Wind power foundation post-grouting system and method

Abstract

The invention relates to the technical field of wind power foundations, and particularly discloses a wind power foundation post-grouting system and method, and the wind power foundation post-grouting system comprises a grouting unit and a pile foundation unit; a plurality of groups of grouting single bodies and triggering pieces are arranged, so that the grouting process is carried out from the pile bottom to the pile top, the grouting single bodies on the adjacent upper layer are automatically triggered to be opened after the grouting single bodies on the lower layer complete grouting of corresponding sections, and by means of the subsection relay grouting mode from bottom to top, slurry is forced to be in a gap between a pile body and a peripheral soil layer; continuous upward pushing pressure is formed, and the newly injected slurry in each section generates an upward pushing effect on residual air and part of uncured slurry above the slurry; therefore, air in the gap between the periphery of the pile body and the soil layer can be extruded upwards step by step and finally exhausted, and the problem that air is trapped in the middle section of the pile body and cannot be exhausted in a traditional synchronous grouting process and accordingly hollowing is caused is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power foundations, and more particularly to a wind power foundation post-grouting system and method. Background Art

[0002] With the rapid development of the wind power industry, wind turbine foundations, as the key supporting structures of wind turbines, have a direct impact on the operational safety and service life of the entire wind turbine. To enhance the bonding between wind turbine foundation piles and the soil layer, and improve the foundation's bearing capacity and stability, post-grouting technology has been widely used. Grouting is performed after the piles are formed, filling the gaps between the piles and the soil layer, expelling air and impurities, thereby improving the bearing capacity of the pile foundation and reducing the risk of settlement. Traditional post-grouting techniques for wind turbine foundations often employ full-segment synchronous grouting. This involves injecting grout into various areas around the pile body through grouting pipes after the piles are sunk into place. The grout fills the gaps between the pile and the soil, enhancing friction and engagement between the pile and the soil. However, this full-segment synchronous grouting method has the following drawbacks: First, during the grouting process, air is easily trapped in the area between the soil layer in the middle of the pile body and the pile body. Due to the lack of an effective exhaust path, the air is difficult to expel, and eventually hollowing occurs. The existence of hollowing seriously weakens the effective contact area between the pile and the soil, making it impossible to evenly transmit stress when the pile foundation bears load, resulting in local stress concentration, thereby reducing the bearing capacity and stability of the pile foundation. Secondly, during simultaneous grouting, the filling speed and pressure of the slurry in each section are difficult to control, resulting in incomplete grouting in some sections. The slurry fails to fully fill the gap around the pile to form a dense grouting reinforcement body, which in turn affects the bonding strength between the side wall of the pile foundation and the soil layer, and fails to achieve the expected reinforcement effect. Summary of the Invention

[0003] In order to overcome the above technical problems, the present invention proposes a wind power foundation post-grouting system and method.

[0004] The purpose of the present invention can be achieved through the following technical solutions: A wind power foundation post-grouting system, comprising: A grouting unit for conveying slurry comprises a slurry pump seat, wherein the input end of the slurry pump seat is connected to a slurry storage bin, and the output end of the slurry pump seat is connected to a slurry pump pipe; A driving unit is provided on one side of the grouting unit and is used to drive the slurry pump seat to suck the slurry in the slurry storage bin and pump it out from the slurry pump pipe; The pile foundation unit includes a pile body, the upper end of the pile body is connected to the grouting pipe through a grouting pipe, a grouting channel connected to the grouting pipe is axially opened in the pile body, a plurality of grouting units are sequentially arranged in the pile body from top to bottom, each group of grouting units is connected to the grouting channel, and a trigger is provided between each group of grouting units and the adjacent upper grouting units; When the lower layer grouting unit completes grouting of the section where it is located, the corresponding triggering member triggers the adjacent upper layer grouting unit to start grouting.

[0005] As a further solution of the present invention: the grouting unit includes a grouting bin circumferentially arranged on the periphery of the grouting channel, the radially inward side of the grouting bin is connected to the grouting channel, and the radially outward side of the grouting bin is provided with a grouting port; The height of the grouting bin decreases gradually and the width increases gradually from the inside to the outside in the radial direction.

[0006] As a further solution of the present invention, the triggering member includes a first annular air chamber and a second annular air chamber provided in the pile body, the first annular air chamber being connected to an adjacent lower grouting chamber, and a static pressure detection capsule being provided at the opening of the first annular air chamber; A trigger air channel is connected between the second annular air bin and the first annular air bin. A sealing plate for sealing the upper adjacent grouting bin is movably embedded in the second annular air bin. Several slurry discharge ports adapted to the grouting bin are opened circumferentially on the sealing plate. A limiting ring adapted to slide with the second annular air bin is provided at the bottom of the sealing plate.

[0007] As a further solution of the present invention: the pile foundation unit also includes a pile sleeve member movably mounted on the outside of the pile body, the pile sleeve member includes a sleeve shell that fits the outer peripheral surface of the pile body, and a plurality of first notches corresponding to each group of grouting ports are equidistantly opened on the sleeve shell, a limiting end plate is provided at the upper end of the sleeve shell, and a conical plate is provided at the lower end of the sleeve shell.

[0008] As a further solution of the present invention, the lower end of the pile body is further provided with an expansion reinforcement member, the expansion reinforcement member includes a plurality of slide rails circumferentially arranged on the outer conical surface of the pile tip, expansion plates are slidably mounted on the slide rails, a sliding cavity corresponding to the expansion plates is opened in the pile body, a push plate is fixedly connected to the expansion plate, and the push plate is slidably embedded in the sliding cavity; A filling cavity connected to the grouting channel is provided at the center of the pile body, and the bottom of the filling cavity is connected to each group of sliding cavities; a sealing ball is movably provided at the connection between the filling cavity and the grouting channel, and a supporting spring is connected between the sealing ball and the bottom of the filling cavity.

