A vertical grouting channel structure of a pile body of a precast pile and a construction method thereof

Abstract

The application provides a pile body vertical grouting channel structure of a precast pile and a construction method thereof, and belongs to the technical field of building precast piles. The pile body vertical grouting channel structure comprises a reinforcement cage, a grouting pipe, a guide component, a buoyancy frame assembly, a side grouting component and a side grouting control assembly. The grouting pipe and the guide component are staggered in the reinforcement cage. The buoyancy frame assembly is slidably connected to the guide component through a guide sliding seat. The side sealing plate in the side grouting control assembly is used for closing the side grouting port. The buoyancy frame assembly is driven to float up by the buoyancy generated by concrete pouring. The initial conical insertion column at the top of the buoyancy frame assembly is sequentially inserted into and pushed by the engagement insertion holes of the side grouting control assemblies at all levels, so that the side grouting port is forced to be opened step by step from bottom to top, thereby achieving automatic and accurate control of the grouting sequence and ensuring the layered effective reinforcement of the soil body at the pile end and the pile side. The mechanical triggering has high reliability, and the buoyancy frame and the side grouting control assembly can be recycled and reused as a whole, which significantly improves the construction quality and reliability.

Description

Technical Field

[0001] This invention relates to the field of precast pile technology, and in particular to a vertical grouting channel structure for a precast pile and its construction method. Background Technology

[0002] In the field of building pile foundation engineering, post-grouting technology for precast piles (such as prestressed concrete pipe piles and bored cast-in-place piles) is an effective means to improve the bearing capacity of a single pile and control settlement. This technology involves pre-embedding vertical grouting channels in the pile body, and after the pile body is formed, injecting cement grout under high pressure into the pile tip and the soil on the side of the pile, thereby solidifying and enhancing the pile-soil interaction.

[0003] Existing grouting methods primarily rely on pressure differentials or manual experience to control grout flow, aiming to achieve a bottom-up reinforcement sequence. However, in actual construction, grout often flows out in large quantities first along the path of least resistance, resulting in insufficient grouting at the pile tip and deep pile side areas, creating reinforcement blind spots. This "short-circuit effect" severely impacts the uniformity and predictability of the grouting effect, reducing load-bearing capacity. Furthermore, even existing technologies that use external traction on the ground to sequentially trigger grouting valves suffer from disconnected triggering actions from the actual concrete pouring process, failing to achieve precise spatiotemporal coordination. Simultaneously, the reliance on manual operation, especially in deep-hole environments, significantly increases construction complexity and safety risks. Summary of the Invention

[0004] One of the objectives of this invention is to provide a vertical grouting channel structure for precast piles, which overcomes the problem of uncontrollable grouting sequence in existing post-grouting technology for precast piles. It can utilize the buoyancy generated by the concrete pouring itself as a power source, and through the cooperation of mechanical mechanisms, force the grouting port to open precisely and automatically from bottom to top, fundamentally ensuring that the pile end and the soil on the side of the pile are fully reinforced in a scientific order, and eliminating grouting short circuits.

[0005] The objective of this invention is achieved through the following technical solution: a vertical grouting channel structure for a precast pile, comprising a reinforcing cage, a grouting pipe, a guide component, a buoyancy frame assembly, a side grouting component, and a side grouting control assembly. The buoyancy frame assembly includes a buoyancy box and a second notch. The side grouting component includes a side grouting port. The side grouting control assembly includes a central frame, a side sealing plate, and a connecting hole.

[0006] The reinforcing cage is prefabricated with grouting pipes and guide components evenly, and the grouting pipes and guide components are distributed in a staggered circumference. Multiple sets of side grout outlets are set at intervals along the vertical height of the grouting pipes, and the bottom outlet of the grouting pipe is located 200-300mm below the bottom of the reinforcing cage.

[0007] Guide slides are uniformly fixed to the outer side of the main body of the buoyancy box. The guide slides on the same side are vertically slidably connected to the guide components. Initial conical inserts are uniformly fixed to the top of the buoyancy box, with the small conical end of the initial conical insert facing upward. Second notch slots are uniformly arranged on the outer edge of the buoyancy box.

