Angle measurement based on circular pipeline axis positioning with total station prism adapter and measuring method

Abstract

The application relates to the technical field of construction surveying equipment, in particular to a total station prism adapter for circular pipeline axis positioning based on angle measurement and a measuring method, which comprises a measuring mechanism, a support frame arranged on the outer side of the measuring mechanism and an angle measurement instrument, and the measuring mechanism is sequentially provided with a prism, an elongated rod, a rotating part, a connecting part and a ground insertion rod from top to bottom. The total station prism adapter for circular pipeline axis positioning based on angle measurement and the measuring method are used for the following steps: after initial pile foundation point position measurement is completed, a local coordinate system is established based on the bottom end origin of the ground insertion rod by using the angle measurement instrument, the azimuth angle and the inclination angle parameters are automatically output by using the Pythagorean theorem, the specific position of the pile foundation point is irradiated by a laser pen, the construction personnel do not need to frequently move the equipment in the excavated foundation pit for trial positioning, and the time for circular pipeline axis positioning before circular pipeline pre-burying is saved.

Description

Technical Field

[0001] This invention relates to the field of construction surveying equipment technology, and more specifically, to a total station prism adapter and measurement method for axial positioning of circular pipes based on angle measurement. Background Technology

[0002] The total station prism adapter is a key accessory for connecting the measuring prism of a total station. It is used to accurately center and stably fix the prism, ensuring that the prism is aligned with the instrument's optical axis during measurement, thus reducing human error. In circular pipe pre-embedding projects involving pile foundation construction, this adapter is an indispensable measuring tool to ensure accurate matching between the pipe's axial position, the pipe's installation position, and the pile position.

[0003] Patent application number CN202420310867.6 discloses an automatic tracking total station prism, including a mounting plate placed on the top of a tripod. A downwardly extending annular groove is formed in the center of the mounting plate, and a bracket fixed to the prism plate is rotatably connected to the annular groove. Both sides of the inner wall of the prism plate are connected to a rotating shaft through retaining rings. This can solve the technical problems of manual straightening, which cannot guarantee the verticality of the instrument itself, and the measurement error is relatively large. The prism structure is also relatively complicated in the replacement and assembly operations, which is not conducive to manual operation and reduces work efficiency.

[0004] However, existing equipment lacks automatic coordinate transformation and angle calculation functions. Due to the lack of automated calculation and insufficient mechanical coordination, construction workers need to repeatedly move the measuring mechanism in the foundation pit and compare the deviation of the pile center through multiple total station measurements. It is necessary to first measure the initial position, then manually estimate the direction of movement, and then reposition and remeasure to verify. This trial-and-error process that relies on manual estimation, repeated movement of equipment and verification results in long single-point positioning time. Construction workers frequently move in the narrow pit bottom, increasing the risk of slippage or equipment collision.

[0005] In view of this, we propose a total station prism adapter and measurement method for axial positioning of circular pipes based on angle measurement. Summary of the Invention

[0006] The purpose of this invention is to provide a total station prism adapter and measurement method for axial positioning of circular pipes based on angle measurement. By changing the driving direction of the motor, the rotating cylinder and laser pointer in the rotating part are driven in a time-division manner, so that the rotating cylinder and laser pointer can rotate at a specified azimuth angle and tilt angle respectively, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A total station prism adapter for axial positioning of a circular pipe based on angle measurement includes a measuring mechanism and a support frame and an angle measuring instrument disposed on its outer side. The measuring mechanism is provided with a prism, a long rod, a rotating part, a connecting part and a ground insertion rod from top to bottom.

[0009] The rotating part includes a rotating cylinder, a ratchet disposed on its bottom surface, a laser pointer rotating in a groove on the outside of the rotating cylinder, a gear sleeved on the outside of the convex shaft at the end of the laser pointer, a lifting frame disposed inside the rotating cylinder, and a pair of racks disposed on the top of the lifting frame; the lifting frame moves upward, and the racks mesh with the gear to drive the laser pointer to flip outward.

