Construction method for scour protection of large diameter steel pipe piles pumped to solidify soil for offshore wind turbines

Abstract

The invention relates to a construction method for scour protection of large-diameter steel pipe pile pumped solidified soil for offshore wind turbines. By means of a symmetrical pumping device for fluidized solidified soil fixed to the steel pipe pile, fluidized solidified soil can be pumped at different positions in a scour pit, thereby realizing intelligent construction of fluidized solidified soil pumping and improving construction efficiency of fluidized solidified soil pumping. A layered flexible reinforcement sinking device is adopted, and automatic unhooking of a suspension rope is realized by controlling a telescopic rod of an oil cylinder, and net bag crushed stones are adopted to complete the sinking construction of a geogrid, so as to achieve the effect of layered flexible reinforcement of fluidized solidified soil and improve the effect of scour protection of solidified soil at the same time. The composite sand blowing bag-solidified soil retaining ring combined protection technology adopts a method of throwing and filling bagged solidified soil in combination with pumping solidified soil to form a solidified soil retaining ring, which has a good anti-scour effect and is convenient and efficient in construction.

Description

Technical Field

[0001] The invention belongs to the field of foundation engineering, and in particular relates to a construction method for scour protection of large-diameter steel pipe piles pumped to solidify soil for offshore wind turbines. Background Art

[0002] Offshore wind energy is an important topic in the development of marine resources. Large-diameter single pile foundations are widely used as the foundation of offshore wind turbine projects due to their good bearing capacity. However, since the pile foundation will be scoured by the water flow, eddies will form around the pile foundation, causing local scouring of the soil around the pile foundation and forming scouring pits. If the water flow is allowed to scour, it will seriously affect the bearing capacity of the pile foundation and reduce the safety of the wind turbine. At present, the traditional solidified soil scour protection construction effect is poor and the protection period is short. Therefore, for the problems existing in the scour protection construction of offshore wind turbine pile foundations, a simple and efficient construction method is urgently needed. Summary of the invention

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

[0004] The offshore wind turbine large-diameter steel pipe pile pumping solidified soil scour protection construction method comprises the following steps:

[0005] S1. Install and fix the symmetrical pumping device on the fluidized solidified soil of the steel pipe pile: assemble the positioning pile body pumping pipe in sections and fix it on the steel pipe pile by energizing the electromagnet. Assemble the last section of the pile body pumping pipe with the bottom adjustable pumping device; connect the pile body pumping pipe with the pumping pipe of the pumping device on the construction ship, and connect the communication line;

[0006] S2, lowering sandbags to the flushing position through the layered flexible reinforcement sinking device;

[0007] S3, pumping fluidized solidified soil into the scouring pit through the bottom adjustable pumping device, lowering geogrids and net bag gravel through the layered flexible reinforcement sinking device for circulation until the scouring pit is backfilled and leveled;

[0008] S4. After the fluidized solidified soil in the flushing pit hardens, the bagged solidified soil is thrown around the piles, and after the throwing and filling is completed, the fluidized solidified soil is pumped;

[0009] S5. Construct a solidified soil retaining ring or a composite seaweed solidified soil retaining ring on the top of the scouring pit.

[0010] Preferably, a rotating mechanism is provided at the connection between the bottom adjustable pumping device and the pile body pumping pipe; a hose, a support arm and a cylinder are provided at the bending part of the bottom adjustable pumping device, and the lifting and lowering of the bottom adjustable pumping device are realized by retracting and extending the support arm; a telescopic sleeve is installed at the outlet end of the bottom adjustable pumping device, a roller is provided on the surface of the bottom adjustable pumping device, a steel wire rope is provided between the roller and the end of the telescopic sleeve, and the telescopic sleeve retracts and contracts when the roller retracts and releases the steel wire rope; a wide-angle camera is provided at the bottom end of the telescopic sleeve for confirming the pumping position.

[0011] Preferably, step S1 is specifically as follows: assemble the pile body pumping pipe segments and the electromagnet on the transport ship, and pre-assemble the last section of the pile body pumping pipe and the bottom adjustable pumping device together; install the steel pipe pile clamp above the water surface of the steel pipe pile, arrange divers to go into the water to clean the steel pipe pile and preset the installation position of the electromagnet; install the pile body pumping pipe in sections, and energize and fix the electromagnet after each section is assembled and positioned; connect the pile body pumping pipe to the pumping pipe of the pumping device on the construction ship, and connect the communication line between the wide-angle camera and the construction ship.

