Tool for offshore wind power foundation pile and method for using same

A tool for an offshore wind power foundation pile includes a steel pipe pile, a pile core, a pile cap, and a pile shoe. A cutting shoe portion is arranged at a bottom of the steel pipe pile, and an outer diameter of the pile shoe is larger than an outer diameter of the cutting shoe portion; the pile cap is detachably connected to the top of the steel pipe pile; the pile core is located in the steel pipe pile, the pile core is detachably connected to the pile shoe, and a length of the pile core is larger than or equal to a length of the steel pipe pile; the pile cap is further provided with a pile core accommodating groove and a pile core limiting portion; the pile core limiting portion includes a pile core limiting block and a limiting hole.

TECHNICAL FIELD

The present disclosure relates to the field of offshore wind power, in particular, to a tool for an offshore wind power foundation pile and a method for using the same.

BACKGROUND OF THE INVENTION

The offshore wind power multi-pile foundation (such as a high-rise pile cap and a jacket foundation) is a foundation type that obtains the bearing capacity by inserting multiple foundation piles into the soil. The multi-pile foundation has the advantages of high overall structural stiffness, wide application range of the water depth, and low requirements on seabed geological conditions, and is widely used in offshore wind power plants in China.

As control conditions, the uplift and compression stability of the foundation piles of the multi-pile foundation generally determines the number, diameter and length of the foundation piles, which directly affects the engineering quantity and cost of the multi-pile foundation. Engineering practice shows that when the diameter of the ordinary steel pipe piles is greater than 1.5 m, the bearing capacity of the end of the pile foundation cannot play a role. In addition, the soil in the foundation piles will be disturbed greatly in the pile sinking process of the pile foundation, and the friction force between the soil in the steel pipe piles and the foundation piles cannot play a role. Therefore, the uplift and compression stability of the steel pipe piles is achieved only by means of the friction force between the outer walls of the foundation piles and the soil around the piles. The compression and uplift stability of the pile foundation is improved only by increasing the diameter and length of the piles in the prior art.

SUMMARY OF THE INVENTION

The present disclosure provides a tool for an offshore wind power foundation pile and a method for using the same.

The tool for the offshore wind power foundation pile includes a foundation module and a pile sinking module, wherein the foundation module includes a steel pipe pile and a pile shoe, the pile sinking module includes a pile core and a pile cap, a cutting shoe portion is arranged at a bottom of the steel pipe pile, and an outer diameter of the pile shoe is larger than an outer diameter of the cutting shoe portion; the pile cap is detachably connected to a top of the steel pipe pile; the pile core is located in the steel pipe pile, the pile core is detachably connected to the pile shoe, and a length of the pile core is larger than or equal to a length of the steel pipe pile; the pile cap is further provided with a pile core accommodating groove and a pile core limiting portion; the pile core accommodating groove communicates with an inner cavity of the steel pipe pile and is configured to accommodate part of the pile core; the pile core limiting portion includes a pile core limiting block and a limiting hole and is configured to adjust a state of the pile core in the pile core accommodating groove and the inner cavity of the steel pipe pile; upon the pile core limiting block being located in a first position, the pile core may freely pass through the pile core accommodating groove and the inner cavity of the steel pipe pile; upon the pile core limiting block being located in a second position, the pile core is fixed to the pile cap, and part of the pile core is located in the pile core accommodating groove; and upon the pile core limiting block being located in a third position, the pile core is located below the pile core limiting block.

Preferably, the pile shoe includes a truncated cone section, and a diameter of the truncated cone section is gradually increased from top to bottom.

Preferably, the pile shoe further includes a connecting section connected to the pile core, and the connecting section is located on the truncated cone section; and the pile core is provided with a claw portion configured to grasp or loosen the connecting section.

Preferably, the pile shoe includes a pile tip section located at a bottom end of the truncated cone section.

Preferably, the pile cap further includes a driving portion located at a top end and a lining portion located at a bottom end and configured to be sleeved in the steel pipe pile, the driving portion is coaxial with the lining portion, and an outer diameter of the lining portion is equal to an inner diameter of the steel pipe pile.

Preferably, the cutting shoe portion includes a plurality of cutting shoes, and the cutting shoes are circumferentially arranged at intervals.

