Cement mixing pile and construction method

Abstract

The application relates to the technical field of soft soil foundation treatment, in particular to a cement mixing pile and a construction method, which comprises a standing pipe body, the outer side of the standing pipe body is connected with a cement mixing body; an outer protruding block is connected with the cement mixing body; an arc-shaped sealing strip is coaxially arranged with the standing pipe body, a containing cavity is arranged on the standing pipe body, the arc-shaped sealing strip is rotationally connected with the standing pipe body and can block the containing cavity, the arc-shaped sealing strip is connected with the outer protruding block through the cement mixing body; a control unit is installed on the standing pipe body and is used for controlling the rotation angle of the arc-shaped sealing strip; the application has the effects that the rotation angle of the arc-shaped sealing strip can be conveniently controlled through the control unit, the arc-shaped sealing strip can keep the sealing property of the standing pipe body when the arc-shaped sealing strip is lowered, the resistance during lowering can be reduced, the arc-shaped sealing strip can be stretched out during concrete pouring, the possibility that the outer protruding block is separated from the cement mixing body under load can be reduced, and the use reliability of the cement mixing pile is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of soft soil foundation treatment, in particular to a cement mixing pile and a construction method. BACKGROUND

[0002] In order to guarantee the service life of a road surface, it is necessary to reduce foundation settlement, in China, the foundation in some plain areas is mainly silty clay, and the special foundation along a line is mainly soft soil, in order to solve the problem of insufficient foundation strength caused by soft soil, a technology of treating the foundation by cement mixing piles is provided, which is to forcibly mix soft soil and cement in the deep part of the foundation by a special deep mixing machine, so that the soft soil is hardened to improve the strength of the foundation.

[0003] The conventional cement mixing pile is easy to slide relative to soft soil when bearing vertical load due to the smooth outer surface of the pile body, in order to solve the problem, a diameter-expanded cement mixing pile-precast pile foundation is disclosed in the prior art, which comprises a precast concrete pile and a cement mixing pile wrapped outside the precast concrete pile, and the cement mixing pile is expanded in diameter at the middle part and the pile end in the soft soil layer section and forms at least two first expanded sections and one second expanded section arranged at intervals; wherein the outer diameter of the cement mixing pile is 1.05-1.1 times the outer diameter of the precast concrete pile; the outer diameter of the first expanded section is 1.2-2 times the outer diameter of the precast concrete pile; and the outer diameter of the second expanded section is 1.5-2.5 times the outer diameter of the precast concrete pile.

[0004] In the related technology in the above, in the construction process of the cement mixing pile, a molding cavity required for forming the expanded section is first stirred on the ground by a rotary drilling tool, then concrete is poured, and after the concrete is solidified, it adheres to the outer surface of the cement mixing pile, but after the cement and soft soil are mixed and solidified, the strength and adhesion of the cement mixing pile decrease, so that the expanded section is easy to separate from the cement mixing pile when stressed, thereby affecting the use reliability of the overall foundation strengthening structure. SUMMARY

[0005] In order to improve the use reliability of the cement mixing pile, the application provides a cement mixing pile and a construction method.

[0006] The cement mixing pile provided by the application adopts the following technical scheme:

[0007] In a first aspect, the application provides a cement mixing pile, which comprises

[0008] A supporting pipe body is connected with a cement mixing body on the outer side of the supporting pipe body;

[0009] A plurality of outer protrusions are connected with the cement mixing body, and the plurality of outer protrusions are distributed along the axial direction of the stand pipe body;

[0010] A plurality of arc-shaped sealing strips are coaxially arranged on the stand pipe body, a plurality of accommodating cavities are formed on the stand pipe body, the arc-shaped sealing strips are rotationally connected with the stand pipe body and can seal the accommodating cavities, and the arc-shaped sealing strips are connected with the outer protrusions through the cement mixing body;

[0011] A plurality of control units are installed on the stand pipe body, and the control units are connected with the arc-shaped sealing strips and used for controlling the rotation angle of the arc-shaped sealing strips.

