Pile foundation construction device

Abstract

The present invention relates to the technical field of pile hole mechanical equipment, and specifically discloses a pile foundation construction device, comprising a drill tube, a locking mechanism, an upper base plate and a lower base plate, the upper base plate being hinged on the lower end of the drill tube, and the lower base plate being rotatably mounted on the lower end surface of the upper base plate, the upper base plate and the lower base plate being respectively provided with a through hole one and a through hole two for feeding into the drill tube, a plurality of telescopic plates one being arranged in the through hole one along the radial direction of the upper base plate, and the plurality of telescopic plates one gradually increase in length from the inside to the outside, the telescopic plates one being slidably mounted on the upper base plate along the circumferential direction of the upper base plate, an elastic member one being arranged between the telescopic plate one and the upper base plate, when the drill tube is full, the upper base plate is reversed, so that the telescopic plate one blocks the through hole two, and when there is a stone in the through hole one, the telescopic plate one will compress the elastic member one after abutting against the stone; the beneficial effects of the present invention are as follows: the influence of the stone on the drilling tube blocking can be reduced, thereby improving the efficiency of pile foundation construction.

Description

Technical Field

[0001] This invention relates to the field of pile hole machinery and equipment technology, and specifically to a pile foundation construction device. Background Art

[0002] Pile foundation construction is a crucial foundational step in building engineering. First, precise pile location surveying and layout are essential to determine the accurate position of each pile. Then, depending on the pile type, such as cast-in-place piles or precast piles, appropriate construction is carried out. For cast-in-place piles, drilling begins, ensuring verticality and depth meet design requirements while maintaining borehole stability. Next, the reinforcing cage is lowered, and concrete is poured into the borehole. For precast piles, the precast pile body is driven into the ground to the predetermined depth using pile driving equipment. During driving, strict control of pile verticality and driving speed is crucial to ensure the pile can stably bear the load of the superstructure. The entire pile foundation construction process must be strictly carried out in accordance with construction specifications to guarantee the stability of the building foundation.

[0003] Chinese patent document CN113982490B discloses a rotary drilling bit and rotary drilling method suitable for mudstone formations. It includes a drill barrel, a locking mechanism, an upper base plate, and a lower base plate. The upper base plate is connected to the lower part of the drill barrel and can cooperate with the locking mechanism to close and open the drill barrel. The lower base plate is rotatably connected to the upper base plate, and drill teeth are provided at the bottom of the lower base plate. The locking mechanism is used to control the closing of the drill bit to accommodate drill cuttings and to open and dump drill cuttings. As the rotary drilling rig rotates and lowers the drill rod, the guide teeth first contact the working face and cut into the working surface. After the working face is positioned, the extended cutting tooth contacts the working face and begins drilling. Under the combined action of frictional resistance and the limiting block, the lower base plate rotates around the upper base plate until the slag inlet of the upper base plate is fully open, and the drill cuttings enter the drill barrel through the slag inlet. After completing a certain depth of operation, the rotary drilling rig reverses the drill rod. Under the action of frictional resistance and the limiting block, the lower base plate rotates around the upper base plate until the slag inlet of the upper base plate is fully closed. The rotary drilling rig lifts the drill rod and moves it to the slag discharge point. The rotary drilling rig is then controlled to press down the through shaft to open the locking mechanism, and the upper base plate opens to complete the slag discharge action.

[0004] In the aforementioned technology, during the process of the drill rod reversing and causing the lower base plate to rotate around the upper base plate to close the slag inlet, if there are stones at the slag inlet, the lower and upper base plates will be blocked by the stones and will not be able to completely close the slag inlet. Consequently, during the process of the drill barrel rising, the soil inside the drill barrel will fall from the slag inlet, reducing construction efficiency. Summary of the Invention

[0005] This invention provides a pile foundation construction device, which aims to solve the technical problem in related technologies where the lower and upper base plates are blocked by stones, preventing the slag inlet from being completely closed, which in turn causes the soil inside the drill pipe to fall from the slag inlet, reducing construction efficiency.

