Construction method for soft soil foundation reinforcement treatment

Abstract

The application discloses a construction method for soft soil foundation reinforcement treatment, S1, drilling a hole in the soft soil foundation; S2, lowering a reinforcing cage in the hole; S3, rotating and lowering a water pumping and grouting pipe through a step-by-step pipe conveying mechanism; S4, rolling the surface of the soft soil foundation by using a hydraulic road roller; S5, laying a plurality of sealing membranes on the surface of the soft soil foundation; S6, connecting the upper end of the water pumping and grouting pipe with a water pump, and pumping out underground water in the soft soil by using the water pump; S7, pumping in concrete into the water pumping and grouting pipe, and gradually pulling out the water pumping and grouting pipe upward by using the step-by-step pipe conveying mechanism, so that the concrete is gradually injected from the lower part of the hole, and the reinforcing cage is located in the concrete. The application effectively pumps out underground water and air in the soft soil foundation, avoids the collapse of the hole, and makes the reinforcement of the soft soil foundation and the pouring process of the concrete pile foundation simple and convenient. The application is suitable for the technical field of soft soil foundation construction in building construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of foundation construction in building construction, in particular, relates to a construction method for soft soil foundation reinforcement treatment. BACKGROUND

[0002] The foundation construction is one of the most important processes in building construction, especially the soft soil foundation construction. Since the soft soil is relatively soft, it contains a lot of underground water and air. If the foundation construction is directly carried out on it, the foundation will be unstable, and the subsequent building operation cannot be carried out smoothly. In order to avoid the above problems, the soft soil needs to be reinforced to have the basic conditions for building. The general effective method is to use the vacuum preloading method to drain the water in the soft soil, so that the soft soil becomes tight from soft. However, in the process of using this method, the vertical pipe drainage inserted into the soil often has the problem of vertical pipe blockage. Moreover, after the vacuum preloading construction is completed, the vertical pipe is very difficult to remove. After the vertical pipe is removed, the reinforced soft soil foundation needs to be drilled and the subsequent concrete pile foundation pouring operation is needed, which is relatively complicated. SUMMARY

[0003] The present application provides a construction method for soft soil foundation reinforcement treatment, which can effectively drain the underground water and air in the soft soil foundation and avoid the collapse of the drill hole, so that the reinforcement of the soft soil foundation and the pouring process of the concrete pile foundation become simple and convenient.

[0004] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0005] A construction method for soft soil foundation reinforcement treatment, comprising the following steps:

[0006] S1, drilling operation is carried out on the soft soil foundation by a drilling machine, so that a plurality of drill holes are uniformly formed on the soft soil foundation;

[0007] S2, a steel reinforcement cage is respectively lowered in each drill hole, ensuring that the lower end of the steel reinforcement cage extends to the bottom end of the drill hole;

[0008] S3, the water pumping and grouting pipe is rotated and lowered by the step-by-step pipe conveying mechanism, so that the lower end of the water pumping and grouting pipe extends to the bottom of the drill hole, and the upper end of the water pumping and grouting pipe extends out of the drill hole;

[0009] S4, the surface of the soft soil foundation is rolled by using a hydraulic road roller;

[0010] S5, after rolling, a plurality of sealing membranes are laid on the surface of the soft soil foundation, and the upper end of the water pumping and grouting pipe extends out of the sealing membrane;

[0011] S6, the upper end of each water pumping pipe is connected with the water pumping end of the water pump through a pipeline, the water pump is used to pump out the underground water in the soft soil, and the gas in the soft soil is discharged above the ground through the steel reinforcement cage;

[0012] S7, after the underground water and the gas in the soft soil are discharged, the water pumping pipe is gradually pulled out upward by pumping the concrete into the water pumping pipe and using the step pipe conveying mechanism, so that the concrete is gradually injected from the lower part of the drill hole, and the steel reinforcement cage is located in the concrete;

[0013] S8, after a period of time after the concrete pouring is completed, the concrete at the drill hole is solidified and forms a pile foundation.

