylinder; Step 5: Place supporting steel radially below the solidified soil, start the electric-controlled magnet on the suspension bracket to attract the supporting steel, and hang it on the suspension bracket; Step 6: sink into the solidified soil blanket, and inject underwater concrete into the scouring pit below the solidified soil blanket through the grouting pipe to complete the reinforcement work of the scouring pit around the wind turbine steel pipe piles.

2. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil for offshore wind turbines according to claim 1 is characterized in that: In the step 1, adjacent reinforced steel pipe piles are fitted together, the top heights of the reinforced steel pipe piles are kept consistent, and the top heights of the reinforced steel pipe piles are higher than the height of the seabed.

3. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil for offshore wind turbines according to claim 1 is characterized in that: In the step 2, the reinforcement steel cylinder includes two semi-circular arc plates. After the two semi-circular arc plates are put on the wind turbine steel pipe piles, the two semi-circular arc plates are welded into a whole to form a reinforcement steel cylinder; two semi-circular annular steel meshes are tied, and then the inner ends of the annular steel meshes are inserted into the steel bar anchor holes on the reinforcement steel cylinder, and the two annular steel meshes are tied into a whole; a support ring plate is provided at the lower end of the reinforcement steel cylinder, and the support ring plate is supported at the bottom of the scouring pit; an anti-collision ring plate is provided at the upper end of the reinforcement steel cylinder, and steel bar anchor holes are provided on the edge of the anti-collision ring plate, and the steel bar anchor holes provide a fixed position for the annular steel mesh; a grouting port is provided in the middle of the anti-collision ring plate as an interface of a grouting pipe 2; a grouting hole is provided on the side wall of the reinforcement steel cylinder, and underwater concrete enters between the reinforcement steel cylinder and the wind turbine steel pipe pile through the grouting hole.

4. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil of offshore wind turbines according to claim 1 is characterized in that: In step 3, the outer end of the annular steel mesh is inserted into the reinforced steel pipe pile.

5. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil for offshore wind turbines according to claim 1 is characterized in that: In step 4, the floating steel cylinder includes two semicircles, which are put on the steel pipe piles of the wind turbine and connected by clamps to form a floating steel cylinder; a plurality of regulating air bags are provided on the floating steel cylinder, and a drainage valve is provided on the upper part of the regulating air bags. The water intake in the regulating air bags is adjusted by the valves to control the buoyancy and sinking of the floating steel cylinder, and the water in the regulating air bags is discharged to make the floating steel cylinder float on the water surface, and then a suspension bracket is radially installed on the outer side of the floating steel cylinder, and the suspension bracket is fixed on the floating steel cylinder.

6. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil for offshore wind turbines according to claim 1 is characterized in that: In step 5, the solidified soil blanket includes two semicircular structures, which are spread out on a flat-bed work boat, and supporting steel sections are placed radially under the semicircular structures of the solidified soil blanket. The flat-bed work boat loaded with the solidified soil blanket is then driven to the bottom of the suspension bracket, and the electric-controlled magnets on the suspension bracket are respectively started to attract the supporting steel sections under the two semicircular structures of the solidified soil blanket. Then, the two semicircular structures of the solidified soil blanket are connected into a whole using a steel cable; a buoy is tied to the end of the supporting steel section, and the buoy floats on the water surface. When the electric-controlled magnet is turned off to release the supporting steel section, the buoy will lift the supporting steel section.

7. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil of offshore wind turbines according to claim 1 is characterized in that: There are two methods for sinking the solidified soil in step 6, namely: Fill first and then sink: first fill the solidified soil into the solidified soil blanket, then turn off the electric control magnet to release the supporting steel, and then sink the solidified soil blanket as a whole to the seabed and onto the annular steel bar net; Sink first and then fill: first insert a grouting pipe into the solidified soil blanket, then turn off the electric control magnet to release the supporting steel, sink the solidified soil blanket as a whole to the seabed and land on the annular steel bar mesh, and then fill the solidified soil into the solidified soil blanket through the grouting pipe.

8. The construction method for protecting the large-diameter steel pipe piles for scouring and solidifying soil for offshore wind turbines according to claim 7 is characterized in that: In the step 5, steel wire ropes are provided at both ends of the supporting steel, and the steel wire ropes are tied to the suspension bracket. The supporting steel is tied to the suspension bracket by setting the steel wire ropes to prevent the electric-controlled magnet from suddenly failing and causing the supporting steel to detach and lose support for the solidified soil. When the electric-controlled magnet is turned off, the steel wire rope is untied from the suspension bracket.

9. Offshore wind turbine large diameter steel pipe pile scouring solidification soil protection, characterized in that: Obtained by the method according to any one of claims 1 to 8.

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