Lattice column, cast-in-place pile structure and method for chiseling away concrete

Abstract

The invention discloses a latticed column, a cast-in-place pile structure and a method for chiseling away concrete, the latticed column comprises a plurality of stand columns and a plurality of batten plate assemblies arranged at intervals, each batten plate assembly comprises a plurality of batten plates connecting the stand columns, an air bag is arranged in a stand column inner cavity defined by the stand columns, and the air bag is attached to the inner surfaces of the stand columns. According to the latticed column, the cast-in-place pile structure and the method for chiseling away the concrete, by means of the air bag in the inner cavity of the stand column and the contraction characteristic of the air bag, the air bag can be in an uninflated contraction state in the over-inflation process of pouring concrete, and the concrete can enter the inner cavity of the stand column to be poured; and after pouring is completed, the air bag is inflated, and the expanded air bag can extrude the concrete out of the inner cavity of the stand column, so that after pouring is completed and a cast-in-place pile is formed, only the air bag needs to be dismantled, the concrete in the inner cavity of the stand column does not need to be chiseled away or a small amount of residual concrete does not need to be chiseled away, the workload is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, in particular to a lattice column, a cast-in-place pile structure and a method for chiseling out concrete. Background Art

[0002] During construction, it is necessary to dig a foundation pit. In the foundation pit project, the lattice column is an important part of the foundation pit support. In order for the lattice column to play its due supporting role, it is necessary to construct a bored cast-in-place pile foundation under the lattice column. Usually, the bored cast-in-place pile foundation is higher than the bottom of the foundation pit. In order to construct the foundation pit floor and ensure the construction quality of the foundation pit floor, it is necessary to chisel out the pile head of the bored cast-in-place pile (the part of the bored cast-in-place pile that exceeds the bottom of the foundation pit). At this time, the concrete outside the lattice column is easy to chisel out, and it can be easily chiseled out by conventional chiseling methods. However, the concrete in the internal space of the lattice column is surrounded by components such as the lattice column slab and the surrounding angle steel (the angle steel is the column of the lattice column), which is difficult to chisel out. If it needs to be chiseled out, it will take a lot of effort, a large workload, and low efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art that it is difficult to chisel out the concrete in the inner space of the lattice column of the foundation pit project, the workload is large and the construction efficiency is low, and a lattice column, a cast-in-place pile structure and a method for chiseling out concrete are provided.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A lattice column is used for cast-in-place piles in foundation pit construction. The lattice column includes a plurality of columns and a plurality of plate assemblies arranged at intervals along the extension direction of the columns. Each of the plate assemblies includes a plurality of plates connecting the plurality of columns. An air bag is provided in the inner cavity of the column surrounded by the plurality of columns. The air bag is attached to the inner surface of the column.

[0006] In this solution, the lattice column sets an airbag in the inner cavity of the column and utilizes the shrinkage characteristics of the airbag. During the overfilling of the concrete, the airbag can be placed in an uninflated and contracted state, and the concrete can enter the inner cavity of the column for pouring; and after the pouring is completed, the airbag is inflated, and the expanded airbag can squeeze the concrete out of the inner cavity of the column. Therefore, after the pouring is completed and the cast-in-place pile is formed, it is only necessary to remove the airbag without chiseling out the concrete in the inner cavity of the column (i.e., the inner space of the lattice column) or chiseling out a small amount of residual concrete, thereby reducing the workload and improving the construction efficiency. Among them, attaching the airbag to the inner surface of the column can prevent the concrete from contacting the inner surface of the column and prevent the concrete from adhering to the inner surface and being difficult to remove. The lattice column strengthens the structural strength of the column through the above-mentioned multiple gusset assemblies arranged at intervals, and multiple columns are connected by gussets to form an inner cavity where concrete can be poured.

[0007] Preferably, at least two of the airbags are provided in the inner cavity of the column, and the two airbags are arranged opposite to each other.

[0008] In this solution, by increasing the number of airbags (two or more), the space that can be filled by the airbags after being inflated can be increased. The two airbags are arranged opposite to each other to form a relative squeezing force to ensure that the concrete between the airbags is squeezed out.

[0009] Preferably, a plurality of the airbags are disposed in the inner cavity of the pillar, and the plurality of the airbags are attached to all inner surfaces of the plurality of the pillars.