[0008] Side discharge control components are installed between side discharge outlets at the same height;

[0009] The top of the central frame is uniformly fixed with connecting conical pins, with the small conical end of the connecting conical pin facing upwards, and the connecting holes are uniformly opened in the main body of the central frame.

[0010] The central frame has a telescopic sliding plate that is uniformly and laterally elastically connected inward. The side sealing plate is fixed to the lower outer end of the telescopic sliding plate, and the side sealing plate on the same side is slidably connected to the outside of the side slurry outlet.

[0011] The process of using the technical solution of the present invention is as follows:

[0012] For independent grouting at the bottom of the pile hole, after the steel cage is hoisted into place, the outlet of the grouting pipe at the bottom should extend 200-300mm beyond the bottom of the cage so that it can be directly inserted into the sediment at the bottom of the pile hole.

[0013] During grouting, high-pressure grouting is first performed on the bottom of the pile hole through the grouting pipe. At this time, the buoyancy frame assembly is preset to a high initial position, and its initial conical insert has not yet been engaged with any side grouting control components. Therefore, all side grouting ports are kept closed to ensure that all grout is used to form the pile end enlargement head at the bottom of the pile hole without any lateral loss.

[0014] When the grouting volume at the bottom of the pile hole reaches the design value, the concrete liquid level inside rises synchronously to the preset height. The grout forms a solidified body of a certain volume at the bottom of the pile hole. The rise in liquid level formed by the grouting volume at the bottom of the pile hole provides power for the buoyancy box to float. The buoyancy box is made of hollow engineering plastic, so that the buoyancy it generates is sufficient to overcome the resistance of each set of side grouting control components.

[0015] As the buoyancy frame assembly begins to rise, its initial conical insert at the top first engages with and pushes the lowest (closest to the bottom of the pile hole) set of side grout control components. This set of side grout control components moves upward, causing the side sealing plate to slide away from the side grout outlet, opening the first (and deepest) side grout outlet. Simultaneously, after the side sealing plate slides away from the side grout outlet, its telescopic sliding plate, due to the inward elastic pull, will cause the side sealing plate to retract to a position that fits against the groove surface of the second notch, without interfering with the pushing operation of this set of side grout control components on the subsequent set of side grout control components.

[0016] As the buoyancy frame assembly continues to rise, through this relay-push mechanism of "joining conical inserts - joining holes," all side grout outlets are forcibly and irreversibly opened sequentially from bottom to top. Grout then flows out laterally from the grouting pipe, reinforcing the soil at different depths on the pile side in sections. The design of the second notch ensures that the side sealing plates of the opened side grout control components can be retracted and inserted sequentially without hindering the insertion and pushing of subsequent side grout control components.

[0017] Another object of the present invention is to provide a construction method for a vertical grouting channel structure of a precast pile, comprising the following steps:

[0018] S1. Component prefabrication and assembly: In the factory or processing plant, the grouting pipes and guide components are fixed in a staggered and uniform manner inside the steel cage to form a permanently embedded part; the side grouting control components at each level form a closed connection to the side grouting ports at different heights; the buoyancy frame assembly is mounted on the guide component through the guide slide to form a recyclable functional module, and the buoyancy frame assembly is locked at the preset initial height using the initial fixing component;

[0019] S2. Overall hoisting and positioning: The assembled steel cage is hoisted into the drilled pile hole, ensuring that the bottom outlet of the grouting pipe extends out of the bottom of the steel cage.

[0020] S3. Concrete pouring and buoyancy triggering: Pour the pile body concrete. When the concrete level rises to the initial position of the buoyancy frame assembly, buoyancy releases it and it begins to float. The initial conical insert at the top of the buoyancy frame assembly first inserts and pushes the bottom side discharge control assembly.

