CFG pile free cutting pile head device and method of using same

Abstract

This invention discloses a CFG pile head-cutting-free device and its usage method. The CFG pile head-cutting-free device includes a pressing mechanism, a closing mechanism connected to the bottom of the pressing mechanism for separating the top of the CFG pile from the excess CFG pile head, and a closing rod mechanism connected to the bottom of the closing mechanism for opening or closing the closing mechanism. After the CFG pile is poured and the pipe is pulled out, the closing mechanism opens and is embedded in the CFG pile by the pressing mechanism. The closing mechanism is located at the elevation of the top of the CFG pile. The closing mechanism is closed by operating the closing rod mechanism, thereby achieving the separation of the CFG pile from the pile head. This invention can be prefabricated in a factory or on-site according to different pile diameters and user requirements, and is not limited by pile diameter. Devices of different heights can be manufactured depending on the difference in elevation between the working surface and the designed pile top elevation during construction.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, specifically to a CFG pile head-cutting-free device and its usage method. Background Technology

[0002] According to the technical specifications for foundation treatment, the working surface should be 300mm to 500mm higher than the design pile top elevation during construction. Therefore, the working surface will be higher than the design pile top elevation during construction. After the CFG piles are completed, the piles will be cut off. It is required that the pile body below the pile top elevation should not be broken or the soil between the piles should not be disturbed during the pile cutting process. Therefore, most of the current methods are cutting or manual chiseling. Manual excavation and pile head cutting waste a lot of manpower and affect the construction period. Moreover, when excavating the foundation trench and removing the pile head, it is easy to cause the pile body to break below the design pile top elevation, and remedial measures must be taken. At the same time, the disturbance of the soil between the piles will inevitably reduce the bearing capacity of the composite foundation. The process is complicated and time-consuming, which can no longer meet the needs of rapid construction. Using a cutting machine for ring cutting results in high noise and serious dust pollution at the work site. In addition, the limited working space makes it impossible to effectively use mechanical equipment to cut off the pile head, resulting in serious energy and labor consumption losses. For example, Chinese patent CN219992450U discloses a novel circumferential cutting device for CFG piles. This device includes a frame, a pile fixing mechanism, a cutting mechanism, and a rotary drive mechanism. The frame includes a main frame and a rotating frame, with the rotating frame rotating around its own central axis on the main frame. The pile fixing mechanism is mounted on the rotating frame to fix the CFG pile body, making the CFG pile and the rotating frame coaxial. The rotary drive mechanism is mounted on the main frame and connected to the rotating frame to drive the rotating frame to rotate. The cutting mechanism is mounted on the rotating frame and rotates synchronously with the rotating frame to cut the CFG pile. This patented cutting machine performs circumferential cutting, resulting in high noise and severe dust pollution at the work site. Furthermore, due to the limited working space, it is impossible to effectively use mechanical equipment to cut off the pile head, leading to significant energy and labor consumption losses.

[0003] Therefore, providing a convenient CFG pile head-cutting-free device and its usage method that avoids manual excavation and CFG pile head cutting without increasing on-site work is a problem worthy of research. Summary of the Invention

[0004] The purpose of this invention is to provide a CFG pile head-cutting-free device and its usage method that is easy to operate, avoids manual excavation of earthwork and CFG pile head cutting, and does not increase on-site work.

[0005] The objective of this invention is achieved as follows: A CFG pile head-free device includes a pressing mechanism, a closing mechanism connected to the bottom of the pressing mechanism for separating the top of the CFG pile from the excess CFG pile head, and a closing rod mechanism connected to the bottom of the closing mechanism for opening or closing the closing mechanism. After the CFG pile is grouted and the pipe is pulled out, the closing mechanism is opened and embedded in the CFG pile by the pressing mechanism. The closing mechanism is located at the elevation of the top of the CFG pile. The closing mechanism is closed by operating the closing rod mechanism to achieve the separation of the CFG pile from the pile head.

[0006] The pressing mechanism includes a pressing ring in the horizontal direction and a pressing rod in the vertical direction that is fixedly connected to the lower surface of the pressing ring. The bottom of the pressing rod is fixedly connected to the closing mechanism.

[0007] The sealing mechanism includes a large sealing component connected to the bottom of the pressing mechanism and a small sealing component connected to the inner side of the large sealing component. The large sealing component and the small sealing component work together to compact and seal the top of the CFG pile.

[0008] The large enclosed assembly includes a circular large enclosed rotating shaft inner core that is fixedly connected to the bottom of the lower pressure rod, and several large enclosed bodies that are sleeved on the large enclosed rotating shaft inner core, forming a ring.