[0009] As a further solution of the present invention: a transition chamber is provided in the slurry pump seat, a slurry inlet communicating with the bottom of the slurry storage bin is provided on one side of the transition chamber, and a one-way sealing cover is rotatably installed at the slurry inlet; A piston disc is movably embedded in the transition cavity, and a transfer cavity communicating with the transition cavity and the pump slurry pipe is further provided in the pump slurry seat. A one-way flow leakage piece is provided at the connection between the transfer cavity and the transition cavity.

[0010] As a further solution of the present invention: a spoiler balloon, a conical spring and an annular airbag are arranged on the piston disc radially from the inside to the outside in sequence; a central axis air cavity connected to the spoiler balloon is opened at the center of the piston disc, and an annular air cavity is opened on the outside of the piston disc; the annular air cavity and the annular airbag are connected through a plurality of outer ring air channels, and the annular air cavity and the central axis air cavity are connected through a plurality of inner ring air channels.

[0011] As a further solution of the present invention: the one-way leakage component includes a clamping ring fixed at the connection between the transfer chamber and the transition chamber, and a blocking cover movably arranged in the transfer chamber, a pressure spring is connected between the blocking cover and the top wall of the transfer chamber, and the lower end of the blocking cover is connected to an internal support frame adapted to the clamping ring.

[0012] As a further solution of the present invention: the slurry pump pipe includes a first slurry delivery pipe connected to the transfer chamber, the end of the first slurry delivery pipe away from the transfer chamber is connected to a tee joint, the top opening of the tee joint is connected to a buffer, the side opening of the tee joint is connected to a second slurry delivery pipe, and the second slurry delivery pipe is connected to the grouting pipe; The buffer component comprises a buffer cylinder connected to a three-way joint, a buffer bag is arranged in the buffer cylinder, and an air release port is opened on the top of the buffer cylinder.

[0013] A grouting method for a post-grouting system of a wind power foundation comprises the following steps: Step 1: Drive the pile into the soil; Step 2: Start the driving unit to drive the slurry pump seat to pump the slurry in the slurry storage bin into the grouting channel; Step 3: The bottom grouting unit is grouted first. After the section is filled, the grouting pressure activates the upper grouting units from bottom to top through the trigger; Step 4: Grouting is carried out layer by layer through each grouting unit to form a continuous upward extrusion force, expel the air around the pile, and eliminate hollows.

[0014] Beneficial effects of the present invention: After the lower grouting unit in the present invention completes the grouting of the current section, the corresponding triggering member automatically triggers the opening of the adjacent upper grouting unit, thereby realizing step-by-step grouting control, ensuring that the grouting sequence is strictly advanced from the pile bottom to the pile top, and the segmented grouting forms a continuous upward extrusion force, which gradually discharges the air between the pile and the soil layer. The upper grouting is started before the lower grout solidifies, forming a seamless pressure transmission chain, effectively eliminating the hollowing defect of the wind power foundation after grouting; By setting up multiple groups of grouting units and triggering components, the grouting process is carried out in the order from the bottom of the pile to the top of the pile. After the grouting units in the lower layer complete the grouting of their corresponding sections, they automatically trigger the grouting units in the adjacent upper layer to start. This bottom-up segmented relay grouting method forces the slurry to form a continuous upward pressure in the gap between the pile body and the surrounding soil layer. Each section of newly injected slurry exerts an upward pushing effect on the residual air and part of the unsolidified slurry above it, thereby gradually squeezing the air in the gap between the pile body and the soil layer upward and eventually expelling it. This effectively solves the problem of air being trapped in the middle section of the pile body and unable to be discharged, resulting in hollowing in the traditional synchronous grouting process. In addition, the seamless pressure transmission chain formed by starting the upper grouting before the lower slurry solidifies not only effectively reduces the risk of bubbles or gaps between the slurry and the soil layer around the pile, but also the segmented grouting and continuous extrusion ensure that the grouting in each section is fuller and denser, thereby improving the uniformity and overall strength of the grouting of the entire wind turbine foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 It is a three-dimensional schematic diagram of a wind power foundation post-grouting system of the present invention; Figure 2 This is a three-dimensional schematic diagram of a wind power foundation post-grouting system of the present invention from another perspective; Figure 3 It is a structural schematic diagram of a grouting unit and a driving unit in a post-grouting system for a wind power foundation according to the present invention; Figure 4 This is a structural schematic diagram of a pile foundation unit in a wind power foundation post-grouting system of the present invention; Figure 5 A schematic diagram of the partial structure of a pile foundation unit in a post-grouting system for a wind power foundation according to the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a structural schematic diagram of a sealing plate in a post-grouting system for a wind power foundation according to the present invention; Figure 8 It is a three-dimensional schematic diagram of a sleeve pile member and a pile body in a post-grouting system for a wind power foundation according to the present invention; Figure 9 This is a structural schematic diagram of a sleeve pile member in a post-grouting system for a wind power foundation according to the present invention; Figure 10 A cross-sectional view of a sleeve pile member and a pile body in a post-grouting system for a wind power foundation according to the present invention; Figure 11 This is a structural schematic diagram of an expansion and reinforcement member in a post-grouting system for a wind power foundation according to the present invention; Figure 12 A cross-sectional view of a grouting unit in a post-grouting system for a wind power foundation according to the present invention; Figure 13 This is a transverse cross-sectional view of a pump grouting seat in a wind power foundation post-grouting system of the present invention; Figure 14 for Figure 13 Enlarged view of point B in the middle; Figure 15 for Figure 13 Enlarged view of point C in the middle; Figure 16 A longitudinal cross-sectional view of a pump grouting seat in a post-grouting system for a wind power foundation according to the present invention; Figure 17 This is a structural diagram of a pump slurry pipe and a buffer member in a post-grouting system for a wind power foundation according to the present invention; Figure 18 This is a structural schematic diagram of a drive unit in a wind power foundation post-grouting system of the present invention.

