CFG pile head cutting-free device and using method thereof

Abstract

The invention discloses a CFG pile head cutting-free device and a using method thereof.The CFG pile head cutting-free device comprises a pressing mechanism, a sealing mechanism connected with the bottom of the pressing mechanism and used for separating the top of a CFG pile from a redundant CFG pile head, and a sealing rod mechanism with the bottom connected with the sealing mechanism and used for opening or closing the sealing mechanism; after pouring and tube drawing of the CFG pile are completed, the sealing mechanism is opened, the sealing mechanism is buried in the CFG pile through the downward pressing mechanism, the sealing mechanism is located at the elevation position of the top of the CFG pile, the sealing mechanism is closed through operation of the sealing rod mechanism, and therefore the CFG pile and the pile head are separated. The device can be processed and prefabricated in factories or construction sites according to different pile diameters and user requirements, and is not limited by the pile diameters. And devices with different heights can be manufactured according to different elevations of the working face higher than the designed pile top during construction.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction, and in particular to a CFG pile head-cutting-free device and a use method thereof. Background Art

[0002] According to the requirements of the technical specifications for foundation treatment, the working surface should be 300mm to 500mm higher than the designed pile top elevation during construction. Therefore, the working surface will be higher than the designed pile top elevation during construction. After the CFG pile construction is completed, the piles will be cut, and 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 existing methods use 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 designed pile top elevation, and remedial measures need to be taken. At the same time, since the soil between the piles will inevitably reduce the bearing capacity of the composite foundation, the process is cumbersome and time-consuming, which can no longer meet the needs of fast construction. Using a cutting machine for circular cutting will cause loud noise and serious dust pollution at the operation site. In addition, due to the limitation of the small working space, it is impossible to effectively use mechanical equipment to cut off the pile head, resulting in serious loss of energy and labor consumption. For example, the Chinese patent publication number CN219992450U discloses a new type of CFG pile cutting device using a circular cutting method, which includes a frame, a pile fixing mechanism, a cutting mechanism and a rotary drive mechanism; the frame includes a main frame and a rotary frame, and the rotary frame rotates around its own central axis and is arranged on the main frame; the pile fixing mechanism is installed on the rotary frame for fixing the CFG pile body so that the CFG pile and the rotary frame are coaxially arranged; the rotary drive mechanism is installed on the main frame and connected to the rotary frame for driving the rotary frame to rotate; the cutting mechanism is installed on the rotary frame and rotates synchronously with the rotary frame for cutting the CFG pile. The patented cutting machine performs circular cutting, and the operation site is noisy and seriously polluted by dust. In addition, due to the limitation of the narrow working space, it is impossible to effectively use mechanical equipment to cut off the pile head, resulting in serious loss of energy and labor.

[0003] Therefore, it is a problem worthy of research to provide a CFG pile head-free cutting device and a method of using the device, which is easy to operate, can avoid manual excavation of earthwork and cutting of CFG pile heads, and does not increase additional work on site. Summary of the Invention

[0004] The purpose of the present invention is to provide a CFG pile head-free cutting device and a method for using the device, which is easy to operate, can avoid manual excavation of earthwork and CFG pile head cutting, and does not increase additional work on site.

[0005] The object of the present invention is achieved like this: A CFG pile head-free cutting device comprises 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 redundant 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 poured and the pipe is removed, the closing mechanism is opened and buried in the CFG pile by the pressing mechanism. The closing mechanism is located at the elevation of the CFG pile top and is closed by operating the closing rod mechanism to separate the CFG pile from the pile head.

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

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

[0008] The large closed component includes a circular large closed rotating shaft inner core fixedly connected to the bottom of the lower pressure rod, and a plurality of large closed bodies sleeved on the large closed rotating shaft inner core. The plurality of large closed bodies sleeved on the large closed rotating shaft inner core form a circular ring.

[0009] The large closed body comprises a large closed rotating outer shaft which is sleeved on the large closed rotating shaft inner core and rotates relative to the large closed rotating shaft inner core, and a large closed plate which is fixedly connected to the outer surface of the large closed rotating outer shaft.