[0010] The connecting part includes a connecting pipe, a motor disposed on the bottom surface inside the connecting pipe, a circular pipe driven by the motor, a lead screw that rotates with the circular pipe, an insert rod disposed at the end of the lead screw, a sleeve sleeved on the outside of the insert rod, a disc disposed at the end of the sleeve, and a number of pawls disposed in the groove of the disc's annular wall and abutting against the ratchet.

[0011] The motor drives the round tube to rotate in the reverse direction, causing the lead screw and insert rod to rotate downwards together. After the sleeve and disc rotate in the reverse direction, the pawl abuts against the ratchet, causing the rotating cylinder to rotate. When the motor rotates in the forward direction, the lead screw rotates upwards, causing the insert rod to lift the disc and move the lifting frame upwards.

[0012] In the technical solution of the present invention, the prism is snapped and fixed to the end of the long rod, and the support frame and the angle measuring instrument are both fixedly connected to the outer wall of the long rod by bolts.

[0013] By using a support frame and a ground-inserting rod, a stable triangular structure is formed at the bottom of the prism, thus ensuring stability during prism measurement.

[0014] In the technical solution of the present invention, the rotating cylinder is rotatably connected to the bottom surface of the long rod via a rotating shaft at the top. The interior of the rotating cylinder is provided with a placement groove for the displacement of the lifting frame. The ratchet is engaged and fixed in the ring at the bottom of the rotating cylinder.

[0015] In the technical solution of the present invention, the laser pointer is rotatably connected to the inside of the groove on the outer wall of the rotating cylinder via a convex shaft at its end, and the convex shaft at its end extends into the inside of the rotating cylinder placement groove, and the gear is engaged and fixed to the outside of the convex shaft at the end of the laser pointer.

[0016] In the technical solution of the present invention, the lifting frame is slidably connected to the inside of the rotating cylinder placement groove, the rack is welded and fixed to the top surface of the lifting frame and meshes with the gear, and a spring is also attached to the top surface of the lifting frame. The top end of the spring is attached to the inner top surface of the rotating cylinder and its own elasticity pushes the lifting frame to move downward.

[0017] After the lifting frame is driven by the meshing of rack and pinion, the rotation angle of the laser pointer can be precisely controlled to ensure the accuracy of the laser pointer illuminating the pile foundation point.

[0018] In the technical solution of the present invention, the top end of the connecting pipe is rotatably connected to the outside of the bottom ring of the rotating cylinder, and its bottom end is snapped and fixed to the top end of the grounding rod. Several regularly distributed rings are welded and fixed inside the connecting pipe.

[0019] In the technical solution of the present invention, the motor is snapped and fixed to the inner bottom surface of the connecting pipe, the bottom end of the round pipe is coaxially connected to the output shaft of the motor, and a through groove is provided on the outer wall of the round pipe.

[0020] In the technical solution of the present invention, the lead screw is threadedly connected to the annular body located in the middle of the connecting pipe, the lead screw is sleeved inside the round pipe, and a protruding rod extending to the through groove of the pipe wall is integrally formed on the outer wall of the lead screw. The insertion rod is welded and fixed to the end of the lead screw.

[0021] In the technical solution of the present invention, the sleeve is sleeved on the outside of the insertion rod and rotatably connected to the inside of the top ring of the connecting tube, the disc is snapped and fixed to the top of the sleeve, the longitudinal section of the disc is inverted T-shaped, and the pawl is rotatably connected to the inside of the groove of the disc ring wall.

[0022] By changing the driving direction of the motor, the rotating cylinder and laser pointer in the rotating part are driven in a time-sharing manner, so that they can rotate at a specified azimuth angle and tilt angle respectively.