Preferably, the tool includes a first servo linear motion control portion and a second servo linear motion control portion, the first servo linear motion control portion is configured to control a positional change of the pile core limiting block, and the second servo linear motion control portion is configured to control a disconnection or connection between the pile core and the pile shoe.

Preferably, the pile core includes a first pile core section and a second pile core section which are connected to each other, and an end of the second pile core section away from the first pile core section is provided with the claw portion.

A method for using the above tool for the offshore wind power foundation pile includes: S1) connecting the pile core to the pile shoe, and arranging the pile core limiting block in the first position, so that part of the pile core is located in the pile core accommodating groove; then arranging the pile core limiting block in the second position, so that the pile core is fixed to the pile cap; S2) hoisting the tool to a position of the pile shoe making contact with a top surface of a seabed; arranging the pile core limiting block in the first position, lifting the pile cap till the top of the pile core moves to a position below the pile core limiting block, and arranging the pile core limiting block in the third position; S3) hammering the top of the pile cap, so that the tool sinks to the preset position; S4) arranging the pile core limiting block in the first position, disconnecting the pile core from the pile shoe, and hammering the top of the pile cap, so that the steel pipe pile sinks, and the cutting shoes of the bottom cutting shoe portion are expanded outwards in a radial direction of the pile shoe; and S5) uplifting the pile cap and the pile core, and pouring concrete into the steel pipe pile, so that a gap between the steel pipe pile and the pile shoe is closed.

As described above, according to the tool for the offshore wind power foundation pile of the present disclosure, the pile core limiting portion and the pile core are detachably connected to the pile shoe, so that the change of the position of the pile core relative to the pile shoe and the pile cap in the piling process is achieved, thus the stress change of the steel pipe pile in different piling stages is achieved, so that the cutting shoes of the cutting shoe portion of the steel pipe pile are radially expanded outwards when the tool for the foundation pile is located in the preset position, the bottom of the foundation pile is expanded, the foundation area of the soil at the bottom end of the foundation pile is increased, the uplift bearing capacity of the foundation pile is improved, the anchoring effect of the foundation pile in a foundation is enhanced, the size and consumption of the steel pipe pile are reduced, the cost is reduced, and the whole mounting process of the foundation pile is facilitated.

DESCRIPTION OF REFERENCE NUMERALS

DETAILED DESCRIPTION

The implementations of the present disclosure are described below in specific embodiments, and a person skilled in the art can easily understand other advantages and functions of the present disclosure from the contents disclosed in this specification.

It should be noted that the structure, proportion and size of drawings in this specification are only used for cooperating with the contents disclosed in this specification so as to be understood and read by a person skilled in the art and are not construed as a limitation on the implementations of the present disclosure and thus have no technical significance. Any modification of the structure or change of the proportion relationship or adjustment of the size without affecting the functions and purposes of the present disclosure shall fall within the scope of the technical contents disclosed by the present disclosure. Meanwhile, terms such as “upper,” “lower,” “left,” “right,” and “middle” used in this specification are only used for descriptive purposes and are not intended to limit the scope of the implementations of the present disclosure. The change or adjustment of the relative relation without substantially changing the technical contents shall fall within the scope of the implementations of the present disclosure.

As shown inFIGS.1to6, a tool for an offshore wind power foundation pile according to an embodiment includes a foundation module100and a pile sinking module200. The foundation module100includes a steel pipe pile110and a pile shoe130. The pile sinking module200includes a pile core220and a pile cap210. In the pile sinking process, the foundation module100is ultimately fixed to a seabed, and the bottoms of the pile shoe130and the steel pipe pile110go deep into the seabed.

A cutting shoe portion120is arranged at the bottom of the steel pipe pile110. An outer diameter of the pile shoe130is larger than an outer diameter of the cutting shoe portion120. The pile cap210is detachably connected to a top of the steel pipe pile110. The pile core220is located in the steel pipe pile110. The pile core220is detachably connected to the pile shoe130. A length of the pile core220is larger than or equal to a length of the steel pipe pile110. Therefore, the pile shoe130is located below the cutting shoe portion120.

