Construction method for removing tool column during pouring of concrete in bored pile

Abstract

The present application relates to the technical field of cast-in-place pile, and discloses a construction method for removing a tool column in a process of pouring concrete into a cast-in-place pile, which comprises a pile hole, a column body formed by connecting a steel pipe column and the tool column, sinking the column body in the pile hole, forming a lower ring cavity between the steel pipe column and the inner side wall of the pile hole, and forming an upper ring cavity between the tool column and the inner side wall of the pile hole, a pressure relief hole arranged in the lower part of the tool column, pouring concrete to form a pile body of the cast-in-place pile, filling the lower ring cavity with gravel, pouring concrete into the steel pipe cavity to form a steel pipe pile, and pumping out the mud in the tool cavity until the height of the mud in the upper ring cavity and the height of the mud in the tool cavity are respectively horizontally flush with the pressure relief hole. During the pumping process, the mud outside the tool column is synchronously pumped through the pressure relief hole, effectively reducing the water head pressure outside the tool column, and avoiding the phenomenon that the mud outside the tool column instantaneously flows into the tool column when the construction personnel enters the tool column to remove the connection between the tool column and the steel pipe column.

Description

Technical Field

[0001] This invention patent relates to the technical field of cast-in-place piles, and more specifically, to a construction method for removing tool columns during the concrete pouring process of cast-in-place piles. Background Technology

[0002] The reverse construction method for steel pipe column 20 typically involves a combination of steel pipe column 20 and cast-in-place piles. To meet the positioning requirements at the borehole opening, bolts are usually used to connect tool column 10 to steel pipe column 20, and tool column 10 is used to position steel pipe column 20. When the positioning of steel pipe column 20 uses the pre-insertion method, the construction usually begins with drilling the cast-in-place pile and using mud 40 for wall protection. Then, using a full-casing full-rotation drilling rig 30, the tool column 10 and steel pipe column 20 are lowered to the designed elevation of the top of the cast-in-place pile. At this point, the borehole and the steel pipe column 20 and tool column 10 are filled with mud 40. See details below. Figure 1 Then, a guide pipe is lowered into the steel pipe column 20. First, 70% of the pile body concrete is poured to the pile top elevation of 50%. Then, 80% of crushed stone is backfilled between the steel pipe column 20 and the borehole wall. Finally, 70% of the concrete inside the steel pipe column 20 is poured to the top elevation of the steel pipe column of 60%. At this point, the mud 40 fills the tool column 10 and its outer side. Approximately 24 hours after the pouring is completed, the mud 40 inside the tool column 10 is pumped out using the mud pump 11. See details below. Figure 2 .

[0003] In the existing technology, after the mud 40 is emptied, when the construction personnel enter the tool column 10 to disassemble the connection between the steel pipe column 20 and the tool column 10, the mud 40 between the tool column 10 and the borehole wall is subjected to the pressure of the hydraulic head difference H formed by the surrounding groundwater (groundwater level 90). When the connection between the tool column 10 and the steel pipe column 20 is broken, the mud 40 rushes into the tool column 10 through the gap. Due to the sudden pressure relief, a large amount of mud 40 may rush into the tool column 10 instantaneously, causing the danger of mud 40 gushing out and threatening the safety of the construction personnel inside the column. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for removing tool columns during the concrete pouring process of cast-in-place piles. This method aims to solve the problem in the prior art where, after construction workers enter the tool column and disconnect it from the steel pipe column, mud from outside the tool column instantly rushes into the tool column, threatening the safety of the construction workers inside.

[0005] This invention is implemented as follows: a construction method for removing the tool column during the concrete pouring process of a cast-in-place pile includes the following construction steps:

[0006] 1) Constructing and forming pile holes, connecting steel pipe columns and tool columns into one body to form a column, with the bottom of the tool column abutting the top of the steel pipe column; the steel pipe column has a steel pipe cavity inside, and the tool column has a tool cavity inside, with the tool cavity and the steel pipe cavity communicating vertically.

