Pile bottom water pumping device and implementation method thereof

Abstract

The invention provides a pile bottom water pumping device and an implementation method thereof, a well core is a hollow circular pipe, is divided into a well core upper section and a well core lower section, and comprises the waterproof well core upper section and the well core lower section provided with a water permeable hole; the sealing plate is an annular plate with a hole in the middle, the diameter of the hole is matched with the outer diameter of the well core, and the well core vertically penetrates through the hole of the sealing plate and is fixedly connected with the sealing plate; and the air bag is made of an inflatable flexible material and is fixed on the periphery of the sealing plate in a surrounding manner. The water pumping device is arranged at the bottom of the cast-in-place pile, the cast-in-place pile and a water pumping well are combined into a whole, and the prefabricated filtering system can also serve as a pile foundation stress section, so that the total cost can be reduced, and the construction period can be shortened; meanwhile, the water pumping system is arranged at the pile bottom, and the pile side gushing risk can be reduced; in addition, the steel pipe and the filtering system are integrated and then synchronously installed and constructed, and the well completion efficiency and quality can be remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering, specifically a pile bottom pumping device and its implementation method. Background Technology

[0002] In areas with soft soil and high water levels, underground engineering construction often employs cast-in-place piles and pumping wells. In the past, pumping wells and cast-in-place piles were typically constructed separately, and this traditional method has the following drawbacks:

[0003] (1) Pumping wells and cast-in-place piles need to be drilled separately, resulting in a large total amount of drilling work and waste soil disposal, high construction costs and long construction period.

[0004] (2) In soft soil high water level deep foundation pit projects, the danger of water inrush on the pile side is often encountered, that is, deep confined water rushes into the foundation pit along the gap between the pile foundation and the pile hole.

[0005] (3) The core and filtration system of traditional pumping wells need to be constructed separately, resulting in low construction efficiency.

[0006] (4) The filter media of traditional pumping wells is a bulk material that needs to be placed from the ground into the gap between the well core and the borehole wall. It is difficult to ensure the filling effect of the filter media, which affects the quality of well completion. To address the above problems.

[0007] In summary, the present invention provides a pile bottom pumping device and its implementation method to solve the above problems. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a pile bottom pumping device and its implementation method, thereby solving the problems of high construction costs, long construction periods, frequent pile side water inrush hazards, and low construction efficiency in deep foundation pit projects with high water levels in soft soil, which are common in the prior art.

[0009] A pile bottom pumping device and its implementation method include an upper section of the well core, a lower section of the well core, a sealing plate, an airbag, a grouting pipe, a reinforcing cage, a precast permeable concrete block, and a filter screen;

[0010] The well core is a hollow round tube divided into an upper section and a lower section, including an impermeable upper section and a lower section with permeable holes;

[0011] The sealing plate is a circular plate with a hole in the middle. The diameter of the hole matches the outer diameter of the well core. The well core passes vertically through the hole of the sealing plate and is fixedly connected to the sealing plate.

[0012] The airbag is an inflatable, flexible material that is fixed around the outer perimeter of the sealing plate.

[0013] The precast permeable concrete block is a hollow cylindrical structure with horizontally penetrating permeable holes and vertical reinforcing materials inside. The vertical reinforcing materials are fixedly connected to the sealing plate.

[0014] A filter screen is wrapped around the outside of the precast permeable concrete block;

[0015] Grouting pipes are fixedly installed inside the reinforcing cage;

[0016] The reinforcing cage is welded to the sealing plate, and the well core, precast permeable concrete blocks, and filter screen are all integrated inside the reinforcing cage.

[0017] Preferably, the permeable holes in the lower section of the well core are evenly distributed along the circumference of the pipe wall.

[0018] Preferably, the horizontal permeable holes of the precast permeable concrete block are arranged at equal intervals along its circumference.

[0019] Preferably, the filter screen is a metal filter screen.

[0020] Preferably, a method for implementing a pile bottom pumping device includes the following steps:

[0021] 1. Pile bottom pumping device and reinforcing cage;

[0022] 2. Drill pile holes to form pile holes, and lower the pile bottom pumping device and the reinforcing cage as a whole to the bottom of the pile hole;

[0023] 3. Inflate the airbag to expand it and completely seal the annular gap between the sealing plate and the inner wall of the pile hole;

[0024] 4. Concrete is poured over the sealing plate and airbag to form the cast-in-place pile body;

[0025] 5. Pumping operations are carried out using the well core;

[0026] 6. After pumping is completed, grout is injected under the sealing plate through the grouting pipe, so that the grout fills the permeable holes of the precast permeable concrete block and the space outside the filter screen, and the pumping device is converted into the load-bearing section of the pile.

