Increased Cross-Section of Offshore Wind Turbine Tubular Piles - Solidified Soil Erosion Protection Structure and Construction Method

Abstract

The present invention relates to a structure for increasing the cross-section of an offshore wind turbine pile and protecting against scour by solidified soil, as well as a construction method, which includes the following steps: installation and fixation of a solidified soil pouring device, installation of a double-layer steel sleeve, installation of a grouting pipe, injection of slightly expanded cement slurry, and driving of a reinforced steel pile. The beneficial effects of the present invention are as follows: a solidified soil pouring device is proposed, which can effectively improve the pouring efficiency of solidified soil through synchronous pouring of multiple pipes. The outer hoop rotates along the wind turbine pile, which is beneficial to the leveling of solidified soil. In addition, the flow rate of solidified soil in the pouring pipe can be reasonably controlled according to the depth of the scour pit detected by the ultra-deep probe to ensure the flatness after the scour pit is filled, providing a stable and reliable foundation for the installation of the bottom protection structure in the later stage. By setting a bottom protection structure at the bottom of the wind turbine pile, the cross-sectional area of the bottom of the wind turbine pile is increased, which can effectively reinforce the bottom of the wind turbine pile, repair the pile diseases caused by previous scour, and extend the service life of the wind turbine pile.

Description

Technical Field

[0001] The invention belongs to the field of construction for scour reinforcement of offshore wind turbine piles, and particularly relates to a structure and construction method for increasing the cross-section of an offshore wind turbine pile and protecting it from scour with solidified soil. Background Art

[0002] Under the long-term scouring action of ocean currents, scour pits are formed on the seabed at the bottom of offshore wind turbine piles, affecting the safety of the wind turbine piles. Additionally, once the scour pits are formed, the scouring action is likely to be further intensified, thus affecting the structural safety of the wind turbine piles. Therefore, how to effectively reinforce the wind turbine piles is the key to ensuring the stable operation of offshore wind farms.

[0003] Existing reinforcement techniques mainly include measures such as pouring solidified soil around the wind turbine piles, dumping crushed stones, and laying solidified soil blankets. Although this method can effectively prevent the expansion of scour pits, it has little effect on reinforcing structurally damaged wind turbine piles. Moreover, the flatness of the underwater poured solidified soil is poor, and it is difficult to guarantee the construction quality. Under the scouring action of water flow, the poured solidified soil is easily washed away. Summary of the Invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art and provide a structure and construction method for increasing the cross-section of an offshore wind turbine pile and protecting it from scour with solidified soil.

[0005] The construction method of this structure for increasing the cross-section of an offshore wind turbine pile and protecting it from scour with solidified soil includes the following construction steps:

[0006] Step 1: Installation and fixation of the solidified soil pouring device: Install the solidified soil pouring device on the wind turbine pile, and pump the solidified soil into the scour pit at the bottom of the seabed through the pouring pipe.

[0007] Step 2: Installation of the double-layer steel sleeve: Put the double-layer steel sleeve in the pile bottom protection structure on the wind turbine pile, weld a bottom plate at the bottom of the double-layer steel sleeve, install and tie a steel bar mesh inside, and weld a top plate at the top.

[0008] Step 3: Installation of the grouting pipe: Install the grouting pipe on the grouting hole of the top plate, extract the circular floating block, and sink the pile bottom protection structure into the seabed.

[0009] Step 4: Injection of slightly expanded cement slurry: Inject slightly expanded cement slurry into the double-layer steel sleeve through the grouting pipe.

[0010] Step 5: Driving the reinforcement steel pile: Drive the reinforcement steel pile through the steel casing and into the seabed.

[0011] Preferably, in step one: the solidified soil pouring device includes an inner hoop, an outer hoop, a support rod, a pulley and a positioning sleeve; the inner hoop is semicircular, and the two inner hoop are combined with the sleeve hoop on the fan pipe pile, and a channel steel track is arranged around the outer side of the inner hoop, and the outer hoop is in a circular ring shape, and then the outer hoop is sleeved on the outer side of the inner hoop, one end of the support rod is fixed to the outer hoop, and the other end is provided with a pulley, and the pulley is supported in the channel steel track, the positioning sleeve is vertically fixed to the support rod, and then the casting pipe is inserted into the water from the positioning sleeve respectively.

