Pipe pile foundation device for reinforcing soft ground and construction method thereof

Abstract

The application provides a pipe pile foundation device for reinforcing soft ground and a construction method thereof. The pipe pile foundation device comprises a pipe pile foundation and auxiliary equipment. The pipe pile foundation comprises an inner pipe, an outer pipe and a plurality of blades. The outer pipe is nested on the outer side of the inner pipe, and a cavity is formed between the outer pipe and the inner pipe. The side walls of the outer pipe and the inner pipe are each provided with a plurality of through holes communicating with the cavity. One end of each blade is hinged to the outer side wall of the outer pipe and can be flipped between specific angles. The auxiliary equipment comprises a cabin box and a vibration and impact linkage disc. The construction method comprises the following steps: 1) preparation, 2) vertical penetration, 3) drainage consolidation, 4) vibration and impact consolidation, blade unfolding, 5) chemical consolidation, and 6) cavity grouting. The device and method provided by the application can take into account the reinforcement effect of various soft soil consolidation methods, have a wide application range, and the pipe pile foundation after reinforcing the soft soil can be used as a foundation for engineering construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soft foundation treatment and single pile foundation construction, and particularly relates to a pipe pile foundation device for reinforcing a soft foundation and a construction method thereof. BACKGROUND

[0002] Large-diameter pipe pile foundation is a widely used foundation form in wind farms, which is suitable for various types of foundations, but cannot be directly applied to soft foundations. This is because the soil particles of the soft foundation are arranged loosely, the natural water content is large, the strength is low, the bearing capacity under external force is low, and the deformation is large. Therefore, the soft foundation needs to be reinforced to ensure that the bearing capacity of the foundation can meet the stability requirements, thereby ensuring the safe operation of the wind turbine.

[0003] A soft foundation refers to a foundation composed of silt, silt soil, part of the fill soil, miscellaneous fill soil or other high compressibility soil. At present, the main treatment methods for soft soil are composite foundation method, dynamic compaction method, drainage consolidation method, high-pressure jet grouting method and rolling method. The above foundation treatment methods can improve the strength and bearing capacity of the soil to a certain extent, but the treatment method is single and only limited to land foundation treatment. With the gradual development of offshore wind energy resources, it is necessary to reinforce and treat the soft soil under the water. The existing treatment method for soft soil on land cannot be directly and effectively applied to the reinforcement of soft soil under water, and there is a lack of an equipment and method that can simultaneously carry out foundation reinforcement and foundation construction and has high reliability in the prior art. SUMMARY

[0004] Therefore, the present application provides a pipe pile foundation device for reinforcing a soft foundation and a construction method thereof to solve the problems of the prior art.

[0005] According to an aspect of the present application, a pipe pile foundation device for reinforcing a soft foundation is provided, which comprises a pipe pile foundation and an auxiliary equipment detachably mounted on the pipe pile foundation.

[0006] The pipe pile foundation comprises an inner pipe, an outer pipe and a plurality of blades. The outer pipe is nested on the outer side of the inner pipe, and a cavity is formed between the outer pipe and the inner pipe. The first end of the outer pipe is sealingly connected to the first end of the inner pipe. The side wall of the outer pipe and the side wall of the inner pipe are both provided with a plurality of through holes communicating with the cavity. One end of each blade is hingedly mounted on the outer side wall of the outer pipe. Each blade can be flipped between a first position and a second position. When the blade is in the first position, the blade is parallel to the axis of the pipe pile foundation, and the other end of the blade faces the auxiliary equipment. When the blade is in the second position, the blade is inclined to the axis of the pipe pile foundation.

[0007] The auxiliary equipment comprises a cabin box and a vibration and flushing linkage disc, the vibration and flushing linkage disc is connected with the second end of the outer pipe and the second end of the inner pipe respectively, the cabin box is installed on the side of the vibration and flushing linkage disc away from the pipe pile foundation, and the vibration and flushing linkage disc is provided with a channel communicating the cabin box and the cavity.

[0008] In a possible implementation, the plurality of blades are divided into a plurality of blade groups, and the plurality of blade groups are arranged at intervals along the axial direction of the outer pipe.

[0009] Each blade group comprises a plurality of blades, and the plurality of blades of each blade group are uniformly arranged in the circumferential direction of the outer pipe.

[0010] In a possible implementation, the blades and the through holes are arranged alternately in the circumferential direction of the outer pipe.

[0011] In a possible implementation, the pipe pile foundation further comprises a ball seat arranged on the outer pipe, the ball seat comprises a fixed shell and a ball head, the fixed shell is a spherical shell provided with an opening, the fixed shell is provided with an accommodation cavity, the end of the blade is fixedly connected with the ball head, and the ball head is rotationally arranged in the accommodation cavity; the width of the blade is greater than the diameter of the ball head, and the part of the end of the blade that exceeds the diameter of the ball head in the width direction abuts at the position of the included angle between the opening wall surface of the fixed shell and the side wall of the outer pipe; when the blade is in the second position, the blade abuts against the opening wall surface.

[0012] In a possible implementation, the pipe pile foundation further comprises a tapered ring and a connecting ring, the outer edge of the tapered ring is connected with the first end of the outer pipe, and the inner edge is connected with the first end of the inner pipe, the outer edge of the connecting ring is connected with the second end of the outer pipe, and the inner edge is connected with the second end of the inner pipe, a plurality of hole positions are arranged on the connecting ring, the number of the channels is the same as the number of the hole positions, and one end of each channel corresponds to a respective hole position.

[0013] In a possible implementation, the side of the cabin box facing the vibration and flushing linkage disc is provided with a plurality of first openings, the number of the first openings is the same as the number of the channels, and the other end of each channel corresponds to a respective first opening.

[0014] In a possible implementation, the pipe pile foundation further comprises a plurality of filter screens, the plurality of filter screens are divided into two groups, one group of filter screens is installed on the inner pipe and covers the through holes on the inner pipe one by one, and the other group of filter screens is installed on the outer pipe and covers the through holes on the outer pipe one by one.

[0015] In a possible implementation, the auxiliary equipment further comprises a booster pump, a water pump and a switch valve, the booster pump and the switch valve are installed in the cabin box respectively, the cabin box is provided with a second opening for connecting a material conveying pipe, the water pump is installed inside the material conveying pipe, and the switch valve is configured to open or close the second opening.

[0016] In a possible implementation, the side of the vibration and impact linkage disc away from the cabin box is provided with an annular groove, and the second end of the tubular pile foundation extends into the annular groove and is detachably connected with the vibration and impact linkage disc.

