Curing pile structure capable of being grouted and construction method thereof

Abstract

The invention provides a grouting curing pile structure and a construction method thereof, the grouting curing pile structure comprises a pile body and an injection mechanism, the pile body comprises a pile body, a plastic-coated steel pipe is arranged in the pile body in the circumferential direction, the injection mechanism comprises an injection pipe, the injection pipe can extend into the plastic-coated steel pipe, an injection port is formed in the injection pipe, and the injection port can communicate with the plastic-coated steel pipe; a plurality of injection ports are formed in the surface of the pile body in the circumferential direction and the longitudinal direction, and three-way valves are arranged at the positions, corresponding to the injection ports, in the pile body; a liquid drainage assembly is arranged in a branch pipe of the three-way valve and comprises a first one-way valve and a protective film, and the protective film is arranged at the outlet end, close to the injection port, of the three-way valve and located in the pile body; the first one-way valve comprises a puncturing structure, the puncturing structure faces the protective film, and the puncturing structure can puncture the protective film. The puncturing structure is driven by the grouting pressure to break the protective film, an additional driving mechanism does not need to be added, and the grouting pressure can be used for grouting and breaking the protective film.

Description

Technical Field

[0001] This invention relates to the field of solidified pile technology, specifically to a groutable solidified pile structure and its construction method. Background Technology

[0002] Solidified piles include high-pressure jet grouting piles, in-situ silt solidification piles, and ecological solidification piles. With the development of high-rise buildings and increasingly stringent environmental protection requirements, ecological solidification piles offer significant advantages in terms of environmental protection, but their solidification time is relatively long and their solidification strength is limited. Grouting after drilling and grouting can improve their strength.

[0003] Post-grouting of bored piles refers to a construction technique where, after the bored pile is formed and the concrete reaches its predetermined strength, cement grout, MICP aqueous solution, or similar liquids are injected through pre-embedded grouting pipes using a high-pressure grouting pump. This technique allows the grout to penetrate into the loose surrounding soil, bonding to form high-strength concrete. As the grout volume increases, the cement grout continuously penetrates into the bearing stratum at the pile tip, which has softened due to mud soaking, increasing the bearing area at the pile tip, improving the connection between the pile and the soil, and enhancing the bearing capacity of the surrounding soil.

[0004] However, the channels through which existing ecological solidification piles inject liquid consolidation materials into the soil layer are easily blocked by soil silt, which prevents grouting from proceeding smoothly and thus affects the solidification strength of the solidification pile. Summary of the Invention

[0005] The primary objective of this invention is to provide a groutable solidified pile structure to address the problem that existing injection fluid channels are easily blocked by soil silt.

[0006] A second objective of this invention is to provide a construction method for a groutable solidified pile structure, which utilizes the aforementioned groutable solidified pile structure.

[0007] To achieve the first objective of this invention, the present invention provides a groutable solidified pile structure, comprising a pile body and an injection mechanism. The pile body includes a pile shaft, within which a plastic-coated steel pipe extending axially is arranged circumferentially. The injection mechanism includes an injection pipe that extends into the plastic-coated steel pipe and has an injection port that communicates with the plastic-coated steel pipe. Several injection ports are arranged circumferentially and longitudinally on the surface of the pile shaft. A three-way valve is provided at a position corresponding to each injection port within the pile shaft, and the three-way valve communicates with the plastic-coated steel pipe. A drainage assembly is provided within a branch of the three-way valve. The drainage assembly includes a first one-way valve and a protective membrane. The protective membrane is located at the outlet end of the three-way valve near the injection port and is situated within the pile shaft. The first one-way valve includes a puncture structure facing the protective membrane and capable of puncturing the protective membrane.

