Rotary drilling rig and method for screw steel pipe pile construction

Abstract

The application relates to the field of pipe pile construction and relates to a rotary drilling rig for spiral steel pipe pile construction, which comprises a drilling rig body, an angle correction device, a base comprising a fixed column, a supporting piece comprising a guide part guiding the moving direction of the spiral steel pipe pile, an adjusting mechanism for adjusting the angle formed by the guide part intersecting with the ground reference plane in the first direction, a limiting plate arranged at the side of the fixed column, a sliding block movably arranged in the fixed column, a connecting rod connecting the limiting plate and the sliding block, and a first electromagnet arranged opposite to the sliding block. The fixed column is distributed in a rectangular shape at the bottom of the base, the limiting plate moves along the radial direction of the fixed column, the sliding block reciprocally moves along the axial direction of the fixed column, the sliding block is provided with a permanent magnet, the first electromagnet generates magnetism after being electrified, the magnetism can attract or repel the permanent magnet, and the two ends of the connecting rod are hingedly connected with the surface of the sliding block and the surface of the limiting plate. The rotary drilling rig for spiral steel pipe pile construction can improve the construction efficiency.

Description

Technical Field

[0001] This application relates to the field of pipe pile construction, and in particular to rotary drilling rigs and methods for constructing spiral steel pipe piles. Background Technology

[0002] Currently, it is difficult to construct at an angle using general piling equipment, which results in the inability to achieve sufficient length of the diagonal bracing, low bearing capacity, and insufficient reaction force. This leads to excessive displacement in some cases, failing to meet design requirements.

[0003] Publication No. (CN112411528A) discloses a new type of spiral steel pipe pile and its construction technology. It discloses that the spiral steel pipe pile is constructed according to the angle required on the design and construction drawings. Maintaining the construction angle is a key point for the success or failure of the construction of the spiral steel pipe pile. Therefore, before driving it, it is necessary to process a fixing device for correcting the angle, namely an angle corrector. This device can be welded with steel bars on site. The range of the corrected angle can be determined according to the driving angle of the spiral steel pipe pile.

[0004] According to the aforementioned publicly available literature, an angle corrector that adapts to the construction angle needs to be fabricated on-site during construction, which greatly affects the construction efficiency. Therefore, it is necessary to design an angle corrector that can be reused and is easy to adjust for the construction angle in the rotary drilling rig used for spiral steel pipe pile construction to improve construction efficiency. Summary of the Invention

[0005] To improve construction efficiency, this application provides a rotary drilling rig for spiral steel pipe pile construction.

[0006] The rotary drilling rig for spiral steel pipe pile construction provided in this application includes:

[0007] The drilling rig body provides the rotational power for the spiral steel pipe pile to be driven into the ground;

[0008] Angle correction device is used to guide the direction in which the spiral steel pipe enters the ground;

[0009] Angle correction device, including:

[0010] The base includes several fixing posts for securing the base to the ground;

[0011] Support components, including guide parts for the direction of movement of the guide spiral steel pipe pile;

[0012] An adjustment mechanism is used to adjust the angle formed by the intersection of the guide section and the ground reference plane along the first direction;

[0013] A limiting plate is installed on the side of the fixed column;

[0014] The slider is movable within the fixed column;

[0015] Linkage rod connects the limit plate and the slider;

[0016] The first electromagnet is positioned opposite the slider;

[0017] The fixed posts are located at the bottom of the base in a rectangular pattern, and the limiting plate moves along the radial direction of the fixed posts; the slider moves back and forth along the axial direction of the fixed posts, and the slider has a permanent magnet; the magnetism generated by the first electromagnet after being energized can attract / repel the permanent magnet; the two ends of the connecting rod are respectively hinged to the surface of the slider and the surface of the limiting plate.