[0014] Further, a pipe fitting adaptation channel is formed at the center of the steel reinforcement cage, and the water pumping pipe extends into the pipe fitting adaptation channel along the axis of the steel reinforcement cage.

[0015] Further, when the soft soil foundation is drilled, the hydraulic pressing mechanism is pressed on the upper end of the drill hole; during the process of concrete grouting and grouting pulling out the water pumping pipe, the hydraulic pressing mechanism is pressed on the upper end of the steel reinforcement cage.

[0016] Further, the hydraulic pressing mechanism comprises a pressing seat connected with the rack through a plurality of first hydraulic cylinders, and the pressing seat is pressed on the upper surface of the soft soil foundation or the upper end of the steel reinforcement cage.

[0017] Further, the pressing seat comprises an annular base, one end of each of the first hydraulic cylinders is connected with the upper end surface of the base, and an inner pressing ring and an outer pressing ring are detachably connected at the inner and outer edges of the base.

[0018] Further, the first hydraulic cylinders are uniformly arranged along the circumference of the base, and the hydraulic rods of each first hydraulic cylinder extend in the vertical direction or in the direction of downward and outward inclination.

[0019] Further, the step pipe conveying mechanism comprises a first pneumatic tightening unit connected with the rack, a second pneumatic tightening unit is arranged above or below the first pneumatic tightening unit, the first pneumatic tightening unit and the second pneumatic tightening unit are connected through a plurality of second hydraulic cylinders, and each second hydraulic cylinder is arranged in the vertical direction.

[0020] Further, the first pneumatic tightening unit comprises a fitting sleeve connected with the rack, a first annular air bag is detachably connected in the fitting sleeve, and the water pumping pipe passes through the first annular air bag; the first annular air bag comprises a fixing sleeve mounted in the fitting sleeve, a second connecting flange detachably connected with a first connecting flange of the fitting sleeve is formed on the fixing sleeve, a tightening bag is formed on the inner wall of the fixing sleeve, and the air cavity of the tightening bag is in communication with the first gas joint.

[0021] Further, the second pneumatic tightening unit comprises a movable seat connected with the second hydraulic cylinder, and a second annular air bag is arranged on the movable seat, and the water-jet grouting pipe passes through the second annular air bag.

[0022] Further, a mounting sleeve is arranged on the movable seat, a rotating sleeve is rotatably connected in the mounting sleeve, a plurality of communication openings are uniformly arranged on the circumferential wall of the rotating sleeve along the circumferential direction, the second annular air bag is fixed on the inner wall of the rotating sleeve, an annular cavity formed between the mounting sleeve and the rotating sleeve is communicated with the air cavity of the second annular air bag through the communication openings, and a second gas joint communicated with the annular cavity is arranged on the mounting sleeve; an outer gear ring is arranged on the upper end or the lower end of the rotating sleeve, and a driving motor is arranged on the movable seat, and an output shaft of the driving motor is provided with a driving gear engaged with the outer gear ring.

