A concrete vibrator for dry holes of large-aperture pile foundations

Abstract

The present invention relates to the technical field of vibrators, and specifically discloses a concrete vibrator for dry holes of large-diameter pile foundations, which includes a concrete hopper that is inserted into the pile hole perpendicular to the center of the pile hole and is lifted by a crane. The bottom end of the concrete hopper is fixedly installed with an assembly pipe, and the outer side of the assembly pipe is fixedly installed with a protective cover. A turbulent flow promoting and uniform mixing unit and a plurality of vibrators are arranged between the protective cover and the assembly pipe. In this application, the vibrators move synchronously with the concrete hopper, and their relative positions are fixed, so that the newly poured concrete can be vibrated in real time. As the concrete hopper is lifted, the continuously poured concrete can be timely vibrated by the vibrators, so that after each part of the concrete is poured, the vibrators can immediately turn over the material and vibrate it, avoiding the concrete segregation caused by the large diameter and depth of the dry hole of the large-diameter pile foundation.

Description

Technical Field

[0001] The invention relates to the technical field of vibrators, and more particularly to a concrete vibrator for large-diameter pile foundation dry holes. Background Art

[0002] The dry hole of large-diameter pile foundation is obtained by mechanical drilling or manual digging without mud wall protection under geological conditions with no groundwater or less groundwater. The dry hole of large-diameter pile foundation is usually deep. During the pouring of concrete, coarse aggregate may sink due to gravity, while relatively light components such as cement mortar may float, resulting in stratification and segregation of concrete. The use of concrete vibrator can fully mix the aggregate and mortar in the concrete through vibration, effectively avoiding stratification and segregation, and ensuring the uniformity and density of concrete within the entire depth range of the pile hole.

[0003] At present, when a concrete vibrator is vibrating, after the concrete in the pile hole is poured to a certain height, the operator inserts the vibrator vertically from above the concrete, and the vibration wave is transmitted from the vibrating rod to the concrete in contact with it, so that the particles inside the concrete are vibrated. After vibrating for a period of time at one place, the operator pulls the vibrator out of the concrete, moves it to an adjacent position and inserts it into the concrete again for vibration. This operation is repeated, and the concrete at different positions in the pile hole is gradually vibrated. However, the current concrete vibrator still has certain defects in the vibration operation process: 1. The diameter and depth of the dry hole of the large-diameter pile foundation are large, and the concrete is prone to segregation during the pouring process. If the vibration is not timely, the coarse aggregate will sink quickly, resulting in uneven distribution of the concrete, and the vibration effect of the vibrating rod at different depths in the hole may be different. At a shallow hole depth, the vibration energy of the vibrating rod is relatively strong, and the concrete vibration is relatively dense, but as the depth increases, the vibration energy will gradually decay, which may cause the concrete at the bottom or deep of the hole to be insufficiently vibrated, resulting in insufficient density.

[0004] 2. At present, during the dry-hole pouring process of large-diameter pile foundations, a crane is often used to lift and lower the concrete hopper up and down. The weight and movement of the concrete hopper have a certain vibrating effect on the concrete, assisting in vibrating the concrete to make it dense. However, the vibration of this method depends on the operation of the crane and cannot accurately control the frequency, amplitude, and time like a professional vibrator. This results in uneven vibration force on different parts of the concrete. In some areas, the vibration is excessive, causing the separation of aggregate and cement slurry and a reduction in strength; in some areas, the vibration is insufficient, with many internal bubbles and voids, affecting the density and quality uniformity. Moreover, when the crane lifts the concrete hopper for vibration, it is difficult to grasp the vibration conditions at different depths inside the concrete. Especially during large-depth pouring, the vibration force attenuates with the increase in depth, making it difficult to fully vibrate the deep concrete, and it is difficult to discharge air and moisture. The distribution of coarse aggregate is uneven, and the density is insufficient, reducing the structural bearing capacity and possibly causing problems such as deformation and cracks, affecting the project quality and safety. Summary of the Invention

[0005] The present invention provides a concrete vibrator for dry holes of large-diameter pile foundations to solve the above technical problems.