[0007] 2) The column, which is connected as one piece, is lowered into the pile hole until the bottom of the steel pipe column reaches the set position of the pile hole. There is a pile body gap between the bottom of the steel pipe column and the bottom of the pile hole, and the top of the tool column extends to the top of the pile hole.

[0008] The steel pipe column and the inner wall of the pile hole form an annular lower cavity, and the tool column and the inner wall of the pile hole form an annular upper cavity; a pressure relief hole is provided in the lower part of the tool column, and the pressure relief hole connects the upper cavity and the tool cavity.

[0009] 3) Concrete is poured into the pile body interval to form the pile body of the cast-in-place pile, and the bottom of the steel pipe column has an embedded section embedded in the pile body;

[0010] 4) Fill the lower ring cavity with crushed stone, forming a crushed stone ring in the lower ring cavity; pour concrete into the steel pipe cavity to form a steel pipe pile, and connect the steel pipe pile to the pile body as one piece;

[0011] 5) Use the suction pipe to extract the mud from the tool chamber. The mud in the upper ring chamber enters the tool chamber through the pressure relief hole and is extracted by the suction pipe until the height of the mud in the upper ring chamber and the height of the mud in the tool chamber are level with the pressure relief hole. Then, disassemble the tool column and the steel pipe column and lift the tool column out of the pile hole.

[0012] Optionally, in construction step 1), mud slurry is used to protect the wall during the construction of the pile hole.

[0013] Optionally, in construction step 1), after connecting the steel pipe column and the tool column as a whole outside the pile hole, the column is lowered into the pile hole using a full-rotation drilling rig.

[0014] Optionally, the tool column has a horizontally arranged upper docking ring extending inward from the outer periphery of its bottom, and the tool cavity and the upper docking ring are arranged vertically opposite each other; the steel pipe column has a horizontally arranged lower docking ring extending outward from the outer periphery of its top, and the upper docking ring and the lower docking ring are arranged vertically opposite each other.

[0015] In construction step 1), after the upper and lower connecting rings are aligned vertically, multiple bolts are used to connect the upper and lower connecting rings, thus connecting the steel pipe column and the tool column into one unit.

[0016] Optionally, in construction step 5), after the height of the mud in the upper ring cavity and the height of the mud in the tool cavity are level with the pressure relief hole, after a set time of settling, the tool column and the steel pipe column are disassembled and separated inside the tool cavity.

[0017] Optionally, in construction step 4), the top of the crushed stone ring extends beyond the bottom of the tool column to form a wrapping section extending into the upper ring cavity. The wrapping section wraps around the lower outer periphery of the tool column, and the top of the wrapping section is flush with the bottom of the pressure relief hole.

[0018] Optionally, in construction step 3), before pouring concrete into the pile body gap, a reinforcing cage is lowered into the pile body gap, and the embedded section passes through the top of the reinforcing cage from top to bottom and is inserted into the upper part of the reinforcing cage.

[0019] Optionally, the pressure relief hole is provided with an isolation mesh, and the isolation mesh has multiple mesh holes.

[0020] Optionally, the upper docking ring is provided with an inner ring wall, which is arranged around the circumference of the tool post. The bottom of the inner ring wall is docked with the upper docking ring, and the top of the inner ring wall extends upward.

[0021] The tool column is provided with a plurality of pressure relief holes, which are arranged at intervals around the circumference of the tool column; a transition annular cavity is arranged between the inner annular wall and the inner sidewall of the tool column, and the transition annular cavity is connected to the upper annular cavity through the pressure relief holes; a plurality of pressure dividing holes are provided in the inner annular wall, which are arranged at intervals around the circumference of the inner annular wall, and the diameter of the pressure dividing holes is smaller than the diameter of the pressure relief holes; the top of the inner annular wall is arranged higher than the top of the pressure relief holes.

[0022] Optionally, in construction step 5), the bottom of the suction tube extends to the bottom of the upper annular cavity, and the top of the suction tube extends out of the tool cavity and is connected to the suction pump.