[0009] The large enclosed body includes a large enclosed rotating outer shaft sleeved on the inner core of the large enclosed rotating shaft and rotating relative to the inner core of the large enclosed rotating shaft, and a large enclosed plate fixedly connected to the outer surface of the large enclosed rotating outer shaft.

[0010] The small enclosed component includes a small enclosed rotating shaft inner core that is fixedly connected to the inner side of the large enclosed component at both ends by connecting plates, a small enclosed outer rotating shaft that is sleeved on the small enclosed rotating shaft inner core and rotates relative to the small enclosed rotating shaft inner core, and a small enclosed plate that is fixedly connected to the outer surface of the small enclosed outer rotating shaft.

[0011] The sealing rod mechanism includes a connecting hole on the small sealing plate, a sealing rod with a bolt assembly passing through the connecting hole at the bottom, an operating handle fixedly connected to the top of the sealing rod, and a leveling rod located at the bottom of the sealing rod; the distance between the leveling rod and the bottom of the sealing rod is greater than the thickness of the small sealing plate, so that the sealing rod can rotate relative to the small sealing plate. When both the large sealing plate and the small sealing plate are in the vertical direction, the sealing rod can also be in the vertical direction.

[0012] A method for using a CFG pile head-cutting-free device includes the following steps: S1. Drilling rig positioning: After positioning, correct the position and verticality of the drill rod, with a deviation of no more than 1%; S2. Mixing the mixture: Prepare the mixture according to the design ratio. The slump of the mixture is 160mm to 200mm. S3. Drilling: When drilling begins, close the drill bit valve and move the drill rod downwards until the drill bit touches the ground. Then, start the motor and rotate the drill rod to the design elevation. Turn off the motor and clean the soil around the borehole. When drilling, start slowly and then speed up to avoid the drill rod shaking. Check and correct the drill rod deviation in time. S4. Grouting and Pipe Pulling: After the CFG pile hole reaches the design elevation, drilling is stopped and the mixture is pumped. When the drill rod core tube is filled with the mixture, the pipe is pulled out. The pile pulling speed is 2m / min-3m / min. The pile forming process is carried out continuously to avoid work stoppage due to material supply problems. S5. Machine Relocation: Before relocating the machine, clean and identify the location of the next pile to ensure accuracy. If necessary, clean the drill rod and drill bit after relocation. S6. After the CFG pile is grouted and the pipe is pulled out, the sealing mechanism is embedded in the CFG pile through the pressure ring and the pressure rod. At this time, the large sealing plate and the small sealing plate are in the vertical open state, and the bottom surface of the sealing mechanism is the same as the design elevation. S7. After the concrete has settled and compacted, the closing mechanism is pressed down to the design elevation using the pressure ring. The large and small closing plates are pressed down using the closing rod device. The large closing plate is rotated to a horizontal position through the inner core of the large closing rotating shaft, which is the design elevation. The small closing plate is rotated to a horizontal position through the inner core of the small closing rotating shaft, which is the design elevation. S8. The leveling rod is perpendicular to the small closed rotating outer axis by the closing rod mechanism, so that both the large and small closing plates are locked at the design elevation. After the pile is formed, the dividing effect of the large and small closing plates will divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation, mechanical excavation can be directly adopted without the need for pile cutting. The pile body above the design elevation is removed along with the soil between the piles, and the pile head surface is flat, avoiding pile body breakage and disturbance of the soil between piles below the pile top elevation.

[0013] The beneficial effects of this invention are: 1. This invention can be prefabricated in a factory or on the construction site according to different pile diameters and user requirements, and is not limited by the size of the pile diameter. Devices of different heights can be manufactured depending on the difference in elevation between the working surface and the designed pile top during construction.

[0014] 2. This invention pre-divides CFG piles using large and small sealing plates, allowing the CFG piles and the soil between them to be mechanically cleared together during earthwork excavation. The process is simple, time-saving, reduces construction costs, and increases the utilization rate of machinery.

[0015] 3. The new process eliminates the need for pile head cutting and removes the need for manual excavation; mechanical excavation is sufficient. Mechanical excavation is highly efficient; excavating approximately 100 CFG piles takes about 1-2 days. The cost is relatively low and is only affected by the transportation distance.

[0016] 4. The use of this invention makes the top elevation of the CFG pile level with the design elevation, the top surface of the pile is flat, and the forming effect is better. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the completed construction and installation of the present invention.