[0017] According to another aspect of the embodiments of the present application, a construction method is provided for constructing the tubular pile foundation described above, and the construction method comprises:

[0018] 1) Preparation: providing a tubular pile foundation with a preset length and auxiliary equipment, and connecting the tubular pile foundation, the vibration and impact linkage disc and the external driving device and then placing them above the soft soil body to be penetrated, wherein the first end of the tubular pile foundation is adjacent to the surface of the soft soil body;

[0019] 2) Vertical penetration: moving the vibration and impact linkage disc and the tubular pile foundation vertically downward by the external driving device, so that the vibration and impact linkage disc and the tubular pile foundation penetrate into the soft soil body as a whole until the tubular pile foundation reaches a preset depth;

[0020] 3) Drainage consolidation: installing the cabin box on the vibration and impact linkage disc, and under the driving action of the water pump, the pore water in the soft soil body enters the cavity through the through hole, enters the cabin box through the channel, and is finally discharged from the material conveying pipe until the drainage consolidation requirement is met, wherein the cabin box is connected to the external material device through the material conveying pipe, and the water pump is installed inside the material conveying pipe;

[0021] 4) Vibration and impact consolidation and leaf unfolding: removing the cabin box, and controlling the vibration and impact linkage disc to generate vibration, so that the vibration and impact linkage disc drives the tubular pile foundation to vibrate, and the soil particles around the tubular pile foundation are rearranged and compacted; each leaf blade is flipped from the first position to the second position under the vibration of the tubular pile foundation;

[0022] 5) Chemical consolidation: installing the cabin box on the vibration and impact linkage disc, and introducing a consolidating agent into the cabin box by using the external material device, the consolidating agent enters the soft soil body through the through hole in the cavity and produces chemical consolidation with the soft soil;

[0023] 6) Tubular pile foundation cavity grouting: introducing grouting slurry into the cabin box by using the external material device, the grouting slurry enters the cavity through the cabin box and the channel until the cavity is completely filled with the grouting slurry, and the grouting slurry in the cavity blocks the through hole, so that the tubular pile foundation forms a solid structure.

[0024] The present application has the following beneficial effects:

[0025] 1. The tubular pile foundation device for reinforcing soft foundation and the construction method thereof provided by the present application can effectively combine various soft foundation treatment methods to superimpose the effect of foundation reinforcement, and solve the problem of low bearing capacity of the tubular pile foundation in soft soil by improving the strength of the soil;

[0026] 2. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application can form a solid structure by grouting into the pipe pile foundation cavity after reinforcing the soft soil, thereby increasing the overall strength and rigidity of the pipe pile foundation, and enabling the pipe pile foundation to be used as a foundation in engineering construction.

[0027] 3. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application can adopt the drainage consolidation method, connect the cabin box with the material conveying pipe, install a water pump in the material conveying pipe, and under the driving of the water pump, the pore water in the soft soil around the pipe pile foundation enters the cavity through the through holes on the inner pipe and the outer pipe, enters the cabin box through the channel, and is finally discharged from the material conveying pipe. The water content of the soft soil around the pipe pile foundation can be effectively reduced, the soft soil is fully consolidated, the soil density is increased, and the overall strength of the soil is improved.

[0028] 4. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application can adopt the vibration consolidation method, and by applying vibration to the pipe pile foundation, on the one hand, the blades of the pipe pile foundation are turned from the first position to the second position, the side friction between the pipe pile foundation and the surrounding soil is increased, and the uplift resistance of the pipe pile foundation is improved; on the other hand, the soil particles around the pipe pile foundation are rearranged, the soil density of the soft soil is increased by changing the internal structure of the soil, and the overall strength of the soil is improved.

[0029] 5. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application can adopt the chemical consolidation method, and by adding a consolidating agent to the cabin box through the material conveying pipe, the consolidating agent enters the cavity of the pipe pile foundation through the channel, and then enters the soil through the through holes of the inner pipe and the outer pipe. The consolidating agent reacts with the soft soil, the soil around the pipe pile foundation is chemically consolidated, and the overall strength of the soil is improved.

[0030] 6. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application has strong adaptability, and different lengths and diameters of pipe pile foundations can be customized and selected according to the depth of the soft soil to adapt to soft soil of different depths.

[0031] 7. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application has a wide application range, and is not only suitable for reinforcing soft foundation on land, but also suitable for reinforcing soft soil such as seabed and riverbed.

[0032] 8. The pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the application are simple to operate, the auxiliary equipment can be repeatedly used, and have high flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0034] Figure 1 The structural schematic diagram of the pipe pile foundation and auxiliary equipment provided by the embodiments of the present application is shown in the figure.

[0035] Figure 2 The structural schematic diagram of the pipe pile foundation provided by the embodiments of the present application is shown in the figure.

[0036] Figure 3 The oblique sectional schematic diagram of the pipe pile foundation provided by the embodiments of the present application is shown in the figure.

[0037] Figure 4 The longitudinal sectional schematic diagram of the pipe pile foundation provided by the embodiments of the present application is shown in the figure.

[0038] Figure 5 The longitudinal sectional schematic diagram of the pipe pile foundation and auxiliary equipment provided by the embodiments of the present application is shown in the figure.

[0039] Figure 6 The schematic diagram of the connection mode of the blade and the outer pipe provided by the embodiments of the present application is shown in the figure.

[0040] Figure 7 The schematic diagram of the vibration and percussion linkage plate facing one side of the pipe pile provided by the embodiments of the present application is shown in the figure.

[0041] Figure 8 The schematic diagram of the pipe pile foundation operation preparation process provided by the embodiments of the present application is shown in the figure.

[0042] Figure 9 The schematic diagram of the pipe pile foundation vertical down-penetration process provided by the embodiments of the present application is shown in the figure.

[0043] Figure 10 The schematic diagram of the pipe pile foundation drainage consolidation process provided by the embodiments of the present application is shown in the figure.

[0044] Figure 11 The schematic diagram of the pipe pile foundation vibration and consolidation, and blade unfolding provided by the embodiments of the present application is shown in the figure.

[0045] Figure 12 The schematic diagram of the pipe pile foundation chemical consolidation provided by the embodiments of the present application is shown in the figure.

[0046] Figure 13 The side schematic diagram of the pipe pile foundation reinforcement range of soil provided by the embodiments of the present application is shown in the figure.