[0027] Preferably, in the above steps, the volume of the inflated airbag completely seals the annular gap between the sealing plate and the pile hole.

[0028] Preferably, in the above steps, the grouting material is cement-based grout, and after grouting, the grout penetrates into the permeable holes of the precast permeable concrete block and the soil layer outside the filter screen.

[0029] Preferably, during the concrete pouring process, the sealing plate and the airbag together serve as an isolation layer to prevent concrete from entering the pumping device area below the sealing plate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The invention provides a pumping device for the bottom of a pile and its implementation method. The pumping device is set at the bottom of the cast-in-place pile, which combines the cast-in-place pile and the pumping well into one. The prefabricated filtration system can also serve as the load-bearing section of the pile foundation. This can reduce the overall cost and save the construction period. The invention adopts the simultaneous installation of the integrated steel pipe and filtration system, which can significantly improve the efficiency and quality of well construction.

[0032] 2. The present invention provides a pile bottom pumping device and its implementation method, which effectively blocks the risk of sudden surge on the pile side through the synergistic design of airbag sealing and pile bottom pumping. By concentrating the pumping path at the pile bottom, the channel for pressurized water to surge up along the pile-hole gap is blocked. After grouting, the continuous stress section formed by the solidification of the grout is combined with the precast permeable concrete block to further enhance the bearing capacity of the pile end. At the same time, it solves the problem that traditional pumping wells cannot be used after being abandoned, and realizes functional conversion and efficient use of resources.

[0033] This invention integrates a pumping device at the bottom of the cast-in-place pile with a pumping well, and the prefabricated filtration system can also serve as the load-bearing section of the pile foundation, which can reduce the overall cost and save construction time. At the same time, placing the pumping system at the bottom of the pile can reduce the risk of sudden gushing at the pile side. In addition, this invention uses steel pipes and filtration systems to be integrated and installed simultaneously, which can significantly improve the efficiency and quality of well completion. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the pile bottom pumping device of the present invention;

[0035] Figure 2 This is a schematic diagram of the pile bottom pumping device and the reinforcing cage structure of the present invention;

[0036] Figure 3 This is a cross-sectional view of the lower section of the well core of the present invention;

[0037] Figure 4 This is a cross-sectional view of the upper section of the well core of the present invention;

[0038] Figure 5 This is a schematic diagram of the prefabricated permeable concrete block of the present invention.

[0039] In the diagram: 11. Upper section of the well core; 12. Lower section of the well core; 21. Sealing plate; 22. Airbag; 3. Grouting pipe; 4. Reinforcing cage; 5. Precast permeable concrete block; 6. Filter screen. Detailed Implementation

[0040] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0041] like Figure 1-5As shown, the present invention provides a pile bottom pumping device and its implementation method, including an upper section 11 of the well core, a lower section 12 of the well core, a sealing plate 21, an airbag 22, a grouting pipe 3, a reinforcing cage 4, a precast permeable concrete block 5, and a filter screen 6.

[0042] The well core is a hollow circular tube divided into an upper section 11 and a lower section 12. The well core is an integral structure, including an impermeable upper section 11 and a lower section 12 with permeable holes. The permeable holes of the lower section 12 are evenly distributed along the circumference of the tube wall.

[0043] The sealing plate 21 is a circular annular plate with a central opening. The diameter of the opening matches the outer diameter of the well core. The well core passes vertically through the opening of the sealing plate 21 and is fixedly connected to the sealing plate 21. The sealing plate 21 serves as an isolation element while providing reinforcing ribs on both sides of the well core, making the structure more stable.

[0044] The airbag 22 is made of a flexible, inflatable material, which may be rubber or coated fabric, and is wrapped around and fixed to the outer periphery of the sealing plate 21 to ensure a tight seal.

[0045] The precast permeable concrete block 5 is a hollow cylindrical structure. The horizontal permeable holes of the precast permeable concrete block 5 are arranged at equal intervals along its circumference. The interior is provided with horizontally penetrating permeable holes and vertical reinforcing materials. The vertical reinforcing materials are fixedly connected to the sealing plate 21.

[0046] Filter screen 6 is wrapped around the outside of precast permeable concrete block 5;

[0047] Grouting pipe 3 is fixedly installed inside the steel cage 4;

[0048] The reinforcing cage 4 is welded to the sealing plate 21, and the well core, precast permeable concrete block 5 and filter screen 6 are all integrated inside the reinforcing cage 4. The filter screen 6 is a metal filter screen.

[0049] This invention provides an integrated implementation method for a pile bottom pumping device and a cast-in-place pile, comprising the following steps:

[0050] 1. Fabricate a pumping device and a steel cage 4 at the bottom of the pile, specifically including: welding the well core in sections, inserting it into the opening of the sealing plate 21 and spot welding it in place; prefabricating permeable concrete blocks 5 by embedding vertical reinforcing bars during factory prefabrication and connecting them to the sealing plate 21.