[0006] The present invention provides a concrete vibrator for dry holes of large-diameter pile foundations, which includes a concrete hopper inserted into the pile hole perpendicular to the center of the pile hole and lifted by a crane. The bottom end of the concrete hopper is fixedly installed with an assembly pipe, and the outer side of the assembly pipe is fixedly installed with a protective cover. A turbulent flow promoting and even mixing unit and a plurality of vibrating rods are arranged between the protective cover and the assembly pipe. The turbulent flow promoting and even mixing unit includes a turbulent flow promoting component and a material turning compound movement component. A plurality of turbulent flow promoting components and a plurality of material turning compound movement components are both circumferentially distributed, and each material turning compound movement component is correspondingly connected to a turbulent flow promoting component one by one to control the corresponding turbulent flow promoting component to perform rotational lifting movement.

[0007] The material turning compound movement component includes a bushing fixedly installed on the outer side of the assembly pipe and a control shaft rotatably installed inside the bushing. A square rod is fixedly installed at the bottom end of the control shaft, and a cylindrical cam is slidably sleeved on the outer side of the square rod. The turbulent flow promoting component includes a turning paddle rotatably installed at the bottom of the cylindrical cam through a rotating shaft.

[0008] The turbulent flow promoting component cooperates with the material turning compound movement component to turn up the concrete located below the vibrating rod to the vibration center of the vibrating rod, while strengthening the convection of the concrete in the pile hole and promoting the uniform distribution of the concrete, and enabling the concrete to be fully vibrated to improve the density and homogeneity of the concrete.

[0009] Further, the material turning compound movement component further includes a cam groove opened on the outer side of the cylindrical cam and two fixing rings fixedly installed on the outer side of the assembly pipe relatively up and down. The inner walls of the upper fixing ring and the lower fixing ring are both fixedly installed with fixing rods slidably matched with the cam groove, and the two relatively up and down fixing rods are distributed at an interval of 180 degrees in the circumferential direction of the fixing ring.

[0010] Furthermore, the turbulent flow promoting and homogenizing component further includes a driving motor fixedly installed on the inner wall at the rear side of the protective cover. The driving motor drives the control shaft at the rear side through a gear transmission method, and the control shaft at the rear side is connected to the other control shafts through a belt transmission method.

[0011] Furthermore, a vibration domain expansion and adjustment unit is further provided between the protective cover and the assembly pipe. The vibration domain expansion and adjustment unit includes a plurality of variable-diameter execution components. The plurality of variable-diameter execution components are circumferentially distributed on the outer side of the assembly pipe and are alternately arranged with the turbulent flow promoting and homogenizing component. The variable-diameter execution component includes a mounting rail fixedly installed on the outer side of the assembly pipe and a moving sleeve slidably installed in the mounting rail. An installation shaft is fixedly installed in the moving sleeve, and a vibration rod is fixedly installed at the bottom end of the installation shaft.

[0012] Furthermore, a chute is opened on one side of the installation shaft close to the assembly pipe. A slider is slidably installed in the chute. A connecting rod is jointly hinged between the slider and the outer wall of the assembly pipe, and a tension spring is jointly installed between the connecting rod and the outer wall of the assembly pipe.

[0013] Furthermore, the vibration domain expansion and adjustment unit further includes a regulation component for controlling the radial movement of the variable-diameter execution component to drive the vibration rod to move synchronously and adjust the vibration center of the vibration rod.

[0014] Furthermore, the regulation component includes a rotating sleeve rotatably installed on the outer side of the assembly pipe and a plurality of cam discs fixedly installed on the outer side of the rotating sleeve and circumferentially distributed. The cam discs are used to rotate and squeeze the installation shaft, and the plurality of cam discs respectively correspond to the plurality of installation shafts one by one.