[0018] The adjustment mechanism allows for adjustment of the angle formed by the intersection of the guide section with the ground reference plane along the first direction. This means that the adjustment mechanism facilitates convenient adjustment of the construction angle. The fixed column ensures the base is firmly fixed to the ground, allowing for quick relocation and repeated use whenever needed, eliminating the need for on-site fabrication. Furthermore, the limiting plate enhances the tightness between the fixed column and the soil, further improving the base's stability and ensuring sufficient strength to support the helical pipe pile.

[0019] Optionally, there are several limiting plates, evenly distributed along the circumference of the fixing posts; the fixing posts form guide grooves for guiding the radial movement of the limiting plates.

[0020] The limiting plate and the guide groove are connected by an elastic element;

[0021] The elastic element provides a pulling force to keep the limiting plate close to the first electromagnet.

[0022] Optionally, the angle correction device also includes: a screw, which is threadedly connected to the base;

[0023] The sprocket is rotatably mounted on the base.

[0024] Connector, connecting screw and sprocket;

[0025] Torque sensor is used to detect the torque when the screw rotates;

[0026] The screw is coaxially and fixedly connected to the fixed column; the torque sensor is electrically connected to the central processing unit; the central processing unit is used to receive and process the electrical signal transmitted by the torque sensor; the central processing unit is electrically connected to the first electromagnet to control the first electromagnet to be energized / de-energized.

[0027] Optionally, the connector includes:

[0028] Planetary gears are housed within the base to connect the sprocket and the helical rod;

[0029] The transmission rod is mounted on the planetary gears;

[0030] A flexible ball is mounted on the sprocket;

[0031] The end face of the screw away from the fixed post forms a connecting groove corresponding to the transmission rod; the cross-section of the transmission rod is an arbitrary geometric shape that is not circular; the elastic ball is movably connected to the planetary gear and provides the planetary gear with an upper limit in the circumferential direction.

[0032] Optionally, the fixing post forms a cavity for accommodating the first electromagnet;

[0033] The end of the transmission rod has a movable rod;

[0034] A sensor is installed at one end of the moving rod that is inserted into the cavity;

[0035] The cavity, located on the side of the first electromagnet, has a switch corresponding to the sensor; the switch is used to control the first electromagnet to be energized / de-energized.

[0036] Optionally, several sprockets are connected in series by a chain;

[0037] A drive motor is mounted on the base, and the output shaft of the drive motor is fixed to a sprocket that meshes with the chain.

[0038] A drill bit is installed at the end of the fixed column.

[0039] Optionally, the adjustment mechanism includes:

[0040] A rotating shaft is located on both sides of the support member;

[0041] A limit block is provided on the rotating shaft;

[0042] The second electromagnet is located inside the rotating shaft;

[0043] The base has a rotating groove corresponding to the rotating shaft; inside the rotating groove are several limiting grooves corresponding to the limiting blocks.

[0044] Optionally, a groove corresponding to the limiting block is formed on the surface of the rotating shaft;

[0045] A magnetically conductive metal sheet is provided at the bottom of the chute;

[0046] A magnet is placed on the surface of the limiting block near the metal sheet.

[0047] Optionally, an electronic angle gauge is installed on the support; a motor for driving the corresponding rotation axis is installed on the base;

[0048] The electronic angle gauge is electrically connected to the motor to control the motor's start and stop.

[0049] Furthermore, the method for constructing spiral steel pipe piles includes the following steps:

[0050] S1. Before construction, the points where the spiral steel pipe piles need to be driven are accurately located by surveying and setting out. Then, the spiral steel pipe piles are driven according to the angle required on the design drawings. Therefore, before driving them, the angle corrector needs to be moved to the positioning point and the angle corrector is set up.

[0051] S2. Start the motor, and the fixed column will start to rotate under the drive of the sprocket; then drive it vertically into the ground to fix the base to the ground surface;

[0052] Under the monitoring of the torque sensor, each fixed column can be limited under different soil conditions, making it widely applicable. After the base is fixed, the support is rotated, and the electronic angle gauge can monitor the construction angle α in real time. When the construction angle α reaches the predetermined value, the second electromagnet is energized, causing the limiting block to insert into the limiting groove for fixation. At this time, the angle corrector is installed. The adaptability of the angle corrector allows for reuse, saving the time required for on-site fabrication of angle correctors in the past. Furthermore, it allows for quick correction and reinforcement during driving by adjusting the construction angle.

