Adjustable bored pile construction device

Abstract

The application discloses a kind of adjustable bored pile construction devices, including device main body, and the stable frame of fixed installation in device main body upper end, the shaft sleeve of stable frame one side surface sliding is connected, the main shaft and spring of one end fixed installation of shaft sleeve, the spring sleeve is set in the outside of main shaft, the spring is fixedly connected with the adjusting cylinder away from the one end of shaft sleeve, the main shaft is extended to the inside of adjusting cylinder and is fixedly connected with driven shaft away from the one end of shaft sleeve, the outside of main shaft end portion is connected with the inside of adjusting cylinder, the drive disc of driven shaft is fixedly installed away from the one end of main shaft;The application, by setting overload mechanism, can provide quick contraction space for drill bit, avoid the damage of drill bit, and transmit power to correction mechanism, so that the correction mechanism can quickly run to achieve the purpose of clamping and correcting main shaft and driven shaft, so as to achieve the effect of automatic correction, drill bit protection and cost saving.

Description

Technical Field

[0001] This invention relates to the field of cast-in-place pile construction equipment, and more particularly to an adjustable cast-in-place pile construction equipment. Background Technology

[0002] The cast-in-place pile construction device is a core piece of equipment for realizing the cast-in-place pile construction process, which is a specialized machine covering the entire process of hole formation, wall protection, steel cage installation, and concrete pouring.

[0003] During the construction of wind farms, cast-in-place piles are required to ensure the stability of the structures above. Before the construction of cast-in-place piles, it is necessary to drill holes, followed by wall protection, installation of steel cages, and concrete pouring. However, during drilling, due to the unknown underground conditions, the drill bit is prone to hitting hard rocks, which can cause the drill bit to deviate. Drill bit deviation can lead to holes that do not meet construction requirements, making construction impossible and requiring drilling again, resulting in a waste of manpower, material resources, and financial resources.

[0004] At the same time, when the drill bit encounters a hard rock and deviates, it will continue to drill downwards, which will lead to excessive wear on the drill bit and eventually damage it.

[0005] Therefore, we provide an adjustable cast-in-place pile construction device. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned technical problems by providing an adjustable cast-in-place pile construction device that achieves automatic correction, drill bit protection, and cost savings.

[0007] In view of this, the present invention provides an adjustable cast-in-place pile construction device, including a device body and a stabilizing frame fixedly installed on the upper end of the device body. A bushing is slidably connected to one side surface of the stabilizing frame. A main shaft and a spring are fixedly installed at one end of the bushing. The spring is sleeved on the outside of the main shaft. An adjusting cylinder is fixedly connected to the end of the spring away from the bushing. The end of the main shaft away from the bushing extends into the interior of the adjusting cylinder and is fixedly connected to a driven shaft. The outer side of the end of the main shaft is rotatably connected to the interior of the adjusting cylinder.

[0008] A drive disc is fixedly installed at the end of the driven shaft away from the main shaft. The drive disc has several sliding holes through it and several meshing grooves around its periphery.

[0009] An overload mechanism is movably connected to the outside of the driven shaft, and a protection mechanism is provided on the outside of the drive disc;

[0010] A correction mechanism is provided on the upper circumference of the driven shaft. The correction mechanism is located inside the adjusting cylinder, and a drill bit is inserted into one end of the adjusting cylinder.

[0011] The inner wall of the regulating cylinder is provided with several regulating grooves. The ends of the regulating grooves are fixedly connected to the opposite sides with a stabilizing short rod. An regulating spring is sleeved on the outside of the stabilizing short rod.

[0012] Preferably, the protection mechanism includes a connecting groove formed on one side of the drill bit, a timing disc fixedly installed on the inner wall of the connecting groove, a support block and a sliding rod fixedly installed on one side surface of the timing disc, one end of the sliding rod extending to the outside of the drill bit and fixedly connected to a connecting ring, and the outer side of the sliding rod slidingly engaging with the drill bit and the inside of the sliding hole.