[0012] By adopting the above technical scheme, the pile foundation hole is first excavated at the specified position by using the rotary drilling tool, and then the forming cavity is excavated by using the reaming tool, and then before the prefabricated stand pipe body is placed into the pile foundation hole, the control unit is adjusted in advance to make the arc-shaped sealing strip seal the accommodating cavity on the stand pipe body, so that the stand pipe body as a whole has no protruding part, the sinking pressure of the stand pipe body is reduced, and then the stand pipe body is lowered until the stand pipe body is placed in place, and then the control unit is adjusted to apply force to the arc-shaped sealing strip, the arc-shaped sealing strip extends into the forming cavity through the accommodating cavity, and then concrete is poured into the gap between the inner wall of the stand pipe body and the pile foundation hole, the concrete flows into the forming cavity under the action of its own gravity and covers the arc-shaped sealing strip, and after the concrete solidifies, the cement mixing body and the outer protrusion are formed, and the concrete enters the inside of the stand pipe body through the accommodating cavity to fill the hollow inside the stand pipe body. The cement mixing pile is designed, the control unit is installed through the stand pipe body, and the stand pipe body serves as the main support and reinforcement structure of the cement mixing body. Through the cement mixing body, the friction with the soft soil layer can be improved in cooperation with the outer protrusion, so as to improve the position stability and bearing capacity of the cement mixing pile as a whole. The rotation angle of the arc-shaped sealing strip is controlled through the control unit, so as to maintain the sealing property of the stand pipe body during the lowering of the stand pipe body, reduce the resistance during the lowering, and realize the extension of the arc-shaped sealing strip during the pouring of the concrete, so as to simultaneously bury the arc-shaped sealing strip in the cement mixing body and the outer protrusion, improve the connection strength of the outer protrusion and the cement mixing body, reduce the possibility of the outer protrusion being separated from the cement mixing body under the load, and improve the use reliability of the cement mixing pile.

[0013] In a specific embodiment, the control unit comprises

[0014] A mounting strip is connected with the inner wall of the stand pipe body at both ends, and a drive gear is rotationally connected to the mounting strip, and the drive gear is coaxially arranged on the stand pipe body;

[0015] At least one control rack, one end of the control rack is rotatably connected with one end of the arc-shaped closed strip, and the control rack is engaged with the drive gear;

[0016] An abutting spring, one end of the abutting spring is connected with the inner wall of the stand pipe body, and the other end of the abutting spring is abutted with the control rack on the side away from the drive gear;

[0017] A driving member, the driving member is installed on the mounting strip, and the driving member is connected with the drive gear for rotating the drive gear.

[0018] By adopting the above technical scheme, after the stand pipe body is installed in place, the driving member is adjusted, the driving member drives the drive gear to rotate, the drive gear is engaged with the control rack, the control rack is moved, and the arc-shaped closed strip is moved at the same time because one end of the control rack is rotatably connected with the arc-shaped closed strip and the arc-shaped closed strip is pressed on the drive gear by the abutting spring, until the arc-shaped closed strip passes through the containing cavity and enters the forming cavity; the control unit is designed, the drive gear is conveniently installed through the mounting strip, the drive gear is conveniently controlled to rotate through the driving member, the movement of the control rack is conveniently realized through the drive gear, and the movement of the arc-shaped closed strip is conveniently realized through the control rack in cooperation with the abutting spring, so that the arc-shaped closed strip extends into the forming cavity.

[0019] In a specific implementation, a guide sleeve is arranged outside the abutting spring, one end of the guide sleeve is connected with the inner wall of the stand pipe body, and a gap for the control rack to pass through is left between the other end of the guide sleeve and the drive gear.

[0020] By adopting the above technical scheme, the guide sleeve is designed to facilitate the control of the elastic force exertion direction of the abutting spring, and the possibility of disengagement of the control rack and the drive gear is reduced.

[0021] In a specific implementation, the mounting strip is located below the arc-shaped closed strip, and a sliding gap is left between the top wall of the mounting strip and the arc-shaped closed strip.

[0022] By adopting the above technical scheme, the mounting strip designed to be located below the arc-shaped closed strip can provide support for the area of the arc-shaped closed strip inside the stand pipe body when the cement mixing pile is subjected to load in the later stage.

[0023] In a specific implementation, the driving member includes

[0024] A square rod, the square rod is hollow, the square rod is connected with the drive gear, and the square rod is arranged staggered with the mounting strip.

[0025] By adopting the above technical scheme, the driving member is designed, and the square rod facilitates the synchronous rotation of multiple drive gears in cooperation with the external long rod.

[0026] In one specific implementation, the square rod is integrally connected with a flared section, the flared section is above the driving gear, the square rod is directly below the flared section, and the flared section cavity is in communication with the square rod cavity.

[0027] By adopting the above technical scheme, the flared section is designed, and the long rod of the external device is inserted into the square rod.

