Vacuum pumping and gas lifting combined soft soil foundation efficient consolidation system and method

Abstract

The invention discloses a vacuumizing and gas lifting combined soft soil foundation efficient consolidation system and method.The vacuumizing and gas lifting combined soft soil foundation efficient consolidation system comprises a discrete material filtering and collecting assembly, a vacuumizing assembly and a gas injection and drainage assembly, the discrete material filtering and collecting assembly comprises a discrete material pile and a customized floral tube, a floral tube body of the customized floral tube is used for collecting water, and high-pressure gas can be injected into a gas inlet pipeline; the vacuumizing assembly enables water of the soft soil foundation to gather towards the floral tube through the vacuum pump and the air exhaust and drainage pipeline, and the air injection and drainage assembly enables a floral tube body to form internal and external pressure difference through an air compression pump and an air injection pipeline. By periodically operating the vacuumizing assembly and the gas injection and drainage assembly, the problem of soil drainage is solved, loss of foundation materials is prevented, water stored in the floral tube is quickly emptied by means of the gas lift effect, accumulation and drainage of water of a soft soil foundation are accelerated, and the soil reinforcement effect and the construction engineering quality are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soft soil foundation treatment, and particularly relates to a high-efficiency consolidation system and method for soft soil foundation by combining vacuum pumping and air-lift. Background Art

[0002] In civil engineering construction, the treatment of soft soil foundation is a crucial link. Especially for engineering projects in coastal areas and near inland lakes and rivers, its importance is even more prominent. Soft soil is widely distributed in these areas. Due to the poor properties of soft soil such as high water content, high compressibility, and low strength, when bearing loads such as buildings, significant settlement and deformation are likely to occur. This will not only cause problems such as building wall cracking and ground subsidence, affecting the normal use of buildings, but also may threaten people's lives and property safety, posing a severe challenge to the project quality and safety. Therefore, improving the stability and bearing capacity of soft soil foundation has become the key to ensuring the long-term safe operation of the project.

[0003] At present, in the field of soft soil foundation treatment, the main methods include the drainage consolidation method, the concrete pouring method, and the composite foundation method, etc. The drainage consolidation method is widely used, especially the vacuum preloading method. It forms drainage channels in the soft soil foundation, such as drainage sand wells, plastic drainage plates, etc., and lays a drainage layer on the ground surface. By using the film sealing technology and vacuum device to pump air, an air pressure difference is formed, thereby accelerating the drainage consolidation of the foundation, reducing the water content of the foundation, and increasing the foundation strength. However, this method has certain limitations. When treating cohesive soil foundations with poor permeability, the drainage speed is slow, resulting in a long treatment period, sometimes even taking several months to several years, which greatly affects the project progress and increases the project cost. In addition, the long-term air pumping operation also consumes a large amount of energy.

[0004] The concrete pouring method fills concrete into each slot hole by means of vibration sinking formwork and on-site pouring to ensure the stability of the foundation. Although this method can significantly improve the reinforcement effect of the foundation and greatly increase the bearing capacity of the foundation, it has a high cost. The concrete material itself is expensive, and the construction process is complex, requiring professional equipment and technical personnel for operation. At the same time, it will also cause relatively large noise and vibration pollution to the surrounding environment. Moreover, this method is not applicable to all types of soft soil foundations. For some special geological conditions, such as areas with a large thickness of soft soil and a high groundwater level, the implementation difficulty is relatively large.

[0005] The composite foundation method reduces the total settlement and improves the bearing effect of the foundation by strengthening part of the natural soil mass to form a composite structure. However, there are also some problems in its practical application. It usually requires a large amount of building materials, such as sand, gravel, cement, etc., which not only increases the project cost but also may have a certain impact on the environment, such as ecological damage caused by material extraction. Moreover, under certain complex geological conditions, its strengthening effect may not be satisfactory and cannot meet the design requirements of the project.

[0006] In summary, the existing soft soil foundation treatment methods all have their own defects and are difficult to meet the growing needs of engineering construction. It is urgent to develop a soft soil foundation treatment method that is efficient, economical, environmentally friendly and has a wide range of applications. Summary of the Invention

[0007] To solve the problems in the background technology, the present invention provides a high-efficiency consolidation system and method for soft soil foundation by combining vacuum pumping and air-lifting. A filtering system is composed of an integrated customized perforated pipe and a granular material pile. By combining the periodic cyclic operation of vacuum pumping negative pressure drainage and air-lifting positive pressure drainage, the efficient aggregation and discharge of soil moisture are realized, effectively solving the problem of difficult soil drainage, avoiding the loss of foundation materials. At the same time, through this method, not only the aggregation and discharge of moisture in the soft soil foundation are accelerated, but also the water stored in the perforated pipe is quickly emptied through the air-lifting effect, significantly improving the reinforcement effect of the soil and the construction quality of the project.