[0018] Figure 2 This is a perspective view of the present invention.

[0019] Figure 3 This is a cross-sectional view along direction 1-1 of the present invention.

[0020] Figure 4 This is a cross-sectional view of the present invention along direction 2-2.

[0021] Figure 5 This is a schematic diagram of the sealing rod device of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the sealing plate device of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the sealing plate device of the present invention. Figure 2 ; In the diagram: 1 - Inner core of large enclosed rotating shaft, 2 - Outer shaft of large enclosed rotating shaft, 3 - Lower pressure rod, 4 - Lower pressure ring, 5 - Large enclosed plate, 6 - Enclosed rod mechanism, 7 - Inner core of small enclosed rotating shaft, 8 - Outer shaft of small enclosed rotating shaft, 9 - Small enclosed plate, 10 - Bolt, 10a - Blind hole, 11 - Leveling rod; 12 - Enclosed rod, 13 - Operating handle, 14 - Connecting hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0024] like Figure 1 and Figure 2 As shown, a CFG pile head-free device includes a pressing mechanism, a closing mechanism connected to the bottom of the pressing mechanism for separating the top of the CFG pile from the excess CFG pile head, and a closing rod mechanism connected to the bottom of the closing mechanism for opening or closing the closing mechanism. After the CFG pile is grouted and the pipe is pulled out, the closing mechanism is opened and embedded in the CFG pile by the pressing mechanism. The closing mechanism is located at the elevation of the top of the CFG pile. The closing mechanism is closed by operating the closing rod mechanism to achieve the separation of the CFG pile from the pile head.

[0025] like Figure 3 and Figure 4As shown, the pressing mechanism includes a pressing ring 4 located in the horizontal direction and a pressing rod 3 located in the vertical direction and fixedly connected to the lower surface of the pressing ring 4 by welding. The bottom of the pressing rod 3 is fixedly connected to the closing mechanism. The pressing ring 4 is made of plain round steel bar with a diameter of 25mm, and the diameter of the pressing ring 4 is the same as the diameter of the pile hole.

[0026] The material of the lower pressure rod 3 is a plain round steel bar with a diameter of 25mm. The length of the lower pressure rod 3 is the height from the design elevation of the pile top to the construction surface. The diameter can be adjusted according to the length of the lower pressure rod 3, as long as the force transmission conditions are met and the cost is not wasted.

[0027] like Figure 6 As shown, the sealing mechanism includes a large sealing component connected to the bottom of the lower pressure rod 3 and a small sealing component connected to the inner side of the large sealing component. The large and small sealing components work together to compact and seal the top of the CFG pile. The large sealing component includes a large, circular rotating shaft inner core 1 fixedly connected to the bottom of the lower pressure rod 3 by welding, and several large sealing bodies fitted onto the large rotating shaft inner core 1, forming a ring. Each large sealing body includes a large rotating outer shaft 2 fitted onto the large rotating shaft inner core 1 and rotating relative to it, and a large sealing plate 5 fixedly connected to the outer surface of the large rotating outer shaft 2. The large rotating outer shaft 2 is fitted onto the large rotating shaft inner core 1 and is disconnected at the weld between the lower pressure rod 3 and the large rotating shaft inner core 1, allowing each large sealing plate 5 to rotate independently. The outer diameter of the large rotating outer shaft 2 is equal to the pile diameter. Four large enclosed plates are provided, arranged in a fan shape. Both the large and small enclosed plates are made of aluminum. The outer rotating shaft of the large enclosed shaft is made of 5mm thick hollow aluminum tubing with an outer diameter of 28mm and a length equal to the circumference of the outer rotating shaft minus 1 / 4 of the diameter of the four lower pressure rods. The inner core of the large rotating shaft is made of 25mm plain round steel bar.

[0028] The small enclosed assembly includes a small enclosed rotating shaft inner core 7, whose two ends are fixedly connected to the inner sides of the large enclosed plate 5 via connecting plates; a small enclosed outer rotating shaft 8, which is sleeved on the small enclosed rotating shaft inner core 7 and rotates relative to the small enclosed rotating shaft inner core 7; and a small enclosed plate 9, which is fixedly connected to the outer surface of the small enclosed outer rotating shaft 8. The small enclosed outer rotating shaft 8 rotates relative to the small enclosed rotating shaft inner core 7, thereby causing the small enclosed outer rotating shaft 8 and the small enclosed plate 9 to rotate synchronously, thus realizing the rotation of the small enclosed plate 9. The material of the small enclosed rotating shaft inner core is 6mm plain round steel bar, and its length is 190mm.