[0013] Preferably, the overload mechanism includes a fixed ring, and a plurality of support chambers are fixedly installed on the outer side of the fixed ring. The inner wall of the support chamber has four symmetrically distributed limiting grooves. A spring is fixedly installed on the inner wall of the limiting groove. A limiting ball is fixedly installed on the end of the spring away from the inner wall of the limiting groove. A passive short rod and an active short rod are slidably connected to the upper end and lower end of the support chamber, respectively.

[0014] Preferably, the correction mechanism includes several pushing blocks, each pushing block having a pushing groove inside, and two symmetrically distributed limiting arc plates fixedly installed on one side of each pushing block, with connecting blocks fixedly installed at both opposite ends of each pushing block.

[0015] Preferably, two symmetrically distributed protrusions are fixedly installed on the inner wall of the pushing groove, and a pushing plate is slidably connected to the inner wall of the pushing groove. Two symmetrically distributed protrusions are fixedly installed on one side surface of the pushing plate.

[0016] Preferably, a plurality of the limiting arc plates are arranged in a cylindrical shape with their ends aligned, and the plurality of the limiting arc plates forming the cylindrical shape are sleeved with the outer end of the main shaft and the outer end of the driven shaft.

[0017] Preferably, the inside of the connecting block slides against the outside of the stabilizing short rod, and the end of the adjusting spring away from the inner wall of the adjusting groove is fixedly connected to one side surface of the connecting block.

[0018] Preferably, the end of the active short rod away from the inside of the support chamber is fixedly connected to the upper surface of the connecting ring, and the inner surface of the fixed ring is rotated to the outer side of the driven shaft.

[0019] Preferably, the inner wall of the meshing groove is slidably connected to one side surface of the support block, and the drive disc is disposed inside the connecting groove.

[0020] Preferably, the upper end of the passive short rod is fixedly connected to one end of the push plate, and the push block is disposed inside the adjustment groove.

[0021] Compared with the prior art, the present invention provides an adjustable cast-in-place pile construction device, which has the following beneficial effects:

[0022] This invention, by setting an overload mechanism, can provide space for rapid retraction of the drill bit, avoiding damage to the drill bit, and transmit power to the straightening mechanism, enabling the straightening mechanism to operate quickly to achieve the purpose of clamping and straightening the spindle and driven shaft, thereby achieving the effects of automatic straightening, drill bit protection, and cost saving.

[0023] This invention, by setting up a protective mechanism, can provide rotational power to the drill bit, ensuring stable operation of the drill bit, and at the same time, can provide accurate retraction guidance for the drill bit, thereby achieving the effects of protecting the drill bit and saving costs.

[0024] This invention, by setting up a correction mechanism, can promptly correct the deviation generated by the drill bit by clamping and correcting the spindle and driven shaft, thereby achieving the effect of automatic correction.

[0025] This invention, by setting a pushing block and a limiting arc plate, can accurately clamp the main shaft and the driven shaft. At the same time, it can adjust the clamping force on the main shaft and the driven shaft according to the magnitude of the extrusion force on the drill bit, thereby achieving stable operation and automatic correction.

[0026] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention has a simple structure and is easy to operate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of a drill bit in an adjustable cast-in-place pile construction device proposed in this invention.

[0029] Figure 3 This is a schematic diagram of the protective mechanism structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0030] Figure 4 This is a schematic diagram of the synchronization disc structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0031] Figure 5 This is a schematic diagram of the fixed ring structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0032] Figure 6 This is a schematic diagram of the drive disc structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0033] Figure 7 This is a schematic diagram of the connecting ring structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0034] Figure 8 This is an enlarged schematic diagram of section A of the adjustable cast-in-place pile construction device proposed in this invention;

[0035] Figure 9 This is a schematic diagram of the support chamber structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0036] Figure 10 This is a schematic diagram of the adjusting cylinder structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0037] Figure 11 This is an enlarged schematic diagram of section B of an adjustable cast-in-place pile construction device proposed in this invention;

[0038] Figure 12 This is a schematic diagram of the correction mechanism structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0039] Figure 13 This is a schematic diagram of the protrusion structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0040] Figure 14 This is an enlarged schematic diagram of the structure at point C of an adjustable cast-in-place pile construction device proposed in this invention;

[0041] Figure 15 This is a schematic diagram of the limiting arc plate structure of an adjustable cast-in-place pile construction device proposed in this invention;

[0042] Figure 16 This is a schematic diagram of the push plate structure of an adjustable cast-in-place pile construction device proposed in this invention.