[0047] Figure 14A plan view of a soil body reinforcement range of a pipe pile foundation provided by an embodiment of the present application;

[0048] Figure 15 A schematic view of a soil body reinforced by a pipe pile foundation provided by an embodiment of the present application.

[0049] Legend of reference signs:

[0050] 100-pipe pile foundation; 110-inner pipe; 120-outer pipe; 130-cavity; 140-through hole; 150-blade; 160-conical ring; 170-connection ring; 171-hole site; 180-filter screen; 190-ball seat; 191-fixed housing; 1911-opening; 1912-opening wall surface; 192-ball head;

[0051] 200-accessory equipment; 210-cabin box; 211-first opening; 212-second opening; 220-vibration and percussion linkage plate; 221-channel; 222-connection part; 223-annular groove; 230-pressure booster pump; 240-on-off valve;

[0052] 300-conveying pipe;

[0053] 400-external driving equipment;

[0054] 500-water suction pump;

[0055] 600-external material device;

[0056] 710-soil body; 720-solidification agent; 730-grouting slurry;

[0057] 800-reinforcement range line. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0059] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, it can also be indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0060] In the description of the application, it is necessary to understand that the terms "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0061] The terms "first", "second", "third" (if any) in the specification and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0062] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0063] At present, the treatment method for soft soil is limited to land foundation treatment, and cannot be directly and effectively applied to the reinforcement of soft soil below water surface, and there is a lack of an equipment and method which can simultaneously carry out foundation reinforcement and infrastructure construction and has high reliability in the prior art.

[0064] After repeated thinking and verification, the present inventors found that if a pipe pile foundation device for reinforcing soft soil is provided, the pipe pile foundation device comprises a pipe pile foundation and auxiliary equipment detachably mounted on the pipe pile foundation, the pipe pile foundation can consolidate the soft soil around the pipe pile foundation by various consolidation methods after penetrating into the soft soil, and the effect of foundation reinforcement is good and the reliability is high. The pipe pile foundation device is not only suitable for soft foundation on land, but also suitable for reinforcement of soft soil such as seabed and riverbed. The pipe pile foundation after reinforcing the soft soil can be used as a foundation for engineering construction.

[0065] In view of this, the present application designs a pipe pile foundation device for reinforcing soft foundation and a construction method thereof. By cooperation of the cabin box, the pipe pile foundation and other equipment, pore water in the soft soil can be extracted and consolidating agent can be introduced into the soft soil, so as to realize drainage consolidation and chemical consolidation of the soft soil. The vibration linkage disc can drive the pipe pile foundation to vibrate, so as to realize reinforcement of the soft soil around the pipe pile foundation by vibration consolidation. When vibration consolidation is performed, the blades are opened under the vibration of the pipe pile foundation, so as to improve the uplift resistance of the pipe pile foundation. The cabin box can also grout the cavity of the pipe pile foundation. After the grouting slurry fills the cavity of the pipe pile foundation and consolidates, the overall strength and stiffness of the pipe pile foundation are improved, so as to ensure that the pipe pile foundation meets the requirements of infrastructure construction.

[0066] The technical solutions of the pipe pile foundation device for reinforcing soft foundation and the construction method thereof provided by the embodiments of the present application are described in detail below with reference to the drawings.

[0067] Referring to Figures 1-5 As shown in the drawings, the pipe pile foundation device for reinforcing soft foundation provided by the embodiments of the present application comprises a pipe pile foundation 100 and auxiliary equipment 200 detachably installed on the pipe pile foundation 100. The pipe pile foundation 100 comprises an inner pipe 110, an outer pipe 120 and a plurality of blades 150. The outer pipe 120 is nested on the outer side of the inner pipe 110, and a cavity 130 is formed between the outer pipe 120 and the inner pipe 110. The first end of the outer pipe 120 is sealingly connected to the first end of the inner pipe 110, and the side wall of the outer pipe 120 and the side wall of the inner pipe 110 are both provided with a plurality of through holes 140 communicating with the cavity 130. One end of each blade 150 is hingedly installed on the outer side wall of the outer pipe 120, and each blade 150 can be flipped between a first position and a second position. When the blade 150 is located at the first position, the blade 150 is parallel to the axis of the pipe pile foundation 100, and the other end of the blade 150 faces the auxiliary equipment 200. When the blade 150 is located at the second position, the blade 150 is inclined to the axis of the pipe pile foundation 100. The auxiliary equipment 200 comprises a cabin box 210 and a vibration and percussion linkage disc 220. The vibration and percussion linkage disc 220 is connected to the second end of the outer pipe 120 and the second end of the inner pipe 110 respectively, the cabin box 210 is installed on the side of the vibration and percussion linkage disc 220 away from the pipe pile foundation 100, and the vibration and percussion linkage disc 220 is provided with a passage 221 communicating the cabin box 210 with the cavity 130.

[0068] The auxiliary device 200 can be repeatedly used and has high flexibility. Specifically, the auxiliary device 200 can be connected to the pipe pile foundation 100 and penetrated into the soft soil. After the soft soil is reinforced, the auxiliary device 200 can be detached from the pipe pile foundation 100 and installed on another pipe pile foundation 100 to reinforce the soft soil at another position. The auxiliary device 200 can be detachably connected to the pipe pile foundation 100 by fastening or clamping, which is not limited herein.

[0069] It can be understood that the diameter and depth of the pipe pile foundation 100 can be selected according to the depth of the soft soil. Specifically, the cross sections of the inner pipe 110 and the outer pipe 120 are both thin-walled circular pipes, and the inner diameter of the outer pipe 120 is greater than the inner diameter of the inner pipe 110. The ratio between the outer diameter of the inner pipe 110 and the outer diameter of the outer pipe 120 can be 1:1.1-1:1.3. The specific ratio between the outer diameter of the inner pipe 110 and the outer diameter of the outer pipe 120 can be set according to actual needs, which is not limited herein. It is worth mentioning that the sealing connection between the first end of the outer pipe 120 and the first end of the inner pipe 110 can prevent the soil from entering the cavity 130 between the inner pipe 110 and the outer pipe 120 during the penetration of the pipe pile foundation 100.

[0070] Specifically, the diameter of the through hole 140 can be 5-20 cm. In one possible implementation, the plurality of through holes 140 on the inner pipe 110 are divided into a plurality of first through hole groups, and the plurality of through holes 140 on the outer pipe 120 are divided into a plurality of second through hole groups. The plurality of first through hole groups are arranged along the axial direction of the inner pipe 110, and the plurality of second through hole groups are arranged along the axial direction of the outer pipe 120. Each first through hole group includes four or more through holes 140, and the plurality of through holes 140 in each first through hole group can be uniformly arranged along the circumferential direction of the inner pipe 110. Each second through hole group includes four or more through holes 140, and the plurality of through holes 140 in each second through hole group can be uniformly arranged along the circumferential direction of the outer pipe 120. The above arrangement can ensure the uniformity of the pipe pile foundation 100 in reinforcing the surrounding soil.

