Pile shoe

Abstract

The invention relates to the technical field of engineering foundation structures, and discloses a pile shoe which comprises a base body and an anchor body. A plurality of seepage channels are formed in the base body in the axial direction; the anchor body is arranged at the lower end of the base body, the anchor body is arranged in a hollow and through mode, the anchor body is provided with a plurality of hollow pipe bodies in the axial direction, the length of the pipe bodies is larger than that of the anchor body, first overflow holes are formed in the pipe bodies in the radial direction, one part of the first overflow holes are communicated with the exterior of the anchor body, and the other part of the first overflow holes are communicated with the interior of the anchor body. A second overflow hole is formed in the lower end of the pipe body in the axial direction. When the pile shoe is installed, the anchor body is inserted into a soil body, negative pressure water pumping is conducted through the pipe body, drainage consolidation of the soil body around the anchor body is accelerated, the bearing capacity of the pile shoe is enhanced, and meanwhile cost is reduced. In addition, when the pile shoe is recycled, water is injected into the pipe body, the water flows out of the first overflow hole and the second overflow hole, the soil body is softened, the negative pressure suction force between the anchor body and the soil body is reduced, and the pile shoe is convenient to recycle.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering infrastructure, and particularly to a pile shoe. Background Art

[0002] In recent years, the offshore wind power has developed rapidly, and the demand for wind power installation vessels has been continuously increasing. At present, most of the offshore wind power installation vessels are self-elevating type, equipped with multiple pile legs, and each pile leg is provided with an independent pile shoe at the bottom. During operation, the pile leg-pile shoe structure is inserted into the seabed to resist the vertical load caused by its own weight and the horizontal load and bending moment caused by sea wind, waves, currents, etc. The installation of the pile shoe is usually carried out by a pile driver, which can effectively drive the pile shoe into the predetermined depth.

[0003] During the service period of the pile shoe, the soil at the bottom of the pile shoe will drain and consolidate under the action of the upper load, which increases the shear strength of the soil. However, due to the large size of the pile shoe, the drainage path is long and the consolidation time is long. Therefore, in the geotechnical design of the pile shoe, only the undrained bearing capacity of the pile shoe is generally considered, and the increase in bearing capacity brought by the consolidation and drainage of the soil is ignored. This will result in that when the pile shoe is used as a long-term service foundation, larger size and steel consumption are required to meet the bearing requirements, reducing the cost performance. At the same time, during the recovery stage of the pile shoe, due to the generation of negative pore pressure between the bottom of the pile shoe and the soil, the uplift bearing capacity is large and the recovery is difficult. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a pile shoe, including: a matrix and an anchor body; the matrix is axially provided with a plurality of seepage channels; the anchor body is arranged at the lower end of the matrix, the anchor body is provided in a hollow and through manner, the anchor body is axially provided with a plurality of hollow tubes, the length of the tube is greater than the length of the anchor body, the tube is radially provided with a first overflow hole, a part of the first overflow holes communicate with the outside of the anchor body, and another part of the first overflow holes communicate with the inside of the anchor body, and the lower end of the tube is axially provided with a second overflow hole.

[0005] In some embodiments of the invention, the anchor body includes a plurality of skirt plates, and the plurality of skirt plates enclose to form the anchor body, the tube is arranged between two adjacent skirt plates, and both sides of the tube are respectively connected to the skirt plates.

[0006] In some embodiments of the invention, permeable stones are arranged in the seepage channels.

[0007] In some embodiments of the invention, first filters are provided at both ends of the seepage channel. The first filter includes three layers of steel wire mesh and three layers of geotextile mesh. The three layers of steel wire mesh are stacked on the outer side of the end of the seepage channel, and the three layers of geotextile mesh are arranged inside the seepage channel. Along the axial direction of the seepage channel from outside to inside, the three layers of steel wire mesh, the three layers of geotextile mesh, and the permeable stone are arranged in sequence.

[0008] In some embodiments of the invention, second filters are provided at both the first overflow hole and the second overflow hole.