[0023] Compared with the prior art, the application has the following technical progress: the application is an improvement on the existing vacuum preloading method, which mainly comprises the following steps: firstly, drilling holes in the soft soil foundation, the diameter of the drilled holes is equal to or close to the radial length of the subsequent concrete pile foundation; secondly, lowering a reinforcing cage into the drilled holes to support the hole wall and avoid hole collapse during the vacuum preloading process; thirdly, inserting a water-jet grouting pipe into the reinforcing cage, so that the reinforcing cage separates the soft soil outside the drilled holes from the water-jet grouting pipe, avoiding the blockage of the water-jet grouting pipe caused by the mixing of a large amount of soil during the drainage process; and fourthly, gradually reducing the gaps in the soil under the vacuum and external force preloading, so that the water and gas in the soil gradually seep into the adjacent drilled holes; since the reinforcing cage is connected with the ground, the gas is gathered at the reinforcing cage and discharged, and the underground water is gathered at the lower part of the reinforcing cage and discharged by the water-jet grouting pipe; after the soft soil drainage and degassing are completed, the soil becomes compacted, so that the concrete pile foundation can be poured, and after all the ground pipelines, water pumps and sealing membranes are removed, the upper end of the water-jet grouting pipe is connected with the outlet of a mortar pump through a hose, and then the water-jet grouting pipe is gradually pulled out, so that the operation of pulling out the water-jet grouting pipe is more smooth and fast compared with the unimproved vacuum preloading method; while the water-jet grouting pipe is gradually pulled out, the drilled holes are poured with concrete, so that the concrete gradually fills the drilled holes from bottom to top; after the concrete solidifies, the concrete and the reinforcing cage form the concrete pile foundation; compared with the original vacuum preloading method, the application can effectively discharge the underground water and air in the soft soil foundation, and avoid the collapse of the drilled holes, so that the reinforcement of the soft soil foundation and the pouring process of the concrete pile foundation become simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are meant to explain the present application and are not intended to limit the application.

[0025] In the drawings:

[0026] Figure 1 Process flow chart of the embodiment of the present application;

[0027] Figure 2 Structure diagram of the embodiment of the present application for assembling the reinforcement cage and the grouting pipe into the borehole;

[0028] Figure 3 Structure diagram of the reinforcement cage of the embodiment of the present application;

[0029] Figure 4 Top view of the structure of the reinforcement cage of the embodiment of the present application;

[0030] Figure 5 Structure diagram of the hydraulic pressing mechanism and the step-by-step pipe conveying mechanism of the embodiment of the present application;

[0031] Figure 6 Front view of the structure of the hydraulic pressing mechanism, the step-by-step pipe conveying mechanism and the grouting pipe of the embodiment of the present application;

[0032] Figure 7 Front view of the structure of the machine frame, the first pneumatic tightening unit and the hydraulic pressing mechanism of the embodiment of the present application;

[0033] Figure 8 Structure diagram of the second hydraulic cylinder, the machine frame, the first pneumatic tightening unit and the hydraulic pressing mechanism of the embodiment of the present application;

[0034] Figure 9 Structure diagram of the second pneumatic tightening unit of the embodiment of the present application;

[0035] Figure 10 Structure diagram of the second pneumatic tightening unit of the embodiment of the present application after being disassembled;

[0036] Figure 11 Axial structure sectional view of the installation sleeve, the rotating sleeve and the second annular air bag of the embodiment of the present application after being connected;

[0037] Figure 12 Structure diagram of the machine frame, the first pneumatic tightening unit and the hydraulic pressing mechanism of the embodiment of the present application;

[0038] Figure 13 Axial structure sectional view of the Figure 12

[0039] Figure 14 ​This is a schematic diagram of the hydraulic pressing mechanism according to an embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram of the disassembled hydraulic pressing mechanism according to an embodiment of the present invention;

[0041] Figure 16 This is an axial structural cross-sectional view of the second annular airbag according to an embodiment of the present invention.

[0042] Components marked: 100-Drilling hole, 200-Reinforcing cage, 201-Pipe fitting adapter channel, 300-Pumping grouting pipe, 400-Hydraulic pressing mechanism, 401-Base, 402-Inner connecting edge, 403-Outer connecting edge, 404-Inner pressing ring, 405-First annular groove, 406-Outer pressing ring, 407-Second annular groove, 500-Frame, 600-First pneumatic tightening unit, 601-Assembly kit, 602-First connecting flange, 603-Fixing sleeve, 604 - Second connecting flange, 605-Tightening bladder, 606-First gas connector, 700-First hydraulic cylinder, 800-Second pneumatic tightening unit, 801-Modible seat, 802-Mounting sleeve, 803-Second gas connector, 804-Rotating sleeve, 805-Connecting port, 806-Second annular air bladder, 807-External gear ring, 808-Annular chamber, 809-Drive motor, 810-Drive gear, 811-Annular edge, 812-Sealing ring, 900-Second hydraulic cylinder. Detailed Implementation

[0043] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0044] This invention discloses a construction method for reinforcing soft soil foundations, such as... Figures 1-2 As shown, it includes the following steps:

[0045] S1. Drilling is carried out using a drilling rig in the soft soil foundation to create multiple holes 100 evenly on the soft soil foundation.