[0010] In this solution, multiple air bags are attached to all inner surfaces of multiple columns to ensure that all inner surfaces of the columns are not in contact with concrete, thereby preventing residual concrete from adhering to the inner surfaces and being difficult to remove.

[0011] Preferably, each of the airbags is connected to an air intake pipe, which is disposed in an inner cavity of the column and communicated with an inflation device outside the lattice column.

[0012] In this solution, each airbag is connected to an air inlet pipe so that all the airbags can be inflated at the same time, thereby improving the strength of the extruded concrete and preventing some airbags from being inflated in time and being unable to squeeze the concrete out of the inner space of the lattice column before the concrete solidifies.

[0013] A cast-in-place pile structure comprises a steel cage and the lattice column as described above. The part of the lattice column including the airbag is placed in the steel cage and connected to the steel cage.

[0014] In this solution, the cast-in-place pile structure is formed through the above-mentioned lattice column. After the pouring is completed and the cast-in-place pile is formed, it is only necessary to remove the airbag without chiseling the concrete in the inner cavity of the column or chiseling a small amount of residual concrete, which reduces the workload and improves the construction efficiency. Among them, the part of the lattice column including the airbag is placed in the steel cage to ensure that the airbag is immersed in the concrete filled in the steel cage, and to ensure that the airbag can achieve the function of squeezing the concrete after the pouring is completed.

[0015] Preferably, the portion of the lattice column including the airbag is arranged in a top area within the steel cage.

[0016] In this solution, the portion of the lattice column including the airbag (i.e., a section including the airbag) is arranged in the top area of ​​the steel cage. When the airbag is removed, the steel bars exposed above the airbag are shorter or non-existent, and the airbag can be removed without removing the steel bars, thereby reducing the construction workload.

[0017] A method for chiseling out concrete, wherein the method for chiseling out concrete utilizes the lattice column as described above to remove the concrete poured in the lattice column, and the method for chiseling out concrete comprises the following steps:

[0018] Drilling is performed on the ground to form a hole, and a steel cage and the lattice column are placed in the hole; wherein the air bag is in an uninflated contracted state, and the lattice column including a part of the air bag is placed in the steel cage and connected to the steel cage, and the height of the air bag from the bottom of the hole is not lower than a preset elevation for casting the hole;

[0019] Introducing concrete from the inner cavity of the lattice column and pouring the hole until the poured concrete reaches a preset elevation to form a cast-in-place pile;

[0020] Before the concrete solidifies, the airbag is inflated to squeeze the concrete inside the lattice column and outside the surface of the airbag out of the lattice column;

[0021] Excavating a foundation pit from the ground to the preset elevation to form the bottom of the foundation pit, exposing the pile head of the cast-in-place pile, wherein the pile head includes the portion of the lattice column with the air bag;

[0022] The air bag is removed from the lattice column.

[0023] In this scheme, the method of chiseling out concrete can be carried out by using the above-mentioned lattice column with airbags and the above-mentioned operation steps. During the overfilling of the concrete, the airbag can be placed in an uninflated contracted state, and the concrete can enter the inner cavity of the column for pouring; and after the pouring is completed, the airbag is inflated, and the expanded airbag can squeeze the concrete out of the lattice column, so that after the pouring is completed and the cast-in-place pile is formed, it is only necessary to remove the airbag, without chiseling out the concrete in the inner space of the lattice column or chiseling out a small amount of residual concrete, thereby reducing the workload and improving the construction efficiency. Among them, the part of the lattice column including the airbag (i.e., a section including the airbag) is arranged in the steel cage to ensure that the airbag is immersed in the concrete and that the airbag can effectively squeeze the concrete after the pouring is completed. By setting, the height of the airbag from the bottom of the hole is not lower than the preset elevation of the pouring hole, ensuring that after pouring, the airbag is exposed to the bottom surface of the foundation pit, and the airbag can be removed.

[0024] Preferably, a plurality of the airbags are provided in the lattice column, and the step of "inflating the airbags before the concrete solidifies" further comprises: inflating all the airbags simultaneously.