[0023] The bottom of the suction tube extends outward with multiple curved tubes, which are arranged at intervals around the bottom of the suction tube. The inner ends of the curved tubes converge and connect to the bottom of the suction tube and communicate with it. The outer ends of the curved tubes bend upward to form an upward-facing suction port, which is horizontally aligned with the pressure relief hole.

[0024] The curved tube bends downwards and protrudes in the middle to form a protruding section, which is lower than the bottom of the suction tube. The bottom of the protruding section has a bottom hole with a diameter smaller than that of the suction port. An elastic membrane tube is connected to the bottom hole. The outer periphery of the upper end of the membrane tube is abutted against the inner wall of the bottom hole. The lower end of the membrane tube extends outwards and forms an elastic opening that communicates with the interior of the curved tube.

[0025] In construction step 5), during the process of the suction pump drawing mud from the tool chamber and the upper ring chamber through the suction pipe, the mud in the upper ring chamber enters the tool chamber through the pressure relief hole, the mud in the tool chamber enters the curved pipe from top to bottom through the suction port, and is discharged through the suction pipe, and the mud below the protruding section enters the curved pipe through the elastic opening.

[0026] Compared with the prior art, the construction method for removing the tool column during the concrete pouring process of the cast-in-place pile provided by the present invention allows the mud outside the tool column to be simultaneously sucked out through the pressure relief hole during the suction process, which effectively reduces the water head pressure outside the tool column and avoids the phenomenon of mud outside the tool column rushing into the tool column instantly when construction personnel enter the tool column to remove the connection between the tool column and the steel pipe column, thus eliminating construction safety hazards. Attached Figure Description

[0027] Figure 1 This is a construction diagram of the reverse construction method for steel pipe columns provided by the present invention.

[0028] Figure 2 This is a construction diagram of the reverse construction method for steel pipe columns provided by the present invention.

[0029] Figure 3 This is a construction diagram of the reverse construction method for steel pipe columns provided by the present invention;

[0030] Figure 4 This is a cross-sectional schematic diagram of the tool post provided by the present invention;

[0031] Figure 5 This is a partial schematic diagram of the suction tube provided by the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0034] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] Reference Figure 1-5 The image shown is a preferred embodiment of the present invention.

[0036] The construction method for removing the tool column 10 during the concrete pouring process of a cast-in-place pile provided by the present invention is characterized by including the following construction steps:

[0037] 1) Constructing and forming pile holes, connecting steel pipe column 20 and tool column 10 into one body to form a column, with the bottom of tool column 10 connected to the top of steel pipe column 20; steel pipe column 20 has a steel pipe cavity inside, tool column 10 has a tool cavity inside, and the tool cavity and steel pipe cavity are connected vertically.

[0038] 2) The column connected as one piece is lowered into the pile hole until the bottom of the steel pipe column 20 reaches the set position of the pile hole. There is a pile body 200 gap between the bottom of the steel pipe column 20 and the bottom of the pile hole. The top of the tool column 10 extends to the top of the pile hole.

[0039] The steel pipe column 20 and the inner wall of the pile hole form an annular lower cavity, and the tool column 10 and the inner wall of the pile hole form an annular upper cavity; a pressure relief hole 101 is provided in the lower part of the tool column 10, and the pressure relief hole 101 connects the upper cavity and the tool cavity.

[0040] 3) Concrete is poured into the pile body 200 to form the pile body 200 of the cast-in-place pile. The bottom of the steel pipe column 20 has an embedded section embedded in the pile body 200.

[0041] 4) Fill the lower ring cavity with crushed stone, and the crushed stone forms a crushed stone ring 81 in the lower ring cavity; pour concrete into the steel pipe cavity to form a steel pipe pile 400, and connect the steel pipe pile 400 with the pile body 200 as one unit.

[0042] 5) Use the suction pipe 300 to extract the mud 40 from the tool chamber. The mud 40 in the upper ring chamber enters the tool chamber through the pressure relief hole 101 and is extracted by the suction pipe 300 until the height of the mud 40 in the upper ring chamber and the height of the mud 40 in the tool chamber are level with the pressure relief hole 101. Then, disassemble the tool column 10 and the steel pipe column 20 and lift the tool column 10 out of the pile hole.

