Single pile auxiliary piling device and method for offshore wind power platform

Abstract

The invention belongs to the technical field of offshore wind power construction, and discloses an offshore wind power platform single pile auxiliary piling device and method.The device comprises a plurality of rock breaking units distributed at the lower end of a single pile at intervals in the circumferential direction, and each rock breaking unit comprises a connecting piece, a power unit and a drill rod; the upper end of the connecting piece is fixed to the lower end of the single pile, and a power mounting cavity is formed in the connecting piece; the power unit is arranged in the power mounting cavity; the upper end of the drill rod is connected with the power unit, and the lower end of the drill rod penetrates out of the lower end of the connecting piece and is provided with a drill bit. The method solves the problems that according to a traditional method that a hydraulic impact hammer is directly used for pile sinking, bearing force eccentricity is likely to happen at the critical point of the hammer encountering a hard stratum, the puncture slippage phenomenon is generated, and certain potential safety hazards are caused to installation of equipment such as a generator set in the later period.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power construction, and in particular to a single-pile auxiliary piling device and method for an offshore wind power platform. Background Art

[0002] As an emerging clean energy, offshore wind power has significant social benefits and broad market prospects. As my country's offshore wind power technology enters a period of rapid development, offshore wind power technology is also facing new technical challenges, and single pile foundation hammering technology is one of them.

[0003] In existing offshore wind farms, commonly used foundations include single pile foundations, underwater three-pile foundations, jacket foundations, and high-pile cap foundations. Of these, single pile foundations are the most widely used, offering the following technical advantages: clear force calculations are relatively simple, construction is more convenient and faster, and they are highly adaptable to geological and other environmental conditions. Single pile foundations are typically made of steel, and piling is a critical step in construction. If the stratum being driven is harder on the upper side and softer on the lower side, the traditional method of directly driving piles with a hydraulic impact hammer is prone to load-bearing capacity eccentricity at the critical point where the hammer encounters the hard stratum, resulting in penetration and slippage, posing a safety hazard to the subsequent installation of generator sets and other equipment. Summary of the Invention

[0004] In response to the defects in the existing technology, the present invention provides a single pile auxiliary piling device and method for an offshore wind power platform to solve the problem that the traditional method of directly using a hydraulic impact hammer to sink piles is prone to bearing capacity eccentricity at the critical point where the hammer encounters hard formations, resulting in puncture and slippage, which poses certain safety hazards to the subsequent installation of equipment such as generator sets.

[0005] In one aspect, the present invention provides an auxiliary piling device for a single pile on an offshore wind power platform, comprising a plurality of rock breaking units spaced circumferentially at the lower end of the single pile, each of the rock breaking units comprising:

[0006] A connecting piece, the upper end of which is fixed to the lower end of the monopile, and a power installation cavity is provided inside the connecting piece;

[0007] A power unit, the power unit being arranged in the power installation cavity;

[0008] A drill rod, the upper end of which is connected to the power unit, and the lower end of which passes through the lower end of the connector and is provided with a drill bit.

[0009] Furthermore, a transverse partition is provided in the power installation cavity, which divides the power installation cavity into an upper chamber and a lower chamber;

[0010] The power unit is installed in the upper chamber, and the output shaft of the power unit passes downward through the transverse partition and is provided with a transmission shaft;

[0011] The upper end of the drill rod is provided with a transmission sleeve that is axially slidably sleeved with the transmission shaft and is transmission-connected. The outside of the drill rod is provided with a support ring adapted to the lower chamber. The outside of the drill rod is also provided with a compression spring supported between the top wall of the lower chamber and the support ring.

[0012] Furthermore, an outer convex ring is provided at the upper end of the transmission sleeve.

[0013] Furthermore, a bearing is fixed outside the drill rod, and the support ring is installed outside the bearing.

[0014] Furthermore, the connecting piece is cylindrical.

[0015] Furthermore, the single pile is a steel pipe pile, and the upper end of the connector is provided with a slot, and the upper end of the connector is connected to the pipe wall of the lower end of the steel pipe pile through the slot and welded to the pipe wall of the steel pipe pile.

[0016] Furthermore, a conical head is provided at the lower end of the connecting piece, and the drill rod passes through the center of the conical head.

