Expansion pile and construction method thereof

Abstract

The present invention provides an expansion pile and a construction method thereof, wherein the expansion pile includes a first elastic constraint and an expansion column, wherein a first column cavity is provided inside the first elastic constraint, and a water-permeable hole communicating with the first column cavity is provided on the peripheral wall of the first elastic constraint, and the expansion column is located in the first column cavity and extends in the axial direction of the first column cavity. The expansion pile also includes a support member, which is located in the first column cavity and is arranged adjacent to the inner peripheral wall of the first elastic constraint, and the support member spirally extends and winds around the outer periphery of the expansion column in the axial direction of the first column cavity; in the radial direction of the first column cavity, the cross-sectional area of ​​the expansion column is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first column cavity; the expansion column includes a first expansion material and a second elastic constraint wrapped around the outer periphery of the first expansion material, and the second elastic constraint is water-permeable. The expansion pile of the present invention has low construction cost, good structural strength, simple construction process, convenient operation, and effectively shortens the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation treatment, in particular to an expansion pile and a construction method thereof. Background Art

[0002] At present, the common methods for treating soft soil foundations include using lime-soil compaction piles, cement mixing piles, prestressed pipe piles, etc. Lime-soil compaction piles require lime clinker and soil to be mixed in a certain proportion, and are easily affected by rainy weather, which affects the construction period. They are not suitable for deep soft soil geology, are costly, and have relatively complex construction processes. Cement mixing piles: They are expensive, relatively complex to construct, and require a lot of supporting equipment (storage sites, slurry making sites, etc.); prestressed pipe piles are soil compaction piles. When sinking the piles, the soil around the piles is compacted or squeezed open, causing the soil to move horizontally or bulge vertically, which may cause the adjacent already-driven pipe piles to float, the pile position to shift, or the pile body to warp and break, or affect adjacent buildings, pipelines, or roads. They are not easy to penetrate thicker or harder soil layers, the cross-sectional area of ​​the pile body is small, and the bending and shearing capacity is relatively weak. In addition, most prestressed pipe piles are spliced ​​together, and the bearing capacity at the joints is relatively weak.

[0003] An existing method for constructing solidified soil piles involves placing a restraining device in a drilled pile hole. A solidified soil mixture, formed by mixing soil and a curing agent containing at least a cementitious component and an expansive component, is then placed within the restraining device. The solidified soil mixture in the restraining device is then compacted to form the solidified soil pile. However, this method is complex to construct, susceptible to rainy weather, and exhibits a slow reaction rate. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the first purpose of the present invention is to provide an expansion pile with low construction cost, good structural strength, simple construction process and effective shortening of construction period.

[0005] A second object of the present invention is to provide a construction method for the above-mentioned expansion piles.

[0006] In order to achieve the above-mentioned first purpose, the expansion pile provided by the present invention includes a first elastic constraint part and an expansion column, a first column cavity is opened inside the first elastic constraint part, and a water-permeable hole connected to the first column cavity is opened on the peripheral wall of the first elastic constraint part, and the expansion column is located in the first column cavity and extends in the axial direction of the first column cavity. The expansion pile also includes a support part, which is located in the first column cavity and adjacent to the inner peripheral wall of the first elastic constraint part, and the support part spirally extends and wraps around the outer periphery of the expansion column in the axial direction of the first column cavity; in the radial direction of the first column cavity, the cross-sectional area of ​​the expansion column is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first column cavity; the expansion column includes a first expansion material and a second elastic constraint part wrapped around the outer periphery of the first expansion material, and the second elastic constraint part is water-permeable.

[0007] As can be seen from the above, the expansion material of this solution uses less material and has a lower cost. The volume of the expansion column accounts for 1 / 2 to 2 / 3 of the volume of the accommodating cavity, so that the expansion column has sufficient expansion space, and water enters the expansion column through the water-permeable hole and can fully contact and react with the expansion column, thereby accelerating the expansion rate and shortening the construction period. The provision of support members can effectively shape the pile body and effectively improve the structural strength of the pile body. The provision of the second elastic constraint member can prevent the expansion pile from collapsing during the expansion process.

[0008] A further solution is that the expansion column includes at least two pillars, and the multiple pillars are arranged in parallel in the axial direction of the first column cavity. Each pillar includes a second expansion material and a third elastic constraint wrapped around the outer periphery of the second expansion material, and the third elastic constraint is water-permeable.