[0029] like Figure 5As shown, the sealing rod mechanism 6 includes a connecting hole 14 located on the small sealing plate 9, a sealing rod 12 with its bottom passing through the connecting hole 14 and equipped with a bolt assembly, an operating handle 13 fixedly connected to the top of the sealing rod 12, and a leveling rod 11 located at the lower part of the sealing rod 12; the distance between the leveling rod 11 and the bottom of the sealing rod 12 is greater than the thickness of the small sealing plate 9, so that the sealing rod 12 can rotate relative to the small sealing plate 9. When both the large sealing plate 5 and the small sealing plate 9 are in the vertical direction, the sealing rod 12 can also be in the vertical direction. The bolt assembly includes a blind hole 10a located at the bottom of the sealing rod 12 and along the length of the sealing rod 12, and a flat-head bolt threaded to the blind hole 10a. The head diameter of the flat-head bolt is larger than that of the connecting hole 14 to prevent the sealing rod 12 from separating from the small sealing plate 9. In use, after the CFG pile is grouted and the pipe is pulled out, the small sealing plate 9 and the large sealing plate 5 are in the vertical direction. Then, the pressure ring 4 is pressed down forcefully, causing the pressure rod 3 to drive the sealing mechanism to move downward. When the bottom of the pressure rod 3 moves to the top elevation of the CFG pile, the operating handle 13 is used as the force point to transmit the force to the large sealing plate and the small sealing plate through the sealing rod 12. The large sealing plate and the small sealing plate are rotated sequentially around the inner core 1 of the large sealing rotation axis and the inner core 7 of the small sealing rotation axis, so that the large sealing plate 5 and the small sealing plate 9 are in the horizontal position in sequence, realizing the separation of the top of the CFG pile and the pile head, and finally reaching the designed pile top elevation. Example 2

[0030] A method for using a CFG pile head-cutting-free device includes the following steps: S1. Drilling rig positioning: After positioning, correct the position and verticality of the drill rod, with a deviation of no more than 1%; S2. Mixing the mixture: Prepare the mixture according to the design ratio. The slump of the mixture is 160mm to 200mm. S3. Drilling: When drilling begins, close the drill bit valve and move the drill rod downwards until the drill bit touches the ground. Then, start the motor and rotate the drill rod to the design elevation. Turn off the motor and clean the soil around the borehole. When drilling, start slowly and then speed up to avoid the drill rod shaking. Check and correct the drill rod deviation in time. S4. Grouting and Pipe Pulling: After the CFG pile hole reaches the design elevation, drilling is stopped and the mixture is pumped. When the drill rod core tube is filled with the mixture, the pipe is pulled out. The pile pulling speed is 2m / min-3m / min. The pile forming process is carried out continuously to avoid work stoppage due to material supply problems. S5. Machine Relocation: Before relocating the machine, clean and identify the location of the next pile to ensure accuracy. If necessary, clean the drill rod and drill bit after relocation. S6. After the CFG pile is grouted and the pipe is pulled out, the sealing mechanism is embedded in the CFG pile through the pressure ring and the pressure rod. At this time, the large sealing plate and the small sealing plate are in the vertical open state, and the bottom surface of the sealing mechanism is the same as the design elevation. S7. After the concrete has settled and compacted, the closing mechanism is pressed down to the design elevation using the pressure ring. The large and small closing plates are pressed down using the closing rod device. The closing rod moves simultaneously to the center of the pressure ring and in the downward direction, so that the large closing plate rotates to a horizontal position through the inner core of the large closing rotating shaft, which is the design elevation. The small closing plate rotates to a horizontal position through the inner core of the small closing rotating shaft, which is the design elevation. S8. The leveling rod is perpendicular to the small closed rotating outer axis by the closing rod mechanism, so that both the large and small closing plates are locked at the design elevation. After the pile is formed, the dividing effect of the large and small closing plates will divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation, mechanical excavation can be directly adopted without the need for pile cutting. The pile body above the design elevation is removed along with the soil between the piles, and the pile head surface is flat, avoiding pile body breakage and disturbance of the soil between piles below the pile top elevation.