[0017] In the picture: 100, grouting unit; 110, pump seat; 120, slurry storage bin; 130, pump pipe; 131, first slurry delivery pipe; 132, three-way connector; 133, second slurry delivery pipe; 140, transition chamber; 141, one-way cover; 142, slurry inlet; 150, piston disc; 151, conical spring; 152, flow-turbulating balloon; 153, central axis air chamber; 154, annular air chamber; 155, annular air chamber; 156, outer ring air channel; 157, inner ring air channel; 160, balance chamber; 161, connecting port; 170, transfer chamber; 180, one-way flow discharge member; 181, snap ring; 182, plugging cover; 183, pressure spring; 184, inner support frame; 190, buffer member; 191, buffer cylinder; 192, buffer bag; 193, air discharge port; 200, drive unit; 210, housing; 220, drive shaft; 221, drive gear; 230, transmission shaft; 231, transmission gear plate; 232, eccentric plate; 240, transmission belt plate; 250, rocker arm; 251, ring; 260, slide; 270, reciprocating rod; 300, pile foundation unit; 310, pile body; 320, grouting pipe; 330, grouting channel; 340, grouting unit; 341, grouting chamber; 342, grouting port; 350, trigger member; 351, first annular air chamber; 352, static pressure detection capsule; 353, second annular air chamber; 354, trigger air channel; 355, sealing plate; 356, slurry discharge port; 357, limiting ring; 360, expansion reinforcement member; 361, slide rail; 362, expansion plate; 363, slide cavity; 364, push plate; 365, filling cavity; 366, sealing ball; 367, support spring; 370, pile sleeve; 371, sleeve; 372, first notch; 373, limiting end plate; 374, conical plate; 375, second notch. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0019] See also Figure 1 and Figure 2 , the present invention discloses a wind power foundation post-grouting system, comprising a grouting unit 100, a driving unit 200 and a pile foundation unit 300; See also Figure 3 The grouting unit 100 is used to transport slurry, and includes a slurry pump seat 110. The input end of the slurry pump seat 110 is connected to a slurry storage bin 120, and the output end of the slurry pump seat 110 is connected to a slurry pump pipe 130. The driving unit 200 is provided on one side of the grouting unit 100, and is used to drive the slurry pump seat 110 to suck the slurry in the slurry storage bin 120 and pump it out from the slurry pump pipe 130. See also Figure 4 The pile foundation unit 300 includes a pile body 310, the upper end of the pile body 310 is connected to the pump grouting pipe 130 through a grouting pipe 320, and a grouting channel 330 connected to the grouting pipe 320 is axially opened in the pile body 310. A number of grouting monomers 340 are arranged in sequence from top to bottom in the pile body 310, and each group of grouting monomers 340 is connected to the grouting channel 330. A trigger part 350 is provided between each group of grouting monomers 340 and its adjacent upper grouting monomers 340; when the lower grouting monomer 340 completes grouting of its section, the corresponding trigger part 350 triggers its adjacent upper grouting monomer 340 to start grouting.

[0020] Specifically, pile driving construction is first carried out in the wind power foundation construction area, and the pile body 310 is driven into the soil layer. Then, the driving unit 200 drives the slurry pump seat 110 to suck out the slurry in the slurry storage bin 120, and then pumps it into the grouting channel 330 of the pile body 310 through the slurry pump pipe 130 and the grouting pipe 320; In the initial state, only the grouting monomers 340 of the lowest layer are opened, and the other grouting monomers 340 remain closed. The slurry in the grouting channel 330 is first grouted to the periphery of the pile body 310 of the lowest section through the grouting monomers 340 of the lowest layer. When the section is filled with slurry, the triggering member 350 on the upper layer automatically triggers the grouting monomers 340 of the upper layer adjacent to it to open, thereby starting grouting to the corresponding section through the grouting monomers 340 of the upper layer; this is repeated to achieve segmented grouting of the periphery of the pile body 310 from bottom to top, so that the air between the pile body 310 and the outer soil layer is squeezed out step by step, effectively avoiding hollowing defects in the grouting of the periphery of the pile body 310 during the post-grouting process.

[0021] It is worth noting that after the lower grouting unit 340 in the present invention completes grouting in the current section, the corresponding trigger 350 automatically triggers the opening of the adjacent upper grouting unit 340, thereby realizing step-by-step grouting control, ensuring that the grouting sequence is strictly advanced from the bottom of the pile to the top of the pile. The segmented grouting forms a continuous upward extrusion force, gradually discharging the air between the pile and the soil layer. The upper grouting is started before the lower grout solidifies, forming a seamless pressure transmission chain, effectively eliminating the hollowing defect of the wind turbine foundation after grouting. By providing multiple groups of grouting units 340 and triggering members 350, the grouting process is carried out in order from the bottom of the pile to the top of the pile. After the lower grouting units 340 complete the grouting of their corresponding sections, they automatically trigger the grouting units 340 of the adjacent upper layers to open. This bottom-up segmented relay grouting method forces the slurry to form a continuous upward pressure in the gap between the pile body 310 and the surrounding soil layer. Each section of newly injected slurry exerts an upward pushing effect on the residual air and part of the unsolidified slurry above it, thereby gradually squeezing the air in the gap between the periphery of the pile body 310 and the soil layer upward and eventually expelling it, effectively solving the problem of air being trapped in the middle section of the pile body and unable to be discharged, resulting in hollowing in the traditional synchronous grouting process. In addition, the seamless pressure transmission chain formed by starting the upper grouting before the lower slurry solidifies not only effectively reduces the risk of bubbles or gaps between the slurry and the soil layer around the pile, but also the segmented grouting and continuous extrusion ensure that the grouting in each section is fuller and denser, thereby improving the uniformity and overall strength of the grouting of the entire wind turbine foundation.