[0015] Furthermore, a control motor is fixedly installed on the inner wall at the top of the protective cover. The control motor drives the rotating sleeve through a gear transmission method.

[0016] Furthermore, a plurality of through grooves that are circumferentially distributed and correspond to the plurality of installation shafts one by one are opened at the bottom of the protective cover. A corrugated cover is fixedly installed at the bottom of the through groove. The installation shaft passes through the through groove and the corrugated cover and extends below the protective cover. The bottom of the corrugated cover is fixedly installed on the outer side of the installation shaft, and the corrugated cover deforms adaptively when the installation shaft moves.

[0017] The beneficial effects of the present invention are as follows: 1. In this application, the vibrating rod moves synchronously with the concrete hopper, and their relative positions are fixed, enabling real-time vibration of the newly poured concrete. As the concrete hopper is lifted, the continuously poured concrete can be promptly vibrated by the vibrating rod. The synchronous movement method ensures that the vibrating rod can immediately turn over and vibrate each part of the concrete after pouring, effectively avoiding the segregation of concrete caused by the large diameter and depth of the dry hole of the large-diameter pile foundation, guaranteeing the uniformity of the concrete throughout the depth of the pile hole, improving the quality of the pile foundation, and also ensuring relatively balanced vibration intensity during vibration at different depths, avoiding the situation where the vibrating rod vibrates excessively in the shallow part while having insufficient vibration energy in the deep part.

[0018] 2. In this application, the material turning component turns the material upward, while the newly poured concrete is conveyed downward, and the two move towards each other, thus forming a convection. On the one hand, during the convection process, the aggregates and cement slurry at different depth positions are fully mixed and stirred, and the originally unevenly distributed coarse aggregates and cement slurry are redistributed evenly under the action of convection, improving the homogeneity of the concrete. On the other hand, during the concrete pouring process, air is inevitably mixed in to form bubbles, and the up-and-down convection allows the bubbles to have more opportunities to move upward and escape, thereby accelerating the discharge of air inside the concrete, and further enhancing the density of the concrete and the strength and stability of the pile foundation.

[0019] 3. In this application, through the design that the material turning paddle works near the vibrating rod, when the material turning paddle mixes and turns up the concrete in a small area, the vibrating rod can promptly vibrate this part of the concrete, enabling the aggregates and cement slurry to quickly reach a relatively stable state in a small space, thereby improving the vibration effect while avoiding the segregation of concrete caused by excessive disturbance.

[0020] 4. In this application, the vibration domain expansion and adjustment unit can flexibly adjust the vibration center and vibration range of the vibrating rod, adapt to pile holes with different diameters and complex construction environments, improve the versatility of the vibrator, reduce construction difficulties caused by pile hole differences, and lower construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a state diagram of the present invention during the vibration operation.

[0022] Figure 2 is a three-dimensional structural schematic diagram of the concrete hopper, assembly pipe, protective cover, corrugated cover, and vibrating rod of the present invention.

[0023] Figure 3 is a partial three-dimensional structural schematic diagram of the vibration domain expansion and adjustment unit and the turbulent flow promoting and uniform mixing unit of the present invention.

[0024] Figure 4It is a schematic perspective view of the driving motor, cylindrical cam, cam groove, fixing ring and fixing rod parts of the present invention.

[0025] Figure 5 It is a schematic perspective view of the assembly pipe, cam disc, mounting shaft, vibrating rod and rotating sleeve parts of the present invention.

[0026] Figure 6 It is a schematic cross-sectional view of the mounting rail, moving sleeve, mounting shaft, sliding groove and slider parts of the present invention.

[0027] Figure 7 It is a schematic perspective view of the cylindrical cam, cam groove, material turning paddle and rotating shaft parts of the present invention.

[0028] Figure 8 It is a schematic cross-sectional view of the shaft sleeve, control shaft, square rod, cylindrical cam and fixing ring parts of the present invention.