[0053] S3. First, place the lower polygonal section of the spiral steel pipe pile on the support and connect it to the fixed drive shaft of the rotating power head. Drive it into the ground using an angle corrector, stopping drilling at 1.2m from the ground. Then, align the lower end of the middle polygonal steel pipe with the polygonal inner sleeve at the upper end of the lower polygonal steel pipe and fix it. After fixing, insert the fixed drive shaft into the upper end of the middle polygonal steel pipe and fix it. Continue drilling, stopping again at 1.2m from the ground. Disconnect the fixed drive shaft from the middle polygonal steel pipe. Align the lower end of the upper polygonal steel pipe with the polygonal inner sleeve at the upper end of the middle polygonal steel pipe and fix it. After fixing, insert the fixed drive shaft into the upper end of the upper polygonal steel pipe and fix it. Continue drilling until it is completely driven into the ground. Finally, release the fixed drive shaft from the upper polygonal steel pipe and proceed with the driving of the next spiral steel pipe pile.

[0054] In summary, the beneficial effect of this application is that the rotary drilling rig for spiral steel pipe pile construction has been redesigned during the construction process, and the angle correction device that can be reused and is easy to adjust the construction angle has been improved to increase the construction efficiency. Attached Figure Description

[0055] Figure 1 This is a schematic diagram illustrating the construction principle of an embodiment of this application;

[0056] Figure 2 This is a schematic diagram of the angle correction device according to an embodiment of this application;

[0057] Figure 3 This is a schematic diagram of the chain and sprocket according to an embodiment of this application;

[0058] Figure 4 This is a schematic diagram of the connector mounting structure according to an embodiment of this application;

[0059] Figure 5 This is a schematic diagram of the interior of the cavity according to an embodiment of this application;

[0060] Figure 6 This is a schematic diagram of the transmission rod according to an embodiment of this application;

[0061] Figure 7 This is a schematic diagram of the elastic beads and hollow cells according to an embodiment of this application;

[0062] Figure 8 This is a schematic diagram of the construction angle according to an embodiment of this application;

[0063] Figure 9 This is a schematic diagram of the support member and adjustment mechanism according to an embodiment of this application;

[0064] Figure 10 This is a schematic diagram of the adjustment mechanism according to an embodiment of this application;

[0065] Figure 11 This is a schematic diagram of the limiting groove according to an embodiment of this application.

[0066] Reference numerals: 100, spiral steel pipe pile; 102, angle correction device; 1, base; 2, support; 3, adjusting mechanism; 4, limiting plate; 5, slider; 6, connecting rod; 7, first electromagnet; 8, fixed column; 9, guide part; L, first direction; 11, reference plane; 13, cavity; 14, fixed shaft; 15, screw; 16, sprocket; 17, connector; 19, chain; 20, motor; 21, drill bit; 22, planetary gear; 23, transmission rod; 24, elastic ball; 26, slot; 27, moving rod; 28, sensor; 29, switch; 30, rotating shaft; 31, limiting block; 32, second electromagnet; 33, rotating groove; 34, limiting groove; 36, metal sheet; 37, magnet. Detailed Implementation

