Steel pipe bio-solidified soil pile construction system and construction method

Abstract

The application relates to a steel pipe biological solidified soil pile construction system and a construction method. The application is suitable for the technical field of soft soil reinforcement in geotechnical engineering. The application aims to provide a steel pipe biological solidified soil pile construction system and a construction method. The application adopts the technical scheme that the steel pipe biological solidified soil pile construction system is characterized in that the system comprises a steel pipe structure which is provided with a thin-wall steel pipe, at least two steel flower pipes are uniformly distributed on the inner wall of the thin-wall steel pipe, a first inlet and outlet are arranged at the upper end of the steel flower pipe, a plurality of second inlets and outlets are uniformly distributed on the side surface of the steel flower pipe, and the steel flower pipe is provided with a communication channel which is in communication with the first and second inlets and outlets. A grouting machine can be in communication with the first inlets and outlets of the at least two steel flower pipes through a pressure-resistant hose in a second working condition, and can provide biological reinforcement slurry for soft soil in the thin-wall steel pipe through the second inlets and outlets of the steel flower pipe.

Description

Technical Field

[0001] This invention relates to a steel pipe bio-stabilized soil pile construction system and method. It is applicable to the field of soft soil reinforcement technology in geotechnical engineering. Background Technology

[0002] Pile foundations are an important technology for treating soft soil foundations and are currently widely used in various fields of engineering construction. Steel pipe piles, as a commonly used type of pile foundation, have the characteristics of simple construction, high construction efficiency, and good construction quality. They are widely used in water conservancy projects, bridge projects, slope protection projects, and marine cofferdam projects, and are particularly suitable for soft soil areas, marine environments, and river conditions.

[0003] Based on the characteristics of engineering projects and their load-bearing properties, various pile types, such as concrete-filled steel tube piles, have gradually emerged and been applied in actual engineering projects. Due to the lateral restraint of the steel tube, the concrete inside the steel tube is under triaxial compression, which significantly improves the stiffness and bearing capacity of the concrete-filled steel tube pile. However, concrete-filled steel tube piles require additional concrete, and depending on the pile-forming process, they may cause soil squeezing effects or increase the need for transporting and storing soft soil.

[0004] In-situ soil consolidation technology not only solves the problem of resource utilization of soft soil, but also solves the problem of its storage. Microbial consolidation technology, as a new type of green and environmentally friendly soil reinforcement technology, mainly uses urease-producing microorganisms to decompose urea, produce carbonate ions, and combine with calcium ions in the reaction solution to form calcium carbonate deposits, which fill the pores between particles, form a dense soil structure, and thus enhance the mechanical properties of the soil.

[0005] Patent applications 201910666523.2, 202210034480.8, and 202211592574.3 have explored the use of this solidification technology to create ring-shaped bamboo-like reinforcing ribs around the pile and microbial high-pressure jet grouting piles, thereby achieving the purpose of reinforcing soft soil foundations. However, the microbial in-situ solidification technology is greatly affected by soil characteristics and groundwater; the uniformity of reinforcement and the overflow of the biological reinforcement grout are also important factors affecting its reinforcement effect. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a steel pipe bio-cured soil pile construction system and construction method to address the above-mentioned problems.

[0007] The technical solution adopted in this invention is: a steel pipe bio-cured soil pile construction system, characterized in that it comprises:

[0008] The steel pipe structure has a thin-walled steel pipe with at least two steel perforated pipes evenly distributed on the inner wall of the thin-walled steel pipe. The upper end of the steel perforated pipe is provided with a first inlet and outlet, and several second inlets and outlets are evenly distributed on the side of the steel perforated pipe. The steel perforated pipe has a connecting channel connecting the first and second inlets and outlets.

[0009] The grouting machine, under the second working condition, can be connected to the first inlet and outlet of at least two steel pipes via a pressure-resistant hose, and can provide bio-reinforced grout to the soft soil inside the thin-walled steel pipe via the second inlet and outlet of the steel pipe.