[0008] As can be seen from the above scheme, the plastic-coated steel pipe can not only be used for injecting solutions, but also serve as a reinforcing bar and sonic logging pipe, improving the structural strength of the pile and facilitating pile integrity testing, achieving three benefits in one go. The plastic-coated steel pipe is connected to the three-way valve. The branch pipe not used by the three-way valve is equipped with a first one-way valve that allows liquid to flow out, which can effectively prevent substances in the soil from entering the plastic-coated steel pipe. The outside of the first one-way valve is equipped with a disposable protective film, which can prevent the first one-way valve from being contaminated by liquid or solid particles in the soil during pile driving, further preventing liquid from the soil from entering the first one-way valve and improving the working reliability of the first one-way valve. When liquid flows into the three-way valve, the puncture structure moves outward to puncture the protective film, thereby realizing the drainage. The structure is simple and the drainage reliability is high.

[0009] A further embodiment includes an elastic element, a positioning post, a first positioning ring, and a second positioning ring. The first and second positioning rings are respectively disposed at both ends of the positioning post. A first one-way valve and the elastic element are disposed inside the positioning post. The first one-way valve also includes a valve core, and the outer diameter of the valve core matches the inner diameter of the positioning post. One side of the valve core abuts against the first positioning ring, and the other side of the valve core is provided with a puncture structure. One end of the elastic element is fixed to the side of the valve core with the puncture structure, and the other end of the elastic element abuts against the second positioning ring. A protective film is disposed on the side of the second positioning ring away from the elastic element, and the protective film completely covers the second positioning ring.

[0010] A further option is to fix the positioning pin, the first positioning ring, and the second positioning ring inside the branch pipe of the three-way valve by interference fit or bonding, and fix the protective film to the second positioning ring by welding or bonding.

[0011] As can be seen from the above scheme, the setting of the elastic element ensures the stability of the one-way drainage of the first one-way valve.

[0012] A further proposed solution is to use a cross-shaped cone structure for the puncture, with the cone tip facing the protective film.

[0013] As can be seen from the above scheme, the cross-shaped structure makes it easy to puncture the protective membrane and ensure the implementation of drainage.

[0014] A further proposed solution is to install a protective net on the side of the protective membrane away from the puncture structure, with the outer diameter of the net matching the inner diameter of the injection port, and the net located inside the pile body.

[0015] As can be seen from the above scheme, the protective membrane was torn by foreign objects in the soil during the installation and pressing process of the protective net.

[0016] A further option is to install a second one-way valve at the tail end of the injection tube, with the injection port located on the peripheral wall at the tail end of the injection tube.

[0017] As can be seen from the above scheme, the second check valve is used to relieve the gas / liquid pressure when the injection tube descends. The injection inlet is located at the end of the injection tube to connect all injection ports.

[0018] A further embodiment includes a lifting point, an inlet, and a dispensing chamber in the injection mechanism. The dispensing chamber is connected to both the inlet and the injection tube. There is at least one injection tube. The lifting point is located on the inlet.

[0019] As can be seen from the above scheme, by controlling the lifting and lowering of the injection tube through the suspension point, the injection port is aligned with the first one-way valve. The solution can be forced into the aligned first one-way valve and the injection port, thereby achieving directional injection of solution into the injection port at a specific depth. This allows control of the injection volume at the injection port at a specific depth, ensuring the uniformity of solution injection.

[0020] A further embodiment includes a pile body comprising multiple first annular reinforcing bars, multiple longitudinal reinforcing bars, and multiple reinforcing plates. The multiple first annular reinforcing bars and multiple reinforcing plates are arranged longitudinally. The longitudinal reinforcing bars and plastic-coated steel pipes are arranged in parallel. The plastic-coated steel pipes are arranged inside the first annular reinforcing bars and abut against the first annular reinforcing bars. The plastic-coated steel pipes are located outside the reinforcing plates and abut against the reinforcing plates. The reinforcing plates are formed by connecting multiple coaxially arranged second annular reinforcing bars and multiple radial reinforcing bars.

[0021] A further proposed solution is to have multiple coaxially arranged second annular reinforcing bars symmetrically positioned above and below multiple radial reinforcing bars in each reinforcing slab.

[0022] As can be seen from the above scheme, the strength of the pile structure itself is ensured by constructing the pile body with steel bars.

[0023] A further proposed solution is to install a composite pile core between every two reinforcing steel plates.