[0006] A pile foundation construction device includes a drill barrel, a locking mechanism, an upper base plate, and a lower base plate. The upper base plate is hinged to the lower end of the drill barrel, and the lower base plate is rotatably mounted on the lower end face of the upper base plate. The upper and lower base plates are respectively provided with a through hole one and a through hole two for feeding material into the drill barrel. The device also includes: Multiple arc-shaped telescopic plates are arranged radially within the through hole 1 of the upper base plate, with the length of the telescopic plates gradually increasing from the inside to the outside. The telescopic plates are slidably mounted on the upper base plate along the circumferential direction. An elastic element is provided between the telescopic plates and the upper base plate. When the drill barrel is full, the upper base plate reverses, thereby blocking the through hole 2 with the telescopic plates. When there are stones in the through hole 1, the telescopic plates will compress the elastic element 1 after contacting the stones. The locking assembly is installed on the upper base plate. After the second through hole is sealed, the upper base plate and the lower base plate are locked.

[0007] Its effect is that by setting multiple telescopic plates, when there are stones in through holes one and two, the telescopic plates one that are not in contact with the stones can continue to block through hole two, thereby reducing the impact caused by the stones.

[0008] Preferably, a rotating frame and a drive assembly for driving the rotating frame to rotate are rotatably mounted on the upper base plate. Multiple arc-shaped telescopic plates II are arranged on the rotating frame along the radial direction of the drill barrel, and the length of the multiple telescopic plates II gradually increases from the inside to the outside. The telescopic plates II are slidably mounted on the rotating frame along the circumference of the drill barrel. An elastic element II is arranged between the telescopic plates II and the upper base plate. When the through hole II is opened, the telescopic plates I and II are located on the front and rear sides of the through hole II, respectively. When the drill barrel is full, the telescopic plates I and II on both sides of the through hole II move closer to each other to block the through hole II.

[0009] Its effect is as follows: by setting multiple telescopic plates II, when sealing through hole II, telescopic plates I and II are brought close to each other to seal through hole II. If there are stones blocking through hole I and through hole II, telescopic plates I and II can clamp them from the front and rear sides of the stones, preventing telescopic plates I from being unable to push the stones to move. This would result in a gap between the other side of the stone and the bottom plate when the drill pipe is lifted, which would cause the soil inside the drill pipe to slip and reduce the efficiency of pile foundation construction.

[0010] Preferably, the drive assembly includes a gear rotatably mounted on the lower base plate, a gear ring one fixedly mounted on the upper base plate, and a gear ring two fixedly mounted on the rotating frame, with the upper and lower sides of the gear meshing with gear ring one and gear ring two, respectively.

[0011] Preferably, both the telescopic plate one and the telescopic plate two have protrusions at their adjacent ends for contacting the stone.

[0012] Preferably, the protrusion is provided with a vibration motor that causes the protrusion to vibrate.

[0013] Its effect is to reduce the resistance of the soil when the telescopic plate 1 and telescopic plate 2 approach each other.

[0014] Preferably, both the inner arc surfaces of the telescopic plate one and the telescopic plate two are provided with arc-shaped track grooves, and both the outer arc surfaces of the telescopic plate one and the telescopic plate two are provided with arc-shaped sliding strips for cooperating with adjacent track grooves.

[0015] Its effect is that by setting the track groove and the arc-shaped slide bar, the bearing capacity of the telescopic plate one and telescopic plate two on the soil inside the drill barrel is improved, thereby increasing the service life of the equipment.

[0016] Preferably, the locking assembly includes a locking block that is slidably mounted on the outer circumferential surface of the upper base plate in the radial direction and a drive source one for driving the locking block to move. When the through hole two is blocked, the drive source one drives the locking block to move outward and abut against the lower base plate.

[0017] Its effect is as follows: by setting a locking component, when the second through hole is blocked, the upper and lower base plates are locked, thereby preventing the lower base plate from rotating relative to the upper base plate when the drill barrel is lifted due to the release of the elastic potential energy stored in the elastic elements one and two when there are stones in the first through hole. This would open the second through hole and cause the soil in the drill barrel to slide down.

[0018] Preferably, the drive source one includes a lead screw one disposed in the upper base plate and a motor one whose output end is connected to the lead screw one, and the lead screw one is threadedly engaged with the locking block.

[0019] Preferably, the locking mechanism includes a connecting hook disposed on the upper base plate, a locking block slidably disposed on the drill barrel in the horizontal direction, and a second driving source for driving the locking block to move. The side of the connecting hook is provided with a groove for engaging with the locking block. When the upper base plate is coaxial with the drill barrel, the locking block is engaged in the groove.