[0010] Also includes:

[0011] The vacuum pump, under the second operating condition, is connected to the first inlet and outlet of at least two of the steel pipes via a pressure-resistant hose, and can provide negative pressure to the soft soil inside the thin-walled steel pipes via the second inlet and outlet of the steel pipes.

[0012] The steel pipes connected to the grouting machine and the steel pipes connected to the vacuum pump are arranged symmetrically about the axis of the thin-walled steel pipe.

[0013] Also includes:

[0014] The air compressor is capable of being connected to the first inlet and outlet of at least two steel pipes via a pressure-resistant hose under the first operating condition, and can provide high-pressure gas to the soft soil inside the thin-walled steel pipe via the second inlet and outlet of the steel pipe.

[0015] The lower end of the thin-walled steel pipe is connected to an open pile tip; several trapezoidal steel plates are uniformly welded to the outer side of the open pile tip.

[0016] In the second operating condition, the thin-walled steel pipe is equipped with a cap at the top that can close the opening at the top of the thin-walled steel pipe.

[0017] The cap has a round steel sleeve with an inner diameter that matches the outer diameter of the thin-walled steel pipe, and a top steel plate that closes the opening at the upper end of the round steel sleeve. The top steel plate has a through hole that matches the upper end of the steel pipe. The inner wall of the round steel sleeve is provided with a first sealing ring. The through hole of the cap is provided with a second sealing ring.

[0018] The steel perforated pipe has a trapezoidal cross-section, and a steel blade is welded to the bottom of the steel perforated pipe.

[0019] The diameter of the second inlet / outlet is 10-15 mm, and the distance between the second inlet / outlet is 50-100 mm.

[0020] A method for constructing steel pipe bio-stabilized soil piles, characterized by comprising:

[0021] Entering the first working condition, the steel pipe structure is driven into the pile. During the sinking process of the steel pipe structure, the air compressor provides high-pressure gas to the soft soil inside the thin-walled steel pipe through the pressure-resistant hose and the second inlet and outlet of the steel flower pipe on the steel pipe structure.

[0022] After the pile driving is completed, the second working condition is entered, which involves biological solidification of the soft soil inside the steel pipe structure. The grouting machine provides biological solidification grout to the soft soil inside the thin-walled steel pipe through the pressure-resistant hose and the second inlet and outlet of the steel perforated pipe on the upper part of the steel pipe structure. The vacuum pump provides negative pressure to the soft soil inside the thin-walled steel pipe through the pressure-resistant hose and the second inlet and outlet of the remaining steel perforated pipe on the steel pipe structure.

[0023] The beneficial effects of this invention are: by using a grouting machine in conjunction with a steel perforated pipe on the inner wall of a thin-walled steel pipe, the invention utilizes the second inlet and outlet evenly distributed on the steel perforated pipe to spray biological reinforcement grout, so that the biological reinforcement grout can enter the soft soil inside the thin-walled steel pipe as evenly as possible.

[0024] This invention uses a grouting machine to pump bio-curing grout into one side of a thin-walled steel pipe under high pressure, while a vacuum pump is used to evacuate the other side of the steel pipe. Under the pressure difference between the two sides, the bio-curing grout is driven to move horizontally, so that the bio-curing grout can enter the soft soil inside the thin-walled steel pipe as evenly as possible, and solidify the soft soil inside the thin-walled steel pipe in situ.

[0025] In this invention, during the spraying of biological reinforcement slurry at the second inlet and outlet, the thin-walled steel pipe can effectively prevent the biological reinforcement slurry from overflowing, ensuring the reinforcement effect of the biologically solidified soil inside the thin-walled steel pipe.

[0026] This invention utilizes an air compressor to inject high-pressure gas into the inner wall of a thin-walled steel pipe, cutting through soft soil during the sinking process of the thin-walled steel pipe, assisting the thin-walled steel pipe to sink to the design elevation, and also facilitating the subsequent uniform reinforcement of the soft soil inside the thin-walled steel pipe.