[0009] In some embodiments of the invention, the skirt plate is integrally arc-shaped.

[0010] In some embodiments of the invention, the upper end of the pipe body passes through the base body.

[0011] In some embodiments of the invention, inclined surfaces are provided on both the upper side and the lower side of the base body, and the seepage channel penetrates through the inclined surfaces on both the upper and lower sides.

[0012] Compared with the prior art, the pile shoe according to the embodiment of the present invention has the following beneficial effects: When installing the pile shoe, the anchor body is inserted into the soil mass, and negative pressure pumping is carried out through the pipe body, which accelerates the drainage consolidation of the soil mass around the anchor body, enhances the bearing capacity of the pile shoe, and reduces the cost at the same time; In addition, when recovering the pile shoe, by injecting water into the pipe body, the water flows out from the first overflow hole and the second overflow hole, softening the soil mass, reducing the negative pressure suction at the anchor body and the soil mass, and facilitating the recovery of the pile shoe. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the pile shoe according to the embodiment of the present invention;

[0014] Figure 2 is a schematic diagram of the use of the pile shoe according to the embodiment of the present invention;

[0015] Figure 3 is a schematic diagram of the seepage channel in the pile shoe according to the embodiment of the present invention;

[0016] Figure 4 is a schematic diagram of the anchor body in the pile shoe according to the embodiment of the present invention;

[0017] Figure 5 is a schematic diagram of the seepage channel and the pipe body in the pile shoe according to the embodiment of the present invention.

[0018] Description of the Reference Numerals:

[0019] Base body 100, first filter 111, second filter 112, inclined surface 120, permeable stone 130, seepage channel 140, anchor body 200, skirt plate 210, pipe body 220, first seepage hole 221. Detailed Embodiments

[0020] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0021] In recent years, the development of offshore wind power has been rapid, and the demand for wind power installation vessels has been continuously increasing. At present, most offshore wind power installation vessels are self-elevating, with multiple leg structures, and each leg is equipped with an independent pile shoe at the bottom. During operation, the leg-pile shoe structure is inserted into the seabed to resist the vertical load caused by its own weight and the horizontal load and bending moment caused by wind, waves, and currents at sea. The installation of pile shoes usually uses a pile driver, which can effectively drive the pile shoes into the predetermined depth. However, during the service life of the pile shoes, the soil at the bottom of the pile shoes will drain and consolidate under the action of the upper load, increasing the shear strength of the soil. However, due to the large size of the pile shoes and the long drainage path, the consolidation time is long. Therefore, in the geotechnical design of pile shoes, only the undrained bearing capacity of the pile shoes is generally considered, ignoring the increase in bearing capacity brought about by soil consolidation and drainage. This will result in the need for larger sizes and steel consumption to meet the bearing requirements when the pile shoes are used as long-term service foundations, reducing the cost performance. At the same time, during the recovery stage of the pile shoes, due to the generation of negative pore pressure between the bottom of the pile shoes and the soil, the uplift bearing capacity is large, making it difficult to recover.

[0022] Referring to Figure 1 and Figure 2 , a pile shoe according to a preferred embodiment of the present invention includes a matrix 100 and an anchor body 200; the matrix 100 is axially provided with a plurality of seepage channels 140. When the pile shoe is installed, the pile shoe is inserted into the soil; the anchor body 200 is arranged at the lower end of the matrix 100, and the anchor body 200 is provided with a hollow through structure. The anchor body 200 is axially provided with a plurality of hollow tubes 220. The length of the tubes 220 is greater than the length of the anchor body 200. The tubes 220 are radially provided with first overflow holes. A part of the first overflow holes communicates with the outside of the anchor body 200, and another part of the first overflow holes communicates with the inside of the anchor body 200. The lower end of the tubes 220 is axially provided with second overflow holes.