[0008] The present invention is realized through the following technical solutions:

[0009] A high-efficiency consolidation system for soft soil foundation by combining vacuum pumping and air-lifting, comprising:

[0010] A granular filtering and collecting component, the granular filtering and collecting component includes multiple groups of granular material piles buried in the soft soil foundation and customized perforated pipes inserted inside the granular material piles. Among them, the customized perforated pipe includes a perforated pipe body for water collection and an air inlet pipe integrally connected thereto. The air outlet at the bottom end of the air inlet pipe is located at the center of the bottom of the perforated pipe body and the air outlet direction is towards the inside of the perforated pipe;

[0011] A vacuum pumping component, the vacuum pumping component includes a vacuum pump, and the vacuum pump is connected to the top end of the perforated pipe body through an air extraction and drainage pipeline;

[0012] An air injection and drainage component, the air injection and drainage component includes an air compressor, and the air compressor injects high-pressure gas into the air inlet pipe through an air injection pipeline to form an internal and external pressure difference in the perforated pipe body.

[0013] In this solution, the granular material piles and the customized perforated pipes in the granular filtration and collection component cooperate with each other to filter the foundation soil, prevent soil particles from entering the perforated pipes and causing soil loss in the foundation, and at the same time provide a channel for water to enter the perforated pipes. The vacuum extraction component uses a vacuum pump to communicate with the top of the perforated pipe body through an air extraction and drainage pipeline, which can accelerate the accumulation of water in the soft foundation soil into the perforated pipe. Then, through the air injection and drainage component, a high-pressure gas is injected into the intake pipeline through an air injection pipeline by means of an air compressor, creating an internal and external pressure difference in the perforated pipe body. Using the air-lift effect, the water stored in the perforated pipe is quickly emptied. Through the method of vacuum extraction negative pressure drainage and air-lift positive pressure drainage, the efficient accumulation and discharge of soil moisture are realized, effectively solving the problem of difficult soil drainage, and thus improving the reinforcement effect of the soft foundation and the construction quality of the project.

[0014] As an optimized solution for the high-efficiency consolidation system of soft foundation, the length of the granular material pile is not less than the length of the customized perforated pipe.

[0015] In this solution, the length of the granular material pile not being less than the length of the customized perforated pipe can ensure that there is enough granular material around the customized perforated pipe to provide water sources during the process of collecting water. The granular material pile can fully filter the water in the soft soil, allowing more water to smoothly enter the customized perforated pipe, improving the drainage effect. And a longer granular material pile can better support the customized perforated pipe, preventing it from tilting, displacing, etc. in the soft foundation, ensuring the stability of the entire system, and enabling the vacuum extraction and air-lift drainage operations to proceed stably.

[0016] As an optimized solution for the high-efficiency consolidation system of soft foundation, the vacuum extraction component further includes a sealing film, which covers the surface of the soft foundation, forming a closed space inside the granular material pile and the customized perforated pipe.

[0017] In this solution, the sealing film covers the surface of the soft foundation, forming a closed space inside the granular material pile and the customized perforated pipe. This closed space can effectively prevent external air from entering, ensuring that the vacuum pump can form a stable negative pressure environment inside the perforated pipe body. This not only enhances the vacuum extraction effect, making the water in the soft foundation accumulate more efficiently into the perforated pipe under the action of the pressure difference, but also prevents energy loss caused by air leakage and reduces energy consumption. At the same time, the stable negative pressure environment can prevent the water in the soft foundation from redistributing due to external interference before being fully extracted, ensuring the continuity and stability of drainage, and thus improving the consolidation efficiency of the soft foundation.

[0018] As an optimized solution for the high-efficiency consolidation system of soft foundation, the edge of the sealing film is sealed by a film pressing groove.