[0028] In one specific implementation, the thickness of the arc-shaped closure strip gradually increases from the center to the upper and lower ends.

[0029] By adopting the above technical scheme, the thickness-gradually-changing arc-shaped closure strip is designed, and the connection stability between the arc-shaped closure strip and the concrete constituting the external protrusion can be improved.

[0030] In a second aspect, the application provides a cement mixing pile construction method, comprising

[0031] S1: pile foundation hole and forming cavity are opened;

[0032] S2: the pipe body is embedded: the control unit is adjusted to make the arc-shaped closure strip close the accommodating cavity on the pipe body, and then the pipe body is placed into the pile foundation hole;

[0033] S3: the reinforcing structure is extended: the control unit is adjusted again to make the arc-shaped closure strip rotate the plate and extend one end through the accommodating cavity into the forming cavity;

[0034] S4: concrete pouring: concrete is injected into the gap between the pile foundation hole and the pipe body, and a cement mixing body is formed after solidification, and the concrete is solidified in the forming cavity to form an external protrusion.

[0035] By adopting the above technical scheme, the cement mixing pile construction method is designed, the position of the arc-shaped closure strip can be changed when the pipe body is lowered and the concrete is poured, the resistance when the pipe body is lowered is reduced, the internal connection structure is provided for the cement mixing body and the external protrusion, the connection stability of the external protrusion and the cement mixing body is improved, and the overall load bearing capacity of the cement mixing pile is improved.

[0036] In one specific implementation, in step S3, the arc-shaped closure strip is driven to rotate back and forth by the control unit to shovel the collapsed soft soil into the inner cavity of the pipe body.

[0037] By adopting the above technical scheme, the collapsed soft soil can be moved into the inner cavity of the pipe body by the arc-shaped closure strip, and the size of the external protrusion is ensured.

[0038] In one specific implementation, in step S4, concrete is injected into the gap between the pile hole and the stand pipe body, and at the same time, concrete is injected into the inner cavity of the stand pipe body.

[0039] By adopting the technical scheme, the concrete pouring efficiency can be improved, and the possibility of poor cement mixing pile forming quality caused by too small gap between the pile hole and the stand pipe body can be reduced.

[0040] In summary, the present application has at least one of the following beneficial technical effects:

[0041] 1. The cement mixing pile is designed, the control unit is facilitated to be installed through the stand pipe body, and the stand pipe body serves as a main support and reinforcement structure of the cement mixing body, the cement mixing body can cooperate with the outer protrusion to improve the friction with the soft soil layer, thereby improving the position stability and bearing capacity of the cement mixing pile as a whole, the control unit is facilitated to control the rotation angle of the arc-shaped sealing strip, thereby realizing the sealing property of the stand pipe body when the arc-shaped sealing strip is lowered, reducing the resistance during lowering, and realizing the extension of the arc-shaped sealing strip during concrete pouring, thereby embedding the arc-shaped sealing strip in the cement mixing body and the outer protrusion at the same time, improving the connection strength of the outer protrusion and the cement mixing body, reducing the possibility of the outer protrusion being separated from the cement mixing body under load, and improving the use reliability of the cement mixing pile.

[0042] 2. The cement mixing pile is designed, the driving gear is facilitated to be installed through the installation strip, the driving gear is facilitated to be controlled to rotate through the driving member, the movement of the control rack is facilitated to be realized through the driving gear, the movement of the arc-shaped sealing strip is facilitated to be realized through the control rack cooperating with the abutting spring, and the arc-shaped sealing strip is extended into the forming cavity.

[0043] 3. The cement mixing pile is designed, the elastic force application direction of the abutting spring is facilitated to be controlled, and the possibility of the control rack being separated from the driving gear is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a structural diagram of the cement mixing pile after the soft soil is excavated.

[0045] Figure 2 is a structural diagram of the cement mixing pile of the embodiment of the present application.

[0046] Figure 3 is Figure 2 is a structural diagram of the cement mixing pile after the soft soil is excavated.

[0047] Figure 4 is Figure 3 is a top view of

[0048] Figure 5 is Figure 4 is a partial structural diagram of

[0049] Figure 6 is Figure 5 a schematic diagram of a three-dimensional structure.

[0050] Reference signs: 01, pile hole; 02, forming cavity; 1, stand pipe body; 11, containing cavity; 2, cement mixing body; 3, outer protrusion; 4, arc-shaped sealing strip; 5, control unit; 51, mounting strip; 52, driving gear; 53, control rack; 54, abutting spring; 55, driving piece; 551, square rod; 6, guide sleeve; 7, flared section. DETAILED DESCRIPTION

[0051] The following will be combined with the Figures 1-6 The application is further described in detail.