[0043] In the diagram: 1. Main body of the device; 2. Stabilizer; 3. Bushing; 4. Drill bit; 5. Adjusting cylinder; 51. Adjusting groove; 52. Adjusting spring; 53. Stabilizing short rod; 6. Main shaft; 7. Spring; 8. Protection mechanism; 81. Synchronizing disc; 82. Support block; 83. Slide rod; 84. Connecting groove; 85. Connecting ring; 9. Overload mechanism; 91. Passive short rod; 92. Support chamber; 93. Active short rod; 94. Fixed ring; 95. Limiting groove; 96. Spring one; 97. Limiting ball; 10. Driven shaft; 101. Drive disc; 102. Engaging groove; 103. Sliding hole; 12. Correction mechanism; 121. Pushing block; 122. Limiting arc plate; 123. Connecting block; 124. Pushing groove; 125. Pushing plate; 126. Protrusion; 128. Protrusion one. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0045] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Example: An adjustable cast-in-place pile construction device, such as Figures 1-16 As shown, the device includes a main body 1 and a stabilizer 2 fixedly mounted on the upper end of the main body 1. The stabilizer 2 provides support and stability for the bushing 3, as well as allowing it to move. The bushing 3 is slidably attached to one side surface of the stabilizer 2. A main shaft 6 and a spring 7 are fixedly mounted on one end of the bushing 3. The spring 7 is sleeved on the outside of the main shaft 6. An adjusting cylinder 5 is fixedly connected to the end of the spring 7 away from the bushing 3. The end of the main shaft 6 away from the bushing 3 extends into the adjusting cylinder 5 and is fixedly connected to a driven shaft 10. The driven shaft 10 is connected to the main shaft 6. With the drive disc 101, synchronous power transmission can be achieved, and it also provides installation support for the overload mechanism 9. The outer side of the end of the main shaft 6 is connected to the inside of the adjusting cylinder 5. The drive disc 101 is fixedly installed on the driven shaft 10 away from the main shaft 6. The drive disc 101 is set inside the connecting groove 84. Several sliding holes 103 are opened through the inside of the drive disc 101. Several meshing grooves 102 are opened around the drive disc 101. The inner wall of the meshing groove 102 slides against one side surface of the support block 82.

[0047] An overload mechanism 9 is movably connected to the outside of the driven shaft 10. The overload mechanism 9 includes a fixed ring 94, the inner surface of which is rotatably connected to the outside of the driven shaft 10. Several support chambers 92 are fixedly installed on the outside of the fixed ring 94. Four symmetrically distributed limiting grooves 95 are opened on the inner wall of the support chambers 92. A spring 96 is fixedly installed on the inner wall of the limiting grooves 95. A limiting ball 97 is fixedly installed on the end of the spring 96 away from the inner wall of the limiting groove 95. A passive short rod 91 and an active short rod 93 are slidably connected to the upper and lower ends of the support chambers 92, respectively. The passive short rod 91 and the active short rod 93 are not connected at opposite ends, thus ensuring that there is space between them. Hydraulic oil is present. When the active short rod 93 is subjected to a large pushing force, the active short rod 93 can quickly squeeze the hydraulic oil, and the passive short rod 91 can move under the pressure of the hydraulic oil. Through the above settings, the normal rotation of the drill bit 4 can be supported, and the drill bit 4 can quickly retract when it encounters a stone or object to achieve a protective effect. Hydraulic oil is existing technology and will not be described in detail here. The upper end of the passive short rod 91 is fixedly connected to one end of the push plate 125, and the end of the active short rod 93 away from the inside of the support chamber 92 is fixedly connected to the upper surface of the connecting ring 85. A protective mechanism 8 is provided on the outside of the drive disc 101.