[0025] In this solution, by inflating all the airbags at the same time, the filling space of the airbags can be increased, the inflation efficiency can be improved, and the situation where some airbags are not inflated in time before the concrete solidifies and the concrete cannot be squeezed out of the internal space of the lattice column can be avoided.

[0026] Preferably, the step of "inflating the airbag before the concrete solidifies" further comprises: inflating the airbag to fit tightly against the inner wall of the lattice column.

[0027] In this solution, the airbag is inflated and pressed against the inner wall of the lattice column, ensuring that all the inner walls of the lattice column are not in contact with the concrete, thus preventing the residual concrete from adhering to the inner surface and being difficult to remove.

[0028] Preferably, before the step of "removing the airbag from the lattice column", the step further includes:

[0029] The concrete around the pile head is chiseled off to expose the steel bars of the steel cage at the pile head.

[0030] In this solution, before removing the airbag, the concrete around the pile head is chiseled off, so that there is no obstacle to removing the airbag and damage to the airbag is avoided, which is conducive to multiple uses of the airbag.

[0031] The positive and progressive effects of the present invention are as follows: the lattice column, the cast-in-place pile structure and the method for chiseling out concrete use the airbag in the inner cavity of the column and utilize the contraction characteristics of the airbag, so that during the overfilling of the concrete, the airbag can be placed in an uninflated contracted state, and the concrete can enter the inner cavity of the column for pouring; and after the pouring is completed, the airbag is inflated, and the expanded airbag can squeeze the concrete out of the inner cavity of the column, so that after the pouring is completed and the cast-in-place pile is formed, it is only necessary to remove the airbag without chiseling out the concrete in the inner cavity of the column (that is, the internal space of the lattice column) or chiseling out a small amount of residual concrete, thereby reducing the workload and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the lattice column structure of the uninflated airbag of Example 1 of the present invention.

[0033] Figure 2 This is a schematic diagram of the lattice column structure after the airbag is inflated in Example 1 of the present invention.

[0034] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0035] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction.

[0036] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure along the CC direction.

[0037] Figure 6 This is a schematic structural diagram of the cast-in-place pile structure of Example 2 of the present invention.

[0038] Figure 7 This is a flow chart of the steps of the method for chiseling away concrete according to Example 3 of the present invention.

[0039] Figure 8 This is a schematic diagram of the structure of step S1 in Example 3 of the present invention.

[0040] Fig. 9 This is a schematic diagram of the structure when step S2 of Example 3 of the present invention is being constructed but the cast-in-place has not yet been poured to the preset elevation.

[0041] Fig.10 This is a schematic diagram of the structure when step S2 of Example 3 of the present invention is carried out and poured to a preset elevation position.

[0042] Fig.11 This is a schematic diagram of the structure of step S3 of Example 3 of the present invention.

[0043] Fig.12 This is a structural schematic diagram of the construction of step S4 in Example 3 of the present invention.

[0044] Fig.13 This is a schematic diagram of the structure of performing step S5.1 in Example 3 of the present invention.

[0045] Fig.14 This is a schematic diagram of the structure of performing step S5 in Example 3 of the present invention.

[0046] Description of reference numerals:

[0047] Cast-in-place pile 1

[0048] Hole wall of cast-in-place pile 101

[0049] Steel Cage 2

[0050] Lattice Column 3

[0051] Column 4

[0052] Column cavity 41

[0053] Plate assembly 5

[0054] Plate 51

[0055] Airbag 6

[0056] Intake pipe 7

[0057] Hole 8

[0058] Catheter 9

[0059] Cast-in-place piles 10

[0060] Pit bottom 12

[0061] Pile head 13

[0062] Ground 14 DETAILED DESCRIPTION

[0063] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0064] Example 1

[0065] The present embodiment provides a lattice column 3, which is used for cast-in-place piles in foundation pit construction. When carrying out construction, it is necessary to dig a pit of a certain depth below the ground as the foundation structure of the building. Such a pit is called a foundation pit. Before digging the foundation pit, it is necessary to drill holes on the ground, and concrete is poured into the drilled holes to form bored cast-in-place piles. The bored cast-in-place piles include a steel cage with a lattice column 3 below the lattice column 3, and the lattice column 3 is sleeved in the hole wall 101 of the bored cast-in-place pile. The lattice column 3 is an important component of the foundation pit support.