[0052] The application discloses a cement mixing pile and a construction method.

[0053] In a first aspect, the application discloses a cement mixing pile.

[0054] Referring to Figure 1 and Figure 2 , a cement mixing pile includes a stand pipe body 1, a cement mixing body 2, and a plurality of outer protrusions 3. The cement mixing body 2 is connected to the outer peripheral side of the stand pipe body 1, and the plurality of outer protrusions 3 are distributed along the axial direction of the stand pipe body 1. The outer protrusions 3 can be uniformly distributed along the axial direction of the stand pipe body 1, or can not be distributed at equal intervals. The actual working condition can be selected as required, and the outer protrusions 3 are integrally formed with the cement mixing body 2 away from the stand pipe body 1. In the application, a rotary drilling tool is used to excavate a pile hole 01 and a forming cavity 02 at a specified position. The cement mixing body 2 is formed by the concrete solidified in the gap between the stand pipe body 1 and the pile hole 01, and the outer protrusions 3 are formed by the concrete solidified in the forming cavity 02.

[0055] Referring to Figure 3 and Figure 4 , since the solidification strength of the concrete and the soft soil after mixing decreases to a certain extent, in order to improve the connection reliability of the outer protrusions 3 and the cement mixing body 2, a plurality of arc-shaped sealing strips 4 are further included. The arc-shaped sealing strips 4 are coaxially arranged with the stand pipe body 1, and a plurality of containing cavities 11 are formed in the stand pipe body 1. The plurality of containing cavities 11 are distributed along the axial direction of the stand pipe body 1, and the number of the containing cavities 11 in the same height range is at least one. The arc-shaped sealing strips 4 are rotationally connected to the stand pipe body 1 through a pin shaft, the axial direction of the pin shaft is consistent with the axial direction of the stand pipe body 1, and the arc-shaped sealing strips 4 can block the containing cavities 11 after rotation. At this time, the outer arc surface of the arc-shaped sealing strips 4 is coplanar with the outer peripheral side of the stand pipe body 1.

[0056] Referring to Figure 5, in order to facilitate the drive arc-shaped closure strip 4 through the containing cavity 11 into the forming cavity 02, and then as the cement mixing body 2 and the outer protrusion 3 between the connection reinforcing structure after pouring concrete, further comprises a plurality of control units 5, control unit 5 and the stand pipe body 1 is connected, and the control unit 5 and the arc-shaped closure strip 4 are connected, for controlling the rotation angle of the arc-shaped closure strip 4.

[0057] Referring to Figure 5 , in order to improve the connection stability between the arc-shaped closure strip 4 and the outer protrusion 3, the thickness of the arc-shaped closure strip 4 gradually increases from the vertical direction of the center to the upper and lower ends.

[0058] Referring to Figure 5 and Figure 6 , the control unit 5 comprises a mounting strip 51, a drive gear 52, a control rack 53 and an abutting spring 54, the inside of the stand pipe body 1 is hollow, both ends of the mounting strip 51 are welded and fixed with the inner circumferential side of the stand pipe body 1, the drive gear 52 is coaxially arranged with the stand pipe body 1, and the drive gear 52 is rotationally connected with the mounting strip 51; the number of control racks 53 is at least one, one end of the control rack 53 is rotationally connected with the inner arc surface of the arc-shaped closure strip 4, and the control rack 53 is engaged with the drive gear 52; one end of the abutting spring 54 is welded with the inner circumferential side of the stand pipe body 1, and the other end is abutted with the control rack 53 away from the drive gear 52, for keeping the engagement of the control rack 53 with the drive gear 52.

[0059] Referring to Figure 5 , in order to provide support for the part of the arc-shaped closure strip 4 extending into the inner cavity of the stand pipe body 1 when the outer protrusion 3 is stressed, the mounting strip 51 is located below the arc-shaped closure strip 4, and a sliding gap is left between the top wall of the mounting strip 51 and the arc-shaped closure strip 4, and one end of the arc-shaped closure strip 4 is abutted with the top wall of the mounting strip 51 when stressed.

[0060] Referring to Figure 6 , in order to further ensure the stability of the elastic force exertion direction of the abutting spring 54, a guide sleeve 6 is sleeved outside the abutting spring 54, one end of the guide sleeve 6 is welded and fixed with the inner wall of the stand pipe body 1, and the other end is left with a gap for the control rack 53 to pass through between the drive gear 52, and the abutting spring 54 is abutted with the control rack 53 outside the guide sleeve 6.