[0048] The protection mechanism 8 includes a connecting groove 84 on one side of the drill bit 4. A timing disc 81 is fixedly installed on the inner wall of the connecting groove 84. A support block 82 and a slide rod 83 are fixedly installed on one side surface of the timing disc 81. One end of the slide rod 83 extends to the outside of the drill bit 4 and is fixedly connected to a connecting ring 85. The outer side of the slide rod 83 slides in contact with the drill bit 4 and the inside of the sliding hole 103. A correction mechanism 12 is provided on the circumference of the upper half of the driven shaft 10. The correction mechanism 12 includes several pushing blocks 121. The pushing blocks 121 are located inside the adjustment groove 51. A pushing groove 124 is opened inside the pushing blocks 121. The pushing groove 124 is divided into two, located at opposite ends of the pushing blocks 121. Two symmetrically distributed protrusions 126 are fixedly installed on the inner wall of the pushing groove 124.

[0049] A push plate 125 is slidably connected to the inner wall of the push groove 124. Two symmetrically distributed protrusions 128 are fixedly installed on one side of the push plate 125. The protrusions 128 are located at opposite ends of the push plate 125, which can ensure that the synchronous push limiting arc plate 122 can clamp the driven shaft 10 and the main shaft 6 at the same time. Two symmetrically distributed limiting arc plates 122 are fixedly installed on one side of the push block 121. Several limiting arc plates 122 are arranged in a cylindrical shape with their ends corresponding to each other. The ends of the several limiting arc plates 122 are not connected and there is a certain space between them, which can ensure that the limiting arc plates 122 can clamp and correct the driven shaft 10 and the main shaft 6. Several limiting arc plates 122 arranged in a cylindrical shape are sleeved with the outer end of the main shaft 6 and the outer end of the driven shaft 10. Connecting blocks 123 are fixedly installed at opposite ends of the push block 121.

[0050] The connecting block 123 is slidably connected to the outside of the stabilizing short rod 53. The correction mechanism 12 is located inside the adjusting cylinder 5. A drill bit 4 is inserted into one end of the adjusting cylinder 5. The insertion method can ensure that there is enough space for the drill bit 4 to move. Several adjusting grooves 51 are opened on the inner wall of the adjusting cylinder 5. The stabilizing short rod 53 is fixedly connected to both sides of the end of the adjusting groove 51. An adjusting spring 52 is sleeved on the outside of the stabilizing short rod 53. When the drill bit 4 is reset, the adjusting spring 52 can support and push the long block 121 to reset. The end of the adjusting spring 52 away from the inner wall of the adjusting groove 51 is fixedly connected to one side surface of the connecting block 123.

[0051] Compared with existing technologies, the overload protection of existing cast-in-place pile construction equipment is mostly a single mechanical structure, such as using spring buffer or independent hydraulic overload protection system. Such methods have problems such as response lag, inability to balance support force and buffering, and the overload protection mechanism is not connected to the power transmission components, which can lead to power interruption or untimely protection. The present invention adopts an overload mechanism 9. Under normal conditions, the resistance of hydraulic oil and the pre-tightening force of spring 96 and limit ball 97 form a stable support to ensure the normal rotation and drilling of drill bit 4. When drill bit 4 is subjected to compression overload, active short rod 93 squeezes hydraulic oil, and the pressure is quickly transmitted to passive short rod 91, realizing the rapid contraction of drill bit 4, thereby achieving the effect of protecting drill bit 4. It can also transmit power to correction mechanism 12, thereby achieving the effect of automatic correction.

[0052] Existing drilling deviation correction methods for cast-in-place pile construction equipment are mostly independent adjustment mechanisms, such as manually adjusting the verticality of the drill rod. This type of correction cannot achieve automatic correction and protection during use. The correction mechanism 12 of this invention uses the cooperation of components such as push plate 125, protrusion 126, and protrusion 128 to enable multiple push blocks 121 to simultaneously drive the limiting arc plate 122 to clamp the main shaft 6 and the driven shaft 10, thereby ensuring that the correction force can be evenly distributed and avoiding the deviation caused by unilateral clamping, thus achieving the effect of automatic correction.

