Grouting pile device for multiple pressurization in soft foundation

Abstract

The utility model discloses a grouting pile device for multiple pressurization in soft foundation, which comprises a vacuum pump, a grouting device, a first vacuum grouting pipe, a second vacuum grouting pipe, a drainage plate and a slurry film bag, the slurry film bag is arranged in the foundation, the drainage plate is vertically arranged in the slurry film bag, the top of the foundation is covered with a sealing film, and the sealing film is arranged in the sealing film. Openings allowing the first vacuum grouting pipe and the second vacuum grouting pipe to stretch in are formed in the sealing film, the top end of the first vacuum grouting pipe communicates with a vacuum pump through a vacuum communicating pipe, and a first valve is arranged between the top end of the first vacuum grouting pipe and the vacuum communicating pipe; slurry can be injected into the second vacuum grouting pipe through grouting equipment and then injected into the slurry film bag through the first change-over valve. Prepressing and grouting are achieved at the same time in single-time construction.

Description

Technical Field

[0001] This utility model relates to civil engineering equipment, and more particularly to a grouting pile device for multiple pressurization in soft foundations. Background Technology

[0002] Thick layers of saturated soft soil are widely distributed along my country's coast, lakes, rivers, and streams. These saturated soft soils are characterized by high water content, high compressibility, high cost of foundation treatment, and low strength. These characteristics bring challenges to various engineering projects, including long construction periods, high costs, and high risks associated with foundation treatment. To address these challenges, industry professionals have been actively exploring various methods for foundation treatment over the years to shorten construction periods, reduce costs, and lower risks, achieving many encouraging results and gaining widespread application in various projects. However, some methods and technologies still have room for improvement. In existing foundation treatment technologies for extremely soft saturated soils, preloading (vacuum or surcharge preloading) is generally performed first. After the foundation soil has reached a certain strength and heavy construction equipment can enter the site, reinforcement or pile construction is then carried out. This requires two types of equipment, two site visits, two construction processes, and two different tests, resulting in long construction periods and high costs. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a grouting pile device for multiple pressurization in soft foundations. This grouting pile device for multiple pressurization in soft foundations has the advantage of achieving preloading and grouting simultaneously in a single construction.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a grouting pile device for multiple pressurization in soft foundations, comprising: a vacuum pump, grouting equipment, a first vacuum grouting pipe, a second vacuum grouting pipe, a drainage board, and a grout film bag. The grout film bag is set inside the foundation, the drainage board is vertically set inside the grout film bag, and the top of the foundation is covered with a sealing membrane. The sealing membrane has openings for the first and second vacuum grouting pipes to extend into. The top end of the first vacuum grouting pipe is connected to the vacuum pump through a vacuum connecting pipe. A first valve is set between the top end of the first vacuum grouting pipe and the vacuum connecting pipe. The bottom end of the first vacuum grouting pipe extends into the grout film bag and is located near the top end of the grout film bag. The top of the connecting drainage board is connected to the top of the second vacuum grouting pipe, which is connected to the vacuum pump via a vacuum connecting pipe. A second valve is installed between the top of the second vacuum grouting pipe and the vacuum connecting pipe. The side wall of the second vacuum grouting pipe is connected to the grouting equipment via a grouting hose. A third valve is installed between the side wall of the second vacuum grouting pipe and the grouting hose. The bottom end of the second vacuum grouting pipe extends into the grout membrane bag and is located near the bottom end of the grout membrane bag. The bottom end of the second vacuum grouting pipe is connected to the bottom end of the drainage board or to the grout membrane bag via a first switching valve. The vacuum pump can generate negative pressure and extract gas and groundwater from the grout membrane bag through the drainage board. The grout can be injected into the second vacuum grouting pipe through the grouting equipment and then injected into the grout membrane bag through the first switching valve.

[0005] Optionally, a second switching valve is also included. The second switching valve is disposed at the bottom end of the first vacuum grouting pipe. The bottom end of the first vacuum grouting pipe can be connected to the top end of the drainage board or to the grout film bag through the second switching valve. The first valve is detachably connected to the top end of the first vacuum grouting pipe. The grouting hose is detachably connected to the third valve. The grouting hose can be detachably connected to the top end of the first vacuum grouting pipe. The grout can be injected into the first vacuum grouting pipe through the grouting equipment and then injected into the grout film bag through the second switching valve.

[0006] Alternatively, the sealing film may be a plastic sealing film.

[0007] Optionally, the outer peripheral walls of the first vacuum grouting pipe and the second vacuum grouting pipe are sealed together by a sealing membrane.