[0061] Referring to Figure 6 , in order to facilitate the rotation of the drive gear 52, and then drive the arc-shaped closure strip 4 to move through the control rack 53, the control unit 5 further comprises a driving member 55, the driving member 55 comprises a square rod 551, the square rod 551 is hollow, and the square rod 551 is connected with the drive gear 52, the square rod 551 is arranged away from the mounting strip 51, an external square long rod passes through the square rod 551 and rotates to realize the rotation of the square rod 551, and finally realize the rotation of the drive gear 52.

[0062] Referring to Figure 6 , in order to facilitate the square long rod to pass through the square rod 551, the square rod 551 is integrally formed with a flared section 7, the flared section 7 is located above the driving gear 52, the square rod 551 is located directly below the flared section 7, and the inner cavity of the flared section 7 is in communication with the inner cavity of the square rod 551.

[0063] The implementation principle of the cement mixing pile of the embodiment of the present application is as follows: first, a pile foundation hole 01 is excavated at a specified position by using a rotary drilling tool, then a forming cavity 02 is excavated by using an expanding drill, before a prefabricated stand pipe body 1 is placed into the pile foundation hole 01, force is applied to the square rod 551 by using the square long rod, the square rod 551 drives the driving gear 52 to rotate, the driving gear 52 controls the movement of the control rack 53 by cooperating with the abutting spring 54, the control rack 53 is connected with the arc-shaped sealing strip 4, so that the arc-shaped sealing strip 4 blocks the containing cavity 11 on the stand pipe body 1, so that the stand pipe body 1 as a whole has no protruding part, the sinking pressure of the stand pipe body 1 is reduced, then the stand pipe body 1 is lowered, until the stand pipe body 1 is lowered into place, then force is applied to the square rod 551 by using the square long rod again, the square rod 551 drives the driving gear 52 to rotate, the driving gear 52 controls the movement of the control rack 53 by cooperating with the abutting spring 54, the control rack 53 is connected with the arc-shaped sealing strip 4, so that the arc-shaped sealing strip 4 penetrates through the containing cavity 11 and extends into the forming cavity 02, then concrete is poured into the gap between the stand pipe body 1 and the inner wall of the pile foundation hole 01, the concrete flows into the forming cavity 02 under the action of its own gravity, and the arc-shaped sealing strip 4 is covered in the concrete, after the concrete solidifies, a cement mixing body 2 and an outer protrusion 3 are formed, and the concrete enters the inside of the stand pipe body 1 through the containing cavity 11, fills the hollow inside the stand pipe body 1, and at the same time directly pours concrete into the inner cavity of the stand pipe body 1.

[0064] In a second aspect, the embodiment of the present application discloses a cement mixing pile construction method, which adopts the cement mixing pile disclosed in the embodiment 1 of the present application, and includes

[0065] S1: pile foundation hole 01 and forming cavity 02 are excavated; a rotary drilling tool is used to excavate the pile foundation hole 01 and the forming cavity 02 in sequence, wherein the inner diameter of the pile foundation hole 01 is greater than the outer diameter of the stand pipe body 1;

[0066] S2: stand pipe body 1 is buried: force is applied to the square rod 551 by using the square long rod, the square rod 551 drives the driving gear 52 to rotate, the driving gear 52 controls the movement of the control rack 53 by cooperating with the abutting spring 54, the control rack 53 is connected with the arc-shaped sealing strip 4, so that the arc-shaped sealing strip 4 blocks the containing cavity 11 on the stand pipe body 1, then the stand pipe body 1 is vertically placed into the pile foundation hole 01;

[0067] S3: Strengthen the structure to extend: again through the square long rod to the square rod 551 force, square rod 551 drive gear 52 rotation, drive gear 52 through the cooperation with the abutment spring 54 to realize the movement of the control rack 53, control rack 53 and arc-shaped closed strip 4 is connected, so that the arc-shaped closed strip 4 rotation board and one end through the accommodation cavity 11 into the forming cavity 02, when the forming cavity 02 in the presence of weak soil collapse, through the control unit 5 drive arc-shaped closed strip 4 back and forth rotation, in order to collapse the weak soil to the stand pipe body 1 inner cavity;

[0068] S4: concrete pouring: into the gap between the pile hole 01 and the stand pipe body 1 injection concrete, after solidification forms cement mixing body 2, concrete in the forming cavity 02 after solidification forms the convex block 3, and at the same time to the gap between the pile hole 01 and the stand pipe body 1 injection concrete into the stand pipe body 1 inner cavity injection concrete.