[0067] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0068] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0069] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0070] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0071] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0072] Example 1: This application discloses a rotary drilling rig for spiral steel pipe pile construction, including: a drilling rig body and an angle correction device 102; the lower section of the spiral steel pipe pile 100 is connected to the fixed transmission shaft of the rotating power head and placed on the angle correction device 102; the construction angle is adjusted by the angle corrector and the pile is driven into the ground; wherein, the angle correction device 102 includes: a base 1, a support 2, an adjustment mechanism 3, a limiting plate 4, a slider 5, a connecting rod 6, and a first electromagnet 7; specifically, the base 1 is constructed of a metal plate or a metal rod; at least four holes for driving the pile are provided at the bottom of the base 1. A fixed column 8 below the ground surface is used to fix the base 1 to the ground; a support member 2 for supporting the steel pipe pile is provided on the base 1, the support member 2 is rotatably mounted on the base 1, and forms a guide part 9 for guiding the movement of the steel pipe pile; more specifically, the guide part 9 forms a first direction L for the movement of the steel pipe pile; with the ground as the reference plane 11, the extension direction of the first direction L intersects the ground reference plane 11 and the angle formed is defined as the construction angle α; an adjustment mechanism 3 for adjusting the construction angle α is provided on the base 1; through the above scheme, the construction angle of the steel pipe pile can be adjusted before construction, thus improving accuracy;

[0073] Specifically, the fixing posts 8 are located at the bottom of the base 1 in a rectangular arrangement. Driving the fixing posts 8 into the ground strengthens the stability of the base 1 and improves stability during pile driving. Specifically, there are several limiting plates 4, evenly distributed along the circumference. The limiting plates 4 are movable along the diameter of the fixing posts 8. More specifically, the fixing posts 8 form guide grooves for guiding the radial movement of the limiting plates 4. The limiting plates 4 and the guide grooves are connected by an elastic element, a spring, which provides tension to the limiting plates 4, ensuring they remain close to the central axis of the fixing posts 8. Thus, under the action of the elastic element, the limiting plates 4 are initially positioned within the guide grooves, with their surface flush with the surface of the fixing posts 8. This ensures smooth driving of the piles into the ground.

[0074] The fixed column 8 is also equipped with a slider 5 and a first electromagnet 7. Specifically, a cavity 13 is formed inside the fixed column 8 to accommodate the slider 5 and the first electromagnet 7. The cavity 13 is connected to the guide groove. A fixed shaft 14 coaxial with the fixed column 8 is formed inside the cavity 13. The slider 5 is movably sleeved on the fixed shaft 14. The first electromagnet 7 is arranged opposite to the slider 5 inside the cavity 13. The slider 5 has a permanent magnet 37. The magnetic field generated by the first electromagnet 7 after being energized can attract / repel the permanent magnet 37. The two ends of the connecting rod 6 are respectively hinged to the surface of the slider 5 and the surface of the limiting plate 4. In the initial state, the length of the connecting rod 6 is greater than the closest distance between the slider 5 and the limiting plate 4 formed during the movement. With the above configuration, the magnetism generated by the first electromagnet 7 after being energized can attract the slider 5 to move. During the movement, as the slider 5 moves, the straight distance between it and the limiting plate 4 becomes smaller and smaller. Under the action of the connecting rod 6, it can resist the limiting plate 4, move along the guide groove, and insert into the soil, thus improving the fastening of the fixed column 8.

[0075] In another feasible implementation, the angle correction device 102 further includes: a screw 15, a sprocket 16, a connector 17, and a torque sensor; specifically, the screw 15 is threadedly connected to the base 1, and the screw 15 is preferably a trapezoidal threaded rod; it can maintain stability under harsh conditions such as construction sites; a sprocket 16 corresponding to the fixed pile is rotatably mounted on the base 1, and the sprocket 16 is coaxially connected to the fixed column 8 through the connector 17; the screw 15 and the fixed column 8 are fixedly connected by welding or casting, which can effectively improve strength; several sprockets 16 are connected by a chain 19, and a drive motor 20 is mounted on the base 1, the output shaft of which is fixed to the sprockets 16 meshing with the chain 19; wherein, a drill bit 21 is mounted at the end of the fixed column; through the above configuration, the start of the drive motor 20 can synchronously drive the sprockets 16 to rotate; thereby ensuring that several fixed columns 8 are driven into the ground simultaneously.