[0022] In one embodiment, see Figure 5The grouting unit 340 includes a grouting bin 341 circumferentially arranged on the periphery of the grouting channel 330. The radially inward side of the grouting bin 341 is connected to the grouting channel 330, and the radially outward side of the grouting bin 341 is provided with a grouting port 342. The height of the grouting bin 341 gradually decreases and the width gradually increases from the inside to the outside. Specifically, the grouting bin 341 is configured to have a structure that is high and narrow on the inside and low and wide on the outside, so that the radial flow cross-sectional area of the entire grouting bin 341 from the inside to the outside remains basically consistent; the grouting bin 341 is high and narrow on the inside, which can ensure that the slurry in the grouting channel 330 flows smoothly and quickly into the grouting bin 341 to ensure the responsiveness of the segmented grouting; the grouting bin 341 is low and wide on the outside, which can achieve the slurry in the grouting bin 341 to be dispersed to various positions on the periphery of the pile body 310 as much as possible when flowing out, thereby achieving full circumferential coverage of the section by the slurry and avoiding local accumulation of slurry.

[0023] It should be noted that the grouting bin 341 adopts a tapered cross-section design with a high and narrow inner side and a low and wide outer side, so that the radial flow cross-sectional area of the entire grouting bin 341 remains basically consistent, thereby effectively reducing the resistance of the slurry flowing from the grouting channel 330 into the grouting bin 341, ensuring that the slurry can quickly and smoothly enter the grouting bin 341, and improving the response speed and grouting efficiency of the segmented grouting. The high and narrow inner side of the grouting chamber 341 provides a larger flow space and smaller contact surface resistance near the entrance of the grouting channel 330, allowing the slurry to flow from the central grouting channel 330 into the grouting chamber 341 efficiently and with low resistance. This ensures that when the trigger 350 is activated, the slurry can immediately and fully enter the target grouting section, meeting the timeliness requirements of the segmented relay grouting. The short and wide design of the outer side of the grouting bin 341 greatly expands the diffusion range of the slurry in the radial outward direction of the pile body 310. When the slurry flows out through the grouting port 342, this structure forces the slurry to be sprayed outward in a wider fan shape at the outlet, thereby evenly covering a larger range of soil gaps around the pile body 310, ensuring all-round and dead-angle grouting filling of the periphery of the pile body 310 in the section corresponding to the grouting unit 340, effectively avoiding the problem of concentrated accumulation or uneven coverage of slurry in local areas, and minimizing the risk of unfilled gaps inside or at the edge of the section due to uneven distribution of slurry, providing a structural basis for eliminating hollowing defects.

[0024] Further, see Figure 5 、 Figure 6 and Figure 7The triggering member 350 includes a first annular air chamber 351 and a second annular air chamber 353 provided in the pile body 310. The first annular air chamber 351 is in communication with the adjacent lower grouting chamber 341. A static pressure detection capsule 352 is provided at the opening of the first annular air chamber 351. A triggering air channel 354 is connected between the second annular air chamber 353 and the first annular air chamber 351. A sealing plate 355 for sealing the upper adjacent grouting chamber 341 is movably embedded in the second annular air chamber 353. A plurality of grouting ports 356 adapted to the grouting chamber 341 are provided on the circumference of the sealing plate 355. A limiting ring 357 slidably adapted to the second annular air chamber 353 is provided at the bottom of the sealing plate 355. Specifically, in the initial state, the sealing plate 355 is located at the bottom of the second annular air chamber 353. At this time, the slurry discharge port 356 on the sealing plate 355 is just offset from the corresponding grouting chamber 341, so that the sealing plate 355 can completely block the grouting chamber 341. When the grouting of one group of grouting units 340 is completed, the area around the grouting units 340 of this group is completely filled with slurry, which causes the static pressure of the slurry in the grouting bin 341 of this group of grouting units 340 to increase. Then the slurry in the grouting bin 341 begins to squeeze the static pressure detection capsule 352, causing the static pressure detection capsule 352 to retract into the first annular air bin 351. The static pressure detection capsule 352 presses the gas in the first annular air bin 351 into the bottom of the second annular air bin 353 through the trigger air channel 354, thereby pushing the sealing plate 355 upward, so that the slurry discharge port 356 on the sealing plate 355 coincides with the upper grouting bin 341, and then the upper grouting bin 341 starts grouting.

[0025] It should be noted that, by providing the first annular air chamber 351 in communication with the lower grouting chamber 341 and the static pressure detection capsule 352 at its opening, the static pressure detection capsule 352 is triggered to be compressed back by utilizing the physical property that the static pressure of the slurry in the grouting chamber 341 increases after the grouting of the lower section is completed, thereby realizing automatic detection of the completion status of the grouting of the lower layer; When the static pressure detection capsule 352 retracts, the gas in the first annular gas chamber 351 is pressed into the bottom of the second annular gas chamber 353 through the trigger air channel 354. This process converts the static pressure of the slurry into gas pressure, forming a power source for driving the upper mechanism. The gas pressed into the bottom of the second annular gas chamber 353 pushes the sealing plate 355 upward, so that the preset slurry discharge port 356 on the sealing plate 355 is aligned with the upper grouting chamber 341, thereby releasing the blockage of the upper grouting chamber 341 and realizing the instant opening of the grouting channel 330, ensuring the immediacy and accuracy of the relay grouting. In the initial state, the sealing plate 355 is located at the bottom of the second annular air chamber 353, and its slurry discharge port 356 is offset from the grouting chamber 341 to prevent accidental leakage of slurry; after being triggered, the sealing plate 355 moves upward to make the slurry discharge port 356 overlap with the grouting chamber 341, forming a smooth slurry outflow channel, ensuring the smooth start of upper grouting.