The pile cap210is further provided with a pile core accommodating groove213and a pile core limiting portion214. The pile core accommodating groove213communicates with an inner cavity of the steel pipe pile110and is configured to accommodate part of the pile core220. The pile core limiting portion214includes a pile core limiting block2141and a limiting hole2142. The limiting hole2142communicates with the pile core accommodating groove213and the inner cavity of the steel pipe pile110. The pile core limiting block2141is configured to open and close the limiting hole2142. The pile core limiting block2141is arranged in three positions. As shown inFIG.1andFIG.3, when the pile core limiting block2141is located in a first position, the limiting hole2142is fully opened, and the pile core220may freely pass through the pile core accommodating groove213and the inner cavity of the steel pipe pile110. As shown inFIG.1andFIG.4, when the pile core limiting block2141is located in a second position, the limiting hole2142is semi-closed, the pile core220is clamped in the limiting hole2142, and part of the pile core220is located in the pile core accommodating groove213. That is, the pile core220located at the limiting hole2142is clamped between the pile core limiting block2141and a wall of the limiting hole2142, so that the pile core220is fixed to the pile cap210. As shown inFIG.1andFIG.5, when the pile core limiting block2141is located in a third position, the limiting hole2142is fully closed, and the pile core220is located below the pile core limiting block2141. In this embodiment, the pile core limiting portion214is provided with a sliding groove formed in a radial direction of the pile cap210and configured to limit and guide the movement of the pile core limiting block2141.

According to the present disclosure, the pile core limiting portion214and the pile core220are detachably connected to the pile shoe130, so that the change of the position of the pile core220relative to the pile shoe130and the pile cap210in the piling process of the pile core220is achieved, thus the stress change of the steel pipe pile110in different piling stages is achieved, so that the cutting shoes121of the cutting shoe portion120of the steel pipe pile110are radially expanded outwards when the tool for the foundation pile is located in the preset position, the bottom of the foundation pile is expanded, the anchoring effect of the foundation pile in a foundation is enhanced, the uplift bearing capacity of the foundation pile is improved, and the whole mounting process of the foundation pile is facilitated.

As shown inFIG.1andFIG.6, specifically, a method for using a tool for an offshore wind power foundation pile is provided according to an embodiment of the present disclosure. The method uses the described tool for the offshore wind power foundation pile, and specifically includes the following steps:S1) It is confirmed that the pile core220is connected to the pile shoe130, and the pile core limiting block2141is arranged in the first position, so that part of the pile core220is located in the pile core accommodating groove213. Then the pile core limiting block2141is arranged in the second position, so that the pile core220is fixed to the pile cap210.S2) The tool is hoisted to a position of the pile shoe130making contact with a top surface of a seabed. The pile core limiting block2141is arranged in the first position, the pile cap210is lifted till the top of the pile core220moves to a position below the pile core limiting block2141, and the pile core limiting block2141is arranged in the third position.S3) The top of the pile core220is hammered, so that the tool sinks to a preset position. At this moment, the pile core limiting block2141is located in the third position. In the process of hammering the top of the pile cap210, an upper end of the pile core220abuts against a lower end surface of the pile core limiting block2141. The length of the pile core220is greater than or equal to that of the steel pipe pile110. Therefore, the pile core220pushes the pile shoe130to continuously drill into the seabed, and the steel pipe pile110also continuously goes deep till the pile shoe130sinks to the preset position. At this moment, the foundation module100is fixed to the seabed.S4) The pile core limiting block2141is arranged in the first position. The pile core220is disconnected from the pile shoe130. The top of the pile cap210is hammered. Thus the steel pipe pile110sinks, and the cutting shoes121of the bottom cutting shoe portion120are expanded outwards in a radial direction of the pile shoe130. When the pile core limiting block2141is located in the first position, the top of the pile cap210is hammered. The top of the pile core220goes deep into the pile core accommodating groove213. The steel pipe pile110continuously goes deep. The position of the pile shoe130is relatively fixed, and the pile shoe is located below the steel pipe pile110. Therefore, the circumferentially distributed cutting shoes121of the cutting shoe portion120radially extend to form a bottom expansion structure of the foundation pile.S5) The pile cap210and the pile core220are uplifted. The pile sinking module200is uplifted away from the seabed. Concrete300is poured into the steel pipe pile110, so that a gap between the steel pipe pile110and the pile shoe130is closed, and pile sinking is achieved. In this step, the pile core limiting block2141may be arranged in the first position firstly, so that part of the pile core220is located in the pile core accommodating groove213. Then the pile core limiting block2141is arranged in the second position, so that the pile core220is fixed to the pile cap210. Then the whole pile sinking module200is uplifted.