[0010] The small closed component includes a small closed rotating shaft inner core, whose two ends are fixedly connected to the inner side of the large closed component through connecting plates, a small closed outer rotating shaft sleeved on the small closed rotating shaft inner core and rotating relative to the small closed rotating shaft inner core, and a small closed plate fixedly connected to the outer surface of the small closed outer rotating shaft.

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

[0012] A method for using a CFG pile head-cutting-free device comprises the following steps: S1. Drilling rig in place: After drilling rig is in place, calibrate the position and verticality of the drill rod, with the deviation not exceeding 1%; S2. Mixing of mixture: Prepare the mixture according to the designed proportion, and the slump of the mixture should be 160mm~200mm; S3. Drilling: When drilling begins, close the drill valve, move the drill rod downward until the drill bit touches the ground, start the motor, rotate the drill rod and sink it to the designed elevation, turn off the motor, and clean the soil around the hole. Drill the hole slowly first and then quickly to avoid shaking the drill rod. Check and correct drill rod deviation in a timely manner. S4. Grouting and pipe pulling: After the CFG pile is bored to the designed elevation, stop drilling and start pumping the mixture. When the drill pipe core tube is filled with the mixture, start pulling the pipe. The lifting speed of the pile is 2m / min-3m / min. The pile-making process is carried out continuously to avoid suspension of work due to problems in material supply. S5. Move the machine: Before moving the machine, clean and identify the next pile position to ensure the accuracy of the pile position. If necessary, clean the drill rod and drill bit after moving the machine; S6. After the CFG pile is poured and the tube is removed, the closing mechanism is buried in the CFG pile through the pressing ring and the pressing rod. At this time, the large closing plate and the small closing plate are in the vertically open state, and the bottom surface of the closing mechanism is the same as the design elevation; S7. After the concrete settles and becomes dense, the closing mechanism is pressed down to the design elevation using the lower pressure ring, and the large and small closing plates are pressed down using the closing rod device. The large closing plate is rotated through the inner core of the large closed rotating shaft to a horizontal position, which is the design elevation. The small closing plate is rotated through the inner core of the small closed rotating shaft to a horizontal position, which is the design elevation. S8. The closing rod of the closing rod mechanism makes the leveling rod perpendicular to the small closing rotation outer axis, so that both the large closing plate and the small closing plate are locked at the design elevation. After the pile is formed, the large closing plate and the small closing plate act as a dividing force to divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation construction, mechanical excavation can be directly adopted without the need for pile cutting process. The pile body above the design elevation will be excavated along with the soil between the piles, and the surface of the pile head will be flat to avoid the pile body below the pile top elevation from breaking and disturbing the soil between the piles.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention can be prefabricated in a factory or on-site according to different pile diameters and user requirements, and is not limited by the pile diameter. Devices of different heights can be produced according to the height of the working surface above the designed pile top during construction.

[0014] 2. The present invention divides the CFG piles in advance by means of large and small closing plates. During earth excavation, the CFG piles and the soil between the piles can be cleaned together by machinery. The process is simple, time-consuming, and reduces construction costs and increases machinery utilization.

[0015] 3. The new process eliminates the need for cutting the pile heads and manual excavation. Mechanical excavation is sufficient, and mechanical excavation is highly efficient. Excavating approximately 100 CFG piles takes approximately 1 to 2 days. Costs are relatively low and are only affected by transportation distance.

[0016] 4. The use of the present invention makes the top elevation of the CFG pile flush with the design elevation, the pile top surface is flat, and the molding effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a three-dimensional diagram of the present invention.

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

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

[0021] Figure 5 Schematic diagram of the structure of the closing rod device of the present invention.

