A CFG pile construction method

Abstract

The present invention discloses a CFG pile construction method, which includes the following steps: S1: drilling a hole in the ground with a pile driver; S2: injecting a certain amount of cement fly ash crushed stone mixed raw materials into the hole to shape and reinforce the bottom of the pile hole; S3: embedding the middle and upper parts of the pile hole with a composite frame to reinforce and support the shape of the pile hole; S4: pushing the height adjustment rod downward, expanding the inner movable plate outward through the guide plate, so that the positioning cone column extends out and penetrates into the soft soil layer; S5: inserting the reinforcing steel bar through the punching hole, injecting the cement fly ash crushed stone mixed raw materials, so that the cement fly ash crushed stone mixed raw materials enter the composite frame from the gap, and assembling into the CFG pile body. The inner wall of the composite frame in the invention is provided with an inner movable plate, and the outer wall of the inner movable plate is provided with a plurality of positioning cone columns. The connection position between the CFG pile body and the soft soil layer can be reinforced and composited through the composite frame, effectively preventing the collapse and deformation of the soft soil layer.

Description

Technical Field

[0001] The invention relates to the field related to CFG piles, and in particular to a CFG pile construction method. Background Art

[0002] CFG pile is a cement fly ash gravel pile. It is a variable strength pile with a certain strength made by mixing gravel, stone chips, sand, fly ash, cement and water with various pile-making machines. It is a low-strength concrete pile that can make full use of the bearing capacity of the soil between the piles and transfer the load to the deep foundation. It has good technical performance and economic effect.

[0003] Traditional CFG piles cannot be fully bonded with the surrounding soft soil layer. After long-term use, the surrounding soft soil layer is prone to collapse, resulting in a certain gap between the CFG piles and the soft soil layer, poor stability, and difficult construction. Summary of the invention

[0004] The purpose of the present invention is to provide a CFG pile construction method to solve the problem that the traditional CFG pile mentioned in the above background technology cannot be completely composited with the surrounding soft soil layer, and the surrounding soft soil layer is easy to collapse after long-term use, resulting in a certain gap between the CFG pile and the soft soil layer, poor stability and difficult construction.

[0005] To achieve the above object, the present invention provides the following technical solution: a CFG pile construction method, comprising the following steps:

[0006] S1: Drill holes into the ground using a pile driver;

[0007] S2: inject a certain amount of cement fly ash gravel mixed raw materials into the hole to shape and reinforce the bottom of the pile hole;

[0008] S3: The composite frame is embedded in the middle and upper parts of the pile hole to reinforce the shape of the pile hole;

[0009] S4: Push the height adjustment rod downward, expand the inner movable plate outward through the guide plate, and make the positioning cone column extend out and penetrate into the soft soil layer;

[0010] S5: Insert the reinforcing steel bars through the punched holes, inject the cement fly ash crushed stone mixed raw materials, and allow the cement fly ash crushed stone mixed raw materials to enter the composite frame through the gaps to form a CFG pile body.

[0011] In a further embodiment, a composite frame is provided in the middle position inside the CFG pile body, a hollow layer is provided at the position of the inner wall surface of the composite frame, an inner movable plate is provided on the inner wall of the composite frame, a plurality of positioning cone columns are provided on the outer wall of the inner movable plate, a height adjustment rod is provided in the middle position inside the inner movable plate, guide plates are provided on both sides of the height adjustment rod at positions aligned with the inner movable plate, a limit plate is provided on the top of the height adjustment rod, and a bottom plate is provided in the middle position of the bottom of the composite frame.

[0012] In a further embodiment, the cross section of the composite frame is configured as a circular structure, and the height of the composite frame is twice the height of the inner movable panel.

[0013] In a further embodiment, the guide plate is connected to the inner movable plate by sliding inlay, and two-thirds of the lower half of the guide plate is set as an inclined structure.

[0014] In a further embodiment, the positions of the limit plate and the guide plate are set to a staggered structure, and the limit plate is set to a one-eighth fan-shaped structure.

[0015] In a further embodiment, punching holes and irrigation ports are respectively provided inside the limiting plates, reinforcing steel bars are provided inside the punching holes, and the height of the reinforcing steel bars is twice the height of the composite frame.

