A pile driving device for a wind power installation platform

Abstract

A pile driving device for a wind power installation platform, comprising a pile frame and a wind power installation platform; the pile frame includes a high-pile outer shell, and a high-pile valve is provided on the side wall of the high-pile outer shell to open and close the opening on the side wall of the high-pile outer shell; at least one intermediate pipe is connected below the high-pile outer shell, the intermediate pipe is connected to a low-pile outer shell, and a low-pile valve is provided in the low-pile outer shell to disconnect or connect the upper and lower sections of the low-pile outer shell; an elastic member is provided at the bottom end of the low-pile outer shell to pre-clamp the pile foundation; the wind power installation platform includes a main hull of the wind power installation platform, and a wind power installation platform hanger is installed on the main hull of the wind power installation platform. The lifting appliance of the wind power installation platform hanger is connected to or released from a piston, and the piston is located in the high-pile outer shell above the high-pile valve. The piston lifts or presses the seawater in the high-pile outer shell. The pile driving device for a wind power installation platform provided by the present invention can complete the pile driving operation at one time and improve the efficiency.

Description

Technical Field

[0001] The present invention relates to offshore piling equipment, in particular to a piling device for a wind power installation platform. Background Art

[0002] The piling hammers used in existing wind power installation platforms adopt the common hammer form. Such piling hammers have a simple structure and general effects. When the seabed conditions are relatively ideal, the effects of the piling hammers are better. However, when the seabed conditions are relatively complex, such as when the soft soil layer and the hard soil layer are chaotically stratified, it is difficult to achieve the expected pile leg fixing effect by using the form of the piling hammer. In addition, multiple ineffective hammer strikes are more likely to cause soil passivation, resulting in the need to start the piling operation from the beginning, greatly affecting the working efficiency of the wind power installation platform. However, there are not many windows of opportunity for offshore wind power installation platform operations. Once the efficiency of wind power installation cannot be improved, it will directly lead to the inability of the wind power installation platform to operate, causing certain economic losses. The problem that the piling hammers used in existing wind power installation platforms cannot adapt to the complex seabed soil distribution and thus greatly affect the operation.

[0003] The patent "A Flexible Sealed Water Hammer for Piling in Water" with the application number "201310578274.4" uses a hydraulic hammer for pounding. This patent does not directly use the effect generated by the change in water flow velocity to act on the pile foundation. Instead, it is completed by the gravity of water. In fact, it is still a piling hammer and not a water hammer effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a piling device for a wind power installation platform, which has high piling efficiency, good effects and a simpler structure.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A piling device for a wind power installation platform, comprising a pile frame and a wind power installation platform;

[0007] The pile frame includes a high-pile outer shell, a high-pile valve is provided on the side wall of the high-pile outer shell, and the high-pile valve opens and closes the opening on the side wall of the high-pile outer shell; at least one intermediate pipe is connected below the high-pile outer shell, the intermediate pipe is connected to a low-pile outer shell, a low-pile valve is provided in the low-pile outer shell, and the low-pile valve disconnects or connects the upper and lower sections of the low-pile outer shell; an elastic member is provided at the bottom end of the low-pile outer shell, and the elastic member pre-clamps the pile foundation.

[0008] The wind power installation platform includes a main hull of the wind power installation platform, a wind power installation platform hanger is installed on the main hull of the wind power installation platform, the lifting tool of the wind power installation platform hanger is connected or released from a piston, the piston is located in the high-pile outer shell above the high-pile valve, and the piston lifts or presses the seawater in the high-pile outer shell.

[0009] The middle pipeline and the low-pile housing are correspondingly two groups or more than two groups.

[0010] The upper end of the high-pile valve is hinged to the side wall of the high-pile housing.

[0011] A pile driving device for a wind power installation platform according to the present invention has the following technical effects:

[0012] 1). High pile driving efficiency and good effect. The pile driving operation can be completed at one time, avoiding repetition.

[0013] 2). Compared with the traditional pile hammer, the positioning is more accurate during the pile driving process, avoiding the skew of the pile foundation caused by the non-vertical loading direction of the pile hammer.