[0043] The above-mentioned construction method for removing the tool column 10 during the concrete pouring process of the cast-in-place pile involves the simultaneous suction of the mud 40 outside the tool column 10 through the pressure relief hole 101 during the suction process of the suction pipe 300. This effectively reduces the water head pressure outside the tool column 10 and avoids the phenomenon that the mud 40 outside the tool column 10 will instantly rush into the tool column 10 when the construction personnel enter the tool column 10 to remove the connection between the tool column 10 and the steel pipe column 20, thus eliminating the construction safety hazard.

[0044] In construction step 1), during the construction of the formed pile hole, 40mm mud slurry is used for wall protection. This prevents the hole from collapsing.

[0045] In construction step 1), after connecting the steel pipe column 20 and the tool column 10 as a whole outside the pile hole, the column is lowered into the pile hole using a full-rotation drilling rig. In this way, by connecting the tool column 10 and the steel pipe column 20 as a whole, the steel pipe column 20 can be lowered to the design elevation of the top of the cast-in-place pile.

[0046] The tool column 10 has a horizontally arranged upper docking ring 110 extending inward from the outer periphery of its bottom, and the tool cavity and the upper docking ring 110 are arranged vertically opposite each other; the steel pipe column 20 has a horizontally arranged lower docking ring extending outward from the outer periphery of its top, and the upper docking ring 110 and the lower docking ring are arranged vertically opposite each other.

[0047] In construction step 1), after the upper connecting ring 110 and the lower connecting ring are aligned vertically, multiple bolts are used to connect the upper connecting ring 110 and the lower connecting ring, thus connecting the steel pipe column 20 and the tool column 10 into one unit. In this way, the tool column 10 and the steel pipe column 20 are fixed together by bolts. Specifically, the upper connecting ring has mounting holes 111, and the lower connecting ring has bolt holes arranged aligned with the mounting holes 111.

[0048] In construction step 5), after the height of the mud 40 in the upper annular cavity and the height of the mud 40 in the tool cavity are level with the pressure relief hole 101, and after a set set time, the tool column 10 and the steel pipe column 20 are disassembled and separated inside the tool cavity. This prevents insufficient suction and ensures that groundwater is extracted along with the mud 40.

[0049] In construction step 4), the top of the crushed stone ring 81 extends beyond the bottom of the tool column 10, forming a wrapping section extending into the upper ring cavity. The wrapping section wraps around the lower outer periphery of the tool column 10, and the top of the wrapping section is flush with the bottom of the pressure relief hole 101. In this way, subsequent processes require the steel pipe column 20 to be filled with concrete. By filling with crushed stone, it is prevented that the concrete in the pile body 200 outside the steel pipe column 20 will rise when the concrete is poured into the steel pipe column 20. Furthermore, the crushed stone is backfilled to the pressure relief hole 101, ensuring that the material is pumped out as cleanly as possible in one go during subsequent suction.

[0050] In construction step 3), before pouring concrete into the 200mm interval of the pile body, a reinforcing cage is lowered into the 200mm interval of the pile body. The embedded section passes through the top of the reinforcing cage from top to bottom and is inserted into the upper part of the reinforcing cage. In this way, the structure is more compact and the overall strength is higher.

[0051] The pressure relief hole 101 is equipped with an isolation mesh with multiple mesh openings. This prevents large-diameter stones and debris from entering the tool column 10, thus allowing the mud 40 to be smoothly extracted.

[0052] In this embodiment, the upper docking ring 110 is provided with an inner ring wall 120, which is arranged around the tool post 10 in a circumferential manner. The bottom of the inner ring wall 120 is docked with the upper docking ring 110, and the top of the inner ring wall 120 extends upward.