[0012] Preferably, the layered flexible reinforcement sinking device includes an I-beam support, on which are disposed a plurality of groups of oil cylinders, and the lower part of the I-beam support is provided with a geogrid and bagged net gravel via a lifting rope; an I-beam support groove is provided at a position corresponding to the bottom of the I-beam support and the oil cylinder piston rod, and the lifting rope passes through the I-beam support groove; a baffle is provided on the I-beam support, and when the oil cylinder piston rod is extended, it abuts against the baffle, and the upper end of the lifting rope passes through the oil cylinder piston rod, and when the oil cylinder piston rod is retracted, the lifting rope and the geogrid are automatically unhooked.

[0013] Preferably, in step S4, the geogrid and the net bag of gravel are connected, the lifting rope above the geogrid is tied and buckled on the piston rod of the oil cylinder to push the piston rod out; the I-beam support is lowered to the top of the flushing pit through the lifting rope and the hook of the I-beam support, and the piston rod is controlled to be retracted to unhook the geogrid, so that the geogrid and the net bag of gravel fall into the flushing pit.

[0014] Preferably, step S6 specifically comprises adopting a composite sand blowing bag-solidified soil retaining ring combined protection technology, wherein each time a certain amount of bagged solidified soil is thrown in, a certain amount of fluidized solidified soil is pumped between the bags, and the bagged solidified soil is connected to form a solidified soil retaining ring.

[0015] Preferably, step S6 is to adopt a composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection technology, and to place living seaweed sandbags or seaweed seed sandbags on the top layer of the scouring pit through a layered flexible reinforced sinking device to form a composite seaweed solidified soil retaining ring.

[0016] Preferably, after constructing the solidified soil retaining ring or the composite seaweed solidified soil retaining ring, the bottom adjustable pumping device is removed and the segment pile body pumping pipe is recovered.

[0017] The large-diameter steel pipe pile pumping solidified soil scour protection structure for offshore wind turbines is obtained by any of the above-mentioned methods.

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

[0019] 1) The present invention can pump the fluidized solidified soil to different positions in the flushing pit through the symmetrical fluidized solidified soil pumping device fixed on the steel pipe pile, thereby realizing the intelligent construction of fluidized solidified soil pumping and improving the construction efficiency of fluidized solidified soil pumping.

[0020] 2) The present invention adopts a layered flexible reinforcement sinking device, which realizes the automatic unhooking of the suspension rope by controlling the telescopic rod of the oil cylinder, and uses a net bag and gravel to complete the geogrid sinking construction, so as to achieve the effect of layered flexible reinforcement of fluidized solidified soil and improve the effect of scour protection of solidified soil.

[0021] 3) The composite sand blowing bag-solidified soil retaining ring combined protection technology of the present invention adopts the method of throwing bagged solidified soil in combination with pumping solidified soil to form a solidified soil retaining ring, which has good anti-scouring effect and is convenient and efficient to construct.

[0022] 4) The composite blowing sandbag-solidified soil retaining ring-bionic seaweed combined protection technology of the present invention lays a layer of seaweed sandbags on the basis of the composite blowing sandbag-solidified soil retaining ring, reduces the scouring effect of water flow through the planted seaweed, and significantly improves the anti-scouring effect of the solidified soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a symmetrical pumping device for fluidized solidified soil fixed on a steel pipe pile;

[0024] Figure 2 It is a schematic diagram of the structure of the bottom adjustable pumping device;

[0025] Figure 3 This is a schematic diagram of the structure of the layered flexible reinforcement sinking device;

[0026] Figure 4 This is a detailed structural diagram of the layered flexible reinforcement sinking device;

[0027] Figure 5 It is a schematic diagram of a composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection structure;

[0028] Figure 6 It is a schematic diagram of using living seaweed sandbags in the composite protective structure of composite blowing sandbag-solidified soil retaining ring-bionic seaweed sandbag;

[0029] Figure 7 A schematic diagram of using seaweed seed sandbags in a composite sand blowing bag-solidified soil retaining ring-bionic seaweed sandbag combined protection structure;

[0030] Figure 8 It is a schematic diagram of the composite sand-blowing bag-solidified soil retaining ring combined protection structure.