[0020] Preferably, the second drive source includes a second lead screw mounted on the drill barrel and a second motor whose output end cooperates with the second lead screw, and the second lead screw is threadedly engaged with the locking block.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are as follows: During pile foundation construction, when the rotary drilling rig is excavating holes in the ground, if there are stones in both holes 1 and 2 when the drill cylinder is reversed to seal through hole 2 after it is full, the holes cannot be completely sealed. Therefore, during the lifting of the drill cylinder, the soil and stones inside will slide down, reducing construction efficiency. By setting up telescopic plates 1 and 2, if there are stones in through holes 1 and 2 during the sealing process, since multiple telescopic plates 1 and 2 are set, the ones that come into contact with the stones will clamp the stones, while the remaining ones will continue to seal the areas without stones. This reduces the impact of stones on sealing through holes 1 and 2, thereby improving the construction efficiency of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the base plate mechanism of the present invention.

[0024] Figure 3 This is an exploded view of the base plate mechanism of the present invention.

[0025] Figure 4 This is a schematic diagram of the drill barrel structure of the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the base plate of the present invention.

[0027] Figure 6 This is a schematic diagram of the structure of the bottom plate of the present invention.

[0028] Reference numerals: 1. Drill barrel; 2. Base plate mechanism; 21. Upper base plate; 211. Through hole one; 212. Rotary shaft hole; 213. Mounting rod one; 214. Limiting block; 22. Lower base plate; 221. Through hole two; 222. Rotary shaft; 223. Inclined surface; 224. Rotary drilling tooth; 23. Sealing assembly; 231. Telescopic plate one; 232. Rotating frame; 233. Telescopic plate two; 234. Protrusion; 235. Gear; 236. Gear ring one; 237. Gear ring two; 24. Locking block; 25. Lead screw one; 3. Locking mechanism; 31. Connecting hook; 32. Locking block; 33. Lead screw two. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figure 1As shown in the figure, a pile foundation construction device according to an embodiment of the present invention includes a rotary drilling rig (not shown) and a drill bit. The drill bit is installed on the drill rod of the rotary drilling rig and is used to drill holes in the pile foundation.

[0031] like Figure 1 As shown, the drill bit includes a drill barrel 1, a base plate mechanism 2, and a locking mechanism 3. The drill barrel 1 is installed on the drill rod of the rotary drilling rig and is used to store soil and rocks. The base plate mechanism 2 is located at the bottom end of the drill barrel 1. The locking mechanism 3 is used to fix the base plate mechanism 2 and the drill barrel 1. When the drill barrel 1 rotates forward, the base plate mechanism 2 guides the soil and rocks into the drill barrel 1. When the drill barrel 1 rotates in reverse, the base plate mechanism 2 seals the bottom end of the drill barrel 1.

[0032] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the base plate mechanism 2 includes an upper base plate 21, a lower base plate 22, two sets of sealing components 23, and a locking component. The upper base plate 21 is hinged to the lower end face of the drill barrel 1. An upwardly extending rotating shaft 222 is fixedly installed at the center of the lower base plate 22. A vertically penetrating rotating shaft hole 212 is opened at the center of the upper base plate 21, and the rotating shaft 222 is rotatably installed in the rotating shaft hole 212. Two vertically penetrating fan-shaped through holes 211 are opened on the upper base plate 21, and the two through holes 211 are arranged in a circular array around the axis of the upper base plate 21. Two vertically penetrating fan-shaped through holes 221 are opened on the lower base plate 22, and the two through holes 221 are arranged in a circular array around the axis of the lower base plate 22. Inclined surfaces 223 are respectively provided on the hole walls of the two through holes 221 along the radial direction of the lower base plate 22. The two inclined planes 223 are arranged in a circular array around the axis of the lower base plate 22. Multiple rotary drilling teeth 224 are installed on the inclined planes 223. The rotary drilling teeth 224 are used to break up the soil and guide it into the drill barrel 1. Limiting blocks 214 are fixedly installed on the lower end face of the upper base plate 21. When the first through hole 211 and the second through hole 221 are connected, the limiting blocks 214 are used to block and limit the lower base plate 22. During the excavation process, the soil passes through the first through hole 211 and the second through hole 221 and enters the drill barrel 1. Two sets of sealing components 23 are respectively set in the two first through holes 211 to seal the second through hole 221. The two sets of sealing components 23 are arranged in a circular array around the axis of the upper base plate 21. Locking components are set on the upper base plate 21 to lock the upper base plate 21 and the lower base plate 22.