[0076] Specifically, a torque sensor is installed on connector 17; the torque sensor is electrically connected to a central processing unit (CPU); the CPU receives and processes the electrical signal transmitted by the torque sensor; the CPU is electrically connected to the first electromagnet 7 to control the energization / de-energization of the first electromagnet 7; with the above configuration, when the fixing post 8 is driven into the ground, if it encounters a harder soil layer, the fixing post 8 experiences increased resistance, and the torque sensor detects that the torque required to be transmitted by connector 17 has increased; after information analysis and processing, the CPU drives the first electromagnet 7 to be energized, causing the limiting plate 4 to insert into the soil layer; at this time, the fixing post 8 is fixed in the soil layer, improving the adaptability of fixing post 8.

[0077] More specifically, connector 17 includes: planetary gear 22, transmission rod 23, and elastic ball 24; wherein, planetary gear 22 is disposed on base 1 between sprocket 16 and screw 15 to coaxially connect sprocket 16 and screw 15; specifically, the end face of screw 15 away from fixed post 8 forms a connecting groove corresponding to transmission rod 23, and the cross-section of transmission rod 23 is any non-circular geometric shape; in this embodiment, a hexagon is used as an example; the depth of the connecting groove is at least the same as the length of fixed post 8; after transmission rod 23 is inserted into limiting groove 34, when transmission rod 23 rotates, it can drive screw 15 to rotate synchronously; since screw 15 is threadedly connected to base 1, screw 15 can drive fixed post 8 into the ground while rotating;

[0078] The planetary gear 22 has a rotating groove on its surface corresponding to the sprocket 16; the inner wall of the rotating groove has a slot 26 corresponding to the elastic ball 24; the elastic ball 24 is elastically connected to the sprocket 16, and the elastic ball 24 is partially embedded in the slot 26; when the sprocket 16 rotates, the planetary gear 22 can be driven to rotate by the resistance between the elastic ball 24 and the inner wall of the slot 26; with the above configuration, the rotational torque required by the planetary gear 22 increases, and the elastic ball 24 can disengage from the slot 26; at this time, the sprocket 16 can no longer drive the planetary gear 22 to rotate.

[0079] Specifically, a movable rod 27 is provided at the end of the transmission rod 23, and a sensor 28 is provided at the end of the movable rod 27; the sensor 28 can be a commercially available mechanical sensor 28; wherein, an embedded groove corresponding to the movable rod 27 is formed inside the fixed shaft 14; the depth of the embedded groove is at least the same as the length of the fixed column 8; a switch 29 is provided on the inner wall of the embedded groove and on the side of the first electromagnet 7; the switch 29 can control the first electromagnet 37 to be energized / de-energized after sensing the sensor 28; with the above scheme, when the fixed column 8 is driven into the ground surface, the sensor 28 moves closer to the switch 29; when the fixed column 8 is fully driven into the ground surface, the sensor 28 corresponds to the switch 29; at this time, the first electromagnet 7 is energized and can drive the limiting plate 4 to move and insert into the soil, completely fixing the base 1; thus improving the stability during construction.

[0080] In another more specific embodiment, the adjustment mechanism 3 includes: a rotating shaft 30, a limiting block 31, and a second electromagnet 32; specifically, the rotating shaft 30 is fixedly disposed on both sides of the support member 2; the fixing method can be integral welding or threaded bolt connection; a rotating groove 33 corresponding to the rotating shaft 30 is formed on the base 1; after the rotating shaft 30 is inserted into the rotating groove 33, it can rotate at any angle along the central axis of the rotating shaft 30; wherein, the limiting block 31 is movably disposed on the side wall of the rotating shaft 30; the inner wall of the rotating groove 33 forms a limiting groove 34 corresponding to the limiting block 31; when the limiting block 31 is embedded in the limiting groove 34, it can provide circumferential limitation for the rotating shaft 30; the number of limiting grooves 34 is greater than the number of limiting blocks 31, and they are evenly distributed along the circumferential direction of the rotating groove 33; thus, the limiting block 31 can be embedded in the limiting groove 34 at different angles to achieve limitation.