[0014] 3). Integrate the function of the pile hammer onto the pile frame. Compared with the traditional pile hammer, the structure is simpler, eliminating the pile hammer equipment, which not only improves the efficiency but also reduces the marine equipment, thus reserving more deck space.

[0015] 4). The pile driving operation of several pile foundations can be completed at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings and embodiments:

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the state when the high-pile valve of the present invention is open.

[0019] Figure 3 It is a schematic diagram of the state when the high-pile valve of the present invention is closed.

[0020] Figure 4 It is a schematic diagram of the state when the low-pile valve of the present invention is open.

[0021] Figure 5 It is a schematic diagram of the state when the low-pile valve of the present invention is closed.

[0022] Figure 6 It is a schematic diagram of the first working state of the present invention.

[0023] Figure 7 It is a schematic diagram of the second working state of the present invention.

[0024] Figure 8 It is a schematic diagram of the third working state of the present invention.

[0025] Figure 9 It is a schematic diagram of the fourth working state of the present invention.

[0026] In the figure: high-pile outer shell 11, high-pile valve 12, intermediate pipe 13, seawater 14, low-pile outer shell 15, low-pile valve 16, elastic member 17, pile foundation 18, wind power installation platform hanger 21, main hull of wind power installation platform 22, piston 23. Detailed implementation mode

[0027] As Figure 1 shown, a pile driving device for a wind power installation platform includes a pile frame and a wind power installation platform;

[0028] The pile frame includes a high-pile outer shell 11. The high-pile outer shell 11 is tubular and open at both the top and bottom. A high-pile valve 12 is provided on the side wall of the high-pile outer shell 11, and the high-pile valve 12 is located below the sea level. As Figure 2-3 shown, when the piston 23 moves upward, the opening at the high-pile valve 12 opens, and seawater enters the high-pile outer shell 11 from the outside to the inside. When the piston 23 moves downward, the opening at the high-pile valve 12 closes, and the seawater remains in the high-pile outer shell 11. Two intermediate pipes 13 are connected to the lower part of the high-pile outer shell 11. The number of intermediate pipes 13 can also be three, four... One low-pile outer shell 15 is correspondingly connected and communicated on one side of each intermediate pipe 13. The low-pile outer shell 15 is also a circular pipe structure and is open at both the top and bottom. A low-pile valve 16 is provided in the low-pile outer shell 15. The low-pile valve 16 is set at a position higher than the intermediate pipe 13 and lower than the high-pile valve 12. The low-pile valve 16 is mainly used to disconnect or connect the upper and lower sections of the low-pile outer shell 15. As Figure 4-5 shown, in the normal state, the opening on the intermediate partition of the low-pile valve 16 is open, and the upper and lower sections of the low-pile outer shell 15 remain connected, allowing seawater to enter and exit; when seawater acts on the lower part of the low-pile valve 16, the low-pile valve 16 can be pushed against the opening on the intermediate partition, and the upper and lower sections of the low-pile outer shell 15 are disconnected.

[0029] As Figure 1 shown, an elastic member 17 is provided at the bottom end of the low-pile outer shell 15. The elastic member 17 is rubber with a certain pre-pressure. The elastic member 17 pre-clamps the pile foundation 18 to prevent it from falling off the low-pile outer shell 15.

[0030] As Figure 1 shown, the wind power installation platform includes the main hull 22 of the wind power installation platform. A wind power installation platform hanger 21 is installed on the main hull 22 of the wind power installation platform. The lifting appliance of the wind power installation platform hanger 21 is connected to or released from the piston 23, and can apply an upward force to the piston 23 or release the piston 23 to allow the piston 23 to fall freely. The piston 23 is located in the high-pile outer shell 11 above the high-pile valve 12, and the piston 23 lifts the seawater in the high-pile outer shell 11.