[0027] The constraint effect of the thin-walled steel pipe of this invention puts the bio-stabilized soil inside the thin-walled steel pipe in a triaxial compression state, which significantly improves the stiffness and bearing capacity of the steel pipe bio-stabilized soil pile.

[0028] This invention makes only minor improvements to traditional steel pipe piles, maximizing the use of soft soil on site without increasing construction difficulty. It is a new type of pile foundation technology that is green, environmentally friendly, and easy to promote. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the steel pipe bio-stabilized soil pile construction system in the embodiment, where A represents the sinking condition of the thin-walled steel pipe and B represents the bio-stabilization condition of the soft soil inside the thin-walled steel pipe.

[0030] Figure 2 This is a schematic diagram of the steel pipe structure in the embodiment.

[0031] Figure 3 This is a schematic diagram of the internal structure of the steel pipe in the embodiment.

[0032] Figure 4 This is a schematic diagram of the cap structure in the embodiment.

[0033] In the diagram, 1. Thin-walled steel pipe; 2. Steel perforated pipe; 3. First inlet / outlet; 4. Second inlet / outlet; 5. Open pile tip; 6. Trapezoidal steel plate; 7. Pipe cap; 8. Through hole; 9. Second sealing ring; 10. First sealing ring; 11. Pressure-resistant hose; 12. Diverter; 13. Air compressor; 14. Air compressor outlet; 15. Air compressor power switch; 16. Air pressure control knob; 17. Dual-liquid grouting machine; 18. A-liquid injection hole; 19. B-liquid injection hole; 20. 1. Power switch for dual-liquid grouting machine; 21. Grouting pressure control knob; 22. A-liquid flow control knob; 23. B-liquid flow control knob; 24. B-liquid grout outlet; 25. A-liquid grout outlet; 26. Vacuum cylinder; 27. Vacuum cylinder air inlet; 28. Vacuum pressure gauge; 29. ​​Vacuum cylinder air outlet; 30. Vacuum pump; 31. Vacuum pump air extraction port; 32. Vacuum pressure control knob; 33. Vacuum pump power switch; 34. Bio-stabilized soil; 35. Steel blade angle. Detailed Implementation

[0034] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0037] Example 1: This example is a steel pipe bio-curing soil pile construction system, including steel pipe structure and grouting machine, etc.

[0038] In this example, the steel pipe structure has thin-walled steel pipes. The bottom of the thin-walled steel pipes is welded and fixed to the open pile tip. Multiple trapezoidal steel plates are evenly welded to the outer side of the open pile tip. Four steel perforated pipes are evenly distributed on the inner wall of the thin-walled steel pipes, and the steel perforated pipes are arranged along the entire length of the inner wall of the thin-walled steel pipes.

[0039] In this embodiment, the cross-section of the steel pipe is trapezoidal. The upper end of the steel pipe is flush with the top of the thin-walled steel pipe. A steel blade is welded to the bottom of the steel pipe. The height of the steel blade is 5cm. The bottom of the steel blade is flush with the bottom of the open pile tip.

[0040] In this example, a first inlet / outlet is provided on the upper end face of the steel perforated pipe, and several second inlets / outlets are evenly distributed on the side of the steel perforated pipe. The inside of the steel perforated pipe has a connecting channel that connects the first inlet / outlet and all the second inlets / outlets on the steel perforated pipe. Filter cloth is arranged inside the steel perforated pipe. The diameter of the second inlet / outlet is 10-15mm, and the distance between the second inlet / outlet is 50-100mm.

[0041] In this embodiment, a dual-liquid grouting machine is used. Under the second working condition (including the bio-solidification condition of soft soil inside thin-walled steel pipe), the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine are connected to the first inlet and outlet on the top surface of the steel flower pipe inside the thin-walled steel pipe via pressure-resistant hoses.