[0021] S4. Sequentially open the side grout outlets and inject grout. The buoyancy frame assembly continues to float upward. Through the multi-stage "conical insert-joining hole" interlocking mechanism, the side grout control components at each stage are forced to move upward in sequence, causing the side sealing plate to disengage from the side grout outlet. The telescopic sliding plates at each stage retract elastically, realizing the sequential opening of the grouting port from bottom to top. The grout first flows out from the bottom outlet of the grouting pipe. As grouting proceeds and the pouring liquid level rises, the grout overflows from the side grout outlets at the top of the grouting pipe in sequence, realizing the layered reinforcement of the pile end and the soil on the pile side.

[0022] S5. Recover reusable components. After grouting is completed, use the buoyancy of the grout in the pile hole or auxiliary tools to remove the buoyancy frame assembly that has moved to the top of the pile and all the side grout control components as a whole from the guide member. After cleaning and maintenance, they can be reused for subsequent pile foundations.

[0023] By adopting the above technical solution, the present invention can achieve the following beneficial effects:

[0024] (1) The present invention sets the initial position of the buoyancy frame assembly based on the initial grouting height at the bottom of the pile hole, so that it is separated from the side grouting system formed by the side grouting port during the grouting at the bottom of the pile, thus physically ensuring the exclusivity of the grouting at the bottom of the pile; all the initial grout and pressure can be used to reinforce the bottom of the pile hole without diversion, which completely avoids the problem that the grout may emerge from the weak part of the pile body in advance in the traditional process, ensuring the formation of a solid and reliable pile bottom enlarged head, which is the fundamental way to improve the bearing capacity;

[0025] (2) This invention innovatively transforms the key construction parameter of the grouting volume at the bottom of the pile into a mechanical signal that triggers the grouting stage on the side of the pile through the height of the liquid level rise caused by it, thus realizing seamless and automatic switching between the two stages; it eliminates the dependence on external manual traction and solves the problems of poor synchronization and low reliability in deep hole operations; it is integrated into the steel cage, requiring no additional equipment or complex operations, which significantly simplifies the construction process and reduces safety risks.

[0026] (3) The present invention adopts the sequence of first fully reinforcing the bottom end of the pile, and then reinforcing the pile side grouting layer by layer from bottom to top. This not only conforms to the basic principle of pile foundation load transfer, but also enables the pressure of subsequent pile side grouting to be established on the reinforced pile end area, further compacting the deep soil and improving the pile quality and bearing capacity.

[0027] (4) The present invention decomposes the entire complex grouting process into two sub-processes controlled by simple mechanical principles (liquid surface buoyancy triggers the buoyancy frame assembly, and the buoyancy frame assembly and each group of side grouting control components are plugged in and interlocked). Each sub-process has a single objective and clear logic. This “phased decoupling” design reduces the overall complexity of the system, reduces the number of failure points, and enhances the reliability of the overall operation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a top view of the grouting pipe and guide component of the present invention arranged in the reinforcing cage;

[0031] Figure 3 This is a schematic diagram of the structure of the grouting pipe, guide member, and side grout outlet member of the present invention;

[0032] Figure 4This is a schematic diagram of the buoyancy frame assembly of the present invention;

[0033] Figure 5 This is a schematic diagram showing the arrangement of each group of side-discharge grouting components in the grouting pipe according to the present invention;

[0034] Figure 6 This is a schematic diagram of the side discharge control assembly of the present invention;

[0035] Figure 7 This is a schematic diagram of the telescopic sliding plate part of the present invention;

[0036] Figure 8 This is a schematic diagram showing the interaction between the side discharge control component of the present invention and a set of buoyancy frame components at the bottom;

[0037] Figure 9 This is a schematic diagram of the C-shaped ferrule in the buoyancy frame assembly at different heights in this invention.