[0016] In a further embodiment, the positioning cone column is embedded and connected to the composite frame, and the bottom cover plate is welded and connected to the composite frame via a connecting rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The inner wall of the composite frame in the invention is provided with an inner movable plate, and the outer wall of the inner movable plate is provided with a plurality of positioning cone columns. The composite frame can be used to reinforce and composite the connection position between the CFG pile body and the soft soil layer, maintain and support the shape of the soft soil layer, and effectively prevent the collapse and deformation of the soft soil layer. As the height adjustment rod is lowered downward, the guide plate can be slid downward to expand the surrounding inner movable plates outward, so that the positioning cone columns pass through the composite frame and penetrate into the surrounding soft soil layer, thereby limiting the connection position between the composite frame and the soft soil layer, increasing the stability of the CFG pile body installation, while also reducing the construction difficulty and making it easier to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of a CFG pile construction method of the present invention;

[0020] Figure 2 It is a schematic diagram of the contraction structure of the positioning cone column of the present invention;

[0021] Figure 3 It is a schematic diagram of the support structure of the positioning cone column of the present invention;

[0022] Figure 4 A top view of the composite frame of the present invention;

[0023] Figure 5 It is a front view of the composite frame of the present invention;

[0024] Figure 6 It is a top view of the bottom cover plate of the present invention.

[0025] In the figure: 1. CFG pile body; 2. Reinforced steel bars; 3. Composite frame; 4. Positioning cone column; 5. Inner movable plate; 6. Height adjustment rod; 7. Limit plate; 8. Guide plate; 9. Punching hole; 10. Irrigation port; 11. Hollow layer; 12. Connecting rod; 13. Bottom plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] See also Figure 1-6 , an embodiment provided by the present invention: a CFG pile construction method, comprising the following steps:

[0028] S1: Drill holes into the ground using a pile driver;

[0029] S2: inject a certain amount of cement fly ash gravel mixed raw materials into the hole to shape and reinforce the bottom of the pile hole;

[0030] S3: embedding the composite frame 3 in the middle and upper part of the pile hole to reinforce the shape of the pile hole;

[0031] S4: Push the height adjustment rod 6 downward, expand the inner movable plate 5 outward through the guide plate 8, and make the positioning cone column 4 extend and penetrate into the soft soil layer;

[0032] S5: insert the reinforcing steel bar 2 through the punching hole 9, inject the cement fly ash crushed stone mixed raw material, and make the cement fly ash crushed stone mixed raw material enter the composite frame 3 through the gap to assemble into the CFG pile body 1.

[0033] A composite frame 3 is provided in the middle position inside the CFG pile body 1, a hollow layer 11 is provided at the position of the inner wall surface of the composite frame 3, an inner movable plate 5 is provided on the inner wall of the composite frame 3, a plurality of positioning cone columns 4 are provided on the outer wall of the inner movable plate 5, a height adjustment rod 6 is provided in the middle position inside the inner movable plate 5, guide plates 8 are provided on both sides of the height adjustment rod 6 at positions aligned with the inner movable plate 5, a limit plate 7 is provided on the top of the height adjustment rod 6, and a bottom plate 13 is provided in the middle position of the bottom of the composite frame 3. The inner wall of the composite frame is provided with an inner movable plate, and the outer wall of the inner movable plate is provided with a plurality of positioning cone columns. The composite frame can be used to reinforce and composite the connection position between the CFG pile body and the soft soil layer, maintain and support the shape of the soft soil layer, and effectively prevent the collapse and deformation of the soft soil layer. As the height adjustment rod is lowered downward, the guide plate can be slid downward to expand the surrounding inner movable plates outward, so that the positioning cone columns pass through the composite frame and penetrate into the surrounding soft soil layer, thereby limiting the connection position between the composite frame and the soft soil layer, increasing the stability of the CFG pile body installation, while also reducing the construction difficulty and facilitating operation.

[0034] The composite frame 3 is used to support and reinforce the CFG pile body 1, the hollow layer 11 is used to increase the firmness of the composite of the raw material and the pile hole, the inner movable plate 5 is used to adjust and position the installation position of the positioning cone column 4, the positioning cone column 4 is used to penetrate into the soil layer, so that the composite of the CFG pile body 1 and the soft soil layer is more firmly formed, the height adjustment rod 6 is used to adjust and position the position of the inner movable plate 5, the guide plate 8 is used to guide and position the adjusted position of the inner movable plate 5, and the limit plate 7 is used to limit the downward position of the height adjustment rod 6.

[0035] Furthermore, the cross section of the composite frame 3 is set to a circular structure, and the height of the composite frame 3 is twice the height of the inner movable panel 5 .

[0036] The circular structure can make the composite frame 3 more compatible with the pile hole installation.

[0037] Furthermore, the guide plate 8 is connected to the inner movable plate 5 by sliding inlay, and two-thirds of the lower half of the guide plate 8 is set as an inclined structure.