[0033] In the initial state, through hole 221 is blocked by the sealing component 23, and through hole 211 is blocked by the lower base plate 22. When the rotary drilling tooth 224 comes into contact with the ground and the drill barrel 1 rotates forward, the rotary drilling tooth 224 is subjected to the friction force of the ground, which causes the lower base plate 22 and the upper base plate 21 to rotate relative to each other until through hole 211 and through hole 221 are connected. Then, the lower base plate 22 comes into contact with the limiting block 214. Then, when the upper base plate 21 rotates, it drives the lower base plate 22 to rotate through the limiting block 214.

[0034] like Figure 3 、 Figure 5 As shown, the sealing assembly 23 includes multiple arc-shaped telescopic plates 231, a rotating frame 232, multiple arc-shaped telescopic plates 233, and a drive assembly. Multiple fan-shaped mounting rods 213 are installed on the wall of the through hole 211. All mounting rods 213 are coaxial with the upper base plate 21, and their length gradually increases from the inside to the outside. Multiple telescopic plates 231 are respectively sleeved on the mounting rods 213 along the radial direction of the upper base plate 21. The length of the multiple telescopic plates 231 gradually increases from the inside to the outside. All 31 are coaxial with the upper base plate 21. An elastic element is installed between the telescopic plate 231 and the mounting rod 213. The elastic element is a compression spring (not shown in the figure). The two ends of the compression spring are connected to the telescopic plate 231 and the mounting rod 213 respectively. The rotating frame 232 is sleeved on the rotating shaft 222. Two sets of mounting rods are provided on the rotating frame 232. The two sets of mounting rods are arranged in a circular array around the axis of the rotating frame 232. The mounting rods are composed of multiple fan-shaped mounting rods. All the multiple mounting rods are coaxial with the rotating frame 232, and multiple mounting rods in the same group are coaxial with the rotating frame 232. The length of the mounting rod 2 gradually increases from the inside to the outside. Multiple telescopic plates 233 are respectively fitted onto the mounting rod 2 along the radial direction of the upper base plate 21. The length of the multiple telescopic plates 233 gradually increases from the inside to the outside, and all of the multiple telescopic plates 233 are coaxial with the rotating frame 232. An elastic element 2, which is a compression spring 2 (not shown in the figure), is installed between the telescopic plates 233 and the mounting rod 2. The ends of the telescopic plates 231 and 233 that are close to each other are movably mounted with... The protrusion 234 is used to abut against the stone. The protrusion 234 is equipped with a vibrating motor (not shown in the figure) to make the protrusion 234 vibrate. When the telescopic plate 1 231 and the telescopic plate 233 approach each other, the vibrating motor starts, thereby reducing the resistance of the soil encountered by the telescopic plate 1 231 and the telescopic plate 233 when they approach each other. The inner arc surface of the telescopic plate 1 231 and the telescopic plate 233 are provided with arc-shaped track grooves, and the outer arc surface of the telescopic plate 1 231 and the telescopic plate 233 are provided with arc-shaped sliding strips for cooperating with the adjacent track grooves.

[0035] When the second through hole 221 is opened, the first telescopic plate 231 and the second telescopic plate 233 are located on the front and rear sides of the second through hole, respectively. When the drill barrel 1 is full, the drill barrel 1 reverses and drives the upper base plate 21 to reverse. At this time, the lower base plate 22 is subjected to the friction of the ground and thus rotates relative to the upper base plate 21. At the same time, the drive assembly drives the rotating frame 232 to rotate in the opposite direction relative to the upper base plate 21, so that the multiple first telescopic plates 231 and multiple second telescopic plates 233 start to approach each other from the front and rear sides of the second through hole 221 to block the second through hole 221. When there are stones in the first through hole 211, the first telescopic plate 231 and the second telescopic plate 233 will compress the first and second compression springs respectively after they come into contact with the stones, thereby clamping the stones.