[0029] In the figure: 1, through groove; 2, concrete hopper; 3, assembly pipe; 4, protective cover; 5, vibration domain expansion and adjustment unit; 6, turbulent flow promoting and mixing unit; 7, corrugated cover; 8, vibrating rod; 501, variable diameter execution component; 502, regulation component; 5011, mounting rail; 5012, moving sleeve; 5013, mounting shaft; 5014, sliding groove; 5015, slider; 5016, connecting rod; 5017, tension spring; 5021, rotating sleeve; 5022, cam disc; 5023, control motor; 601, turbulent flow promoting component; 602, material turning composite motion component; 603, driving motor; 6011, rotating shaft; 6012, material turning paddle; 6021, shaft sleeve; 6022, control shaft; 6023, square rod; 6024, cylindrical cam; 6025, cam groove; 6026, fixing ring; 6027, fixing rod. Detailed implementation manners

[0030] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is to enable those skilled in the art to better understand and thus implement the subject matter described herein. Changes can be made to the functions and arrangements of the elements discussed without departing from the scope of protection of the content of this specification. Each example can omit, substitute or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0031] Refer to Figure 1 、 Figure 2 and Figure 3, in this embodiment, a concrete vibrator for large-aperture pile foundation dry holes is proposed, which is used to vibrate and evenly mix the concrete in the pile holes on the ground. It includes a concrete hopper 2 inserted into the pile hole perpendicular to the center of the pile hole and lifted by a crane. The concrete hopper 2 serves as a concrete conveying channel to convey the concrete from the ground to the pile hole. A fitting pipe 3 is fixedly installed at the bottom end of the concrete hopper 2, and a protective cover 4 is fixedly installed on the outer side of the fitting pipe 3. The protective cover 4 can block the splashing concrete during the vibration process, protecting its internal components from the direct impact and abrasion of the concrete and preventing the concrete from affecting the normal operation of the components.

[0032] A vibration domain expansion and adjustment unit 5, a turbulent flow promoting and mixing unit 6, and multiple vibrating rods 8 are arranged between the protective cover 4 and the fitting pipe 3. The fitting pipe 3 provides installation positions for the protective cover 4, the turbulent flow promoting and mixing unit 6, the vibrating rods 8, and the vibration domain expansion and adjustment unit 5, playing a role of connection and support. The turbulent flow promoting and mixing unit 6 includes a turbulent flow promoting component 601 and a material turning composite motion component 602. A plurality of turbulent flow promoting components 601 and a plurality of material turning composite motion components 602 are both circumferentially distributed, and each material turning composite motion component 602 is connected to a corresponding turbulent flow promoting component 601 one by one to control the corresponding turbulent flow promoting component 601 to perform rotational lifting motion.

[0033] During specific use, during the pouring preparation operation before the vibration operation, the fitting pipe 3 is fixedly connected to the bottom of the concrete hopper 2 through a flange. During construction, the concrete is continuously and stably poured into the bottom of the pile hole through the concrete hopper 2 and the fitting pipe 3. As the pouring progresses, the concrete hopper 2 is gradually lifted to ensure that the pile hole can be evenly and completely filled with concrete, providing a suitable concrete environment for the subsequent vibration.

[0034] Refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , the vibration domain expansion and adjustment unit 5 includes a plurality of diameter-changing execution components 501. The plurality of diameter-changing execution components 501 are circumferentially distributed on the outer side of the fitting pipe 3 and are alternately arranged with the turbulent flow promoting components 601. The diameter-changing execution component 501 includes a mounting rail 5011 fixedly installed on the outer side of the fitting pipe 3 and a moving sleeve 5012 slidably installed in the mounting rail 5011. An installation shaft 5013 is fixedly installed in the moving sleeve 5012, and the vibrating rod 8 is fixedly installed at the bottom end of the installation shaft 5013.