[0038] Figure label:

[0039] 1. Pile hole; 2. Reinforcing cage; 3. Grouting pipe; 4. Guide component; 5. Buoyancy frame assembly; 6. Side grouting component; 7. Side grouting control assembly; 401. Guide column; 402. Magnetic bottom limit sleeve; 501. Buoyancy box; 502. First notch groove; 503. Top fixing frame; 504. Guide slide; 505. Skirt cover; 506. Initial conical insert; 507. Second notch groove; 601. Side grouting port; 602. Side sealing plate slide; 701. Central frame; 702. Inner connecting column; 703. Connecting conical insert; 704. Telescopic sliding plate; 705. Vertical plate; 706. Safety clamp; 707. C-shaped clamp; 708. Side sealing plate; 709. Sliding groove; 710. Sliding block; 711. End fixing seat; 712. Tension spring; 713. Connecting insertion hole. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] like Figures 1-9 As shown, a vertical grouting channel structure for a precast pile is provided. Grouting pipes 3 and guide components 4 are precast evenly inside the reinforcing cage 2. The grouting pipes 3 and guide components 4 are distributed in a staggered circumferential pattern. Multiple sets of side grout outlets 601 are spaced along the vertical height of the grouting pipes 3. The bottom outlet of the grouting pipes 3 is located 200-300mm below the bottom of the reinforcing cage 2.

[0043] The buoyancy box 501 has an annular cavity structure filled with foam buoyancy material. Guide slides 504 are uniformly fixed to the outer side of the main body of the buoyancy box 501. The guide slides 504 on the same side are vertically slidably connected to the guide member 4. Initial conical inserts 506 are uniformly fixed to the top of the buoyancy box 501, with the small conical end of the initial conical inserts 506 facing upward. Second notches 507 are uniformly arranged on the outer edge of the buoyancy box 501, and the position of the second notches 507 on the same side is directly opposite to the guide member 4.

[0044] A side discharge control component 7 is provided between the side discharge outlets 601 at the same height;

[0045] The top of the central frame 701 is uniformly fixed with a conical insert 703, and the small conical end of the conical insert 703 faces upward. The connecting holes 713 are uniformly opened in the main body of the central frame 701, and the position of the connecting holes 713 on the same side is directly opposite to the conical insert 703.

[0046] The central frame 701 has a telescopic slide plate 704 that is uniformly and laterally elastically connected inward in the main body. The side sealing plate 708 is fixed to the lower outer end of the telescopic slide plate 704, and the side sealing plate 708 on the same side is slidably connected to the outside of the side slurry outlet 601.

[0047] When the buoyancy frame assembly 5 floats to the surface of the concrete pouring liquid, it pushes each set of side slurry control components 7 from bottom to top to open the side slurry outlets 601 at the same height.

[0048] As the buoyancy frame assembly 5 rises, the initial conical insert 506 can be inserted first into the engagement hole 713 of a set of side discharge control components 7 at the bottom, and through the insertion and engagement of each set of different engagement conical inserts 703 with the engagement hole 713, it forms a subsequent push on each set of side discharge control components 7.

[0049] The second notch 507 on the same side provides space for the side sealing plate 708 to be opened and retracted under the inward elastic pull of the telescopic slide plate 704. After the set of side discharge control components 7 at the bottom is separated from the side discharge port 601, the side sealing plate 708 of the set of side discharge control components 7 fits into the inner groove surface of the second notch 507. The side sealing plates 708 of each set of side discharge control components 7 that are opened subsequently fit in sequence, without interfering with the pushing and cooperating of the set of side discharge control components 7 at the bottom with the other sets of side discharge control components 7.

[0050] Its working principle is as follows:

[0051] Independent grouting at the bottom of pile hole 1: After the steel cage 2 is hoisted into place, its bottom should maintain a clear distance from the bottom of pile hole 1. The outlet of the bottom of the grouting pipe 3 should extend 200-300mm beyond the bottom of the cage to directly penetrate into the sediment at the bottom of pile hole 1, so that the grout sprayed from the outlet of the bottom of the grouting pipe 3 can directly reinforce the bearing layer at the pile end and compact the sediment, forming an "enlarged head".

[0052] During grouting, high-pressure grouting is first performed on the bottom of the pile hole 1 through the grouting pipe 3. At this time, the buoyancy frame assembly 5 is preset to a high initial position, and its initial conical insert 506 has not yet been engaged with any side grouting control assembly 7. Therefore, the side grouting ports 601 are all kept closed to ensure that all the grout is used to form the pile end enlargement head at the bottom of the pile hole 1 without any lateral loss.