[0024] As can be seen from the above scheme, the composite pile core enhances the pile's resistance to compression, tension, and bending, extends the pile's service life, and provides greater structural stability.

[0025] A further proposed solution is to connect a pile tip to the bottom of the pile body and a pile cap to the top of the pile body, with a through hole on the pile cap, which corresponds to the plastic-coated steel pipe.

[0026] To achieve the second objective of this invention, this invention provides a construction method for a groutable solidified pile structure. This construction method utilizes a groutable solidified pile structure as described in any of the above-mentioned schemes. The construction method includes the following steps: S1: Pre-pressing the pile body to a set depth; S2: Inserting the injection pipe of the injection mechanism into the plastic-coated steel pipe, so that the injection port is opposite to the branch pipe of the lowest three-way valve; S3: Injecting solution into the injection pipe. As the pressure of the injected solution increases, the puncture structure moves and punctures the protective membrane, and the solution is discharged outward; S4: When the solution discharge at the lowest three-way valve reaches a predetermined amount, the injection mechanism is moved upward so that the injection port is opposite to the branch pipe of another three-way valve; S5: Repeating steps S3 and S4 until the solution discharge at all three-way valves reaches the predetermined amount, then pulling out the injection pipe to complete the construction.

[0027] As can be seen from the above scheme, injecting a solution into the silt layer surrounding the pile via an injection mechanism solidifies the silt layer, further improving the bearing capacity of the solidified pile. Furthermore, the construction method is simple and efficient, with good drainage stability and is not easily clogged. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the groutable solidified pile structure of the present invention.

[0029] Figure 2 This is a cross-sectional view of the groutable solidified pile structure of the present invention.

[0030] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0031] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0032] Figure 5 yes Figure 2 A magnified view of point C in the middle.

[0033] Figure 6 This is an exploded view of the drainage component.

[0034] Figure 7 This is a structural diagram of a steel frame.

[0035] Figure 8 This is a schematic diagram of the injection mechanism.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0037] join Figures 1 to 8 The groutable solidified pile structure provided in this embodiment includes a pile body and an injection mechanism 7.

[0038] See Figures 1 to 6 The pile body includes a pile cap 1, a pile body 2, a pile tip 3, a composite pile core 4, a steel reinforcement frame, a plastic-coated steel pipe 6, and a drainage assembly.

[0039] The pile body 2 is formed of concrete, and several injection ports 21 are provided on the surface of the pile body 2 along the circumferential and longitudinal directions. A plastic-coated steel pipe 6 extending axially is provided in the pile body 2 along the circumferential direction. The bottom of the pile body 2 is connected to the pile tip 3, and the top of the pile body 2 is connected to the pile cap 1. The pile cap 1 is provided with a through hole (not shown in the figure), and the through hole is provided corresponding to the plastic-coated steel pipe 6.

[0040] A three-way valve 61 is installed inside the pile body 2 at a position corresponding to each injection port 21. The three-way valve 61 is connected to the plastic-coated steel pipe 6. Specifically, the two outlets of the three-way valve 61 are connected to the plastic-coated steel pipe 6 in a straight line. The remaining branch pipe of the three-way valve 61 that is not connected to the plastic-coated steel pipe 6 is connected to the injection port 21. The outer diameter of the branch pipe of the three-way valve 61 matches the inner diameter of the injection port 21.

[0041] A drainage assembly is installed inside the branch pipe of the three-way valve 61. The drainage assembly includes a first one-way valve 62, a protective membrane 64, an elastic element 63, a protective mesh 65, a positioning post 66, a first positioning ring 671, and a second positioning ring 672. The first one-way valve 62 includes a valve core 621 and a puncture structure 622. The first positioning ring 671 and the second positioning ring 672 are respectively located at both ends of the positioning post 66, and the first one-way valve 62 and the elastic element 63 are located inside the positioning post 66. The second positioning ring 672 is closer to the outlet of the injection port 21 than the first positioning ring 671.