[0038] The sliding inlay makes it easier to slide the guide plate 8 downward for adjustment, which saves more effort.

[0039] Furthermore, the positions of the limiting plate 7 and the guide plate 8 are set to a staggered structure, and the limiting plate 7 is set to a one-eighth sector-shaped structure.

[0040] The staggered structure can increase the internal space, making casting easier.

[0041] Furthermore, a punching hole 9 and an irrigation port 10 are respectively provided inside the limiting plate 7 , and a reinforcing steel bar 2 is provided inside the punching hole 9 , and the height of the reinforcing steel bar 2 is twice the height of the composite frame 3 .

[0042] The irrigation port 10 facilitates the casting of raw materials inside, the punching holes 9 are used to increase the location for installing the reinforcing steel bars 2, and the reinforcing steel bars 2 are used to increase the firmness of the inside.

[0043] Furthermore, the positioning cone column 4 is embedded and connected to the composite frame 3 , and the bottom cover plate 13 is welded and connected to the composite frame 3 via the connecting rod 12 .

[0044] By embedding, it is convenient to embed the positioning cone column 4 through the composite frame 3 and the surrounding soil layer.

[0045] Working principle: When in use, use a pile driver to drill a hole in the ground, first inject a certain amount of cement fly ash and gravel mixed raw materials into the hole, shape and reinforce the bottom of the pile hole, and then inlay the middle and upper parts of the pile hole where the composite frame 3 is installed to reinforce the shape of the pile hole, push the height adjustment rod 6 downward, expand the inner movable plate 5 outward through the guide plate 8, so that the positioning cone column 4 extends out and penetrates into the soft soil layer, and then insert the reinforcing steel bar 2 through the punching hole 9, inject the cement fly ash and gravel mixed raw materials, so that the cement fly ash and gravel mixed raw materials enter the composite frame 3 from the gap, and combine into a CFG pile body 1.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A CFG pile construction method, characterized in that: The following steps are involved: S1: Drill holes into the ground using a pile driver; S2: inject a certain amount of cement fly ash gravel mixed raw materials into the hole to shape and reinforce the bottom of the pile hole; S3: embedding the composite frame (3) into the middle and upper parts of the pile hole to reinforce the shape of the pile hole; S4: Push the height adjustment rod (6) downward, expand the inner movable plate (5) outward through the guide plate (8), and make the positioning cone column (4) extend and penetrate into the soft soil layer; S5: insert the reinforcing steel bar (2) through the punching hole (9), inject the cement fly ash gravel mixed raw material, and allow the cement fly ash gravel mixed raw material to enter the composite frame (3) through the gap to form the CFG pile body (1); A composite frame (3) is provided in the middle of the interior of the CFG pile body (1), a hollow layer (11) is provided at the position of the inner wall surface of the composite frame (3), an inner movable plate (5) is provided on the inner wall of the composite frame (3), a plurality of positioning cone columns (4) are provided on the outer wall of the inner movable plate (5), a height adjustment rod (6) is provided in the middle of the interior of the inner movable plate (5), guide plates (8) are provided at the positions of both sides of the height adjustment rod (6) aligned with the inner movable plate (5), a limit plate (7) is provided at the top of the height adjustment rod (6), and a bottom cover plate (13) is provided in the middle of the bottom of the composite frame (3).

2. A CFG pile construction method according to claim 1, characterized in that: The cross section of the composite frame (3) is set to a circular structure, and the height of the composite frame (3) is twice the height of the inner movable panel (5).

3. A CFG pile construction method according to claim 1, characterized in that: The guide plate (8) is connected to the inner movable plate (5) by sliding inlay, and two-thirds of the lower half of the guide plate (8) is set as an inclined structure.

4. A CFG pile construction method according to claim 1, characterized in that: The positions of the limiting plate (7) and the guide plate (8) are arranged in a staggered structure, and the limiting plate (7) is arranged in a one-eighth sector-shaped structure.

5. A CFG pile construction method according to claim 1, characterized in that: The limiting plate (7) is provided with a punching hole (9) and an irrigation port (10) inside, respectively. The punching hole (9) is provided with a reinforcing steel bar (2), and the height of the reinforcing steel bar (2) is twice the height of the composite frame (3).

6. A CFG pile construction method according to claim 1, characterized in that: The positioning cone column (4) is embedded and connected to the composite frame (3), and the bottom cover plate (13) is welded and connected to the composite frame (3) via a connecting rod (12).

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