[0023] On the other hand, the present invention also provides a total station prism measurement method for locating the axis of a circular pipe based on angle measurement, using the above-mentioned total station prism adapter for locating the axis of a circular pipe based on angle measurement, including the following steps:

[0024] S1. First, after excavation at the pile foundation location, two construction workers operate a total station and a surveying mechanism. The total station is placed outside the excavated pit, and the coordinates of the position are measured first. Then, the construction worker holding the surveying mechanism moves to the excavated pit, places the surveying mechanism inside the pit, adjusts the prism position to align it with the total station, and then adjusts the support frame to ensure that the bubble in the horizontal bubble fixed on the outer wall of the long rod is in the center.

[0025] S2. Subsequently, the construction worker operating the total station aims the lens at the prism, measures the deviation of the prism's position from the center point of the pile foundation on the X and Y axes, and informs the construction worker in the foundation pit of the coordinate deviation value displayed by the total station, and inputs the difference between the X and Y axes into the angle measuring instrument.

[0026] S3. The angle measuring instrument takes the contact point at the bottom of the ground pole as the origin of the coordinate system and defines the orientation of the groove of the rotating cylinder as the positive direction of the Y-axis. It establishes a local rectangular coordinate system. Based on the known fixed height of the laser pointer tip, that is, the vertical distance from the laser pointer tip to the bottom of the ground pole, and combined with the input values, it calculates the azimuth angle that the rotating cylinder should rotate and the tilt angle of the laser pointer flip according to the Pythagorean theorem.

[0027] S4. After loosening the screw between the long rod and the rotating cylinder, the angle measuring instrument controls the motor in the connecting part to drive the round tube to rotate in the opposite direction. The protruding rod is moved through the through groove in the pipe wall, which in turn drives the screw to rotate in the opposite direction. The ring body located in the middle of the connecting tube spirals downward, and the sleeve is driven to rotate in the opposite direction through the insertion rod. Then, after several pawls on the outside of the disc abut against the ratchet, the rotating cylinder is driven to rotate towards the target coordinate position of the pile foundation.

[0028] S5. Next, control the rotation direction of the motor. The lead screw rotates clockwise and lifts axially. During this process, the outer pawl of the disc slides on the ratchet tooth surface to ensure that the rotating cylinder maintains the angle lock. When the insert rod rises to the top surface of the sleeve, the disc is driven to lift axially synchronously through the sleeve. The central convex column of the disc pushes the lifting frame to move vertically upward.

[0029] S6. During the upward movement of the lifting frame, its rack and gear mesh to drive the laser pointer to rotate outward with the end as the rotation center until the preset tilt angle calculated by the angle measuring instrument is reached. At this time, the crosshair projected by the laser pointer falls precisely at the center point of the pile foundation.

[0030] S7. After that, the construction worker in the foundation pit marks the center point of the crosshair, moves the surveying mechanism to the front of the marked point, inserts the ground rod into the bottom of the foundation pit, and then re-measures with the total station. The position of the surveying mechanism is directly controlled at the marked point for fine-tuning, and the final point is marked.

[0031] S8. Subsequently, the construction worker will move the equipment out of the foundation pit and direct the on-site construction personnel to hoist the circular pipe to be pre-buried onto the ground of the foundation pit, using the marked points as the center. After backfilling the soil on the outside, a pile driver will be erected above the circular pipe for subsequent pile driving operations.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. This method for axial positioning of circular pipes using a total station prism adapter and measurement method based on angle measurement establishes a local coordinate system based on the origin of the bottom of the grounding rod after the initial pile foundation point measurement is completed. The azimuth and tilt angle parameters are automatically output using the Pythagorean theorem, and the specific location of the pile foundation point is illuminated by a laser pointer. This eliminates the need for construction workers to frequently move equipment in the excavated foundation pit for trial and error positioning, saving time on axial positioning of the circular pipe before pre-embedding.