[0008] Optionally, the drainage board is a plastic drainage board with multiple drainage grooves on both sides. The two ends of the drainage grooves are connected to the first vacuum grouting pipe and the second vacuum grouting pipe, respectively. The drainage grooves are wrapped with geotextile, which is breathable and permeable to air and water. The vacuum pump is equipped with a water-air separation mechanism.

[0009] The beneficial technical effects of this utility model are as follows: The grouting pile device for multiple pressurization in soft foundations includes: a vacuum pump, grouting equipment, a first vacuum grouting pipe, a second vacuum grouting pipe, a drainage board, and a grout membrane bag. When preloading of the foundation is required, both the first and second valves are open, the second vacuum grouting pipe is connected to the bottom of the drainage board through the first switching valve, and the third valve is closed. At this time, the vacuum pump generates negative pressure, which draws air from the grout membrane bag through the drainage board. The grout membrane bag is made of breathable and water-permeable material. Because the top of the foundation is covered with a sealing membrane, the top of the foundation is isolated from the air. When negative pressure is generated inside the grout membrane bag, the negative pressure can cause the foundation to contract towards the grout membrane bag and compact the foundation, thereby achieving vacuum preloading of the foundation. At the same time, the drainage board draws air from the grout membrane bag. When air is extracted, the groundwater inside the grout membrane bag can also be drawn out by the drainage board. When grouting is required, both the first and second valves are closed, while the first switching valve is switched to the state of connecting to the grout membrane bag. The third valve opens, and the grout is discharged into the second vacuum grouting pipe through the grouting equipment, and then discharged into the grout membrane bag through the first switching valve. After the grout in the grout membrane bag solidifies, the solidified grout forms a composite foundation with the soil between the piles. Compared with existing equipment, this method can complete both preloading and grouting in a single construction, effectively reducing construction time and improving economy. Furthermore, after the foundation treatment is completed, the grouting hose is not removed. During the construction or use of the building, grout can be injected into the grout membrane bag again as needed to adjust the deformation of the foundation and ground settlement. It has the advantage of achieving preloading and grouting in a single construction. Attached Figure Description

[0010] Figure 1 This is a side sectional view of the entire machine of this utility model;

[0011] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0012] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0013] in:

[0014] 1. Vacuum pump; 2. Grouting equipment; 3. First vacuum grouting pipe; 4. Second vacuum grouting pipe; 5. Drainage board; 6. Grout film bag; 7. Foundation; 8. Sealing membrane; 9. Vacuum connecting pipe; 10. First valve; 11. Second valve; 12. Grouting hose; 13. Third valve; 14. First switching valve; 15. Second switching valve. Detailed Implementation