[0071] Specifically, as shown in Figure 1 The passage 221 penetrates the vibration and percussion linkage disc 220 along the thickness direction of the vibration and percussion linkage disc 220. The pore water in the cavity 130 of the pipe pile foundation 100 can enter the inside of the cabin box 210 through the passage 221 of the vibration and percussion linkage disc 220, and the fluid in the cabin box 210 can enter the cavity 130 of the pipe pile foundation 100 through the passage 221. As shown in Figure 1 and Figure 5As shown, in a possible implementation, the vibration and impact linkage plate 220 is provided with a connecting portion 222, which can be a rod-shaped structure, the axis of the rod-shaped structure being perpendicular to the axis of the tubular pile foundation 100. The vibration and impact linkage plate 220 can be connected to an external driving device 400 through the connecting portion 222, and the external driving device 400 can drive the vibration and impact linkage plate 220 and the tubular pile foundation 100 to penetrate into the soft soil. In a possible implementation, the external driving device 400 can also drive the vibration and impact linkage plate 220 to vibrate, and further drive the tubular pile foundation 100 to vibrate. In another possible implementation, the vibration and impact linkage plate 220 is provided with a vibration portion, which is electrically connected to the external driving device 400, and the external driving device 400 supplies power to the vibration portion, so that the vibration and impact linkage plate 220 vibrates.

[0072] It should be noted that the first position is the position of the blade 150 when the blade 150 is not opened, and the angle between the blade 150 and the axis of the tubular pile foundation 100 is smallest; and the second position is the position of the blade 150 when the blade 150 is fully opened, and the angle between the blade 150 and the axis of the tubular pile foundation 100 is largest.

[0073] Each blade 150 can be made of a metal material to ensure that the blade 150 has sufficient rigidity and bending resistance. The specific number of blades 150 is not limited in this embodiment, and can be set according to actual needs by those skilled in the art.

[0074] Illustratively, an end of each blade 150 away from the hinge point can be arc-shaped, and the curvature thereof can match the outer side wall of the outer tube 120. When the blade 150 is in the second position, the angle between the blade 150 and the axis of the outer tube 120 can be 30°-60°, for example, when the blade 150 is in the second position, the angle between the blade 150 and the axis of the outer tube 120 can be 45°.

[0075] When the tubular pile foundation 100 penetrates into the soft soil, each blade 150 is in the first position, and the other end of the blade 150 is vertically upward, so that the tubular pile foundation 100 can smoothly penetrate. After the soft soil around the tubular pile foundation 100 is drained and consolidated, the vibration and impact linkage plate 220 drives the tubular pile foundation 100 to vibrate, and the soil particles around the tubular pile foundation 100 are rearranged under the action of vibration. Each blade 150 is opened under the action of the vibration of the tubular pile foundation 100 and the soil on the upper part of the blade 150, the other end of the blade 150 moves away from the tubular pile foundation 100, each blade 150 flips from the first position to the second position, and when the blade 150 is in the second position, the soil on the upper part of the blade 150 falls down and fills the gap, and the blade 150 is stabilized in the second position under the extrusion and compaction of the soil.

[0076] The pipe pile foundation device for reinforcing soft ground provided by the embodiment of the present application has the beneficial effects that: when the pipe pile foundation 100 penetrates into the soft soil body to a preset depth, the soft soil body 710 around the pipe pile foundation 100 can be drained and consolidated, the cabin box 210 is connected with the material conveying pipe 300, under the driving of the water pump 500 in the material conveying pipe 300, the pore water in the soft soil body 710 around the pipe pile foundation 100 enters the cavity 130 through the through hole 140, enters the cabin box 210 through the channel 221, and is finally discharged from the material conveying pipe 300, so as to reduce the water content of the soft soil body 710 around the pipe pile foundation 100, fully consolidate the soft soil, increase the compactness of the soil body 710, and thus improve the overall strength of the soil body 710. After the drainage and consolidation, the vibration and percussion linkage disc 220 can drive the pipe pile foundation 100 to vibrate, on the one hand, the pipe pile foundation 100 drives each blade 150 to flip from the first position to the second position, the side friction between the pipe pile foundation 100 and the surrounding soil is increased by using the blade 150, and the uplift resistance of the pipe pile foundation 100 is improved; on the other hand, the soil particles around the pipe pile foundation 100 are rearranged, the compactness of the soft soil body is increased by changing the internal structure of the soil, the overall strength of the soil is improved, the soft soil body is reinforced, and the vibration and consolidation of the soft soil body are realized. After the vibration and consolidation, the consolidation agent is added to the cabin box 210 through the material conveying pipe 300, the consolidation agent enters the cavity 130 of the pipe pile foundation 100 through the channel 221, and then enters the soil body 710 through the through hole 140 of the inner and outer pipes 120, the consolidation agent reacts with the soft soil body 710, the soil body 710 around the pipe pile foundation 100 is chemically consolidated, and the overall strength of the soil body 710 is improved.

[0077] After the soft soil body is consolidated, the cavity 130 can be grouted, and the grouting slurry is consolidated to form a solid structure of the pipe pile foundation 100, improve the overall strength and rigidity of the pipe pile foundation 100, and the solid pipe pile foundation 100 can be used as a foundation for foundation construction. In summary, the pipe pile foundation device provided by the present application can reinforce the soft soil body by multiple consolidation methods, the effects of the multiple consolidation methods are superimposed, the strength of the soft soil body is increased, and the reliability is high.

[0078] The pipe pile foundation device is not only suitable for land soft ground, but also suitable for the reinforcement and foundation construction of soft soil bodies such as seabed and riverbed.

[0079] In addition, the pipe pile foundation device provided by the embodiment can customize and select pipe pile foundations 100 with different lengths and diameters according to different depths of soft soil bodies, so as to adapt to the reinforcement of soft soil bodies with different depths and have high adaptability. The pipe pile foundation device provided by the embodiment is convenient for construction, and the auxiliary equipment 200 can be repeatedly used and has high flexibility.