[0017] Furthermore, the power unit is a motor.

[0018] Furthermore, the drill bit is a diamond drill bit.

[0019] In another aspect, the present invention provides a method for assisting single-pile driving on an offshore wind power platform, comprising the following steps:

[0020] Step S10, controlling the pile hammer to drive the single pile into the stratum;

[0021] Step S20: When encountering a hard formation, each rock breaking unit is activated. The rock breaking unit drives the drill rod to rotate through the power unit, and the drill bit at the lower end of the drill rod drills a hole in the hard formation. The drilling of the drill rod is driven by a compression spring.

[0022] Step S30, when the drill rod is advanced until the support ring moves to the bottom of the lower chamber, the pile driving hammer is controlled to drive the single pile downward to the depth of the drill hole;

[0023] Step S40, repeating steps S20 and S30 until the single pile passes through the entire hard ground formation.

[0024] The beneficial effects of the present invention are embodied in:

[0025] 1. The offshore wind power platform single pile auxiliary piling tool provided by the present invention is used to carry out piling operations in "hard upper and soft lower" strata. When encountering hard strata, multiple rock-breaking units distributed around the lower end of the single pile can be used to actively drill holes in the hard bottom layer to break the rock, so that the single pile of the wind power platform can smoothly pass through the hard stratum to reach the softer stratum below, avoiding accidental settlement of the single pile when the soil quality of the stratum changes suddenly, ensuring the stability of the offshore wind power platform, enabling relatively smooth piling operations, and effectively reducing damage to the platform structure and the occurrence of safety accidents.

[0026] 2. The present invention can make the single pile legs of the offshore wind power platform more smoothly lowered during the lowering process, reduce the eccentric bearing force during the lowering process, make the pile legs and the single pile structure more balanced in force, and reduce the degree of damage to the pile legs.

[0027] 3. The present invention installs multiple rock-breaking units on the original pile legs through connectors. This structure does not destroy the integrity of the pile legs and is safe and reliable.

[0028] 4. The entire device of the invention has a simple structure, is easy to install and replace, and is suitable for batch and serial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0030] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0031] Figure 2 This is an assembly diagram of a rock breaking unit according to an embodiment of the present invention;

[0032] Figure 3 This is an exploded view of a rock breaking unit according to an embodiment of the present invention;

[0033] Figure 4 This is a front view of a rock breaking unit according to an embodiment of the present invention;

[0034] Figure 5 for Figure 4 AA cross-sectional view.

[0035] In the accompanying drawings, 100 is a single pile; 200 is a rock-breaking unit; 210 is a connecting piece; 211 is a power installation chamber; 2111 is a cross partition; 2112 is an upper chamber; 2113 is a lower chamber; 212 is a slot; 213 is a conical head; 220 is a power unit; 221 is a transmission shaft; 230 is a drill rod; 231 is a drill bit; 232 is a transmission sleeve; 2321 is an outer convex ring; 233 is a support ring; 234 is a bearing; 240 is a compression spring. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0037] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0038] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a single pile auxiliary piling device for an offshore wind power platform, comprising a plurality of rock breaking units 200 circumferentially spaced and distributed at the lower end of a single pile 100 , where the single pile 100 is generally a steel pipe pile.

[0039] Each rock breaking unit 200 includes a connecting piece 210 , a power unit 220 and a drill rod 230 .

[0040] The upper end of the connecting member 210 is fixed to the lower end of the monopile 100 , and a power installation cavity 211 is provided inside the connecting member 210 .

[0041] Optionally, refer to Figure 1 and Figure 2 In order to facilitate the fixed connection between the connecting piece 210 and the pile leg of the single pile 100, a clamping groove 212 is provided at the upper end of the connecting piece 210. The upper end of the connecting piece 210 is clamped on the pipe wall of the lower end of the steel pipe pile through the clamping groove 212 and welded to the pipe wall of the steel pipe pile.

[0042] The power unit 220 is disposed in the power installation cavity 211. Optionally, the power unit 220 is a motor.

[0043] The upper end of the drill rod 230 is connected to the power unit 220, and the lower end of the drill rod 230 passes through the lower end of the connector 210 and is provided with a drill bit 231. Optionally, the drill bit 231 is a diamond drill bit.