[0026] For further information, see Figure 8 and Figure 9 The pile foundation unit 300 further includes a pile sleeve 370 movably sleeved on the outside of the pile body 310. The pile sleeve 370 includes a sleeve 371 that fits the outer peripheral surface of the pile body 310. The sleeve 371 is provided with a plurality of first notches 372 equidistantly spaced and corresponding to the groups of grouting ports 342. A limiting end plate 373 is provided at the upper end of the sleeve 371, and a conical plate 374 is provided at the lower end of the sleeve 371. Specifically, see Figure 10 In the initial state, the conical plate 374 at the lower end of the casing 371 fits against the outer surface of the pile tip at the lower end of the pile body 310. At this time, each group of first notches 372 and the corresponding grouting openings 342 are staggered with each other, so that the casing 371 can block each group of grouting openings 342 on the outer peripheral surface of the pile body 310, preventing peripheral soil from entering the grouting chamber 341 through the grouting openings 342 during pile sinking and affecting subsequent grouting. At the same time, there is a gap between the limiting end plate 373 and the top end surface of the pile body 310. When the pile is sunk, the pile sleeve 370 is further struck downward relative to the pile body 310, so that the sleeve 371 moves axially downward relative to the pile body 310 until the limiting end plate 373 fits with the top end surface of the pile body 310. At this time, each group of first notches 372 is just aligned and connected with the corresponding grouting ports 342, thereby realizing the opening of the grouting ports 342 for subsequent grouting.

[0027] It is worth noting that in the initial state, the casing 371 is tightly fitted to the outer surface of the pile tip at the lower end of the pile body 310 through its tapered plate 374. At the same time, the first notch 372 and the grouting opening 342 are offset from each other. At this time, the casing 371 completely covers and blocks all the grouting openings 342 on the periphery of the pile body 310, effectively preventing the surrounding soil, gravel or groundwater from invading the grouting chamber 341 through the grouting openings 342 during the pile sinking process, avoiding blockage or contamination of the channel and ensuring the reliability of subsequent grouting. After the pile is sunk, the pile sleeve 370 is knocked downward to move it axially downward relative to the pile body 310 until the limit end plate 373 is in contact with the top end surface of the pile body 310. During this process, all the first notches 372 are precisely aligned with and connected to the corresponding grouting ports 342, achieving one-time, equidistant, and full coverage opening of the grouting ports 342 of all grouting units 340, ensuring that subsequent segmented grouting can be started immediately. The initial gap between the limiting end plate 373 and the top end surface of the pile body 310 provides a preset travel space for the pile sleeve 370 to move downward; when the downward movement ends, the limiting end plate 373 fits with the top surface of the pile to form a hard mechanical stop, accurately defining the final position of the sleeve 371, and ensuring the accuracy and consistency of the alignment of all the first notches 372 with the grouting ports 342.

[0028] Also, see Figure 11 , the lower end of the pile body 310 is also provided with an expansion reinforcement 360, and the expansion reinforcement 360 includes a plurality of slide rails 361 circumferentially arranged on the outer conical surface of the pile tip of the pile body 310, and an expansion plate 362 is slidably mounted on the slide rail 361, and a sliding cavity 363 corresponding to the expansion plate 362 is opened in the pile body 310, and a push plate 364 is fixedly connected to the expansion plate 362, and the push plate 364 is slidably embedded in the sliding cavity 363; a filling cavity 365 connected to the grouting channel 330 is opened at the center of the pile body 310, and the bottom of the filling cavity 365 is connected to each group of sliding cavities 363; a sealing ball 366 is movably provided at the connection between the filling cavity 365 and the grouting channel 330, and a supporting spring 367 is connected to the sealing ball 366 and the bottom of the filling cavity 365; When the pile is sunk, the sleeve 371 is pressed downwardly to align the first notch 372 with the corresponding grouting port 342, and the second notch 375 of each group is also aligned with the corresponding expansion plate 362, so that the subsequent expansion plate 362 can be smoothly ejected from the second notch 375. When the segmented grouting is completed, since each section of the periphery of the pile body 310 is filled with slurry, the static pressure of the slurry in the grouting channel 330 begins to increase until the static pressure can overcome the supporting force applied by the supporting spring 367 to the sealing ball 366, thereby pushing the sealing ball 366 downward, and the slurry in the grouting channel 330 enters the filling cavity 365, and then the slurry enters each group of sliding cavities 363, thereby pushing each group of push plates 364 to slide upward, and synchronously driving each group of expansion plates 362 to pop out upward along the slide rail 361, so that the expansion plates 362 are inclined upward and penetrate into the outer soil layer, and the pile body 310 is further fixed in the soil layer by using multiple groups of expansion plates 362 arranged circumferentially, thereby improving the connection strength between the pile body 310 and the outer soil layer of the wind power foundation.

[0029] It should be noted that, in the initial state, the conical plate 374 of the pile sleeve 370 tightly wraps the expansion plate 362 in the contracted state, and the second notch 375 is offset from the expansion plate 362, thereby isolating the expansion plate 362 from direct contact with the external soil. This effectively prevents soil from getting stuck in the slide rail 361 or obstructing the movement of the expansion plate 362 during the pile sinking process, thereby ensuring the reliability of the subsequent expansion function. When the segmented grouting is completed and the static pressure of the slurry in the grouting channel 330 rises to a set threshold, the pressure overcomes the elastic force of the support spring 367, pushing the sealing ball 366 downward, releasing the blockage of the filling cavity 365, and the slurry then enters the filling cavity 365 and the sliding cavity 363, driving the expansion plate 362 to trigger the mechanism through the slurry pressure; The slurry pressure pushes the push plates 364 in each sliding cavity 363 to slide upward, which in turn drives the expansion plates 362 to pop out synchronously and tilted upward along the track of the slide rail 361. Multiple groups of expansion plates 362 are distributed circumferentially and penetrate the soil layer around the pile end at a certain angle, forming an umbrella-shaped mechanical anchoring structure, which enhances the pull-out and lateral displacement resistance of the pile body 310 and the soil. When the pile sleeve 370 is moved down after the pile is sunk, the second notch 375 and the first notch 372 are synchronously and accurately aligned with the corresponding structure. The opening of the second notch 375 provides an unobstructed channel for the expansion plate 362 to pop out, ensuring that it can smoothly penetrate the soil layer and avoid the sleeve 371 hindering the expansion action.