[0080] It is worth mentioning that the type of consolidating agent can be selected according to the type of soft soil. In this embodiment, the consolidating agent can be in liquid state, or a solid consolidating agent can be dissolved in a solvent for use.

[0081] In one embodiment, such as Figure 1 and Figure 2 As shown, multiple blades 150 are divided into multiple blade groups, and the multiple blade groups are arranged at intervals along the axial direction of the outer tube 120. Each blade group includes multiple blades 150, and the multiple blades 150 of each blade group are evenly arranged along the circumference of the outer tube 120.

[0082] Understandably, each blade group is arranged around the outer pipe 120, and each blade group may include four or more blades 150. After the pipe pile foundation 100 penetrates into the soft soil, the multiple blade groups correspond to different depth positions in the soil. Schematic, on the outer pipe 120, the blade groups and their adjacent second through-hole groups form blade through-hole units. Multiple blade through-hole units are arranged at intervals along the axial direction of the outer pipe 120. For example, the distance between adjacent blade through-hole units can be 8-10m to maintain the overall stability of the pipe pile foundation 100.

[0083] The above settings can ensure the pull-out resistance of the pipe pile foundation 100, that is, the pipe pile foundation 100 is subjected to uniform stress at different depths in the soil and at different positions in its circumference, and all have high pull-out resistance.

[0084] In one possible implementation, such as Figure 1 and Figure 2 As shown, the blades 150 and the through holes 140 are arranged alternately in the circumferential direction of the outer tube 120.

[0085] It is worth mentioning that the number of blades 150 in each blade through-hole unit is the same as the number of through-holes 140. For example, as shown in the figure, the blade through-hole unit includes four blades 150 and four through-holes 140. When the blades 150 are in the second position and the consolidating agent is sprayed into the through-holes 140, the consolidating agent and the blades 150 form an approximate "rice" shaped structure around the pipe pile foundation 100.

[0086] The above settings can ensure that the pipe pile foundation 100 is subjected to uniform stress in the soil, and ensure that the pipe pile foundation 100 will not tilt when used as a foundation.

[0087] In one possible implementation, such as Figure 3 , Figure 4 and Figure 6As shown, the tubular pile foundation 100 further comprises a ball seat 190 arranged on the outer tube 120, the ball seat 190 comprising a fixed shell 191 and a ball head 192. The fixed shell 191 is a spherical shell provided with an opening 1911, and the fixed shell 191 is provided with an accommodating cavity. The end of the blade 150 is fixedly connected with the ball head 192, and the ball head 192 is rotationally arranged inside the accommodating cavity. The width of the blade 150 is greater than the diameter of the ball head 192, and the part of the end of the blade 150 that exceeds the diameter of the ball head 192 in the width direction abuts at the position of the included angle between the opening wall surface 1912 of the fixed shell 191 and the side wall of the outer tube 120; when the blade 150 is in the second position, the blade 150 abuts against the opening wall surface 1912.

[0088] The fixed shell 191 can be arranged on the outer tube 120 by integral molding or welding, which is not limited herein. It can be understood that the shape of the accommodating cavity is spherical, the size of the ball head 192 matches the size of the accommodating cavity, and the ball head 192 can rotate in the accommodating cavity. The blade 150 can be flipped between the first position and the second position in the direction of the arrow. Figure 6 The part of the blade 150 that exceeds the ball head 192 in the width direction abuts at the position of the included angle between the opening wall surface 1912 and the side wall of the outer tube 120, which can limit the degree of freedom of the ball head 192, so that the blade 150 can only be flipped between the first position and the second position. It can be understood that when the blade 150 is in the second position, the opening wall surface 1912 can limit the blade 150 from further flipping outward, and at this time, the blade 150 has the maximum included angle with the axis of the tubular pile foundation 100.

[0089] Through the above arrangement, the blade 150 can rotate relative to the outer tube 120, and the degree of freedom of the blade 150 can be limited, so that the blade 150 can only be flipped between the first position and the second position. The abutment of the opening wall surface 1912 and the blade 150 can also limit the maximum opening angle of the blade 150. In addition, the ball head 192 can also prevent the soil from entering the accommodating cavity and hindering the opening of the blade 150.

[0090] In one embodiment, as shown in Figure 2 and Figure 4 The tubular pile foundation 100 further comprises a conical ring 160 and a connecting ring 170, the outer edge of the conical ring 160 is connected with the first end of the outer tube 120, and the inner edge is connected with the first end of the inner tube 110, the outer edge of the connecting ring 170 is connected with the second end of the outer tube 120, and the inner edge is connected with the second end of the inner tube 110, the connecting ring 170 is provided with a plurality of hole positions 171, the number of channels 221 is the same as the number of hole positions 171, and one end of each channel 221 corresponds to the corresponding hole position 171.

[0091] The first end of the inner tube 110 is beyond the first end of the outer tube 120, the inner diameter of the conical ring 160 matches the radius of the inner tube 110, the outer diameter of the conical ring 160 matches the radius of the outer tube 120, and the conical ring 160 is sealingly connected to the inner tube 110 and the outer tube 120 by welding. The specific length of the part of the inner tube 110 beyond the outer tube 120 is not limited, and a person skilled in the art can set it according to the needs.

[0092] The second end of the inner tube 110 is flush with the second end of the outer tube 120, the inner diameter of the connecting ring 170 matches the radius of the inner tube 110, the outer diameter of the connecting ring 170 matches the radius of the outer tube 120, and the connecting ring 170 is sealingly connected to the inner tube 110 and the outer tube 120 by welding. The number of hole positions 171 is not limited, for example, three, four or five, and a plurality of hole positions 171 can be arranged in a ring array on the connecting ring 170. The number of channels 221 can be set according to the number of hole positions 171. The bottom end of each channel 221 communicates with the corresponding hole position 171.

[0093] In this embodiment, the conical ring 160 and the connecting ring 170 can ensure the structural stability of the tubular pile foundation 100. The first end of the inner tube 110 and the first end of the outer tube 120 are connected by the conical ring 160, which can reduce the resistance when the tubular pile foundation 100 penetrates into the soil, and facilitate the penetration of the tubular pile foundation 100 into the soil. The hole positions 171 are arranged on the connecting ring 170 to communicate the channels 221 of the vibration and percussion linkage disc 220 with the cavity 130 of the tubular pile foundation 100.

[0094] In one embodiment, as shown in Figure 5 The side of the cabin box 210 facing the vibration and percussion linkage disc 220 is provided with a plurality of first openings 211. The number of first openings 211 is the same as the number of channels 221, and the other end of each channel 221 corresponds to the corresponding first opening 211. Specifically, the top end of each channel 221 communicates with the corresponding first opening 211.