[0036] like Figure 3 、 Figure 5 As shown, the drive assembly includes a gear 235, a gear ring 1 236, and a gear ring 237. A gear shaft extends outward along the radial direction of the rotating shaft 222. The gear 235 is rotatably mounted on the gear shaft. The gear ring 1 236 is fixedly mounted on the upper end face of the upper base plate 21, and the gear ring 237 is fixedly mounted on the lower end face of the rotating frame 232. The upper and lower ends of the gear 235 mesh with the gear ring 237 and the gear ring 1 236, respectively. When the lower base plate 22 rotates relative to the upper base plate 21 due to friction from the ground, the upper base plate 21 rotates, and the gear 235 is driven to rotate through the gear ring 1 236, which in turn drives the gear ring 237 to rotate in the opposite direction, thereby causing the telescopic plates 1 231 and 233 on the front and rear sides of the through hole 221 to move closer to each other.

[0037] like Figure 2 、 Figure 3 、 Figure 5 As shown, the locking assembly includes a locking block 24 and a drive source one. The locking block 24 is slidably mounted on the outer circumferential surface of the upper base plate 21 along the radial direction of the upper base plate 21. The drive source one is used to drive the locking block 24 to move. When the through hole two 221 is blocked, the drive source one drives the locking block 24 to move outward and abut against the lower base plate 22, thereby locking the upper base plate 21 and the lower base plate 22.

[0038] like Figure 2 、 Figure 3 、 Figure 5 As shown, the drive source includes a lead screw 25 rotatably mounted in the upper base plate 21 and a motor (not shown in the figure) whose output end is connected to the lead screw 25. The lead screw 25 is threadedly engaged with the locking block 24.

[0039] like Figure 2 、 Figure 3As shown, the locking mechanism 3 includes a connecting hook 31, a locking block 32, and a second drive source. The connecting hook 31 is installed on the upper end face of the upper base plate 21. The locking block 32 is slidably installed on the drill barrel 1 in the horizontal direction. The side of the connecting hook 31 is provided with a groove for cooperating with the locking block 32. When the drill bit is digging a hole, the upper base plate 21 is coaxial with the drill barrel 1. At this time, the second drive source drives the locking block 32 to engage in the groove. When the drill barrel 1 is full, after the drill barrel 1 is withdrawn from the pile foundation hole, the second drive source drives the locking block 32 to withdraw from the groove. At this time, the upper base plate 21 and the lower base plate 22 flip downward under the action of gravity, and then the soil and stones in the drill barrel 1 slide out of the drill barrel 1.

[0040] like Figure 4 As shown, the second drive source includes a second lead screw 33 rotatably mounted on the drill barrel 1 and a second motor 2 whose output end cooperates with the second lead screw 33. The second lead screw 33 is threadedly engaged with the locking block 32.

[0041] The specific working principle of this invention embodiment: When drilling into the ground, the rotary drilling rig controls the drill bit to make contact with the ground and then controls the drill bit to rotate clockwise. The rotary drilling teeth 224 are subjected to the friction force of the ground, causing the lower base plate 22 and the upper base plate 21 to rotate relative to each other until the first through hole 211 and the second through hole 221 are connected. Then, the lower base plate 22 abuts against the limiting block 214. Then, when the upper base plate 21 rotates, it drives the lower base plate 22 to rotate through the limiting block 214. When the drill barrel 1 is full, the drill barrel 1 reverses and drives the upper base plate 21 to reverse. At this time, the lower base plate 22 is subjected to the friction force of the ground and thus rotates relative to the upper base plate 21. As the upper base plate 21 rotates, the upper base plate 21 rotates through the toothed ring 1. 236 drives gear 235 to rotate, which in turn drives gear ring 237 to rotate in the opposite direction, so that telescopic plates 231 and 233 on the front and rear sides of through hole 221 move closer to each other to block through hole 221. When there are stones in through hole 211, telescopic plates 231 and 233 will compress springs 1 and 2 respectively after contacting the stones, thus clamping the stones. When drill barrel 1 exits from the pile hole, motor 2 drives the locking block 32 to exit the groove. At this time, the upper base plate 21 and lower base plate 22 flip downward under the action of gravity, and then the soil and stones in drill barrel 1 slide out of drill barrel 1.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pile foundation construction device, comprising a drill tube (1), a locking mechanism (3), an upper base plate (21) and a lower base plate (22), wherein the upper base plate (21) is hinged to the lower end of the drill tube (1), and the lower base plate (22) is rotatably mounted on the lower end surface of the upper base plate (21), and a through hole 1 (211) and a through hole 2 (221) for feeding materials into the drill tube (1) are respectively formed on the upper base plate (21) and the lower base plate (22), wherein the device is characterized in that: Also includes: A plurality of arc-shaped telescopic plates (231), the plurality of telescopic plates (231) being arranged in the through hole (211) along the radial direction of the upper bottom plate (21), and the lengths of the plurality of telescopic plates (231) gradually increasing from the inside to the outside, the telescopic plates (231) being slidably mounted on the upper bottom plate (21) along the circumferential direction of the upper bottom plate (21), an elastic member (231) being arranged between the telescopic plates (231) and the upper bottom plate (21), when the drill tube (1) is full, the upper bottom plate (21) is reversed, so that the telescopic plates (231) block the through hole (221), and when there is a stone in the through hole (211), the telescopic plates (231) will compress the elastic member (231) after contacting the stone; A locking assembly is arranged on the upper base plate (21), and when the second through hole (221) is blocked, the upper base plate (21) and the lower base plate (22) are locked.