[0030] In yet another embodiment, see Figure 12 and Figure 13 A transition chamber 140 is provided in the slurry pump seat 110. A slurry inlet 142 communicating with the bottom of the slurry storage bin 120 is provided on one side of the transition chamber 140. A one-way sealing cover 141 is rotatably installed at the slurry inlet 142. A piston disc 150 is movably embedded in the transition chamber 140. A transfer chamber 170 communicating with the transition chamber 140 and the slurry pump pipe 130 is further provided in the slurry pump seat 110. A one-way flow discharge member 180 is provided at the connection between the transfer chamber 170 and the transition chamber 140. Specifically, the piston disc 150 is driven to reciprocate in the transition chamber 140 by the drive unit 200. When the piston disc 150 moves toward the end away from the slurry storage bin 120, the one-way leakage piece 180 is closed and the one-way cover 141 is opened, thereby drawing the slurry in the slurry storage bin 120 into the transition chamber 140; then, when the piston disc 150 moves toward the end close to the slurry storage bin 120, the one-way cover 141 is closed and the one-way leakage piece 180 is opened, thereby using the piston disc 150 to squeeze the slurry in the transition chamber 140 into the transfer chamber 170, and then the slurry enters the slurry pump pipe 130 through the transfer chamber 170 and is pumped out.

[0031] Further, see Figure 13In order to enable the piston disc 150 to reciprocate in a sealed state in the transition chamber 140, a balancing chamber 160 is formed in the pump slurry seat 110 at one end away from the slurry storage bin 120, and a communication port 161 communicating with the outside is formed at the upper end of the balancing chamber 160; When the piston disc 150 reciprocates, since the balancing chamber 160 is always in communication with the outside, the air pressure on the side of the piston disc 150 located in the balancing chamber 160 can be kept balanced at all times.

[0032] For further information, see Figure 13 and Figure 14 The piston disc 150 is provided with a flow-disturbing balloon 152, a conical spring 151 and an annular airbag 154 in order from the inside to the outside in radial direction. A central axis air cavity 153 communicating with the flow-disturbing balloon 152 is provided at the center of the piston disc 150. An annular air cavity 155 is provided on the outside of the piston disc 150. The annular air cavity 155 is communicated with the annular airbag 154 via a plurality of outer ring air passages 156, and the annular air cavity 155 is communicated with the central axis air cavity 153 via a plurality of inner ring air passages 157. Specifically, when the piston disc 150 moves toward one end of the slurry storage bin 120, the conical spring 151 contacts the end of the transition chamber 140, thereby causing the conical spring 151 to be axially compressed and folded until the conical spring 151 contacts the annular airbag 154. The compressed conical spring 151 squeezes the annular airbag 154, so that the gas in the annular airbag 154 passes through the outer ring air channel 156, the annular air cavity 155, the inner ring air channel 157 and the central axis air cavity 153 in sequence, and finally enters the spoiler balloon 152, thereby causing the spoiler balloon 152 to expand. The expanded spoiler balloon 152 is used to perform a dual disturbance on the slurry in the transition chamber 140 in the radial and axial directions, thereby promoting uniform dispersion of the slurry. When the piston disc 150 moves toward the end away from the slurry storage bin 120, the conical spring 151 disengages from the end of the transition chamber 140, and then the conical spring 151 automatically stretches axially and bounces open, and the slurry in the transition chamber 140 is disturbed again by the stretched conical spring 151; this reciprocating action can be used to achieve multiple turbulence effects on the slurry in the transition chamber 140 by the periodic contraction action of the turbulence balloon 152 and the conical spring 151, thereby avoiding the stratification and sedimentation of the slurry and improving the consistency of the segmented grouting slurry filling effect.

[0033] It is worth noting that when the piston disc 150 moves toward the slurry storage bin 120, the conical spring 151 contacts the end of the transition chamber 140, causing axial compression and folding, thereby squeezing the annular airbag 154. The gas passes through the outer ring air channel 156, the annular air cavity 155, the inner ring air channel 157, and the central axis air cavity 153 and is injected into the flow-disturbing balloon 152, causing the flow-disturbing balloon 152 to expand, generating a combined disturbance of radial expansion and axial pushing on the slurry in the transition chamber 140. When the piston disc 150 moves away from the slurry storage bin 120, the conical spring 151 automatically extends axially and bounces off after disengagement, and the spring blades form axial scattering stirring on the slurry; through the reciprocating motion of the piston, the dual disturbance mode of expansion disturbance and spring stirring is periodically triggered, which completely breaks the steady state of the slurry flow field, and the expansion body forms an asymmetric turbulent zone in the slurry, forcing the slurry particles to diffuse laterally. When the conical spring 151 extends, it generates high-speed shear flow, and when it is compressed, it forms local high-pressure turbulence, which continuously destroys the sedimentation trend and flocculation structure of the solid particles in the slurry, ensuring that the slurry density and composition in the transition chamber 140 are highly uniform, and avoiding cement segregation or water floating.

[0034] Also, see Figure 13 and Figure 15 The one-way flow leakage member 180 includes a snap ring 181 fixed at the connection between the transfer chamber 170 and the transition chamber 140, and a blocking cover 182 movably arranged in the transfer chamber 170. A pressure spring 183 is connected between the blocking cover 182 and the top wall of the transfer chamber 170. The lower end of the blocking cover 182 is connected to an inner support frame 184 adapted to the snap ring 181. Specifically, in the initial state, due to the elastic force of the pressing spring 183, the blocking cover 182 is always pressed against the snap ring 181, and the inner support frame 184 is also embedded in the snap ring 181, so that the blocking cover 182 is used to block the connection between the transfer chamber 170 and the transition chamber 140; When the piston disc 150 squeezes the slurry in the transition chamber 140, the squeezing force can overcome the elastic force of the pressure spring 183, thereby pushing the blocking cover 182 upward, and the inner support frame 184 slides out from the retaining ring 181, so that the slurry in the transition chamber 140 enters the transfer chamber 170 through the hollow part of the inner support frame 184, so as to realize the pumping out of the slurry.