[0034] 2. This total station prism adapter and measurement method for axial positioning of circular pipes based on angle measurement changes the driving direction of the motor, thereby driving the rotating cylinder and laser pointer in the rotating part in a time-sharing manner. This allows the rotating cylinder and laser pointer to rotate at specified azimuth and tilt angles respectively. This time-sharing driving mechanism replaces a multi-motor system with the direction switching of a single motor, ensuring seamless switching to laser pointer adjustment after the rotating cylinder angle is locked. This simplifies equipment complexity, improves adjustment accuracy, and accelerates the positioning process of pile foundation points, ensuring rapid and accurate marking of the pile foundation center point. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the measuring mechanism in this invention;

[0037] Figure 3 This is a partial structural diagram of the measuring mechanism in this invention;

[0038] Figure 4 This is a cross-sectional schematic diagram of the rotating part in this invention;

[0039] Figure 5 This is a cross-sectional schematic diagram of the rotating cylinder in this invention;

[0040] Figure 6 This is a partial structural diagram of the rotating part in this invention;

[0041] Figure 7 This is a cross-sectional schematic diagram of the connecting part in this invention;

[0042] Figure 8 This is a cross-sectional schematic diagram of the connecting pipe in this invention;

[0043] Figure 9 This is a partial structural diagram of the connecting part in the present invention;

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Measuring mechanism; 110. Prism; 120. Long rod; 130. Rotating part; 131. Rotating cylinder; 132. Ratchet; 133. Laser pointer; 134. Gear; 135. Lifting frame; 136. Rack; 137. Spring; 140. Connecting part; 141. Connecting pipe; 1410. Ring body; 142. Motor; 143. Round tube; 1430. Through groove in pipe wall; 144. Lead screw; 1440. Protruding rod; 145. Insert rod; 146. Sleeve; 147. Disc; 148. Pawl; 150. Grounding rod;

[0046] 200. Support frame;

[0047] 300. Angle measuring instrument. Detailed Implementation

[0048] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] Please see Figures 1-3 As shown, this embodiment provides the following technical solution:

[0050] A total station prism adapter for axial positioning of a circular pipe based on angle measurement includes a measuring mechanism 100, a support frame 200 and an angle measuring instrument 300 disposed on its outer side. The measuring mechanism 100 is provided with a prism 110, a long rod 120, a rotating part 130, a connecting part 140 and a grounding rod 150 in sequence from top to bottom.

[0051] Specifically, the prism 110 is snapped and fixed to the end of the long rod 120, and the support frame 200 and the angle measuring instrument 300 are both fixed to the outer wall of the long rod 120 by bolts.

[0052] Furthermore, the long rod 120 is used to fix the prism 110 and provide a fixed base point for the angle measuring instrument 300. Through the support frame 200 and the ground rod 150, a stable triangular structure is formed at the bottom of the prism 110, thus ensuring the stability of the prism 110 during measurement.

[0053] Please see Figures 1-6 As shown, in this embodiment, the rotating part 130 includes a rotating cylinder 131, a ratchet 132 disposed on its bottom surface, a laser pointer 133 rotating in the groove on the outside of the rotating cylinder 131, a gear 134 sleeved on the outside of the end convex shaft of the laser pointer 133, a lifting frame 135 disposed inside the rotating cylinder 131, and a pair of racks 136 disposed on the top of the lifting frame 135. When the lifting frame 135 moves upward, the racks 136 mesh with the gears 134 to drive the laser pointer 133 to flip outward.

[0054] Specifically, the rotating cylinder 131 is rotatably connected to the bottom surface of the long rod 120 via a rotating shaft at the top. The interior of the rotating cylinder 131 is provided with a placement groove for the displacement of the lifting frame 135. The ratchet 132 is engaged and fixed in the ring at the bottom of the rotating cylinder 131.

[0055] Furthermore, the laser pointer 133 is rotatably connected to the inside of the groove on the outer wall of the rotating cylinder 131 via a convex shaft at its end, and the convex shaft at its end extends into the inside of the placement groove of the rotating cylinder 131, with the gear 134 engaging and fixed to the outside of the convex shaft at the end of the laser pointer 133.