[0019] In this solution, after the edge of the sealing film is pressed into the film pressing groove and sealed, it is difficult for external air to penetrate into the space formed by the below of the sealing film, the granular material pile and the customized flower tube. This creates a necessary condition for creating a stable negative pressure environment for the vacuum extraction assembly, ensuring that the vacuum pump can work efficiently and enabling the moisture in the soft soil foundation to converge smoothly towards the flower tube body. At the same time, it effectively avoids the situation where the air leakage causes the air pressure difference to be unstable, thereby affecting the drainage efficiency.

[0020] As an optimized solution for the high-efficiency consolidation system of soft soil foundation, water inlet holes are arranged on the outer side wall of the flower tube body, and the water inlet holes are distributed in a plum blossom shape.

[0021] In this solution, the plum blossom shape distribution makes the water inlet holes more evenly distributed on the flower tube body, can collect the moisture in the soft soil foundation in all directions. Compared with other distribution methods, it can effectively avoid the situation of insufficient local moisture collection and improve the moisture collection efficiency. Moreover, this distribution method can also enhance the structural stability of the flower tube body, avoid the structural weak points caused by the concentrated distribution of the water inlet holes, and ensure that the flower tube is not easily damaged when bearing the soft soil pressure and water flow scouring. At the same time, the water inlet holes distributed in a plum blossom shape are conducive to the better functioning of the filter layer between the granular material pile and the flower tube body, enabling the moisture in the soft soil to smoothly enter the water inlet holes through the filter layer, while the soil particles are effectively blocked outside to prevent the loss of foundation soil.

[0022] As an optimized solution for the high-efficiency consolidation system of soft soil foundation, a filter layer is formed between the granular material pile and the flower tube body, and the filter layer is filled with sand and gravel or crushed gravel, and the particle size of the sand and gravel is larger than the size of the water inlet holes of the flower tube body.

[0023] In this solution, a filter layer filled with sand and gravel or crushed gravel with a particle size larger than the water inlet hole size of the flower tube body is arranged between the granular material pile and the flower tube body. It can effectively prevent the soil particles in the soft soil foundation from entering the flower tube along with the moisture, avoid the blockage of the flower tube, ensure the smooth drainage channel, and maintain the stable operation of the system. At the same time, the filter layer allows the moisture to pass through smoothly, playing a good water permeability role, enabling the moisture in the soft soil foundation to continuously converge towards the flower tube body and enhancing the drainage effect.

[0024] As an optimized solution for the high-efficiency consolidation system of soft soil foundation, a drainage valve and an air extraction valve are provided on the air extraction and drainage pipeline;

[0025] Among them, the vacuum pump is connected to the tail end of the air extraction and drainage pipeline. In front of the vacuum pump, the air extraction valve and a three-way valve are connected in series. One end of the three-way valve is connected to the drainage valve, the outlet of the drainage valve is located in the ground drainage trough, and the other end of the three-way valve is connected to the flower tube body.

[0026] In this solution, the drainage valve and the air extraction valve are arranged so that the air extraction and drainage pipeline can flexibly switch between the air extraction and drainage functions. The vacuum pump is connected to the end of the air extraction and drainage pipeline, and the air extraction valve is located in front of it. When the air extraction valve is opened and the vacuum pump is started, a negative pressure can be formed inside the perforated pipe body to extract water and air from the soft soil foundation, accelerating the drainage consolidation of the soil mass. The three-way valve connects the drainage valve to the perforated pipe body. When drainage is required, the air extraction valve is closed and the drainage valve is opened. The water accumulated inside the perforated pipe body is discharged into the ground drainage trough under the action of gravity or air-lift pressure. In this way, the orderly progress of air extraction and drainage operations during the system operation is ensured, and the effective control and discharge of the moisture in the soft soil foundation are realized.

[0027] An efficient consolidation method for soft soil foundation combining vacuum pumping and air-lift includes the following steps:

[0028] Step 1, lay a sand cushion layer, level it, and lay a sealing film on the surface of the soft soil foundation;

[0029] Step 2, measure and set out the lines. After determining the number and distribution of the drill holes, drill to the elevation;

[0030] Step 3, after placing the customized perforated pipe into the drill hole, fill in the granular material to form a granular material pile;

[0031] Step 4, connect the upper ends of all the air inlet pipelines and the exhaust ports at the upper end of the perforated pipe body to the air injection pipeline and the air extraction and drainage pipeline respectively through the connection ports;

[0032] Step 5, connect the air injection pipeline and the air extraction and drainage pipeline to the air compressor pump and the vacuum pump respectively, and install valves;

[0033] Step 6, debug the air compressor pump and the vacuum pump, and check the air tightness of each valve;

