Distributed torque-resistant single pile foundation for deepwater environment and implementation method of distributed torque-resistant single pile foundation

Abstract

The invention discloses a distributed anti-torque single pile foundation for a deepwater environment and an implementation method thereof.The distributed anti-torque single pile foundation comprises a pile foundation and a plurality of torque compensators fixed to the pile foundation at intervals, each torque compensator is provided with an air bag, and the air bags are connected with inflation pipes; the inflation pipe is connected with an inflation valve located on the top of the pile foundation. The inflated air bag can generate buoyancy and generate reverse torque at the joint of the corresponding torque compensator and the pile foundation. The bending resistance of the pile foundation can be remarkably improved, the water depth application bottleneck of the single-pile foundation is broken through, the applicable water depth of the single-pile foundation with the same diameter is increased, or the pile diameter is reduced under the condition of the same water depth.

Description

TECHNICAL FIELD

[0001] The present application relates to marine foundation engineering, in particular to a distributed moment resisting single pile foundation for deep water environment and an implementation method thereof. BACKGROUND

[0002] Single pile foundation is one of the mainstream offshore wind power foundation forms. The existing single pile foundation relies on the mechanical properties of the foundation structure itself to directly transmit external forces such as wind, wave and current to the foundation soil, and realizes the stability of the foundation and the upper structure through the bearing capacity of the soil. On the one hand, with the development of marine development from nearshore to deep sea, the traditional single pile foundation needs to increase the size of the foundation to resist wind, wave and current loads to meet the bearing capacity requirements, resulting in an increase in construction difficulty and cost. On the other hand, due to the performance limitation of the sinking equipment, there is an upper limit to the sinking size of the pipe pile. These factors lead to a bottleneck in the application of single pile foundation. SUMMARY

[0003] The first object of the present application is to provide a distributed moment resisting single pile foundation with good economic efficiency and capable of breaking through the water depth application bottleneck; the second object of the present application is to provide an implementation method of the distributed moment resisting single pile foundation.

[0004] Technical solution: The distributed moment resisting single pile foundation for deep water environment comprises a pile foundation and a plurality of moment compensators fixed at intervals on the pile foundation, the moment compensator has an air bag, the air bag is connected with an inflation pipe, and the inflation pipe is connected with an inflation valve located at the top of the pile foundation; the inflated air bag can generate buoyancy and generate a reverse moment at the connection between the corresponding moment compensator and the pile foundation.

[0005] Further, the moment compensator comprises a fixing ring, a moment transmission rod and an air bag plate, the fixing ring is fixed on the pile foundation, the moment transmission rod is connected with the fixing ring and the air bag plate at both ends, and the air bag is fixed on the air bag plate.

[0006] Further, a plurality of air bags are fixed side by side below the air bag plate, and each air bag is connected with the corresponding inflation valve at the top of the pile foundation through the inflation pipe.

[0007] Further, the air bag is locked on the air bag plate.

[0008] Further, the reverse moment M1 generated by a single moment compensator is determined by the following expression:

[0009] M1=F1×(B / 2+L1)

[0010] Wherein, F1 represents the total buoyancy generated by all air bags of the moment compensator, B represents the length of the air bag plate, and L1 represents the length of the moment transmission rod.

[0011] Further, F1 = p x V x g, wherein p represents seawater density, V represents the total displacement volume of all air bags of the moment compensator, and g represents gravitational acceleration.

[0012] Further, the moment transmission rod is welded to the fixing ring and the air bag plate at two ends, respectively.

[0013] Further, the inner diameter of the fixing ring is the same as the outer diameter of the pile foundation.

[0014] The embodiment method of the distributed moment-resistant single pile foundation comprises the following steps: the fixing ring is in a closed form and is fixed on the pile foundation in advance; before the pile foundation is sunk, all air bags on the moment compensators are connected to corresponding inflation valves on the top of the pile foundation through inflation pipes; after the pile foundation is sunk to the position, the moment compensators are installed to the position; the inflation valves are opened and the air bags are inflated through the inflation pipes; after a set amount of air is filled in each air bag, the installation is completed; and the amount of air is monitored through flow meters on the inflation pipes.

[0015] Optionally, the embodiment method of the distributed moment-resistant single pile foundation comprises the following steps: the fixing ring is in a split form, and inflation valves are arranged on the top of the existing pile foundation; all air bags on the moment compensators are connected to corresponding inflation valves on the top of the existing pile foundation through inflation pipes; then, the moment compensators are lowered to the designed depth, the fixing rings of the moment compensators are fixed on the pile foundation through bolts, and the installation of the moment compensators is completed; finally, the inflation valves are opened and the air bags are inflated through the inflation pipes; after a set amount of air is filled in each air bag, the installation is completed; and the amount of air is monitored through flow meters on the inflation pipes.