[0035] Since the piston disc 150 has a reciprocating stroke, when the piston disc 150 squeezes out the slurry in the transition chamber 140, the flow rate of the slurry varies to a certain extent, which can easily cause an impact on the pump slurry pipe 130. For this reason, please refer to Figure 16 The pump slurry pipe 130 includes a first slurry delivery pipe 131 connected to the transfer chamber 170. The end of the first slurry delivery pipe 131 away from the transfer chamber 170 is connected to a tee joint 132. The top opening of the tee joint 132 is connected to a buffer 190. The side opening of the tee joint 132 is connected to a second slurry delivery pipe 133. The second slurry delivery pipe 133 is connected to the grouting pipe 320. See also Figure 17 The buffer member 190 includes a buffer cylinder 191 connected to the tee connector 132, a buffer bag 192 is provided in the buffer cylinder 191, and an air release port 193 is opened on the top of the buffer cylinder 191; Specifically, when the slurry in the transfer chamber 170 enters the second slurry pipe 133 through the first slurry pipe 131, if the flow rate of the slurry is large, part of the slurry will be temporarily diverted into the buffer cylinder 191, and at the same time the buffer bag 192 passively expands to squeeze the upper air of the buffer cylinder 191 out of the air vent 193; when the slurry flow rate decreases, the slurry retained in the buffer cylinder 191 can flow downward and be replenished into the subsequent second slurry pipe 133; in this way, the buffer member 190 can be used to buffer the slurry during the pumping process.

[0036] It is worth noting that when the piston disc 150 squeezes the slurry, causing an instantaneous high-pressure and high-speed flow to flow into the first slurry delivery pipe 131, part of the slurry is diverted to the buffer cylinder 191, and the buffer bag 192 expands to absorb the excess kinetic energy of the slurry. At the same time, the expanded bag discharges the air at the top of the buffer cylinder 191 through the air vent 193, thereby accommodating the slurry without resistance. When the slurry flow rate decreases, the buffer bag 192 contracts to press the temporarily stored slurry back to the three-way connector 132 and replenish it to the second slurry delivery pipe 133, achieving the effect of peak shaving and valley filling, and converting the pulsed slurry flow into a stable output with a near-uniform speed. The flexible deformation mechanism of the buffer bag 192 can form an elastic buffer for sudden changes in slurry pressure, preventing high-speed slurry flow from directly impacting the walls and connectors of the pump slurry pipe 130 and the grouting pipe 320, eliminating the water hammer effect and pipeline impact, and significantly reducing the vibration, noise and structural fatigue risks caused by periodic pressure shocks in the pipeline system. At the same time, it protects the downstream trigger 350 from pressure spikes, ensuring its operational reliability. The three-way joint 132 integrates a buffer diversion. When the slurry flow passes through the three-way joint 132, the overpressure part is automatically diverted to the buffer cylinder 191, maintaining the slurry pressure and flow in the second slurry pipe 133 stable, providing continuous and stable slurry supply for the segmented grouting of the pile foundation unit 300, avoiding pressure fluctuations that cause uneven slurry discharge from the grouting unit 340 or blockage of the grouting port 342, and improving the consistency of segmented filling.

[0037] See also Figure 12 and Figure 18 , the drive unit 200 includes a shell 210 fixedly connected to the pump slurry seat 110, and a drive shaft 220 and a transmission shaft 230 are rotatably installed in the shell 210, and a drive gear 221 is sleeved on the drive shaft 220, and a transmission toothed disk 231 meshing with the drive gear 221 is sleeved on the transmission shaft 230, and a transmission belt disk 240 is connected to one end of the drive shaft 220; a slide cylinder 260 is also slidably installed in the shell 210, and a reciprocating rod 270 for driving the piston disk 150 is connected to the slide cylinder 260, and a rocker rod 250 is rotatably connected in the slide cylinder 260, and a ring 251 is provided at one end of the rocker rod 250 away from the slide cylinder 260, and an eccentric disk 232 eccentrically provided on the transmission toothed disk 231 is adapted to rotate with the ring 251; Specifically, an external motor or the like is connected to the drive belt disc 240 through a transmission belt, thereby driving the drive belt disc 240 and the drive shaft 220 to rotate, and under the meshing transmission of the drive gear 221 and the transmission toothed disc 231, the drive shaft 230 and the transmission toothed disc 231 are driven to rotate, and under the transmission action of the eccentric disc 232 and the ring 251, the rocker arm 250 is driven to swing back and forth, and at the same time, the slide cylinder 260 is driven to slide back and forth in the horizontal direction, and then the piston disc 150 is driven to slide back and forth horizontally in the transition chamber 140 through the reciprocating rod 270 to achieve continuous suction and pumping of the slurry.

[0038] The present invention also provides a grouting method for a post-grouting system of a wind power foundation, comprising the following steps: Step 1: driving the pile 310 into the soil layer; Step 2: Start the driving unit 200 to drive the slurry pump seat 110 to pump the slurry in the slurry storage bin 120 into the grouting channel 330; Step 3: The bottom grouting unit 340 is grouted first. After the section is filled, the grouting pressure activates the upper grouting units 340 from bottom to top through the trigger 350. Step 4: Grouting is performed layer by layer through each grouting unit 340 to form a continuous upward squeezing force, expel the air around the pile, and eliminate hollows.

[0039] The above describes the specific embodiments of the present invention, but the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art can also make many forms, all of which are protected by the present invention.

Claims

1. A wind power foundation post-grouting system, characterized in that: include: A grouting unit (100) is used for conveying slurry, comprising a slurry pump seat (110), wherein an input end of the slurry pump seat (110) is connected to a slurry storage bin (120), and an output end of the slurry pump seat (110) is connected to a slurry pump pipe (130); A driving unit (200) is provided on one side of the grouting unit (100) and is used to drive the slurry pump seat (110) to suck the slurry in the slurry storage bin (120) and pump it out from the slurry pump pipe (130); A pile foundation unit (300) comprises a pile body (310), the upper end of the pile body (310) being connected to a grouting pipe (130) via a grouting pipe (320), a grouting channel (330) being axially opened in the pile body (310) and communicating with the grouting pipe (320), a plurality of grouting units (340) being sequentially arranged in the pile body (310) from top to bottom, each group of grouting units (340) being communicated with the grouting channel (330), and a triggering member (350) being arranged between each group of grouting units (340) and its adjacent upper layer grouting units (340); When the lower layer grouting monomer (340) completes grouting of the section in which it is located, the corresponding triggering member (350) triggers the adjacent upper layer grouting monomer (340) to start grouting.