[0056] Furthermore, the lifting frame 135 is slidably connected to the inside of the placement groove of the rotating cylinder 131, the rack 136 is welded and fixed to the top surface of the lifting frame 135 and meshes with the gear 134, and a spring 137 is also attached to the top surface of the lifting frame 135. The top end of the spring 137 is attached to the inner top surface of the rotating cylinder 131 and its own elasticity pushes the lifting frame 135 to move downward.

[0057] Furthermore, during the upward movement of the lifting frame 135, its rack 136 and gear 134 mesh and drive the laser pointer 133 to rotate outward with its end as the rotation center until it reaches the preset tilt angle calculated by the angle measuring instrument 300. At this time, the crosshair projected by the laser pointer falls precisely at the center point of the pile foundation, while the elastic force provided by the spring 137 pushes the lifting frame 135 downward, allowing the laser pointer 133 to reset. After the lifting frame 135 is driven by the meshing of the rack 136 and gear 134, the flip angle of the laser pointer 133 can be precisely controlled to ensure the accuracy of the laser pointer 133 illuminating the pile foundation point.

[0058] Please see Figures 1-9 As shown, in this embodiment, the connecting part 140 includes a connecting pipe 141, a motor 142 disposed on the bottom surface inside the connecting pipe 141, a circular pipe 143 driven by the motor 142, a lead screw 144 rotating with the circular pipe 143, an insert rod 145 disposed at the end of the lead screw 144, a sleeve 146 sleeved on the outside of the insert rod 145, a disc 147 disposed at the end of the sleeve 146, and a plurality of pawls 148 disposed in the groove of the annular wall of the disc 147 and abutting against the ratchet 132. The motor 142 drives the circular pipe 143 to rotate in the reverse direction, causing the lead screw 144 and the insert rod 145 to rotate downwards together. After the sleeve 146 and the disc 147 rotate in the reverse direction, the pawls 148 abut against the ratchet 132 and drive the rotating cylinder 131 to rotate. When the motor 142 rotates in the forward direction, the lead screw 144 rotates upwards in a spiral, causing the insert rod 145 to lift the disc 147 and drive the lifting frame 135 to move upwards.

[0059] Specifically, the top end of the connecting pipe 141 is rotatably connected to the outside of the bottom ring of the rotating cylinder 131, and its bottom end is snapped and fixed to the top end of the grounding rod 150. Several regularly distributed rings 1410 are welded and fixed inside the connecting pipe 141.

[0060] Furthermore, the motor 142 is snapped and fixed to the inner bottom surface of the connecting pipe 141, the bottom end of the round pipe 143 is coaxially connected to the output shaft of the motor 142, and a through groove 1430 is provided on the outer wall of the round pipe 143.

[0061] Furthermore, the lead screw 144 is threadedly connected to the ring 1410 located in the middle of the connecting pipe 141. The lead screw 144 is sleeved inside the round pipe 143. A protruding rod 1440 extending to the through groove 1430 of the pipe wall is integrally formed on the outer wall of the lead screw 144. The insertion rod 145 is welded and fixed to the end of the lead screw 144.

[0062] Furthermore, the sleeve 146 is fitted onto the outside of the insert rod 145 and rotatably connected to the inside of the top ring 1410 of the connecting tube 141. The disc 147 is snapped and fixed to the top of the sleeve 146. The longitudinal section of the disc 147 is inverted T-shaped. The pawl 148 is rotatably connected to the groove inside the annular wall of the disc 147.

[0063] Furthermore, the motor 142 in the control connection 140 drives the round tube 143 to rotate in the opposite direction, and through the through groove 1430 in the tube wall, it moves the protruding rod 1440, which in turn drives the lead screw 144 to rotate in the opposite direction. Then, the ring 1410 located in the middle of the connecting tube 141 spirals downward, and through the insertion rod 145, it drives the sleeve 146 to rotate in the opposite direction. Then, through the several pawls 148 on the outside of the disc 147, it abuts against the ratchet 132, and drives the rotating cylinder 131 to rotate toward the target coordinate position of the pile foundation.