[0044] In order to reduce the resistance of the lower end of the connector 210 to the pile driving, a conical head 213 is provided at the lower end of the connector 210 , and the drill rod 230 passes through the center of the conical head 213 .

[0045] In some embodiments, reference Figure 3 and Figure 5 A transverse partition 2111 is provided in the power installation chamber 211 , and the transverse partition 2111 divides the power installation chamber 211 into an upper chamber 2112 and a lower chamber 2113 .

[0046] The power unit 220 is installed in the upper chamber 2112 , and the output shaft of the power unit 220 passes downward through the transverse partition 2111 and is provided with a transmission shaft 221 .

[0047] The upper end of the drill rod 230 is provided with a transmission sleeve 232 which is axially slidably sleeved with the transmission shaft 221 and is transmission-connected. The outside of the drill rod 230 is provided with a support ring 233 which is adapted to the lower chamber 2113. The outside of the drill rod 230 is also provided with a compression spring 240 which is supported between the top wall of the lower chamber 2113 and the support ring 233.

[0048] When the single pile 100 passes through the soft formation, the single pile 100 can be driven into the formation by a pile hammer. During this process, the soft formation will generate an upward thrust on the drill bit 231 and the drill rod 230, causing the compression spring 240 to be compressed, and the transmission sleeve 232 at the upper end of the drill rod 230 to rest against the lower side of the support ring 233. In this way, the thrust of the formation on the drill bit 231 and the drill rod 230 will directly pass through the connecting piece 210 instead of being transmitted to the power unit 220, thereby avoiding damage to the power unit 220.

[0049] When encountering a hard formation, each rock breaking unit 200 is started. The rock breaking unit 200 drives the drill rod 230 to rotate through the power unit 220, and the drill bit 231 at the lower end of the drill rod 230 drills a hole in the hard formation. The drilling of the drill rod 230 is pushed by the compression spring 240. When the drill rod 230 is advanced to the bottom of the support ring 233 and moves to the bottom of the lower chamber 2113, the pile driving hammer is controlled to drive the single pile 100 downward to the depth of the drill hole. During this process, the compression spring 240 is compressed again, and then each rock breaking unit 200 is started again to drill a hole in the hard formation around the single pile 100. In this way, the rock breaking unit 200 and the pile driving hammer work alternately, so that the single pile 100 can easily pass through the hard formation.

[0050] Preferably, refer to Figure 3 and Figure 5 The upper end of the transmission sleeve 232 is provided with an outer convex ring 2321. When passing through the soft formation, the upper end of the transmission sleeve 232 abuts against the lower layer of the diaphragm 2111 through the outer convex ring 2321, which can increase the contact area between the upper end of the transmission sleeve 232 and the diaphragm 2111, thereby reducing the pressure.

[0051] Preferably, continue to refer to Figure 3 and Figure 5A bearing 234 is fixed to the outside of the drill rod 230, and a support ring 233 is mounted on the outside of the bearing 234. During the drilling process, the drill rod 230 is pushed by the compression spring 240. If the support ring 233 rotates with the drill rod 230, the friction resistance between the compression spring 240 and the support ring 233 is relatively large. However, the support ring 233 of the present application is mounted on the outside of the drill rod 230 via the bearing 234. As a result, during the rotation of the drill rod 230, the support ring 233 does not rotate with the drill rod 230, thereby reducing the rotation resistance.

[0052] An embodiment of the present invention further provides a single pile auxiliary piling method for an offshore wind power platform, comprising the following steps:

[0053] Step S10, controlling the pile hammer to drive the single pile 100 into the stratum;

[0054] Step S20: When encountering a hard formation, each rock breaking unit 200 is activated. The rock breaking unit 200 drives the drill rod 230 to rotate through the power unit 220. The drill bit 231 at the lower end of the drill rod 230 drills a hole in the hard formation. The drilling of the drill rod 230 is driven by the compression spring 240.

[0055] Step S30 , when the drill rod 230 is advanced until the support ring 233 moves to the bottom of the lower chamber 2113 , the pile hammer is controlled to drive the single pile 100 downward to the depth of the borehole;

[0056] Step S40 , repeating steps S20 and S30 until the monopile 100 passes through the entire hard ground formation.