[0053] When the grouting volume at the bottom of the pile hole 1 reaches the design value, the concrete liquid level inside rises synchronously to the preset height. The grout forms a solidified body of a certain volume at the bottom of the pile hole 1. The rise in liquid level formed by the grouting volume at the bottom of the pile hole 1 provides power for the upward floating of the buoyancy box 501. Moreover, the buoyancy box 501 is made of hollow engineering plastic, so that the buoyancy it forms is sufficient to overcome the resistance of each set of side grouting control components 7.

[0054] As the buoyancy frame assembly 5 begins to rise, its initial conical insert 506 at the top first engages with and pushes the engagement hole 713 of the lowest (i.e., closest to the bottom of the pile hole 1) set of side grout control components 7. This set of side grout control components 7 moves upward, causing the side sealing plate 708 to slide away from the side grout outlet 601, opening the first (and deepest) side grout outlet 601. At the same time, after the side sealing plate 708 slides away from the side grout outlet 601, its telescopic sliding plate 704, due to the inward elastic pull, will cause the side sealing plate 708 to retract to a position that fits against the inner groove surface of the second notch 507, without interfering with the pushing operation of this set of side grout control components 7 on the subsequent set of side grout control components 7.

[0055] As the buoyancy frame assembly 5 continues to rise, through the relay pushing mechanism of "joining conical insert 703-joining insertion hole 713", all side grout outlets 601 are forcibly and irreversibly opened from bottom to top in sequence; the grout then flows out from the side of the grouting pipe 3, and the soil at different depths on the side of the pile is reinforced in sections; the design of the second notch groove 507 can ensure that the side sealing plate 708 of the opened side grout control assembly 7 can be inserted into it in sequence after being retracted, without hindering the insertion and pushing of the subsequent side grout control assembly 7;

[0056] Furthermore, there is a tiny sliding gap between the side sealing plate 708 and the side sealing plate slide 602, which allows for slight leakage. A small amount of grout leakage will not cause grouting failure.

[0057] When the top side grouting control component 7 is pushed out, all side grouting ports 601 are opened. As the grouting liquid level rises, the buoyancy frame component 5 and all the side grouting control components 7 will be pushed to the top outlet of the pile hole 1. At this time, the buoyancy frame component 5 and the side grouting control components 7 can be taken out and cleaned so that the buoyancy frame component 5 and the side grouting control components 7 can be reused. The grouting pipe 3 and the guide component 4 are retained in the pile hole 1 as permanent components.

[0058] When the buoyancy frame assembly 5 forms an insertion engagement with the engagement hole 713 of any set of side discharge control components 7 through its initial conical insert 506 or the engagement conical insert 703 of the previous stage assembly and pushes it to move, the side discharge port 601 controlled by the pushed side discharge control component 7 is always located below the main body of the buoyancy frame assembly 5 in the vertical direction, so that the buoyancy box 501 that provides the main buoyancy is always above the liquid surface area of ​​the fresh concrete slurry, so as to obtain continuous and stable buoyancy and drive the entire sequential trigger chain;

[0059] Furthermore, as core components that need to be permanently embedded in the concrete of the pile body in the pile hole 1, the grouting pipe 3 and the guide component 4 must meet the core requirements of high strength, corrosion resistance, good bonding with concrete, and reliable function in terms of material and structure. Galvanized seamless steel pipes with Q235 base material are preferred.

[0060] The specific structures of guide member 4 and side discharge member 6 are as follows: Figure 2 , Figure 3 and Figure 5 As shown, the side sealing plate slide 602 is located on the outside of the side grout outlet 601 and is fixedly connected to the outer wall of the grouting pipe 3. The side sealing plate 708 is slidably inserted into the side sealing plate slide 602 and can form a seal on the side grout outlet 601.