[0015] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0016] This specific embodiment details the grouting pile device for multiple pressurization in soft foundations as described in this application, such as... Figures 1-3As shown, the grouting pile device for multiple pressurization in soft foundations includes: a vacuum pump 1, grouting equipment 2, a first vacuum grouting pipe 3, a second vacuum grouting pipe 4, a drainage board 5, and a grout film bag 6. The grout film bag 6 is installed inside the foundation 7, and the drainage board 5 is vertically installed inside the grout film bag 6. The top of the foundation 7 is covered with a sealing membrane 8, which has openings for the first vacuum grouting pipe 3 and the second vacuum grouting pipe 4 to extend into. The top end of the first vacuum grouting pipe 3 is connected to the vacuum pump 1 through a vacuum connecting pipe 9. A first valve 10 is installed between the top end of the first vacuum grouting pipe 3 and the vacuum connecting pipe 9. The bottom end of the first vacuum grouting pipe 3 extends into the grout film bag 6 and is located near the top end of the grout film bag 6. The bottom end of the first vacuum grouting pipe 3 is connected to the top end of the drainage board 5. The second vacuum grouting pipe 4... The top end of the grout pipe 4 is connected to the vacuum pump 1 through the vacuum connecting pipe 9. A second valve 11 is provided between the top end of the second vacuum grouting pipe 4 and the vacuum connecting pipe 9. The side wall of the second vacuum grouting pipe 4 is connected to the grouting equipment 2 through the grouting hose 12. A third valve 13 is provided between the side wall of the second vacuum grouting pipe 4 and the grouting hose 12. The bottom end of the second vacuum grouting pipe 4 extends into the grout membrane bag 6 and is located near the bottom end of the grout membrane bag 6. The bottom end of the second vacuum grouting pipe 4 is connected to the bottom end of the drainage board 5 or to the grout membrane bag 6 through the first switching valve 14. The vacuum pump 1 can generate negative pressure and extract gas and groundwater from the grout membrane bag 6 through the drainage board 5. The grout can be injected into the second vacuum grouting pipe 4 through the grouting equipment 2 and then injected into the grout membrane bag 6 through the first switching valve 14. When preloading of the foundation 7 is required, both the first valve 10 and the second valve 11 are open. The second vacuum grouting pipe 4 is connected to the bottom end of the drainage board 5 through the first switching valve 14, and the third valve 13 is closed. At this time, the vacuum pump 1 generates negative pressure, which draws air out of the grout membrane bag 6 through the drainage board 5. The grout membrane bag 6 is made of breathable and water-permeable material. Since the top of the foundation 7 is covered with a sealing membrane 8, the top of the foundation 7 is isolated from the air. When negative pressure is generated inside the grout membrane bag 6, the negative pressure can cause the foundation 7 to contract towards the grout membrane bag 6 and compact the foundation 7, thereby achieving the vacuum preloading operation of the foundation 7. At the same time, when the drainage board 5 draws out the air, the groundwater in the grout membrane bag 6 can also be drawn out by the drainage board 5. When grouting is required... Both the first valve 10 and the second valve 11 are closed. At the same time, the first switching valve 14 is switched to the state of connecting to the grout membrane bag 6. The third valve 13 is opened, and the grout is discharged into the second vacuum grouting pipe 4 through the grouting equipment 2. Then, it is discharged into the grout membrane bag 6 through the first switching valve 14. After the grout in the grout membrane bag 6 solidifies, the solidified grout forms a composite foundation with the soil between the piles. Compared with the existing equipment, it can complete the preloading and grouting processes in a single application, which can effectively reduce the construction time and improve the economy. At the same time, after the foundation treatment 7 is completed, the grouting hose 12 is not removed. During the construction or use of the building, grout can be injected into the grout membrane bag 6 again as needed to adjust the deformation of the foundation and the settlement of the foundation.It has the advantage of achieving preloading and grouting simultaneously in a single construction process.

[0017] Optionally, this embodiment also includes a second switching valve 15, which is disposed at the bottom end of the first vacuum grouting pipe 3. The bottom end of the first vacuum grouting pipe 3 can be connected to the top end of the drainage plate 5 or to the slurry film bag 6 through the second switching valve 15. The first valve 10 is detachably connected to the top end of the first vacuum grouting pipe 3, and the grouting hose 12 is detachably connected to the third valve 13. The grouting hose 12 can be detachably connected to the top end of the first vacuum grouting pipe 3. The slurry can be injected into the first vacuum grouting pipe 3 through the grouting device 2 and then injected into the slurry film bag 6 through the second switching valve 15. When the grout is injected into the grout membrane bag 6 through the first conversion valve 14, the grout solidifies to form a grouting pile. During the formation of the grouting pile, the volume expands, which can increase the lateral pressure on the foundation soil, greatly improve the effective stress of the foundation, and further promote the drainage and consolidation of the foundation soil. After the grout at the bottom of the grout membrane bag 6 solidifies, in order to make the grouting pile fuller, the user can connect the grouting hose 12 to the top of the first vacuum grouting pipe 3. At this time, the grout can be injected into the grout membrane bag 6 through the second conversion valve 15, and solidify at the top of the grouting pile to make the grouting pile fuller, while simultaneously increasing the lateral pressure on the foundation 7. This can be combined with subsequent supplementary grouting during the construction or use of the building to achieve multiple pressure increases.

[0018] Optionally, in this embodiment, the sealing film 8 is a plastic sealing film.

[0019] Optionally in this embodiment, the outer peripheral wall of the first vacuum grouting pipe 3 and the outer peripheral wall of the second vacuum grouting pipe 4 are sealed to the sealing membrane 8.