[0042] The construction method of the steel pipe bio-stabilized soil pile in this embodiment specifically includes the following steps:

[0043] The first step is to level and compact the construction site, measure and locate the exact position of the steel pipe bio-stabilized soil piles according to the engineering design drawings, and mark them.

[0044] The second step is to move the static pile driver to the reinforcement area and ensure that the pile frame is vertical.

[0045] The third step is to use a static pile driver to lower the thin-walled steel pipe to the design elevation.

[0046] The fourth step involves lowering the thin-walled steel pipe to the design elevation, entering the second working condition. Based on field or laboratory test results, select appropriate microbial solutions, reaction solutions, pumping rates, and pumping pressures. Add the microbial solution and reaction solution to the dual-liquid grouting machine through the A-liquid injection port and B-liquid injection port, respectively. Connect the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine to the first inlet and outlet of the steel perforated pipe inside the thin-walled steel pipe via pressure-resistant hoses. Turn on the power switch of the dual-liquid grouting machine and adjust the appropriate grouting pressure, A-liquid flow rate, and B-liquid flow rate using the grouting pressure control knob, A-liquid flow rate control knob, and B-liquid flow rate control knob.

[0047] Fifth step: After completing the injection of biological reinforcement grout according to the design requirements, move the static pile driver to the next pile position and repeat steps (iii) to (iv) to carry out the construction of steel pipe biological solidification soil piles and complete all on-site reinforcement operations.

[0048] Example 2: This example is a steel pipe bio-curing soil pile construction system, including steel pipe structure, grouting machine and vacuum pump, etc.

[0049] In this example, the steel pipe structure has thin-walled steel pipes. The bottom of the thin-walled steel pipes is welded and fixed to the open pile tip. Multiple trapezoidal steel plates are evenly welded to the outer side of the open pile tip. Four steel perforated pipes are evenly distributed on the inner wall of the thin-walled steel pipes, and the copper length of the steel perforated pipes is arranged on the inner wall of the thin-walled steel pipes.

[0050] In this embodiment, the cross-section of the steel pipe is trapezoidal. The upper end of the steel pipe is flush with the top of the thin-walled steel pipe. A steel blade is welded to the bottom of the steel pipe. The height of the steel blade is 5cm. The bottom of the steel blade is flush with the bottom of the open pile tip.

[0051] In this example, a first inlet / outlet is provided on the upper end face of the steel perforated pipe, and several second inlets / outlets are evenly distributed on the side of the steel perforated pipe. The inside of the steel perforated pipe has a connecting channel that connects the first inlet / outlet and all the second inlets / outlets on the steel perforated pipe. Filter cloth is arranged inside the steel perforated pipe. The diameter of the second inlet / outlet is 10-15mm, and the distance between the second inlet / outlet is 50-100mm.

[0052] In this embodiment, a dual-liquid grouting machine is used. Under the second working condition (including the bio-solidification condition of soft soil inside thin-walled steel pipe), the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine are connected to the first inlet and outlet on the top surface of the two steel flower pipes on one side of the thin-walled steel pipe through pressure-resistant hoses.

[0053] In this example, under the second operating condition, the vacuum pump is connected to the first inlet and outlet of the top surface of the two steel perforated pipes on the other side of the thin-walled steel pipe via the vacuum pump extraction port, pressure-resistant hose, vacuum cylinder, pressure-resistant hose, distributor, and pressure-resistant hose (the steel perforated pipes connected to the grouting machine and the steel perforated pipes connected to the vacuum pump are arranged symmetrically about the center of the thin-walled steel pipe axis).

[0054] In this example, under the second working condition, the top of the thin-walled steel pipe is equipped with a cap that can close the opening at the upper end of the thin-walled steel pipe. The cap has a round steel sleeve with an inner diameter that matches the outer diameter of the thin-walled steel pipe, and a top steel plate that closes the opening at the upper end of the round steel sleeve. The top steel plate has a through hole that matches the upper end of the steel pipe.