[0022] Figure 6 The structure of the closing plate device of the present invention is schematically shown. Figure 1 ; Figure 7 The structure of the closing plate device of the present invention is schematically shown. Figure 2 ; The figure shows: 1-large closed rotating shaft inner core, 2-large closed rotating outer shaft, 3-downward pressure rod, 4-downward pressure ring, 5-large closing plate, 6-closing rod mechanism, 7-small closed rotating shaft inner core, 8-small closed outer rotating shaft, 9-small closing plate, 10-bolt, 10a-blind hole, 11-leveling rod; 12-closing rod, 13-operating handle, 14-connecting hole. DETAILED DESCRIPTION

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

[0024] like Figure 1 and Figure 2 As shown, a CFG pile head-free cutting device 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 poured and the pipe is pulled out, the closing mechanism is opened and buried in the CFG pile by the pressing mechanism. The closing mechanism is located at the elevation position of the CFG pile top. The closing mechanism is closed by operating the closing rod mechanism to achieve separation of the CFG pile from the pile head.

[0025] like Figure 3 and Figure 4As shown, the downward pressure mechanism includes a horizontal downward pressure ring 4, a vertical downward pressure rod 3 fixedly connected to the lower surface of the downward pressure ring 4 by welding, and the bottom of the downward pressure rod 3 is fixedly connected to the closing mechanism. The downward pressure ring 4 is made of 25mm diameter round steel bar and has a diameter equal to the pile hole diameter.

[0026] The material of the down-press rod 3 is a smooth round steel bar with a diameter of 25 mm. The length of the down-press rod 3 is from the design elevation of the pile top to the construction surface height. The diameter can be adjusted according to the length of the down-press rod 3 to meet the force transmission conditions without wasting costs.

[0027] like Figure 6 、 Figure 7 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 sealing component and the small sealing component work together to compact and seal the top of the CFG pile. The large sealing component includes a large closed rotating shaft inner core 1 fixedly connected to the bottom of the lower pressure rod 3 by welding and in a circular shape, a plurality of large sealing bodies sleeved on the large closed rotating shaft inner core 1, and the plurality of large sealing bodies sleeved on the large closed rotating shaft inner core 1 to form a circular ring. The large sealing body includes a large closed rotating outer shaft 2 sleeved on the large closed rotating shaft inner core 1 and rotating relative to the large closed rotating shaft inner core 1, and a large sealing plate 5 fixedly connected to the outer surface of the large closed rotating outer shaft 2. The large closed rotating outer shaft 2 is sleeved on the large closed rotating shaft inner core 1 and is disconnected at the welding point between the lower pressure rod 3 and the large closed rotating shaft inner core 1, so that each large sealing plate 5 can rotate independently. The outer diameter of the large closed rotating outer shaft 2 is equal to the pile diameter. Four large enclosing plates 5 are provided, arranged in a fan-shaped pattern. Both the large and small enclosing plates are made of aluminum. The large enclosed rotating outer shaft is made of a 5mm thick hollow aluminum tube with an outer diameter of 28mm. Its length is equal to the circumference of the large enclosed rotating outer shaft minus one-quarter the diameter of the four downward-pressing rods. The inner core of the large enclosed rotating shaft is made of 25mm smooth round steel bars.

[0028] The small closed assembly includes a small closed rotating shaft inner core 7, whose ends are fixedly connected to the inner side of the large closed plate 5 via connecting plates, a small closed outer rotating shaft 8 that is sleeved on the small closed rotating shaft inner core 7 and rotates relative to the small closed rotating shaft inner core 7, and a small closed plate 9 that is fixedly connected to the outer surface of the small closed outer rotating shaft 8. The small closed outer rotating shaft 8 rotates relative to the small closed rotating shaft inner core 7, thereby causing the small closed outer rotating shaft 8 and the small closed plate 9 to rotate synchronously, thereby realizing the rotation of the small closed plate 9. The small closed rotating shaft inner core is made of 6mm smooth round steel bar and is 190mm long.