[0046] S2. A steel cage 200 is placed in each borehole 100, ensuring that the lower end of the steel cage 200 extends to the bottom of the borehole 100.

[0047] S3. The pumping grouting pipe 300 is rotated and lowered by the stepping pipe conveying mechanism, so that the lower end of the pumping grouting pipe 300 extends to the bottom of the borehole 100 and the upper end of the pumping grouting pipe 300 extends out of the borehole 100.

[0048] S4. Use a hydraulic roller to compact the surface of the soft soil foundation;

[0049] S5, after rolling, on the surface of the soft soil foundation laid several layers of sealing film, and make sure the upper end of the water injection pipe 300 out of the sealing film;

[0050] S6, the upper end of each water injection pipe 300 through the pipeline and water pump water end connection, using water pump to discharge the groundwater in the soft soil, the gas in the soft soil through the reinforcement cage 200 to above ground;

[0051] S7, after the groundwater and gas in the soft soil, by the water injection pipe 300 to pump in the concrete, and using the step pipe conveying mechanism to gradually pull out the water injection pipe 300, so that the concrete gradually from the lower part of the drill hole 100 injection, and make the reinforcement cage 200 in the concrete;

[0052] S8, after a period of time, the concrete pouring in the drill hole 100 solidification and form pile foundation, finally, the surface above each pipeline, water pump and other components, etc. are removed.

[0053] The working principle and advantages of the present application are that: the present application is an improvement on the existing vacuum preloading method, which mainly drills a hole in the soft soil foundation, the diameter of the drilled hole is equal to or close to the radial length of the subsequent concrete pile foundation, then the reinforcement cage 200 is lowered into the drilled hole 100, so that the reinforcement cage 200 supports the hole wall of the drilled hole 100, avoiding the collapse of the hole during the vacuum preloading process; then the water pumping and grouting pipe 300 is inserted into the reinforcement cage 200, so that the reinforcement cage 200 also plays a role in separating the soft soil outside the drilled hole 100 from the water pumping and grouting pipe 300, avoiding the mixing of a large amount of soil into the water pumping and grouting pipe 300 during the drainage process, and at the same time, under the action of vacuum and external force, the gap in the soil gradually becomes smaller, and the water and gas in the soil gradually seep into the adjacent drilled hole 100, so that the gas gathers at the reinforcement cage 200 and is discharged, and the underground water gathers at the lower part of the reinforcement cage 200 and is discharged by the water pumping and grouting pipe 300; after the soft soil drainage and exhaust operation is completed, the soil quality of the soft soil becomes dense, so that the concrete pile foundation pouring operation can be carried out, after all the surface pipelines, water pumps and sealing membranes and other components are removed, first, the upper end of the water pumping and grouting pipe 300 is connected to the outlet of the mortar pump through a hose, then the water pumping and grouting pipe 300 is gradually pulled out, due to the arrangement of the reinforcement cage 200, the pulling out operation of the water pumping and grouting pipe 300 is more smooth and fast compared with the pulling out operation when the vacuum preloading method is not improved, while the water pumping and grouting pipe 300 is gradually pulled out, the drilled hole 100 is poured with concrete, so that the concrete gradually fills the drilled hole 100 from bottom to top, after the concrete solidifies, the concrete and the reinforcement cage 200 form a concrete pile foundation; compared with the original vacuum preloading method, the present application can effectively discharge the underground water and air in the soft soil foundation, and avoid the collapse of the drilled hole 100, so that the soft soil foundation reinforcement and concrete pile foundation pouring process become simple and convenient.