[0095] Through the above arrangement, the cabin box 210 can communicate with the cavity 130 of the tubular pile foundation 100, so that the pore water in the soft soil can enter the cabin box 210 through the cavity 130, and the fluid material in the cabin box 210 can enter the cavity 130 of the tubular pile foundation 100.

[0096] As shown in Figure 3 and Figure 4As shown, in one possible implementation, the pipe pile foundation 100 further comprises a plurality of filter screens 180, which are divided into two groups, one group of filter screens 180 is installed on the inner pipe 110 and covers the through holes 140 on the inner pipe 110 one by one, and the other group of filter screens 180 is installed on the outer pipe 120 and covers the through holes 140 on the outer pipe 120 one by one.

[0097] For example, the filter screens 180 on the inner pipe 110 are installed on the inner circumferential surface of the inner pipe 110, and the plurality of filter screens 180 cover the plurality of through holes 140 on the inner pipe 110 one by one, and the filter screens 180 can be fixed on the inner pipe 110 by welding, bonding or other suitable methods. The filter screens 180 on the outer pipe 120 are installed on the outer circumferential surface of the outer pipe 120, and the plurality of filter screens 180 cover the plurality of through holes 140 on the outer pipe 120 one by one, and the filter screens 180 can be fixed on the outer pipe 120 by welding, bonding or other suitable methods.

[0098] By setting the filter screens 180, the soil can be prevented from entering the cavity 130 of the pipe pile foundation 100 and blocking the cavity 130.

[0099] In one embodiment, as shown, Figure 5 The auxiliary device 200 further comprises a booster pump 230, a water pump 500 and a switch valve 240. The booster pump 230 and the switch valve 240 are installed in the cabin box 210, the cabin box 210 is provided with a second opening hole 212 for connecting the material conveying pipe 300, the water pump 500 is installed inside the material conveying pipe 300, and the switch valve 240 is configured to open or close the second opening hole 212.

[0100] Figure 5 As shown, the second opening hole 212 can be arranged at the top of the cabin box 210. It can be understood that when the cabin box 210 is connected with the material conveying pipe 300, the pore water in the soft soil can be discharged through the cavity 130, the cabin box 210 and the material conveying pipe 300 under the driving action of the water pump 500. When the water pump 500 is reversed, the fluid material can enter the cabin box 210 from the material conveying pipe 300 and enter the cavity 130 from the cabin box 210. The switch valve 240 can be a ball valve, an electric valve or a solenoid valve, which is not limited herein.

[0101] In this embodiment, the cabin box 210 can be connected to the feeding pipe 300 through the second opening 212, and under the driving action of the water pump 500, the pore water in the soft soil around the pipe pile foundation 100 can be discharged, and the fluid material can be introduced into the cavity 130. The on-off valve 240 can control the communication state between the second opening 212 and the feeding pipe 300. When the fluid material is a solidifying agent, after the solidifying agent enters the cabin box 210, the booster pump 230 can pressurize the solidifying agent to ensure that the solidifying agent can enter the soil around the pipe pile foundation 100 through the cavity 130 and the through hole 140 of the pipe pile foundation 100.

[0102] In one embodiment, as shown in Figure 5 and Figure 7 The side of the vibration and percussion linkage plate 220 away from the cabin box 210 is provided with an annular groove 223, and the second end of the pipe pile foundation 100 extends into the annular groove 223 and is detachably connected with the vibration and percussion linkage plate 220.

[0103] The annular groove 223 is located at the bottom end of the vibration and percussion linkage plate 220, and the top end of the pipe pile foundation 100 extends into the annular groove 223 and is detachably connected with the vibration and percussion linkage plate 220. It can be understood that the size of the annular groove 223 is adapted to the cross-sectional size of the pipe pile foundation 100. The depth of the annular groove 223 can be set as needed, which is not limited herein. After the end of the pipe pile foundation 100 extends into the annular groove 223, it can be fixed with the vibration and percussion linkage plate 220 by bolts or mortise and tenon, which is not limited herein.

[0104] By providing the annular groove 223 on the vibration and percussion linkage plate 220, the rapid positioning between the vibration and percussion linkage plate 220 and the pipe pile foundation 100 can be achieved, the connection accuracy between the vibration and percussion linkage plate 220 and the pipe pile foundation 100 is improved, and the cavity 130 of the pipe pile foundation 100 is facilitated to communicate with the cabin box 210.

[0105] In a possible implementation, the pipe pile foundation 100 further comprises a plurality of support rods connected between the inner pipe 110 and the outer pipe 120, one end of the support rod is fixedly connected with the outer side wall of the inner pipe 110, and the other end of the support rod is fixedly connected with the inner side wall of the outer pipe 120.

[0106] The support rod can be fixed with the inner pipe 110 and the outer pipe 120 by welding. The specific number and installation position of the support rod are subject to the condition that the fluid material can flow in the cavity 130 of the pipe pile foundation 100, which is not limited herein. By providing the support rod, the structural strength of the pipe pile foundation 100 can be improved, and the bending resistance of the pipe pile foundation 100 can be improved.

[0107] On the basis of the above-mentioned embodiments, the application further provides a construction method for the construction of the pipe pile foundation provided in any of the above-mentioned embodiments. The construction method comprises:

[0108] 1) Preparation: as shown in the figure, a pipe pile foundation 100 with a preset length and auxiliary equipment 200 are provided, and the pipe pile foundation 100, the vibration and percussion linkage disc 220 and the external driving equipment 400 are connected and placed above the soft soil body 710 to be penetrated, wherein the first end of the pipe pile foundation 100, i.e. the bottom end of the pipe pile foundation 100, is close to the surface of the soft soil body 710; Figure 8

[0109] The length of the pipe pile foundation 100 can be set according to the depth of penetration into the soft soil body 710, and the auxiliary equipment 200 is matched in size with the pipe pile foundation 100. When the pipe pile foundation 100 is located above the soft soil body 710 to be penetrated, the axis of the pipe pile foundation 100 extends in the vertical direction.

[0110] 2) Vertical penetration: as shown in the figure, the vibration and percussion linkage disc 220 and the pipe pile foundation 100 are moved vertically downward by the external driving equipment 400 to make the vibration and percussion linkage disc 220 and the pipe pile foundation 100 penetrate into the soft soil body 710 as a whole until the pipe pile foundation 100 reaches the preset depth. Figure 9

[0111] Specifically, the external driving equipment 400 can be started, and then the external driving equipment 400 can drive the vibration and percussion linkage disc 220 and the pipe pile foundation 100 to penetrate as a whole.