Claims

1. A CFG pile free pile head cutting device, characterized in that, It includes a pressing mechanism, a closing mechanism connected to the bottom of the pressing mechanism and used to separate the top of the CFG pile from the excess CFG pile head, and a closing rod mechanism connected to the bottom of the closing mechanism and used to open or close the closing mechanism. After the CFG pile is grouted and the pipe is pulled out, the closing mechanism is opened and the pressing mechanism is used to embed the closing mechanism in the CFG pile. The closing mechanism is located at the elevation of the top of the CFG pile. The closing mechanism is closed by the operation of the closing rod mechanism to achieve the separation of the CFG pile from the pile head. The sealing mechanism includes a large sealing component connected to the bottom of the pressing mechanism and a small sealing component connected to the inner side of the large sealing component. The large sealing component and the small sealing component work together to compact and seal the top of the CFG pile; the sealing rod mechanism is connected to the small sealing plate. The large enclosed assembly includes a circular large enclosed rotating shaft inner core that is fixedly connected to the bottom of the pressing mechanism, and several large enclosed bodies that are sleeved on the large enclosed rotating shaft inner core. The several large enclosed bodies are sleeved on the large enclosed rotating shaft inner core to form a ring. The small enclosed component includes a small enclosed rotating shaft inner core that is fixedly connected to the inner side of the large enclosed component at both ends by connecting plates, a small enclosed outer rotating shaft that is sleeved on the small enclosed rotating shaft inner core and rotates relative to the small enclosed rotating shaft inner core, and a small enclosed plate that is fixedly connected to the outer surface of the small enclosed outer rotating shaft.

2. The CFG pile free pile head cutting device according to claim 1, characterized in that, The pressing mechanism includes a pressing ring in the horizontal direction and a pressing rod in the vertical direction that is fixedly connected to the lower surface of the pressing ring. The bottom of the pressing rod is fixedly connected to the closing mechanism.

3. The CFG pile free pile head device according to claim 2, characterized in that, The large enclosed body includes a large enclosed rotating outer shaft sleeved on the inner core of the large enclosed rotating shaft and rotating relative to the inner core of the large enclosed rotating shaft, and a large enclosed plate fixedly connected to the outer surface of the large enclosed rotating outer shaft.

4. The CFG pile free pile head cutting device according to claim 3, characterized in that, The sealing rod mechanism includes a connection hole on the small sealing plate, a sealing rod with a bolt assembly passing through the connection hole at the bottom, an operating handle fixedly connected to the top of the sealing rod, and a leveling rod located at the bottom of the sealing rod; the distance between the leveling rod and the bottom of the sealing rod is greater than the thickness of the small sealing plate, so that the sealing rod can rotate relative to the small sealing plate, and the sealing rod is also in the vertical direction when both the large sealing plate and the small sealing plate are in the vertical direction.

5. A method of using the CFG pile head-cutting-free device as described in claim 4, characterized in that, Includes the following steps: S1. Drilling rig positioning: After positioning, correct the position and verticality of the drill rod, with a deviation of no more than 1%; S2. Mixing the mixture: Prepare the mixture according to the design ratio, with a slump of 160mm to 200mm. S3. Drilling: When drilling begins, close the drill bit valve, move the drill rod downwards until the drill bit touches the ground, start the motor, rotate the drill rod and lower it to the design elevation, turn off the motor, and clean the soil around the borehole. S4. Grouting and Pipe Pulling: After the CFG pile hole reaches the design elevation, drilling is stopped and the mixture is pumped. When the drill rod core tube is filled with the mixture, the pipe is pulled out. The pile pulling speed is 2m / min-3m / min. The pile forming process is carried out continuously to avoid work stoppage due to material supply problems. S5. Relocation: Before relocating the machine, clean and identify the location of the next pile. S6. After the CFG pile is grouted and the pipe is pulled out, the sealing mechanism is embedded in the CFG pile through the pressure ring and the pressure rod. At this time, the large sealing plate and the small sealing plate are in the vertical open state, and the bottom surface of the sealing mechanism is the same as the design elevation. S7. After the concrete has settled and compacted, the closing mechanism is pressed down to the design elevation using the pressure ring. The large and small closing plates are pressed down using the closing rod device. The large closing plate is rotated to a horizontal position through the inner core of the large closing rotating shaft, which is the design elevation. The small closing plate is rotated to a horizontal position through the inner core of the small closing rotating shaft, which is the design elevation. S8. The leveling rod is perpendicular to the small closed rotating outer axis by the closing rod mechanism, so that both the large and small closing plates are locked at the design elevation. After the pile is formed, the dividing effect of the large and small closing plates will divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation, mechanical excavation can be directly adopted without the need for pile cutting. The pile body above the design elevation is removed along with the soil between the piles, and the pile head surface is flat, avoiding pile body breakage and disturbance of the soil between piles below the pile top elevation.

Images