[0031] Explanation of reference numerals: 1 construction ship, 2 pumping device, 3 pumping pipe, 4 steel pipe pile, 5 steel pipe pile clamp, 6 communication line, 7 bottom adjustable pumping device, 8 flushing pit, 9 seabed, 10 pile body pumping pipe, 11 electromagnet, 12 rotating mechanism, 13 hose, 15 cylinder, 16 roller, 17 wire rope, 18 telescopic sleeve, 19 wide-angle camera, 20 hook, 21 I-beam support rope, 22 I-beam support, 24 rope, 25 net bag gravel, 26 geogrid, 28 I-beam support groove, 29 baffle, 30 composite seaweed solidified soil retaining ring, 31 fluidized solidified soil, 32 geogrid, 33 sandbag, 34 bagged solidified soil, 35 living seaweed sandbag, 36 seaweed, 37 seaweed seed sandbag, 38 Solidify the soil retaining ring. DETAILED DESCRIPTION

[0032] 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.

[0033] Embodiment 1

[0034] As an embodiment, the offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method includes the following steps:

[0035] S1. Install and fix the symmetrical pumping device on the fluidized solidified soil of the steel pipe pile. Assemble the segmented pile body pumping pipe 10 and the electromagnet 11 on the transport ship 1, and pre-assemble the last section of the pumping pipe with the bottom adjustable pumping device 7; install the steel pipe pile clamp 5 above the water surface of the steel pipe pile 4, and arrange divers to go into the water to clean the installation position of the preset electromagnet 11 on the steel pipe pile 4; install the pile body pumping pipe 10 in sections, and energize and fix the electromagnet 11 after each section is assembled and positioned; connect the pile body pumping pipe 10 to the pumping pipe 3 of the pumping device 2 on the construction ship 1, and connect the communication line 6.

[0036] S2, mixing the fluidized solidified soil 31, and putting part of it into woven bags; at the same time, sowing seaweed seeds in the sandbags 37 in advance, or planting living seaweed on the sandbags, and placing them in seawater for cultivation.

[0037] S3. Determine the specifications of the I-beam support 22 according to the size of the punching hole 7, and assemble and weld the I-beam support 22 on the construction ship 1; install the oil cylinder 15, the baffle 29, and the communication line 6, and groove the I-beam.

[0038] S4, install and tie the sandbags 33, and use the I-beam support 22 to lower the sandbags to the flushing pit 8 position through the suspension rope 24.

[0039] S5, pump a certain thickness of fluidized solidified soil, and adjust the pumping position of the fluidized solidified soil through the wide-angle camera 19 during the pumping process; install the geogrid 26 and the net bag gravel 25, tie the suspension rope 24 and buckle it on the piston rod of the oil cylinder 15, and push the piston rod out; lower the I-beam support 22 to the top of the scouring pit through the I-beam support suspension rope 21 and the hook 20, and control the retraction of the piston rod to unhook the geogrid 26. This cycle is repeated until the scouring pit is backfilled and leveled.

[0040] S6. After the fluidized solidified soil in the flushing pit has hardened to a certain strength, bagged solidified soil 34 is thrown around the pile. After the throwing is completed, a certain amount of fluidized solidified soil 31 is pumped.

[0041] Choose different retaining ring forms according to the construction situation.

[0042] Embodiment 2

[0043] As another embodiment, this embodiment 2 proposes, on the basis of the embodiment 1, a more specific offshore wind turbine large-diameter steel pipe pile pumping solidified soil scour protection construction method, which selects different retaining ring forms for construction according to the construction situation, including two specific types:

[0044] 1. A composite sand blowing bag-solidified soil retaining ring combined protection technology is adopted. After each certain amount of bagged solidified soil 34 is dumped, a certain amount of fluidized solidified soil 31 is pumped between the bags to connect the bagged solidified soil to form an integral composite sand blowing bag-solidified soil retaining ring.

[0045] Second, a composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection technology is used to hang and place the living seaweed sandbag 35 or the seaweed seed sandbag 37 through the I-beam support 22.