[0051] 2. Drill pile holes to form pile holes, and lower the pile bottom pumping device and the reinforcing cage 4 as a whole to the bottom of the pile hole;

[0052] 3. Inflate the airbag 22 to expand it and completely seal the annular gap between the sealing plate 21 and the inner wall of the pile hole. The volume of the inflated airbag 22 completely seals the annular gap between the sealing plate 21 and the pile hole. After inflation, the pressure of the airbag 22 needs to be tested to ensure that the airbag 22 has no leakage.

[0053] 4. Concrete is poured above the sealing plate 21 and the airbag 22 to form the pile body of the cast-in-place pile. When pouring concrete, the sealing plate 21 and the airbag 22 together serve as an isolation layer to prevent concrete from entering the pumping device area below the sealing plate 21.

[0054] 5. Pumping operations are carried out through the well core, and the pumping rate can be dynamically adjusted based on water level monitoring data during pumping;

[0055] 6. After pumping is completed, grout is injected into the area below the sealing plate 21 through the grouting pipe 3, so that the grout fills the permeable holes of the precast permeable concrete block 5 and the space outside the filter screen 6, and the pumping device is converted into the pile bearing section. The grouting material is cement-based grout. After grouting, the grout penetrates into the soil layer outside the permeable holes of the precast permeable concrete block 5 and the filter screen 6.

[0056] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pile bottom pumping device, characterized in that, Includes upper section of the well core (11), lower section of the well core (12), sealing plate (21), airbag (22), grouting pipe (3), steel cage (4), precast permeable concrete block (5), and filter screen (6); The well core is a hollow round tube and is divided into an upper section (11) and a lower section (12), including an impermeable upper section (11) and a lower section (12) with permeable holes. The sealing plate (21) is a circular plate with a hole in the middle. The diameter of the hole matches the outer diameter of the well core. The well core passes vertically through the hole of the sealing plate (21) and is fixedly connected to the sealing plate (21). The airbag (22) is an inflatable flexible material that is fixed around the outer periphery of the sealing plate (21); The precast permeable concrete block (5) is a hollow cylindrical structure with horizontally penetrating permeable holes and vertical reinforcing materials inside. The vertical reinforcing materials are fixedly connected to the sealing plate (21). A filter screen (6) is wrapped around the outside of a precast permeable concrete block (5); Grouting pipe (3) is fixedly installed inside the steel cage (4); The reinforcing cage (4) is welded to the sealing plate (21), and the well core, precast permeable concrete block (5) and filter screen (6) are all integrated inside the reinforcing cage (4).

2. The pile bottom pumping device as described in claim 1, characterized in that: The permeable holes of the lower section (12) of the well core are evenly distributed along the circumference of the pipe wall.

3. The pile bottom pumping device as described in claim 1, characterized in that: The horizontal permeable holes of the precast permeable concrete block (5) are arranged at equal intervals along its circumference.

4. The pile bottom pumping device and its implementation method as described in claim 1, characterized in that: The filter (6) is a metal filter.

5. A method for implementing a pile bottom pumping device, characterized in that, Includes the following steps: (1) Fabricate the pile bottom pumping device and the reinforcing cage as described in any one of claims 1-4 (4); (2) Drilling is carried out to form pile holes, and the pile bottom pumping device and the steel cage (4) are lowered as a whole to the bottom of the pile hole; (3) Inflate the airbag (22) to expand it and completely seal the annular gap between the sealing plate (21) and the inner wall of the pile hole; (4) Concrete is poured above the sealing plate (21) and the airbag (22) to form the cast-in-place pile body; (5) Pumping operations are carried out through the well core; (6) After the pumping is completed, grout is injected into the space below the sealing plate (21) through the grouting pipe (3) so that the grout fills the permeable holes of the precast permeable concrete block (5) and the space outside the filter screen (6), and the pumping device is converted into the pile bearing section.

6. The method for implementing the pile bottom pumping device as described in claim 5, characterized in that: In step (3), the volume of the inflated airbag (22) completely seals the annular gap between the sealing plate (21) and the pile hole.

7. The method for implementing the pile bottom pumping device as described in claim 5, characterized in that: In step (6), the grouting material is cement-based grout. After grouting, the grout penetrates into the permeable holes of the precast permeable concrete block (5) and the soil layer outside the filter screen (6).

8. The method for implementing the pile bottom pumping device as described in claim 5, characterized in that: In step (4), when pouring concrete, the sealing plate (21) and the airbag (22) together serve as an isolation layer to prevent concrete from entering the pumping device area below the sealing plate (21).

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