[0054] As a preferred embodiment of the present application, in order to facilitate the insertion of the water pumping and grouting pipe 300 into the reinforcement cage 200 and the pulling out of the reinforcement cage 200 during subsequent grouting, the measures taken are as follows: Figures 3-4 As shown in the figure, a pipe fitting adaptation channel 201 is formed at the center of the reinforcement cage 200, and the water pumping and grouting pipe 300 extends into the pipe fitting adaptation channel 201 along the axis of the reinforcement cage 200. In this embodiment, the water pumping and grouting pipe 300 is located at the center of the reinforcement cage 200, the underground water gathers at the bottom of the reinforcement cage 200, so that the water pumping operation of the water pumping and grouting pipe 300 is smooth, and during the grouting operation of the drilled hole 100, the concrete comes out of the water pumping and grouting pipe 300, and ensures that the concrete is uniformly filled into the drilled hole 100, avoiding the occurrence of local uneven filling in the drilled hole 100.

[0055] As a preferred embodiment of the present application, when drilling a soft soil foundation, the hydraulic pressing mechanism 400 is used to press against the upper end of the drill hole 100, at which time the hydraulic pressing mechanism 400 prevents the soil from turning over during drilling. During the process of injecting concrete into the drill hole 100 and pulling out the water injection pipe 300, the hydraulic pressing mechanism 400 is used to press against the upper end of the reinforcement cage 200, at which time the hydraulic pressing mechanism 400 prevents the reinforcement cage 200 from moving with the water injection pipe 300. The specific structure of the hydraulic pressing mechanism 400 of this embodiment is as follows: Figure 5 , 7-8、13-15, the hydraulic pressing mechanism 400 comprises a pressing seat connected with the frame 500 through a plurality of first hydraulic cylinders 700, and the pressing seat presses on the upper surface of the soft soil foundation or the upper end of the reinforcement cage 200. The pressing seat comprises an annular base 401, one end of each first hydraulic cylinder 700 is connected with the upper end surface of the base 401, and the first hydraulic cylinders 700 are uniformly arranged along the circumference of the base 401, and the hydraulic rod of each first hydraulic cylinder 700 extends in the vertical direction or in the direction of downward and outward inclination. When the hydraulic rod of the first hydraulic cylinder 700 is arranged vertically, the base 401 is an integral structure, and the first hydraulic cylinders 700 act synchronously to press the base 401 downward on the soft soil or the reinforcement cage 200. When the hydraulic rod of the first hydraulic cylinder 700 is arranged in the direction of downward and outward inclination, the cylinder body of the first hydraulic cylinder 700 is hinged to the frame 500, the hydraulic rod of the first hydraulic cylinder 700 is hinged to the base 401, and the base 401 is a split structure, and the split structures form an annular structure (the base 401), that is, each split part of the base 401 is hinged to the corresponding hydraulic rod, and when the first hydraulic cylinders 700 act synchronously, the base 401 presses downward and outward on the soft soil or the reinforcement cage 200, so that the target object subjected to pressing is subjected to vertical downward force and horizontal outward force, and the overturned soil or the reinforcement cage 200 with upward movement tendency is subjected to the two forces, the overturned soil is extruded downward and outward of the borehole 100, and finally the soil is extruded at the hole wall of the borehole 100, so that the soil is extruded at the hole wall of the borehole 100, and thus the soil is extruded at the hole wall of the borehole 100. It can be seen that the embodiment improves the effect of preventing soil overturning. In order to adapt to different diameters of the borehole 100 or different radial sizes of the reinforcement cage 200 and realize adjustment of the pressing range, the inner pressing ring 404 and the outer pressing ring 406 are detachably connected to the inner edge and the outer edge of the base 401. Specifically, the inner connecting edge 402 and the outer connecting edge 403 are respectively formed on the inner circumferential wall and the outer circumferential wall of the base 401, the first annular groove 405 is formed on the outer circumferential wall of the inner pressing ring 404, the base 401 adopts a split structure, the inner pressing ring 404 is assembled on the base 401 and then fastened and connected by bolts. The outer pressing ring 406 adopts a split structure, the second annular groove 407 is formed on the inner circumferential wall of the outer pressing ring 406, the two parts of the outer pressing ring 406 are assembled on the base 401 and then spliced, at this time the outer connecting edge 403 is assembled in the second annular groove 407, and then the outer pressing ring 406 and the base 401 are fastened and connected by bolts. The embodiment realizes adjustment of the pressing range by replacing different models of the inner pressing ring 404 and the outer pressing ring 406, so that the pressing seat adapts to different diameters of the borehole 100 and different radial lengths of the reinforcement cage 200.The grouting pipe 300 of the embodiment can pass through the center of the inner stabilizing ring 404, i.e. the range of the compression of the stabilizing seat is outside the pipe fitting adapting channel 201.