[0029] like Figure 5As shown, the closing rod mechanism 6 includes a connecting hole 14 located on the small closing plate 9, a closing rod 12 with a bolt assembly passing through the bottom of the connecting hole 14, an operating handle 13 fixedly connected to the top of the closing rod 12, and a leveling rod 11 located at the lower part of the closing rod 12; the distance between the leveling rod 11 and the bottom of the closing rod 12 is greater than the thickness of the small closing plate 9, so that the closing rod 12 can rotate relative to the small closing plate 9, and the closing rod 12 can also be located in the vertical direction when the large closing plate 5 and the small closing plate 9 are both in the vertical direction. The bolt assembly includes a blind hole 10a located at the bottom of the closing rod 12 and arranged along the length direction of the closing rod 12, and a flat head bolt threadedly connected to the blind hole 10a. The head diameter of the flat head bolt is larger than the connecting hole 14, which prevents the closing rod 12 from separating from the small closing rod 9. When in use, after the CFG pile is poured and the pipe is removed, the small closing plate 9 and the large closing plate 5 are located in the vertical direction, and then the pressure ring 4 is pressed downward with force to make the pressure rod 3 drive the closing 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 the force point to transmit the force to the large closing plate and the small closing plate through the closing rod 12, and the large closing plate and the small closing plate are rotated around the large closed rotating shaft inner core 1 and the small closed rotating shaft inner core 7 respectively, so that the large closing plate 9 and the small closing plate 5 are in a horizontal position in turn, realizing the separation of the CFG pile top 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 comprises the following steps: S1. Drilling rig in place: After drilling rig is in place, calibrate the position and verticality of the drill rod, with the deviation not exceeding 1%; S2. Mixing of mixture: Prepare the mixture according to the designed proportion, and the slump of the mixture should be 160mm~200mm; S3. Drilling: When drilling begins, close the drill valve, move the drill rod downward until the drill bit touches the ground, start the motor, rotate the drill rod and sink it to the designed elevation, turn off the motor, and clean the soil around the hole. Drill the hole slowly first and then quickly to avoid shaking the drill rod. Check and correct drill rod deviation in a timely manner. S4. Grouting and pipe pulling: After the CFG pile is bored to the designed elevation, stop drilling and start pumping the mixture. When the drill pipe core tube is filled with the mixture, start pulling the pipe. The lifting speed of the pile is 2m / min-3m / min. The pile-making process is carried out continuously to avoid suspension of work due to problems in material supply. S5. Move the machine: Before moving the machine, clean and identify the next pile position to ensure the accuracy of the pile position. If necessary, clean the drill rod and drill bit after moving the machine; S6. After the CFG pile is poured and the tube is removed, the closing mechanism is buried in the CFG pile through the pressing ring and the pressing rod. At this time, the large closing plate and the small closing plate are in the vertically open state, and the bottom surface of the closing mechanism is the same as the design elevation; S7. After the concrete settles and becomes dense, the closing mechanism is pressed down to the design elevation using the lower pressure ring. The large and small closing plates are pressed down using the closing rod device. The closing rod moves simultaneously to the center position and downward direction of the lower pressure ring, so that the large closing plate rotates through the inner core of the large closed rotating shaft to a horizontal position, which is the design elevation, and the small closing plate rotates through the inner core of the small closed rotating shaft to a horizontal position, which is the design elevation. S8. The closing rod of the closing rod mechanism makes the leveling rod perpendicular to the small closing rotation outer axis, so that both the large closing plate and the small closing plate are locked at the design elevation. After the pile is formed, the large closing plate and the small closing plate act as a dividing force to divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation construction, mechanical excavation can be directly adopted without the need for pile cutting process. The pile body above the design elevation will be excavated along with the soil between the piles, and the surface of the pile head will be flat to avoid the pile body below the pile top elevation from breaking and disturbing the soil between the piles.

Claims

1. A CFG pile head-free 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 redundant CFG pile head, and a closing rod mechanism whose bottom is connected to the closing mechanism and used to open or close the closing mechanism. After the CFG pile is poured and the tube is pulled out, the closing mechanism is opened and buried in the CFG pile through the pressing mechanism. The closing mechanism is located at the elevation position of the CFG pile top and is closed by operating the closing rod mechanism to achieve the separation of the CFG pile and the pile head.