[0012] Preferably, in step one: the solidified soil pouring device also includes an ultrasonic probe, which is turned on to detect the depth of the scouring pit, and the pumping amount of the solidified soil in the pouring pipe is controlled according to the depth of the scouring pit, until the poured solidified soil in the scouring pit is flush with the seabed surface; the outer clamp is rotated along the wind turbine pipe pile until the scouring pit is filled and leveled, and then the solidified soil pouring device is removed from the wind turbine pipe pile.

[0013] Preferably, step two is specifically as follows: the pile bottom protection structure includes a double-layer steel sleeve, a bottom plate, a top plate and a steel casing, the double-layer steel sleeve, the bottom plate and the top plate each include two symmetrical semi-annular structures, and the outer end of each semi-annular structure of the double-layer steel sleeve is provided with a docking ear plate; the two symmetrical semi-annular double-layer steel sleeves are put on the fan pipe pile and temporarily fixed by the docking ear plate, and then the bottom plate is welded and fixed at the bottom of the double-layer steel sleeve, and the steel mesh is tied and installed in the double-layer steel sleeve; the top plate is welded to the top of the double-layer steel sleeve.

[0014] Preferably, a grouting hole is provided on the top plate, the grouting hole is connected to the grouting pipe, and the circular floating block is arranged in the steel casing. Step two specifically comprises: installing the grouting pipe on the grouting hole of the top plate, plugging and connecting the grouting pipe to the grouting hole, then pulling out the circular floating block in the steel casing, sinking the pile bottom protection structure into the seabed along the wind turbine pipe pile, and clamping it on the bottom of the wind turbine pipe pile.

[0015] Preferably, in step 4: the injection of the micro-expansive cement slurry follows the principle of dual control of pressure and flow rate, that is, until both the pressure and flow rate exceed the design values, the grouting operation is stopped and the grouting pipe is pulled out.

[0016] Preferably, in step five: after the micro-expanding cement slurry reaches the designed strength, the reinforcement steel piles are inserted into the steel casing, and the bottom ends of the reinforcement steel piles are driven into the seabed through the solidified soil in the scouring pit.

[0017] An offshore wind turbine pipe pile with increased cross-section and solidified soil scour protection structure is obtained by any of the above methods.

[0018] The beneficial effects of the present invention are:

[0019] 1) The present invention provides a device for pouring solidified soil. Through synchronous pouring with multiple pipes, the pouring efficiency of solidified soil can be effectively improved. The outer hoop rotates along the wind turbine pipe pile, which is beneficial to leveling the solidified soil. In addition, according to the depth of the scour pit detected by the ultra-deep probe, the flow rate of the solidified soil in the pouring pipe can be reasonably controlled to ensure the flatness after filling the scour pit, providing a stable and reliable foundation for the installation of the pile bottom protection structure in the later stage.

[0020] 2) By setting a pile bottom protection structure at the bottom of the wind turbine pipe pile, the present invention increases the cross-sectional area of the bottom of the wind turbine pipe pile, can effectively reinforce the bottom of the wind turbine pipe pile, repair the pile diseases caused by previous scouring, and extend the service life of the wind turbine pipe pile.

[0021] 3) The pile bottom protection structure of the present invention adopts a structural form of double-layer steel sleeve + steel mesh + slightly expanded cement slurry, which can effectively enhance the hoop effect of the pile bottom protection structure on the wind turbine pipe pile and ensure the reinforcement effect.

[0022] 4) By driving reinforcement steel piles into the steel casing of the pile bottom protection structure, the present invention can effectively improve the bonding strength between the pile bottom protection structure and the seabed, provide a stable and reliable supporting effect for the wind turbine pipe pile, and ensure the structural safety of the wind turbine pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of pouring solidified soil into the scour pit of the wind turbine pipe pile;

[0024] Figure 2 is a top view of the device for pouring solidified soil into the scour pit;

[0025] Figure 3 is a schematic diagram when the reinforcement steel pile is not inserted into the pile bottom protection structure;

[0026] Figure 4 is a schematic diagram when the reinforcement steel pile is inserted into the pile bottom protection structure;

[0027] Figure 5 is a three-dimensional structure schematic diagram of the double-layer steel sleeve;

[0028] Figure 6 is a three-dimensional structure schematic diagram of the top plate;

[0029] Figure 7 is a schematic diagram of the butt joint of the double-layer steel sleeve;

[0030] Figure 8 is a schematic diagram of the installation of the steel mesh;

[0031] Figure 9 Schematic diagram of the installation of the top plate and the grouting pipe;

[0032] Figure 10 Three-dimensional structure schematic diagram of the pile bottom protection structure.