[0053] In existing cast-in-place pile construction equipment, the connection between the drill bit 4 and the power drive shaft is mostly a single rigid connection or a simple sliding connection. While rigid connections can ensure the efficiency and stability of power transmission, they lack extension and contraction space when overloaded, which can lead to the breakage of transmission components such as the drill bit 4. The protection mechanism 8 of this invention uses a combination of meshing groove 102 and sliding hole 103. The meshing groove 102 on the drive disc 101 slides with the support block 82 on the synchronous disc 81, thereby forming a limiting structure for power transmission and preventing relative torsion during transmission. The sliding hole 103 on the drive disc 101 slides with the sliding rod 83, which can provide a guiding effect for the displacement of the drill bit 4 and allow relative extension and contraction between the drill bit 4 and the drive disc 101 when overloaded, thereby achieving the effect of protecting the drill bit 4.

[0054] When the drill bit 4 collides with a rock or object, the correction mechanism 12 can stabilize the drill bit 4 and protect the main shaft 6 and driven shaft 10. The vibration generated by the collision can be felt by the operator of the pile construction device. At this time, by adjusting the rotation speed of the drill bit 4, the rock or object can be drilled at a slower speed or the drill bit 4 can be lifted and removed by other equipment before work can continue. This method is well known in the art and will not be described in detail here.

[0055] Working Principle: During hole drilling, the main body 1 drives the stabilizer 2, which moves the position of the bushing 3. Simultaneously, the hydraulic column on the main body 1 adjusts the angle of the stabilizer 2. At this time, the motor on the stabilizer 2 starts, rotating the main shaft 6 inside the bushing 3. The rotation of the main shaft 6 drives the driven shaft 10 inside the adjusting cylinder 5, causing the drive disc 101 on the driven shaft 10 to rotate. The rotation of the drive disc 101 rotates the support block 82, and the sliding rod 83 follows the rotation of the sliding hole 103. The rotation of the support block 82 and the sliding rod 83 drives the synchronous disc 81, which in turn drives the drill bit 4. The rotation of drill bit 4 enables hole forming. When drill bit 4 encounters a hard rock or other object during hole forming, the harder rock or other object cannot be broken by the rotation of drill bit 4. At this time, drill bit 4 is in rigid contact with the rock or other object, and the two generate opposing forces. At the same time, drill bit 4 is squeezed by the opposing force. When the rock or object is small, the opposing force is small. Drill bit 4 first transmits the opposing force to the support block 82 and slide rod 83 of synchronous disc 81. At this time, support block 82 can slide inside meshing groove 102, and slide rod 83 slides inside drill bit 4 and sliding hole 103. The sliding of slide rod 83 can push connecting ring 85 upward. At this time, connecting ring 85 can push active short rod 93. The active short rod 93 pushes the support chamber 92 inwards. Simultaneously, its upward movement pressurizes the hydraulic oil between the support chamber 92 and the active short rod 93, which in turn compresses the limiting ball 97. When the reaction force exceeds the supporting force of the spring 96, the limiting ball 97 is compressed into the limiting groove 95 by the active short rod 93. At this point, the active short rod 93 passes through the limiting ball 97 and continues to compress the hydraulic oil. Because the reaction force is relatively small, the hydraulic oil can support the continued movement of the active short rod 93. This, in turn, provides space for the drill bit 4 to move via the movement of the synchronizer disc 81, ensuring that the drill bit 4 stays away from rocks and objects, preventing further contact and damage. When the reaction force is large, the active short rod 93... The movement of the hydraulic rod generates significant pressure on the hydraulic oil. When the hydraulic oil is compressed to its limit, the passive short rod 91 is pushed by the hydraulic oil. Simultaneously, after the passive short rod 91 moves, the active short rod 93 continues to compress, ensuring the continued movement of the passive short rod 91. When the passive short rod 91 moves, the push plate 125 is pushed, sliding inside the push groove 124. Simultaneously, the protrusion 128 on the push plate 125 compresses the protrusion 126 inside the push groove 124. When the protrusion 126 is compressed, it drives the push block 121 to move. When the push block 121 moves, the connecting block 123 begins to slide on the adjusting groove 51 and compresses the adjusting spring 52.At this time, pushing the long block 121 causes the limiting arc plate 122 to move towards the center position of the driven shaft 10 and the main shaft 6, thereby enabling the limiting arc plate 122 to rigidly correct the driven shaft 10 and the main shaft 6 and resist the offset force, ensuring that the drill bit 4 will not deviate.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable cast-in-place pile construction device, comprising a device body (1) and a stabilizing frame (2) fixedly installed on the upper end of the device body (1), characterized in that, A bushing (3) is slidably attached to one side surface of the stabilizer (2). A main shaft (6) and a spring (7) are fixedly installed at one end of the bushing (3). The spring (7) is sleeved on the outside of the main shaft (6). An adjusting cylinder (5) is fixedly connected to the end of the spring (7) away from the bushing (3). The end of the main shaft (6) away from the bushing (3) extends into the interior of the adjusting cylinder (5) and is fixedly connected to a driven shaft (10). The outer side of the end of the main shaft (6) is rotatably connected to the interior of the adjusting cylinder (5). The driven shaft (10) is fixedly mounted with a drive disc (101) at one end away from the main shaft (6). The drive disc (101) has several sliding holes (103) through it and several meshing grooves (102) around it. The driven shaft (10) is movably connected to an overload mechanism (9), and a protection mechanism (8) is provided on the outside of the drive disc (101). The overload mechanism (9) includes a fixed ring (94), and several support chambers (92) are fixedly installed on the outside of the fixed ring (94). The upper and lower ends of the support chambers (92) are respectively slidably connected to a passive short rod (91) and an active short rod (93). A correction mechanism (12) is provided on the upper half of the driven shaft (10). The correction mechanism (12) is located inside the adjusting cylinder (5). A drill bit (4) is inserted into one end of the adjusting cylinder (5). The inner wall of the regulating cylinder (5) is provided with several regulating grooves (51). The ends of the regulating grooves (51) are fixedly connected to the opposite sides of the two sides with a stabilizing short rod (53). An regulating spring (52) is sleeved on the outside of the stabilizing short rod (53). The correction mechanism (12) includes several push blocks (121), the push blocks (121) have push grooves (124) inside, two symmetrically distributed limiting arc plates (122) are fixedly installed on one side of the push blocks (121), and connecting blocks (123) are fixedly installed on both opposite ends of the push blocks (121). Two symmetrically distributed protrusions (126) are fixedly installed on the inner wall of the push groove (124), and a push plate (125) is slidably connected to the inner wall of the push groove (124). Two symmetrically distributed protrusions (128) are fixedly installed on one side surface of the push plate (125). Several limiting arc plates (122) are arranged in a cylindrical shape with their ends aligned. The several limiting arc plates (122) that make up the cylindrical shape are sleeved with the outer end of the main shaft (6) and the outer end of the driven shaft (10). The inside of the connecting block (123) is slidably connected to the outside of the stabilizing short rod (53), and the end of the adjusting spring (52) away from the inner wall of the adjusting groove (51) is fixedly connected to one side surface of the connecting block (123). The upper end of the passive short rod (91) is fixedly connected to one end of the push plate (125), and the push block (121) is set inside the adjustment groove (51).