[0034] Step 7, only open the air extraction valve, start the vacuum pump, and reduce the air pressure inside the perforated pipe body to the designed value. The surface settlement amount and the vacuum degree under the film should be continuously detected;

[0035] Step 8, close the air extraction valve and let it stand still until the perforated pipe body is filled with water;

[0036] Step 9, repeat Step 7 and Step 8 until the water level inside the perforated pipe body reaches the requirement;

[0037] Step 10, open the air injection valve and the drainage valve, and start the air compressor pump;

[0038] Step 11, repeat Step 7, Step 8, Step 9 and Step 10 until the soft soil foundation reaches the preset effect.

[0039] In this solution, a sand cushion layer and a sealing film are laid to create a stable basic environment for subsequent operations. The sealing film can ensure the vacuum pumping effect. Measuring, setting out lines and drilling determine the positions and depths of the system components, ensuring a reasonable layout. The installation of customized perforated pipes and granular columns constructs the basic structure for drainage and filtration. Connecting pipes, installing equipment and checking airtightness ensure the normal operation of the system. By controlling the air extraction valve and the vacuum pump, the moisture in the soft soil foundation is gathered towards the perforated pipes under negative pressure. Repeatedly circulating the water filling operation allows the moisture to accumulate sufficiently. Finally, open the air injection valve, the drainage valve and start the air compressor pump, and use the air-lift effect to drain the water stored in the perforated pipes. Repeating these steps can continuously and efficiently drain the moisture in the soft soil foundation, gradually improve the reinforcement effect of the soil mass, until the preset soft soil foundation treatment goal is achieved, ensuring the stability and safety of the project.

[0040] A geotextile protective layer is covered above the sealing film, and the edge of the sealing film is sealed by a film pressing groove.

[0041] In this solution, the geotextile protective layer can prevent mechanical damage to the sealing film during subsequent construction. For example, when laying other materials or equipment, it can prevent sharp objects from cutting the sealing film, ensuring the integrity of the sealing film and maintaining its sealing performance. The edge of the sealing film is sealed by a film pressing groove, which can effectively prevent external air from entering the space between the sealing film and the soft soil foundation, ensuring a stable negative pressure environment during vacuum pumping. A stable sealing environment is the basis for vacuum pumping operations, which helps the moisture in the soft soil foundation to gather towards the perforated pipes smoothly under the action of the pressure difference, improving the drainage efficiency.

[0042] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0043] 1. Through the filtration system composed of an integrally customized perforated pipe and granular columns, and by combining the periodic cyclic operations of vacuum pumping negative pressure drainage and air-lift positive pressure drainage, the present invention can achieve the efficient aggregation and drainage of soil moisture. The existing drainage consolidation method has a slow drainage speed and a long treatment period when dealing with cohesive soil foundations with poor permeability. However, the present invention effectively solves the problem of difficult soil drainage, accelerates the aggregation and drainage of moisture in the soft soil foundation, and significantly improves the drainage efficiency.

[0044] 2. Through the air-lift effect, the present invention can quickly empty the water stored in the perforated pipes, significantly improving the soil reinforcement effect. Compared with the high cost, complex construction and inapplicability to all soft soil foundations of the concrete pouring method, and the unsatisfactory reinforcement effect of the composite foundation method under certain complex geological conditions, the present invention effectively improves the construction quality through the combined vacuum pumping and air-lift operation methods.

[0045] 3. The present invention is not overly restricted by the type of soft soil foundation. Whether it is the soft soil foundation in coastal areas or the soft soil foundation near inland lakes and rivers, it can be applied, having a broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0047] Figure 1 It is the overall layout diagram of an efficient consolidation system for soft soil foundation by combining vacuum pumping and air-lifting according to the present invention.

[0048] Figure 2 It is the cross-sectional view of a customized perforated pipe in an efficient consolidation system for soft soil foundation by combining vacuum pumping and air-lifting according to the present invention.

[0049] Figure 3 It is the operation flow chart of an efficient consolidation method for soft soil foundation by combining vacuum pumping and air-lifting according to the present invention.

[0050] Figure 4 It is the air-lifting schematic diagram in an efficient consolidation method for soft soil foundation by combining vacuum pumping and air-lifting according to the present invention.