[0056] As a preferred embodiment of the present application, as shown in Figures 5-6 The step-by-step pipe conveying mechanism comprises a first pneumatic clamping unit 600 and a second pneumatic clamping unit 800, the first pneumatic clamping unit 600 is detachably connected with the frame 500, the second pneumatic clamping unit 800 is arranged above or below the first pneumatic clamping unit 600, and the first pneumatic clamping unit 600 and the second pneumatic clamping unit 800 are connected through a plurality of second hydraulic cylinders 900, each of which is arranged in a vertical direction. The second pneumatic clamping unit 800 of the embodiment is used to clamp the grouting pipe 300, and then the vertical action of the second pneumatic clamping unit 800 is driven by the second hydraulic cylinder 900, so that the second pneumatic clamping unit 800 drives the grouting pipe 300 to move in the vertical direction. When the second hydraulic cylinder 900 completes a stroke, the first pneumatic clamping unit 600 clamps the grouting pipe 300, and the second pneumatic clamping unit 800 releases the clamping of the grouting pipe 300. Then, the second hydraulic cylinder 900 drives the second pneumatic clamping unit 800 to return, and then the second pneumatic clamping unit 800 clamps the grouting pipe 300, and the first pneumatic clamping unit 600 releases the clamping of the grouting pipe 300. The second hydraulic cylinder 900 repeats the above action again, and so on, thereby realizing the step-by-step insertion or extraction of the grouting pipe 300 into the reinforcement cage 200, so that the conveying of the grouting pipe 300 is more stable during insertion. During the step-by-step movement of the grouting pipe 300, the grouting pipe 300 pours concrete into the borehole 100, so that after the concrete pouring is completed in each stroke, the next stroke movement and pouring operation are performed, achieving the purpose of filling the concrete in the borehole 100, and avoiding the influence of local pouring on the quality of the pile foundation.

[0057] As a preferred embodiment of the present application, as shown in Figures 12-13As shown, the first pneumatic tightening unit 600 comprises an assembling sleeve 601 and a first annular air bag, wherein the assembling sleeve 601 is detachably connected with the rack 500, the first annular air bag is detachably connected in the assembling sleeve 601, the grouting pipe 300 passes through the first annular air bag, and the tightening or untightening of the first annular air bag to the grouting pipe 300 is realized by inflating or deflating the first annular air bag. The first annular air bag of the embodiment comprises the assembling sleeve 601 and a fixing sleeve 603, wherein the fixing sleeve 603 is installed in the assembling sleeve 601, the fixing sleeve 603 is provided with a second connecting flange 604 which is detachably connected with a first connecting flange 602 of the assembling sleeve 601, and the fixing sleeve 603 is provided with a tightening bag 605 on the inner wall, and the air cavity of the tightening bag 605 is communicated with a first gas joint 606. The embodiment has a plurality of fixing sleeves 603 of different types, and the difference of the types of the fixing sleeves 603 mainly lies in the tightening bag 605, that is, the grouting pipe 300 of the corresponding pipe diameter is inflated and tightened by the different tightening bags 605, and the clamping of the different grouting pipes 300 is realized by replacing the different fixing sleeves 603.