[0066] like Figure 1-5 As shown, the lattice column 3 includes a plurality of columns 4 and a plurality of plate assemblies spaced apart along the extension direction of the columns 4, each plate assembly includes a plurality of plates 51 connecting the plurality of columns 4, an airbag 6 is provided in the column inner cavity 41 surrounded by the plurality of columns 4, and the airbag 6 is attached to the inner surface of the column 4.

[0067] Specifically, in this embodiment, the column 4 is a long strip of angle steel, and the lattice column 3 includes four columns 4, that is, four angle steels. The gusset plate 51 is a small piece of steel plate welded on the outer surface of the column 4. Each gusset plate assembly includes four gusset plates 51. The four gusset plates 51 connect the four columns 4, and the enclosed column cavity 41 constitutes the internal space of the lattice column 3. The material of the airbag 6 is a soft material, such as rubber; when not inflated, the airbag 6 is attached to the inner surface of the column 4 (i.e., the inner wall of the angle steel) in a contracted state. When inflated, the airbag 6 can be expanded by the gas to squeeze the soft concrete that has not yet solidified out of the lattice column 3.

[0068] The lattice column 3 is provided with an airbag 6 in the column inner cavity 41, and the shrinkage characteristics of the airbag 6 are utilized. During the overfilling of the concrete, the airbag 6 can be placed in an uninflated shrinkage state, and the concrete can enter the column inner cavity 41 for pouring; and after the pouring is completed, the airbag 6 is inflated, and the expanded airbag 6 can squeeze the concrete out of the column inner cavity 41, so that after the pouring is completed and the cast-in-place pile is formed, it is only necessary to remove the airbag 6, and there is no need to chisel out the concrete in the column inner cavity 41 (i.e., the inner space of the lattice column 3) or chisel out a small amount of residual concrete, thereby reducing the workload and improving the construction efficiency. Among them, attaching the airbag 6 to the inner surface of the column 4 can prevent the concrete from contacting the inner surface of the column 4, and prevent the concrete from adhering to the inner surface (because the concrete has a certain degree of adhesion, if it contacts the steel surface of the column 4, it will adhere very firmly) and is not easy to remove. The lattice column 3 has a plurality of intervening plate assemblies, which strengthen the structural strength of the column 4. The plurality of columns 4 are connected by the intervening plates 51 to form an inner cavity for pouring concrete.

[0069] Among them, at least two airbags 6 are provided in the inner cavity 41 of the column, and the two airbags 6 are arranged opposite to each other. In this embodiment, there are four airbags 6, which are distributed on the inner surfaces of the four columns 4 and arranged opposite to each other in pairs. By increasing the number of airbags 6 (two or more), the space that can be filled by the airbags 6 after being inflated can be increased. The two airbags 6 are arranged opposite to each other to form a relative squeezing force to ensure that the concrete between the airbags 6 is squeezed out. In practice, the number of airbags 6 can be increased or decreased as needed, but preferably, the number of airbags 6 is two or a multiple of two, so that the airbags 6 can be arranged in pairs on the inner surface of the lattice column 3, and the symmetrical airbags 6 are easy to squeeze each other, which is convenient for squeezing out the concrete.

[0070] Furthermore, multiple air bags 6 are attached to all inner surfaces of multiple columns 4. In practice, the surfaces of the air bags 6 are attached to all inner surfaces of multiple columns 4 to ensure that all inner wall surfaces of the lattice column 3 are attached with the air bags 6, so as to ensure that all inner surfaces of the columns 4 are not in contact with concrete, and to avoid residual concrete adhering to the inner surface and being difficult to remove.

[0071] Each airbag 6 is connected to an air inlet pipe 7, which is arranged in the inner cavity 41 of the column and connected to the inflation device outside the lattice column 3. By connecting each airbag 6 to an air inlet pipe 7, all the airbags 6 can be inflated at the same time, thereby improving the strength of the extruded concrete and preventing some airbags 6 from being inflated in time and being unable to squeeze the concrete out of the inner space of the lattice column 3 before the concrete solidifies.