[0033] Description of the reference numerals: 11 - wind turbine pipe pile, 12 - seabed, 13 - scouring pit, 21 - inner hoop, 22 - channel steel track, 23 - outer hoop, 24 - foam floating block, 25 - support rod, 26 - pulley, 27 - positioning sleeve, 28 - ultrasonic probe, 31 - pouring pipe, 32 - solidified soil, 41 - double - layer steel sleeve, 42 - bottom plate, 43 - top plate, 44 - steel casing, 45 - circular floating block, 46 - docking ear plate, 47 - grouting hole, 48 - steel bar mesh, 51 - grouting pipe, 52 - slightly expanded cement slurry, 6 - reinforced steel pile. Detailed implementation manners

[0034] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand 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 modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0035] Embodiment 1

[0036] As an embodiment, this offshore wind turbine pipe pile enlarged cross - section - solidified soil scouring protection structure includes solidified soil 32, a pile bottom protection structure, and a reinforced steel pile 6.

[0037] As Figure 1 shown, the solidified soil 32 is poured into the scouring pit 13 at the bottom of the wind turbine pipe pile 11 through a solidified soil pouring device; the upper surface of the solidified soil 32 is flush with the surface of the seabed 12 on the periphery of the wind turbine pipe pile 11. When pouring the solidified soil 32, the solidified soil pouring device is fixed on the wind turbine pipe pile 11.

[0038] The pile bottom protection structure includes a double - layer steel sleeve 41, a bottom plate 42, a top plate 43, and a steel casing 44. The double - layer steel sleeve 41 is fixed on the bottom plate 42, the steel casing 44 is fixed on the bottom plate 42, the top plate 43 is fixed on the top of the double - layer steel sleeve 41. The double - layer steel sleeve 41 is provided with a steel bar mesh 48 and filled with slightly expanded cement slurry 52. The double - layer steel sleeve 41 is sleeved on the bottom of the wind turbine pipe pile 11 and supported on the poured solidified soil 32.

[0039] A circular floating block 45 is arranged inside the steel casing 44. The circular floating block 45 can effectively prevent the pile bottom protection structure from sinking into the water before the double - layer steel sleeve 41 is welded into a ring, the steel bar mesh 48 is tied and fixed, and the top plate 43 is welded and fixed. After the above - mentioned structure is completed, the circular floating block 45 is drawn out, so that the pile bottom protection structure sinks onto the seabed 12 and is sleeved on the bottom of the wind turbine pipe pile 11.

[0040] The reinforced steel pile 6 passes through the steel casing 44 on the pile bottom protection structure, and the bottom end penetrates through the solidified soil 32 in the scouring pit 13 and is driven into the seabed 12.

[0041] Embodiment 2

[0042] As another embodiment, this second embodiment is proposed on the basis of the first embodiment, and a more specific offshore wind turbine pile enlarged cross-section-solidified soil scour protection structure is provided:

[0043] As shown in Figure 2 Figure [not shown], the solidified soil pouring device includes an inner hoop 21, an outer hoop 23, a support rod 25, a pulley 26 and a positioning sleeve 27; the inner hoop 21 is semicircular, and two inner hoops 21 are sleeved on the wind turbine pile 11. A channel steel track 22 is arranged around the outer side of the inner hoop 21. The outer hoop 23 is circular, and the outer hoop 23 is sleeved outside the inner hoop 21. One end of the support rod 25 is fixed to the outer hoop 23, and the other end is provided with a pulley 26. The pulley 26 is supported in the channel steel track 22. The positioning sleeves 27 are vertically fixed on the support rod 25 at equal intervals. A pouring pipe 31 is arranged in the positioning sleeve 27 of the solidified soil pouring device, and the solidified soil 32 is poured into the scour pit 13 through the pouring pipe 31.