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

3. The CFG pile head-cutting-free device according to claim 1, characterized in that: The closing mechanism includes a large closing component connected to the bottom of the pressing mechanism and a small closing component connected to the inner side of the large closing component. The large closing component and the small closing component work together to compact and seal the top of the CFG pile.

4. The CFG pile head-cutting-free device according to claim 3, characterized in that: The large closed component includes a circular large closed rotating shaft inner core fixedly connected to the bottom of the pressing mechanism, and a plurality of large closed bodies sleeved on the large closed rotating shaft inner core, and the plurality of large closed bodies sleeved on the large closed rotating shaft inner core to form a circular ring.

5. The CFG pile head-cutting-free device according to claim 4, characterized in that: The large closed body comprises a large closed rotating outer shaft which is sleeved on the large closed rotating shaft inner core and rotates relative to the large closed rotating shaft inner core, and a large closed plate which is fixedly connected to the outer surface of the large closed rotating outer shaft.

6. The CFG pile head-cutting-free device according to claim 3, characterized in that: The small closed component includes a small closed rotating shaft inner core, whose two ends are fixedly connected to the inner side of the large closed component through connecting plates, a small closed outer rotating shaft sleeved on the small closed rotating shaft inner core and rotating relative to the small closed rotating shaft inner core, and a small closed plate fixedly connected to the outer surface of the small closed outer rotating shaft.

7. The CFG pile head-cutting-free device according to claim 6, characterized in that: The closing rod mechanism includes a connecting hole located on the small closing plate, a closing rod with a bolt assembly passing through the bottom of the connecting hole, an operating handle fixedly connected to the top of the closing rod, and a leveling rod located at the bottom of the closing rod; the distance between the leveling rod and the bottom of the closing rod is greater than the thickness of the small closing plate, so that the closing rod can rotate relative to the small closing plate, and when the large closing plate and the small closing plate are both in a vertical direction, the closing rod is also in a vertical direction.

8. A method for using the CFG pile head-cutting-free device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Drilling rig in place: After drilling rig is in place, calibrate the position and verticality of the drill rod, with the deviation not exceeding 1%; S2. Mixing of mixture: Prepare the mixture according to the designed proportion, and the slump of the mixture should be 160mm~200mm; S3. Drilling: When drilling begins, close the drill valve, move the drill rod downward until the drill bit touches the ground, start the motor, rotate the drill rod and sink it to the designed elevation, turn off the motor, and clean the soil around the hole. S4. Grouting and pipe pulling: After the CFG pile is bored to the designed elevation, stop drilling and start pumping the mixture. When the drill pipe core tube is filled with the mixture, start pulling the pipe. The lifting speed of the pile is 2m / min-3m / min. The pile-making process is carried out continuously to avoid suspension of work due to problems in material supply. S5. Moving the machine: Clean and identify the next pile position before moving the machine; S6. After the CFG pile is poured and the tube is removed, the closing mechanism is buried in the CFG pile through the pressing ring and the pressing rod. At this time, the large closing plate and the small closing plate are in the vertically open state, and the bottom surface of the closing mechanism is the same as the design elevation; S7. After the concrete settles and becomes dense, the closing mechanism is pressed down to the design elevation using the lower pressure ring, and the large and small closing plates are pressed down using the closing rod device. The large closing plate is rotated through the inner core of the large closed rotating shaft to a horizontal position, which is the design elevation. The small closing plate is rotated through the inner core of the small closed rotating shaft to a horizontal position, which is the design elevation. S8. The closing rod of the closing rod mechanism makes the leveling rod perpendicular to the small closing rotation outer axis, so that both the large closing plate and the small closing plate are locked at the design elevation. After the pile is formed, the large closing plate and the small closing plate act as a dividing force to divide the CFG pile into two separate parts with the design elevation as the interface. S9. In the subsequent earthwork excavation construction, mechanical excavation can be directly adopted without the need for pile cutting process. The pile body above the design elevation will be excavated along with the soil between the piles, and the surface of the pile head will be flat to avoid the pile body below the pile top elevation from breaking and disturbing the soil between the piles.

Images