[0009] It can be seen from the above that setting up two pillars can effectively speed up the reaction rate and effectively shorten the construction period.

[0010] A further solution is that the expansion column includes at least two expansion blocks, and the multiple expansion blocks are arranged side by side in the axial direction of the first column cavity. Each expansion block includes a third expansion material and a fourth elastic constraint wrapped around the outer periphery of the third expansion material. Two adjacent fourth elastic constraints are connected, and the fourth elastic constraint is water permeable.

[0011] As can be seen from the above, the expansion column includes multiple expansion blocks, and the fourth elastic restraints of two adjacent expansion blocks are connected, so that water can better penetrate into the middle of the expansion column, making the reaction more uniform and rapid.

[0012] A further solution is that each expansion block includes at least two expansion bodies, each expansion body includes a fourth expansion material and a fifth elastic constraint wrapped around the outer periphery of the fourth expansion material, two adjacent fifth elastic constraint members are connected, and the fifth elastic constraint member is water-permeable.

[0013] A further solution is that the support member is a steel wire; and / or the first elastic constraint member is made of an elastic permeable geotextile; and / or the second elastic constraint member is made of an elastic permeable geotextile; and / or the first expansive material is made of a mixture of sodium carbonate, iron powder, aluminum powder, diatomaceous earth, coke powder, activated carbon, salt and quicklime or cement.

[0014] As can be seen from the above, the expansion block includes a plurality of interconnected expansion bodies, so that water can fully contact the expansion material inside the expansion block, thereby accelerating the reaction rate.

[0015] In order to achieve the above second object, the present invention provides a construction method of any one of the above expansion piles, the method comprising the following steps:

[0016] Step 1: Drill pile holes at the preset locations;

[0017] Step 2: Place the expansion pile in the pile hole. The expansion pile includes a first elastic constraint, an expansion column and a support member. A first column cavity is opened inside the first elastic constraint member. A water-permeable hole connected to the first column cavity is opened on the peripheral wall of the first elastic constraint member. The expansion column is located in the first column cavity and extends in the axial direction of the first column cavity. The support member is located in the first column cavity and is adjacent to the inner peripheral wall of the first elastic constraint member. The support member is spirally extended and wound around the outer periphery of the expansion column in the axial direction of the first column cavity. In the radial direction of the first column cavity, the cross-sectional area of ​​the expansion column is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first column cavity. The expansion column includes a first expansion material and a second elastic constraint member wrapped around the outer periphery of the first expansion material. The second elastic constraint member is water-permeable.

[0018] When the preset position does not meet the conditions for the expansion column to fully expand by absorbing water, water is injected into the pile hole.

[0019] As can be seen from the above, this solution has a simple process, is easy to operate, and greatly shortens the construction period.

[0020] A further solution is that the expansion column includes at least two pillars, and the multiple pillars are arranged in parallel in the axial direction of the first column cavity. Each pillar includes a second expansion material and a third elastic constraint wrapped around the outer periphery of the second expansion material, and the third elastic constraint is water-permeable.

[0021] A further solution is that the expansion column includes at least two expansion blocks, and the multiple expansion blocks are arranged side by side in the axial direction of the first column cavity. Each expansion block includes a third expansion material and a fourth elastic constraint wrapped around the outer periphery of the third expansion material. Two adjacent fourth elastic constraints are connected, and the fourth elastic constraint is water permeable.

[0022] A further solution is that each expansion block includes at least two expansion bodies, each expansion body includes a fourth expansion material and a fifth elastic constraint wrapped around the outer periphery of the fourth expansion material, two adjacent fifth elastic constraint members are connected, and the fifth elastic constraint member is water-permeable.

[0023] A further solution is that the support member is a steel wire; and / or the first elastic constraint member is made of an elastic permeable geotextile; and / or the second elastic constraint member is made of an elastic permeable geotextile; and / or the first expansion material is made of at least one of sodium carbonate, iron powder, aluminum powder, diatomaceous earth, coke powder, activated carbon, and salt mixed with quicklime or cement.

[0024] In summary, the expansion piles provided by this solution have low cost, simple structure, fast expansion efficiency, simple process, convenient operation, and effectively shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the first embodiment of the expansion pile of the present invention.

[0026] Figure 2 This is a cross-sectional view of the first embodiment of the expansion pile of the present invention.

[0027] Figure 3 This is a schematic diagram of the operation flow when using the first embodiment of the expansion pile of the present invention for construction.