[0081] Specifically, a second electromagnet 32 ​​is installed inside the rotating shaft 30; a groove corresponding to the limiting block 31 is formed on the surface of the rotating shaft 30; a magnetically conductive metal sheet 36 is installed at the bottom of the groove, and a magnet 37 is installed on the surface of the limiting block 31 near the metal sheet 36; the magnet 37 can generate a repulsive magnetic field with the energized second electromagnet; with this arrangement, when the limiting is not needed, the magnetism of the magnet 37 can attract the metal sheet 36, so that the limiting block 31 is always located in the groove; when the second electromagnet 32 ​​is energized, the magnetism generated is greater than the magnetism of the mutual attraction between the magnet 37 and the metal sheet 36;

[0082] Among them, an electronic angle meter is installed on the motor 20 and the support member 2; the electronic angle meter can detect the value of the construction angle α in real time; the electronic angle meter is electrically connected to the central processing unit, and when the central processing unit determines that the construction angle α has reached the specified value, it transmits an electrical signal to the central processing unit; then the central processing unit controls the second electromagnet 32 ​​to be energized; at this time, the limiting block 31 moves under the action of the magnetic field and inserts into the limiting groove 34.

[0083] Example 2: A method for constructing spiral steel pipe piles, comprising the following steps:

[0084] S1. Before construction, the points where the spiral steel pipe pile 100 needs to be driven are accurately located by surveying and setting out. Then, the spiral steel pipe pile 100 is constructed according to the angle required on the design and construction drawings. Therefore, before driving it, the angle corrector needs to be moved to the positioning point and the angle corrector is set up.

[0085] S2. Start motor 20, and fixed column 8 begins to rotate under the drive of sprocket 16; then it is driven vertically into the ground to fix base 1 to the ground surface; under the monitoring of torque sensor, each fixed column 8 can be limited under different soil conditions, with a wide range of applications; after base 1 is fixed, rotate support 2, and electronic angle instrument can monitor construction angle α in real time; when construction angle α reaches the predetermined value, second electromagnet 32 ​​is energized to make limit block 31 insert into limit groove 34 to achieve fixation; at this time, angle corrector is installed; the present invention can achieve reuse through the adaptability of angle corrector, saving the time of traditional on-site fabrication of angle corrector; and can quickly remedy and reinforce by adjusting construction angle during driving;

[0086] S3. First, place the lower polygonal steel pipe section of the spiral steel pipe pile 100 on the two support pieces and connect it to the fixed drive shaft of the rotating power head; drive it into the ground using the angle corrector, and stop drilling at a distance of 1.2m from the ground; then, align the lower end of the middle polygonal steel pipe with the polygonal inner sleeve at the upper end of the lower polygonal steel pipe, and fix it. After fixing, insert the fixed drive shaft into the upper end of the middle polygonal steel pipe and fix it. Continue drilling after fixing, and stop drilling again at a distance of 1.2m from the ground; detach the fixed drive shaft from the middle polygonal steel pipe, align the lower end of the upper polygonal steel pipe with the polygonal inner sleeve at the upper end of the middle polygonal steel pipe and fix it. After fixing, insert the fixed drive shaft into the upper end of the upper polygonal steel pipe and fix it. Continue drilling after fixing until it is completely driven into the ground. Finally, release the fixation between the fixed drive shaft and the upper polygonal steel pipe to drive the next spiral steel pipe pile 100.