[0042] The outer diameter of the valve core 621 matches the inner diameter of the positioning post 66. One side of the valve core 621 abuts against the first positioning ring 671, and the other side of the valve core 621 is provided with a piercing structure 622. One end of the elastic element 63 is fixed to the side of the valve core 621 with the piercing structure 622, and the other end of the elastic element 63 abuts against the second positioning ring 672. A protective film 64 is disposed on the side of the second positioning ring 672 away from the elastic element 63, and the protective film 64 completely covers the second positioning ring 672. When the protective film 64 is not pierced, the injection port 21 is also in a sealed state. The protective film 64 is located inside the post body 2 and is not exposed outside the injection port 21. The piercing structure 622 can pierce the protective film 64. In this embodiment, the piercing structure 622 is a cross-shaped cone structure, with the cone tip facing the protective film 64. The cross-shaped cone structure facilitates piercing the protective film 64, ensuring the implementation of drainage.

[0043] The positioning pin 66, the first positioning ring 671, and the second positioning ring 672 are fixed inside the branch pipe of the three-way valve 61 by interference fit or bonding, and the protective film 64 is fixed to the second positioning ring 672 by welding or bonding.

[0044] A protective mesh 65 is also provided on the side of the protective membrane 64 away from the puncture structure 622. The outer diameter of the protective mesh 65 matches the inner diameter of the injection port 21, and the protective mesh 65 is located inside the pile body 2. The protective mesh 65 can be fixed inside the injection port 21 by interference fit or adhesive bonding.

[0045] See Figure 2 and Figure 7 The pile body also includes multiple first annular reinforcing bars 51, multiple longitudinal reinforcing bars 52, and multiple reinforcing plates 53. The multiple first annular reinforcing bars 51 and multiple reinforcing plates 53 are arranged longitudinally, which is the axial direction of the pile body 2. The longitudinal reinforcing bars 52 and the plastic-coated steel pipes 6 are arranged parallel to each other. The plastic-coated steel pipes 6 are placed inside the first annular reinforcing bars 51 and abut against the first annular reinforcing bars 51, and are located outside the reinforcing plates 53 and abut against the reinforcing plates 53. The reinforcing plates 53 are formed by connecting multiple coaxially arranged second annular reinforcing bars 531 and multiple radial reinforcing bars 532. In each reinforcing plate 53, the multiple coaxially arranged second annular reinforcing bars 531 are symmetrically arranged above and below the multiple radial reinforcing bars 532. The multiple first annular reinforcing bars 51, multiple longitudinal reinforcing bars 52, and multiple reinforcing plates 53 together form the reinforcing frame of the pile body. The pile body structure is built by reinforcing bars to ensure the strength of the pile body itself. A composite pile core 4 is provided between every two reinforcing plates 63. The composite pile core 4 is a composite pile core prepared using materials and processes well known to those skilled in the art. The composite pile core 4 enhances the pile's resistance to compression, tension, and bending, extends its service life, and provides greater structural stability.

[0046] See Figures 1 to 3 and Figure 8 The injection mechanism 7 includes a lifting point 71, an inlet 72, a distribution chamber 73, an injection tube 74, an injection port 75, and a second one-way valve 76. The distribution chamber 73 is connected to both the inlet 72 and the injection tube 74, and the lifting point 71 is located on the inlet 72. There is at least one injection tube 74; in this embodiment, there are three injection tubes 74, corresponding to the number of plastic-coated steel tubes 6. All three injection tubes 74 can simultaneously extend into the three plastic-coated steel tubes 6. Each injection tube 74 has an injection port 75, which can communicate with the plastic-coated steel tube 6. A second one-way valve 76 is located at the tail end of each injection tube 74. The second one-way valve 76 only allows gas and liquid to flow into the injection tube 74 from bottom to top, and prohibits liquid from flowing into the plastic-coated steel tube 6 from top to bottom. The second one-way valve 76 is used to relieve the gas / liquid pressure when the injection tube 74 descends, facilitating the insertion of the injection tube 74 into the plastic-coated steel tube 6. When the injection tube 74 extends to its deepest point into the plastic-coated steel tube 6, a blind hole 68 is formed between the bottom of the plastic-coated steel tube 6 and the bottom of the injection tube 74 (i.e., the bottom of the second one-way valve 76). Preferably, in this embodiment, the injection port 75 is located on the peripheral wall of the tail end of the injection tube 74. The injection port 75 being located at the tail end of the injection tube 74 allows for communication with all injection ports 21.