2. A pile foundation construction device according to claim 1, characterized in that: A rotating frame (232) and a driving assembly for driving the rotating frame (232) to rotate are rotatably mounted on the upper bottom plate (21); a plurality of arc-shaped telescopic plates (233) are arranged on the rotating frame (232) along the radial direction of the drill tube (1); and the plurality of telescopic plates (233) gradually increase in length from the inside to the outside; the telescopic plates (233) are slidably mounted on the rotating frame (232) along the circumferential direction of the drill tube (1); an elastic member (2) is arranged between the telescopic plates (233) and the upper bottom plate (21); when the second through hole (221) is opened, the telescopic plates (231) and the second telescopic plates (233) are respectively located at the front and rear sides of the second through hole (221); when the drill tube (1) is filled, the telescopic plates (231) and the second telescopic plates (233) on both sides of the second through hole (221) are close to each other, thereby blocking the second through hole (221).

3. A pile foundation construction device according to claim 2, characterized in that: The driving assembly comprises a gear (235) rotatably mounted on the lower base plate (22), a first gear ring (236) fixedly mounted on the upper base plate (21), and a second gear ring (237) fixedly mounted on the rotating frame (232), wherein the upper and lower sides of the gear (235) are respectively meshed with the first gear ring (236) and the second gear ring (237).

4. A pile foundation construction device according to claim 2, characterized in that: The ends of the telescopic plate 1 (231) and the telescopic plate 2 (233) that are close to each other are both provided with protrusions (234) for contacting with stones.

5. A pile foundation construction device according to claim 4, characterized in that: A vibration motor is arranged inside the protrusion (234) to make the protrusion (234) vibrate.

6. A pile foundation construction device according to claim 2, characterized in that: The inner arc surfaces of the telescopic plate 1 (231) and the telescopic plate 2 (233) are both provided with arc-shaped track grooves, and the outer arc surfaces of the telescopic plate 1 (231) and the telescopic plate 2 (233) are both provided with arc-shaped slide bars for cooperating with adjacent track grooves.

7. A pile foundation construction device according to claim 1, characterized in that: The locking assembly comprises a locking block (24) slidably mounted on the outer circumferential surface of the upper base plate (21) in a radial direction of the upper base plate (21) and a driving source 1 for driving the locking block (24) to move. When the second through hole (221) is blocked, the driving source 1 drives the locking block (24) to move outwards and abut against the lower base plate (22).

8. A pile foundation construction device according to claim 7, characterized in that: The driving source 1 comprises a lead screw 1 (25) arranged in the upper base plate (21) and a motor 1 whose output end is connected to the lead screw 1 (25); the lead screw 1 (25) is threadedly engaged with the locking block (24).

9. A pile foundation construction device according to claim 1, characterized in that: The locking mechanism (3) comprises a connecting hook (31) arranged on the upper base plate (21), a clamping block (32) slidably arranged on the drill tube (1) in a horizontal direction, and a driving source for driving the clamping block (32) to move. A groove for cooperating with the clamping block (32) is provided on the side surface of the connecting hook (31). When the upper base plate (21) and the drill tube (1) are coaxial, the clamping block (32) is clamped in the groove.

10. A pile foundation construction device according to claim 9, characterized in that: The second driving source comprises a second lead screw (33) arranged on the drill tube (1) and a second motor whose output end cooperates with the second lead screw (33); the second lead screw (33) is threadedly engaged with the clamping block (32).

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