[0087] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0088] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A rotary drilling rig for spiral steel pipe pile construction, comprising: a rig body giving a rotary power to drive the spiral steel pipe pile into the ground; an angle correction device for guiding the direction of the spiral steel pipe into the ground; characterized in that the angle correction device comprises: a base comprising a plurality of fixing columns for fixing the base to the ground; a support comprising a guide for guiding the moving direction of the spiral steel pipe pile; an adjusting mechanism for adjusting the angle formed by the guide and the ground reference plane along the moving direction; a limiting plate arranged on the side of the fixing column; a sliding block movably arranged in the fixing column; a connecting rod connecting the limiting plate and the sliding block; a first electromagnet arranged opposite to the sliding block; wherein the fixing columns are arranged in a rectangular distribution at the bottom of the base, the limiting plate moves along the radial direction of the fixing column, the sliding block reciprocally moves along the axial direction of the fixing column, and the sliding block is provided with a permanent magnet, the first electromagnet generates a magnetic force to attract or repel the permanent magnet when powered, and the two ends of the connecting rod are hingedly connected to the surface of the sliding block and the surface of the limiting plate, respectively.

2. The rotary drilling rig for spiral steel pipe pile construction according to claim 1, characterized in that: the limiting plate has a plurality of limiting plates uniformly distributed along the circumferential direction of the fixing column; the fixing column forms a guide groove for guiding the radial movement of the limiting plate; the limiting plate and the guide groove are connected by an elastic member; wherein the elastic member gives the limiting plate a pulling force to always approach the first electromagnet.

3. The rotary drilling rig for spiral steel pipe pile construction according to claim 2, characterized in that: the angle correction device further comprises: a screw rod threadedly connected to the base; a sprocket rotatably arranged on the base; a connector connecting the screw rod and the sprocket; a torque sensor for detecting the torque when the screw rod rotates; wherein the screw rod is coaxially fixedly connected to the fixing column, the torque sensor is electrically connected to a central processing unit, the central processing unit is used to receive and process the electrical signal transmitted by the torque sensor, and the central processing unit is electrically connected to the first electromagnet to control the power-on / off of the first electromagnet.

4. The rotary drilling rig for spiral steel pipe pile construction according to claim 3, characterized in that: the connector comprises: a planetary gear arranged in the base to connect the sprocket and the screw rod; a transmission rod arranged on the planetary gear; an elastic ball arranged on the sprocket; wherein the end surface of the screw rod away from the fixing column forms a connecting groove corresponding to the transmission rod, the cross section of the transmission rod is any non-circular geometric shape, the elastic ball is movably connected to the planetary gear, and the elastic ball gives the planetary gear a limit in the circumferential direction.

5. The rotary drilling rig for spiral steel pipe pile construction according to claim 4, characterized in that: the fixing column forms a cavity for accommodating the first electromagnet; the end of the transmission rod has a moving rod; the end of the moving rod inserted into the fixing column is provided with an inductor. The fixed column has a switch corresponding to the inductor at the side of the first electromagnet.

6. The rotary drilling rig for spiral steel pipe pile construction according to claim 4, characterized in that: The sprocket has a plurality of sprocket teeth; A plurality of sprockets are connected by a chain; The base is provided with a driving motor, and the output shaft of the driving motor is fixed with a sprocket engaged with the chain; The end of the fixed column is provided with a drill bit.

7. The rotary drilling rig for spiral steel pipe pile construction according to claim 1, characterized in that: The adjusting mechanism comprises: A rotating shaft is arranged on the two side walls of the support; A limiting block is arranged on the rotating shaft; A second electromagnet is arranged in the rotating shaft; The base is provided with a rotating groove corresponding to the rotating shaft; and a plurality of limiting grooves corresponding to the limiting blocks are formed in the rotating groove.

8. The rotary drilling rig for spiral steel pipe pile construction according to claim 7, characterized in that: The surface of the rotating shaft is provided with a sliding groove corresponding to the limiting block; The bottom of the sliding groove is provided with a metal sheet with magnetic conductivity; The surface of the limiting block close to the metal sheet is provided with a magnet.

9. The rotary drilling rig for spiral steel pipe pile construction according to claim 7, characterized in that: The support is provided with an electronic angle gauge; The base is provided with a motor for driving the rotating shaft; The electronic angle gauge is electrically connected with the motor to control the opening and closing of the motor.

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