[0058] As a preferred embodiment of the present application, as Figures 9-11As shown, the second pneumatic tightening unit 800 comprises a movable seat 801 connected with the second hydraulic cylinder 900, and a second annular air bag 806 is arranged on the movable seat 801, and the water-jet grouting pipe 300 passes through the second annular air bag 806, and the tightening or the tight contact of the second annular air bag 806 to the water-jet grouting pipe 300 is realized by inflating or deflating the second annular air bag 806. In order to facilitate the water-jet grouting pipe 300 to be smoothly inserted into the reinforcement cage 200, and to ensure that the concrete is fully poured into the drill hole 100 in the process that the water-jet grouting pipe 300 pulls out the reinforcement cage 200, the water-jet grouting pipe 300 is driven to rotate in the process of being inserted or pulled out. Specifically, a mounting sleeve 802 is constructed on the movable seat 801, a rotating sleeve 804 is rotatably connected in the mounting sleeve 802, the second annular air bag 806 is fixed on the inner wall of the rotating sleeve 804, an annular chamber 808 is formed between the mounting sleeve 802 and the rotating sleeve 804, a plurality of communication openings 805 are uniformly arranged on the circumferential wall of the rotating sleeve 804 and communicate the annular chamber 808 and the air cavity of the second annular air bag 806, and a second gas joint 803 is constructed on the mounting sleeve 802 and communicates with the annular chamber 808. The outer gear ring 807 is assembled on the upper end or the lower end of the rotating sleeve 804, the driving motor 809 is installed on the movable seat 801, the output shaft of the driving motor 809 is assembled with the driving gear 810, and the driving gear 810 is engaged with the outer gear ring 807. The working principle and advantages of the embodiment are that: the second annular air bag 806 is inflated through the second gas joint 803, so that the second annular air bag 806 tightens the water-jet grouting pipe 300, then the driving motor 809 is controlled to act, so that the driving gear 810 drives the outer gear ring 807 to rotate, the outer gear ring 807 drives the rotating sleeve 804 and the second annular air bag 806 to synchronously rotate, and then the rotation of the water-jet grouting pipe 300 is realized, and at the same time of rotating, the second hydraulic cylinder 900 is controlled to act, so that the water-jet grouting pipe 300 moves along the vertical direction, and then the water-jet grouting pipe 300 is smoothly inserted into the reinforcement cage 200; or in the process that the water-jet grouting pipe 300 pulls out the reinforcement cage 200, the water-jet grouting pipe 300 rotates and performs the grouting operation, so that the concrete is fully poured into the drill hole 100, and the problem of uneven pouring is avoided. The second annular air bag 806 of the embodiment can also be in a detachable form, and the purpose is to adapt to the tightening of the water-jet grouting pipe 300 with different diameters, such as Figure 16 As shown, the annular rims 811 are respectively constructed at the upper and lower ends of the second annular air bag 806, the two annular rims 811 are assembled on the inner wall of the rotating sleeve 804 and are fastened with the rotating sleeve 804 through a plurality of bolts. In order to ensure the sealing property of the second annular air bag 806, the sealing rings 812 are sleeved on the surfaces of each annular rim 811 and the rotating sleeve 804.