[0069] The above are the preferred embodiments of the present application, not limited by the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application, should be covered within the protection scope of the present application.

Claims

1. A method for constructing a cement mixing pile, characterized in that: The utility model relates to a cement mixing body (2) is connected to the outer side of the stand pipe body (1), a plurality of outer protrusions (3) are connected with the cement mixing body (2), and a plurality of the outer protrusions (3) are distributed along the axial direction of the stand pipe body (1), a plurality of arc-shaped sealing strips (4) are coaxially arranged on the stand pipe body (1), a plurality of accommodating cavities (11) are formed in the stand pipe body (1), the arc-shaped sealing strip (4) is rotatably connected with the stand pipe body (1) and can seal the accommodating cavity (11), and the arc-shaped sealing strip (4) is connected with the outer protrusion (3) through the cement mixing body (2), a plurality of control units (5) are installed on the stand pipe body (1), the control unit (5) is connected with the arc-shaped sealing strip (4), and the control unit (5) is used for controlling the rotation angle of the arc-shaped sealing strip (4), the pile hole (01) and the forming cavity (02) are formed, the stand pipe body (1) is buried, the control unit (5) is adjusted, the arc-shaped sealing strip (4) seals the accommodating cavity (11) on the stand pipe body (1), and then is placed into the pile hole (01), the reinforcing structure is stretched out, the control unit (5) is adjusted again, the arc-shaped sealing strip (4) is rotated and one end is stretched into the forming cavity (02) through the accommodating cavity (11), concrete is poured, concrete is injected into the gap between the pile hole (01) and the stand pipe body (1), and the cement mixing body (2) is formed after solidification, and the outer protrusion (3) is formed after the concrete in the forming cavity (02) is solidified. In step S3, the arc-shaped sealing strip (4) is driven by the control unit (5) to rotate back and forth to shovel the collapsed soft soil into the inner cavity of the stand pipe body (1). In step S4, while injecting concrete into the gap between the pile hole (01) and the stand pipe body (1), concrete is also injected into the inner cavity of the stand pipe body (1). The control unit (5) comprises an installation strip (51) connected with the inner circumferential side of the stand pipe body (1) at both ends, a drive gear (52) rotatably connected to the installation strip (51), the drive gear (52) being coaxially arranged on the stand pipe body (1), at least one control rack (53) rotatably connected with one end of the arc-shaped sealing strip (4), the control rack (53) being engaged with the drive gear (52), an abutting spring (54) connected with the inner wall of the stand pipe body (1) at one end and abutting with the control rack (53) on the side away from the drive gear (52), and a driving member (55) installed on the installation strip (51) and connected with the drive gear (52) for rotating the drive gear (52). ​ ​ ​ ​ 2. The cement mixing pile construction method according to claim 1, characterized by: ​ 3. The cement mixing pile construction method according to claim 1, characterized by: ​ 4. The cement mixing pile construction method according to claim 1, characterized by: ​ ​ ​ ​ ​ 5. The method for cement mixing pile construction according to claim 4, characterized in that: The abutting spring (54) is externally sleeved with a guide sleeve (6), one end of the guide sleeve (6) is connected with the inner wall of the stand pipe body (1), and the other end is left with a gap for the control rack (53) to pass through between the guide sleeve (6) and the drive gear (52).

6. The method for cement mixing pile construction according to claim 4, characterized in that: The mounting strip (51) is located below the arc-shaped closed strip (4), and a sliding gap is left between the top wall of the mounting strip (51) and the arc-shaped closed strip (4).

7. The method for cement mixing pile construction according to claim 4, characterized in that: The driving member (55) comprises A square rod (551) is hollowly arranged, and the square rod (551) is connected with the drive gear (52) and is staggered with the mounting strip (51).

8. The cement deep mixing pile construction method according to claim 7, characterized in that: An expanding section (7) is integrally connected on the square rod (551), the expanding section (7) is located above the drive gear (52), the square rod (551) is located directly below the expanding section (7), and the inner cavity of the expanding section (7) is communicated with the inner cavity of the square rod (551).

9. The method for cement mixing pile construction according to claim 1, characterized in that: The thickness of the arc-shaped closed strip (4) gradually increases from the center to the upper and lower ends.

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