2. The adjustable cast-in-place pile construction device according to claim 1, characterized in that, The protective mechanism (8) includes a connecting groove (84) opened on one side of the drill bit (4). A timing disc (81) is fixedly installed on the inner wall of the connecting groove (84). A support block (82) and a slide rod (83) are fixedly installed on one side surface of the timing disc (81). One end of the slide rod (83) extends to the outside of the drill bit (4) and is fixedly connected to a connecting ring (85). The outside of the slide rod (83) slides in contact with the drill bit (4) and the inside of the sliding hole (103).

3. The adjustable cast-in-place pile construction device according to claim 1, characterized in that, The inner wall of the support chamber (92) is provided with four symmetrically distributed limiting grooves (95). A spring (96) is fixedly installed on the inner wall of the limiting groove (95). A limiting ball (97) is fixedly installed on the end of the spring (96) away from the inner wall of the limiting groove (95).

4. The adjustable cast-in-place pile construction device according to claim 2, characterized in that, One end of the active short rod (93) away from the inside of the support chamber (92) is fixedly connected to the upper surface of the connecting ring (85), and the inner surface of the fixed ring (94) is rotated to the outer side of the driven shaft (10).

5. An adjustable cast-in-place pile construction device according to claim 2, characterized in that, The inner wall of the meshing groove (102) slides against one side surface of the support block (82), and the drive disc (101) is disposed inside the connecting groove (84).

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