[0064] Furthermore, by controlling the rotation direction of the motor 142, the lead screw 144 rotates clockwise and lifts axially. During this process, the pawl 148 on the outer side of the disc 147 slides on the tooth surface of the ratchet 132 to ensure that the rotating cylinder 131 maintains an angle lock. When the insert rod 145 rises to the inner top surface of the sleeve 146, the sleeve 146 drives the disc 147 to lift axially in sync. The central convex post of the disc 147 pushes the lifting frame 135 to move vertically upward. By changing the driving direction of the motor 142, the rotating cylinder 131 and the laser pointer 133 in the rotating part 130 are driven in a time-sharing manner, so that they can rotate at the specified azimuth angle and tilt angle respectively.

[0065] This invention also provides a total station prism measurement method for locating the axis of a circular pipe based on angle measurement, using the aforementioned total station prism adapter for locating the axis of a circular pipe based on angle measurement, including the following steps:

[0066] S1. First, after excavation at the pile foundation location, two construction workers operate a total station and a surveying mechanism 100. The total station is placed outside the excavated pit, and the coordinates of the position are measured first. Then, the construction worker holding the surveying mechanism 100 moves to the excavated pit, places the surveying mechanism 100 inside the pit, adjusts the position of the prism 110 to align it with the total station, and then adjusts the support frame 200 to ensure that the bubble in the horizontal bubble fixed on the outer wall of the long rod 120 is centered.

[0067] S2. Subsequently, the construction worker operating the total station aims the lens at the prism 110, measures the X-axis and Y-axis deviations of the position of the prism 110 relative to the center point of the pile foundation, and informs the construction worker in the foundation pit of the coordinate deviation values ​​displayed by the total station, and inputs the difference between the X-axis and Y-axis into the angle measuring instrument 300.

[0068] S3. Angle measuring instrument 300 establishes a local rectangular coordinate system with the bottom contact point of the grounding rod 150 as the origin of the coordinate system and the orientation of the groove of the rotating cylinder 131 as the positive direction of the Y-axis. Based on the known fixed height of the end of the laser pointer 133, that is, the vertical distance from the end of the laser pointer 133 to the bottom of the grounding rod 150, and combined with the input values, the azimuth angle that the rotating cylinder 131 should rotate and the tilt angle of the laser pointer 133 are calculated according to the Pythagorean theorem.

[0069] S4. After loosening the screw between the long rod 120 and the rotating cylinder 131, the angle measuring instrument 300 controls the motor 142 in the connecting part 140 to drive the round tube 143 to rotate in the opposite direction. The protruding rod 1440 is moved through the through groove 1430 of the tube wall, which in turn drives the lead screw 144 to rotate in the opposite direction. The ring 1410 located in the middle of the connecting tube 141 spirals downward. The sleeve 146 is driven to rotate in the opposite direction through the insert rod 145. Then, the ratchet 132 is abutted by several pawls 148 on the outside of the disc 147, which drive the rotating cylinder 131 to rotate toward the target coordinate position of the pile foundation.

[0070] S5. Next, control the rotation direction of motor 142, and screw 144 rotates clockwise and lifts axially. During this process, the outer pawl 148 of disc 147 slides on the tooth surface of ratchet 132 to ensure that rotating cylinder 131 maintains angle lock. When insert rod 145 rises to the inner top surface of sleeve 146, sleeve 146 drives disc 147 to lift axially in sync. The central convex column of disc 147 pushes lifting frame 135 to move vertically upward.

[0071] S6. During the upward movement of the lifting frame 135, its rack 136 and gear 134 mesh and drive the laser pointer 133 to rotate outward with the end as the rotation center until the preset tilt angle calculated by the angle measuring instrument 300 is reached. At this time, the crosshair projected by the laser pointer 133 falls precisely at the center point of the pile foundation.