[0035] Refer to Figure 5 and Figure 6 , a chute 5014 is opened on one side of the installation shaft 5013 close to the fitting pipe 3. A slider 5015 is slidably installed in the chute 5014. A connecting rod 5016 is jointly hinged between the slider 5015 and the outer wall of the fitting pipe 3, and a tension spring 5017 is jointly installed between the connecting rod 5016 and the outer wall of the fitting pipe 3.

[0036] See also Figure 3 and Figure 5 The vibration domain expansion adjustment unit 5 also includes a control component 502, which is used to control the radial movement of the variable diameter execution component 501 to drive the vibrating rod 8 to move synchronously and adjust the vibration center of the vibrating rod 8. The control component 502 includes a rotating sleeve 5021 rotatably installed on the outside of the assembly tube 3 and a plurality of cam discs 5022 fixedly installed on the outside of the rotating sleeve 5021 and distributed in a circle. The cam disc 5022 is used to rotate, extrude and toggle the installation shaft 5013. The plurality of cam discs 5022 correspond to the plurality of installation shafts 5013 one by one. A control motor 5023 is fixedly installed on the top inner wall of the protective cover 4, and the control motor 5023 drives the rotating sleeve 5021 through gear transmission.

[0037] See also Figure 2 , Figure 3 , Figure 5 and Figure 6 The bottom of the protective cover 4 is provided with a plurality of through grooves 1 which are circumferentially distributed and correspond one to one with the plurality of mounting shafts 5013. A corrugated cover 7 is fixedly installed at the bottom of the through groove 1. The mounting shaft 5013 passes through the through groove 1 and the corrugated cover 7 and extends to the bottom of the protective cover 4. The bottom of the corrugated cover 7 is fixedly installed on the outside of the mounting shaft 5013. The through groove 1 and the corrugated cover 7 at the bottom of the protective cover 4 provide space for the movement of the mounting shaft 5013 and the vibrating rod 8. The bottom of the corrugated cover 7 is fixed on the outside of the mounting shaft 5013 and can adaptively deform with the movement of the mounting shaft 5013, thereby preventing concrete from entering the interior of the protective cover 4 and not hindering the movement and adjustment of the mounting shaft 5013.

[0038] During specific use, when it is necessary to adjust the vibration range and the vibration center, the output shaft of the control motor 5023 drives the rotating sleeve 5021 to rotate through gear transmission, thereby driving the multiple cam plates 5022 distributed in a circle on the outside of the rotating sleeve 5021 to rotate accordingly, and the rotating cam plates 5022 will squeeze and toggle the installation shaft 5013 to move the installation shaft 5013, driving the movable sleeve 5012 to slide along the installation rail 5011, and when the installation shaft 5013 moves, the slider 5015 in the slide groove 5014 slides accordingly, and at the same time, the movement of the installation shaft 5013 is transmitted to the connecting rod 5016 through the slider 5015, and the connecting rod 5016 converts this force into a pulling force along its own axial direction (cooperating with a tension spring), so that the movement of the installation shaft 5013 is more stable and maintained in a specific direction, while playing a pulling role for the reset of the movable sleeve 5012, and when the adjustment is completed, the output shaft of the control motor 5023 stops rotating.

[0039] See also Figure 3 , Figure 7 and Figure 8, the material turning compound motion assembly 602 includes a bushing 6021 fixedly installed on the outer side of the assembly pipe 3 and a control shaft 6022 rotatably installed in the bushing 6021. A square rod 6023 is fixedly installed at the bottom end of the control shaft 6022. A cylindrical cam 6024 is slidably sleeved on the outer side of the square rod 6023. The turbulent flow promoting and leveling assembly 601 includes a material turning paddle 6012 rotatably installed at the bottom of the cylindrical cam 6024 through a rotating shaft 6011.