[0016] The fixing ring is designed in a split form, so that multiple moment compensators can be installed on the existing pile foundation, the bending resistance of the pile foundation is greatly improved, the safety reserve of the wind turbine generator is increased, and the long-term safe and stable operation of the wind turbine generator in a complex marine environment is ensured.

[0017] Advantages: Compared with the prior art, the present application has the following obvious advantages:

[0018] The present application can significantly improve the bending resistance of the pile foundation and break through the water depth application bottleneck of the single pile foundation. The traditional single pile foundation has limitations in bending resistance, and needs to increase the pile diameter to meet the application requirements in deep water areas. However, this scheme has significant disadvantages in economy and other aspects. The present application sets multiple moment compensators with air bags on the traditional single pile foundation, and the air bags provide a counteracting moment for the pile body through the buoyancy, which can significantly reduce the moment value at the connection position of the moment compensator and the pile foundation, so that the single pile foundation has stronger resistance to the moment. The present application enhances the bending resistance of the single pile foundation by setting the moment compensator, which can increase the applicable water depth of the single pile foundation with the same diameter, or reduce the pile diameter under the same water depth.

[0019] In summary, the application creatively proposes to generate additional bending moment by the buoyancy of the air bag on the single pile foundation, effectively resist the action of wind and wave load on the pile body, break through the inherent thinking of traditional single pile foundation relying on the bearing capacity of the foundation, and provide a new solution for the application of offshore wind power foundation in deep sea environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a structural schematic diagram of a distributed anti-moment single pile foundation for deep water environment provided by the embodiment of the application;

[0021] Fig. 2 is a working principle diagram of the moment compensator in the embodiment of the application;

[0022] Fig. 3 is a schematic diagram of the force of the wind turbine applying the distributed anti-moment single pile foundation. DETAILED DESCRIPTION

[0023] The application will be further described below with reference to the drawings.

[0024] ATTACHED Figs. 1 to 3 The reference signs in the drawings are as follows:

[0025] 1, pile foundation; 10, fixed ring; 2, moment compensator; 20, moment transmission rod; 21, air bag plate; 22, air bag.

[0026] Embodiment 1

[0027] As shown in Fig. 1 , embodiment 1 provides a distributed anti-moment single pile foundation for deep water environment, which comprises a pile foundation 1 and a plurality of moment compensators 2 fixed at intervals on the pile foundation 1.

[0028] The moment compensator 2 comprises a fixed ring 10, a moment transmission rod 20 and an air bag plate 21. The inner diameter of the fixed ring 10 is the same as the outer diameter of the pile foundation 1, and the fixed ring 10 is fixed on the pile foundation 1. The moment transmission rod 20 is welded and connected at both ends to the fixed ring 10 and the air bag plate 21 respectively. A plurality of air bags 22 are arranged side by side below the air bag plate 21 (the size of the air bag plate 21 needs to meet the requirement of covering the plurality of air bags 22 below it), and the air bags 22 are locked on the air bag plate 21. Each air bag 22 is connected with an inflation pipe, and all the inflation pipes are collected together along the pile foundation to the top of the pile foundation 1, that is, the wind turbine platform. Each air bag 22 is connected with a corresponding inflation valve at the top of the pile foundation 1 through the inflation pipe.

[0029] The moment compensator 2 transmits a reverse moment to the pile foundation 1 through the buoyancy generated by the air bags 22 in water, and the mechanical principle is as shown in Fig. 2 The reverse moment M1 generated by a single moment compensator 2 can reduce the moment value M at the connection position of the moment compensator and the pile foundation.

[0030] M1 = F1 x (B / 2 + L1)

[0031] Wherein, F1 represents the total buoyancy generated by all air bags 22 of the moment compensator 2, B represents the length of the air bag plate 21, and L1 represents the length of the moment transmission rod 20.

[0032] F1 = p x V x g, wherein p represents the density of seawater, V represents the total displacement volume of all air bags 22 of the moment compensator 2, and g represents the acceleration of gravity.

[0033] In the design, the length L1 of the moment transmission rod 20, the distribution number of the moment compensator 2, and the inflation volume of the air bag 22 can be increased according to the actual moment demand of the project.

[0034] The overall schematic view of the foundation and the fan is shown in Fig. 3 The moment compensator 2 is designed to be installed on the cantilever section of the pile foundation, and by arranging multiple moment compensators 2, the bending moment of the upper fan unit wind wave load and the cantilever section water flow load is reduced.

[0035] Embodiment 2

[0036] Embodiment 2 provides an implementation method of the distributed anti-moment single pile foundation described in embodiment 1, which is divided into two cases, one for the pile foundation 1 that needs to be sunk, and the other for the pile foundation 1 in service.