[0028] Figure 4 This is a cross-sectional view of the second embodiment of the expansion pile of the present invention. DETAILED DESCRIPTION

[0029] The first embodiment of the expansion pile:

[0030] See also Figures 1 to 3 The expansion pile 1 provided in this embodiment includes a support member 2, a first elastic constraint member 3 and an expansion column 4, and an expansion material 9 is arranged in the expansion column 4. A cylindrical first column cavity 5 is provided inside the first elastic constraint member 3. Optionally, the first column cavity 5 can be prismatic or rectangular, etc. The peripheral wall of the first elastic constraint member 3 is provided with a water-permeable hole 6 connected to the first column cavity 5, and the expansion column 4 is located in the first column cavity 5 and extends in the axial direction of the first column cavity 5. The support member 2 is located in the first column cavity 5 and is adjacent to the inner peripheral wall of the first elastic constraint member 3. The support member 2 spirally extends to the two ends of the first column cavity 5 in the axial direction of the first column cavity 5 and is wrapped around the outer periphery of the expansion column 4. In the radial direction of the first column cavity 5, the cross-sectional area of ​​the expansion column 4 is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first column cavity 5, so that the expansion material 9 has sufficient expansion space, and water enters the expansion column 4 through the water-permeable hole 6 to fully contact and react with the expansion column 4, thereby accelerating the expansion rate.

[0031] The expansion column 4 includes a plurality of expansion blocks 7, which are arranged side by side in the axial direction of the first column cavity 5. Each expansion block 7 includes a plurality of expansion bodies 8, each expansion body 8 including an expansion material 9 and a second elastic constraint 10 wrapped around the periphery of the expansion material 9, with two adjacent second elastic constraint members 10 connected. The second elastic constraint 10 can effectively prevent the expansion material 9 from collapsing when it expands, and the connection between the plurality of expansion bodies 8 and the expansion blocks 7 allows water to easily enter the middle of the expansion column 4, fully reacting with the internal expansion material 9, making the reaction more uniform and rapid.

[0032] The support member 2 is a steel wire, and the first elastic restraint member 3 and the second elastic restraint member 10 are both made of elastic, permeable geotextiles. The support member 2 effectively shapes the pile body, facilitating transportation and placement. It also effectively enhances the overall structural strength of the expanded pile 1 after reaction. Preferably, the first expansion material 9 in this embodiment is made from a mixture of materials such as sodium carbonate, iron powder, aluminum powder, diatomaceous earth, coke powder, activated carbon, and cement or quicklime.

[0033] See also Figure 3 When using the expansion pile 1 of this embodiment for construction, the existing drilling equipment is used to drill a pile hole 11 at a preset position on the leveled site to be constructed; then the expansion pile 1 is placed in the pile hole 11, the diameter of the pile hole 11 is smaller than the diameter of the expansion pile 1, and the expansion pile 1 is waited for to absorb water and expand until it fills the pile hole 11. If the pile hole 11 at the preset position does not meet the conditions for the expansion pile 1 to fully expand after absorbing water, the expansion pile 1 is placed in the pile hole 11, and water is added to the pile hole 11 until the expansion pile 1 absorbs water and expands until it fills the pile hole 11, and the construction is completed. The process of using the expansion pile for construction is simple, easy to operate, and greatly reduces the construction cost. In addition, the structural strength of the expansion pile after construction is good, and it can play a stable reinforcing role on the soft soil foundation.

[0034] The second embodiment of the expansion pile:

[0035] See also Figure 4 This embodiment differs from the first in that the expansion column includes two struts 12 arranged parallel to the axis of the first column cavity 13. Each strut 12 includes a second expansion material 15 and a third elastic constraint 14 wrapped around the second expansion material 15. The third elastic constraint 14 is water-permeable. The second expansion material 15 is composed of the same composition as the first expansion material 9, and the third elastic constraint 14 is made of a water-permeable geotextile. This effectively increases the reaction rate and shortens the construction period.

[0036] In summary, the expansion pile of the present invention has low cost, simple structure, fast expansion efficiency, simple process, convenient operation, and effectively shortens the construction period.

[0037] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the scope of protection of the present invention.