[0040] Refer to Figure 4 and Figure 8 , the material turning compound motion assembly 602 further includes a cam groove 6025 opened on the outer side of the cylindrical cam 6024 and two fixing rings 6026 fixedly installed on the outer side of the assembly pipe 3 in an up-and-down opposite manner. Fixed rods 6027 slidably engaged with the cam groove 6025 are fixedly installed on the inner walls of the upper fixing ring 6026 and the lower fixing ring 6026. The two fixed rods 6027 opposite to each other up and down are distributed at an interval of 180 degrees in the circumferential direction of the fixing ring 6026.

[0041] Refer to Figure 3 , Figure 4 and Figure 7 , the turbulent flow promoting and leveling assembly 601 further includes a driving motor 603 fixedly installed on the inner wall at the rear side of the protective cover 4. The driving motor 603 drives the control shaft 6022 at the rear side in a gear transmission manner. The control shaft 6022 at the rear side is connected to the remaining control shafts 6022 in a belt transmission manner.

[0042] During specific use, during the process of pouring concrete into the pile hole, there is a spacing between the bottom end of the assembly pipe 3 and the poured concrete, and the material turning paddle 6012 and the vibrating rod 8 are inserted into the concrete. As the concrete hopper 2 is gradually lifted, the vibrating rod 8 works synchronously. The driving motor 603 fixedly installed on the inner wall at the rear side of the protective cover 4 is started. The driving motor 603 transmits the power to the control shaft 6022 at the rear side in a gear transmission manner, causing the rear control shaft 6022 to start rotating and driving the remaining control shafts 6022 to rotate synchronously through a belt transmission manner. As the control shaft 6022 rotates, the square rod 6023 also rotates synchronously, thereby driving the cylindrical cam 6024 to rotate. During the rotation of the cylindrical cam 6024, since both fixed rods 6027 are slidably engaged with the cam groove 6025 opened on the outer side of the cylindrical cam 6024, this cooperation method enables the cylindrical cam 6024 to move up and down along the square rod 6023 while rotating, thereby realizing a compound motion of rotation and lifting.

[0043] It should be noted that a cam groove 6025 is provided on the outer side of the cylindrical cam 6024, and both fixed rods 6027 are slidably engaged with the cam groove 6025. This engagement method restricts and guides the movement of the cylindrical cam 6024. When the cylindrical cam 6024 rotates in a circular motion driven by the square rod 6023, the fixed rod 6027 will slide within the cam groove 6025. Due to the specific curve shape of the cam groove 6025, as the fixed rod 6027 slides within the cam groove 6025, a force along the axial direction of the square rod 6023 will be generated on the cylindrical cam 6024. This force causes the cylindrical cam 6024 to move up and down along the square rod 6023 while rotating in a circular motion, thereby realizing a combined rotational and lifting motion.

[0044] During the process of the cylindrical cam 6024 performing a combined rotational and lifting motion along the square rod 6023, the turning paddle 6012 is driven to perform a synchronous rotational and lifting motion. During the rotation of the turning paddle 6012, it agitates the surrounding concrete. At the same time, the lifting motion causes the turning paddle 6012 to lift the concrete located below the vibrating rod 8 upward to the vibration center of the vibrating rod 8, while the newly poured concrete flows downward, and the two form a convection. During the convection process, the aggregate and cement slurry in the concrete are fully mixed, and the air inside the concrete is also accelerated to be discharged under the action of vibration and turning, thereby improving the density and homogeneity of the concrete.