[0037] For the pile foundation 1 that needs to be sunk, the fixed ring 10 is designed in a closed form and is pre-welded on the pile foundation 1. Before the pile foundation 1 is sunk, all air bags 22 on each moment compensator 2 are connected to the corresponding inflation valve on the top of the pile foundation 1 through the inflation pipe. After the pile foundation 1 is sunk in place, each moment compensator 2 is installed in place. The inflation valve is opened and the air bags 22 are inflated through the inflation pipe. After a set amount of air is filled in each air bag 22, the installation is completed. The air volume is monitored by the flow meter on each inflation pipe.

[0038] For the pile foundation 1 in service, the fixed ring 10 is designed in a split form, and the inflation valve is arranged on the top of the pile foundation 1 in service. First, all air bags 22 on each moment compensator 2 are connected to the corresponding inflation valve on the top of the pile foundation 1 in service through the inflation pipe. Then, each moment compensator 2 is lowered to the designed depth, and a diver is sent to fix the fixed ring 10 of each moment compensator 2 on the pile foundation 1 by bolts, completing the installation of the moment compensator 2. Finally, the inflation valve is opened and the air bags 22 are inflated through the inflation pipe. After a set amount of air is filled in each air bag 22, the installation is completed. The air volume is monitored by the flow meter on each inflation pipe.

Claims

1. A distributed moment-resisting monopile foundation for deepwater environments, characterized in that: The invention comprises a pile foundation (1) and a plurality of moment compensators (2) fixed at intervals on the pile foundation (1). The moment compensator (2) has an air bag (22). An inflation tube is connected to the air bag (22). The inflation tube is connected to an inflation valve located at the top of the pile foundation (1). The inflated air bag (22) can generate buoyancy and generate a reverse torque at the connection between the moment compensator (2) and the pile foundation (1).

2. The distributed moment-resistance monopile foundation according to claim 1, characterized in that: The torque compensator (2) comprises a fixing ring (10), a torque transmission rod (20) and an airbag plate (21); the fixing ring (10) is fixed on the pile foundation (1); two ends of the torque transmission rod (20) are respectively connected to the fixing ring (10) and the airbag plate (21); and the airbag (22) is fixed on the airbag plate (21).

3. The distributed moment-resistance monopile foundation according to claim 2, characterized in that: A plurality of air bags (22) are fixed side by side below the air bag plate (21), and each air bag (22) is connected to a corresponding inflation valve on the top of the pile foundation (1) through an inflation pipe.

4. The distributed moment-resistance monopile foundation according to claim 2, characterized in that: The air bag (22) is locked on the air bag plate (21).

5. The distributed moment-resistance monopile foundation according to claim 2, characterized in that: The reverse torque M1 generated by a single torque compensator (2) is determined by the following expression: M1=F1×(B / 2+L1) Wherein, F1 represents the total buoyancy generated by all airbags (22) of the moment compensator (2), B represents the length of the airbag plate (21), and L1 represents the length of the moment transmission rod (20).

6. The distributed moment-resisting monopile foundation according to claim 5, characterized in that: F1=ρ×V×g, wherein ρ represents the density of seawater, V represents the total displacement volume of all air bags (22) of the torque compensator (2), and g represents the acceleration of gravity.

7. The distributed moment-resistance monopile foundation according to claim 2, characterized in that: The two ends of the torque transmission rod (20) are respectively connected to the fixing ring (10) and the airbag plate (21) by welding.

8. The distributed moment-resistance monopile foundation according to claim 2, characterized in that: The inner diameter of the fixing ring (10) is the same as the outer diameter of the pile foundation (1).

9. A method for implementing a distributed moment-resistant single pile foundation according to any one of claims 2 to 8, characterized in that: The fixing ring (10) is in a closed form and is pre-fixed on the pile foundation (1); before the pile foundation (1) is sunk through, all the air bags (22) on each moment compensator (2) are connected to the corresponding inflation valves on the top of the pile foundation (1) through the inflation pipe; after the pile foundation (1) is sunk through into place, each moment compensator (2) is installed in place; the inflation valve is opened and the air bags (22) are inflated through the inflation pipe, and after each air bag (22) is filled with a set amount of air, the installation is completed; the amount of air is monitored by a flow meter on each inflation pipe.

10. A method for implementing a distributed moment-resistant single pile foundation according to any one of claims 2 to 8, characterized in that: The fixing ring (10) is in a split form, and an inflation valve is provided on the top of the active pile foundation (1); first, all the air bags (22) on each moment compensator (2) are connected to the corresponding inflation valves on the top of the active pile foundation (1) through an inflation pipe; then, each moment compensator (2) is lowered to a designed depth, and the fixing ring (10) of each moment compensator (2) is fixed to the pile foundation (1) through a bolt, thereby completing the installation of the moment compensator (2); finally, the inflation valve is opened and the air bags (22) are inflated through the inflation pipe, and after each air bag (22) is filled with a set amount of air, the installation is completed; the amount of air is monitored by a flow meter on each inflation pipe.

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