[0046] After the retaining ring construction is completed, the bottom adjustable pumping device 7 is removed and the segment pile body pumping pipe 10 is recovered.

[0047] 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.

[0048] Embodiment 3

[0049] As another embodiment, this embodiment three is proposed on the basis of embodiments one and two. The offshore wind turbine large-diameter steel pipe pile pumping solidified soil scour protection system obtained by this construction method includes a symmetrical pumping device of fluidized solidified soil fixed to the steel pipe piles, a layered flexible reinforced sinking device, and a composite sand blowing bag-solidified soil retaining ring combined protection technology and a composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection technology.

[0050] like Figure 1 and 2 As shown, the symmetrical pumping device for fluidized solidified soil fixed on the steel pipe pile includes a pumping device 2 arranged on a construction ship 1, and the prepared fluidized solidified soil is pumped into the flushing pit 8 through a pumping pipe 3 arranged around the steel pipe pile 4 and a bottom adjustable pumping device 7. The bottom adjustable pumping device 7 is installed under the pile body pumping pipe 10, and is provided with a rotating mechanism 12, a hose 13, a support arm 14, a cylinder 15, a roller 16, a steel wire rope 17, and a telescopic sleeve 18. The bottom adjustable pumping device 7 can rotate the pumping pipe 3 to a certain angle through the rotating mechanism 12; a hose 13, a support arm 14, and a cylinder 15 are provided at the bend of the pumping pipe 3, and the pumping pipe 3 can be lifted and lowered by retracting the cylinder 15; a telescopic sleeve 18 is installed at the bottom of the pumping pipe 3, and a roller 16 is used to retract and extend the wire rope 17 to realize the retraction and extension of the telescopic sleeve 18; a wide-angle camera 19 is provided at the bottom of the telescopic sleeve 18, which can view the pumping status of the fluidized solidified soil in real time, so as to adjust the position of the pumping pipe accordingly, thereby improving the pumping construction quality of the fluidized solidified soil.

[0051] like Figure 3 and 4 As shown, the layered flexible reinforcement sinking device includes a support suspension rope 21, an I-beam support 22, a cylinder 15, a communication line 6, a baffle 29 and a suspension rope; an I-beam support groove 28 is provided at the position of the piston rod of the cylinder 15 on the I-beam support 22 for installing the suspension rope. The layered flexible reinforcement sinking device includes multiple groups of cylinders 15 arranged on the I-beam support 22, and geogrids 26 and bagged net gravel 25 are installed at the lower part of the suspension rope 24 to realize the automatic sinking of the geogrid; the suspension rope 24 passes through the piston rod of the cylinder 15, and after the I-beam support 22 is lowered to a certain position, the piston rod of the cylinder 15 is controlled to be retracted through the communication line 6, so that the geogrid can be automatically unhooked.

[0052] like Figure 5 and 6 As shown, the composite blowing sandbag-solidified soil retaining ring-bionic seaweed combined protection technology mainly includes: sandbags 33, fluidized solidified soil 31, geogrids 32, bagged solidified soil 34, and living seaweed sandbags 35 are arranged from bottom to top in the scouring pit 8 to form a composite seaweed solidified soil retaining ring 30.

[0053] like Figure 7 As shown, the composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection technology, considering the specific construction conditions, the living seaweed sandbag 35 can be replaced with a seaweed seed sandbag 37.

[0054] like Figure 8As shown, the composite sand blowing bag-solidified soil retaining ring combined protection technology includes: sandbags 33, fluidized solidified soil 31, geogrids 32, and bagged solidified soil 34 are respectively arranged from bottom to top in the scouring pit 8; after the scouring pit is backfilled with fluidized solidified soil 31 and hardened to a certain strength, a certain amount of bagged solidified soil 34 is thrown on it, and then fluidized solidified soil is pumped between the bagged solidified soil to form a solidified soil retaining ring of a certain range.