[0061] The guide posts 401 are prefabricated evenly inside the steel cage 2, and the magnetic bottom limit sleeve 402 is fixed at the lower end of the guide post 401 at a set height position.

[0062] The guide slide 504 on the same side is slidably connected to the guide column 401. In order to achieve a smooth sliding connection between the guide slide 504 and the guide column 401, the surface of the guide column 401 must be smooth. When the guide column 401 and the steel cage 2 are prefabricated, the main reinforcement of the steel cage 2 must be arranged along the entire length to ensure that the axis of the guide column 401 is parallel to that of the steel cage 2.

[0063] The specific structures of the buoyancy frame assembly 5 and the side discharge control assembly 7 are as follows: Figure 4 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the first notch 502 is also evenly distributed on the outer edge of the buoyancy box 501 to eliminate sliding interference with the guide post 401;

[0064] The top of the buoyancy box 501 is fixedly connected to the top support 503, and the skirt-shaped cover 505 is fixedly connected to the bottom of the buoyancy box 501.

[0065] The buoyancy box 501, the first notch 502, and the second notch 507 together form a unique hollow cavity, which not only maintains the structural rigidity of the buoyancy box 501 as the main body, but also forms the buoyancy generator and space avoidance in the sequential triggering system.

[0066] The skirt-shaped cover 505 has notches at the positions directly opposite to the first notch slot 502 and the second notch slot 507 of each group. One end of the outer edge of the skirt-shaped cover 505 is in close contact with the reinforcing cage 2, the grouting pipe 3 and the guide member 4. This can prevent grout from intruding into the sliding contact area of ​​the guide slide 504 and the guide column 401, providing a relatively clean environment for the contact between the guide slide 504 and the guide column 401. It can also reduce the deflection during the upward floating of the buoyancy frame assembly 5, making it rise more stably and smoothly along the guide member 4.

[0067] During hoisting and transportation, the buoyancy frame assembly 5 is located at the lower limit position, and the bottom of the guide slide 504 is provided with a magnetic block that cooperates with the magnetic bottom limit sleeve 402 to realize the magnetic connection between the buoyancy frame assembly 5 and the magnetic bottom limit sleeve 402. The buoyancy of the slurry at the bottom of the pile hole 1 on the buoyancy box 501 is much greater than the magnetic force between the magnetic bottom limit sleeve 402 and the guide slide 504.

[0068] Furthermore, there is a certain sliding fit clearance between the guide slide 504 and the guide column 401 to minimize the occurrence of jamming. If necessary, a small amount of water-soluble lubricant can be applied to the surface of the guide column 401 before the steel cage 2 is driven into the pile.

[0069] The inner connecting columns 702 are evenly fixed inside the central frame 701. Each set of telescopic sliding plates 704 has a vertical plate 705 fixed to its outer end. The side sealing plate 708 is fixed to the lower end of the vertical plate 705.

[0070] Furthermore, the thickness of the side sealing plate 708 is thinner than that of the vertical plate 705, which allows the side sealing plate 708 to form a certain degree of elasticity, making it easier to form a sliding insertion fit with the side sealing plate slide 602, and to form a stable connection with the telescopic slide plate 704 through the vertical plate 705.

[0071] Each set of side slurry outlets 601 is equipped with a pair of safety locking posts 706 above it. The safety locking posts 706 are fixed to the outer wall. Both ends of the upright plate 705 are fixed with C-shaped sleeves 707. When the side sealing plate 708 is inserted into the side sealing plate slide 602 to close the side slurry outlet 601, the C-shaped sleeves 707 on the same side can be inserted into the safety locking posts 706 to improve the safety of the side sealing plate 708 in the closed state.

[0072] Since the opening of the C-shaped sleeve 707 is located on the lower side, and the clamping force formed by the C-shaped sleeve 707 and the safety pin 706 will not affect the buoyancy frame assembly 5's pushing and disengaging operation of each set of side discharge control components 7 under the action of buoyancy;

[0073] Sliding grooves 709 are evenly distributed in the main body of the central frame 701. Sliding blocks 710 are fixed on both sides of the inner end of each set of telescopic sliding plates 704. The sliding blocks 710 on the same side are slidably connected to the sliding grooves 709. The inner end of the telescopic sliding plate 704 and the outer end of the inner connecting column 702 are both fixed with end seats 711. The two ends of the tension spring 712 are fixed between the two sets of end seats 711 on the same side.