[0051] Markings in the drawings and corresponding component names:

[0052] 1 - Soft soil foundation; 2 - Granular material pile; 3 - Customized perforated pipe; 3 - 1 - Perforated pipe body; 3 - 2 - Air inlet pipe; 4 - Sealing film; 5 - Air extraction and drainage pipe; 6 - Air injection pipe; 7 - Drainage connection port; 8 - Air injection connection port; 9 - Drainage valve; 10 - Air extraction valve; 11 - Air injection valve; 12 - Air compressor pump; 13 - Vacuum pump; 14 - Ground drainage trough; 15 - Water outlet; 16 - Positive pressure gas. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0054] Embodiment

[0055] This embodiment provides an efficient consolidation system for soft soil foundation by combining vacuum pumping and air-lifting. As Figure 1 - Figure 2 shown, it includes a granular filtration and collection component, a vacuum pumping component, and an air injection and drainage component. By periodically operating the vacuum pumping component and the air injection and drainage component, the problem of difficult soil drainage can be effectively solved.

[0056] Among them, as Figure 1As shown in the figure, the granular filtration and collection component includes three or more groups of granular material piles 2 buried in the soft soil foundation 1 and customized perforated pipes 3 inserted inside the granular material piles 2. The customized perforated pipe 3 includes a perforated pipe body 3-1 for water collection and an air inlet pipe 3-2 integrally connected thereto. The bottom air outlet of the air inlet pipe 3-2 is located at the center of the bottom of the perforated pipe body 3-1 and the air outlet direction is towards the inside of the perforated pipe body 3-1.

[0057] Specifically, the granular material piles 2 are buried in the soft soil foundation 1. The granular material piles 2 are composed of a series of granular materials, such as sand or gravel. The perforated pipe body 3-1 is located inside the granular material piles 2, and its outer side wall is provided with water inlet holes, which are distributed in a plum blossom shape, facilitating the collection of water in the soft soil foundation in all directions. At the same time, the above-mentioned granular materials form a filter layer between the perforated pipe body 3-1 and the granular material piles 2, and the particle size of the sand is larger than the size of the water inlet holes of the perforated pipe body 3-1, which can effectively prevent soil particles in the soft soil foundation 1 from entering the perforated pipe along with the water, avoid clogging of the perforated pipe, ensure the smooth drainage channel, and maintain the stable operation of the system; at the same time, in some embodiments, in order to improve the drainage effect, the length of the granular material piles 2 is not less than the length of the customized perforated pipe 3.

[0058] And, as Figure 1 and Figure 2 shown in the figure, the air inlet pipes 3-2 are arranged in parallel and fixed on the outer surface of the perforated pipe body 3-1. The bottom air outlet of the air inlet pipe 3-2 is located at the center of the bottom of the perforated pipe body 3-1 and the air outlet direction is towards the inside of the perforated pipe body 3-1. The top end of the air inlet pipe 3-2 is higher than the top end of the perforated pipe body 3-1 and is connected to the air injection pipeline 6 through the air injection connection port 8. The top of the perforated pipe body 3-1 is connected to the air extraction and drainage pipeline 5 through the drainage connection port 7. When a pressure difference is formed inside the perforated pipe body 3-1, the water collected in the perforated pipe body 3-1 will be discharged from the air extraction and drainage pipeline 5 through the vacuum extraction component.

[0059] Among them, please refer to Figure 1 shown in the figure again. The above-mentioned vacuum extraction component includes a vacuum pump 13 and a sealing film 4. The sealing film 4 covers the surface of the soft soil foundation 1, and the edge of the sealing film 4 is sealed through a film pressing groove, so as to form a closed space inside the granular material piles 2 and the perforated pipe body. The vacuum pump 13 is connected to the top end of the perforated pipe body 3-1 through the air extraction and drainage pipeline 5, so as to form a negative pressure at the top end of the perforated pipe body 3-1.

[0060] Specifically, the vacuum pump 13 is connected to the end of the air extraction and drainage pipeline 5. An air extraction valve 10 is provided in front of it. A three-way valve is provided in the air extraction and drainage pipeline 5 in front of the air extraction valve 10. A drainage valve 9 is connected to the lower end of the three-way valve. The drain port 15 is located below the drainage valve 9 and within the ground drainage trough 14. The air extraction and drainage pipeline 5 passes above all the bulk filtration and collection components in sequence and is connected to the upper end of the perforated pipe body 3-1 through the drainage connection nozzle 7. The gas injection and drainage assembly injects high-pressure gas into the intake pipeline 3-2 through the gas injection pipeline 6, so as to form high pressure at the bottom end of the perforated pipe body 3-1. In this way, an internal and external pressure difference is formed in the perforated pipe body 3-1, and the water stored in the perforated pipe body 3-1 is quickly emptied through the air-lift effect.