[0053] The tool column 10 is provided with a plurality of pressure relief holes 101, which are arranged at intervals around the circumference of the tool column 10; there is a transition annular cavity between the inner annular wall 120 and the inner sidewall of the tool column 10, which is connected to the upper annular cavity through the pressure relief holes 101; the inner annular wall 120 is provided with a plurality of pressure dividing holes 121, which are arranged at intervals around the circumference of the inner annular wall 120, and the diameter of the pressure dividing holes 121 is smaller than the diameter of the pressure relief holes 101; the top of the inner annular wall 120 is arranged higher than the top of the pressure relief holes 101.

[0054] Through the design of the inner ring wall 120, when the external mud 40 flows into the tool column 10, it enters the annular transition ring cavity. After the pressure reaches a balance value, it continues to flow radially inward through the pressure dividing hole 121 set on the inner ring wall 120, so that the external mud 40 can flow in relatively smoothly. At the same time, when the water level is at the pressure relief hole 101, since the suction pipe 300 cannot completely suck it out, the transition ring cavity can play the role of storing some mud 40, thus preventing this small amount of mud 40 from accumulating on the steel pipe pile 400.

[0055] In this embodiment, in construction step 5), the bottom of the suction tube 300 extends to the bottom of the upper annular cavity, and the top of the suction tube 300 extends out of the tool cavity and is connected to the suction pump 11.

[0056] The bottom of the suction tube 300 extends outward with multiple curved tubes 310, which are arranged at intervals around the bottom of the suction tube 300. The inner ends of the curved tubes 310 converge and connect to the bottom of the suction tube 300 and communicate with the suction tube 300. The outer ends of the curved tubes 310 bend upward to form an upward-facing suction port, which is horizontally aligned with the pressure relief hole 101.

[0057] The middle part of the curved tube 310 bends downward and protrudes to form a protruding section 311, which is lower than the bottom of the suction tube 300. The bottom of the protruding section 311 is provided with a bottom hole, the diameter of which is smaller than the diameter of the suction port. An elastic membrane tube 320 is connected to the bottom hole. The outer periphery of the upper end of the membrane tube 320 is abutted against the inner wall of the bottom hole. The lower end of the membrane tube 320 extends outward and forms an elastic opening at the lower end of the membrane tube 320. The elastic opening communicates with the interior of the curved tube 310.