[0074] The tension spring 712 can provide an inward pulling force for the sliding block 710 relative to the sliding groove 709, so that in its natural state, the components consisting of the telescopic slide plate 704, the upright plate 705 and the side sealing plate 708 will retract inward.

[0075] That is, when the side sealing plate 708 is separated from the side sealing plate slide 602, under the action of the tension spring 712, the component consisting of the telescopic slide plate 704, the upright plate 705 and the side sealing plate 708 is driven to retract to one side of the inner groove surface of the second notch groove 507.

[0076] Furthermore, the distance between the paired C-shaped sleeves 707 in each set of side discharge control components 7 arranged from bottom to top decreases sequentially, so that the gap between the paired C-shaped sleeves 707 that first abut against the inner groove surface of the second notch 507 can form a space to accommodate the subsequently abutted side sealing plate 708, vertical plate 705 and C-shaped sleeves 707, thereby forming a safe abutment of the components composed of each set of side sealing plate 708, vertical plate 705 and C-shaped sleeves 707;

[0077] The length of the end mount 711 is set according to the C-shaped ferrule 707 with the longest relative distance, so that it can meet the snap-fit ​​of the C-shaped ferrule 707 at different height positions;

[0078] Furthermore, the accommodating space formed by the second notch 507 will not interfere with the end fixing seat 711, and also allows for the stacking of the components consisting of each set of side sealing plates 708, upright plates 705 and C-shaped sleeves 707.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical grouting channel structure of a pile body of a precast pile, comprising a reinforcement cage (2), characterized in that: It also includes a grouting pipe (3), a guide component (4), a buoyancy frame assembly (5), a side grouting component (6), and a side grouting control assembly (7). The buoyancy frame assembly (5) includes a buoyancy box (501) and a second notch (507). The side grouting component (6) includes a side grouting port (601). The reinforcing cage (2) is prefabricated with grouting pipes (3) and guide components (4). Multiple sets of side grouting ports (601) are spaced apart along the vertical height of the grouting pipes (3). Guide slides (504) are uniformly fixed to the outer side of the main body of the buoyancy box (501). The guide slides (504) on the same side are vertically slidably connected to the guide components (4). The top of the buoyancy box (501) is uniformly fixed with an initial conical insert (506). The second notch (507) is uniformly arranged on the outer edge of the buoyancy box (501). Side grouting control components (7) are provided between the side grouting ports (601) at the same height. The side discharge control assembly (7) includes a central frame (701), a side sealing plate (708), and a connecting hole (713). The top of the central frame (701) is uniformly fixed with a connecting conical plug (703). The connecting hole (713) is uniformly opened in the body of the central frame (701). The telescopic slide plate (704) is uniformly and elastically slidably connected inward in the body of the central frame (701). The side sealing plate (708) is fixed to the lower outer end of the telescopic slide plate (704), and the side sealing plate (708) on the same side is slidably connected to the outside of the side discharge port (601).

2. The vertical grouting channel structure for a precast pile according to claim 1, characterized in that: The bottom outlet of the grouting pipe (3) is located 200-300mm below the bottom of the reinforcing cage (2).

3. The vertical grouting channel structure for a precast pile according to claim 2, characterized in that: The guide component (4) includes a guide post (401) and a magnetic bottom sleeve (402). The guide post (401) is prefabricated evenly in the steel cage (2). The magnetic bottom sleeve (402) is fixed to the lower end of the guide post (401). The guide slide (504) on the same side is slidably connected to the guide post (401).

4. The vertical grouting channel structure for a precast pile according to claim 1, 2, or 3, characterized in that: The buoyancy frame assembly (5) also includes a first notch (502), a top fixing frame (503), and a skirt cover (505). The first notch (502) is evenly distributed on the outer edge of the buoyancy box (501). The top of the buoyancy box (501) is fixed to the top fixing frame (503), and the skirt cover (505) is fixed to the bottom of the buoyancy box (501).