[0072] Example 2

[0073] like Figure 6As shown, this embodiment provides a cast-in-place pile 1 structure, which includes a steel cage 2 and a lattice column 3 as in Example 1, the lattice column 3 is integrally sleeved in the hole wall 101 of the cast-in-place pile, and the lattice column 3 includes a part of the airbag 6 placed in the steel cage 2 and connected to the steel cage 2.

[0074] The structure of the cast-in-place pile 1 is formed by the lattice column 3. After the casting is completed and the cast-in-place pile 1 is formed, only the airbag 6 needs to be removed, without chiseling the concrete in the column inner cavity 41 or chiseling a small amount of residual concrete, which reduces the workload and improves the construction efficiency. The part of the lattice column 3 including the airbag 6 is placed in the steel cage 2 to ensure that the airbag 6 is immersed in the concrete filled in the steel cage 2, and to ensure that the airbag 6 can achieve the function of squeezing the concrete after the casting is completed.

[0075] The portion of the lattice column 3 including the airbag 6 (i.e., a section including the airbag 6) is arranged in the top area of ​​the steel cage 2. In this way, when the airbag 6 is removed, the steel bars exposed above the airbag 6 are shorter or non-existent, and the airbag 6 can be removed without removing the steel bars, thereby reducing the construction workload.

[0076] Example 3

[0077] This embodiment provides a method for chiseling out concrete, which uses the lattice column 3 of embodiment 1 or the cast-in-place pile 1 structure of embodiment 2 to remove the concrete poured in the lattice column 3. Figure 7 As shown, the method for chiseling out concrete comprises the following steps:

[0078] S1. Drilling is performed on the ground 14 to form a hole 8, and a steel cage 2 and a lattice column 3 are placed in the hole 8; wherein the airbag 6 is in an uninflated contracted state, and the lattice column 3 including a part of the airbag 6 is placed in the steel cage 2 and connected to the steel cage 2, and the height of the airbag 6 from the bottom of the hole 8 is not lower than the preset elevation of the casting hole 8;

[0079] S2, concrete is introduced into the inner cavity of the lattice column 3, and the hole 8 is poured until the poured concrete reaches a preset elevation to form a cast-in-place pile 1; in this embodiment, in order to better introduce concrete, a conduit 9 is used, which is inserted from the top of the lattice column 3, passes through the internal space of the lattice column 3, and reaches the bottom of the steel cage 2. The concrete flows from the conduit 9 and is poured into the bottom of the hole 8. There is a cast-in-place pile 10 with a height at the bottom of the hole 8;

[0080] S3, before the concrete solidifies, inflate the airbag 6 to squeeze the concrete inside the lattice column 3 and outside the surface of the airbag 6 out of the lattice column 3;

[0081] S4, excavating a foundation pit from the ground 14 to a preset elevation to form a pit bottom 12 of the foundation pit, exposing the pile head 13 of the cast-in-place pile 1, wherein the pile head 13 includes a portion of the lattice column 3 with the airbag 6;

[0082] S5, removing the airbag 6 from the lattice column 3.

[0083] The method of chiseling concrete can be used by using the lattice column 3 with the airbag 6 and the above-mentioned operation steps. During the overfilling of the concrete, the airbag 6 can be in an uninflated contracted state, and the concrete can enter the column inner cavity 41 for pouring; and after the pouring is completed, the airbag 6 is inflated, and the expanded airbag 6 can squeeze the concrete out of the lattice column 3, so that after the pouring is completed and the cast-in-place pile 1 is formed, it is only necessary to remove the airbag 6, without chiseling the concrete in the internal space of the lattice column 3 or chiseling a small amount of residual concrete, thereby reducing the workload and improving the construction efficiency. Among them, the part of the lattice column 3 including the airbag 6 (i.e., a section including the airbag 6) is arranged in the steel cage 2, ensuring that the airbag 6 is immersed in the concrete, and ensuring that the airbag 6 can effectively squeeze the concrete after the pouring is completed. By setting, the height of the airbag 6 from the bottom of the hole 8 is not lower than the preset elevation of the pouring hole 8, ensuring that after pouring, the airbag 6 is exposed to the surface of the pit bottom 12 of the foundation pit, and the airbag 6 can be removed.