[0055] The inner wall of the round steel sleeve is provided with a first sealing rubber ring, which can seal the gap between the round steel sleeve and the thin-walled steel pipe when the round steel sleeve is fitted on the top of the thin-walled steel pipe; the through hole of the pipe cap is provided with a second sealing rubber ring, which can seal the gap between the through hole and the steel pipe when the pipe cap is installed on the top of the thin-walled steel pipe.

[0056] The construction method of the steel pipe bio-stabilized soil pile in this embodiment specifically includes the following steps:

[0057] The first step is to level and compact the construction site, measure and locate the exact position of the steel pipe bio-stabilized soil piles according to the engineering design drawings, and mark them.

[0058] The second step is to move the static pile driver to the reinforcement area and ensure that the pile frame is vertical.

[0059] The third step is to use a static pile driver to lower the thin-walled steel pipe to the design elevation.

[0060] The fourth step involves lowering the thin-walled steel pipe to the design elevation, entering the second working condition. Based on field or laboratory test results, select appropriate microbial solutions, reaction solutions, pumping rates, and pumping pressures. Add the microbial solution and reaction solution to the dual-liquid grouting machine through the A-liquid injection port and B-liquid injection port, respectively. Install a pipe cap on the top of the thin-walled steel pipe, and connect the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine to the first inlet and outlet on the top surface of the steel perforated pipe on one side of the thin-walled steel pipe via pressure-resistant hoses. Turn on the power switch of the dual-liquid grouting machine, and adjust the appropriate grouting pressure, A-liquid flow rate, and B-liquid flow rate using the grouting pressure control knob, A-liquid flow rate control knob, and B-liquid flow rate control knob.

[0061] Fifth, using a pressure-resistant hose, connect the vacuum pump to the first inlet and outlet on the top surface of the two steel perforated pipes on the other side of the thin-walled steel pipe. Turn on the vacuum pump power switch, and adjust the appropriate vacuum level using the vacuum pressure control knob according to the results of field or indoor tests. Under the action of the pressure difference between the two sides inside the thin-walled steel pipe, the biological reinforcement slurry is driven to move horizontally, uniformly solidifying the soft soil inside the thin-walled steel pipe in situ.

[0062] Step 6: After completing the injection of biological reinforcement grout according to the design requirements, move the static pile driver to the next pile location and repeat steps (3) to (5) to carry out the construction of steel pipe biological solidification soil piles and complete all on-site reinforcement operations.

[0063] Example 3: This example is a steel pipe bio-curing soil pile construction system, including steel pipe structure, air compressor, grouting machine and vacuum pump, etc.

[0064] In this example, the steel pipe structure has thin-walled steel pipes. The bottom of the thin-walled steel pipes is welded and fixed to the open pile tip. Multiple trapezoidal steel plates are evenly welded to the outer side of the open pile tip. Four steel perforated pipes are evenly distributed on the inner wall of the thin-walled steel pipes, and the copper length of the steel perforated pipes is arranged on the inner wall of the thin-walled steel pipes.

[0065] In this embodiment, the cross-section of the steel pipe is trapezoidal. The upper end of the steel pipe is flush with the top of the thin-walled steel pipe. A steel blade is welded to the bottom of the steel pipe. The height of the steel blade is 5cm. The bottom of the steel blade is flush with the bottom of the open pile tip.

[0066] In this example, a first inlet / outlet is provided on the upper end face of the steel perforated pipe, and several second inlets / outlets are evenly distributed on the side of the steel perforated pipe. The inside of the steel perforated pipe has a connecting channel that connects the first inlet / outlet and all the second inlets / outlets on the steel perforated pipe. Filter cloth is arranged inside the steel perforated pipe. The diameter of the second inlet / outlet is 10-15mm, and the distance between the second inlet / outlet is 50-100mm.