5. The vertical grouting channel structure for a precast pile according to claim 1, 2, or 3, characterized in that: The buoyancy box (501) is an annular cavity structure filled with foam buoyancy material.

6. The vertical grouting channel structure for a precast pile according to claim 1, 2, or 3, characterized in that: The side grouting component (6) also includes a side sealing plate slide (602), which is located outside the side grouting port (601) and is fixed to the outer wall of the grouting pipe (3). The side sealing plate (708) is slidably inserted into the side sealing plate slide (602).

7. The vertical grouting channel structure for a precast pile according to claim 1, 2, or 3, characterized in that: The side discharge control assembly (7) also includes an inner connecting column (702), a sliding groove (709) and a tension spring (712). The inner connecting column (702) is uniformly fixed inside the central frame (701). Each set of telescopic slide plates (704) has a vertical plate (705) fixed to its outer end. The side sealing plate (708) is fixed to the lower end of the vertical plate (705). The sliding groove (709) is uniformly opened in the main body of the central frame (701). Each set of telescopic slide plates (704) has a sliding block (710) fixed on both sides of its inner end. The sliding block (710) on the same side is slidably connected to the sliding groove (709). The inner end of the telescopic slide plate (704) and the outer end of the inner connecting column (702) are both fixed with end seats (711). The two ends of the tension spring (712) are fixed between the end seats (711) on the same side.

8. The vertical grouting channel structure for a precast pile according to claim 7, characterized in that: Each set of side grout outlets (601) is equipped with a pair of safety posts (706) above it. The safety posts (706) are fixed to the outer wall of the grouting pipe (3). Both ends of the vertical plate (705) are fixed with C-shaped sleeves (707).

9. A construction method for a vertical grouting channel structure for a precast pile as described in claim 1, characterized in that, Includes the following steps: S1. Component prefabrication and assembly: In the factory or processing site, the grouting pipe (3) and the guide component (4) are fixed in a staggered and uniform manner inside the steel cage (2) to form a permanent embedded part; the side grouting control components (7) at each level form a closed connection with the side grouting ports (601) at different heights; the buoyancy frame assembly (5) is fitted onto the guide component (4) through the guide slide (504) to form a recyclable functional module, and the buoyancy frame assembly (5) is locked at the preset initial height using the initial fixing component; S2. Overall hoisting and positioning: The assembled steel cage (2) is hoisted into the drilled pile hole (1) to ensure that the bottom outlet of the grouting pipe (3) extends out of the bottom of the steel cage (2); S3. Concrete pouring and buoyancy triggering: Pour the pile body concrete. When the concrete liquid level rises to the initial position of the buoyancy frame assembly (5), the buoyancy unlocks it and it begins to float. The initial conical insert (506) at the top of the buoyancy frame assembly (5) is first inserted and pushes the bottom side grout control assembly (7). S4. Sequentially open the side grout outlets and grouting, the buoyancy frame assembly (5) continues to float upwards, and through the multi-level "conical insert-joining hole" chain push mechanism, force each level of side grout control assembly (7) to move upwards in sequence, driving the side sealing plate (708) to disengage from the side grout outlet (601), and each level of telescopic sliding plate (704) elastically retracts, realizing the sequential opening of the grouting port from bottom to top. The grout first flows out from the bottom outlet of the grouting pipe (3). As grouting proceeds and the pouring liquid level rises, the grout overflows from each side grout outlet (601) at the top of the grouting pipe (3) in sequence, realizing the layered reinforcement of the pile end and the soil on the pile side; S5. Recycle reusable components. After grouting is completed, use the buoyancy of the grout in the pile hole or auxiliary tools to remove the buoyancy frame assembly (5) that has moved to the top of the pile and all the side grout control components (7) as a whole from the guide member (4), clean and maintain them for reuse in subsequent pile foundations.

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