The method for using the tool for the offshore wind power foundation pile has the advantages of convenience and simplicity in use. After the tool enters a sea, only the position of the pile core limiting block2141and the connecting state of the pile core220and the pile shoe130need to be adjusted, so that the foundation pile is mounted to the preset position, and the cutting shoe portion120is expanded to form the bottom expansion structure of the foundation pile.

As shown inFIG.2, according to an embodiment of the tool for the offshore wind power foundation pile, the pile shoe130includes a truncated cone section132. The diameter of the truncated cone section132is gradually increased from top to bottom. The cutting shoe portion120includes a plurality of cutting shoes121. The cutting shoes121are circumferentially arranged at intervals. In the expanding process of the cutting shoe portion120, the diameter of the truncated cone section132is gradually increased from top to bottom so as to guide the cutting shoes121to radially expand outwards. Preferably, the cutting shoe portion120may be formed by a plurality of elongated grooves which are formed in a circumferential direction of the steel pipe pile110and extend in an axial direction of the steel pipe pile110. These elongated grooves all penetrate through the steel pipe pile110in the axial direction.

Preferably, as shown inFIG.2, the pile shoe130further includes a connecting section131connected to the pile core220. The connecting section131is located on the truncated cone section132. The pile core220is provided with a claw portion223configured to grasp or loosen the connecting section131. The claw portion223is circumferentially and uniformly provided with a plurality of claws which are rotatably connected to the bottom of the pile core220. The connecting section131is provided with a circular cylinder portion. When the pile core220is connected to the pile shoe130, all the claws grasp the circular cylinder portion in an axial direction of the circular cylinder portion. When the pile core220needs to be disconnected from the pile shoe130, free ends of all the claws expand from inside to outside, so that all the claws are disengaged from the circular cylinder portion, and thus the pile core220is disconnected from the pile shoe130. The pile core220includes a first pile core section221and a second pile core section222which are connected to each other. An end of the second pile core section222away from the first pile core section221is provided with the claw portion223. Since the geological conditions of different offshore wind turbine positions are different, the depth of a pile foundation in soil is different. Therefore, the pile core220is segmented, and only a part of the pile core220needs to be replaced for different positions. The second pile core section222provided with the claw portion223has a relatively complex structure and can be reused.

As shown inFIG.2, the pile shoe130includes a pile tip section133located at a bottom end of the truncated cone section132. In this embodiment, the pile tip section133is a closed entity, and enhances the drilling capacity of the pile shoe130in the hammering process.

As shown inFIG.1, the pile cap210further includes a driving portion211located at a top end and a lining portion212located at a bottom end and configured to be sleeved in the steel pipe pile110. The driving portion211is coaxial with the lining portion212. The outer diameter of the lining portion212is equal to the inner diameter of the steel pipe pile110. During operation, the lining portion212is sleeved in the steel pipe pile110, so that the driving portion211is coaxial with the steel pipe pile110. In the sinking process of the foundation module100, the steel pipe pile110is sleeved over the lining portion212so as to be guided. In practical engineering, the pile cap210is welded or is in bolted connection to a position below the driving portion211.

The embodiment of the tool for the offshore wind power foundation pile further includes a first servo linear motion control portion2144and a second servo linear motion control portion2231. The first servo linear motion control portion2144is configured to control a positional change of the pile core limiting block2141. The second servo linear motion control portion2231is configured to control a disconnecting or connecting state between the pile core220and the pile shoe130. In specific applications, the pile core limiting block2141may be controlled to be located in the first position, the second position and the third position by controlling the first servo linear motion control portion2144. The claw portion223of the pile core220is controlled by controlling the second servo linear motion control portion2231, so that the pile core220is controlled to be connected to or disconnected from the pile shoe130.

The described embodiments are only used for exemplary description of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Modifications or changes may be made to the described embodiments by any person skilled in the prior art without departing from the spirit and scope of the present disclosure. Therefore, any equivalent modification or change made by a person of ordinary skill in the art without departing from the spirit and technical thought disclosed by the present disclosure shall still fall within the scope of claims of the present disclosure.