[0031] Working principle and process:

[0032] 1), the piston 23 is driven to move upward by the hanger 21 of the wind power installation platform; at this time, both the high-pile valve 12 and the low-pile valve 16 are in the open state, and seawater 14 is injected into the pile frame and moves upward partially with the piston 23, and the depth of the seawater in the high-pile outer shell 11 is higher than the sea level.

[0033] 2), the hook of the hanger 21 of the wind power installation platform releases the piston 23, and the piston 23 and the seawater move downward rapidly under the action of gravity. At this time, the high-pile valve 12 is closed; after the water flow reaches a certain flow rate, the low-pile valve 16 will suddenly close under the action of the water hammer effect; at this time, the pile foundation 18 is driven downward into the seabed under the action of the uniform water hammer load, thus realizing pile driving.

[0034] 3), after pile driving is completed, the pile frame is lifted.

[0035] Since there is abundant water resources at sea, and the water hammer effect has an obvious pressure amplification effect. The increase in the pressure head of the water hammer effect is related to the water hammer wave propagation speed, gravitational acceleration, and the change value of the flow velocity. If the water hammer effect can be reasonably utilized during the installation of the pile foundation, it will have a very obvious optimization effect on the installation of the pile foundation. According to the calculation formula of the water hammer pressure in the pipeline (taking PVC pipeline as an example, this application uses stainless steel material, and the water hammer effect is more obvious):

[0036]

[0037]

[0038] In the formula:

[0039] ΔH - the increase in the pressure head of the direct water hammer, m

[0040] C - the water hammer wave propagation speed

[0041] Δv - the change value of the flow velocity in the pipe, m / s 2

[0042] e - the wall thickness of the pipe, mm

[0043] g - the gravitational acceleration, m / s 2

[0044] E s - the elastic modulus of the pipe material

[0045] Assume C = 1435, C represents the water hammer wave propagation speed. When the flow velocity change ΔV is 1 m / s, the increase in the water hammer head is 143.5 m, and the corresponding pile driving load reaches 143.5 t / m 2 , the load of the pile hammer generally used in existing general projects is 70 t / m 2, by using the water hammer effect, far exceeding the performance of existing pile hammers. Piling to the designed depth requires seabed soil data, which depends on actual data. According to the orifice outflow equation in fluid mechanics, it can be known that in an ideal state, the piston driving seawater to rise by 5m can achieve a velocity change of 1m / s, and a load of 143.5t / m 2 can achieve piling under almost all seabed conditions. Therefore, in practice, the piston lifting seawater by 2 - 5 meters can meet all existing piling requirements. Compared with existing pile hammers, the equipment is much simplified.

Claims

1. A pile driving device for a wind power installation platform, characterized in that: It includes a pile frame and a wind power installation platform; The pile frame includes a high-pile outer shell (11). A high-pile valve (12) is provided on the side wall of the high-pile outer shell (11), and the high-pile valve (12) opens and closes the opening on the side wall of the high-pile outer shell (11). At least one intermediate pipe (13) is connected below the high-pile outer shell (11), and the intermediate pipe (13) is connected to a low-pile outer shell (15). A low-pile valve (16) is provided in the low-pile outer shell (15), and the low-pile valve (16) disconnects or connects the upper and lower sections of the low-pile outer shell (15). An elastic member (17) is provided at the bottom end of the low-pile outer shell (15), and the elastic member (17) pre-clamps the pile foundation (18); The wind power installation platform includes a main hull (22) of the wind power installation platform. A wind power installation platform hanger (21) is installed on the main hull (22) of the wind power installation platform. The lifting appliance of the wind power installation platform hanger (21) is connected to or released from a piston (23). The piston (23) is located in the high-pile outer shell (11) above the high-pile valve (12), and the piston (23) lifts or presses down the seawater in the high-pile outer shell (11).

2. The pile driving device for a wind power installation platform according to claim 1, characterized in that: The intermediate pipes (13) and the low-pile outer shells (15) are correspondingly two groups or more than two groups.

3. A pile driving device for a wind power installation platform according to claim 1, characterized in that: The upper end of the high-pile valve (12) is hinged to the side wall of the high-pile outer shell (11).

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