[0067] In this embodiment, the air compressor is connected to the first inlet and outlet on the top surface of the steel pipe under the first working condition (including the thin-walled steel pipe sinking condition) through the air compressor outlet, pressure-resistant hose, distributor, and pressure-resistant hose respectively.

[0068] In this embodiment, a dual-liquid grouting machine is used. Under the second working condition (including the bio-solidification condition of soft soil inside thin-walled steel pipe), the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine are connected to the first inlet and outlet on the top surface of the two steel flower pipes on one side of the thin-walled steel pipe through pressure-resistant hoses.

[0069] In this example, under the second operating condition, the vacuum pump is connected to the first inlet and outlet of the top surface of the two steel perforated pipes on the other side of the thin-walled steel pipe via the vacuum pump extraction port, pressure-resistant hose, vacuum cylinder, pressure-resistant hose, distributor, and pressure-resistant hose (the steel perforated pipes connected to the grouting machine and the steel perforated pipes connected to the vacuum pump are arranged symmetrically about the center of the thin-walled steel pipe axis).

[0070] In this example, under the second working condition, the top of the thin-walled steel pipe is equipped with a cap that can close the opening at the upper end of the thin-walled steel pipe. The cap has a round steel sleeve with an inner diameter that matches the outer diameter of the thin-walled steel pipe, and a top steel plate that closes the opening at the upper end of the round steel sleeve. The top steel plate has a through hole that matches the upper end of the steel pipe.

[0071] The inner wall of the round steel sleeve is provided with a first sealing rubber ring, which can seal the gap between the round steel sleeve and the thin-walled steel pipe when the round steel sleeve is fitted on the top of the thin-walled steel pipe; the through hole of the pipe cap is provided with a second sealing rubber ring, which can seal the gap between the through hole and the thin-walled steel pipe when the pipe cap is installed on the top of the thin-walled steel pipe.

[0072] The construction method of the steel pipe bio-stabilized soil pile in this embodiment specifically includes the following steps:

[0073] The first step is to level and compact the construction site, measure and locate the exact position of the steel pipe bio-stabilized soil piles according to the engineering design drawings, and mark them.

[0074] The second step is to move the static pile driver to the reinforcement area and ensure that the pile frame is vertical.

[0075] The third step is to connect the first inlet and outlet of the steel pipe to the air compressor via a pressure-resistant hose before pile driving. Turn on the air compressor power switch and adjust the appropriate gas pressure using the air pressure control knob according to the results of field or indoor tests.

[0076] The fourth step involves entering the first working condition. During the sinking process of the thin-walled steel pipe, the high-pressure gas ejected from the second inlet and outlet is used to cut the soft soil inside the thin-walled steel pipe, assisting the thin-walled steel pipe to sink to the design elevation. This also facilitates the subsequent uniform reinforcement of the soft soil inside the steel pipe.

[0077] Step 5: The thin-walled steel pipe is lowered to the design elevation to enter the second working condition, and the air compressor is disconnected. Based on the results of field or laboratory tests, select appropriate microbial solution, reaction solution, pumping rate, and pumping pressure. Add the microbial solution and reaction solution to the dual-liquid grouting machine through the A-liquid injection port and B-liquid injection port, respectively. Install a pipe cap on the top of the thin-walled steel pipe, and connect the A-liquid outlet and B-liquid outlet of the dual-liquid grouting machine to the first inlet and outlet on the top surface of the steel perforated pipe on one side of the thin-walled steel pipe via pressure-resistant hoses. Turn on the power switch of the dual-liquid grouting machine, and adjust the appropriate grouting pressure, A-liquid flow rate, and B-liquid flow rate using the grouting pressure control knob, A-liquid flow rate control knob, and B-liquid flow rate control knob.