[0059] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or some of the technical features thereof can be replaced by equivalent features. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction method for soft ground improvement treatment, characterized by, It comprises the following steps: S1, drilling operation is carried out on the soft soil foundation by a drilling machine, so that a plurality of drill holes are formed on the soft soil foundation uniformly; S2, a reinforcement cage is respectively lowered in each drill hole, and the lower end of the reinforcement cage extends to the bottom end of the drill hole; S3, the water pumping and grouting pipe is rotated and lowered by the step-by-step pipe conveying mechanism, so that the lower end of the water pumping and grouting pipe extends to the bottom of the drill hole, and the upper end of the water pumping and grouting pipe extends out of the drill hole; S4, the surface of the soft soil foundation is rolled by using a hydraulic road roller; S5, after rolling, a plurality of sealing membranes are laid on the surface of the soft soil foundation, and the upper end of the water pumping and grouting pipe extends out of the sealing membrane; S6, the upper end of each water pumping and grouting pipe is connected to the water pumping end of the water pump through a pipeline, and the underground water in the soft soil is pumped out by using the water pump, and the gas in the soft soil is discharged above the ground through the reinforcement cage; S7, after the underground water and gas in the soft soil are discharged, the water pumping and grouting pipe is gradually pulled out upward by pumping concrete into the water pumping and grouting pipe and using the step-by-step pipe conveying mechanism, so that the concrete is gradually injected from the lower part of the drill hole, and the reinforcement cage is located in the concrete; S8, after a period of time after the concrete pouring is completed, the concrete at the drill hole is solidified and forms a pile foundation; A pipe fitting adaptation channel is formed at the center of the reinforcement cage, and the water pumping and grouting pipe extends into the pipe fitting adaptation channel along the axis of the reinforcement cage; When drilling the soft soil foundation, the hydraulic pressure mechanism is pressed on the upper end of the drill hole; during the process of concrete grouting and grouting pulling out the water pumping and grouting pipe, the hydraulic pressure mechanism is pressed on the upper end of the reinforcement cage; The hydraulic pressure mechanism comprises a pressing seat connected to the frame by a plurality of first hydraulic cylinders, and the pressing seat is pressed on the upper surface of the soft soil foundation or the upper end of the reinforcement cage; The pressing seat comprises an annular base, one end of each first hydraulic cylinder is connected to the upper end surface of the base, and an inner pressing ring and an outer pressing ring are detachably connected to the inner and outer edges of the base; The first hydraulic cylinders are uniformly arranged along the circumference of the base, and the hydraulic rods of each first hydraulic cylinder extend in the vertical direction or in the direction of downward and outward inclination; The step-by-step pipe conveying mechanism comprises a first pneumatic tightening unit connected to the frame, a second pneumatic tightening unit is arranged above or below the first pneumatic tightening unit, the first and second pneumatic tightening units are connected by a plurality of second hydraulic cylinders, and each second hydraulic cylinder is arranged in the vertical direction; The first pneumatic tightening unit comprises a fitting sleeve connected to the frame, a first annular air bag is detachably connected in the fitting sleeve, and the water pumping and grouting pipe passes through the first annular air bag; the first annular air bag comprises a fixed sleeve mounted in the fitting sleeve, a second connecting flange is formed on the fixed sleeve and detachably connected with a first connecting flange of the fitting sleeve, a tightening bag is formed on the inner wall of the fixed sleeve, and the air cavity of the tightening bag is in communication with a first gas joint.

2. The construction method for soft ground improvement according to claim 1, wherein: The second pneumatic tightening unit comprises a movable seat connected to the second hydraulic cylinder, a second annular air bag is arranged on the movable seat, and the water pumping and grouting pipe passes through the second annular air bag.

3. The construction method for soft ground improvement according to claim 2, wherein: An installation sleeve is arranged on the movable seat, a rotating sleeve is rotatably connected in the installation sleeve, a plurality of communication openings are uniformly arranged on the circumferential wall of the rotating sleeve, the second annular air bag is fixed on the inner wall of the rotating sleeve, the annular cavity formed between the installation sleeve and the rotating sleeve is communicated with the air cavity of the second annular air bag through the communication openings, and a second gas joint is arranged on the installation sleeve and communicated with the annular cavity; an outer gear ring is arranged on the upper end or the lower end of the rotating sleeve, and a driving motor is arranged on the movable seat, wherein an output shaft of the driving motor is provided with a driving gear engaged with the outer gear ring.

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