[0061] Among them, please refer to Figure 1 and Figure 2 As shown, the gas injection and drainage assembly further includes an air compressor pump 12 and an air injection valve 11. The air compressor pump 12 is located at the end of the gas injection pipeline 6. An air injection valve 11 is connected in front of it. The gas injection pipeline 6 passes above all the bulk filtration and collection components in sequence and is connected to the intake pipeline 3-2 through the gas injection connection nozzle 8. The air compressor pump 12 injects high-pressure gas into the intake pipeline 3-2 through the gas injection pipeline 8, so as to form an internal and external pressure difference in the perforated pipe body 3-1.

[0062] In this embodiment, by periodically operating the vacuum extraction assembly and the gas injection and drainage assembly, the problem of soil drainage is solved, the loss of foundation materials is prevented, and the water stored in the perforated pipe is quickly emptied by means of the air-lift effect, accelerating the aggregation and drainage of water in the soft soil foundation, and effectively improving the soil reinforcement effect and the construction project quality.

[0063] The specific operation steps are as follows:

[0064] Step 1, lay the sand cushion and level it, and lay the sealing film 4 on the surface of the soft soil foundation 1;

[0065] Step 2, measure and set out the lines. After determining the number and distribution of the drill holes, drill to the elevation;

[0066] Step 3, after placing the customized perforated pipe 3 into the drill hole, fill in the bulk material to form the bulk material pile 2;

[0067] Step 4, connect the exhaust ports at the upper ends of all the intake pipelines 3-2 and the upper end of the perforated pipe body 3-1 to the gas injection pipeline 6 and the air extraction and drainage pipeline 5 respectively through the connection nozzles;

[0068] Step 5, connect the gas injection pipeline 6 and the air extraction and drainage pipeline 5 to the air compressor pump 12 and the vacuum pump 13 respectively, and install valves;

[0069] Step 6, debug the air compressor pump 12 and the vacuum pump 13, and check the air tightness of each valve;

[0070] Step 7: Close the drain valve 9 and the air injection valve 11, open the air extraction valve 10, turn on the vacuum pump 13, and check the working performance and airtightness of the vacuum extraction assembly and the vacuum degree below the sealing film 4 through the pressure change in the flower tube body 3-1.

[0071] Step 8: Open the valve 11, keep the drain valve 9 and the air extraction valve 10 closed, turn on the air compressor pump 12, and check the working performance and airtightness of the air injection and drainage assembly through the pressure change in the flower tube body 3-1.

[0072] Step 9: After the above-mentioned steps 7 and 8 are completed and there are no problems, repeat step 7. When the air pressure in the flower tube body 3-1 and the vacuum degree below the sealing film 4 meet the requirements, close the vacuum pump 13 and the air extraction valve 10, and let it stand.

[0073] Step 10: Check the water filling condition in the flower tube body 3-1. When the water level does not meet the standard, repeat the above steps 7 and 9. When the water level meets the standard, open the drain valve 9 and the air injection valve 11, and turn on the air compressor pump 12. As Figure 4 shown, inject positive pressure gas 16 into the flower tube body 3-1 through the air injection and drainage assembly. At this time, the stored water in the flower tube body 3-1 enters the air extraction and drainage pipe 5 under the lifting action of the positive pressure gas 16 and is accelerated to drain into the ground drainage trough 14 from the water outlet 15 under the action of air lift. When the water outlet 15 stops draining or the drainage flow rate is lower than a certain value, close the drain valve 9, repeat steps 9 and 10, and cycle through the operations of vacuum extraction, water filling, and air lift drainage to continuously drain the water in the soft soil foundation and accelerate the consolidation of the foundation.

[0074] Step 11: Continuously measure the surface settlement amount and the water content of the soft soil foundation 1 for construction effect monitoring until the measured settlement amount reaches more than 80% of the calculated settlement value or the measured soil settlement rate is less than or equal to 0.5 mm / d for five consecutive days as the acceptance standard. After reaching the expected standard, turn off all equipment.