[0055] 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 scour protection of large-diameter steel pipe piles pumped to solidify soil for offshore wind turbines, characterized in that: The following steps are involved: S1. Install and fix the symmetrical pumping device on the fluidized solidified soil of the steel pipe pile: assemble the positioning pile body pumping pipe in sections, and fix it on the steel pipe pile by energizing the electromagnet, and assemble the last section of the pile body pumping pipe with the bottom adjustable pumping device; connect the pile body pumping pipe with the pumping pipe of the pumping device on the construction ship, and connect the communication line; a rotating mechanism is provided at the connection between the bottom adjustable pumping device and the pile body pumping pipe; a hose, a support arm and a cylinder are provided at the bend of the bottom adjustable pumping device, and the lifting and lowering of the bottom adjustable pumping device are realized by the extension and retraction of the support arm; a telescopic sleeve is installed at the outlet end of the bottom adjustable pumping device, and a roller is provided on the surface of the bottom adjustable pumping device, and the roller A steel wire rope is provided between the wheel and the end of the telescopic sleeve, and the telescopic sleeve is extended and retracted when the roller retracts and releases the steel wire rope; a wide-angle camera is provided at the bottom of the telescopic sleeve to confirm the pumping position; the pile body pumping pipe segments and electromagnets are assembled on the transport ship, and the last segment of the pile body pumping pipe is pre-assembled with the bottom adjustable pumping device; a steel pipe pile clamp is installed above the water surface of the steel pipe pile, and divers are arranged to go into the water to clean the steel pipe pile and preset the installation position of the electromagnet; the pile body pumping pipe is installed in sections, and the electromagnet is energized and fixed after each segment is assembled and positioned; the pile body pumping pipe is connected to the pumping pipe of the pumping device on the construction ship, and a communication line is connected between the wide-angle camera and the construction ship; S2, lowering sandbags to the flushing position through the layered flexible reinforcement sinking device; S3, pumping fluidized solidified soil into the scouring pit through the bottom adjustable pumping device, lowering geogrids and net bag gravel through the layered flexible reinforcement sinking device for circulation until the scouring pit is backfilled and leveled; S4. After the fluidized solidified soil in the flushing pit hardens, the bagged solidified soil is thrown around the piles, and after the throwing and filling is completed, the fluidized solidified soil is pumped; S5. Construct a solidified soil retaining ring or a composite seaweed solidified soil retaining ring on the top of the scouring pit.

2. The offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method according to claim 1 is characterized in that: The layered flexible reinforcement sinking device includes an I-beam support, on which are arranged a plurality of groups of oil cylinders, and the lower part of the I-beam support is installed with a geogrid and bagged net gravel through a lifting rope; an I-beam support groove is arranged at a position corresponding to the bottom of the I-beam support and the piston rod of the oil cylinder, and the lifting rope passes through the I-beam support groove; a baffle is provided on the I-beam support, and when the piston rod of the oil cylinder is extended, it abuts against the baffle, and the upper end of the lifting rope passes through the piston rod of the oil cylinder, and when the piston rod of the oil cylinder is retracted, the lifting rope and the geogrid are automatically unhooked.

3. The offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method according to claim 2 is characterized in that: In step S3, the geogrid and the net bag gravel are connected, the lifting rope above the geogrid is tied and buckled on the piston rod of the oil cylinder to push the piston rod out; the I-beam support is lowered to the top of the flushing pit through the I-beam support rope and hook, and the piston rod is controlled to be retracted to unhook the geogrid, so that the geogrid and the net bag gravel fall into the flushing pit.

4. The offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method according to claim 1 is characterized in that: Step S5 specifically comprises adopting a composite sand blowing bag-solidified soil retaining ring combined protection technology, each time a certain amount of bagged solidified soil is thrown in, a certain amount of fluidized solidified soil is pumped between the bags, and the bagged solidified soil is connected to form a solidified soil retaining ring.

5. The offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method according to claim 2 is characterized in that: Step S5 specifically adopts the composite sand blowing bag-solidified soil retaining ring-bionic seaweed combined protection technology, and hangs living seaweed sandbags or seaweed seed sandbags on the top layer of the scouring pit through a layered flexible reinforced sinking device to form a composite seaweed solidified soil retaining ring.

6. The offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection construction method according to claim 1 is characterized in that: After constructing the solidified soil retaining ring or the composite seaweed solidified soil retaining ring, remove the bottom adjustable pumping device and recover the segment pile body pumping pipe.

7. Offshore wind turbine large diameter steel pipe pile pumping solidified soil scour protection structure, characterized in that: Obtained by the method according to any one of claims 1 to 6.

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