[0072] S7. After that, the construction worker in the foundation pit marks the center point of the crosshair, moves the measuring mechanism 100 to the front of the marked point, inserts the ground rod 150 into the bottom of the foundation pit, and then re-measures with the total station. The worker directly controls the position of the measuring mechanism 100 at the marked point to make fine adjustments, and marks the final determined point.

[0073] S8. Subsequently, the construction worker will move the equipment out of the foundation pit and direct the on-site construction personnel to hoist the circular pipe to be pre-buried onto the ground of the foundation pit, using the marked points as the center. After backfilling the soil on the outside, a pile driver will be erected above the circular pipe for subsequent pile driving operations.

[0074] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A prism adapter for a total station used for axial positioning of a circular pipe based on angle measurement, comprising a measuring mechanism and a support frame and an angle measuring instrument disposed on its outer side, characterized in that: The measuring mechanism consists of a prism, a long rod, a rotating part, a connecting part, and a ground-inserting rod, from top to bottom. The rotating part includes a rotating cylinder, a ratchet disposed on its bottom surface, a laser pointer rotating in a groove on the outside of the rotating cylinder, a gear sleeved on the outside of the convex shaft at the end of the laser pointer, a lifting frame disposed inside the rotating cylinder, and a pair of racks disposed on the top of the lifting frame. When the lifting frame moves upward, the racks mesh with the gear to drive the laser pointer to flip outward. The connecting part includes a connecting pipe, a motor disposed on the bottom surface inside the connecting pipe, a circular pipe driven by the motor, a lead screw that rotates with the circular pipe, an insert rod disposed at the end of the lead screw, a sleeve sleeved on the outside of the insert rod, a disc disposed at the end of the sleeve, and several pawls disposed in the grooves of the disc's annular wall and abutting against the ratchet. The motor drives the circular pipe to rotate in the reverse direction, causing the lead screw and insert rod to rotate downwards in a spiral motion. After the sleeve and disc rotate in the reverse direction, the pawls abut against the ratchet, causing the rotating cylinder to rotate. When the motor rotates in the forward direction, the lead screw rotates upwards in a spiral motion, causing the insert rod to lift the disc and move the lifting frame upwards.

2. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 1, characterized in that: The prism is snapped and fixed to the end of the long rod, and the support frame and the angle measuring instrument are both fixed to the outer wall of the long rod by bolts.

3. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 2, characterized in that: The rotating cylinder is rotatably connected to the bottom surface of the long rod via a rotating shaft at the top. The interior of the rotating cylinder has a placement groove for the displacement of the lifting frame. The ratchet is engaged and fixed in the ring at the bottom of the rotating cylinder.

4. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 3, characterized in that: The laser pointer is rotatably connected to the inside of the groove on the outer wall of the rotating cylinder via a convex shaft at its end, and the convex shaft at its end extends into the inside of the rotating cylinder placement groove. The gear is engaged and fixed to the outside of the convex shaft at the end of the laser pointer.

5. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 4, characterized in that: The lifting frame is slidably connected to the inside of the rotating cylinder placement slot. The rack is welded and fixed to the top surface of the lifting frame and meshes with the gear. A spring is also attached to the top surface of the lifting frame. The top end of the spring is attached to the inner top surface of the rotating cylinder and its own elasticity pushes the lifting frame to move downward.

6. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 5, characterized in that: The top end of the connecting pipe is rotatably connected to the outside of the bottom ring of the rotating cylinder, and its bottom end is snapped and fixed to the top end of the ground rod. Several regularly distributed rings are welded and fixed inside the connecting pipe.

7. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 6, characterized in that: The motor is snapped and fixed to the inner bottom surface of the connecting pipe. The bottom end of the round pipe is coaxially connected to the output shaft of the motor. A through groove is provided on the outer wall of the round pipe.

8. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 7, characterized in that: The lead screw is threaded to the annular body located in the middle of the connecting pipe. The lead screw is sleeved inside the round pipe. A protruding rod extending to the through groove of the pipe wall is integrally formed on the outer wall of the lead screw. The insertion rod is welded and fixed to the end of the lead screw.

9. The total station prism adapter for axial positioning of a circular pipe based on angle measurement as described in claim 8, characterized in that: The sleeve is fitted onto the outside of the insert rod and rotatably connected to the inside of the top ring of the connecting tube. The disc is snapped and fixed to the top of the sleeve. The longitudinal section of the disc is inverted T-shaped. The pawl is rotatably connected to the groove inside the disc ring wall.

10. A total station prism measurement method for axial center positioning of a circular pipe based on angle measurement, using the total station prism adapter for axial center positioning of a circular pipe based on angle measurement as described in claim 9, characterized in that... Includes the following steps: S1. First, after excavation at the pile foundation location, two construction workers operate a total station and a surveying mechanism. The total station is placed outside the excavated pit, and the coordinates of the position are measured first. Then, the construction worker holding the surveying mechanism moves to the excavated pit, places the surveying mechanism inside the pit, adjusts the prism position to align it with the total station, and then adjusts the support frame to ensure that the bubble in the horizontal bubble fixed on the outer wall of the long rod is in the center. S2. Subsequently, the construction worker operating the total station aims the lens at the prism, measures the deviation of the prism's position from the center point of the pile foundation on the X and Y axes, and informs the construction worker in the foundation pit of the coordinate deviation value displayed by the total station, and inputs the difference between the X and Y axes into the angle measuring instrument. S3. The angle measuring instrument takes the contact point at the bottom of the ground pole as the origin of the coordinate system and defines the orientation of the groove of the rotating cylinder as the positive direction of the Y-axis. It establishes a local rectangular coordinate system. Based on the known fixed height of the laser pointer tip, that is, the vertical distance from the laser pointer tip to the bottom of the ground pole, and combined with the input values, it calculates the azimuth angle that the rotating cylinder should rotate and the tilt angle of the laser pointer flip according to the Pythagorean theorem. S4. After loosening the screw between the long rod and the rotating cylinder, the angle measuring instrument controls the motor in the connecting part to drive the round tube to rotate in the opposite direction. The protruding rod is moved through the through groove in the pipe wall, which in turn drives the screw to rotate in the opposite direction. The ring body located in the middle of the connecting tube spirals downward, and the sleeve is driven to rotate in the opposite direction through the insertion rod. Then, after several pawls on the outside of the disc abut against the ratchet, the rotating cylinder is driven to rotate towards the target coordinate position of the pile foundation. S5. Next, control the rotation direction of the motor. The lead screw rotates clockwise and lifts axially. During this process, the outer pawl of the disc slides on the ratchet tooth surface to ensure that the rotating cylinder maintains the angle lock. When the insert rod rises to the top surface of the sleeve, the disc is driven to lift axially synchronously through the sleeve. The central convex column of the disc pushes the lifting frame to move vertically upward. S6. During the upward movement of the lifting frame, its rack and gear mesh to drive the laser pointer to rotate outward with the end as the rotation center until the preset tilt angle calculated by the angle measuring instrument is reached. At this time, the crosshair projected by the laser pointer falls precisely at the center point of the pile foundation. S7. After that, the construction worker in the foundation pit marks the center point of the crosshair, moves the surveying mechanism to the front of the marked point, inserts the ground rod into the bottom of the foundation pit, and then re-measures with the total station. The position of the surveying mechanism is directly controlled at the marked point for fine-tuning, and the final point is marked. S8. Subsequently, the construction worker will move the equipment out of the foundation pit and direct the on-site construction personnel to hoist the circular pipe to be pre-buried onto the ground of the foundation pit, using the marked points as the center. After backfilling the soil on the outside, a pile driver will be erected above the circular pipe for subsequent pile driving operations.

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