[0112] 3) Drainage consolidation: as shown in the figure, the cabin box 210 is installed on the vibration and percussion linkage disc 220, and under the driving action of the water pump 500, the pore water in the soft soil body 710 enters the cavity 130 through the through hole 140, enters the cabin box 210 after passing through the channel 221, and is finally discharged from the material conveying pipe 300 until the drainage consolidation requirement is met, wherein the cabin box 210 is connected to the external material device 600 through the material conveying pipe 300, and the water pump 500 is installed inside the material conveying pipe 300; Figure 10 Under the action of the water pump 500, a negative pressure is formed in the cavity 130 of the pipe pile foundation 100. When the filter screen 180 is arranged on the inner tube 110 and the outer tube 120 respectively, the pore water in the soft soil body 710 can pass through the filter screen 180 in the direction of the arrow, enter the cavity 130 of the pipe pile foundation 100 from the through hole 140, and flow vertically upward along the cavity 130 and into the cabin box 210 through the channel 221, and finally be discharged from the material conveying pipe 300. The above-mentioned setting reduces the water content of the soft soil body 710 around the pipe pile foundation 100, so that the soft soil body 710 is fully consolidated.

[0113] Figure 10 ​​​​

[0114] 4) Vibration consolidation, leaf unfolding: as shown in FIG. 4, remove the chamber box 210, and control the vibration of the vibration linkage plate 220 to make the vibration linkage plate 220 drive the pipe pile foundation 100 to vibrate, and the particles of the soil 710 around the pipe pile foundation 100 are rearranged and compacted; each leaf blade 150 is flipped from the first position to the second position under the vibration of the pipe pile foundation 100. Figure 11 When the pipe pile foundation 100 is vibrating, the other end of each leaf blade 150 moves away from the pipe pile foundation 100 under the action of vibration, that is, the leaf blade 150 is flipped from the first position to the second position under the action of vibration, and when the leaf blade 150 is flipped in place, the soil 710 above the leaf blade 150 falls down and fills the gap, and the leaf blade 150 is stationary and stable under the extrusion and compaction of the soil 710. When the leaf blade 150 is flipped in place, the side friction between the pipe pile foundation 100 and the surrounding soil 710 can be increased, and the uplift resistance of the pipe pile foundation 100 is improved. The particles of the soil 710 around the pipe pile foundation 100 are rearranged under the vibration, the density of the soft soil 710 is increased by changing the internal structure of the soil 710, and the overall strength of the soil 710 is improved.

[0115] 5) Chemical consolidation: as shown in FIG. 5, install the chamber box 210 on the vibration linkage plate 220, and use the external material device 600 to pass the consolidating agent 720 into the chamber box 210, the consolidating agent 720 enters the cavity 130 through the channel 221, and the consolidating agent 720 in the cavity 130 enters the soft soil 710 through the through holes 140 and generates chemical consolidation with the soft soil.

[0116] Figure 12 Specifically, the on-off valve 240 and the water pump 500 are opened, at this time, the water pump 500 is operated in reverse, the consolidating agent 720 enters the chamber box 210 from the external material device 600, the booster pump 230 boosts the consolidating agent 720 in the chamber box 210, the consolidated agent 720 after boosting enters the soft soil 710 through the cavity 130 and the through holes 140 of the pipe pile foundation 100, and the consolidating agent 720 reacts with the soft soil 710 to realize the chemical consolidation of the soft soil 710 and enhance the strength of the soft soil 710.

[0117] 6) Grouting of the cavity 130 of the pipe pile foundation 100: pass the grouting slurry 730 into the chamber box 210 through the external material device 600, the grouting slurry 730 enters the cavity 130 through the chamber box 210 and the channel 221 until the cavity 130 is completely filled with the grouting slurry 730, and the grouting slurry 730 in the cavity 130 blocks the through holes 140, so that the pipe pile foundation 100 forms a solid structure.

[0118] 6) Grouting of the cavity 130 of the pipe pile foundation 100: pass the grouting slurry 730 into the chamber box 210 through the external material device 600, the grouting slurry 730 enters the cavity 130 through the chamber box 210 and the channel 221 until the cavity 130 is completely filled with the grouting slurry 730, and the grouting slurry 730 in the cavity 130 blocks the through holes 140, so that the pipe pile foundation 100 forms a solid structure.

[0119] ​For example, the grouting slurry 730 can enter the cabin box 210 under the action of the water pump 500 and finally enter the cavity 130. Cement can be used as the grouting slurry 730, and when the filter screen 180 is arranged on the inner tube 110 and the outer tube 120 respectively, the grouting slurry 730 can block the filter screen 180. Specifically, the particle size of the grouting slurry 730 is greater than the mesh size of the filter screen 180, thereby plugging the through hole 140 of the pipe pile foundation 100. After the cement is solidified in the cavity 130, the pipe pile foundation 100 forms a solid structure, improving the overall strength and stiffness of the pipe pile foundation 100.

[0120] It is worth mentioning that after the pipe pile foundation 100 is constructed, the auxiliary equipment 200 can be moved to another pipe pile foundation 100 and connected with the pipe pile foundation 100, and the soft soil 710 at another position is reinforced by using the pipe pile foundation 100.

[0121] Figure 13 And Figure 14 It is shown that after the above construction steps, the part of the soil 710 inside the reinforcement range line 800 is effectively solidified by the pipe pile foundation 100. As Figure 15 shown, after the grouting slurry 730 is solidified in the pipe pile foundation 100, the structural strength of the pipe pile foundation 100 can meet the requirements of the foundation.

[0122] It is worth mentioning that when the soft soil 710 is drained and solidified, when the filter screen 180 is arranged on the inner tube 110 and the outer tube 120 respectively and the soil 710 blocks the filter screen 180, so that the pore water in the soft soil 710 cannot be normally discharged, the water pump 500 can be controlled to operate in reverse. At this time, the liquid in the cavity 130 is discharged outward through the filter screen 180, and the reverse flow of the liquid washes the filter screen 180, ensuring the soil filtering and water permeability function of the filter screen 180.

[0123] This structure, using the above construction method to construct the pipe pile foundation, can solidify the soft soil 710 in multiple ways, increase the strength of the soft soil 710, and has high reliability. By grouting into the cavity 130 of the pipe pile foundation 100, the overall strength and stiffness of the pipe pile foundation 100 are ensured, so that the structure of the pipe pile foundation 100 is more firm and reliable, and the pipe pile foundation 100 meets the requirements of the foundation.