[0047] In this embodiment, the plastic-coated steel pipe 6 is not only used for injecting solutions, but also serves as a reinforcing bar and a sonic logging pipe, improving the structural strength of the pile and facilitating pile integrity testing—achieving three benefits in one. The plastic-coated steel pipe 6 is connected to a three-way valve 61. A first one-way valve 62, allowing liquid to flow out, is installed in the branch pipe of the three-way valve 61 that is not connected to the plastic-coated steel pipe 6. This effectively prevents substances in the soil from entering the plastic-coated steel pipe 6. A disposable protective membrane 64 is provided on the outside of the first one-way valve 62. This protective membrane 64 prevents the first one-way valve 62 from being contaminated by liquids or solid particles in the soil during pile driving, further preventing liquids from the soil from entering the first one-way valve 62 and improving its operational reliability. When liquid flows into the three-way valve 61, the puncture structure 622 moves outward to puncture the protective membrane 64, thereby achieving drainage. The structure is simple, and the drainage reliability is high. The elastic element 63 ensures the stability of the one-way drainage of the first one-way valve 62. The protective mesh 65 is installed to protect the protective membrane 64 from being torn by foreign objects in the soil during the pressing process. The injection mechanism 7 controls the raising and lowering of the injection pipe through the lifting point 71, aligning the injection port 75 with the first one-way valve 62. The solution can be forced into the aligned first one-way valve 62 and injection port 21, thereby achieving directional injection of solution into the injection port 21 at a specific depth. This allows control over the injection volume at the injection port 21 at a specific depth, ensuring the uniformity of solution injection. The protective membrane 64 and the protective mesh 65 are located inside the pile body 2, not exposed on the outside of the pile body 2, and are not easily damaged by the soil.

[0048] The construction method for the groutable solidified pile structure provided in this embodiment utilizes the aforementioned groutable solidified pile structure and includes the following steps: S1: Preload pile 2 to the set depth; S2: The injection tube 74 of the injection mechanism 7 extends into the plastic-coated steel tube 6, so that the injection port 75 is opposite to the branch of the three-way valve 61 at the lowest point; S3: Inject solution into injection tube 74. As the injection solution pressure increases, the puncture structure 622 moves to puncture the protective membrane 64, and the solution is discharged outward. S4: When the solution discharge at the lowest three-way valve 61 reaches the predetermined amount, the injection mechanism 7 is moved upward by the lifting point 71 so that the injection port 75 is opposite to the branch pipe of another three-way valve 61 adjacent to the lowest three-way valve 61. S5: Repeat steps S3 and S4 until the solution discharge from all three-way valves 61 reaches the predetermined amount. Then, use the lifting point 71 to pull out the injection pipe 74 to complete the construction.

[0049] In this embodiment, the injected solution is an aqueous solution of microbial induced calcium carbonate precipitation (MICP), which solidifies the silt layer around the pile and further improves the bearing capacity of the ecologically solidified pile.

[0050] This construction method utilizes grouting pressure to drive the piercing structure 622 to break the protective membrane 64, eliminating the need for additional driving mechanisms. The grouting pressure can both inject grout and break the protective membrane 64, achieving two goals at once.

[0051] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included within the scope of the present invention patent application.

Claims

1. A groutable solidified pile structure, characterized in that: The device includes a pile body and an injection mechanism. The pile body includes a pile shaft, in which a plastic-coated steel pipe extending axially is arranged along the circumferential direction. The injection mechanism includes an injection pipe that can extend into the plastic-coated steel pipe and has an injection port that can communicate with the plastic-coated steel pipe. The surface of the pile body is provided with a number of injection ports along the circumferential and longitudinal directions. A three-way valve is provided inside the pile body at a position corresponding to each of the injection ports. The three-way valve is connected to the plastic-coated steel pipe. The three-way valve has a drainage assembly inside its branch pipe. The drainage assembly includes a first one-way valve and a protective membrane. The protective membrane is located at the outlet end of the three-way valve near the injection port and is located inside the pile body. The first one-way valve includes a puncture structure facing the protective membrane and is capable of puncturing the protective membrane.