[0078] Step 6: Using a pressure-resistant hose, connect the vacuum pump to the first inlet / outlet on the top surface of the steel perforated pipe on the other side of the thin-walled steel pipe. Turn on the vacuum pump power switch and adjust the appropriate vacuum level using the vacuum pressure control knob, based on the results of field or indoor tests. Under the pressure difference between the two sides inside the thin-walled steel pipe, the bio-reinforced slurry is driven to move horizontally, uniformly solidifying the soft soil inside the thin-walled steel pipe in situ.

[0079] Step 7: After completing the injection of biological reinforcement grout according to the design requirements, move the static pile driver to the next pile location and repeat steps (3) to (6) to carry out the construction of steel pipe biological solidification soil piles and complete all on-site reinforcement operations.

[0080] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A steel pipe bio-cemented soil pile construction system, characterized by, Comprise: Steel pipe structure, with thin-walled steel pipe, thin-walled steel pipe inner wall on the uniform distribution of at least two steel flower pipe, steel flower pipe upper end is equipped with the first import and export, steel flower pipe side is equipped with a plurality of second import and export, steel flower pipe has the communication channel that communicates first, second import and export; Grouting machine, can be in the second working condition through the anti-pressure hose and at least two first import and export of the steel flower pipe, can be through the second import and export of steel flower pipe for the soft soil in the thin-walled steel pipe to provide biological reinforcement slurry; Vacuum pump, can be in the second working condition through the anti-pressure hose and at least two first import and export of the steel flower pipe, can be through the second import and export of steel flower pipe for the soft soil in the thin-walled steel pipe to provide negative pressure; Air compressor, can be in the first working condition through the anti-pressure hose and at least two first import and export of the steel flower pipe, can be through the second import and export of steel flower pipe for the soft soil in the thin-walled steel pipe to provide high pressure gas; The cross section of the steel flower pipe is trapezoidal section, and steel blade angle is welded at the bottom of the steel flower pipe;The diameter of the second import and export is 10~15mm, and the spacing between the second import and export is 50~100mm; The steel pipe biological solidification soil pile construction method, comprising: Enter the first working condition, pile sinking of steel pipe structure, air compressor through the anti-pressure hose and the second import and export of steel flower pipe on the steel pipe structure to provide high pressure gas for the soft soil in the thin-walled steel pipe during the sinking process of steel pipe structure; After the completion of pile sinking, enter the second working condition, biological solidification of soft soil in the steel pipe structure, grouting machine through the anti-pressure hose and the second import and export of steel flower pipe on the steel pipe structure to provide biological reinforcement slurry for the soft soil in the thin-walled steel pipe, vacuum pump through the anti-pressure hose and the second import and export of steel flower pipe on the steel pipe structure to provide negative pressure for the soft soil in the thin-walled steel pipe.

2. The steel pipe bio-cured soil pile construction system according to claim 1, characterized in that: The steel flower pipe connected with the grouting machine and the steel flower pipe connected with the vacuum pump are symmetrically arranged about the axis center of the thin-walled steel pipe.

3. The steel pipe bio-cured soil pile construction system according to claim 1, characterized in that: The lower end of the thin-walled steel pipe is connected with an open pile tip, and a plurality of trapezoidal steel plates are uniformly welded on the outer side of the open pile tip.

4. The steel pipe bio-cured soil pile construction system according to claim 1, characterized in that: In the second working condition, the top of the thin-walled steel pipe is provided with a pipe cap capable of closing the upper end opening of the thin-walled steel pipe.

5. The steel pipe bio-cured soil pile construction system according to claim 4, characterized in that: The pipe cap has a round steel sleeve with an inner diameter matched with the outer diameter of the thin-walled steel pipe, and a top surface steel plate closing the upper end opening of the round steel sleeve, and a through hole corresponding to the steel flower pipe is formed in the top surface steel plate; A first sealing rubber ring is arranged on the inner wall of the round steel sleeve, and a second sealing rubber ring is arranged at the through hole of the pipe cap.

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