[0020] Optionally, in this embodiment, the drainage board 5 is a plastic drainage board with multiple drainage channels on both sides. The two ends of each drainage channel are connected to the first vacuum grouting pipe 3 and the second vacuum grouting pipe 4, respectively. The drainage channels are wrapped with geotextile, which is breathable and permeable to air and water. The vacuum pump 1 has a water-gas separation mechanism inside. In this embodiment, soil particles cannot penetrate the geotextile, allowing gas and groundwater in the foundation 7 to enter the drainage channels through the geotextile. The gas and groundwater in the drainage channels, under the influence of vacuum negative pressure and water head difference, flow through the first vacuum grouting pipe 3 or the second vacuum grouting pipe 4 into the vacuum connecting pipe 9. The vacuum connecting pipe 9 transports the incoming gas and groundwater to the vacuum pump 1. The vacuum pump 1 can discharge the groundwater separated by the water-gas separation mechanism onto the sealing membrane 8 or outside the site, and the vacuum pump 1 can discharge the gas separated by the water-gas separation mechanism into the atmosphere. In addition, during the grouting process, the grout can wash away the geotextile, removing some of the fine particles adhering to it, improving the permeability and air permeability of the drainage board 5, and facilitating the accelerated drainage and consolidation of the foundation 7. In some optional embodiments, the grout is mortar or cement grout.

[0021] Using the grouting pile device for multiple pressurization in soft foundations in this embodiment has the advantage of achieving preloading and grouting simultaneously in a single construction.

Claims

1. A method of constructing a pile in a soft ground for multiple pressurization, comprising the steps of, The utility model provides a kind of vacuum grouting device, including: Vacuum pump (1), grouting equipment (2), first vacuum grouting pipe (3), second vacuum grouting pipe (4), drain plate (5) and slurry film bag (6), slurry film bag (6) is set in foundation (7), drain plate (5) is vertically set in slurry film bag (6), the top of foundation (7) is covered with sealing film (8), the opening of sealing film (8) is set with first vacuum grouting pipe (3) and second vacuum grouting pipe (4) and can be inserted into, the top of first vacuum grouting pipe (3) is communicated vacuum pump (1) by vacuum communication pipe (9), first valve (10) is set between the top of first vacuum grouting pipe (3) and vacuum communication pipe (9), the bottom of first vacuum grouting pipe (3) is inserted into slurry film bag (6) and is located close to the top of slurry film bag (6), the bottom of first vacuum grouting pipe (3) is communicated with the top of drain plate (5), the top of second vacuum grouting pipe (4) is communicated vacuum pump (1) by vacuum communication pipe (9), second valve (11) is set between the top of second vacuum grouting pipe (4) and vacuum communication pipe (9), the lateral wall of second vacuum grouting pipe (4) is communicated grouting hose (12) by grouting equipment (2), third valve (13) is set between the lateral wall of second vacuum grouting pipe (4) and grouting hose (12), the bottom of second vacuum grouting pipe (4) is inserted into slurry film bag (6) and is located close to the bottom of slurry film bag (6), the bottom of second vacuum grouting pipe (4) is communicated with the bottom of drain plate (5) or is communicated in slurry film bag (6) by first switching valve (14), vacuum pump (1) can generate negative pressure and extract gas and underground water in slurry film bag (6) by drain plate (5), slurry can be injected into second vacuum grouting pipe (4) by grouting equipment (2) and then be injected into slurry film bag (6) by first switching valve (14).

2. The grouting pile device for multiple pressurization in soft foundations according to claim 1, characterized in that: Also including second switching valve (15), the second switching valve (15) is set in the bottom of first vacuum grouting pipe (3), the bottom of first vacuum grouting pipe (3) can be communicated with the top of drain plate (5) or be communicated in slurry film bag (6) by second switching valve (15), first valve (10) is detachably communicated in the top of first vacuum grouting pipe (3), grouting hose (12) is detachably communicated in third valve (13), grouting hose (12) can be detachably communicated in the top of first vacuum grouting pipe (3), slurry can be injected into first vacuum grouting pipe (3) by grouting equipment (2) and then be injected into slurry film bag (6) by second switching valve (15).

3. The grouting pile device for multiple pressurization in soft foundations according to claim 1, characterized in that: The sealing film (8) is plastic sealing film.

4. The method according to claim 1, wherein the method further comprises the step of: (d) providing a plurality of grouting piles in the soft ground. The outer peripheral wall of the first vacuum grouting pipe (3) and the outer peripheral wall of the second vacuum grouting pipe (4) are sealingly connected to the sealing film (8).

5. The method according to claim 1, wherein the method further comprises the step of: (a) providing a plurality of grouting piles in the soft ground. The drain plate (5) is a plastic drain plate, and a plurality of drainage grooves are arranged on both sides of the drain plate (5). The two ends of the drainage grooves are communicated with the first vacuum grouting pipe (3) and the second vacuum grouting pipe (4), respectively. The outer side of the drainage grooves is wrapped with geotextile. The geotextile is breathable and water-permeable. A water-gas separation mechanism is arranged in the vacuum pump (1).

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