[0058] In construction step 5), during the process of the suction pump 11 drawing mud 40 from the tool chamber and the upper annular chamber through the suction pipe 300, the mud 40 in the upper annular chamber enters the tool chamber through the pressure relief hole 101. The mud 40 in the tool chamber enters the curved pipe 310 from top to bottom through the suction port and is discharged through the suction pipe 300. The mud 40 below the protruding section 311 enters the curved pipe 310 through the elastic opening. In this way, when the water level in the tool column 10 is above the suction port, the mud 40 can be drawn out of the tool column 10 through the suction port and the elastic opening. When the water level is low, the remaining small amount of mud 40 can be effectively drawn out through the elastic opening.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for removing tool columns during the concrete pouring process of cast-in-place piles, characterized in that, The construction steps include the following: 1) Constructing and forming pile holes, connecting steel pipe columns and tool columns into one body to form a column, with the bottom of the tool column abutting the top of the steel pipe column; the steel pipe column has a steel pipe cavity inside, and the tool column has a tool cavity inside, with the tool cavity and the steel pipe cavity communicating vertically. 2) The column, which is connected as one piece, is lowered into the pile hole until the bottom of the steel pipe column reaches the set position of the pile hole. There is a pile body gap between the bottom of the steel pipe column and the bottom of the pile hole, and the top of the tool column extends to the top of the pile hole. The steel pipe column and the inner wall of the pile hole form an annular lower cavity, and the tool column and the inner wall of the pile hole form an annular upper cavity; a pressure relief hole is provided in the lower part of the tool column, and the pressure relief hole connects the upper cavity and the tool cavity. 3) Concrete is poured into the pile body interval to form the pile body of the cast-in-place pile, and the bottom of the steel pipe column has an embedded section embedded in the pile body; 4) Fill the lower ring cavity with crushed stone, forming a crushed stone ring in the lower ring cavity; pour concrete into the steel pipe cavity to form a steel pipe pile, and connect the steel pipe pile to the pile body as one piece; 5) Use the suction pipe to extract the mud from the tool chamber. The mud in the upper ring chamber enters the tool chamber through the pressure relief hole and is extracted by the suction pipe until the height of the mud in the upper ring chamber and the height of the mud in the tool chamber are level with the pressure relief hole. Then, disassemble the tool column and the steel pipe column and lift the tool column out of the pile hole. The tool column has a horizontally arranged upper docking ring extending inward from the outer periphery of its bottom. The tool cavity and the upper docking ring are arranged vertically opposite each other. The upper docking ring is provided with an inner ring wall, which is arranged around the circumference of the tool column. The bottom of the inner ring wall is docked to the upper docking ring, and the top of the inner ring wall extends upward. The tool column is provided with a plurality of pressure relief holes, which are arranged at intervals around the circumference of the tool column; a transition annular cavity is provided between the inner annular wall and the inner sidewall of the tool column, and the transition annular cavity is connected to the upper annular cavity through the pressure relief holes; a plurality of pressure dividing holes are provided in the inner annular wall, which are arranged at intervals around the circumference of the inner annular wall, and the diameter of the pressure dividing holes is smaller than the diameter of the pressure relief holes; the top of the inner annular wall is arranged higher than the top of the pressure relief holes; In construction step 5), the bottom of the suction tube extends to the bottom of the upper ring cavity, and the top of the suction tube extends out of the tool cavity and is connected to the suction pump. The bottom of the suction tube extends outward with multiple curved tubes, which are arranged at intervals around the bottom of the suction tube. The inner ends of the curved tubes converge and connect to the bottom of the suction tube and communicate with it. The outer ends of the curved tubes bend upward to form an upward-facing suction port, which is horizontally aligned with the pressure relief hole. The curved tube bends downwards and protrudes in the middle to form a protruding section, which is lower than the bottom of the suction tube. The bottom of the protruding section has a bottom hole with a diameter smaller than that of the suction port. An elastic membrane tube is connected to the bottom hole. The outer periphery of the upper end of the membrane tube is abutted against the inner wall of the bottom hole. The lower end of the membrane tube extends outwards and forms an elastic opening that communicates with the interior of the curved tube. In construction step 5), during the process of the suction pump drawing mud from the tool chamber and the upper ring chamber through the suction pipe, the mud in the upper ring chamber enters the tool chamber through the pressure relief hole, the mud in the tool chamber enters the curved pipe from top to bottom through the suction port, and is discharged through the suction pipe, and the mud below the protruding section enters the curved pipe through the elastic opening.

2. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, In construction step 1), mud slurry is used to protect the pile wall during the construction and forming of the pile hole.

3. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, In construction step 1), after connecting the steel pipe column and the tool column together as one unit outside the pile hole, the column is lowered into the pile hole using a full-rotation drilling rig.

4. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, The top of the steel pipe column has a horizontally arranged lower connecting ring extending outward from the outer periphery, and the upper connecting ring and the lower connecting ring are arranged facing each other vertically. In construction step 1), after the upper and lower connecting rings are aligned and connected, multiple bolts are used to pass through the upper and lower connecting rings to connect the steel pipe column and the tool column into one unit.

5. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, In construction step 5), after the mud height in the upper ring cavity and the mud height in the tool cavity are level with the pressure relief hole, and after a set time of set time, the tool column and the steel pipe column are disassembled and separated inside the tool cavity.

6. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, In construction step 4), the top of the crushed stone ring extends beyond the bottom of the tool column, forming a wrapping section that extends into the upper ring cavity. The wrapping section wraps around the lower outer periphery of the tool column, and the top of the wrapping section is flush with the bottom of the pressure relief hole.

7. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, In construction step 3), before pouring concrete into the pile body gap, a steel cage is lowered into the pile body gap, and the embedded section passes through the top of the steel cage from top to bottom and is inserted into the upper part of the steel cage.

8. The construction method for removing the tool column during the concrete pouring process of a cast-in-place pile as described in claim 1, characterized in that, The pressure relief hole is equipped with an isolation mesh, and the isolation mesh has multiple mesh openings.

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