[0045] Finally, it should be noted that: Obviously, the above embodiments are merely examples given for clearly explaining the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A concrete vibrator for dry holes of large-aperture pile foundations, characterized in that, It includes a concrete hopper that is inserted into the pile hole perpendicular to the center of the pile hole and lifted by a crane. An assembly pipe is fixedly installed at the bottom end of the concrete hopper. A protective cover is fixedly installed on the outer side of the assembly pipe. A turbulent flow promoting and uniform mixing unit and a plurality of vibrating rods are arranged between the protective cover and the assembly pipe. The turbulent flow promoting and uniform mixing unit includes a turbulent flow promoting component and a material turning composite motion component. A plurality of turbulent flow promoting components and a plurality of material turning composite motion components are both circumferentially distributed, and each material turning composite motion component is connected to a corresponding turbulent flow promoting component one by one to control the corresponding turbulent flow promoting component to perform a rotary lifting motion; The material turning composite motion component includes a bushing fixedly installed on the outer side of the assembly pipe and a control shaft rotatably installed in the bushing. A square rod is fixedly installed at the bottom end of the control shaft. A cylindrical cam is slidably sleeved on the outer side of the square rod. The turbulent flow promoting component includes a material turning paddle rotatably installed at the bottom of the cylindrical cam through a rotating shaft; The material turning composite motion component further includes a cam groove opened on the outer side of the cylindrical cam and two fixing rings fixedly installed on the outer side of the assembly pipe relatively up and down. Fixing rods slidably engaged with the cam groove are fixedly installed on the inner walls of the upper fixing ring and the lower fixing ring. The two fixing rods opposite to each other up and down are distributed at an interval of 180 degrees in the circumferential direction of the fixing ring; A vibrating domain expansion and adjustment unit is further arranged between the protective cover and the assembly pipe. The vibrating domain expansion and adjustment unit includes a plurality of variable diameter execution components. The plurality of variable diameter execution components are circumferentially distributed on the outer side of the assembly pipe and are alternately arranged with the turbulent flow promoting components. The variable diameter execution component includes a mounting rail fixedly installed on the outer side of the assembly pipe and a moving sleeve slidably installed in the mounting rail. A mounting shaft is fixedly installed in the moving sleeve. The vibrating rod is fixedly installed at the bottom end of the mounting shaft.

2. The concrete vibrator for dry holes of large-aperture pile foundations according to claim 1, wherein The turbulent flow promoting component further includes a driving motor fixedly installed on the inner wall at the rear side of the protective cover. The driving motor drives the control shaft at the rear side through a gear transmission method. The control shaft at the rear side is connected to the remaining control shafts through a belt transmission method.

3. A concrete vibrator for dry holes of large-diameter pile foundations according to claim 1, characterized in that, A chute is opened on the side of the mounting shaft close to the assembly pipe. A slider is slidably installed in the chute. A connecting rod is jointly hinged between the slider and the outer wall of the assembly pipe. A tension spring is jointly installed between the connecting rod and the outer wall of the assembly pipe.

4. A concrete vibrator for dry holes of large-aperture pile foundations according to claim 1, characterized in that, The vibrating domain expansion and adjustment unit further includes a regulation component. The regulation component is used to control the radial movement of the variable diameter execution component to drive the vibrating rod to move synchronously and adjust the vibration center of the vibrating rod.

5. The concrete vibrator for dry holes of large-aperture pile foundations according to claim 4, characterized in that, The regulation component includes a rotating sleeve rotatably installed on the outer side of the assembly pipe and a plurality of cam discs fixedly installed on the outer side of the rotating sleeve and distributed circumferentially. The cam discs are used to rotate and squeeze the mounting shaft. The plurality of cam discs respectively correspond to the plurality of mounting shafts one by one.

6. The concrete vibrator for dry holes of large-aperture pile foundations according to claim 5, characterized in that, A control motor is fixedly installed on the inner wall at the top of the protective cover. The control motor drives the rotating sleeve through a gear transmission method.

7. The concrete vibrator for dry holes of large-aperture pile foundations according to claim 1, characterized in that, A plurality of through grooves distributed circumferentially and corresponding to the plurality of mounting shafts one by one are opened at the bottom of the protective cover. A corrugated cover is fixedly installed at the bottom of the through groove. The mounting shaft passes through the through groove and the corrugated cover and extends below the protective cover. The corrugated cover is fixedly installed on the outer side of the mounting shaft. When the mounting shaft moves, the corrugated cover deforms adaptively accordingly.

Images