[0023] Referring to Figure 1 , the matrix 100 is provided with a plurality of seepage channels 140. When the pile shoe is in service, the anchor body 200 is inserted into the soil, and the lower side of the matrix 100 contacts the soil. The upper side of the pile shoe receives the pressure applied by the platform support, causing the lower side of the matrix 100 to press downward on the soil. The water in the soil will flow upward through the seepage channels 140, accelerating the drainage and consolidation process of the soil, thereby improving the bearing capacity of the pile shoe.

[0024] Referring to Figure 1 and Figure 4, the length of the pipe body 220 is much greater than the length of the anchor body 200, so that the first water seepage holes can completely cover the anchor body 200 along the length direction of the anchor body 200, facilitating the pipe body 220 to completely draw away the moisture of the soil mass around the anchor body 200 through the first water seepage holes and the second water seepage holes. The part of the pipe body 220 exceeding the anchor body 200, that is, the upper end of the pipe body 220 penetrates through the pile shoe, facilitating the docking of the upper end of the pipe body 220 with the pumping device and reducing the operation difficulty.

[0025] Refer to Figure 1 and Figure 2 , during installation, the anchor body 200 is inserted into the soil mass. The anchor body 200 is embedded in the soil mass and surrounded by the soil mass. The pipe body 220 is docked with the negative pressure pump for pumping water. The water in the soil mass on both the inner and outer sides of the anchor body 200 is drawn away through the first water seepage holes and the second water seepage holes, reducing the effective stress of the soil mass, thereby reducing the resistance when the anchor body 200 penetrates into the soil mass, facilitating the increase of the insertion depth of the anchor body 200, improving the stability, reducing the installation difficulty, and improving the installation efficiency.

[0026] During recovery, by injecting water into the pipe body 220, the water flows out from the first water seepage holes and the second water seepage holes again, infiltrating the soil mass consolidated under the lower side of the base body 100, reducing the negative pressure suction between the bottom of the base body 100 and the soil mass, reducing the resistance to pulling out the pile shoe, and improving the recovery convenience.

[0027] Refer to Figure 1 and Figure 4 , it can be understood that the anchor body 200 includes a plurality of skirt plates 210. In this embodiment, the plurality of skirt plates 210 enclose to form the anchor body 200. The pipe body 220 is arranged between two adjacent skirt plates 210. Both sides of the pipe body 220 are respectively connected to the skirt plates 210, making the pipe body 220 more stable in structure, thereby enhancing the overall bearing capacity and stability of the pile shoe and making the whole structure more stable. The pipe body 220 and the skirt plates 210 can be connected together by welding, thereby improving the bearing capacity and stability. The skirt plates 210 as a whole can adopt an arc design. After the skirt plates 210 enclose, a cylindrical anchor body 200 is formed, increasing the contact area between the anchor body 200 and the soil mass. Under the action of the load, more soil mass can be activated to improve the bearing performance. The design of the arc-shaped skirt plates 210 can effectively reduce the size and steel consumption of the pile shoe compared with the traditional straight skirt plate 210 design, improve the bearing capacity and stability of the pile shoe, and thus solve the problem that a larger size and more steel consumption are required during the use of the pile shoe.

[0028] Refer to Figure 3 and Figure 5, it can be understood that a permeable stone 130 is provided in the seepage channel 140 to enhance the water permeability of the seepage channel 140 of the pile shoe. As a material with good water permeability, the permeable stone 130 helps water to smoothly pass through the seepage channel 140 from bottom to top, thereby improving the drainage effect of the pile shoe and shortening the consolidation time.

[0029] Refer to Figure 3 , it can be understood that first filter meshes 111 are provided at both ends of the seepage channel 140. The first filter meshes 111 include three layers of wire meshes and three layers of geotextile meshes. The three layers of wire meshes are stacked outside the ends of the seepage channel, and the three layers of geotextile meshes are arranged inside the seepage channel 140. Along the axial direction of the seepage channel 140 from outside to inside, the three layers of wire meshes, the three layers of geotextile meshes and the permeable stone 130 are arranged in sequence. The mesh number of the wire mesh is 300 meshes, and the mesh number of the geotextile mesh is 1500 meshes. By the cooperation of the multi-layer wire meshes and the multi-layer geotextile meshes to filter clay, it can effectively filter the particulate matters entering the seepage channel 140, prevent the seepage channel 140 from being blocked, thereby improving the service life and reliability of the pile shoe. The wire mesh is made of stainless steel material and has good corrosion resistance. Through the cooperation of filter meshes with different mesh numbers, it can ensure effective filtration in soil environments with different particle sizes.