2. A wind power foundation post-grouting system according to claim 1, characterized in that: The grouting unit (340) comprises a grouting bin (341) circumferentially arranged on the periphery of the grouting channel (330); the radially inward side of the grouting bin (341) is in communication with the grouting channel (330); and the radially outward side of the grouting bin (341) is provided with a grouting port (342); The grouting bin (341) has a height that gradually decreases and a width that gradually increases from the inside to the outside in the radial direction.

3. A wind power foundation post-grouting system according to claim 2, characterized in that: The triggering member (350) comprises a first annular air chamber (351) and a second annular air chamber (353) opened in the pile body (310); the first annular air chamber (351) is in communication with the adjacent lower grouting chamber (341); a static pressure detection capsule (352) is provided at the opening of the first annular air chamber (351); A trigger air channel (354) is connected between the second annular air bin (353) and the first annular air bin (351). A sealing plate (355) for sealing the upper adjacent grouting bin (341) is movably embedded in the second annular air bin (353). A plurality of grouting openings (356) adapted to the grouting bin (341) are opened on the circumference of the sealing plate (355). A limiting ring (357) adapted to slide with the second annular air bin (353) is provided at the bottom of the sealing plate (355).

4. A wind power foundation post-grouting system according to claim 2, characterized in that: The pile foundation unit (300) further comprises a pile sleeve member (370) movably sleeved on the outside of the pile body (310), the pile sleeve member (370) comprising a sleeve (371) fitted with the outer peripheral surface of the pile body (310), a plurality of first notches (372) corresponding to the groups of grouting ports (342) being equidistantly formed on the sleeve (371), a limiting end plate (373) being provided at the upper end of the sleeve (371), and a conical plate (374) being provided at the lower end of the sleeve (371).

5. A wind power foundation post-grouting system according to claim 1, characterized in that: The lower end of the pile body (310) is further provided with an expansion reinforcement member (360), the expansion reinforcement member (360) comprising a plurality of slide rails (361) circumferentially arranged on the outer conical surface of the pile tip of the pile body (310), an expansion plate (362) being slidably mounted on the slide rails (361), a slide cavity (363) corresponding to the expansion plate (362) being provided in the pile body (310), a push plate (364) being fixedly connected to the expansion plate (362), and the push plate (364) being slidably embedded in the slide cavity (363); A filling cavity (365) communicating with the grouting channel (330) is provided at the center of the pile body (310), and the bottom of the filling cavity (365) is communicated with each group of sliding cavities (363). A sealing ball (366) is movably provided at the connection point between the filling cavity (365) and the grouting channel (330), and a supporting spring (367) is connected to the sealing ball (366) and the bottom of the filling cavity (365).

6. A wind power foundation post-grouting system according to claim 1, characterized in that: A transition chamber (140) is provided in the slurry pump seat (110), a slurry inlet (142) communicating with the bottom of the slurry storage bin (120) is provided on one side of the slurry inlet (142), and a one-way sealing cover (141) is rotatably mounted on the slurry inlet (142); A piston disc (150) is movably embedded in the transition chamber (140), and a transfer chamber (170) communicating with the transition chamber (140) and the pumping slurry pipe (130) is further provided in the pumping slurry seat (110). A one-way leakage member (180) is provided at the connection between the transfer chamber (170) and the transition chamber (140).

7. A wind power foundation post-grouting system according to claim 6, characterized in that: The piston disc (150) is provided with a flow-disturbing balloon (152), a conical spring (151) and an annular airbag (154) in order from the inside to the outside in radial direction. A central axis air cavity (153) communicating with the flow-disturbing balloon (152) is provided at the center of the piston disc (150). An annular air cavity (155) is provided on the outside of the piston disc (150). The annular air cavity (155) is communicated with the annular airbag (154) via a plurality of outer annular air channels (156), and the annular air cavity (155) is communicated with the central axis air cavity (153) via a plurality of inner annular air channels (157).

8. A wind power foundation post-grouting system according to claim 6, characterized in that: The one-way leakage member (180) includes a snap ring (181) fixed at the connection point between the transfer chamber (170) and the transition chamber (140) and a plug cover (182) movably arranged in the transfer chamber (170), a pressure spring (183) is connected between the plug cover (182) and the top wall of the transfer chamber (170), and the lower end of the plug cover (182) is connected to an inner support frame (184) adapted to the snap ring (181).

9. A wind power foundation post-grouting system according to claim 6, characterized in that: The pump slurry pipe (130) includes a first slurry delivery pipe (131) in communication with the transfer chamber (170); one end of the first slurry delivery pipe (131) away from the transfer chamber (170) is connected to a three-way joint (132); the top opening of the three-way joint (132) is connected to a buffer (190); the side opening of the three-way joint (132) is connected to a second slurry delivery pipe (133); the second slurry delivery pipe (133) is in communication with the grouting pipe (320); The buffer component (190) comprises a buffer cylinder (191) connected to the three-way joint (132), a buffer bag (192) is provided in the buffer cylinder (191), and an air release port (193) is provided at the top of the buffer cylinder (191).

10. A grouting method using the wind power foundation post-grouting system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: driving the pile body (310) into the soil layer; Step 2: Start the driving unit (200) to drive the slurry pump seat (110) to pump the slurry in the slurry storage bin (120) into the grouting channel (330); Step 3: The bottom grouting unit (340) is first grouted. After the section is filled, the grouting pressure activates the upper grouting unit (340) from bottom to top through the trigger (350); Step 4: Grouting is performed layer by layer through each grouting unit (340) to form a continuous upward squeezing force, expel the air around the pile, and eliminate hollows.

Images