[0044] The solidified soil pouring device is provided with foam float blocks 24 and ultrasonic probes 28. The foam float blocks 24 are arranged circumferentially along the inner side of the outer hoop 23. By providing the foam float blocks 24, buoyancy is provided to prevent the solidified soil pouring device from sinking into the water; the ultrasonic probe 28 is fixed below the support rod 25, and the pouring condition of the scour pit 13 is detected by the ultrasonic probe 28 to avoid uneven pouring of the solidified soil 32.

[0045] As shown in Figures 3 to 8 Figure [not shown], the double-layer steel sleeve 41, the bottom plate 42 and the top plate 43 each include two symmetrical semi-circular structures. The outer end of each semi-circular structure of the double-layer steel sleeve 41 is provided with a docking ear plate 46, and the two circular structures of the double-layer steel sleeve 41 are spliced and fixed to each other through the docking ear plates 46.

[0046] The top plate 43 is provided with grouting holes 47, and the grouting holes 47 are docked with the grouting pipes 51, and the slightly expanded cement slurry 52 is injected into the double-layer steel sleeve 41 through the grouting pipes 51.

[0047] It should be noted that the same or similar parts in this embodiment and the first embodiment can be referred to each other, and will not be described in detail in this application.

[0048] Embodiment Three

[0049] As another embodiment, this third embodiment is proposed on the basis of the first and second embodiments. A construction method of this offshore wind turbine pile enlarged cross-section-solidified soil scour protection structure includes the following construction steps:

[0050] Step 1. Installation and fixation of the solidified soil pouring device: Install the inner hoop 21 on the wind turbine pipe pile 11, then put the outer hoop 23 on the outside of the inner hoop 21, and make the pulley 26 support in the channel steel track 22. Then insert the pouring pipes 31 into the water through the positioning sleeves 27 respectively.

[0051] Pouring of solidified soil 32 in the scouring pit 13: Pump the solidified soil 32 into the scouring pit 13 at the bottom of the seabed 12 through the pouring pipes 31, and turn on the ultrasonic probe 28 to detect the depth of the scouring pit 13. When the scouring pit 13 is deeper, increase the pumping volume of the solidified soil 32 in the pouring pipes 31; when the scouring pit 13 is shallower, reduce the pumping volume of the solidified soil 32 in the pouring pipes 31, so that the poured solidified soil 32 in the scouring pit 13 is flush with the surface of the seabed 12; Rotate the outer hoop 23 along the wind turbine pipe pile 11 until the scouring pit 13 is filled and leveled, and then remove the solidified soil pouring device from the wind turbine pipe pile 11.

[0052] Step 2. Installation of the double-layer steel sleeve 41: As Figure 5 shown, put the two semi-circular double-layer steel sleeves 41 on the wind turbine pipe pile 11 and temporarily fix them through the docking ear plates 46, and then weld the double-layer steel sleeve 41 and the bottom plate 42 into a ring;

[0053] Installation of the steel bar mesh 48: Install and tie the steel bar mesh 48 inside the double-layer steel sleeve 41;

[0054] Installation of the top plate 43: Weld the two semi-circular top plates 43 to the top of the double-layer steel sleeve 41.

[0055] Step 3. Installation of the grouting pipe 51: As Figure 9 and Figure 10 shown, install the grouting pipe 51 on the grouting hole 47 of the top plate 43. The grouting pipe 51 is connected to the grouting hole 47 by plug-in connection. Then draw out the circular floating block 45 in the steel casing 44, and sink the pile bottom protection structure along the wind turbine pipe pile 11 onto the seabed 12 and hoop it around the bottom of the wind turbine pipe pile 11.

[0056] Step 4. Injection of the slightly expanded cement slurry 52: Inject the slightly expanded cement slurry 52 into the double-layer steel sleeve 41 through the grouting pipe 51. The injection of the slightly expanded cement slurry 52 follows the principle of double control of pressure and flow rate. Stop the grouting operation until both the pressure and the flow rate exceed the design values, and then pull out the grouting pipe 51.

[0057] Step 5. Driving of the reinforcement steel pile 6: After the slightly expanded cement slurry 52 reaches the design strength, drive the reinforcement steel pile 6 through the steel casing 44 and into the seabed 12.