[0030] Refer to Figure 1 and Figure 5 , it can be understood that second filter meshes 112 are provided for both the first overflow hole and the second overflow hole to prevent soil from entering the pipe body 220 and causing blockage. The second filter meshes 112 can be made of corrosion-resistant materials, such as stainless steel meshes or polymer material meshes. The aperture size of the filter meshes can be selected according to actual needs to ensure that it can effectively filter impurities without affecting the drainage speed. In addition, the installation method of the filter meshes can be fixed or detachable, which is convenient for cleaning and replacement.

[0031] Refer to Figure 1 , it can be understood that inclined surfaces 120 are provided on both the upper side and the lower side of the base body 100, and the seepage channel 140 penetrates through the inclined surfaces 120 on both the upper and lower sides. By providing the inclined surfaces 120 on both the upper and lower sides of the pile shoe base body 100, the externally applied load can be effectively dispersed, reducing the structural damage or instability caused by stress concentration. At the same time, the design of the inclined surfaces 120 helps to enhance the stability of the pile shoe in the seabed, providing better resistance in the face of complex environments such as sea waves, and improving its long-term use safety and reliability.

[0032] In summary, the embodiment of the present invention provides a pile shoe. When installing the pile shoe, the anchor body 200 is inserted into the soil, and negative pressure pumping is carried out through the pipe body 220 to accelerate the drainage consolidation of the soil around the anchor body 200, enhance the bearing capacity of the pile shoe, and reduce the cost at the same time. In addition, when recovering the pile shoe, by injecting water into the pipe body 220, the water flows out from the first overflow hole and the second overflow hole, softens the soil, reduces the negative pressure suction between the anchor body 200 and the soil, and facilitates the recovery of the pile shoe.

[0033] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the counting principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A pile shoe, characterized in that: Included are: A base body is provided with a plurality of seepage channels along the axial direction; An anchor body is arranged at the lower end of the base body, the anchor body is hollow and through, and a plurality of hollow tubes are arranged axially on the anchor body, the length of the tubes is greater than the length of the anchor body, the tubes are radially provided with first overflow holes, a part of the first overflow holes is communicated with the outside of the anchor body, and another part of the first overflow holes is communicated with the inside of the anchor body, and a second overflow hole is axially provided on the lower end of the tube body.

2. The pile shoe according to claim 1, characterized in that: The anchor body includes a plurality of skirt plates, which are enclosed to form the anchor body. The tube body is arranged between two adjacent skirt plates, and two sides of the tube body are respectively connected to the skirt plates.

3. The pile shoe according to claim 1, characterized in that: Permeable stones are arranged in the seepage channel.

4. The pile shoe according to claim 3, characterized in that: A first filter screen is arranged at both ends of the seepage channel, and the first filter screen includes three layers of wire mesh and three layers of geonet. The three layers of wire mesh are stacked on the outside of the end of the seepage channel, and the three layers of geonet are arranged in the seepage channel. Along the axial direction of the seepage channel from outside to inside, the three layers of wire mesh, the three layers of geonet and the permeable stone are arranged in sequence.

5. The pile shoe according to claim 1, characterized in that: The first overflow hole and the second overflow hole are both provided with a second filter screen.

6. The pile shoe according to claim 1, characterized in that: The skirt plate is arc-shaped as a whole.

7. The pile shoe according to claim 1, characterized in that: The upper end of the tube passes through the base.

8. The pile shoe according to claim 1, characterized in that: The upper side and the lower side of the base are both provided with inclined surfaces, and the seepage channel runs through the inclined surfaces on both sides.

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