2. The groutable solidified pile structure as described in claim 1, characterized in that: The drainage assembly further includes an elastic element, a positioning post, a first positioning ring, and a second positioning ring. The first positioning ring and the second positioning ring are respectively disposed at both ends of the positioning post, and the first one-way valve and the elastic element are disposed inside the positioning post. The first one-way valve further includes a valve core, and the outer diameter of the valve core matches the inner diameter of the positioning post. One side of the valve core abuts against the first positioning ring, and the other side of the valve core is provided with the puncture structure. One end of the elastic element is fixed to the side of the valve core provided with the puncture structure, and the other end of the elastic element abuts against the second positioning ring. The protective film is disposed on the side of the second positioning ring away from the elastic element, and the protective film completely covers the second positioning ring.

3. The groutable solidified pile structure as described in claim 1, characterized in that: The puncture structure is a cross-shaped cone structure, with the cone tip facing the protective film.

4. The groutable solidified pile structure as described in claim 1, characterized in that: A protective mesh is also provided on the side of the protective membrane away from the puncture structure. The outer diameter of the protective mesh matches the inner diameter of the injection port, and the protective mesh is located inside the pile body.

5. The groutable solidified pile structure as described in claim 1, characterized in that: A second one-way valve is provided at the tail end of the injection tube, and the injection port is located on the peripheral wall of the tail end of the injection tube.

6. The groutable solidified pile structure as described in claim 1, characterized in that: The injection mechanism further includes a lifting point, an inlet, and a dispensing cavity. The dispensing cavity is connected to the inlet and the injection tube, respectively. There is at least one injection tube. The lifting point is located on the inlet.

7. A groutable solidified pile structure as described in any one of claims 1 to 6, characterized in that: The pile body also includes a plurality of first annular reinforcing bars, a plurality of longitudinal reinforcing bars, and a plurality of reinforcing plates, wherein the plurality of first annular reinforcing bars and the plurality of reinforcing plates are arranged longitudinally; The longitudinal reinforcing bars and the plastic-coated steel pipe are arranged in parallel. The plastic-coated steel pipe is located inside the first annular reinforcing bar and abuts against the first annular reinforcing bar. The plastic-coated steel pipe is located outside the reinforcing bar plate and abuts against the reinforcing bar plate. The reinforcing steel plate is formed by connecting multiple coaxially arranged second annular reinforcing bars and multiple radial reinforcing bars.

8. The groutable solidified pile structure as described in claim 7, characterized in that: A composite pile core is provided between every two of the aforementioned steel reinforcement plates.

9. A groutable solidified pile structure as described in any one of claims 1 to 6, characterized in that: The bottom of the pile body is connected to a pile tip, and the top of the pile body is connected to a pile cap. The pile cap is provided with a through hole, which is corresponding to the plastic-coated steel pipe.

10. A construction method for a groutable solidified pile structure, characterized in that, This construction method utilizes a groutable solidified pile structure as described in any one of claims 1 to 9, and includes the following steps: S1: Preload the pile to the set depth; S2: The injection tube of the injection mechanism extends into the plastic-coated steel tube, so that the injection port is opposite to the branch pipe of the three-way valve at the lowest point; S3: Inject the solution into the injection tube. As the pressure of the injected solution increases, the puncture structure moves and punctures the protective membrane, and the solution is discharged outward. S4: When the solution discharge from the three-way valve at the lowest point reaches the predetermined amount, the injection mechanism is moved upward so that the injection port is opposite to the branch pipe of the other three-way valve. S5: Repeat steps S3 and S4 until the solution discharge from all the three-way valves reaches the predetermined amount, then pull out the injection tube to complete the construction.

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