[0058] It should be noted that the same or similar parts in this embodiment and Embodiments 1 and 2 can be referred to each other and will not be elaborated in this application.

[0059] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

Claims

1. Construction method of a construction method for increasing cross-section and solidified soil scour protection structure of an offshore wind turbine pipe pile, characterized in that The construction steps include: Step 1: Install and fix the solidified soil pouring device: install the solidified soil pouring device on the wind turbine pile, and pump the solidified soil into the scouring pit at the bottom of the seabed through the pouring pipe; Step 2: Double-layer steel sleeve installation: Put the double-layer steel sleeve in the pile bottom protection structure on the fan pile, weld the bottom plate at the bottom of the double-layer steel sleeve, install the steel mesh inside, and weld the top plate on the top; Step 3: Installation of grouting pipe: install the grouting pipe on the grouting hole of the top plate, extract the circular floating block, and sink the pile bottom protection structure into the seabed; Step 4: Injecting micro-expansion cement slurry: injecting micro-expansion cement slurry into the double-layer steel sleeve through the grouting pipe; Step 5: Driving the reinforcement steel piles: Pass the reinforcement steel piles through the steel casing and drive them into the seabed; In step 1: the solidified soil pouring device comprises an inner hoop, an outer hoop, a support rod, a pulley and a positioning sleeve; the inner hoop is semicircular, two inner hoop are combined with the sleeve hoop on the fan pipe pile, a channel steel track is arranged around the outer side of the inner hoop, the outer hoop is annular, and then the outer hoop is sleeved on the outer side of the inner hoop, one end of the support rod is fixed to the outer hoop, and the other end is provided with a pulley, and the pulley is supported in the channel steel track, the positioning sleeve is vertically fixed to the support rod, and then the pouring pipe is respectively inserted into the water from the positioning sleeve; In step 1: the solidified soil pouring device also includes an ultrasonic probe, which is turned on to detect the depth of the scouring pit, and the pumping amount of the solidified soil in the pouring pipe is controlled according to the depth of the scouring pit, until the poured solidified soil in the scouring pit is flush with the seabed surface; the outer clamp is rotated along the wind turbine pile until the scouring pit is filled and leveled, and then the solidified soil pouring device is removed from the wind turbine pile; Step 2 is specifically as follows: the pile bottom protection structure includes a double-layer steel sleeve, a bottom plate, a top plate and a steel casing, and the double-layer steel sleeve, the bottom plate and the top plate all include two symmetrical semi-annular structures, and the outer end of each semi-annular structure of the double-layer steel sleeve is provided with a docking ear plate; the two symmetrical semi-annular double-layer steel sleeves are sleeved on the fan pipe pile and temporarily fixed by the docking ear plate, and then the bottom plate is welded and fixed at the bottom of the double-layer steel sleeve, and the steel mesh is tied and installed in the double-layer steel sleeve; the top plate is welded to the top of the double-layer steel sleeve; The top plate is provided with a grouting hole, the grouting hole is connected to the grouting pipe, and the circular floating block is arranged in the steel casing. The step two is specifically: the grouting pipe is installed on the grouting hole of the top plate, the grouting pipe is plugged and connected to the grouting hole, and then the circular floating block in the steel casing is pulled out, and the pile bottom protection structure is sunk into the seabed along the wind turbine pipe pile, and the hoop is clamped on the bottom of the wind turbine pipe pile.

2. The construction method of the offshore wind turbine pipe pile enlarged cross-section - solidified soil scour protection structure according to claim 1, characterized in that In step 4: the injection of micro-expansive cement slurry follows the principle of dual control of pressure and flow, that is, until the pressure and flow exceed the design value, the grouting operation is stopped and the grouting pipe is pulled out.

3. The construction method of the offshore wind turbine pipe pile enlarged cross-section - solidified soil scour protection structure according to claim 1, characterized in that, In step five: after the micro-expanding cement slurry reaches the designed strength, the reinforcement steel piles are inserted into the steel casing, and the bottom ends of the reinforcement steel piles are driven into the seabed through the solidified soil in the scouring pit.

4. Increased cross-section of the offshore wind turbine pile - solidified soil scour protection structure, characterized in that, Obtained by the method according to any one of claims 1 to 3.

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