[0124] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pipe pile foundation device for reinforcing soft soil foundations, characterized in that, The pipe pile foundation and auxiliary equipment detachably mounted on the pipe pile foundation are included; The pipe pile foundation includes an inner pipe, an outer pipe and a plurality of blades, the outer pipe is nested on the outside of the inner pipe, a cavity is formed between the outer pipe and the inner pipe, the first end of the outer pipe is sealingly connected with the first end of the inner pipe, the side wall of the outer pipe and the side wall of the inner pipe are both provided with a plurality of through holes communicating with the cavity; one end of each of the blades is hingedly mounted on the outside wall of the outer pipe, each of the blades can be turned between a first position and a second position, when the blade is in the first position, the blade is parallel to the axis of the pipe pile foundation, the other end of the blade faces the auxiliary equipment; when the blade is in the second position, the blade is inclined to the axis of the pipe pile foundation, the upper part of the blade falls down and fills the gap, the blade is stably arranged in the second position under the extrusion and compaction of the soil; a plurality of blade groups are formed by the plurality of blades, and the plurality of blade groups are arranged along the axial direction of the outer pipe; each of the blade groups includes a plurality of blades, and the plurality of blades of each of the blade groups are uniformly arranged along the circumferential direction of the outer pipe. The auxiliary equipment includes a cabin box and a vibration and percussion linkage disc, the vibration and percussion linkage disc is connected with the second end of the outer pipe and the second end of the inner pipe respectively, the cabin box is mounted on the side of the vibration and percussion linkage disc away from the pipe pile foundation, the vibration and percussion linkage disc is provided with a passage communicating the cabin box and the cavity; a plurality of first openings are arranged on the side of the cabin box facing the vibration and percussion linkage disc, the number of the first openings is the same as the number of the passages, and the other end of each of the passages communicates with the corresponding first opening. After the pipe pile foundation is constructed, the auxiliary equipment can be moved to another pipe pile foundation, connected with the other pipe pile foundation, and used to reinforce the soft soil at the corresponding position of the other pipe pile foundation. Along the circumferential direction of the outer pipe, the blades and the through holes are arranged alternately.

2. A pipe pile foundation apparatus according to claim 1, characterised in that, The pipe pile foundation further includes a ball seat arranged on the outer pipe, the ball seat includes a fixed shell and a ball head, the fixed shell is a spherical shell with an opening, the fixed shell is provided with a receiving cavity, the end of the blade is fixedly connected with the ball head, and the ball head is rotatably arranged in the receiving cavity; the width of the blade is greater than the diameter of the ball head, and the part of the end of the blade exceeding the diameter of the ball head in the width direction abuts at the position of the included angle between the opening wall surface of the fixed shell and the side wall of the outer pipe; when the blade is in the second position, the blade abuts against the opening wall surface.

3. A pipe pile foundation apparatus according to claim 1, wherein The pipe pile foundation further includes a conical ring and a connecting ring, the outer edge of the conical ring is connected with the first end of the outer pipe, and the inner edge is connected with the first end of the inner pipe, the outer edge of the connecting ring is connected with the second end of the outer pipe, and the inner edge is connected with the second end of the inner pipe, a plurality of hole positions are arranged on the connecting ring, the number of the passages is the same as the number of the hole positions, and one end of each of the passages communicates with the corresponding hole position.

4. A pipe pile foundation apparatus according to claim 1, wherein ​ 5. A pipe pile foundation apparatus according to claim 1, wherein The tubular pile foundation further comprises a plurality of filter screens, which are divided into two groups, one group of the filter screens is installed on the inner tube and covers the through holes on the inner tube one by one, and the other group of the filter screens is installed on the outer tube and covers the through holes on the outer tube one by one.

6. A pipe pile foundation apparatus according to claim 1, wherein The auxiliary equipment further comprises a booster pump, a water pump and a switch valve, the booster pump and the switch valve are installed in the cabin box respectively, the cabin box is provided with a second opening hole for connecting a material conveying pipe, the water pump is installed inside the material conveying pipe, and the switch valve is configured to open or close the second opening hole.

7. A pipe pile foundation apparatus according to claim 1, wherein The side of the vibration and impact linkage disc away from the cabin box is provided with an annular groove, and the second end of the tubular pile foundation extends into the annular groove and is detachably connected with the vibration and impact linkage disc.

8. A construction method, characterized by, The construction method for the tubular pile foundation device of any one of claims 1-7 comprises: 1) preparation: providing a tubular pile foundation with a predetermined length and auxiliary equipment, and connecting the tubular pile foundation, the vibration and impact linkage disc and external driving equipment and then placing them above the soft soil body to be penetrated, wherein the first end of the tubular pile foundation is adjacent to the surface of the soft soil body; 2) vertical penetration: moving the vibration and impact linkage disc and the tubular pile foundation vertically downward by the external driving equipment, so that the vibration and impact linkage disc and the tubular pile foundation penetrate into the soft soil body as a whole until the tubular pile foundation reaches a predetermined depth; 3) drainage consolidation: installing the cabin box on the vibration and impact linkage disc, under the driving action of the water pump, the pore water in the soft soil body enters the cavity through the through holes, enters the cabin box through the channel, and is finally discharged from the material conveying pipe until the drainage consolidation requirement is met, wherein the cabin box is connected to the external material device through the material conveying pipe, and the water pump is installed inside the material conveying pipe; 4) vibration and impact consolidation and leaf unfolding: removing the cabin box and controlling the vibration and impact linkage disc to generate vibration, so that the vibration and impact linkage disc drives the tubular pile foundation to vibrate, and the soil particles around the tubular pile foundation are rearranged and compacted; each leaf blade is flipped from the first position to the second position under the vibration of the tubular pile foundation; 5) chemical consolidation: installing the cabin box on the vibration and impact linkage disc, and introducing a consolidating agent into the cabin box by using the external material device, the consolidating agent enters the cavity through the channel, and the consolidating agent in the cavity enters the soft soil body through each through hole and produces chemical consolidation with the soft soil; 6) tubular pile foundation cavity grouting: introducing grouting slurry into the cabin box by using the external material device, the grouting slurry enters the cavity through the cabin box and the channel until the grouting slurry completely fills the cavity, and the grouting slurry in the cavity blocks the through holes, so that the tubular pile foundation forms a solid structure.

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