[0075] The above-mentioned specific implementation manners have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manners of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An efficient consolidation system for soft soil foundation combining vacuum extraction and gas lift, characterized in that: include: A bulk filtration and collection assembly, the bulk filtration and collection assembly comprising a plurality of bulk material piles (2) buried in a soft soil foundation (1) and a custom-made flower pipe (3) inserted inside the bulk material piles (2), wherein the custom-made flower pipe (3) comprises a flower pipe body (3-1) for collecting water and an air intake pipe (3-2) integrally connected thereto, the air outlet at the bottom end of the air intake pipe (3-2) being located at the center of the bottom of the flower pipe body (3-1) and the air outlet direction being toward the inside of the flower pipe; A vacuum pump component, the vacuum pump component comprising a vacuum pump (13), the vacuum pump (13) being connected to the top end of the flower tube body (3-1) via an air extraction and drainage pipeline (5); An air injection and drainage component, the air injection and drainage component comprising an air compression pump (12), the air compression pump (12) injects high-pressure gas into the air inlet pipe (3-2) through an air injection pipe (6), so that a pressure difference is formed between the inside and outside of the flower tube body (3-1).

2. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 1, characterized in that: The length of the bulk material pile (2) is not less than the length of the customized flower tube (3).

3. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 1, characterized in that: The vacuum assembly further comprises a sealing film (4), wherein the sealing film (4) covers the surface of the soft soil foundation (1), so that the bulk material pile (2) and the interior of the customized flower tube (3) form a closed space.

4. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 3 is characterized in that: The edge of the sealing film (4) is sealed by a die-casting groove.

5. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 3 is characterized in that: The outer wall of the flower tube body (3-1) is provided with water inlet holes, and the water inlet holes are distributed in a plum blossom shape.

6. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 5, characterized in that: A filter layer is formed between the bulk material pile (2) and the flower tube body (3-1), and the filter layer is filled with sand or crushed gravel, and the sand particle size is larger than the water inlet hole size of the flower tube body (3-1).

7. The high-efficiency consolidation system for soft soil foundation combining vacuum extraction and gas lift according to claim 1, characterized in that: The air extraction and drainage pipeline (5) is provided with a drainage valve (9) and an air extraction valve (10); The vacuum pump (13) is connected to the tail end of the air extraction and drainage pipeline (5), and the front of the vacuum pump (13) is connected to the air extraction valve (10) and the three-way valve in sequence, one end of the three-way valve is connected to the drainage valve (9), the outlet of the drainage valve (9) is located in the ground drainage groove (14), and the other end of the three-way valve is connected to the flower tube body (3-1).

8. A method for efficiently consolidating soft soil foundation by combining vacuum extraction and gas lift, characterized in that: The soft soil foundation efficient consolidation system according to any one of claims 1 to 7 comprises the following steps: Step 1, laying a sand cushion layer and leveling it, and laying a sealing film (4) on the surface of the soft soil foundation (1); Step 2: Measure and lay out, determine the number and distribution of holes, and then drill to the elevation; Step 3, after placing the customized flower tube (3) into the drilled hole, fill it with bulk material to form a bulk material pile (2); Step 4, connecting the upper ends of all air inlet pipes (9) and the exhaust ports at the upper end of the flower tube body (3-1) to the air injection pipe (6) and the air extraction and drainage pipe (5) through the connecting pipe ports; Step 5, connecting the air injection pipeline (6) and the air extraction and drainage pipeline (5) to the air compression pump (12) and the vacuum pump (13), respectively, and installing valves; Step 6, debug the air compression pump (12) and the vacuum pump (13), and check the air tightness of each valve; Step 7, only open the air extraction valve (10), start the vacuum pump (13), and reduce the air pressure in the floral tube body (3-1) to the designed value; Step 8, close the air extraction valve (10), and let it stand until the floral tube body (3-1) is filled with water; Step 9, looping steps 7 and 8 until the water level in the flower tube body (3-1) reaches the required level; Step 10, open the air injection valve (11) and the drainage valve (9), and start the air compression pump (12); Step 11, looping steps 7, 8, 9 and 10 until the soft soil foundation reaches a preset effect.

9. The method for efficiently consolidating soft soil foundation by combining vacuum extraction and gas lift according to claim 8, characterized in that: The sealing membrane (4) is covered with a geotextile protective layer, and the edge of the sealing membrane (4) is sealed by a film pressing groove.

10. The method for efficiently consolidating soft soil foundation by combining vacuum extraction and gas lift according to claim 8, characterized in that: In step 7, the surface settlement and the vacuum degree under the membrane should be continuously tested.

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