Claims

1. An expansion pile comprising a first elastic constraint member and an expansion column, wherein a first column cavity is defined within the first elastic constraint member, a water-permeable hole is defined in a peripheral wall of the first elastic constraint member and communicates with the first column cavity, the expansion column being located within the first column cavity and extending axially within the first column cavity, characterized in that: The expansion pile further includes a support member, the support member is located in the first column cavity and is disposed adjacent to the inner peripheral wall of the first elastic constraint member, the support member spirally extends in the axial direction of the first column cavity and is wound around the outer periphery of the expansion column; In the radial direction of the first cylindrical cavity, the cross-sectional area of ​​the expansion column is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first cylindrical cavity; The expansion column includes a first expansion material and a second elastic constraint member wrapped around the outer periphery of the first expansion material, and the second elastic constraint member is water-permeable.

2. The expansion pile according to claim 1, characterized in that: The expansion column includes at least two pillars, and the multiple pillars are arranged in parallel in the axial direction of the first column cavity. Each of the pillars includes a second expansion material and a third elastic constraint wrapped around the outer periphery of the second expansion material, and the third elastic constraint is water-permeable.

3. The expansion pile according to claim 1, characterized in that: The expansion column includes at least two expansion blocks, and multiple expansion blocks are arranged side by side in the axial direction of the first column cavity. Each expansion block includes a third expansion material and a fourth elastic constraint wrapped around the outer periphery of the third expansion material. Two adjacent fourth elastic constraints are connected, and the fourth elastic constraint is water-permeable.

4. The expansion pile according to claim 3, characterized in that: Each expansion block includes at least two expansion bodies, each expansion body includes a fourth expansion material and a fifth elastic constraint wrapped around the outer periphery of the fourth expansion material, two adjacent fifth elastic constraints are connected, and the fifth elastic constraint is water-permeable.

5. The expansion pile according to any one of claims 1 to 4, characterized in that: The support member is a steel wire; And / or, the first elastic constraint member is made of elastic permeable geotextile; And / or, the second elastic constraint member is made of elastic permeable geotextile; And / or, the first expansion material is made by mixing sodium carbonate, iron powder, aluminum powder, diatomaceous earth, coke powder, activated carbon, salt and quicklime or cement.

6. The construction method of expansion pile is characterized in that: The following steps are involved: Step 1: Drill pile holes at the preset locations; The second step: placing the expansion pile in the pile hole, the expansion pile includes a first elastic constraint, an expansion column and a support member, the first elastic constraint member is provided with a first column cavity inside, the circumferential wall of the first elastic constraint member is provided with a water-permeable hole connected to the first column cavity, the expansion column is located in the first column cavity and extends in the axial direction of the first column cavity, the support member is located in the first column cavity and is arranged adjacent to the inner circumferential wall of the first elastic constraint member, and the support member is spirally extended and wrapped around the outer circumference of the expansion column in the axial direction of the first column cavity; in the radial direction of the first column cavity, the cross-sectional area of ​​the expansion column is between 1 / 2 and 2 / 3 of the cross-sectional area of ​​the first column cavity; the expansion column includes a first expansion material and a second elastic constraint member wrapped around the outer circumference of the first expansion material, and the second elastic constraint member is water-permeable; When the preset position does not meet the condition for the expansion column to fully expand after absorbing water, water is injected into the pile hole.

7. The method for constructing an expansion pile according to claim 6, characterized in that: The expansion column includes at least two pillars, and the multiple pillars are arranged in parallel in the axial direction of the first column cavity. Each of the pillars includes a second expansion material and a third elastic constraint wrapped around the outer periphery of the second expansion material, and the third elastic constraint is water-permeable.

8. The method for constructing an expansion pile according to claim 6, characterized in that: The expansion column includes at least two expansion blocks, and multiple expansion blocks are arranged side by side in the axial direction of the first column cavity. Each expansion block includes a third expansion material and a fourth elastic constraint wrapped around the outer periphery of the third expansion material. Two adjacent fourth elastic constraints are connected, and the fourth elastic constraint is water-permeable.

9. The method for constructing an expansion pile according to claim 8, characterized in that: Each expansion block includes at least two expansion bodies, each expansion body includes a fourth expansion material and a fifth elastic constraint wrapped around the outer periphery of the fourth expansion material, two adjacent fifth elastic constraints are connected, and the fifth elastic constraint is water-permeable.

10. The method for constructing an expansion pile according to any one of claims 6 to 9, characterized in that: The support member is a steel wire; And / or, the first elastic constraint member is made of elastic permeable geotextile; And / or, the second elastic constraint member is made of elastic permeable geotextile; And / or, the first expansion material is made by mixing sodium carbonate, iron powder, aluminum powder, diatomaceous earth, coke powder, activated carbon and quicklime or cement.

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