[0057] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0058] 1. The offshore wind power platform single pile auxiliary piling tool provided by the present invention is used to perform piling operations on "hard upper and soft lower" strata. When encountering hard strata, multiple rock-breaking units 200 distributed around the lower end of the single pile 100 can be used to actively drill holes in the hard bottom layer to break the rock, so that the single pile 100 of the wind power platform can smoothly pass through the hard stratum to reach the softer stratum below, avoiding accidental settlement of the single pile 100 when the stratum soil property suddenly changes, ensuring the stability of the offshore wind power platform, enabling relatively smooth piling operations, and effectively reducing damage to the platform structure and the occurrence of safety accidents.

[0059] 2. The present invention can make the legs of the single pile 100 of the offshore wind power platform more smoothly lowered during the lowering process, reduce the eccentric bearing force during the lowering process, make the forces on the legs and the single pile 100 structure more balanced, and reduce the degree of damage to the legs.

[0060] 3. The present invention installs multiple rock breaking units 200 on the original pile legs through connectors 210. This structure does not destroy the integrity of the pile legs and is safe and reliable.

[0061] 4. The entire device of the invention has a simple structure, is easy to install and replace, and is suitable for batch and serial production.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An auxiliary piling device for a single pile on an offshore wind power platform, characterized by: It includes multiple rock-breaking units distributed at intervals along the circumference at the lower end of the single pile, each of the rock-breaking units includes: A connecting piece, the upper end of which is fixed to the lower end of the monopile, and a power installation cavity is provided inside the connecting piece; A power unit, the power unit being arranged in the power installation cavity; A drill rod, the upper end of which is connected to the power unit, and the lower end of which passes through the lower end of the connector and is provided with a drill bit.

2. The offshore wind power platform single pile auxiliary piling device according to claim 1, characterized in that: A transverse partition is provided in the power installation cavity, which divides the power installation cavity into an upper chamber and a lower chamber; The power unit is installed in the upper chamber, and the output shaft of the power unit passes downward through the transverse partition and is provided with a transmission shaft; The upper end of the drill rod is provided with a transmission sleeve that is axially slidably sleeved with the transmission shaft and is transmission-connected. A support ring adapted to the lower chamber is provided on the outside of the drill rod. A compression spring supported between the top wall of the lower chamber and the support ring is also provided on the outside of the drill rod.

3. The offshore wind power platform single pile auxiliary piling device according to claim 2, characterized in that: An outer convex ring is provided on the upper end of the transmission sleeve.

4. The offshore wind power platform single pile auxiliary piling device according to claim 2, characterized in that: A bearing is fixed outside the drill rod, and the support ring is installed outside the bearing.

5. The offshore wind power platform single pile auxiliary piling device according to claim 1, characterized in that: The connecting piece is cylindrical.

6. The offshore wind power platform single pile auxiliary piling device according to claim 5, characterized in that: The single pile is a steel pipe pile. The upper end of the connector is provided with a slot. The upper end of the connector is connected to the pipe wall of the lower end of the steel pipe pile through the slot and is welded to the pipe wall of the steel pipe pile.

7. The offshore wind power platform single pile auxiliary piling device according to claim 5, characterized in that: The lower end of the connecting piece is provided with a conical head, and the drill rod passes through the center of the conical head.

8. The offshore wind power platform single pile auxiliary piling device according to claim 1, characterized in that: The power unit is a motor.

9. The offshore wind power platform single pile auxiliary piling device according to claim 1, characterized in that: The drill bit is a diamond drill bit.

10. A single pile auxiliary piling method for an offshore wind power platform, characterized in that: The method uses the offshore wind power platform single pile auxiliary piling device as claimed in claim 2, comprising the following steps: Step S10, controlling the pile hammer to drive the single pile into the stratum; Step S20: When encountering a hard formation, each rock breaking unit is activated. The rock breaking unit drives the drill rod to rotate through the power unit, and the drill bit at the lower end of the drill rod drills a hole in the hard formation. The drilling of the drill rod is driven by a compression spring. Step S30, when the drill rod is advanced until the support ring moves to the bottom of the lower chamber, the pile driving hammer is controlled to drive the single pile downward to the depth of the drill hole; Step S40, repeating steps S20 and S30 until the single pile passes through the entire hard ground formation.

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