[0084] There are multiple airbags 6 in the lattice column 3, so the above step S3 "inflate the airbags 6 before the concrete solidifies" also includes: simultaneously inflate all the airbags 6. By inflating all the airbags 6 at the same time, the filling space of the airbags 6 can be increased, the inflation efficiency can be improved, and it is avoided that before the concrete solidifies, some airbags 6 are not inflated in time and cannot squeeze the concrete out of the internal space of the lattice column 3.

[0085] The above step S3 of "inflating the airbag 6 before the concrete solidifies" also includes: inflating the airbag 6 to fit closely against the inner wall of the lattice column 3. For a better squeezing effect, the inflation pressure of the airbag 6 can be appropriately increased to ensure that all inner walls of the lattice column 3 are not in contact with the concrete, so as to avoid residual concrete adhering to the inner surface and being difficult to remove.

[0086] Before the step S5 of "removing the airbag 6 from the lattice column 3", the step S5.1 is also included: chiseling away the concrete around the pile head 13 to expose the steel bars of the steel cage 2 at the pile head 13. Before removing the airbag 6, by chiseling away the concrete around the pile head 13, there is no obstacle to removing the airbag 6, and damage to the airbag 6 is avoided, which is conducive to multiple use of the airbag 6.

[0087] Figure 8-Figure 14 A schematic diagram showing the construction process when performing each step of the above method is shown.

[0088] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A lattice column, used for cast-in-place piles in foundation pit construction, the lattice column comprising a plurality of columns and a plurality of plate assemblies spaced apart along the extending direction of the columns, each of the plate assemblies comprising a plurality of plates connecting the plurality of columns, characterized in that: An air bag is arranged in the inner cavity of the column surrounded by the plurality of columns, and the air bag is attached to the inner surface of the column.

2. The lattice column according to claim 1, characterized in that: At least two air bags are arranged in the inner cavity of the column, and the two air bags are arranged opposite to each other.

3. The lattice column according to claim 1, characterized in that: A plurality of the air bags are arranged in the inner cavity of the pillar, and the plurality of the air bags are attached to all inner surfaces of the plurality of the pillars.

4. The lattice column according to claim 2 or 3, characterized in that: Each of the airbags is connected to an air intake pipe, which is arranged in the inner cavity of the column and communicated with an inflation device outside the lattice column.

5. A cast-in-place pile structure, comprising a steel cage, characterized in that: The cast-in-place pile structure further comprises a lattice column as claimed in any one of claims 1 to 4, wherein the portion of the lattice column including the airbag is placed in the steel cage and connected to the steel cage.

6. The cast-in-place pile structure according to claim 5, characterized in that: The portion of the lattice column including the airbag is disposed in a top region within the steel cage.

7. A method for chiseling concrete, characterized in that: The method for removing concrete utilizes the lattice column according to any one of claims 1 to 4 to remove the concrete poured in the lattice column, and the method for removing concrete comprises the following steps: Drilling is performed on the ground to form a hole, and a steel cage and the lattice column are placed in the hole; wherein the airbag is in an uninflated contracted state, the portion of the lattice column including the airbag is placed in the steel cage and connected to the steel cage, and the height of the airbag from the bottom of the hole is not lower than a preset elevation for casting the hole; Introducing concrete from the inner cavity of the lattice column and pouring the hole until the poured concrete reaches a preset elevation to form a cast-in-place pile; Before the concrete solidifies, the airbag is inflated to squeeze the concrete inside the lattice column and outside the surface of the airbag out of the lattice column; Excavating a foundation pit from the ground to the preset elevation to form the bottom of the foundation pit, exposing the pile head of the cast-in-place pile, wherein the pile head includes the portion of the lattice column with the air bag; The air bag is removed from the lattice column.

8. The method for removing concrete according to claim 7, characterized in that: A plurality of the airbags are provided in the lattice column, and the step of "inflating the airbags before the concrete solidifies" further includes: inflating all the airbags at the same time.

9. The method for removing concrete according to claim 7, characterized in that: The step of "inflating the airbag before the concrete solidifies" also includes: inflating the airbag to fit tightly against the inner wall of the lattice column.

10. The method for removing concrete according to claim 7, characterized in that: Before the step of "removing the airbag from the lattice column", the following steps are also included: The concrete around the pile head is chiseled off to expose the steel bars of the steel cage at the pile head.

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